/* Heat Pump Monitor — Dashboard */

:root {
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-secondary: #64748b;
    --color-text-tertiary: #94a3b8;
    --color-border: #e2e8f0;
    --color-accent: #3b82f6;
    --color-accent-soft: #eff6ff;
    --color-green: #22c55e;
    --color-green-soft: #f0fdf4;
    --color-green-text: #15803d;
    --color-red: #ef4444;
    --color-red-soft: #fef2f2;
    --color-red-text: #b91c1c;
    --color-amber: #f59e0b;
    --color-amber-soft: #fffbeb;
    --color-amber-text: #b45309;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.04), 0 1px 3px rgba(15,23,42,.06);
    --shadow-md: 0 2px 4px rgba(15,23,42,.04), 0 4px 12px rgba(15,23,42,.06);
    --shadow-focus: 0 0 0 3px rgba(59,130,246,.25);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
}

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

html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
}

/* ---- Layout ---- */

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 20px calc(24px + var(--safe-bottom));
    padding-top: calc(24px + var(--safe-top));
    padding-left: calc(20px + var(--safe-left));
    padding-right: calc(20px + var(--safe-right));
}

/* ---- Header ---- */

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 28px;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.header-logo {
    flex-shrink: 0;
    color: var(--color-accent);
}

.header h1 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.last-update {
    font-size: 12px;
    color: var(--color-text-tertiary);
    white-space: nowrap;
}

/* Connection badge */

.conn-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    transition: background .2s, color .2s;
}

.conn-badge::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
}

.conn-badge.online {
    background: var(--color-green-soft);
    color: var(--color-green-text);
}

.conn-badge.online::before {
    background: var(--color-green);
    box-shadow: 0 0 0 2px rgba(34,197,94,.3);
}

.conn-badge.offline {
    background: var(--color-red-soft);
    color: var(--color-red-text);
}

.conn-badge.offline::before {
    background: var(--color-red);
}

/* ---- Stats row ---- */

.stats-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.stat-card {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    box-shadow: var(--shadow-sm);
}

.stat-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
}

/* ---- Sections ---- */

.section {
    margin-bottom: 28px;
}

.section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-tag {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-accent-soft);
    padding: 2px 8px;
    border-radius: 100px;
    text-transform: none;
    letter-spacing: 0;
}

/* ---- Device grid ---- */

.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
}

.device-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: box-shadow .15s, border-color .15s;
    -webkit-tap-highlight-color: transparent;
}

.device-card:hover {
    box-shadow: var(--shadow-md);
}

.device-card:active {
    box-shadow: var(--shadow-sm);
}

.device-card.selected {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-focus);
}

.device-card.offline {
    opacity: .55;
}

.device-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.device-name {
    font-size: 14px;
    font-weight: 600;
}

.device-status {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 100px;
}

.device-status.online {
    background: var(--color-green-soft);
    color: var(--color-green-text);
}

.device-status.offline {
    background: var(--color-red-soft);
    color: var(--color-red-text);
}

.device-info {
    font-size: 12px;
    color: var(--color-text-tertiary);
    line-height: 1.4;
}

/* ---- Reading cards ---- */

.readings-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 16px 0;
}

.card-icon {
    color: var(--color-text-tertiary);
    flex-shrink: 0;
}

.card-header h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.card-body {
    padding: 10px 16px 14px;
}

/* Individual reading row */

.reading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 7px 0;
}

.reading + .reading {
    border-top: 1px solid var(--color-border);
}

.reading-label {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.reading-value-group {
    display: flex;
    align-items: baseline;
    gap: 3px;
}

.reading-value-group .value {
    font-size: 18px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--color-text);
    transition: color .2s;
}

.reading-unit {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-tertiary);
}

/* Value threshold states */

.value.warning {
    color: var(--color-amber-text) !important;
}

.value.critical {
    color: var(--color-red-text) !important;
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
    .container {
        padding: 16px 16px calc(16px + var(--safe-bottom));
        padding-top: calc(16px + var(--safe-top));
        padding-left: calc(16px + var(--safe-left));
        padding-right: calc(16px + var(--safe-right));
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        margin-bottom: 20px;
    }

    .header-meta {
        width: 100%;
        justify-content: space-between;
    }

    .stats-row,
    .section {
        margin-bottom: 20px;
    }

    .readings-grid {
        grid-template-columns: 1fr;
    }

    .device-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 16px;
    }

    .stat-value {
        font-size: 24px;
    }

    .stat-card {
        padding: 14px 16px;
    }
}