:root {
  --font-display: "Syne", sans-serif;
  --font-body: "Outfit", sans-serif;
  --font-mono: "Fragment Mono", "IBM Plex Mono", monospace;
  --weight-light: 300;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --bg: #080a0d;
  --bg-elevated: #0d1116;
  --surface: #12171e;
  --surface-2: #171d25;
  --border: rgba(232, 238, 242, 0.07);
  --border-strong: rgba(0, 202, 238, 0.4);
  --tritium: #00caee;
  --tritium-dim: #0789a0;
  --tritium-soft: rgba(0, 202, 238, 0.08);
  --text: #e8eef2;
  --muted: #7d8b96;
  --danger: #ff6b55;
  --ok: #3dd68c;
  --warn: #e6b84d;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 120ms;
  --dur: 280ms;
  --radius: 6px;
  --rail: 168px;
  --pad: 1rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: 14px;
  line-height: 1.45;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  letter-spacing: -0.03em;
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

.range-shell {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  background:
    radial-gradient(700px 360px at 0% 0%, rgba(0, 202, 238, 0.05), transparent 60%),
    var(--bg);
}

.range-content {
  position: relative;
  z-index: 1;
}

.btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: 0.82rem;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--border-strong);
  outline: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--tritium);
  border-color: var(--tritium);
  color: #041018;
  font-weight: var(--weight-bold);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  filter: brightness(1.05);
}

.btn-danger {
  border-color: rgba(255, 107, 85, 0.4);
  color: var(--danger);
  background: transparent;
}

.btn-ghost {
  background: transparent;
}

.btn-sm {
  padding: 0.28rem 0.55rem;
  font-size: 0.75rem;
}

.eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tritium-dim);
}

.lede {
  margin: 0;
  color: var(--muted);
  font-weight: var(--weight-light);
  line-height: 1.5;
  font-size: 0.9rem;
}

.mono {
  font-family: var(--font-mono);
}

.muted {
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}