/* AI Engineering Hub — Static Styles */
:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #f1f5f9;
  --muted-fg: #64748b;
  --border: #e2e8f0;
  --card: #ffffff;
  --card-fg: #0f172a;
  --primary: #0891b2;
  --primary-fg: #ffffff;
  --accent: #f1f5f9;
  --cyan: #22d3ee;
  --slate-950: #020617;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Navbar */
.navbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 16px 24px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.nav-brand-icon {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700;
}
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 0.9rem; font-weight: 500; color: var(--muted-fg);
  transition: color 0.15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--fg); }
.nav-cta {
  padding: 8px 16px; background: var(--primary); color: #fff !important;
  border-radius: 8px; font-weight: 600 !important; font-size: 0.85rem !important;
}
.nav-cta:hover { background: #0e7490; }
.nav-toggle {
  display: none; padding: 8px; font-size: 1.4rem;
}
.mobile-menu { display: none; padding: 12px 24px 20px; border-top: 1px solid var(--border); }
.mobile-menu.open { display: block; }
.mobile-menu a { display: block; padding: 10px 0; color: var(--fg); font-weight: 500; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 8px;
  font-size: 0.9rem; font-weight: 600;
  transition: all 0.15s; cursor: pointer;
}
.btn-primary { background: var(--cyan); color: var(--slate-950); }
.btn-primary:hover { background: #67e8f9; }
.btn-outline-white { border: 1px solid rgba(255,255,255,0.2); color: #fff; }
.btn-outline-white:hover { background: rgba(255,255,255,0.1); }
.btn-primary-solid { background: var(--primary); color: #fff; }
.btn-primary-solid:hover { background: #0e7490; }
.btn-outline { border: 1px solid var(--border); color: var(--fg); }
.btn-outline:hover { background: var(--accent); }
.arrow::after { content: "→"; }

/* Hero */
.hero {
  position: relative; overflow: hidden;
  color: #fff;
}
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(to right, rgba(2,6,23,0.9), rgba(2,6,23,0.7), rgba(2,6,23,0.4));
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1200px; margin: 0 auto;
  padding: 128px 24px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 999px;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem; font-weight: 500; color: rgba(255,255,255,0.8);
  margin-bottom: 24px;
}
.hero-badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); }
.hero h1 {
  font-size: clamp(2.25rem, 5vw, 4.5rem);
  font-weight: 800; line-height: 1.1;
  max-width: 800px; margin-bottom: 24px;
}
.hero h1 .accent { color: var(--cyan); }
.hero p {
  font-size: 1.125rem; color: rgba(255,255,255,0.7);
  max-width: 560px; margin-bottom: 40px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }

/* Sections */
section.section { padding: 96px 0; }
.section-header {
  display: flex; flex-direction: column; gap: 16px;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700; letter-spacing: -0.02em;
}
.section-header p { color: var(--muted-fg); max-width: 480px; }
.section-link { color: var(--primary); font-weight: 600; font-size: 0.9rem; }
.section-link:hover { text-decoration: underline; }
@media (min-width: 768px) {
  .section-header { flex-direction: row; align-items: flex-end; justify-content: space-between; }
}

/* Course grid */
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 768px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

.course-card {
  border: 1px solid var(--border); border-radius: 16px;
  background: var(--card); overflow: hidden;
  display: flex; flex-direction: column;
  transition: box-shadow 0.2s;
}
.course-card:hover { box-shadow: 0 10px 25px rgba(0,0,0,0.08); }
.course-card-img {
  aspect-ratio: 4/3; overflow: hidden; background: var(--muted);
}
.course-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.course-card:hover .course-card-img img { transform: scale(1.05); }
.course-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.course-tag {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--primary); margin-bottom: 12px;
}
.course-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; }
.course-card p { font-size: 0.9rem; color: var(--muted-fg); flex: 1; }
.course-card .link { margin-top: 24px; color: var(--primary); font-weight: 600; font-size: 0.9rem; }

/* Stats */
.stats {
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: #f8fafc; padding: 64px 0;
}
.stats-row {
  display: flex; flex-wrap: wrap; gap: 32px; justify-content: space-between;
}
.stat { display: flex; align-items: center; gap: 16px; }
.stat-icon {
  width: 40px; height: 40px; border-radius: 8px;
  background: rgba(8,145,178,0.1); color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}
.stat-value { font-size: 1.25rem; font-weight: 700; }
.stat-label { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted-fg); }

/* Events preview */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 768px) { .grid-2 { grid-template-columns: 1fr 1fr; } }

.event-preview {
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--card); padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
}
.event-meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: 0.85rem; color: var(--muted-fg); align-items: center; }
.event-meta .sep { color: var(--border); }
.event-preview h3 { font-size: 1.25rem; font-weight: 700; }
.event-preview p { font-size: 0.9rem; color: var(--muted-fg); }
.event-preview .link { color: var(--primary); font-weight: 600; font-size: 0.9rem; }

/* CTA */
.cta-dark {
  background: var(--slate-950); color: #fff;
  padding: 96px 0; text-align: center;
}
.cta-dark h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 700; margin-bottom: 16px; }
.cta-dark p { color: rgba(255,255,255,0.6); font-size: 1.125rem; max-width: 640px; margin: 0 auto 40px; }
.cta-dark .hero-actions { justify-content: center; }

/* Footer */
footer {
  border-top: 1px solid var(--border); background: #fff;
  padding: 48px 0;
}
.footer-inner {
  display: flex; flex-direction: column; align-items: center; gap: 24px;
  text-align: center;
}
@media (min-width: 768px) {
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}
.footer-inner p { font-size: 0.875rem; color: var(--muted-fg); }

/* Page headers */
.page-header {
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
  padding: 80px 0;
}
.page-header .badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(8,145,178,0.1); color: var(--primary);
  padding: 4px 12px; border-radius: 999px;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 16px;
}
.page-header h1 {
  font-size: clamp(2.25rem, 4vw, 3rem);
  font-weight: 800; letter-spacing: -0.02em; margin-bottom: 16px;
}
.page-header p { font-size: 1.125rem; color: var(--muted-fg); max-width: 640px; }

/* Course detail */
.course-detail {
  display: flex; flex-direction: column; gap: 32px;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
.course-detail:last-child { border-bottom: none; }
@media (min-width: 900px) {
  .course-detail { flex-direction: row; align-items: flex-start; gap: 48px; }
  .course-detail.reverse { flex-direction: row-reverse; }
  .course-detail-img-wrap { flex: 0 0 42%; }
  .course-detail-body { flex: 1; }
}
.course-detail-img-wrap img {
  border-radius: 16px; border: 1px solid var(--border);
  aspect-ratio: 4/3; object-fit: cover; width: 100%;
}
.course-detail h2 { font-size: 1.875rem; font-weight: 700; margin-bottom: 12px; }
.course-detail > .course-detail-body > p { color: var(--muted-fg); margin-bottom: 24px; }
.course-facts {
  display: flex; flex-wrap: wrap; gap: 24px;
  margin-bottom: 32px; font-size: 0.9rem; color: var(--muted-fg);
}
.course-facts span { display: inline-flex; align-items: center; gap: 8px; }
.course-facts .icon { color: var(--primary); }
.topics-title {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 16px;
}
.topics { display: grid; grid-template-columns: 1fr; gap: 12px; margin-bottom: 32px; }
@media (min-width: 600px) { .topics { grid-template-columns: 1fr 1fr; } }
.topics li {
  display: flex; gap: 12px; font-size: 0.9rem; color: var(--muted-fg);
}
.topics li::before {
  content: "✓"; color: var(--primary); font-weight: 700; flex-shrink: 0;
}

/* About */
.two-col {
  display: grid; grid-template-columns: 1fr; gap: 48px;
  align-items: center;
}
@media (min-width: 900px) { .two-col { grid-template-columns: 1fr 1fr; } }
.two-col h2 { font-size: 1.875rem; font-weight: 700; margin-bottom: 24px; }
.two-col .story p {
  color: var(--muted-fg); margin-bottom: 16px; line-height: 1.7;
}
.quote-card {
  background: #f8fafc; border: 1px solid var(--border);
  border-radius: 16px; padding: 40px;
}
.quote-card blockquote {
  font-size: 1.25rem; font-style: italic; font-weight: 500; line-height: 1.6; margin-bottom: 24px;
}
.quote-card .author { display: flex; align-items: center; gap: 12px; }
.quote-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.8rem;
}

.section-alt { background: #f8fafc; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.center-header { text-align: center; margin-bottom: 48px; }
.center-header h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 700; margin-bottom: 12px; }
.center-header p { color: var(--muted-fg); }

.pillar-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px;
}
.pillar-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: rgba(8,145,178,0.1); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; margin-bottom: 20px;
}
.pillar-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }
.pillar-card p { font-size: 0.9rem; color: var(--muted-fg); line-height: 1.6; }

.values-grid {
  display: grid; grid-template-columns: 1fr; gap: 24px;
}
@media (min-width: 600px) { .values-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 900px) { .values-grid { grid-template-columns: repeat(3, 1fr); } }
.value-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 24px;
  transition: box-shadow 0.15s;
}
.value-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.value-icon {
  width: 40px; height: 40px; border-radius: 8px;
  background: rgba(8,145,178,0.1); color: var(--primary);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.value-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.value-card p { font-size: 0.9rem; color: var(--muted-fg); line-height: 1.6; }

/* Events list */
.events-list { display: flex; flex-direction: column; gap: 40px; }
.event-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px;
  transition: box-shadow 0.2s;
}
.event-card:hover { box-shadow: 0 8px 20px rgba(0,0,0,0.06); }
.event-card-top {
  display: flex; flex-direction: column; gap: 24px;
}
@media (min-width: 768px) {
  .event-card-top { flex-direction: row; justify-content: space-between; align-items: flex-start; }
}
.event-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; align-items: center; }
.event-type-badge {
  background: rgba(8,145,178,0.1); color: var(--primary);
  padding: 4px 12px; border-radius: 999px;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em;
}
.event-tags .meta { font-size: 0.8rem; color: var(--muted-fg); }
.event-card h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; }
@media (min-width: 768px) { .event-card h2 { font-size: 1.75rem; } }
.event-info { display: flex; flex-wrap: wrap; gap: 16px; font-size: 0.9rem; color: var(--muted-fg); margin-bottom: 16px; }
.event-card > .event-card-top > .flex-1 > p { color: var(--muted-fg); font-size: 0.9rem; line-height: 1.6; margin-bottom: 20px; max-width: 720px; }
.flex-1 { flex: 1; }
.highlights-title {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 8px;
}
.highlights { display: flex; flex-wrap: wrap; gap: 8px; }
.highlights li {
  background: var(--muted); padding: 6px 12px; border-radius: 6px;
  font-size: 0.75rem; font-weight: 500; color: var(--muted-fg);
}