:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #121a2d;
  --panel-border: #27334d;
  --text: #eef3ff;
  --muted: #9aa8c2;
  --accent: #7c9cff;
  --accent-hover: #94adff;
  --input: #0d1425;
  --success: #a9e6c1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at top, rgba(77, 105, 185, .16), transparent 52%),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main {
  width: min(100%, 520px);
  padding: 32px;
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  background: rgba(18, 26, 45, .96);
  box-shadow: 0 24px 80px rgba(0, 0, 0, .28);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: .75rem;
  font-weight: 750;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 2.6rem);
  letter-spacing: -.045em;
}

.intro {
  margin: 10px 0 28px;
  color: var(--muted);
  line-height: 1.6;
}

form { display: grid; gap: 22px; }
.field { display: grid; gap: 9px; }

label {
  font-size: .92rem;
  font-weight: 650;
}

input {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid #34425f;
  border-radius: 10px;
  outline: none;
  background: var(--input);
  color: var(--text);
  font: inherit;
  transition: border-color .15s, box-shadow .15s;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 156, 255, .16);
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.45;
}

.timing-preview {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: rgba(9, 15, 29, .55);
}

.timing-label { color: var(--muted); font-size: .86rem; }
.timing-value { font-variant-numeric: tabular-nums; font-weight: 750; }

button {
  min-height: 50px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  border: 0;
  border-radius: 11px;
  background: var(--accent);
  color: #0a1125;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: background .15s, transform .15s;
}

button:hover { background: var(--accent-hover); }
button:active { transform: translateY(1px); }
button:focus-visible { outline: 3px solid #d7e0ff; outline-offset: 3px; }

.status {
  min-height: 22px;
  margin: -8px 0 0;
  color: var(--success);
  font-size: .88rem;
  line-height: 1.5;
}

.footer {
  margin: 22px 0 0;
  color: var(--muted);
  text-align: center;
  font-size: .78rem;
}

@media (max-width: 480px) {
  main { padding: 24px 20px; }
}