/* ============================================================
   無盡藏 · 主样式
   设计基因：宣纸白底 × 玄墨压缩大字 × 矿物颜料点睛（朱砂/石青/石绿/泥金）
   流式尺寸基准 1800px（参考站同款公式 max(px, unit/1800*100vw)）
   ============================================================ */

:root {
  --paper: #faf9f6;
  --paper-deep: #f1efe9;
  --ink: #17130e;
  --ink-soft: #4a443b;
  --cinnabar: #a63a25;      /* 朱砂：只用于印章与点睛 */
  --azurite: #2b4a6b;       /* 石青 */
  --malachite: #57705f;     /* 石绿 */
  --gold: #b08d46;          /* 泥金 */
  --hairline: rgba(23, 19, 14, .14);

  --bsw: 1800;
  --pad: max(20px, calc(40 / var(--bsw) * 100vw));
  --t-hero: max(64px, calc(230 / var(--bsw) * 100vw));
  --t-big: max(40px, calc(120 / var(--bsw) * 100vw));
  --t-med: max(22px, calc(44 / var(--bsw) * 100vw));
  --t-info: max(10px, calc(12 / var(--bsw) * 100vw));
  --t-body: max(15px, calc(17 / var(--bsw) * 100vw));

  --f-display: "Noto Serif TC", "Noto Serif SC", serif;
  --f-latin: "Oswald", "Arial Narrow", sans-serif;
  --f-mono: "IBM Plex Mono", monospace;
  --f-body: "Noto Serif TC", "Noto Serif SC", serif;

  --ease-brush: cubic-bezier(.22, 1, .36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scrollbar-width: thin; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: var(--t-body);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; height: 100vh; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
::selection { background: var(--cinnabar); color: var(--paper); }

:focus-visible { outline: 2px solid var(--cinnabar); outline-offset: 3px; }

/* ---------- 通用文字角色 ---------- */
.t-info {
  font-family: var(--f-latin);
  font-size: var(--t-info);
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  line-height: 1.5;
}
.t-mono {
  font-family: var(--f-mono);
  font-size: var(--t-info);
  letter-spacing: .05em;
}
.t-display {
  font-family: var(--f-display);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: .04em;
}

/* ---------- 加载器 ---------- */
.loader {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--paper);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2rem;
}
.loader-num {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: var(--t-med);
  letter-spacing: .3em;
  color: var(--ink);
}
.loader-seal {
  width: max(72px, calc(96 / var(--bsw) * 100vw));
  height: max(72px, calc(96 / var(--bsw) * 100vw));
  border: 2px solid var(--cinnabar);
  color: var(--cinnabar);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--f-display); font-weight: 900;
  font-size: max(20px, calc(30 / var(--bsw) * 100vw));
  writing-mode: vertical-rl;
  letter-spacing: .2em;
  transform: scale(1.6) rotate(8deg);
  opacity: 0;
}
.loader-bar {
  position: absolute; bottom: 0; left: 0;
  height: 2px; width: 0%;
  background: var(--ink);
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  display: flex; align-items: baseline; justify-content: space-between;
  padding: calc(var(--pad) * .6) var(--pad);
  /* difference 混合：纸底上呈墨色，压到黑色卷轴段落自动反白 */
  mix-blend-mode: difference;
  color: #e8e5df;
}
.nav a { color: inherit; }
.nav-logo em { color: inherit; }
.nav-logo {
  font-family: var(--f-display); font-weight: 900;
  font-size: max(18px, calc(26 / var(--bsw) * 100vw));
  letter-spacing: .18em;
}
.nav-links { display: flex; gap: 2.4em; align-items: baseline; }
.nav-links a { position: relative; padding-bottom: 2px; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right;
  transition: transform .5s var(--ease-brush);
}
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); transform-origin: left; }

/* ---------- 主页 hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 var(--pad);
  overflow: hidden;
}
#fluid-canvas {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.hero-title {
  font-size: var(--t-hero);
  display: flex; gap: .06em;
}
.hero-title span { display: inline-block; }
.hero-sub {
  margin-top: 1.6em;
  display: flex; flex-wrap: wrap; gap: .6em 3em;
  color: var(--ink-soft);
}
.hero-quote {
  position: absolute; right: var(--pad); top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--f-display); font-weight: 700;
  font-size: var(--t-med);
  letter-spacing: .5em;
  color: var(--ink);
  opacity: .92;
  z-index: 1;
}
.hero-quote small {
  font-size: .38em; font-weight: 400;
  letter-spacing: .3em; color: var(--ink-soft);
  margin-top: 2.5em;
}
.hero-hint {
  position: absolute; bottom: calc(var(--pad) * .8); left: var(--pad);
  z-index: 1; color: var(--ink-soft);
}

/* ---------- 跑马灯经文 ---------- */
.marquee {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden; white-space: nowrap;
  padding: .55em 0;
}
.marquee-track { display: inline-flex; gap: 4em; will-change: transform; }
.marquee-track span {
  font-family: var(--f-display); font-weight: 700;
  font-size: max(14px, calc(20 / var(--bsw) * 100vw));
  letter-spacing: .5em; color: var(--ink-soft);
}
.marquee-track b { color: var(--cinnabar); font-weight: 700; }

/* ---------- 展卷（朝元图横向卷轴）---------- */
.scroll-sec { position: relative; }
.scroll-head {
  padding: calc(var(--pad) * 3) var(--pad) calc(var(--pad) * 1.5);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1em var(--pad);
  align-items: end;
}
.sec-eyebrow { color: var(--cinnabar); margin-bottom: 1.2em; }
.sec-title { font-size: var(--t-big); }
.scroll-meta { text-align: right; color: var(--ink-soft); max-width: 34em; }
.scroll-meta .zh { font-family: var(--f-display); margin-top: .8em; line-height: 2; }
.scroll-stage { position: relative; height: 100vh; overflow: hidden; background: var(--ink); }
.scroll-strip {
  position: absolute; top: 50%; left: 0;
  transform: translateY(-50%);
  display: flex; height: 78vh;
  will-change: transform;
}
.scroll-strip img { height: 100%; width: auto; flex: none; user-select: none; -webkit-user-drag: none; }
.scroll-progress {
  position: absolute; bottom: 5vh; left: var(--pad); right: var(--pad);
  height: 1px; background: rgba(250, 249, 246, .25);
}
.scroll-progress i {
  position: absolute; left: 0; top: -1px; height: 3px; width: 0%;
  background: var(--gold); display: block;
}
.scroll-label {
  position: absolute; top: 9vh; left: var(--pad);
  color: var(--paper); opacity: .8; z-index: 2;
}
.scroll-label-r {
  position: absolute; top: 9vh; right: var(--pad);
  color: var(--paper); opacity: .8; z-index: 2;
}

/* ---------- 四壁画廊 ---------- */
.gallery { padding: calc(var(--pad) * 3) var(--pad); }
.gallery-head { display: flex; justify-content: space-between; align-items: end; margin-bottom: calc(var(--pad) * 2); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  column-gap: calc(6 / var(--bsw) * 100vw + 2vw);
  row-gap: max(80px, 9vw);
  align-items: end;
}
.work { position: relative; cursor: pointer; }
.work:nth-child(1) { grid-column: 1 / span 4; }
.work:nth-child(2) { grid-column: 5 / span 2; margin-bottom: 14vw; }
.work:nth-child(3) { grid-column: 2 / span 4; margin-top: -6vw; }
.work:nth-child(4) { grid-column: 1 / span 2; margin-top: 3vw; }
.work-img { position: relative; overflow: hidden; background: var(--paper-deep); }
.work-img img {
  width: 100%; height: auto;
  transform: scale(1.04);
  transition: transform 1.2s var(--ease-brush), filter 1.2s var(--ease-brush);
}
.work:hover .work-img img { transform: scale(1.0); }
.work-cap {
  display: flex; justify-content: space-between; gap: 1em;
  margin-top: .9em; align-items: baseline;
}
.work-cap .zh { font-family: var(--f-display); font-weight: 700; font-size: max(15px, calc(21 / var(--bsw) * 100vw)); letter-spacing: .1em; }
.work-cap .t-info { color: var(--ink-soft); text-align: right; }
.work-num {
  position: absolute; top: -1.6em; left: 0;
  font-family: var(--f-mono); font-size: var(--t-info); color: var(--cinnabar);
}

/* ---------- 灯箱 ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(23, 19, 14, .96);
  display: none;
  color: var(--paper);
}
.lightbox.open { display: block; }
.lightbox-scroll {
  position: absolute; inset: 0;
  overflow: auto;
  display: flex; align-items: center;
  scrollbar-width: none;
}
.lightbox-scroll::-webkit-scrollbar { display: none; }
.lightbox-scroll img { max-height: 86vh; width: auto; margin: auto; padding: 0 6vw; }
.lightbox-cap {
  position: absolute; bottom: 3vh; left: var(--pad); right: var(--pad);
  display: flex; justify-content: space-between; gap: 2em; align-items: baseline;
  pointer-events: none;
}
.lightbox-close {
  position: absolute; top: 2.5vh; right: var(--pad); z-index: 2;
  background: none; border: 1px solid rgba(250, 249, 246, .4);
  color: var(--paper); font-family: var(--f-latin);
  letter-spacing: .2em; font-size: var(--t-info);
  padding: .7em 1.4em; cursor: pointer; text-transform: uppercase;
}
.lightbox-close:hover { border-color: var(--paper); }
.lightbox-hint { position: absolute; top: 2.5vh; left: var(--pad); opacity: .6; }

/* ---------- 读经引子 ---------- */
.reading-sec {
  min-height: 90vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--pad);
  padding: calc(var(--pad) * 3) var(--pad);
  background: var(--ink);
  color: var(--paper);
  position: relative; overflow: hidden;
}
.reading-left { display: flex; flex-direction: column; justify-content: space-between; gap: 3em; position: relative; z-index: 1; }
.reading-left .sec-title { color: var(--paper); }
.reading-desc { color: rgba(250, 249, 246, .75); max-width: 30em; }
.reading-cta {
  align-self: flex-start;
  font-family: var(--f-display); font-weight: 900;
  font-size: var(--t-med); letter-spacing: .4em;
  border: 1px solid var(--gold); color: var(--gold);
  padding: .55em 1.4em .55em 1.8em;
  transition: background .5s var(--ease-brush), color .5s var(--ease-brush);
}
.reading-cta:hover { background: var(--gold); color: var(--ink); }
.reading-right {
  writing-mode: vertical-rl;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--f-display);
  font-size: max(17px, calc(24 / var(--bsw) * 100vw));
  line-height: 2.6; letter-spacing: .35em;
  color: rgba(250, 249, 246, .92);
  position: relative; z-index: 1;
}
.reading-right small { font-size: .55em; color: var(--gold); margin-top: 3em; letter-spacing: .25em; }
.reading-bg {
  position: absolute; inset: -2%; z-index: 0;
  background-size: cover; background-position: center;
  opacity: .13; filter: saturate(.6);
}

/* ---------- 页脚 ---------- */
.footer {
  padding: calc(var(--pad) * 2) var(--pad);
  display: flex; justify-content: space-between; align-items: end; gap: 2em;
  border-top: 1px solid var(--hairline);
}
.footer-seal {
  width: 58px; height: 58px;
  border: 2px solid var(--cinnabar); color: var(--cinnabar);
  display: flex; align-items: center; justify-content: center;
  writing-mode: vertical-rl;
  font-family: var(--f-display); font-weight: 900;
  letter-spacing: .15em; font-size: 15px;
}
.footer .t-info { color: var(--ink-soft); }

/* ---------- 进场动画初始态（JS 会解除）---------- */
.js .rise { opacity: 0; transform: translateY(46px); }
.js .hero-title span { opacity: 0; transform: translateY(60%) rotate(4deg); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); row-gap: 70px; }
  .work:nth-child(n) { grid-column: auto / span 2; margin: 0; }
  .work:nth-child(2) { grid-column: auto / span 1; }
  .work:nth-child(4) { grid-column: auto / span 1; }
  .reading-sec { grid-template-columns: 1fr; }
  .reading-right { writing-mode: horizontal-tb; line-height: 2.2; letter-spacing: .2em; text-align: center; padding: 2em 0; }
  .hero-quote { display: none; }
  .scroll-head { grid-template-columns: 1fr; }
  .scroll-meta { text-align: left; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}