/* SiPhTec — site styles */
:root{
  --bg:#060b1d;--bg2:#0a1330;--panel:#0e1a3d;--panel2:#12214b;--line:#1f3166;
  --text:#e7ecff;--muted:#9aa8d6;--cyan:#22e3ff;--violet:#8b5cf6;--pink:#e05cf6;
  --grad:linear-gradient(90deg,var(--cyan),var(--violet));
  --radius:16px;--max:1200px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65;font-size:16px;
  background-image:radial-gradient(1200px 600px at 85% -10%,rgba(139,92,246,.18),transparent 60%),radial-gradient(900px 500px at -10% 10%,rgba(34,227,255,.10),transparent 60%);background-attachment:fixed}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}
h1,h2,h3{line-height:1.25;margin:0 0 .6em;letter-spacing:.01em}
h1{font-size:clamp(2rem,5vw,3.6rem);font-weight:800}
h2{font-size:clamp(1.5rem,3vw,2.3rem);font-weight:750}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em;color:var(--muted)}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.skip{position:absolute;left:-999px;top:8px;background:var(--cyan);color:#000;padding:8px 12px;border-radius:8px;z-index:100}
.skip:focus{left:8px}

/* i18n */
html[lang="zh-CN"] [data-l="en"],html[lang="en"] [data-l="zh"]{display:none!important}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(6,11,29,.78);backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid rgba(31,49,102,.7)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;font-size:1.25rem;letter-spacing:.02em}
.brand:hover{text-decoration:none}
.brand img{width:36px;height:36px}
.nav-links{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
.nav-links a{display:block;padding:8px 12px;border-radius:10px;color:var(--muted);font-size:.95rem;font-weight:550}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,.05);text-decoration:none}
.nav-links a[aria-current="page"]{color:var(--text);background:rgba(34,227,255,.10);box-shadow:inset 0 0 0 1px rgba(34,227,255,.25)}
.nav-actions{display:flex;align-items:center;gap:8px}
.lang-btn{font:inherit;font-size:.85rem;font-weight:700;color:var(--text);background:transparent;border:1px solid var(--line);border-radius:999px;padding:6px 14px;cursor:pointer}
.lang-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.menu-btn{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);background:transparent;cursor:pointer;padding:0;align-items:center;justify-content:center}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;position:relative;transition:.25s}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0}
.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}
.menu-open .menu-btn span{background:transparent}
.menu-open .menu-btn span::before{top:0;transform:rotate(45deg)}
.menu-open .menu-btn span::after{top:0;transform:rotate(-45deg)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:700;font-size:.98rem;border:1px solid transparent;cursor:pointer;font-family:inherit;transition:transform .15s,box-shadow .2s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--grad);color:#050a1a;box-shadow:0 8px 30px -8px rgba(34,227,255,.55)}
.btn-ghost{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--cyan)}

/* hero */
.hero{position:relative;overflow:hidden;padding:96px 0 88px;border-bottom:1px solid var(--line)}
.hero .wg-bg{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.9}
.hero .container{position:relative;z-index:1}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.82rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);padding:6px 12px;border:1px solid rgba(34,227,255,.3);border-radius:999px;background:rgba(34,227,255,.06);margin-bottom:22px}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px var(--cyan)}
.hero h1{max-width:900px}
.hero .lead{font-size:clamp(1.05rem,1.6vw,1.25rem);max-width:760px;color:#c3cdf2}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.page-hero{padding:72px 0 56px}
.page-hero h1{font-size:clamp(1.9rem,4vw,3rem)}

/* sections */
section{padding:84px 0}
.section-head{max-width:760px;margin-bottom:40px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{font-size:.8rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--violet);margin-bottom:10px;display:block}
.alt{background:linear-gradient(180deg,rgba(14,26,61,.5),rgba(6,11,29,0));border-top:1px solid rgba(31,49,102,.6)}

/* grid & cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}.g5{grid-template-columns:repeat(5,1fr)}
.card{position:relative;background:linear-gradient(180deg,rgba(18,33,75,.85),rgba(14,26,61,.75));border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:border-color .2s,transform .2s,box-shadow .2s;overflow:hidden}
.card::after{content:"";position:absolute;left:0;top:0;height:2px;width:100%;background:var(--grad);opacity:0;transition:opacity .2s}
.card:hover{border-color:rgba(34,227,255,.45);transform:translateY(-3px);box-shadow:0 18px 40px -20px rgba(34,227,255,.35)}
.card:hover::after{opacity:1}
.card p{margin-bottom:.6em;font-size:.96rem}
.card .num{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.8rem;color:var(--cyan);letter-spacing:.1em;margin-bottom:12px;display:block}
.icon{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;background:rgba(34,227,255,.08);border:1px solid rgba(34,227,255,.25);margin-bottom:16px}
.icon svg{width:26px;height:26px}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px;padding:0;list-style:none}
.tags li{font-size:.78rem;padding:3px 10px;border-radius:999px;background:rgba(139,92,246,.12);border:1px solid rgba(139,92,246,.3);color:#cdbcff}
.card ul.bul{margin:.4em 0 0;padding-left:1.1em;color:var(--muted);font-size:.94rem}
.card ul.bul li{margin:.2em 0}
.note{font-size:.88rem;color:var(--muted);border-left:3px solid var(--violet);padding:10px 14px;background:rgba(139,92,246,.07);border-radius:0 10px 10px 0;margin-top:28px}
.badge-ph{display:inline-block;font-size:.75rem;font-weight:800;letter-spacing:.06em;padding:3px 10px;border-radius:6px;background:rgba(245,158,11,.14);border:1px dashed #f59e0b;color:#fbbf24;margin-bottom:12px}

/* stats / pillars */
.pillars .card{text-align:left}
.pill-num{font-size:2rem;font-weight:800}

/* flow */
.flow-wrap{background:rgba(14,26,61,.6);border:1px solid var(--line);border-radius:var(--radius);padding:24px;overflow-x:auto}
.flow-wrap svg{display:block;min-width:760px;width:100%;height:auto}

/* CTA band */
.cta-band{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:24px;padding:56px 40px;background:radial-gradient(600px 300px at 90% 0,rgba(139,92,246,.35),transparent 70%),radial-gradient(500px 300px at 0 100%,rgba(34,227,255,.2),transparent 70%),var(--panel);text-align:center}
.cta-band p{max-width:640px;margin:0 auto 24px}

/* form */
.form{display:grid;gap:16px}
.field{display:grid;gap:6px}
.field label{font-weight:650;font-size:.92rem}
.field input,.field select,.field textarea{font:inherit;color:var(--text);background:#0a1433;border:1px solid var(--line);border-radius:12px;padding:12px 14px;width:100%}
.field textarea{min-height:140px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,227,255,.18)}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:#f87171}
.err{color:#fca5a5;font-size:.84rem;min-height:1.1em}
.form-status{font-size:.92rem;color:var(--cyan);min-height:1.2em}
.req{color:var(--pink)}
.info-list{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.info-list li{display:flex;gap:12px;align-items:flex-start}
.info-list strong{display:block;color:var(--text)}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:56px 0 32px;background:#050919;margin-top:40px}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
.foot h4{margin:0 0 12px;font-size:.95rem}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.foot a{color:var(--muted);font-size:.92rem}
.foot a:hover{color:var(--cyan)}
.copyright{margin-top:40px;padding-top:20px;border-top:1px solid rgba(31,49,102,.6);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:.85rem;color:#7382b3}

/* waveguide animation */
.wg{fill:none;stroke-linecap:round}
.wg-base{stroke:rgba(80,110,200,.22);stroke-width:2}
.wg-pulse{stroke-width:2.5;stroke-dasharray:60 900;animation:flow 6s linear infinite;filter:drop-shadow(0 0 6px rgba(34,227,255,.8))}
.wg-pulse.d2{animation-delay:-2s;animation-duration:7.5s}
.wg-pulse.d3{animation-delay:-4s;animation-duration:9s}
.ring{fill:none;stroke:rgba(139,92,246,.55);stroke-width:2}
.ring-glow{fill:none;stroke:url(#gc);stroke-width:2.5;animation:ringpulse 3.2s ease-in-out infinite;transform-box:fill-box;transform-origin:center}
@keyframes flow{from{stroke-dashoffset:960}to{stroke-dashoffset:0}}
@keyframes ringpulse{0%,100%{opacity:.25}50%{opacity:1}}
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}.reveal{opacity:1;transform:none}}

/* responsive */
@media (max-width:1080px){.g5{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:960px){
  .menu-btn{display:inline-flex}
  .nav-links{position:fixed;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;padding:12px 16px 20px;background:#070d22;box-shadow:0 20px 40px -10px rgba(0,0,0,.6);border-bottom:1px solid var(--line);transform:translateY(-8px);opacity:0;visibility:hidden;transition:.2s}
  .menu-open .nav-links{transform:none;opacity:1;visibility:visible}
  .nav-links a{padding:12px 14px;font-size:1rem}
  .g3{grid-template-columns:repeat(2,1fr)}
  .foot{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .container{padding:0 18px}
  section{padding:60px 0}
  .hero{padding:64px 0 60px}
  .g2,.g3,.g4,.g5{grid-template-columns:1fr}
  .foot{grid-template-columns:1fr}
  .cta-band{padding:40px 20px}
  .card{padding:22px}
}