:root {
  --bg: #061018;
  --panel: #0b1a24;
  --card: #102331;
  --line: rgba(90, 180, 200, 0.16);
  --text: #eef8fa;
  --muted: #8aa3b0;
  --accent: #2ee6c7;
  --accent-dim: rgba(46, 230, 199, 0.12);
  --warn: #f3c16b;
  --ok: #3ee0a0;
  --off: #5d7380;
  --radius: 16px;

  /* Salinity band colours (Norfolk Broads context) */
  --band-fresh: #4ec3ff;
  --band-slight: #6fe0a8;
  --band-brackish: #f3c16b;
  --band-high: #ef8a5c;
  --band-saline: #d95b7a;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: ui-sans-serif, system-ui, "Segoe UI", sans-serif;
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(46, 230, 199, 0.14), transparent 50%),
    radial-gradient(800px 380px at 100% 0%, rgba(80, 160, 255, 0.1), transparent 46%),
    var(--bg);
  color: var(--text);
}

.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 36px 32px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}
.mark { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 0.04em; color: var(--accent); }
.mark-wave {
  width: 14px; height: 14px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, var(--accent) 60%, #0a5);
  box-shadow: 0 0 16px rgba(46, 230, 199, 0.55);
}
.login-card h1 { font-size: 1.7rem; margin: 18px 0 8px; letter-spacing: -0.03em; }
.lede { color: var(--muted); margin: 0 0 22px; line-height: 1.45; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 14px; }
input {
  width: 100%; margin-top: 6px; padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--line); background: #08151e; color: var(--text); font: inherit;
}
input:focus { outline: 2px solid rgba(46, 230, 199, 0.35); }
button {
  font: inherit; cursor: pointer; border: 0; border-radius: 12px;
  background: var(--accent); color: #04241d; font-weight: 700; padding: 12px 16px;
}
.login-card button { width: 100%; }
.error { color: #ff8b8b; font-size: 13px; }

#app { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }
aside {
  background: rgba(7, 18, 26, 0.86);
  border-right: 1px solid var(--line);
  padding: 22px 16px;
  display: flex; flex-direction: column; gap: 8px;
}
.brand { margin-bottom: 12px; }
.nav-label {
  margin: 8px 4px 4px; font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--muted);
}
.org { color: var(--muted); font-size: 12px; margin-top: 6px; }
#site-nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }
#site-nav button {
  background: transparent; color: var(--text); text-align: left;
  padding: 12px; border: 1px solid transparent;
}
#site-nav button.on, #site-nav button:hover {
  background: var(--accent-dim); border-color: var(--line);
}
.nav-name { display: block; font-weight: 650; }
.nav-meta { display: block; color: var(--muted); font-size: 12px; font-weight: 400; margin-top: 2px; }
.aside-foot { font-size: 12px; color: var(--muted); display: grid; gap: 8px; }
#logout { background: transparent; color: var(--muted); border: 1px solid var(--line); }

main { padding: 28px 32px 56px; max-width: 1280px; }
.top { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; flex-wrap: wrap; }
.site-head { min-width: 0; flex: 1; }
.kicker { margin: 0; color: var(--accent); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; }
h2 { margin: 6px 0 4px; font-size: 2rem; letter-spacing: -0.03em; }
.sub { margin: 0; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.loc-pin { color: var(--accent); }
.site-notes { margin: 6px 0 0; color: var(--muted); font-size: 13px; line-height: 1.4; max-width: 620px; }
[data-field] { outline: none; border-radius: 6px; padding: 1px 4px; margin: 0 -4px; }
[data-field][contenteditable="true"] { background: rgba(46,230,199,0.06); border: 1px dashed rgba(46,230,199,0.4); cursor: text; }
[data-field][contenteditable="true"]:focus { background: rgba(46,230,199,0.12); border-style: solid; }
[data-field][contenteditable="true"]:empty::before { content: attr(data-placeholder); color: var(--muted); }

.head-actions { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.ghost {
  background: transparent; color: var(--text); border: 1px solid var(--line);
  padding: 9px 14px; border-radius: 12px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px;
}
.ghost:hover { border-color: var(--accent); color: var(--accent); }
.ghost:disabled { opacity: 0.5; cursor: not-allowed; }

.ranges {
  display: flex; flex-wrap: wrap; gap: 4px; background: var(--card); padding: 4px;
  border-radius: 12px; border: 1px solid var(--line); justify-content: flex-end;
}
.ranges button { background: transparent; color: var(--muted); padding: 8px 12px; }
.ranges button.on { background: var(--accent); color: #04241d; }

/* Hero salinity card */
.hero-card {
  margin: 22px 0 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 24px;
}
.hero-main { min-width: 0; }
.hero-value { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin: 4px 0 2px; }
.hero-value strong { font-size: 3.4rem; letter-spacing: -0.04em; font-variant-numeric: tabular-nums; line-height: 1; }
.hero-unit { color: var(--muted); font-size: 1rem; }
.hero-band {
  display: inline-block; padding: 5px 12px; border-radius: 999px; font-size: 12px;
  font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  background: rgba(255,255,255,0.06); color: var(--muted); border: 1px solid var(--line);
}
.hero-band.fresh { background: rgba(78,195,255,0.14); color: var(--band-fresh); border-color: rgba(78,195,255,0.35); }
.hero-band.slight { background: rgba(111,224,168,0.14); color: var(--band-slight); border-color: rgba(111,224,168,0.35); }
.hero-band.brackish { background: rgba(243,193,107,0.15); color: var(--band-brackish); border-color: rgba(243,193,107,0.35); }
.hero-band.high { background: rgba(239,138,92,0.16); color: var(--band-high); border-color: rgba(239,138,92,0.4); }
.hero-band.saline { background: rgba(217,91,122,0.16); color: var(--band-saline); border-color: rgba(217,91,122,0.4); }
.hero-sub { color: var(--muted); margin: 8px 0 14px; font-size: 14px; }
.hero-bar {
  position: relative; height: 12px; border-radius: 999px; margin-top: 8px;
  background: linear-gradient(90deg,
    var(--band-fresh) 0%, var(--band-fresh) 20%,
    var(--band-slight) 20%, var(--band-slight) 40%,
    var(--band-brackish) 40%, var(--band-brackish) 60%,
    var(--band-high) 60%, var(--band-high) 80%,
    var(--band-saline) 80%, var(--band-saline) 100%);
  overflow: hidden;
}
.hero-bar .marker {
  position: absolute; top: -3px; width: 3px; height: 18px; border-radius: 2px;
  background: #fff; box-shadow: 0 0 12px rgba(255,255,255,0.6);
  transition: left 0.4s ease;
}
.hero-legend {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px;
  font-size: 11px; color: var(--muted); margin-top: 8px;
}
.hero-legend div { display: flex; flex-direction: column; gap: 2px; align-items: flex-start; }
.hero-legend b { color: var(--text); font-weight: 600; font-size: 12px; }
.hero-side { display: flex; flex-direction: column; gap: 10px; border-left: 1px solid var(--line); padding-left: 20px; }
.mini { display: grid; }
.mini span { color: var(--muted); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; }
.mini strong { font-size: 1.4rem; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; margin: 4px 0 0; }
.mini em { font-style: normal; color: var(--muted); font-size: 12px; }

.card-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.card-head h3 { margin: 0; }
.info {
  position: relative; width: 18px; height: 18px; padding: 0; border-radius: 50%;
  background: transparent; color: var(--muted); border: 1px solid var(--line);
  font-size: 11px; font-weight: 700; line-height: 16px; flex-shrink: 0;
}
.info:hover, .info:focus { color: var(--accent); border-color: var(--accent); }
.info em {
  display: none; position: absolute; left: 0; top: calc(100% + 8px); z-index: 20;
  width: 260px; padding: 10px 12px; border-radius: 10px; font-style: normal; font-weight: 400;
  font-size: 12px; line-height: 1.45; color: var(--text); background: #0a1c28;
  border: 1px solid var(--line); box-shadow: 0 12px 32px rgba(0,0,0,0.45); text-transform: none; letter-spacing: 0;
}
.info:hover em, .info:focus em, .info.open em { display: block; }

.chart-tools {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  margin: 4px 0 12px; color: var(--muted); font-size: 12px;
}
.chart-tools button[data-ma] {
  background: var(--card); color: var(--muted); border: 1px solid var(--line);
  padding: 6px 10px; border-radius: 999px;
}
.chart-tools button[data-ma].on { background: var(--accent-dim); color: var(--accent); border-color: rgba(46,230,199,0.35); }
.chart-card, .card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 12px;
  margin-bottom: 12px;
}
.chart-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; margin-bottom: 8px; }
.chart-head h3, .card h3 { margin: 0; font-size: 15px; display: flex; align-items: center; gap: 8px; }
.hint, #chart-meta, #ec-meta, #temp-meta { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
canvas { width: 100%; display: block; cursor: crosshair; }
.chart-tip {
  position: fixed;
  z-index: 40;
  pointer-events: none;
  background: rgba(6, 16, 24, 0.94);
  border: 1px solid rgba(138, 163, 176, 0.4);
  color: #e8f4f7;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.4;
  border-radius: 6px;
  max-width: 260px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.chart-tip[hidden] { display: none !important; }
.chart-tip strong { display: block; margin-bottom: 4px; color: #2ee6c7; }
.chart-tip .band-tag { display: inline-block; padding: 1px 6px; border-radius: 4px; font-size: 10px; margin-left: 6px; }

.split { display: grid; grid-template-columns: 0.9fr 1.3fr; gap: 12px; margin-top: 12px; }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 8px; }
.dot.live { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.dot.recent { background: var(--warn); }
.dot.offline { background: var(--off); }
.probe-row {
  display: flex; justify-content: space-between; gap: 12px; align-items: center;
  padding: 12px 0; border-bottom: 1px solid var(--line);
}
.probe-row:last-child { border-bottom: 0; }
.probe-row .name-wrap { min-width: 0; flex: 1; }
.probe-row strong { display: inline; }
.badge {
  font-size: 11px; padding: 3px 8px; border-radius: 999px; border: 1px solid var(--line);
  color: var(--muted); text-transform: capitalize;
}
.badge.live { color: var(--ok); border-color: rgba(62, 224, 160, 0.35); }
.badge.recent { color: var(--warn); border-color: rgba(243,193,107,0.35); }
.table-wrap { overflow: auto; max-height: 320px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
th { text-align: left; color: var(--muted); font-weight: 600; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; }
td, th { padding: 9px 6px; border-bottom: 1px solid var(--line); }
.empty { color: var(--muted); padding: 16px 0; }

@media (max-width: 1080px) {
  .hero-card { grid-template-columns: 1fr; }
  .hero-side { border-left: 0; border-top: 1px solid var(--line); padding-left: 0; padding-top: 14px; flex-direction: row; }
  .mini { flex: 1; }
}
@media (max-width: 980px) {
  #app { grid-template-columns: 1fr; }
  aside { flex-direction: row; flex-wrap: wrap; }
  #site-nav { flex-direction: row; overflow: auto; }
  .split { grid-template-columns: 1fr; }
  .head-actions { align-items: flex-start; }
}
@media (max-width: 640px) {
  main { padding: 18px; }
  .hero-legend { grid-template-columns: repeat(2, 1fr); }
  .hero-side { flex-direction: column; }
}