/* Base */
:root {
  --bg: #0b0c0f;
  --panel: #111318;
  --muted: #9aa4b2;
  --text: #e6e9ef;
  --green: #126b41; /* dark green for hero title */
  --accent: #31c48d;
  --border: #1f2430;
  --glow: rgba(49, 196, 141, 0.18);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 70% -10%, #0f1320 0%, var(--bg) 60%);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(8px);
  background: linear-gradient(180deg, rgba(11,12,15,0.9), rgba(11,12,15,0.6));
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand a, .brand { font-weight: 800; letter-spacing: 0.5px; color: #fff; text-decoration: none; }
.nav a { color: var(--muted); text-decoration: none; margin-left: 18px; }
.nav a:hover { color: #fff; }

/* Force navigation to show on mobile */
@media screen and (max-width: 768px) {
  .nav { 
    display: flex !important; 
    gap: 6px; 
    flex-wrap: wrap; 
    margin-top: 0;
  }
  .nav a, .nav button { 
    margin-left: 0 !important; 
    font-size: 13px; 
    padding: 6px 10px; 
  }
  .header-inner { 
    flex-direction: row !important; 
    align-items: center !important; 
    justify-content: space-between !important;
    gap: 8px; 
  }
}

/* Hero */
.hero {
  padding: 80px 0 48px;
}
.hero-title {
  margin: 0 0 12px;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.1;
  color: var(--green);
  text-align: center;
}
.hero-subtitle {
  text-align: center;
  color: var(--muted);
  max-width: 760px;
  margin: 0 auto 24px;
}
.hero-cta { display: flex; gap: 12px; justify-content: center; }

/* Sections */
.section { padding: 56px 0; }
.section.alt { background: var(--panel); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

h2 { font-size: clamp(22px, 3.6vw, 32px); margin: 0 0 12px; }
h3 { margin: 0 0 8px; font-size: 18px; }
p { margin: 0 0 12px; }

.grid.two-cols {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 12px;
  align-items: stretch;
}

.card {
  background: #0f1217;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  position: relative;
  transition: transform 140ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 12px;
  pointer-events: none;
  box-shadow: 0 0 0 0 var(--glow);
  transition: box-shadow 160ms ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: #2a3344;
  box-shadow: 0 10px 24px rgba(0,0,0,0.35);
}
.card:hover::after {
  box-shadow: 0 0 0 2px var(--glow), 0 8px 32px rgba(49, 196, 141, 0.08) inset;
}

.card.info dl { margin: 0; }
.card.info .row { display: grid; grid-template-columns: 110px 1fr; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.card.info .row:last-child { border-bottom: 0; }
.card.form label { display: grid; gap: 6px; margin-bottom: 10px; }
.card.form input { background: #0c0f14; border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 10px 12px; }

.checklist { padding-left: 18px; margin: 8px 0 0; }
.checklist li { margin: 6px 0; }

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  background: #1a1f2b;
  border: 1px solid var(--border);
  color: #fff;
  border-radius: 10px;
  text-decoration: none;
  transition: transform 120ms ease, filter 120ms ease;
}
.button.primary { background: linear-gradient(180deg, #1a824f, var(--green)); border-color: #0f5a36; }
.button:hover { filter: brightness(1.1); transform: translateY(-1px); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: #0b0d12; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; color: var(--muted); }

/* Responsive */
@media (max-width: 900px) {
  .grid.two-cols { grid-template-columns: 1fr; }
  .cards { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
}
@media (max-width: 768px) {
  .nav { display: flex !important; gap: 8px; flex-wrap: wrap; }
  .nav a, .nav button { margin-left: 0 !important; font-size: 14px; padding: 8px 12px; }
  .header-inner { flex-wrap: wrap; gap: 10px; padding: 12px 0; }
}
@media (max-width: 600px) {
  .cards { grid-template-columns: 1fr; }
  .nav { display: flex !important; gap: 6px; flex-wrap: wrap; }
  .nav a, .nav button { margin-left: 0 !important; font-size: 13px; padding: 6px 10px; }
  .header-inner { flex-wrap: wrap; gap: 8px; padding: 12px 0; }
  .brand { font-size: 18px; }
}
@media (max-width: 480px) {
  .nav { display: flex !important; gap: 4px; }
  .nav a, .nav button { font-size: 12px; padding: 5px 8px; }
  .header-inner { gap: 6px; padding: 10px 0; }
  .brand { font-size: 16px; }
}


/* Course cards micro-interaction */
.course { cursor: pointer; }
.course:hover { box-shadow: 0 8px 20px rgba(0,0,0,0.35); }