/* rivethub.io home. Standalone: subpages keep style.css + landing.css. */
@font-face { font-family: "DM Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("fonts/dm-sans-400.woff2") format("woff2"); }
@font-face { font-family: "DM Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("fonts/dm-sans-500.woff2") format("woff2"); }
@font-face { font-family: "DM Sans"; font-style: normal; font-weight: 700; font-display: swap; src: url("fonts/dm-sans-700.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("fonts/jetbrains-mono-400.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 700; font-display: swap; src: url("fonts/jetbrains-mono-700.woff2") format("woff2"); }

/* Light palette: bare :root. Dark swaps tokens only. */
:root {
  --paper: #f4f3eb;
  --paper-2: #ebeae0;
  --surface: #fcfcf6;
  --ink: #16221c;
  --soft: #4c5d54;
  --faint: #7d8b83;
  --rule: #d3dacf;
  --green: #00765a;
  --green-hi: #005e47;
  --green-wash: #dcebe1;
  --on-green: #ffffff;
  --brass: #946c24;
  --brass-wash: #f0e5cc;
  --sky: #266b93;
  --sky-wash: #dde9ef;
  --term-bg: #16221c;
  --term-ink: #e6ece2;
  --term-dim: #8ea298;
  --shadow: 0 1px 0 rgba(22, 34, 28, .04), 0 18px 40px -24px rgba(22, 34, 28, .28);
  --font-ui: "DM Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --spine-x: 22px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0d1712; --paper-2: #111e17; --surface: #14221b;
    --ink: #edf0e6; --soft: #a7b8ad; --faint: #6f8176; --rule: #25362c;
    --green: #8bd6af; --green-hi: #a9e6c5; --green-wash: #183126; --on-green: #0b1a12;
    --brass: #d9b36b; --brass-wash: #2c2616; --sky: #8cc8ea; --sky-wash: #152734;
    --term-bg: #08110c; --term-ink: #e6ece2; --term-dim: #7f9388;
    --shadow: 0 1px 0 rgba(0, 0, 0, .2), 0 24px 50px -26px rgba(0, 0, 0, .7);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0d1712; --paper-2: #111e17; --surface: #14221b;
  --ink: #edf0e6; --soft: #a7b8ad; --faint: #6f8176; --rule: #25362c;
  --green: #8bd6af; --green-hi: #a9e6c5; --green-wash: #183126; --on-green: #0b1a12;
  --brass: #d9b36b; --brass-wash: #2c2616; --sky: #8cc8ea; --sky-wash: #152734;
  --term-bg: #08110c; --term-ink: #e6ece2; --term-dim: #7f9388;
  --shadow: 0 1px 0 rgba(0, 0, 0, .2), 0 24px 50px -26px rgba(0, 0, 0, .7);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body.home {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--font-ui);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--green); text-underline-offset: 3px; }
a:hover { color: var(--green-hi); }
code { font-family: var(--font-mono); font-size: .86em; background: var(--paper-2); padding: .08em .35em; border-radius: 4px; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { margin: 0; text-wrap: balance; letter-spacing: -.025em; line-height: 1.05; }
p { margin: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--gutter); }

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 14px; z-index: 50; }
.skip-link:focus { left: 16px; }

/* Shared type */
.kicker, .chapter-no, .step-tag, .path-tag, .prompt-label, .route-where, .silo-name, .term-bar {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
}
.kicker { color: var(--soft); display: flex; align-items: center; gap: 10px; }
.text-link { font-weight: 500; text-decoration: none; }
.text-link:hover { text-decoration: underline; }

/* Buttons */
.cta-row { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  font-weight: 500; font-size: 16px; text-decoration: none;
  color: var(--ink); border: 1px solid var(--rule); background: var(--surface);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.btn:hover { color: var(--ink); border-color: var(--soft); transform: translateY(-1px); }
.btn-primary { background: var(--green); border-color: var(--green); color: var(--on-green); }
.btn-primary:hover { background: var(--green-hi); border-color: var(--green-hi); color: var(--on-green); }
.btn-cloud { border-color: var(--sky); color: var(--sky); background: transparent; }
.btn-cloud:hover { background: var(--sky-wash); color: var(--sky); border-color: var(--sky); }

/* Header */
.top {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.top-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; }
.wordmark { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: -.03em; }
.wordmark span { color: var(--green); }
.wordmark:hover { color: var(--ink); }
.robot { width: 24px; height: auto; image-rendering: pixelated; }
.top-nav { display: flex; align-items: center; gap: 22px; font-size: 15px; }
.top-nav a { color: var(--soft); text-decoration: none; }
.top-nav a:hover { color: var(--ink); }
.top-nav .top-cta { color: var(--on-green); background: var(--green); padding: 7px 14px; border-radius: 999px; font-weight: 500; }
.top-nav .top-cta:hover { color: var(--on-green); background: var(--green-hi); }
.progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; }
.progress i { display: block; height: 100%; width: 100%; background: var(--green); transform-origin: left; transform: scaleX(var(--p, 0)); }
@media (max-width: 860px) {
  .top-nav a:not(.top-cta) { display: none; }
}

/* ───── Hero ───── */
.hero { padding-block: clamp(40px, 7vw, 88px) 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.live { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px var(--green-wash); animation: pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 7px transparent; } }
.hero h1 {
  margin-top: 20px;
  font-size: clamp(2.6rem, 5.4vw, 5.1rem);
  font-weight: 700; letter-spacing: -.045em; line-height: .96;
}
.hero h1 span, .hero h1 em { display: block; white-space: nowrap; }
.hero h1 span:nth-child(2) { color: var(--soft); }
.hero h1 em { font-style: normal; color: var(--green); }
.lede { margin-top: 24px; max-width: 56ch; font-size: clamp(17px, 1.6vw, 19px); color: var(--soft); }
.hero .cta-row { margin-top: 30px; }
.prompt-line { margin-top: 28px; display: grid; gap: 8px; max-width: 560px; }
.prompt-label { color: var(--faint); }

.hero-viz { margin: 0; position: relative; }
.hero-viz canvas {
  display: block; width: 100%; height: auto; aspect-ratio: 640 / 560; max-width: 100%;
  border-radius: 20px; background: var(--surface); border: 1px solid var(--rule); box-shadow: var(--shadow);
}
.viz-readout {
  position: absolute; left: 16px; top: 14px; display: flex; flex-wrap: wrap; gap: 6px 16px;
  font: 12px/1.4 var(--font-mono); color: var(--soft); font-variant-numeric: tabular-nums;
}
.viz-readout b { color: var(--ink); font-weight: 700; }
.hero-viz figcaption { margin-top: 12px; font-size: 14px; color: var(--faint); max-width: 60ch; }

.trio { margin-top: clamp(48px, 7vw, 80px); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--rule); }
.trio a { display: grid; gap: 4px; padding: 22px 20px 26px 0; text-decoration: none; color: var(--ink); border-right: 1px solid var(--rule); }
.trio a + a { padding-left: 24px; }
.trio a:last-child { border-right: 0; }
.trio a:hover .trio-name { color: var(--green); }
.trio a:last-child:hover .trio-name { color: var(--sky); }
.trio-name { font-weight: 700; font-size: 22px; letter-spacing: -.03em; transition: color .15s; }
.trio-role { color: var(--soft); font-size: 15px; }

/* ───── Problem ───── */
.problem { background: var(--paper-2); border-block: 1px solid var(--rule); padding-block: clamp(64px, 9vw, 120px); }
.problem-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 80px); align-items: start; }
.problem h2 { margin-top: 14px; font-size: clamp(2.2rem, 4.6vw, 3.6rem); font-weight: 700; }
.problem-copy p:not(.kicker) { margin-top: 18px; color: var(--soft); max-width: 60ch; }
.problem-copy .text-link { display: inline-block; margin-top: 22px; }
.silos { display: grid; gap: 10px; }
.silo {
  display: grid; grid-template-columns: 116px minmax(0, 1fr); gap: 14px; align-items: baseline;
  padding: 14px 18px; background: var(--surface); border: 1px solid var(--rule); border-radius: 12px;
  transition: transform .5s cubic-bezier(.2, .7, .2, 1);
}
.silo-name { color: var(--faint); font-size: 11px; }
.silo-line { font-family: var(--font-mono); font-size: 14px; color: var(--soft); }
.silo:nth-child(odd) { transform: translateX(-10px); }
.silo:nth-child(even) { transform: translateX(10px); }
.silos.is-joined .silo { transform: none; }
.silos-note { margin-top: 10px; font-size: 18px; color: var(--soft); }
.silos-note strong { color: var(--ink); }

/* ───── Story + spine ───── */
.story { position: relative; }
.spine {
  position: absolute; top: 0; bottom: 0;
  left: max(calc((100% - var(--wrap)) / 2 + var(--gutter) + var(--spine-x)), calc(var(--gutter) + var(--spine-x)));
  width: 2px; background: var(--rule);
}
.spine i { position: absolute; inset: 0 0 auto 0; height: 100%; background: linear-gradient(var(--green), var(--brass) 70%, var(--sky)); transform-origin: top; transform: scaleY(var(--fill, 0)); }
.chapter { padding-block: clamp(72px, 10vw, 132px) 0; }
.chapter > .wrap { padding-left: calc(var(--gutter) + var(--spine-x) + clamp(34px, 5vw, 64px)); }
.chapter-head { position: relative; max-width: 780px; }
.stud {
  position: absolute; top: 2px;
  left: calc(-1 * clamp(34px, 5vw, 64px) - 8px);
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--paper); border: 2px solid var(--rule);
  transition: background .4s, border-color .4s, box-shadow .4s;
}
.chapter.is-lit .stud { background: var(--green); border-color: var(--green); box-shadow: 0 0 0 6px var(--green-wash); }
.chapter-cloud.is-lit .stud { background: var(--sky); border-color: var(--sky); box-shadow: 0 0 0 6px var(--sky-wash); }
.chapter-grow.is-lit .stud { background: var(--brass); border-color: var(--brass); box-shadow: 0 0 0 6px var(--brass-wash); }
.chapter-no { color: var(--green); }
.chapter-cloud .chapter-no { color: var(--sky); }
.chapter-grow .chapter-no { color: var(--brass); }
.chapter-head h2 { margin-top: 12px; font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 700; letter-spacing: -.04em; }
.chapter-lede { margin-top: 20px; font-size: clamp(17px, 1.5vw, 19px); color: var(--soft); max-width: 62ch; }

/* Scrollytelling: RivetOS */
.scrolly { margin-top: clamp(40px, 6vw, 72px); display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(28px, 5vw, 64px); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; }
.step { padding-block: clamp(28px, 10vh, 120px); border-top: 1px solid var(--rule); opacity: .45; transition: opacity .35s; }
.step:first-child { border-top: 0; padding-top: 8px; }
.step.is-active { opacity: 1; }
.step-tag { color: var(--green); }
.step h3 { margin-top: 10px; font-size: clamp(1.6rem, 2.6vw, 2.2rem); font-weight: 700; }
.step p:last-child { margin-top: 12px; color: var(--soft); max-width: 46ch; }
.stage { position: sticky; top: 96px; align-self: start; }
.stage-frame { position: relative; aspect-ratio: 1280 / 800; max-width: 100%; border-radius: 14px; overflow: hidden; border: 1px solid var(--rule); box-shadow: var(--shadow); background: var(--term-bg); }
.shot { margin: 0; position: absolute; inset: 0; opacity: 0; transform: scale(1.02); transition: opacity .5s ease, transform .7s ease; }
.shot.is-active { opacity: 1; transform: none; }
.shot img { width: 100%; height: 100%; object-fit: cover; }
.shot figcaption {
  position: absolute; left: 12px; bottom: 12px; padding: 6px 10px; border-radius: 8px;
  background: rgba(8, 17, 12, .78); color: #e6ece2; font-size: 13px;
}
.stage-note { margin-top: 10px; font-size: 13px; color: var(--faint); }
:root:not(.js) .shot { position: relative; opacity: 1; transform: none; }
:root:not(.js) .stage-frame { aspect-ratio: auto; }
:root:not(.js) .step { opacity: 1; }

.proof { margin-top: clamp(56px, 8vw, 96px); padding-top: 28px; border-top: 1px solid var(--rule); }
.proof-title { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--soft); font-weight: 400; }
.proof-list { margin: 20px 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; }
.proof-list dt { font-weight: 700; font-size: 18px; letter-spacing: -.02em; }
.proof-list dd { margin: 8px 0 0; color: var(--soft); font-size: 15px; }

/* RivetHub */
.gallery { margin: clamp(40px, 6vw, 64px) 0 0; }
.gallery-frame { aspect-ratio: 1280 / 800; max-width: 100%; border-radius: 16px; overflow: hidden; border: 1px solid var(--rule); box-shadow: var(--shadow); background: var(--term-bg); }
.gallery-frame img { width: 100%; height: 100%; object-fit: cover; transition: opacity .25s; }
.gallery-frame img.is-swapping { opacity: .2; }
.gallery figcaption { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; font-size: 14px; color: var(--soft); }
.swatches { display: flex; flex-wrap: wrap; gap: 6px; }
.swatches button {
  font: 500 13px var(--font-ui); color: var(--soft); cursor: pointer;
  display: inline-flex; align-items: center; gap: 7px; padding: 5px 11px 5px 6px;
  border-radius: 999px; border: 1px solid var(--rule); background: var(--surface);
}
.swatches button::before { content: ""; width: 14px; height: 14px; border-radius: 50%; background: var(--sw); border: 1px solid rgba(128, 128, 128, .45); }
.swatches button[aria-pressed="true"] { color: var(--ink); border-color: var(--green); }

.paths { margin-top: clamp(40px, 6vw, 64px); display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.path { display: flex; flex-direction: column; gap: 14px; padding: clamp(22px, 3vw, 32px); background: var(--surface); border: 1px solid var(--rule); border-radius: 16px; }
.path-tag { color: var(--green); }
.path h3 { font-size: 26px; font-weight: 700; }
.path > p:not(.path-tag) { color: var(--soft); }
.path .text-link { margin-top: auto; }
.clients { margin-top: 22px; color: var(--soft); font-size: 15px; }

/* Terminals */
.term { position: relative; background: var(--term-bg); color: var(--term-ink); border-radius: 12px; overflow: hidden; }
.term-bar { color: var(--term-dim); padding: 10px 14px 0; font-size: 11px; }
.term pre { margin: 0; padding: 10px 84px 14px 14px; overflow-x: auto; font: 13.5px/1.55 var(--font-mono); }
.term code { background: none; padding: 0; font-size: inherit; color: inherit; white-space: pre; }
.term .ps { color: var(--term-dim); user-select: none; }
.term-inline pre { padding-top: 13px; }
.term-inline .copy { bottom: 50%; transform: translateY(50%); }
.term .copy {
  position: absolute; right: 10px; bottom: 10px;
  font: 12px var(--font-mono); color: var(--term-ink); background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .14); border-radius: 6px; padding: 4px 9px; cursor: pointer;
}
.term .copy:hover { background: rgba(255, 255, 255, .16); }

/* Rivet Cloud */
.cloud-grid { margin-top: clamp(40px, 6vw, 64px); display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(28px, 5vw, 56px); align-items: start; }
.cloud-points { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.cloud-points li { padding-left: 22px; position: relative; color: var(--soft); }
.cloud-points li::before { content: ""; position: absolute; left: 0; top: .6em; width: 9px; height: 9px; border-radius: 50%; border: 2px solid var(--sky); }
.cloud-points strong { color: var(--ink); display: block; font-size: 18px; letter-spacing: -.01em; }
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.plan { padding: 24px; border: 1px solid var(--rule); border-radius: 16px; background: var(--surface); }
.plan-pro { border-color: var(--sky); background: linear-gradient(var(--sky-wash), var(--surface) 70%); }
.plan h3 { font-size: 18px; font-weight: 700; }
.price { margin-top: 12px; color: var(--soft); font-variant-numeric: tabular-nums; }
.price b { font-size: 44px; letter-spacing: -.04em; color: var(--ink); }
.price-alt { font-size: 13px; color: var(--faint); }
.plan ul { margin: 18px 0 0; padding: 16px 0 0; border-top: 1px solid var(--rule); list-style: none; display: grid; gap: 6px; font-size: 15px; color: var(--soft); }
.plan li::before { content: "+ "; color: var(--sky); font-family: var(--font-mono); }
.chapter-cloud .btn-cloud { margin-top: 28px; }

/* Grow route */
.route { list-style: none; margin: clamp(40px, 6vw, 64px) 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); position: relative; }
.route::before {
  content: ""; position: absolute; left: 9px; right: 9px; top: 8px; height: 2px;
  background: repeating-linear-gradient(90deg, var(--brass) 0 8px, transparent 8px 14px);
  background-size: 28px 2px; animation: march 1.6s linear infinite;
}
@keyframes march { to { background-position: 28px 0; } }
.route-stop { position: relative; padding: 36px 24px 0 0; display: grid; gap: 8px; align-content: start; }
.route-dot { position: absolute; top: 0; left: 0; width: 18px; height: 18px; border-radius: 50%; background: var(--paper); border: 2px solid var(--brass); }
.route-cloud .route-dot { border-color: var(--sky); }
.route-where { color: var(--ink); font-size: 13px; font-weight: 700; }
.route-what { color: var(--soft); font-size: 15px; max-width: 34ch; }
.route-foot { margin-top: 32px; color: var(--soft); font-size: 15px; }

/* Start */
.start { margin-top: clamp(80px, 11vw, 140px); background: var(--term-bg); color: var(--term-ink); padding-block: clamp(56px, 8vw, 104px); }
.start-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.start .kicker { color: var(--term-dim); }
.start h2 { margin-top: 14px; font-size: clamp(2.2rem, 4.6vw, 3.6rem); font-weight: 700; color: #f1f4ec; }
.start p { color: #b9c7bf; }
.start-grid > div:first-child p:not(.kicker) { margin-top: 18px; max-width: 48ch; }
.start a:not(.btn) { color: #8bd6af; }
.start .btn-primary { margin-top: 28px; background: #8bd6af; border-color: #8bd6af; color: #0b1a12; }
.start .btn-primary:hover { background: #a9e6c5; border-color: #a9e6c5; }
.start-terms { display: grid; gap: 12px; }
.start .term { background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .09); }
.start .small { font-size: 14px; color: #8ea298; }

/* FAQ */
.faq { padding-block: clamp(64px, 9vw, 112px); }
.faq-grid { display: grid; grid-template-columns: minmax(0, .6fr) minmax(0, 1.4fr); gap: clamp(24px, 5vw, 64px); }
.faq h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; }
.faq-list details { border-top: 1px solid var(--rule); }
.faq-list details:last-child { border-bottom: 1px solid var(--rule); }
.faq-list summary { cursor: pointer; list-style: none; padding: 18px 32px 18px 0; font-weight: 500; font-size: 18px; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 14px; font: 22px var(--font-mono); color: var(--green); transition: transform .2s; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p { padding-bottom: 20px; color: var(--soft); max-width: 64ch; }

/* Final */
.final { padding-block: clamp(72px, 10vw, 128px); border-top: 1px solid var(--rule); text-align: left; }
.final h2 { font-size: clamp(2.8rem, 7vw, 5.6rem); font-weight: 700; letter-spacing: -.045em; line-height: .98; }
.final h2 em { font-style: normal; color: var(--green); }
.final .cta-row { margin-top: 32px; }
.final p { margin-top: 18px; color: var(--faint); }

/* Footer */
.foot { border-top: 1px solid var(--rule); padding-block: 40px 96px; font-size: 15px; }
.foot-inner { display: flex; flex-wrap: wrap; gap: 28px 48px; justify-content: space-between; align-items: flex-start; }
.foot p { margin-top: 10px; color: var(--soft); }
.foot nav { display: grid; grid-template-columns: repeat(3, auto); gap: 8px 28px; }
.foot nav a { color: var(--soft); text-decoration: none; }
.foot nav a:hover { color: var(--ink); }
.theme-control { display: grid; gap: 6px; font-size: 13px; color: var(--soft); }
.theme-control select { font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: 8px; padding: 6px 8px; }

/* Sticky CTA */
.sticky-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 15;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--rule);
  transform: translateY(0); transition: transform .3s ease;
}
.sticky-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px 24px; padding-block: 12px; flex-wrap: wrap; }
.sticky-inner p { font-weight: 700; letter-spacing: -.02em; }
.sticky-inner .btn { padding: 9px 16px; font-size: 15px; }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid, .problem-grid, .cloud-grid, .start-grid, .faq-grid { grid-template-columns: minmax(0, 1fr); }
  .scrolly { grid-template-columns: minmax(0, 1fr); }
  .stage { position: relative; top: 0; order: -1; }
  .steps .step { padding-block: 24px; opacity: 1; }
  .proof-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
  :root { --spine-x: 0px; }
  .spine, .stud { display: none; }
  .chapter > .wrap { padding-left: var(--gutter); }
  .trio { grid-template-columns: minmax(0, 1fr); }
  .trio a, .trio a + a { padding: 16px 0; border-right: 0; border-bottom: 1px solid var(--rule); }
  .paths, .plans, .proof-list { grid-template-columns: minmax(0, 1fr); }
  .route { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .route::before { left: 8px; right: auto; top: 9px; bottom: 9px; width: 2px; height: auto; background: repeating-linear-gradient(180deg, var(--brass) 0 8px, transparent 8px 14px); animation: none; }
  .route-stop { padding: 0 0 0 36px; }
  .silo { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .silo:nth-child(odd), .silo:nth-child(even) { transform: none; }
  .foot nav { grid-template-columns: repeat(2, auto); }
  .sticky-inner p { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}