/* baipiao 官网样式（沿用原 download-site 深色主题，扩展支持 5 个页面） */
:root {
  --bg: #0b0e14;
  --card: #131822;
  --line: #222b3a;
  --txt: #e8edf4;
  --sub: #8b95a7;
  --accent: #22d3ee;
  --green: #34d399;
  --amber: #fbbf24;
  --violet: #a78bfa;
  --max: 720px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--txt);
  font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  min-height: 100vh;
  padding: 20px;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ 顶部导航 ============ */
.nav {
  max-width: var(--max);
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
}
.nav-brand { font-weight: 800; font-size: 16px; letter-spacing: 1px; }
.nav-brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 18px; flex-wrap: wrap; }
.nav-links a {
  color: var(--sub);
  font-size: 14px;
  padding: 4px 10px;
  border-radius: 8px;
}
.nav-links a:hover { background: rgba(34,43,58,.6); color: var(--txt); text-decoration: none; }
.nav-links a.active { color: var(--accent); background: rgba(34,211,238,.1); }

/* ============ 通用容器 ============ */
.wrap { max-width: var(--max); width: 100%; margin: 0 auto; }

.hero { text-align: center; padding: 30px 16px 18px; }
.site-title { font-size: 24px; font-weight: 800; letter-spacing: 1px; }
.site-sub { color: var(--sub); font-size: 13px; margin-top: 6px; }

/* ============ App 卡片（主页） ============ */
.app {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px 20px 18px;
  margin-bottom: 18px;
  background: linear-gradient(180deg, rgba(19,24,34,.95), rgba(19,24,34,.75));
}
.app-head { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 64px; height: 64px;
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; font-weight: 800;
  color: #0b0e14;
  flex-shrink: 0;
  box-shadow: 0 10px 26px rgba(34,211,238,.22);
}
.logo.music { background: linear-gradient(135deg,#22d3ee,#34d399); }
.logo.learn { background: linear-gradient(135deg,#a78bfa,#f472b6); }
.app-name { font-size: 20px; font-weight: 800; }
.app-desc { color: var(--sub); font-size: 13px; margin-top: 4px; line-height: 1.5; }
.badges { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.badge {
  font-size: 12px;
  padding: 3px 11px;
  border-radius: 20px;
  background: rgba(34,43,58,.6);
  border: 1px solid var(--line);
  color: var(--sub);
}
.badge b { color: var(--accent); }
.badge.learn b { color: var(--violet); }

.features {
  background: rgba(34,43,58,.25);
  border: 1px solid rgba(34,43,58,.7);
  border-radius: 12px;
  padding: 12px 16px;
  margin-top: 14px;
}
.feat { display: flex; align-items: center; gap: 10px; padding: 6px 0; }
.feat:not(:last-child) { border-bottom: 1px solid rgba(34,43,58,.6); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); flex-shrink: 0; }
.feat span { font-size: 13px; }
.feat small { color: var(--sub); font-size: 11px; margin-left: auto; white-space: nowrap; }

.dl { margin-top: 16px; text-align: center; }
.dlbtn {
  display: block; width: 100%;
  padding: 14px;
  border: none; border-radius: 13px;
  background: linear-gradient(135deg,#22d3ee,#34d399);
  color: #0b0e14;
  font-size: 16px; font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 2px;
  box-shadow: 0 10px 26px rgba(52,211,153,.28);
}
.dlbtn.learn {
  background: linear-gradient(135deg,#a78bfa,#f472b6);
  box-shadow: 0 10px 26px rgba(167,139,250,.28);
}
.dlbtn:active { transform: translateY(1px); }
.meta { color: var(--sub); font-size: 12px; margin-top: 10px; }

/* ============ 内容页（隐私/协议/更新日志/关于） ============ */
.doc {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 28px;
  background: var(--card);
}
.doc h1 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.doc .doc-meta { color: var(--sub); font-size: 12px; margin-bottom: 22px; }
.doc h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  margin-top: 22px;
  margin-bottom: 10px;
}
.doc h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--txt);
  margin-top: 16px;
  margin-bottom: 8px;
}
.doc p { color: var(--txt); font-size: 14px; margin-bottom: 10px; }
.doc ul, .doc ol { padding-left: 22px; margin-bottom: 10px; }
.doc li { color: var(--txt); font-size: 14px; margin-bottom: 4px; }
.doc code {
  background: rgba(34,43,58,.6);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--amber);
}
.doc strong { color: var(--amber); font-weight: 700; }
.doc hr {
  border: none;
  border-top: 1px dashed var(--line);
  margin: 22px 0;
}

/* ============ 更新日志列表 ============ */
.versions { display: flex; flex-direction: column; gap: 14px; }
.version {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  background: rgba(19,24,34,.6);
}
.ver-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.ver-tag {
  font-family: 'Courier New', monospace;
  font-size: 14px;
  font-weight: 800;
  color: var(--accent);
}
.ver-date { color: var(--sub); font-size: 12px; }
.ver-type {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(167,139,250,.2);
  color: var(--violet);
  border: 1px solid rgba(167,139,250,.4);
}
.ver-type.major { background: rgba(251,191,36,.2); color: var(--amber); border-color: rgba(251,191,36,.4); }
.ver-type.minor { background: rgba(52,211,153,.2); color: var(--green); border-color: rgba(52,211,153,.4); }
.ver-type.patch { background: rgba(139,149,167,.2); color: var(--sub); border-color: rgba(139,149,167,.4); }
.ver-body { font-size: 13px; color: var(--txt); }
.ver-body ul { padding-left: 20px; }
.ver-body li { font-size: 13px; margin-bottom: 3px; }

/* ============ 通用组件 ============ */
.tips {
  margin-top: 14px;
  background: rgba(34,43,58,.35);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 18px;
}
.tips h3 { font-size: 13px; color: var(--amber); margin-bottom: 8px; }
.tips ol { padding-left: 18px; color: var(--sub); font-size: 12px; line-height: 1.9; }

.foot {
  text-align: center;
  color: #5a6474;
  font-size: 11px;
  padding: 24px 0 8px;
  margin-top: 30px;
}

/* 移动端 */
@media (max-width: 540px) {
  .nav { flex-direction: column; gap: 10px; padding: 12px 14px; }
  .nav-links { gap: 10px; justify-content: center; }
  .doc { padding: 18px 16px; }
  .ver-head { gap: 6px; }
}