/* zhenhan.link personal site. Tokens follow zhenhan/ops/PLAYBOOK.md section 10. */
:root{
  color-scheme:light;
  --bg:#f7f5f0; --surface:#fcfcfb; --surface-2:#f0eee8; --ink:#16171c; --ink-2:#52514e; --muted:#7c7a73;
  --rule:#e2dfd6; --rule-2:#d2cec3; --brand:#1E2761; --brand-soft:#e6ecfa; --on-brand:#f7f5f0;
  --shadow:0 1px 0 rgba(20,20,30,.04),0 12px 32px -18px rgba(20,24,60,.25);
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;
  --ease:cubic-bezier(.23,1,.32,1); --move:cubic-bezier(.77,0,.175,1);
  --split:.5;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;
  --bg:#111113; --surface:#1a1a19; --surface-2:#222220; --ink:#f0efec; --ink-2:#c3c2b7; --muted:#8f8d84;
  --rule:#2c2c2a; --rule-2:#3a3a37; --brand:#CADCFC; --brand-soft:#1d2236; --on-brand:#111113;
  --shadow:0 1px 0 rgba(0,0,0,.4),0 16px 40px -20px rgba(0,0,0,.8);
}}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#111113; --surface:#1a1a19; --surface-2:#222220; --ink:#f0efec; --ink-2:#c3c2b7; --muted:#8f8d84;
  --rule:#2c2c2a; --rule-2:#3a3a37; --brand:#CADCFC; --brand-soft:#1d2236; --on-brand:#111113;
  --shadow:0 1px 0 rgba(0,0,0,.4),0 16px 40px -20px rgba(0,0,0,.8);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.65 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a,button{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}
img{display:block;max-width:100%}
.skip{position:fixed;top:8px;left:8px;z-index:100;padding:10px 14px;background:var(--surface);border-radius:8px;transform:translateY(-160%)}
.skip:focus{transform:none}

/* ---------- Bar: the same on every page, kept in place by the router ---------- */
.bar{position:sticky;top:0;z-index:50;view-transition-name:bar;backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);background:color-mix(in srgb,var(--bg) 84%,transparent);border-bottom:1px solid transparent;transition:border-color 200ms}
.bar.scrolled{border-bottom-color:var(--rule)}
.bar-in{max-width:1280px;margin:0 auto;padding:0 32px;height:60px;display:flex;align-items:center;gap:12px}
.bar-name{font-size:17px;font-weight:600;letter-spacing:-.03em;margin-right:auto;transition:opacity 200ms var(--ease)}
body[data-page="home"]:not(.past-intro) .bar-name{opacity:0;pointer-events:none}
.bar-nav{display:flex;align-items:center;gap:2px}
.bar-nav>a,.menu-btn{display:block;padding:7px 11px;border-radius:8px;font-size:14px;color:var(--ink-2);transition:background 160ms,color 160ms}
.bar-nav>a:hover,.menu-btn:hover,.menu.open .menu-btn{color:var(--ink);background:var(--surface-2)}
.menu{position:relative}
.menu-btn::after{content:"";display:inline-block;width:5px;height:5px;margin:0 0 3px 7px;border:solid currentColor;border-width:0 1.5px 1.5px 0;transform:rotate(45deg);opacity:.6}
.menu-panel{position:absolute;top:calc(100% + 8px);left:-6px;min-width:272px;padding:6px;display:grid;background:var(--surface);border:1px solid var(--rule);border-radius:14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(-4px) scale(.98);transform-origin:top left;transition:opacity 160ms var(--ease),transform 160ms var(--ease),visibility 0s 160ms}
.menu-panel::before{content:"";position:absolute;left:0;right:0;top:-10px;height:10px}
.menu.open .menu-panel{opacity:1;visibility:visible;transform:none;transition-delay:0s}
.menu-panel a{display:flex;justify-content:space-between;align-items:baseline;gap:18px;padding:8px 12px;border-radius:9px;font-size:14px;color:var(--ink)}
.menu-panel a small{font-size:12px;color:var(--muted)}
.menu-panel a:hover,.menu-panel a[aria-current="page"]{background:var(--surface-2)}
.menu-panel .menu-all{margin-top:4px;border-top:1px solid var(--rule);border-radius:0 0 9px 9px;color:var(--ink-2)}
.bar-toggle{display:none;padding:7px 12px;border-radius:8px;font-size:14px;border:1px solid var(--rule-2)}
.theme-btn{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;border:1px solid var(--rule);color:var(--ink-2);margin-left:6px}
.theme-btn:hover{color:var(--ink);background:var(--surface-2)}
.theme-btn svg{width:16px;height:16px;fill:currentColor;stroke:currentColor;stroke-width:1.5}
.theme-btn circle{fill:none}

/* ---------- Intro ---------- */
.intro{max-width:1280px;margin:0 auto;padding:44px 32px 56px;display:grid;grid-template-columns:184px minmax(0,1fr);gap:44px;align-items:end}
.portrait{margin:0;aspect-ratio:4/5;border-radius:18px;overflow:hidden;background:var(--brand-soft);border:1px solid var(--rule)}
.portrait img{width:100%;height:100%;object-fit:cover}
.portrait-empty{width:100%;height:100%;display:grid;place-items:center;font-size:44px;font-weight:600;letter-spacing:-.05em;color:var(--brand);opacity:.75}
.intro-copy{min-width:0}
.intro h1{font-weight:650;font-size:clamp(46px,7vw,96px);line-height:.96;letter-spacing:-.042em;margin:0 0 20px}
.intro-bio{font-size:clamp(17px,1.5vw,20px);line-height:1.55;color:var(--ink-2);max-width:38em;margin:0;text-wrap:pretty}
.intro-school{font-size:14px;color:var(--muted);margin:12px 0 0;max-width:46em}
.intro-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.btn{display:inline-flex;align-items:center;padding:9px 18px;border-radius:999px;border:1px solid var(--rule-2);font-size:14px;font-weight:500;transition:background 160ms,transform 160ms var(--ease)}
.btn:hover{background:var(--surface-2)}
.btn:active{transform:scale(.97)}
.btn-main{background:var(--brand);border-color:var(--brand);color:var(--on-brand)}
.btn-main:hover{background:var(--brand);opacity:.88}

/* ---------- Split: two halves whose widths follow the pointer ---------- */
.split{position:relative;height:clamp(600px,calc(100svh - 60px),960px);overflow:hidden;isolation:isolate}
.half{position:absolute;top:0;bottom:0;overflow:hidden}
.art{left:0;width:calc(var(--split) * 100%);background:#1b1f2a;color:#fff;z-index:2}
.finance{right:0;width:calc((1 - var(--split)) * 100%);background:var(--surface-2);color:var(--brand)}
.half-bg{position:absolute;top:0;bottom:0;width:64vw}
.art .half-bg{left:0}
.finance .half-bg{right:0}
.half-bg img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity 420ms var(--ease),transform 900ms var(--ease)}
.art .half-bg img{filter:saturate(.7) brightness(.82);transform:scale(1.04)}
.art .half-bg img.on{opacity:calc(.42 + (var(--split) - .36) * 2);transform:none}
.art .half-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(12,14,22,.72),rgba(12,14,22,.28) 62%,rgba(12,14,22,.12)),linear-gradient(0deg,rgba(12,14,22,.45),transparent 40%)}
.finance .half-bg img{inset:14% -6% auto auto;width:74%;height:auto;object-fit:contain;background:#fff;border-radius:6px;box-shadow:0 30px 60px -30px rgba(20,24,60,.45);filter:grayscale(.9) blur(.6px);transform:rotate(-4deg) translateY(10px)}
.finance .half-bg img.on{opacity:calc(.16 + (.64 - var(--split)) * .9);transform:rotate(-3deg)}
:root[data-theme="dark"] .finance .half-bg img{filter:grayscale(1) invert(.88)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .finance .half-bg img{filter:grayscale(1) invert(.88)}}
.half-in{position:absolute;top:0;bottom:0;width:min(520px,36vw);padding:44px 40px}
.art .half-in{left:0}
.finance .half-in{right:0}
.half-title{font-weight:650;font-size:clamp(56px,7vw,112px);line-height:.9;letter-spacing:-.045em;margin:0 0 34px}
.art .half-title{opacity:calc(.5 + (var(--split) - .36) * 1.8)}
.finance .half-title{opacity:calc(.5 + (.64 - var(--split)) * 1.8)}
.seam{position:absolute;top:0;bottom:0;left:calc(var(--split) * 100%);width:1px;background:rgba(255,255,255,.4);z-index:3;pointer-events:none}

/* ---------- Slots: vertical browser-style tabs; the hovered tab turns solid and opens ---------- */
.slots{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.slot{position:relative;display:block;padding:11px 18px 11px 60px;border-radius:12px;transition:padding 260ms var(--ease),opacity 220ms var(--ease),background 220ms var(--ease),box-shadow 220ms var(--ease),color 220ms var(--ease)}
.slot-img{position:absolute;top:8px;left:14px;width:32px;height:32px;border-radius:8px;object-fit:cover;transition:top 260ms var(--ease)}
.slot-title{display:block;font-size:16px;font-weight:500;letter-spacing:-.01em;line-height:1.4;transition:font-size 260ms var(--ease)}
.slot-more{display:grid;grid-template-rows:0fr;transition:grid-template-rows 260ms var(--ease)}
.slot-more>span{overflow:hidden;display:grid;gap:5px;opacity:0;transition:opacity 200ms var(--ease)}
.slot-medium{font-size:12px;opacity:.7;padding-top:4px}
.slot-summary{font-size:14px;line-height:1.5;max-width:30em;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.art .slot{color:rgba(255,255,255,.88)}
.art .slot-img{box-shadow:0 0 0 1px rgba(255,255,255,.18)}
.finance .slot{color:var(--brand)}
.finance .slot-img{filter:grayscale(1);box-shadow:0 0 0 1px var(--rule-2)}
.slot.active{padding:14px 20px 16px 60px}
.slot.active .slot-img{top:12px}
.slot.active .slot-title{font-size:19px}
.slot.active .slot-more{grid-template-rows:1fr}
.slot.active .slot-more>span{opacity:1;transition-delay:80ms}
.art .slot.active{background:rgba(255,255,255,.95);color:#16171c;box-shadow:0 16px 40px -16px rgba(0,0,0,.6)}
.finance .slot.active{background:var(--surface);box-shadow:0 0 0 1px var(--rule-2),var(--shadow)}
.slots.has-active .slot:not(.active){opacity:.55}

/* ---------- Artwork pages: the works as browser-style tabs above the open sheet ---------- */
.tabs{max-width:1280px;margin:20px auto 14px;padding:0 32px;position:relative}
.tabs-in{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;padding:4px;margin:0 -4px;mask-image:linear-gradient(90deg,transparent,#000 12px,#000 calc(100% - 24px),transparent)}
.tabs-in::-webkit-scrollbar{display:none}
.tab{flex:0 0 auto;display:flex;align-items:center;gap:9px;padding:6px 14px 6px 6px;border-radius:10px;font-size:14px;font-weight:500;color:var(--muted);white-space:nowrap;transition:background 160ms,color 160ms,box-shadow 160ms}
.tab img{width:24px;height:24px;border-radius:6px;object-fit:cover;box-shadow:0 0 0 1px var(--rule)}
.tab:hover{color:var(--ink);background:var(--surface-2)}
.tab[aria-current="page"]{color:var(--ink);background:var(--surface);box-shadow:0 0 0 1px var(--rule-2),var(--shadow)}
.sheet{position:relative;z-index:2;margin:0 max(32px,calc((100% - 1216px) / 2));background:var(--surface);border:1px solid var(--rule-2);border-radius:16px;box-shadow:var(--shadow)}
.sheet-head{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:44px;padding:40px;align-items:start}
.sheet-copy{min-width:0}
.sheet h1{font-weight:650;font-size:clamp(30px,3.4vw,48px);line-height:1.04;letter-spacing:-.035em;margin:0;text-wrap:balance}
.sheet-medium{font-size:14px;color:var(--muted);margin:10px 0 18px}
.sheet-desc{font-size:15px;line-height:1.7;color:var(--ink-2);margin:0;max-width:40em;text-wrap:pretty}
.sheet-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.sheet-links a,.copy-link{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;border:1px solid var(--rule-2);font-size:13px;font-weight:500;transition:background 160ms}
.sheet-links a:hover,.copy-link:hover{background:var(--surface-2)}
.copy-link{color:var(--ink-2)}
.copy-link::before{content:"";width:12px;height:12px;border:1.5px solid currentColor;border-radius:3px;box-shadow:3px -3px 0 -1.5px var(--surface),3px -3px 0 0 currentColor;opacity:.7}
.copy-link.copied span{display:none}
.copy-link.copied::after{content:"Link copied"}
.sheet-hero{min-width:0}
.video{aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#111}
.video+.video{margin-top:12px}
.video iframe{display:block;width:100%;height:100%;border:0}
.still{display:block;width:100%;border-radius:12px;overflow:hidden;background:var(--surface-2);cursor:zoom-in}
.still img{width:100%;height:auto;max-height:420px;object-fit:contain}
.gallery{padding:0 40px 40px;columns:5 168px;column-gap:14px}
.gallery figure{margin:0 0 14px;break-inside:avoid}
.gallery button{display:block;width:100%;border-radius:8px;overflow:hidden;background:var(--surface-2);cursor:zoom-in}
.gallery img{width:100%;height:auto;transition:transform 300ms var(--ease),opacity 200ms}
.pager{max-width:1216px;margin:20px auto 64px;padding:0 32px;display:flex;justify-content:space-between;gap:24px}
.pager a{display:block;font-size:18px;font-weight:600;letter-spacing:-.02em;padding:10px 0}
.pager a:last-child{text-align:right}
.pager small{display:block;font-size:12px;font-weight:400;letter-spacing:0;color:var(--muted)}
.index-sheet{padding:40px}
.index-sheet h1{margin-bottom:28px}
.index-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}
.index-grid a{display:block}
.index-grid img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:10px;background:var(--surface-2)}
.index-grid span{display:flex;justify-content:space-between;gap:12px;margin-top:10px;font-weight:500}
.index-grid small{color:var(--muted);font-weight:400}
.foot{border-top:1px solid var(--rule)}
.foot-in{max-width:1280px;margin:0 auto;padding:22px 32px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.foot a:hover{color:var(--ink)}
body[data-page="home"] .foot{border-top:0}

/* ---------- Lightbox ---------- */
.lightbox{padding:0;border:0;background:transparent;max-width:100vw;max-height:100vh;width:100vw;height:100vh;overflow:hidden}
.lightbox[open]{display:grid;place-items:center}
.lightbox::backdrop{background:rgba(10,12,18,.88);backdrop-filter:blur(6px)}
.lightbox img{max-width:min(92vw,1800px);max-height:88vh;object-fit:contain;border-radius:6px}
.lightbox button{position:fixed;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.12);color:#fff;font-size:26px;line-height:1;display:grid;place-items:center}
.lightbox button:hover{background:rgba(255,255,255,.24)}
.lb-close{top:18px;right:18px}
.lb-prev{left:18px;top:50%;transform:translateY(-50%)}
.lb-next{right:18px;top:50%;transform:translateY(-50%)}

/* ---------- Hover-only niceties ---------- */
@media (hover:hover) and (pointer:fine){
  .gallery button:hover img,.still:hover img{transform:scale(1.025)}
  .index-grid a:hover img{opacity:.85}
  .pager a:hover{color:var(--ink-2)}
}

/* ---------- View transitions between pages (router) ---------- */
::view-transition-old(root),::view-transition-new(root){animation-duration:240ms;animation-timing-function:var(--ease)}
::view-transition-group(*){animation-duration:460ms;animation-timing-function:var(--move)}
#art,#finance{scroll-margin-top:60px}

/* ---------- Small screens and touch: halves stack; slots show their medium ---------- */
@media (max-width:960px){
  .sheet-head{grid-template-columns:1fr;gap:28px}
  .intro{grid-template-columns:150px minmax(0,1fr);gap:32px}
}
@media (max-width:760px),(hover:none){
  .split{height:auto;overflow:visible}
  .half{position:relative;width:auto!important;min-height:520px}
  .half-bg{width:100%}
  .half-in{position:relative;width:auto;padding:36px 20px 44px}
  .half-title{font-size:72px;opacity:1!important;margin-bottom:28px}
  .art .half-bg img.on{opacity:.62}
  .finance .half-bg img.on{opacity:.4}
  .finance .half-bg img{inset:auto -10% 6% auto;width:92%}
  .seam{display:none}
  .slot-more{grid-template-rows:1fr}
  .slot-more>span{opacity:1}
  .slot-summary{display:none}
  .slots.has-active .slot:not(.active){opacity:1}
}
@media (max-width:760px){
  .bar-in{padding:0 16px}
  .bar-toggle{display:block}
  .bar-name{opacity:1!important;pointer-events:auto!important}
  .bar-nav{display:none;position:absolute;top:60px;left:0;right:0;max-height:calc(100svh - 60px);overflow:auto;flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 20px;background:var(--bg);border-bottom:1px solid var(--rule);box-shadow:var(--shadow)}
  .bar-nav.open{display:flex}
  .bar-nav>a,.menu-btn{padding:12px 4px;font-size:16px;width:100%;text-align:left;border-radius:0;border-bottom:1px solid var(--rule)}
  .menu-btn::after{display:none}
  .menu-panel{position:static;opacity:1;visibility:visible;transform:none;min-width:0;padding:4px 0 10px;border:0;box-shadow:none;background:none}
  .menu-panel a{padding:9px 12px}
  .intro{grid-template-columns:96px minmax(0,1fr);gap:20px;padding:28px 16px 36px;align-items:center}
  .intro h1{font-size:44px;margin-bottom:0}
  .intro-copy{display:contents}
  .intro-bio,.intro-school,.intro-actions{grid-column:1/-1}
  .intro-bio{font-size:17px}
  .portrait-empty{font-size:28px}
  .tabs{margin:14px auto 10px;padding:0 16px}
  .tab{font-size:13px}
  .sheet{margin:0 16px;border-radius:14px}
  .sheet-head{padding:24px 20px}
  .sheet-desc{font-size:14px}
  .gallery{padding:0 20px 20px;columns:2 120px;column-gap:10px}
  .gallery figure{margin-bottom:10px}
  .index-sheet{padding:24px 20px}
  .index-grid{grid-template-columns:1fr 1fr;gap:14px}
  .pager{padding:0 16px;margin-bottom:40px}
  .pager a{font-size:16px}
  .foot-in{padding:20px 16px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0ms!important;animation-duration:0ms!important;scroll-behavior:auto!important}
  ::view-transition-group(*),::view-transition-old(*),::view-transition-new(*){animation:none!important}
}