/* Layout: one scrolling page in a light, Slack-like look. White sections, aubergine bands for the hero and the build story, sticky section nav. */
:root {
  --bg: #FFFFFF;
  --bg-soft: #F8F5F1;
  --ink: #1D1C1D;
  --muted: #545454;
  --line: #E8E3EA;
  --aubergine: #4A154B;
  --aubergine-deep: #3B0F3D;
  --on-aubergine: #FFFFFF;
  --on-aubergine-muted: #E3D2E4;
  --link: #1264A3;
  --green: #007A5A;
  --green-soft: #E3F4EE;
  --yellow: #ECB22E;
  --yellow-soft: #FDF3DB;
  --blue: #36C5F0;
  --red: #E01E5A;
  --shadow: 0 1px 3px rgba(29,28,29,.08), 0 16px 40px rgba(74,21,75,.12);
  --font-display: "Lato", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-body: "Lato", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.1; text-wrap: balance; margin: 0; }
p { margin: 0; }
a { color: var(--link); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }

.wrap {
  max-width: 1160px; margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

/* Sticky nav */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--aubergine); }
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5;
  background: var(--aubergine); color: var(--on-aubergine);
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { color: var(--on-aubergine); font-weight: 900; font-size: 1.2rem; text-decoration: none; letter-spacing: -.01em; white-space: nowrap; display: flex; align-items: center; gap: 10px; }
.mark { display: grid; grid-template-columns: 8px 8px; gap: 3px; }
.mark i { width: 8px; height: 8px; border-radius: 2px; display: block; }
.nav ul { list-style: none; display: flex; gap: 4px; margin: 0 0 0 auto; padding: 0; overflow-x: auto; scrollbar-width: none; }
.nav ul::-webkit-scrollbar { display: none; }
.nav a.link {
  display: block; padding: 8px 12px; border-radius: 6px; text-decoration: none;
  font-size: .92rem; font-weight: 700; color: var(--on-aubergine-muted); white-space: nowrap;
}
.nav a.link:hover { color: var(--on-aubergine); background: rgba(255,255,255,.1); }
.nav a.link[aria-current="true"] { color: var(--aubergine); background: var(--on-aubergine); }

/* Hero */
.hero-band { background: var(--aubergine); color: var(--on-aubergine); }
.hero { padding-block: 80px 88px; display: grid; gap: 28px; }
.eyebrow { font-size: .8rem; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; color: var(--aubergine); }
.hero .eyebrow { color: var(--yellow); }
.hero h1 { font-size: clamp(2.7rem, 7vw, 5rem); font-weight: 900; letter-spacing: -.02em; }
.hero .lede { font-size: clamp(1.1rem, 2.2vw, 1.4rem); color: var(--on-aubergine-muted); max-width: 42rem; }

.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 8px; }
.chip { font-weight: 700; font-size: .92rem; line-height: 1; padding: 12px 16px; border-radius: 6px; background: rgba(255,255,255,.1); color: var(--on-aubergine); }
.chip.good { background: var(--green); }
.chip.warn { background: var(--yellow); color: var(--ink); }
.arrow { color: var(--on-aubergine-muted); font-weight: 700; }

/* Sections */
section.block { padding-block: 88px; }
section.soft { background: var(--bg-soft); }
.head { display: grid; gap: 14px; max-width: 46rem; margin-bottom: 44px; }
.head h2 { font-size: clamp(2rem, 4.4vw, 3rem); font-weight: 900; letter-spacing: -.02em; }
.head p { color: var(--muted); font-size: 1.15rem; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 56px; align-items: center; }
@media (max-width: 820px) { .split { grid-template-columns: minmax(0, 1fr); gap: 32px; } }

.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; font-size: 1.08rem; }
.ticks li { display: grid; grid-template-columns: 24px minmax(0,1fr); gap: 10px; }
.ticks li::before { content: "✓"; color: var(--green); font-weight: 900; }

.callout {
  display: flex; gap: 14px; align-items: start; margin-bottom: 44px; max-width: 46rem;
  background: var(--yellow-soft); border-radius: 8px; padding: 16px 18px; color: var(--ink);
}
.callout b { white-space: nowrap; }

/* Steps (a real sequence) */
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 48px; counter-reset: step; }
.step { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 48px; align-items: start; counter-increment: step; }
@media (max-width: 820px) { .step { grid-template-columns: minmax(0, 1fr); gap: 18px; } }
.step-text { display: grid; gap: 10px; min-width: 0; }
.step-text h3 { font-size: 1.5rem; font-weight: 900; letter-spacing: -.01em; display: flex; align-items: center; gap: 12px; }
.step-text h3::before {
  content: counter(step); flex: none; display: grid; place-items: center; width: 32px; height: 32px;
  border-radius: 8px; background: var(--aubergine); color: var(--on-aubergine); font-size: .95rem; font-weight: 900;
}
.step-text p { color: var(--muted); }
.quote {
  font-size: 1.05rem; line-height: 1.55; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-left: 4px solid var(--aubergine); border-radius: 8px; padding: 14px 16px;
}
section.block:not(.soft) .quote { background: var(--bg-soft); }

.shot {
  margin: 0; background: var(--bg); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); overflow: hidden; cursor: zoom-in; padding: 0;
  display: block; width: 100%; color: inherit; font: inherit;
}
.shot img { width: 100%; height: auto; }
.shot.narrow { max-width: 420px; }
.shot.mid { max-width: 560px; }

.done {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 48px;
  background: var(--green-soft); border-radius: 12px; padding: 22px 26px;
}
.done strong { color: var(--green); font-size: 1.7rem; font-weight: 900; }
.done span { color: var(--ink); font-size: 1.1rem; }

/* More: category cards */
.cats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; align-items: start; }
@media (max-width: 720px) { .cats { grid-template-columns: minmax(0, 1fr); } }
.cat { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 22px; display: grid; gap: 12px; min-width: 0; }
.cat h3 { font-size: 1.12rem; font-weight: 900; color: var(--aubergine); }
.cat ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.cat li { position: relative; padding-left: 18px; font-size: .98rem; line-height: 1.45; }
.cat li::before { content: ""; position: absolute; left: 2px; top: .58em; width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.cat details ul { margin-top: 10px; }
.cat summary { cursor: pointer; font-weight: 700; color: var(--link); font-size: .95rem; list-style: none; }
.cat summary::-webkit-details-marker { display: none; }
.cat summary::after { content: " ↓"; }
.cat details[open] summary::after { content: " ↑"; }
.cat code { font-family: var(--font-mono); font-size: .88em; background: var(--bg-soft); padding: 1px 5px; border-radius: 4px; }

/* Built */
.dark { background: var(--aubergine-deep); color: var(--on-aubergine); }
.dark .head p { color: var(--on-aubergine-muted); }
.dark .eyebrow { color: var(--yellow); }
.stack { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 64px; }
@media (max-width: 900px) { .stack { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .stack { grid-template-columns: minmax(0, 1fr); } }
.piece { border: 1px solid rgba(255,255,255,.18); border-radius: 10px; padding: 22px; display: grid; gap: 8px; align-content: start; }
.piece .tag { font: 500 .72rem/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--on-aubergine-muted); }
.piece h3 { font-size: 1.15rem; font-weight: 900; }
.piece p { color: var(--on-aubergine-muted); font-size: .97rem; }
.piece.new { background: var(--bg); color: var(--ink); border-color: transparent; }
.piece.new .tag { color: var(--green); }
.piece.new p { color: var(--muted); }

.solve { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; padding-block: 24px; border-top: 1px solid rgba(255,255,255,.16); }
.solve:last-child { border-bottom: 1px solid rgba(255,255,255,.16); }
@media (max-width: 720px) { .solve { grid-template-columns: minmax(0, 1fr); gap: 10px; } }
.solve .k { font: 500 .72rem/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--on-aubergine-muted); margin-bottom: 8px; display: block; }
.solve .k.fix { color: var(--yellow); }
.solve p { font-size: 1.05rem; }

/* Impact */
.impact { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 820px) { .impact { grid-template-columns: minmax(0, 1fr); } }
.impact div { background: var(--bg); border: 1px solid var(--line); border-top: 4px solid var(--c); border-radius: 10px; padding: 24px; display: grid; gap: 8px; align-content: start; }
.impact h3 { font-size: 1.35rem; font-weight: 900; }
.impact p { color: var(--muted); }
.closing { margin-top: 64px; display: grid; gap: 12px; max-width: 44rem; }
.closing h2 { font-size: clamp(1.9rem, 4vw, 2.7rem); font-weight: 900; letter-spacing: -.02em; color: var(--aubergine); }
.closing p { color: var(--muted); font-size: 1.15rem; }

footer { background: var(--aubergine); color: var(--on-aubergine-muted); }
footer .wrap { padding-block: 32px; font-size: .95rem; }
footer a { color: var(--on-aubergine); font-weight: 700; }

/* Lightbox */
dialog.zoom { border: 0; padding: 0; background: transparent; max-width: min(1100px, 94vw); max-height: 92vh; }
dialog.zoom::backdrop { background: rgba(29,12,30,.8); }
dialog.zoom img { max-height: 86vh; width: auto; margin: 0 auto; border-radius: 12px; }
dialog.zoom button {
  display: block; margin: 12px auto 0; font: 700 .95rem/1 var(--font-body); padding: 12px 18px;
  border-radius: 6px; border: 0; background: var(--bg); color: var(--aubergine); cursor: pointer;
}

/* Link to the build page */
.cta {
  display: inline-flex; align-items: center; gap: 10px; text-decoration: none;
  background: var(--bg); color: var(--aubergine); font-weight: 900; font-size: 1.05rem;
  padding: 14px 22px; border-radius: 8px;
}
.cta:hover { background: var(--yellow-soft); }

/* Build page */
.back { display: block; padding: 8px 12px; color: var(--on-aubergine-muted); text-decoration: none; font-weight: 700; font-size: .92rem; white-space: nowrap; }
.back:hover { color: var(--on-aubergine); }
.hero.small { padding-block: 64px 72px; }
.hero.small h1 { font-size: clamp(2.4rem, 6vw, 4rem); }

.placeholder {
  border: 2px dashed #C9B8CC; border-radius: 12px; background: var(--bg-soft);
  padding: 40px 24px; display: grid; gap: 10px; place-items: center; text-align: center; color: var(--muted);
  min-height: 280px; align-content: center;
}
.placeholder strong { color: var(--aubergine); font-size: 1.1rem; }
.badge {
  display: inline-block; font: 500 .72rem/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase;
  background: var(--yellow-soft); color: #7A5600; padding: 6px 8px; border-radius: 4px;
}

.arch { display: grid; gap: 14px; overflow-x: auto; }
.arch-row { display: flex; flex-wrap: wrap; align-items: stretch; gap: 10px; }
.node {
  flex: 1 1 180px; min-width: 0; border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px;
  background: var(--bg); display: grid; gap: 6px; align-content: start;
}
.node.new { border: 2px solid var(--green); }
.node .tag { font: 500 .7rem/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.node.new .tag { color: var(--green); }
.node h3 { font-size: 1.05rem; font-weight: 900; }
.node p { font-size: .92rem; color: var(--muted); line-height: 1.45; }
.link-arrow { align-self: center; color: var(--aubergine); font-weight: 900; font-size: 1.3rem; }
@media (max-width: 720px) { .link-arrow { transform: rotate(90deg); width: 100%; text-align: center; } }
.arch-return { font-size: .95rem; color: var(--muted); padding-left: 4px; }
.arch-return b { color: var(--ink); }

.notes { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; counter-reset: note; }
.notes li { counter-increment: note; display: grid; grid-template-columns: 30px minmax(0,1fr); gap: 12px; }
.notes li::before {
  content: counter(note); display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--yellow); color: var(--ink); font-weight: 900; font-size: .85rem;
}
.notes b { display: block; }
.notes span { color: var(--muted); }

.rules { display: grid; gap: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--bg); }
.rule { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); border-top: 1px solid var(--line); }
.rule:first-child { border-top: 0; }
@media (max-width: 720px) { .rule { grid-template-columns: minmax(0, 1fr); } }
.rule pre {
  margin: 0; padding: 18px 20px; background: #1D1C1D; color: #F2EEF3; font: 500 .88rem/1.55 var(--font-mono);
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.rule div { padding: 18px 20px; display: grid; gap: 4px; align-content: start; }
.rule .k { font: 500 .7rem/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--green); }
.rule p { color: var(--muted); }

/* Attempt budget */
.budget { display: grid; gap: 0; margin-bottom: 32px; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--bg-soft); }
.budget h3 { font-size: 1.1rem; font-weight: 900; padding: 18px 20px 12px; }
.budget-row { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 16px; align-items: center; padding: 14px 20px; border-top: 1px solid var(--line); }
@media (max-width: 600px) { .budget-row { grid-template-columns: minmax(0, 1fr); gap: 8px; } }
.budget-row p { color: var(--muted); }
.pill { justify-self: start; font-weight: 900; font-size: .9rem; padding: 6px 12px; border-radius: 999px; background: var(--green-soft); color: var(--green); }
.pill.hot { background: #FCE4EC; color: #A3123F; }
.pill.warm { background: var(--yellow-soft); color: #7A5600; }