/* ═══════════════════════════════════════════════════════════
   林砚 · 草木虫鱼 — 样式表
   设计方向：博物学手记（Naturalist's Plate）
   宣纸暖白 · 墨绿主调 · 朱砂点睛 · 细线分隔 · 竖排装饰
   ═══════════════════════════════════════════════════════════ */

:root {
  /* 颜色 —— 全部带色温，无纯黑纯白 */
  --paper:        oklch(96.5% 0.012 85);    /* 宣纸 */
  --paper-deep:   oklch(93.5% 0.018 82);    /* 纸张阴影 */
  --ink:          oklch(27% 0.022 145);     /* 墨色（偏绿的黑） */
  --ink-soft:     oklch(39% 0.028 145);    /* 次级文字 */
  --ink-faint:    oklch(53% 0.024 140);    /* 辅助文字 */
  --sage:         oklch(52% 0.075 150);     /* 墨绿主色 */
  --sage-deep:    oklch(38% 0.06  155);     /* 深绿 */
  --cinnabar:     oklch(52% 0.16  35);      /* 朱砂 */
  --rule:         oklch(80% 0.02  130);     /* 细线 */

  /* 字体 */
  --f-display: "Cormorant Garamond", "Noto Serif SC", serif;
  --f-body:    "Noto Serif SC", "Cormorant Garamond", serif;

  /* 间距 */
  --s-1: clamp(0.5rem, 0.4rem + 0.4vw, 0.75rem);
  --s-2: clamp(1rem, 0.8rem + 0.9vw, 1.6rem);
  --s-3: clamp(2rem, 1.5rem + 2.2vw, 3.8rem);
  --s-4: clamp(3.5rem, 2.5rem + 4.5vw, 7.5rem);
  --gutter: clamp(1.25rem, 0.8rem + 2.4vw, 4.5rem);

  /* 版心 */
  --measure: 1320px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-weight: 300;
  line-height: 1.85;
  letter-spacing: 0.015em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 纸纹：极轻的噪点，让底色不呆板 */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.45 0 0 0 0 0.42 0 0 0 0 0.36 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}

main, .site-head, .site-foot { position: relative; z-index: 1; }

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

em { font-family: var(--f-display); font-style: italic; letter-spacing: 0.02em; }

::selection { background: oklch(88% 0.06 140); }

/* ─────────── 页眉 ─────────── */

/* 横线只跨内容宽度，不越过版心边界 */
.rule-b, .rule-t { position: relative; }
.rule-b::after, .rule-t::before {
  content: "";
  position: absolute;
  left: var(--gutter); right: var(--gutter);
  height: 1px;
  background: var(--rule);
}
.rule-b::after { bottom: 0; }
.rule-t::before { top: 0; }

.site-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: var(--s-2);
  max-width: var(--measure); margin: 0 auto;
  padding: var(--s-2) var(--gutter);
}

.brand { display: flex; align-items: center; gap: 0.7em; text-decoration: none; color: inherit; }

.brand-seal {
  display: grid; place-items: center;
  width: 2.1em; height: 2.1em;
  background: var(--cinnabar);
  color: var(--paper);
  font-size: 0.95rem;
  border-radius: 3px;
  box-shadow: 0 1px 0 oklch(45% 0.15 35 / 0.4);
}

.brand-name { font-size: 1.05rem; letter-spacing: 0.14em; font-weight: 500; }
.brand-name em { font-size: 0.85em; color: var(--ink-faint); margin-left: 0.4em; }

.site-nav { display: flex; gap: clamp(1.4rem, 3.2vw, 3.4rem); }

.site-nav a {
  position: relative;
  color: var(--ink); text-decoration: none;
  font-size: 0.92rem; letter-spacing: 0.3em;
  padding-bottom: 0.25em;
}

.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: var(--cinnabar);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }

/* ─────────── 首屏 ─────────── */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--s-2);
  align-items: center;
  max-width: var(--measure); margin: 0 auto;
  padding: var(--s-3) var(--gutter) var(--s-3);
}

.hero-text { grid-column: 1 / 7; }

.eyebrow {
  font-size: 0.86rem; letter-spacing: 0.34em;
  color: var(--sage-deep);
  margin-bottom: var(--s-2);
}

.hero-title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(3.4rem, 2.2rem + 6.6vw, 8.2rem);
  line-height: 1.02;
  letter-spacing: 0.04em;
}
.hero-title .line { display: block; }
.hero-title .line:first-child { color: var(--sage-deep); }
.hero-title .indent { margin-left: clamp(1.5rem, 8vw, 6.5rem); color: var(--ink); }

.hero-latin {
  margin-top: var(--s-2);
  font-family: var(--f-display);
  font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.45rem);
  color: var(--ink-soft);
}

.hero-lede {
  margin-top: var(--s-2);
  max-width: 26em;
  font-size: clamp(1rem, 0.95rem + 0.3vw, 1.18rem);
  color: var(--ink-soft);
}

.hero-cta { margin-top: var(--s-3); }

.link-underline {
  color: var(--ink); text-decoration: none;
  letter-spacing: 0.18em; font-size: 0.95rem;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--cinnabar);
  transition: color 0.35s ease, border-color 0.35s ease;
}
.link-underline:hover, .link-underline:focus-visible { color: var(--cinnabar); }

.hero-plate {
  grid-column: 7 / 12;
  position: relative;
  margin-top: var(--s-3);
}

/* 画心：留白托裱效果 */
.hero-plate img {
  width: 100%;
  background: var(--paper-deep);
  padding: clamp(0.75rem, 2vw, 1.6rem);
  border: 1px solid oklch(72% 0.025 130);
  box-shadow: 0 24px 60px -32px oklch(30% 0.03 145 / 0.35);
}

.hero-plate figcaption {
  display: flex; align-items: baseline; gap: 1em;
  margin-top: 0.9em;
  font-size: 0.85rem; letter-spacing: 0.14em;
  color: var(--ink-faint);
}
.plate-no { color: var(--cinnabar); font-family: var(--f-display); font-style: italic; letter-spacing: 0.1em; }
.plate-title em { color: var(--ink-soft); }

/* 竖排装饰文字：与画心顶对齐，独占第十二列 */
.hero-vertical {
  grid-column: 12 / 13;
  align-self: start;
  justify-self: center;
  margin-top: var(--s-3);
  writing-mode: vertical-rl;
  font-size: 0.88rem;
  letter-spacing: 0.5em;
  line-height: 2;
  color: var(--ink-soft);
}

/* ─────────── 区块标题 ─────────── */
.section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  flex-wrap: wrap; gap: var(--s-2);
  max-width: var(--measure); margin: 0 auto;
  padding: 0 var(--gutter);
  padding-bottom: var(--s-1);
}

.section-head h2, .about-body h2, .site-foot h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(1.9rem, 1.5rem + 1.6vw, 3.1rem);
  letter-spacing: 0.06em;
}
.section-head h2 em, .about-body h2 em, .site-foot h2 em {
  font-size: 0.55em; color: var(--ink-faint); margin-left: 0.6em; letter-spacing: 0.12em;
}

/* ─────────── 筛选 ─────────── */
.filter { display: flex; gap: var(--s-1); }

.filter-btn {
  appearance: none; background: none;
  border: none; border-bottom: 1px solid transparent;
  font-family: var(--f-body); font-size: 0.92rem;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  padding: 0.35em 0.2em; cursor: pointer;
  transition: color 0.3s ease, border-color 0.3s ease;
}
.filter-btn:hover { color: var(--ink); }
.filter-btn.is-active { color: var(--cinnabar); border-bottom-color: var(--cinnabar); }

/* ─────────── 作品栅格（非对称编排） ─────────── */
.works { padding: var(--s-4) 0; }

.gallery {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 1rem + 2.4vw, 3.6rem) clamp(1.25rem, 1rem + 1.8vw, 3rem);
  max-width: var(--measure); margin: var(--s-3) auto 0;
  padding: 0 var(--gutter);
  align-items: start;
}

.work { cursor: pointer; outline: none; grid-column: span 4; }

/* 非对称编排：大一小一错落成行，每行留白位置不同（9 件一循环，作品增减自动循环） */
.work:nth-child(9n+1) { grid-column: 1 / span 7; }
.work:nth-child(9n+2) { grid-column: 9 / span 4; margin-top: var(--s-2); }
.work:nth-child(9n+3) { grid-column: 1 / span 4; }
.work:nth-child(9n+4) { grid-column: 6 / span 7; margin-top: calc(var(--s-3) * 0.3); }
.work:nth-child(9n+5) { grid-column: 2 / span 5; }
.work:nth-child(9n+6) { grid-column: 8 / span 5; margin-top: var(--s-2); }
.work:nth-child(9n+7) { grid-column: 1 / span 6; margin-top: calc(var(--s-3) * 0.25); }
.work:nth-child(9n+8) { grid-column: 8 / span 4; }
.work:nth-child(9n+9) { grid-column: 3 / span 8; }

/* 筛选态：统一三列，避免错位留洞 */
.gallery.is-filtered .work {
  grid-column: span 4;
  margin-top: 0;
}

.work-img {
  overflow: hidden;
  background: var(--paper-deep);
  border: 1px solid oklch(72% 0.025 130);
}
.work-img img {
  width: 100%;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1), filter 0.9s ease;
}
.work:hover .work-img img, .work:focus-visible .work-img img {
  transform: scale(1.035);
  filter: saturate(1.08);
}
.work:hover .work-img, .work:focus-visible .work-img {
  border-color: oklch(70% 0.04 145);
  box-shadow: 0 30px 60px -38px oklch(30% 0.03 145 / 0.5);
}

.work figcaption {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 0.9em;
  align-items: baseline;
  margin-top: 1em;
  padding-top: 0.8em;
  border-top: 1px solid var(--rule);
}

.work-no {
  grid-row: 1 / 4;
  align-self: start;
  padding-top: 0.35em;
  font-family: var(--f-display); font-style: italic;
  font-size: 0.95rem;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
}

.work h3 {
  font-weight: 500;
  font-size: clamp(1.15rem, 1.05rem + 0.5vw, 1.55rem);
  letter-spacing: 0.12em;
  line-height: 1.4;
}

.work-latin {
  font-family: var(--f-display); font-style: italic;
  font-size: 0.98rem;
  color: var(--sage-deep);
  letter-spacing: 0.05em;
}

.work-meta {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

/* 筛选淡出 */
.work.is-hidden { display: none; }

/* ─────────── 关于 ─────────── */
.about {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--s-3);
  max-width: var(--measure); margin: 0 auto;
  padding: var(--s-4) var(--gutter);
  align-items: start;
}

.about-aside { grid-column: 1 / 5; }
.about-aside img {
  width: 100%;
  border: 1px solid var(--rule);
  padding: clamp(0.6rem, 1.5vw, 1.2rem);
  background: var(--paper-deep);
}
.aside-note {
  margin-top: 0.9em;
  font-family: var(--f-display); font-style: italic;
  color: var(--ink-faint); font-size: 0.92rem;
  letter-spacing: 0.12em;
}

.about-body { grid-column: 6 / 13; }
.about-body h2 { margin-bottom: var(--s-2); }
.about-body p {
  max-width: 34em;
  margin-bottom: var(--s-2);
  font-size: clamp(1rem, 0.95rem + 0.3vw, 1.15rem);
  color: var(--ink-soft);
}

.about-body blockquote {
  margin-top: var(--s-3);
  padding-left: var(--s-2);
  border-left: 2px solid var(--cinnabar);
  font-family: var(--f-display);
  font-size: clamp(1.3rem, 1.1rem + 1vw, 1.9rem);
  line-height: 1.7;
  color: var(--sage-deep);
}

/* ─────────── 年表 ─────────── */
.exhibitions { padding-bottom: var(--s-4); }

.expo-list {
  list-style: none;
  max-width: var(--measure); margin: var(--s-2) auto 0;
  padding: 0 var(--gutter);
}

.expo-list li {
  display: grid;
  grid-template-columns: 8em minmax(0, 1.4fr) minmax(0, 1fr);
  gap: var(--s-1) var(--s-2);
  align-items: center;
  padding: var(--s-2) 0;
  border-bottom: 1px solid var(--rule);
  transition: background 0.4s ease, padding-left 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.expo-list li:hover { background: oklch(94% 0.014 85); padding-left: 0.8em; }

.expo-year {
  font-family: var(--f-display); font-style: italic;
  font-size: 1.25rem; color: var(--cinnabar);
}
.expo-name { letter-spacing: 0.1em; font-size: 1.05rem; }
.expo-place { color: var(--ink-soft); font-size: 0.9rem; letter-spacing: 0.14em; }

/* ─────────── 页脚 ─────────── */
.site-foot {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-3);
  align-items: start;
  max-width: var(--measure); margin: 0 auto;
  padding: var(--s-4) var(--gutter) var(--s-3);
}

.foot-lede {
  margin: var(--s-1) 0 var(--s-2);
  color: var(--ink-soft);
  letter-spacing: 0.08em;
}

.foot-contacts { list-style: none; display: grid; gap: 0.8em; }
.foot-contacts li { display: flex; gap: 1.6em; align-items: baseline; letter-spacing: 0.12em; }
.c-label {
  min-width: 3.4em;
  font-size: 0.82rem; letter-spacing: 0.3em;
  color: var(--ink-faint);
}
.foot-contacts a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--cinnabar); padding-bottom: 0.2em; }

.foot-seal {
  display: grid; place-items: center;
  width: clamp(4.4rem, 5.6vw, 5.8rem); height: clamp(4.4rem, 5.6vw, 5.8rem);
  background: var(--cinnabar);
  color: var(--paper);
  border-radius: 6px;
  font-size: clamp(1.15rem, 1.7vw, 1.5rem);
  line-height: 1.25;
  letter-spacing: 0.1em;
  text-align: center;
  transform: rotate(-3deg);
  box-shadow: 0 12px 28px -18px oklch(45% 0.15 35 / 0.45);
}

.copyright {
  grid-column: 1 / -1;
  margin-top: var(--s-3);
  padding-top: var(--s-2);
  border-top: 1px solid var(--rule);
  font-size: 0.82rem; letter-spacing: 0.14em;
  color: var(--ink-soft);
}

/* ─────────── 灯箱 ─────────── */
.lightbox {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  padding: var(--gutter);
  background: oklch(24% 0.02 145 / 0.92);
  opacity: 0;
  transition: opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.lightbox.is-open { opacity: 1; }
.lightbox[hidden] { display: none; }

.lb-close {
  position: absolute; top: 1.4rem; right: 1.8rem;
  appearance: none; background: none; border: none;
  color: oklch(92% 0.01 85); font-size: 2.4rem; line-height: 1;
  cursor: pointer;
  transition: transform 0.35s ease, color 0.35s ease;
}
.lb-close:hover { transform: rotate(90deg); color: var(--cinnabar); }

.lb-figure {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: var(--s-3);
  align-items: center;
  max-width: 1100px; width: 100%;
}
.lb-figure img {
  width: 100%; max-height: 78vh; object-fit: contain;
  background: var(--paper);
  padding: clamp(0.6rem, 1.6vw, 1.4rem);
}
.lb-figure figcaption { color: oklch(90% 0.012 85); }
.lb-no { font-family: var(--f-display); font-style: italic; color: oklch(72% 0.12 35); letter-spacing: 0.12em; }
.lb-title { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 500; letter-spacing: 0.14em; margin: 0.35em 0; }
.lb-latin { font-family: var(--f-display); font-style: italic; font-size: 1.15rem; color: oklch(80% 0.06 150); }
.lb-meta { margin-top: 1.2em; font-size: 0.92rem; letter-spacing: 0.16em; color: oklch(75% 0.015 85); }

/* ─────────── 入场动效 ─────────── */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--d, 0s);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .work-img img, .lightbox { transition: none; }
}

/* ─────────── 响应式 ─────────── */
@media (max-width: 900px) {
  .hero { padding-top: var(--s-3); }
  .hero-text { grid-column: 1 / 13; }
  .hero-plate { grid-column: 1 / 13; margin-top: var(--s-3); }
  .hero-vertical { display: none; }

  .work,
  .gallery.is-filtered .work {
    grid-column: 1 / -1;
  }
  .work:nth-child(n) { margin-top: 0; }

  .about-aside { grid-column: 1 / 13; }
  .about-body { grid-column: 1 / 13; }

  .expo-list li { grid-template-columns: 5.5em 1fr; }
  .expo-place { grid-column: 2; }

  .site-foot { grid-template-columns: 1fr; }
  .foot-seal { justify-self: start; }

  .lb-figure { grid-template-columns: 1fr; gap: var(--s-2); }
  .lb-figure img { max-height: 56vh; }
}

@media (max-width: 560px) {
  .site-head { flex-direction: column; align-items: flex-start; gap: var(--s-1); }
  .site-nav { gap: 1.4rem; }
  .hero-title { font-size: clamp(3.2rem, 17vw, 5rem); }
  .filter-btn { letter-spacing: 0.16em; }
}