/* 官网子页面（邀请/私房/隐私/条款/删号）共用样式。
   设计 token 与 web/.layout.html 保持一致：极简黑白，只有 CTA 是黑色实心。
   改这一处，五个子页面一起变。 */
:root {
  --ink: #111; --muted: #888; --light: #f6f6f6; --border: #e9e9e9;
  /* 与官网首页一致：CTA 用 App 主色（规则 25） */
  --brand: #18B7C3; --brand-dark: #168EAE;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--ink); background: #fff; line-height: 1.65; -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: var(--ink); }
/* 正文里的链接：中性下划线（浏览器默认在某些字体下会渲染成偏黄的红线） */
.page a, .note a { text-decoration-color: var(--muted); text-underline-offset: 2px; }

/* 顶部条 */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2.5rem; border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.brand span { font-weight: 700; letter-spacing: -.02em; font-size: 1rem; }
.topbar nav { display: flex; align-items: center; gap: 1.3rem; }
.topbar nav a { font-size: .85rem; color: var(--muted); text-decoration: none; }
.topbar nav a:hover { color: var(--ink); }
.topbar nav a.cta {
  background: var(--brand); color: #fff; padding: .45rem 1rem; border-radius: 8px;
  font-size: .82rem; font-weight: 500;
}
.topbar nav a.cta:hover { background: var(--brand-dark); }

/* 正文 */
.page { max-width: 780px; margin: 0 auto; padding: 3.5rem 1.5rem 5rem; }
.page.narrow { max-width: 560px; }
h1 { font-size: clamp(1.7rem, 4vw, 2.2rem); font-weight: 700; letter-spacing: -.025em; margin-bottom: .9rem; }
h2 { font-size: 1.02rem; font-weight: 600; margin: 2rem 0 .5rem; }
p, li { font-size: .92rem; color: #333; margin-bottom: .9rem; }
ul, ol { margin: 0 0 1rem 1.2rem; }
.muted { color: var(--muted); }
.note { background: var(--light); border-radius: 12px; padding: .9rem 1rem; font-size: .85rem; color: #555; }

/* 卡片（邀请 / 私房） */
.card {
  border: 1px solid var(--border); border-radius: 18px; padding: 2.2rem 2rem 2rem;
  text-align: center;
}
.card h1 { margin-bottom: .5rem; }
.sub { color: var(--muted); margin-bottom: 1.8rem; font-size: .92rem; }
.btn {
  display: flex; align-items: center; justify-content: center; gap: .5rem;
  width: 100%; padding: .85rem 1rem; border-radius: 10px;
  font-size: .92rem; font-weight: 500; text-decoration: none;
  border: 1px solid transparent; transition: opacity .2s, background .2s;
}
.btn-brand { background: var(--brand); color: #fff; }
.btn-brand:hover { background: var(--brand-dark); }
.btn-light { background: var(--light); color: var(--ink); border-color: var(--border); }
.btn-light:hover { background: #ececec; }
.badge-link { display: block; margin-top: .9rem; }
.badge-link img { height: 52px; margin: 0 auto; }
.hint { font-size: .8rem; color: var(--muted); margin-top: 1rem; }
.open-app { display: inline-block; margin-top: .7rem; font-size: .8rem; color: var(--muted); }

/* 邀请码 / 房号 */
.code-box {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  border: 1px dashed var(--border); background: #fafafa;
  border-radius: 12px; padding: .85rem 1rem; margin-bottom: 1rem; text-align: left;
}
.code-box small { display: block; font-size: .7rem; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.code-box b { font-size: 1.2rem; letter-spacing: .12em; font-variant-numeric: tabular-nums; }
.copy-btn {
  border: 1px solid var(--border); background: #fff; color: var(--ink);
  border-radius: 8px; padding: .45rem .9rem; font-size: .8rem; font-family: inherit; cursor: pointer;
}
.copy-btn:hover { border-color: #ccc; }
.copy-btn.copied { border-color: var(--ink); }
.reward { display: inline-block; background: var(--light); border-radius: 999px; padding: .35rem .9rem; font-size: .82rem; color: #444; margin-bottom: 1.2rem; }
.reward b { color: var(--ink); }
.features3 { display: flex; justify-content: center; gap: 1.4rem; flex-wrap: wrap; margin-top: 1.8rem; }
.features3 span { display: flex; align-items: center; gap: .35rem; font-size: .76rem; color: var(--muted); }
.features3 svg { width: 15px; height: 15px; stroke: #aaa; fill: none; stroke-width: 1.8; stroke-linecap: round; }

/* 表单（删号） */
.field { display: block; margin-bottom: 1rem; }
.field > span, .field > label { display: block; font-size: .8rem; color: var(--muted); margin-bottom: .35rem; }
.field .btn { margin-top: .4rem; }
.field input, .field textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 10px;
  padding: .7rem .8rem; font: inherit; font-size: .9rem; background: #fff; color: var(--ink);
}
.field input:focus, .field textarea:focus { outline: none; border-color: #bbb; }
#result { font-size: .85rem; color: var(--muted); margin-top: .8rem; min-height: 1.2em; }

footer {
  border-top: 1px solid var(--border); padding: 1.7rem 2.5rem;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
  font-size: .8rem; color: #bbb;
}
footer a { color: #bbb; text-decoration: none; }
footer a:hover { color: var(--ink); }
.footer-links { display: flex; gap: 1.3rem; flex-wrap: wrap; }

@media (max-width: 640px) {
  .topbar { padding: .8rem 1.1rem; }
  .brand span { display: none; }
  .page { padding: 2rem 1.1rem 3.5rem; }
  .card { padding: 1.5rem 1.2rem; }
  footer { padding: 1.4rem 1.1rem; flex-direction: column; align-items: flex-start; }
}