:root {
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-header: #0f172a;
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --accent: #3b82f6;
    --accent-light: #dbeafe;
    --green: #22c55e;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.08);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a;
        --bg-card: #1e293b;
        --bg-header: #020617;
        --text: #e2e8f0;
        --text-muted: #94a3b8;
        --text-light: #64748b;
        --border: #334155;
        --accent: #60a5fa;
        --accent-light: #1e3a5f;
        --shadow: 0 1px 3px rgba(0,0,0,0.3);
        --shadow-lg: 0 4px 12px rgba(0,0,0,0.3);
    }
}

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

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.site-header {
    background: var(--bg-header);
    color: #fff;
    padding: 20px 0;
    margin-bottom: 32px;
}

.site-header .container {
    display: flex;
    align-items: center;
    gap: 16px;
}

.back-link {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: color 0.15s;
}

.back-link:hover {
    color: #fff;
}

.site-title {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    flex: 1;
}

.header-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.6);
    white-space: nowrap;
}

.live-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.org-section {
    margin-bottom: 36px;
}

.org-header-link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
    padding-bottom: 10px;
    margin-bottom: 16px;
    border-bottom: 2px solid var(--border);
    transition: border-color 0.15s;
}

.org-header-link:hover {
    border-bottom-color: var(--accent);
}

.org-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    flex: 1;
}

.org-arrow {
    font-size: 1.2rem;
    color: var(--text-light);
    transition: color 0.15s, transform 0.15s;
}

.org-header-link:hover .org-arrow {
    color: var(--accent);
    transform: translateX(3px);
}

.sensor-overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.sensor-overview-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 16px;
    box-shadow: var(--shadow);
}

.sensor-overview-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.sensor-overview-value {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.sensor-overview-value .val {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

.sensor-overview-value .unit {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.sensor-overview-time {
    font-size: 0.68rem;
    color: var(--text-light);
    margin-top: 4px;
}

.sensor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.sensor-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s;
}

.sensor-card:hover {
    box-shadow: var(--shadow-lg);
}

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

.sensor-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.sensor-type {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: var(--accent-light);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}

.sensor-value-row {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 4px;
}

.sensor-value {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    line-height: 1.2;
}

.sensor-unit {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

.sensor-updated {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 16px;
}

.sensor-chart-container {
    margin-top: 12px;
}

.chart-controls {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.range-btn {
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.range-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.range-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.chart-wrapper {
    position: relative;
    height: 160px;
}

.chart-wrapper canvas {
    width: 100% !important;
    height: 100% !important;
}

.empty-state {
    text-align: center;
    padding: 80px 24px;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    padding: 24px;
}

.error-page h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.error-page p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

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

.site-footer {
    margin-top: 60px;
    padding: 24px 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

.site-footer p {
    color: var(--text-light);
    font-size: 0.8rem;
}

@media (max-width: 640px) {
    .sensor-grid {
        grid-template-columns: 1fr;
    }

    .sensor-overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .site-header .container {
        flex-wrap: wrap;
    }

    .site-title {
        font-size: 1.1rem;
    }

    .sensor-value {
        font-size: 1.6rem;
    }

    .sensor-overview-value .val {
        font-size: 1.3rem;
    }

    .container {
        padding: 0 16px;
    }
}