/* ============================================
   Sensor Dashboard — Modern Dark Theme
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0a12;
    --bg-secondary: #12121e;
    --bg-card: rgba(255, 255, 255, 0.025);
    --bg-card-hover: rgba(255, 255, 255, 0.04);
    --border-card: rgba(255, 255, 255, 0.06);
    --border-card-hover: rgba(255, 255, 255, 0.12);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --online: #22c55e;
    --online-glow: rgba(34, 197, 94, 0.2);
    --offline: #ef4444;
    --offline-glow: rgba(239, 68, 68, 0.2);
    --temp-freezing: #60a5fa;
    --temp-cold: #38bdf8;
    --temp-cool: #2dd4bf;
    --temp-comfortable: #4ade80;
    --temp-warm: #fbbf24;
    --temp-hot: #f87171;
    --humidity-start: #06b6d4;
    --humidity-end: #3b82f6;
    --radius-lg: 1rem;
    --radius-md: 0.75rem;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.4);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Subtle noise texture overlay */
.noise {
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

/* Background gradient */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(6, 182, 212, 0.05), transparent);
    pointer-events: none;
    z-index: 0;
}

/* --- Dashboard Layout --- */
.dashboard {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Header --- */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem 0 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

.title-icon {
    width: 28px;
    height: 28px;
    color: var(--accent);
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    font-weight: 400;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Language switch */
.lang-switch {
    display: flex;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 2rem;
    padding: 2px;
    gap: 2px;
}

.lang-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.55rem;
    border-radius: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.lang-btn:hover {
    color: var(--text-primary);
}

.lang-btn.active {
    background: rgba(99, 102, 241, 0.18);
    border-color: rgba(99, 102, 241, 0.4);
    color: #fff;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Refresh button */
.refresh-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 2rem;
    padding: 0.4rem 0.75rem 0.4rem 0.5rem;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-variant-numeric: tabular-nums;
}

.refresh-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.refresh-icon {
    width: 14px;
    height: 14px;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.refresh-icon.spinning {
    transform: rotate(360deg);
}

/* Status badge */
.status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 2rem;
    padding: 0.4rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.status-badge.all-online {
    border-color: rgba(34, 197, 94, 0.2);
    background: rgba(34, 197, 94, 0.06);
}

.status-badge .status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--offline);
}

.status-badge.all-online .status-dot {
    background: var(--online);
    box-shadow: 0 0 8px var(--online-glow);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* --- Main Content --- */
.main {
    flex: 1;
    padding-bottom: 2rem;
}

.sensor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
}

/* --- Sensor Cards --- */
.sensor-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
    animation: card-enter 0.5s cubic-bezier(0.4, 0, 0.2, 1) both;
}

@keyframes card-enter {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sensor-card:hover {
    border-color: var(--border-card-hover);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.sensor-card.card-offline {
    opacity: 0.55;
}

.sensor-card.card-offline:hover {
    opacity: 0.75;
}

/* Update flash */
.sensor-card.card-updated {
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 0 20px var(--accent-glow);
}

/* Status bar at the very top of the card */
.card-status-bar {
    height: 2px;
    width: 100%;
    transition: background 0.5s ease;
}

.card-status-bar.online {
    background: linear-gradient(90deg, transparent, var(--online), transparent);
}

.card-status-bar.offline {
    background: linear-gradient(90deg, transparent, var(--offline), transparent);
}

/* Card header */
.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 1.25rem 1.5rem 0;
}

.sensor-identity {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sensor-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.sensor-name {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.sensor-status {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.15rem;
}

.sensor-status.online {
    color: var(--online);
}

.sensor-status.offline {
    color: var(--offline);
}

.status-indicator {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    display: inline-block;
}

.sensor-status.online .status-indicator {
    background: var(--online);
    box-shadow: 0 0 6px var(--online-glow);
}

.sensor-status.offline .status-indicator {
    background: var(--offline);
}

.time-ago {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    white-space: nowrap;
    padding-top: 0.15rem;
}

/* Card body */
.card-body {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    gap: 1rem;
}

.reading {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.reading-label {
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

/* Temperature display */
.temperature-reading {
    flex: 1;
}

.reading-value {
    display: flex;
    align-items: baseline;
    gap: 0.15rem;
    line-height: 1;
}

.reading-value .value {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
}

.reading-value .unit {
    font-size: 1.25rem;
    font-weight: 400;
    opacity: 0.6;
}

/* Temperature color classes */
.temp-freezing .value { color: var(--temp-freezing); }
.temp-cold .value { color: var(--temp-cold); }
.temp-cool .value { color: var(--temp-cool); }
.temp-comfortable .value { color: var(--temp-comfortable); }
.temp-warm .value { color: var(--temp-warm); }
.temp-hot .value { color: var(--temp-hot); }
.temp-na .value { color: var(--text-muted); }

.temp-freezing .unit { color: var(--temp-freezing); }
.temp-cold .unit { color: var(--temp-cold); }
.temp-cool .unit { color: var(--temp-cool); }
.temp-comfortable .unit { color: var(--temp-comfortable); }
.temp-warm .unit { color: var(--temp-warm); }
.temp-hot .unit { color: var(--temp-hot); }

/* Divider */
.divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.06), transparent);
}

/* Humidity gauge */
.humidity-reading {
    align-items: center;
}

.humidity-gauge {
    position: relative;
    width: 80px;
    height: 80px;
}

.gauge-ring {
    width: 100%;
    height: 100%;
}

.gauge-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.05);
    stroke-width: 5;
}

.gauge-fill {
    fill: none;
    stroke-width: 5;
    stroke-linecap: round;
    transition: stroke-dasharray 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.gauge-center {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 0;
}

.gauge-center .value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.gauge-center .gauge-unit {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Card footer */
.card-footer {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 1.5rem 1rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-variant-numeric: tabular-nums;
}

.clock-icon {
    width: 12px;
    height: 12px;
    opacity: 0.5;
}

.timestamp {
    opacity: 0.7;
}

/* --- Footer --- */
.footer {
    padding: 1.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.footer-dot {
    opacity: 0.3;
}

.footer-tech {
    font-weight: 500;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .dashboard {
        padding: 0 1rem;
    }

    .header {
        padding: 1.5rem 0 1rem;
        margin-bottom: 1.5rem;
    }

    .title {
        font-size: 1.25rem;
    }

    .sensor-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .reading-value .value {
        font-size: 2.5rem;
    }

    .card-body {
        padding: 1.25rem;
    }
}

@media (max-width: 480px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-right {
        width: 100%;
        justify-content: flex-start;
    }
}

/* --- Accessibility: reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    .sensor-card {
        animation: none;
    }

    .sensor-card:hover {
        transform: none;
    }

    .refresh-icon.spinning {
        transform: none;
    }

    .status-badge.all-online .status-dot {
        animation: none;
    }
}