/* Auri 落地页 —— 暗底 + 金(沿用 worker 管理面板 #c9a227 一族),无框架无 webfont */
:root {
  --bg: #14171c;
  --panel: #1a1e25;
  --line: #2a2f38;
  --text: #e8e6e1;
  --muted: #9aa0a8;
  --gold: #c9a227;
  --gold-soft: rgba(201, 162, 39, 0.14);
  --serif: Georgia, "Times New Roman", "Songti SC", "SimSun", "Noto Serif CJK JP", serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans", "Noto Sans CJK SC", "Noto Sans CJK JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* 顶栏 */
.nav { display: flex; align-items: center; justify-content: space-between;
  padding-top: 22px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text);
  text-decoration: none; font-size: .95rem; letter-spacing: .06em; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.brand-name { white-space: nowrap; }
.langs a { color: var(--muted); text-decoration: none; font-size: .9rem;
  padding: 6px 10px; }
.langs a.on { color: var(--gold); }
.langs a:hover { color: var(--text); }

/* 首屏 */
.hero { text-align: center; padding: 76px 0 48px; }
.eyebrow { color: var(--muted); letter-spacing: .18em; font-size: .82rem; margin: 0 0 18px; }
.hero h1 { font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.1rem, 6vw, 3.2rem); letter-spacing: .04em;
  margin: 0 0 14px; line-height: 1.25; }
.pitch { color: var(--gold); font-size: 1.2rem; margin: 0 0 10px; }
.sub { color: var(--muted); margin: 0; }
.cta { margin: 34px 0 0; color: var(--muted); font-size: .9rem;
  letter-spacing: .22em; }

/* 单腿演示(#108 方案 A:公版书选段,App 同引擎实录,不设比较) */
.demo { padding: 40px 0 24px; }
.demo h2 { font-family: var(--serif); font-weight: 600; font-size: 1.7rem;
  text-align: center; margin: 0 0 8px; }
.lead { text-align: center; color: var(--muted); margin: 0 0 26px; }
.demo-card { background: var(--panel); border: 1px solid var(--line);
  border-radius: 14px; padding: 28px 28px 22px; max-width: 720px;
  margin: 0 auto; color: var(--gold); }
.demo-text { font-family: var(--serif); font-size: 1.05rem; line-height: 2;
  margin: 0; }
/* 引号装饰自有化:blockquote 的 UA 装饰跨浏览器不可控(#108 实测 Chromium
   会自动加 open-quote),改用 p + 自绘块级引号,三语浏览器一致 */
.demo-text::before { content: '“'; display: block; font-size: 2rem;
  line-height: 1; height: .55em; color: var(--gold); opacity: .55; }
.demo-source { color: var(--muted); font-size: .85rem; margin: 14px 0 0; }
.wave { display: block; width: 100%; height: 44px; margin: 14px 0; opacity: .55; }
.demo-card audio { width: 100%; }
.note { color: var(--muted); font-size: .85rem; text-align: center;
  margin: 20px 0 0; }

/* 三步 */
.how { padding: 56px 0 16px; }
.how h2, .features h2, .faq h2 { font-family: var(--serif); font-weight: 600;
  font-size: 1.7rem; text-align: center; margin: 0 0 30px; }
.steps { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.step .num { font-family: var(--serif); color: var(--gold); font-size: 1.15rem;
  letter-spacing: .1em; margin: 0; }
.step .t { font-weight: 600; margin: 8px 0 6px; }
.step .d { color: var(--muted); font-size: .93rem; margin: 0; }

/* 特性格 */
.features { padding: 40px 0 16px; }
.grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.item { background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 18px 18px 14px; }
.item .t { font-weight: 600; margin: 0 0 6px; color: var(--gold); font-size: .98rem; }
.item .d { color: var(--muted); font-size: .9rem; margin: 0; }

/* FAQ */
.faq { padding: 40px 0 24px; }
.faq details { max-width: 720px; margin: 0 auto; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; padding: 16px 0; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+"; color: var(--gold); margin-right: 12px;
  font-family: var(--serif); }
.faq details[open] summary::before { content: "−"; }
.faq details p { color: var(--muted); margin: 0; padding: 0 0 18px; font-size: .95rem; }

/* 页脚 */
footer { text-align: center; padding: 56px 0 64px; }
.tagline { font-family: var(--serif); font-style: italic; color: var(--gold);
  letter-spacing: .2em; font-size: .95rem; margin: 0 0 10px; }
.copy { color: var(--muted); font-size: .82rem; margin: 0; }

/* 窄屏 */
@media (max-width: 720px) {
  /* 头部仅留图标(品牌全名下方 hero 眉标即有;三语名与语言切换挤一行必折行) */
  .brand-name { display: none; }
  .steps { grid-template-columns: 1fr; gap: 18px; }
  .grid { grid-template-columns: 1fr; }
  .hero { padding-top: 56px; }
}
@media (max-width: 980px) and (min-width: 721px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

/* ===== #101 下载区 ===== */
.download { padding: 48px 0 24px; }
.download h2 { font-family: var(--serif); font-weight: 600; font-size: 1.7rem;
  text-align: center; margin: 0 0 8px; }
.dl-card { background: var(--panel); border: 1px solid var(--line);
  border-radius: 14px; padding: 28px 22px; max-width: 560px; margin: 0 auto;
  text-align: center; }
.dl-btn { display: inline-block; background: var(--gold); color: var(--bg);
  font-weight: 700; text-decoration: none; border-radius: 10px;
  padding: 14px 36px; font-size: 1.05rem; letter-spacing: .02em; }
.dl-btn:hover { filter: brightness(1.1); }
.dl-meta { color: var(--muted); font-size: .9rem; margin: 14px 0 0; }
.dl-guide { max-width: 640px; margin: 24px auto 0; text-align: left; }
.dl-guide-title { font-weight: 600; margin: 0 0 10px; }
.dl-steps { margin: 0; padding-left: 20px; color: var(--muted); font-size: .93rem; }
.dl-steps li { margin: 0 0 10px; }

/* ===== #103 批次邀请码 ===== */
.codes { padding: 40px 0 16px; }
.codes h2 { font-family: var(--serif); font-weight: 600; font-size: 1.7rem;
  text-align: center; margin: 0 0 30px; }
.codes .lead { text-align: center; color: var(--muted); margin: -14px 0 26px; }
.channels { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.channel { background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 18px 18px 14px; }
.channel .ch-name { font-weight: 600; margin: 0 0 10px; color: var(--gold);
  font-size: .98rem; word-break: break-all; }
.codes-list { display: flex; flex-wrap: wrap; gap: 10px; }
.code { font: 600 .95rem/1 ui-monospace, SFMono-Regular, Menlo, Consolas,
  monospace; letter-spacing: .04em; color: var(--text);
  background: #10131a; border: 1px solid var(--line); border-radius: 8px;
  padding: 12px 14px; cursor: pointer; min-height: 44px; /* 移动端触达 */
  -webkit-user-select: all; user-select: all; /* 老浏览器回退:点按即全选 */ }
.code:hover { border-color: var(--gold); color: var(--gold); }
.code.copied { border-color: var(--gold); color: var(--gold);
  background: var(--gold-soft); }
.codes .ex-guide { text-align: center; color: var(--muted); margin: 0 0 8px; }
.codes .ex-link { text-align: center; margin: 0; }
.codes .ex-link a { color: var(--gold); text-decoration: none;
  font-weight: 600; }
.codes .ex-link a:hover { text-decoration: underline; }
@media (max-width: 720px) {
  .channels { grid-template-columns: 1fr; }
  .code { width: 100%; } /* 窄屏码块整行,便于点按与长按选中 */
}