/* ===== Design Tokens ===== */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a1f35;
    --bg-card-hover: #222845;
    --bg-highlight: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.08));
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-card: rgba(255, 255, 255, 0.08);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-indigo: #6366f1;
    --accent-violet: #8b5cf6;
    --accent-red: #ef4444;
    --accent-red-soft: rgba(239, 68, 68, 0.15);
    --accent-green: #22c55e;
    --accent-green-soft: rgba(34, 197, 94, 0.15);
    --accent-blue: #3b82f6;
    --accent-blue-soft: rgba(59, 130, 246, 0.15);
    --accent-purple: #a78bfa;
    --accent-purple-soft: rgba(167, 139, 250, 0.12);
    --accent-amber: #f59e0b;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.4), 0 2px 6px rgba(0, 0, 0, 0.25);
    --shadow-header: 0 8px 32px rgba(0, 0, 0, 0.35);
    --transition-default: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Sora', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.14) transparent;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Custom scrollbar (WebKit) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    border: 2px solid var(--bg-primary);
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.22);
    background-clip: padding-box;
}

/* Text selection */
::selection {
    background: rgba(99, 102, 241, 0.4);
    color: #ffffff;
}

/* Keyboard focus */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-indigo);
    outline-offset: 2px;
    border-radius: 6px;
}

/* Background grid pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px 32px;
    transition: background var(--transition-default), box-shadow var(--transition-default);
}

.header.scrolled {
    background: rgba(10, 14, 26, 0.92);
    box-shadow: var(--shadow-header);
}

.header-content {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 14px;
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-default);
    white-space: nowrap;
    flex-shrink: 0;
}

.back-link:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

.logo-icon {
    flex-shrink: 0;
    filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.4));
}

.header h1 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 2px;
}

.header-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.data-source-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    background: rgba(99, 102, 241, 0.08);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-green);
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.last-update {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

/* ===== KPI Section ===== */
.kpi-section {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 28px auto 0;
    padding: 0 32px;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    transition: all var(--transition-default);
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-indigo), transparent);
    opacity: 0;
    transition: opacity var(--transition-default);
}

.kpi-card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
    border-color: rgba(99, 102, 241, 0.2);
}

.kpi-card:hover::before {
    opacity: 1;
}

.kpi-card.highlight-card {
    background: var(--bg-highlight);
    border-color: rgba(139, 92, 246, 0.2);
}

.kpi-card.highlight-card::before {
    background: linear-gradient(90deg, var(--accent-indigo), var(--accent-violet), var(--accent-indigo));
    opacity: 1;
}

.kpi-card.highlight-card .kpi-value {
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.kpi-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 12px;
}

.kpi-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-weight: 500;
    line-height: 1.4;
}

.kpi-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition-default);
}

.kpi-card:hover .kpi-icon {
    transform: scale(1.08);
}

.kpi-icon-red { background: var(--accent-red-soft); color: var(--accent-red); }
.kpi-icon-green { background: var(--accent-green-soft); color: var(--accent-green); }
.kpi-icon-blue { background: var(--accent-blue-soft); color: var(--accent-blue); }
.kpi-icon-purple { background: var(--accent-purple-soft); color: var(--accent-purple); }

.kpi-value {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
}

.kpi-change {
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    transition: background var(--transition-default), color var(--transition-default);
}

.kpi-change:empty {
    display: none;
}

.kpi-change.positive { color: var(--accent-green); background: var(--accent-green-soft); }
.kpi-change.negative { color: var(--accent-red); background: var(--accent-red-soft); }

.kpi-formula {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}

/* ===== Chart Sections ===== */
.chart-section {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 24px auto 0;
    padding: 0 32px;
}

.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-xl);
    padding: 28px 30px;
    box-shadow: var(--shadow-card);
    transition: box-shadow var(--transition-default), border-color var(--transition-default);
}

.chart-container:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(255, 255, 255, 0.11);
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.chart-header h2 {
    font-family: var(--font-display);
    font-size: 1.08rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.chart-subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.chart-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.range-btn {
    font-family: var(--font-main);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    background: transparent;
    border: none;
    padding: 7px 14px;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-default);
}

.range-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.range-btn.active {
    color: var(--text-primary);
    background: var(--accent-indigo);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

.chart-area {
    width: 100%;
    height: 480px;
}

.chart-area-sm {
    width: 100%;
    height: 360px;
}

.chart-area-lg {
    width: 100%;
    height: 560px;
}

/* ===== Comparison Chart Special ===== */
.comparison-container {
    border-color: rgba(139, 92, 246, 0.15);
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(139, 92, 246, 0.03) 100%);
    position: relative;
}

.comparison-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-violet), var(--accent-amber), transparent);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.chart-legend-hint {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.78rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
}

.legend-dot-purple { background: var(--accent-purple); box-shadow: 0 0 6px rgba(167, 139, 250, 0.5); }
.legend-dot-amber { background: var(--accent-amber); box-shadow: 0 0 6px rgba(245, 158, 11, 0.5); }

/* ===== Insight Bar ===== */
.insight-bar {
    display: flex;
    gap: 12px;
    margin-top: 18px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
}

.insight-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex: 1;
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.5;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-default);
}

.insight-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.insight-item strong {
    color: var(--text-primary);
}

.insight-icon {
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ===== Info Section ===== */
.info-section {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 32px auto 0;
    padding: 0 32px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 26px 24px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-default);
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(99, 102, 241, 0.15);
}

.info-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: -0.01em;
}

.info-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.info-card ul {
    list-style: none;
    padding: 0;
}

.info-card li {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.7;
    padding: 5px 0 5px 18px;
    position: relative;
}

.info-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 13px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-indigo);
}

.info-card li strong {
    color: var(--text-primary);
    font-weight: 600;
}

.info-card code {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent-purple);
    padding: 2px 6px;
    border-radius: 5px;
    word-break: break-all;
}

/* ===== Footer ===== */
.footer {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 40px auto 0;
    padding: 28px 32px 40px;
    text-align: center;
    border-top: 1px solid var(--border-subtle);
}

.footer p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.footer a {
    color: var(--accent-indigo);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-default);
}

.footer a:hover {
    color: var(--accent-violet);
    text-decoration: underline;
}

.disclaimer {
    margin-top: 8px;
    font-size: 0.72rem !important;
    opacity: 0.7;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
    .info-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .header { padding: 12px 16px; }
    .header-content { flex-direction: column; align-items: flex-start; gap: 12px; }
    .header-meta { flex-wrap: wrap; }
    .kpi-section, .chart-section, .info-section, .footer { padding-left: 16px; padding-right: 16px; }
    .kpi-grid { grid-template-columns: 1fr; }
    .info-grid { grid-template-columns: 1fr; }
    .chart-area { height: 360px; }
    .chart-area-sm { height: 280px; }
    .chart-area-lg { height: 420px; }
    .chart-container { padding: 20px 16px; }
    .chart-header { flex-direction: column; align-items: flex-start; }
    .chart-legend-hint { flex-direction: column; align-items: flex-start; gap: 6px; }
    .insight-bar { flex-direction: column; gap: 6px; }
    .kpi-value { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .header h1 { font-size: 1rem; }
    .subtitle { font-size: 0.68rem; }
    .data-source-badge { font-size: 0.7rem; padding: 5px 10px; }
    .kpi-card { padding: 18px; }
    .chart-area { height: 300px; }
    .chart-area-sm { height: 240px; }
    .chart-area-lg { height: 360px; }
    .range-btn { padding: 6px 11px; font-size: 0.74rem; }
}

/* ===== Loading Animation ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.kpi-card, .chart-container, .info-card {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}

.kpi-card:nth-child(1) { animation-delay: 0.05s; }
.kpi-card:nth-child(2) { animation-delay: 0.1s; }
.kpi-card:nth-child(3) { animation-delay: 0.15s; }
.kpi-card:nth-child(4) { animation-delay: 0.2s; }

.chart-section:nth-of-type(1) .chart-container { animation-delay: 0.25s; }
.chart-section:nth-of-type(2) .chart-container { animation-delay: 0.3s; }
.chart-section:nth-of-type(3) .chart-container { animation-delay: 0.35s; }
.chart-section:nth-of-type(4) .chart-container { animation-delay: 0.4s; }

.info-card:nth-child(1) { animation-delay: 0.4s; }
.info-card:nth-child(2) { animation-delay: 0.45s; }
.info-card:nth-child(3) { animation-delay: 0.5s; }

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}