:root {
  --color-bg: #f4efe4;
  --color-paper: #fffaf0;
  --color-ink: #10110f;
  --color-muted: #68665f;
  --color-line: #10110f;
  --color-blue: #1e49e2;
  --color-soft: #e2dacb;
  --color-acid: #d8ff35;

  --font-display-en: Arial, Helvetica, sans-serif;
  --font-body-en: Arial, Helvetica, sans-serif;
  --font-display-zh: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-body-zh: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Source Han Sans SC", sans-serif;

  --page-max: 1200px;
  --page-gutter-desktop: 48px;
  --page-gutter-tablet: 32px;
  --page-gutter-mobile: 20px;
  --gutter: var(--page-gutter-desktop);
  --grid-gap: 24px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
  --space-7: 104px;
  --space-8: 144px;

  --t1: clamp(5.4rem, 16vw, 13.5rem);
  --t2: clamp(3rem, 8vw, 7rem);
  --t3: clamp(2.2rem, 5.4vw, 4.9rem);
  --t4: clamp(1.7rem, 3.6vw, 3.2rem);
  --t5: clamp(1.22rem, 2.2vw, 1.85rem);
  --t6: clamp(0.98rem, 1.25vw, 1.12rem);
  --t7: clamp(0.72rem, 0.9vw, 0.82rem);

  --border: 2px;
  --shadow: 8px 8px 0 var(--color-ink);
  --touch: 48px;
  --image-frame-gap: 24px;
  --gallery-control-overhang: 29px;
}

* { box-sizing: border-box; }

html {
  background: var(--color-bg);
  color: var(--color-ink);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    linear-gradient(rgba(16, 17, 15, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 17, 15, 0.04) 1px, transparent 1px),
    var(--color-bg);
  background-size: 24px 24px;
  font-family: var(--font-body-zh);
  font-size: var(--t6);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0;
  overflow-wrap: break-word;
}

html:lang(en) body {
  font-family: var(--font-body-en), var(--font-body-zh);
}

html:lang(en) body,
html:lang(en) h1,
html:lang(en) h2,
html:lang(en) h3,
html:lang(en) p,
html:lang(en) a,
html:lang(en) button,
html:lang(en) strong,
html:lang(en) span,
html:lang(en) em {
  word-break: normal;
  overflow-wrap: normal;
  hyphens: none;
}

body.sheet-open { overflow: hidden; }

a, button {
  color: inherit;
  font: inherit;
  letter-spacing: 0;
  transition: background-color 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out, box-shadow 180ms ease-out, transform 180ms ease-out;
}

a { text-decoration: none; }

button {
  cursor: pointer;
  border-radius: 0;
}

button:disabled {
  cursor: not-allowed;
}

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

h1, h2, h3, p, dl, dd {
  margin: 0;
}

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

.page-shell {
  width: min(100%, calc(var(--page-max) + var(--gutter) * 2));
  margin: 0 auto;
  padding: var(--space-2) var(--gutter) var(--space-5);
}

.site-top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 0 0 var(--space-3);
  background: linear-gradient(var(--color-bg) 74%, rgba(244, 239, 228, 0));
}

.top-mark,
.lang-switch,
.site-footer {
  display: flex;
  align-items: center;
}

.top-mark {
  gap: var(--space-1);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
}

.top-mark span:first-child {
  border: var(--border) solid var(--color-line);
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 0.7rem 0.8rem;
}

.top-mark span:last-child {
  color: var(--color-muted);
}

.lang-switch {
  gap: 6px;
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.lang-switch button {
  min-width: var(--touch);
  min-height: 38px;
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  font-weight: 900;
}

.lang-switch button.active {
  background: var(--color-acid);
}

section + section {
  margin-top: var(--space-8);
}

.large-frame {
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  box-shadow: var(--shadow);
}

.outline-label {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  margin-bottom: var(--space-3);
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  color: var(--color-blue);
  padding: 0.48rem 0.72rem;
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
  line-height: 1.05;
  text-transform: uppercase;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--grid-gap);
}

.identity-frame {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--grid-gap);
  min-height: min(760px, calc(100vh - 96px));
  padding: var(--space-5);
}

.hero-primary {
  grid-column: 1 / 9;
  align-self: stretch;
  display: flex;
  min-width: 0;
  flex-direction: column;
}

h1 {
  font-family: var(--font-display-en);
  font-size: var(--t1);
  font-weight: 900;
  line-height: 0.82;
  text-transform: uppercase;
  word-break: normal;
}

#hero-title {
  margin-left: -0.025em;
  white-space: nowrap;
}

#hero-title,
.hero-role span,
.hero-statement span,
.collab-copy .eyebrow,
.collab-copy h2,
.collab-detail-hero h1,
.collab-secondary,
.outline-label,
.platform-text strong,
.platform-text em,
.full-action .cta-copy > span,
.full-action strong,
.process-copy h3,
.process-no,
.closing-section h2 {
  white-space: nowrap;
}

.hero-role {
  margin-top: var(--space-3);
}

.hero-role span,
.hero-role small,
.hero-statement small,
.collab-secondary,
.eyebrow,
.step-en {
  display: block;
  color: var(--color-blue);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
  line-height: 1.18;
  text-transform: uppercase;
}

.hero-role small:empty,
.hero-statement small:empty {
  display: none;
}

.cta-copy > span:empty,
.closing-section p:empty {
  display: none;
}

.hero-role span {
  color: var(--color-ink);
  font-family: var(--font-display-zh);
  font-size: var(--t4);
  line-height: 1.08;
  text-transform: none;
}

.hero-statement {
  margin-top: auto;
}

.hero-statement span {
  display: block;
  max-width: 9ch;
  font-family: var(--font-display-zh);
  font-size: var(--t2);
  font-weight: 900;
  line-height: 0.98;
}

.hero-statement small {
  margin-top: var(--space-2);
}

.hero-meta {
  grid-column: 9 / 13;
  align-self: end;
  display: grid;
  gap: var(--space-2);
}

.hero-meta dl {
  border-top: var(--border) solid var(--color-line);
  padding-top: var(--space-2);
}

.hero-meta dt {
  color: var(--color-blue);
  font-size: var(--t7);
  font-weight: 900;
}

.hero-meta dd span {
  display: block;
  color: var(--color-muted);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.hero-meta dd strong {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--t6);
  font-weight: 900;
  line-height: 1.25;
}

.find-grid > div:first-child { grid-column: 1 / 6; }
.find-grid > div:last-child { grid-column: 6 / 13; }

.find-section {
  scroll-margin-top: 96px;
}

h2 {
  font-family: var(--font-display-zh);
  font-size: var(--t2);
  font-weight: 900;
  line-height: 0.98;
}

html:lang(en) h2 {
  font-family: var(--font-display-en);
}

html:lang(en) .hero-statement span,
html:lang(en) .closing-section h2 {
  max-width: 11ch;
}

html:lang(en) .closing-section h2 {
  max-width: 18ch;
  font-size: clamp(3.5rem, 7vw, 6rem);
}

html:lang(en) .hero-meta dd span {
  display: none;
}

.section-copy {
  max-width: 26rem;
  margin-top: var(--space-4);
  color: var(--color-muted);
  font-size: var(--t5);
  line-height: 1.4;
}

.section-copy,
.manifesto,
.project-info p:not(.outline-label),
.detail-intro,
.font-intro {
  text-align: justify;
  text-align-last: left;
}

.step-statement,
.step-body {
  text-align: left;
  text-align-last: auto;
  word-spacing: normal;
}

html:lang(en) .section-copy,
html:lang(en) .manifesto,
html:lang(en) .project-info p:not(.outline-label),
html:lang(en) .detail-intro,
html:lang(en) .step-statement,
html:lang(en) .step-body,
html:lang(en) .font-intro {
  text-align: left;
  text-align-last: auto;
  word-spacing: normal;
}

.find-actions {
  display: grid;
  align-content: end;
  gap: var(--space-2);
}

.platform-action,
.full-action,
.black-action {
  display: grid;
  align-items: stretch;
  border: var(--border) solid var(--color-line);
  text-align: left;
}

.platform-action {
  grid-template-columns: 88px minmax(0, 1fr) 48px;
  min-height: 104px;
  background: var(--color-paper);
}

.platform-color {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  margin: auto 0 auto var(--space-2);
  border: var(--border) solid var(--color-line);
  background: var(--platform-color, var(--color-blue));
  color: var(--platform-ink, var(--color-ink));
  font-family: var(--font-display-en);
  font-size: 0.95rem;
  font-weight: 900;
}

.platform-text {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding: var(--space-2);
}

.platform-text small,
.platform-text em {
  color: var(--color-muted);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-style: normal;
  font-weight: 900;
  line-height: 1.15;
  text-transform: uppercase;
}

.platform-text small {
  display: none;
}

.platform-text strong {
  font-size: var(--t5);
  font-weight: 900;
  line-height: 1.1;
}

.platform-action b {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display-en);
  font-size: 1.4rem;
  font-weight: 900;
  transition: transform 180ms ease-out;
}

.platform-action.is-disabled {
  opacity: 0.58;
}

.platform-action:not(.is-disabled):hover {
  background: var(--color-acid);
  box-shadow: var(--shadow);
  transform: translate(-2px, -2px);
}

.platform-action:not(.is-disabled):hover b {
  transform: translateX(4px);
}

.collab-home-grid > .collab-copy {
  grid-column: 1 / 10;
}

.collab-copy h2 {
  margin-top: var(--space-2);
  font-family: var(--font-display-en);
  font-size: var(--t3);
  text-transform: uppercase;
}

.manifesto {
  margin-top: var(--space-5);
  font-size: var(--t5);
  font-weight: 800;
  line-height: 1.28;
}

.gallery-block {
  position: relative;
  aspect-ratio: 4 / 5;
  min-width: 0;
  overflow: hidden;
}

.project-gallery {
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  overflow: visible;
  padding: var(--image-frame-gap);
  box-shadow: var(--shadow);
}

.project-gallery .gallery-toolbar {
  display: none;
}

.project-gallery .gallery-controls {
  top: var(--image-frame-gap);
  right: var(--image-frame-gap);
  bottom: var(--image-frame-gap);
  left: var(--image-frame-gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
  pointer-events: none;
}

.gallery-toolbar,
.gallery-controls {
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
}

.gallery-toolbar {
  top: 0;
  border-bottom: var(--border) solid var(--color-line);
  background: var(--color-paper);
  padding: var(--space-2);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.gallery-controls {
  bottom: 0;
  justify-content: flex-end;
  gap: var(--space-1);
  padding: var(--space-2);
}

.gallery-controls button {
  width: 58px;
  height: 34px;
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  color: var(--color-ink);
  border-radius: 999px;
  font-family: var(--font-display-en);
  font-weight: 900;
  pointer-events: auto;
  transition: opacity 140ms ease-out, transform 140ms ease-out;
}

.project-gallery .gallery-controls button {
  margin-inline: calc(var(--gallery-control-overhang) * -1);
  opacity: 0;
  pointer-events: none;
}

.gallery-controls button.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.project-gallery:hover .gallery-controls button:not(.is-hidden),
.project-gallery.is-scrolling-page .gallery-controls button:not(.is-hidden) {
  opacity: 1;
  pointer-events: auto;
}

.gallery-track {
  display: flex;
  height: auto;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.gallery-track::-webkit-scrollbar { display: none; }

.gallery-slide {
  display: flex;
  min-width: 100%;
  flex: 0 0 100%;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-2);
  scroll-snap-align: start;
  background:
    linear-gradient(135deg, rgba(30, 73, 226, 0.11), transparent 42%),
    repeating-linear-gradient(0deg, rgba(16,17,15,0.06), rgba(16,17,15,0.06) 1px, transparent 1px, transparent 18px),
    var(--color-paper);
  padding: calc(var(--space-6) + var(--space-4)) var(--space-4);
}

.gallery-slide span {
  color: var(--color-blue);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.gallery-slide strong {
  max-width: 8ch;
  font-family: var(--font-display-en);
  font-size: var(--t3);
  font-weight: 900;
  line-height: 0.95;
}

.gallery-image-slide {
  position: relative;
  display: block;
  background: transparent;
  padding: 0;
}

.gallery-image-frame {
  width: 100%;
  margin: 0;
  border: var(--border) solid var(--color-line);
  background: transparent;
  overflow: hidden;
}

.gallery-image-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.full-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 108px;
  margin-top: var(--space-4);
  border: var(--border) solid var(--color-line);
  background: var(--color-ink);
  color: var(--color-bg);
  padding: var(--space-3);
}

.full-action span,
.full-action strong,
.full-action b,
.black-action {
  display: flex;
  align-items: center;
  font-weight: 900;
  line-height: 1.12;
}

.full-action .cta-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  font-size: var(--t5);
}

.full-action .cta-copy > span,
.full-action > span:not(.cta-copy) {
  font-size: var(--t5);
}

.full-action strong {
  font-family: var(--font-display-en);
  font-size: var(--t6);
  text-transform: uppercase;
}

.full-action b {
  justify-content: center;
  margin-left: auto;
  font-size: 2rem;
  transition: transform 180ms ease-out;
}

.full-action:hover,
.black-action:hover {
  background: var(--color-paper);
  color: var(--color-ink);
}

.full-action:hover b {
  transform: translateX(4px);
}

.work-section > h2 {
  margin-bottom: var(--space-5);
}

.work-list {
  display: grid;
  gap: var(--space-7);
}

.project-row {
  display: grid;
  gap: var(--space-3);
}

.project-row > .gallery-block {
  width: 100%;
}

.project-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.project-info h3 {
  font-family: var(--font-display-en), var(--font-display-zh);
  font-size: var(--t3);
  font-weight: 900;
  line-height: 0.98;
  text-transform: uppercase;
}

.project-info p:not(.outline-label) {
  max-width: 30rem;
  margin-top: var(--space-2);
  color: var(--color-muted);
  font-size: var(--t5);
  line-height: 1.4;
}

.social-stack {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding-top: var(--space-1);
}

.social-action {
  min-height: 64px;
}

.social-action .platform-color {
  width: 48px;
  height: 48px;
}

.social-action .platform-text {
  padding-top: 10px;
  padding-bottom: 10px;
}

.social-action .platform-text strong {
  font-size: clamp(1.1rem, 1.7vw, 1.55rem);
}

.closing-section {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--grid-gap);
  align-items: center;
}

.closing-section > div {
  grid-column: 1 / 8;
}

.closing-section h2 {
  max-width: 8ch;
}

.closing-section p:last-child {
  margin-top: var(--space-3);
  color: var(--color-blue);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
  line-height: 1.24;
}

.closing-action {
  grid-column: 8 / 13;
  width: 100%;
}

.site-footer {
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-7);
  border-top: var(--border) solid var(--color-line);
  padding-top: var(--space-3);
  color: var(--color-muted);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
  text-transform: uppercase;
}

.collab-detail-hero {
  padding: var(--space-5);
}

.collab-detail-hero h1 {
  max-width: none;
  margin-top: 0;
  font-family: var(--font-display-zh);
  color: var(--color-blue);
  font-size: var(--t3);
  font-weight: 900;
  line-height: 0.98;
}

html:lang(en) .collab-detail-hero h1 {
  font-family: var(--font-display-en);
  font-weight: 900;
  text-transform: uppercase;
}

.collab-secondary {
  margin-top: var(--space-2);
  color: var(--color-ink);
  font-family: var(--font-display-en);
  font-size: var(--t3);
  font-weight: 900;
  line-height: 0.98;
  text-transform: uppercase;
}

.collab-secondary .secondary-line {
  display: block;
  white-space: nowrap;
}

.detail-intro {
  max-width: 48rem;
  margin-top: var(--space-5);
  font-size: var(--t5);
  font-weight: 800;
  line-height: 1.38;
}

.process-section {
  margin-top: var(--space-8);
}

.process-section h2 {
  max-width: 13ch;
  margin-bottom: var(--space-2);
  font-family: var(--font-display-en);
}

html:lang(zh-CN) .process-section h2 {
  max-width: 14ch;
  font-family: var(--font-display-zh);
}

.process-title-en {
  margin-bottom: var(--space-5);
  color: var(--color-blue);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.process-title-en,
.step-en {
  display: none;
}

.process-journal {
  border-top: var(--border) solid var(--color-line);
}

.process-step {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--grid-gap);
  border-bottom: var(--border) solid var(--color-line);
  padding: var(--space-5) 0;
}

.process-no {
  grid-column: 1 / 3;
  color: var(--color-blue);
  font-family: var(--font-display-en);
  font-size: var(--t3);
  font-weight: 900;
  line-height: 0.9;
}

.process-copy {
  grid-column: 3 / 13;
}

.process-copy h3 {
  margin-top: var(--space-1);
  font-size: var(--t4);
  font-weight: 900;
  line-height: 1.08;
}

.step-statement {
  margin-top: var(--space-3);
  font-size: var(--t5);
  font-weight: 900;
  line-height: 1.32;
}

.step-body {
  max-width: 48rem;
  margin-top: var(--space-2);
  color: var(--color-muted);
}

.rights-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.rights-strip span {
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  color: var(--color-blue);
  padding: var(--space-2);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.detail-end {
  padding: var(--space-5);
}

.detail-end h2 {
  margin-bottom: var(--space-5);
}

.sheet-layer {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(16, 17, 15, 0.68);
  padding: var(--space-3);
}

.sheet-layer.open {
  display: flex;
}

.sheet {
  width: min(100%, 470px);
  max-height: min(760px, 92vh);
  overflow: auto;
  padding: var(--space-4);
}

.sheet-close {
  float: right;
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  padding: 0.6rem 0.75rem;
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.sheet h2 {
  clear: both;
  margin-bottom: var(--space-3);
  font-family: var(--font-display-en);
}

.qr-wrap {
  border: var(--border) solid var(--color-line);
  background: #fff;
  padding: var(--space-2);
}

.id-list {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-3);
  border-top: var(--border) solid var(--color-line);
  border-bottom: var(--border) solid var(--color-line);
  padding: var(--space-2) 0;
}

.id-list dt {
  color: var(--color-blue);
  font-family: var(--font-display-en);
  font-size: var(--t7);
  font-weight: 900;
}

.id-list dd {
  font-weight: 900;
}

.black-action {
  padding: var(--space-3);
  justify-content: center;
  border: var(--border) solid var(--color-line);
  width: 100%;
  margin-top: var(--space-3);
  background: var(--color-ink);
  color: var(--color-bg);
}

.copy-feedback {
  min-height: 1.6em;
  margin-top: var(--space-2);
  color: var(--color-blue);
  font-weight: 900;
}

.copy-toast {
  position: fixed;
  right: var(--gutter);
  bottom: var(--space-4);
  z-index: 70;
  max-width: min(320px, calc(100vw - var(--gutter) * 2));
  border: var(--border) solid var(--color-line);
  background: var(--color-acid);
  color: var(--color-ink);
  box-shadow: var(--shadow);
  padding: 0.9rem 1rem;
  font-family: var(--font-display-en), var(--font-display-zh);
  font-size: var(--t7);
  font-weight: 900;
  line-height: 1.15;
  text-transform: uppercase;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 160ms ease-out, transform 160ms ease-out;
}

.copy-toast.show {
  opacity: 1;
  transform: translateY(0);
}

.font-page h1 {
  font-family: var(--font-display-en);
  font-size: var(--t2);
}

.font-intro {
  max-width: 52rem;
  margin: var(--space-3) 0 var(--space-5);
  color: var(--color-muted);
  font-size: var(--t5);
}

.font-grid {
  display: grid;
  gap: var(--space-4);
}

.font-card {
  border: var(--border) solid var(--color-line);
  background: var(--color-paper);
  padding: var(--space-4);
}

.font-card h2 {
  font-size: var(--t4);
  line-height: 1.05;
}

.font-card p {
  margin-top: var(--space-2);
  font-size: var(--t5);
  line-height: 1.35;
}

.font-a { font-family: "Microsoft YaHei", "PingFang SC", sans-serif; }
.font-b { font-family: "Noto Sans SC", "Source Han Sans SC", sans-serif; }
.font-c { font-family: "Source Han Sans SC", "Noto Sans SC", sans-serif; }
.font-d { font-family: "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif; }

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 999;
  display: none;
  pointer-events: none;
  background-image: linear-gradient(90deg, rgba(30, 73, 226, 0.12) 0 calc((100% - 11 * var(--grid-gap)) / 12), transparent calc((100% - 11 * var(--grid-gap)) / 12));
  background-size: calc((100% + var(--grid-gap)) / 12) 100%;
  background-origin: content-box;
  padding-inline: max(var(--gutter), calc((100vw - var(--page-max)) / 2 + var(--gutter)));
}

body.debug-grid::before { display: block; }

@media (max-width: 900px) {
  :root { --gutter: var(--page-gutter-tablet); --grid-gap: 18px; }

  .identity-frame,
  .section-grid,
  .project-row,
  .closing-section,
  .process-step {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .hero-primary,
  .hero-meta,
  .find-grid > div:first-child,
  .find-grid > div:last-child,
  .collab-home-grid > .collab-copy,
  .project-row > .gallery-block,
  .project-info,
  .social-stack,
  .closing-section > div,
  .closing-action,
  .process-no,
  .process-copy {
    grid-column: 1 / -1;
  }

  .project-info {
    padding-left: 0;
  }

  .identity-frame {
    min-height: auto;
  }

  .hero-meta {
    margin-top: var(--space-5);
  }

  .find-actions {
    align-content: start;
  }

  .project-row {
    gap: var(--space-4);
  }

  .process-step {
    padding: var(--space-4) 0;
    row-gap: 6px;
  }

  .process-copy h3 {
    margin-top: 0;
  }
}

@media (max-width: 620px) {
  :root {
    --gutter: var(--page-gutter-mobile);
    --grid-gap: 14px;
    --shadow: 5px 5px 0 var(--color-ink);
    --image-frame-gap: 16px;
    --space-7: 76px;
    --space-8: 100px;
  }

  .page-shell {
    padding-top: var(--space-2);
  }

  .site-top {
    gap: var(--space-1);
    padding-bottom: var(--space-2);
  }

  .top-mark span:last-child,
  .lang-switch span {
    display: none;
  }

  .identity-frame,
  .collab-detail-hero,
  .detail-end {
    padding: var(--space-3);
  }

  .outline-label {
    margin-bottom: 14px;
  }

  .section-copy,
  .project-info p:not(.outline-label),
  .closing-section p:last-child {
    margin-top: var(--space-2);
  }

  .project-info p:not(.outline-label) {
    margin-top: 6px;
  }

  .hero-statement span {
    max-width: none;
    font-size: clamp(3rem, 13vw, 4.1rem);
  }

  #hero-title {
    font-size: clamp(4.6rem, 24vw, 7.2rem);
  }

  .hero-role {
    margin-top: var(--space-1);
  }

  .hero-statement {
    margin-top: var(--space-4);
  }

  html:lang(en) .hero-statement span {
    max-width: none;
    font-size: clamp(1.45rem, 5.8vw, 2.2rem);
  }

  .collab-copy .eyebrow {
    margin-top: var(--space-1);
    font-family: var(--font-display-zh);
    font-size: clamp(2.6rem, 13.5vw, 3.5rem);
    line-height: 0.98;
    text-transform: none;
  }

  html:lang(en) .collab-copy .eyebrow {
    font-family: var(--font-display-en);
    font-weight: 900;
    text-transform: uppercase;
  }

  .collab-copy .outline-label {
    margin-bottom: 14px;
  }

  .collab-copy .manifesto {
    margin-top: var(--space-2);
  }

  .step-statement {
    margin-top: var(--space-1);
  }

  .process-step {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 8px;
    row-gap: var(--space-1);
    align-items: baseline;
  }

  .process-no {
    grid-column: 1;
  }

  .process-copy {
    display: contents;
  }

  .process-copy h3 {
    grid-column: 2;
    color: var(--color-blue);
    font-family: var(--font-display-en), var(--font-display-zh);
    font-size: var(--t3);
    font-weight: 900;
    line-height: 0.9;
    white-space: nowrap;
  }

  html:lang(en) .process-copy h3,
  html:lang(en) .process-no {
    font-size: clamp(1.45rem, 6.1vw, 2.15rem);
  }

  .step-statement,
  .step-body {
    grid-column: 1 / -1;
  }

  .platform-action {
    grid-template-columns: 74px minmax(0, 1fr) 42px;
    min-height: 88px;
  }

  .platform-color {
    width: 50px;
    height: 50px;
    margin-left: 12px;
  }

  .platform-text {
    padding: var(--space-2) 12px;
  }

  .full-action {
    min-height: 88px;
  }

  .full-action strong {
    display: block;
  }

  .closing-section h2 {
    max-width: none;
    line-height: 1.06;
  }

  html:lang(en) .closing-section h2 {
    max-width: none;
    font-size: clamp(1.42rem, 5.2vw, 1.85rem);
    line-height: 1.04;
  }

  .closing-section {
    row-gap: 22px;
  }

  .closing-action {
    margin-top: 0;
  }

  .gallery-slide {
    padding-inline: var(--space-3);
  }

  .gallery-image-slide {
    padding: 0;
  }

  .project-row {
    gap: 12px;
  }

  .social-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .social-action {
    grid-template-columns: 56px minmax(0, 1fr);
    min-height: 76px;
  }

  .social-action .platform-color {
    width: 38px;
    height: 38px;
    margin-left: 10px;
    font-size: 0.8rem;
  }

  .social-action .platform-text {
    padding: 8px 10px;
  }

  .social-action .platform-text small,
  .social-action .platform-text em {
    font-size: 0.62rem;
  }

  .social-action .platform-text strong {
    font-size: 0.86rem;
  }

  .social-action b {
    display: none;
  }

  .gallery-slide strong {
    font-size: var(--t4);
  }

  .rights-strip {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-wrap: wrap;
  }
}