/* CreezyCreates — the illustrated engineering notebook */
:root {
  --ink: #111827;
  --ink-2: #1F2937;
  --indigo: #5B4BFF;
  --indigo-d: #4535E0;
  --indigo-soft: #EEEBFF;
  --amber: #FFB85C;
  --amber-soft: #FFE7C2;
  --paper: #FAF7F0;
  --paper-2: #F3EEE3;
  --card: #FFFDF8;
  --slate: #5B6475;
  --line: rgba(17, 24, 39, .14);
  --grid: rgba(91, 75, 255, .055);
  --sans: 'DM Sans', system-ui, sans-serif;
  --serif: 'Fraunces', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --wrap: 1200px;
  --read: 760px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--sans); font-size: 17px; line-height: 1.6; color: var(--ink);
  background-color: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-font-smoothing: antialiased;
}
body::after { content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 100; opacity: .35; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.4 0 0 0 0 0.35 0 0 0 0 0.25 0 0 0 .08 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--indigo); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
a:hover { color: var(--indigo-d); }
:focus-visible { outline: 3px solid var(--indigo); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--amber); color: var(--ink); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.skip-link { position: absolute; left: 12px; top: -60px; z-index: 200; background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 6px; }
.skip-link:focus { top: 12px; }
.mono { font-family: var(--mono); letter-spacing: -.01em; }
.small { font-size: .84rem; }
.muted { color: var(--slate); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 clamp(20px, 4vw, 40px); }
.wrap-read { max-width: calc(var(--read) + 80px); margin: 0 auto; padding: 0 clamp(20px, 4vw, 40px); }
main:focus { outline: none; }

/* type */
.display-xl, .display-lg, .display-md, .display-sm { font-family: var(--serif); font-weight: 600; letter-spacing: -.025em; line-height: 1.04; margin: 0 0 .4em; font-variation-settings: 'SOFT' 50, 'WONK' 1; }
.display-xl { font-size: clamp(2.5rem, 6vw, 4.9rem); }
.display-lg { font-size: clamp(2rem, 4.2vw, 3.25rem); }
.display-md { font-size: clamp(1.6rem, 3vw, 2.3rem); }
.display-sm { font-size: clamp(1.3rem, 2.2vw, 1.7rem); line-height: 1.15; }
.lede { font-size: clamp(1.06rem, 1.5vw, 1.24rem); color: var(--ink-2); max-width: 60ch; }
.kicker { font-size: .78rem; text-transform: lowercase; color: var(--indigo); margin: 0 0 1rem; letter-spacing: .02em; }
.kicker.on-dark { color: var(--amber); }
.serif-italic { font-family: var(--serif); font-style: italic; font-size: 1.15rem; }
.hand { font-family: var(--serif); font-style: italic; font-size: 17px; fill: var(--ink); color: var(--slate); }
.hand-num { font-family: var(--mono); font-size: 12px; fill: var(--indigo); font-weight: 600; }
.small-hand { font-size: 14px; }
.annot { font-size: .74rem; color: var(--slate); margin-top: .7rem; }
.marker { font-style: italic; background: linear-gradient(transparent 58%, var(--amber) 58%, var(--amber) 90%, transparent 90%); padding: 0 .08em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.narrow { max-width: 16ch; }
.link-arrow { font-weight: 600; text-decoration: none; color: var(--ink); border-bottom: 2px solid var(--amber); padding-bottom: 2px; transition: border-color .2s; white-space: nowrap; }
.link-arrow:hover { border-color: var(--indigo); color: var(--indigo); }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--indigo); cursor: pointer; text-decoration: underline; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: .5em; font: 600 .97rem/1 var(--sans); padding: .92em 1.35em; border-radius: 10px; border: 1.5px solid var(--ink); text-decoration: none; cursor: pointer; transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .2s; }
.btn-sm { padding: .66em 1em; font-size: .88rem; }
.btn-primary { background: var(--indigo); color: #FFFDF8; box-shadow: 3px 3px 0 var(--ink); }
.btn-primary:hover { color: #FFFDF8; transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn-primary:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn-amber { background: var(--amber); color: var(--ink); box-shadow: 3px 3px 0 var(--ink); }
.btn-amber:hover { color: var(--ink); transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--card); color: var(--ink); }
.btn-ghost-dark { background: transparent; color: var(--paper); border-color: rgba(250,247,240,.4); }
.btn-ghost-dark:hover { border-color: var(--paper); color: var(--paper); }
.btn[disabled] { opacity: .6; cursor: progress; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 1.8rem; }

/* header */
.preview-bar { background: var(--amber); padding: 8px 20px; font-size: .88rem; text-align: center; }
.progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 60; pointer-events: none; }
.progress span { display: block; height: 100%; background: var(--indigo); transform-origin: 0 50%; transform: scaleX(0); }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(250, 247, 240, .9); backdrop-filter: blur(10px); border-bottom: 1px solid transparent; transition: border-color .3s; }
.site-header.scrolled { border-color: var(--line); }
.header-row { display: flex; align-items: center; gap: 20px; height: 72px; }
.brand img { height: 56px; width: auto; }
.main-nav { flex: 1; }
.nav-list { list-style: none; display: flex; gap: 2px; margin: 0; padding: 0; justify-content: center; }
.nav-item { position: relative; flex-shrink: 0; }
.nav-trigger { background: none; border: 0; font: 500 .93rem var(--sans); color: var(--ink); padding: 10px 10px; border-radius: 8px; cursor: pointer; display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.nav-trigger:hover, .nav-trigger[aria-expanded="true"] { background: var(--paper-2); }
.nav-trigger.is-active { box-shadow: inset 0 -2px 0 var(--amber); }
.nav-trigger svg { transition: transform .2s; flex-shrink: 0; }
.nav-trigger[aria-expanded="true"] svg { transform: rotate(180deg); }
.dropdown { list-style: none; margin: 0; padding: 8px; position: absolute; top: calc(100% + 8px); left: 50%; min-width: 280px; background: var(--card); border: 1.5px solid var(--ink); border-radius: 12px; box-shadow: 5px 5px 0 var(--ink); opacity: 0; visibility: hidden; transform: translate(-50%, -6px); transition: opacity .18s, transform .18s var(--ease), visibility .18s; }
.nav-item.open .dropdown { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.dropdown a { display: block; padding: 9px 12px; border-radius: 8px; text-decoration: none; color: var(--ink); font-size: .93rem; }
.dropdown a:hover, .dropdown a:focus-visible { background: var(--indigo-soft); }
.dropdown a small { display: block; color: var(--slate); font-size: .78rem; margin-top: 2px; }
.dropdown .dd-lead { font-weight: 600; border-bottom: 1px dashed var(--line); border-radius: 8px 8px 0 0; margin-bottom: 4px; }
.header-tools { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.icon-btn { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; color: var(--ink); }
.icon-btn:hover { background: var(--paper-2); color: var(--ink); }
.lang-switch { display: flex; border: 1.5px solid var(--ink); border-radius: 8px; overflow: hidden; font: 600 .76rem var(--mono); }
.lang-switch a, .lang-switch span { padding: 6px 9px; text-decoration: none; color: var(--ink); }
.lang-on { background: var(--ink); color: var(--paper) !important; }
.lang-switch a:hover { background: var(--amber-soft); }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1.5px solid var(--ink); background: var(--card); border-radius: 10px; cursor: pointer; position: relative; }
.bars, .bars::before, .bars::after { position: absolute; left: 11px; width: 18px; height: 2px; background: var(--ink); content: ''; transition: transform .25s var(--ease), opacity .2s; }
.bars { top: 19px; } .bars::before { top: -6px; left: 0; } .bars::after { top: 6px; left: 0; }
.menu-toggle[aria-expanded="true"] .bars { background: transparent; }
.menu-toggle[aria-expanded="true"] .bars::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .bars::after { transform: translateY(-6px) rotate(-45deg); }
.nav-mobile-extra { display: none; }

@media (min-width: 1081px) {
  .site-header .header-row { width: 100%; max-width: 1360px; padding-inline: 24px; }
  .header-row > .brand { flex-shrink: 0; }
}
@media (min-width: 1081px) and (max-width: 1279px) {
  .site-header .header-row { gap: 10px; padding-inline: 16px; }
  .brand img { height: 48px; }
  .nav-trigger { font-size: .84rem; padding-inline: 4px; gap: 4px; }
  .header-tools { gap: 5px; }
  .header-tools .lms-nav-link { padding-inline: 6px; }
}
@media (max-width: 1080px) {
  .menu-toggle { display: block; }
  .hide-sm { display: none; }
  .header-row { justify-content: space-between; }
  .main-nav { position: fixed; inset: 72px 0 auto 0; height: calc(100dvh - 72px); background: var(--paper); padding: 20px; overflow-y: auto; transform: translateY(-8px); opacity: 0; pointer-events: none; transition: transform .3s var(--ease), opacity .3s; visibility: hidden; }
  .main-nav.open { transform: none; opacity: 1; pointer-events: auto; visibility: visible; }
  .nav-list { flex-direction: column; gap: 0; }
  .nav-item { border-bottom: 1px solid var(--line); }
  .nav-trigger { width: 100%; justify-content: space-between; padding: 16px 4px; font-size: 1.1rem; font-family: var(--serif); }
  .dropdown { position: static; transform: none; opacity: 1; visibility: visible; display: none; box-shadow: none; border: 0; background: transparent; min-width: 0; padding: 0 0 12px; }
  .nav-item.open .dropdown { display: block; transform: none; }
  .nav-mobile-extra { display: block; margin-top: 24px; }
  body.menu-open { overflow: hidden; }
}

/* sections */
.section { padding: clamp(72px, 10vw, 140px) 0; position: relative; }
.section-tight { padding: clamp(40px, 6vw, 72px) 0; }
.sec-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 44px; flex-wrap: wrap; }
.sec-head .lede { margin: 0; }
.two-col { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(32px, 6vw, 96px); align-items: start; }
.prose-lg { font-size: 1.15rem; }
.dropcap::first-letter { font-family: var(--serif); float: left; font-size: 4.2em; line-height: .82; padding: .06em .1em 0 0; color: var(--indigo); font-weight: 800; }

/* hero */
.hero { padding: clamp(40px, 7vw, 96px) 0 40px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero-title .hl-line { display: inline; }
.hero-art { margin: 0; position: relative; transform: rotate(1.2deg); }
.hero-art .sketch { width: 100%; height: auto; filter: drop-shadow(8px 10px 0 rgba(17,24,39,.9)); }
.hero-avatar { position: absolute; width: 104px; height: 104px; left: -34px; bottom: 30px; border-radius: 50%; background: var(--amber-soft); border: 1.5px solid var(--ink); transform: rotate(-6deg); object-fit: cover; }
.sketch .draw { stroke-dasharray: 400; stroke-dashoffset: 400; animation: draw 1.6s var(--ease) forwards .9s; }
.sketch .stage { opacity: 0; animation: fadeUp .7s var(--ease) forwards; }
.sketch .s1 { animation-delay: .2s; } .sketch .s2 { animation-delay: .7s; } .sketch .s3 { animation-delay: 1.2s; }
.sketch .caret { animation: blink 1.1s steps(2) infinite; opacity: .0; }
.marquee-row { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 56px; padding-top: 22px; border-top: 1px dashed var(--line); color: var(--slate); font-size: .82rem; }
.marquee-row span::before { content: '#'; color: var(--amber); margin-right: 3px; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes blink { 50% { opacity: 1; } }

/* reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); transition-delay: calc(var(--i, 0) * 80ms); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

/* topics shelf */
.topic-shelf { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); border-top: 1.5px solid var(--ink); }
.topic-spine { border-bottom: 1.5px solid var(--ink); border-right: 1px dashed var(--line); }
.topic-spine a { display: grid; gap: 10px; padding: 28px 26px 30px; text-decoration: none; color: var(--ink); height: 100%; transition: background .25s; position: relative; }
.topic-spine a:hover { background: var(--card); }
.topic-spine a::after { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--indigo); transform: scaleY(0); transform-origin: top; transition: transform .35s var(--ease); }
.topic-spine a:hover::after { transform: scaleY(1); }
.spine-num { color: var(--amber); font-size: 1.6rem; font-weight: 600; -webkit-text-stroke: 1px var(--ink); }
.spine-title { font-family: var(--serif); font-size: 1.55rem; font-weight: 600; line-height: 1.12; }
.spine-sum { color: var(--slate); font-size: .96rem; }
.spine-meta { font-size: .78rem; color: var(--indigo); margin-top: auto; }

/* method */
.method { background: var(--ink); color: var(--paper); }
.method .kicker { color: var(--amber); }
.method-track { list-style: none; padding: 0; margin: 56px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.method-track li { padding: 26px 24px 0 0; border-top: 2px solid rgba(250,247,240,.25); position: relative; }
.method-track li::before { content: ''; position: absolute; top: -7px; left: 0; width: 12px; height: 12px; border-radius: 50%; background: var(--amber); }
.method-track h3 { font-family: var(--serif); font-weight: 600; font-size: 1.35rem; margin: .5rem 0; }
.method-track p { color: rgba(250,247,240,.72); margin: 0; font-size: .96rem; }
.m-step { color: var(--amber); font-size: .78rem; }
.method-track.compact { grid-template-columns: repeat(3, 1fr); margin-top: 24px; }
.method-track.compact li { border-color: var(--line); }
.method-track.compact p { color: var(--slate); }
.method-track.compact .m-step { color: var(--indigo); }

/* demo */
.play-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.legend { list-style: none; padding: 0; display: grid; gap: 8px; margin-top: 24px; }
.lg { display: inline-block; width: 14px; height: 14px; border-radius: 3px; border: 1.5px solid var(--ink); vertical-align: -2px; margin-right: 6px; }
.lg-a { background: var(--indigo); } .lg-b { background: var(--indigo-soft); } .lg-c { background: var(--amber); }
.demo { background: var(--card); border: 1.5px solid var(--ink); border-radius: 14px; padding: 22px; box-shadow: 6px 6px 0 var(--ink); }
.demo-tabs { display: flex; gap: 6px; background: var(--paper-2); padding: 4px; border-radius: 10px; margin-bottom: 18px; }
.demo-tabs button { flex: 1; border: 0; background: transparent; padding: 9px; border-radius: 8px; font: 600 .86rem var(--sans); cursor: pointer; color: var(--slate); }
.demo-tabs button[aria-selected="true"] { background: var(--ink); color: var(--paper); }
.demo-target { margin-bottom: 16px; font-size: .9rem; }
.demo-target input { width: 70px; font: inherit; padding: 4px 8px; border: 1.5px solid var(--ink); border-radius: 6px; background: var(--paper); }
.demo-array { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.demo-cell { aspect-ratio: 1; display: grid; place-items: center; border: 1.5px solid var(--ink); border-radius: 8px; font: 600 1.1rem var(--mono); background: var(--paper); position: relative; transition: background .25s, transform .25s var(--ease), color .25s; }
.demo-cell small { position: absolute; bottom: -20px; font-size: .66rem; color: var(--slate); font-weight: 400; }
.demo-cell.is-i { background: var(--indigo); color: #fff; transform: translateY(-6px); }
.demo-cell.is-j { background: var(--indigo-soft); transform: translateY(-3px); }
.demo-cell.is-seen { background: var(--indigo-soft); }
.demo-cell.is-hit { background: var(--amber); color: var(--ink); transform: translateY(-6px) rotate(-3deg); }
.demo-map { margin-top: 34px; min-height: 40px; display: flex; flex-wrap: wrap; gap: 6px; font-size: .78rem; }
.demo-map span { padding: 4px 8px; border: 1px dashed var(--indigo); border-radius: 6px; color: var(--indigo); animation: fadeUp .3s var(--ease); }
.demo-log { min-height: 3em; font-size: .84rem; color: var(--ink-2); border-left: 3px solid var(--amber); padding-left: 10px; margin: 14px 0; }
.demo-controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.demo-count { margin-left: auto; font-size: .82rem; }

/* labs bench */
.lab-bench { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.lab-ticket { display: grid; gap: 8px; padding: 26px 26px 22px 44px; background: var(--card); border: 1.5px solid var(--ink); border-radius: 4px 14px 14px 4px; text-decoration: none; color: var(--ink); position: relative; transition: transform .25s var(--ease), box-shadow .25s; }
.lab-ticket::before { content: ''; position: absolute; left: 18px; top: 14px; bottom: 14px; border-left: 2px dashed var(--amber); }
.lab-ticket:nth-child(2n) { transform: rotate(.6deg); } .lab-ticket:nth-child(2n+1) { transform: rotate(-.5deg); }
.lab-ticket:hover { transform: translate(-2px, -3px) rotate(0); box-shadow: 6px 7px 0 var(--ink); color: var(--ink); }
.lab-ticket h3 { font-family: var(--serif); font-size: 1.4rem; margin: 0; line-height: 1.15; }
.lab-ticket p { margin: 0; color: var(--slate); font-size: .95rem; }
.ticket-no { font-size: .72rem; color: var(--indigo); }
.ticket-meta { font-size: .76rem; color: var(--slate); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.chip { font: 500 .72rem var(--mono); padding: 3px 8px; border-radius: 999px; background: var(--indigo-soft); color: var(--indigo-d); }

/* course */
.course-card { background: var(--ink); color: var(--paper); border-radius: 20px; padding: clamp(32px, 5vw, 64px); display: grid; grid-template-columns: 1.6fr 1fr; gap: 40px; align-items: center; position: relative; overflow: hidden; }
.course-card::after { content: ''; position: absolute; right: -80px; top: -80px; width: 260px; height: 260px; border: 2px dashed rgba(255,184,92,.4); border-radius: 50%; }
.course-card .lede { color: rgba(250,247,240,.8); }
.course-facts { margin: 0; display: grid; gap: 14px; }
.course-facts div { border-top: 1px solid rgba(250,247,240,.2); padding-top: 10px; }
.course-facts dt { font-size: .72rem; color: var(--amber); }
.course-facts dd { margin: 2px 0 0; font-size: 1rem; }

/* building */
.build-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; }
.timeline { list-style: none; padding: 0 0 0 26px; margin: 0; border-left: 2px solid var(--ink); }
.timeline li { margin-bottom: 26px; position: relative; }
.timeline li::before { content: ''; position: absolute; left: -34px; top: 8px; width: 14px; height: 14px; border-radius: 50%; background: var(--amber); border: 2px solid var(--ink); }
.timeline a { text-decoration: none; color: var(--ink); }
.timeline h3 { font-family: var(--serif); margin: 0 0 4px; font-size: 1.3rem; }
.timeline p { margin: 0; color: var(--slate); }
.empty-journal { border: 1.5px dashed var(--ink); border-radius: 14px; padding: 36px; background: var(--card); }
.empty-journal h3 { font-family: var(--serif); font-size: 1.4rem; margin: 18px 0 8px; }
.empty-journal p { color: var(--slate); margin: 0; max-width: 52ch; }
.shipped { background: var(--amber-soft); border: 1.5px solid var(--ink); border-radius: 14px; padding: 26px; transform: rotate(.8deg); }
.shipped ul { list-style: none; margin: 0 0 18px; padding: 0; }
.shipped li { border-bottom: 1px dashed rgba(17,24,39,.25); }
.shipped a { display: block; padding: 12px 0; text-decoration: none; color: var(--ink); }
.shipped strong { display: block; font-family: var(--serif); font-size: 1.15rem; }
.shipped a span { font-size: .88rem; color: var(--ink-2); }
.foot-h { font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; color: var(--slate); margin: 0 0 12px; font-weight: 600; }

/* teams */
.teams { background: var(--indigo-soft); }
.teams-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: clamp(32px, 6vw, 80px); align-items: center; }
.teams-diagram svg { width: 100%; height: auto; }
.inline-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }

/* founder */
.founder-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: clamp(32px, 6vw, 96px); align-items: center; }
.founder-portrait { margin: 0; }
.founder-portrait img, .about-portrait img { width: 100%; max-width: 360px; aspect-ratio: 1; object-fit: cover; border-radius: 50%; background: radial-gradient(circle at 40% 35%, var(--amber-soft), var(--indigo-soft)); border: 1.5px solid var(--ink); box-shadow: 8px 8px 0 var(--amber); }
.pull { font-family: var(--serif); font-style: italic; font-size: clamp(1.25rem, 2vw, 1.6rem); line-height: 1.35; margin: 0 0 1.3em; padding-left: 22px; border-left: 3px solid var(--amber); }

/* essays */
.essay-list { border-top: 1.5px solid var(--ink); }
.essay-row { display: grid; grid-template-columns: 140px 1fr; gap: 6px 32px; padding: 26px 0; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); transition: padding .3s var(--ease), background .3s; }
.essay-row:hover { padding-left: 14px; background: linear-gradient(90deg, var(--card), transparent); color: var(--ink); }
.essay-date { font-size: .78rem; color: var(--slate); padding-top: .5em; grid-row: span 2; }
.essay-title { font-family: var(--serif); font-size: clamp(1.3rem, 2.2vw, 1.75rem); font-weight: 600; line-height: 1.15; }
.essay-lead .essay-title { font-size: clamp(1.6rem, 3vw, 2.4rem); }
.essay-sum { color: var(--slate); }
.empty-note { border: 1.5px dashed var(--line); border-radius: 12px; padding: 28px; text-align: center; }

/* newsletter */
.newsletter { background: var(--ink); color: var(--paper); padding: clamp(64px, 8vw, 110px) 0; position: relative; overflow: hidden; }
.newsletter::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px); background-size: 28px 28px; }
.newsletter .kicker { color: var(--amber); }
.newsletter .lede { color: rgba(250,247,240,.78); }
.nl-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center; position: relative; }
.nl-form { display: grid; gap: 14px; }
.newsletter .field span, .newsletter .check { color: rgba(250,247,240,.85); }
.newsletter .field input { background: rgba(250,247,240,.06); color: var(--paper); border-color: rgba(250,247,240,.35); }
.newsletter .check a { color: var(--amber); }
.newsletter .btn-amber { box-shadow: 3px 3px 0 var(--paper); justify-self: start; }

/* forms */
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 20px; min-width: 0; }
.form-grid > * { min-width: 0; max-width: 100%; }
.span-2 { grid-column: span 2; }
.field { display: grid; gap: 6px; }
.field span { font-size: .86rem; font-weight: 600; }
.field input, .field select, .field textarea { font: inherit; font-size: 1rem; padding: 12px 14px; border: 1.5px solid var(--ink); border-radius: 10px; background: var(--card); color: var(--ink); width: 100%; transition: box-shadow .2s; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; box-shadow: 0 0 0 3px rgba(91,75,255,.3); border-color: var(--indigo); }
.field .invalid, .field [aria-invalid="true"] { border-color: #C2410C; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: .9rem; }
.check input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--indigo); flex-shrink: 0; }
.form-status { margin: 10px 0 0; font-size: .92rem; min-height: 1.4em; }
.form-status.ok { color: #0F7A4F; font-weight: 600; }
.form-status.err { color: #B42318; font-weight: 600; }
.newsletter .form-status.ok { color: #7FE3B4; } .newsletter .form-status.err { color: #FFB4A8; }
.form-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.paper-form { background: var(--card); border: 1.5px solid var(--ink); border-radius: 16px; padding: clamp(22px, 4vw, 40px); box-shadow: 6px 6px 0 var(--ink); }
.form-hero { display: grid; grid-template-columns: 1.6fr 1fr; gap: 40px; align-items: end; }
.note-card { background: var(--amber-soft); border: 1.5px solid var(--ink); padding: 28px; border-radius: 4px; transform: rotate(2deg); box-shadow: 4px 4px 0 var(--ink); }
.note-card .hand { font-size: 1.3rem; color: var(--ink); margin: 0; }

/* lists */
.list-hero, .page-hero { padding: clamp(40px, 6vw, 80px) 0 20px; }
.crumbs { color: var(--slate); margin-bottom: 18px; }
.crumbs a { color: var(--slate); }
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; align-items: center; }
.filter-search { flex: 1 1 300px; display: flex; align-items: center; gap: 10px; border: 1.5px solid var(--ink); border-radius: 10px; padding: 0 14px; background: var(--card); }
.filter-search input { border: 0; background: transparent; font: inherit; padding: 12px 0; width: 100%; outline: none; }
.filter-search:focus-within { box-shadow: 0 0 0 3px rgba(91,75,255,.3); }
.filter-sel select { font: inherit; font-size: .93rem; padding: 11px 12px; border: 1.5px solid var(--ink); border-radius: 10px; background: var(--card); }
.result-count { color: var(--slate); margin-top: 14px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 20px; }
.card { background: var(--card); border: 1.5px solid var(--ink); border-radius: 14px; transition: transform .25s var(--ease), box-shadow .25s; }
.card:hover { transform: translate(-2px, -2px); box-shadow: 5px 5px 0 var(--ink); }
.card-link { display: grid; gap: 10px; padding: 22px; text-decoration: none; color: var(--ink); height: 100%; grid-template-rows: auto auto 1fr auto; }
.card-top { display: flex; justify-content: space-between; align-items: center; }
.tag { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; padding: 3px 8px; border-radius: 5px; background: var(--paper-2); }
.card-lab .tag { background: var(--amber-soft); } .card-lesson .tag, .card-topic .tag { background: var(--indigo-soft); color: var(--indigo-d); }
.card-title { font-family: var(--serif); font-size: 1.32rem; line-height: 1.15; margin: 0; }
.card-sum { margin: 0; color: var(--slate); font-size: .94rem; }
.card-meta { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .74rem; color: var(--slate); align-items: center; }
.card-meta .arrow { margin-left: auto; color: var(--indigo); font-size: 1rem; transition: transform .2s; }
.card:hover .arrow { transform: translateX(4px); }
.diff { display: inline-flex; gap: 2px; vertical-align: middle; }
.diff i { width: 6px; height: 12px; border-radius: 2px; border: 1.2px solid var(--ink); }
.diff-beginner i:nth-child(1), .diff-intermediate i:nth-child(-n+2), .diff-advanced i { background: var(--indigo); }
.featured-entry { display: block; padding: clamp(26px, 4vw, 44px); margin-bottom: 36px; border: 1.5px solid var(--ink); border-radius: 18px; background: var(--card); text-decoration: none; color: var(--ink); box-shadow: 7px 7px 0 var(--amber); transition: transform .25s var(--ease); }
.featured-entry:hover { transform: translate(-2px, -2px); color: var(--ink); }
.group-h { font-size: .9rem; margin: 36px 0 16px; text-transform: uppercase; letter-spacing: .06em; }
.empty-state { text-align: center; padding: 48px 20px; display: grid; justify-items: center; gap: 6px; }
.empty-state svg { margin-bottom: 14px; }
.crosslink-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; border-top: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); padding: 32px 0; }
.crosslink-inner p { margin: 0; }

/* detail */
.detail-head { padding: clamp(36px, 6vw, 72px) 0 24px; }
.detail-title { max-width: 20ch; }
.meta-strip { display: flex; flex-wrap: wrap; gap: 6px 22px; color: var(--slate); margin-top: 20px; padding-top: 14px; border-top: 1px dashed var(--line); }
.cover { margin-top: 36px; }
.cover img { width: 100%; border-radius: 16px; border: 1.5px solid var(--ink); }
.detail-layout { display: grid; grid-template-columns: minmax(0, var(--read)); justify-content: center; gap: 56px; padding-bottom: 40px; }
.detail-layout.has-toc { grid-template-columns: 220px minmax(0, var(--read)); }
.toc { position: sticky; top: 100px; align-self: start; font-size: .88rem; }
.toc-h { color: var(--slate); margin-bottom: 10px; }
.toc ol { list-style: none; padding: 0; margin: 0; border-left: 1.5px solid var(--line); }
.toc a { display: block; padding: 5px 0 5px 14px; color: var(--slate); text-decoration: none; margin-left: -1.5px; border-left: 1.5px solid transparent; }
.toc a.active { color: var(--indigo); border-color: var(--indigo); }
.objectives { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; background: var(--card); border: 1.5px solid var(--ink); border-radius: 14px; padding: 24px; margin-bottom: 36px; }
.objectives h2 { margin: 0 0 10px; color: var(--indigo); }
.objectives ul { margin: 0; padding-left: 1.1em; }
.tick-list { list-style: none; padding: 0 !important; }
.tick-list li { padding-left: 26px; position: relative; margin-bottom: 6px; }
.tick-list li::before { content: ''; position: absolute; left: 0; top: .45em; width: 12px; height: 7px; border-left: 2px solid var(--indigo); border-bottom: 2px solid var(--indigo); transform: rotate(-45deg); }
.video { margin-bottom: 36px; aspect-ratio: 16/9; border-radius: 14px; overflow: hidden; border: 1.5px solid var(--ink); background: var(--ink); }
.video-play { width: 100%; height: 100%; border: 0; padding: 0; position: relative; cursor: pointer; background: var(--ink); }
.video-play img { width: 100%; height: 100%; object-fit: cover; opacity: .82; }
.play-dot { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 72px; height: 72px; border-radius: 50%; background: var(--amber); display: grid; place-items: center; color: var(--ink); border: 2px solid var(--ink); transition: transform .2s; }
.video-play:hover .play-dot { transform: translate(-50%, -50%) scale(1.08); }
.video iframe { width: 100%; height: 100%; border: 0; }
.lab-steps { list-style: none; padding: 0; margin: 0 0 32px; display: flex; flex-wrap: wrap; gap: 8px; }
.lab-steps li { display: flex; align-items: center; gap: 6px; padding: 5px 10px 5px 5px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); }
.lab-steps span { width: 20px; height: 20px; border-radius: 50%; background: var(--ink); color: var(--paper); display: grid; place-items: center; font-size: .7rem; }

/* prose */
.prose { font-size: 1.08rem; line-height: 1.75; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-family: var(--serif); font-size: clamp(1.55rem, 2.6vw, 2rem); line-height: 1.15; letter-spacing: -.02em; margin-top: 2.2em; scroll-margin-top: 96px; }
.prose h2::before { content: '§ '; color: var(--amber); }
.prose h3 { font-size: 1.25rem; margin-top: 1.8em; scroll-margin-top: 96px; }
.prose p, .prose li { color: var(--ink-2); }
.prose blockquote { margin: 1.8em 0; padding: 4px 0 4px 24px; border-left: 3px solid var(--amber); font-family: var(--serif); font-style: italic; font-size: 1.25rem; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--indigo-soft); color: var(--indigo-d); padding: .1em .35em; border-radius: 4px; }
.prose pre, .solution pre { position: relative; background: var(--ink); color: #EDE9DD; border-radius: 12px; padding: 22px 20px; overflow-x: auto; font-size: .88rem; line-height: 1.65; border: 1.5px solid var(--ink); box-shadow: 5px 5px 0 var(--amber); }
.prose pre code, .solution pre code { background: none; color: inherit; padding: 0; font-family: var(--mono); }
.copy-btn { position: absolute; top: 10px; right: 10px; font: 600 .7rem var(--mono); background: rgba(250,247,240,.1); color: var(--paper); border: 1px solid rgba(250,247,240,.25); border-radius: 6px; padding: 5px 9px; cursor: pointer; }
.copy-btn:hover { background: var(--amber); color: var(--ink); }
.prose figure { margin: 2em 0; }
.prose figcaption { font-family: var(--mono); font-size: .76rem; color: var(--slate); margin-top: 8px; }
.prose img { border-radius: 10px; border: 1px solid var(--line); }
.prose table { width: 100%; border-collapse: collapse; font-size: .95rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.prose th { background: var(--paper-2); font-weight: 600; }
.prose hr { border: 0; border-top: 1.5px dashed var(--line); margin: 3em 0; }
.tok-k { color: #A5A0FF; } .tok-s { color: #FFC98A; } .tok-c { color: #8A93A6; font-style: italic; } .tok-n { color: #7FE3B4; }

.pause-box { margin: 44px 0 20px; padding: 26px; background: var(--amber-soft); border: 1.5px solid var(--ink); border-radius: 14px; transform: rotate(-.4deg); }
.pause-box p { margin: 0; }
.hints { display: grid; gap: 10px; margin: 20px 0; }
.hint, .solution, .transcript { border: 1.5px solid var(--ink); border-radius: 12px; background: var(--card); }
.hint summary, .solution summary, .transcript summary { cursor: pointer; padding: 16px 18px; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 12px; }
.hint summary::-webkit-details-marker, .solution summary::-webkit-details-marker, .transcript summary::-webkit-details-marker { display: none; }
.hint summary .mono, .solution summary .mono { font-size: .72rem; padding: 3px 8px; border-radius: 5px; background: var(--indigo-soft); color: var(--indigo-d); }
.hint[data-locked] { opacity: .5; pointer-events: none; }
.hint[data-locked] summary::after { content: '\2014  open the previous hint first'; font: 400 .78rem var(--mono); color: var(--slate); }
.hint-body, .solution-body, .transcript-body { padding: 0 18px 18px; animation: fadeUp .35s var(--ease); }
.solution { background: var(--ink); color: var(--paper); margin-top: 18px; }
.solution summary .mono { background: var(--amber); color: var(--ink); }
.solution pre { box-shadow: none; border-color: rgba(250,247,240,.2); }
.transcript { margin-top: 28px; } .transcript-body { white-space: pre-wrap; color: var(--slate); }
.tab-list { display: flex; gap: 4px; margin-bottom: 10px; flex-wrap: wrap; }
.tab-list button { font: 600 .8rem var(--mono); border: 1px solid rgba(250,247,240,.3); background: transparent; color: var(--paper); padding: 6px 12px; border-radius: 6px; cursor: pointer; }
.tab-list button[aria-selected="true"] { background: var(--amber); color: var(--ink); border-color: var(--amber); }
.resources { display: flex; gap: 10px; margin-top: 28px; flex-wrap: wrap; }
.syllabus { margin-top: 48px; }
.syllabus-list { list-style: none; padding: 0; margin: 16px 0 0; border-top: 1.5px solid var(--ink); }
.syllabus-list a { display: grid; grid-template-columns: 44px 1fr auto; gap: 12px; align-items: baseline; padding: 16px 4px; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); transition: background .2s, padding .2s; }
.syllabus-list a:hover { background: var(--card); padding-left: 12px; }
.syl-n { color: var(--indigo); } .syl-t { font-family: var(--serif); font-size: 1.15rem; }
.waitlist { margin-top: 48px; padding: clamp(22px, 4vw, 36px); border: 1.5px solid var(--ink); border-radius: 16px; background: var(--card); box-shadow: 6px 6px 0 var(--indigo); }
.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; }
.prevnext a { display: grid; gap: 4px; padding: 18px; border: 1.5px solid var(--ink); border-radius: 12px; text-decoration: none; color: var(--ink); background: var(--card); }
.prevnext a:hover { box-shadow: 4px 4px 0 var(--ink); }
.pn-next { text-align: right; }
.share { display: flex; gap: 16px; align-items: center; margin-top: 44px; padding-top: 18px; border-top: 1px dashed var(--line); flex-wrap: wrap; }
.author-card { display: flex; gap: 16px; align-items: center; margin-top: 24px; padding: 18px; border-radius: 14px; background: var(--indigo-soft); }
.author-card img { border-radius: 50%; border: 1.5px solid var(--ink); background: var(--amber-soft); }
.author-card p { margin: 2px 0 0; }
.related { border-top: 1.5px solid var(--ink); background: var(--paper-2); }

/* about */
.about-hero { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; }
.about-portrait { margin: 0; justify-self: center; }
.about-cta { margin-top: 48px; }

/* error */
.error-grid { display: grid; grid-template-columns: auto 1fr; gap: 56px; align-items: center; }

/* footer */
.site-footer { background: var(--paper-2); border-top: 1.5px solid var(--ink); padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer-logo { height: 44px; width: auto; margin-bottom: 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.site-footer a { color: var(--ink); text-decoration: none; }
.site-footer a:hover { color: var(--indigo); text-decoration: underline; }
.footer-base { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-top: 48px; padding-top: 20px; border-top: 1px dashed var(--line); }
.footer-base .legal { display: flex; gap: 18px; flex-wrap: wrap; }

/* responsive */
@media (max-width: 960px) {
  .hero-grid, .two-col, .play-grid, .build-grid, .teams-grid, .founder-grid, .nl-grid, .course-card, .about-hero, .form-hero, .error-grid { grid-template-columns: 1fr; }
  .method-track { grid-template-columns: 1fr 1fr; row-gap: 36px; }
  .detail-layout.has-toc { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-avatar { left: auto; right: -6px; bottom: -24px; width: 84px; height: 84px; }
  .founder-portrait img { max-width: 260px; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .lab-bench, .method-track, .method-track.compact, .form-grid, .prevnext { grid-template-columns: minmax(0, 1fr); }
  .span-2 { grid-column: auto; }
  .essay-row { grid-template-columns: 1fr; }
  .essay-date { grid-row: auto; padding: 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .demo-array { gap: 5px; } .demo-cell { font-size: .9rem; }
  .brand img { height: 40px; }
  .header-tools { gap: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-delay: 0ms !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .sketch .stage { opacity: 1; } .sketch .draw { stroke-dashoffset: 0; }
}
@media print { .site-header, .newsletter, .site-footer, .progress { display: none; } body { background: #fff; } }
.course-sheet { margin: 40px 0 24px; padding: 22px 24px; border: 1.5px solid var(--ink); border-radius: 14px; background: var(--amber-soft); }
.course-sheet dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin: 0 0 12px; }
.course-sheet dt { font-size: .72rem; color: var(--slate); }
.course-sheet dd { margin: 2px 0 0; font-weight: 600; font-size: 1.05rem; }
.status-pill { display: inline-block; font-size: .8rem; padding: 3px 10px; border-radius: 999px; background: var(--ink); color: var(--paper); }
.paper-form + .empty-state, .course-sheet + .paper-form { margin-top: 0; }

/* Paid enrolment */
.status-pill.is-open { background: #DDF5E9; color: #0F5C3D; border-color: #0F7A4F; }
.region-pick { border: 0; padding: 0; margin: 0; min-inline-size: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.region-pick legend { margin-bottom: 10px; }
.region-opt { display: flex; gap: 12px; align-items: flex-start; border: 1.5px solid var(--ink); border-radius: 12px; padding: 14px 16px; cursor: pointer; background: var(--card); transition: transform .15s ease, box-shadow .15s ease; }
.region-opt:has(input:checked) { box-shadow: 4px 4px 0 var(--indigo); transform: translate(-2px, -2px); }
.region-opt input { accent-color: var(--indigo); width: 18px; height: 18px; margin-top: 4px; flex-shrink: 0; }
.region-body { display: grid; gap: 4px; min-width: 0; overflow-wrap: anywhere; }
.region-name { font-weight: 600; }
.region-price { font-size: 1.35rem; font-weight: 600; }
@media (max-width: 767px) { .region-pick { grid-template-columns: 1fr; } }
.notice { display: grid; gap: 4px; border: 1.5px solid var(--ink); border-radius: 12px; padding: 14px 18px; margin-bottom: 22px; }
.notice-warn { background: #FFF1DB; }
.card-enrol { display: inline-block; margin: 0 20px 16px; color: var(--indigo); font-weight: 600; text-decoration: none; }
.card-enrol:hover { text-decoration: underline; }
.order-state { display: grid; gap: 10px; }
.order-tag { display: inline-flex; align-items: center; gap: 6px; text-transform: uppercase; letter-spacing: .08em; }
.order-state[data-state="paid"] .order-tag { color: #0F7A4F; }
.order-state[data-state="failed"] .order-tag, .order-state[data-state="error"] .order-tag, .order-state[data-state="invalid"] .order-tag { color: #B42318; }
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--indigo); animation: cc-pulse 1.2s ease-in-out infinite; }
@keyframes cc-pulse { 50% { opacity: .25; transform: scale(.7); } }
@media (prefers-reduced-motion: reduce) { .pulse-dot { animation: none; } }
.order-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0 0; }
.order-facts dd { margin: 2px 0 0; font-weight: 600; }
.order-foot { margin-top: 18px; }