/* 澄庐 CHENGLU RESIDENCE —— 配色与排版沿用「上海云境私宅」设计体系 */
:root{
  --ink:#f2efe7;
  --paper:#12120f;
  --paper-2:#181713;
  --line:#ffffff29;
  --muted:#ffffff8f;
  --accent:#a58a60;
  --accent-bright:#d5ba87;
  --dark:#141411;
  --radius-sm:10px;--radius-md:18px;--radius-lg:28px;
  --serif:"Songti SC","STSong","Noto Serif CJK SC","Times New Roman",serif;
  --sans:"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.7;-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
::selection{background:var(--accent);color:#12120f}

/* 阅读进度条 */
.reading-progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--accent-bright));z-index:120}

/* 顶栏 */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;gap:32px;padding:14px 32px;background:rgba(18,18,15,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-family:var(--serif);font-size:17px;letter-spacing:.06em}
.brand small{display:block;font-family:var(--sans);font-size:9px;letter-spacing:.28em;color:var(--muted)}
.brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--accent);border-radius:50%;color:var(--accent-bright);font-size:18px}
.primary-nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.primary-nav a{color:var(--muted);text-decoration:none;font-size:13px;letter-spacing:.14em;padding:8px 12px;border-radius:999px;transition:color .25s,background .25s}
.primary-nav a:hover,.primary-nav a.active{color:var(--ink);background:#ffffff14}
.fullscreen-button{border:1px solid var(--line);border-radius:999px;padding:9px 18px;font-size:13px;letter-spacing:.1em;color:var(--ink);transition:border-color .25s,background .25s;white-space:nowrap}
.fullscreen-button:hover{border-color:var(--accent);background:#a58a6022}

/* 首屏 */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;padding:120px 6vw 9vh;overflow:hidden}
.hero-media,.hero-media video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-shade{position:absolute;inset:0;background:linear-gradient(180deg,rgba(18,18,15,.45) 0%,rgba(18,18,15,.15) 40%,rgba(18,18,15,.88) 100%)}
.hero-kicker{position:absolute;top:110px;left:6vw;font-size:12px;letter-spacing:.4em;color:var(--accent-bright);text-transform:uppercase}
.hero-copy{position:relative;max-width:820px}
.hero-copy>p{font-size:13px;letter-spacing:.42em;color:var(--muted);margin-bottom:18px}
.hero-copy h1{font-family:var(--serif);font-size:clamp(40px,6.4vw,86px);line-height:1.15;font-weight:600;letter-spacing:.04em}
.hero-copy h1 span{display:block;font-family:Georgia,var(--serif);font-size:clamp(14px,1.4vw,20px);letter-spacing:.5em;color:var(--accent-bright);margin-top:14px;font-weight:400}
.hero-summary{margin-top:34px;display:flex;align-items:center;gap:36px;flex-wrap:wrap}
.hero-summary p{font-size:16px;color:#ffffffc9}
.hero-summary a{display:inline-flex;align-items:center;gap:10px;border:1px solid var(--accent);color:var(--accent-bright);border-radius:999px;padding:13px 26px;text-decoration:none;font-size:14px;letter-spacing:.14em;transition:background .3s,color .3s}
.hero-summary a:hover{background:var(--accent);color:#12120f}
.hero-index{position:absolute;right:6vw;bottom:9vh;display:flex;flex-direction:column;align-items:flex-end;font-family:Georgia,serif;color:var(--muted)}
.hero-index span:first-child{font-size:44px;color:var(--accent-bright)}
.hero-index span:last-child{font-size:14px;letter-spacing:.3em}
.hero-index::before{content:"";width:1px;height:64px;background:var(--line);margin-bottom:14px}

/* 通用章节 */
.section{padding:14vh 6vw;max-width:1560px;margin:0 auto}
.section-label{display:flex;align-items:center;gap:18px;margin-bottom:52px}
.section-label span{font-family:Georgia,serif;font-size:15px;color:var(--accent-bright);border:1px solid var(--accent);border-radius:50%;width:46px;height:46px;display:grid;place-items:center}
.section-label p{font-size:12px;letter-spacing:.4em;color:var(--muted)}
.display-title{font-family:var(--serif);font-size:clamp(30px,3.6vw,54px);line-height:1.35;font-weight:600;letter-spacing:.03em}
.display-title em{font-style:normal;color:var(--accent-bright)}

/* 进场动效 */
.reveal{opacity:0;transform:translateY(36px);transition:opacity .9s cubic-bezier(.22,.61,.36,1),transform .9s cubic-bezier(.22,.61,.36,1)}
.reveal.visible{opacity:1;transform:none}

/* 01 概念 */
.narrative-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:6vw;align-items:start}
.narrative-copy .lead{font-size:19px;color:var(--ink);margin-bottom:22px}
.narrative-copy p:not(.lead){color:var(--muted);font-size:15.5px}
.strategy-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:9vh}
.strategy-cards article{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius-md);padding:34px 30px;transition:transform .35s,border-color .35s}
.strategy-cards article:hover{transform:translateY(-6px);border-color:var(--accent)}
.strategy-cards span{font-size:11px;letter-spacing:.3em;color:var(--accent-bright)}
.strategy-cards h3{font-family:var(--serif);font-size:23px;margin:14px 0 12px}
.strategy-cards p{font-size:14.5px;color:var(--muted)}

/* 02 平面 */
.plan-section{background:var(--paper-2);border-block:1px solid var(--line);max-width:none}
.plan-grid{max-width:1440px;margin:0 auto;display:grid;grid-template-columns:1fr 1.4fr;gap:5vw;align-items:center}
.plan-copy p{color:var(--muted);margin-top:26px;font-size:15.5px}
.plan-facts{list-style:none;display:flex;gap:36px;margin-top:38px;flex-wrap:wrap}
.plan-facts strong{display:block;font-family:Georgia,serif;font-size:30px;color:var(--accent-bright)}
.plan-facts span{font-size:12.5px;letter-spacing:.16em;color:var(--muted)}
.plan-media{position:relative;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--line);background:#0f0f0d;width:100%}
.plan-media img{width:100%;height:auto;transition:transform .6s}
.plan-media:hover img{transform:scale(1.025)}
.zoom-hint{position:absolute;right:16px;bottom:16px;background:rgba(18,18,15,.78);border:1px solid var(--line);border-radius:999px;padding:7px 16px;font-size:12.5px;letter-spacing:.12em;color:var(--accent-bright)}

/* 03 空间 · 探索器 */
.space-explorer{display:grid;grid-template-columns:190px minmax(0,1.5fr) minmax(300px,.9fr);gap:26px;margin-top:7vh;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;align-items:stretch}
.space-nav{display:flex;flex-direction:column;gap:10px}
.space-nav button{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:13px 18px;border:1px solid var(--line);border-radius:999px;font-size:14.5px;letter-spacing:.08em;color:var(--ink);text-align:left;transition:background .3s,border-color .3s,color .3s}
.space-nav button small{font-size:10px;letter-spacing:.22em;color:var(--muted);text-transform:uppercase}
.space-nav button:hover{border-color:var(--accent)}
.space-nav button.active{background:#f2efe7;color:#181713;border-color:#f2efe7}
.space-nav button.active small{color:#18171399}
.space-stage{position:relative;display:flex;flex-direction:column;gap:14px;min-width:0}
.space-media{position:relative;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--line);background:#0f0f0d;flex:1;min-height:320px}
.space-media img,.space-media video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.space-view-pills{display:flex;gap:10px;flex-wrap:wrap}
.space-view-pills button{border:1px solid var(--line);border-radius:999px;padding:9px 18px;font-size:12.5px;letter-spacing:.1em;color:var(--muted);transition:all .3s}
.space-view-pills button:hover{border-color:var(--accent);color:var(--ink)}
.space-view-pills button.active{background:var(--accent);border-color:var(--accent);color:#12120f}
.space-view-pills .pill-kind{margin-left:auto;align-self:center;font-size:11px;letter-spacing:.24em;color:var(--accent-bright)}
.space-detail{display:flex;flex-direction:column;gap:18px;padding:8px 6px}
.space-en{font-size:11px;letter-spacing:.34em;color:var(--accent-bright);text-transform:uppercase}
.space-detail h3{font-family:var(--serif);font-size:clamp(22px,1.9vw,30px);line-height:1.4;font-weight:600}
.space-desc{font-size:14.5px;color:var(--muted)}
.space-tags{display:flex;gap:8px;flex-wrap:wrap}
.space-tags span{border:1px solid var(--line);border-radius:999px;padding:5px 13px;font-size:12px;color:var(--muted)}
.space-hint{margin-top:auto;border-top:1px solid var(--line);padding-top:16px}
.space-hint span{font-size:11px;letter-spacing:.28em;color:var(--muted)}
.space-hint p{font-size:13px;color:#ffffffb8;margin-top:8px}

/* 空间图集横向条 */
.space-strip-head{display:flex;align-items:center;justify-content:space-between;margin-top:6vh}
.space-strip-head p{font-size:13px;letter-spacing:.22em;color:var(--muted)}
.strip-arrows{display:flex;gap:10px}
.strip-arrows button{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);font-size:16px;color:var(--ink);transition:border-color .3s,background .3s}
.strip-arrows button:hover{border-color:var(--accent);background:#a58a6022}
.space-strip{display:flex;gap:18px;overflow-x:auto;scroll-snap-type:x mandatory;padding:18px 2px 26px;scrollbar-width:thin;scrollbar-color:var(--accent) transparent}
.space-strip::-webkit-scrollbar{height:6px}
.space-strip::-webkit-scrollbar-thumb{background:#a58a6066;border-radius:3px}
.space-strip figure{position:relative;flex:0 0 300px;scroll-snap-align:start;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--line)}
.space-strip button{display:block;width:100%;aspect-ratio:4/3;padding:0;background:#191916}
.space-strip img{width:100%;height:100%;object-fit:cover;transition:transform .6s,filter .6s}
.space-strip button:hover img{transform:scale(1.06);filter:brightness(1.06)}
.space-strip figcaption{position:absolute;left:0;right:0;bottom:0;padding:34px 16px 12px;background:linear-gradient(180deg,transparent,rgba(15,15,13,.88));font-family:var(--serif);font-size:14.5px;pointer-events:none}

/* 05/06 板材 */
.board-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:7vh}
.board{display:flex;flex-direction:column;gap:16px}
.board button{border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--line);aspect-ratio:1/1;background:#0f0f0d;padding:0}
.board img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.board button:hover img{transform:scale(1.04)}
.board h3{font-family:Georgia,var(--serif);font-size:19px;letter-spacing:.12em}
.board p{font-size:13.5px;color:var(--muted)}

/* 07 信息 */
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden}
.info-grid>div{background:var(--paper-2);padding:30px 28px}
.info-grid span{display:block;font-size:12px;letter-spacing:.26em;color:var(--muted);margin-bottom:10px}
.info-grid strong{font-family:var(--serif);font-size:20px;font-weight:600}
.info-note{margin-top:30px;font-size:14px;color:var(--muted);letter-spacing:.04em}

/* 页脚 */
.site-footer{border-top:1px solid var(--line);padding:44px 6vw;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12.5px;letter-spacing:.18em;color:var(--muted)}

/* 灯箱 */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(15,15,13,.94);backdrop-filter:blur(10px);display:none;align-items:center;justify-content:center;padding:5vh 8vw}
.lightbox.open{display:flex}
.lightbox figure{max-width:100%;max-height:100%;display:flex;flex-direction:column;gap:16px;align-items:center}
.lightbox img{max-width:100%;max-height:80vh;object-fit:contain;border-radius:var(--radius-sm)}
.lightbox figcaption{font-family:var(--serif);font-size:16px;color:var(--accent-bright);letter-spacing:.1em}
.lightbox button{position:absolute;color:var(--ink);font-size:34px;line-height:1;width:52px;height:52px;border-radius:50%;border:1px solid var(--line);background:rgba(24,23,19,.7);transition:border-color .25s,background .25s}
.lightbox button:hover{border-color:var(--accent);background:#a58a6033}
.lightbox-close{top:26px;right:26px}
.lightbox-prev{left:2.5vw;top:50%;transform:translateY(-50%)}
.lightbox-next{right:2.5vw;top:50%;transform:translateY(-50%)}

/* 响应式 */
@media(max-width:1080px){
  .narrative-grid,.plan-grid{grid-template-columns:1fr}
  .board-grid,.strategy-cards,.info-grid{grid-template-columns:repeat(2,1fr)}
  .space-explorer{grid-template-columns:1fr}
  .space-nav{flex-direction:row;overflow-x:auto;padding-bottom:6px}
  .space-nav button{flex:0 0 auto}
  .space-media{min-height:0;aspect-ratio:16/10}
}
@media(max-width:680px){
  .site-header{padding:10px 16px;gap:14px}
  .brand small{display:none}
  .primary-nav{display:none}
  .hero{padding:100px 6vw 10vh}
  .board-grid,.strategy-cards,.info-grid{grid-template-columns:1fr}
  .space-strip figure{flex-basis:78vw}
  .hero-index{display:none}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{transition:none;opacity:1;transform:none}
  *{transition-duration:.01ms!important}
}