/* ==========================================================
   超石力玉業 · 「玉冊」
   一部线装书式的官网：纸、墨、朱砂，与玉
   ========================================================== */

@font-face {
  font-family: "CeSong";               /* 思源宋体 · 子集 */
  src: url("../fonts/ceson.woff2") format("woff2");
  font-weight: 200 900;
  font-display: swap;
}
@font-face {
  font-family: "CeKai";                /* 霞鹜文楷 · 子集 */
  src: url("../fonts/cekai.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

:root {
  --paper:    #ebe4d3;    /* 旧纸 */
  --paper-hi: #f3eee0;
  --ink:      #2a2722;    /* 浓墨 */
  --ink-60:   rgba(42, 39, 34, 0.62);
  --ink-40:   rgba(42, 39, 34, 0.42);
  --ink-15:   rgba(42, 39, 34, 0.16);
  --zhu:      #ae3b26;    /* 朱砂 */
  --yu:       #64826f;    /* 玉色 */
  --song: "CeSong", "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --kai:  "CeKai", "Kaiti SC", "STKaiti", "KaiTi", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--song);
  font-weight: 400;
  background: var(--paper);
  /* 纸面肌理：细点 + 淡淡的年久色斑 */
  background-image:
    radial-gradient(rgba(42, 39, 34, 0.045) 1px, transparent 1px),
    radial-gradient(rgba(42, 39, 34, 0.03) 1px, transparent 1px),
    radial-gradient(ellipse 900px 600px at 12% 8%, rgba(174, 120, 60, 0.05), transparent 70%),
    radial-gradient(ellipse 800px 700px at 92% 88%, rgba(100, 130, 111, 0.05), transparent 70%);
  background-size: 4px 4px, 7px 7px, 100% 100%, 100% 100%;
  background-position: 0 0, 2px 3px, 0 0, 0 0;
  color: var(--ink);
  line-height: 2.1;
  letter-spacing: 0.06em;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
em { font-style: normal; color: var(--zhu); }

/* ---------- 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 1.1s cubic-bezier(0.22, 1, 0.36, 1),
              transform 1.1s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.on { opacity: 1; transform: none; }

.ink-reveal img {
  clip-path: inset(0 0 100% 0);
  transition: clip-path 1.4s cubic-bezier(0.65, 0, 0.2, 1);
}
.ink-reveal.on img { clip-path: inset(0 0 0% 0); }

.fade-a, .fade-b, .fade-c { opacity: 0; animation: rise 1.6s cubic-bezier(0.22,1,0.36,1) forwards; }
.fade-a { animation-delay: 0.3s; }
.fade-b { animation-delay: 0.7s; }
.fade-c { animation-delay: 1.3s; }
@keyframes rise { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  .reveal, .fade-a, .fade-b, .fade-c { opacity: 1 !important; transform: none !important; animation: none !important; transition: none !important; }
  .ink-reveal img { clip-path: none !important; transition: none !important; }
}

/* ==========================================================
   书眉（顶栏）
   ========================================================== */
.mast {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 20px clamp(20px, 5vw, 68px) 14px;
  transition: background 0.5s, box-shadow 0.5s;
}
.mast.solid {
  background: rgba(235, 228, 211, 0.96);
  box-shadow: 0 1px 0 var(--ink-15), 0 4px 0 -3px var(--ink-15);
}
.mast-brand {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.3em;
}
.mast-brand i {
  font-style: normal;
  font-size: 9px;
  letter-spacing: 0.52em;
  color: var(--ink-40);
  margin-left: 14px;
  font-weight: 400;
}
.mast-nav { display: flex; gap: clamp(14px, 2.6vw, 34px); }
.mast-nav a {
  font-family: var(--kai);
  font-size: 17px;
  position: relative;
  padding: 2px 2px 6px;
}
.mast-nav a::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 0;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--zhu);
  transform: translateX(-50%) scale(0);
  transition: transform 0.3s;
}
.mast-nav a:hover::after { transform: translateX(-50%) scale(1); }

/* ==========================================================
   右侧册页目录
   ========================================================== */
.spine {
  position: fixed;
  right: 26px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.spine a {
  font-family: var(--kai);
  font-size: 13px;
  width: 30px; height: 30px;
  display: grid;
  place-items: center;
  color: var(--ink-40);
  border: 1px solid transparent;
  border-radius: 50%;
  transition: 0.35s;
}
.spine a.now {
  color: var(--paper-hi);
  background: var(--zhu);
  box-shadow: 0 3px 9px rgba(174, 59, 38, 0.4);
}

/* ==========================================================
   扉页
   ========================================================== */
.cover {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 110px clamp(20px, 6vw, 80px) 40px;
  position: relative;
}
.cover-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(36px, 7vw, 110px);
  flex: 1;
}
.cover-title {
  display: flex;
  flex-direction: row-reverse;      /* 右起竖读 */
  gap: clamp(18px, 3vw, 44px);
  font-weight: 900;
  order: 2;
}
.ct-col {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: clamp(44px, 8.6vh, 92px);
  line-height: 1;
  letter-spacing: 0.16em;
}
.ct-col:last-child { margin-top: clamp(40px, 9vh, 110px); color: var(--ink); }
.ct-col:first-child { color: var(--zhu); }

.cover-img { order: 1; width: clamp(190px, 24vw, 320px); }
.cover-side {
  order: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
}
.cover-note {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--kai);
  font-size: 15px;
  letter-spacing: 0.5em;
  color: var(--ink-60);
}
.cover-foot {
  text-align: center;
  font-size: 13.5px;
  letter-spacing: 0.42em;
  color: var(--ink-60);
  padding-top: 26px;
  border-top: 1px solid var(--ink-15);
  width: min(560px, 86%);
  margin: 0 auto;
}
.cover-foot i { font-style: normal; color: var(--zhu); margin: 0 0.6em; }

/* 印章 */
.seal {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--kai);
  font-size: 14px;
  letter-spacing: 0.18em;
  line-height: 1.25;
  color: #f6efe0;
  background: var(--zhu);
  padding: 10px 6px;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1.5px rgba(246, 239, 224, 0.35), inset 0 0 0 3.5px var(--zhu), 0 2px 8px rgba(174, 59, 38, 0.3);
  user-select: none;
}

/* ==========================================================
   图版（博物馆展签式）
   ========================================================== */
.plate { position: relative; }
.plate img {
  width: 100%;
  filter: saturate(0.82) contrast(0.97) sepia(0.07);
  border: 1px solid var(--ink-15);
}
.plate-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 2px 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-60);
  line-height: 1.7;
}
.plate-label b {
  font-family: var(--kai);
  font-size: 16px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.3em;
}
.plate-label b::before {
  content: "◦ ";
  color: var(--zhu);
}

/* ==========================================================
   册页通用
   ========================================================== */
.folio {
  position: relative;
  padding: clamp(90px, 13vh, 150px) clamp(22px, 7vw, 90px);
}
.folio-head {
  font-size: 13px;
  letter-spacing: 0.5em;
  color: var(--zhu);
  margin-bottom: 30px;
}
.folio-head i {
  font-style: normal;
  color: var(--ink-40);
  letter-spacing: 0.34em;
  margin-left: 1em;
  font-size: 11px;
}
.folio-title {
  font-weight: 900;
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.5;
  letter-spacing: 0.14em;
  margin-bottom: 34px;
}
.folio-title.center { text-align: center; }
.prose {
  max-width: 33em;
  margin-bottom: 20px;
  color: var(--ink);
  font-size: 16px;
}
.prose.big {
  font-family: var(--kai);
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: 0.2em;
  color: var(--ink);
  margin-bottom: 36px;
}
.prose.center { margin-left: auto; margin-right: auto; text-align: center; }
.note {
  font-family: var(--kai);
  font-size: 14.5px;
  color: var(--ink-60);
  max-width: 30em;
  padding-left: 16px;
  border-left: 2px solid var(--zhu);
  line-height: 2;
}

/* ==========================================================
   序
   ========================================================== */
.xu {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  gap: clamp(40px, 6vw, 90px);
  border-top: 1px solid var(--ink-15);
}
.folio-mark {
  flex: none;
  writing-mode: vertical-rl;
  font-family: var(--kai);
  font-size: clamp(120px, 16vw, 210px);
  line-height: 1;
  color: rgba(42, 39, 34, 0.08);
  user-select: none;
  margin-top: 8px;
}
.folio-body { flex: 1; }
.end-seal { display: inline-block; margin-top: 10px; }
.folio-margin {
  flex: none;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--kai);
  font-size: 15px;
  letter-spacing: 0.62em;
  color: var(--ink-40);
  border-left: 1px solid var(--ink-15);
  padding-left: 22px;
  align-self: stretch;
}

/* ==========================================================
   卷一 · 源（整幅挂轴）
   ========================================================== */
.scroll-plate { position: relative; }
.scroll-img { margin: 0; }
.scroll-img img {
  width: 100%;
  height: clamp(480px, 92vh, 860px);
  object-fit: cover;
  filter: saturate(0.72) sepia(0.14) contrast(0.98);
}
.scroll-plate::after {          /* 底部纸色渐入 */
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 34%;
  background: linear-gradient(to top, var(--paper) 12%, transparent);
  pointer-events: none;
}
.chapter-mark {
  position: absolute;
  top: clamp(60px, 10vh, 120px);
  right: clamp(22px, 6vw, 84px);
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--kai);
  font-size: clamp(19px, 2.4vw, 27px);
  letter-spacing: 0.42em;
  color: #f2ead7;
  background: rgba(42, 39, 34, 0.6);
  padding: 22px 12px;
  border: 1px solid rgba(242, 234, 215, 0.3);
}
.scroll-caption {
  position: relative;
  z-index: 2;
  margin: -190px auto 0 clamp(22px, 8vw, 110px);
  max-width: 560px;
  background: var(--paper-hi);
  border: 1px solid var(--ink-15);
  padding: clamp(30px, 4vw, 52px);
  box-shadow: 0 30px 60px rgba(42, 39, 34, 0.18);
}
.scroll-caption .folio-title { font-size: clamp(26px, 3.4vw, 40px); margin-bottom: 22px; }

/* ==========================================================
   卷二 · 器（错落图录）
   ========================================================== */
.qi { max-width: 1240px; margin: 0 auto; }
.folio-watermark {
  position: absolute;
  top: 90px;
  right: clamp(10px, 4vw, 60px);
  font-family: var(--kai);
  font-size: clamp(200px, 30vw, 420px);
  line-height: 1;
  color: rgba(42, 39, 34, 0.05);
  pointer-events: none;
  user-select: none;
}
.qi-head { max-width: 560px; margin-bottom: clamp(60px, 8vh, 100px); position: relative; z-index: 1; }
.plates {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(28px, 4vw, 56px) clamp(20px, 3vw, 44px);
  align-items: start;
}
.plates .plate img { aspect-ratio: 4 / 5; object-fit: cover; }
.p1 { grid-column: 1 / span 5; }
.p2 { grid-column: 7 / span 4; margin-top: clamp(70px, 10vw, 150px); }
.p3 { grid-column: 3 / span 4; margin-top: clamp(-40px, -2vw, -20px); }
.p4 { grid-column: 8 / span 5; margin-top: clamp(30px, 5vw, 90px); }
.p4 img { aspect-ratio: 5 / 4; }
.p5 { grid-column: 1 / span 6; margin-top: clamp(40px, 6vw, 100px); }
.p5 img { aspect-ratio: 5 / 4; }
.p6 { grid-column: 8 / span 4; margin-top: clamp(80px, 11vw, 170px); }

/* ==========================================================
   卷三 · 工（朱丝栏 · 竖排）
   ========================================================== */
.gong { max-width: 1240px; margin: 0 auto; }
.gong-head { max-width: 560px; margin-bottom: clamp(50px, 7vh, 90px); }
.gong-cols {
  display: flex;
  flex-direction: row-reverse;         /* 右起 */
  justify-content: center;
  gap: 0;
  background: var(--paper-hi);
  border: 1px solid rgba(174, 59, 38, 0.5);
  padding: clamp(34px, 5vw, 60px) clamp(20px, 3vw, 46px);
  box-shadow: 0 1px 0 3px var(--paper-hi), 0 0 0 4px rgba(174, 59, 38, 0.35);
}
.gcol {
  writing-mode: vertical-rl;
  text-orientation: upright;
  height: clamp(330px, 44vh, 430px);
  padding: 0 clamp(16px, 2.6vw, 34px);
  border-left: 1px solid rgba(174, 59, 38, 0.4);
  display: flex;
  align-items: flex-start;
}
.gcol:first-child { border-right: 1px solid rgba(174, 59, 38, 0.4); }
.gcol-no {
  font-family: var(--kai);
  font-size: 13px;
  color: var(--paper-hi);
  background: var(--zhu);
  border-radius: 50%;
  width: 24px; height: 24px;
  display: inline-grid;
  place-items: center;
  writing-mode: horizontal-tb;
  margin-bottom: 18px;
  flex: none;
  align-self: center;
}
.gcol h3 {
  flex: none;
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 900;
  letter-spacing: 0.34em;
  margin-bottom: 22px;
}
.gcol p {
  flex: 1;
  min-height: 0;
  font-family: var(--kai);
  font-size: 15px;
  letter-spacing: 0.2em;
  color: var(--ink-60);
  line-height: 2.4;
}
.gong-hint {
  text-align: center;
  margin-top: 26px;
  font-family: var(--kai);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ink-40);
}

/* ==========================================================
   卷四 · 養
   ========================================================== */
.yang { max-width: 1240px; margin: 0 auto; }
.yang-grid {
  display: grid;
  grid-template-columns: minmax(280px, 460px) 1fr auto;
  gap: clamp(40px, 6vw, 90px);
  align-items: center;
}
.plate.tall img { aspect-ratio: 3 / 4; object-fit: cover; }
.yang-quote {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--kai);
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: 0.4em;
  color: var(--ink);
  border-right: 1px solid var(--ink-15);
  padding-right: 26px;
  height: fit-content;
}
.yang-quote cite {
  display: block;
  font-style: normal;
  font-size: 13px;
  color: var(--ink-40);
  margin-top: 26px;
  letter-spacing: 0.28em;
}

/* ==========================================================
   跋（版权页式）
   ========================================================== */
.colophon {
  text-align: center;
  padding: clamp(90px, 13vh, 150px) 24px clamp(70px, 9vh, 110px);
  max-width: 760px;
  margin: 0 auto;
}
.colophon .folio-head { text-align: center; }
.colophon-rule {
  display: block;
  width: 1px;
  height: 74px;
  background: var(--ink-40);
  margin: 0 auto 40px;
}
.colophon-list {
  list-style: none;
  margin: 46px auto 50px;
  text-align: left;
  max-width: 520px;
}
.colophon-list li {
  display: flex;
  align-items: baseline;
  gap: 22px;
  padding: 15px 4px;
  border-bottom: 1px dashed var(--ink-15);
  font-size: 15.5px;
}
.colophon-list li:first-child { border-top: 1px dashed var(--ink-15); }
.colophon-list b {
  font-family: var(--kai);
  font-weight: 400;
  color: var(--zhu);
  letter-spacing: 0.24em;
  flex: none;
}
.colophon-list i {
  font-style: normal;
  margin-left: auto;
  font-size: 12.5px;
  color: var(--ink-40);
  letter-spacing: 0.2em;
}
.big-seal {
  font-size: 16px;
  padding: 14px 8px;
}

/* ==========================================================
   页尾
   ========================================================== */
.tail {
  text-align: center;
  padding: 30px 20px 36px;
  border-top: 1px solid var(--ink-15);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--ink-40);
  line-height: 2.2;
}
.tail a { text-decoration: underline; text-underline-offset: 4px; }
.tail a:hover { color: var(--ink); }

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1080px) {
  .spine { display: none; }
  .yang-grid { grid-template-columns: 1fr; }
  .yang-quote { writing-mode: horizontal-tb; border-right: 0; border-left: 1px solid var(--ink-15); padding: 4px 0 4px 22px; }
  .yang-quote cite { margin-top: 8px; }
}

@media (max-width: 820px) {
  .mast { padding: 14px 18px 10px; }
  .mast-brand { font-size: 16px; letter-spacing: 0.2em; }
  .mast-brand i { display: none; }
  .mast-nav a { font-size: 15px; }

  .cover { padding: 90px 20px 30px; }
  .cover-inner { flex-direction: column; gap: 34px; }
  .cover-title { order: 1; }
  .ct-col { font-size: clamp(38px, 10vw, 54px); }
  .ct-col:last-child { margin-top: 48px; }
  .cover-img { order: 2; width: min(72vw, 300px); }
  .cover-side { order: 3; flex-direction: row; }
  .cover-note { writing-mode: horizontal-tb; }

  .xu { flex-direction: column; gap: 26px; }
  .folio-mark { writing-mode: horizontal-tb; font-size: 96px; }
  .folio-margin { display: none; }

  .scroll-caption { margin: -120px 18px 0; }
  .chapter-mark { top: 40px; right: 18px; padding: 16px 9px; }

  .plates { grid-template-columns: 1fr 1fr; gap: 34px 18px; }
  .p1, .p3, .p5 { grid-column: 1; }
  .p2, .p4, .p6 { grid-column: 2; }
  .p1, .p2, .p3, .p4, .p5, .p6 { margin-top: 0; }
  .p2, .p4 { margin-top: 44px; }
  .plate-label span { display: none; }        /* 小屏只留品名 */

  .gong-cols { flex-wrap: wrap; flex-direction: row-reverse; }
  .gcol { height: 300px; flex: 1 1 40%; padding: 14px; }
  .gcol:nth-child(-n+2) { border-bottom: 1px solid rgba(174, 59, 38, 0.3); }

  .colophon-list li { flex-wrap: wrap; gap: 8px 16px; }
  .colophon-list i { margin-left: 0; width: 100%; }
}