/* OnlyUs 落地页 —— 品牌色与 H5/App 同源（桃心渐变 #E77DD7→#C146EF，白底） */
:root {
  --brand-a: #E77DD7;
  --brand-b: #C146EF;
  --brand-grad: linear-gradient(135deg, #E77DD7, #C146EF);
  --ink: #172033;
  --ink-2: #475569;
  --ink-3: #64748B;
  --bg: #ffffff;
  --bg-soft: #F7F8FA;
  --line: #E8EAEF;
  --radius: 16px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container-pad { padding: 0 20px; }

/* ① 导航 */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 20px; letter-spacing: .2px; }
.brand-heart { width: 26px; height: 26px; }
.brand-heart.sm { width: 18px; height: 18px; }

/* 语言下拉（与 App 一致） */
.lang-wrap { position: relative; }
.lang-btn { display: flex; align-items: center; gap: 7px; padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink-2); font-size: 14px; cursor: pointer; }
.lang-btn:hover { border-color: var(--brand-b); color: var(--brand-b); }
.lang-btn .caret { transition: transform .18s; }
.lang-btn[aria-expanded="true"] .caret { transform: rotate(180deg); }
.lang-menu { position: absolute; right: 0; top: calc(100% + 8px); min-width: 160px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 12px 32px rgba(23,32,51,.12); list-style: none; padding: 6px; z-index: 60; }
.lang-menu li { padding: 10px 14px; border-radius: 8px; font-size: 14px; color: var(--ink-2); cursor: pointer; }
.lang-menu li:hover { background: var(--bg-soft); }
.lang-menu li.active { color: #fff; background: var(--brand-grad); }

/* ② Hero */
.hero { overflow: hidden; background: linear-gradient(180deg, #FDF4FB 0%, #fff 100%); }
.hero-inner { max-width: 1080px; margin: 0 auto; padding: 40px 20px 32px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
.hero-copy h1 { font-size: clamp(28px, 4.2vw, 42px); line-height: 1.25; font-weight: 800; }
.hero-copy h1 em { font-style: normal; background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { margin-top: 14px; color: var(--ink-2); font-size: clamp(15px, 1.6vw, 17px); max-width: 34em; }
.hero-tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 10px; margin-top: 20px; }
.hero-tags li { font-size: 13px; color: var(--ink-2); background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; }
.hero-cta { margin-top: 28px; display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.ver-line { display: inline-flex; align-items: center; gap: 4px; }
.ver-line { color: var(--ink-3); font-size: 13px; }
.ver-line #verNum { font-weight: 600; color: var(--ink-2); }
.hero-art img { border-radius: 22px; box-shadow: 0 24px 60px rgba(193,70,239,.18); }

/* 主按钮 */
.btn-primary { display: inline-flex; align-items: center; justify-content: center; gap: 10px; background: var(--brand-grad); color: #fff; font-weight: 700; font-size: 16px; border-radius: 999px; padding: 14px 30px; box-shadow: 0 12px 28px rgba(193,70,239,.35); transition: transform .15s, box-shadow .15s; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 16px 34px rgba(193,70,239,.42); }
.btn-primary:active { transform: translateY(0); }
.btn-xl { font-size: 18px; padding: 17px 40px; }

/* ④ 口号条 */
.slogan { background: var(--brand-grad); color: #fff; text-align: center; padding: 18px 20px; font-size: 15px; font-weight: 600; letter-spacing: .3px; }

/* ⑤ 功能卡 */
.features { max-width: 1080px; margin: 0 auto; padding: 64px 20px; }
.features h2 { text-align: center; font-size: clamp(22px, 3vw, 30px); font-weight: 800; margin-bottom: 34px; }
.feat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feat-card { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 16px; text-align: center; transition: box-shadow .18s, transform .18s; }
.feat-card:hover { box-shadow: 0 14px 34px rgba(23,32,51,.08); transform: translateY(-3px); }
.feat-ic { font-size: 30px; }
.feat-card h3 { margin-top: 12px; font-size: 16px; font-weight: 700; }
.feat-card p { margin-top: 8px; font-size: 13px; color: var(--ink-3); }

/* ⑥ 下载专区 */
.download { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dl-inner { max-width: 1080px; margin: 0 auto; padding: 64px 20px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.dl-copy h2 { font-size: clamp(22px, 3vw, 30px); font-weight: 800; }
.dl-copy > p { margin-top: 12px; color: var(--ink-2); max-width: 30em; }
.dl-copy .btn-xl { margin-top: 26px; }
.dl-qr { margin-top: 22px; display: flex; align-items: center; gap: 14px; }
.dl-qr img { border: 1px solid var(--line); border-radius: 10px; padding: 6px; background: #fff; }
.dl-qr p { font-size: 13px; color: var(--ink-3); max-width: 12em; }
.changelog { margin-top: 26px; border-top: 1px dashed var(--line); padding-top: 16px; }
.changelog h4 { font-size: 14px; color: var(--ink-2); margin-bottom: 8px; }
.changelog ul { list-style: none; }
.changelog li { font-size: 13px; color: var(--ink-3); padding: 3px 0; }
.changelog li b { color: var(--ink-2); font-weight: 600; }

/* 手机视觉（纯 CSS mockup） */
.dl-art { display: flex; justify-content: center; }
.phone { width: 250px; height: 500px; border-radius: 38px; background: #10151f; padding: 10px; box-shadow: 0 30px 70px rgba(23,32,51,.35); position: relative; }
.phone-notch { position: absolute; top: 18px; left: 50%; transform: translateX(-50%); width: 88px; height: 22px; background: #10151f; border-radius: 999px; z-index: 2; }
.phone-screen { width: 100%; height: 100%; border-radius: 30px; overflow: hidden; background: var(--brand-grad); display: flex; align-items: center; justify-content: center; }
.ph-app { text-align: center; color: #fff; padding: 24px; width: 100%; }
.ph-heart { width: 56px; height: 56px; margin: 0 auto 14px; filter: drop-shadow(0 4px 12px rgba(0,0,0,.18)); }
.ph-name { font-size: 22px; font-weight: 800; letter-spacing: .5px; }
.ph-bar { height: 10px; border-radius: 999px; background: rgba(255,255,255,.45); margin: 14px auto 0; }
.ph-btn { margin-top: 26px; display: inline-block; background: #fff; color: var(--brand-b); font-weight: 700; font-size: 14px; border-radius: 999px; padding: 10px 28px; }

/* ⑧ 页脚 */
.footer { background: #fff; }
.footer-inner { max-width: 1080px; margin: 0 auto; padding: 36px 20px; display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; border-top: 1px solid var(--line); }
.footer-brand { display: flex; align-items: center; gap: 7px; font-weight: 700; }
.footer-links { display: flex; gap: 22px; font-size: 14px; color: var(--ink-2); }
.footer-links a:hover { color: var(--brand-b); }
.copyright { width: 100%; text-align: center; color: var(--ink-3); font-size: 12.5px; margin-top: 6px; }

/* 响应式 */
@media (max-width: 900px) {
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; padding-top: 20px; }
  .hero-art { order: -1; max-width: 440px; margin: 0 auto; }
  .dl-inner { grid-template-columns: 1fr; gap: 36px; }
  .dl-art { order: -1; }
  .phone { width: 220px; height: 440px; }
}
@media (max-width: 520px) {
  .feat-grid { grid-template-columns: 1fr 1fr; }
  .feat-card { padding: 18px 10px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}