:root {
  --bg: #061620;
  --bg-2: #0b2332;
  --panel: #0f2d40;
  --panel-2: #14384f;
  --border: #1d4861;
  --text: #e6f1f7;
  --muted: #7fa2b8;
  --accent: #29b6f6;
  --accent-2: #4fc3f7;
  --ok: #38d39f;
  --warn: #f5a623;
  --flood: #ef5a6f;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
  --radius: 10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 20% -10%, #13394f 0%, var(--bg) 55%) fixed;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { color: var(--text); margin: 0 0 .5rem; font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }

.muted { color: var(--muted); }
.mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .85em; }

/* Layout */
.topbar {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: .9rem 1.75rem;
  background: rgba(6, 18, 28, .85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.topbar__brand a {
  display: flex; align-items: center; gap: .5rem;
  color: var(--text); font-weight: 600; font-size: 1.05rem;
  text-decoration: none;
}
.brand-mark { color: var(--accent); font-size: 1.4em; line-height: 1; }
.topbar__nav { display: flex; gap: 1.25rem; flex: 1; }
.topbar__nav a { color: var(--muted); font-weight: 500; }
.topbar__nav a:hover { color: var(--text); text-decoration: none; }
.topbar__user { display: flex; align-items: center; gap: .75rem; }

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.75rem;
}
.page__header {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: 1.5rem; gap: 1rem; flex-wrap: wrap;
}
.page__header-actions { display: flex; gap: .5rem; }

/* Flash messages */
.flashes { margin-bottom: 1.25rem; display: flex; flex-direction: column; gap: .5rem; }
.flash { padding: .65rem .9rem; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--panel); }
.flash--error { border-color: #6b2a36; background: #2b141a; color: #ffc4ce; }
.flash--success { border-color: #1f5a49; background: #0e2e25; color: #9fe9ca; }
.flash--info { border-color: #214e6b; background: #0f2a3a; }

/* Auth pages */
.body--auth { display: grid; place-items: center; min-height: 100vh; }
.body--auth .page { width: 100%; max-width: 420px; }
.auth-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}
.auth-card__brand { text-align: center; margin-bottom: 1.5rem; }
.auth-card__brand .brand-mark { display: block; font-size: 3rem; color: var(--accent); margin-bottom: .25rem; }
.auth-card__brand h1 { font-size: 1.4rem; margin: 0; }
.auth-card__footer { text-align: center; margin: 1.25rem 0 0; font-size: .9rem; color: var(--muted); }

/* Forms */
.stack > * + * { margin-top: .9rem; }
label { display: block; color: var(--muted); font-size: .85rem; font-weight: 500; }
label input[type="text"],
label input[type="email"],
label input[type="password"],
label input[type="number"],
label select,
label textarea,
input[type="text"], input[type="email"], input[type="password"], input[type="number"] {
  display: block; width: 100%; margin-top: .3rem;
  background: var(--bg-2); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .6rem .75rem; font-size: .95rem;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(41, 182, 246, .18); }
input:disabled { opacity: .6; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .4rem; padding: .6rem 1.1rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font-size: .9rem; font-weight: 600; cursor: pointer; text-decoration: none;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:hover { background: var(--border); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #00131c; }
.btn--primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn--ghost { background: transparent; }
.btn--sm { padding: .35rem .7rem; font-size: .8rem; }
.btn--block { width: 100%; }

/* Device grid */
.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.device-card {
  display: block;
  padding: 1.1rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  color: var(--text);
  transition: transform .12s, box-shadow .12s, background .12s;
}
.device-card:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); background: var(--panel-2); }
.device-card--ok    { border-left-color: var(--ok); }
.device-card--warn  { border-left-color: var(--warn); }
.device-card--flood { border-left-color: var(--flood); }
.device-card__header { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.device-card__header h3 { margin: 0; }
.device-card__level { margin: .75rem 0 .5rem; }
.device-card__level-num { font-size: 2.5rem; font-weight: 700; letter-spacing: -.03em; }
.device-card__level-unit { font-size: 1rem; color: var(--muted); margin-left: .25rem; }
.device-card__meta { display: flex; justify-content: space-between; font-size: .78rem; color: var(--muted); gap: .5rem; flex-wrap: wrap; }

.pill {
  display: inline-block;
  padding: .15rem .55rem;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .05em;
  background: var(--panel-2);
}
.pill--ok    { background: rgba(56,211,159,.18); color: var(--ok); }
.pill--warn  { background: rgba(245,166,35,.18); color: var(--warn); }
.pill--flood { background: rgba(239,90,111,.18); color: var(--flood); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}
.empty-state h2 { margin-bottom: .25rem; }
.empty-state p { margin: 0 0 1.25rem; }

/* Hero stat */
.hero-stat {
  display: flex; align-items: center; justify-content: space-between;
  gap: 2rem; padding: 1.5rem 1.75rem; margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius);
  flex-wrap: wrap;
}
.hero-stat--ok    { border-left-color: var(--ok); }
.hero-stat--warn  { border-left-color: var(--warn); }
.hero-stat--flood { border-left-color: var(--flood); }
.hero-stat__label { margin: 0; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; }
.hero-stat__value { font-size: 3.5rem; font-weight: 800; letter-spacing: -.04em; margin: .25rem 0; line-height: 1; }
.hero-stat__unit { font-size: 1.25rem; color: var(--muted); margin-left: .25rem; }
.hero-stat__side { display: grid; grid-template-columns: repeat(2, minmax(120px, auto)); gap: .75rem 1.5rem; }
.hero-stat__side > div { display: flex; flex-direction: column; gap: .15rem; }
.hero-stat__side span { font-size: .75rem; }

/* Panels */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.panel__header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.panel__header h2 { margin: 0; }

.range-toggle { display: inline-flex; background: var(--bg-2); padding: 3px; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.range-toggle__btn {
  padding: .35rem .75rem; font-size: .8rem; border-radius: 4px;
  color: var(--muted); font-weight: 600;
}
.range-toggle__btn:hover { color: var(--text); text-decoration: none; }
.range-toggle__btn.is-active { background: var(--accent); color: #00131c; }

/* Chart */
.chart-wrap { height: 320px; position: relative; }

/* Stats row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.stats-row > div { display: flex; flex-direction: column; gap: .2rem; }
.stats-row span { font-size: .75rem; }
.stats-row strong { font-size: 1.1rem; }

/* Table */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.data-table th, .data-table td { padding: .55rem .75rem; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th { color: var(--muted); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; }
.data-table tbody tr:hover { background: var(--panel-2); }

/* Config grid */
.config-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin: 0 0 1rem; }
.config-grid > div { display: flex; flex-direction: column; gap: .2rem; }
.config-grid dt { color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; }
.config-grid dd { margin: 0; font-weight: 600; }

/* Forms grid */
.form-grid { display: flex; flex-direction: column; gap: 1rem; }
.form-grid fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem 1.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.form-grid legend { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; padding: 0 .4rem; }
.form-actions { display: flex; justify-content: flex-end; gap: .5rem; }

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: .75rem; padding: .75rem 1rem; }
  .topbar__nav { order: 3; width: 100%; }
  .page { padding: 1rem; }
  .hero-stat__value { font-size: 2.5rem; }
}