:root {
    --primary: rgb(30, 75, 105);
    --accent: rgb(70, 180, 200);
    --light-bg: #f5f7fa;
    --border: #dde2e8;
    --text: #2c3e50;
    --text-light: #6c7a89;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--light-bg);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 820px;
    margin: 0 auto;
    padding: 24px 20px;
}

h2 { color: var(--primary); font-size: 1.5rem; margin-bottom: 4px; }
.subtitle { color: var(--text-light); font-size: 0.9rem; margin-bottom: 16px; }

/* Controls */
.controls-row {
    display: flex;
    gap: 16px;
    margin-bottom: 14px;
}

.slider-group {
    flex: 1;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: var(--shadow);
}

.slider-group label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 8px;
}

.slider-label { font-weight: 600; font-size: 0.85rem; color: var(--primary); }
.slider-value { font-size: 0.82rem; color: var(--accent); font-weight: 600; }

.slider-group input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid white;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    cursor: pointer;
}

.slider-group input[type="range"]::-moz-range-thumb {
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid white;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    cursor: pointer;
}

.slider-range {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* Canvas */
#canvas-container {
    margin-bottom: 14px;
    border-radius: var(--radius);
    overflow: hidden;
}

#canvas-container canvas { display: block; }

/* Nines Badge */
.nines-badge-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.nines-badge {
    display: inline-block;
    padding: 5px 16px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
    color: white;
    background: var(--success-color);
    transition: background 0.3s;
}

.nines-pct {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Downtime Cards */
.downtime-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.dt-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    text-align: center;
    box-shadow: var(--shadow);
}

.dt-icon { font-size: 1.2rem; margin-bottom: 2px; }
.dt-label { font-size: 0.72rem; color: var(--text-light); margin-bottom: 4px; }

.dt-value {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--primary);
    font-family: 'SF Mono', 'Fira Code', monospace;
    transition: color 0.3s;
}

.dt-value.danger { color: var(--danger-color); }
.dt-value.warning { color: var(--warning-color); }
.dt-value.good { color: var(--success-color); }

/* SLA Panel */
.sla-panel {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    box-shadow: var(--shadow);
}

.sla-panel h4 { color: var(--primary); font-size: 0.9rem; margin-bottom: 8px; }
.sla-panel p { font-size: 0.85rem; color: var(--text); line-height: 1.6; }

/* Responsive */
@media (max-width: 600px) {
    .controls-row { flex-direction: column; }
    .downtime-cards { grid-template-columns: repeat(2, 1fr); }
}