/* === Base & Variables === */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--entry, #f8f9fa);
    color: var(--primary, #2d3748);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

/* === Header === */
.site-header {
    background: var(--surface-2, #fff);
    border-bottom: 1px solid var(--border, #e2e8f0);
    padding: 12px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--secondary, #718096);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

.back-link:hover { color: var(--accent, #667eea); }

.brand-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary, #2d3748);
}

.brand-subtitle {
    font-size: 12px;
    color: var(--secondary, #718096);
    margin-left: 8px;
}

.main-nav {
    display: flex;
    gap: 8px;
}

.nav-item {
    padding: 6px 14px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    color: var(--secondary, #718096);
    transition: all 0.2s;
}

.nav-item:hover { background: var(--surface-3, #f1f5f9); color: var(--primary, #2d3748); }
.nav-item.active { background: var(--accent, #667eea); color: #fff; }

/* === Hero === */
.hero-section {
    text-align: center;
    padding: 32px 0 24px;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.page-subtitle {
    font-size: 14px;
    color: var(--secondary, #718096);
}

/* === Sections === */
.section {
    margin-top: 28px;
}

.section-header {
    margin-bottom: 14px;
}

.section-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.section-hint {
    font-size: 13px;
    color: var(--secondary, #718096);
    margin-top: 2px;
}

/* === Cards Grid === */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 12px;
}

.stat-card {
    background: var(--surface-2, #fff);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 10px;
    padding: 14px 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.stat-card.active {
    border-color: var(--accent, #667eea);
    box-shadow: 0 0 0 2px rgba(102,126,234,0.2);
}

.stat-card.warning {
    border-color: #ed8936;
    background: rgba(237,137,54,0.05);
}

.stat-card.alert {
    border-color: #e53e3e;
    background: rgba(229,62,62,0.05);
}

.card-name {
    font-size: 12px;
    color: var(--secondary, #718096);
    font-weight: 500;
    margin-bottom: 4px;
}

.card-price {
    font-size: 22px;
    font-weight: 700;
}

.card-change {
    font-size: 13px;
    font-weight: 500;
    margin-top: 2px;
}

.card-change.up { color: #38a169; }
.card-change.down { color: #e53e3e; }

.card-sigma {
    font-size: 11px;
    color: var(--secondary, #718096);
    margin-top: 4px;
}

/* === Controls === */
.controls {
    display: flex;
    gap: 10px;
    margin-bottom: 14px;
}

.controls select {
    padding: 7px 12px;
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 6px;
    background: var(--surface-2, #fff);
    color: var(--primary, #2d3748);
    font-size: 13px;
    cursor: pointer;
}

/* === Chart === */
.chart-container {
    background: var(--surface-2, #fff);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 10px;
    padding: 16px;
    overflow-x: auto;
}

.chart-container canvas {
    max-height: 380px;
}

/* === Stats Grid === */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin-top: 14px;
}

.stats-item {
    background: var(--surface-2, #fff);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 8px;
    padding: 10px 14px;
    text-align: center;
}

.stats-label {
    font-size: 11px;
    color: var(--secondary, #718096);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stats-value {
    font-size: 16px;
    font-weight: 600;
    margin-top: 2px;
}

/* === Compare Toggles === */
.compare-toggles {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
}

.toggle-btn {
    padding: 5px 12px;
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 16px;
    background: var(--surface-2, #fff);
    color: var(--secondary, #718096);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn:hover {
    border-color: var(--accent, #667eea);
    color: var(--primary, #2d3748);
}

.toggle-btn.active {
    background: var(--accent, #667eea);
    color: #fff;
    border-color: var(--accent, #667eea);
}

/* === Footer === */
.page-footer {
    text-align: center;
    padding: 24px 0;
    margin-top: 32px;
    border-top: 1px solid var(--border, #e2e8f0);
    font-size: 12px;
    color: var(--secondary, #718096);
}

.page-footer p + p { margin-top: 4px; }

/* === Responsive === */
@media (max-width: 760px) {
    .main-nav { display: none; }
    .page-title { font-size: 22px; }
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
    .chart-container canvas { max-height: 260px; }
    .stats-grid { grid-template-columns: repeat(3, 1fr); }
}