/* google.warren.digital · "Program: the missing component page"
   M3 Expressive baseline light theme. Every value below is a real Material token. */

:root {
  /* color.sys */
  --md-primary: #6750A4;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #EADDFF;
  --md-on-primary-container: #21005D;
  --md-secondary: #625B71;
  --md-secondary-container: #E8DEF8;
  --md-on-secondary-container: #1D192B;
  --md-tertiary: #7D5260;
  --md-tertiary-container: #FFD8E4;
  --md-on-tertiary-container: #31111D;
  --md-error: #B3261E;
  --md-error-container: #F9DEDC;
  --md-surface: #FEF7FF;
  --md-surface-dim: #DED8E1;
  --md-on-surface: #1D1B20;
  --md-on-surface-variant: #49454F;
  --md-outline: #79747E;
  --md-outline-variant: #CAC4D0;
  --md-inverse-surface: #322F35;
  --md-inverse-on-surface: #F5EFF7;
  --md-inverse-primary: #D0BCFF;
  --md-sc-lowest: #FFFFFF;
  --md-sc-low: #F7F2FA;
  --md-sc: #F3EDF7;
  --md-sc-high: #ECE6F0;
  --md-sc-highest: #E6E0E9;
  --md-caption: #5F6368;

  /* shape.sys */
  --shape-xs: 4px; --shape-sm: 8px; --shape-md: 12px; --shape-lg: 16px;
  --shape-lg-inc: 20px; --shape-xl: 28px; --shape-xl-inc: 32px; --shape-xxl: 48px;
  --shape-full: 999px;

  /* motion.sys (expressive spatial approximations + effects) */
  --spring-fast: 350ms cubic-bezier(0.42, 1.67, 0.21, 0.90);
  --spring-default: 500ms cubic-bezier(0.38, 1.21, 0.22, 1.00);
  --spring-slow: 650ms cubic-bezier(0.39, 1.29, 0.35, 0.98);
  --effects-fast: 150ms cubic-bezier(0.31, 0.94, 0.34, 1.00);
  --effects-default: 200ms cubic-bezier(0.34, 0.80, 0.34, 1.00);
  --emphasized: cubic-bezier(0.2, 0, 0, 1);

  --font-brand: "Google Sans Flex", "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-code: "Google Sans Code", "Roboto Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: var(--font-brand);
  font-size: 16px; line-height: 24px; letter-spacing: 0.5px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--md-primary-container); color: var(--md-on-primary-container); }

/* ---------- M3 type scale ---------- */
.display-lg { font-size: clamp(40px, 6.2vw, 57px); line-height: 1.12; font-weight: 500; letter-spacing: -0.25px; }
.display-md { font-size: clamp(34px, 4.8vw, 45px); line-height: 1.15; font-weight: 500; letter-spacing: 0; }
.display-sm { font-size: clamp(28px, 4vw, 36px); line-height: 1.22; font-weight: 500; }
.headline-lg { font-size: 32px; line-height: 40px; font-weight: 500; }
.headline-md { font-size: 28px; line-height: 36px; font-weight: 500; }
.headline-sm { font-size: 24px; line-height: 32px; font-weight: 500; }
.title-lg { font-size: 22px; line-height: 28px; font-weight: 500; }
.title-md { font-size: 16px; line-height: 24px; font-weight: 500; letter-spacing: 0.15px; }
.title-sm { font-size: 14px; line-height: 20px; font-weight: 700; letter-spacing: 0.1px; }
.body-lg { font-size: 16px; line-height: 24px; letter-spacing: 0.5px; }
.body-md { font-size: 14px; line-height: 20px; letter-spacing: 0.25px; }
.body-sm { font-size: 12px; line-height: 16px; letter-spacing: 0.4px; }
.label-lg { font-size: 14px; line-height: 20px; font-weight: 500; letter-spacing: 0.1px; }
.label-md { font-size: 12px; line-height: 16px; font-weight: 500; letter-spacing: 0.5px; }
.label-sm { font-size: 11px; line-height: 16px; font-weight: 500; letter-spacing: 0.5px; }
.code { font-family: var(--font-code); font-weight: 500; }

/* ---------- layout ---------- */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
section { padding: 88px 0; }
section.tight { padding: 56px 0; }

.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-code); font-size: 13px; letter-spacing: 0.6px;
  color: var(--md-primary); font-weight: 600;
  margin-bottom: 18px;
}
.dots { display: inline-flex; gap: 5px; }
.dots i {
  width: 7px; height: 7px; border-radius: 50%; display: inline-block;
  background: var(--md-primary);
}
.dots i:nth-child(2) { background: var(--md-tertiary); }
.dots i:nth-child(3) { background: var(--md-secondary); }
.dots i:nth-child(4) { background: var(--md-inverse-primary); }

.section-head { max-width: 760px; }
.section-head h2 { margin: 0 0 14px; letter-spacing: -0.25px; }
.section-head .lede { color: var(--md-on-surface-variant); margin: 0; font-size: 17px; line-height: 26px; }
.caption { color: var(--md-caption); font-size: 13px; line-height: 19px; letter-spacing: 0.25px; }

/* ---------- reveal ---------- */
/* Entering content decelerates into place. It does not overshoot: a spring on
   every paragraph is a spring token applied without regard to what it means. */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 300ms cubic-bezier(0.05,0.7,0.1,1), transform 400ms cubic-bezier(0.05,0.7,0.1,1); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- state layer ---------- */

/* ---------- buttons ---------- */
.btn {
  appearance: none; border: none; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 48px; padding: 0 26px; border-radius: var(--shape-full);
  font-family: var(--font-brand); font-size: 15px; font-weight: 600; letter-spacing: 0.1px;
  color: var(--md-on-primary); background: var(--md-primary);
  transition: border-radius var(--spring-fast), background var(--effects-default), box-shadow var(--effects-default), transform var(--spring-fast);
  text-decoration: none;
}
.btn::after {
  content: ""; position: absolute; inset: 0; background: currentColor;
  opacity: 0; transition: opacity var(--effects-fast); pointer-events: none;
  border-radius: inherit;
}
.btn { position: relative; overflow: hidden; }
.btn:hover::after { opacity: 0.08; }
.btn:active::after { opacity: 0.12; }
.btn:focus-visible, .spec-row:focus-visible, .log-head:focus-visible, .rail-node:focus-visible, .fab:focus-visible, .fab-item:focus-visible {
  outline: 2px solid var(--md-primary); outline-offset: 2px;
}
.btn:active { border-radius: var(--shape-lg); transform: scale(0.985); }
.btn.tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.btn.outlined { background: transparent; color: var(--md-primary); box-shadow: inset 0 0 0 1px var(--md-outline); }
.btn.large { height: 60px; padding: 0 32px; font-size: 16px; }

/* Programmatic focus targets. On unlock we move focus to the hero h1 so keyboard
   and screen reader users land inside the page instead of on a dialog that just
   faded out. The browser then paints its default focus ring around the headline,
   which is the first thing every visitor sees. Suppressing it is safe: a
   tabindex="-1" element is never reachable by Tab, so no keyboard user can arrive
   here and be left without an indicator. */
[tabindex="-1"]:focus, [tabindex="-1"]:focus-visible { outline: none; }

/* connected button group */
.btn-group { display: inline-flex; gap: 2px; }
.btn-group .btn {
  border-radius: var(--shape-sm); background: var(--md-sc-high); color: var(--md-on-surface);
  height: 44px; font-weight: 500;
}
.btn-group .btn:first-child { border-top-left-radius: var(--shape-full); border-bottom-left-radius: var(--shape-full); }
.btn-group .btn:last-child { border-top-right-radius: var(--shape-full); border-bottom-right-radius: var(--shape-full); }
.btn-group .btn[aria-pressed="true"] {
  background: var(--md-primary); color: var(--md-on-primary); border-radius: var(--shape-full);
}

/* ---------- chips ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  height: 32px; padding: 0 14px; border-radius: var(--shape-sm);
  background: var(--md-sc-low); color: var(--md-on-surface-variant);
  box-shadow: inset 0 0 0 1px var(--md-outline-variant);
  font-size: 13px; font-weight: 500; letter-spacing: 0.1px; white-space: nowrap;
}
.chip.code { font-family: var(--font-code); font-size: 12px; }
.chip.tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); box-shadow: none; }
.chip.primary { background: var(--md-primary-container); color: var(--md-on-primary-container); box-shadow: none; }

/* ---------- cards ---------- */

/* =========================================================
   GATE
   ========================================================= */
.gate {
  position: fixed; inset: 0; z-index: 100;
  background: var(--md-surface);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 500ms var(--emphasized), visibility 500ms;
}
.gate.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.gate-inner { width: min(400px, calc(100vw - 48px)); text-align: center; }
.gate-shape { width: 120px; height: 120px; margin: 0 auto 26px; display: block; }
.gate-shape path { fill: var(--md-primary); }
.gate h1 { margin: 0 0 6px; font-size: 26px; font-weight: 500; letter-spacing: -0.2px; }
.gate .gate-sub { color: var(--md-on-surface-variant); margin: 0 0 30px; font-size: 14px; line-height: 20px; }

/* M3 outlined text field */
.field { position: relative; text-align: left; }
.field input {
  width: 100%; height: 56px; padding: 0 52px 0 16px;
  font-family: var(--font-code); font-size: 16px; letter-spacing: 0.5px;
  color: var(--md-on-surface); background: transparent;
  border: 1px solid var(--md-outline); border-radius: var(--shape-xs);
  outline: none; transition: border var(--effects-default), box-shadow var(--effects-default);
  caret-color: var(--md-primary);
}
.field label {
  position: absolute; left: 12px; top: 16px; padding: 0 4px;
  background: var(--md-surface); color: var(--md-on-surface-variant);
  font-size: 16px; pointer-events: none;
  transition: all var(--effects-default);
}
.field input:focus { border: 2px solid var(--md-primary); box-shadow: none; padding-left: 15px; }
.field input:focus + label, .field input:not(:placeholder-shown) + label {
  top: -8px; font-size: 12px; color: var(--md-primary); font-weight: 500;
}
.field .supporting { margin: 6px 16px 0; font-size: 12px; line-height: 16px; color: var(--md-on-surface-variant); }
.field.error input { border-color: var(--md-error); }
.field.error input:focus { border: 2px solid var(--md-error); }
.field.error label, .field.error input:focus + label { color: var(--md-error); }
.field.error .supporting { color: var(--md-error); }
.field .go {
  position: absolute; right: 8px; top: 8px; width: 40px; height: 40px;
  border: none; border-radius: var(--shape-full); cursor: pointer;
  background: var(--md-primary-container); color: var(--md-on-primary-container);
  font-size: 18px; display: flex; align-items: center; justify-content: center;
  transition: border-radius var(--spring-fast), background var(--effects-default);
}
.field .go:active { border-radius: var(--shape-md); }
.gate.shake .gate-inner { animation: gateShake 320ms var(--emphasized); }
@keyframes gateShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); } 55% { transform: translateX(7px); } 80% { transform: translateX(-4px); }
}
.gate-disclaimer { margin-top: 40px; font-size: 11px; color: var(--md-caption); }

/* =========================================================
   HERO / OVERVIEW
   ========================================================= */
.hero { padding: 96px 0 72px; position: relative; overflow: clip; }
.hero .breadcrumb {
  font-family: var(--font-code); font-size: 13px; color: var(--md-on-surface-variant);
  display: flex; gap: 8px; align-items: center; margin-bottom: 34px; flex-wrap: wrap;
}
.hero .breadcrumb b { color: var(--md-on-surface); font-weight: 600; }
.hero h1 { margin: 0 0 22px; max-width: 900px; }
.hero .hero-sub { max-width: 620px; color: var(--md-on-surface-variant); font-size: 18px; line-height: 28px; margin: 0 0 36px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

.hero-bg-shape {
  position: absolute; right: -100px; top: 40px; width: 460px; height: 460px;
  opacity: 0.55; pointer-events: none;
}
.hero-bg-shape path { fill: var(--md-primary-container); }

/* component preview card */
.preview-card {
  margin-top: 64px; background: var(--md-sc-low); border-radius: var(--shape-xl-inc);
  padding: 0; overflow: hidden;
}
.preview-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 18px 26px; border-bottom: 1px solid var(--md-outline-variant); flex-wrap: wrap;
}
.preview-head .name { font-family: var(--font-code); font-weight: 600; font-size: 14px; }
.preview-stage {
  min-height: 300px; display: flex; align-items: center; justify-content: center;
  padding: 44px 26px; position: relative;
}
.preview-state { display: none; text-align: center; max-width: 560px; }
.preview-state.active { display: block; animation: stateIn 500ms var(--emphasized); }
@keyframes stateIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.preview-state .big { font-size: clamp(26px, 3.4vw, 34px); font-weight: 500; line-height: 1.25; margin: 0 0 12px; letter-spacing: -0.2px; }
.preview-state p { color: var(--md-on-surface-variant); margin: 0; font-size: 15px; line-height: 23px; }

/* =========================================================
   SPECS TABLE
   ========================================================= */
.spec-table { width: 100%; border-collapse: separate; border-spacing: 0 6px; margin-top: 44px; }
.spec-table th {
  text-align: left; font-size: 12px; letter-spacing: 0.8px; text-transform: uppercase;
  color: var(--md-on-surface-variant); font-weight: 700; padding: 0 18px 14px;
}
.spec-table td { padding: 18px; vertical-align: top; }
.spec-row { cursor: pointer; border-radius: var(--shape-lg); }
.spec-table tbody tr {
  background: var(--md-sc-lowest);
  transition: background var(--effects-fast), transform var(--spring-fast);
}
.spec-table tbody tr:hover { background: var(--md-sc-high); }
.spec-table tbody tr td:first-child { border-radius: var(--shape-lg) 0 0 var(--shape-lg); width: 46%; }
.spec-table tbody tr td:last-child { border-radius: 0 var(--shape-lg) var(--shape-lg) 0; }
.spec-req { font-weight: 600; font-size: 15px; line-height: 22px; }
.spec-proof { color: var(--md-on-surface-variant); font-size: 14px; line-height: 21px; }
.spec-proof .code { color: var(--md-primary); font-size: 12px; }
.spec-num {
  font-family: var(--font-code); color: var(--md-caption); font-size: 12px; width: 40px;
}

/* =========================================================
   INFOGRAPHIC: MIGRATION (6 of 8)
   ========================================================= */
.info-shell { margin-top: 48px; background: var(--md-sc-low); border-radius: var(--shape-xl-inc); padding: clamp(24px, 4vw, 48px); }
.migration-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: center; }
.mig-tiles { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
.mig-tile {
  border-radius: var(--shape-lg); background: var(--md-sc-lowest);
  padding: 14px 16px; font-size: 13px; font-weight: 600; letter-spacing: 0.1px;
  box-shadow: inset 0 0 0 1px var(--md-outline-variant);
  transition: transform var(--spring-default), background var(--effects-default), box-shadow var(--effects-default), opacity var(--effects-default);
  display: flex; align-items: center; gap: 8px;
}
.mig-tile .st { width: 8px; height: 8px; border-radius: 50%; background: var(--md-outline-variant); flex: none; transition: background var(--effects-default); }
.mig-tile.migrated.done { background: var(--md-primary-container); color: var(--md-on-primary-container); box-shadow: none; }
.mig-tile.migrated.done .st { background: var(--md-primary); }
.mig-arrow { display: flex; flex-direction: column; align-items: center; gap: 6px; color: var(--md-primary); }
.mig-node {
  border-radius: var(--shape-xl); background: var(--md-primary); color: var(--md-on-primary);
  padding: 26px 24px; text-align: center;
  transition: transform var(--spring-default);
}
.mig-node .code { font-size: 13px; opacity: 0.85; }
.mig-node .headline-sm { margin: 6px 0 0; }
.mig-stat { display: flex; gap: clamp(24px, 5vw, 64px); margin-top: 44px; flex-wrap: wrap; align-items: flex-end; }
.big-stat .n {
  font-size: clamp(56px, 9vw, 96px); font-weight: 500; line-height: 0.95; letter-spacing: -2px;
  color: var(--md-primary); font-variant-numeric: tabular-nums;
}
.big-stat .cap { margin-top: 10px; }
.bars { flex: 1; min-width: 260px; display: grid; gap: 14px; align-content: end; }
.bar-row { display: grid; grid-template-columns: 92px 1fr; gap: 12px; align-items: center; }
.bar-row .lbl { font-size: 13px; color: var(--md-on-surface-variant); font-weight: 500; }
.bar-track { height: 26px; border-radius: var(--shape-full); background: var(--md-sc-high); overflow: hidden; }
.bar-fill {
  height: 100%; border-radius: var(--shape-full); background: var(--md-primary);
  width: 0; transition: width 900ms var(--emphasized);
  display: flex; align-items: center; justify-content: flex-end; padding-right: 10px;
  color: var(--md-on-primary); font-size: 12px; font-weight: 600; min-width: 36px;
}
.bar-fill.tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }

/* =========================================================
   INFOGRAPHIC: ANDROID 12 TIMELINE
   ========================================================= */
.tl-lanes { display: grid; gap: 12px; margin-top: 8px; position: relative; }
.tl-lane { display: grid; grid-template-columns: 118px 1fr; gap: 14px; align-items: center; }
.tl-lane .lbl { font-size: 13px; font-weight: 600; color: var(--md-on-surface-variant); }
.tl-track { position: relative; height: 30px; }
.tl-seg {
  position: absolute; top: 0; height: 30px; border-radius: var(--shape-full);
  background: var(--md-secondary-container);
  transition: left var(--spring-fast), width var(--spring-fast), background var(--effects-default);
  display: flex; align-items: center; padding: 0 12px; font-size: 11px; font-weight: 600;
  color: var(--md-on-secondary-container); white-space: nowrap; overflow: hidden;
}
.tl-seg.active { background: var(--md-primary); color: var(--md-on-primary); }
.tl-wrap { position: relative; margin-top: 40px; }
.tl-dateline {
  position: absolute; top: -14px; bottom: -14px; width: 3px; border-radius: 2px;
  background: var(--md-on-surface); right: 8%; z-index: 1;
}
.tl-track { z-index: 2; }
.tl-dateline .flag {
  position: absolute; top: -34px; right: -8px; transform: translateX(50%);
  background: var(--md-inverse-surface); color: var(--md-inverse-on-surface);
  padding: 5px 12px; border-radius: var(--shape-full); font-size: 11px; font-weight: 700;
  letter-spacing: 0.4px; white-space: nowrap;
}
.tl-scrub { margin-top: 52px; display: grid; gap: 8px; }
.tl-scrub input[type="range"]:focus-visible { outline: 3px solid var(--md-tertiary); outline-offset: 4px; }
.tl-scrub input[type="range"] {
  width: 100%; appearance: none; height: 4px; border-radius: 2px;
  background: var(--md-sc-highest); outline: none;
}
.tl-scrub input[type="range"]::-webkit-slider-thumb {
  appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--md-primary); cursor: pointer; border: none;
  box-shadow: 0 0 0 8px rgba(103, 80, 164, 0.12);
  box-shadow: 0 0 0 8px color-mix(in srgb, var(--md-primary) 12%, transparent);
}
.tl-scrub .scrub-lbl { display: flex; justify-content: space-between; }

/* =========================================================
   INFOGRAPHIC: RELAY, SIX-STAGE ANATOMY
   Replaces the old funnel. The funnel showed nine identical chips
   landing in three equal piles, which is a picture of no
   prioritization happening. This shows the request record itself.
   ========================================================= */

/* --- stage rail --- */
.rail {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 0;
  border-radius: var(--shape-full); overflow: hidden;
  box-shadow: inset 0 0 0 1px var(--md-outline);
  margin-bottom: 26px; background: var(--md-sc-lowest);
}
.rail-node {
  position: relative; display: flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 8px 6px; border: none; cursor: pointer; background: transparent;
  font-family: var(--font-brand); font-size: 14px; line-height: 20px; font-weight: 500;
  letter-spacing: 0.1px; color: var(--md-on-surface-variant);
  transition: background var(--effects-default), color var(--effects-default);
}
.rail-node + .rail-node { box-shadow: inset 1px 0 0 0 var(--md-outline-variant); }
.rail-node::after {
  content: ""; position: absolute; inset: 0; background: currentColor;
  opacity: 0; transition: opacity var(--effects-fast); pointer-events: none;
}
.rail-node:hover::after { opacity: 0.08; }
.rail-node:active::after { opacity: 0.10; }
.rail-node:focus-visible { outline: 3px solid var(--md-tertiary); outline-offset: -3px; }
.rail-node .rn-l { white-space: nowrap; }
.rail-node .rn-i {
  width: 22px; height: 22px; border-radius: 50%; flex: none;
  display: grid; place-items: center;
  font-family: var(--font-code); font-size: 11px; font-weight: 700;
  background: var(--md-sc-highest); color: var(--md-on-surface-variant);
  transition: background var(--effects-default), color var(--effects-default);
}
.rail-node[aria-selected="true"] { background: var(--md-secondary-container); color: var(--md-on-primary-container); }
.rail-node[aria-selected="true"] .rn-i { background: var(--md-primary); color: var(--md-on-primary); }
.rail-node.done .rn-i { background: var(--md-primary-container); color: var(--md-on-primary-container); }

/* --- body: stage panel + inspector --- */
.relay-body { display: grid; grid-template-columns: 1fr 300px; gap: 26px; align-items: start; }
.relay-stages { position: relative; min-height: 340px; }
.rstage { display: none; }
.rstage.active { display: block; animation: axisIn 260ms cubic-bezier(0, 0, 0, 1) both; }
@keyframes axisIn { from { opacity: 0; transform: translateX(var(--ax, 24px)); } to { opacity: 1; transform: none; } }
.rstage h3 { font-size: 24px; line-height: 32px; font-weight: 600; letter-spacing: 0; margin: 14px 0 10px; }
.rstage p { font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); max-width: 62ch; }
.rstage .caption { display: block; margin-top: 16px; }

/* stage 1: mismatched sheets */
.sheets { display: flex; align-items: flex-end; gap: 10px; margin-top: 22px; height: 92px; }
.sheet {
  flex: 1; border-radius: var(--shape-sm) var(--shape-sm) var(--shape-xs) var(--shape-xs);
  background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline);
  position: relative; overflow: hidden;
}
.sheet::before, .sheet::after {
  content: ""; position: absolute; left: 8px; right: 8px; height: 3px; border-radius: 2px;
  background: var(--md-outline-variant);
}
.sheet::before { top: 12px; }
.sheet::after { top: 22px; right: 40%; }
/* deliberately unequal: the inputs do not match, that is the whole problem */
.sheet.s1 { height: 78%; } .sheet.s2 { height: 100%; } .sheet.s3 { height: 62%; }
.sheet.s4 { height: 88%; } .sheet.s5 { height: 54%; } .sheet.s6 { height: 94%; }

/* stage 2: the messy source cell */
.prose-cell {
  margin-top: 20px; padding: 18px 20px; border-radius: var(--shape-lg);
  background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline);
}
.prose-cell p {
  font-family: var(--font-code); font-size: 14px; line-height: 22px;
  color: var(--md-on-surface); margin-top: 6px;
}
.cell-lbl { display: block; text-transform: uppercase; letter-spacing: 0.5px; font-weight: 700; }

/* stage 3: normalization pairs */
.norm-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 10px; }
.norm-list li {
  display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center;
  padding: 12px 18px; border-radius: var(--shape-md);
  background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline-variant);
}
.norm-list .from { font-size: 13px; color: var(--md-on-surface-variant); }
.norm-list .to { font-size: 13px; font-weight: 700; color: var(--md-on-primary-container); }
.norm-list .to.missing { color: var(--md-error); }
.norm-list li.gap { box-shadow: inset 0 0 0 1px var(--md-error); }

/* stage 4: the follow-up loop */
.followup { margin-top: 20px; display: grid; gap: 14px; }
.fu-mail {
  padding: 18px 20px; border-radius: var(--shape-lg);
  background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline);
}
.fu-mail p { font-size: 14px; line-height: 22px; color: var(--md-on-surface); margin-top: 6px; }
.fu-state { display: flex; gap: 8px; flex-wrap: wrap; }
.fu-chip {
  min-height: 32px; display: inline-flex; align-items: center; padding: 6px 16px;
  border-radius: var(--shape-full); font-family: var(--font-code); font-size: 12px;
  background: var(--md-sc-highest); color: var(--md-on-surface-variant);
}
.fu-chip.done { background: var(--md-primary); color: var(--md-on-primary); }

/* stage 5: ranking with reasons */
.rank-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 10px; }
.rank-list li {
  display: grid; grid-template-columns: 104px 1fr auto; gap: 14px; align-items: center;
  padding: 12px 18px; border-radius: var(--shape-md);
  background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline-variant);
}
.rank-list .lane {
  text-align: center; padding: 5px 10px; border-radius: var(--shape-full);
  font-size: 11px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase;
}
.rank-list .lane.now { background: var(--md-primary); color: var(--md-on-primary); }
.rank-list .lane.next { background: var(--md-secondary-container); color: var(--md-on-primary-container); }
.rank-list .lane.hold { background: var(--md-error); color: #fff; }
.rank-list .rk-t { font-size: 14px; font-weight: 600; }
.rank-list .rk-w { font-size: 12px; color: var(--md-on-surface-variant); }
.rank-list li.held { box-shadow: inset 0 0 0 1px var(--md-error); }

/* stage 6: the payload */
.emit {
  margin-top: 20px; padding: 18px 20px; border-radius: var(--shape-lg);
  background: var(--md-inverse-surface);
}
.emit .cell-lbl { color: #CFC7D4; }
.emit pre {
  margin: 8px 0 0; font-family: var(--font-code); font-size: 13px; line-height: 22px;
  color: #F2ECF6; white-space: pre-wrap;
}

/* --- inspector: the request record, mutating --- */
.inspector {
  border-radius: var(--shape-xl); background: var(--md-sc-lowest);
  box-shadow: inset 0 0 0 1px var(--md-outline); padding: 20px; position: sticky; top: 24px;
}
.insp-head {
  display: flex; justify-content: space-between; align-items: baseline; gap: 10px;
  padding-bottom: 12px; border-bottom: 1px solid var(--md-outline-variant);
}
.insp-head .insp-stage { white-space: nowrap; }
.insp-head .code { font-size: 12px; font-weight: 700; color: var(--md-on-surface); }
.insp-fields { margin: 14px 0 0; display: grid; gap: 2px; }
.insp-fields .f {
  display: grid; grid-template-columns: 88px 1fr; gap: 10px; align-items: baseline;
  padding: 7px 8px; border-radius: var(--shape-xs);
  opacity: 0.28; transition: opacity 260ms var(--emphasized), background 260ms var(--emphasized);
}
.insp-fields .f.on { opacity: 1; }
.insp-fields .f.just { background: var(--md-secondary-container); }
.insp-fields dt {
  font-family: var(--font-code); font-size: 11px; letter-spacing: 0.4px;
  color: var(--md-on-surface-variant);
}
.insp-fields dd { margin: 0; font-size: 13px; font-weight: 600; color: var(--md-on-surface); word-break: break-word; }
.insp-fields .f.missing dd { color: var(--md-error); font-family: var(--font-code); font-weight: 700; }
.insp-note { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--md-outline-variant); }

.relay-controls { margin-top: 26px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.relay-controls .caption { flex: 1 1 320px; }

/* =========================================================
   BUILT WITH AI
   ========================================================= */
.ai-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin-top: 44px; }
.ai-card {
  border-radius: var(--shape-xxl); background: var(--md-sc-lowest);
  box-shadow: inset 0 0 0 1px var(--md-outline); padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
}
.ai-card header { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.ai-card .ai-dom { flex: 1 0 100%; text-transform: uppercase; letter-spacing: 0.5px; font-weight: 700; }
.ai-card h3 { font-size: 22px; line-height: 28px; font-weight: 700; letter-spacing: 0; margin: 0; flex: 1; }
.ai-card .ai-status { flex: none; }
.ai-card p { font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); margin: 0; }
.ai-card .ai-prob { color: var(--md-on-surface); }
.ai-card .ai-hard b, .ai-card .ai-human b { color: var(--md-on-surface); font-weight: 700; }
.ai-card .ai-hard { padding-left: 14px; border-left: 3px solid var(--md-primary); }
.ai-card .ai-human { padding-left: 14px; border-left: 3px solid var(--md-tertiary); }
.ai-link {
  margin-top: auto; align-self: flex-start; font-family: var(--font-code); font-size: 13px;
  font-weight: 700; color: var(--md-primary); text-decoration: none;
}
.ai-link:hover { text-decoration: underline; }
.ai-foot {
  margin-top: 26px; padding: 26px 30px; border-radius: var(--shape-xl);
  background: var(--md-secondary-container); color: var(--md-on-primary-container);
}
.ai-foot blockquote { margin: 0; font-size: 18px; line-height: 28px; font-weight: 500; }
.ai-foot .who { margin-top: 10px; font-size: 13px; font-weight: 600; opacity: 0.85; }

/* =========================================================
   ROADMAP, FIRST 90 DAYS
   ========================================================= */
.roadmap-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin-top: 44px; }
.rm-card {
  border-radius: var(--shape-xxl); background: var(--md-sc-lowest);
  box-shadow: inset 0 0 0 1px var(--md-outline); padding: 30px;
  display: flex; flex-direction: column; gap: 12px;
}
.rm-card .rm-when { align-self: flex-start; }
.rm-card h3 { font-size: 22px; line-height: 28px; font-weight: 700; letter-spacing: 0; margin: 4px 0 0; }
.rm-card p { font-size: 14px; line-height: 20px; letter-spacing: 0.25px; color: var(--md-on-surface-variant); margin: 0; }
.rm-card .rm-out { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--md-outline-variant); }

/* =========================================================
   CADENCE LOAD LINE
   Five points, one per month, read straight off the pill counts.
   Draws once on scroll, then holds still. No infinite loop.
   ========================================================= */
.load-line { width: 100%; height: 84px; margin-top: 12px; overflow: visible; }
.load-line .axis { stroke: var(--md-outline-variant); stroke-width: 1; }
.load-line .load {
  fill: none; stroke: var(--md-primary); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 900; stroke-dashoffset: 900; /* overwritten with the measured length in initCadence */
  transition: stroke-dashoffset 900ms cubic-bezier(0.05, 0.7, 0.1, 1);
}
.load-line.drawn .load { stroke-dashoffset: 0 !important; }
.load-line .pk { fill: var(--md-primary); opacity: 0; transition: opacity 200ms var(--emphasized); }
.load-line .pk.peak { fill: var(--md-tertiary); }
.load-line.drawn .pk { opacity: 1; transition-delay: 700ms; }

/* =========================================================
   INFOGRAPHIC: BOTH CHAIRS
   ========================================================= */
.chairs-toggle { margin: 40px 0 26px; }
.chairs-stage { position: relative; }
.chairs-panel { display: none; }
.chairs-panel.active { display: grid; animation: sharedAxis 500ms var(--emphasized); }
@keyframes sharedAxis {
  from { opacity: 0; transform: translateX(var(--ax, 40px)); }
  to { opacity: 1; transform: none; }
}
.chairs-panel { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.chair-card { background: var(--md-sc-lowest); border-radius: var(--shape-lg-inc); padding: 22px; box-shadow: inset 0 0 0 1px var(--md-outline-variant); }
.chair-card .t { font-weight: 700; font-size: 15px; margin: 0 0 6px; }
.chair-card p { margin: 0; color: var(--md-on-surface-variant); font-size: 14px; line-height: 21px; }
.testimonials { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 26px; }
.quote-card { background: var(--md-secondary-container); color: var(--md-on-secondary-container); border-radius: var(--shape-xl); padding: 24px; }
.quote-card blockquote { margin: 0 0 14px; font-size: 15px; line-height: 23px; font-weight: 500; }
.quote-card .who { font-size: 12.5px; opacity: 0.85; }

/* =========================================================
   INFOGRAPHIC: CADENCE / CAPACITY
   ========================================================= */
.cadence-strip { position: relative; margin-top: 10px; }
.cadence-months { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.cadence-month { text-align: center; }
.cadence-month .m-lbl { font-size: 12px; font-weight: 700; letter-spacing: 0.6px; color: var(--md-caption); text-transform: uppercase; margin-bottom: 10px; }
.cadence-cell { min-height: 120px; border-radius: var(--shape-lg); background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline-variant); padding: 10px 8px; display: flex; flex-direction: column; gap: 6px; }
.launch-pill {
  border-radius: var(--shape-full); padding: 5px 10px; font-size: 11px; font-weight: 700;
  background: var(--md-primary); color: var(--md-on-primary); cursor: default;
  opacity: 0; transform: translateY(-14px);
  transition: opacity var(--effects-fast), transform var(--spring-fast);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.launch-pill.event { background: var(--md-tertiary-container); color: var(--md-on-tertiary-container); }
.launch-pill.in { opacity: 1; transform: none; }
.launch-pill:hover { transform: translateY(-2px); }

/* =========================================================
   CHANGELOG
   ========================================================= */
.changelog { position: relative; margin-top: 48px; display: grid; gap: 14px; }
.log-item {
  background: var(--md-sc-low); border-radius: var(--shape-lg-inc);
  overflow: hidden; transition: background var(--effects-default);
}
.log-item[open], .log-item.open { background: var(--md-sc); }
.log-head {
  display: flex; align-items: center; gap: 16px; padding: 20px 24px; cursor: pointer;
  flex-wrap: wrap; border: none; width: 100%; background: transparent; text-align: left;
  font-family: var(--font-brand); color: var(--md-on-surface);
}
.log-head .v {
  font-family: var(--font-code); font-weight: 700; font-size: 14px;
  background: var(--md-primary-container); color: var(--md-on-primary-container);
  border-radius: var(--shape-full); padding: 5px 13px;
}
.log-item.current .log-head .v { background: var(--md-primary); color: var(--md-on-primary); }
.log-head .t { font-weight: 600; font-size: 16.5px; flex: 1; min-width: 200px; }
.log-head .yr { font-family: var(--font-code); color: var(--md-caption); font-size: 13px; }
.log-head .caret { transition: transform var(--spring-default); color: var(--md-on-surface-variant); }
.log-item.open .log-head .caret { transform: rotate(180deg); }
.log-body { max-height: 0; overflow: hidden; transition: max-height 500ms var(--emphasized); }
.log-body-inner { padding: 0 24px 24px; }
.log-body p { margin: 0 0 14px; color: var(--md-on-surface-variant); font-size: 14.5px; line-height: 22px; max-width: 720px; }
.log-chips { display: flex; gap: 8px; flex-wrap: wrap; }

/* =========================================================
   KNOWN ISSUES
   ========================================================= */
.issues-card {
  margin-top: 44px; border-radius: var(--shape-xl-inc);
  background: var(--md-sc-lowest); box-shadow: inset 0 0 0 1px var(--md-outline-variant);
  overflow: hidden;
}
.issues-row { padding: 26px 30px; display: grid; grid-template-columns: 130px 1fr; gap: 20px; border-bottom: 1px solid var(--md-outline-variant); }
.issues-row:last-child { border-bottom: none; }
.issues-row .tag { font-family: var(--font-code); font-size: 12px; font-weight: 700; letter-spacing: 0.6px; }
.issues-row .tag.open-issue { color: var(--md-error); }
.issues-row .tag.path { color: var(--md-primary); }
.issues-row p { margin: 0; font-size: 15.5px; line-height: 24px; max-width: 720px; }
.issues-row.migration { background: var(--md-sc-low); }

/* =========================================================
   CONTACT + FAB
   ========================================================= */
.contact { text-align: center; padding: 110px 0 130px; }
.contact h2 { margin: 0 0 14px; }
.contact .lede { color: var(--md-on-surface-variant); max-width: 520px; margin: 0 auto 36px; }
.contact-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.fab-wrap { position: fixed; right: 24px; bottom: 24px; z-index: 60; display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
.fab-item {
  display: flex; align-items: center; gap: 10px; text-decoration: none;
  height: 52px; padding: 0 22px; border-radius: var(--shape-full);
  background: var(--md-sc-highest); color: var(--md-on-surface);
  font-weight: 600; font-size: 14px; box-shadow: 0 4px 16px rgba(29, 27, 32, 0.18);
  opacity: 0; transform: translateY(14px) scale(0.9); pointer-events: none;
  transition: opacity var(--effects-fast), transform var(--spring-fast);
}
.fab-wrap.open .fab-item { opacity: 1; transform: none; pointer-events: auto; }
.fab-wrap.open .fab-item:nth-child(1) { transition-delay: 90ms; }
.fab-wrap.open .fab-item:nth-child(2) { transition-delay: 60ms; }
.fab-wrap.open .fab-item:nth-child(3) { transition-delay: 30ms; }
.fab {
  width: 60px; height: 60px; border: none; cursor: pointer;
  border-radius: var(--shape-lg); background: var(--md-primary); color: var(--md-on-primary);
  font-size: 22px; box-shadow: 0 6px 20px rgba(103, 80, 164, 0.4);
  transition: border-radius var(--spring-default), transform var(--spring-fast), background var(--effects-default);
  display: flex; align-items: center; justify-content: center;
}
.fab:hover { transform: scale(1.05); }
.fab-wrap.open .fab { border-radius: 50%; background: var(--md-inverse-surface); color: var(--md-inverse-on-surface); }
.fab svg { transition: transform var(--spring-default); }
.fab-wrap.open .fab svg { transform: rotate(135deg); }

/* =========================================================
   FOOTER
   ========================================================= */
footer { padding: 44px 0 60px; border-top: 1px solid var(--md-outline-variant); }
footer .foot-grid { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; align-items: center; }
footer .disclaimer { color: var(--md-caption); font-size: 12.5px; line-height: 18px; max-width: 460px; }
footer .foot-links { display: flex; gap: 18px; }
footer .foot-links a { color: var(--md-primary); text-decoration: none; font-weight: 600; font-size: 13.5px; }
footer .foot-links a:hover { text-decoration: underline; }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
  .migration-grid { grid-template-columns: 1fr; }
  .mig-arrow { transform: rotate(90deg); margin: 4px auto; }
  .relay-body { grid-template-columns: 1fr; }
  .inspector { position: static; }
  .rail { grid-template-columns: repeat(3, 1fr); border-radius: var(--shape-xl); }
  .rail-node:nth-child(n+4) { box-shadow: inset 0 1px 0 0 var(--md-outline-variant); }
  .rank-list li { grid-template-columns: 1fr; gap: 6px; }
  .rank-list .lane { justify-self: start; }
  .issues-row { grid-template-columns: 1fr; gap: 8px; }
  .tl-lane { grid-template-columns: 86px 1fr; }
  .tl-lane .lbl { font-size: 11px; }
  section { padding: 64px 0; }
  .cadence-months { grid-template-columns: repeat(5, minmax(90px, 1fr)); }
  .cadence-strip { overflow-x: auto; padding-bottom: 8px; }
}
@media (max-width: 560px) {
  .spec-table thead { display: none; }
  .spec-table, .spec-table tbody, .spec-table tr, .spec-table td { display: block; width: 100%; }
  .spec-table tbody tr td:first-child, .spec-table tbody tr td:last-child { border-radius: 0; width: 100%; }
  .spec-table tbody tr { border-radius: var(--shape-lg); overflow: hidden; margin-bottom: 10px; }
  .spec-num { display: none; }
  .spec-table td { padding: 14px 18px; }
  .spec-table tbody tr td:first-child { padding-bottom: 0; }
}

/* =========================================================
   REDUCED MOTION
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 1ms !important; animation-duration: 1ms !important;
    transition-delay: 0ms !important; animation-iteration-count: 1 !important;
  }
  .reveal { opacity: 1; transform: none; }
  .launch-pill { opacity: 1; transform: none; }
  .load-line .load { transition: none; stroke-dashoffset: 0 !important; }
  .load-line .pk { transition: none; opacity: 1; }
  .rstage.active { animation: none; }
  .bar-fill { transition: none; }
}