@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700&family=Space+Grotesk:wght@500;700&display=swap");

:root {
  --background: #f8fafc;
  --foreground: #0f172a;
  --primary: #2e757a;
  --muted-foreground: #475569;
  --card: #ffffff;
  --card-subtle: #f1f5f9;
  --border: #e2e8f0;
  --on-primary: #ffffff;
  --primary-subtle: #eef6f7;
  --success: #10b981;
  --error: #ef4444;
  --font-sans: "Manrope", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-space: "Space Grotesk", "Manrope", sans-serif;
}
[data-theme="dark"] {
  --background: #0f1115;
  --foreground: #f8fafc;
  --primary: #4fa3a8;
  --muted-foreground: #94a3b8;
  --card: #151820;
  --card-subtle: #1c202a;
  --border: #222734;
  --primary-subtle: rgba(79, 163, 168, 0.12);
  --success: #34d399;
  --error: #f87171;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { color-scheme: light; }
[data-theme="dark"] { color-scheme: dark; }
body {
  min-height: 100vh; display: flex; flex-direction: column;
  background: var(--background); color: var(--foreground);
  font-family: var(--font-sans); -webkit-font-smoothing: antialiased;
  transition: background-color .3s ease, color .3s ease; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
::selection { background: var(--primary); color: #fff; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { width: 100%; max-width: 72rem; margin: 0 auto; padding-inline: 1.5rem; }

.glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(44rem 30rem at 50% 35%, var(--primary-subtle), transparent 70%);
}

/* nav */
.nav { display: flex; align-items: center; justify-content: space-between; padding-block: 1.25rem; }
.brand { display: inline-flex; }
.logo { height: 1.75rem; width: auto; }
.logo-dark, .icon-sun { display: none; }
[data-theme="dark"] .logo-light, [data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .logo-dark, [data-theme="dark"] .icon-sun { display: block; }
.icon-btn {
  display: grid; place-items: center; width: 2.5rem; height: 2.5rem;
  border-radius: 9999px; border: 1px solid var(--border); background: var(--card);
  transition: background-color .15s, transform .15s;
}
.icon-btn:hover { background: var(--card-subtle); }
.icon-btn:active { transform: scale(.94); }

/* main */
.main { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: space-between; padding: 2rem 1.5rem 2.5rem; gap: 3rem; }
.center { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; width: 100%; max-width: 34rem; }
h1 {
  font-family: var(--font-space); font-weight: 700;
  font-size: clamp(2.75rem, 7.5vw, 6rem); line-height: 1.05; letter-spacing: -.04em;
}
.lead { margin-top: 1.25rem; color: var(--muted-foreground); font-size: 1.05rem; line-height: 1.7; }

.form { display: flex; flex-direction: column; gap: .75rem; width: 100%; margin-top: 2rem; }
.form input {
  flex: 1; height: 3rem; padding-inline: 1rem; border-radius: .75rem;
  border: 1.5px solid var(--border); background: var(--card); color: var(--foreground); font: inherit;
  transition: border-color .15s, box-shadow .15s;
}
.form input::placeholder { color: var(--muted-foreground); opacity: .7; }
.form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-subtle); }
.form input[aria-invalid="true"] { border-color: var(--error); }
.btn {
  height: 3rem; padding-inline: 1.5rem; border-radius: .75rem;
  background: var(--primary); color: var(--on-primary); font-weight: 700;
  transition: opacity .15s, transform .15s;
}
.btn:hover { opacity: .9; }
.btn:active { transform: scale(.98); }
.msg { min-height: 1.5rem; margin-top: .75rem; font-size: .9rem; font-weight: 600; }
.msg.ok { color: var(--success); }
.msg.err { color: var(--error); }

/* countdown (bottom) */
.count { display: flex; gap: .6rem; }
.count div {
  min-width: 4.2rem; padding: .75rem .5rem; text-align: center;
  border: 1px solid var(--border); border-radius: .75rem; background: var(--card);
}
.count b { display: block; font-family: var(--font-space); font-size: 1.5rem; font-variant-numeric: tabular-nums; }
.count span { font-size: .75rem; color: var(--muted-foreground); }

/* footer */
.foot { padding-block: 1.25rem; text-align: center; color: var(--muted-foreground); font-size: .875rem; border-top: 1px solid var(--border); }

@media (prefers-reduced-motion: reduce) { * { transition-duration: .01ms !important; } }
@media (min-width: 640px) {
  .wrap { padding-inline: 2rem; }
  .center { max-width: 56rem; }
  .lead { max-width: 36rem; }
  h1 { white-space: nowrap; }
  .form { flex-direction: row; max-width: 30rem; }
  .count { gap: 1rem; }
  .count div { min-width: 5.5rem; padding: 1rem .75rem; }
  .count b { font-size: 2rem; }
}