:root {
  --bg: #0f172a;
  --panel: #111c33;
  --panel-2: #17233f;
  --line: #24324f;
  --text: #e8eef9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-ink: #04202e;
  --ok: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
  --radius: 14px;
  --tap: 44px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow-x: hidden;
  padding-bottom: env(safe-area-inset-bottom);
}

a { color: var(--accent); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.2rem; }
p { margin: .25rem 0 .75rem; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
[hidden] { display: none !important; }

.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: calc(.5rem + env(safe-area-inset-top)) 16px .5rem;
  background: rgba(15, 23, 42, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; min-height: var(--tap); display: inline-flex; align-items: center; }
.topnav { display: flex; gap: .25rem; }
.topnav a {
  min-height: var(--tap); min-width: var(--tap); padding: 0 .75rem;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; color: var(--muted); text-decoration: none;
}
.topnav a.active { color: var(--text); background: var(--panel-2); }

main { max-width: 640px; margin: 0 auto; padding: 16px; outline: none; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin: 0 0 16px; min-width: 0; overflow-wrap: anywhere;
}
.row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.stack > * + * { margin-top: .75rem; }

label { display: block; font-weight: 600; margin: .75rem 0 .25rem; }
.help { color: var(--muted); font-size: .875rem; margin: .25rem 0 0; }
input[type=text], input[type=url], input[type=email], input[type=password], input[type=number],
textarea, select {
  width: 100%; max-width: 100%;
  min-height: var(--tap);
  padding: .6rem .75rem;
  border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text);
  font: inherit; font-size: 16px; /* 16px stops iOS zooming into fields */
}
textarea { min-height: 7rem; resize: vertical; }
select[multiple] { min-height: 9rem; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.check { display: flex; align-items: center; gap: .6rem; min-height: var(--tap); font-weight: 500; margin: .5rem 0; }
.check input { width: 22px; height: 22px; margin: 0; flex: none; }

button, .btn {
  min-height: var(--tap); min-width: var(--tap);
  padding: .6rem 1rem;
  border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel-2); color: var(--text);
  font: inherit; font-weight: 600;
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  text-decoration: none; cursor: pointer;
  max-width: 100%; white-space: normal; text-align: center;
}
button.primary, .btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.ghost { background: transparent; }
button.danger { border-color: var(--bad); color: var(--bad); background: transparent; }
button:disabled { opacity: .55; cursor: default; }
.wide { width: 100%; }

.choice-grid { display: grid; grid-template-columns: 1fr; gap: .5rem; }
.choice {
  text-align: left; justify-content: flex-start; flex-direction: column; align-items: flex-start;
  padding: .85rem 1rem; width: 100%;
}
.choice.selected { border-color: var(--accent); background: #0c2a3d; }
.choice small { font-weight: 400; color: var(--muted); }

.note { border-left: 4px solid var(--accent); padding: .6rem .8rem; background: var(--panel-2); border-radius: 8px; margin: .75rem 0; }
.note.warn { border-color: var(--warn); }
.note.bad { border-color: var(--bad); }
.note.ok { border-color: var(--ok); }

.badge { display: inline-flex; align-items: center; min-height: 28px; padding: 0 .6rem; border-radius: 999px; font-size: .8rem; font-weight: 600; background: var(--panel-2); border: 1px solid var(--line); }
.badge.on { color: var(--ok); border-color: #1f5135; }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .75rem; }
.tile {
  display: flex; flex-direction: column; align-items: flex-start; gap: .25rem;
  min-height: 96px; padding: 14px; border-radius: var(--radius);
  background: var(--panel-2); border: 1px solid var(--line);
  color: var(--text); text-decoration: none; text-align: left;
}
.tile strong { font-size: 1rem; }
.tile span { color: var(--muted); font-size: .85rem; }
.tile.broken { border-color: var(--bad); }

.list { list-style: none; margin: 0; padding: 0; }
.list li { display: flex; gap: .5rem; align-items: center; justify-content: space-between; padding: .6rem 0; border-top: 1px solid var(--line); }
.list li:first-child { border-top: 0; }
.list li > div { min-width: 0; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem; text-align: center; }
.stats b { display: block; font-size: 1.4rem; }

.steps { display: flex; gap: .4rem; margin-bottom: .75rem; }
.steps i { flex: 1; height: 4px; border-radius: 2px; background: var(--line); }
.steps i.on { background: var(--accent); }

.result { overflow-wrap: anywhere; }
.result h2 { margin-top: 1.25rem; font-size: 1.1rem; }
.result pre { overflow-x: auto; max-width: 100%; }
.result table { display: block; overflow-x: auto; max-width: 100%; }
.result img { max-width: 100%; }

.errors { color: var(--bad); padding-left: 1.2rem; }
.mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .875rem; }

.mt { margin-top: 1rem; }
.between { justify-content: space-between; }