/* ============================================================
   YIERSA × OPENCODE — BUILD LOG
   Pure static. No external fonts, no CDN, no build step.
   ============================================================ */

:root {
  --paper: #f3efe5;
  --paper-2: #e9e3d4;
  --paper-3: #dfd7c5;
  --white: #fffdf8;
  --ink: #17211b;
  --ink-2: #2d3b32;
  --ink-3: #4d5d52;
  --muted: #5b6a5f;
  --muted-2: #647166;
  --line: rgba(23, 33, 27, 0.14);
  --line-soft: rgba(23, 33, 27, 0.08);
  --line-strong: rgba(23, 33, 27, 0.24);
  --green: #2dac38;
  --green-deep: #167a2a;
  --green-soft: #dfeedd;
  --green-wash: rgba(45, 172, 56, 0.08);
  --amber: #b7791f;
  --amber-soft: #f3e5c9;
  --red: #b3382c;
  --red-soft: #f1ddd8;
  --dark: #141b17;
  --dark-2: #1c2721;
  --dark-line: rgba(243, 239, 229, 0.13);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC",
    "SimSun", serif;
  --mono: "SF Mono", ui-monospace, "Cascadia Code", "Roboto Mono", Menlo,
    Consolas, monospace;

  --wrap: 1160px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow: 0 1px 2px rgba(23, 33, 27, 0.04), 0 18px 48px rgba(23, 33, 27, 0.07);
  --shadow-lg: 0 2px 4px rgba(23, 33, 27, 0.05), 0 32px 80px rgba(23, 33, 27, 0.1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(23, 33, 27, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 33, 27, 0.022) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.mode-evidence {
  --paper: #f0ecdf;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: rgba(23, 33, 27, 0.06);
  padding: 0.12em 0.36em;
  border-radius: 4px;
}

::selection {
  background: var(--green);
  color: #fff;
}

.wrap {
  width: min(var(--wrap), calc(100% - 56px));
  margin-inline: auto;
}

/* ---------- progress ---------- */
.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 120;
  pointer-events: none;
}

.progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--green);
  transition: width 0.1s linear;
}

/* ---------- topbar ---------- */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 28px;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease),
    backdrop-filter 0.25s var(--ease);
  border-bottom: 1px solid transparent;
}

.topbar.is-scrolled {
  background: rgba(243, 239, 229, 0.9);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom-color: var(--line);
}

body.mode-evidence .topbar.is-scrolled {
  background: rgba(240, 236, 223, 0.92);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.topbar__brand img {
  width: 120px;
  height: auto;
}

.topbar__divider {
  width: 1px;
  height: 16px;
  background: var(--line-strong);
}

.topbar__label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--muted);
  white-space: nowrap;
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 12px;
  color: var(--ink-3);
}

.topbar__nav a {
  position: relative;
  padding: 4px 0;
  white-space: nowrap;
}

.topbar__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s var(--ease);
}

.topbar__nav a:hover {
  color: var(--green-deep);
}

.topbar__nav a:hover::after {
  transform: scaleX(1);
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink-3);
  padding: 6px 10px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.mode-toggle:hover {
  border-color: var(--green);
  color: var(--green-deep);
}

.mode-toggle__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

body.mode-evidence .mode-toggle {
  background: var(--green-wash);
  border-color: rgba(45, 172, 56, 0.45);
  color: var(--green-deep);
}

.topbar__menu {
  display: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 11px;
  cursor: pointer;
}

.mobile-nav {
  position: fixed;
  z-index: 99;
  top: 62px;
  left: 16px;
  right: 16px;
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  padding: 8px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
}

.mobile-nav.is-open {
  display: grid;
}

.mobile-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--ink-2);
}

.mobile-nav a:hover {
  background: var(--green-wash);
  color: var(--green-deep);
}

/* ---------- shared type ---------- */
.kicker {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green-deep);
}

.lede {
  max-width: 720px;
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.75;
  color: var(--muted);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(38px, 5.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.section {
  position: relative;
  padding: 112px 0;
}

.section__head {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 28px;
  margin-bottom: 56px;
}

.section__no {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--green-deep);
  letter-spacing: 0.04em;
}

.section--intro {
  padding-top: 96px;
}

.section--method {
  background: rgba(255, 253, 248, 0.45);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 126px 0 64px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  right: -160px;
  top: 8%;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 172, 56, 0.12), transparent 68%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  left: -120px;
  bottom: -140px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(183, 121, 31, 0.08), transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 56px;
}

.hero__top .kicker {
  margin: 0;
}

.hero__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.hero__status span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(45, 172, 56, 0.12);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: center;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(64px, 10.4vw, 158px);
  line-height: 0.9;
  letter-spacing: -0.055em;
  font-weight: 600;
}

.hero h1 em {
  font-style: normal;
  color: var(--green-deep);
  position: relative;
}

.hero h1 em::after {
  content: "";
  position: absolute;
  left: 0.06em;
  right: 0.02em;
  bottom: 0.04em;
  height: 0.06em;
  background: var(--green);
  opacity: 0.4;
}

.hero__sub {
  margin: 32px 0 0;
  font-size: clamp(19px, 2.1vw, 28px);
  line-height: 1.55;
  color: var(--ink-2);
}

.hero__note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--green);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 13px;
  color: var(--ink-2);
  transition: border-color 0.2s, color 0.2s;
}

.hero__cta span {
  color: var(--green-deep);
  transition: transform 0.2s var(--ease);
}

.hero__cta:hover {
  border-color: var(--green);
  color: var(--green-deep);
}

.hero__cta:hover span {
  transform: translateY(4px);
}

/* hero receipt */
.hero__receipt {
  position: relative;
  justify-self: end;
  width: min(380px, 100%);
  padding: 22px 24px 42px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  transform: rotate(-1.2deg);
}

.hero__receipt::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -7px;
  height: 7px;
  background: repeating-linear-gradient(
    90deg,
    transparent 0 6px,
    var(--paper) 6px 8px
  );
}

.hero__receipt .receipt__rows {
  margin: 16px 0;
}

.hero__receipt .stamp {
  bottom: -10px;
  right: 18px;
}

.hero__fineprint {
  max-width: 680px;
  margin: 40px 0 0;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.7;
  color: var(--muted-2);
}

.hero__scroll {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 56px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--muted-2);
}

.hero__scroll i {
  display: block;
  width: 56px;
  height: 1px;
  background: var(--line-strong);
  position: relative;
}

.hero__scroll i::after {
  content: "";
  position: absolute;
  right: 0;
  top: -2px;
  width: 5px;
  height: 5px;
  border-right: 1px solid var(--muted);
  border-bottom: 1px solid var(--muted);
  transform: rotate(-45deg);
}

/* ---------- receipt ---------- */
.receipt {
  position: relative;
  padding: 20px 22px 22px;
  background: var(--white);
  border: 1px dashed var(--line-strong);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-2);
}

body.mode-evidence .receipt {
  border-color: rgba(45, 172, 56, 0.55);
  box-shadow: 0 0 0 3px var(--green-wash);
}

.receipt__head,
.receipt__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.receipt__head {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.receipt__foot {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.receipt__foot strong {
  color: var(--green-deep);
  letter-spacing: 0.08em;
}

.receipt__rows {
  padding: 6px 0;
}

.receipt__row,
.receipt__rows > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 5px 0;
  border-bottom: 1px dotted var(--line-soft);
}

.receipt__rows > div:last-child {
  border-bottom: 0;
}

.receipt__rows > div > span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.receipt__rows > div > b {
  font-weight: 600;
  text-align: right;
  overflow-wrap: anywhere;
}

.receipt__rows > div > b.is-yellow {
  color: var(--amber);
}

.ev-only {
  display: none !important;
}

body.mode-evidence .ev-only {
  display: flex !important;
}

.stamp {
  position: absolute;
  right: 16px;
  bottom: 16px;
  padding: 5px 9px;
  border: 2px solid var(--green);
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  transform: rotate(-7deg);
  opacity: 0.72;
  pointer-events: none;
}

.receipt--stamped {
  padding-bottom: 46px;
}

.receipt--stamped .stamp {
  bottom: 10px;
  right: 18px;
}

.receipt-block {
  margin: 36px 0;
}

.receipt-block__note {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.receipt-block__note a {
  color: var(--green-deep);
  border-bottom: 1px solid rgba(45, 172, 56, 0.35);
}

.lesson {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

.lesson span {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--green-deep);
}

/* ---------- intro ---------- */
.intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: start;
}

.intro__text p {
  max-width: 640px;
  margin: 0 0 18px;
  color: var(--ink-3);
}

.bigquote {
  max-width: 640px;
  margin: 24px 0 28px;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--green);
  font-family: var(--serif);
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: 1.6;
  color: var(--ink);
}

.intro__truth {
  margin-top: 28px !important;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 16px !important;
  color: var(--ink-2) !important;
}

.compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: stretch;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.compare__col {
  padding: 4px;
}

.compare__col--after {
  padding: 18px;
  background: var(--green-soft);
  border-radius: 12px;
}

.compare__label {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.compare__col--after .compare__label {
  color: var(--green-deep);
}

.compare ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.compare li {
  position: relative;
  padding: 5px 0 5px 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-2);
}

.compare li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--muted-2);
}

.compare__col--after li::before {
  content: "✓";
  color: var(--green-deep);
}

.compare__arrow {
  display: grid;
  place-items: center;
  font-size: 18px;
  color: var(--green-deep);
}

/* ---------- method ---------- */
.loop {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.loop__item {
  padding: 26px 20px 24px;
  border-right: 1px solid var(--line);
}

.loop__item:last-child {
  border-right: 0;
}

.loop__no {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--green-deep);
}

.loop h3 {
  margin: 10px 0 8px;
  font-family: var(--serif);
  font-size: 24px;
  letter-spacing: -0.02em;
}

.loop p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.loop__proof {
  display: block;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.5;
  color: var(--muted-2);
}

.loop__note {
  margin: 24px 0 0;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted-2);
}

.loop__note--second {
  margin-top: 10px;
  max-width: 760px;
  font-family: var(--font);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- case ---------- */
.section--case-alt {
  background: rgba(255, 253, 248, 0.4);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.case__grid {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: clamp(36px, 6vw, 76px);
  align-items: start;
}

.case__rail {
  position: sticky;
  top: 104px;
  align-self: start;
}

.case__no {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--green-deep);
}

.case__date {
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted-2);
}

.case__rail h2 {
  font-size: clamp(34px, 4vw, 48px);
}

.case__sub {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
}

.case__meta {
  margin: 28px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
}

.case__meta div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 0;
}

.case__meta dt {
  font-size: 11px;
  color: var(--muted-2);
}

.case__meta dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-2);
  text-align: right;
}

.case__body {
  min-width: 0;
  max-width: 760px;
}

.case__prose {
  margin: 30px 0;
}

.case__prose p {
  margin: 0 0 14px;
  color: var(--ink-3);
}

.case__rule {
  margin: 36px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 16px;
  color: var(--ink-2);
}

/* prompt */
.prompt {
  position: relative;
  padding: 24px 28px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 0 16px 16px 0;
  box-shadow: var(--shadow);
}

.prompt__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.prompt__text {
  margin: 18px 0 14px;
  font-family: var(--serif);
  font-size: clamp(19px, 2.1vw, 23px);
  line-height: 1.65;
  color: var(--ink);
}

.prompt__follow {
  margin: 12px 0 18px;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-3);
}

.prompt__more {
  margin: 8px 0 14px;
}

.prompt__more summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--green-deep);
}

.prompt__more p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.copy {
  padding: 5px 9px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.copy:hover,
.copy.is-copied {
  border-color: var(--green);
  background: var(--green-wash);
  color: var(--green-deep);
}

/* versions */
.versions {
  margin: 34px 0;
  border-top: 1px solid var(--line);
}

.versions__head,
.versions__row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 190px;
  gap: 16px;
  align-items: baseline;
}

.versions__head {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.versions__row {
  padding: 13px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.versions__row b {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--green-deep);
}

.versions__row p {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-2);
}

.versions__row small {
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
}

/* branches */
.branches__label,
.constraints__label {
  margin: 34px 0 10px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--green-deep);
}

.branches {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 34px;
}

.branch {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--muted-2);
  border-radius: 0 0 12px 12px;
}

.branch--chosen {
  border-top-color: var(--green);
}

.branch--rejected {
  border-top-color: var(--red);
}

.branch--revised {
  border-top-color: var(--amber);
}

.branch__tag {
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: var(--paper);
  border: 1px solid var(--line);
}

.branch--chosen .branch__tag {
  color: var(--green-deep);
  background: var(--green-soft);
  border-color: transparent;
}

.branch--rejected .branch__tag {
  color: var(--red);
  background: var(--red-soft);
  border-color: transparent;
}

.branch--revised .branch__tag {
  color: var(--amber);
  background: var(--amber-soft);
  border-color: transparent;
}

.branch h4 {
  margin: 12px 0 7px;
  font-size: 15px;
  line-height: 1.45;
}

.branch p {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.branch__proof {
  display: block;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.5;
  color: var(--muted-2);
}

/* ---------- multi demo ---------- */
.demo {
  margin: 40px 0;
}

.demo__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.demo__label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--green-deep);
}

.demo__hint {
  font-size: 11px;
  color: var(--muted);
  text-align: right;
}

.demo__stage {
  display: grid;
  grid-template-columns: minmax(0, 330px) minmax(0, 1fr);
  gap: 30px;
  align-items: start;
  margin-top: 22px;
}

.demo__phone {
  padding: 8px;
  background: #101510;
  border-radius: 34px;
  box-shadow: var(--shadow-lg);
}

.demo__canvas {
  position: relative;
  overflow: hidden;
  border-radius: 26px;
  background: #fff;
}

.demo__canvas > img {
  width: 100%;
  height: auto;
}

.bbox {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: var(--w);
  height: var(--h);
  z-index: 3;
  padding: 0;
  border: 0;
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.bbox::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 10px;
  background: transparent;
  transition: background 0.2s var(--ease);
}

.bbox[aria-pressed="false"]::before {
  background: rgba(15, 20, 17, 0.62);
}

.bbox__state {
  position: absolute;
  top: 5px;
  right: 5px;
  z-index: 4;
  display: grid;
  place-items: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.24);
}

.bbox[aria-pressed="true"] .bbox__state::before {
  content: "✓";
}

.bbox[aria-pressed="false"] .bbox__state {
  background: #606a62;
}

.bbox[aria-pressed="false"] .bbox__state::before {
  content: "×";
}

.bbox:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.bbox--manual {
  border: 2px dashed var(--amber);
  background: rgba(183, 121, 31, 0.12);
}

.bbox--manual .bbox__state {
  background: var(--amber);
}

.draw-layer {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: none;
  cursor: crosshair;
  touch-action: none;
  background: rgba(45, 172, 56, 0.04);
}

.demo.is-drawing .draw-layer {
  display: block;
}

.draw-preview {
  position: absolute;
  z-index: 7;
  display: none;
  border: 2px dashed var(--amber);
  background: rgba(183, 121, 31, 0.18);
  border-radius: 6px;
  pointer-events: none;
}

.demo.is-drawing .draw-preview.is-active {
  display: block;
}

.demo__panel {
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.demo__count {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}

.demo__count strong {
  font-family: var(--serif);
  font-size: 48px;
  line-height: 1;
  color: var(--green-deep);
  letter-spacing: -0.04em;
}

.demo__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.demo__list li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr) auto;
  gap: 9px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 13px;
  transition: opacity 0.2s, color 0.2s;
}

.demo__list li.is-off {
  opacity: 0.36;
  text-decoration: line-through;
}

.demo__num {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 9px;
}

.demo__list li.is-off .demo__num {
  background: var(--paper-3);
  color: var(--muted);
}

.demo__name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.demo__list b {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--muted);
}

.demo__total {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}

.demo__total strong {
  margin-left: auto;
  font-family: var(--serif);
  font-size: 24px;
  color: var(--ink);
}

.demo__total em {
  font-family: var(--mono);
  font-size: 9px;
  font-style: normal;
  color: var(--amber);
}

.demo__actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.btn {
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--paper);
  color: var(--ink-2);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.btn:hover {
  border-color: var(--green);
  color: var(--green-deep);
}

.btn--green {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.btn--green:hover {
  background: var(--green-deep);
  border-color: var(--green-deep);
  color: #fff;
}

.demo__note {
  margin: 12px 0 0;
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.5;
  color: var(--muted-2);
}

/* ---------- callout + measurement ---------- */
.callout {
  margin: 28px 0;
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: 0 12px 12px 0;
  box-shadow: var(--shadow);
}

.callout p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-3);
}

.callout strong {
  color: var(--ink);
}

.callout b {
  color: var(--amber);
}

.measure {
  margin: 34px 0;
  border-top: 1px solid var(--line);
}

.measure__head,
.measure__row {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 54px;
  gap: 16px;
  align-items: baseline;
}

.measure__head {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.measure__row {
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 13px;
}

.measure__row span {
  color: var(--ink-3);
}

.measure__row b {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--ink-2);
}

.measure__row em {
  font-family: var(--mono);
  font-size: 10px;
  font-style: normal;
  text-align: right;
  color: var(--muted);
}

.measure__row--good em {
  color: var(--green-deep);
}

.measure__row--mid em {
  color: var(--amber);
}

.measure__row--bad em,
.measure__row--bad b {
  color: var(--red);
}

/* ---------- barcode demo ---------- */
.barcode-demo {
  margin: 40px 0;
}

.barcode-demo__tabs {
  display: inline-flex;
  gap: 3px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
}

.barcode-demo__tabs button {
  padding: 7px 16px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
}

.barcode-demo__tabs button.is-active {
  background: var(--ink);
  color: var(--paper);
}

.barcode-demo__stage {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 28px;
  align-items: start;
  margin-top: 18px;
}

.barcode-demo__panel img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.barcode-demo__caption {
  margin: 8px 0 0;
  font-size: 11px;
  color: var(--muted);
}

.barcode-demo__results {
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.result[hidden] {
  display: none !important;
}

.result {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.result__ok,
.result__warn {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  color: #fff;
}

.result__ok {
  background: var(--green);
}

.result__warn {
  background: var(--amber);
}

.result b {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.result small {
  display: block;
  margin-top: 2px;
  font-size: 10px;
  line-height: 1.5;
  color: var(--muted);
}

.barcode-demo__rule {
  margin: 16px 0 0;
  padding: 10px 12px;
  background: var(--paper);
  border-radius: 8px;
  font-size: 11px;
  line-height: 1.6;
  color: var(--ink-3);
}

/* ---------- face demo ---------- */
.constraints {
  margin: 0 0 34px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.constraints li {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 22px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.constraints b {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-2);
}

.constraints span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.face-demo {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 30px;
  align-items: start;
  margin: 38px 0;
}

.segmented {
  display: inline-flex;
  gap: 2px;
  margin-bottom: 10px;
  padding: 3px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.segmented button {
  padding: 6px 13px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
}

.segmented button.is-active {
  background: var(--ink);
  color: var(--paper);
}

.face-demo__screen img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.face-demo__caption {
  margin: 8px 0 0;
  font-size: 11px;
  color: var(--muted);
}

.flow {
  display: grid;
  gap: 6px;
  padding: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.flow__step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  background: var(--paper);
  border-radius: 9px;
}

.flow__step span {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--green-deep);
}

.flow__step p {
  margin: 0;
  font-size: 12px;
  color: var(--ink-2);
}

.flow__step--ok {
  background: var(--green-soft);
}

.flow__arrow {
  text-align: center;
  font-size: 11px;
  line-height: 1;
  color: var(--muted-2);
}

.scores {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 16px;
}

.scores span {
  padding: 5px 9px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--green-deep);
}

.scores small {
  flex: 1 0 100%;
  font-size: 10px;
  color: var(--muted-2);
}

/* ---------- incidents ---------- */
.section--incidents {
  background: var(--paper-2);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.incident-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.incident {
  padding: 22px 24px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 4px solid var(--red);
  border-radius: 0 0 14px 14px;
}

.incident__top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.incident__top span:last-child {
  color: var(--muted-2);
}

.incident h3 {
  margin: 12px 0 6px;
  font-family: var(--serif);
  font-size: 25px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.incident__symptom {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--ink-3);
}

.incident dl {
  margin: 0;
}

.incident dl div {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  padding: 7px 0;
  border-top: 1px dashed var(--line-soft);
}

.incident dt {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--muted-2);
}

.incident dd {
  margin: 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-3);
}

.incident__rule {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  font-weight: 600;
  color: var(--red);
}

/* ---------- prompts ---------- */
.section--prompts {
  background: var(--dark);
  color: var(--paper);
  background-image:
    radial-gradient(circle at 15% 15%, rgba(45, 172, 56, 0.12), transparent 30%),
    radial-gradient(circle at 88% 80%, rgba(183, 121, 31, 0.08), transparent 32%);
}

.section--prompts .kicker {
  color: #8fdc9a;
}

.section--prompts h2 {
  color: var(--paper);
}

.section--prompts .lede {
  color: #aebbb1;
}

.section--prompts .section__no {
  border-color: rgba(243, 239, 229, 0.24);
  color: #8fdc9a;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0 0 24px;
}

.chip {
  padding: 6px 10px;
  border: 1px solid rgba(243, 239, 229, 0.2);
  border-radius: 999px;
  background: transparent;
  color: #aebbb1;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.chip span {
  opacity: 0.55;
}

.chip:hover,
.chip.is-active {
  border-color: #8fdc9a;
  background: rgba(45, 172, 56, 0.14);
  color: #d9f3dc;
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.prompt-card {
  padding: 22px 24px 20px;
  background: var(--dark-2);
  border: 1px solid var(--dark-line);
  border-radius: 14px;
  transition: border-color 0.2s, transform 0.2s var(--ease);
}

.prompt-card:hover {
  border-color: rgba(143, 220, 154, 0.45);
  transform: translateY(-2px);
}

.prompt-card[hidden] {
  display: none;
}

.prompt-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: #8fdc9a;
}

.prompt-card__meta span {
  color: #7d8b81;
}

.prompt-card blockquote {
  margin: 14px 0 12px;
  font-family: var(--serif);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.65;
  color: #f3efe5;
}

.prompt-card p {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: #a5b2a8;
}

.prompt-card p code {
  background: rgba(243, 239, 229, 0.08);
  color: #d9f3dc;
}

.filters__count {
  margin: 18px 0 0;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: #7d8b81;
}

/* ---------- delivery ---------- */
.delivery-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.delivery__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 25px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot--green {
  background: var(--green);
}

.dot--yellow {
  background: var(--amber);
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.checklist li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.checklist b {
  font-size: 12px;
  color: var(--ink-2);
}

.checklist span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.checklist--yellow b {
  color: var(--amber);
}

.delivery__note {
  margin: 16px 0 0;
  font-size: 12px;
  color: var(--muted-2);
}

.release-table {
  margin-top: 44px;
  border-top: 1px solid var(--line);
}

.release-table__head,
.release-table__row {
  display: grid;
  grid-template-columns: 66px 62px minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 14px;
  align-items: baseline;
}

.release-table__head {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.release-table__row {
  padding: 13px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.release-table__row b {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--green-deep);
}

.release-table__row span {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
}

.release-table__row p {
  margin: 0;
  font-size: 13px;
  color: var(--ink-2);
}

.release-table__row small {
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.6;
  color: var(--muted);
}

.sample {
  max-width: 560px;
  margin-top: 36px;
  transform: rotate(-0.5deg);
}

.receipt__quote {
  max-width: 740px;
  margin: 64px auto 0;
  font-family: var(--serif);
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.5;
  text-align: center;
  color: var(--ink);
}

/* ---------- timeline ---------- */
.section--timeline {
  background: rgba(255, 253, 248, 0.45);
  border-top: 1px solid var(--line-soft);
}

.timeline {
  margin: 8px 0 0 42px;
  border-left: 1px solid var(--line);
}

.timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 26px;
  padding: 16px 0 20px 30px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--paper);
}

.timeline__item time {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--green-deep);
}

.timeline__item h3 {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.timeline__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- closing ---------- */
.section--closing {
  padding-bottom: 80px;
}

.rules {
  max-width: 840px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.rules li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 20px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}

.rules span {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--green-deep);
}

.rules p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-3);
}

.rules b {
  color: var(--ink);
}

.closing__quote {
  max-width: 820px;
  margin: 72px auto;
  font-family: var(--serif);
  font-size: clamp(34px, 5.6vw, 64px);
  line-height: 1.25;
  letter-spacing: -0.03em;
  text-align: center;
  color: var(--ink);
}

.appendix {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.appendix summary {
  padding: 16px 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--green-deep);
}

.appendix summary span {
  color: var(--muted-2);
}

.appendix__table {
  padding: 4px 0 18px;
}

.appendix__head,
.appendix__table > div {
  display: grid;
  grid-template-columns: 64px minmax(0, 1.4fr) minmax(0, 0.6fr);
  gap: 18px;
  align-items: baseline;
}

.appendix__head {
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.appendix__table > div:not(.appendix__head) {
  padding: 8px 0;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 12px;
  color: var(--ink-3);
}

.appendix__table time {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
}

/* ---------- footer ---------- */
.footer {
  padding: 40px 0;
  background: var(--dark);
  color: var(--paper);
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 40px;
  align-items: start;
}

.footer__brand img {
  width: 150px;
  height: auto;
  margin-bottom: 14px;
}

.footer__brand p {
  margin: 0;
  font-family: var(--serif);
  font-size: 17px;
  color: #d9d4c7;
}

.footer__meta p {
  margin: 0 0 8px;
  font-size: 10px;
  line-height: 1.7;
  color: #8f9c92;
}

.footer__meta code {
  background: rgba(243, 239, 229, 0.08);
  color: #c8d4ca;
}

.footer__meta a {
  border-bottom: 1px solid rgba(243, 239, 229, 0.25);
}

.footer__meta a:hover {
  color: #fff;
}

/* ---------- reveal ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.js .reveal.in {
  opacity: 1;
  transform: none;
}

/* Align section content with the heading column on wide screens.
   The number stays in the left gutter. */
@media (min-width: 901px) {
  .section:not(.section--case) .section__head ~ * {
    margin-left: 100px;
  }
}

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .topbar__nav {
    gap: 12px;
    font-size: 11px;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr) 340px;
  }

  .loop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .loop__item:nth-child(3) {
    border-right: 0;
  }

  .loop__item:nth-child(n + 4) {
    border-top: 1px solid var(--line);
  }

  .case__grid {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 36px;
  }
}

@media (max-width: 900px) {
  .topbar {
    padding: 12px 20px;
  }

  .topbar__nav {
    display: none;
  }

  .topbar__menu {
    display: inline-flex;
  }

  .wrap {
    width: min(var(--wrap), calc(100% - 40px));
  }

  .section {
    padding: 80px 0;
  }

  .hero {
    min-height: auto;
    padding: 112px 0 56px;
  }

  .hero__top {
    margin-bottom: 36px;
  }

  .hero__grid {
    grid-template-columns: 1fr;
  }

  .hero__receipt {
    justify-self: start;
    width: min(420px, 100%);
    margin-top: 8px;
    transform: none;
  }

  .hero__fineprint,
  .hero__scroll {
    margin-top: 32px;
  }

  .section__head {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 40px;
  }

  .section__no {
    width: 40px;
    height: 40px;
    font-size: 10px;
  }

  .intro__grid {
    grid-template-columns: 1fr;
  }

  .compare {
    max-width: 560px;
  }

  .loop {
    grid-template-columns: 1fr;
  }

  .loop__item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 20px 4px;
  }

  .loop__item:last-child {
    border-bottom: 0;
  }

  .case__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .case__rail {
    position: static;
  }

  .case__rail h2 {
    font-size: 38px;
  }

  .case__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    margin-top: 16px;
  }

  .case__meta div {
    display: flex;
    gap: 8px;
  }

  .case__body {
    max-width: none;
  }

  .demo__stage,
  .barcode-demo__stage,
  .face-demo {
    grid-template-columns: 1fr;
  }

  .demo__phone {
    width: min(330px, 100%);
    justify-self: center;
  }

  .branches {
    grid-template-columns: 1fr;
  }

  .incident-grid,
  .prompt-grid,
  .delivery-grid {
    grid-template-columns: 1fr;
  }

  .constraints li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .release-table__head,
  .release-table__row {
    grid-template-columns: 54px 54px minmax(0, 1fr);
  }

  .release-table__head span:last-child,
  .release-table__row small {
    display: none;
  }

  .timeline {
    margin-left: 8px;
  }

  .footer__inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
    line-height: 1.72;
  }

  .wrap {
    width: calc(100% - 32px);
  }

  .topbar {
    gap: 12px;
    padding: 10px 16px;
  }

  .topbar__brand img {
    width: 96px;
  }

  .topbar__label,
  .topbar__divider {
    display: none;
  }

  .mode-toggle {
    font-size: 9px;
    padding: 5px 8px;
  }

  .topbar__menu {
    font-size: 10px;
    padding: 5px 8px;
  }

  .hero {
    padding-top: 96px;
  }

  .hero h1 {
    font-size: clamp(58px, 20vw, 96px);
  }

  .hero__sub {
    margin-top: 24px;
    font-size: 19px;
  }


  .hero__note {
    font-size: 12px;
  }

  .hero__status {
    display: none;
  }

  .hero__top .kicker {
    font-size: 9px;
    letter-spacing: 0.14em;
  }

  .hero__receipt {
    padding: 18px;
  }

  .hero__receipt .receipt__rows > div > b {
    font-size: 11px;
  }

  .section {
    padding: 64px 0;
  }

  h2 {
    font-size: clamp(32px, 9vw, 44px);
  }

  .lede {
    font-size: 16px;
  }

  .section__head {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .section__no {
    width: 36px;
    height: 36px;
  }

  .bigquote {
    font-size: 20px;
  }

  .compare {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .compare__arrow {
    transform: rotate(90deg);
  }

  .measure__head {
    display: none;
  }

  .measure__row {
    grid-template-columns: minmax(0, 1fr) 46px;
    gap: 4px 10px;
    padding: 12px 0;
  }

  .measure__row span {
    grid-column: 1;
  }

  .measure__row em {
    grid-column: 2;
    grid-row: 1;
  }

  .measure__row b {
    grid-column: 1 / -1;
    grid-row: 2;
    font-size: 12px;
  }

  .versions__head {
    display: none;
  }

  .versions__row {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 10px;
  }

  .versions__row small {
    grid-column: 2;
    margin-top: -2px;
  }

  .prompt {
    padding: 18px 18px 16px;
  }

  .prompt__text {
    font-size: 18px;
  }

  .prompt__head {
    font-size: 8px;
  }

  .demo__head {
    display: block;
  }

  .demo__hint {
    margin-top: 4px;
    text-align: left;
  }

  .demo__phone {
    border-radius: 28px;
  }

  .demo__canvas {
    border-radius: 21px;
  }

  .demo__panel {
    padding: 16px;
  }

  .demo__count strong {
    font-size: 40px;
  }

  .barcode-demo__results {
    padding: 16px;
  }

  .constraints li {
    padding: 12px 0;
  }

  .face-demo__screen img {
    border-radius: 12px;
  }

  .incident {
    padding: 18px;
  }

  .incident h3 {
    font-size: 22px;
  }

  .prompt-card {
    padding: 18px;
  }

  .prompt-card blockquote {
    font-size: 17px;
  }

  .release-table__head,
  .release-table__row {
    grid-template-columns: 50px 1fr;
    gap: 8px;
  }

  .release-table__head span:nth-child(2),
  .release-table__row > span {
    display: none;
  }

  .release-table__row p {
    grid-column: 2;
  }

  .sample {
    transform: none;
  }

  .receipt {
    padding: 16px;
  }

  .receipt__rows > div {
    gap: 12px;
  }

  .receipt__rows > div > b {
    font-size: 10px;
  }

  .timeline__item {
    grid-template-columns: 1fr;
    gap: 2px;
    padding-left: 20px;
  }

  .timeline__item::before {
    top: 22px;
  }

  .rules li {
    grid-template-columns: 30px 1fr;
    gap: 12px;
  }

  .closing__quote {
    margin: 48px auto;
  }

  .appendix__head,
  .appendix__table > div {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 10px;
  }

  .appendix__head span:last-child,
  .appendix__table > div > span:last-child {
    display: none;
  }

  .footer {
    padding: 32px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- print ---------- */
@media print {
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }

  .topbar,
  .mobile-nav,
  .progress,
  .mode-toggle,
  .hero__scroll,
  .demo__actions,
  .barcode-demo__tabs,
  .filters {
    display: none !important;
  }

  .section {
    padding: 24px 0;
    break-inside: avoid;
  }

  .hero {
    min-height: auto;
    padding: 0 0 24px;
  }

  .hero__receipt {
    transform: none;
    box-shadow: none;
  }

  .section--prompts {
    background: #fff;
    color: #000;
  }

  .section--prompts h2,
  .section--prompts .lede,
  .section--prompts .kicker,
  .prompt-card blockquote,
  .prompt-card p {
    color: #000;
  }

  .prompt-card {
    background: #fff;
    border-color: #ccc;
  }

  .footer {
    background: #fff;
    color: #000;
  }

  .footer__meta p {
    color: #333;
  }

  a {
    text-decoration: underline;
  }
}
/* ---------- 404 ---------- */
.notfound {
  min-height: 100svh;
  display: grid;
  place-items: center;
  text-align: left;
  padding: 96px 0;
}

.notfound h1 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: clamp(52px, 10vw, 124px);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.notfound__sub {
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.notfound__fine {
  margin-top: 56px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--muted-2);
}