:root {
    --accent: #00d4aa;
    --accent-hover: #00b894;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
}

body {
    background-color: var(--bg-dark);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

.text-accent { color: var(--accent) !important; }
.bg-accent { background-color: var(--accent) !important; }

.btn-accent {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #000;
    font-weight: 600;
}
.btn-accent:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #000;
}

.card, .stat-card {
    background-color: var(--bg-card);
    border: 1px solid #2a2a3e;
    border-radius: 12px;
}

.stat-card {
    padding: 1.25rem;
    text-align: center;
    transition: transform 0.2s;
}
.stat-card:hover {
    transform: translateY(-2px);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
}

.stat-label {
    font-size: 0.85rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-delta {
    font-size: 0.9rem;
    font-weight: 600;
}

.chart-container {
    background-color: var(--bg-card);
    border: 1px solid #2a2a3e;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.chart-container h5 {
    color: #ccc;
    margin-bottom: 1rem;
}

.table-dark {
    --bs-table-bg: var(--bg-card);
}

.navbar-dark, .navbar.bg-dark {
    background-color: var(--bg-dark) !important;
}

.form-control, .form-select {
    background-color: #16213e;
    border-color: #2a2a3e;
    color: #fff;
}
.form-control:focus, .form-select:focus {
    background-color: #1a1a3e;
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 0 0 0.2rem rgba(0, 212, 170, 0.15);
}

.history-table td, .history-table th {
    vertical-align: middle;
    white-space: nowrap;
}

.badge-up { background-color: rgba(0, 212, 170, 0.2); color: var(--accent); }
.badge-down { background-color: rgba(255, 71, 87, 0.2); color: #ff4757; }

/* Filter buttons */
.filter-btn {
    min-width: 70px;
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
}

/* Mobile responsive */
@media (max-width: 576px) {
    .container { padding-left: 0.75rem; padding-right: 0.75rem; }

    .stat-card { padding: 0.75rem 0.5rem; }
    .stat-value { font-size: 1.4rem; }
    .stat-label { font-size: 0.7rem; }
    .stat-delta { font-size: 0.75rem; }

    .chart-container { padding: 1rem 0.75rem; }
    .chart-container h5 { font-size: 0.95rem; }

    .filter-btn { min-width: 50px; font-size: 0.7rem; padding: 0.25rem 0.5rem; }

    .history-table { font-size: 0.8rem; }
    .history-table td, .history-table th { padding: 0.4rem 0.3rem; }

    .navbar-brand { font-size: 1rem; }
    .nav-link { font-size: 0.85rem; padding: 0.3rem 0.5rem; }

    h2 { font-size: 1.3rem; }
    h5 { font-size: 1rem; }
}

@media (max-width: 768px) {
    .stat-value { font-size: 1.6rem; }

    .chart-container { padding: 1rem; }

    /* Stack charts full width on tablets */
    .col-md-6 { margin-bottom: 0.5rem; }
}