/* ==========================================================================
   SITE DESIGN SYSTEM — editorial redesign (serif/mono, soft-shadow cards)
   Navbar rules are preserved unchanged from the previous design; every other
   component below has been re-skinned to the new design tokens.
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* --- Core surface / ink tokens --- */
    --bg: #f6f5f9;
    --bg-wash-1: #ece7f6;
    --bg-wash-2: #fdf6ec;
    --surface: #ffffff;
    --surface-2: #fbfaff;
    --ink: #1b1730;
    --ink-soft: #625c7a;
    --ink-faint: #9a93b3;
    --accent: #4c3575;
    --accent-2: #6c53a3;
    --accent-soft: #ede8f7;
    --gold: #b8873b;
    --gold-soft: #f8efdd;
    --line: #e4e1ec;
    --good: #2f9e58;
    --good-soft: #e6f4ea;
    --bad: #d64545;
    --bad-soft: #fbe9e9;

    --shadow-sm: 0 1px 2px rgba(27, 23, 48, 0.05), 0 1px 1px rgba(27, 23, 48, 0.04);
    --shadow-md: 0 8px 24px -8px rgba(27, 23, 48, 0.14), 0 2px 8px -2px rgba(27, 23, 48, 0.06);
    --shadow-lg: 0 24px 60px -20px rgba(27, 23, 48, 0.22), 0 4px 16px -4px rgba(27, 23, 48, 0.08);

    --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
    --sans: "Avenir Next", Avenir, "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

    /* --- A1 six-topic palette (editorial retint) --- */
    --color-nom: #c65d6c;      --color-nom-bg: #f7e9eb;
    --color-acc: #3b82c4;      --color-acc-bg: #e7eff8;
    --color-irr: #c98a2c;      --color-irr-bg: #faf1e1;
    --color-coo: #7e57c2;      --color-coo-bg: #efeaf9;
    --color-sub: #1aa6b7;      --color-sub-bg: #e5f6f8;
    --color-neg: #5b8c3d;      --color-neg-bg: #eef3e6;

    /* --- C1/C2 eight-topic palette (editorial retint) --- */
    --color-c1-konj: #6c63ff;  --color-c1-konj-bg: #ecebff;
    --color-c1-part: #1aa6b7;  --color-c1-part-bg: #e5f6f8;
    --color-c1-pass: #c98a2c;  --color-c1-pass-bg: #faf1e1;
    --color-c1-verb: #b23a8e;  --color-c1-verb-bg: #f7e9f2;
    --color-c1-stil: #d1495b;  --color-c1-stil-bg: #fbeaec;
    --color-c1-modal: #748c3d; --color-c1-modal-bg: #eef3e2;
    --color-c1-satz: #7e57c2;  --color-c1-satz-bg: #efeaf9;
    --color-c1-attr: #5b6478;  --color-c1-attr-bg: #eaecf0;

    /* --- A2 seven-topic palette (new grammar tier: Perfekt, Modal, Two-Way
       Prepositions, Reflexive, Comparative, Superlative, Plural) --- */
    --color-a2-perfekt: #b5642f;     --color-a2-perfekt-bg: #faf0e8;
    --color-a2-modal: #a8862a;       --color-a2-modal-bg: #f8f2e0;
    --color-a2-twoway: #3f9e63;      --color-a2-twoway-bg: #e7f6ec;
    --color-a2-reflexive: #2aa38a;   --color-a2-reflexive-bg: #e3f6f1;
    --color-a2-comparative: #9c4fb3; --color-a2-comparative-bg: #f6ecf9;
    --color-a2-superlative: #a8477a; --color-a2-superlative-bg: #f9ecf3;
    --color-a2-plural: #3a6f8a;      --color-a2-plural-bg: #e8f0f4;

    /* --- B1 eight-topic palette (reference-only for now: Dative Case, Genitive
       Case, Separable Verbs, Non-Separable Verbs, Nominalization, Imperfect/
       Präteritum, Imperative, Future I) --- */
    --color-b1-dative: #4a6fa5;        --color-b1-dative-bg: #e9eef6;
    --color-b1-genitive: #8f4a6f;      --color-b1-genitive-bg: #f5eaf0;
    --color-b1-separable: #2f8a9c;     --color-b1-separable-bg: #e7f6f9;
    --color-b1-inseparable: #2f4a6b;   --color-b1-inseparable-bg: #e9eff6;
    --color-b1-nominalization: #8a6a9c; --color-b1-nominalization-bg: #f1ecf4;
    --color-b1-imperfect: #7a3d2f;     --color-b1-imperfect-bg: #f7ebe8;
    --color-b1-imperative: #a8452f;    --color-b1-imperative-bg: #f9eae6;
    --color-b1-futur1: #2f7d6b;        --color-b1-futur1-bg: #e8f7f4;

    /* --- B2 seven-topic palette (reference-only for now: Passive Voice,
       Subjunctive II, Dative Prepositions, Genitive Prepositions,
       Plusquamperfekt, Relative Clauses, Modal Particles) --- */
    --color-b2-passive: #5c5c9c;        --color-b2-passive-bg: #ebebf4;
    --color-b2-subjunctive2: #6b3d8a;   --color-b2-subjunctive2-bg: #f1e9f6;
    --color-b2-dativeprep: #6b8fb5;     --color-b2-dativeprep-bg: #eaf0f6;
    --color-b2-genitiveprep: #6b2f45;   --color-b2-genitiveprep-bg: #f6e9ee;
    --color-b2-plusquamperfekt: #5a6b2f; --color-b2-plusquamperfekt-bg: #f3f6e9;
    --color-b2-relative: #8a4a1f;       --color-b2-relative-bg: #faeee5;
    --color-b2-particles: #2f6b4a;      --color-b2-particles-bg: #e9f6ef;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #141220;
        --bg-wash-1: #1c1830;
        --bg-wash-2: #201a26;
        --surface: #1d1a2b;
        --surface-2: #211d30;
        --ink: #ede9f5;
        --ink-soft: #a79fc2;
        --ink-faint: #766e94;
        --accent: #ab9be6;
        --accent-2: #8f7dcf;
        --accent-soft: rgba(171, 155, 230, 0.14);
        --gold: #dcae6d;
        --gold-soft: rgba(220, 174, 109, 0.14);
        --line: #322c47;
        --good: #6bc98a;
        --good-soft: rgba(107, 201, 138, 0.14);
        --bad: #e58080;
        --bad-soft: rgba(229, 128, 128, 0.14);
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.5), 0 2px 8px -2px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.6), 0 4px 16px -4px rgba(0, 0, 0, 0.35);

        --color-nom: #d98a94;      --color-nom-bg: rgba(217, 138, 148, 0.16);
        --color-acc: #7db3e6;      --color-acc-bg: rgba(125, 179, 230, 0.16);
        --color-irr: #e3ab5c;      --color-irr-bg: rgba(227, 171, 92, 0.16);
        --color-coo: #b39ce0;      --color-coo-bg: rgba(179, 156, 224, 0.16);
        --color-sub: #5fd3e3;      --color-sub-bg: rgba(95, 211, 227, 0.16);
        --color-neg: #93c172;      --color-neg-bg: rgba(147, 193, 114, 0.16);

        --color-c1-konj: #a29bff; --color-c1-konj-bg: rgba(162, 155, 255, 0.16);
        --color-c1-part: #5fd3e3; --color-c1-part-bg: rgba(95, 211, 227, 0.16);
        --color-c1-pass: #e3ab5c; --color-c1-pass-bg: rgba(227, 171, 92, 0.16);
        --color-c1-verb: #dd7ec0; --color-c1-verb-bg: rgba(221, 126, 192, 0.16);
        --color-c1-stil: #ea8f9b; --color-c1-stil-bg: rgba(234, 143, 155, 0.16);
        --color-c1-modal: #a9c17a; --color-c1-modal-bg: rgba(169, 193, 122, 0.16);
        --color-c1-satz: #b39ce0; --color-c1-satz-bg: rgba(179, 156, 224, 0.16);
        --color-c1-attr: #9099ac; --color-c1-attr-bg: rgba(144, 153, 172, 0.16);

        --color-a2-perfekt: #e0946a;     --color-a2-perfekt-bg: rgba(224, 148, 106, 0.16);
        --color-a2-modal: #d4b25c;       --color-a2-modal-bg: rgba(212, 178, 92, 0.16);
        --color-a2-twoway: #6cc98e;      --color-a2-twoway-bg: rgba(108, 201, 142, 0.16);
        --color-a2-reflexive: #5cc9ae;   --color-a2-reflexive-bg: rgba(92, 201, 174, 0.16);
        --color-a2-comparative: #c98ada; --color-a2-comparative-bg: rgba(201, 138, 218, 0.16);
        --color-a2-superlative: #d488ae; --color-a2-superlative-bg: rgba(212, 136, 174, 0.16);
        --color-a2-plural: #6bb3d6;      --color-a2-plural-bg: rgba(107, 179, 214, 0.16);

        --color-b1-dative: #80a0d0;         --color-b1-dative-bg: rgba(128, 160, 208, 0.16);
        --color-b1-genitive: #c476a0;       --color-b1-genitive-bg: rgba(196, 118, 160, 0.16);
        --color-b1-separable: #55c1d7;      --color-b1-separable-bg: rgba(85, 193, 215, 0.16);
        --color-b1-inseparable: #4378b8;    --color-b1-inseparable-bg: rgba(67, 120, 184, 0.16);
        --color-b1-nominalization: #b99dc8; --color-b1-nominalization-bg: rgba(185, 157, 200, 0.16);
        --color-b1-imperfect: #c55d45;      --color-b1-imperfect-bg: rgba(197, 93, 69, 0.16);
        --color-b1-imperative: #dc735c;     --color-b1-imperative-bg: rgba(220, 115, 92, 0.16);
        --color-b1-futur1: #46c7a9;         --color-b1-futur1-bg: rgba(70, 199, 169, 0.16);

        --color-b2-passive: #9191c8;         --color-b2-passive-bg: rgba(145, 145, 200, 0.16);
        --color-b2-subjunctive2: #9e62c6;    --color-b2-subjunctive2-bg: rgba(158, 98, 198, 0.16);
        --color-b2-dativeprep: #93b2d2;      --color-b2-dativeprep-bg: rgba(147, 178, 210, 0.16);
        --color-b2-genitiveprep: #b8436e;    --color-b2-genitiveprep-bg: rgba(184, 67, 110, 0.16);
        --color-b2-plusquamperfekt: #97b843; --color-b2-plusquamperfekt-bg: rgba(151, 184, 67, 0.16);
        --color-b2-relative: #dc742e;        --color-b2-relative-bg: rgba(220, 116, 46, 0.16);
        --color-b2-particles: #43b878;       --color-b2-particles-bg: rgba(67, 184, 120, 0.16);
    }
}

html, body {
    margin: 0; padding: 0;
    background-color: var(--bg);
    color: var(--ink);
    min-height: 100vh; width: 100%;
    display: flex; flex-direction: column;
    overflow-x: hidden; overflow-y: auto !important;
    font-family: var(--sans);
    -webkit-font-smoothing: antialiased;
}

.app-layout {
    display: grid !important;
    grid-template-columns: minmax(240px, 280px) 1fr minmax(240px, 280px);
    gap: 20px;
    padding: 24px;
    width: 100%;
    max-width: 1360px;
    margin: 0 auto;
    /* Fixed to one viewport tall (minus the 64px navbar) instead of auto-growing —
       this is what lets the sidebars and .scroll-feed's own height:100%/overflow
       rules below actually take effect: each column scrolls internally within a
       fixed-height frame instead of the whole page scrolling as one long column. */
    height: calc(100vh - 64px) !important;
    overflow: hidden !important;
    box-sizing: border-box;
    background:
        radial-gradient(1100px 480px at 12% -10%, var(--bg-wash-1), transparent 60%),
        radial-gradient(900px 420px at 100% 0%, var(--bg-wash-2), transparent 55%);
}
.app-layout h2 {
    font-family: var(--serif);
    color: var(--ink);
    font-size: 1.15rem;
    font-weight: 500;
    letter-spacing: 0;
    margin-bottom: 16px;
    text-transform: none;
}

/* ==========================================================================
   NAVBAR — artifact style (serif wordmark, pill links, hairline border)
   ========================================================================== */
.navbar {
    background: var(--surface);
    padding: 0 40px;
    height: 64px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--line);
    width: 100%;
    z-index: 1000;
}

.brand-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: none;
    color: var(--ink);
    border: none;
    border-radius: 0;
    padding: 0;
    font-family: var(--serif);
    font-style: italic;
    font-size: 1.3rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    text-transform: none;
    box-shadow: none;
    cursor: pointer;
    user-select: none;
    transition: color 0.15s ease;
    flex-shrink: 0;
}
.brand-box:hover { color: var(--accent); transform: none; box-shadow: none; background: none; }
.brand-box:active { transform: none; box-shadow: none; }
.brand-logo { height: 32px; width: auto; display: block; }

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    height: 100%;
    gap: 4px;
    margin-right: 175px;
}
@media (max-width: 1100px) {
    .nav-links { margin-right: 0px; }
}

.nav-links a,
.dropdown-trigger {
    text-decoration: none;
    color: var(--ink-soft);
    font-size: 0.86rem;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: 999px;
    transition: background-color 0.15s ease, color 0.15s ease;
    cursor: pointer;
}
.nav-links a:hover,
.dropdown-trigger:hover { background-color: var(--accent-soft); color: var(--accent); }

.dropdown-item { position: relative; display: inline-block; padding-bottom: 12px !important; margin-bottom: -12px !important; }
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--surface);
    min-width: 170px;
    box-shadow: var(--shadow-md);
    padding: 8px 0;
    border-radius: 14px;
    border: 1px solid var(--line);
    margin-top: 8px !important;
}
.dropdown-menu a { display: block; padding: 8px 16px; font-size: 0.85rem; font-weight: 600; color: var(--ink-soft); border-radius: 0; }
.dropdown-menu a:hover { background-color: var(--accent-soft); color: var(--accent); }
.dropdown-item:hover .dropdown-menu { display: block; }

.dropdown-trigger.lang-pill-active {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 6px !important;
    background: var(--accent-soft) !important;
    color: var(--accent) !important;
    border: 1px solid transparent !important;
    border-radius: 999px !important;
    padding: 7px 14px !important;
    font-size: 0.78rem !important;
    font-weight: 700 !important;
    text-transform: none !important;
    letter-spacing: 0 !important;
    box-shadow: none !important;
    cursor: pointer !important;
    user-select: none !important;
    transition: background-color 0.15s ease, color 0.15s ease !important;
}
.dropdown-trigger.lang-pill-active:hover {
    transform: none !important;
    box-shadow: none !important;
    background: var(--accent) !important;
    color: #ffffff !important;
}
.dropdown-trigger.lang-pill-active:active { transform: none !important; }
/* ==========================================================================
   END NAVBAR
   ========================================================================== */

/* ==========================================================================
   LEFT SIDEBAR — grammar topic list
   ========================================================================== */
.sidebar-panel-left {
    height: 100%;
    overflow-y: auto;
    background-color: var(--surface);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 22px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.sidebar-left h2 {
    width: 100%; min-width: 0;
    font-family: var(--mono);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--gold);
    margin-bottom: 4px;
    text-transform: uppercase;
    text-align: center;
}
.sidebar-left h3 {
    font-family: var(--serif);
    color: var(--ink);
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 6px;
    text-align: left;
}
.sidebar-left > p {
    font-size: 0.8rem;
    color: var(--ink-soft);
    line-height: 1.5;
    margin: 0 0 16px;
}

.topic-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; width: 100%; }

.topic {
    display: flex;
    flex-direction: column;
    padding: 11px 14px;
    border-radius: 14px;
    cursor: default;
    text-decoration: none;
    position: relative;
    border: none;
    box-shadow: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.topic:hover { transform: translateX(2px); box-shadow: var(--shadow-sm); }
.topic:active { transform: translateX(1px); }

.topic strong { font-size: 0.85rem; font-weight: 700; text-shadow: none; }
.topic .subtitle { font-size: 0.7rem; margin-top: 1px; font-weight: 500; opacity: 0.75; }

.topic.active-sync { transform: translateX(2px); box-shadow: var(--shadow-md); }

.topic-color-1 { background: var(--color-nom-bg) !important; } .topic-color-1 strong { color: var(--color-nom) !important; }
.topic-color-2 { background: var(--color-acc-bg) !important; } .topic-color-2 strong { color: var(--color-acc) !important; }
.topic-color-3 { background: var(--color-irr-bg) !important; } .topic-color-3 strong { color: var(--color-irr) !important; }
.topic-color-4 { background: var(--color-coo-bg) !important; } .topic-color-4 strong { color: var(--color-coo) !important; }
.topic-color-5 { background: var(--color-sub-bg) !important; } .topic-color-5 strong { color: var(--color-sub) !important; }
.topic-color-6 { background: var(--color-neg-bg) !important; } .topic-color-6 strong { color: var(--color-neg) !important; }

.topic-color-c1-1 { background: var(--color-c1-konj-bg) !important; } .topic-color-c1-1 strong { color: var(--color-c1-konj) !important; }
.topic-color-c1-2 { background: var(--color-c1-part-bg) !important; } .topic-color-c1-2 strong { color: var(--color-c1-part) !important; }
.topic-color-c1-3 { background: var(--color-c1-pass-bg) !important; } .topic-color-c1-3 strong { color: var(--color-c1-pass) !important; }
.topic-color-c1-4 { background: var(--color-c1-verb-bg) !important; } .topic-color-c1-4 strong { color: var(--color-c1-verb) !important; }
.topic-color-c1-5 { background: var(--color-c1-stil-bg) !important; } .topic-color-c1-5 strong { color: var(--color-c1-stil) !important; }
.topic-color-c1-6 { background: var(--color-c1-modal-bg) !important; } .topic-color-c1-6 strong { color: var(--color-c1-modal) !important; }
.topic-color-c1-7 { background: var(--color-c1-satz-bg) !important; } .topic-color-c1-7 strong { color: var(--color-c1-satz) !important; }
.topic-color-c1-8 { background: var(--color-c1-attr-bg) !important; } .topic-color-c1-8 strong { color: var(--color-c1-attr) !important; }

.topic-color-a2-1 { background: var(--color-a2-perfekt-bg) !important; } .topic-color-a2-1 strong { color: var(--color-a2-perfekt) !important; }
.topic-color-a2-2 { background: var(--color-a2-modal-bg) !important; } .topic-color-a2-2 strong { color: var(--color-a2-modal) !important; }
.topic-color-a2-3 { background: var(--color-a2-twoway-bg) !important; } .topic-color-a2-3 strong { color: var(--color-a2-twoway) !important; }
.topic-color-a2-4 { background: var(--color-a2-reflexive-bg) !important; } .topic-color-a2-4 strong { color: var(--color-a2-reflexive) !important; }
.topic-color-a2-5 { background: var(--color-a2-comparative-bg) !important; } .topic-color-a2-5 strong { color: var(--color-a2-comparative) !important; }
.topic-color-a2-6 { background: var(--color-a2-superlative-bg) !important; } .topic-color-a2-6 strong { color: var(--color-a2-superlative) !important; }
.topic-color-a2-7 { background: var(--color-a2-plural-bg) !important; } .topic-color-a2-7 strong { color: var(--color-a2-plural) !important; }

/* ==========================================================================
   CENTER COLUMN — story cards, quiz cards, inline highlights
   ========================================================================== */
.center-content {
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    justify-content: flex-start !important;
    gap: 20px !important;
}

.scroll-feed { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 20px; }

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 30px 32px;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.card-badge {
    position: absolute;
    top: 18px;
    right: 18px;
    font-family: var(--mono);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 5px 10px;
    border-radius: 999px;
    text-transform: uppercase;
    border: none;
    background: var(--accent-soft);
    color: var(--accent);
}
.card-badge.level { background-color: var(--accent-soft); color: var(--accent); }
.card-badge.query { background-color: var(--gold-soft); color: var(--gold); position: relative; top: auto; right: auto; display: inline-block; flex-shrink: 0; }

.card h3, .card h4 {
    font-family: var(--serif);
    color: var(--ink);
    font-weight: 500;
    margin-bottom: 14px;
    text-wrap: balance;
}

.lesson-text {
    font-family: var(--serif);
    font-size: 1.2rem;
    line-height: 1.85;
    color: var(--ink);
    max-width: 68ch;
}
.lesson-text strong {
    font-weight: 700;
    text-decoration: underline;
    text-decoration-color: var(--gold);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
    cursor: pointer;
}

/* --- Inline Text Grammar Highlights --- */
.hl-base { display: inline-block; padding: 1px 7px; border-radius: 6px; font-weight: 600; transition: all 0.2s ease; cursor: default; }
.hl-base[data-topic="nominative"] { background-color: var(--color-nom-bg); color: var(--color-nom); }
.hl-base[data-topic="accusative"] { background-color: var(--color-acc-bg); color: var(--color-acc); }
.hl-base[data-topic="irregular"] { background-color: var(--color-irr-bg); color: var(--color-irr); }
.hl-base[data-topic="coordinating"] { background-color: var(--color-coo-bg); color: var(--color-coo); }
.hl-base[data-topic="subordinating"] { background-color: var(--color-sub-bg); color: var(--color-sub); }
.hl-base[data-topic="negation"] { background-color: var(--color-neg-bg); color: var(--color-neg); }

.hl-base.active { transform: scale(1.06); }
.hl-base.active[data-topic="nominative"] { background-color: var(--color-nom); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="accusative"] { background-color: var(--color-acc); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="irregular"] { background-color: var(--color-irr); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="coordinating"] { background-color: var(--color-coo); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="subordinating"] { background-color: var(--color-sub); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="negation"] { background-color: var(--color-neg); color: #ffffff; box-shadow: var(--shadow-sm); }

/* --- A2 seven-topic story highlights --- */
.hl-base[data-topic="perfekt"] { background-color: var(--color-a2-perfekt-bg); color: var(--color-a2-perfekt); }
.hl-base[data-topic="modal"] { background-color: var(--color-a2-modal-bg); color: var(--color-a2-modal); }
.hl-base[data-topic="twoway"] { background-color: var(--color-a2-twoway-bg); color: var(--color-a2-twoway); }
.hl-base[data-topic="reflexive"] { background-color: var(--color-a2-reflexive-bg); color: var(--color-a2-reflexive); }
.hl-base[data-topic="comparative"] { background-color: var(--color-a2-comparative-bg); color: var(--color-a2-comparative); }
.hl-base[data-topic="superlative"] { background-color: var(--color-a2-superlative-bg); color: var(--color-a2-superlative); }
.hl-base[data-topic="plural"] { background-color: var(--color-a2-plural-bg); color: var(--color-a2-plural); }

.hl-base.active[data-topic="perfekt"] { background-color: var(--color-a2-perfekt); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="modal"] { background-color: var(--color-a2-modal); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="twoway"] { background-color: var(--color-a2-twoway); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="reflexive"] { background-color: var(--color-a2-reflexive); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="comparative"] { background-color: var(--color-a2-comparative); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="superlative"] { background-color: var(--color-a2-superlative); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="plural"] { background-color: var(--color-a2-plural); color: #ffffff; box-shadow: var(--shadow-sm); }

/* --- B1 eight-topic story highlights --- */
.hl-base[data-topic="dative"] { background-color: var(--color-b1-dative-bg); color: var(--color-b1-dative); }
.hl-base[data-topic="genitive"] { background-color: var(--color-b1-genitive-bg); color: var(--color-b1-genitive); }
.hl-base[data-topic="separable"] { background-color: var(--color-b1-separable-bg); color: var(--color-b1-separable); }
.hl-base[data-topic="inseparable"] { background-color: var(--color-b1-inseparable-bg); color: var(--color-b1-inseparable); }
.hl-base[data-topic="nominalization"] { background-color: var(--color-b1-nominalization-bg); color: var(--color-b1-nominalization); }
.hl-base[data-topic="imperfect"] { background-color: var(--color-b1-imperfect-bg); color: var(--color-b1-imperfect); }
.hl-base[data-topic="imperative"] { background-color: var(--color-b1-imperative-bg); color: var(--color-b1-imperative); }
.hl-base[data-topic="futur1"] { background-color: var(--color-b1-futur1-bg); color: var(--color-b1-futur1); }

.hl-base.active[data-topic="dative"] { background-color: var(--color-b1-dative); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="genitive"] { background-color: var(--color-b1-genitive); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="separable"] { background-color: var(--color-b1-separable); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="inseparable"] { background-color: var(--color-b1-inseparable); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="nominalization"] { background-color: var(--color-b1-nominalization); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="imperfect"] { background-color: var(--color-b1-imperfect); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="imperative"] { background-color: var(--color-b1-imperative); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="futur1"] { background-color: var(--color-b1-futur1); color: #ffffff; box-shadow: var(--shadow-sm); }

/* --- B2 seven-topic story highlights --- */
.hl-base[data-topic="passive"] { background-color: var(--color-b2-passive-bg); color: var(--color-b2-passive); }
.hl-base[data-topic="subjunctive2"] { background-color: var(--color-b2-subjunctive2-bg); color: var(--color-b2-subjunctive2); }
.hl-base[data-topic="dativeprep"] { background-color: var(--color-b2-dativeprep-bg); color: var(--color-b2-dativeprep); }
.hl-base[data-topic="genitiveprep"] { background-color: var(--color-b2-genitiveprep-bg); color: var(--color-b2-genitiveprep); }
.hl-base[data-topic="plusquamperfekt"] { background-color: var(--color-b2-plusquamperfekt-bg); color: var(--color-b2-plusquamperfekt); }
.hl-base[data-topic="relative"] { background-color: var(--color-b2-relative-bg); color: var(--color-b2-relative); }
.hl-base[data-topic="particles"] { background-color: var(--color-b2-particles-bg); color: var(--color-b2-particles); }

.hl-base.active[data-topic="passive"] { background-color: var(--color-b2-passive); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="subjunctive2"] { background-color: var(--color-b2-subjunctive2); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="dativeprep"] { background-color: var(--color-b2-dativeprep); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="genitiveprep"] { background-color: var(--color-b2-genitiveprep); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="plusquamperfekt"] { background-color: var(--color-b2-plusquamperfekt); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="relative"] { background-color: var(--color-b2-relative); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="particles"] { background-color: var(--color-b2-particles); color: #ffffff; box-shadow: var(--shadow-sm); }

/* --- C1 eight-topic story highlights (.hl-base variant, for pages that
   use one unified highlight class across all 36 topics rather than
   splitting C1 into .tw-hl like the letter-course pages do) --- */
.hl-base[data-topic="konjunktiv"] { background-color: var(--color-c1-konj-bg); color: var(--color-c1-konj); }
.hl-base[data-topic="partizip-konstrukt"] { background-color: var(--color-c1-part-bg); color: var(--color-c1-part); }
.hl-base[data-topic="passiv-ersatz"] { background-color: var(--color-c1-pass-bg); color: var(--color-c1-pass); }
.hl-base[data-topic="verb-gefüge"] { background-color: var(--color-c1-verb-bg); color: var(--color-c1-verb); }
.hl-base[data-topic="stil-matrix"] { background-color: var(--color-c1-stil-bg); color: var(--color-c1-stil); }
.hl-base[data-topic="modal-advanced"] { background-color: var(--color-c1-modal-bg); color: var(--color-c1-modal); }
.hl-base[data-topic="satz-komplex"] { background-color: var(--color-c1-satz-bg); color: var(--color-c1-satz); }
.hl-base[data-topic="attribut-modifier"] { background-color: var(--color-c1-attr-bg); color: var(--color-c1-attr); }

.hl-base.active[data-topic="konjunktiv"] { background-color: var(--color-c1-konj); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="partizip-konstrukt"] { background-color: var(--color-c1-part); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="passiv-ersatz"] { background-color: var(--color-c1-pass); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="verb-gefüge"] { background-color: var(--color-c1-verb); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="stil-matrix"] { background-color: var(--color-c1-stil); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="modal-advanced"] { background-color: var(--color-c1-modal); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="satz-komplex"] { background-color: var(--color-c1-satz); color: #ffffff; box-shadow: var(--shadow-sm); }
.hl-base.active[data-topic="attribut-modifier"] { background-color: var(--color-c1-attr); color: #ffffff; box-shadow: var(--shadow-sm); }

/* --- C1/C2 Advanced Topic Highlights --- */
.tw-hl { display: inline-block; padding: 1px 7px; border-radius: 6px; font-weight: 600; transition: all 0.2s ease; cursor: default; }
.tw-hl[data-topic="konjunktiv"] { background-color: var(--color-c1-konj-bg); color: var(--color-c1-konj); }
.tw-hl[data-topic="partizip-konstrukt"] { background-color: var(--color-c1-part-bg); color: var(--color-c1-part); }
.tw-hl[data-topic="passiv-ersatz"] { background-color: var(--color-c1-pass-bg); color: var(--color-c1-pass); }
.tw-hl[data-topic="verb-gefüge"] { background-color: var(--color-c1-verb-bg); color: var(--color-c1-verb); }
.tw-hl[data-topic="stil-matrix"] { background-color: var(--color-c1-stil-bg); color: var(--color-c1-stil); }
.tw-hl[data-topic="modal-advanced"] { background-color: var(--color-c1-modal-bg); color: var(--color-c1-modal); }
.tw-hl[data-topic="satz-komplex"] { background-color: var(--color-c1-satz-bg); color: var(--color-c1-satz); }
.tw-hl[data-topic="attribut-modifier"] { background-color: var(--color-c1-attr-bg); color: var(--color-c1-attr); }

.tw-hl.extra-highlighted { transform: scale(1.06); }
.tw-hl.extra-highlighted[data-topic="konjunktiv"] { background-color: var(--color-c1-konj); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="partizip-konstrukt"] { background-color: var(--color-c1-part); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="passiv-ersatz"] { background-color: var(--color-c1-pass); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="verb-gefüge"] { background-color: var(--color-c1-verb); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="stil-matrix"] { background-color: var(--color-c1-stil); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="modal-advanced"] { background-color: var(--color-c1-modal); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="satz-komplex"] { background-color: var(--color-c1-satz); color: #ffffff; box-shadow: var(--shadow-sm); }
.tw-hl.extra-highlighted[data-topic="attribut-modifier"] { background-color: var(--color-c1-attr); color: #ffffff; box-shadow: var(--shadow-sm); }

/* --- Progress Header Metrics --- */
.card-header-flex { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; width: 100%; }
.progress-container { flex: 1; height: 6px; background-color: var(--line); border-radius: 999px; border: none; overflow: hidden; min-width: 50px; }
.progress-bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.progress-step { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 0.78rem; font-weight: 600; color: var(--ink-soft); white-space: nowrap; flex-shrink: 0; }

/* --- Multiple Choice --- */
.choices-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 14px; }
.choice-box {
    display: flex;
    align-items: center;
    padding: 13px 16px;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: 12px;
    cursor: pointer;
    box-shadow: none;
    transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.1s ease;
}
.choice-box:hover { background-color: var(--surface); border-color: var(--accent-2); }
.choice-box.selected { background-color: var(--accent-soft); border-color: var(--accent); }
.choice-number { width: 20px; height: 20px; border: none; border-radius: 6px; font-family: var(--mono); font-size: 0.68rem; font-weight: 700; color: var(--ink-soft); background-color: var(--line); display: flex; align-items: center; justify-content: center; margin-right: 12px; flex-shrink: 0; }
.choice-box.selected .choice-number { background-color: var(--accent); color: #ffffff; }
.choice-text { font-weight: 600; font-size: 0.86rem; color: var(--ink-soft); }
.choice-box.selected .choice-text { color: var(--accent); }

/* --- Matching --- */
.matching-container { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 16px; }
.matching-column { display: flex; flex-direction: column; gap: 10px; }
.match-item {
    background-color: var(--surface-2);
    border: 1px solid var(--line);
    padding: 12px 16px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.86rem;
    color: var(--ink-soft);
    text-align: center;
    cursor: pointer;
    box-shadow: none;
    transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.1s ease;
    user-select: none;
}
.match-item:hover { background-color: var(--surface); border-color: var(--accent-2); }
.match-item.selected { background-color: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.match-item.matched { background-color: var(--good-soft); border-color: var(--good); color: var(--good); box-shadow: none; transform: none !important; cursor: default; pointer-events: none; }

/* ==========================================================================
   SUCCESS SCREEN + FLOATING INPUT
   ========================================================================== */
.success-card { text-align: center; background-color: var(--surface); }
.success-icon-wrap { font-size: 3rem; margin-bottom: 12px; }
.next-page-btn {
    margin-top: 16px;
    padding: 12px 26px;
    background-color: var(--accent);
    border: none;
    border-radius: 999px;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.1s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}
.next-page-btn:hover { background-color: var(--accent-2); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.next-page-btn:active { transform: translateY(0); }

.floating-container { width: 100%; padding: 0; background-color: transparent; flex-shrink: 0; }
.input-group {
    position: relative;
    background: var(--surface);
    padding: 12px 16px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    width: 100%;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--line);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.floating-input { border: none; outline: none; background: transparent; font-size: 1.05rem; color: var(--ink); width: 100%; text-align: center; padding: 14px 0 4px 0; font-weight: 600; font-family: var(--sans); }
.floating-label { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); color: var(--ink-faint); font-size: 1rem; pointer-events: none; transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); font-weight: 500; }
.floating-input:focus ~ .floating-label,
.floating-input:not(:placeholder-shown) ~ .floating-label { top: 12px; font-size: 0.72rem; font-weight: 700; color: var(--accent); }

.submit-btn {
    background: var(--accent-soft);
    border: none;
    color: var(--accent);
    padding: 10px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.1s ease;
}
.submit-btn:hover { background: var(--accent); color: #ffffff; transform: translateY(-1px); }
.submit-btn:active { transform: translateY(0); }

.input-group.correct-feedback { background-color: var(--good-soft) !important; border-color: var(--good) !important; box-shadow: var(--shadow-sm) !important; }
.input-group.correct-feedback .floating-input { color: var(--good); }
.input-group.wrong-feedback { background-color: var(--bad-soft) !important; border-color: var(--bad) !important; box-shadow: var(--shadow-sm) !important; }
.input-group.wrong-feedback .floating-input { color: var(--bad); }

.input-group.wrong-feedback,
.choice-box.wrong-feedback { animation: shakeEngine 0.4s ease-in-out !important; }
@keyframes shakeEngine { 0%, 100% { transform: translateX(0); } 20%, 60% { transform: translateX(-6px); } 40%, 80% { transform: translateX(6px); } }

/* ==========================================================================
   INLINE STORY FILL-IN BLANKS — bubbly pill inputs typed directly into the
   story paragraph itself, used by the "fill-in-story" lesson type.
   ========================================================================== */
.story-blank-input {
    display: inline-block;
    min-width: 70px;
    margin: 0 4px;
    padding: 5px 16px;
    font-family: var(--sans);
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
    color: var(--accent);
    background-color: var(--accent-soft);
    border: 2px solid transparent;
    border-radius: 999px;
    box-shadow: var(--shadow-sm);
    outline: none;
    vertical-align: middle;
    transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.1s ease;
}
.story-blank-input::placeholder { color: var(--accent); opacity: 0.4; }
.story-blank-input:focus { border-color: var(--accent); background-color: var(--surface); transform: translateY(-1px); }
.story-blank-input.is-correct { background-color: var(--good-soft); color: var(--good); border-color: var(--good); }
.story-blank-input.is-wrong { background-color: var(--bad-soft); color: var(--bad); border-color: var(--bad); animation: shakeEngine 0.4s ease-in-out; }
.story-blank-input:disabled { cursor: default; opacity: 0.9; }

.story-check-btn {
    margin-top: 20px;
    padding: 12px 26px;
    background-color: var(--accent);
    border: none;
    border-radius: 999px;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.1s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}
.story-check-btn:hover { background-color: var(--accent-2); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.story-check-btn:active { transform: translateY(0); }

.story-check-status { margin-top: 12px; font-size: 0.85rem; font-weight: 600; min-height: 1.2em; }
.story-check-status.is-success { color: var(--good); }
.story-check-status.is-error { color: var(--bad); }

/* ==========================================================================
   RIGHT SIDEBAR — reference cards
   ========================================================================== */
.sidebar-panel-right {
    height: 100%;
    overflow-y: auto;
    background-color: transparent;
    border: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.hints-header { margin-bottom: 2px; }
.hints-header h2 { font-family: var(--mono); color: var(--accent); font-size: 0.64rem; font-weight: 700; letter-spacing: 0.1em; margin-bottom: 6px; text-transform: uppercase; text-align: center; }
.hints-header h3 { font-family: var(--serif); color: var(--ink); font-size: 1.08rem; font-weight: 500; margin-bottom: 0; text-align: center; }

.table-wrapper { width: 100%; overflow: hidden; border-radius: 12px; border: 1px solid var(--line); }
.grammar-table { width: 100%; table-layout: fixed; border-collapse: separate; border-spacing: 0; background: var(--surface); font-size: 0.82rem; }
.grammar-table th { font-family: var(--mono); background-color: transparent; color: var(--ink-faint); font-weight: 700; font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase; padding: 10px 2px; border-bottom: 1px solid var(--line); text-align: center; }
.grammar-table td { padding: 9px 2px; text-align: center; font-size: 0.82rem; font-weight: 600; color: var(--ink-soft); border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
.grammar-table tr:last-child td { border-bottom: none; }

.grammar-table td.case-tag { font-size: 0.68rem; font-weight: 800; }
.row-nom td.case-tag strong { color: var(--color-nom); background-color: var(--color-nom-bg); padding: 3px 6px; border-radius: 6px; }
.row-acc td.case-tag strong { color: var(--color-acc); background-color: var(--color-acc-bg); padding: 3px 6px; border-radius: 6px; }
.grammar-table td.highlight-acc { background-color: var(--color-acc-bg); color: var(--color-acc); font-weight: 700; border-radius: 4px; }
.grammar-table td.highlight-irr { background-color: var(--color-irr-bg); color: var(--color-irr); font-weight: 700; border-radius: 4px; }
.grammar-table td.form, .grammar-table td.changed-cell { font-weight: 700; color: var(--ink); }

.tips-footer { margin-top: 14px; padding: 12px 14px; background-color: var(--gold-soft); border-radius: 12px; border: none; }
.tips-footer p { margin: 0; font-size: 0.76rem; line-height: 1.5; color: var(--ink-soft); font-weight: 500; }
.tips-footer p b, .tips-footer p strong { color: var(--ink); }

/* --- Vocab grid --- */
.vocab-grid {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)) !important;
    gap: 14px !important;
    width: 100% !important;
    max-width: 100% !important;
    padding: 4px !important;
    box-sizing: border-box !important;
    float: none !important;
    clear: both !important;
}
.vocab-card {
    background-color: var(--surface) !important;
    border: 1px solid var(--line) !important;
    border-radius: 14px !important;
    padding: 18px 12px !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    text-align: center !important;
    box-shadow: var(--shadow-sm) !important;
    transition: transform 0.15s ease, box-shadow 0.15s ease !important;
    cursor: pointer !important;
    box-sizing: border-box !important;
    min-height: 100px !important;
    height: auto !important;
    overflow: hidden !important;
}
.vocab-card:hover { transform: translateY(-2px) !important; box-shadow: var(--shadow-md) !important; background-color: var(--surface) !important; }
.vocab-card:active { transform: translateY(0) !important; }

.vocab-word {
    font-family: var(--serif) !important;
    font-size: 1.05rem !important;
    font-weight: 500 !important;
    color: var(--ink) !important;
    line-height: 1.3 !important;
    margin-bottom: 6px !important;
    margin-top: 0 !important;
    display: inline-flex !important;
    flex-direction: row !important;
    flex-wrap: wrap !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    word-break: break-word !important;
}
.vocab-translation { font-size: 0.8rem !important; font-weight: 600 !important; color: var(--ink-faint) !important; line-height: 1.4 !important; width: 100% !important; word-wrap: break-word !important; white-space: normal !important; }
.vocab-extra { font-size: 0.7rem !important; color: var(--ink-faint) !important; font-weight: 500 !important; display: block !important; margin-top: 4px !important; width: 100% !important; word-wrap: break-word !important; white-space: normal !important; }

.gender-prefix { font-family: var(--mono) !important; font-size: 0.62rem !important; font-weight: 700 !important; padding: 2px 6px !important; border-radius: 6px !important; text-transform: uppercase !important; border: none !important; display: inline-block !important; line-height: 1.6 !important; letter-spacing: 0.02em !important; flex-shrink: 0 !important; }
.masc-article { background-color: var(--color-nom-bg) !important; color: var(--color-nom) !important; }
.fem-article { background-color: var(--color-acc-bg) !important; color: var(--color-acc) !important; }
.neut-article { background-color: var(--color-irr-bg) !important; color: var(--color-irr) !important; }
.verb-article { background-color: var(--color-neg-bg) !important; color: var(--color-neg) !important; }
.conj-article { background-color: var(--color-coo-bg) !important; color: var(--color-coo) !important; }
.neutral-article { background-color: var(--line) !important; color: var(--ink-soft) !important; text-transform: none !important; }

/* --- Verb / declension / conjunction / negation reference cards --- */
.verb-reference-wrapper,
.declension-reference-wrapper,
.conjunction-reference-wrapper,
.negation-reference-wrapper {
    background-color: var(--surface);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 20px 22px;
    box-shadow: var(--shadow-sm);
}
.declension-reference-wrapper .table-wrapper { border-radius: 10px; border: 1px solid var(--line); overflow: hidden; }

.verb-header-row, .conj-header-row, .neg-header-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; border-bottom: none; padding-bottom: 0; }
.verb-header-row h3, .conj-header-row h3, .neg-header-row h3 { font-family: var(--serif); font-size: 1.08rem; font-weight: 500; color: var(--ink); margin-bottom: 0; }
.verb-header-row h3 small { font-size: 0.7rem; color: var(--ink-faint); font-weight: 500; font-family: var(--sans); }

.verb-meta-badge, .conj-meta-badge, .neg-meta-badge {
    font-family: var(--mono);
    font-size: 0.6rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 999px;
    color: var(--gold);
    background-color: var(--gold-soft);
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    box-shadow: none;
    white-space: nowrap;
    flex-shrink: 0;
}
.conj-meta-badge { color: var(--accent); background-color: var(--accent-soft); }
.neg-meta-badge { color: var(--bad); background-color: var(--bad-soft); }

.conjugation-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; width: 100%; }
.conj-row { display: flex; justify-content: space-between; align-items: center; background-color: var(--surface-2); border: 1px solid var(--line); padding: 7px 10px; border-radius: 8px; font-size: 0.8rem; color: var(--ink-soft); }
.conj-row strong { color: var(--ink-faint); font-size: 0.66rem; text-transform: uppercase; font-weight: 700; }
.conj-row span { font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.conj-row.stems-changed { background-color: var(--gold-soft); border-color: var(--gold); }
.conj-row.stems-changed span { color: var(--gold); }
.verb-alert-tip, .declension-alert-tip, .conjunction-alert-tip, .negation-alert-tip {
    margin-top: 12px; padding: 12px 14px; background-color: var(--gold-soft); border-radius: 10px; border-left: none;
}
.verb-alert-tip p, .declension-alert-tip p, .conjunction-alert-tip p, .negation-alert-tip p { margin: 0; font-size: 0.74rem; line-height: 1.5; color: var(--ink-soft); font-weight: 500; }
.verb-alert-tip p b, .verb-alert-tip p strong,
.declension-alert-tip p b, .declension-alert-tip p strong,
.conjunction-alert-tip p b, .conjunction-alert-tip p strong,
.negation-alert-tip p b, .negation-alert-tip p strong { color: var(--ink); }

.conjunction-grid, .negation-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px !important; width: 100%; box-sizing: border-box; }
.conj-type-box, .neg-type-box {
    display: flex; flex-direction: column;
    background-color: var(--surface-2);
    border: 1px solid var(--line);
    padding: 10px 8px !important;
    border-radius: 10px;
    font-size: 0.8rem;
    color: var(--ink-soft);
    overflow: hidden; min-width: 0; box-sizing: border-box;
}
.conj-type-box.sub-theme { background-color: var(--color-sub-bg); border-color: var(--color-sub); }
.neg-type-box.kein-theme { background-color: var(--color-neg-bg); border-color: var(--color-neg); }
.conj-type-box strong, .neg-type-box strong {
    color: var(--ink); font-size: 0.66rem !important; text-transform: uppercase; letter-spacing: 0.03em;
    margin-bottom: 6px; text-align: center; word-wrap: break-word; white-space: normal; width: 100%; font-weight: 700;
}
.conj-pill-row, .neg-pill-row { display: flex; gap: 5px !important; justify-content: center; margin-bottom: 6px; flex-wrap: wrap !important; width: 100%; }
.conj-word-pill { font-family: var(--mono); font-size: 0.68rem !important; font-weight: 700; color: var(--accent); background-color: var(--accent-soft); padding: 2px 6px !important; border-radius: 6px; border: none; }
.conj-word-pill.kicker { color: var(--color-sub); background-color: var(--color-sub-bg); }
.neg-word-pill { font-family: var(--mono); font-size: 0.68rem; font-weight: 700; color: var(--ink-soft); background-color: var(--line); padding: 2px 6px; border-radius: 6px; border: none; flex-shrink: 1; }
.neg-word-pill.kein-pill { color: var(--color-neg); background-color: var(--color-neg-bg); }
.conj-type-box small, .neg-type-box small { font-size: 0.66rem !important; color: var(--ink-faint); text-align: center; line-height: 1.4; font-weight: 500; word-wrap: break-word; white-space: normal; padding: 0 2px; }
.conj-type-box.sub-theme small { color: var(--color-sub); }
.neg-type-box.kein-theme small { color: var(--color-neg); }

/* ==========================================================================
   VOCAB TOOLTIP
   ========================================================================== */
.vocab-tooltip-box {
    position: absolute;
    background-color: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px 16px;
    z-index: 2000;
    box-shadow: var(--shadow-md);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    pointer-events: none;
    animation: tooltipPopIn 0.15s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.tooltip-vocab-word { font-family: var(--serif); font-size: 0.95rem; font-weight: 500; color: var(--ink); margin-bottom: 2px; }
.tooltip-vocab-translation { font-size: 0.78rem; font-weight: 500; color: var(--ink-faint); }
.vocab-tooltip-box::after {
    content: '';
    position: absolute; bottom: -6px; left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 10px; height: 10px;
    background-color: var(--surface);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
@keyframes tooltipPopIn { 0% { transform: translate(-50%, 8px); opacity: 0; } 100% { transform: translate(-50%, 0); opacity: 1; } }

/* ==========================================================================
   TITLE ROW (course-page header: "German A1 · Letter J" + "Lesson N of M")
   ========================================================================== */
.title-row { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.title-row h1 { font-family: var(--serif); font-weight: 500; font-size: 2rem; margin: 0; color: var(--ink); text-wrap: balance; }
.title-row .badge {
    font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 700;
    color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 999px; white-space: nowrap;
}

/* ==========================================================================
   HOMEPAGE BRAND BANNER
   ========================================================================== */
.card-badge.level-track-badge {
    position: absolute; top: 18px; right: 18px;
    font-family: var(--mono); font-size: 0.64rem; font-weight: 700; letter-spacing: 0.06em;
    padding: 5px 10px; border-radius: 999px; text-transform: uppercase; border: none;
    background-color: var(--accent-soft); color: var(--accent);
}

.homepage-brand-banner {
    background-color: var(--surface);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 28px;
    margin-bottom: 24px;
    width: 100%;
    position: relative;
    box-sizing: border-box;
    display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
    box-shadow: var(--shadow-sm);
}
.brand-banner-title {
    font-family: var(--serif) !important;
    color: var(--ink) !important;
    font-size: 2.1rem !important;
    font-weight: 500 !important;
    letter-spacing: 0 !important;
    text-transform: none !important;
    margin: 10px 0 0 0 !important;
    line-height: 1.15 !important;
    width: 100%;
}
.brand-badge-glow {
    display: inline-block;
    font-family: var(--mono);
    background-color: var(--good-soft);
    color: var(--good);
    font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
    padding: 5px 12px; border: none; border-radius: 999px;
}

/* ==========================================================================
   FLASHCARD ENGINE
   ========================================================================== */
.flashcard-app-section {
    width: 100vw !important; position: relative !important; left: 50% !important; right: 50% !important;
    margin-left: -50vw !important; margin-right: -50vw !important;
    background-color: var(--bg-wash-1) !important;
    padding: 50px 0 !important; margin-top: 0 !important; margin-bottom: 24px !important;
    display: flex !important; justify-content: center !important; align-items: center !important; box-sizing: border-box !important;
}
.flashcard-app-container { width: 100% !important; max-width: 850px !important; padding: 0 20px !important; margin: 0 auto !important; box-sizing: border-box !important; }
.flashcard-dashboard-card {
    background: var(--surface) !important;
    border: 1px solid var(--line) !important;
    border-radius: 24px !important;
    padding: 36px 30px !important;
    width: 100% !important;
    box-shadow: var(--shadow-md) !important;
    position: relative !important; box-sizing: border-box !important;
}
.flashcard-card-header { text-align: center !important; margin-bottom: 20px !important; }
.flashcard-badge-accent { display: inline-block !important; font-family: var(--mono) !important; background-color: var(--accent-soft) !important; color: var(--accent) !important; font-size: 0.66rem !important; font-weight: 700 !important; text-transform: uppercase !important; letter-spacing: 0.06em !important; padding: 5px 12px !important; border: none !important; border-radius: 999px !important; margin-bottom: 10px !important; }
.flashcard-card-header h2 { font-family: var(--serif) !important; font-size: 1.9rem !important; color: var(--ink) !important; font-weight: 500 !important; letter-spacing: 0 !important; margin-bottom: 6px !important; }
.flashcard-card-header p { font-size: 0.92rem !important; color: var(--ink-soft) !important; font-weight: 500 !important; }

.flashcard-metrics-row { display: flex !important; justify-content: space-between !important; align-items: center !important; padding: 12px 16px !important; background-color: var(--surface-2) !important; border: 1px solid var(--line) !important; border-radius: 14px !important; margin-bottom: 24px !important; box-sizing: border-box !important; }
.metric-group { display: flex !important; align-items: center !important; gap: 6px !important; }
.metric-label { font-family: var(--mono); font-size: 0.68rem !important; font-weight: 700 !important; color: var(--ink-faint) !important; text-transform: uppercase !important; }
.metric-value { font-size: 0.88rem !important; font-weight: 700 !important; color: var(--ink) !important; font-variant-numeric: tabular-nums; }
.metric-value.remaining-badge { color: var(--gold) !important; background-color: var(--gold-soft) !important; padding: 2px 8px !important; border-radius: 999px !important; border: none !important; }

.flashcard-stage-area { width: 100% !important; display: flex !important; justify-content: center !important; align-items: center !important; margin-bottom: 24px !important; }
.flashcard-perspective-wrapper { width: 100% !important; max-width: 480px !important; height: 260px !important; perspective: 1200px !important; cursor: pointer !important; }
.flashcard-flipper-inner { width: 100% !important; height: 100% !important; position: relative !important; transform-style: preserve-3d !important; transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important; }
.flashcard-perspective-wrapper.is-flipped .flashcard-flipper-inner { transform: rotateY(180deg) !important; }
.card-face {
    position: absolute !important; width: 100% !important; height: 100% !important;
    backface-visibility: hidden !important;
    border: 1px solid var(--line) !important;
    border-radius: 20px !important;
    padding: 24px !important;
    display: flex !important; flex-direction: column !important; align-items: center !important; justify-content: space-between !important;
    box-shadow: var(--shadow-md) !important; box-sizing: border-box !important;
}
.face-front { background-color: var(--surface) !important; }
.face-back { background-color: var(--surface-2) !important; transform: rotateY(180deg) !important; }
.face-badge-header { width: 100% !important; display: flex !important; justify-content: center !important; height: 26px !important; }
.article-pill-placeholder { font-family: var(--mono) !important; font-size: 0.62rem !important; font-weight: 700 !important; padding: 3px 8px !important; border-radius: 999px !important; border: none !important; text-transform: uppercase !important; line-height: 1 !important; display: inline-block !important; }
.face-main-word { font-family: var(--serif) !important; font-size: 2rem !important; font-weight: 500 !important; color: var(--ink) !important; letter-spacing: 0 !important; }
.face-translation-text { font-family: var(--serif) !important; font-size: 1.5rem !important; font-weight: 500 !important; color: var(--accent) !important; letter-spacing: 0 !important; }
.face-extra-phrases { font-size: 0.8rem !important; font-weight: 600 !important; color: var(--ink-faint) !important; text-align: center !important; max-width: 90% !important; }
.face-action-hint { font-size: 0.7rem !important; font-weight: 700 !important; color: var(--ink-faint) !important; text-transform: uppercase !important; letter-spacing: 0.04em !important; }

.flashcard-actions-row { display: grid !important; grid-template-columns: repeat(2, 1fr) !important; gap: 16px !important; width: 100% !important; max-width: 480px !important; margin: 0 auto !important; box-sizing: border-box !important; }
.flashcard-btn {
    display: inline-flex !important; align-items: center !important; justify-content: center !important;
    padding: 14px 20px !important; font-size: 0.92rem !important; font-weight: 700 !important; color: #ffffff !important;
    border: none !important; border-radius: 999px !important; cursor: pointer !important;
    box-shadow: var(--shadow-sm) !important; transition: transform 0.1s ease, box-shadow 0.15s ease !important;
    user-select: none !important; box-sizing: border-box !important;
}
.flashcard-btn:hover { transform: translateY(-2px) !important; box-shadow: var(--shadow-md) !important; }
.flashcard-btn:active { transform: translateY(0) !important; }
.btn-unknown { background-color: var(--bad) !important; }
.btn-known { background-color: var(--good) !important; }

.flashcard-completion-screen {
    position: absolute !important; top: 0 !important; left: 0 !important; width: 100% !important; height: 100% !important;
    background-color: var(--surface) !important; border-radius: 24px !important; z-index: 10 !important;
    display: flex; flex-direction: column !important; align-items: center !important; justify-content: center !important; text-align: center !important;
    padding: 30px !important; box-sizing: border-box !important;
}
.completion-icon { font-size: 4rem !important; margin-bottom: 14px !important; }
.flashcard-completion-screen h3 { font-family: var(--serif) !important; font-size: 1.8rem !important; font-weight: 500 !important; color: var(--good) !important; margin-bottom: 8px !important; }
.flashcard-completion-screen p { font-size: 1rem !important; color: var(--ink-soft) !important; max-width: 80% !important; margin-bottom: 24px !important; font-weight: 500 !important; line-height: 1.5 !important; }
.btn-restart { background-color: var(--accent) !important; max-width: 240px !important; }

/* ==========================================================================
   LANGUAGES PAGE
   ========================================================================== */
.language-selection-wrapper { width: 100%; max-width: 800px; margin: 40px auto; padding: 0 20px; box-sizing: border-box; display: flex; flex-direction: column; gap: 24px; }

.card.platform-title-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 30px 24px;
    box-shadow: var(--shadow-sm); position: relative; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.card.platform-title-card h2 { font-family: var(--serif) !important; color: var(--ink) !important; font-size: 1.8rem !important; font-weight: 500 !important; letter-spacing: 0 !important; margin: 8px 0 !important; text-transform: none !important; }
.card.platform-title-card p { font-size: 0.92rem; color: var(--ink-soft); font-weight: 500; max-width: 90%; line-height: 1.5; }
.card-badge.platform-badge { position: absolute; top: 18px; right: 18px; font-family: var(--mono); font-size: 0.62rem; font-weight: 700; padding: 5px 10px; border-radius: 999px; text-transform: uppercase; border: none; background-color: var(--accent-soft); color: var(--accent); }

.languages-bubbly-grid { display: flex; flex-direction: column; gap: 14px; width: 100%; }
.lang-bubble-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 20px;
    display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px;
    box-shadow: var(--shadow-sm); text-decoration: none; box-sizing: border-box; position: relative;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.lang-bubble-card.track-active { cursor: pointer; }
.lang-bubble-card.track-active:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.lang-bubble-card.track-active:active { transform: translateY(0); }
.lang-bubble-card.track-disabled { cursor: not-allowed; background-color: var(--surface-2); opacity: 0.75; }

.lang-card-details { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
.lang-card-details h3 { font-family: var(--serif); font-size: 1.3rem; font-weight: 500; color: var(--ink); margin: 0; line-height: 1.1; }
.lang-card-details small { font-size: 0.82rem; color: var(--ink-soft); font-weight: 500; line-height: 1.3; }

.lang-arrow-action { font-size: 1.4rem; font-weight: 700; color: var(--accent); padding-right: 6px; }
.lang-lock-action { font-size: 1.2rem; filter: grayscale(1); padding-right: 6px; opacity: 0.5; }

.status-pill { font-family: var(--mono); font-size: 0.62rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; border: none; text-transform: uppercase; letter-spacing: 0.03em; line-height: 1.4; margin-bottom: 2px; }
.active-pill { background-color: var(--good-soft); color: var(--good); }
.upcoming-pill { background-color: var(--gold-soft); color: var(--gold); }

.lang-flag-circle { width: 56px; height: 56px; border-radius: 50%; border: 1px solid var(--line); box-shadow: var(--shadow-sm); overflow: hidden; display: flex; flex-direction: column; flex-shrink: 0; }
.flag-ger-black { flex: 1; background-color: #000000; }
.flag-ger-red   { flex: 1; background-color: #ff0000; }
.flag-ger-gold  { flex: 1; background-color: #ffcc00; }
.flag-esp-red    { flex: 1; background-color: #aa151b; }
.flag-esp-yellow { flex: 2; background-color: #f1bf00; position: relative; }
.lang-flag-circle:has(.flag-fra-blue) { flex-direction: row; }
.flag-fra-blue  { flex: 1; background-color: #002395; }
.flag-fra-white { flex: 1; background-color: #ffffff; }
.flag-fra-red   { flex: 1; background-color: #ed2939; }

/* ==========================================================================
   CURRICULUM HUB (level & alphabet pickers)
   ========================================================================== */
.curriculum-hub-section { width: 100%; padding: 30px 0; box-sizing: border-box; }
.curriculum-hub-container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; box-sizing: border-box; display: flex; flex-direction: column; gap: 28px; }

.card.hub-main-header-card,
.card.level-section-banner-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 26px;
    box-shadow: var(--shadow-sm); position: relative; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.card.hub-main-header-card h2,
.card.level-section-banner-card h3 { font-family: var(--serif) !important; color: var(--ink) !important; font-size: 1.8rem !important; font-weight: 500 !important; letter-spacing: 0 !important; margin: 6px 0 !important; text-transform: none !important; }
.card.level-section-banner-card h3 { font-size: 1.35rem !important; color: var(--accent) !important; }
.card.hub-main-header-card p,
.card.level-section-banner-card p { font-size: 0.92rem; color: var(--ink-soft); font-weight: 500; max-width: 80%; line-height: 1.5; margin: 0; }

.hub-tag-badge { position: absolute; top: 18px; right: 18px; font-family: var(--mono); font-size: 0.62rem; font-weight: 700; padding: 5px 10px; border-radius: 999px; text-transform: uppercase; border: none; }
.badge-global { background-color: var(--accent-soft); color: var(--accent); }
.badge-a1     { background-color: var(--color-coo-bg); color: var(--color-coo); }
.badge-a2     { background-color: var(--color-acc-bg); color: var(--color-acc); }
.badge-b1     { background-color: var(--color-irr-bg); color: var(--color-irr); }
.badge-b2     { background-color: var(--color-nom-bg); color: var(--color-nom); }
.badge-c1     { background-color: var(--color-sub-bg); color: var(--color-sub); }

.levels-bubbly-grid { display: grid !important; grid-template-columns: repeat(5, 1fr) !important; gap: 14px !important; width: 100% !important; box-sizing: border-box !important; }
.level-bubble-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 16px 10px;
    box-shadow: var(--shadow-sm); text-decoration: none;
    display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 4px;
    min-height: 90px; transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.level-bubble-card.lvl-active:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); background-color: var(--accent-soft); }
.level-bubble-card.lvl-active:active { transform: translateY(0); }
.level-bubble-card.lvl-disabled { cursor: not-allowed; background-color: var(--surface-2); border-color: var(--line); box-shadow: none; }
.level-bubble-title { font-family: var(--serif); font-size: 1.35rem; font-weight: 500; color: var(--ink); line-height: 1.1; }
.level-bubble-card.lvl-disabled .level-bubble-title { color: var(--ink-faint); }

.level-status-tag { font-family: var(--mono); font-size: 0.6rem; font-weight: 700; padding: 2px 7px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.02em; line-height: 1.5; border: none; }
.lvl-active .level-status-tag.tag-active { background-color: var(--good-soft); color: var(--good); }
.lvl-disabled .level-status-tag.tag-soon { background-color: var(--gold-soft); color: var(--gold); }

.level-track-wrapper { display: flex; flex-direction: column; gap: 14px; width: 100%; }
.alphabet-bubbly-grid { display: grid !important; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)) !important; gap: 14px !important; width: 100% !important; box-sizing: border-box !important; }
.alphabet-bubble-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px 12px;
    box-shadow: var(--shadow-sm); text-decoration: none;
    display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 6px;
    min-height: 95px; transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.alphabet-bubble-card.alpha-active { cursor: pointer; }
.alphabet-bubble-card.alpha-active:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); background-color: var(--good-soft); }
.alphabet-bubble-card.alpha-active:active { transform: translateY(0); }
.alphabet-bubble-card.alpha-disabled { cursor: not-allowed; background-color: var(--surface-2); border-color: var(--line); box-shadow: none; }

.alpha-bubble-title { font-family: var(--serif); font-size: 1.1rem; font-weight: 500; color: var(--ink); line-height: 1.2; }
.alphabet-bubble-card.alpha-disabled .alpha-bubble-title { color: var(--ink-faint); }
.alpha-status-indicator { font-family: var(--mono); font-size: 0.6rem; font-weight: 700; padding: 2px 7px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.02em; line-height: 1.5; }
.alpha-active .alpha-status-indicator { background-color: var(--good-soft); color: var(--good); }
.alpha-disabled .alpha-status-indicator { background-color: var(--line); color: var(--ink-faint); }

@media (max-width: 768px) {
    .levels-bubbly-grid { grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)) !important; }
}

/* ==========================================================================
   GRAMMAR REVIEW COURSES (german-a1-letters-a-to-z-course-page.html subsection + shared topic chips)
   ========================================================================== */
.grammar-review-banner { margin-top: 8px; }

.grammar-review-grid { display: grid !important; grid-template-columns: repeat(2, 1fr) !important; gap: 16px !important; width: 100% !important; box-sizing: border-box !important; }
.grammar-review-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 22px 24px;
    box-shadow: var(--shadow-sm); text-decoration: none; display: flex; flex-direction: column; gap: 10px;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.grammar-review-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.grammar-review-card:active { transform: translateY(0); }
.grammar-review-badge { align-self: flex-start; font-family: var(--mono); font-size: 0.62rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; padding: 4px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.grammar-review-card h4 { font-family: var(--serif); font-size: 1.2rem; font-weight: 500; color: var(--ink); }
.grammar-review-card p { font-size: 0.86rem; color: var(--ink-soft); line-height: 1.5; }
.grammar-review-topics { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }

.topic-chip { font-size: 0.68rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; }
.topic-chip-1 { background: var(--color-nom-bg); color: var(--color-nom); }
.topic-chip-2 { background: var(--color-acc-bg); color: var(--color-acc); }
.topic-chip-3 { background: var(--color-irr-bg); color: var(--color-irr); }
.topic-chip-4 { background: var(--color-coo-bg); color: var(--color-coo); }
.topic-chip-5 { background: var(--color-sub-bg); color: var(--color-sub); }
.topic-chip-6 { background: var(--color-neg-bg); color: var(--color-neg); }
.topic-chip-c1-1 { background: var(--color-c1-konj-bg); color: var(--color-c1-konj); }
.topic-chip-c1-2 { background: var(--color-c1-part-bg); color: var(--color-c1-part); }
.topic-chip-c1-3 { background: var(--color-c1-pass-bg); color: var(--color-c1-pass); }
.topic-chip-c1-4 { background: var(--color-c1-verb-bg); color: var(--color-c1-verb); }
.topic-chip-c1-5 { background: var(--color-c1-stil-bg); color: var(--color-c1-stil); }
.topic-chip-c1-6 { background: var(--color-c1-modal-bg); color: var(--color-c1-modal); }
.topic-chip-c1-7 { background: var(--color-c1-satz-bg); color: var(--color-c1-satz); }
.topic-chip-c1-8 { background: var(--color-c1-attr-bg); color: var(--color-c1-attr); }
.topic-chip-a2-1 { background: var(--color-a2-perfekt-bg); color: var(--color-a2-perfekt); }
.topic-chip-a2-2 { background: var(--color-a2-modal-bg); color: var(--color-a2-modal); }
.topic-chip-a2-3 { background: var(--color-a2-twoway-bg); color: var(--color-a2-twoway); }
.topic-chip-a2-4 { background: var(--color-a2-reflexive-bg); color: var(--color-a2-reflexive); }
.topic-chip-a2-5 { background: var(--color-a2-comparative-bg); color: var(--color-a2-comparative); }
.topic-chip-a2-6 { background: var(--color-a2-superlative-bg); color: var(--color-a2-superlative); }
.topic-chip-a2-7 { background: var(--color-a2-plural-bg); color: var(--color-a2-plural); }
.topic-chip-b1-1 { background: var(--color-b1-dative-bg); color: var(--color-b1-dative); }
.topic-chip-b1-2 { background: var(--color-b1-genitive-bg); color: var(--color-b1-genitive); }
.topic-chip-b1-3 { background: var(--color-b1-separable-bg); color: var(--color-b1-separable); }
.topic-chip-b1-4 { background: var(--color-b1-inseparable-bg); color: var(--color-b1-inseparable); }
.topic-chip-b1-5 { background: var(--color-b1-nominalization-bg); color: var(--color-b1-nominalization); }
.topic-chip-b1-6 { background: var(--color-b1-imperfect-bg); color: var(--color-b1-imperfect); }
.topic-chip-b1-7 { background: var(--color-b1-imperative-bg); color: var(--color-b1-imperative); }
.topic-chip-b1-8 { background: var(--color-b1-futur1-bg); color: var(--color-b1-futur1); }
.topic-chip-b2-1 { background: var(--color-b2-passive-bg); color: var(--color-b2-passive); }
.topic-chip-b2-2 { background: var(--color-b2-subjunctive2-bg); color: var(--color-b2-subjunctive2); }
.topic-chip-b2-3 { background: var(--color-b2-dativeprep-bg); color: var(--color-b2-dativeprep); }
.topic-chip-b2-4 { background: var(--color-b2-genitiveprep-bg); color: var(--color-b2-genitiveprep); }
.topic-chip-b2-5 { background: var(--color-b2-plusquamperfekt-bg); color: var(--color-b2-plusquamperfekt); }
.topic-chip-b2-6 { background: var(--color-b2-relative-bg); color: var(--color-b2-relative); }
.topic-chip-b2-7 { background: var(--color-b2-particles-bg); color: var(--color-b2-particles); }

@media (max-width: 700px) {
    .grammar-review-grid { grid-template-columns: 1fr !important; }
}

/* ==========================================================================
   "HIGHLIGHT ALL" REVIEW CHALLENGE (a1-grammar-review-*.html)
   ========================================================================== */
.review-page { width: 100%; max-width: 820px; margin: 0 auto; padding: 24px 16px 64px; display: flex; flex-direction: column; gap: 20px; }

.review-hero h1 { font-family: var(--serif); font-size: 1.9rem; font-weight: 500; color: var(--ink); margin-bottom: 8px; }
.review-hero p { color: var(--ink-soft); line-height: 1.6; max-width: 60ch; }

.review-round-meta { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.review-round-tag { font-family: var(--mono); font-size: 0.66rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; padding: 5px 10px; border-radius: 999px; white-space: nowrap; }
.review-round-track { flex: 1; height: 6px; background: var(--line); border-radius: 999px; overflow: hidden; }
.review-round-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width 0.35s ease; }
.review-round-count { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 0.78rem; font-weight: 600; color: var(--ink-soft); white-space: nowrap; }

.review-instruction { font-size: 1.05rem; font-weight: 500; color: var(--ink); line-height: 1.6; margin-bottom: 18px; }
.review-instruction strong { color: var(--accent); }

.review-passage { font-family: var(--serif); font-size: 1.2rem; line-height: 2.4; color: var(--ink); }

.token {
    display: inline-block; cursor: pointer; padding: 2px 6px; margin: 2px 1px; border-radius: 6px;
    border: 1px solid transparent; background: var(--surface-2);
    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.token:hover { border-color: var(--accent-2); transform: translateY(-1px); }
.token.picked { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); font-weight: 600; }

.token.token-correct { background: var(--good-soft); border-color: var(--good); color: var(--good); font-weight: 700; }
.token.token-wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); text-decoration: line-through; }
.token.token-missed { background: var(--gold-soft); border-color: var(--gold); color: var(--gold); font-weight: 700; }
.token.token-neutral { cursor: default; }
.token.token-neutral:hover { border-color: transparent; transform: none; }

.review-check-btn, .review-next-btn {
    margin-top: 20px; padding: 12px 26px; border: none; border-radius: 999px; font-size: 0.9rem; font-weight: 700;
    cursor: pointer; box-shadow: var(--shadow-sm); transition: transform 0.1s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    display: inline-flex; align-items: center; gap: 8px;
}
.review-check-btn { background: var(--accent); color: #ffffff; }
.review-check-btn:hover { background: var(--accent-2); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.review-next-btn { background: var(--good); color: #ffffff; }
.review-next-btn:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }

.review-round-result { margin-top: 16px; padding: 14px 18px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); font-size: 0.9rem; color: var(--ink-soft); line-height: 1.5; }
.review-round-result strong { color: var(--ink); }

.review-summary-card { text-align: center; }
.review-summary-icon { font-size: 3rem; margin-bottom: 12px; }
.review-summary-score { font-family: var(--serif); font-size: 2.2rem; font-weight: 500; color: var(--accent); margin-bottom: 8px; }

/* ==========================================================================
   AUDIO BUTTON
   ========================================================================== */
.audio-control-container { display: flex; width: 100%; justify-content: flex-start; margin-bottom: 14px; }
.audio-play-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    background-color: var(--accent-soft); color: var(--accent);
    border: none; border-radius: 999px; padding: 7px 14px;
    font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
    box-shadow: none; cursor: pointer; transition: background-color 0.15s ease, color 0.15s ease;
}
.audio-play-btn:hover { background-color: var(--accent); color: #ffffff; }
.audio-play-btn:disabled { background-color: var(--line); color: var(--ink-faint); box-shadow: none; cursor: not-allowed; }

/* ==========================================================================
   LETTER PREV/NEXT NAVIGATION ARROWS (flank the story card)
   ========================================================================== */
.story-nav-wrapper { display: flex; align-items: center; gap: 8px; width: 100%; }
.story-nav-wrapper #storyCard { flex: 1; min-width: 0; }

.story-nav-btn {
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center; gap: 3px;
    min-width: 30px; height: 30px;
    padding: 0 8px;
    border-radius: 999px;
    background-color: var(--surface);
    border: 1px solid var(--line);
    color: var(--ink-soft);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    font-family: var(--mono); font-size: 0.64rem; font-weight: 700; letter-spacing: 0.02em;
    transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}
.story-nav-btn svg { width: 13px; height: 13px; flex-shrink: 0; }
.story-nav-letter { line-height: 1; }
.story-nav-btn:hover:not(:disabled) { background-color: var(--accent); color: #ffffff; box-shadow: var(--shadow-md); transform: translateY(-2px); }
.story-nav-btn:active:not(:disabled) { transform: translateY(0); }
.story-nav-btn:disabled { opacity: 0.35; cursor: not-allowed; box-shadow: none; }

@media (max-width: 768px) {
    .story-nav-wrapper { gap: 6px; }
    .story-nav-btn { min-width: 26px; height: 26px; padding: 0 6px; font-size: 0.58rem; gap: 2px; }
    .story-nav-btn svg { width: 11px; height: 11px; }
}

/* ==========================================================================
   VOCAB DIRECTORY (alphabetical vocab hub)
   ========================================================================== */
.vocab-directory-section { width: 100%; padding: 30px 0; box-sizing: border-box; }
.vocab-directory-container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; box-sizing: border-box; display: flex; flex-direction: column; gap: 24px; }

.card.vocab-header-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 26px;
    box-shadow: var(--shadow-sm); position: relative; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.card.vocab-header-card h2 { font-family: var(--serif) !important; color: var(--ink) !important; font-size: 1.8rem !important; font-weight: 500 !important; letter-spacing: 0 !important; margin: 6px 0 !important; text-transform: none !important; }
.card.vocab-header-card p { font-size: 0.92rem; color: var(--ink-soft); font-weight: 500; max-width: 80%; line-height: 1.5; }
.lexicon-badge { position: absolute; top: 18px; right: 18px; font-family: var(--mono); font-size: 0.62rem; font-weight: 700; padding: 5px 10px; border-radius: 999px; text-transform: uppercase; border: none; background-color: var(--color-c1-verb-bg); color: var(--color-c1-verb); }

.vocab-bubbly-grid { display: grid !important; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)) !important; gap: 14px !important; width: 100% !important; box-sizing: border-box !important; }
.vocab-bubble-card {
    background-color: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 22px 14px;
    box-shadow: var(--shadow-sm); text-decoration: none; box-sizing: border-box;
    display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 6px;
    min-height: 105px; transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.vocab-bubble-card.deck-active { cursor: pointer; }
.vocab-bubble-card.deck-active:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); background-color: var(--color-nom-bg); }
.vocab-bubble-card.deck-active:active { transform: translateY(0); }
.vocab-bubble-card.deck-disabled { cursor: not-allowed; background-color: var(--surface-2); border-color: var(--line); box-shadow: none; }

.vocab-bubble-title { font-family: var(--serif); font-size: 1.1rem; font-weight: 500; color: var(--ink); line-height: 1.2; letter-spacing: 0; }
.vocab-bubble-card.deck-disabled .vocab-bubble-title { color: var(--ink-faint); }

.vocab-status-indicator { font-family: var(--mono); font-size: 0.6rem; font-weight: 700; padding: 2px 7px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.02em; line-height: 1.5; }
.deck-active .vocab-status-indicator.indicator-active { background-color: var(--good-soft); color: var(--good); }
.deck-disabled .vocab-status-indicator.indicator-locked { background-color: var(--line); color: var(--ink-faint); }

/* ==========================================================================
   VOCAB MARQUEE (ticker)
   ========================================================================== */
.card.continuous-marquee-card {
    background-color: var(--surface) !important;
    border: 1px solid var(--line) !important;
    border-radius: 20px !important;
    padding: 14px 18px !important;
    box-shadow: var(--shadow-sm) !important;
    margin-top: 0 !important; margin-bottom: 0 !important;
    display: flex; flex-direction: column; gap: 10px; box-sizing: border-box;
}
.marquee-card-header { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.marquee-badge-accent { font-family: var(--mono); font-size: 0.64rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; border: none; background-color: var(--good-soft); color: var(--good); text-transform: uppercase; letter-spacing: 0.03em; }
.marquee-meta-subtext { font-family: var(--mono); font-size: 0.68rem; font-weight: 600; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.02em; }

.marquee-viewport-window {
    width: 100%; overflow: hidden;
    border: 1px solid var(--line);
    background-color: var(--surface-2);
    border-radius: 999px;
    padding: 12px 0;
    position: relative; box-sizing: border-box;
    white-space: nowrap;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
            mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.marquee-scrolling-track { display: inline-flex; align-items: center; gap: 28px; padding-left: 28px; will-change: transform; }
.marquee-item { display: inline-flex; align-items: center; gap: 8px; font-size: 0.84rem; font-weight: 500; background-color: transparent; border: none; padding: 0; border-radius: 0; box-shadow: none; user-select: none; }

.hl-de { color: var(--ink); font-weight: 700; }
.hl-en { color: var(--ink-soft); font-weight: 500; font-style: italic; }

/* ==========================================================================
   SCROLLABLE PAGE OVERRIDES (sticky side panels while the feed scrolls)
   ========================================================================== */
body.scrollable-page { overflow-y: auto !important; height: auto !important; }
body.scrollable-page .app-layout { height: auto !important; min-height: calc(100vh - 64px) !important; overflow: visible !important; }
body.scrollable-page .sidebar-panel-left { height: calc(100vh - 89px) !important; position: sticky !important; top: 79px !important; overflow-y: auto; }
body.scrollable-page .sidebar-panel-right { height: calc(100vh - 89px) !important; position: sticky !important; top: 79px !important; overflow-y: auto; }

@media (max-width: 1100px) {
    .app-layout { grid-template-columns: 1fr; height: auto !important; overflow: visible !important; }
    .sidebar-panel-left, .sidebar-panel-right { position: static; height: auto; overflow-y: visible; }
    .center-content { height: auto; overflow: visible; }
    .choices-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}