/* =========================================================
   徐文兵 · 汽车数字设计作品集
   mobile-first / 单文件样式表
   ========================================================= */

:root{
  --ink:#0b0b0c;
  --ink-2:#141416;
  --paper:#f4f2ee;
  --paper-2:#eae6de;
  --accent:#ffc300;
  --muted:#6f6f73;
  --muted-d:#9a9a9f;
  --line:rgba(11,11,12,.14);
  --line-d:rgba(255,255,255,.16);
  --gutter:clamp(18px,5vw,64px);
  --head-h:64px;
  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Cascadia Mono",Consolas,monospace;
  --sans:"Helvetica Neue",Inter,system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --ease:cubic-bezier(.22,.68,.16,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,figure,dl,dd,ol,ul{margin:0}
ul,ol{padding:0;list-style:none}
::selection{background:var(--accent);color:var(--ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--accent);color:var(--ink);padding:10px 18px;font:600 14px/1 var(--sans);
}
.skip:focus{left:12px;top:12px}

.wrap{width:min(1240px,100% - var(--gutter)*2);margin-inline:auto}

/* ---------- header ---------- */
.site-head{
  position:fixed;inset:0 0 auto 0;z-index:80;
  background:rgba(11,11,12,.78);
  -webkit-backdrop-filter:saturate(140%) blur(14px);
  backdrop-filter:saturate(140%) blur(14px);
  border-bottom:1px solid rgba(255,255,255,.1);
  color:#fff;
}
.head-in{
  width:min(1240px,100% - var(--gutter)*2);margin-inline:auto;
  height:var(--head-h);display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{display:flex;align-items:baseline;gap:10px;letter-spacing:.02em}
.brand-mark{font:800 17px/1 var(--sans);letter-spacing:.06em}
.brand-sub{
  font:500 10px/1 var(--mono);letter-spacing:.22em;text-transform:uppercase;
  color:var(--muted-d);
}
.nav{display:none;gap:clamp(16px,2.4vw,34px)}
.nav a{
  position:relative;font-size:14px;letter-spacing:.02em;color:rgba(255,255,255,.72);
  padding:6px 0;transition:color .25s var(--ease);
}
.nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--accent);
  transition:right .35s var(--ease);
}
.nav a:hover,.nav a.is-active{color:#fff}
.nav a.is-active::after,.nav a:hover::after{right:0}

.menu-btn{
  display:inline-flex;align-items:center;gap:10px;
  background:none;border:1px solid rgba(255,255,255,.24);color:#fff;
  padding:8px 12px;border-radius:2px;cursor:pointer;
  font:500 12px/1 var(--mono);letter-spacing:.14em;
}
.menu-bars{display:grid;gap:4px;width:16px}
.menu-bars i{display:block;height:1px;background:#fff;transition:transform .3s var(--ease)}
body.menu-open .menu-bars i:first-child{transform:translateY(2.5px) rotate(45deg)}
body.menu-open .menu-bars i:last-child{transform:translateY(-2.5px) rotate(-45deg)}

@media (max-width:899px){
  .nav{
    position:fixed;inset:var(--head-h) 0 0 0;z-index:79;
    display:flex;flex-direction:column;justify-content:center;gap:0;
    background:rgba(11,11,12,.97);
    padding:0 var(--gutter) 12vh;
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:opacity .28s var(--ease),transform .28s var(--ease);
  }
  body.menu-open .nav{opacity:1;transform:none;pointer-events:auto}
  .nav a{
    font-size:clamp(26px,7vw,38px);font-weight:700;letter-spacing:-.01em;
    padding:14px 0;border-bottom:1px solid rgba(255,255,255,.1);color:#fff;
  }
  .nav a::after{display:none}
}
@media (min-width:900px){
  .nav{display:flex}
  .menu-btn{display:none}
}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;background:var(--ink);color:#fff;
  min-height:100svh;display:flex;align-items:center;
  padding-top:calc(var(--head-h) + clamp(26px,5vw,60px));
  padding-bottom:clamp(40px,6vw,76px);
}
.hero-inner{
  width:min(1240px,100% - var(--gutter)*2);margin-inline:auto;
  display:grid;gap:clamp(30px,5vw,52px);align-items:center;
}
@media (min-width:900px){
  .hero-inner{grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);gap:clamp(36px,5vw,76px)}
}
.kicker{
  display:flex;align-items:center;gap:10px;
  font:500 11px/1 var(--mono);letter-spacing:.26em;color:var(--accent);
  text-transform:uppercase;
}
.dot{width:6px;height:6px;background:var(--accent);border-radius:50%;flex:none}
.hero-name{
  font-size:clamp(56px,9.4vw,122px);line-height:.95;font-weight:800;
  letter-spacing:-.035em;margin-top:clamp(10px,1.6vw,18px);
}
.hero-role{
  margin-top:clamp(8px,1.2vw,14px);
  font-size:clamp(16px,1.6vw,21px);font-weight:600;letter-spacing:.01em;
  color:rgba(255,255,255,.94);
}
.hero-role span{color:var(--muted-d);margin:0 .35em;font-weight:400}
.hero-desc{
  margin-top:8px;font-size:clamp(13px,1.2vw,15px);color:rgba(255,255,255,.56);
  letter-spacing:.01em;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:clamp(24px,3.2vw,36px)}
.btn{
  display:inline-flex;align-items:center;gap:9px;min-height:46px;padding:0 20px;
  border:1px solid rgba(255,255,255,.26);border-radius:2px;
  font:600 13px/1 var(--sans);letter-spacing:.05em;color:#fff;
  transition:background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.btn:hover{border-color:rgba(255,255,255,.8);background:rgba(255,255,255,.08)}
.btn--solid{background:var(--accent);border-color:var(--accent);color:var(--ink)}
.btn--solid:hover{background:#ffd23f;border-color:#ffd23f;color:var(--ink)}

.hero-meta{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(12px,2vw,24px);
  margin-top:clamp(30px,4.2vw,50px);padding-top:clamp(18px,2.4vw,26px);
  border-top:1px solid rgba(255,255,255,.14);
}
.hero-meta li{display:flex;flex-direction:column;gap:7px;min-width:0}
.hm-k{
  font:500 9.5px/1 var(--mono);letter-spacing:.2em;color:var(--accent);text-transform:uppercase;
}
.hm-v{
  font-size:13px;color:rgba(255,255,255,.8);letter-spacing:.01em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

.hero-poster{margin:0;background:#111113;border:1px solid rgba(255,255,255,.16)}
.hero-poster img{width:100%;height:auto;aspect-ratio:2200/979;object-fit:cover}
.hero-poster figcaption{
  display:flex;justify-content:space-between;gap:10px;
  padding:10px 12px;border-top:1px solid rgba(255,255,255,.12);
  font:500 9px/1 var(--mono);letter-spacing:.18em;
  color:rgba(255,255,255,.46);text-transform:uppercase;
}

/* ---------- section shell ---------- */
.sec{padding-block:clamp(64px,9vw,132px);position:relative}
.sec--paper{background:var(--paper-2)}
.sec--dark{background:var(--ink);color:var(--paper)}
.sec[id]{scroll-margin-top:var(--head-h)}

.sec-head{
  display:grid;grid-template-columns:auto 1fr;align-items:end;gap:8px 18px;
  padding-bottom:clamp(22px,3vw,34px);border-bottom:1px solid var(--line);
  margin-bottom:clamp(28px,4vw,54px);
}
.sec--dark .sec-head{border-color:var(--line-d)}
.sec-head .num{
  grid-row:1;font:500 12px/1 var(--mono);letter-spacing:.2em;color:var(--muted);
}
.sec--dark .sec-head .num{color:var(--accent)}
.sec-head h2{
  grid-column:1/-1;grid-row:2;
  font-size:clamp(30px,4.6vw,58px);line-height:1.05;font-weight:800;letter-spacing:-.02em;
}
.sec-en{
  grid-column:2;grid-row:1;justify-self:end;
  font:500 10px/1 var(--mono);letter-spacing:.26em;color:var(--muted);text-transform:uppercase;
}
.sec--dark .sec-en{color:var(--muted-d)}
@media (min-width:760px){
  .sec-head{grid-template-columns:auto 1fr auto;align-items:center}
  .sec-head h2{grid-column:2;grid-row:1}
  .sec-en{grid-column:3;grid-row:1;align-self:center}
}

.sec-intro{
  max-width:62ch;margin-top:-16px;margin-bottom:clamp(28px,4vw,48px);
  font-size:clamp(15px,1.5vw,18px);color:#3f3f42;
}

/* ---------- about ---------- */
.about-grid{display:grid;gap:clamp(28px,4vw,64px)}
@media (min-width:880px){.about-grid{grid-template-columns:minmax(0,360px) minmax(0,1fr);align-items:start}}

.portrait{background:var(--ink);border:1px solid var(--line)}
.portrait img{width:100%;height:auto;aspect-ratio:445/600;object-fit:cover;object-position:50% 22%}
.portrait figcaption{
  display:flex;flex-direction:column;gap:2px;padding:14px 16px 16px;background:var(--ink);color:#fff;
}
.portrait strong{font-size:16px;letter-spacing:.02em}
.portrait span{font:500 10px/1.6 var(--mono);letter-spacing:.14em;color:var(--muted-d);text-transform:uppercase}

.lead{
  font-size:clamp(24px,3.4vw,40px);line-height:1.25;font-weight:800;letter-spacing:-.02em;
  margin-bottom:clamp(14px,2vw,22px);
}
.body-txt{max-width:60ch;color:#3c3c40;font-size:clamp(15px,1.5vw,17px);line-height:1.85}

.facts{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;
  margin:clamp(26px,3.4vw,40px) 0 0;border-top:1px solid var(--line);
}
@media (min-width:620px){.facts{grid-template-columns:repeat(3,minmax(0,1fr))}}
.facts>div{padding:14px 4px 14px 0;border-bottom:1px solid var(--line)}
.facts dt{font:500 10px/1 var(--mono);letter-spacing:.16em;color:var(--muted);text-transform:uppercase}
.facts dd{margin:6px 0 0;font-size:15px;font-weight:600;letter-spacing:.01em}

.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:clamp(22px,3vw,32px)}
.tags li{
  font:500 12px/1 var(--mono);letter-spacing:.08em;
  padding:8px 12px;border:1px solid rgba(11,11,12,.22);border-radius:999px;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s;
}
.tags li:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}

/* ---------- projects ---------- */
.projects{display:grid;gap:clamp(26px,3.4vw,44px) clamp(20px,2.6vw,36px)}
@media (min-width:720px){.projects{grid-template-columns:repeat(2,minmax(0,1fr))}}

.card{border-top:1px solid var(--line);padding-top:16px}
.card-media{overflow:hidden;background:#ded9d0;aspect-ratio:2.05/1}
.card-media img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .9s var(--ease);
}
.card:hover .card-media img{transform:scale(1.035)}
.card-body{display:grid;grid-template-columns:auto 1fr;gap:2px 12px;margin-top:14px;align-items:baseline}
.card-idx{font:500 11px/1 var(--mono);letter-spacing:.14em;color:var(--muted)}
.card-body h3{font-size:clamp(17px,2vw,22px);font-weight:700;letter-spacing:-.01em;line-height:1.3}
.card-body h3 em{font-style:italic;font-weight:600;color:var(--muted);font-family:Georgia,"Times New Roman",serif}
.card-meta{
  grid-column:2;display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;
  margin-top:4px;font-size:12.5px;color:var(--muted);letter-spacing:.01em;
}
.chip{
  display:inline-block;padding:3px 7px;border-radius:2px;
  background:rgba(11,11,12,.07);color:#26262a;
  font:500 10px/1.4 var(--mono);letter-spacing:.1em;
}
.chip--im{background:rgba(11,11,12,.9);color:var(--paper)}

/* ---------- capability ---------- */
.cap + .cap{margin-top:clamp(56px,7vw,104px)}
.cap-head{max-width:760px;margin-bottom:clamp(20px,2.6vw,32px)}
.cap-head h3{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;
  font-size:clamp(22px,2.8vw,32px);font-weight:700;letter-spacing:-.015em;
}
.cap-en{
  font:500 10px/1 var(--mono);letter-spacing:.24em;color:var(--accent);text-transform:uppercase;
}
.cap--light .cap-en{color:#a07800}
.cap-head p{
  margin-top:12px;font-size:clamp(14px,1.4vw,16px);line-height:1.85;
  color:rgba(244,242,238,.66);
}
.cap--light .cap-head p{color:#4a4a4e}

/* galleries: css masonry，保留原始比例不裁切 */
.gal{columns:1;column-gap:14px}
@media (min-width:420px){.gal{columns:2}}
@media (min-width:1000px){.gal--3{columns:3}.gal--4{columns:3}.gal--2{columns:2}}
@media (min-width:1320px){.gal--4{columns:4}}

.shot{break-inside:avoid;margin:0 0 14px;position:relative;overflow:hidden;background:#1a1a1c;cursor:zoom-in}
.cap--light .shot{background:#e2ddd4}
.shot img{width:100%;height:auto;transition:transform .8s var(--ease)}
.shot::after{
  content:"＋";position:absolute;inset:auto 0 0 auto;margin:10px;
  width:26px;height:26px;display:grid;place-items:center;
  font:400 14px/1 var(--mono);color:var(--ink);background:var(--accent);border-radius:50%;
  opacity:0;transform:translateY(6px);transition:opacity .3s var(--ease),transform .3s var(--ease);
}
@media (hover:hover){
  .shot:hover img{transform:scale(1.03)}
  .shot:hover::after{opacity:1;transform:none}
}

/* ---------- timeline ---------- */
.timeline{border-top:1px solid var(--line)}
.timeline li{
  display:grid;gap:4px 24px;padding:clamp(18px,2.6vw,26px) 0;
  border-bottom:1px solid var(--line);
}
@media (min-width:720px){.timeline li{grid-template-columns:200px 1fr;align-items:baseline}}
.tl-date{font:500 12px/1.6 var(--mono);letter-spacing:.12em;color:var(--muted)}
.tl-body h3{font-size:clamp(17px,2vw,21px);font-weight:700;letter-spacing:-.01em}
.tl-body h3 em{font-style:normal;font:500 10px/1 var(--mono);letter-spacing:.18em;color:var(--muted);margin-left:8px}
.tl-body p{margin-top:2px;font-size:14px;color:var(--muted)}

/* ---------- contact ---------- */
.contact{padding-bottom:clamp(72px,10vw,140px)}
.contact-lead{
  font-size:clamp(22px,3.2vw,38px);line-height:1.4;font-weight:700;letter-spacing:-.02em;
  max-width:22ch;color:rgba(244,242,238,.94);
}
.contact-grid{
  display:grid;gap:0;margin-top:clamp(32px,4.6vw,60px);border-top:1px solid var(--line-d);
}
@media (min-width:800px){.contact-grid{grid-template-columns:repeat(3,minmax(0,1fr));border-top:0}}
.contact-item{
  display:flex;flex-direction:column;gap:10px;padding:clamp(18px,2.6vw,30px) 0;
  border-bottom:1px solid var(--line-d);
}
@media (min-width:800px){
  .contact-item{border-top:1px solid var(--line-d);border-bottom:0;padding-right:24px}
}
.ci-label{font:500 10px/1 var(--mono);letter-spacing:.2em;color:var(--muted-d)}
.ci-value{font-size:clamp(17px,2vw,23px);font-weight:600;letter-spacing:.01em;transition:color .25s}
a.contact-item:hover .ci-value{color:var(--accent)}
.arrow{font-style:normal;color:var(--accent)}

/* ---------- footer ---------- */
.site-foot{background:var(--ink);color:var(--muted-d);border-top:1px solid var(--line-d)}
.foot-in{
  display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;align-items:center;
  padding:22px 0;font:500 11px/1.6 var(--mono);letter-spacing:.06em;
}
.to-top{color:rgba(255,255,255,.7);transition:color .2s}
.to-top:hover{color:var(--accent)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(20px)}
.reveal.in{opacity:1;transform:none;transition:opacity .8s var(--ease),transform .8s var(--ease)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .card-media img,.shot img{transition:none}
}

/* ---------- lightbox ---------- */
.lb{
  position:fixed;inset:0;z-index:120;
  background:rgba(8,8,9,.96);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:clamp(4px,1.5vw,20px);
  padding:clamp(44px,6vw,72px) clamp(8px,2vw,28px);
}
.lb[hidden]{display:none}
.lb-stage{grid-column:2;display:flex;flex-direction:column;align-items:center;gap:12px;margin:0;min-width:0}
.lb-stage img{
  max-width:100%;max-height:calc(100svh - 170px);width:auto;height:auto;
  object-fit:contain;box-shadow:0 20px 60px rgba(0,0,0,.5);
}
.lb-stage figcaption{
  display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:center;
  font:500 11px/1.5 var(--mono);letter-spacing:.1em;color:rgba(255,255,255,.66);
}
#lbCount{color:var(--accent)}
.lb-close{
  position:absolute;top:14px;right:14px;width:40px;height:40px;
  background:none;border:1px solid rgba(255,255,255,.24);color:#fff;border-radius:50%;
  cursor:pointer;font-size:14px;line-height:1;transition:background .2s,border-color .2s;
}
.lb-close:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.5)}
.lb-nav{
  width:clamp(32px,5vw,48px);height:clamp(48px,8vw,64px);
  background:none;border:0;color:rgba(255,255,255,.55);cursor:pointer;
  font-size:32px;line-height:1;transition:color .2s;
}
.lb-nav:hover{color:var(--accent)}
.lb-prev{grid-column:1}
.lb-next{grid-column:3}

@media (max-width:600px){
  .lb{grid-template-columns:1fr;padding:56px 10px 24px}
  .lb-stage{grid-column:1}
  .lb-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:2}
  .lb-prev{left:2px}
  .lb-next{right:2px}
  .lb-stage img{max-height:calc(100svh - 150px)}
}