:root {
  --bg: #0b1120;
  --card: #131c2e;
  --card-2: #1a2740;
  --text: #e6edf7;
  --muted: #8ba0bd;
  --line: #24314b;
  --green: #22c55e;
  --amber: #f59e0b;
  --red: #ef4444;
  --accent: #38bdf8;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px 24px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: max(12px, env(safe-area-inset-top)) 16px 12px;
  background: linear-gradient(var(--bg), rgba(11,17,32,0.85));
  backdrop-filter: blur(6px);
}
.topbar h1 { font-size: 20px; margin: 0; letter-spacing: 0.5px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  margin: 12px 0;
}
.card h2 { margin: 0 0 8px; font-size: 15px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.6px; }

/* Hero */
.hero { text-align: center; padding: 24px 16px; transition: background .3s, border-color .3s; }
.hero-label { font-size: 14px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.hero-value { font-size: 56px; font-weight: 800; line-height: 1.05; margin: 6px 0; font-variant-numeric: tabular-nums; }
.hero-sub { font-size: 15px; color: var(--muted); }

.level-green  { border-color: var(--green); background: radial-gradient(120% 120% at 50% 0, rgba(34,197,94,.18), transparent 60%), var(--card); }
.level-amber  { border-color: var(--amber); background: radial-gradient(120% 120% at 50% 0, rgba(245,158,11,.20), transparent 60%), var(--card); }
.level-red    { border-color: var(--red);   background: radial-gradient(120% 120% at 50% 0, rgba(239,68,68,.22),  transparent 60%), var(--card); }
.level-green  .hero-value { color: var(--green); }
.level-amber  .hero-value { color: var(--amber); }
.level-red    .hero-value { color: var(--red); }

/* Stat grid */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; }
.stat { padding: 14px; margin: 0; }
.stat-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .6px; }
.stat-value { font-size: 26px; font-weight: 700; margin-top: 4px; font-variant-numeric: tabular-nums; }
.stat-note { font-size: 12px; color: var(--muted); margin-top: 2px; min-height: 14px; }

/* Forms */
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 0; }
input {
  width: 100%;
  margin-top: 6px;
  padding: 14px;
  font-size: 20px;
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.gps-hint { display: block; font-size: 12px; color: var(--accent); margin-top: 4px; min-height: 14px; }
.hint { font-size: 13px; color: var(--muted); margin: 8px 0 0; }

button {
  font-size: 16px;
  font-weight: 600;
  border-radius: 12px;
  border: 1px solid var(--line);
  padding: 12px 16px;
  cursor: pointer;
}
.primary { width: 100%; margin-top: 16px; background: var(--accent); color: #06263a; border: none; padding: 16px; font-size: 18px; }
.ghost { background: transparent; color: var(--muted); }
.ghost.danger { color: var(--red); border-color: var(--red); }
#gpsToggle[aria-pressed="true"] { color: var(--green); border-color: var(--green); }

.row-between { display: flex; align-items: center; justify-content: space-between; }

/* Checkpoint list */
.cplist { list-style: none; margin: 8px 0 0; padding: 0; }
.cplist li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  align-items: baseline;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.cplist li:first-child { border-top: none; }
.cp-primary { font-size: 16px; }
.cp-sub { font-size: 12px; color: var(--muted); }
.cp-ratio { font-weight: 700; }
.cp-ratio.green { color: var(--green); }
.cp-ratio.amber { color: var(--amber); }
.cp-ratio.red { color: var(--red); }

.install-btn {
  display: block;
  text-align: center;
  background: var(--accent);
  color: #06263a;
  font-weight: 700;
  font-size: 18px;
  padding: 16px;
  border-radius: 12px;
  text-decoration: none;
}

.foot { text-align: center; color: var(--muted); font-size: 12px; padding: 8px 16px 24px; }

/* Light mode for anyone who prefers it */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f2f5fb; --card: #ffffff; --card-2: #eef2f9; --text: #10192b;
    --muted: #5b6b86; --line: #dbe3ef;
  }
  .primary { color: #fff; }
}