/* ==========================================================================
   两册专页 · 方案设计 / 动画设计
   与首页共用一套夜色调：夜底、一束白蓝光、只留发丝级的线。
   编号、英文小标与分隔线复用档案页的排版语言，保证三个页面是同一份东西。
   ========================================================================== */

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

:root{
  --night:#040A1C;
  --night-deep:#02060F;
  --night-1:#071229;
  --beam:#EAF2FF;
  --beam-mid:#8FB6FF;
  --beam-dim:#5B87D8;
  --muted:#8595B5;
  --muted-d:#A6B5D0;
  --line-d:rgba(170,200,255,.13);
  --line-s:rgba(170,200,255,.08);
  --ease:cubic-bezier(.22,.61,.36,1);
  --wrap:1240px;
  --font:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --mono:"SF Mono","JetBrains Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:
    radial-gradient(64% 44% at 86% -6%, rgba(91,135,216,.16) 0%, rgba(91,135,216,0) 72%),
    radial-gradient(50% 40% at 8% 8%, rgba(64,110,190,.10) 0%, rgba(64,110,190,0) 70%),
    var(--night-deep);
  color:var(--beam);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
::selection{background:rgba(143,182,255,.28)}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 6vw}

/* ── 顶部：品牌 + 返回 ── */
.vol-bar{
  display:flex;justify-content:space-between;align-items:center;
  padding-block:26px 0;
}
.vol-bar .brand{font-size:15px;font-weight:600;letter-spacing:.02em}
.vol-bar .brand em{
  font:400 10px/1 var(--mono);letter-spacing:.2em;font-style:normal;
  color:rgba(234,242,255,.42);margin-left:9px;
}
.vol-bar .back{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12.5px;color:rgba(234,242,255,.6);
  transition:color .35s var(--ease);
}
.vol-bar .back svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.6}
.vol-bar .back:hover{color:var(--beam)}

/* ── 册头 ── */
.vol-head{padding-block:clamp(52px,7vw,92px) clamp(38px,5vw,60px)}
.vol-eyebrow{
  display:flex;align-items:center;gap:12px;
  font:400 10.5px/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;
  color:rgba(143,182,255,.72);
}
.vol-eyebrow::before{content:"";width:26px;height:1px;background:rgba(143,182,255,.5)}

.vol-head h1{
  margin:22px 0 0;
  font-size:clamp(38px,5.6vw,72px);
  font-weight:600;line-height:1.1;letter-spacing:-.03em;
}
.vol-head h1 em{
  display:block;margin-top:14px;
  font:400 11px/1 var(--mono);font-style:normal;
  letter-spacing:.24em;text-transform:uppercase;
  color:rgba(234,242,255,.34);
}
.vol-lead{
  margin-top:26px;max-width:36em;
  font-size:15.5px;line-height:2;
  color:rgba(234,242,255,.72);
}
.vol-lead b{font-weight:500;color:var(--beam)}

/* 册头下方的数据条：只用发丝线和大写字，不加框 */
.vol-meta{
  display:flex;flex-wrap:wrap;gap:0;
  margin-top:clamp(30px,4vw,46px);
  border-top:1px solid var(--line-s);
}
.vol-meta div{
  flex:1 1 0;min-width:150px;
  padding:16px 22px 0 0;
}
.vol-meta dt{
  font:400 10px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;
  color:rgba(234,242,255,.32);
}
.vol-meta dd{margin-top:9px;font-size:14px;color:rgba(234,242,255,.82)}

/* ── 内容形态：三栏，靠编号与留白分栏，不做卡片框 ── */
.vol-forms{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:clamp(26px,3.4vw,56px);
  padding:clamp(34px,4vw,48px) 0 clamp(46px,6vw,76px);
  border-top:1px solid var(--line-s);
}
.form-no{
  font:400 10px/1 var(--mono);letter-spacing:.16em;
  color:rgba(143,182,255,.66);
}
.form-t{
  margin:14px 0 0;font-size:clamp(17px,1.5vw,20px);font-weight:600;letter-spacing:-.01em;
}
.form-d{margin-top:12px;font-size:13.5px;line-height:1.95;color:rgba(166,181,208,.8)}

/* ── 条目区 ── */
.vol-ledger{border-top:1px solid var(--line-s);padding-top:clamp(34px,4vw,48px)}
.ledger-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:26px}
.ledger-head h2{font-size:clamp(20px,2vw,26px);font-weight:600;letter-spacing:-.02em}
.ledger-head p{font-size:12.5px;color:rgba(166,181,208,.66);padding-bottom:3px;text-align:right}

/* 空册状态：一块安静的面板，用一根灯管作为唯一图形。
   面板刻意不撑满整栏 —— 让留白落在页边，而不是落在框里。 */
.await{
  display:flex;align-items:center;gap:clamp(22px,3vw,38px);
  max-width:840px;
  padding:clamp(28px,3.4vw,40px) clamp(24px,3vw,38px);
  border-radius:18px;
  background:linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.02));
  box-shadow:inset 0 1px 0 rgba(190,215,255,.16), 0 0 0 1px rgba(170,200,255,.07);
}
.await-tube{
  flex:0 0 auto;width:4px;height:clamp(56px,7vw,74px);border-radius:2px;
  background:linear-gradient(180deg,#FFFFFF,#F6FAFF 55%,#CBDDFF);
  box-shadow:0 0 8px rgba(198,224,255,.6),0 0 26px rgba(120,170,255,.4);
}
.await-t{font-size:16px;font-weight:600;letter-spacing:-.01em}
.await-d{margin-top:10px;max-width:30em;font-size:13.5px;line-height:1.95;color:rgba(166,181,208,.8)}
.await-d a{
  color:var(--beam-mid);
  text-decoration:underline;text-decoration-thickness:1px;
  text-underline-offset:4px;text-decoration-color:rgba(143,182,255,.4);
  transition:text-decoration-color .35s var(--ease);
}
.await-d a:hover{text-decoration-color:rgba(143,182,255,.95)}

/* ── 册尾：上一册 / 下一册，做成目录条而不是两个空盒子 ── */
.vol-nav{
  margin:clamp(44px,5.5vw,76px) 0 0;
  border-top:1px solid var(--line-s);
}
.vn{
  display:grid;grid-template-columns:150px 1fr auto;
  align-items:baseline;gap:clamp(14px,2vw,28px);
  padding:19px 2px;
  border-bottom:1px solid var(--line-s);
  transition:padding-left .45s var(--ease),background .45s var(--ease);
}
.vn:hover{padding-left:12px;background:rgba(255,255,255,.022)}
.vn span{
  font:400 10px/1.4 var(--mono);letter-spacing:.16em;text-transform:uppercase;
  color:rgba(234,242,255,.34);
}
.vn b{font-size:16px;font-weight:600;letter-spacing:-.01em;color:rgba(234,242,255,.9)}
.vn small{font-size:12.5px;color:rgba(166,181,208,.62);text-align:right}
.vn:hover b{color:#fff}

/* ── 页脚 ── */
.vol-foot{
  display:flex;justify-content:space-between;align-items:baseline;gap:20px;flex-wrap:wrap;
  margin-top:clamp(52px,7vw,90px);padding-block:26px 40px;
  border-top:1px solid var(--line-s);
  font-size:11.5px;color:rgba(166,181,208,.5);
}
.vol-foot a{color:rgba(234,242,255,.66)}
.vol-foot a:hover{color:var(--beam)}

@media(max-width:900px){
  .vol-forms{grid-template-columns:1fr;gap:0}
  .vol-forms > div + div{margin-top:28px;padding-top:28px;border-top:1px solid var(--line-s)}
  .vol-meta div{flex:1 1 45%}
  .vn{grid-template-columns:1fr;row-gap:7px}
  .vn span{order:1}
  .vn b{order:2}
  .vn small{order:3;text-align:left}
  .vn:hover{padding-left:2px}
  .ledger-head{display:block}
  .ledger-head p{text-align:left;margin-top:10px}
  .await{flex-direction:column;align-items:flex-start;gap:22px}
  .await-tube{height:44px}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
}

/* ==========================================================================
   首页 · 精选项目下方的两册入口（与 grid 同一视觉体系，只是一行两条）
   ========================================================================== */
.books{margin-top:clamp(26px,3.2vw,40px)}
.books-head{
  display:flex;justify-content:space-between;align-items:baseline;gap:32px;
  padding-bottom:16px;border-bottom:1px solid var(--line-s,rgba(170,200,255,.08));
}
.books-head .eyebrow{color:var(--muted)}
.books-head p{font-size:12.5px;color:rgba(166,181,208,.62);max-width:36em;text-align:right}
.books-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(12px,1.4vw,18px);margin-top:clamp(16px,2vw,22px)}
.book{
  position:relative;display:block;
  padding:clamp(24px,2.6vw,34px);
  border-radius:22px;
  background:rgba(255,255,255,.05);
  box-shadow:inset 0 1px 0 rgba(190,215,255,.15),0 0 0 1px rgba(170,200,255,.06);
  transition:transform .6s var(--ease),background .6s var(--ease),box-shadow .6s var(--ease);
  overflow:hidden;
}
.book:hover{
  transform:translateY(-5px);background:rgba(255,255,255,.085);
  box-shadow:inset 0 1px 0 rgba(190,215,255,.28),0 0 0 1px rgba(170,200,255,.14),0 24px 60px -30px rgba(0,0,0,.9);
}
.book-no{font:400 10px/1 var(--mono);letter-spacing:.18em;color:rgba(143,182,255,.7)}
.book h3{margin-top:16px;font-size:clamp(21px,2.1vw,27px);font-weight:600;letter-spacing:-.02em}
.book em{
  display:block;margin-top:10px;
  font:400 10px/1 var(--mono);font-style:normal;letter-spacing:.22em;text-transform:uppercase;
  color:rgba(234,242,255,.32);
}
.book p{margin-top:18px;max-width:30em;font-size:13px;line-height:1.9;color:rgba(166,181,208,.8)}
.book-go{
  display:inline-flex;align-items:center;gap:8px;margin-top:22px;
  font-size:12.5px;color:rgba(234,242,255,.74);
}
.book-go svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2;transition:transform .45s var(--ease)}
.book:hover .book-go svg{transform:translate(3px,-3px)}
/* 一条极淡的光带，hover 才亮 —— 呼应首屏灯管 */
.book::after{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,rgba(143,182,255,0),rgba(143,182,255,.75),rgba(143,182,255,0));
  opacity:0;transition:opacity .6s var(--ease);
}
.book:hover::after{opacity:1}

@media(max-width:820px){
  .books-head{display:block}
  .books-head p{text-align:left;margin-top:10px}
  .books-row{grid-template-columns:1fr}
}

/* ==========================================================================
   作品条目 · 一图一条
   ========================================================================== */
.works{list-style:none;margin:0;padding:0}
.work{
  display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);
  gap:clamp(22px,3.4vw,56px);
  align-items:start;
  padding-block:clamp(30px,4.2vw,54px);
  border-top:1px solid var(--line-s);
}
.work:first-child{border-top:0;padding-top:clamp(10px,1.4vw,18px)}

.work-fig{
  position:relative;display:block;overflow:hidden;
  border-radius:14px;background:#060B16;
  box-shadow:0 0 0 1px rgba(170,200,255,.09),0 46px 90px -56px rgba(0,0,0,.95);
  cursor:zoom-in;
}
.work-fig img{
  width:100%;height:auto;display:block;
  transition:transform 1.2s var(--ease),filter .9s var(--ease);
  filter:saturate(.95) brightness(.97);
}
.work-fig:hover img{transform:scale(1.018);filter:saturate(1.05) brightness(1.02)}
.work-fig::after{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(198,224,255,.62),transparent);
  opacity:0;transition:opacity .65s var(--ease);
}
.work-fig:hover::after{opacity:1}

.work-info{align-self:center;padding-block:clamp(2px,1.2vw,12px)}
.work-no{
  display:block;
  font:400 10.5px/1 var(--mono);letter-spacing:.2em;
  color:rgba(143,182,255,.72);
}
.work-info h3{
  margin-top:14px;
  font-size:clamp(20px,2.15vw,28px);font-weight:600;
  letter-spacing:-.022em;line-height:1.35;
}
.work-sub{
  margin-top:8px;
  font:400 10px/1.7 var(--mono);letter-spacing:.15em;text-transform:uppercase;
  color:rgba(166,181,208,.5);
}
.work-info > p:last-of-type{
  margin-top:18px;font-size:13.5px;line-height:2.05;
  color:rgba(200,214,235,.82);max-width:31em;
}
.work-tags{display:flex;flex-wrap:wrap;gap:7px;margin:20px 0 0;padding:0;list-style:none}
.work-tags li{
  font-size:11px;line-height:1.7;padding:2px 10px 3px;border-radius:20px;
  color:rgba(214,226,247,.74);
  background:rgba(143,182,255,.055);
  box-shadow:inset 0 0 0 1px rgba(143,182,255,.14);
}

.works-note{
  margin-top:clamp(26px,3vw,38px);padding-top:18px;
  border-top:1px solid var(--line-s);
  font-size:12px;color:rgba(166,181,208,.48);
}

@media(max-width:880px){
  .work{grid-template-columns:1fr;gap:20px}
  .work-info{padding-top:0}
  .work-info > p:last-of-type{max-width:100%}
}

/* ==========================================================================
   动画条目 · 可播放的分镜卡
   ========================================================================== */
.films{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(22px,2.8vw,36px) clamp(18px,2.4vw,30px);
}
.film-lead{grid-column:1 / -1}
.film-lead .film-info h3{font-size:clamp(19px,1.9vw,24px)}

.film-stage{
  position:relative;display:block;width:100%;padding:0;border:0;
  aspect-ratio:16/9;overflow:hidden;border-radius:13px;
  background:#060B16;cursor:pointer;
  box-shadow:0 0 0 1px rgba(170,200,255,.09),0 44px 84px -58px rgba(0,0,0,.95);
  transition:box-shadow .6s var(--ease);
}
.film-stage:hover{box-shadow:0 0 0 1px rgba(170,200,255,.2),0 50px 96px -58px rgba(0,0,0,1)}
.film-stage img{
  width:100%;height:100%;object-fit:cover;display:block;
  transition:transform 1.2s var(--ease),filter .7s var(--ease);
  filter:saturate(.96) brightness(.98);
}
.film-stage:hover img{transform:scale(1.028);filter:saturate(1.05)}
.film-stage::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(to top,rgba(3,7,16,.42),rgba(3,7,16,0) 46%);
  transition:opacity .5s var(--ease);
}
.film-stage.playing::after{opacity:0}

.film-play{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:56px;height:56px;border-radius:50%;display:grid;place-items:center;
  background:rgba(6,13,28,.4);
  box-shadow:inset 0 0 0 1px rgba(206,226,255,.38),0 14px 40px -14px rgba(0,0,0,.9);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  transition:background .45s var(--ease),transform .45s var(--ease),box-shadow .45s var(--ease),opacity .3s;
}
.film-play svg{width:21px;height:21px;fill:#EAF2FF;margin-left:3px}
.film-stage:hover .film-play{
  background:rgba(143,182,255,.26);
  transform:translate(-50%,-50%) scale(1.07);
  box-shadow:inset 0 0 0 1px rgba(210,230,255,.72),0 0 34px rgba(143,182,255,.4);
}
.film-len{
  position:absolute;right:12px;bottom:11px;
  font:400 10px/1 var(--mono);letter-spacing:.1em;
  padding:5px 8px 6px;border-radius:5px;
  color:rgba(226,238,255,.82);background:rgba(4,10,24,.62);
  transition:opacity .3s;
}
.film-stage.playing .film-play,
.film-stage.playing .film-len{opacity:0;pointer-events:none}

.film-video{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;background:#000;z-index:4;
}

.film-info{margin-top:17px}
.film-no{
  display:block;
  font:400 10px/1 var(--mono);letter-spacing:.2em;
  color:rgba(143,182,255,.7);
}
.film-info h3{
  margin-top:11px;font-size:16.5px;font-weight:600;
  letter-spacing:-.016em;line-height:1.45;
}
.film-info p{
  margin-top:9px;font-size:13px;line-height:1.95;
  color:rgba(178,194,219,.78);max-width:38em;
}

@media(max-width:820px){
  .films{grid-template-columns:1fr}
  .film-play{width:48px;height:48px}
  .film-play svg{width:18px;height:18px}
}

/* ==========================================================================
   卷 03 · 施工图：图号带 + 项目清单 + 现场对照
   ========================================================================== */
.vol-docs{margin-top:clamp(52px,7vw,90px)}
.vol-docs-2{margin-top:clamp(48px,6.4vw,84px)}

.docs-rail{
  list-style:none;margin:clamp(22px,2.8vw,32px) 0 0;padding:0;
  display:grid;grid-template-columns:repeat(5,minmax(0,1fr));
  border-top:1px solid var(--line-d);
}
.docs-rail li{
  padding:18px 14px 6px 0;
  border-right:1px solid var(--line-s);
}
.docs-rail li + li{padding-left:16px}
.docs-rail li:last-child{border-right:0}
.docs-rail span{
  font:400 10px/1 var(--mono);letter-spacing:.15em;
  color:rgba(143,182,255,.74);
}
.docs-rail b{display:block;margin-top:13px;font-size:13.5px;font-weight:600;letter-spacing:-.01em}
.docs-rail em{
  display:block;margin-top:8px;font-style:normal;
  font-size:11.5px;line-height:1.8;color:rgba(166,181,208,.6);
}

.doc-list{list-style:none;margin:0;padding:0}
.doc{
  display:grid;grid-template-columns:42px minmax(0,1fr) auto;
  gap:clamp(14px,2.4vw,30px);align-items:start;
  padding-block:clamp(24px,3vw,36px);
  border-top:1px solid var(--line-s);
}
.doc:first-child{border-top:0;padding-top:clamp(8px,1.2vw,16px)}
.doc-no{
  font:400 10.5px/1.6 var(--mono);letter-spacing:.16em;
  color:rgba(143,182,255,.6);padding-top:5px;
}
.doc-main h3{font-size:clamp(17px,1.6vw,21px);font-weight:600;letter-spacing:-.016em;line-height:1.5}
.doc-sub{
  margin-top:7px;
  font:400 9.5px/1.7 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:rgba(166,181,208,.45);
}
.doc-main > p:last-of-type{
  margin-top:13px;font-size:13px;line-height:1.98;
  color:rgba(186,200,222,.78);max-width:47em;
}
.doc-n{
  font:300 27px/1 var(--mono);letter-spacing:-.02em;
  color:rgba(234,242,255,.92);text-align:right;white-space:nowrap;padding-top:1px;
}
.doc-n em{
  font-style:normal;font-size:10px;letter-spacing:.1em;
  color:rgba(166,181,208,.5);margin-left:5px;
}

.docs-photos{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(16px,2.2vw,26px);margin-top:clamp(22px,2.6vw,32px);
}
.docs-photos figure{margin:0}
.docs-photos img{
  width:100%;aspect-ratio:3/2;object-fit:cover;display:block;border-radius:10px;
  box-shadow:0 0 0 1px rgba(170,200,255,.1),0 30px 60px -46px rgba(0,0,0,.9);
}
.docs-photos figcaption{
  margin-top:11px;font-size:11.5px;line-height:1.8;
  color:rgba(166,181,208,.6);
}
.docs-note{
  margin-top:clamp(18px,2.2vw,26px);
  font-size:12.5px;line-height:1.95;
  color:rgba(166,181,208,.55);max-width:54em;
}

@media(max-width:900px){
  .docs-rail{grid-template-columns:1fr}
  .docs-rail li{border-right:0;border-bottom:1px solid var(--line-s);padding:15px 0}
  .docs-rail li + li{padding-left:0}
  .doc{grid-template-columns:1fr auto;row-gap:10px}
  .doc-no{grid-column:1 / -1;padding-top:0}
  .doc-n{grid-row:2;grid-column:2}
  .docs-photos{grid-template-columns:1fr}
}

/* ---- 卷 03 · 图纸截图（整幅铺开，黑底与图纸黑底同色，不额外加框） ---- */
.vol-plates{margin-top:clamp(50px,6.4vw,84px)}
.vol-plates figure{margin:0}
.vol-plates img{
  width:100%;display:block;border-radius:9px;background:#000;
  box-shadow:0 0 0 1px rgba(160,195,255,.14),0 46px 90px -66px rgba(0,0,0,.95);
}
.plate-lead img{aspect-ratio:auto;object-fit:contain}
.plate-grid{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(20px,2.6vw,30px) clamp(16px,2.2vw,26px);
  margin-top:clamp(18px,2.4vw,28px);
}
.plate-grid img{aspect-ratio:4/3;object-fit:contain}
.vol-plates figcaption{
  margin-top:11px;font-size:11.5px;line-height:1.8;
  color:rgba(166,181,208,.6);
}
@media(max-width:900px){
  .plate-grid{grid-template-columns:1fr}
}