/* =========================================================
   caospace.com · personal homepage · v1 — Apple-clean
   2026-09-13 · Mobile-first · tokens + reveal animations
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  /* color — Apple-leaning neutral, one accent */
  --bg:        #fafafa;   /* near-white, not warm cream */
  --surface:   #ffffff;   /* card surface */
  --ink:       #1d1d1f;   /* Apple-style near-black */
  --ink-soft:  #6e6e73;   /* Apple mid-gray */
  --ink-faint: #86868b;   /* lighter meta */
  --rule:      #d2d2d7;   /* hairline */
  --rule-soft: #e5e5e7;
  --accent:    #0066cc;   /* Apple-link blue */
  --accent-h:  #0077ed;   /* hover */

  /* type */
  --font-zh-display: 'Noto Serif SC', 'PingFang SC', serif;
  --font-zh-body:    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-en:         'Cormorant Garamond', 'Times New Roman', serif;
  --font-sans-en:    -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;

  /* fluid type — restrained (per Carl 2026-09-13 "不要浮夸") */
  --t-hero:        clamp(2.6rem, 7vw, 4.8rem);       /* 42–77px, was 54–120 */
  --t-hero-tag:    clamp(1.0rem, 2.2vw, 1.3rem);
  --t-h2:          clamp(2.0rem, 5vw, 3.0rem);       /* 32–48 */
  --t-h3:          clamp(1.15rem, 2.6vw, 1.45rem);   /* 18–23 */
  --t-lede:        clamp(1.15rem, 2.6vw, 1.45rem);
  --t-body:        clamp(0.98rem, 1.7vw, 1.075rem);
  --t-meta:        clamp(0.82rem, 1.4vw, 0.92rem);
  --t-en:          clamp(0.9rem, 1.5vw, 1.0rem);

  /* spacing — Apple rhythm: extreme whitespace */
  --pad-x:         clamp(20px, 5vw, 56px);
  --gap-section:   clamp(96px, 18vw, 200px);        /* between sections */
  --gap-block:     clamp(32px, 5vw, 56px);
  --gap-tight:     clamp(16px, 2.5vw, 24px);

  --max-w:         1120px;
  --nav-h:         56px;

  /* motion */
  --ease:          cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast:      0.25s;
  --dur:           0.5s;
  --dur-slow:      0.9s;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-zh-body);
  font-size: var(--t-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga";
}

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

a {
  color: var(--accent);
  text-decoration: none;
  position: relative;
  transition: color var(--dur-fast) var(--ease);
}
a:hover { color: var(--accent-h); }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}

/* "draw" underline effect for nav + section links */
.nav-links a::after,
.primary-link::after,
.work-card .work-arrow {
  transition: opacity var(--dur-fast) var(--ease);
}

/* ---------- Language toggle (no display:none — fade + flow) ---------- */
[data-lang-en], [data-lang-zh] {
  transition: opacity var(--dur-fast) var(--ease);
}
[data-lang-en] { display: none; font-family: var(--font-en); font-style: italic; }
body[data-lang="en"] [data-lang-zh] { display: none; }
body[data-lang="en"] [data-lang-en] { display: inline; }

/* ---------- Nav (sticky, Apple-style blur) ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: rgba(250, 250, 250, 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--rule-soft);
  transition: background var(--dur-fast) var(--ease);
}
.nav-inner {
  max-width: var(--max-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex;
  align-items: center;
  gap: clamp(20px, 4vw, 48px);
}
.nav-brand {
  color: var(--ink);
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  letter-spacing: 0.005em;
  border: none;
}
.nav-brand:hover { color: var(--accent); }
.nav-brand [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 1.05em;
}

.nav-links {
  display: flex;
  gap: clamp(16px, 3vw, 36px);
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  color: var(--ink);
  font-size: var(--t-meta);
  letter-spacing: 0.02em;
  border: none;
  padding: 8px 0;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 1px;
  background: var(--ink);
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform var(--dur-fast) var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after,
.nav-links a:focus-visible::after { transform: scaleX(1); }
.nav-links [data-lang-en] {
  font-family: var(--font-sans-en);
  font-style: normal;
  font-size: 0.95em;
}

.nav-lang {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-en);
  font-size: var(--t-en);
  color: var(--ink-soft);
  margin-left: clamp(8px, 2vw, 24px);
}
.lang-btn {
  background: none;
  border: none;
  padding: 8px 4px;
  min-height: 32px;
  font: inherit;
  color: inherit;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: color var(--dur-fast) var(--ease);
}
.lang-btn:hover { color: var(--ink); }
.lang-btn.is-active {
  color: var(--ink);
  font-style: italic;
}
.lang-sep { color: var(--rule); user-select: none; }

/* small screens — collapse nav-links to icon-rail? No: keep as inline but tighter */
@media (max-width: 640px) {
  .nav-inner { gap: 12px; }
  .nav-links { gap: 12px; }
  .nav-links a { padding: 8px 0; font-size: 0.86rem; }
}

/* ---------- Hero (the Apple move — one screen, one statement) ---------- */
.hero {
  min-height: calc(100vh - var(--nav-h));
  min-height: calc(100svh - var(--nav-h));
  padding: clamp(40px, 8vw, 96px) var(--pad-x) clamp(40px, 8vw, 80px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: #0a0a0a; /* fallback under image */
  isolation: isolate;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 55%;
  /* slow ken-burns drift — Apple-ish */
  animation: hero-drift 22s ease-in-out infinite alternate;
  transform-origin: center 65%;
}
@keyframes hero-drift {
  from { transform: scale(1.04); }
  to   { transform: scale(1.10); }
}
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg,
      rgba(0,0,0,0.10) 0%,
      rgba(0,0,0,0.05) 45%,
      rgba(0,0,0,0.45) 100%);
  pointer-events: none;
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.18);
}
.hero-title {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: var(--t-hero);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin: 0 0 clamp(16px, 3vw, 28px);
  color: #ffffff;
}
.hero-title-line {
  display: block;
  opacity: 0;
  animation: hero-fade-up 1.1s var(--ease) 0.25s forwards;
}
.hero-title-en {
  font-family: var(--font-en);
  font-style: italic;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.hero-tag {
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  color: rgba(255, 255, 255, 0.92);
  margin: 0 0 clamp(24px, 5vw, 40px);
  max-width: 26em;
  font-weight: 400;
  letter-spacing: 0.01em;
}
.hero-tag [data-lang-en] {
  font-family: var(--font-sans-en);
  font-style: normal;
  letter-spacing: 0.01em;
  font-size: 0.88em;
  color: rgba(255, 255, 255, 0.78);
}
.hero-lede {
  font-size: var(--t-lede);
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  max-width: 26em;
  line-height: 1.55;
  font-weight: 400;
  opacity: 0;
  animation: hero-fade-up 0.9s var(--ease) 0.85s forwards;
}
.hero-lede [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.95em;
  color: rgba(255, 255, 255, 0.7);
}

.hero-scrollhint {
  position: absolute;
  bottom: clamp(20px, 4vw, 36px);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-sans-en);
  font-size: var(--t-meta);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  opacity: 0;
  animation: hero-fade-up 0.9s var(--ease) 1.4s forwards;
}
.hero-scrollhint [data-lang-en] { font-style: normal; font-family: var(--font-sans-en); }

@keyframes hero-fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Section shell — whitespace separator, no rule ---------- */
.section {
  padding: var(--gap-section) var(--pad-x);
}
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

/* Apple-style section title — small uppercase eyebrow + huge display title */
.section-title {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: var(--t-h2);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(40px, 6vw, 72px);
  color: var(--ink);
  max-width: 16em;
}
.section-title [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.95em;
  color: var(--ink);
}

.section-lede {
  font-size: var(--t-lede);
  color: var(--ink);
  line-height: 1.55;
  margin: 0 0 var(--gap-block);
  max-width: 28em;
  font-weight: 400;
}
.section-lede [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.95em;
  color: var(--ink-soft);
}

/* ---------- About / identity tags ---------- */
.identity-tags {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--gap-block);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.identity-tag {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-family: var(--font-zh-display);
  font-size: var(--t-body);
  color: var(--ink);
  transition: border-color var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease);
}
.identity-tag:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}
.identity-tag [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.92em;
  margin-left: 4px;
}

/* ---------- Teaching — courses grid (Apple cards) ---------- */
.course-grid {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--gap-block);
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 720px) {
  .course-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 980px) {
  .course-grid { grid-template-columns: repeat(4, 1fr); }
}
.course-card {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: 18px;
  padding: 28px 24px 24px;
  transition: border-color var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease),
              box-shadow var(--dur) var(--ease);
  min-height: 132px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.course-card:hover {
  border-color: var(--rule);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.06);
}
.course-name {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: var(--t-h3);
  margin: 0 0 10px;
  line-height: 1.3;
  color: var(--ink);
}
.course-name [data-lang-en] {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.78em;
  color: var(--ink-soft);
  margin-top: 4px;
}
.course-meta {
  margin: 0;
  font-size: var(--t-meta);
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}
.course-meta [data-lang-en] {
  font-family: var(--font-sans-en);
  font-style: normal;
}

/* Primary link — "go to current class" */
.primary-link {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  margin-top: var(--gap-tight);
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--font-zh-display);
  font-size: var(--t-h3);
  font-weight: 500;
  border-radius: 0;
  width: 100%;
  justify-content: space-between;
  transition: color var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease);
}
.primary-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.primary-link-main [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.92em;
  color: var(--ink-soft);
}
.primary-link:hover .primary-link-main [data-lang-en] {
  color: var(--accent);
}
.primary-link-arrow {
  font-family: var(--font-sans-en);
  font-size: 1em;
  transition: transform var(--dur-fast) var(--ease);
}
.primary-link:hover .primary-link-arrow { transform: translateX(4px); }

.footnote {
  margin: var(--gap-tight) 0 0;
  font-size: var(--t-meta);
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}
.footnote [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}

/* ---------- Research ---------- */
.research-tags {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--gap-block);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}
.research-tag {
  font-family: var(--font-zh-display);
  font-size: var(--t-body);
  color: var(--ink);
  padding: 6px 0;
  position: relative;
  transition: color var(--dur-fast) var(--ease);
}
.research-tag:hover { color: var(--accent); }
.research-tag [data-lang-en] {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.85em;
  color: var(--ink-soft);
  margin-top: 2px;
}

.paper-list {
  list-style: none;
  counter-reset: paper;
  padding: 0;
  margin: 0 0 var(--gap-block);
}
.paper-item {
  counter-increment: paper;
  padding: clamp(20px, 3vw, 28px) 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}
@media (min-width: 720px) {
  .paper-item { grid-template-columns: 56px 1fr auto; gap: 24px; align-items: baseline; }
}
.paper-item::before {
  content: counter(paper, decimal-leading-zero);
  font-family: var(--font-en);
  font-style: italic;
  font-size: var(--t-en);
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}
.paper-title {
  font-family: var(--font-zh-display);
  font-size: var(--t-h3);
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}
.paper-title [data-lang-en] {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.92em;
  color: var(--ink-soft);
  margin-top: 4px;
}
.paper-meta {
  font-size: var(--t-meta);
  color: var(--ink-soft);
  margin: 0;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.doctorate {
  padding: clamp(24px, 4vw, 40px);
  background: var(--surface);
  border-radius: 18px;
  border: 1px solid var(--rule-soft);
}
.doctorate-label {
  font-family: var(--font-sans-en);
  font-size: var(--t-meta);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 12px;
}
.doctorate-label [data-lang-en] { font-style: normal; }
.doctorate-title {
  font-family: var(--font-zh-display);
  font-size: var(--t-h3);
  font-weight: 500;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--ink);
}
.doctorate-title [data-lang-en] {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.92em;
  color: var(--ink-soft);
  margin-top: 4px;
}
.doctorate-meta {
  font-size: var(--t-meta);
  color: var(--ink-soft);
  margin: 0;
}
.doctorate-meta [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}

/* ---------- Works — feature + secondary ---------- */
.works-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* feature (Meta-NING) — full row, two-column on desktop */
.work-feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-block);
  padding-bottom: var(--gap-block);
  border-bottom: 1px solid var(--rule-soft);
  margin-bottom: var(--gap-block);
}
@media (min-width: 880px) {
  .work-feature {
    grid-template-columns: 1.05fr 1fr;
    gap: clamp(48px, 6vw, 96px);
    align-items: center;
  }
}
.work-year {
  font-family: var(--font-sans-en);
  font-style: italic;
  font-size: var(--t-en);
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  margin: 0 0 12px;
}
.work-title {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin: 0 0 20px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.work-title [data-lang-en] {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.78em;
  color: var(--ink);
  margin-top: 6px;
}
.work-desc {
  font-size: var(--t-lede);
  line-height: 1.55;
  margin: 0 0 16px;
  color: var(--ink);
  max-width: 32em;
}
.work-desc [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.92em;
  color: var(--ink-soft);
  display: block;
  margin-top: 6px;
}
.work-credit {
  font-size: var(--t-meta);
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.65;
}
.work-credit [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}

/* feature image (Meta-NING) — real photo, no placeholder */
.work-feature-media {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--rule-soft);
  background: var(--rule-soft);
  aspect-ratio: 4 / 3;
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.work-feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 1.2s var(--ease);
}
.work-feature-media:hover {
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.10);
}
.work-feature-media:hover img {
  transform: scale(1.04);
}
.work-feature-caption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  margin: 0;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: 999px;
  font-family: var(--font-zh-display);
  font-size: var(--t-meta);
  color: var(--ink);
  letter-spacing: 0.04em;
}
.work-feature-caption [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}

/* secondary feature image — full-bleed, lower key */
.work-extra {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--gap-block);
}
.work-extra-media {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--rule-soft);
  background: var(--rule-soft);
  aspect-ratio: 21 / 9;
}
.work-extra-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 1.2s var(--ease);
}
.work-extra-media:hover img {
  transform: scale(1.03);
}
.work-extra-caption {
  position: absolute;
  right: 14px;
  bottom: 14px;
  margin: 0;
  padding: 6px 12px;
  background: rgba(0, 0, 0, 0.55);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: 999px;
  color: #fff;
  font-family: var(--font-zh-display);
  font-size: var(--t-meta);
  letter-spacing: 0.04em;
}
.work-extra-caption [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}

/* secondary — two columns of work cards */
.works-secondary {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 0;
  margin: 0;
}
@media (min-width: 720px) {
  .works-secondary { grid-template-columns: 1fr 1fr; }
}
.work-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: 18px;
  padding: clamp(24px, 3vw, 36px);
  display: flex;
  flex-direction: column;
  min-height: 240px;
  color: var(--ink);
  transition: border-color var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.work-card:hover {
  border-color: var(--rule);
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
}
.work-card .work-title {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  margin: 0 0 8px;
}
.work-card .work-title [data-lang-en] {
  font-size: 0.78em;
}
.work-kind {
  font-family: var(--font-sans-en);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 16px;
}
.work-kind [data-lang-en] { font-style: normal; }
.work-desc-sm {
  font-size: var(--t-body);
  color: var(--ink-soft);
  line-height: 1.6;
  margin: auto 0 18px;
  flex-grow: 1;
}
.work-desc-sm [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}
.work-arrow {
  position: absolute;
  bottom: clamp(20px, 3vw, 28px);
  right: clamp(20px, 3vw, 28px);
  font-family: var(--font-sans-en);
  font-size: 1.2rem;
  color: var(--ink-faint);
  transition: transform var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease);
}
.work-card:hover .work-arrow {
  transform: translateX(4px);
  color: var(--accent);
}

/* ---------- Contact ---------- */
.contact-mail {
  font-family: var(--font-zh-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  margin: 0 0 20px;
  letter-spacing: 0.005em;
  line-height: 1.2;
  font-weight: 500;
}
.contact-mail a {
  color: var(--ink);
  border: none;
}
.contact-mail a:hover {
  color: var(--accent);
}
.contact-extra {
  font-size: var(--t-meta);
  color: var(--ink-soft);
  margin: 0;
  letter-spacing: 0.04em;
}
.contact-extra [data-lang-en] {
  font-family: var(--font-en);
  font-style: italic;
}

/* ---------- Footer ---------- */
.site-foot {
  padding: clamp(40px, 6vw, 64px) var(--pad-x) clamp(32px, 5vw, 48px);
  border-top: 1px solid var(--rule-soft);
  font-family: var(--font-sans-en);
  font-size: var(--t-meta);
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}
.foot-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  justify-content: space-between;
  align-items: baseline;
}
.foot-inner p { margin: 0; }
.foot-inner [data-lang-zh] {
  font-family: var(--font-zh-body);
  letter-spacing: 0.02em;
}

/* ---------- Reveal animation (IntersectionObserver) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease),
              transform 0.7s var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* per-item stagger via inline --i custom prop, see reveal.js */
[data-reveal-group] [data-reveal] {
  transition-delay: calc(var(--i, 0) * 80ms);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- Tight phones ---------- */
@media (max-width: 380px) {
  :root { --pad-x: 18px; --nav-h: 52px; }
  .hero { min-height: calc(100svh - 52px); }
  .nav-brand [data-lang-en] { display: none; }
}

/* ---------- Print ---------- */
@media print {
  body { background: #fff; color: #000; }
  .nav { display: none; }
  .hero-scrollhint { display: none; }
  [data-lang-zh], [data-lang-en] { display: inline !important; }
}