/* 言栖 · 屏幕端说明页（电视 / 车机 / 手表） */
:root{
  --bg:#05060a;--ink:#f3f5f9;--muted:#9aa3b2;--dim:#6b7385;
  --line:rgba(255,255,255,.075);--line-strong:rgba(255,255,255,.14);
  --rose:#ff6b9a;--violet:#8b5cf6;--sky:#3ec9ff;--acc:#43e08a;
  --panel:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.016));
  --radius:22px;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{
  background:
    radial-gradient(70% 50% at 15% 0%,rgba(139,92,246,.22),transparent 60%),
    radial-gradient(60% 45% at 100% 10%,rgba(62,201,255,.14),transparent 60%),
    var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",sans-serif;
  line-height:1.7;-webkit-text-size-adjust:100%;
}
a{color:inherit}
.wrap{max-width:820px;margin:0 auto;padding:28px 20px 56px}
.top{display:flex;align-items:center;gap:12px;margin-bottom:34px}
.top img{width:34px;height:34px;border-radius:10px}
.top b{font-size:16px;letter-spacing:-.01em}
.top em{font-style:normal;color:var(--dim);font-size:11px;letter-spacing:.14em;text-transform:uppercase;margin-left:2px}
.back{margin-left:auto;font-size:12.5px;color:var(--muted);text-decoration:none;border:1px solid var(--line-strong);
  padding:7px 13px;border-radius:999px}
.back:hover{border-color:rgba(255,255,255,.3);color:#fff}
.eyebrow{display:inline-block;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin-bottom:10px}
h1{margin:0 0 12px;font-size:clamp(26px,4vw,38px);line-height:1.2;letter-spacing:-.02em}
.grad{background:linear-gradient(110deg,#ffaac3,#c6a4ff 55%,#8bd8ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{margin:0 0 26px;color:var(--muted);font-size:15px;max-width:60ch}
.card{position:relative;padding:24px;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);
  box-shadow:0 28px 60px -46px rgba(0,0,0,.95);margin-bottom:18px}
.card h2{margin:0 0 14px;font-size:15px;letter-spacing:-.01em}
ol{margin:0;padding-left:0;list-style:none;counter-reset:s}
ol li{counter-increment:s;position:relative;padding-left:38px;margin-bottom:14px;color:var(--muted);font-size:14px}
ol li:last-child{margin-bottom:0}
ol li::before{content:counter(s);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:8px;
  display:grid;place-items:center;font-size:12px;font-weight:600;color:#0a1a12;
  background:linear-gradient(135deg,#7bf0b0,#43e08a)}
ol li b{color:var(--ink);font-weight:600}
ul.tips{margin:0;padding-left:18px;color:var(--muted);font-size:13.5px}
ul.tips li{margin-bottom:8px}
ul.tips li:last-child{margin-bottom:0}
.open{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:4px}
.btn{display:inline-flex;align-items:center;gap:8px;height:44px;padding:0 20px;border-radius:13px;
  font-size:14px;font-weight:600;text-decoration:none;border:1px solid transparent;
  background:linear-gradient(120deg,#ffaac3,#c6a4ff 70%,#8bd8ff);color:#150610;
  box-shadow:0 16px 34px -18px rgba(255,107,154,.6);transition:transform .2s}
.btn:active{transform:scale(.985)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line-strong);box-shadow:none}
.qr{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.qr img{width:132px;height:132px;border-radius:14px;background:#fff;padding:8px}
.qr small{display:block;color:var(--dim);font-size:12px;margin-top:6px}
.url{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--sky);
  background:rgba(62,201,255,.08);border:1px solid rgba(62,201,255,.18);border-radius:8px;padding:2px 8px}
.foot{color:var(--dim);font-size:12px;text-align:center;margin-top:28px}
@media (max-width:520px){
  .wrap{padding:22px 16px 44px}
  .card{padding:18px}
  .qr img{width:112px;height:112px}
  ol li{padding-left:34px}
}