/* ============================================================
   2C-AI — Design System
   Palette: Porcelain #F6F7FB · Ink #0E1224 · Ultramarine #2236E0
            Aurora #16C2B0 · Lavender Mist #C9CFFF · Slate #5A6080
   Type: Space Grotesk (display) · Inter (body) · JetBrains Mono (utility)
   CJK: Noto Sans TC / SC
   ============================================================ */

:root{
  --porcelain:#FFFFFF;
  --tint:#F4F6FB;
  --ink:#0E1224;
  --ink-80:rgba(14,18,36,.8);
  --ink-60:rgba(14,18,36,.6);
  --ultra:#2236E0;
  --ultra-deep:#1726A8;
  --aurora:#16C2B0;
  --mist:#C9CFFF;
  --slate:#5A6080;
  --line:rgba(14,18,36,.1);
  --card:#FFFFFF;
  --radius:18px;
  --max:1180px;
  --font-display:"Space Grotesk","Noto Sans TC","Noto Sans SC",sans-serif;
  --font-body:"Inter","Noto Sans TC","Noto Sans SC",sans-serif;
  --font-mono:"JetBrains Mono","Noto Sans TC","Noto Sans SC",monospace;
  --ease:cubic-bezier(.22,.84,.32,1);
}
html[lang="zh-Hant"]{--font-display:"Noto Sans TC","Space Grotesk",sans-serif;--font-body:"Noto Sans TC","Inter",sans-serif}
html[lang="zh-Hans"]{--font-display:"Noto Sans SC","Space Grotesk",sans-serif;--font-body:"Noto Sans SC","Inter",sans-serif}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  background:var(--porcelain);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--ultra);color:#fff}
a{color:inherit;text-decoration:none}
img,svg,canvas{display:block;max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 28px}

/* ---------- Header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:90;
  transition:background .35s var(--ease),box-shadow .35s var(--ease),backdrop-filter .35s;
}
.site-header.scrolled,
.site-header.menu-open{
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 1px 0 var(--line);
}
.header-inner{display:flex;align-items:center;gap:32px;height:72px}
.logo{display:flex;align-items:center;gap:11px;font-family:var(--font-display);font-weight:700;font-size:1.16rem;letter-spacing:.02em}
.logo .mark{width:38px;height:auto;flex:none;display:block}
.site-footer .logo .mark{background:#fff;border-radius:10px;padding:4px;box-shadow:0 0 0 1px rgba(255,255,255,.14)}
.main-nav{display:flex;gap:26px;margin-left:auto}
.main-nav a{font-size:.92rem;color:var(--ink-60);transition:color .2s;position:relative;padding:6px 0}
.main-nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--ultra);transition:width .28s var(--ease)}
.main-nav a:hover{color:var(--ink)}
.main-nav a:hover::after{width:100%}
.lang-switch{display:flex;border:1px solid var(--line);border-radius:99px;overflow:hidden;background:#fff}
.lang-switch button{
  font-family:var(--font-mono);font-size:.72rem;padding:7px 13px;border:0;cursor:pointer;
  background:transparent;color:var(--slate);transition:.2s;
}
.lang-switch button[aria-pressed="true"]{background:var(--ink);color:#fff}
.lang-switch button:focus-visible{outline:2px solid var(--ultra);outline-offset:-2px}
.menu-btn{display:none;margin-left:auto;background:none;border:0;cursor:pointer;padding:8px}
.menu-btn span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;transition:.3s}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
#lattice{position:absolute;inset:0;width:100%;height:100%;z-index:0}
.hero-veil{position:absolute;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(60% 80% at 28% 50%,rgba(255,255,255,.94) 0%,rgba(255,255,255,.55) 55%,rgba(255,255,255,0) 100%)}
.hero-content{position:relative;z-index:2;padding:140px 0 100px;max-width:640px}
.eyebrow{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--ultra);display:inline-flex;align-items:center;gap:10px;margin-bottom:26px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--ultra)}
h1{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(2.6rem,5.6vw,4.4rem);line-height:1.06;letter-spacing:-.022em;
}
h1 .accent{color:var(--ultra)}
.hero-sub{margin:26px 0 40px;font-size:1.13rem;color:var(--ink-60);max-width:480px}
.cta-row{display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:.95rem;
  padding:14px 28px;border-radius:99px;transition:transform .25s var(--ease),box-shadow .25s,background .25s;
  will-change:transform;
}
.btn-primary{background:var(--ultra);color:#fff;box-shadow:0 8px 28px rgba(34,54,224,.32)}
.btn-primary:hover{background:var(--ultra-deep);transform:translateY(-2px);box-shadow:0 12px 34px rgba(34,54,224,.4)}
.btn-ghost{border:1px solid var(--line);background:rgba(255,255,255,.7);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-2px)}
.btn:focus-visible{outline:3px solid var(--mist);outline-offset:2px}
.hero-hint{
  position:absolute;left:50%;bottom:26px;transform:translateX(-50%);z-index:2;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;color:var(--slate);
  animation:drift 2.6s ease-in-out infinite;
}
@keyframes drift{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,7px)}}

/* ---------- Sections ---------- */
section{padding:110px 0}
.sec-head{max-width:640px;margin-bottom:60px}
h2{font-family:var(--font-display);font-weight:700;font-size:clamp(1.9rem,3.4vw,2.7rem);letter-spacing:-.018em;line-height:1.15;margin:14px 0 18px}
.sec-lead{color:var(--ink-60);font-size:1.06rem}

/* Vision / Mission split */
.vm-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.vm-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:44px 40px;position:relative;overflow:hidden;
}
.vm-card::before{
  content:"";position:absolute;top:0;left:0;width:100%;height:3px;
  background:linear-gradient(90deg,var(--ultra),var(--aurora));
  transform:scaleX(0);transform-origin:left;transition:transform .6s var(--ease);
}
.vm-card:hover::before{transform:scaleX(1)}
.vm-card h3{font-family:var(--font-display);font-size:1.32rem;margin-bottom:14px}
.vm-card p{color:var(--ink-60)}
.vm-tag{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;color:var(--aurora);text-transform:uppercase;display:block;margin-bottom:16px}

/* Values */
.values-band{background:var(--ink);color:#fff;border-radius:28px;padding:80px 0;position:relative;overflow:hidden}
.values-band .wrap{position:relative;z-index:1}
.values-band h2{color:#fff}
.values-band .sec-lead{color:rgba(255,255,255,.62)}
.values-band .eyebrow{color:var(--aurora)}
.values-band .eyebrow::before{background:var(--aurora)}
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.12);border-radius:14px;overflow:hidden;margin-top:54px}
.value-cell{background:var(--ink);padding:34px 28px;transition:background .3s}
.value-cell:hover{background:#161B33}
.value-cell .glyph{font-family:var(--font-display);font-size:1.7rem;color:var(--aurora);margin-bottom:14px;display:block}
.value-cell h4{font-family:var(--font-display);font-size:1.05rem;margin-bottom:9px}
.value-cell p{font-size:.88rem;color:rgba(255,255,255,.58)}
.band-grid-bg{position:absolute;inset:0;opacity:.08;z-index:0;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(70% 70% at 70% 30%,#000,transparent)}

/* Technology cards */
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.tech-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:38px 34px;transition:transform .35s var(--ease),box-shadow .35s;
}
.tech-card:hover{transform:translateY(-6px);box-shadow:0 22px 50px rgba(14,18,36,.1)}
.tech-card .chip{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;color:var(--ultra);
  border:1px solid rgba(34,54,224,.3);border-radius:99px;padding:5px 12px;display:inline-block;margin-bottom:20px;
}
.tech-card h3{font-family:var(--font-display);font-size:1.24rem;margin-bottom:12px}
.tech-card p{color:var(--ink-60);font-size:.95rem}
.tech-card ul{margin-top:18px;list-style:none}
.tech-card li{font-size:.88rem;color:var(--slate);padding:7px 0 7px 22px;position:relative;border-top:1px dashed var(--line)}
.tech-card li::before{content:"◆";position:absolute;left:0;color:var(--aurora);font-size:.6rem;top:11px}

/* Stats strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;margin-top:70px;padding-top:50px;border-top:1px solid var(--line)}
.stat .num{font-family:var(--font-display);font-weight:700;font-size:2.5rem;letter-spacing:-.02em;color:var(--ink)}
.stat .num em{font-style:normal;color:var(--ultra)}
.stat .lbl{font-size:.85rem;color:var(--slate);margin-top:5px}

/* Responsibility */
.resp-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.resp-list{list-style:none;margin-top:30px}
.resp-list li{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line)}
.resp-list .n{font-family:var(--font-mono);font-size:.74rem;color:var(--ultra);padding-top:5px;flex:none}
.resp-list h4{font-family:var(--font-display);font-size:1.04rem;margin-bottom:5px}
.resp-list p{font-size:.9rem;color:var(--ink-60)}
.orbit-visual{position:relative;aspect-ratio:1;max-width:430px;margin:0 auto}
.orbit-visual svg{width:100%;height:100%}

/* Contact */
.contact-band{background:linear-gradient(135deg,#1726A8 0%,var(--ultra) 55%,#3D55F5 100%);border-radius:28px;color:#fff;padding:80px 0;position:relative;overflow:hidden}
.contact-band h2{color:#fff}
.contact-band .sec-lead{color:rgba(255,255,255,.72)}
.contact-band .eyebrow{color:var(--mist)}
.contact-band .eyebrow::before{background:var(--mist)}
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:50px}
.contact-card{
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);border-radius:16px;
  padding:30px 28px;backdrop-filter:blur(8px);transition:background .3s,transform .3s var(--ease);
}
.contact-card:hover{background:rgba(255,255,255,.17);transform:translateY(-4px)}
.contact-card .role{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--mist);display:block;margin-bottom:12px}
.contact-card a{font-family:var(--font-display);font-size:1.06rem;font-weight:600;word-break:break-all}
.contact-card p{font-size:.86rem;color:rgba(255,255,255,.66);margin-top:8px}
.contact-glow{position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(22,194,176,.34),transparent 65%);top:-200px;right:-140px;pointer-events:none}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.66);padding:80px 0 38px;margin-top:110px}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;padding-bottom:54px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-brand .logo{color:#fff;margin-bottom:18px}
.footer-brand p{font-size:.88rem;max-width:300px}
.footer-col h5{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(255,255,255,.42);margin-bottom:18px}
.footer-col a{display:block;font-size:.9rem;padding:6px 0;color:rgba(255,255,255,.66);transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px;padding-top:30px;font-size:.8rem;color:rgba(255,255,255,.45)}
.footer-legal .links{display:flex;gap:22px;margin-left:auto}
.footer-legal a:hover{color:#fff}
.footer-disclaimer{margin-top:18px;font-size:.74rem;color:rgba(255,255,255,.32);max-width:760px;line-height:1.7}

/* ---------- Legal pages ---------- */
.legal-page{padding:160px 0 60px;max-width:820px;margin:0 auto}
.legal-page h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:10px}
.legal-meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;color:var(--slate);margin-bottom:46px;text-transform:uppercase}
.legal-page h2{font-size:1.4rem;margin:48px 0 14px;scroll-margin-top:100px}
.legal-page h3{font-family:var(--font-display);font-size:1.06rem;margin:28px 0 8px}
.legal-page p,.legal-page li{color:var(--ink-80);font-size:.97rem}
.legal-page ul{padding-left:22px;margin:12px 0}
.legal-page li{margin:7px 0}
.legal-toc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;margin-bottom:18px}
.legal-toc h5{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--slate);margin-bottom:12px}
.legal-toc a{display:block;font-size:.9rem;padding:4px 0;color:var(--ultra)}
.legal-toc a:hover{text-decoration:underline}
.legal-callout{background:rgba(34,54,224,.06);border-left:3px solid var(--ultra);border-radius:0 10px 10px 0;padding:18px 22px;margin:22px 0;font-size:.93rem}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal-d1{transition-delay:.1s}.reveal-d2{transition-delay:.2s}.reveal-d3{transition-delay:.3s}

/* ---------- Responsive ---------- */
@media(max-width:980px){
  .vm-grid,.tech-grid,.contact-cards{grid-template-columns:1fr 1fr}
  .values-grid{grid-template-columns:1fr 1fr}
  .resp-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr;gap:36px}
}
@media(max-width:680px){
  section{padding:80px 0}
  .main-nav{
    position:fixed;inset:72px 0 auto 0;background:rgba(255,255,255,.97);backdrop-filter:blur(14px);
    flex-direction:column;gap:0;padding:10px 28px 26px;transform:translateY(-130%);
    transition:transform .4s var(--ease);box-shadow:0 18px 40px rgba(14,18,36,.12);
  }
  .main-nav.open{transform:none}
  .main-nav a{padding:14px 0;border-bottom:1px solid var(--line);font-size:1rem}
  .menu-btn{display:block}
  .menu-btn.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .menu-btn.open span:nth-child(2){opacity:0}
  .menu-btn.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .lang-switch{margin-left:auto;margin-right:6px}
  .vm-grid,.tech-grid,.contact-cards,.values-grid,.footer-top{grid-template-columns:1fr}
  .hero-content{padding-top:120px}
  .hero-veil{background:rgba(255,255,255,.82)}
  .footer-legal .links{margin-left:0}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}

/* ---- Product cards: icons & status (2026-06 product refresh) ---- */
.p-icon{width:46px;height:46px;border-radius:12px;display:block;margin-bottom:14px;box-shadow:0 6px 18px rgba(14,18,36,.18)}
.chip-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.status{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ultra);border:1px solid var(--mist);background:rgba(201,207,255,.22);border-radius:99px;padding:3px 10px}
.hero-co{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.22em;color:var(--slate);margin:14px 0 2px}
.footer-plaque{margin-top:18px;width:210px;max-width:100%;height:auto;border-radius:12px;background:#fff;padding:12px 16px;display:block;box-shadow:0 10px 28px rgba(0,0,0,.35)}

/* ---- Scientific motion layer (2026-06 v3) ---- */
.flow-divider{line-height:0;margin:-6px 0;pointer-events:none}
.flow-divider svg{width:100%;height:72px;display:block}
.flow-line{stroke:var(--mist);stroke-width:1.6;stroke-dasharray:7 9;animation:flowdash 9s linear infinite;opacity:.8}
.flow-line-2{stroke:rgba(34,54,224,.18);stroke-dasharray:3 12;animation-duration:14s;animation-direction:reverse}
@keyframes flowdash{to{stroke-dashoffset:-160}}
.dot-a{fill:var(--ultra)}.dot-b{fill:var(--aurora)}.dot-c{fill:#D4AF37}
.dot{filter:drop-shadow(0 0 4px rgba(34,54,224,.45))}

.values-band{position:relative;overflow:hidden}
.values-band>*:not(.synapse){position:relative;z-index:1}
.synapse{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.55}

.tech-card{position:relative;overflow:hidden}
.tech-card::before{content:"";position:absolute;top:0;left:-45%;width:45%;height:2px;border-radius:2px;
  background:linear-gradient(90deg,transparent,var(--ultra),var(--aurora),transparent);opacity:0;transition:opacity .25s}
.tech-card:hover::before{opacity:1;animation:cardsweep 2.4s var(--ease) infinite}
@keyframes cardsweep{to{left:100%}}
.tech-card:hover{box-shadow:0 18px 44px rgba(14,18,36,.12)}
.p-icon{animation:iconfloat 4.6s ease-in-out infinite}
.tech-card:nth-child(2) .p-icon{animation-delay:-1.5s}
.tech-card:nth-child(3) .p-icon{animation-delay:-3s}
@keyframes iconfloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}

@media (prefers-reduced-motion: reduce){
  .flow-line,.tech-card:hover::before,.p-icon{animation:none}
  .flow-divider .dot{display:none}
}