:root {
    --bg: #0a0e17;
    --surface: #111827;
    --border: #1e293b;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --green: #22c55e;
    --red: #ef4444;
    --header-height: 50px;
    --controls-height: 50px;
    --footer-height: 40px;
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

body {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ── Header ── */
.header {
    height: var(--header-height);
    padding: 0 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

h1 {
    font-size: 1.2rem;
    color: var(--accent);
}

.header-right {
    display: flex;
    gap: 12px;
    align-items: center;
}

.status {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.status.connected { color: var(--green); }
.status.disconnected { color: var(--red); }

.retry-btn {
    background: var(--red);
    color: var(--text);
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    transition: opacity 0.2s;
}

.retry-btn:hover {
    opacity: 0.8;
}

.retry-btn.hidden {
    display: none;
}

/* ── Controls Bar ── */
.controls-bar {
    height: var(--controls-height);
    padding: 0 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
    overflow-x: auto;
    overflow-y: hidden;
}

.symbol-selector-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.symbol-selector-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 6px 10px;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
}

/* ── Timeframe Tabs ── */
.timeframe-tabs {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.tf-tab {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tf-tab:hover {
    background: var(--bg);
    color: var(--text);
}

.tf-tab.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* ── Chart Controls ── */
.chart-controls {
    display: flex;
    gap: 4px;
    margin-left: auto;
    flex-shrink: 0;
}

.control-btn {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: var(--bg);
    color: var(--text);
}

.control-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.control-btn .icon {
    font-size: 1rem;
}

/* ── Chart Wrapper ── */
.chart-wrapper {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#chartContainer {
    width: 100%;
    height: 100%;
}

/* ── Candle Info Panel ── */
.candle-info {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 0.8rem;
    z-index: 10;
    min-width: 180px;
    backdrop-filter: blur(4px);
}

.candle-info.hidden {
    display: none;
}

.info-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

.info-row:last-child {
    margin-bottom: 0;
}

.info-row .label {
    color: var(--text-muted);
    margin-right: 12px;
}

.info-row .value {
    color: var(--text);
    font-weight: 600;
}

.info-row .value.green {
    color: var(--green);
}

.info-row .value.red {
    color: var(--red);
}

/* ── Footer (Metrics) ── */
.footer {
    height: var(--footer-height);
    padding: 0 16px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 24px;
    flex-shrink: 0;
    overflow-x: auto;
    overflow-y: hidden;
}

.metric {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
}

.metric-label {
    color: var(--text-muted);
}

.metric-value {
    color: var(--text);
    font-weight: 600;
}

/* ── Mobile Responsive ── */
@media (max-width: 768px) {
    h1 {
        font-size: 1rem;
    }

    .header {
        padding: 0 12px;
    }

    .controls-bar {
        padding: 0 12px;
        gap: 12px;
        height: auto;
        min-height: var(--controls-height);
        flex-wrap: wrap;
    }

    .symbol-selector-group {
        flex-basis: 100%;
    }

    .timeframe-tabs {
        flex-wrap: wrap;
    }

    .chart-controls {
        margin-left: 0;
    }

    .footer {
        padding: 0 12px;
        gap: 16px;
        font-size: 0.75rem;
    }

    .candle-info {
        top: 8px;
        left: 8px;
        font-size: 0.75rem;
        padding: 8px 10px;
        min-width: 160px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 0.9rem;
    }

    .status {
        font-size: 0.75rem;
    }

    .tf-tab {
        padding: 5px 10px;
        font-size: 0.75rem;
    }

    .control-btn {
        padding: 5px 8px;
    }

    .footer {
        flex-wrap: wrap;
        height: auto;
        min-height: var(--footer-height);
        padding: 8px 12px;
    }

    .metric {
        font-size: 0.7rem;
    }
}

/* ── Utility Classes ── */
.hidden {
    display: none !important;
}