:root {
  --site-shell: 1200px;
  --reading-measure: 720px;
  --color-background: #F3F1EA;
  --color-surface: #FCFBF7;
  --color-ink: #18201C;
  --color-muted: #65706A;
  --color-line: #D6D2C8;
  --color-primary: #B96A3C;
  --color-secondary: #47695B;
  --color-deep-blue: #243F50;
  --color-soft-green: #DDE5DE;
  --color-soft-rust: #EBD9CD;
  --color-soft-blue: #DCE4E8;
  --shadow-soft: 0 18px 55px rgba(24, 32, 28, 0.08);
  --radius-card: 18px;
  --radius-control: 8px;
  --touch-target: 44px;
  --font-display: Georgia, "Times New Roman", "Noto Serif TC", "Songti TC", serif;
  --font-body: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

img {
  height: auto;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  transform: translateY(-160%);
  min-height: var(--touch-target);
  padding: 10px 16px;
  border-radius: var(--radius-control);
  background: var(--color-ink);
  color: var(--color-surface);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell,
.case-shell {
  width: min(calc(100% - 48px), var(--site-shell));
  margin-inline: auto;
}

.reading-measure {
  max-width: var(--reading-measure);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(214, 210, 200, 0.82);
  background: rgba(243, 241, 234, 0.94);
  backdrop-filter: blur(16px);
}

.site-header__inner,
.nav.case-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 48px), var(--site-shell));
  min-height: 72px;
  margin-inline: auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: var(--touch-target);
  color: var(--color-ink);
  font-weight: 750;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 18px;
}

.site-nav,
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav a,
.nav-links a {
  min-height: var(--touch-target);
  display: inline-flex;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.nav-links a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-ink);
}

.nav-contact {
  color: var(--color-surface) !important;
  background: var(--color-ink);
  border-radius: 999px;
  padding-inline: 17px;
}

.language-toggle,
.nav-toggle {
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-control);
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
  font-weight: 750;
}

.language-toggle {
  padding-inline: 12px;
}

.nav-toggle {
  display: none;
  width: var(--touch-target);
  padding: 11px;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  background: currentColor;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.eyebrow,
.case-eyebrow {
  margin: 0 0 14px;
  color: var(--color-primary);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  line-height: 1.35;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
.display-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.03;
  text-wrap: balance;
}

h1 {
  font-size: clamp(3.25rem, 5.2vw, 4rem);
}

h2 {
  font-size: clamp(2.25rem, 4vw, 3rem);
}

h3 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.3;
}

html[lang="zh-Hant"] h1,
html[lang="zh-Hant"] .flow-case main h1 {
  max-width: 16em;
  font-size: clamp(2.7rem, 4.6vw, 3.25rem);
  line-height: 1.16;
  letter-spacing: -0.04em;
}

html[lang="zh-Hant"] h2 {
  font-size: clamp(2.15rem, 3.6vw, 2.75rem);
  line-height: 1.18;
}

.hero,
.case-hero {
  padding: clamp(76px, 10vw, 138px) 0 clamp(70px, 9vw, 120px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(340px, 0.78fr);
  align-items: center;
  gap: clamp(48px, 7vw, 92px);
}

.case-hero-grid {
  display: grid;
  align-items: center;
  gap: clamp(48px, 7vw, 92px);
}

.hero-copy,
.case-hero-copy {
  min-width: 0;
}

.hero h1,
.case-hero h1 {
  max-width: 870px;
}

.hero-lead,
.case-lead {
  max-width: 680px;
  margin: 28px 0 0;
  color: var(--color-muted);
  font-size: clamp(1.14rem, 1.7vw, 1.34rem);
  line-height: 1.55;
}

.hero-difference {
  max-width: 620px;
  margin: 20px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--color-primary);
  color: var(--color-ink);
  font-weight: 700;
}

.hero-claim-compact {
  display: none;
}

.hero-claim-detail {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--color-ink);
  font-weight: 700;
}

.hero-claim-detail:empty {
  display: none;
}

html[lang="zh-Hant"] .hero-claim-full {
  display: none;
}

html[lang="zh-Hant"] .hero-claim-compact {
  display: inline;
}

.hero-actions,
.case-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target);
  padding: 12px 18px;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-control);
  background: var(--color-ink);
  color: var(--color-surface);
  font-weight: 800;
  text-decoration: none;
}

.button:hover {
  transform: translateY(-1px);
}

.button-secondary {
  background: transparent;
  color: var(--color-ink);
}

.hero-panel {
  position: relative;
  padding: 34px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 20px 20px auto auto;
  width: 58px;
  height: 58px;
  border: 1px solid var(--color-primary);
  border-radius: 50%;
}

.hero-panel__label {
  max-width: 28ch;
  margin: 0 0 50px;
  color: var(--color-muted);
}

.hero-panel__path {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-panel__path li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 14px;
  align-items: start;
  padding: 13px 0;
  border-top: 1px solid var(--color-line);
}

.hero-panel__path span {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.proof-bar {
  border-block: 1px solid var(--color-line);
  background: rgba(252, 251, 247, 0.62);
}

.proof-bar__grid,
.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.proof-item,
.metric-strip article {
  min-width: 0;
  padding: 26px 26px 28px;
  border-right: 1px solid var(--color-line);
}

.proof-item:first-child,
.metric-strip article:first-child {
  border-left: 1px solid var(--color-line);
}

.proof-item strong,
.metric-strip strong {
  display: block;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 500;
  line-height: 1.1;
}

.proof-item span,
.metric-strip span {
  display: block;
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.site-section,
.case-section {
  padding: clamp(80px, 9vw, 128px) 0;
  border-bottom: 1px solid var(--color-line);
}

.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(320px, 0.5fr);
  justify-content: space-between;
  align-items: end;
  gap: 48px;
  margin-bottom: 52px;
}

.section-intro > p {
  margin: 0;
  color: var(--color-muted);
}

.loop-preview,
.loop-trail {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.loop-phase {
  position: relative;
  min-width: 0;
  padding: 28px 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.loop-phase:nth-child(2) { background: var(--color-soft-blue); }
.loop-phase:nth-child(3) { background: var(--color-soft-rust); }
.loop-phase:nth-child(4) { background: var(--color-soft-green); }

.loop-phase__number {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.loop-phase h3 {
  margin-top: 32px;
}

.loop-phase ol,
.loop-phase ul {
  margin: 20px 0 0;
  padding-left: 18px;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.method-action {
  display: flex;
  justify-content: flex-end;
  margin-top: 26px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  color: var(--color-deep-blue);
  font-weight: 800;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.case-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.case-card__media {
  display: grid;
  aspect-ratio: 16 / 9;
  place-items: center;
  padding: 18px;
  border-bottom: 1px solid var(--color-line);
  background: #111614;
}

.case-card__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hero-art img,
.evidence-frame img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.case-card__body {
  padding: 28px;
}

.case-card__body h3 a {
  text-decoration: none;
}

.case-card__body > p:not(.eyebrow):not(.proof-line) {
  color: var(--color-muted);
}

.proof-line {
  padding-top: 18px;
  border-top: 1px solid var(--color-line);
  color: var(--color-secondary);
  font-size: 0.86rem;
  font-weight: 750;
}

.proof-boundary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.boundary-panel {
  padding: clamp(32px, 5vw, 60px);
  background: var(--color-surface);
}

.boundary-panel + .boundary-panel {
  border-left: 1px solid var(--color-line);
  background: var(--color-deep-blue);
  color: #f8f5ec;
}

.boundary-panel p {
  color: inherit;
  opacity: 0.78;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.note-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 26px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.note-card__index {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 2rem;
}

.note-card h3 {
  margin-top: 18px;
  overflow-wrap: anywhere;
}

.note-card > p:not(.eyebrow) {
  color: var(--color-muted);
}

.note-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}

.note-card__tags span {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--color-soft-rust);
  color: #713e25;
  font-size: 0.72rem;
  font-weight: 800;
}

.note-card__link {
  margin-top: auto;
}

.wechat-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 30px;
  margin-top: 28px;
  padding: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.wechat-panel p {
  margin: 8px 0 0;
  color: var(--color-muted);
}

.collaboration {
  color: #f8f5ec;
  background: var(--color-ink);
}

.collaboration .eyebrow {
  color: #e4a57d;
}

.collaboration-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.52fr);
  align-items: end;
  gap: 60px;
}

.collaboration h2 {
  max-width: 760px;
}

.collaboration p {
  color: #bfc8c2;
}

.collaboration .button {
  border-color: #f8f5ec;
  background: #f8f5ec;
  color: var(--color-ink);
}

.site-footer,
.footer.case-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 44px;
  width: min(calc(100% - 48px), var(--site-shell));
  margin-inline: auto;
  padding: 54px 0;
}

.site-footer__statement,
.footer.case-footer p {
  max-width: 440px;
  margin: 14px 0 0;
  color: var(--color-muted);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, auto);
  align-content: start;
  gap: 8px 28px;
  font-size: 0.86rem;
}

.footer-links a {
  min-height: var(--touch-target);
  display: inline-flex;
  align-items: center;
}

.footer-meta {
  grid-column: 1 / -1;
  color: var(--color-muted);
}

.wechat-dialog {
  width: min(520px, calc(100% - 32px));
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: 0 28px 100px rgba(24, 32, 28, 0.28);
}

.wechat-dialog::backdrop {
  background: rgba(24, 32, 28, 0.62);
}

.wechat-dialog__inner {
  padding: 30px;
}

.dialog-close {
  float: right;
  width: var(--touch-target);
  height: var(--touch-target);
  border: 1px solid var(--color-line);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  font-size: 1.35rem;
}

.wechat-qr {
  display: block;
  width: min(215px, 60vw);
  max-width: 100%;
  height: auto;
  object-fit: contain;
  margin: 26px auto 0;
  image-rendering: pixelated;
}

/* Case template */
.case-hero-grid {
  grid-template-columns: minmax(0, 0.78fr) minmax(440px, 1.22fr);
}

.hero-art,
.evidence-frame {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: #0b0e0d;
}

.hero-art {
  aspect-ratio: 1672 / 941;
  padding: 12px;
}

.case-hero .metric-strip {
  margin-top: 64px;
  border-block: 1px solid var(--color-line);
}

.case-overview-grid,
.case-story-grid,
.proof-grid,
.delivery-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.48fr) minmax(0, 1fr);
  gap: clamp(42px, 8vw, 110px);
}

.case-heading h2,
.delivery-heading h2,
.proof-copy h2 {
  max-width: 10.5em;
}

.case-copy {
  max-width: var(--reading-measure);
  color: var(--color-muted);
}

.case-copy > :first-child {
  margin-top: 0;
}

.case-copy blockquote {
  margin: 34px 0 0;
  padding: 22px 0 22px 24px;
  border-left: 3px solid var(--color-primary);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 1.55rem;
  line-height: 1.35;
}

.snapshot-grid,
.capability-grid,
.principle-grid,
.boundary-grid,
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.snapshot-card,
.capability-card,
.principle-card,
.boundary-card,
.evidence-card {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.snapshot-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
}

.snapshot-card span,
.capability-card p,
.principle-card p,
.boundary-card p,
.evidence-card p {
  color: var(--color-muted);
}

.capability-card__index,
.principle-card__index,
.boundary-card__index {
  display: inline-flex;
  margin-bottom: 30px;
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.section-tinted {
  background: var(--color-surface);
}

.architecture-art {
  margin-top: 44px;
  padding: 12px;
}

.evidence-frame figcaption {
  padding: 14px 18px;
  border-top: 1px solid rgba(214, 210, 200, 0.35);
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.82rem;
}

.operating-loop {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-top: 34px;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.operating-loop span {
  font-weight: 800;
}

.operating-loop i {
  color: var(--color-primary);
  font-style: normal;
}

.build-timeline {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  margin: 52px 0 0;
  padding: 0;
  list-style: none;
}

.build-timeline li {
  position: relative;
  min-width: 0;
  padding: 0 14px 0 0;
}

.build-timeline li::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 36px;
  right: 0;
  height: 1px;
  background: var(--color-line);
}

.build-timeline li:last-child::before {
  display: none;
}

.build-timeline span {
  position: relative;
  z-index: 1;
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--color-primary);
  border-radius: 50%;
  background: var(--color-background);
  color: var(--color-primary);
  font-size: 0.72rem;
  font-weight: 800;
}

.build-timeline p {
  margin: 18px 0 0;
  color: var(--color-muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

.proof-grid .evidence-frame {
  align-self: start;
  padding: 12px;
}

.proof-list,
.delivery-steps {
  margin: 28px 0;
  padding: 0;
  list-style: none;
}

.proof-list li,
.delivery-step {
  padding: 14px 0;
  border-top: 1px solid var(--color-line);
}

.delivery-step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
}

.delivery-step span {
  color: var(--color-primary);
  font-family: var(--font-display);
}

.delivery-step p {
  margin: 0;
}

.case-closing {
  padding: clamp(90px, 11vw, 150px) 0;
  color: #f8f5ec;
  background: var(--color-deep-blue);
  text-align: center;
}

.case-closing h2 {
  max-width: 880px;
  margin-inline: auto;
  font-size: clamp(2.35rem, 4vw, 3rem);
}

.case-closing .case-eyebrow {
  color: #e4a57d;
}

.case-closing p {
  max-width: 720px;
  margin: 24px auto 0;
  color: #c8d1cc;
}

.closing-actions {
  justify-content: center;
}

.case-closing .button {
  border-color: #f8f5ec;
  background: #f8f5ec;
  color: var(--color-ink);
}

.case-closing .button-secondary {
  background: transparent;
  color: #f8f5ec;
}

/* Delivery Loop method page */
.method-hero {
  padding: clamp(86px, 11vw, 152px) 0 clamp(78px, 10vw, 132px);
  border-bottom: 1px solid var(--color-line);
}

.method-hero__grid,
.method-why {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 0.62fr);
  align-items: end;
  gap: clamp(50px, 9vw, 120px);
}

.method-definition {
  padding: 30px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.method-definition blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.4vw, 2rem);
  line-height: 1.35;
}

.method-phases {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.method-phase {
  min-width: 0;
  padding: clamp(26px, 4vw, 38px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.method-phase:nth-child(2) { background: var(--color-soft-blue); }
.method-phase:nth-child(3) { background: var(--color-soft-rust); }
.method-phase:nth-child(4) { background: var(--color-soft-green); }

.method-phase header {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 18px;
  align-items: start;
}

.method-phase header > span {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1.6rem;
}

.method-phase ol {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.method-phase li {
  padding: 18px 0;
  border-top: 1px solid rgba(101, 112, 106, 0.24);
}

.method-phase li p {
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 0.92rem;
}

.role-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.role-table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
}

.role-table th,
.role-table td {
  padding: 20px;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

.role-table tr > :last-child {
  border-right: 0;
}

.role-table tbody tr:last-child > * {
  border-bottom: 0;
}

.role-table thead th {
  color: var(--color-muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.role-table tbody th {
  width: 18%;
  color: var(--color-primary);
}

.artifact-grid,
.control-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.artifact-grid article {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-line);
  border-right: 0;
  background: var(--color-surface);
}

.artifact-grid article:first-child {
  border-radius: var(--radius-card) 0 0 var(--radius-card);
}

.artifact-grid article:last-child {
  border-right: 1px solid var(--color-line);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
}

.artifact-grid article > span {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1.4rem;
}

.artifact-grid h3 {
  margin-top: 30px;
}

.artifact-grid p,
.control-strip p {
  color: var(--color-muted);
  font-size: 0.88rem;
}

.control-strip {
  gap: 18px;
  margin-top: 22px;
}

.control-strip article {
  min-width: 0;
  padding: 22px;
  border-top: 3px solid var(--color-secondary);
  background: rgba(71, 105, 91, 0.08);
}

@media (max-width: 1120px) {
  .site-nav,
  .nav-links {
    gap: 15px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .case-hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
    gap: 44px;
  }

  .case-grid {
    gap: 20px;
  }

  .build-timeline {
    grid-template-columns: repeat(4, 1fr);
    row-gap: 32px;
  }

  .build-timeline li:nth-child(4)::before {
    display: none;
  }

  .artifact-grid,
  .control-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .artifact-grid article,
  .artifact-grid article:first-child,
  .artifact-grid article:last-child {
    border: 1px solid var(--color-line);
    border-radius: 0;
  }

  .artifact-grid article:first-child { border-radius: var(--radius-card) 0 0 0; }
  .artifact-grid article:nth-child(2) { border-radius: 0 var(--radius-card) 0 0; }
  .artifact-grid article:nth-child(3) { border-radius: 0 0 0 var(--radius-card); }
  .artifact-grid article:last-child { border-radius: 0 0 var(--radius-card) 0; }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .site-nav,
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 18px 24px 24px;
    border-bottom: 1px solid var(--color-line);
    background: var(--color-background);
  }

  .site-nav[data-open],
  .nav-links[data-open] {
    display: flex;
  }

  .site-nav a,
  .nav-links a,
  .language-toggle {
    width: 100%;
    justify-content: flex-start;
  }

  .language-toggle {
    margin-top: 8px;
  }

  .nav-contact {
    margin-top: 8px;
  }

  .hero-grid,
  .case-hero-grid,
  .section-intro,
  .case-overview-grid,
  .case-story-grid,
  .proof-grid,
  .delivery-grid,
  .collaboration-grid {
    grid-template-columns: 1fr;
  }

  .method-hero__grid,
  .method-why {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .hero-panel {
    max-width: 680px;
  }

  .proof-bar__grid,
  .metric-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-item:nth-child(3),
  .metric-strip article:nth-child(3) {
    border-left: 1px solid var(--color-line);
  }

  .proof-item:nth-child(-n + 2),
  .metric-strip article:nth-child(-n + 2) {
    border-bottom: 1px solid var(--color-line);
  }

  .loop-preview,
  .loop-trail {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 760px) {
  .site-shell,
  .case-shell,
  .site-header__inner,
  .nav.case-nav,
  .site-footer,
  .footer.case-footer {
    width: min(calc(100% - 32px), var(--site-shell));
  }

  body {
    font-size: 16px;
  }

  h1 {
    font-size: clamp(2.25rem, 11vw, 3rem);
  }

  h2,
  html[lang="zh-Hant"] h2 {
    font-size: clamp(2.05rem, 10vw, 2.65rem);
  }

  html[lang="zh-Hant"] h1,
  html[lang="zh-Hant"] .flow-case main h1 {
    font-size: clamp(2.45rem, 11vw, 3.05rem);
  }

  .hero-claim-full {
    display: none;
  }

  .hero-claim-compact {
    display: inline;
  }

  .hero,
  .case-hero {
    padding: 64px 0 72px;
  }

  .hero-grid,
  .case-hero-grid {
    gap: 40px;
  }

  .hero-panel,
  .case-card__body,
  .note-card,
  .snapshot-card,
  .capability-card,
  .principle-card,
  .boundary-card,
  .evidence-card {
    padding: 22px;
  }

  .site-section,
  .case-section {
    padding: 72px 0;
  }

  .section-intro {
    gap: 22px;
    margin-bottom: 34px;
  }

  .proof-bar__grid,
  .metric-strip,
  .loop-preview,
  .loop-trail,
  .case-grid,
  .proof-boundary,
  .snapshot-grid,
  .capability-grid,
  .principle-grid,
  .boundary-grid,
  .evidence-grid,
  .method-phases,
  .site-footer,
  .footer.case-footer {
    grid-template-columns: 1fr;
  }

  .proof-item,
  .proof-item:first-child,
  .proof-item:nth-child(3),
  .metric-strip article,
  .metric-strip article:first-child,
  .metric-strip article:nth-child(3) {
    border-left: 1px solid var(--color-line);
    border-right: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
  }

  .proof-item:last-child,
  .metric-strip article:last-child {
    border-bottom: 0;
  }

  .boundary-panel + .boundary-panel {
    border-top: 1px solid var(--color-line);
    border-left: 0;
  }

  .wechat-panel {
    grid-template-columns: 1fr;
  }

  .wechat-panel .button {
    width: 100%;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }

  .build-timeline {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .build-timeline li {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 12px;
    padding-bottom: 26px;
  }

  .build-timeline li::before {
    top: 38px;
    bottom: 0;
    left: 18px;
    width: 1px;
    height: auto;
  }

  .build-timeline li:nth-child(4)::before {
    display: block;
  }

  .build-timeline li:last-child::before {
    display: none;
  }

  .build-timeline p {
    margin: 7px 0 0;
  }

  .case-closing h2 {
    font-size: clamp(2.05rem, 10vw, 2.65rem);
  }

  .wechat-dialog {
    width: 100%;
    max-width: none;
    margin: auto 0 0;
    border-radius: var(--radius-card) var(--radius-card) 0 0;
  }

  .artifact-grid,
  .control-strip {
    grid-template-columns: 1fr;
  }

  .artifact-grid article,
  .artifact-grid article:first-child,
  .artifact-grid article:nth-child(2),
  .artifact-grid article:nth-child(3),
  .artifact-grid article:last-child {
    border-radius: 0;
  }

  .artifact-grid article:first-child {
    border-radius: var(--radius-card) var(--radius-card) 0 0;
  }

  .artifact-grid article:last-child {
    border-radius: 0 0 var(--radius-card) var(--radius-card);
  }
}

@media (max-width: 390px) {
  .hero-actions,
  .case-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .hero-panel {
    padding: 20px;
  }

  .hero-panel__label {
    padding-right: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  .site-header,
  .hero-actions,
  .case-actions,
  .wechat-panel,
  .site-footer,
  .footer.case-footer {
    display: none !important;
  }

  body {
    background: #fff;
  }
}