/* =========================================================
   圆弧派 ARCPI — main.css  v1.0.0
   ========================================================= */
:root{
  --bg:#06080c;
  --bg-2:#0a0d13;
  --surface:rgba(255,255,255,.028);
  --surface-2:rgba(255,255,255,.05);
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.14);
  --text:#eef2f7;
  --text-2:rgba(226,232,242,.66);
  --text-3:rgba(226,232,242,.42);
  --accent:#5aa8ff;
  --accent-2:#7ef0ff;
  --accent-3:#9b8cff;
  --grad:linear-gradient(100deg,#4f8cff 0%,#7ef0ff 55%,#c9b8ff 100%);
  --radius:12px;
  --wrap:1200px;
  --gutter:clamp(20px,4vw,48px);
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.7,.1,1);
  --nav-h:68px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--nav-h)}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.6 var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;text-rendering:optimizeLegibility}
img,svg,canvas{display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,blockquote,dl,dd,ul{margin:0;padding:0}
ul{list-style:none}
i{font-style:normal}
::selection{background:rgba(90,168,255,.35);color:#fff}
:focus-visible{outline:2px solid var(--accent-2);outline-offset:3px;border-radius:6px}
.mono{font-family:var(--mono);letter-spacing:.04em}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.skip{position:fixed;left:16px;top:12px;z-index:100;background:#fff;color:#000;padding:8px 14px;border-radius:8px;transform:translateY(-300%);opacity:0}
.skip:focus{transform:none;opacity:1}
.br-sm{display:none}

/* ---------- NAV ---------- */
.nav{position:fixed;inset:0 0 auto;z-index:50;height:var(--nav-h);transition:background .4s var(--ease),border-color .4s var(--ease),backdrop-filter .4s;border-bottom:1px solid transparent}
.nav.is-solid{background:rgba(6,8,12,.72);backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);border-bottom-color:var(--line)}
.nav__inner{height:100%;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:#fff}
.brand__mark{width:30px;height:30px;object-fit:contain}
.brand__text{font-weight:600;font-size:17px;letter-spacing:.06em;display:flex;align-items:baseline;gap:8px}
.brand__text em{font-style:normal;font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--text-3);font-weight:500}
.nav__links{display:flex;align-items:center;gap:6px}
.nav__links a{position:relative;padding:10px 14px;font-size:14.5px;color:var(--text-2);border-radius:8px;transition:color .25s}
.nav__links a:hover,.nav__links a.is-active{color:#fff}
.nav__links a[data-nav]::after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:1px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.nav__links a.is-active::after{transform:scaleX(1)}
.nav__cta{margin-left:10px;color:#fff!important;border:1px solid var(--line-2);background:var(--surface);display:inline-flex;gap:6px;align-items:center;transition:border-color .25s,background .25s!important}
.nav__cta:hover{border-color:rgba(126,240,255,.5);background:rgba(126,240,255,.06)}
.nav__toggle{display:none;width:44px;height:44px;border:0;background:transparent;cursor:pointer;position:relative;margin-right:-10px}
.nav__toggle span{position:absolute;left:12px;right:12px;height:1.5px;background:#fff;transition:transform .35s var(--ease),top .35s var(--ease)}
.nav__toggle span:first-child{top:17px}
.nav__toggle span:last-child{top:25px}
.nav.is-open .nav__toggle span:first-child{top:21px;transform:rotate(45deg)}
.nav.is-open .nav__toggle span:last-child{top:21px;transform:rotate(-45deg)}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;overflow:hidden;isolation:isolate;background:radial-gradient(1200px 700px at 72% 45%,rgba(60,110,255,.12),transparent 60%),var(--bg)}
.hero__gl{position:absolute;inset:0;width:100%;height:100%;z-index:-2;opacity:0;transition:opacity 1.6s var(--ease)}
.hero__gl.is-ready{opacity:1}
.hero__grid{position:absolute;inset:0;z-index:-3;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;mask-image:radial-gradient(ellipse 70% 60% at 50% 45%,#000 20%,transparent 75%);-webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 45%,#000 20%,transparent 75%);opacity:.55}
.hero__vignette{position:absolute;inset:0;z-index:-1;pointer-events:none;background:linear-gradient(90deg,rgba(6,8,12,.85) 0%,rgba(6,8,12,.35) 45%,transparent 70%),linear-gradient(0deg,var(--bg) 0%,transparent 22%)}
.hero__content{padding-top:var(--nav-h);padding-bottom:64px;position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:14px;color:var(--text-2);padding:7px 14px 7px 12px;border:1px solid var(--line-2);border-radius:999px;background:rgba(255,255,255,.03);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 0 0 rgba(126,240,255,.6);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(126,240,255,.55)}70%{box-shadow:0 0 0 9px rgba(126,240,255,0)}100%{box-shadow:0 0 0 0 rgba(126,240,255,0)}}
.hero__title{margin-top:28px;font-size:clamp(44px,8.2vw,112px);line-height:1.04;font-weight:700;letter-spacing:.02em}
.hero__title .line{display:block}
.line--accent{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;padding-bottom:.06em}
.hero__sub{margin-top:28px;max-width:560px;font-size:clamp(16px,1.5vw,19px);color:var(--text-2);line-height:1.75}
.hero__actions{margin-top:40px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 24px;border-radius:10px;font-size:15px;font-weight:500;transition:transform .3s var(--ease),background .3s,border-color .3s,box-shadow .3s}
.btn i{transition:transform .3s var(--ease)}
.btn:hover i{transform:translateX(3px)}
.btn--primary{background:#fff;color:#05070a}
.btn--primary:hover{box-shadow:0 8px 30px -6px rgba(126,240,255,.45);transform:translateY(-1px)}
.btn--ghost{border:1px solid var(--line-2);color:#fff;background:rgba(255,255,255,.02)}
.btn--ghost:hover{border-color:rgba(255,255,255,.35);background:rgba(255,255,255,.05)}

.hud{position:absolute;z-index:2;font-size:11px;color:var(--text-3);pointer-events:none}
.hud--tl{top:calc(var(--nav-h) + 22px);right:var(--gutter);letter-spacing:.2em}
.hud--br{right:var(--gutter);bottom:36px;display:grid;gap:6px;text-align:right}
.hud--br div{display:flex;gap:14px;justify-content:flex-end}
.hud--br span{letter-spacing:.2em}
.hud--br b{font-weight:500;color:var(--text-2);min-width:64px;font-variant-numeric:tabular-nums}
.scroll-cue{position:absolute;left:50%;bottom:28px;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:10px;font-size:10px;letter-spacing:.3em;color:var(--text-3);padding:6px}
.scroll-cue i{width:1px;height:40px;background:linear-gradient(var(--accent-2),transparent);animation:cue 2.2s var(--ease) infinite;transform-origin:top}
@keyframes cue{0%{transform:scaleY(0);opacity:1}60%{transform:scaleY(1);opacity:1}100%{transform:scaleY(1);opacity:0}}

/* ---------- SECTIONS ---------- */
.section{position:relative;padding:clamp(88px,12vw,148px) 0}
.section--alt{background:linear-gradient(180deg,transparent,rgba(255,255,255,.015) 20%,rgba(255,255,255,.015) 80%,transparent)}
.section::before{content:"";position:absolute;top:0;left:var(--gutter);right:var(--gutter);max-width:calc(var(--wrap) - 2*var(--gutter));margin:0 auto;height:1px;background:linear-gradient(90deg,transparent,var(--line-2),transparent)}
.sec-head{margin-bottom:clamp(40px,6vw,64px);max-width:640px}
.sec-idx{font-size:12px;color:var(--accent-2);letter-spacing:.24em;margin-bottom:16px}
.sec-head h2{font-size:clamp(30px,4.2vw,48px);line-height:1.15;font-weight:650;letter-spacing:.02em}
.sec-desc{margin-top:16px;color:var(--text-2);font-size:17px}
.tag{display:inline-block;font-size:11px;letter-spacing:.18em;color:var(--text-3);padding:4px 8px;border:1px solid var(--line);border-radius:6px}

/* spotlight hover */
[data-spot]{position:relative;--mx:50%;--my:50%}
[data-spot]::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .4s;background:radial-gradient(420px circle at var(--mx) var(--my),rgba(126,200,255,.10),transparent 45%)}
[data-spot]::after{content:"";position:absolute;inset:-1px;border-radius:inherit;pointer-events:none;padding:1px;opacity:0;transition:opacity .4s;background:radial-gradient(300px circle at var(--mx) var(--my),rgba(126,240,255,.55),transparent 50%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
[data-spot]:hover::before,[data-spot]:hover::after{opacity:1}

/* sites */
.sites{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.site-card{display:flex;flex-direction:column;padding:28px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);transition:transform .5s var(--ease),border-color .3s}
.site-card:hover{transform:translateY(-4px)}
.site-card__top{display:flex;justify-content:space-between;align-items:center}
.status{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--text-2)}
.status i{width:6px;height:6px;border-radius:50%;background:#46d483;box-shadow:0 0 10px #46d483}
.site-card h3{margin-top:36px;font-size:24px;font-weight:600}
.site-card__motto{margin-top:8px;color:var(--text-2);font-size:15px}
.metrics{margin-top:32px;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);padding-top:20px;gap:8px}
.metrics dt{font-size:12px;color:var(--text-3);margin-bottom:6px}
.metrics dd{display:flex;align-items:baseline;gap:3px}
.metrics b{font-family:var(--mono);font-weight:500;font-size:clamp(18px,1.7vw,22px);font-variant-numeric:tabular-nums;color:#fff;letter-spacing:-.01em}
.metrics small{font-size:12px;color:var(--text-3)}
.site-card__link{margin-top:28px;padding-top:4px;display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:13px;color:var(--text-2);min-height:44px;transition:color .25s;align-self:flex-start}
.site-card__link:hover{color:var(--accent-2)}

/* bento */
.bento{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(240px,auto);gap:20px}
.tile{display:flex;flex-direction:column;justify-content:flex-end;padding:28px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);overflow:hidden;transition:transform .5s var(--ease)}
.tile:hover{transform:translateY(-4px)}
.tile--wide{grid-column:span 2}
.tile__viz{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.9}
.tile__body{position:relative;z-index:1}
.tile h3{margin-top:16px;font-size:21px;font-weight:600}
.tile p{margin-top:8px;color:var(--text-2);font-size:15px;max-width:34ch}
.tile__arrow{position:absolute;top:22px;right:24px;z-index:1;width:36px;height:36px;display:grid;place-items:center;border:1px solid var(--line-2);border-radius:50%;font-size:14px;color:var(--text-2);transition:transform .4s var(--ease),color .3s,border-color .3s,background .3s}
.tile:hover .tile__arrow{transform:rotate(45deg);color:#05070a;background:#fff;border-color:#fff}
.tile__code{position:relative;z-index:1;margin-top:18px;font-size:11.5px;color:var(--accent-2);background:rgba(126,240,255,.06);border:1px solid rgba(126,240,255,.15);border-radius:6px;padding:8px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tile--wide .tile__body{max-width:56%}

/* motto */
.motto{position:relative;min-height:88vh;display:flex;align-items:center;overflow:hidden;isolation:isolate;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.motto__canvas{position:absolute;inset:0;width:100%;height:100%;z-index:-1}
.motto__inner{padding-top:96px;padding-bottom:96px}
.motto blockquote{margin-top:28px;font-size:clamp(34px,6.4vw,88px);font-weight:700;line-height:1.22;letter-spacing:.04em}
.motto blockquote p span{display:inline-block}
.motto blockquote p:nth-child(2){color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.55)}
.motto__src{margin-top:32px;color:var(--text-3);font-size:13px}

/* index */
.index-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;border-top:1px solid var(--line)}
.index-col{padding-top:28px}
.index-col h3{font-size:12px;font-weight:500;color:var(--text-3);letter-spacing:.2em;margin-bottom:12px}
.index-col a{display:flex;align-items:center;justify-content:space-between;min-height:44px;color:var(--text-2);border-bottom:1px solid transparent;transition:color .25s,padding .35s var(--ease);font-size:16px;max-width:240px}
.index-col a i{font-size:13px;opacity:0;transform:translateX(-6px);transition:opacity .3s,transform .3s var(--ease)}
.index-col a:hover{color:#fff;padding-left:6px}
.index-col a:hover i{opacity:1;transform:none}

.kin{margin-top:clamp(64px,8vw,96px)}
.kin__label{font-size:12px;color:var(--text-3);letter-spacing:.2em;margin-bottom:20px}
.marquee{overflow:hidden;mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);-webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent)}
.marquee__track{display:flex;gap:12px;width:max-content;animation:marquee 40s linear infinite}
.marquee:hover .marquee__track{animation-play-state:paused}
.marquee a{flex:none;padding:12px 22px;border:1px solid var(--line);border-radius:10px;color:var(--text-2);font-size:15px;transition:color .25s,border-color .25s,background .25s}
.marquee a:hover{color:#fff;border-color:var(--line-2);background:var(--surface-2)}
@keyframes marquee{to{transform:translateX(calc(-50% - 6px))}}

/* footer */
.footer{border-top:1px solid var(--line);padding:40px 0 calc(40px + env(safe-area-inset-bottom))}
.footer__inner{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.footer__brand p{margin-top:8px;color:var(--text-3);font-size:14px}
.footer__meta{display:flex;gap:20px;flex-wrap:wrap;font-size:12px;color:var(--text-3)}
.footer__meta a:hover{color:var(--text)}

/* reveal */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity 1s var(--ease),transform 1s var(--ease);transition-delay:var(--d,0s)}
.js .reveal.is-in{opacity:1;transform:none}

/* ---------- RESPONSIVE ---------- */
@media (max-width:1080px){
  .bento{grid-template-columns:repeat(2,1fr)}
  .index-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .sites{grid-template-columns:1fr 1fr}
  .sites .site-card:last-child{grid-column:span 2}
  .hud--tl{display:none}
}
@media (min-width:761px) and (max-aspect-ratio:5/6){
  .hero{align-items:flex-end}
  .hero__content{padding-bottom:140px}
  .hero__vignette{background:linear-gradient(0deg,var(--bg) 0%,rgba(6,8,12,.7) 35%,rgba(6,8,12,0) 65%)}
}
@media (max-width:760px){
  :root{--nav-h:60px}
  .nav__toggle{display:block}
  .nav__links{position:fixed;top:var(--nav-h);left:0;right:0;height:calc(100vh - var(--nav-h));height:calc(100dvh - var(--nav-h));flex-direction:column;align-items:stretch;gap:0;padding:16px var(--gutter) 32px;background:rgba(6,8,12,.96);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .35s var(--ease),transform .35s var(--ease),visibility .35s}
  .nav.is-open{background:rgba(6,8,12,.96)}
  .nav.is-open .nav__links{opacity:1;visibility:visible;transform:none}
  .nav__links a{font-size:22px;padding:18px 0;border-bottom:1px solid var(--line);border-radius:0;color:var(--text)}
  .nav__links a[data-nav]::after{display:none}
  .nav__cta{margin:24px 0 0;justify-content:center;border-radius:10px!important;font-size:17px!important}
  .hero{align-items:flex-end}
  .hero__vignette{background:linear-gradient(0deg,var(--bg) 0%,rgba(6,8,12,.7) 38%,rgba(6,8,12,0) 70%)}
  .hero__content{padding-bottom:116px}
  .hero__sub{font-size:15px}
  .hud--br,.scroll-cue{display:none}
  .br-sm{display:block}
  .btn{flex:1 1 auto}
  .sites{grid-template-columns:1fr}
  .sites .site-card:last-child{grid-column:auto}
  .bento{grid-template-columns:1fr;grid-auto-rows:auto}
  .tile,.tile--wide{grid-column:auto;min-height:0;padding-top:80px}
  .tile:has(.tile__viz){min-height:260px}
  .tile:has([data-viz=album]){min-height:340px}
  .tile--wide .tile__body{max-width:none}
  .tile--wide{min-height:300px}
  .motto{min-height:auto}
  .index-grid{grid-template-columns:1fr 1fr;gap:8px 20px}
  .footer__inner{flex-direction:column;align-items:flex-start}
}
@media (max-width:420px){
  .site-card,.tile{padding:24px}
  .index-grid{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .js .reveal{opacity:1;transform:none}
}