:root {
  color-scheme: dark;
  --bg: #0b0f14;
  --panel: #111820;
  --panel-2: #16212c;
  --text: #e8f0f7;
  --muted: #8fa3b8;
  --accent: #5eead4;
  --accent-2: #38bdf8;
  --danger: #fb7185;
  --border: #263544;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(56, 189, 248, 0.16), transparent 32rem),
    radial-gradient(circle at 90% 10%, rgba(94, 234, 212, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font: 16px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

.shell {
  width: min(880px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4rem 0;
}

.hero { margin-bottom: 2rem; }
.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
h1 {
  margin: 0;
  font-size: clamp(2.2rem, 7vw, 4.4rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}
.lede { max-width: 42rem; color: var(--muted); }

.panel {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent), var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.field { display: grid; gap: 0.45rem; margin-bottom: 1rem; }
label { color: var(--muted); font-size: 0.9rem; font-weight: 600; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

input, select, textarea, button {
  font: inherit;
  color: var(--text);
}
input[type="password"], select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--panel-2);
  padding: 0.8rem 0.9rem;
  outline: none;
}
textarea { resize: vertical; min-height: 9rem; }
input:focus, select:focus, textarea:focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
output { color: var(--accent); font-variant-numeric: tabular-nums; }

.actions { display: flex; flex-wrap: wrap; gap: 0.7rem; }
button {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--panel-2);
  padding: 0.7rem 1.1rem;
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}
button:hover:not(:disabled) { border-color: var(--accent-2); transform: translateY(-1px); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #041016; border: 0; font-weight: 800; }

.status {
  min-height: 1.5rem;
  margin: 1rem 0 0;
  color: var(--muted);
}
.status.error { color: var(--danger); }

footer { margin-top: 1.2rem; color: var(--muted); font-size: 0.82rem; }
code { color: var(--accent); }

@media (max-width: 640px) {
  .shell { padding: 2rem 0; }
  .grid { grid-template-columns: 1fr; }
}