:root {
  --bg: #0e1116;
  --surface: #161b22;
  --surface-2: #1d232c;
  --border: #2b3441;
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --accent: #4c8dff;
  --accent-dim: #23324b;
  --good: #3fb950;
  --warn: #d29922;
  --bad: #f85149;
  --radius: 14px;
  --maxw: 720px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  padding: 12px 16px calc(12px + env(safe-area-inset-top));
  padding-top: max(12px, env(safe-area-inset-top));
  background: rgba(14, 17, 22, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topbar__brand {
  background: none; border: 0; color: var(--text);
  font-size: 17px; font-weight: 700; letter-spacing: 0.2px;
}
.topbar__nav { display: flex; gap: 16px; flex-wrap: wrap; }
.topbar__nav a {
  color: var(--text-dim); text-decoration: none; font-size: 14px; font-weight: 600;
  padding: 4px 0;
}
.topbar__nav a:hover { color: var(--text); }

.hero {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 16px;
  flex: 1;
}
.hero__inner {
  text-align: center;
  padding-bottom: 40px;
}
.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 18px;
  padding: 6px 14px;
  border: 1px solid var(--accent-dim);
  background: var(--accent-dim);
  border-radius: 999px;
}
.hero h1 {
  font-size: clamp(28px, 6vw, 46px);
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 18px;
}
.grad {
  background: linear-gradient(120deg, var(--accent), #7c5cff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  color: var(--text-dim);
  font-size: 16px;
  max-width: 640px;
  margin: 0 auto 34px;
}

/* countdown */
.countdown {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 12px;
}
.countdown__unit {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  min-width: 84px;
}
.countdown__num {
  display: block;
  font-size: 34px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  line-height: 1;
}
.countdown__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
}
.countdown__note { color: var(--text-dim); font-size: 14px; margin-bottom: 34px; }
.countdown__note strong { color: var(--text); }

/* signup */
.signup {
  text-align: left;
  max-width: 460px;
  margin: 0 auto;
}
.signup__intro { color: var(--text-dim); font-size: 14px; margin-top: 6px; }
.signup__intro strong { color: var(--text); }
.signup__form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}
.signup__input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 13px 14px;
  font: inherit;
}
.signup__input:focus {
  outline: none;
  border-color: var(--accent);
}
.signup__status { margin-top: 12px; font-size: 14px; min-height: 20px; }
.signup__status.ok { color: var(--good); }
.signup__status.err { color: var(--bad); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.card__label {
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.7px;
  color: var(--accent); margin-bottom: 4px; font-weight: 700;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #fff; border: 0;
  padding: 13px 18px; border-radius: 10px;
  font-size: 15px; font-weight: 650; cursor: pointer;
  text-decoration: none;
  width: 100%;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* sections */
.how, .faculty {
  padding: 34px 0;
  border-top: 1px solid var(--border);
}
h2 { font-size: 24px; margin-bottom: 8px; font-weight: 800; }
.grid { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 560px) { .grid--2 { grid-template-columns: 1fr 1fr; } }

.faculty__list {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 8px;
}
.faculty__item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font-weight: 600;
  font-size: 14px;
}
.faculty__item span { color: var(--text-dim); font-weight: 800; width: 24px; }

.footer {
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

@media (max-width: 560px) {
  .countdown { gap: 8px; }
  .countdown__unit { padding: 12px 12px; min-width: 72px; }
  .countdown__num { font-size: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}