/* Room Presence Sensor - Modern Dark Theme */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2332;
    --text-primary: #f0f4f8;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-yellow: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #8b5cf6;
    --border-color: #2d3748;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 48px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2rem;
    line-height: 1.2;
    text-align: center;
    white-space: nowrap;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header h1 .title-line2 {
    display: block;
}

.logo {
    max-height: 96px;
    max-width: 100%;
    height: auto;
    width: auto;
    display: block;
    justify-self: end;
}

header .connection-status {
    justify-self: start;
    align-self: end;
}

.connection-status {
    font-size: 0.85rem;
    padding: 6px 12px;
    border-radius: 20px;
    background: var(--bg-card);
    color: var(--text-muted);
}

.connection-status.connected {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
}

.connection-status.disconnected {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
}

/* Main Status Panel */
.status-panel {
    text-align: center;
    padding: 40px 20px;
    background: var(--bg-card);
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.status-icon {
    width: 140px;
    height: 140px;
    margin: 0 auto 25px;
    position: relative;
}

.icon-ring {
    position: absolute;
    inset: 0;
    border: 4px solid var(--border-color);
    border-radius: 50%;
    transition: all 0.5s ease;
}

.icon-center {
    position: absolute;
    inset: 20px;
    background: var(--bg-secondary);
    border-radius: 50%;
    transition: all 0.5s ease;
}

/* Status States */
.status-panel.empty .icon-ring {
    border-color: var(--text-muted);
}
.status-panel.empty .icon-center {
    background: var(--bg-secondary);
}

.status-panel.present .icon-ring {
    border-color: var(--accent-blue);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}
.status-panel.present .icon-center {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
}

.status-panel.moving .icon-ring {
    border-color: var(--accent-green);
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.4);
    animation: pulse 1.5s ease-in-out infinite;
}
.status-panel.moving .icon-center {
    background: linear-gradient(135deg, var(--accent-green), #34d399);
}

.status-panel.calibrating .icon-ring {
    border-color: var(--accent-yellow);
    animation: spin 2s linear infinite;
}
.status-panel.calibrating .icon-center {
    background: var(--accent-yellow);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.status-text {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.status-detail {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Links Section */
.links-section {
    margin-bottom: 30px;
}

.links-section h2,
.chart-section h2,
.calibration-section h2,
.sensitivity-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
}

.link-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 18px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.link-card.active {
    border-color: var(--accent-blue);
}

.link-card.inactive {
    opacity: 0.5;
}

.link-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.link-name {
    font-size: 0.9rem;
    font-weight: 500;
}

.link-status {
    font-size: 0.75rem;
    padding: 3px 8px;
    border-radius: 10px;
    font-weight: 500;
}

.link-status.detecting {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
}

.link-status.idle {
    background: rgba(100, 116, 139, 0.15);
    color: var(--text-muted);
}

.link-status.offline {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
}

.link-metrics {
    display: flex;
    gap: 15px;
    margin-bottom: 12px;
}

.metric {
    flex: 1;
}

.metric-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 2px;
}

.metric-value {
    font-size: 0.95rem;
    font-weight: 600;
    font-family: 'SF Mono', Monaco, monospace;
}

.link-bar {
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    overflow: hidden;
}

.link-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* Per-Link Sensitivity Controls */
.link-sensitivity {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.sens-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.sens-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-blue);
}

.sens-current {
    font-size: 0.75rem;
    color: var(--accent-green);
    font-family: 'SF Mono', Monaco, monospace;
}

/* Label on its own line, slider + value below it.
 * The old single-row flex needed 120px label + 120px slider + 45px value +
 * gaps = ~310px, but a link card is only ~184px wide inside its padding at the
 * 220px grid minimum, and none of the three could shrink - so the slider ran
 * out past the card edge and the value was pushed out of sight. */
.sens-row {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
        "label label"
        "range value";
    align-items: center;
    gap: 6px 10px;
    margin-bottom: 14px;
}

.sens-label {
    grid-area: label;
    min-width: 0;
    font-size: 0.8rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.sens-label small {
    color: var(--text-muted);
    font-size: 0.65rem;
}

.sens-row input[type="range"] {
    grid-area: range;
    width: 100%;
    min-width: 0;      /* must be able to shrink inside a narrow card */
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(to right, var(--bg-secondary), var(--accent-blue));
    -webkit-appearance: none;
}

.sens-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.4);
    transition: transform 0.2s ease;
}

.sens-row input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.sens-row input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    cursor: pointer;
    border: none;
}

.sens-value {
    grid-area: value;
    min-width: 42px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'SF Mono', Monaco, monospace;
    color: var(--accent-purple);
    text-align: right;
}

.btn-apply {
    padding: 8px 20px;
    font-size: 0.85rem;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 5px;
}

.btn-apply:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-apply.success {
    background: var(--accent-green);
}

.link-note {
    margin-top: 12px;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 6px;
    text-align: center;
}

.link-note small {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Info Section */
.info-section {
    margin-bottom: 20px;
}

.info-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-box {
    background: var(--bg-card);
    border-radius: 8px;
    padding: 15px;
    border: 1px solid var(--border-color);
}

.info-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

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

.info-box strong {
    color: var(--accent-blue);
}

/* Chart Section */
.chart-section {
    margin-bottom: 30px;
}

.chart-container {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    height: 200px;
    border: 1px solid var(--border-color);
}

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

/* Calibration Section */
.calibration-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
}

.calibration-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.calibration-controls {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary.active {
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-red));
}

.calibration-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.calibration-countdown {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-yellow);
    font-family: 'SF Mono', Monaco, monospace;
}

.threshold-display {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 30px;
}

.threshold-item {
    flex: 1;
}

.threshold-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
}

.threshold-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-blue);
    font-family: 'SF Mono', Monaco, monospace;
}

/* Sensitivity Section */
.sensitivity-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.sensitivity-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.sensitivity-controls {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.sensitivity-slider {
    width: 100%;
}

.sensitivity-slider label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.sensitivity-slider label span {
    color: var(--accent-green);
    font-weight: 600;
    font-family: 'SF Mono', Monaco, monospace;
}

.sensitivity-slider input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--bg-secondary);
    outline: none;
    -webkit-appearance: none;
}

.sensitivity-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
    transition: transform 0.2s ease;
}

.sensitivity-slider input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.sensitivity-slider input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    cursor: pointer;
    border: none;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    align-self: flex-start;
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 30px;
}

/* Responsive */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    /* Phones: title on its own centered row, status + logo below it */
    header {
        grid-template-columns: 1fr 1fr;
        grid-template-areas:
            "title title"
            "status logo";
        gap: 10px;
    }

    header h1 {
        grid-area: title;
        font-size: 1.5rem;
    }

    header h1 .title-line2 {
        display: inline;
    }

    header .connection-status {
        grid-area: status;
    }

    header .logo {
        grid-area: logo;
    }

    .logo {
        max-height: 44px;
    }
    
    .status-icon {
        width: 100px;
        height: 100px;
    }
    
    .status-text {
        font-size: 1.4rem;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
}