:root {
  --bg: #0f172a;
  --card: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f8fafc;
  --muted: rgba(248, 250, 252, 0.72);
  --teal: #20d6d1;
  --teal-dark: #0ca5a0;
  --danger: #f87171;
  --ok: #34d399;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 10%, rgba(32, 214, 209, 0.16), transparent 42%),
    radial-gradient(circle at 90% 80%, rgba(99, 102, 241, 0.16), transparent 40%),
    var(--bg);
}

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 20px 16px 48px;
}

.brand {
  margin: 0;
  color: var(--teal);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 12px;
}

h1 {
  margin: 6px 0 8px;
  font-size: 32px;
  line-height: 1.1;
}

.lede, .hint, .step p, .rule p {
  color: var(--muted);
  line-height: 1.45;
}

nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 18px 0;
}

nav button, .btn, .btn-secondary, .btn-danger {
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

nav button {
  background: transparent;
  color: var(--muted);
}

nav button.active {
  background: var(--teal);
  color: #042f2e;
  border-color: transparent;
}

.card, .rule, form, .steps {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 14px;
}

.steps { list-style: none; padding-left: 16px; margin: 0 0 14px; }
.steps li { margin: 0 0 14px; }
.steps strong { display: block; margin-bottom: 4px; }

label {
  display: block;
  margin: 12px 0 6px;
  font-size: 14px;
  font-weight: 600;
}

input, select {
  width: 100%;
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.65);
  color: var(--text);
  padding: 0 12px;
  font: inherit;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}

.check input { width: auto; min-height: 0; }

.btn, .btn-secondary, .btn-danger {
  width: 100%;
  margin-top: 12px;
}

.btn { background: var(--teal); color: #042f2e; border-color: transparent; }
.btn-secondary { background: transparent; color: var(--text); }
.btn-danger { background: transparent; color: var(--danger); border-color: rgba(248, 113, 113, 0.4); }

.btn-install {
  min-height: 52px;
  font-size: 17px;
  box-shadow: 0 8px 24px rgba(32, 214, 209, 0.28);
}

.install-banner {
  border-color: rgba(251, 191, 36, 0.75);
  background: rgba(251, 191, 36, 0.12);
}

.install-banner h2 { color: #fde68a; }
.install-banner p { color: #fef3c7; margin: 0; }

.install-result {
  margin: 12px 0 0;
  color: var(--text);
  font-weight: 700;
  line-height: 1.45;
}

.install-result:empty { display: none; }

.steps.highlight,
.card.highlight {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(32, 214, 209, 0.35);
}

.steps li.pulse {
  background: rgba(32, 214, 209, 0.14);
  border-radius: 10px;
  padding: 8px 8px 2px;
  margin-left: -8px;
  margin-right: -8px;
}

.steps li.pulse strong { color: var(--teal); }

.steps:focus { outline: none; }

.rule header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

.rule h2, form h2, .card h2 { margin: 0 0 8px; font-size: 18px; }
.pill {
  font-size: 12px;
  font-weight: 700;
  color: var(--teal);
}
.pill.off { color: var(--muted); }

.actions { display: flex; gap: 8px; }
.actions button { flex: 1; margin-top: 8px; }

#toast {
  min-height: 1.2em;
  color: var(--ok);
  font-weight: 600;
}

#toast.error { color: var(--danger); }

a { color: var(--teal); }

.board-link { font-size: 14px; }