html:root {
    --bg: #f7f2e7;
    --surface: #ffffff;
    --surface-2: #fbf7ee;
    --ink: #191726;
    --ink-soft: #5a5470;
    --ink-faint: #9089a3;
    --accent: #e0432b;
    --accent-2: #c23621;
    --accent-soft: rgba(224, 67, 43, 0.12);
    --gold: #b4870a;
    --gold-soft: rgba(239, 176, 0, 0.18);
    --line: #e7dec7;
    --line-strong: #d8cba8;
    --good: #2f9e58;
    --good-soft: #e6f4ea;
    --bad: #d64545;
    --bad-soft: #fbe9e9;

    --shadow-sm: 0 1px 2px rgba(25, 23, 38, 0.06), 0 1px 1px rgba(25, 23, 38, 0.04);
    --shadow-md: 0 10px 24px -8px rgba(25, 23, 38, 0.16), 0 2px 8px -2px rgba(25, 23, 38, 0.06);

    --ease: cubic-bezier(0.4, 0, 0.2, 1);

    --serif: "Futura", "Avenir Next", Avenir, "Century Gothic", system-ui, sans-serif;
    --sans: "Avenir Next", Avenir, "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

    --color-nom: #1d5fa6; --color-nom-bg: #e5eef8;
    --color-acc: #e0432b; --color-acc-bg: #fbe7e3;
    --color-irr: #b4870a; --color-irr-bg: #faf1d6;
    --color-coo: #0f7168; --color-coo-bg: #e2f2f0;
    --color-sub: #6c4ba6; --color-sub-bg: #eee8f7;
    --color-neg: #b8355f; --color-neg-bg: #f8e5eb;
}

@media (prefers-color-scheme: dark) {
    html:root {
        --bg: #131220;
        --surface: #1c1a2c;
        --surface-2: #211f34;
        --ink: #f3eee1;
        --ink-soft: #b3abc9;
        --ink-faint: #867f9c;
        --accent: #ff5b41;
        --accent-2: #ff7b62;
        --accent-soft: rgba(255, 91, 65, 0.16);
        --gold: #ffcb3d;
        --gold-soft: rgba(255, 203, 61, 0.18);
        --line: #33304a;
        --line-strong: #413c5c;
        --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 10px 28px -10px rgba(0, 0, 0, 0.55);

        --color-nom: #5b98e8; --color-nom-bg: rgba(91, 152, 232, 0.16);
        --color-acc: #ff5b41; --color-acc-bg: rgba(255, 91, 65, 0.16);
        --color-irr: #ffcb3d; --color-irr-bg: rgba(255, 203, 61, 0.18);
        --color-coo: #2fb6a8; --color-coo-bg: rgba(47, 182, 168, 0.16);
        --color-sub: #9a7bd6; --color-sub-bg: rgba(154, 123, 214, 0.18);
        --color-neg: #e06a94; --color-neg-bg: rgba(224, 106, 148, 0.18);
    }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-mark {
    width: 34px;
    height: 34px;
    flex: 0 0 auto;
}

.brand-word {
    font-family: var(--serif);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.01em;
    color: var(--ink);
}

.brand-word b {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

@media (min-width: 861px) {
    .nav-links {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }
}

.nav-links > a {
    font-family: var(--mono);
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    text-decoration: none;
    padding: 9px 14px;
    border-radius: 8px;
    color: var(--ink-soft);
    transition: background 0.15s ease, color 0.15s ease;
}

.nav-links > a:hover {
    background: var(--surface-2);
    color: var(--ink);
}

.navbar .dropdown-item {
    position: relative;
}

.navbar .dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-family: var(--mono);
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 9px 14px;
    border-radius: 8px;
    color: var(--ink-soft);
    text-decoration: none;
    border: none;
    background: none;
    transition: background 0.15s ease, color 0.15s ease;
}

.navbar .dropdown-trigger:hover,
.navbar .dropdown-item.open .dropdown-trigger {
    background: var(--surface-2);
    color: var(--ink);
}

.navbar .dropdown-trigger.active {
    color: var(--accent);
}

.navbar .caret {
    transition: transform 0.18s ease;
    font-size: 0.7em;
}

.navbar .dropdown-item.open .caret {
    transform: rotate(180deg);
}

.navbar .dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 230px;
    background: var(--surface);
    border: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
    border-radius: 18px;
    box-shadow: var(--shadow-md);
    padding: 14px 10px 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px) scale(0.98);
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
    overflow: hidden;
}

.navbar .dropdown-menu::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--gold), var(--color-nom));
}

.navbar .dropdown-item.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.navbar .dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--ink-soft);
    transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.navbar .dropdown-menu a:hover {
    background: var(--surface-2);
    color: var(--ink);
    transform: translateX(2px);
}

.dropdown-flag {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.15s ease;
}

.dropdown-flag-es {
    background: linear-gradient(to bottom, #c60b1e 0 25%, #ffc400 25% 75%, #c60b1e 75% 100%);
}

.dropdown-flag-fr {
    background: linear-gradient(to right, #0055a4 0 33.33%, #ffffff 33.33% 66.66%, #ef4135 66.66% 100%);
}

.navbar .dropdown-menu a:hover .dropdown-flag-es {
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1), 0 0 0 3px var(--color-acc-bg);
}

.navbar .dropdown-menu a:hover .dropdown-flag-fr {
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1), 0 0 0 3px var(--color-nom-bg);
}

.dropdown-lang-name {
    flex: 1;
}

.dropdown-soon-badge {
    font-family: var(--mono);
    font-size: 0.58rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--gold);
    background: var(--gold-soft);
    padding: 3px 7px;
    border-radius: 999px;
    flex-shrink: 0;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 860px) {
    .nav-links {
        position: fixed;
        inset: 60px 0 auto 0;
        background: var(--surface);
        flex-direction: column;
        align-items: stretch;
        padding: 10px;
        border-bottom: 1px solid var(--line);
        box-shadow: var(--shadow-md);
        transform: translateY(-8px);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
        gap: 2px;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links > a,
    .navbar .dropdown-trigger {
        width: 100%;
    }

    .navbar .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        padding-left: 14px;
        margin-top: 0;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
    }

    .navbar .dropdown-menu::before {
        display: none;
    }

    .navbar .dropdown-item.open .dropdown-menu {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }
}

.cac-main {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 94px 16px 40px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.cac-main::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(640px 420px at 12% 6%, var(--accent-soft), transparent 60%),
        radial-gradient(560px 380px at 94% 16%, var(--gold-soft), transparent 60%);
    opacity: 0.7;
    pointer-events: none;
}

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

.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-a1 { background-color: var(--color-coo-bg); color: var(--color-coo); }

.cac-fn-card {
    border-radius: 24px;
    border-color: color-mix(in srgb, var(--line) 70%, transparent);
    box-shadow: var(--shadow-md);
}

.cac-fn-card > h2 {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--ink);
    margin: 0 0 20px;
}

.cac-fn-page-hint {
    font-size: 0.86rem;
    color: var(--ink-soft);
    margin: -8px 0 20px;
}

.cac-fn1-card {
    background: var(--surface);
    border: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    padding: 24px 26px;
}

.cac-fn1-card h3 {
    font-family: var(--serif);
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--ink);
    margin: 0;
}

.cac-fn1-step-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

.cac-fn1-step-label {
    font-family: var(--mono);
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-faint);
}

.cac-fn1-step-count {
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--ink-soft);
}

.cac-fn1-progress-track {
    position: relative;
    height: 3px;
    margin: 0 5px 16px;
    border-radius: 999px;
    background: var(--line);
}

.cac-fn1-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.cac-fn1-progress-thumb {
    position: absolute;
    top: 50%;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 16%, transparent);
    transform: translate(-50%, -50%);
    transition: left 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.cac-vq-sentence {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.15rem;
    line-height: 1.6;
    color: var(--ink);
    margin: 0 0 6px;
}

.cac-vq-mc {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 14px;
}

.cac-vq-mc[hidden] {
    display: none;
}

.cac-vq-mc-option {
    font-family: var(--sans, var(--serif));
    font-size: 0.9rem;
    padding: 11px 14px;
    border-radius: 12px;
    border: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
    background: var(--surface-2);
    color: var(--ink);
    text-align: left;
    cursor: pointer;
    transition: border-color 0.15s var(--ease), background 0.15s var(--ease);
}

.cac-vq-mc-option:hover:not(:disabled) {
    border-color: var(--accent);
}

.cac-vq-mc-option.cac-vq-correct {
    background: var(--good-soft);
    border-color: var(--good);
    color: var(--good);
    font-weight: 700;
}

.cac-vq-mc-option.cac-vq-incorrect {
    background: var(--bad-soft);
    border-color: var(--bad);
    color: var(--bad);
}

.cac-vq-mc-option:disabled {
    cursor: default;
}

.cac-vq-feedback {
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 0.86rem;
    line-height: 1.5;
    margin: 0 0 8px;
}

.cac-vq-feedback[hidden] {
    display: none;
}

.cac-vq-feedback-good {
    background: var(--good-soft);
    color: var(--good);
}

.cac-vq-feedback-bad {
    background: var(--bad-soft);
    color: var(--bad);
}

.cac-vq-feedback strong {
    font-family: var(--serif);
}

.cac-vq-btn {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 11px 20px;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s var(--ease), transform 0.15s var(--ease), opacity 0.2s var(--ease);
}

.cac-vq-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.cac-vq-btn-primary {
    background: var(--accent);
    color: #ffffff;
}

.cac-vq-btn-primary:not(:disabled):hover {
    background: var(--accent-2);
}

.cac-vq-btn-primary:not(:disabled):active {
    transform: scale(0.97);
}

.cac-vq-continue-btn {
    width: 100%;
}

.cac-vq-continue-btn[hidden] {
    display: none;
}

.site-footer {
    text-align: center;
    padding: 28px 20px 44px;
    color: var(--ink-faint);
    font-size: 0.82rem;
}