:root {
    --bg: #f3f5f7;
    --panel: #ffffff;
    --text: #1d232a;
    --muted: #6b7280;
    --line: #d9dee5;
    --primary: #1f6feb;
    --danger: #c62828;
    --shadow: 0 8px 24px rgba(0,0,0,0.08);
    --radius: 16px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px;
}

.topbar {
    background: var(--panel);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 14px 16px;
    margin-bottom: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    align-items: center;
    justify-content: space-between;
}

.brand {
    font-size: 20px;
    font-weight: 700;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.nav a,
.btn,
button {
    display: inline-block;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
}

.btn-primary,
button.btn-primary {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}

.hero, .panel, .card {
    background: var(--panel);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
    margin-bottom: 16px;
}

.narrow { max-width: 520px; margin: 0 auto; }
.wide { max-width: 760px; margin: 0 auto; }

.grid {
    display: grid;
    gap: 16px;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }

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

label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
}

input, select {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--line);
    border-radius: 10px;
    margin-bottom: 14px;
    font-size: 14px;
    background: #fff;
}

.flash {
    padding: 12px 14px;
    border-radius: 12px;
    margin-bottom: 16px;
}

.error { background: #fdecec; color: #8b1e1e; }
.success { background: #eaf8ee; color: #1f5f2a; }

.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 10px 8px;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
    font-size: 14px;
}

.kv {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 8px;
    font-size: 14px;
}

.inline {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 5px 8px;
    border-radius: 999px;
    background: #eef2f7;
    font-size: 12px;
}

code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 6px;
}

@media (max-width: 900px) {
    .grid-2,
    .cards {
        grid-template-columns: 1fr;
    }

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

    .topbar {
        align-items: flex-start;
    }
}

.sensor-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 12px;
}

.sensor-meta .badge {
    display: block;
    width: 100%;
    text-align: center;
}

@media (max-width: 900px) {
    .sensor-meta {
        grid-template-columns: 1fr;
    }
}