/* ═══════════════════════════════════════════════════════
   徐伟龙 · Portfolio 2026
   Scroll-narrative · GSAP 3.13
   ═══════════════════════════════════════════════════════ */

/* ---------- tokens ---------- */
:root{
  --ink:      #0A0B0D;
  --ink-1:    #0D0F12;
  --ink-2:    #12141A;
  --ink-3:    #181B22;
  --tx:       #EAE7E0;
  --tx-2:     #A2A7AF;
  --tx-3:     #6C727C;
  --line:     rgba(234,231,224,.11);
  --line-2:   rgba(234,231,224,.055);
  --acc:      #E2703A;
  --acc-2:    #F09055;
  --acc-dim:  rgba(226,112,58,.13);
  --ai:       #5FD3C0;
  --ai-dim:   rgba(95,211,192,.12);
  --pad:      clamp(20px, 4.6vw, 68px);
  --maxw:     1380px;
  --sans: "PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono: "JetBrains Mono","SF Mono","Cascadia Mono",Consolas,"Courier New",monospace;
  --ease: cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink);
  color:var(--tx);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.is-loading{overflow:hidden;height:100vh}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
button{font-family:inherit}

/* film grain */
body::after{
  content:"";position:fixed;inset:0;z-index:9000;pointer-events:none;opacity:.042;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;
}

/* ---------- shared ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.sec-label{
  font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.22em;
  text-transform:uppercase;color:var(--tx-3);
  display:flex;align-items:center;gap:10px;margin-bottom:26px;
}
.sec-label::before{content:"";width:18px;height:1px;background:var(--acc);flex:none}

p,li{text-wrap:pretty}

.h2{
  font-size:clamp(28px,4.4vw,58px);
  line-height:1.18;letter-spacing:-.02em;font-weight:800;
}

/* split text base */
[data-split]{will-change:transform}
.char{display:inline-block;transform-origin:left center}
.line{display:block}

/* ═══════════ PRELOADER ═══════════ */
.loader{
  position:fixed;inset:0;z-index:10000;background:var(--ink);
  display:flex;align-items:center;justify-content:center;
}
.loader-in{width:min(520px,78vw);text-align:center}
.loader-name{
  font-family:var(--mono);font-size:clamp(13px,1.5vw,16px);letter-spacing:.42em;
  color:var(--tx-2);margin-bottom:26px;text-indent:.42em;
}
.loader-name .char{transform-origin:center bottom}
.loader-track{height:1px;background:rgba(234,231,224,.13);position:relative;overflow:hidden}
.loader-track i{position:absolute;inset:0;background:var(--acc);transform:scaleX(0);transform-origin:left}
.loader-meta{
  display:flex;justify-content:space-between;margin-top:16px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;color:var(--tx-3);
}

/* ═══════════ PROGRESS / TOPBAR / RAIL ═══════════ */
.progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:9100;background:transparent}
.progress i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--acc),var(--acc-2));
  transform:scaleX(0);transform-origin:left}

.topbar{
  position:fixed;top:0;left:0;right:0;z-index:9050;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:18px var(--pad);
  transition:background .5s var(--ease),backdrop-filter .5s var(--ease),padding .5s var(--ease);
}
.topbar.is-solid{
  background:rgba(10,11,13,.72);backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  padding-top:12px;padding-bottom:12px;
  border-bottom:1px solid var(--line-2);
}
.topbar-brand{display:flex;align-items:baseline;gap:10px}
.tb-cn{font-size:15px;font-weight:700;letter-spacing:.08em}
.tb-en{font-family:var(--mono);font-size:9.5px;letter-spacing:.24em;color:var(--tx-3)}
.topbar-nav{display:flex;gap:clamp(14px,2vw,30px);font-size:13px;color:var(--tx-2)}
.topbar-nav a{position:relative;padding:4px 0;transition:color .3s}
.topbar-nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--acc);
  transform:scaleX(0);transform-origin:right;transition:transform .4s var(--ease)}
.topbar-nav a:hover{color:var(--tx)}
.topbar-nav a:hover::after{transform:scaleX(1);transform-origin:left}


/* ═══════════ HERO ═══════════ */
.hero{
  min-height:100svh;display:flex;flex-direction:column;justify-content:space-between;
  padding-top:clamp(90px,14vh,150px);padding-bottom:clamp(24px,4vh,44px);
  position:relative;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;width:78vw;height:78vw;left:-24vw;top:-30vw;border-radius:50%;
  background:radial-gradient(circle,rgba(226,112,58,.10),transparent 62%);pointer-events:none;
}
.hero-wrap{display:grid;grid-template-columns:1fr clamp(190px,20vw,300px);gap:clamp(24px,5vw,80px);
  align-items:center;flex:1}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;color:var(--tx-3);
  text-transform:uppercase;margin-bottom:clamp(26px,4vh,52px);
}
.eb-dot{width:6px;height:6px;border-radius:50%;background:var(--acc);
  box-shadow:0 0 0 4px rgba(226,112,58,.16);animation:pulse 2.6s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(226,112,58,.14)}50%{box-shadow:0 0 0 8px rgba(226,112,58,0)}}

.hero-name{
  font-size:clamp(58px,13.5vw,190px);
  line-height:.94;font-weight:800;letter-spacing:-.02em;
  margin-bottom:clamp(10px,1.6vh,22px);
}
.hero-latin{
  font-family:var(--mono);font-size:clamp(10px,1.15vw,14px);letter-spacing:.5em;
  color:var(--acc);margin-bottom:clamp(24px,4vh,46px);text-indent:.5em;
}
.hero-lede{
  font-size:clamp(15px,1.45vw,19px);line-height:1.85;color:var(--tx-2);max-width:32em;
  margin-bottom:clamp(22px,3.6vh,38px);
}
.hero-lede b{color:var(--tx);font-weight:600;white-space:nowrap}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px}
.hero-tags li{
  font-size:12px;letter-spacing:.06em;color:var(--tx-2);
  border:1px solid var(--line);border-radius:999px;padding:6px 15px;
  transition:color .35s var(--ease),background-color .35s var(--ease),border-color .35s var(--ease);
}
.hero-tags li:hover{color:var(--ink);background:var(--acc);border-color:var(--acc)}

.hero-side{display:flex;justify-content:flex-end}
.portrait{
  margin:0;position:relative;width:100%;max-width:300px;
  border:1px solid var(--line);border-radius:2px;padding:10px;
  background:linear-gradient(180deg,rgba(255,255,255,.03),transparent);
}
.portrait img{width:100%;aspect-ratio:3/4;object-fit:cover;filter:grayscale(.28) contrast(1.02)}
.portrait-ph{display:none}
.portrait.is-empty img{display:none}
.portrait.is-empty .portrait-ph{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  aspect-ratio:3/4;background:
    repeating-linear-gradient(135deg,rgba(234,231,224,.035) 0 1px,transparent 1px 9px),
    linear-gradient(160deg,var(--ink-3),var(--ink-1));
}
.ph-char{font-size:clamp(48px,6vw,76px);font-weight:800;color:rgba(234,231,224,.10);line-height:1}
.portrait-ph em{font-style:normal;font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;
  color:var(--tx-3);text-align:center;line-height:1.9;opacity:.8}
.portrait figcaption{
  display:flex;justify-content:space-between;
  font-family:var(--mono);font-size:8.5px;letter-spacing:.16em;color:var(--tx-3);
  padding:10px 2px 2px;border-top:1px solid var(--line-2);margin-top:10px;
  gap:6px;flex-wrap:wrap;line-height:1.6;
}

.hero-foot{
  display:flex;align-items:flex-end;justify-content:space-between;gap:30px;
  padding-top:clamp(26px,4vh,44px);border-top:1px solid var(--line-2);
}
.meta-list{display:flex;flex-wrap:wrap;gap:clamp(18px,3.4vw,54px)}
.meta-list li{display:flex;flex-direction:column;gap:3px}
.meta-list em{font-style:normal;font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;color:var(--tx-3)}
.meta-list b,.meta-list a{font-size:13.5px;font-weight:500;letter-spacing:.02em;color:var(--tx-2);transition:color .3s}
.meta-list a:hover{color:var(--acc)}
.scroll-cue{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:9.5px;
  letter-spacing:.24em;color:var(--tx-3);flex:none}
.scroll-cue i{width:26px;height:1px;background:var(--tx-3);position:relative;overflow:hidden}
.scroll-cue i::after{content:"";position:absolute;inset:0;background:var(--acc);
  animation:cue 2.2s var(--ease) infinite}
@keyframes cue{0%{transform:translateX(-100%)}60%,100%{transform:translateX(100%)}}

/* ═══════════ STATEMENT ═══════════ */
.statement{background:var(--ink-1);border-top:1px solid var(--line-2)}
.statement-pin{min-height:100svh;display:flex;align-items:center;padding:clamp(70px,11vh,120px) 0}
.statement-grid{display:grid;grid-template-columns:clamp(180px,20vw,280px) 1fr;gap:clamp(28px,5vw,80px)}
.statement-job{font-size:13.5px;line-height:1.9;color:var(--tx-2);letter-spacing:.01em}
.statement-job span{display:block;margin-top:8px;font-family:var(--mono);font-size:10px;
  letter-spacing:.12em;color:var(--tx-3)}
.statement-text{
  font-size:clamp(17px,2.05vw,28px);line-height:1.72;font-weight:600;letter-spacing:-.01em;
  max-width:23em;
}
.statement-text .word{color:rgba(234,231,224,.14)}

.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-2);overflow:hidden;
  border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);
}
.stat{background:var(--ink-1);padding:clamp(26px,4vh,44px) clamp(12px,2vw,28px)}
.stat-num{
  display:block;font-family:var(--mono);font-size:clamp(30px,4.2vw,54px);font-weight:600;
  letter-spacing:-.03em;line-height:1;color:var(--tx);margin-bottom:12px;
}
.stat-num::after{content:"";display:block;width:22px;height:1px;background:var(--acc);margin-top:14px}
.stat span{font-size:12px;color:var(--tx-3);letter-spacing:.05em}

/* ═══════════ CHAPTER ═══════════ */
.chapter{
  position:relative;padding:clamp(100px,18vh,220px) 0 clamp(60px,10vh,120px);
  overflow:hidden;
}
.chapter-idx{
  font-family:var(--mono);font-size:clamp(80px,17vw,240px);font-weight:700;line-height:.8;
  color:transparent;-webkit-text-stroke:1px rgba(234,231,224,.10);
  letter-spacing:-.04em;margin-bottom:-.14em;user-select:none;
}
.chapter-title{
  font-size:clamp(40px,8vw,110px);line-height:1.02;font-weight:800;letter-spacing:-.03em;
  position:relative;z-index:1;
}
.chapter-en{
  font-family:var(--mono);font-size:11px;letter-spacing:.3em;color:var(--acc);
  margin-top:clamp(14px,2.4vh,28px);
}
.chapter-desc{
  margin-top:clamp(20px,3.4vh,38px);max-width:34em;
  font-size:clamp(14px,1.3vw,16px);color:var(--tx-2);line-height:1.9;
}
.chapter--ai .chapter-en{color:var(--ai)}
.chapter--ai::before{
  content:"";position:absolute;right:-10vw;top:10%;width:46vw;height:46vw;border-radius:50%;
  background:radial-gradient(circle,rgba(95,211,192,.09),transparent 65%);pointer-events:none;
}

/* ═══════════ FLOW ═══════════ */
.flow{position:relative;background:var(--ink-1);border-top:1px solid var(--line-2)}
.flow-sticky{height:100svh;display:flex;flex-direction:column;overflow:hidden}
.flow-head{padding:clamp(70px,11vh,120px) 0 0;display:flex;align-items:center;justify-content:space-between}
.flow-head .sec-label{margin-bottom:0}
.flow-hint{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:9.5px;
  letter-spacing:.2em;color:var(--tx-3)}
.flow-hint i{width:40px;height:1px;background:linear-gradient(90deg,var(--acc),transparent);position:relative}
.flow-viewport{flex:1;display:flex;align-items:center;overflow:hidden}
.flow-track{display:flex;align-items:center;padding:0 var(--pad);will-change:transform;transform:translateZ(0)}

.flow-intro{flex:0 0 clamp(280px,30vw,420px);padding-right:clamp(30px,4vw,70px)}
.flow-intro h3{font-size:clamp(26px,3.2vw,44px);line-height:1.16;font-weight:800;letter-spacing:-.02em;
  margin-bottom:20px}
.flow-intro p{font-size:13.5px;color:var(--tx-2);line-height:1.9;max-width:22em}

.flow-node{
  flex:0 0 clamp(270px,25vw,380px);
  height:clamp(268px,38vh,370px);
  padding:36px clamp(22px,2.6vw,42px) 0 clamp(22px,2.4vw,38px);
  border-left:1px solid var(--line);
  display:flex;flex-direction:column;justify-content:center;position:relative;
}
.flow-node::before{
  content:"";position:absolute;left:-3px;top:0;width:5px;height:5px;border-radius:50%;
  background:var(--tx-3);transition:background .4s,box-shadow .4s;
}
.flow-node.is-on::before{background:var(--acc);box-shadow:0 0 0 5px rgba(226,112,58,.14)}
.fn-idx{position:absolute;top:6px;left:clamp(22px,2.4vw,38px);
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--tx-3)}
.flow-node.is-on .fn-idx{color:var(--acc)}
.flow-node h3{
  font-size:clamp(19px,1.9vw,25px);line-height:1.34;font-weight:700;letter-spacing:-.01em;
  margin:0 0 14px;
}
.flow-node p{font-size:12.8px;color:var(--tx-2);line-height:1.95;margin-bottom:18px}
.fn-tags{display:flex;flex-wrap:wrap;gap:6px}
.fn-tags span{
  font-size:10.5px;letter-spacing:.04em;color:var(--tx-3);
  border:1px solid var(--line-2);border-radius:3px;padding:3px 8px;
}
.flow-node.is-on .fn-tags span{border-color:rgba(226,112,58,.28);color:var(--acc)}

.flow-outro{flex:0 0 clamp(240px,24vw,340px);padding-left:clamp(24px,3vw,50px);border-left:1px solid var(--line)}
.fo-line{width:44px;height:1px;background:var(--acc);margin-bottom:22px}
.flow-outro p{font-size:clamp(18px,1.8vw,24px);line-height:1.4;color:var(--tx-2);font-weight:600}
.flow-outro p b{color:var(--acc);font-weight:700}
.flow-outro span{display:block;margin-top:16px;font-family:var(--mono);font-size:9.5px;
  letter-spacing:.1em;color:var(--tx-3);line-height:2}

/* ═══════════ PILLARS ═══════════ */
.pillars{padding-top:clamp(80px,14vh,160px);position:relative}
.pillars-head{padding-bottom:clamp(40px,7vh,80px)}
.pillars-head .h2{max-width:16ch;margin-top:4px}
.pillar-stack{padding:0 var(--pad) clamp(60px,10vh,110px);max-width:var(--maxw);margin:0 auto;
  display:flex;flex-direction:column;gap:clamp(18px,3vh,34px)}

.pillar-card{
  background:linear-gradient(158deg,var(--ink-3) 0%,var(--ink-1) 68%);
  border:1px solid var(--line);border-radius:4px;
  padding:clamp(28px,4.4vw,58px);
  display:grid;grid-template-columns:auto 1fr;grid-template-areas:"idx title" "idx lead" "idx list" "idx meta";
  gap:0 clamp(20px,3.4vw,54px);
  box-shadow:0 40px 80px -50px rgba(0,0,0,.9);
  transform-origin:100% 0%;
}
.pc-idx{
  grid-area:idx;font-family:var(--mono);font-size:clamp(26px,2.6vw,38px);font-weight:600;
  color:rgba(226,112,58,.5);line-height:1;padding-top:4px;
}
.pillar-card h3{grid-area:title;font-size:clamp(21px,2.5vw,34px);line-height:1.24;font-weight:800;
  letter-spacing:-.02em;margin-bottom:14px}
.pc-lead{grid-area:lead;font-size:14.5px;color:var(--tx-2);line-height:1.85;max-width:34em;margin-bottom:22px}
.pillar-card ul{grid-area:list;display:grid;gap:9px;margin-bottom:24px}
.pillar-card li{
  position:relative;padding-left:20px;font-size:13px;color:var(--tx-2);line-height:1.8;
}
.pillar-card li::before{
  content:"";position:absolute;left:0;top:.78em;width:9px;height:1px;background:var(--acc);
}
.pc-meta{grid-area:meta;display:flex;flex-wrap:wrap;gap:8px}
.pc-meta span{
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;color:var(--tx-3);
  background:rgba(234,231,224,.035);border:1px solid var(--line-2);border-radius:3px;padding:5px 10px;
}

/* ═══════════ AGENT MATRIX ═══════════ */
.agents-block{
  padding:clamp(70px,12vh,140px) 0;
  background:var(--ink-1);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);
}
.agent-grid{
  display:grid;grid-template-columns:repeat(12,1fr);
  margin-top:clamp(36px,6vh,64px);
  border-top:1px solid var(--line-2);border-left:1px solid var(--line-2);
}
.agent-card{grid-column:span 3}
.agent-card:nth-child(n+5){grid-column:span 4}
.agent-card{
  border-right:1px solid var(--line-2);border-bottom:1px solid var(--line-2);
  padding:clamp(20px,2.4vw,32px) clamp(15px,1.8vw,26px);
  min-height:clamp(148px,19vh,188px);
  display:flex;flex-direction:column;
  background:var(--ink-1);
  transition:background .45s var(--ease);
}
.agent-card:hover{background:rgba(95,211,192,.055)}
.agent-card em{
  font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.18em;
  color:var(--ai);margin-bottom:14px;
}
.agent-card h3{
  font-size:clamp(16px,1.55vw,21px);font-weight:700;letter-spacing:-.01em;
  line-height:1.3;margin-bottom:8px;
}
.agent-card p{font-size:12.4px;line-height:1.85;color:var(--tx-3);margin-top:auto}

/* ═══════════ KNOWLEDGE ═══════════ */
.knowledge{padding:clamp(70px,12vh,140px) 0 clamp(90px,16vh,180px)}
.knowledge-wrap{display:grid;grid-template-columns:clamp(240px,26vw,360px) 1fr;gap:clamp(36px,6vw,110px);align-items:start}
.knowledge-side{will-change:transform}
.knowledge-side .h2{margin-bottom:24px}
.kn-p{font-size:13.8px;color:var(--tx-2);line-height:1.95;max-width:24em}

.chain-wrap{position:relative}
.chain{position:relative;padding-left:clamp(28px,3.4vw,52px);--chainP:0}
.chain::before{
  content:"";position:absolute;left:3px;top:8px;bottom:8px;width:1px;background:rgba(234,231,224,.10);
}
.chain::after{
  content:"";position:absolute;left:3px;top:8px;width:1px;height:calc(100% - 16px);
  background:linear-gradient(180deg,var(--ai),rgba(95,211,192,.25));
  transform:scaleY(var(--chainP));transform-origin:top;will-change:transform;
}
.chain-node{position:relative;padding:clamp(16px,2.4vh,26px) 0}
.chain-node:first-child{padding-top:0}
.cn-dot{
  position:absolute;left:calc(clamp(28px,3.4vw,52px) * -1 + 0px);top:calc(clamp(16px,2.4vh,26px) + .62em);
  width:7px;height:7px;border-radius:50%;background:var(--ink);
  border:1px solid rgba(234,231,224,.22);transition:all .5s var(--ease);
}
.chain-node:first-child .cn-dot{top:.62em}
.chain-node.is-on .cn-dot{background:var(--ai);border-color:var(--ai);box-shadow:0 0 0 5px rgba(95,211,192,.13)}
.cn-body h3{
  font-size:clamp(17px,1.75vw,23px);font-weight:700;letter-spacing:-.01em;line-height:1.4;
  margin-bottom:8px;transition:color .5s var(--ease);
}
.chain-node.is-on .cn-body h3{color:var(--ai)}
.cn-body p{font-size:13.2px;color:var(--tx-3);line-height:1.9;max-width:34em;transition:color .5s}
.chain-node.is-on .cn-body p{color:var(--tx-2)}

/* ═══════════ PLATFORMS ═══════════ */
.platforms{padding:clamp(70px,12vh,140px) 0;background:var(--ink-1);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.plat-grid{display:grid;grid-template-columns:1fr clamp(70px,8vw,130px) 1fr;align-items:start;margin-bottom:clamp(50px,8vh,90px)}
.plat{padding:clamp(24px,3vw,40px) 0}
.plat-up{padding-right:clamp(10px,2vw,30px)}
.plat-down{padding-left:clamp(10px,2vw,30px)}
.plat-tag{
  display:inline-block;font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;
  color:var(--ai);border:1px solid rgba(95,211,192,.28);border-radius:3px;padding:4px 10px;margin-bottom:22px;
}
.plat h3{font-size:clamp(26px,3.4vw,46px);font-weight:800;letter-spacing:-.025em;line-height:1;margin-bottom:8px}
.plat-sub{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:var(--tx-3);margin-bottom:26px}
.plat ul{display:grid;gap:16px}
.plat li{font-size:13.2px;color:var(--tx-2);line-height:1.9;padding-left:16px;position:relative}
.plat li::before{content:"";position:absolute;left:0;top:.85em;width:6px;height:1px;background:var(--ai)}
.plat li b{color:var(--tx);font-weight:600;display:block;margin-bottom:2px;font-size:13.5px}

.plat-link{position:relative;display:flex;flex-direction:column;align-items:center;
  justify-content:center;height:100%;min-height:230px;gap:14px}
.plat-link i{flex:1;width:1px;background:linear-gradient(180deg,transparent,rgba(95,211,192,.4),transparent);
  transform-origin:top}
.plat-link span{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;color:var(--ai);
  writing-mode:vertical-rl;white-space:nowrap;
  background:var(--ink-1);padding:8px 0;
}

.agents-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:22px}
.agent-chips{display:flex;flex-wrap:wrap;gap:8px}
.agent-chips li{
  font-size:12.5px;letter-spacing:.03em;color:var(--tx-2);
  border:1px solid var(--line);border-radius:999px;padding:8px 18px;
  background:rgba(95,211,192,.03);
  transition:color .4s var(--ease),background-color .4s var(--ease),border-color .4s var(--ease);
}
.agent-chips li:hover{color:var(--ink);background:var(--ai);border-color:var(--ai)}

/* ═══════════ DOCCHAIN ═══════════ */
.docchain{padding:clamp(80px,14vh,160px) 0}
.dc-sub{margin-top:20px;font-size:14px;color:var(--tx-2);line-height:1.9;max-width:30em}
.doc-steps{
  display:grid;grid-template-columns:repeat(5,1fr);gap:clamp(8px,1.4vw,24px);
  margin-top:clamp(40px,7vh,80px);position:relative;
}
.doc-steps li{
  position:relative;padding:26px 0 0;border-top:1px solid var(--line);
  transition:border-color .5s var(--ease);
}
.doc-steps li::before{
  content:"";position:absolute;left:0;top:-4px;width:7px;height:7px;border-radius:50%;
  background:var(--ink);border:1px solid rgba(234,231,224,.2);transition:all .5s var(--ease);
}
.doc-steps li.is-on::before{background:var(--acc);border-color:var(--acc);box-shadow:0 0 0 5px rgba(226,112,58,.14)}
.doc-steps li.is-on{border-top-color:rgba(226,112,58,.45)}
.doc-steps em{font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--tx-3);
  display:block;margin-bottom:10px}
.doc-steps li.is-on em{color:var(--acc)}
.doc-steps b{display:block;font-size:clamp(13px,1.3vw,16.5px);font-weight:700;line-height:1.4;margin-bottom:6px}
.doc-steps span{font-size:11.5px;color:var(--tx-3);line-height:1.7}
.dc-line{height:1px;background:var(--line-2);margin-top:-1px;display:none}

/* ═══════════ PROJECTS ═══════════ */
.projects{padding:clamp(70px,12vh,140px) 0}
.proj{
  display:grid;grid-template-columns:1.14fr 1fr;gap:clamp(24px,4.4vw,72px);
  align-items:center;margin-top:clamp(50px,9vh,100px);
}
.proj-rev .proj-media{order:2}
.proj-media{
  position:relative;overflow:hidden;border-radius:2px;
  height:clamp(260px,46vh,520px);
}
.proj-media img{width:100%;height:100%;object-fit:cover;opacity:0;
  transform:scale(1.06);filter:grayscale(.18)}
.proj-media .mask{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:0;animation:mkReveal 1.05s var(--ease) forwards;will-change:opacity,transform;
}
@keyframes mkReveal{from{opacity:0;transform:scale(1.16)}to{opacity:1;transform:scale(1)}}
.proj-tags{
  position:absolute;left:14px;bottom:14px;display:flex;gap:6px;flex-wrap:wrap;z-index:2;
}
.proj-tags span{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:rgba(234,231,224,.9);
  background:rgba(10,11,13,.6);backdrop-filter:blur(8px);border:1px solid rgba(234,231,224,.14);
  border-radius:3px;padding:4px 9px;
}
.proj-kicker{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--acc);margin-bottom:18px}
.proj-body h3{font-size:clamp(24px,3.2vw,44px);line-height:1.16;font-weight:800;letter-spacing:-.025em;margin-bottom:20px}
.proj-body p{font-size:14.2px;color:var(--tx-2);line-height:1.92;max-width:30em;margin-bottom:20px}
.proj-body ul{display:grid;gap:8px}
.proj-body li{position:relative;padding-left:18px;font-size:12.8px;color:var(--tx-3);line-height:1.8}
.proj-body li::before{content:"";position:absolute;left:0;top:.8em;width:8px;height:1px;background:var(--tx-3)}

/* ═══════════ EDU ═══════════ */
.edu{padding:clamp(70px,12vh,140px) 0;background:var(--ink-1);border-top:1px solid var(--line-2)}
.edu-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,6vw,110px)}
.edu-time{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--acc);margin-bottom:16px}
.edu-item h3{font-size:clamp(22px,2.6vw,34px);font-weight:800;letter-spacing:-.02em;margin-bottom:8px;line-height:1.3}
.edu-major{font-size:13.5px;color:var(--tx-2);margin-bottom:10px}
.edu-courses{font-size:12.5px;color:var(--tx-3);line-height:1.9}
.award{padding:clamp(22px,3vh,32px) 0;border-top:1px solid var(--line-2)}
.award:first-of-type{border-top:0;padding-top:0}
.aw-tag{font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;color:var(--ai);margin-bottom:12px}
.award h3{font-size:clamp(17px,1.9vw,24px);font-weight:700;line-height:1.42;letter-spacing:-.01em;margin-bottom:8px}
.aw-no{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--tx-3)}

/* ═══════════ SKILLS ═══════════ */
.skills{padding:clamp(70px,12vh,140px) 0 clamp(40px,7vh,80px);overflow:hidden}
.skill-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-2);
  border-top:1px solid var(--line);margin-top:clamp(36px,6vh,64px)}
.skill-card{background:var(--ink);padding:clamp(22px,3vw,36px) clamp(16px,2vw,28px)}
.skill-card h3{font-size:12px;font-family:var(--mono);letter-spacing:.16em;color:var(--acc);
  margin-bottom:18px;font-weight:600}
.skill-card ul{display:grid;gap:9px}
.skill-card li{font-size:13px;color:var(--tx-2);line-height:1.7}

.marquee{margin-top:clamp(50px,9vh,90px);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);
  padding:clamp(18px,2.6vh,28px) 0;overflow:hidden;white-space:nowrap}
.marquee-track{display:inline-flex;align-items:center;gap:clamp(16px,2vw,28px);will-change:transform;
  animation:mq 42s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-track span{font-size:clamp(16px,2vw,26px);font-weight:700;letter-spacing:-.01em;
  color:rgba(234,231,224,.32);transition:color .3s}
.marquee-track span:hover{color:var(--tx)}
.marquee-track i{font-style:normal;color:var(--acc);font-size:12px}
@keyframes mq{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ═══════════ CONTACT ═══════════ */
.contact{
  position:relative;padding:clamp(90px,18vh,200px) 0 clamp(90px,14vh,160px);
  overflow:hidden;border-top:1px solid var(--line-2);
}
.contact-wrap{position:relative;z-index:2}
.contact-title{
  font-size:clamp(64px,16vw,220px);line-height:.92;font-weight:800;letter-spacing:-.035em;
  margin-bottom:clamp(24px,4vh,44px);
}
.contact-sub{font-size:clamp(14px,1.35vw,17px);color:var(--tx-2);line-height:1.95;max-width:38em;margin-bottom:clamp(36px,6vh,64px)}
.contact-links{display:grid;gap:1px;background:var(--line-2);border-top:1px solid var(--line-2);max-width:760px}
.contact-links a{
  display:flex;align-items:center;gap:clamp(14px,2vw,30px);
  padding:clamp(18px,2.6vh,26px) 4px;background:var(--ink);
  transition:padding-left .4s var(--ease),background .4s;
}
.contact-links a:hover{padding-left:18px;background:rgba(226,112,58,.05)}
.contact-links em{font-style:normal;font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;
  color:var(--tx-3);flex:0 0 42px}
.contact-links b{font-size:clamp(15px,1.6vw,20px);font-weight:600;letter-spacing:.01em}
.contact-links i{font-style:normal;margin-left:auto;color:var(--acc);font-size:15px;
  transition:transform .4s var(--ease)}
.contact-links a:hover i{transform:translate(3px,-3px)}
.contact-giant{
  position:absolute;left:50%;bottom:-1.2vw;transform:translateX(-50%);
  font-family:var(--mono);font-size:13.4vw;font-weight:700;letter-spacing:-.03em;line-height:1;
  color:transparent;-webkit-text-stroke:1px rgba(234,231,224,.055);
  white-space:nowrap;pointer-events:none;user-select:none;
}

/* ═══════════ FOOTER ═══════════ */
.foot{border-top:1px solid var(--line-2);padding:28px 0}
.foot-in{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--tx-3)}
.foot-in a{transition:color .3s}
.foot-in a:hover{color:var(--acc)}

/* ═══════════ RESPONSIVE ═══════════ */

@media (max-width:1100px){
  .hero-wrap{grid-template-columns:1fr 180px}
  .statement-grid{grid-template-columns:1fr;gap:24px}
  .statement-text{max-width:32ch}
  .stats{grid-template-columns:repeat(2,1fr)}
  .knowledge-wrap{grid-template-columns:1fr;gap:36px}
  .knowledge-side{position:static}
  .skill-grid{grid-template-columns:repeat(2,1fr)}
  .agent-grid{grid-template-columns:repeat(2,1fr)}
  .agent-card,.agent-card:nth-child(n+5){grid-column:span 1}
  .agent-card:nth-child(7){grid-column:span 2}
  .doc-steps{grid-template-columns:repeat(3,1fr);row-gap:28px}
  .plat-grid{grid-template-columns:1fr;gap:0}
  .plat-link{flex-direction:row;min-height:auto;padding:20px 0}
  .plat-link i{width:auto;height:1px;flex:1;background:linear-gradient(90deg,transparent,rgba(95,211,192,.4),transparent)}
  .plat-link span{writing-mode:horizontal-tb;padding:0 10px}
  .plat-up{padding-right:0}
  .plat-down{padding-left:0}
}

@media (max-width:820px){
  body{font-size:15px}
  .topbar-nav{display:none}
  .hero{min-height:auto;padding-top:clamp(88px,16vh,130px)}
  .hero-wrap{grid-template-columns:1fr;gap:clamp(28px,5vh,44px);align-items:start}
  .hero-side{order:-1;justify-content:flex-start}
  .portrait{max-width:142px}
  .portrait-ph em{font-size:8px}
  .hero-name{font-size:clamp(52px,17vw,90px)}
  .hero-latin{letter-spacing:.34em}
  .hero-foot{flex-direction:column;align-items:flex-start;gap:24px}
  .meta-list{gap:18px 28px}
  .scroll-cue{display:none}
  .stats{grid-template-columns:1fr 1fr}
  .pillar-card{grid-template-columns:1fr;grid-template-areas:"idx" "title" "lead" "list" "meta";gap:0}
  .pc-idx{margin-bottom:14px}
  .proj{grid-template-columns:1fr;gap:26px}
  .proj-rev .proj-media{order:0}
  .proj-media{height:clamp(200px,32vh,320px)}
  .edu-grid{grid-template-columns:1fr;gap:44px}
  .skill-grid{grid-template-columns:1fr}
  .doc-steps{grid-template-columns:1fr 1fr}
  .contact-title{font-size:clamp(56px,20vw,110px)}
  .contact-giant{font-size:11.5vw;bottom:.5vw;letter-spacing:.02em}
  .chapter-idx{margin-bottom:-.1em}
  .flow-sticky{height:auto}
  .flow-viewport{overflow:visible}
  .flow-track{flex-direction:column;align-items:stretch;padding-bottom:clamp(50px,9vh,90px)}
  .flow-intro,.flow-node,.flow-outro{flex:1 1 auto;width:100%;height:auto;
    padding:26px 0 26px 22px}
  .flow-outro{border-left:0;padding-left:0;border-top:1px solid var(--line);margin-top:14px;padding-top:26px}
  .flow-node{min-height:0;justify-content:flex-start;padding-top:26px}
  .fn-idx{position:static;margin-bottom:12px}
  .flow-node::before{top:26px}
  .flow-node h3{margin:14px 0 10px}
  .flow-head{padding-top:50px;margin-bottom:10px}
}

@media (max-width:520px){
  .meta-list li{flex:0 0 45%}
  .doc-steps{grid-template-columns:1fr}
  .agent-chips li{font-size:11.5px;padding:7px 14px}
  .statement-text{font-size:clamp(17px,4.6vw,22px)}
}

/* ═══════════ REDUCED MOTION ═══════════ */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;
    transition-duration:.01ms!important}
  .proj-media img{opacity:1!important;transform:none!important}
  .proj-media .mask{display:none}
}