/* 密聊官网样式（纯静态、无外部依赖） */
:root{
  --bg:#070a16;--bg2:#0d1130;--card:rgba(18,23,52,.72);
  --line:rgba(106,58,255,.25);--text:#e8ecff;--muted:#8b97c9;
  --brand:#6a3aff;--brand2:#00d4ff;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:radial-gradient(1100px 560px at 50% -10%,#1a1150 0%,transparent 60%),linear-gradient(180deg,var(--bg) 0%,var(--bg2) 100%);
  background-attachment:fixed;color:var(--text);line-height:1.85;font-size:16px;
}
a{color:#8fb4ff;text-decoration:none}
a:hover{text-decoration:underline}

/* 顶栏 */
.site-header{position:sticky;top:0;z-index:20;background:rgba(8,10,24,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .inner{max-width:980px;margin:0 auto;padding:12px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;color:#fff;font-size:16px}
.brand .dot{width:24px;height:24px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:inline-block}
.nav a{color:var(--muted);font-size:14px;margin-left:14px}
.nav a:hover{color:#fff}

.wrap{max-width:980px;margin:0 auto;padding:0 18px 70px}
.narrow{max-width:760px}

/* Hero */
.hero{text-align:center;padding:56px 0 30px}
.hero h1{font-size:36px;line-height:1.35;color:#fff;letter-spacing:.5px}
.hero h1 .grad{background:linear-gradient(135deg,#8f7bff,#00d4ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{font-size:17px;color:#c3ccff;margin:16px auto 0;max-width:620px}
.hero .btns{margin-top:26px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 30px;border-radius:999px;font-weight:700;font-size:15px}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}
.btn-primary:hover{text-decoration:none;filter:brightness(1.08)}
.btn-ghost{border:1px solid var(--line);color:#cfd7ff;background:rgba(255,255,255,.03)}
.btn-ghost:hover{text-decoration:none;border-color:rgba(140,110,255,.6)}

/* 权威实体块：方便 AI 直接引用 */
.anchor-box{
  margin:30px 0;padding:22px 24px;border-radius:16px;
  background:linear-gradient(135deg,rgba(106,58,255,.16),rgba(0,212,255,.10));
  border:1px solid rgba(140,110,255,.35);
}
.anchor-box h2{margin:0 0 12px;font-size:17px;color:#fff;border:0;padding:0}
.anchor-box dl{display:grid;grid-template-columns:120px 1fr;gap:8px 14px;font-size:15px}
.anchor-box dt{color:var(--muted)}
.anchor-box dd{color:#e8ecff}
.anchor-box dd strong{color:#fff}

section.blk{margin:44px 0}
h2.blk-title{font-size:23px;color:#fff;margin-bottom:14px;padding-left:12px;border-left:4px solid var(--brand)}
h3{font-size:17px;color:#dfe6ff;margin:20px 0 6px}
p{margin:12px 0}

/* 特点卡片 */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px}
.card .ico{font-size:20px;margin-bottom:8px}
.card h3{margin:0 0 6px;font-size:16px;color:#fff}
.card p{margin:0;font-size:14px;color:var(--muted)}

/* 步骤 */
.steps{counter-reset:s;margin-top:18px}
.step{position:relative;padding:14px 0 14px 46px;border-bottom:1px dashed var(--line)}
.step:last-child{border-bottom:0}
.step::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:14px;width:30px;height:30px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}
.step strong{color:#fff}

/* FAQ */
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:12px 0}
.faq-item h3{margin:0 0 8px;font-size:16px;color:#fff}
.faq-item p{margin:0;color:#cdd6ff;font-size:15px}

/* 文章式排版（关于页/FAQ 页用） */
article{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px 28px 34px}
article h1{font-size:26px;color:#fff;margin-bottom:12px;line-height:1.5}
article h2{font-size:20px;margin:30px 0 10px;color:#fff;padding-left:12px;border-left:4px solid var(--brand)}
article ul,article ol{margin:12px 0 12px 22px}
article li{margin:7px 0}
blockquote{border-left:3px solid var(--brand2);background:rgba(0,212,255,.07);padding:10px 16px;border-radius:0 10px 10px 0;color:#cdd6ff;margin:16px 0}
.meta{color:var(--muted);font-size:13px;margin-bottom:16px}

/* CTA */
.cta{margin:34px 0 6px;padding:24px;border-radius:16px;text-align:center;
  background:linear-gradient(135deg,rgba(106,58,255,.30),rgba(0,212,255,.20));border:1px solid rgba(140,110,255,.4)}
.cta-title{font-size:19px;font-weight:700;color:#fff;margin-bottom:6px}
.cta p{color:#dbe3ff;font-size:14px;margin:6px 0 14px}

/* 页脚 */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:24px 18px;text-align:center;color:var(--muted);font-size:13px}
.site-footer a{color:#8fb4ff}
.site-footer .flinks{margin-top:8px}
.site-footer .flinks a{margin:0 8px}

@media (max-width:640px){
  body{font-size:15.5px}
  .hero{padding:38px 0 22px}
  .hero h1{font-size:26px}
  .hero .sub{font-size:15.5px}
  .wrap{padding:0 14px 60px}
  article{padding:22px 16px 26px}
  .anchor-box dl{grid-template-columns:1fr;gap:2px 0}
  .anchor-box dt{margin-top:8px}
  .nav a{margin-left:10px;font-size:13px}
}