/* ============================================================
   CSS custom properties — light / dark via prefers-color-scheme
   ============================================================ */
:root {
    --bg:          #f0f9ff;
    --bg-card:     #ffffff;
    --bg-header:   #0e7490;
    --bg-controls: #e0f2fe;
    --text:        #0f172a;
    --text-muted:  #64748b;
    --text-header: #ffffff;
    --primary:     #0891b2;
    --primary-hover: #0e7490;
    --accent:      #22d3ee;
    --border:      #bae6fd;
    --shadow:      0 1px 3px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md:   0 4px 12px rgba(0,0,0,0.12);
    --radius:      10px;
    --radius-sm:   6px;
    --warn-bg:     #fef3c7;
    --warn-border: #f59e0b;
    --warn-text:   #78350f;
    --tooltip-bg:  #1e293b;
    --tooltip-text: #e2e8f0;
    --btn-active-bg: #0891b2;
    --btn-active-text: #ffffff;
    --btn-bg:      #ffffff;
    --btn-text:    #0f172a;
    --btn-border:  #bae6fd;
    --table-head:  #e0f2fe;
    --table-row-alt: #f0f9ff;
    --export-bg:   #0891b2;
    --export-text: #ffffff;
    --export-hover: #0e7490;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg:          #0c1a2e;
        --bg-card:     #162032;
        --bg-header:   #0c1a2e;
        --bg-controls: #162032;
        --text:        #e2e8f0;
        --text-muted:  #94a3b8;
        --text-header: #e2e8f0;
        --primary:     #22d3ee;
        --primary-hover: #06b6d4;
        --accent:      #0891b2;
        --border:      #1e3a5f;
        --shadow:      0 1px 3px rgba(0,0,0,0.4);
        --shadow-md:   0 4px 12px rgba(0,0,0,0.5);
        --warn-bg:     #451a03;
        --warn-border: #f59e0b;
        --warn-text:   #fde68a;
        --tooltip-bg:  #0f172a;
        --tooltip-text: #e2e8f0;
        --btn-active-bg: #22d3ee;
        --btn-active-text: #0c1a2e;
        --btn-bg:      #162032;
        --btn-text:    #e2e8f0;
        --btn-border:  #1e3a5f;
        --table-head:  #1e3a5f;
        --table-row-alt: #162032;
        --export-bg:   #22d3ee;
        --export-text: #0c1a2e;
        --export-hover: #06b6d4;
    }
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
    background: var(--bg-header);
    color: var(--text-header);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-md);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px 0;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 12px;
}

.header-title h1 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-header);
    letter-spacing: -0.01em;
}

.site-subtitle {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
    margin-top: 1px;
}

/* ============================================================
   Tab navigation
   ============================================================ */
.tab-nav {
    display: flex;
    gap: 2px;
    margin-left: auto;
    align-self: flex-end;
}

.tab-btn {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.75);
    padding: 10px 18px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.1);
    color: #ffffff;
}

.tab-btn.active {
    background: var(--bg);
    color: var(--primary);
    font-weight: 600;
}

/* ============================================================
   Main content
   ============================================================ */
.site-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 48px;
}

/* ============================================================
   Tab panes
   ============================================================ */
.tab-pane { display: block; }
.tab-pane.hidden { display: none; }

/* ============================================================
   Alert / warning banner
   ============================================================ */
.alert {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.alert-warn {
    background: var(--warn-bg);
    border: 1px solid var(--warn-border);
    color: var(--warn-text);
}

/* ============================================================
   Current conditions card grid
   ============================================================ */
.current-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(185px, 1fr));
    gap: 12px;
    margin-bottom: 8px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 14px 30px;
    box-shadow: var(--shadow);
    position: relative;
    transition: box-shadow 0.15s;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 6px;
    margin-bottom: 8px;
}

.card-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    line-height: 1.2;
    white-space: nowrap;
}

.card-body {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.card-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
    letter-spacing: -0.02em;
}

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

/* ============================================================
   Tooltip
   ============================================================ */
.tooltip-wrap {
    position: absolute;
    bottom: 8px;
    right: 10px;
    cursor: help;
}

.tooltip-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 17px;
    height: 17px;
    border-radius: 50%;
    background: var(--border);
    color: var(--text-muted);
    font-size: 11px;
    font-style: italic;
    font-weight: 700;
    user-select: none;
    transition: background 0.15s;
}

.tooltip-wrap:hover .tooltip-icon,
.tooltip-wrap:focus .tooltip-icon {
    background: var(--primary);
    color: #fff;
}

.tooltip-text {
    display: none;
    position: absolute;
    bottom: calc(100% + 6px);
    top: auto;
    right: 0;
    width: 220px;
    background: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    line-height: 1.45;
    z-index: 100;
    box-shadow: var(--shadow-md);
    pointer-events: none;
}

.tooltip-wrap:hover .tooltip-text,
.tooltip-wrap:focus .tooltip-text {
    display: block;
}

/* ============================================================
   Last updated / meta
   ============================================================ */
.last-updated {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 28px;
}

.no-data {
    color: var(--text-muted);
    font-style: italic;
    padding: 24px 0;
}

/* ============================================================
   Overview / chart sections
   ============================================================ */
.overview-section {
    margin-top: 8px;
}

.overview-section h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.chart-wrap {
    position: relative;
    height: 260px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    box-shadow: var(--shadow);
}

.chart-note {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 6px;
    font-style: italic;
}

/* ============================================================
   Controls bar (range selector + metric toggles)
   ============================================================ */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-start;
    background: var(--bg-controls);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 20px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.btn-group {
    display: flex;
    gap: 4px;
}

.range-btn {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    color: var(--btn-text);
    padding: 6px 14px;
    font-size: 0.825rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.12s, color 0.12s, border-color 0.12s;
}

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

.range-btn.active {
    background: var(--btn-active-bg);
    color: var(--btn-active-text);
    border-color: var(--btn-active-bg);
}

.metric-toggles {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text);
}

.toggle-label input[type="checkbox"] {
    accent-color: var(--primary);
    width: 15px;
    height: 15px;
    cursor: pointer;
}

.date-range-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.date-label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.83rem;
    color: var(--text);
}

.date-input {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 5px 8px;
    font-size: 0.83rem;
    cursor: pointer;
    color-scheme: light dark;
}

/* ============================================================
   Charts tab — chart blocks
   ============================================================ */
.chart-block {
    margin-bottom: 20px;
}

.chart-block h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.chart-block .chart-wrap {
    height: 280px;
}

/* ============================================================
   Table tab
   ============================================================ */
.table-scroll {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.83rem;
    background: var(--bg-card);
}

.data-table th {
    background: var(--table-head);
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 10px 12px;
    text-align: left;
    white-space: nowrap;
    border-bottom: 1px solid var(--border);
}

.data-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    color: var(--text);
}

.data-table tr:last-child td { border-bottom: none; }

.data-table tbody tr:nth-child(even) td {
    background: var(--table-row-alt);
}

.data-table tbody tr:hover td {
    background: var(--bg-controls);
}

.table-status {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-style: italic;
}

/* ============================================================
   Export button
   ============================================================ */
.btn-export {
    background: var(--export-bg);
    color: var(--export-text);
    border: none;
    padding: 8px 18px;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    align-self: flex-end;
    margin-left: auto;
    transition: background 0.12s;
}

.btn-export:hover { background: var(--export-hover); }

/* ============================================================
   Pagination
   ============================================================ */
.pagination {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-top: 16px;
    flex-wrap: wrap;
}

.page-btn {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    color: var(--btn-text);
    padding: 5px 11px;
    font-size: 0.825rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.12s;
}

.page-btn:hover { border-color: var(--primary); color: var(--primary); }

.page-btn.active {
    background: var(--btn-active-bg);
    color: var(--btn-active-text);
    border-color: var(--btn-active-bg);
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: default;
}

/* ============================================================
   Info tab
   ============================================================ */
.info-content {
    max-width: 680px;
    line-height: 1.7;
}

.info-content h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.info-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 24px 0 8px;
    color: var(--text);
}

.info-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.info-content h4 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin: 16px 0 8px;
}

/* ============================================================
   Uptime table (Info tab)
   ============================================================ */
.uptime-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    margin-bottom: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.uptime-table th {
    background: var(--table-head);
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 9px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.uptime-table td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.uptime-table tr:last-child td {
    border-bottom: none;
}

.uptime-good { color: #16a34a; font-weight: 600; }
.uptime-warn { color: #d97706; font-weight: 600; }
.uptime-bad  { color: #dc2626; font-weight: 600; }

.uptime-meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* ============================================================
   Utility
   ============================================================ */
.hidden { display: none !important; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 600px) {
    .header-inner { padding: 12px 16px 0; }
    .tab-btn { padding: 8px 12px; font-size: 0.8rem; }
    .site-main { padding: 16px 12px 40px; }
    .current-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
    .card-value { font-size: 1.4rem; }
    .controls-bar { padding: 12px; gap: 14px; }
    .btn-export { margin-left: 0; }
}