:root {
    --bg-base: #0b0f19;
    --bg-surface: #111827;
    --bg-card: #172033;
    --bg-subtle: #1e293b;
    --border-color: #2b3952;
    --border-hover: #3b82f6;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-glow: rgba(59, 130, 246, 0.35);
    --cyan: #06b6d4;
    --cyan-glow: rgba(6, 182, 212, 0.3);
    --purple: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(139, 92, 246, 0.06) 0%, transparent 40%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 20px 16px;
}

.container {
    width: 100%;
    max-width: 940px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin: auto 0;
}

header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
}

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

.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary), var(--cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 14px var(--primary-glow);
}

.brand-logo svg {
    width: 20px;
    height: 20px;
    fill: #fff;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-subtitle {
    font-size: 11px;
    color: var(--text-dim);
    font-weight: 500;
}

.badge-live {
    font-size: 10px;
    background: rgba(6, 182, 212, 0.15);
    color: var(--cyan);
    border: 1px solid rgba(6, 182, 212, 0.35);
    padding: 2px 7px;
    border-radius: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.edge-status {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-surface);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
    animation: pulse-dot 2s infinite;
}

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

.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px 16px;
    flex-wrap: wrap;
    gap: 10px;
}

.mode-toggle {
    display: flex;
    background: var(--bg-subtle);
    border-radius: 8px;
    padding: 3px;
    gap: 4px;
    border: 1px solid var(--border-color);
}

.mode-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 6px 13px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.mode-btn:hover {
    color: #fff;
}

.mode-btn.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px var(--primary-glow);
}

.session-info {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--text-muted);
}

.session-timer {
    font-family: ui-monospace, monospace;
    font-weight: 600;
    color: #fff;
    background: var(--bg-subtle);
    padding: 3px 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.chart-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chart-legend {
    display: flex;
    align-items: center;
    gap: 14px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    text-transform: none;
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.canvas-container {
    position: relative;
    width: 100%;
    height: 170px;
    background: #080c14;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
}

@media (max-width: 860px) {
    .metrics-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 520px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.metric-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.metric-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.metric-val-wrap {
    display: flex;
    align-items: baseline;
    gap: 3px;
}

.metric-value {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.5px;
}

.metric-unit {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-dim);
}

.grade-badge {
    display: inline-block;
    font-size: 18px;
    font-weight: 800;
    padding: 1px 12px;
    border-radius: 8px;
    color: #fff;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
}

.grade-A { background: rgba(16, 185, 129, 0.2); color: #34d399; border-color: rgba(16, 185, 129, 0.4); }
.grade-B { background: rgba(59, 130, 246, 0.2); color: #60a5fa; border-color: rgba(59, 130, 246, 0.4); }
.grade-C { background: rgba(245, 158, 11, 0.2); color: #fbbf24; border-color: rgba(245, 158, 11, 0.4); }
.grade-F { background: rgba(239, 68, 68, 0.2); color: #f87171; border-color: rgba(239, 68, 68, 0.4); }

.btn-container {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-top: 2px;
}

.action-btn {
    background: linear-gradient(135deg, var(--primary), var(--cyan));
    color: #fff;
    border: none;
    padding: 13px 42px;
    font-size: 14px;
    font-weight: 700;
    border-radius: 30px;
    cursor: pointer;
    box-shadow: 0 4px 20px var(--primary-glow);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 26px rgba(59, 130, 246, 0.5);
}

.action-btn.stop {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
}

.action-btn.stop:hover {
    box-shadow: 0 6px 26px rgba(239, 68, 68, 0.6);
}

.log-box {
    background: #080c14;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 11px;
    color: #94a3b8;
    max-height: 96px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.log-row {
    display: flex;
    gap: 8px;
    line-height: 1.4;
}

.log-time {
    color: #475569;
    flex-shrink: 0;
}

.log-tag {
    font-weight: 700;
    flex-shrink: 0;
}

.log-tag.session { color: #38bdf8; }
.log-tag.stream { color: #a855f7; }
.log-tag.worker { color: #34d399; }
.log-tag.system { color: #f59e0b; }

footer {
    width: 100%;
    max-width: 940px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--text-dim);
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 8px;
}

.footer-tech {
    font-family: ui-monospace, monospace;
}