* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #0c0e14;
  --surface: #161923;
  --border: #252838;
  --text: #e2e4ea;
  --muted: #8b8fa4;
  --accent: #ef4444;
  --accent-glow: rgba(239, 68, 68, 0.15);
  --green: #34d399;
  --cyan: #22d3ee;
  --orange: #fb923c;
  --purple: #a78bfa;
  --pink: #f472b6;
  --blue: #60a5fa;
  --heading: #fff;
  --code-bg: #111320;
  --code-comment: #555;
}
[data-theme="light"] {
  --bg: #f5f6f8;
  --surface: #e8eaef;
  --border: #c8ccd4;
  --text: #1e2030;
  --heading: #111320;
  --muted: #4a5068;
  --accent: #dc2626;
  --accent-glow: rgba(220, 38, 38, 0.1);
  --green: #16a34a;
  --cyan: #0891b2;
  --orange: #ea580c;
  --purple: #9333ea;
  --pink: #db2777;
  --blue: #2563eb;
  --code-bg: #ffffff;
  --code-comment: #6b7280;
}
body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  height: 100vh;
}
.slide {
  display: none;
  flex-direction: column;
  justify-content: center;
  padding: 50px 100px 90px;
  height: 100vh;
  animation: fadeIn 0.35s ease;
  position: relative;
  overflow: hidden;
}
.slide.active { display: flex; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.slide.center { align-items: center; text-align: center; }
h1 {
  font-size: 3.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--heading) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.8rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
h2 {
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 1.2rem;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
p, li { font-size: 1.15rem; line-height: 1.7; color: var(--muted); }
ul { list-style: none; padding: 0; }
ul li { position: relative; padding-left: 1.5rem; margin-bottom: 0.6rem; }
ul li::before { content: '\2192'; position: absolute; left: 0; color: var(--accent); font-weight: 600; }
strong { color: var(--heading); font-weight: 600; }
.subtitle { font-size: 1.4rem; color: var(--muted); margin-bottom: 2rem; }
.callout {
  background: var(--accent-glow);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.4rem;
  border-radius: 0 8px 8px 0;
  margin-top: 1.5rem;
  font-size: 1.05rem;
  color: var(--heading);
}
.layout { display: flex; gap: 3rem; align-items: center; flex: 1; }
.layout .text { flex: 1; }
.layout .visual { flex: 1; display: flex; justify-content: center; align-items: center; }
.layout .visual svg { width: 100%; height: auto; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.5rem; }
.col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem;
}
.col h3 { margin-top: 0; }
.tag {
  display: inline-block;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-right: 0.3rem;
}
.tag.green { background: rgba(52, 211, 153, 0.15); color: var(--green); }
.tag.orange { background: rgba(251, 146, 60, 0.15); color: var(--orange); }
.tag.purple { background: rgba(167, 139, 250, 0.15); color: var(--purple); }
.tag.cyan { background: rgba(34, 211, 238, 0.15); color: var(--cyan); }
.tag.blue { background: rgba(96, 165, 250, 0.15); color: var(--blue); }
.tag.pink { background: rgba(244, 114, 182, 0.15); color: var(--pink); }
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0.6rem 0;
  overflow-x: auto;
}
pre .kw { color: var(--accent); }
pre .cls { color: var(--cyan); }
pre .fn { color: var(--green); }
pre .str { color: var(--orange); }
pre .num { color: var(--purple); }
pre .cm { color: var(--code-comment); }
pre .par { color: var(--pink); }
pre .op { color: var(--muted); }

.quiz-slide .quiz-answers { opacity: 0; transform: translateY(10px); transition: opacity 0.4s, transform 0.4s; pointer-events: none; }
.quiz-slide.step-1 .quiz-answers { opacity: 1; transform: translateY(0); pointer-events: auto; }
.quiz-slide .quiz-answer.correct { border-color: var(--border); box-shadow: none; font-weight: normal; }
.quiz-slide .quiz-answer.correct strong { font-weight: normal; color: var(--green); }
.quiz-slide.step-2 .quiz-answer.correct { border-color: var(--green); box-shadow: 0 0 15px rgba(52,211,153,0.2); }
.quiz-slide.step-2 .quiz-answer.correct strong { font-weight: 700; color: var(--heading); }
.quiz-slide .quiz-explanation { opacity: 0; transition: opacity 0.4s; }
.quiz-slide.step-2 .quiz-explanation { opacity: 1; }

.nav {
  position: fixed;
  bottom: 24px;
  right: 32px;
  display: flex;
  align-items: center;
  gap: 14px;
  z-index: 100;
}
.nav button {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px; height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  font-family: 'Outfit', sans-serif;
}
.nav button:hover { background: var(--accent); border-color: var(--accent); color: var(--heading); }
.nav button:disabled { opacity: 0.3; cursor: default; background: var(--surface); border-color: var(--border); color: var(--text); }
.nav .counter { font-size: 0.85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.nav .skip-quiz { font-size: 0.75rem; width: auto; padding: 0.4rem 0.8rem; border-radius: 6px; display: none; }
.nav .skip-quiz.visible { display: flex; }
.progress { position: fixed; top: 0; left: 0; height: 3px; background: var(--accent); transition: width 0.3s ease; z-index: 100; }

.visma-logo {
  position: fixed;
  bottom: 24px;
  left: 32px;
  z-index: 100;
  opacity: 0.7;
}

@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide.active li { animation: fadeIn 0.35s ease backwards; }
.slide.active li:nth-child(1) { animation-delay: 0.1s; }
.slide.active li:nth-child(2) { animation-delay: 0.2s; }
.slide.active li:nth-child(3) { animation-delay: 0.3s; }
.slide.active li:nth-child(4) { animation-delay: 0.4s; }
.slide.active li:nth-child(5) { animation-delay: 0.5s; }

.big-number { font-size: 7rem; font-weight: 800; color: var(--accent); line-height: 1; opacity: 0.15; position: absolute; right: 80px; top: 40px; }
.accent { color: var(--accent); }
.green-text { color: var(--green); }
.cyan-text { color: var(--cyan); }
.orange-text { color: var(--orange); }
.purple-text { color: var(--purple); }

.curriculum-list { columns: 2; column-gap: 3rem; }
.curriculum-list li { break-inside: avoid; }
.curriculum-list li.current { color: var(--accent); font-weight: 600; }
.curriculum-list li.current::before { content: '\25B6'; color: var(--accent); }

.access-table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.access-table th { background: var(--surface); color: var(--accent); font-weight: 600; text-align: left; padding: 0.6rem 1rem; border-bottom: 2px solid var(--accent); font-size: 0.95rem; }
.access-table td { padding: 0.5rem 1rem; border-bottom: 1px solid var(--border); color: var(--muted); font-size: 0.95rem; }
.access-table tr:hover td { background: rgba(239, 68, 68, 0.05); }

.mobile-warning {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  gap: 1.5rem;
}
.mobile-warning svg { opacity: 0.5; }
.mobile-warning h2 { font-size: 1.5rem; color: var(--heading); }
.mobile-warning p { color: var(--muted); font-size: 1rem; line-height: 1.6; max-width: 300px; }
.mobile-warning a { color: var(--accent); text-decoration: none; font-weight: 600; }
@media (max-width: 900px) {
  .mobile-warning { display: flex; }
  .slide, .nav, .progress, .visma-logo { display: none !important; }
}