/* ============================================
   AI ACADEMY — Neobrutalist Design System
   ============================================ */

:root {
  --bg: #fef6e4;
  --ink: #0a0a0a;
  --shadow: #0a0a0a;
  --pink: #ff6b9d;
  --yellow: #ffe45e;
  --blue: #7dd3fc;
  --green: #a3e635;
  --orange: #fb923c;
  --purple: #c084fc;
  --red: #ff5252;
  --white: #ffffff;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-weight: 600;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(rgba(10,10,10,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10,10,10,0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 24px; }

a { color: var(--ink); }

/* ============ NAV ============ */
nav.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 12px;
}
nav.top .logo {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.5px;
  background: var(--yellow);
  padding: 8px 14px;
  border: 3px solid var(--ink);
  text-decoration: none;
  display: inline-block;
  transform: rotate(-1deg);
  transition: transform 0.15s;
}
nav.top .logo:hover { transform: rotate(1deg) scale(1.03); }

nav.top ul { display: flex; gap: 8px; list-style: none; flex-wrap: wrap; }
nav.top a.link {
  text-decoration: none;
  color: var(--ink);
  font-weight: 800;
  padding: 8px 14px;
  border: 3px solid var(--ink);
  background: var(--white);
  font-size: 14px;
  transition: transform 0.1s, box-shadow 0.1s, background 0.1s;
  display: inline-block;
}
nav.top a.link:hover {
  background: var(--pink);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--shadow);
}
nav.top a.link.active { background: var(--green); box-shadow: 4px 4px 0 var(--shadow); }

/* ============ HERO ============ */
.hero {
  border: 4px solid var(--ink);
  box-shadow: 12px 12px 0 var(--shadow);
  padding: 56px 40px;
  margin-bottom: 56px;
  position: relative;
  overflow: hidden;
}
.hero.pink { background: var(--pink); }
.hero.blue { background: var(--blue); }
.hero.yellow { background: var(--yellow); }
.hero.green { background: var(--green); }
.hero.orange { background: var(--orange); }
.hero.purple { background: var(--purple); }

.hero h1 {
  font-size: clamp(40px, 7vw, 88px);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -2px;
  margin-bottom: 24px;
  text-transform: uppercase;
}
.hero h1 .pop {
  background: var(--yellow);
  padding: 0 14px;
  border: 4px solid var(--ink);
  display: inline-block;
  transform: rotate(-2deg);
  box-shadow: 5px 5px 0 var(--ink);
}
.hero h1 .pop.alt { background: var(--green); transform: rotate(2deg); }
.hero p.lede {
  font-size: 20px;
  max-width: 680px;
  margin-bottom: 32px;
  font-weight: 600;
}
.hero .doodle {
  position: absolute;
  font-size: 80px;
  font-weight: 900;
  opacity: 0.15;
  pointer-events: none;
}

/* ============ BUTTONS ============ */
.btn-row { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 16px 28px;
  font-size: 17px;
  font-weight: 900;
  text-decoration: none;
  color: var(--ink);
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 6px 6px 0 var(--shadow);
  cursor: pointer;
  text-transform: uppercase;
  transition: transform 0.1s, box-shadow 0.1s;
  font-family: inherit;
}
.btn:hover { transform: translate(-3px, -3px); box-shadow: 9px 9px 0 var(--shadow); }
.btn:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--shadow); }
.btn.primary { background: var(--green); }
.btn.pink { background: var(--pink); }
.btn.yellow { background: var(--yellow); }
.btn.blue { background: var(--blue); }

/* ============ SECTIONS ============ */
section { margin-bottom: 64px; }
.section-title {
  font-size: 36px;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 28px;
  display: inline-block;
  background: var(--ink);
  color: var(--bg);
  padding: 8px 18px;
  border: 4px solid var(--ink);
  transform: rotate(-1deg);
  letter-spacing: -0.5px;
}
.section-title.alt { background: var(--pink); color: var(--ink); transform: rotate(1deg); }
.section-sub {
  font-size: 17px;
  max-width: 720px;
  margin-bottom: 32px;
  font-weight: 600;
}

/* ============ CARDS ============ */
.grid { display: grid; gap: 24px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.card {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  padding: 24px;
  transition: transform 0.15s, box-shadow 0.15s;
  position: relative;
}
.card:hover { transform: translate(-4px, -4px); box-shadow: 12px 12px 0 var(--shadow); }
.card.pink { background: var(--pink); }
.card.blue { background: var(--blue); }
.card.yellow { background: var(--yellow); }
.card.green { background: var(--green); }
.card.orange { background: var(--orange); }
.card.purple { background: var(--purple); }
.card.dark { background: var(--ink); color: var(--bg); }
.card.dark a { color: var(--yellow); }
.card.dark .more { color: var(--yellow); border-bottom-color: var(--yellow); }

.card .icon {
  font-size: 24px;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--bg);
  border: 3px solid var(--ink);
  margin-bottom: 16px;
  font-weight: 900;
}
.card.dark .icon { background: var(--yellow); color: var(--ink); }
.card h3 {
  font-size: 22px;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}
.card p { font-size: 15px; font-weight: 600; line-height: 1.55; }
.card .more {
  margin-top: 14px;
  display: inline-block;
  font-weight: 900;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 3px solid var(--ink);
  padding-bottom: 2px;
}

/* ============ INFO BOX ============ */
.info-box {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  padding: 28px;
  margin-bottom: 28px;
}
.info-box h3 {
  font-size: 24px;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: inline-block;
  background: var(--yellow);
  border: 3px solid var(--ink);
  padding: 4px 12px;
}
.info-box p { font-size: 16px; margin-bottom: 12px; }
.info-box ul { padding-left: 22px; margin-bottom: 12px; }
.info-box li { font-size: 16px; margin-bottom: 8px; font-weight: 600; }
.info-box code {
  background: var(--ink);
  color: var(--green);
  padding: 2px 8px;
  font-family: 'Courier New', monospace;
  border: 2px solid var(--ink);
  font-size: 14px;
}

/* ============ CODE BLOCK ============ */
pre.code {
  background: var(--ink);
  color: #e6e6e6;
  border: 4px solid var(--ink);
  box-shadow: 6px 6px 0 var(--shadow);
  padding: 20px;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  line-height: 1.6;
  overflow-x: auto;
  margin: 16px 0;
  white-space: pre;
}
pre.code .k { color: var(--pink); }
pre.code .s { color: var(--green); }
pre.code .c { color: #888; }
pre.code .f { color: var(--yellow); }

/* ============ TIMELINE ============ */
.timeline {
  position: relative;
  padding: 20px 0;
}
.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 24px;
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 6px 6px 0 var(--shadow);
  padding: 20px;
  transition: transform 0.15s, box-shadow 0.15s;
}
.timeline-item:hover { transform: translate(-3px, -3px); box-shadow: 9px 9px 0 var(--shadow); }
.timeline-year {
  background: var(--ink);
  color: var(--yellow);
  font-weight: 900;
  padding: 10px 14px;
  border: 3px solid var(--ink);
  font-size: 18px;
  flex-shrink: 0;
  min-width: 80px;
  text-align: center;
}
.timeline-item h4 {
  font-size: 18px;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.timeline-item p { font-size: 15px; font-weight: 600; }

/* ============ TABLE ============ */
.compare-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  margin: 20px 0;
}
.compare-table th, .compare-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 3px solid var(--ink);
  font-size: 15px;
}
.compare-table th {
  background: var(--ink);
  color: var(--bg);
  font-weight: 900;
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.5px;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:nth-child(even) td { background: rgba(0,0,0,0.04); }
.compare-table .tag {
  display: inline-block;
  padding: 3px 10px;
  border: 2px solid var(--ink);
  font-weight: 900;
  font-size: 12px;
  text-transform: uppercase;
}
.compare-table .tag.green { background: var(--green); }
.compare-table .tag.yellow { background: var(--yellow); }
.compare-table .tag.pink { background: var(--pink); }
.compare-table .tag.blue { background: var(--blue); }

/* ============ FOOTER ============ */
footer.bottom {
  background: var(--ink);
  color: var(--bg);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  padding: 32px;
  text-align: center;
  margin-top: 40px;
}
footer.bottom p { font-weight: 700; margin-bottom: 8px; }
footer.bottom a { color: var(--yellow); }
footer.bottom .made {
  display: inline-block;
  background: var(--yellow);
  color: var(--ink);
  padding: 6px 14px;
  border: 3px solid var(--bg);
  margin-top: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

/* ============ INTERACTIVE / DEMO ============ */
.demo {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  padding: 28px;
  margin: 24px 0;
}
.demo h4 {
  font-size: 18px;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: inline-block;
  background: var(--blue);
  border: 3px solid var(--ink);
  padding: 4px 12px;
}
.demo input, .demo textarea {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  border: 4px solid var(--ink);
  background: var(--bg);
  margin-bottom: 16px;
  outline: none;
}
.demo input:focus, .demo textarea:focus { background: var(--yellow); }

.token-out { display: flex; flex-wrap: wrap; gap: 6px; min-height: 40px; }
.tok {
  display: inline-block;
  padding: 6px 10px;
  border: 3px solid var(--ink);
  font-weight: 900;
  font-size: 14px;
  font-family: 'Courier New', monospace;
}

/* ============ AGENT LOOP DIAGRAM ============ */
.agent-loop {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0;
}
.loop-node {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 6px 6px 0 var(--shadow);
  padding: 18px 24px;
  font-weight: 900;
  text-transform: uppercase;
  text-align: center;
  min-width: 130px;
  transition: all 0.4s ease;
}
.loop-node.active {
  background: var(--green);
  transform: translate(-4px, -4px) scale(1.05);
  box-shadow: 10px 10px 0 var(--shadow);
}
.loop-arrow {
  font-size: 32px;
  font-weight: 900;
  color: var(--ink);
}

/* ============ ANIMATIONS ============ */
@keyframes pop-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.pop-in { animation: pop-in 0.5s ease forwards; }

@keyframes wiggle {
  0%, 100% { transform: rotate(-1deg); }
  50% { transform: rotate(1deg); }
}
.wiggle { animation: wiggle 3s ease-in-out infinite; }

@keyframes pulse-shadow {
  0%, 100% { box-shadow: 8px 8px 0 var(--shadow); }
  50% { box-shadow: 12px 12px 0 var(--shadow); }
}
.pulse { animation: pulse-shadow 2s ease-in-out infinite; }

/* fade in on scroll */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ============ GLOSSARY ============ */
.glossary-list { display: grid; gap: 14px; }
.term {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 5px 5px 0 var(--shadow);
  padding: 18px 22px;
  transition: transform 0.15s, box-shadow 0.15s;
}
.term:hover { transform: translate(-3px, -3px); box-shadow: 8px 8px 0 var(--shadow); }
.term h4 {
  font-size: 18px;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.term h4 .letter {
  background: var(--pink);
  border: 3px solid var(--ink);
  padding: 2px 10px;
  margin-right: 10px;
  display: inline-block;
}
.term p { font-size: 15px; font-weight: 600; }
.term.hide { display: none; }

/* ============ STATS ============ */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; margin: 24px 0; }
.stat {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 6px 6px 0 var(--shadow);
  padding: 20px;
  text-align: center;
}
.stat .num {
  font-size: 44px;
  font-weight: 900;
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}
.stat .lbl {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}
.stat.pink { background: var(--pink); }
.stat.yellow { background: var(--yellow); }
.stat.green { background: var(--green); }
.stat.blue { background: var(--blue); }

/* ============ DIAGRAMS ============ */
.diagram-wrap {
  background: var(--white);
  border: 4px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  padding: 24px;
  margin: 24px 0;
  text-align: center;
  overflow-x: auto;
}
.diagram-wrap svg { max-width: 100%; height: auto; }
.diagram-wrap .caption {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  display: inline-block;
  background: var(--ink);
  color: var(--bg);
  padding: 4px 10px;
  border: 2px solid var(--ink);
}

/* ============ BACK TO TOP ============ */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 56px;
  height: 56px;
  background: var(--yellow);
  color: var(--ink);
  border: 4px solid var(--ink);
  box-shadow: 6px 6px 0 var(--shadow);
  font-size: 26px;
  font-weight: 900;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  font-family: inherit;
  transition: transform 0.1s, box-shadow 0.1s;
}
.to-top.show { display: flex; }
.to-top:hover { transform: translate(-2px, -2px); box-shadow: 9px 9px 0 var(--shadow); background: var(--green); }
.to-top:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--shadow); }

/* ============ RESPONSIVE ============ */
@media (max-width: 640px) {
  .wrap { padding: 16px; }
  .hero { padding: 36px 24px; }
  nav.top { padding: 12px 16px; }
  nav.top ul { width: 100%; }
  nav.top a.link { padding: 6px 10px; font-size: 13px; }
  .section-title { font-size: 26px; }
}