/* ============ 艺萌官网 · 共享设计系统（子页面） ============ */
@font-face{font-family:'Noto Sans SC';src:url('../fonts/notosanssc.woff2') format('woff2');font-weight:100 900;font-style:normal;font-display:swap}
@font-face{font-family:'Noto Serif SC';src:url('../fonts/notoserifsc.woff2') format('woff2');font-weight:100 900;font-style:normal;font-display:swap}
:root{
  --bg:#05070d;
  --bg2:#0a0f1c;
  --panel:rgba(13,20,38,.72);
  --panel2:rgba(20,30,56,.55);
  --line:rgba(0,242,255,.16);
  --line2:rgba(168,85,247,.2);
  --cyan:#00f2ff;
  --purple:#a855f7;
  --pink:#ff2a6d;
  --gold:#ffd166;
  --ink:#eaf2ff;
  --muted:#8fa3c8;
  --muted2:#6e82a8;
  --serif:'Noto Serif SC','Songti SC','SimSun',serif;
  --sans:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --grad:linear-gradient(120deg,var(--cyan),var(--purple) 55%,var(--pink));
  --gold-grad:linear-gradient(120deg,var(--gold),#ff8c42);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.75;overflow-x:hidden;-webkit-font-smoothing:antialiased}
::selection{background:rgba(0,242,255,.25)}
a{color:inherit}
/* 背景层 */
.bg-scene{position:fixed;inset:0;z-index:-3;overflow:hidden;background:radial-gradient(1200px 700px at 75% -10%,rgba(168,85,247,.14),transparent 60%),radial-gradient(1000px 600px at 10% 110%,rgba(0,242,255,.1),transparent 60%),linear-gradient(180deg,#05070d,#080d1a 55%,#0a0f1c)}
.bg-mountains{position:fixed;left:0;right:0;bottom:0;z-index:-2;height:46vh;opacity:.55}
.bg-grid{position:fixed;inset:0;z-index:-1;background-image:linear-gradient(rgba(0,242,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(0,242,255,.05) 1px,transparent 1px);background-size:64px 64px;-webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 20%,transparent 75%);mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 20%,transparent 75%)}
.aurora{position:fixed;width:560px;height:560px;border-radius:50%;filter:blur(130px);opacity:.16;pointer-events:none;z-index:-1}
.aurora.a1{top:-140px;left:-120px;background:var(--cyan)}
.aurora.a2{top:30%;right:-180px;background:var(--purple)}
.aurora.a3{bottom:-160px;left:24%;background:var(--pink)}
.wrap{max-width:1180px;margin:0 auto;padding:0 26px}
section{position:relative;padding:88px 0}
section:first-of-type{padding-top:150px}
.sec-head{text-align:center;margin-bottom:56px}
.sec-tag{display:inline-block;font-size:12.5px;letter-spacing:4px;color:var(--cyan);padding:7px 20px;border:1px solid rgba(0,242,255,.35);border-radius:999px;margin-bottom:20px;text-transform:uppercase;background:rgba(0,242,255,.05);box-shadow:0 0 18px rgba(0,242,255,.15) inset}
.sec-title{font-family:var(--serif);font-size:clamp(30px,4.4vw,46px);font-weight:900;letter-spacing:2px;line-height:1.25;margin-bottom:16px}
.sec-title .hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-title .hl-gold{background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-desc{max-width:760px;margin:0 auto;color:var(--muted);font-size:15.5px;font-weight:300}
/* 导航 */
nav{position:fixed;top:0;left:0;right:0;z-index:100;backdrop-filter:blur(14px);background:rgba(5,7,13,.72);border-bottom:1px solid var(--line)}
.nav-in{max-width:1180px;margin:0 auto;padding:0 26px;display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
.logo-badge{width:38px;height:38px;border-radius:10px;background:var(--grad);display:grid;place-items:center;font-family:var(--serif);font-weight:900;font-size:17px;color:#04121a;box-shadow:0 0 22px rgba(0,242,255,.45)}
.logo-name{font-family:var(--serif);font-weight:700;letter-spacing:2px;font-size:18px}
.logo-name em{font-style:normal;color:var(--cyan);font-size:12px;letter-spacing:1px;display:block;font-family:var(--sans);font-weight:400}
.nav-links{display:flex;gap:26px;list-style:none;align-items:center}
.nav-links a{color:var(--muted);text-decoration:none;font-size:14px;transition:.25s}
.nav-links a:hover{color:var(--cyan);text-shadow:0 0 12px rgba(0,242,255,.6)}
.nav-links a.act{color:var(--cyan);text-shadow:0 0 12px rgba(0,242,255,.6)}
.nav-links a.c-cta{color:#04121a;background:var(--grad);padding:9px 20px;border-radius:999px;font-weight:700;box-shadow:0 0 20px rgba(0,242,255,.35)}
.nav-links a.c-cta:hover{color:#04121a;transform:translateY(-1px)}
.nav-burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-burger span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
nav.scrolled{background:rgba(5,7,13,.92);box-shadow:0 10px 32px rgba(0,0,0,.45)}
/* 页头横幅 */
.page-hero{padding:158px 0 60px;text-align:center}
.crumbs{font-size:13px;color:var(--muted2);letter-spacing:1px;margin-bottom:22px}
.crumbs a{color:var(--muted);text-decoration:none;transition:.25s}
.crumbs a:hover{color:var(--cyan)}
.crumbs i{font-style:normal;margin:0 8px;color:var(--muted2)}
/* 卡片与按钮 */
.card{background:var(--panel);border:1px solid var(--line);border-radius:20px;backdrop-filter:blur(10px);transition:.35s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0;border-radius:20px;padding:1px;background:linear-gradient(140deg,rgba(0,242,255,.5),transparent 40%,transparent 60%,rgba(168,85,247,.5));-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;opacity:0;transition:.4s}
.card:hover{transform:translateY(-6px);border-color:rgba(0,242,255,.4)}
.card:hover::before{opacity:1}
.btn{display:inline-block;padding:13px 32px;border-radius:999px;text-decoration:none;font-weight:700;font-size:15px;letter-spacing:1px;transition:.3s;border:0;cursor:pointer;font-family:var(--sans)}
.btn-primary{background:var(--grad);color:#04121a;box-shadow:0 0 30px rgba(0,242,255,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 46px rgba(168,85,247,.55)}
.btn-ghost{border:1px solid rgba(0,242,255,.45);color:var(--cyan);background:rgba(0,242,255,.04)}
.btn-ghost:hover{background:rgba(0,242,255,.12);box-shadow:0 0 24px rgba(0,242,255,.25)}
.btn-gold{background:var(--gold-grad);color:#1a1004}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 0 32px rgba(255,209,102,.4)}
/* 数据卡 */
.hstat{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px 26px;min-width:150px;backdrop-filter:blur(8px)}
.hstat b{font-family:var(--serif);font-size:26px;font-weight:900;display:block;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hstat span{font-size:12.5px;color:var(--muted);letter-spacing:1px}
/* Footer */
footer{border-top:1px solid var(--line);padding:44px 0;background:rgba(4,6,12,.6)}
.footer-in{max-width:1180px;margin:0 auto;padding:0 26px;display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between}
footer p{font-size:12.5px;color:var(--muted2);letter-spacing:1px}
footer .f-slogan{font-family:var(--serif);color:var(--muted);font-size:14px;letter-spacing:3px}
footer .f-links{display:flex;gap:22px;flex-wrap:wrap;margin-top:10px}
footer .f-links a{color:var(--muted2);text-decoration:none;font-size:12.5px;transition:.25s}
footer .f-links a:hover{color:var(--cyan)}
/* 组件 */
.reveal{opacity:0;transform:translateY(36px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:translateY(0)}
.reveal-d1{transition-delay:.1s}.reveal-d2{transition-delay:.2s}.reveal-d3{transition-delay:.3s}
section{scroll-margin-top:74px}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:110;pointer-events:none}
.progress i{display:block;height:100%;background:var(--grad);transform-origin:0 50%;transform:scaleX(0);box-shadow:0 0 10px rgba(0,242,255,.6)}
.to-top{position:fixed;right:24px;bottom:28px;width:46px;height:46px;border-radius:50%;border:1px solid rgba(0,242,255,.4);background:rgba(10,15,28,.82);backdrop-filter:blur(8px);color:var(--cyan);font-size:17px;cursor:pointer;display:grid;place-items:center;opacity:0;pointer-events:none;transition:.35s;z-index:95;box-shadow:0 6px 24px rgba(0,0,0,.45)}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{transform:translateY(-3px);box-shadow:0 0 22px rgba(0,242,255,.4)}
.toast{position:fixed;left:50%;bottom:92px;transform:translate(-50%,16px);background:rgba(10,18,34,.94);border:1px solid rgba(0,242,255,.45);color:var(--cyan);padding:11px 24px;border-radius:999px;font-size:13.5px;letter-spacing:1px;opacity:0;pointer-events:none;transition:.35s;z-index:120;backdrop-filter:blur(8px);box-shadow:0 10px 34px rgba(0,0,0,.5);max-width:86vw}
.toast.show{opacity:1;transform:translate(-50%,0)}
/* 表单 */
.field{display:flex;flex-direction:column;gap:8px;text-align:left}
.field label{font-size:13px;color:var(--muted);letter-spacing:1px}
.field input,.field select,.field textarea{background:rgba(10,16,30,.8);border:1px solid var(--line);border-radius:12px;color:var(--ink);padding:12px 16px;font-size:14.5px;font-family:var(--sans);transition:.3s;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:rgba(0,242,255,.55);box-shadow:0 0 18px rgba(0,242,255,.12)}
.field input::placeholder,.field textarea::placeholder{color:var(--muted2)}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}
@media(max-width:640px){
  .nav-links{display:none}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:66px;left:0;right:0;background:rgba(5,7,13,.98);padding:24px 26px;gap:20px;border-bottom:1px solid var(--line)}
  .nav-burger{display:flex}
  section{padding:64px 0}
  section:first-of-type{padding-top:126px}
}