/* =========================================================
   刘华新 · LIU HUAXIN — 作品集网站样式
   设计基调：纸白 / 墨黑 / 低饱和蓝绿，大字号衬线 + 小号无衬线标签
   ========================================================= */

/* ---------- 1. Tokens ---------- */
:root {
  --paper: #f6f3ec;
  --paper-2: #efece3;
  --paper-3: #e6e1d5;
  --ink: #1a1b1c;
  --ink-2: #403f3b;
  --ink-3: #6d6a62;
  --muted: #8f8a7e;
  --line: rgba(26, 27, 28, 0.14);
  --line-soft: rgba(26, 27, 28, 0.08);
  --accent: #34535f;

  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "Noto Serif SC",
    STSong, "SimSun", "Georgia", serif;
  --latin: "Cormorant Garamond", "EB Garamond", "Georgia", "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --gutter: clamp(1.25rem, 4.5vw, 4.5rem);
  --max: 1560px;
  --header-h: 4.5rem;
  --ease: cubic-bezier(0.22, 0.68, 0.16, 1);
}

/* ---------- 2. Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

:focus-visible {
  outline: 1px solid var(--ink);
  outline-offset: 4px;
}

/* ---------- 3. Type helpers ---------- */
.label {
  font-family: var(--sans);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.label--paper {
  color: rgba(246, 243, 236, 0.78);
}

.serif {
  font-family: var(--serif);
  font-weight: 500;
}

.num {
  font-family: var(--latin);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.hr {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

/* ---------- 4. Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0 var(--gutter);
  color: var(--ink);
  background: rgba(246, 243, 236, 0.88);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.5s var(--ease), color 0.35s var(--ease),
    border-color 0.5s var(--ease);
}

body.hero-mode .site-header {
  background: transparent;
  border-bottom-color: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  color: var(--paper);
  text-shadow: 0 1px 24px rgba(10, 12, 14, 0.45);
}

body.hero-mode .site-header.is-scrolled {
  background: rgba(246, 243, 236, 0.92);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom-color: var(--line-soft);
  color: var(--ink);
  text-shadow: none;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  font-family: var(--serif);
  font-size: 1.0625rem;
  letter-spacing: 0.24em;
  white-space: nowrap;
}

.brand small {
  font-family: var(--sans);
  font-size: 0.5625rem;
  letter-spacing: 0.28em;
  color: currentColor;
  opacity: 0.55;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 2.4vw, 2.4rem);
}

.nav a {
  position: relative;
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  padding: 0.35rem 0;
  opacity: 0.85;
  transition: opacity 0.3s var(--ease);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease);
}

.nav a:hover {
  opacity: 1;
}

.nav a:hover::after,
.nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav a[aria-current="page"] {
  opacity: 1;
}

.nav .nav-en {
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  opacity: 0.4;
  margin-left: 0.25rem;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  margin-right: -0.6rem;
  position: relative;
  z-index: 102;
}

.nav-toggle span {
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  height: 1px;
  background: currentColor;
  transition: transform 0.45s var(--ease), opacity 0.3s var(--ease);
}

.nav-toggle span:nth-child(1) {
  top: 1.05rem;
}
.nav-toggle span:nth-child(2) {
  top: 1.45rem;
}
.nav-toggle span:nth-child(3) {
  top: 1.85rem;
}

body.menu-open .nav-toggle span:nth-child(1) {
  transform: translateY(0.4rem) rotate(45deg);
}
body.menu-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}
body.menu-open .nav-toggle span:nth-child(3) {
  transform: translateY(-0.4rem) rotate(-45deg);
}

/* ---------- 5. Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  isolation: isolate;
  background: #23262a;
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 42%;
  filter: saturate(1.02) brightness(0.94);
  animation: heroIn 2.6s var(--ease) both;
}

@keyframes heroIn {
  from {
    transform: scale(1.06);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(
      130% 95% at 0% 100%,
      rgba(8, 10, 12, 0.66) 0%,
      rgba(8, 10, 12, 0.32) 42%,
      rgba(8, 10, 12, 0) 68%
    ),
    linear-gradient(
      180deg,
      rgba(10, 12, 14, 0.6) 0%,
      rgba(10, 12, 14, 0.3) 14%,
      rgba(10, 12, 14, 0.05) 34%,
      rgba(10, 12, 14, 0) 46%,
      rgba(10, 12, 14, 0.34) 68%,
      rgba(10, 12, 14, 0.72) 86%,
      rgba(10, 12, 14, 0.82) 100%
    );
}

/* hero 文字入场：纯 CSS，不依赖 JS */
.hero__rise {
  animation: heroRise 1.15s var(--ease) both;
}

.hero__rise--late {
  animation-delay: 0.28s;
}

@keyframes heroRise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero__inner {
  position: relative;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(2.5rem, 6vh, 4.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 2rem 3rem;
  color: var(--paper);
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: clamp(1rem, 2.4vh, 1.6rem);
  color: rgba(246, 243, 236, 0.8);
}

.hero__eyebrow::before {
  content: "";
  width: clamp(1.6rem, 5vw, 3.4rem);
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.hero__title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(3.2rem, 11.5vw, 9.5rem);
  line-height: 0.98;
  letter-spacing: 0.1em;
  text-indent: 0.1em;
  text-shadow: 0 2px 46px rgba(10, 12, 14, 0.4), 0 1px 8px rgba(10, 12, 14, 0.18);
}

.hero__title-en {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--sans);
  font-size: clamp(0.625rem, 1.1vw, 0.8125rem);
  font-weight: 400;
  letter-spacing: 0.55em;
  text-indent: 0.55em;
  opacity: 0.7;
}

.hero__sub {
  margin: 1.6rem 0 0;
  max-width: 30ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: rgba(246, 243, 236, 0.88);
  text-shadow: 0 1px 20px rgba(10, 12, 14, 0.35);
}

.hero__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1.4rem;
  text-align: right;
  padding-bottom: 0.4rem;
}

.hero__count {
  font-family: var(--latin);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: rgba(246, 243, 236, 0.6);
}

.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(246, 243, 236, 0.82);
}

.scroll-cue i {
  display: block;
  width: 1px;
  height: 2.6rem;
  background: currentColor;
  opacity: 0.5;
  transform-origin: top;
  animation: cue 2.4s var(--ease) infinite;
}

@keyframes cue {
  0%,
  100% {
    transform: scaleY(0.35);
    opacity: 0.35;
  }
  50% {
    transform: scaleY(1);
    opacity: 0.8;
  }
}

/* ---------- 6. Sections ---------- */
.section {
  padding: clamp(4rem, 9vw, 8.5rem) 0;
}

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  flex-wrap: wrap;
  margin-bottom: clamp(2rem, 4.5vw, 3.6rem);
}

.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  letter-spacing: 0.12em;
  line-height: 1.3;
}

.section-head h2 .en {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--sans);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.4s var(--ease), gap 0.4s var(--ease);
}

.link-more:hover {
  border-color: var(--ink);
  gap: 1rem;
}

/* ---------- 7. Featured grid (首页精选) ---------- */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3.2vw, 3.2rem) clamp(1.2rem, 2.6vw, 2.8rem);
  align-items: start;
}

.featured-grid > *:nth-child(2),
.featured-grid > *:nth-child(5) {
  margin-top: clamp(2rem, 5vw, 5rem);
}

/* ---------- 8. Work card ---------- */
.work-card {
  display: block;
  position: relative;
}

.work-card__frame {
  position: relative;
  background: var(--paper-2);
  overflow: hidden;
}

.work-card__frame img {
  width: 100%;
  height: auto;
  transition: transform 1.4s var(--ease), filter 1s var(--ease);
}

.work-card:hover .work-card__frame img {
  transform: scale(1.035);
}

.work-card__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid transparent;
  transition: border-color 0.5s var(--ease);
}

.work-card:hover .work-card__meta {
  border-top-color: var(--line);
}

.work-card__title {
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.work-card__sub {
  margin-top: 0.15rem;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.work-card__year {
  font-family: var(--latin);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--ink-3);
  flex: none;
}

/* ---------- 9. Works index ---------- */
.page-head {
  padding: calc(var(--header-h) + clamp(3rem, 8vw, 6.5rem)) 0 clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}

.page-head__row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  flex-wrap: wrap;
}

.page-head h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.2rem, 6vw, 4.4rem);
  letter-spacing: 0.14em;
  line-height: 1.1;
}

.page-head h1 .en {
  display: block;
  margin-top: 0.9rem;
  font-family: var(--sans);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.42em;
  color: var(--muted);
}

.page-head p {
  margin: 0;
  max-width: 44ch;
  font-size: 0.875rem;
  line-height: 1.95;
  color: var(--ink-3);
}

.filters {
  display: flex;
  align-items: center;
  gap: 0.35rem 0.5rem;
  flex-wrap: wrap;
  padding: 1.4rem 0;
  position: sticky;
  top: var(--header-h);
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line-soft);
}

.filters__label {
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  color: var(--muted);
  margin-right: 0.9rem;
  text-transform: uppercase;
}

.chip {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 0.4rem 0.85rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--ink-3);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease),
    background 0.3s var(--ease);
  font-variant-numeric: tabular-nums;
}

.chip:hover {
  color: var(--ink);
  border-color: var(--line);
}

.chip.is-active {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(2rem, 4.5vw, 4rem) clamp(1.2rem, 2.6vw, 2.8rem);
  padding: clamp(2rem, 4vw, 3.4rem) 0 clamp(4rem, 8vw, 7rem);
  align-items: start;
}

.works-grid .work-card.is-hidden {
  display: none;
}

.empty-note {
  padding: 4rem 0;
  font-size: 0.875rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}

/* ---------- 9b. Series links（作品页的系列入口） ---------- */
.series-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  padding: 1.3rem 0 0.3rem;
}

.chip--link {
  color: var(--ink-2);
  border-color: var(--line-soft);
}

.chip--link:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.chip .n {
  display: inline-block;
  margin-left: 0.45rem;
  font-family: var(--latin);
  font-size: 0.875em;
  opacity: 0.5;
}

/* ---------- 9c. Series cards ---------- */
.series-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.2rem, 2.6vw, 2.6rem);
  align-items: start;
}

.series-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(2rem, 4vw, 3.6rem) clamp(1.2rem, 2.6vw, 2.6rem);
  padding: clamp(2rem, 4vw, 3.2rem) 0 clamp(2rem, 4vw, 3.4rem);
  align-items: start;
}

.series-card {
  display: block;
}

.series-card__cover {
  position: relative;
  background: var(--paper-2);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  display: flex;
  align-items: center;
  justify-content: center;
}

.series-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.4s var(--ease);
}

.series-card:hover .series-card__cover img {
  transform: scale(1.04);
}

.series-card__n {
  position: absolute;
  right: 0.75rem;
  bottom: 0.6rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: rgba(246, 243, 236, 0.92);
  text-shadow: 0 1px 10px rgba(10, 12, 14, 0.6);
}

.series-card__meta {
  padding-top: 0.9rem;
  border-top: 1px solid transparent;
  transition: border-color 0.5s var(--ease);
}

.series-card:hover .series-card__meta {
  border-top-color: var(--line);
}

.series-card__meta h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.series-card__meta .en {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.5625rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

.series-card__meta .cnt {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.series-foot {
  padding: 0.5rem 0 clamp(3.5rem, 7vw, 6rem);
  font-size: 0.8125rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.series-foot a {
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.15rem;
}

.series-foot a:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.works-grid--series {
  padding-top: clamp(2.4rem, 5vw, 4rem);
}

/* ---------- 9d. Installation views ---------- */
.install-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 4vw, 3.6rem) clamp(1.2rem, 2.6vw, 2.6rem);
  padding: clamp(2.4rem, 5vw, 4rem) 0 0;
  align-items: start;
}

.install-item {
  margin: 0;
  cursor: zoom-in;
}

.install-item.is-wide {
  grid-column: 1 / -1;
}

.install-item__frame {
  background: var(--paper-2);
  overflow: hidden;
}

.install-item__frame img {
  width: 100%;
  height: auto;
  transition: transform 1.6s var(--ease), filter 1s var(--ease);
}

.install-item:hover .install-item__frame img {
  transform: scale(1.02);
}

.install-item__cap {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding-top: 0.85rem;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.install-item__cap .num {
  font-size: 0.6875rem;
  color: var(--muted);
}

.install-item__cap .t {
  font-family: var(--serif);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.install-item__cap .c {
  margin-left: auto;
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* 首页：现场照片通栏 */
.install-strip {
  position: relative;
}

.install-strip__link {
  position: relative;
  display: block;
  height: clamp(20rem, 54vh, 36rem);
  overflow: hidden;
  background: #23262a;
}

.install-strip__link img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 46%;
  filter: brightness(0.9);
  transition: transform 2s var(--ease), filter 1s var(--ease);
}

.install-strip__link:hover img {
  transform: scale(1.025);
  filter: brightness(0.92);
}

.install-strip__cap {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: clamp(1.4rem, 4vw, 3rem);
  z-index: 1;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  color: var(--paper);
}

.install-strip__cap .t {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 2vw, 1.6rem);
  letter-spacing: 0.14em;
}

.install-strip__link::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 12, 14, 0.35) 0%,
    rgba(10, 12, 14, 0) 40%,
    rgba(10, 12, 14, 0.6) 100%
  );
  pointer-events: none;
}

/* ---------- 10. Work detail ---------- */
.work-detail {
  padding-top: calc(var(--header-h) + clamp(2rem, 5vw, 4rem));
}

.work-detail__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 24rem);
  gap: clamp(1.5rem, 4vw, 4.5rem);
  align-items: start;
}

.work-detail__stage {
  background: var(--paper-2);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 3vw, 2.6rem);
  min-height: 40vh;
}

.work-detail__stage img {
  max-width: 100%;
  max-height: min(78vh, 60rem);
  width: auto;
  height: auto;
  box-shadow: 0 24px 60px -30px rgba(20, 24, 26, 0.5);
}

.work-detail__info {
  position: sticky;
  top: calc(var(--header-h) + 2.4rem);
  padding-top: 0.4rem;
}

.work-detail__index {
  font-family: var(--latin);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.work-detail__title {
  margin: 0.9rem 0 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  letter-spacing: 0.1em;
  line-height: 1.35;
}

.spec {
  margin: 2rem 0 0;
  border-top: 1px solid var(--line);
}

.spec div {
  display: flex;
  justify-content: space-between;
  gap: 1.4rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.8125rem;
}

.spec dt,
.spec .k {
  color: var(--muted);
  letter-spacing: 0.16em;
  flex: none;
}

.spec .v {
  text-align: right;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.work-detail__note {
  margin-top: 2rem;
  font-size: 0.75rem;
  line-height: 1.9;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.work-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: clamp(3rem, 6vw, 5rem) 0 0;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.work-nav a {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.4rem 0;
  background: var(--paper);
  transition: background 0.4s var(--ease);
}

.work-nav a:hover {
  background: var(--paper-2);
}

.work-nav a.next {
  justify-content: flex-end;
  text-align: right;
  padding-right: var(--gutter);
}

.work-nav a.prev {
  padding-left: var(--gutter);
}

.work-nav img {
  width: 3.6rem;
  height: 3.6rem;
  object-fit: cover;
  flex: none;
  filter: saturate(0.9);
}

.work-nav .t {
  font-family: var(--serif);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
}

.work-nav .d {
  display: block;
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-bottom: 0.2rem;
  text-transform: uppercase;
}

/* ---------- 11. Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: rgba(14, 15, 16, 0.985);
  color: var(--paper);
  padding: 1.2rem var(--gutter);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s var(--ease), visibility 0.45s;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(246, 243, 236, 0.65);
}

.lightbox__close {
  font-size: 1.6rem;
  line-height: 1;
  padding: 0.2rem 0.5rem;
  color: inherit;
}

.lightbox__stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  position: relative;
}

.lightbox__stage img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.9);
}

.lightbox__cap {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.lightbox__cap .t {
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.1em;
}

.lightbox__cap a {
  color: rgba(246, 243, 236, 0.62);
  border-bottom: 1px solid rgba(246, 243, 236, 0.28);
  padding-bottom: 0.1rem;
}

.lightbox__cap a:hover {
  color: var(--paper);
}

.lb-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  color: rgba(246, 243, 236, 0.7);
  font-size: 1.4rem;
  transition: color 0.3s var(--ease), background 0.3s var(--ease);
}

.lb-btn:hover {
  color: var(--paper);
  background: rgba(246, 243, 236, 0.08);
}

.lb-btn.prev {
  left: -0.6rem;
}
.lb-btn.next {
  right: -0.6rem;
}

/* ---------- 12. About block (首页) ---------- */
.about-block {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
}

.about-block__media {
  position: relative;
  background: var(--paper-2);
}

.about-block__media img {
  width: 100%;
  height: auto;
}

.about-block__caption {
  margin-top: 0.7rem;
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.about-block h2 {
  margin: 0 0 1.6rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: 0.14em;
  line-height: 1.35;
}

.about-block h2 .en {
  display: block;
  margin-top: 0.65rem;
  font-family: var(--sans);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.about-block p {
  margin: 0 0 1.1rem;
  font-size: 0.9375rem;
  line-height: 2.05;
  color: var(--ink-2);
  max-width: 42ch;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
  margin-top: 2.4rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
}

.facts dt {
  font-size: 0.5625rem;
  letter-spacing: 0.24em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.45rem;
}

.facts dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

/* ---------- 13. Exhibition rows ---------- */
.ex-list {
  border-top: 1px solid var(--line);
}

.ex-row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) auto;
  gap: 1rem 2rem;
  align-items: baseline;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.4s var(--ease), padding-left 0.5s var(--ease);
}

.ex-row:hover {
  background: var(--paper-2);
  padding-left: 0.6rem;
}

.ex-row__year {
  font-family: var(--latin);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.ex-row__title {
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.ex-row__venue {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
}

.ex-cta {
  margin-top: 2rem;
}

/* ---------- 14. CTA band ---------- */
.cta {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
}

.cta__inner {
  padding-top: clamp(3.5rem, 8vw, 6.5rem);
  padding-bottom: clamp(3.5rem, 8vw, 6.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 2rem 3rem;
}

.cta h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 4vw, 3.2rem);
  letter-spacing: 0.12em;
  line-height: 1.35;
}

.cta p {
  margin: 1rem 0 0;
  max-width: 38ch;
  font-size: 0.875rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

.cta__mail {
  display: inline-block;
  font-family: var(--latin);
  font-size: clamp(1.05rem, 2vw, 1.5rem);
  letter-spacing: 0.06em;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--ink);
}

.cta__mail:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ---------- 15. Footer ---------- */
.site-footer {
  padding: clamp(2.5rem, 5vw, 4rem) 0 2rem;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 2rem 3rem;
  align-items: start;
}

.footer-brand {
  font-family: var(--serif);
  font-size: 1.125rem;
  letter-spacing: 0.24em;
}

.footer-brand span {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--sans);
  font-size: 0.5625rem;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.footer-col h3 {
  margin: 0 0 0.9rem;
  font-size: 0.5625rem;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-col p,
.footer-col a {
  margin: 0 0 0.3rem;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--ink-2);
  display: block;
}

.footer-col a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.footer-bottom {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* ---------- 16. Exhibitions page ---------- */
.ex-page {
  padding-bottom: clamp(4rem, 8vw, 7rem);
}

.ex-section {
  display: grid;
  grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
  gap: 2rem clamp(2rem, 5vw, 5rem);
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  border-top: 1px solid var(--line);
}

.ex-section__head h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  letter-spacing: 0.14em;
}

.ex-section__head .en {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--sans);
  font-size: 0.5625rem;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.ex-section__head p {
  margin: 1rem 0 0;
  font-size: 0.75rem;
  line-height: 1.9;
  color: var(--muted);
}

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

.timeline li {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr) auto;
  gap: 0.6rem 1.6rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}

.timeline li:first-child {
  border-top: 1px solid var(--line-soft);
}

.timeline .y {
  font-family: var(--latin);
  font-size: 0.875rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.timeline .t {
  font-family: var(--serif);
  font-size: 0.9688rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
}

.timeline .v {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-align: right;
}

/* ---------- 17. About page ---------- */
.about-page {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  padding: clamp(2.5rem, 5vw, 4rem) 0;
}

.about-page__text p {
  margin: 0 0 1.3rem;
  font-size: 1rem;
  line-height: 2.15;
  color: var(--ink-2);
  max-width: 46ch;
}

.about-page__text p.lead {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 2;
  color: var(--ink);
  letter-spacing: 0.03em;
}

.about-page__media {
  background: var(--paper-2);
}

.about-page__media img {
  width: 100%;
  height: auto;
}

.placeholder-note {
  display: inline-flex;
  gap: 0.5rem;
  align-items: baseline;
  margin-top: 1.2rem;
  padding: 0.5rem 0.8rem;
  font-size: 0.6875rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  background: var(--paper-2);
  border: 1px dashed var(--line);
}

/* ---------- 18. Reveal ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 1s var(--ease), transform 1.1s var(--ease);
  transition-delay: var(--d, 0ms);
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
  .hero__media img,
  .hero__rise,
  .scroll-cue i {
    animation: none;
  }
}

/* ---------- 19. Responsive ---------- */
@media (max-width: 1080px) {
  .featured-grid,
  .works-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .series-row,
  .series-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .install-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .featured-grid > *:nth-child(2),
  .featured-grid > *:nth-child(5) {
    margin-top: 0;
  }
  .about-block {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
  }
  .work-detail__inner {
    grid-template-columns: minmax(0, 1fr);
  }
  .work-detail__info {
    position: static;
    padding-top: 0;
  }
  .about-page {
    grid-template-columns: minmax(0, 1fr);
  }
  .about-page__media {
    order: -1;
    max-width: 32rem;
  }
  .ex-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.4rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 1120px) {
  /* 导航项变多后，中等宽度隐藏英文副标，避免挤压 */
  .nav .nav-en {
    display: none;
  }
  .nav {
    gap: clamp(0.9rem, 1.8vw, 1.6rem);
  }
}

@media (max-width: 820px) {
  :root {
    --header-h: 4rem;
  }
  .nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 0 var(--gutter);
    gap: 0.4rem;
    background: var(--paper);
    color: var(--ink);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.4s var(--ease), transform 0.5s var(--ease),
      visibility 0.4s;
    z-index: 101;
  }
  body.menu-open .nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  body.menu-open .site-header {
    background: transparent;
    color: var(--ink);
    border-bottom-color: transparent;
    text-shadow: none;
  }
  .nav a {
    font-family: var(--serif);
    font-size: clamp(1.6rem, 7vw, 2.4rem);
    letter-spacing: 0.1em;
    padding: 0.5rem 0;
    opacity: 1;
  }
  .nav a .nav-en {
    font-size: 0.625rem;
    letter-spacing: 0.24em;
    margin-left: 0.6rem;
  }
  .nav-toggle {
    display: block;
  }
  .hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.6rem;
  }
  .hero__aside {
    align-items: flex-start;
    text-align: left;
  }
  .featured-grid,
  .works-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.2rem;
  }
  .series-row,
  .series-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.6rem 1rem;
  }
  .install-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.8rem;
  }
  .install-item.is-wide {
    grid-column: auto;
  }
  .install-item__cap {
    flex-wrap: wrap;
  }
  .about-block {
    grid-template-columns: minmax(0, 1fr);
  }
  .facts {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .ex-row {
    grid-template-columns: 4rem minmax(0, 1fr);
    row-gap: 0.2rem;
  }
  .ex-row__venue {
    grid-column: 2;
    text-align: left;
    white-space: normal;
  }
  .cta__inner {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.8rem;
  }
  .work-nav {
    grid-template-columns: minmax(0, 1fr);
  }
  .work-nav a.next {
    justify-content: flex-start;
    text-align: left;
    padding-left: var(--gutter);
    border-top: 1px solid var(--line);
  }
  .timeline li {
    grid-template-columns: 3.6rem minmax(0, 1fr);
  }
  .timeline .v {
    grid-column: 2;
    text-align: left;
  }
  .filters {
    top: var(--header-h);
    margin: 0 calc(var(--gutter) * -1);
    padding: 1rem var(--gutter);
  }
  .lightbox {
    padding: 1rem 1rem 1.4rem;
  }
  .lb-btn.prev {
    left: 0;
  }
  .lb-btn.next {
    right: 0;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .hero__title {
    letter-spacing: 0.06em;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }
}