:root {
  --bg: #111827;
  --surface: #1f2937;
  --surface-hover: #263244;
  --border: #374151;
  --text: #f9fafb;
  --muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --radius: 0.5rem;
  --max-w: 1100px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { color: var(--accent-hover); }

/* ── Navigation ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(17, 24, 39, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.nav-brand:hover { color: var(--accent); }

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }

/* ── Main ── */
main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* ── Hero ── */
.hero {
  padding: 5rem 0 3.5rem;
  text-align: center;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero h1 span {
  color: var(--accent);
}

.hero-subtitle {
  margin: 0 0 1.25rem;
  font-size: 1.1rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-weight: 500;
}

.hero-desc {
  max-width: 560px;
  margin: 0 auto;
  color: #d1d5db;
  font-size: 1.05rem;
}

/* ── Section headings ── */
.section-heading {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
  color: var(--text);
  border-left: 3px solid var(--accent);
  padding-left: 0.75rem;
}

/* ── Card Grid ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.15s, background 0.15s, box-shadow 0.15s;
}

.card:hover {
  background: var(--surface-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.card-icon {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.card h3 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  flex: 1;
}

.card-link {
  margin-top: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
}
.card-link:hover { color: var(--accent-hover); }
.card-link::after { content: " →"; }

/* ── Announcements ── */
.announcements {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 3.5rem;
}

.announcement-item {
  display: flex;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}
.announcement-item:last-child { border-bottom: none; }

.announcement-date {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  padding-top: 0.15rem;
  min-width: 70px;
}

.announcement-text {
  font-size: 0.95rem;
  color: #e5e7eb;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  text-align: center;
}

footer p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}