:root{
  --bg:#ffffff;
  --bg-2:#f7f5f3;
  --surface:rgba(200,30,30,.03);
  --surface-2:rgba(200,30,30,.06);
  --border:rgba(0,0,0,.08);
  --border-strong:rgba(0,0,0,.14);
  --text:#1a1a1a;
  --text-dim:#5a5a5a;
  --text-faint:#999;
  --accent:#D93030;
  --accent-2:#B02020;
  --accent-soft:rgba(217,48,48,.10);
  --gold:#C08020;
  --serif:"Noto Serif SC","Songti SC","STSong",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --maxw:1180px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}

.bg-aura{
  position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(60% 50% at 75% 12%, rgba(217,48,48,.07), transparent 60%),
    radial-gradient(55% 45% at 12% 85%, rgba(192,128,32,.05), transparent 60%),
    linear-gradient(180deg,#ffffff 0%,#faf8f6 50%,#ffffff 100%);
}
.bg-grid{
  position:fixed;inset:0;z-index:-1;opacity:.35;
  background-image:
    linear-gradient(rgba(200,30,30,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(200,30,30,.025) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000 0%,transparent 75%);
          mask-image:radial-gradient(circle at 50% 30%,#000 0%,transparent 75%);
}

.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(160%) blur(14px);
  background:rgba(255,255,255,.82);
  border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s;
}
.nav.scrolled{border-bottom-color:var(--border);background:rgba(255,255,255,.92)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;justify-content:flex-start;
  padding:18px 28px;
}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{
  width:38px;height:38px;border-radius:11px;
  display:grid;place-items:center;
  font-family:var(--serif);font-weight:700;font-size:14px;letter-spacing:.5px;color:#fff;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 6px 18px rgba(217,48,48,.30);
}
.brand-mark.small{width:30px;height:30px;font-size:11px;border-radius:9px}
.brand-name{font-family:var(--serif);font-size:19px;font-weight:500;letter-spacing:1px}

.btn{
  display:inline-block;padding:15px 38px;border-radius:12px;
  font-size:16px;font-weight:500;letter-spacing:.5px;
  transition:transform .2s,box-shadow .2s,background .2s;cursor:pointer;
}
.btn-primary{
  color:#fff;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 10px 30px rgba(217,48,48,.25);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(217,48,48,.35)}
.btn-ghost{
  color:var(--text);background:rgba(0,0,0,.04);border:1px solid var(--border-strong);
}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--accent);color:var(--accent)}

.hero{padding:70px 28px 90px}
.hero-inner{
  max-width:var(--maxw);margin:0 auto;
  display:grid;grid-template-columns:1.05fr .95fr;gap:70px;align-items:center;
}
.eyebrow{
  display:inline-block;font-size:13px;letter-spacing:3px;text-transform:uppercase;
  color:var(--accent);margin-bottom:22px;font-weight:500;
}
.hero-title{
  font-family:var(--serif);font-weight:300;
  font-size:clamp(44px,6vw,76px);line-height:1.12;letter-spacing:2px;
  margin-bottom:26px;
}
.hero-sub{font-size:18px;color:var(--text-dim);margin-bottom:38px;line-height:1.9}
.hero-actions{display:flex;gap:16px;margin-bottom:48px;flex-wrap:wrap}
.hero-stats{list-style:none;display:flex;gap:46px}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats b{font-family:var(--serif);font-size:30px;font-weight:500;color:var(--text)}
.hero-stats span{font-size:13px;color:var(--text-faint);margin-top:4px}

.hero-demo{display:flex;justify-content:center}
.demo-window{
  width:100%;max-width:460px;
  background:linear-gradient(180deg,#fff,#faf8f6);
  border:1px solid var(--border-strong);border-radius:18px;
  box-shadow:0 20px 60px rgba(0,0,0,.10),0 0 0 1px rgba(217,48,48,.04) inset;
  overflow:hidden;
}
.demo-titlebar{
  display:flex;align-items:center;gap:8px;
  padding:14px 18px;border-bottom:1px solid var(--border);
  background:rgba(0,0,0,.015);
}
.dot{width:11px;height:11px;border-radius:50%}
.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840}
.demo-title{margin-left:10px;font-size:13px;color:var(--text-faint)}
.demo-screen{padding:26px 24px 18px;min-height:200px;font-size:17px;line-height:2}
.doc-line{font-family:var(--serif);color:var(--text);min-height:34px;letter-spacing:1px}
.compose-bar{
  margin-top:10px;display:flex;align-items:center;
  border-bottom:2px solid var(--accent);padding-bottom:4px;min-height:30px;
}
.compose-pinyin{color:var(--accent);font-size:16px;letter-spacing:1px}
.compose-caret{
  width:2px;height:20px;background:var(--accent);margin-left:1px;
  animation:blink 1s steps(2) infinite;
}
@keyframes blink{50%{opacity:0}}
.candidate-strip{
  display:flex;gap:14px;align-items:baseline;margin-top:14px;flex-wrap:wrap;min-height:26px;
}
.candidate-strip .cand-hint{font-size:12px;color:var(--text-faint)}
.candidate-strip .cand{
  font-family:var(--serif);font-size:17px;color:var(--text);
  opacity:0;transform:translateY(6px);animation:pop .3s forwards;
}
.candidate-strip .cand .num{font-size:11px;color:var(--text-faint);margin-right:3px}
@keyframes pop{to{opacity:1;transform:translateY(0)}}
.demo-foot{
  display:flex;align-items:center;gap:10px;
  padding:14px 24px;border-top:1px solid var(--border);
  background:rgba(0,0,0,.015);font-size:13px;color:var(--text-faint);
}
.demo-foot .kbd{
  background:rgba(0,0,0,.05);border:1px solid var(--border);
  border-radius:6px;padding:3px 9px;color:var(--text-dim);font-family:monospace;
}
.demo-foot .arrow{color:var(--accent)}
.demo-foot .result{color:var(--accent);font-family:var(--serif);font-size:15px}

.section{max-width:var(--maxw);margin:0 auto;padding:90px 28px}
.section-head{text-align:center;max-width:640px;margin:0 auto 60px}
.section-head h2{
  font-family:var(--serif);font-weight:400;font-size:clamp(30px,4vw,44px);
  letter-spacing:2px;margin:14px 0 16px;
}
.section-head p{color:var(--text-dim);font-size:17px}

.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card{
  background:var(--surface);border:1px solid var(--border);border-radius:18px;
  padding:34px 30px;transition:transform .25s,border-color .25s,background .25s;
}
.feature-card:hover{transform:translateY(-6px);border-color:rgba(217,48,48,.35);background:var(--surface-2)}
.feature-icon{
  width:52px;height:52px;border-radius:14px;margin-bottom:20px;
  display:grid;place-items:center;font-family:var(--serif);font-size:24px;
  color:var(--accent);background:var(--accent-soft);border:1px solid rgba(217,48,48,.18);
}
.feature-card h3{font-family:var(--serif);font-weight:500;font-size:21px;margin-bottom:12px;letter-spacing:1px}
.feature-card p{color:var(--text-dim);font-size:15px;line-height:1.85}

.about{text-align:center}
.about-inner{max-width:720px;margin:0 auto}
.about h2{font-family:var(--serif);font-weight:400;font-size:36px;letter-spacing:2px;margin-bottom:24px}
.about p{color:var(--text-dim);font-size:17px;line-height:2}
.about-sign{margin-top:24px;color:var(--gold);font-family:var(--serif);letter-spacing:1px}

/* 页脚 */
.footer{border-top:1px solid var(--border);margin-top:40px;padding:36px 28px 40px;background:var(--bg-2)}
.footer-inner{
  max-width:var(--maxw);margin:0 auto;
  display:flex;flex-direction:column;align-items:center;gap:20px;
  color:var(--text-faint);font-size:13px;
}
.footer-top{
  display:flex;align-items:center;gap:12px;
  color:var(--text-dim);font-size:14px;
}
.footer-record{
  display:flex;align-items:center;gap:22px;flex-wrap:wrap;justify-content:center;
}
.footer-record a{color:var(--text-faint);transition:color .2s}
.footer-record a:hover{color:var(--text)}
.record-police{display:inline-flex;align-items:center;gap:6px}
.record-police img{width:18px;height:18px;display:inline-block}

.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:980px){
  .hero-inner{grid-template-columns:1fr;gap:50px}
  .hero-demo{order:-1}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:620px){
  .hero-stats{gap:28px}
  .feature-grid{grid-template-columns:1fr}
  .hero{padding:40px 20px 60px}
  .section{padding:64px 20px}
  .footer-record{gap:14px}
}