/* ============ Arknight 代肝服务 — tokens & base ============ */
:root{
  /* 主题色：与用户中心 / 代理后台一致的薄荷绿 */
  --accent: #2fb98a;
  --accent-2: #2bc7b0;
  --accent-ink: #15795a;

  --bg: oklch(98.6% 0.005 162);
  --surface: #ffffff;
  --surface-2: oklch(97.2% 0.007 162);
  --surface-3: oklch(95.4% 0.009 162);

  --ink: oklch(26% 0.022 165);
  --ink-2: oklch(44% 0.018 165);
  --ink-3: oklch(58% 0.014 165);
  --line: oklch(91% 0.009 162);
  --line-2: oklch(86% 0.011 162);

  --radius: 18px;
  --radius-sm: 12px;
  --shadow-sm: 0 1px 2px rgba(20,30,55,.05), 0 1px 1px rgba(20,30,55,.04);
  --shadow-md: 0 10px 30px -12px rgba(20,40,80,.18), 0 2px 8px -4px rgba(20,40,80,.10);
  --shadow-lg: 0 30px 60px -24px rgba(20,40,80,.28), 0 8px 20px -10px rgba(20,40,80,.12);

  --maxw: 1180px;
  --font-cjk: "Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-lat: "Space Grotesk", var(--font-cjk);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-cjk);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.12;letter-spacing:-.01em;font-weight:700}
p{margin:0}
.lat{font-family:var(--font-lat)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 28px;width:100%}
section{scroll-margin-top:86px}

/* ============ buttons ============ */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-cjk);font-size:15px;font-weight:600;
  padding:13px 22px;border-radius:11px;border:1px solid transparent;
  cursor:pointer;transition:transform .18s cubic-bezier(.3,.7,.4,1),box-shadow .18s,background .18s,border-color .18s;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px)}
.btn-primary{
  background:var(--accent);color:#fff;
  box-shadow:0 8px 20px -8px color-mix(in oklch,var(--accent) 70%,transparent);
}
.btn-primary:hover{filter:saturate(1.05) brightness(1.04);box-shadow:0 12px 26px -8px color-mix(in oklch,var(--accent) 75%,transparent)}
.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent-ink);background:var(--surface-2)}
.btn svg{width:16px;height:16px}

/* ============ nav ============ */
.site-nav{
  position:sticky;top:0;z-index:50;
  background:color-mix(in oklch,var(--bg) 78%,transparent);
  backdrop-filter:blur(18px) saturate(150%);-webkit-backdrop-filter:blur(18px) saturate(150%);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--font-lat);font-weight:700;font-size:18px;letter-spacing:.02em}
.brand-mark{
  width:30px;height:30px;border-radius:9px;position:relative;flex:none;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.25),0 4px 12px -4px color-mix(in oklch,var(--accent) 70%,transparent);
}
.brand-mark::before{content:"";position:absolute;inset:8px;border-radius:4px;
  border:2px solid rgba(255,255,255,.92);border-bottom-color:transparent;border-right-color:transparent;transform:rotate(45deg)}
.brand small{color:var(--ink-3);font-family:var(--font-cjk);font-weight:500;font-size:12px;letter-spacing:0}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14.5px;color:var(--ink-2);font-weight:500;transition:color .15s;position:relative}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-cta .btn{padding:9px 17px;font-size:14px}
@media(max-width:760px){.nav-links{display:none}}

/* ============ hero shared ============ */
.hero{position:relative;overflow:hidden}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12.5px;font-weight:600;letter-spacing:.04em;color:var(--accent-ink);
  background:color-mix(in oklch,var(--accent) 10%,var(--surface));
  border:1px solid color-mix(in oklch,var(--accent) 22%,transparent);
  padding:6px 13px 6px 11px;border-radius:999px;white-space:nowrap;
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px color-mix(in oklch,var(--accent) 20%,transparent)}
.hero h1{font-size:clamp(34px,5.4vw,62px);letter-spacing:-.02em}
.hero h1 .hl{color:var(--accent)}
.hero-sub{font-size:clamp(16px,1.4vw,18.5px);color:var(--ink-2);line-height:1.7;max-width:34em}
.hero-sub code{font-family:var(--font-lat);font-size:.92em;color:var(--accent-ink);background:color-mix(in oklch,var(--accent) 9%,var(--surface));padding:1px 7px;border-radius:6px}
.hero-actions{display:flex;flex-wrap:wrap;gap:13px;align-items:center}
.pill-row{display:flex;flex-wrap:wrap;gap:9px}
.pill{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--ink-2);font-weight:500;white-space:nowrap;
  background:var(--surface);border:1px solid var(--line-2);padding:7px 13px;border-radius:999px;box-shadow:var(--shadow-sm)}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--accent-2)}

/* faint dot-grid / mesh backdrops */
.bg-grid{position:absolute;inset:0;background-image:radial-gradient(var(--line-2) 1px,transparent 1px);background-size:26px 26px;
  -webkit-mask-image:radial-gradient(120% 90% at 70% 10%,#000 30%,transparent 72%);mask-image:radial-gradient(120% 90% at 70% 10%,#000 30%,transparent 72%);opacity:.7;pointer-events:none}
.bg-orb{position:absolute;border-radius:50%;filter:blur(46px);opacity:.5;pointer-events:none}

/* hero A — split */
.heroA{padding:clamp(56px,8vw,104px) 0 clamp(64px,8vw,108px)}
.heroA .grid{display:grid;grid-template-columns:1.04fr .96fr;gap:clamp(36px,5vw,72px);align-items:center}
.heroA .copy{display:flex;flex-direction:column;gap:26px;position:relative;z-index:2}
@media(max-width:880px){.heroA .grid{grid-template-columns:1fr;gap:44px}}

/* hero B — centered */
.heroB{padding:clamp(64px,9vw,120px) 0 clamp(60px,8vw,100px);text-align:center}
.heroB .copy{display:flex;flex-direction:column;align-items:center;gap:26px;position:relative;z-index:2;max-width:880px;margin:0 auto}
.heroB .hero-sub{margin:0 auto}
.heroB .hero-actions{justify-content:center}
.heroB .pill-row{justify-content:center}
.heroB .stage{position:relative;margin-top:8px;width:100%;display:flex;justify-content:center}

/* hero C — editorial */
.heroC{padding:clamp(54px,8vw,100px) 0 clamp(60px,8vw,104px);position:relative}
.heroC .grid{display:grid;grid-template-columns:1.25fr .75fr;gap:clamp(30px,4vw,56px);align-items:end}
.heroC .copy{display:flex;flex-direction:column;gap:24px;position:relative;z-index:2;
  border-left:3px solid var(--accent);padding-left:clamp(20px,3vw,34px)}
.heroC .index{font-family:var(--font-lat);font-size:13px;letter-spacing:.16em;color:var(--ink-3);font-weight:600}
.heroC h1{font-size:clamp(38px,6.2vw,76px)}
@media(max-width:880px){.heroC .grid{grid-template-columns:1fr;gap:38px;align-items:start}}

/* ============ abstract visuals ============ */
.viz{position:relative}
.panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-lg);padding:20px;position:relative;overflow:hidden;
}
.panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.panel-head .dots{display:flex;gap:6px}
.panel-head .dots i{width:9px;height:9px;border-radius:50%;background:var(--line-2)}
.panel-head .tag{font-family:var(--font-lat);font-size:11px;letter-spacing:.1em;color:var(--ink-3);font-weight:600;text-transform:uppercase}
.task{display:flex;align-items:center;gap:13px;padding:13px 0;border-top:1px solid var(--line)}
.task:first-of-type{border-top:0}
.task .check{width:24px;height:24px;border-radius:8px;flex:none;display:grid;place-items:center;
  background:color-mix(in oklch,var(--accent) 12%,var(--surface));color:var(--accent)}
.task .check svg{width:14px;height:14px}
.task .meta{flex:1;min-width:0}
.task .meta b{display:block;font-size:13.5px;font-weight:600;color:var(--ink)}
.bar{height:6px;border-radius:999px;background:var(--surface-3);overflow:hidden;margin-top:7px}
.bar i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.task .pct{font-family:var(--font-lat);font-size:12px;color:var(--ink-3);font-weight:600;font-variant-numeric:tabular-nums}

.ring-card{position:absolute;right:-18px;bottom:-22px;width:148px;background:var(--surface);
  border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-md);padding:16px;z-index:3}
.ring{position:relative;width:84px;height:84px;margin:0 auto 8px}
.ring svg{transform:rotate(-90deg);display:block}
.ring .num{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--font-lat);font-weight:700;font-size:20px;color:var(--ink)}
.ring-card .cap{text-align:center;font-size:12px;color:var(--ink-3);font-weight:500}

/* centered floating cluster (hero B) */
.cluster{position:relative;width:min(560px,90%);height:200px;margin-top:6px}
.float-card{position:absolute;background:var(--surface);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow-md);padding:13px 16px;display:flex;align-items:center;gap:11px;font-size:13.5px;font-weight:600;color:var(--ink)}
.float-card .ico{width:30px;height:30px;border-radius:9px;flex:none;display:grid;place-items:center;
  background:color-mix(in oklch,var(--accent) 12%,var(--surface));color:var(--accent)}
.float-card .ico svg{width:16px;height:16px}
.float-card small{display:block;font-weight:500;color:var(--ink-3);font-size:11.5px}

/* encryption layers (hero C + security) */
.layers{position:relative;display:flex;flex-direction:column;gap:10px}
.layer{display:flex;align-items:center;gap:13px;background:var(--surface);border:1px solid var(--line);
  border-radius:13px;padding:14px 16px;box-shadow:var(--shadow-sm);position:relative}
.layer .lk{width:30px;height:30px;border-radius:9px;flex:none;display:grid;place-items:center;
  background:color-mix(in oklch,var(--accent) 11%,var(--surface));color:var(--accent)}
.layer .lk svg{width:15px;height:15px}
.layer b{font-size:14px;font-weight:600}
.layer span{font-size:12.5px;color:var(--ink-3)}
.layer .txt{flex:1}
.layer .badge{font-family:var(--font-lat);font-size:10.5px;font-weight:700;letter-spacing:.06em;color:var(--accent-2);
  background:color-mix(in oklch,var(--accent-2) 13%,var(--surface));padding:3px 8px;border-radius:6px}

/* ============ section heading ============ */
.section{padding:clamp(64px,8vw,108px) 0}
.section.alt{background:var(--surface-2);border-block:1px solid var(--line)}
.sec-head{max-width:640px;margin-bottom:clamp(36px,4vw,56px)}
.sec-head .eyebrow{margin-bottom:18px}
.sec-head h2{font-size:clamp(28px,3.4vw,42px);letter-spacing:-.02em}
.sec-head p{margin-top:16px;font-size:17px;color:var(--ink-2);line-height:1.7}

/* features */
.feat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
@media(max-width:760px){.feat-grid{grid-template-columns:1fr}}
.feat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px;
  box-shadow:var(--shadow-sm);transition:transform .2s cubic-bezier(.3,.7,.4,1),box-shadow .2s,border-color .2s;position:relative;overflow:hidden}
.feat:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-2)}
.feat .ico{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;margin-bottom:18px;
  background:linear-gradient(140deg,color-mix(in oklch,var(--accent) 16%,var(--surface)),color-mix(in oklch,var(--accent-2) 14%,var(--surface)));
  color:var(--accent-ink)}
.feat .ico svg{width:23px;height:23px}
.feat h3{font-size:19px;margin-bottom:9px}
.feat p{font-size:14.5px;color:var(--ink-2);line-height:1.68}
.feat .idx{position:absolute;top:22px;right:26px;font-family:var(--font-lat);font-size:13px;font-weight:700;color:var(--line-2)}

/* security */
.sec-split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,5vw,72px);align-items:center}
@media(max-width:880px){.sec-split{grid-template-columns:1fr;gap:42px}}
.assure-row{display:flex;align-items:flex-start;gap:15px;padding:20px 0;border-top:1px solid var(--line)}
.assure-row:first-of-type{border-top:0;padding-top:0}
.assure-row .ico{width:42px;height:42px;border-radius:12px;flex:none;display:grid;place-items:center;
  background:color-mix(in oklch,var(--accent) 11%,var(--surface));color:var(--accent)}
.assure-row .ico svg{width:21px;height:21px}
.assure-row h3{font-size:17px;margin-bottom:5px}
.assure-row p{font-size:14px;color:var(--ink-2);line-height:1.66}
.shield-wrap{position:relative;display:grid;place-items:center;min-height:340px}
.shield-glow{position:absolute;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,color-mix(in oklch,var(--accent) 22%,transparent),transparent 68%);filter:blur(8px)}

/* CTA strip */
.cta-strip{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border-radius:24px;
  padding:clamp(38px,5vw,64px);text-align:center;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}
.cta-strip::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.16) 1px,transparent 1px);background-size:24px 24px;opacity:.5;
  -webkit-mask-image:radial-gradient(80% 120% at 50% 0%,#000,transparent 70%);mask-image:radial-gradient(80% 120% at 50% 0%,#000,transparent 70%)}
.cta-strip h2{font-size:clamp(26px,3.4vw,40px);position:relative;z-index:1}
.cta-strip p{margin-top:14px;font-size:17px;color:rgba(255,255,255,.88);position:relative;z-index:1}
.cta-strip .hero-actions{justify-content:center;margin-top:26px;position:relative;z-index:1}
.cta-strip .btn-primary{background:#fff;color:var(--accent-ink);box-shadow:0 10px 30px -10px rgba(0,0,0,.3)}
.cta-strip .btn-ghost{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.4)}
.cta-strip .btn-ghost:hover{background:rgba(255,255,255,.2)}

/* footer */
.site-foot{border-top:1px solid var(--line);padding:46px 0 40px;color:var(--ink-3)}
.foot-inner{display:flex;justify-content:space-between;align-items:flex-start;gap:30px;flex-wrap:wrap}
.foot-inner .brand small{color:var(--ink-3)}
.foot-links{display:flex;gap:26px;flex-wrap:wrap;font-size:14px}
.foot-links a{color:var(--ink-2)}
.foot-links a:hover{color:var(--accent-ink)}
.foot-note{margin-top:26px;padding-top:22px;border-top:1px solid var(--line);font-size:12.5px;color:var(--ink-3);line-height:1.7;max-width:62em}
.foot-icp{margin-top:28px;padding-top:22px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12.5px;font-family:var(--font-lat)}
.foot-icp a{color:var(--ink-3);transition:color .15s}
.foot-icp a:hover{color:var(--accent-ink)}
.foot-icp .sep{color:var(--line-2)}
.foot-domain{font-family:var(--font-lat);color:var(--ink-2);font-weight:600}

/* entrance */
@media(prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1)}
  .reveal.in{opacity:1;transform:none}
}