:root { --ink:#201b17; --paper:#f5f3ef; --warm:#b78a68; --wood:#53382b; --line:rgba(32,27,23,.16); }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; color:var(--ink); background:var(--paper); font-family:Inter,"Microsoft YaHei",sans-serif; letter-spacing:0; }
button,a { color:inherit; font:inherit; }
button { cursor:pointer; }
.topbar { position:fixed; inset:0 0 auto; height:72px; padding:0 clamp(20px,4vw,64px); display:flex; align-items:center; justify-content:space-between; z-index:30; color:white; border-bottom:1px solid rgba(255,255,255,.22); transition:.35s; }
.topbar.scrolled { color:var(--ink); background:rgba(245,243,239,.92); backdrop-filter:blur(16px); border-color:var(--line); }
.brand { display:flex; align-items:center; gap:11px; text-decoration:none; }
.brand-logo { width:142px; height:38px; display:block; object-fit:cover; object-position:center; border-radius:2px; }
.brand b { display:block; font-family:"Noto Serif SC",serif; font-weight:600; }
.brand small { display:block; margin-top:2px; font-size:8px; letter-spacing:2px; opacity:.7; }
nav { display:flex; gap:32px; }
nav a { text-decoration:none; font-size:13px; }
.icon-button { width:38px; height:38px; border:0; background:transparent; color:inherit; font-size:23px; }
.hero { min-height:100svh; position:relative; display:flex; align-items:flex-end; overflow:hidden; color:white; }
.hero-image { position:absolute; inset:0; background:center/cover; transform:scale(1.02); transition:background-image .7s ease, transform 6s ease; }
.hero.playing .hero-image { transform:scale(1.08); }
.hero-shade { position:absolute; inset:0; background:linear-gradient(90deg,rgba(17,12,9,.68),rgba(17,12,9,.08) 62%),linear-gradient(0deg,rgba(17,12,9,.65),transparent 45%); }
.hero-content { position:relative; z-index:2; width:min(780px,80%); padding:0 0 clamp(70px,10vh,110px) clamp(24px,7vw,110px); }
.eyebrow { margin:0 0 18px; font-size:11px; letter-spacing:3px; text-transform:uppercase; opacity:.78; }
.eyebrow.dark { color:#745c4c; }
h1,h2,h3,h4 { font-family:"Noto Serif SC",serif; font-weight:600; letter-spacing:0; }
h1 { margin:0 0 20px; font-size:clamp(56px,9vw,116px); line-height:1; }
.hero-copy { max-width:580px; margin:0; font-size:clamp(15px,1.6vw,19px); line-height:1.9; opacity:.9; }
.hero-actions { display:flex; align-items:center; gap:28px; margin-top:32px; }
.primary-button { padding:14px 19px; background:white; color:var(--ink); text-decoration:none; font-size:13px; }
.primary-button span { margin-left:28px; }
.text-button { border:0; background:transparent; color:white; padding:12px 0; }
.text-button span { margin-left:10px; }
.hero-meta { position:absolute; left:clamp(24px,7vw,110px); bottom:25px; display:flex; gap:18px; z-index:2; font-size:11px; opacity:.7; }
.slide-count { position:absolute; right:clamp(24px,5vw,70px); bottom:28px; z-index:2; display:flex; align-items:baseline; gap:6px; }
.slide-count b { font-family:"Noto Serif SC",serif; font-size:30px; }.slide-count span{font-size:11px;opacity:.65}
.section { padding:clamp(80px,11vw,150px) clamp(24px,7vw,110px); }
.concept { display:grid; grid-template-columns:1.05fr .95fr; gap:10vw; align-items:end; }
.section h2 { margin:0; font-size:clamp(36px,5vw,66px); line-height:1.28; }
.concept-copy>p { margin:0 0 46px; font-size:16px; line-height:2; color:#655d57; }
.metrics { display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid var(--line); padding-top:24px; }
.metrics div { display:flex; flex-direction:column; gap:7px; }.metrics strong{font:600 30px "Noto Serif SC",serif}.metrics span{font-size:11px;color:#80766e}
.gallery-section { background:#ebe7e1; }
.section-heading { display:flex; align-items:end; justify-content:space-between; gap:30px; margin-bottom:55px; }
.section-heading>p { color:#746b64; font-size:13px; }
.gallery { min-height:620px; display:grid; grid-template-columns:minmax(0,1.5fr) minmax(280px,.5fr); background:#ddd6ce; }
.gallery-main { position:relative; padding:0; border:0; overflow:hidden; background:#cfc7be; min-height:500px; }
.gallery-main img { width:100%; height:100%; display:block; object-fit:cover; transition:transform .55s ease, opacity .3s; }
.gallery-main:hover img { transform:scale(1.015); }
.zoom-label { position:absolute; left:22px; bottom:22px; padding:10px 13px; background:rgba(245,243,239,.88); font-size:11px; backdrop-filter:blur(8px); }
.gallery-info { padding:clamp(32px,5vw,70px); background:var(--wood); color:white; display:flex; flex-direction:column; justify-content:center; }
.gallery-index { font-size:11px; letter-spacing:2px; opacity:.5; }
.gallery-info h4 { font-size:clamp(20px,2.6vw,32px); margin:14px 0 18px; }
.gallery-info>p:not(.gallery-index){font-size:14px;line-height:1.9;opacity:.72}
.gallery-controls { display:flex; gap:10px; margin-top:auto; }.round-button{width:46px;height:46px;border:1px solid rgba(255,255,255,.3);border-radius:50%;background:transparent;color:white;font-size:18px}.round-button:hover{background:white;color:var(--wood)}
.details { color:white; background:#211b17; }
.detail-grid { display:grid; grid-template-columns:repeat(4,1fr); border-top:1px solid rgba(255,255,255,.17); }
.detail-item { min-height:310px; padding:35px 28px; border-right:1px solid rgba(255,255,255,.17); }.detail-item:last-child{border:0}.detail-item>span{font-size:10px;opacity:.45}.detail-item h3{margin:75px 0 20px;font-size:25px}.detail-item p{font-size:13px;line-height:1.9;opacity:.62}
footer { padding:30px clamp(24px,7vw,110px); display:flex; justify-content:space-between; border-top:1px solid var(--line); font-size:11px; }footer a{text-decoration:none}
.reveal { opacity:0; transform:translateY(22px); transition:.75s ease; }.reveal.visible{opacity:1;transform:none}
.page-progress { position:fixed; inset:0 0 auto; height:3px; z-index:60; background:#c6a184; transform:scaleX(0); transform-origin:left; }
.chapter-rail { position:fixed; right:22px; top:50%; transform:translateY(-50%); z-index:25; display:flex; flex-direction:column; gap:13px; }
.chapter-rail a { display:flex; align-items:center; justify-content:flex-end; gap:10px; color:white; text-decoration:none; filter:drop-shadow(0 1px 4px rgba(0,0,0,.5)); }
.chapter-rail span { font-size:9px; opacity:.55; }.chapter-rail b{width:0;overflow:hidden;white-space:nowrap;font-size:10px;font-weight:500;transition:.25s}.chapter-rail a:after{content:"";width:5px;height:5px;border:1px solid currentColor;border-radius:50%;transition:.25s}.chapter-rail a:hover b,.chapter-rail a.active b{width:32px}.chapter-rail a.active:after{background:currentColor;transform:scale(1.5)}
.topbar.scrolled~.chapter-rail a { color:var(--ink); }
.hero-image.changing { opacity:.35; transform:scale(1.1); }
.overview { display:grid; grid-template-columns:.85fr 1.15fr; gap:9vw; background:#f0ede8; }
.overview-grid { display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid var(--line); }
.overview-stat { min-height:190px; padding:28px 18px 20px 0; border-right:1px solid var(--line); display:flex; flex-direction:column; }
.overview-stat:nth-child(3){border-right:0;padding-left:18px}.overview-stat:nth-child(2){padding-left:18px}.overview-stat>span{font-size:9px;letter-spacing:2px;color:#8a7e74}.overview-stat strong{margin:auto 0 10px;font:600 20px "Noto Serif SC",serif}.overview-stat small{font-size:8px;color:#9b9189}
.palette { grid-column:1/-1; display:grid; grid-template-columns:repeat(4,1fr); border-top:1px solid var(--line); padding-top:22px; }
.palette button { display:flex;align-items:center;gap:10px;border:0;background:transparent;padding:0;text-align:left;font-size:10px;color:#6e655e}.palette i{display:block;width:100%;max-width:72px;height:22px;background:var(--swatch)}
.thumbnail-strip { display:flex; gap:12px; margin-top:18px; overflow-x:auto; padding-bottom:8px; }
.thumbnail { position:relative; flex:0 0 150px; aspect-ratio:4/3; padding:0; border:2px solid transparent; background:#ccc; overflow:hidden; opacity:.55; transition:.25s; cursor:pointer; }.thumbnail.active,.thumbnail:hover{opacity:1;border-color:var(--wood)}.thumbnail img{width:100%;height:100%;object-fit:cover}.thumbnail span{position:absolute;right:6px;bottom:5px;color:white;font-size:9px;text-shadow:0 1px 4px #000}
.presentation-hud { position:fixed; left:30px; right:30px; bottom:20px; z-index:70; display:none; justify-content:space-between; align-items:center; color:white; font-size:10px; text-shadow:0 1px 5px #000; pointer-events:none; }.presentation-hud.visible{display:flex}.presentation-hud kbd{padding:3px 6px;border:1px solid rgba(255,255,255,.55);border-radius:3px;background:rgba(0,0,0,.25)}
.presenting .topbar { opacity:0; pointer-events:none; }.presenting .chapter-rail{right:30px}.presenting section{scroll-margin-top:0}

/* ---- 分楼层画廊 ---- */
.floor-gallery { margin-top:72px; }
.floor-gallery:first-of-type { margin-top:0; }
.floor-head { display:flex; align-items:flex-end; justify-content:space-between; gap:24px; margin-bottom:28px; }
.floor-head h3 { margin:8px 0 0; font-size:clamp(24px,3vw,40px); }
.floor-sub { margin:8px 0 0; color:#7a6f67; font-size:13px; }
.floor-count { font-size:12px; letter-spacing:1px; color:#8a7e74; white-space:nowrap; }

/* ---- 暗箱 Lightbox ---- */
dialog { width:min(94vw,1400px); max-width:none; padding:0; border:0; background:#171310; color:white; box-shadow:0 30px 80px rgba(0,0,0,.45); }
dialog::backdrop { background:rgba(10,8,7,.9); backdrop-filter:blur(7px); }
.lightbox-stage { position:relative; display:flex; align-items:center; justify-content:center; }
#lightbox img { display:block; max-width:100%; max-height:78vh; width:auto; height:auto; object-fit:contain; transition:opacity .18s; }
.lb-caption { position:absolute; left:0; right:0; bottom:0; margin:0; padding:14px 20px; font-size:12px; background:linear-gradient(0deg,rgba(0,0,0,.6),transparent); }
.lb-close { position:absolute; right:14px; top:12px; width:42px; height:42px; border:0; border-radius:50%; background:rgba(0,0,0,.5); color:white; font-size:26px; z-index:3; }
.lb-nav { position:absolute; top:50%; transform:translateY(-50%); width:48px; height:48px; border:1px solid rgba(255,255,255,.4); border-radius:50%; background:rgba(0,0,0,.4); color:white; font-size:22px; z-index:3; }
.lb-nav.prev { left:14px; } .lb-nav.next { right:14px; }
.lb-landscape { position:absolute; left:14px; bottom:14px; padding:9px 14px; border:1px solid rgba(255,255,255,.4); border-radius:22px; background:rgba(0,0,0,.4); color:white; font-size:12px; z-index:3; }
#lightbox.landscape { width:100vw; height:100vh; max-width:none; }
#lightbox.landscape .lightbox-stage { position:absolute; inset:0; width:100vh; height:100vw; margin:auto; transform:rotate(90deg); }
#lightbox.landscape img { max-height:100%; max-width:100%; }

@media (max-width:800px){
  .topbar{height:62px}.topbar nav{display:none}.hero{min-height:92svh}.hero-content{width:100%;padding-left:24px;padding-right:24px}.hero-meta{display:none}
  .concept{grid-template-columns:1fr;gap:50px}.section-heading{align-items:start;flex-direction:column}
  .gallery{grid-template-columns:1fr;min-height:0}.gallery-main{aspect-ratio:4/3;min-height:0}.gallery-info{min-height:360px}
  .detail-grid{grid-template-columns:1fr 1fr}.detail-item{min-height:250px}.detail-item h3{margin-top:45px}
  .chapter-rail{display:none}
  .floor-head{align-items:flex-start;flex-direction:column;gap:8px}
}
@media (max-width:480px){
  .brand-logo{width:118px;height:32px}.brand b,.brand small{display:none}
  .hero-actions{align-items:flex-start;flex-direction:column;gap:10px}.metrics{gap:10px}.metrics strong{font-size:24px}
  .detail-grid{grid-template-columns:1fr 1fr}.detail-item{border-right:1px solid rgba(255,255,255,.17)}.detail-item:last-child{border-right:0}
  footer{gap:20px;flex-direction:column}
}