:root {
    color-scheme: light dark;
    --surface: #ffffff;
    --surface-muted: #eff4ff;
    --surface-subtle: #f8fafc;
    --border: #dbe4f0;
    --text: #0f172a;
    --text-muted: #475569;
    --brand: #1d4ed8;
    --brand-soft: #dbeafe;
    --success: #15803d;
    --warning: #b45309;
    --danger: #b91c1c;
    --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
    font-family: "Inter", "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --surface: #0f172a;
        --surface-muted: #111c38;
        --surface-subtle: #172033;
        --border: #24314a;
        --text: #e2e8f0;
        --text-muted: #94a3b8;
        --brand-soft: rgba(59, 130, 246, 0.18);
        --shadow: none;
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    background: linear-gradient(180deg, var(--surface-subtle), var(--surface));
    color: var(--text);
}

a {
    color: inherit;
}

.shell {
    display: grid;
    grid-template-columns: 18rem minmax(0, 1fr);
    min-height: 100vh;
}

.shell__sidebar {
    padding: 2rem 1.25rem;
    border-right: 1px solid var(--border);
    background: var(--surface-muted);
}

.shell__brand {
    margin-bottom: 2rem;
}

.shell__eyebrow {
    display: inline-flex;
    margin-bottom: 0.75rem;
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    background: var(--brand-soft);
    color: var(--brand);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.shell__title {
    margin: 0;
    font-size: 1.5rem;
}

.shell__subtitle {
    margin: 0.6rem 0 0;
    color: var(--text-muted);
    line-height: 1.5;
}

.shell__main {
    padding: 2rem;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.page-header__meta {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    color: var(--text-muted);
}

.page-grid {
    display: grid;
    gap: 1rem;
}

.page-grid--stats {
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    margin-bottom: 1.5rem;
}

.page-grid--two-columns {
    grid-template-columns: minmax(0, 1.6fr) minmax(18rem, 1fr);
}

.page-grid--planning {
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
}

.card {
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 1.1rem;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.card h2,
.card h3,
.card h4 {
    margin-top: 0;
}

.stat-card__value {
    font-size: 2rem;
    font-weight: 800;
    margin-top: 0.5rem;
}

.stat-card__hint {
    margin-top: 0.35rem;
    color: var(--text-muted);
}

.audit-list,
.chapter-list,
.timeline-list,
.meta-list,
.workspace-activity,
.document-list,
.participant-list {
    display: grid;
    gap: 0.85rem;
    padding: 0;
    margin: 0;
    list-style: none;
}

.badge {
    display: inline-flex;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    background: var(--brand-soft);
    color: var(--brand);
    font-size: 0.8rem;
    font-weight: 700;
}

.badge--warning {
    background: rgba(245, 158, 11, 0.18);
    color: var(--warning);
}

.badge--danger {
    background: rgba(239, 68, 68, 0.18);
    color: var(--danger);
}

.badge--success {
    background: rgba(34, 197, 94, 0.18);
    color: var(--success);
}

.input-bar {
    margin-top: 1rem;
    padding: 1rem 1.1rem;
    border: 1px dashed var(--border);
    border-radius: 1rem;
    background: var(--surface-subtle);
    color: var(--text-muted);
}

.input-bar strong {
    color: var(--text);
}

@media (max-width: 960px) {
    .shell {
        grid-template-columns: 1fr;
    }

    .shell__sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }

    .page-grid--two-columns {
        grid-template-columns: 1fr;
    }
}