:root {
    --ink: #172033;
    --muted: #5f6878;
    --line: #d8dde6;
    --surface: #f5f7fa;
    --brand: #285d9f;
    --brand-dark: #1d477b;
}

body {
    color: var(--ink);
    background: #ffffff;
}

.site-header {
    background: rgba(255, 255, 255, 0.96);
}

.navbar-brand {
    color: var(--ink);
    letter-spacing: 0;
}

.nav-user {
    max-width: 220px;
    overflow: hidden;
    color: var(--muted);
    font-size: 0.875rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-primary {
    --bs-btn-bg: var(--brand);
    --bs-btn-border-color: var(--brand);
    --bs-btn-hover-bg: var(--brand-dark);
    --bs-btn-hover-border-color: var(--brand-dark);
}

.hero {
    padding: 88px 0 64px;
}

.hero h1 {
    max-width: 760px;
    font-size: clamp(2.25rem, 4vw, 4.25rem);
    line-height: 1.04;
    letter-spacing: 0;
}

.lead {
    max-width: 690px;
    color: var(--muted);
}

.eyebrow {
    color: var(--brand);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.status-panel {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 18px 50px rgba(23, 32, 51, 0.1);
    overflow: hidden;
}

.status-row {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 20px;
    border-bottom: 1px solid var(--line);
}

.status-row span {
    color: var(--muted);
}

.status-note {
    padding: 20px;
    background: var(--surface);
    color: var(--muted);
}

.section {
    padding: 64px 0;
}

.section-muted {
    background: var(--surface);
}

.section h2 {
    font-size: 1.35rem;
    letter-spacing: 0;
}

.section p,
.flow-list {
    color: var(--muted);
}

.flow-list {
    margin: 0;
    padding-left: 1.25rem;
}

.flow-list li {
    margin-bottom: 12px;
}

.site-footer {
    padding: 28px 0;
    border-top: 1px solid var(--line);
    color: var(--muted);
}

.app-page {
    min-height: calc(100vh - 141px);
    background: var(--surface);
    padding: 40px 0 56px;
}

.page-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
}

.page-heading h1 {
    margin: 0 0 4px;
    font-size: 1.8rem;
}

.page-heading p {
    margin: 0;
    color: var(--muted);
}

.metric,
.form-panel,
.detail-panel {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    padding: 20px;
}

.metric span {
    display: block;
    color: var(--muted);
    font-size: 0.88rem;
}

.metric strong {
    display: block;
    margin-top: 4px;
    font-size: 1.8rem;
}

.code-area {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.88rem;
}

.table {
    --bs-table-bg: #ffffff;
}

.log-entry {
    border-left: 3px solid var(--line);
    padding: 10px 12px;
    background: #ffffff;
}

.workflow-toolbar,
.workflow-step-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.workflow-step {
    margin-top: 16px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    padding: 18px;
}

.auth-page {
    background: var(--surface);
    padding: 72px 0;
}

.auth-box {
    width: min(100%, 420px);
    margin: 0 auto;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    padding: 28px;
    box-shadow: 0 18px 50px rgba(23, 32, 51, 0.09);
}

.auth-box h1 {
    margin-bottom: 8px;
    font-size: 1.55rem;
}

.auth-muted,
.auth-footer-link {
    color: var(--muted);
}

.auth-footer-link {
    margin: 18px 0 0;
    text-align: center;
}

@media (max-width: 575.98px) {
    .hero {
        padding: 56px 0 40px;
    }

    .status-row {
        flex-direction: column;
        gap: 4px;
    }

    .nav-user {
        max-width: 140px;
    }

    .page-heading {
        display: block;
    }

    .page-heading .btn {
        margin-top: 14px;
        width: 100%;
    }
}

/* ── Quiz ────────────────────────────────────────────────────────────────── */

.quiz-wrap {
    max-width: 720px;
    margin: 0 auto;
}

.card-quiz-cat {
    border: 1px solid var(--line);
    border-radius: 10px;
    transition: box-shadow .15s, border-color .15s;
    color: var(--ink);
}

.card-quiz-cat:hover {
    border-color: var(--brand);
    box-shadow: 0 2px 12px rgba(40,93,159,.12);
}

.quiz-cat-badge {
    font-size: 2rem;
    font-weight: 700;
    color: var(--brand);
    line-height: 1;
    margin-bottom: 4px;
}

.quiz-cat-label {
    font-size: .8rem;
    color: var(--muted);
    margin-bottom: 2px;
}

.quiz-cat-count {
    font-size: .75rem;
}

.quiz-card {
    border-radius: 12px;
    border: 1px solid var(--line);
}

.quiz-media {
    text-align: center;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
}

.quiz-media-el {
    width: 100%;
    max-height: 380px;
    object-fit: contain;
    display: block;
}

.quiz-question {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 1.25rem;
}

.btn-quiz-ans {
    background: var(--surface);
    border: 1px solid var(--line);
    color: var(--ink);
    border-radius: 8px;
    padding: .75rem 1rem;
    font-size: .95rem;
    transition: background .12s, border-color .12s;
}

.btn-quiz-ans:hover {
    background: #e8edf5;
    border-color: var(--brand);
    color: var(--ink);
}

.quiz-result-banner {
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    padding: .5rem 0 1rem;
}

.quiz-result-ok  { border-color: #198754 !important; }
.quiz-result-err { border-color: #dc3545 !important; }

.quiz-ans-correct {
    background: #d1e7dd;
    border-color: #198754 !important;
    color: #0a3622;
}

.quiz-ans-wrong {
    background: #f8d7da;
    border-color: #dc3545 !important;
    color: #58151c;
}

@media (max-width: 575.98px) {
    .quiz-question { font-size: 1rem; }
    .quiz-result-banner { font-size: 1.15rem; }
}