:root {
  --bg: #070b16;
  --bg-elevated: #0e1422;
  --bg-glow: #122038;
  --surface: #141b2a;
  --glass: rgba(18, 26, 42, 0.72);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #f5f7fa;
  --text-secondary: #9aa3b2;
  --text-tertiary: #5c6472;
  --brand: #5b8cff;
  --cyan: #4ec4ff;
  --success: #33d17a;
  --warning: #f2b33d;
  --danger: #ff5a5f;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

.glow {
  position: fixed;
  inset: 12% 10% auto;
  height: 280px;
  background: radial-gradient(ellipse at center, rgba(78, 196, 255, 0.12), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

#app { position: relative; z-index: 1; min-height: 100vh; }

a { color: var(--cyan); text-decoration: none; }
button, input, select, textarea { font: inherit; }

.wrap {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 16px 0 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.03em;
}
.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--cyan), var(--brand));
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}
.nav a, .nav button.linkish {
  color: var(--text-secondary);
  background: transparent;
  border: 0;
  padding: 8px 10px;
  border-radius: 999px;
  cursor: pointer;
}
.nav a.active, .nav a:hover, .nav button.linkish:hover {
  color: var(--text);
  background: var(--glass);
}

.hero h1, .page-title {
  font-size: clamp(28px, 6vw, 40px);
  letter-spacing: -0.04em;
  margin: 8px 0 8px;
}
.lede, .muted { color: var(--text-secondary); }
.accent { color: var(--cyan); }

.card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.stack { display: flex; flex-direction: column; gap: 14px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
input, select {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
input:focus, select:focus {
  outline: 2px solid rgba(78, 196, 255, 0.35);
  border-color: var(--cyan);
}
.code-input {
  font-size: 28px;
  letter-spacing: 0.28em;
  text-align: center;
  text-transform: uppercase;
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 650;
  cursor: pointer;
  color: #071018;
  background: linear-gradient(135deg, var(--cyan), var(--brand));
}
.btn:disabled { opacity: 0.5; cursor: default; }
.btn.secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(255, 90, 95, 0.4);
}
.btn.ghost {
  background: transparent;
  color: var(--cyan);
}

.alert {
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
}
.alert.error {
  background: rgba(255, 90, 95, 0.1);
  border: 1px solid rgba(255, 90, 95, 0.35);
  color: #ffd4d6;
}
.alert.ok {
  background: rgba(51, 209, 122, 0.1);
  border: 1px solid rgba(51, 209, 122, 0.3);
  color: #b6f0cc;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 720px) {
  .grid.two { grid-template-columns: 1fr 1fr; }
}

.list-card {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}
.kicker {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 4px;
}
.meta { color: var(--text-secondary); font-size: 13px; margin: 4px 0 0; }

.device-preview {
  text-align: center;
  padding: 28px 16px;
}
.device-preview h2 { margin: 8px 0 4px; font-size: 24px; }
.confirm-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
}
.tabs button {
  flex: 1;
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
}
.tabs button.active {
  color: var(--text);
  border-color: var(--cyan);
}

.empty {
  text-align: center;
  color: var(--text-secondary);
  padding: 12px 0;
}

.footer-note {
  margin-top: 28px;
  color: var(--text-tertiary);
  font-size: 12px;
  text-align: center;
}