/* ══════════════════════════════════════════════════════════
   AI-Native Distributor — 設計系統
   高級灰白黑 × 深藍點綴 · 日式克制 · 細線 · 大量留白
   ══════════════════════════════════════════════════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#F7F8F9;
  --surface:#FFFFFF;
  --surface-2:#F1F3F5;
  --ink:#15171C;
  --ink-2:#2B2F36;
  --muted:#565B63;
  --dim:#8B9198;
  --faint:#B9BFC6;
  --line:#E4E7EB;
  --line-2:#D3D8DE;
  --navy:#1B3A5B;
  --navy-2:#28527E;
  --navy-soft:rgba(27,58,91,.055);
  --silver:#AEB6BF;

  --sans:'Noto Sans TC',sans-serif;
  --serif:'Noto Serif TC',serif;
  --mono:'Roboto Mono',ui-monospace,monospace;

  --maxw:1120px;
  --radius:10px;
  --radius-s:6px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-weight:300;line-height:1.75;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--navy);color:#fff}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,44px)}
.narrow{max-width:760px}

/* ── reveal ── */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ══ NAV ══ */
#nav{position:sticky;top:0;z-index:100;background:rgba(247,248,249,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:24px;height:64px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--serif);font-weight:600;font-size:16px;letter-spacing:.02em}
.brand-mark{display:grid;place-items:center;width:26px;height:26px;background:var(--ink);color:#fff;border-radius:6px;font-size:14px}
.brand-en{color:var(--dim);font-family:var(--mono);font-weight:400;font-size:12px}
.navlinks{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--muted)}
.navlinks a{position:relative;padding:4px 0;transition:color .2s}
.navlinks a:hover{color:var(--ink)}
.navlinks a::after{content:'';position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--navy);transition:width .28s var(--ease)}
.navlinks a:hover::after{width:100%}
.nav-cta{font-size:13px;color:var(--navy);border:1px solid var(--line-2);padding:8px 16px;border-radius:100px;transition:.25s var(--ease)}
.nav-cta:hover{background:var(--navy);color:#fff;border-color:var(--navy)}
@media(max-width:860px){.navlinks{display:none}.brand-en{display:none}.nav-inner{gap:12px}}

/* ══ shared eyebrow / mono ══ */
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.22em;color:var(--muted)}
.eyebrow .tick{width:22px;height:1px;background:var(--navy)}

/* ══ HERO ══ */
.hero{padding:clamp(80px,15vw,168px) 0 clamp(64px,10vw,120px)}
.hero .eyebrow{margin-bottom:30px}
h1{font-family:var(--serif);font-weight:700;font-size:clamp(32px,6vw,66px);line-height:1.24;letter-spacing:.005em;text-wrap:balance}
.ink-accent{color:var(--navy);position:relative}
.nowrap{white-space:nowrap}
.hero-sub{margin-top:30px;max-width:60ch;font-size:clamp(16px,2vw,19px);color:var(--muted);line-height:1.85}
.hero-tags{margin-top:38px;display:flex;flex-wrap:wrap;gap:10px}
.tagpill{font-family:var(--mono);font-size:12.5px;letter-spacing:.02em;color:var(--ink-2);background:var(--surface);border:1px solid var(--line-2);padding:8px 15px;border-radius:100px}
.hero-cta{margin-top:40px;display:flex;flex-wrap:wrap;gap:14px}
.hero-context{margin-top:52px;padding-top:26px;border-top:1px solid var(--line);font-size:13.5px;color:var(--dim);max-width:70ch;font-family:var(--sans)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:400;padding:13px 26px;border-radius:100px;transition:transform .22s var(--ease),background .22s,color .22s,border-color .22s;cursor:pointer}
.btn-solid{background:var(--ink);color:#fff}
.btn-solid:hover{background:var(--navy);transform:translateY(-2px)}
.btn-line{border:1px solid var(--line-2);color:var(--ink)}
.btn-line:hover{border-color:var(--navy);color:var(--navy);transform:translateY(-2px)}

/* ══ SECTION scaffold ══ */
.sec{padding:clamp(64px,10vw,116px) 0;border-top:1px solid var(--line)}
.sec.alt{background:var(--surface-2)}
.sec-head{display:flex;gap:20px;margin-bottom:clamp(38px,5vw,60px);max-width:760px}
.sec-no{font-family:var(--mono);font-size:13px;color:var(--faint);padding-top:8px;flex:none}
.sec-title{font-family:var(--serif);font-weight:700;font-size:clamp(23px,3.6vw,36px);line-height:1.35;letter-spacing:.01em}
.sec-lead{margin-top:14px;font-size:15.5px;color:var(--muted);line-height:1.8}

/* ══ POSITIONING / domains ══ */
.domains{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:820px){.domains{grid-template-columns:1fr}}
.domain{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;transition:.3s var(--ease)}
.domain:hover{border-color:var(--line-2);transform:translateY(-3px)}
.domain .d-en{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;color:var(--navy);text-transform:uppercase}
.domain h3{font-family:var(--serif);font-weight:600;font-size:21px;margin:10px 0 12px}
.domain p{font-size:14px;color:var(--muted)}
.intersection{margin-top:22px;background:var(--ink);color:#EDEFF2;border-radius:var(--radius);padding:clamp(30px,5vw,48px);text-align:center;position:relative;overflow:hidden}
.intersection::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 50% -20%,rgba(40,82,126,.5),transparent 60%)}
.inter-label{position:relative;font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--silver)}
.intersection p{position:relative;margin-top:14px;font-family:var(--serif);font-weight:500;font-size:clamp(18px,2.6vw,26px);line-height:1.6}

/* ══ SYSTEM / layers ══ */
.layers{display:flex;flex-direction:column;gap:14px}
.layer{display:grid;grid-template-columns:64px 1fr;gap:24px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px clamp(22px,3vw,34px);transition:.3s var(--ease);position:relative}
.layer:hover{border-color:var(--navy);transform:translateX(4px)}
.layer-tag{font-family:var(--serif);font-weight:700;font-size:30px;color:var(--navy);opacity:.5;text-align:center}
.layer-main{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px}
.layer h3{font-family:var(--serif);font-weight:600;font-size:19px}
.layer .l-en{font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;color:var(--faint);text-transform:uppercase}
.layer p{flex-basis:100%;font-size:14px;color:var(--muted);margin-top:2px}
@media(max-width:640px){.layer{grid-template-columns:44px 1fr;gap:16px;padding:20px}.layer-tag{font-size:24px}}

/* ══ PROJECTS ══ */
.projects{display:flex;flex-direction:column;gap:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .3s,box-shadow .3s,transform .3s var(--ease);overflow:hidden}
.card:hover{border-color:var(--line-2);box-shadow:0 20px 50px -32px rgba(21,23,28,.4)}
.card.flagship{border-color:var(--line-2)}
.card-head{display:flex;align-items:flex-start;gap:20px;padding:clamp(24px,3.4vw,34px);cursor:pointer}
.card-no{font-family:var(--mono);font-size:14px;color:var(--faint);padding-top:6px;flex:none}
.card-headmain{flex:1;min-width:0}
.card-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px}
.layer-pill{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--navy);background:var(--navy-soft);border:1px solid var(--line);padding:3px 10px;border-radius:100px}
.status-pill{font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:var(--muted);border:1px solid var(--line-2);padding:3px 10px;border-radius:100px}
.status-pill.live{color:#1d6b45;border-color:#bfe0cd;background:#eef8f2}
.flag-pill{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:#fff;background:var(--navy);padding:3px 10px;border-radius:100px}
.card h3{font-family:var(--serif);font-weight:700;font-size:clamp(19px,2.4vw,24px);line-height:1.4}
.card .tagline{margin-top:8px;font-size:15px;color:var(--muted);line-height:1.7}
.card-toggle{flex:none;width:34px;height:34px;border:1px solid var(--line-2);border-radius:50%;display:grid;place-items:center;color:var(--muted);transition:.3s var(--ease);margin-top:2px}
.card:hover .card-toggle{border-color:var(--navy);color:var(--navy)}
.card-toggle svg{width:16px;height:16px;stroke:currentColor;stroke-width:1.6;fill:none;transition:transform .35s var(--ease)}
.card.open .card-toggle{background:var(--navy);border-color:var(--navy);color:#fff}
.card.open .card-toggle svg{transform:rotate(45deg)}

.card-body{max-height:0;overflow:hidden;transition:max-height .5s var(--ease)}
.card-body-inner{padding:0 clamp(24px,3.4vw,34px) clamp(28px,3.4vw,36px);border-top:1px solid var(--line);margin-top:0}
.card.open .card-body-inner{padding-top:26px}
.detail-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px 32px}
@media(max-width:720px){.detail-grid{grid-template-columns:1fr;gap:18px}}
.detail{}
.detail.full{grid-column:1/-1}
.detail dt{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--navy);text-transform:uppercase;margin-bottom:6px}
.detail dd{font-size:14px;color:var(--ink-2);line-height:1.75}
.detail dd.muted{color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:2px}
.chip{font-family:var(--mono);font-size:12px;color:var(--muted);background:var(--surface-2);border:1px solid var(--line);border-radius:5px;padding:4px 10px}
.metrics{list-style:none;display:flex;flex-direction:column;gap:6px}
.metrics li{font-size:14px;color:var(--ink-2);padding-left:18px;position:relative}
.metrics li::before{content:'';position:absolute;left:0;top:10px;width:7px;height:7px;border:1px solid var(--navy);border-radius:50%}
.card-link{display:inline-flex;align-items:center;gap:7px;margin-top:20px;font-size:13.5px;color:var(--navy);font-weight:400;transition:gap .2s}
.card-link:hover{gap:11px}
.card-link svg{width:14px;height:14px;stroke:currentColor;stroke-width:1.7;fill:none}

/* ══ METHODOLOGY ══ */
.method-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:2px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
@media(max-width:900px){.method-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.method-grid{grid-template-columns:1fr}}
.method{background:var(--surface);padding:28px 24px;transition:background .3s}
.method:hover{background:var(--navy-soft)}
.method .m-no{font-family:var(--mono);font-size:12px;color:var(--navy);letter-spacing:.1em}
.method h3{font-family:var(--serif);font-weight:600;font-size:18px;margin:12px 0 10px}
.method p{font-size:13.5px;color:var(--muted);line-height:1.7}

/* ══ TIMELINE ══ */
.timeline{position:relative;padding-left:8px}
.timeline::before{content:'';position:absolute;left:8px;top:8px;bottom:8px;width:1px;background:var(--line-2)}
.mile{position:relative;padding:0 0 34px 40px}
.mile:last-child{padding-bottom:0}
.mile::before{content:'';position:absolute;left:2px;top:5px;width:13px;height:13px;background:var(--surface);border:2px solid var(--navy);border-radius:50%}
.mile:last-child::before{background:var(--navy)}
.mile .m-year{font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--navy)}
.mile h3{font-family:var(--serif);font-weight:600;font-size:19px;margin:5px 0 8px}
.mile p{font-size:14.5px;color:var(--muted);max-width:64ch;line-height:1.8}

/* ══ ARTICLES ══ */
.articles-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(max-width:820px){.articles-list{grid-template-columns:1fr}}
.article-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px;transition:.3s var(--ease)}
.article-card:hover{border-color:var(--navy);transform:translateY(-3px);box-shadow:0 20px 50px -32px rgba(21,23,28,.4)}
.article-meta{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.article-date{font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.04em}
.article-tag{font-family:var(--mono);font-size:11px;letter-spacing:.06em;padding:3px 10px;border-radius:100px;border:1px solid var(--line)}
.article-tag.tag-ai{color:var(--navy);background:var(--navy-soft);border-color:var(--line)}
.article-tag.tag-think{color:var(--muted);background:var(--surface-2)}
.article-tag.tag-biz{color:#8B5E2A;background:rgba(139,94,42,.08);border-color:var(--line)}
.article-body h3{font-family:var(--serif);font-weight:600;font-size:17.5px;line-height:1.4;margin-bottom:8px}
.article-body p{font-size:13.5px;color:var(--muted);line-height:1.7}
.article-link{display:inline-flex;align-items:center;gap:7px;margin-top:16px;font-size:13px;color:var(--navy);transition:gap .2s}
.article-card:hover .article-link{gap:11px}
.article-link svg{width:13px;height:13px;stroke:currentColor;stroke-width:1.7;fill:none}
.articles-more{margin-top:22px;text-align:center}

/* ══ ABOUT / prose ══ */
.prose p{font-size:16px;color:var(--ink-2);line-height:1.95;margin-bottom:20px}
.prose p:last-child{margin-bottom:0}
.prose strong{font-weight:500;color:var(--ink);border-bottom:1px solid var(--silver)}

/* ══ ABOUT / story trust block ══ */
.story-head{max-width:720px;margin:0 auto}
.story-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(48px,7vw,100px);align-items:start;margin-top:clamp(48px,7vh,80px)}
@media(max-width:840px){.story-grid{grid-template-columns:1fr}}
.year-badge{display:inline-block;margin-bottom:20px;font-family:var(--mono);font-size:11px;letter-spacing:.28em;color:var(--muted);border:1px solid var(--line);padding:6px 14px;text-transform:uppercase}
.story-text h3{font-family:var(--serif);font-weight:600;font-size:clamp(23px,3.2vw,32px);line-height:1.4;margin-bottom:20px}
.story-text p{color:var(--muted);font-size:clamp(15px,1.6vw,17px);line-height:2;margin-bottom:18px}
.story-text p strong{color:var(--ink);font-weight:500}
.pillar{border-top:1px solid var(--line);padding:26px 0}
.pillar:last-child{border-bottom:1px solid var(--line)}
.pillar-num{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--navy);text-transform:uppercase;margin-bottom:10px}
.pillar-title{font-family:var(--serif);font-size:19px;font-weight:600;margin-bottom:8px;line-height:1.4}
.pillar-desc{color:var(--muted);font-size:14.5px;font-weight:300;line-height:1.9}
.stat-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);margin-top:clamp(48px,7vh,80px)}
@media(max-width:640px){.stat-strip{grid-template-columns:1fr}}
.stat-item{padding:34px 28px;border-right:1px solid var(--line)}
.stat-item:last-child{border-right:none}
@media(max-width:640px){.stat-item{border-right:none;border-bottom:1px solid var(--line)}.stat-item:last-child{border-bottom:none}}
.stat-num{font-family:var(--serif);font-weight:700;font-size:clamp(40px,5.6vw,64px);line-height:1;color:var(--ink);font-variant-numeric:tabular-nums}
.stat-desc{color:var(--muted);margin-top:10px;font-size:13px;font-weight:300;letter-spacing:.03em}

/* ══ PHILOSOPHY ══ */
.philosophy{background:var(--ink);color:#E7E9ED;padding:clamp(80px,12vw,150px) 0;position:relative;overflow:hidden}
.philosophy::before{content:'';position:absolute;top:-30%;left:50%;transform:translateX(-50%);width:120%;height:80%;background:radial-gradient(ellipse at center,rgba(40,82,126,.28),transparent 62%)}
.motto{position:relative;font-family:var(--serif);font-weight:500;font-size:clamp(20px,3.2vw,31px);line-height:1.85;letter-spacing:.02em;text-align:center}
.motto-body{position:relative;margin-top:48px;max-width:640px;margin-left:auto;margin-right:auto}
.motto-body p{font-size:15px;color:#AAB0B9;line-height:1.9}
.motto-body strong{color:#fff;border-bottom-color:var(--navy-2)}

/* ══ FOOTER ══ */
.footer{background:var(--bg);border-top:1px solid var(--line);padding:clamp(64px,9vw,100px) 0 40px}
.foot-cta{text-align:center;max-width:640px;margin:0 auto}
.foot-title{font-family:var(--serif);font-weight:700;font-size:clamp(22px,3.4vw,32px);line-height:1.4}
.foot-sub{margin:16px auto 30px;font-size:15px;color:var(--muted);max-width:52ch}
.foot-links{display:flex;gap:14px;justify-content:center}
.foot-base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:64px;padding-top:26px;border-top:1px solid var(--line);font-family:var(--mono);font-size:12px;color:var(--dim);letter-spacing:.04em}