/* ==========================================================================
   作品集样式 —— 版式规格参考直向建筑 vectorarchitects.com
   内容宽 1180 / 四列网格 / 1.44:1 图块 / 极克制的字色分层
   ========================================================================== */
:root{
  --ink:#474342;          /* 主文字：暖深灰 */
  --ink-2:#3f3f3f;        /* 正文 */
  --meta:#aaa;            /* 辅助信息 */
  --line:#eee;
  --band:#f7f7f7;         /* 图集带底色 */
  --bg:#f1f1f1;           /* 图片占位底 */
  --maxw:1220px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:#fff;color:var(--ink);
  font:14px/1.75 "Helvetica Neue",Helvetica,Arial,"PingFang SC","Microsoft YaHei","微软雅黑",sans-serif;
  letter-spacing:normal;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;border:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.num{font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;letter-spacing:1px}

/* ---------- 顶栏 ---------- */
.hdr{
  position:fixed;left:0;top:0;width:100%;z-index:100;
  background:#fff;border-bottom:1px solid var(--line);
  padding:15px 0 14px;transition:transform .35s var(--ease),background .3s,border-color .3s,color .3s;
}
.hdr.hide{transform:translateY(-101%)}
.hdr .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:600;letter-spacing:.5px;line-height:1.2}
.logo-img{height:33px;width:auto;display:block}
.logo small{font-size:10.5px;font-weight:400;letter-spacing:1.4px;color:var(--meta);text-transform:uppercase}
.nav{display:flex;align-items:center;gap:30px;font-size:16px;letter-spacing:.4px}
.nav a{color:#9b9b9b;transition:color .25s}
.nav a:hover{color:var(--ink)}
.nav a.on{color:var(--ink)}
.nav a.ext{color:#9b9b9b}

/* 作品详情页：首屏透明顶栏 → 滚动后变实底 */
.hdr.over{background:transparent;border-bottom-color:transparent;color:#fff}
.hdr.over .logo small{color:rgba(255,255,255,.72)}
.hdr.over .nav a{color:rgba(255,255,255,.78)}
.hdr.over .nav a:hover,.hdr.over .nav a.on{color:#fff}

/* ---------- 项目列表 ---------- */
.secbar{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  padding:26px 0 20px;font-size:12px;letter-spacing:.5px;color:var(--meta);
}
.secbar b{font-weight:600;color:var(--ink);letter-spacing:.5px}
.main{padding-top:64px}          /* 给固定顶栏让位 */
.projects{list-style:none;margin:0 0 70px;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.card{position:relative;display:block;overflow:hidden;background:var(--bg);aspect-ratio:100/69.57}
.card img{width:100%;height:100%;object-fit:cover;transition:transform 1s var(--ease);will-change:transform}
.card:hover img{transform:scale(1.05)}
.card::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:42%;z-index:1;
  background:linear-gradient(to top,rgba(0,0,0,.34),rgba(0,0,0,0));
  opacity:0;transition:opacity .35s ease;pointer-events:none;
}
.card:hover::after{opacity:1}
.card .cap{
  position:absolute;left:18px;right:18px;bottom:10px;color:#fff;z-index:2;
  opacity:0;transition:opacity .35s ease;line-height:18px;font-size:12px;
  text-shadow:0 1px 14px rgba(0,0,0,.5),0 0 1px rgba(0,0,0,.3);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.card:hover .cap{opacity:1}
.card .cap b{display:block;font-weight:400;font-size:11px;margin-bottom:1px;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;letter-spacing:1px}
@media (hover:none){.card .cap{opacity:1}.card::after{opacity:1}}

/* ---------- 作品详情 ---------- */
.hero{position:relative;height:100vh;min-height:520px;overflow:hidden;background:var(--bg)}
/* 用 logo 图时顶栏保持白底实色，首屏需要让出顶栏高度 */
body.solid-hdr .hero{margin-top:63px;height:calc(100vh - 63px);min-height:460px}
.hero-track{position:absolute;left:0;top:0;width:100%;height:100%;will-change:transform}
.hero-slide{
  position:absolute;inset:0;background-size:cover;background-position:50% 50%;
  opacity:0;transition:opacity .9s var(--ease);
}
.hero-slide.on{opacity:1}
.hero-arrow{
  position:absolute;top:50%;margin-top:-49px;width:26px;height:98px;z-index:3;
  background:no-repeat 50%/contain;opacity:.9;transition:opacity .25s;
}
.hero-arrow:hover{opacity:1}
.hero-prev{left:16px;background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='26' height='98'%3E%3Cpath d='M22 8 L6 49 L22 90' fill='none' stroke='%23fff' stroke-width='1.4' opacity='.9'/%3E%3C/svg%3E")}
.hero-next{right:16px;background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='26' height='98'%3E%3Cpath d='M4 8 L20 49 L4 90' fill='none' stroke='%23fff' stroke-width='1.4' opacity='.9'/%3E%3C/svg%3E")}
.hero-down{
  position:absolute;left:50%;bottom:26px;width:1px;height:52px;margin-left:-.5px;z-index:3;
  background:rgba(255,255,255,.55);animation:drop 2.4s var(--ease) infinite;
}
@keyframes drop{0%{transform:scaleY(.25);transform-origin:top;opacity:.2}45%{transform:scaleY(1);opacity:1}100%{transform:scaleY(.25);transform-origin:bottom;opacity:.2}}
.hero-dots{position:absolute;right:24px;bottom:24px;display:flex;gap:7px;z-index:3}
.hero-dots i{width:5px;height:5px;border-radius:50%;background:rgba(255,255,255,.45);transition:background .3s}
.hero-dots i.on{background:#fff}

.detail{padding-bottom:0}
.detail-title{font-size:16px;font-weight:700;letter-spacing:1px;margin:80px 0 12px;line-height:1.5}
.detail-cols{display:flex;gap:7.5%;align-items:flex-start}
.dt{width:59.32%;min-width:0}
.dd{width:33.15%;color:var(--meta)}
.dt p{margin:0 0 0;line-height:1.75;color:var(--ink-2);text-align:justify}
.dt p+p{margin-top:1.4em}
.dt h3,.about-txt h3{font-size:14px;font-weight:400;color:var(--ink);letter-spacing:normal;margin:1.9em 0 .6em}
.dt h3::before,.about-txt h3::before{
  content:"l";font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;
  font-weight:400;margin-right:.5em;color:inherit;
}
.dt h3:first-child{margin-top:0}
.dd p{margin:0 0 15px;line-height:1.5;color:var(--meta)}
.dd p:last-child{margin-bottom:0}
.dd .k{white-space:nowrap}
.dd a{border-bottom:1px solid #ddd}

/* 图集带 */
.band{background:var(--band);margin:100px 0 0;padding:100px 0 70px}
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.gallery figure{margin:0;position:relative;overflow:hidden;background:#e9e9e9;aspect-ratio:100/69.57;cursor:zoom-in}
.gallery img{width:100%;height:100%;object-fit:cover}

/* ---------- 合集（参与过的项目：一个条目里多个项目） ---------- */
.collection{margin-top:64px;padding-bottom:10px}
.sub-item{padding:52px 0 58px;border-top:1px solid var(--line)}
.sub-head{display:flex;align-items:baseline;justify-content:space-between;gap:24px;margin-bottom:16px}
.sub-title{font-size:16px;font-weight:600;letter-spacing:.5px;color:var(--ink);margin:0;line-height:1.5}
.sub-idx{color:#c8c8c8;font-weight:400;font-size:13px;margin-right:12px;letter-spacing:1px}
.sub-meta{margin:0;color:var(--meta);font-size:12px;letter-spacing:.4px;text-align:right;white-space:nowrap}
.sub-body{width:59.32%;margin-bottom:24px}
.sub-body p{margin:0;line-height:1.75;color:var(--ink-2);text-align:justify}
.sub-body p+p{margin-top:1.4em}
.sub-body h3{font-size:14px;font-weight:400;color:var(--ink);letter-spacing:normal;margin:1.6em 0 .5em}
.sub-body h3::before{content:"l";font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;margin-right:.5em}

/* ---------- 上一个 / 下一个 ---------- */
.pager{display:flex;justify-content:space-between;gap:20px;padding:34px 0 0;font-size:12px;letter-spacing:.5px;color:var(--meta)}
.pager a{display:flex;flex-direction:column;gap:4px;max-width:46%;transition:color .25s}
.pager a:hover{color:var(--ink)}
.pager a.nx{text-align:right;margin-left:auto}
.pager span{font-size:14px;color:var(--ink);letter-spacing:normal}

/* 页脚 */
.ftr{margin:80px 0 0;padding:26px 0 34px;border-top:1px solid var(--line);font-size:11.5px;letter-spacing:.5px;color:#b3b3b3}
.ftr .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* ---------- 关于 ---------- */
.about{padding:0 0 40px}
.about h1{font-size:16px;font-weight:700;letter-spacing:1px;margin:80px 0 12px}
.about-cols{display:flex;gap:7.5%;align-items:flex-start}
.about-txt{width:59.32%}
.about-side{width:33.15%;color:var(--meta)}
.about-txt p{margin:0 0 0;line-height:1.75;color:var(--ink-2);text-align:justify}
.about-txt p+p{margin-top:1.75em}
.portrait{width:100%;background:var(--bg);margin-bottom:26px}
.about-side p{margin:0 0 12px;line-height:1.6}
.about-side .k{color:#c4c4c4;display:block;font-size:11px;letter-spacing:.8px;margin-bottom:2px}
.side-title{font-size:13px;font-weight:600;letter-spacing:.5px;color:var(--ink);margin:0 0 16px}
.side-note{color:#c0c0c0;font-size:12px;line-height:1.7;margin-top:18px!important}
.wxqr-wrap{margin:20px 0 0!important}
.wxqr{width:148px;border:1px solid var(--line);background:#fff}
.wxqr-wrap span{display:block;font-size:11px;letter-spacing:.8px;color:#bdbdbd;margin-top:8px}
.dl{display:inline-block;border-bottom:1px solid #ddd;padding-bottom:1px}

/* ---------- 灯箱 ---------- */
.lb{position:fixed;inset:0;z-index:300;background:rgba(255,255,255,.985);display:none;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.lb.on{display:flex;opacity:1}
.lb img{max-width:92vw;max-height:88vh;width:auto;height:auto;object-fit:contain}
.lb .cnt{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);font-size:11px;letter-spacing:2px;color:#b0b0b0}
.lb button{position:absolute;top:50%;width:44px;height:88px;margin-top:-44px;opacity:.55;transition:opacity .2s}
.lb button:hover{opacity:1}
.lb .p{left:10px}.lb .n{right:10px}
.lb .x{top:14px;right:16px;width:40px;height:40px;margin:0;font-size:26px;line-height:40px;color:#999;text-align:center}
.lb .p i,.lb .n i{position:absolute;inset:0;background:no-repeat 50%/contain}
.lb .p i{background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='48'%3E%3Cpath d='M20 4 L4 24 L20 44' fill='none' stroke='%23555' stroke-width='1.2'/%3E%3C/svg%3E")}
.lb .n i{background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='48'%3E%3Cpath d='M4 4 L20 24 L4 44' fill='none' stroke='%23555' stroke-width='1.2'/%3E%3C/svg%3E")}

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  .projects{grid-template-columns:repeat(3,1fr)}
  .gallery{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:899px){
  .hdr{padding:12px 0 11px}
  .logo{font-size:15px}
  .logo-img{height:26px}
  body.solid-hdr .hero{margin-top:52px;height:calc(100vh - 52px);min-height:380px}
  .logo small{display:none}
  .nav{gap:18px;font-size:13px}
  .secbar{padding:20px 0 14px}
  .projects{grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:40px}
  .card .cap{left:10px;right:10px;bottom:9px;opacity:1}
  .card .cap b{font-size:10px}
  .hero{height:70vh;min-height:400px}
  .hero-arrow{width:13px;height:49px;margin-top:-25px}
  .hero-down{height:34px;bottom:18px}
  .detail-title{margin:22px 0 14px}
  .detail-cols,.about-cols{display:block}
  .dt,.dd,.about-txt,.about-side{width:100%}
  .dt{margin-bottom:26px}
  .band{margin:26px 0 0;padding:22px 0 12px}
  .collection{margin-top:30px}
  .sub-item{padding:32px 0 36px}
  .sub-head{display:block;margin-bottom:12px}
  .sub-title{font-size:15px}
  .sub-meta{text-align:left;margin-top:6px;white-space:normal}
  .sub-body{width:100%;margin-bottom:18px}
  .gallery{grid-template-columns:repeat(2,1fr);gap:8px}
  .ftr{margin-top:44px}
  .about h1{margin:22px 0 14px}
}
@media (max-width:520px){
  .projects{grid-template-columns:1fr}
  .secbar{font-size:11px;letter-spacing:1px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}