:root {
  --font-body: 'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji;
  --font-heading: 'Space Grotesk', 'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji;
  --bg: #121212;
  --bg-elev: #18181f;
  --card: #1f2028;
  --text: #f5f6fb;
  --muted: #a5adc6;
  --primary: #70b8ff;
  --primary-contrast: #071326;
  --border: #242634;
  --shadow: 0 6px 24px rgba(6, 8, 16, 0.35);
  --shadow-hover: 0 14px 40px rgba(7, 11, 25, 0.55);
}

[data-theme="light"] {
  --bg: #f5f6fb;
  --bg-elev: #fdfdff;
  --card: #ffffff;
  --text: #111827;
  --muted: #5b6072;
  --primary: #2563eb;
  --primary-contrast: #f0f6ff;
  --border: #e4e7f1;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
  --shadow-hover: 0 25px 40px rgba(15, 23, 42, 0.15);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

a { color: var(--primary); text-decoration: none; transition: color 0.2s ease, opacity 0.2s ease; }
a:hover { opacity: 0.85; }
.link { font-weight: 500; }
button,
.button,
.theme-toggle,
.tag {
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(18, 18, 18, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
[data-theme="light"] .site-header { background: rgba(245, 246, 251, 0.92); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
  color: var(--text);
  font-family: var(--font-heading);
}
.nav a {
  margin-left: 18px;
  color: var(--text);
  opacity: 0.7;
  position: relative;
  padding-bottom: 6px;
}
.nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.nav a:hover { opacity: 1; }
.nav a[aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
  opacity: 1;
}
.nav a[aria-current="page"]::after {
  opacity: 1;
  transform: translateY(0);
}
.theme-toggle {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
}
.theme-toggle:hover { transform: translateY(-1px); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 64px 0 32px;
}
.hero-text h1 {
  font-family: var(--font-heading);
  font-size: clamp(40px, 5vw, 54px);
  line-height: 1.05;
  margin: 12px 0 14px;
}
.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0;
}
.subtitle { color: var(--muted); margin: 0 0 12px; }
.lede { font-size: 1.08rem; color: var(--text); opacity: 0.92; margin-top: 0; }
.actions { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }
.socials { margin-top: 18px; display: flex; gap: 14px; flex-wrap: wrap; }
.socials a { display: inline-flex; align-items: center; gap: 0; padding: 4px; }
.icon { width: 18px; height: 18px; display: inline-block; }
.icon svg { width: 18px; height: 18px; fill: currentColor; stroke: none; }
.hero-media { display: flex; justify-content: center; }
.hero-img {
  width: 260px;
  height: 260px;
  object-fit: cover;
  border-radius: 50%;
  border: 6px solid var(--bg);
  box-shadow: var(--shadow);
  background: var(--bg);
}
.hero-portrait {
  position: relative;
  padding: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(112, 184, 255, 0.9), rgba(151, 71, 255, 0.9));
}
.hero-cta { margin-top: 24px; display: flex; gap: 16px; flex-wrap: wrap; }

/* Sections */
.section { padding: 28px 0 48px; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; }
.section h2 { margin: 0 0 12px; }

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  padding: 11px 20px;
  border-radius: 999px;
  font-weight: 600;
}
.button:hover { text-decoration: none; }
.button.primary { background: var(--primary); color: #050c1a; border-color: transparent; }
.button.secondary { background: transparent; color: var(--text); }
.button.primary:hover,
.button.secondary:hover {
  transform: translateY(-1px);
}
.button.secondary:hover {
  background: var(--bg-elev);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.emoji-burst {
  position: fixed;
  z-index: 1000;
  pointer-events: none;
  animation: emoji-pop 1s ease-out forwards;
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.4));
  will-change: transform, opacity;
}

@keyframes emoji-pop {
  0% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(0.4) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx, 0px), var(--dy, -140px)) scale(1.2) rotate(var(--spin, 180deg));
  }
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 18px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  min-height: 100%;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.card a { color: inherit; }
.card--highlighted { border-color: var(--primary); }
.card-badge {
  align-self: flex-start;
  background: var(--primary);
  color: var(--primary-contrast);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border-radius: 999px;
}
.card-media { position: relative; display: block; }
.card-media img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  display: block;
}
.card-media img[src*="learning-journey-ai-logo"] { object-fit: contain; padding: 20px; background: var(--bg-elev); }
.card-body { padding: 18px; display: flex; gap: 12px; flex-direction: column; flex: 1; }
.card h3 { margin: 0; font-size: 1.15rem; font-family: var(--font-heading); }
.card .desc { color: var(--muted); margin: 0; }
.pill-list { display: flex; gap: 8px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.pill-list li {
  border: none;
  background: rgba(112, 184, 255, 0.15);
  color: var(--primary);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.78rem;
}
[data-theme="light"] .pill-list li { background: rgba(37, 99, 235, 0.12); color: #1d4ed8; }
.card-actions { display: flex; gap: 10px; }

/* Filters */
.filters { display: flex; gap: 12px; align-items: center; margin: 12px 0 18px; flex-wrap: wrap; }
#search,
#presentationSearch {
  flex: 1;
  min-width: 220px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
}
.tag-filters { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
}
.tag.active { background: var(--primary); color: var(--primary-contrast); border-color: transparent; }


/* Contact */
.contact .contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.contact .contact-card { border: 1px solid var(--border); background: var(--bg-elev); border-radius: 12px; padding: 16px; }
.contact .contact-card ul a { display: inline-flex; align-items: center; gap: 8px; }

/* Visually hidden but accessible text */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}
.contact label { display: grid; gap: 6px; margin-bottom: 10px; }
.contact input, .contact textarea { border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); padding: 10px 12px; border-radius: 10px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 16px 0; margin-top: 24px; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; }
.footer-links a { margin-left: 14px; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }

/* Responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; text-align: left; }
  .hero-media { justify-content: flex-start; }
  .hero-img { width: 200px; height: 200px; }
  .contact .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .hero-cta { flex-direction: column; align-items: stretch; }
}