/* Colorful gradient theme + accessible contrast */
:root {
  --bg-gradient: linear-gradient(135deg,#0ea5e9 0%, #8b5cf6 50%, #ef4444 100%);
  --bg-card: #0b1021;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #22d3ee;
  --accent-2: #f59e0b;
  --shadow: rgba(0,0,0,0.25);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji", "Segoe UI Symbol";
  background: var(--bg-gradient) fixed;
  min-height: 100%;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem;
}

/* Header / Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(6px);
  background: rgba(9, 11, 30, 0.6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.brand {
  display: flex; align-items: center; gap: .75rem;
}
.brand img {
  width: 40px; height: 40px; border-radius: 50%;
  box-shadow: 0 6px 16px var(--shadow);
}
.brand h1 {
  font-size: 1.1rem; margin: 0; letter-spacing: .6px;
  font-weight: 700;
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .75rem 1.25rem;
}
.nav ul {
  display: flex; gap: .75rem; list-style: none; margin: 0; padding: 0;
  flex-wrap: wrap;
}
.nav a {
  display: inline-block;
  padding: .5rem .75rem;
  border-radius: 999px;
  color: var(--text);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.nav a:hover { transform: translateY(-1px); background: rgba(255,255,255,0.12); }
.nav a.active {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #0a0a0a; font-weight: 700; box-shadow: 0 8px 20px var(--shadow);
}

/* Hero */
.hero {
  padding: 3rem 1.25rem 2rem;
  text-align: center;
}
.hero h2 {
  margin: 0 0 .5rem 0; font-size: 2.1rem;
  text-shadow: 0 6px 18px var(--shadow);
}
.hero p {
  color: var(--muted);
  max-width: 850px; margin: .5rem auto 0 auto;
}

/* Cards / Sections */
.section {
  margin: 1rem auto 2.5rem;
}
.card-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(12, 1fr);
}
.card {
  grid-column: span 12;
  background: rgba(9, 11, 30, 0.75);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  padding: 1rem 1rem 1.25rem;
  box-shadow: 0 12px 28px var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 18px 42px var(--shadow); }
.card h3 { margin-top: .25rem; margin-bottom: .5rem; }
.card p { color: var(--muted); }

/* Responsive columns */
@media (min-width: 640px) {
  .card.sm-6 { grid-column: span 6; }
}
@media (min-width: 960px) {
  .card.md-4 { grid-column: span 4; }
  .card.md-6 { grid-column: span 6; }
}

/* Lists in cards */
.card ul { margin: .5rem 0 0 0; padding-left: 1.25rem; }
.card li { margin: .35rem 0; }

/* Footer */
.footer {
  margin-top: 2rem; padding: 2rem 1.25rem;
  text-align: center;
  color: var(--muted);
}
.footer small { display: block; opacity: .8; }

/* Decorative separators */
.hr {
  height: 1px; border: none;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  margin: 1.25rem 0;
}

/* Page transition */
.page-enter {
  opacity: 0; transform: translateY(8px) scale(.996);
  animation: enter .45s ease forwards;
}
@keyframes enter {
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Badges */
.badge {
  display: inline-block; padding: .25rem .5rem; border-radius: 999px;
  font-size: .75rem; font-weight: 700; color: #0a0a0a;
  background: linear-gradient(90deg, #22d3ee, #f59e0b);
  margin-bottom: .5rem;
}