:root {
    color-scheme: dark;
    --bg-gradient: radial-gradient(circle at top, #0b1220 0%, #05070e 45%, #02030a 100%);
    --surface: rgba(15, 23, 42, 0.78);
    --surface-strong: rgba(15, 23, 42, 0.92);
    --surface-soft: rgba(30, 41, 59, 0.6);
    --border: rgba(148, 163, 184, 0.15);
    --divider: rgba(148, 163, 184, 0.12);
    --shadow-lg: 0 24px 48px rgba(2, 6, 23, 0.45);
    --shadow-md: 0 16px 32px rgba(2, 6, 23, 0.35);
    --shadow-sm: 0 8px 16px rgba(2, 6, 23, 0.28);
    --text-primary: #f8fafc;
    --text-secondary: #cbd5f5;
    --text-muted: #94a3b8;
    --accent: #fbbf24;
    --accent-soft: rgba(251, 191, 36, 0.14);
    --brand-gradient: linear-gradient(135deg, #fbbf24 0%, #38bdf8 55%, #a855f7 100%);
    --brand-glow: 0 0 18px rgba(59, 130, 246, 0.4);
    --success: #34d399;
    --success-soft: rgba(52, 211, 153, 0.12);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.12);
    --warning: #facc15;
    --spacing-xl: clamp(3rem, 7vw, 5rem);
    --spacing-lg: clamp(2rem, 5vw, 3.5rem);
    --spacing-md: clamp(1.25rem, 3vw, 2.25rem);
    --spacing-sm: 1rem;
    --radius-lg: 26px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --radius-xs: 8px;
    --transition: 0.28s ease;
    font-family: 'Noto Sans TC', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    font-family: inherit;
    letter-spacing: 0.01em;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover,
a:focus-visible {
    color: var(--accent);
}

img {
    max-width: 100%;
    display: block;
}

.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(7, 11, 20, 0.82);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(18px);
    box-shadow: 0 10px 30px rgba(2, 6, 23, 0.45);
}

.header-inner {
    width: min(1200px, calc(100% - 3rem));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1rem 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    transition: transform var(--transition), color var(--transition);
}

.brand::before {
    content: 'Σ';
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: var(--brand-gradient);
    color: #0b1220;
    font-weight: 800;
    font-size: 1.1rem;
    box-shadow: var(--brand-glow);
}

.brand:hover {
    transform: translateY(-2px);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.header-nav a {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    border: 1px solid transparent;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.header-nav a:hover,
.header-nav a:focus-visible,
.header-nav a.active {
    background: rgba(148, 163, 184, 0.12);
    border-color: rgba(148, 163, 184, 0.18);
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.9rem;
    border-radius: 999px;
    font-weight: 600;
    color: var(--text-secondary);
    border: 1px solid rgba(148, 163, 184, 0.18);
    background: rgba(148, 163, 184, 0.08);
    transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.back-link:hover {
    transform: translateX(-2px);
    border-color: rgba(148, 163, 184, 0.35);
    background: rgba(148, 163, 184, 0.16);
}

.app-main {
    flex: 1;
}

.section {
    width: min(1200px, calc(100% - 3rem));
    margin: 0 auto;
    padding: var(--spacing-lg) 0;
}

.section--compact {
    padding-block: var(--spacing-md);
}

.hero {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1.1rem;
    border-radius: 999px;
    background: rgba(56, 189, 248, 0.12);
    color: #bae6fd;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.hero h1 {
    margin: 1.25rem 0 0.75rem;
    font-size: clamp(2.2rem, 4vw, 3.25rem);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.hero p {
    margin: 0 auto;
    max-width: 680px;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.hero-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    border: none;
    cursor: pointer;
    border-radius: 999px;
    padding: 0.75rem 1.6rem;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.02em;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--brand-gradient);
    color: #050505;
    box-shadow: 0 18px 30px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 24px 40px rgba(56, 189, 248, 0.35);
}

.btn-outline {
    background: rgba(148, 163, 184, 0.08);
    color: var(--text-secondary);
    border: 1px solid rgba(148, 163, 184, 0.24);
}

.btn-outline:hover {
    transform: translateY(-3px);
    border-color: rgba(148, 163, 184, 0.36);
    background: rgba(148, 163, 184, 0.16);
}

.grid-cards {
    display: grid;
    gap: 1.75rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    position: relative;
    padding: 1.75rem;
    border-radius: var(--radius-lg);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(148, 163, 184, 0.32);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-title span.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(251, 191, 36, 0.16);
    color: var(--accent);
    font-size: 1.3rem;
}

.card-subtitle {
    margin-top: -0.5rem;
    margin-bottom: 1.25rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.15);
    color: var(--text-secondary);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.form-grid {
    display: grid;
    gap: 1.25rem;
}

@media (min-width: 720px) {
    .form-grid--two-column {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.input-control {
    flex: 1;
    min-width: min(260px, 100%);
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.input-control:focus {
    outline: none;
    border-color: rgba(59, 130, 246, 0.65);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    background: rgba(15, 23, 42, 0.85);
}

.helper-text {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.alert {
    border-radius: var(--radius-sm);
    padding: 1rem 1.1rem;
    display: none;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.alert.show {
    display: flex;
}

.alert--danger {
    background: var(--danger-soft);
    border: 1px solid rgba(248, 113, 113, 0.35);
    color: var(--danger);
}

.alert--success {
    background: var(--success-soft);
    border: 1px solid rgba(52, 211, 153, 0.35);
    color: var(--success);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.stat-card {
    background: var(--surface-soft);
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.12);
    padding: 1.15rem 1.25rem;
    transition: transform var(--transition), border-color var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(148, 163, 184, 0.28);
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.stat-value {
    margin-top: 0.35rem;
    font-size: 1.85rem;
    font-weight: 700;
}

.tab-nav {
    display: inline-flex;
    gap: 0.5rem;
    padding: 0.5rem;
    background: rgba(15, 23, 42, 0.6);
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.12);
}

.tab-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-weight: 600;
    padding: 0.65rem 1.1rem;
    border-radius: 999px;
    cursor: pointer;
    transition: color var(--transition), background var(--transition), transform var(--transition);
}

.tab-btn:hover {
    color: var(--text-secondary);
}

.tab-btn.active {
    background: rgba(251, 191, 36, 0.18);
    color: var(--accent);
    transform: translateY(-2px);
}

.tab-content {
    display: none;
    margin-top: 1.5rem;
}

.tab-content.active {
    display: block;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.12);
    background: rgba(15, 23, 42, 0.6);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 520px;
}

th,
td {
    padding: 1rem 1.2rem;
    text-align: center;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

th {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: rgba(15, 23, 42, 0.65);
}

tbody tr {
    transition: background var(--transition), transform var(--transition);
}

tbody tr:hover {
    background: rgba(148, 163, 184, 0.08);
}

tbody tr.highlighted {
    background: rgba(56, 189, 248, 0.16);
}

tbody tr.highlighted td {
    color: #e0f2fe;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.65rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.pagination button {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.15);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-muted);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.pagination button:hover:not(:disabled) {
    background: rgba(148, 163, 184, 0.16);
    border-color: rgba(148, 163, 184, 0.25);
    color: var(--text-secondary);
    transform: translateY(-2px);
}

.pagination button.active {
    background: rgba(251, 191, 36, 0.2);
    color: var(--accent);
    border-color: rgba(251, 191, 36, 0.35);
}

.pagination button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.chart-surface {
    position: relative;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(148, 163, 184, 0.12);
    background: rgba(15, 23, 42, 0.6);
    padding: 2.5rem 2rem 2rem;
    min-height: 420px;
    overflow: hidden;
}

.bar-container {
    position: absolute;
    inset: 2.5rem 2rem 2.4rem 2.4rem;
    display: flex;
    align-items: flex-end;
    gap: max(6px, 0.6vw);
}

.chart-bar {
    flex: 1;
    min-width: 18px;
    border-radius: 10px 10px 0 0;
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.9) 0%, rgba(59, 130, 246, 0.45) 100%);
    position: relative;
    transition: transform var(--transition), opacity var(--transition), box-shadow var(--transition);
}

.chart-bar:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 28px rgba(59, 130, 246, 0.28);
}

.chart-bar.highlighted {
    background: linear-gradient(180deg, rgba(251, 191, 36, 0.95) 0%, rgba(234, 179, 8, 0.6) 100%);
}

.bar-tooltip {
    position: absolute;
    inset: auto auto calc(100% + 14px) 50%;
    transform: translateX(-50%);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-xs);
    background: rgba(15, 23, 42, 0.9);
    color: var(--text-primary);
    font-size: 0.85rem;
    white-space: nowrap;
    border: 1px solid rgba(148, 163, 184, 0.18);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
}

.chart-bar:hover .bar-tooltip {
    opacity: 1;
    transform: translate(-50%, -4px);
}

.loading {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(2, 6, 23, 0.82);
    backdrop-filter: blur(8px);
    z-index: 40;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.loading.show {
    opacity: 1;
    pointer-events: all;
}

.spinner {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    border: 4px solid rgba(148, 163, 184, 0.12);
    border-top-color: var(--accent);
    animation: spin 0.9s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.footer {
    padding: var(--spacing-md) 0 var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer .section {
    padding-block: 0;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer a {
    color: inherit;
}

.footer a:hover {
    color: var(--accent);
}

@media (max-width: 860px) {
    .header-inner {
        flex-wrap: wrap;
        justify-content: center;
    }

    .header-actions {
        width: 100%;
        justify-content: center;
    }

    .hero {
        text-align: left;
    }

    .hero p {
        text-align: left;
    }
}

@media (max-width: 640px) {
    .section {
        width: min(640px, calc(100% - 2rem));
        padding-block: var(--spacing-md);
    }

    .header-inner {
        width: min(640px, calc(100% - 2rem));
        padding: 0.85rem 0;
    }

    .card {
        padding: 1.5rem;
    }

    th,
    td {
        padding: 0.85rem 0.75rem;
        font-size: 0.9rem;
    }

    .brand::before {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
}