:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --accent: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #0f172a;
    --navy: #1a1a2e;
    --navy-light: #16213e;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08);
    --radius: 10px;
    --radius-sm: 6px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--gray-50);
}

/* Header */
.header {
    background: var(--navy);
    color: var(--white);
    padding: .75rem 0;
    box-shadow: var(--shadow);
    position: sticky; top: 0; z-index: 1000;
}
.header-inner { display: flex; justify-content: space-between; align-items: center; }
.brand { color: var(--white); text-decoration: none; font-size: 1.35rem; font-weight: 700; }
.nav { display: flex; gap: 1rem; }
.nav-link {
    color: rgba(255,255,255,.7); text-decoration: none;
    padding: .4rem .9rem; border-radius: var(--radius-sm);
    font-size: .9rem; transition: all .15s;
}
.nav-link:hover { color: var(--white); background: rgba(255,255,255,.1); }
.nav-link.active { color: var(--white); background: var(--primary); }

/* Layout */
.container { max-width: 1280px; margin: 0 auto; padding: 0 1.25rem; }
.main-content { padding: 1.5rem 1.25rem 3rem; }
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; flex-wrap: wrap; gap: .75rem; }
.page-header h2 { font-size: 1.75rem; font-weight: 700; }
.subtitle { color: var(--gray-500); font-size: .85rem; font-family: monospace; }

/* Cards */
.card {
    background: var(--white); border-radius: var(--radius);
    padding: 1.25rem; box-shadow: var(--shadow-sm);
    margin-bottom: 1.25rem;
}
.card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: .75rem; }
.card-row {
    display: flex; flex-wrap: wrap; gap: 1rem;
}

/* Stat cards */
.stat-card {
    flex: 1 1 140px;
    background: var(--white); border-radius: var(--radius); padding: 1rem;
    box-shadow: var(--shadow-sm); text-align: center;
}
.stat-card.mini { background: var(--gray-50); box-shadow: none; }
.stat-label { font-size: .75rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: .04em; margin-bottom: .35rem; }
.stat-value { font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.stat-value.status-online { color: var(--accent); }
.stat-value.status-stale { color: var(--warning); }
.stat-value.status-offline { color: var(--danger); }
.stat-value.status-unknown { color: var(--gray-400); }

/* Devices grid */
.devices-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.device-card {
    background: var(--white); border-radius: var(--radius);
    padding: 1.25rem; box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: transform .15s, box-shadow .15s;
}
.device-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.device-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: .75rem; }
.device-name { font-size: 1.05rem; font-weight: 600; }
.device-id { font-size: .7rem; color: var(--gray-500); font-family: monospace; }

/* Status dots */
.status-dot {
    display: inline-block; width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0;
}
.status-dot.status-online { background: var(--accent); box-shadow: 0 0 6px var(--accent); }
.status-dot.status-stale { background: var(--warning); box-shadow: 0 0 6px var(--warning); }
.status-dot.status-offline { background: var(--danger); box-shadow: 0 0 6px var(--danger); }
.status-dot.status-unknown { background: var(--gray-400); }

/* Device info */
.device-info { margin-bottom: .75rem; }
.info-row { display: flex; justify-content: space-between; padding: .4rem 0; border-bottom: 1px solid var(--gray-100); font-size: .85rem; }
.info-row:last-child { border-bottom: none; }
.info-row .label { color: var(--gray-500); }
.info-row .value { color: var(--gray-700); font-weight: 500; }
.info-row .value.msg { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.info-row.highlight .value { color: var(--primary); font-weight: 600; }
.device-actions { margin-top: .5rem; }

/* Buttons */
.btn {
    display: inline-block; padding: .55rem 1.1rem; border: none;
    border-radius: var(--radius-sm); font-size: .85rem; font-weight: 500;
    cursor: pointer; text-decoration: none; text-align: center; transition: all .15s;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); border: 1px solid var(--gray-200); }
.btn-secondary:hover { background: var(--gray-200); }
.btn-sm { padding: .35rem .7rem; font-size: .8rem; }

/* Modal */
.modal {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.45); z-index: 200;
    align-items: center; justify-content: center;
}
.modal.active { display: flex; }
.modal-content {
    background: var(--white); border-radius: var(--radius);
    width: 90%; max-width: 480px; max-height: 90vh; overflow-y: auto;
    box-shadow: var(--shadow-lg);
}
.modal-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.25rem; border-bottom: 1px solid var(--gray-200);
}
.modal-header h3 { margin: 0; font-size: 1.15rem; }
.modal-close {
    background: none; border: none; font-size: 1.5rem;
    cursor: pointer; color: var(--gray-400); width: 2rem; height: 2rem;
    display: flex; align-items: center; justify-content: center;
    border-radius: var(--radius-sm);
}
.modal-close:hover { background: var(--gray-100); }
.modal form { padding: 1.25rem; }
.modal-actions { display: flex; gap: .75rem; justify-content: flex-end; margin-top: 1.25rem; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group label { display: block; margin-bottom: .35rem; font-weight: 500; font-size: .85rem; }
.form-group input {
    width: 100%; padding: .55rem; border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm); font-size: .85rem; transition: border-color .15s;
}
.form-group input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.12); }

/* Messages */
.error-msg { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; padding: .75rem; border-radius: var(--radius-sm); font-size: .85rem; margin-bottom: .75rem; }
.success-msg { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; padding: .75rem; border-radius: var(--radius-sm); font-size: .85rem; margin-bottom: .75rem; }
.warning { color: var(--warning); font-size: .8rem; margin-top: .5rem; }
.api-key-box {
    background: var(--gray-50); padding: .75rem; border-radius: var(--radius-sm);
    margin: .5rem 0; display: flex; align-items: center; gap: .5rem; flex-wrap: wrap;
}
.api-key-box code { flex: 1; font-size: .7rem; word-break: break-all; }

/* Charts */
.chart-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1rem; flex-wrap: wrap; gap: .75rem;
}
.chart-container { position: relative; height: 380px; }
.chart-container.large { height: 460px; }
.chart-container.medium { height: 320px; }
.chart-container.small { height: 220px; }
.chart-footer { display: flex; justify-content: space-between; align-items: center; margin-top: .75rem; }
.help-text { font-size: .8rem; color: var(--gray-500); }

/* Time Range */
.time-range-selector { display: flex; gap: .35rem; background: var(--gray-100); padding: .2rem; border-radius: var(--radius-sm); }
.time-btn {
    padding: .4rem .85rem; border: none; background: transparent;
    border-radius: 4px; font-size: .8rem; cursor: pointer; color: var(--gray-500);
    transition: all .15s;
}
.time-btn:hover { color: var(--gray-700); background: rgba(0,0,0,.04); }
.time-btn.active { background: var(--white); color: var(--primary); box-shadow: var(--shadow-sm); font-weight: 600; }

/* Tables */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.data-table thead { background: var(--gray-50); }
.data-table th { text-align: left; padding: .6rem .75rem; font-weight: 600; color: var(--gray-500); border-bottom: 2px solid var(--gray-200); font-size: .75rem; text-transform: uppercase; letter-spacing: .03em; }
.data-table td { padding: .6rem .75rem; border-bottom: 1px solid var(--gray-100); }
.data-table tbody tr:hover { background: var(--gray-50); }
.muted { color: var(--gray-400); text-align: center; padding: 1.5rem; font-style: italic; }

/* Device selector */
.device-selector { display: flex; flex-wrap: wrap; gap: .6rem; }
.device-pill {
    display: flex; align-items: center; gap: .4rem;
    padding: .5rem .85rem; background: var(--gray-100); border-radius: 999px;
    cursor: pointer; font-size: .85rem; transition: all .15s;
    border: 2px solid transparent;
}
.device-pill:hover { background: var(--gray-200); }
.device-pill input:checked ~ span { font-weight: 600; color: var(--primary); }
.device-pill:has(input:checked) { border-color: var(--primary); background: rgba(59,130,246,.06); }
.device-pill input { accent-color: var(--primary); }

/* Spots stats */
.spots-stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
.spot-stat-card { background: var(--gray-50); border-radius: var(--radius-sm); padding: 1rem; border: 1px solid var(--gray-200); }
.spot-stat-head { display: flex; align-items: center; gap: .5rem; margin-bottom: .75rem; }
.spot-stat-head h4 { font-size: .95rem; margin: 0; }
.color-dot { width: 14px; height: 14px; border-radius: 50%; flex-shrink: 0; }
.spot-stat-body { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
.spot-stat-body > div { display: flex; flex-direction: column; }
.spot-stat-body .label { font-size: .7rem; color: var(--gray-500); text-transform: uppercase; }
.spot-stat-body .value { font-size: 1.05rem; font-weight: 600; color: var(--primary); }
.spot-stat-foot { margin-top: .75rem; padding-top: .5rem; border-top: 1px solid var(--gray-200); font-size: .75rem; color: var(--gray-500); }

/* Wind arrow inline */
.wind-arrow { display: inline-block; font-size: 1.2em; line-height: 1; }

/* Empty state */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--gray-500); grid-column: 1 / -1; }
.empty-state p { margin-bottom: 1rem; font-size: 1.05rem; }

/* Two-column layout */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}
.two-col > .card { margin-bottom: 0; }

/* Map */
.map-card { display: flex; flex-direction: column; }
#device-map { position: relative; z-index: 1; isolation: isolate; }
.map-coords {
    display: flex; align-items: center; gap: .5rem;
    margin-top: .75rem; font-size: .85rem;
}
.coord-label { color: var(--gray-500); font-size: .75rem; text-transform: uppercase; }
.coord-value { font-family: monospace; font-weight: 600; color: var(--gray-700); }

/* Stat grid vertical */
.stat-grid-vertical {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: .75rem;
}

/* Health chart spacing */
.health-chart-wrap {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-100);
}
.health-chart-wrap:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}
.health-chart-wrap h4 {
    font-size: .85rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: .03em;
    margin-bottom: .75rem;
}

/* Pagination */
.pagination { margin-top: 1rem; }
.pagination-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}
.page-info { font-size: .85rem; color: var(--gray-500); }
.pagination button:disabled {
    opacity: .4;
    cursor: not-allowed;
}

/* Tabs */
.tab-selector {
    display: flex; gap: .35rem;
    background: var(--gray-100); padding: .2rem; border-radius: var(--radius-sm);
}
.tab-btn {
    padding: .4rem .85rem; border: none; background: transparent;
    border-radius: 4px; font-size: .8rem; cursor: pointer; color: var(--gray-500);
    transition: all .15s;
}
.tab-btn:hover { color: var(--gray-700); background: rgba(0,0,0,.04); }
.tab-btn.active { background: var(--white); color: var(--primary); box-shadow: var(--shadow-sm); font-weight: 600; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Stat grid 2x2 for compact summary */
.stat-grid-2x2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .75rem;
}
.stat-cell {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: .75rem;
    text-align: center;
}
.stat-cell .stat-label { font-size: .7rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: .04em; margin-bottom: .25rem; }
.stat-cell .stat-value { font-size: 1.2rem; font-weight: 700; color: var(--primary); }

/* Wind speed legend */
.wind-legend {
    display: flex; align-items: center; gap: .5rem;
    margin-top: .75rem; padding-top: .75rem;
    border-top: 1px solid var(--gray-100);
    flex-wrap: wrap; font-size: .75rem;
}
.wind-legend-label { color: var(--gray-500); font-weight: 600; margin-right: .25rem; }
.wind-legend-item { display: flex; align-items: center; gap: .2rem; color: var(--gray-700); }
.wind-swatch {
    display: inline-block; width: 10px; height: 12px;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}
.wind-legend-unit { color: var(--gray-400); font-style: italic; margin-left: .15rem; }

/* Chart controls row */
.chart-controls {
    display: flex; gap: .75rem; align-items: center; flex-wrap: wrap;
}

/* Unit selector */
.unit-selector {
    display: flex; gap: .35rem;
    background: var(--gray-100); padding: .2rem; border-radius: var(--radius-sm);
}
.unit-btn {
    padding: .4rem .7rem; border: none; background: transparent;
    border-radius: 4px; font-size: .8rem; cursor: pointer; color: var(--gray-500);
    transition: all .15s; font-weight: 500;
}
.unit-btn:hover { color: var(--gray-700); background: rgba(0,0,0,.04); }
.unit-btn.active {
    background: var(--white); color: var(--primary);
    box-shadow: var(--shadow-sm); font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .two-col { grid-template-columns: 1fr; }
    .stat-grid-vertical { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
    .header-inner { flex-direction: column; gap: .5rem; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .devices-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .chart-header { flex-direction: column; align-items: flex-start; }
    .card-row { flex-direction: column; }
}