:root {
  --brand1: #4a7dff;
  --brand2: #7c4dff;
  --ink: #14161c;
  --ink-soft: #5b6270;
  --line: #e6e8ee;
  --bg: #ffffff;
  --bg-soft: #f5f6fa;
  --dark: #0e1017;
  --dark-soft: #171a24;
  --radius: 18px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: clip; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand1); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: .9em;
  overflow-wrap: anywhere;
}

/* 顶部导航 */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(14, 16, 23, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, .07);
}
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  height: 62px; display: flex; align-items: center; gap: 10px;
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 18px; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav nav { margin-left: auto; display: flex; gap: 22px; flex-wrap: wrap; }
.nav nav a { color: rgba(255, 255, 255, .72); font-size: 14.5px; }
.nav nav a:hover { color: #fff; text-decoration: none; }
.nav nav a.on { color: #fff; }

/* 移动端菜单按钮（宽屏隐藏） */
.nav-toggle {
  display: none;
  margin-left: auto;
  width: 42px; height: 42px; padding: 0;
  border: 1px solid rgba(255, 255, 255, .18); border-radius: 12px;
  background: rgba(255, 255, 255, .06); color: #fff;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  cursor: pointer;
}
.nav-toggle span { display: block; width: 18px; height: 2px; border-radius: 2px; background: #fff; }

/* 侧边抽屉导航（仅窄屏显示） */
.drawer-scrim {
  position: fixed; inset: 0; z-index: 40;
  background: rgba(6, 8, 14, .55);
  opacity: 0; visibility: hidden;
  transition: opacity .25s ease, visibility .25s ease;
}
body.nav-open .drawer-scrim { opacity: 1; visibility: visible; }
.drawer {
  position: fixed; top: 0; right: 0; z-index: 50;
  width: min(84vw, 320px); height: 100%;
  display: flex; flex-direction: column;
  padding: 16px 16px calc(20px + env(safe-area-inset-bottom));
  background: var(--dark); color: #fff;
  border-left: 1px solid rgba(255, 255, 255, .08);
  box-shadow: -24px 0 60px rgba(0, 0, 0, .38);
  transform: translateX(103%); visibility: hidden;
  transition: transform .3s cubic-bezier(.22, .72, .28, 1), visibility .3s ease;
  overflow-y: auto;
}
body.nav-open .drawer { transform: translateX(0); visibility: visible; }
body.nav-open { overflow: hidden; }
.drawer-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding-bottom: 10px; border-bottom: 1px solid rgba(255, 255, 255, .09);
}
.drawer-title { font-size: 15px; font-weight: 700; letter-spacing: 1px; color: rgba(255, 255, 255, .62); }
.drawer-close {
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, .16); background: rgba(255, 255, 255, .06);
  color: #fff; font-size: 18px; line-height: 1; cursor: pointer;
}
.drawer nav { display: flex; flex-direction: column; gap: 2px; margin: 12px 0 0; }
.drawer nav a {
  display: flex; align-items: center; min-height: 46px; padding: 0 14px;
  border-radius: 12px; color: rgba(255, 255, 255, .78); font-size: 15.5px;
}
.drawer nav a:hover, .drawer nav a.on { background: rgba(255, 255, 255, .1); color: #fff; text-decoration: none; }
.drawer-cta { margin-top: 16px; }
.drawer-cta .btn { width: 100%; justify-content: center; }
.drawer-foot { margin-top: auto; padding-top: 18px; font-size: 12.5px; line-height: 1.7; color: rgba(255, 255, 255, .42); }

/* 双端自适应高亮 */
.dl-card.is-you, .block.is-you { border-color: rgba(74, 125, 255, .5); box-shadow: 0 0 0 4px rgba(74, 125, 255, .1); }
.dl-card.is-you { order: -1; }
.dl-card.is-you h3::after {
  content: "适合你的设备";
  display: inline-block; margin-left: 8px; vertical-align: 2px;
  padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; letter-spacing: .5px; color: #fff;
  background: linear-gradient(120deg, var(--brand1), var(--brand2));
}
[data-device-note] {
  display: inline-flex; align-items: center; gap: 8px;
  margin: -20px 0 24px; padding: 7px 15px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink-soft); font-size: 13.5px;
}
[data-device-note]::before { content: "●"; color: var(--brand1); font-size: 10px; line-height: 1; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 首屏 */
.hero {
  position: relative; overflow: hidden;
  padding: 96px 0 104px;
  background: var(--dark);
  color: #fff; text-align: center;
}
.hero::before, .hero::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(90px); opacity: .55;
}
.hero::before { width: 520px; height: 520px; background: var(--brand1); top: -160px; left: -120px; }
.hero::after { width: 520px; height: 520px; background: var(--brand2); bottom: -200px; right: -120px; }
.hero-inner { position: relative; z-index: 1; padding: 60px 24px; }
.hero-icon {
  width: 128px; height: 128px; border-radius: 30px;
  box-shadow: 0 24px 60px rgba(74, 125, 255, .45);
}
.hero h1 {
  font-size: 66px; line-height: 1.1; margin: 26px 0 10px; letter-spacing: .5px;
  background: linear-gradient(120deg, #fff 30%, #cfd8ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub { font-size: 21px; color: rgba(255, 255, 255, .82); margin: 0 0 34px; }
.hero .meta { margin-top: 18px; font-size: 13.5px; color: rgba(255, 255, 255, .5); }
.hero-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.hero .btn-ghost { border-color: rgba(255, 255, 255, .32); color: #fff; }
.hero .btn-ghost:hover { border-color: #fff; color: #fff; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 34px; border-radius: 999px; font-size: 16px; font-weight: 600;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(120deg, var(--brand1), var(--brand2));
  color: #fff; box-shadow: 0 12px 30px rgba(74, 125, 255, .38);
}
.btn-ghost { border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--brand1); color: var(--brand1); }
.btn-sm { padding: 9px 20px; font-size: 14px; }

/* 功能大栏 */
.feature {
  padding: 84px 0;
  border-bottom: 1px solid var(--line);
}
.feature .wrap { width: 100%; }
.feature-grid {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.feature-num {
  font-size: 15px; font-weight: 700; letter-spacing: 3px; color: var(--brand1);
}
.feature h2 { font-size: 40px; margin: 10px 0 16px; letter-spacing: .5px; }
.feature p { font-size: 17px; color: var(--ink-soft); margin: 0; max-width: 46ch; }
.feature-visual {
  aspect-ratio: 4 / 3; border-radius: 24px;
  background: var(--bg-soft); border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
}
.feature-visual svg { width: 42%; height: 42%; }
.feature.dark { background: var(--dark); color: #fff; border-color: rgba(255, 255, 255, .08); }
.feature.dark .feature-num { color: #8fa9ff; }
.feature.dark p { color: rgba(255, 255, 255, .68); }
.feature.dark .feature-visual {
  background: var(--dark-soft); border-color: rgba(255, 255, 255, .1);
}
.feature.dark .feature-visual svg { stroke: #cfd8ff; }
.feature-grid.flip .feature-visual { order: -1; }

/* 末尾下载栏 */
.cta {
  background: linear-gradient(120deg, var(--brand1), var(--brand2));
  color: #fff; text-align: center; padding: 110px 24px;
}
.cta h2 { font-size: 38px; margin: 0 0 12px; }
.cta p { color: rgba(255, 255, 255, .85); margin: 0 0 30px; }
.cta .btn { background: #fff; color: #4a4dd8; box-shadow: 0 14px 34px rgba(0, 0, 0, .22); }

/* 通用内容页 */
.page { padding: 56px 0 40px; }
.page h1 { font-size: 34px; margin: 0 0 8px; }
.page .lead { color: var(--ink-soft); margin: 0 0 34px; }
.block { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 26px; background: #fff; }
.block + .block { margin-top: 18px; }
.grid2 + .block { margin-top: 18px; }
.block h2 { font-size: 20px; margin: 0 0 10px; }
.block p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: stretch; }
.grid2 > .block + .block { margin-top: 0; }
.dl-card { display: flex; flex-direction: column; }
.dl-card .actions { margin-top: auto; }
.dl-card h3 { margin: 0 0 4px; font-size: 19px; }
.dl-card .file { color: var(--ink); font-size: 14px; margin: 0 0 4px; }
.dl-card .hint { color: var(--ink-soft); font-size: 14px; margin: 0 0 18px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
ol.steps { margin: 10px 0 0; padding-left: 20px; color: var(--ink-soft); }
ol.steps li { margin-bottom: 6px; }
details {
  border: 1px solid var(--line); border-radius: 14px; padding: 12px 18px; margin-bottom: 12px; background: #fff;
}
details summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 2px; color: var(--ink-soft); font-size: 15px; }
.tip { color: var(--ink-soft); font-size: 14px; }

/* 更新日志 */
.release { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 26px; background: #fff; margin-bottom: 18px; }
.release h2 { margin: 0; font-size: 22px; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.release h2 span { font-size: 14px; font-weight: 400; color: var(--ink-soft); }
.release ul { margin: 14px 0 18px; padding-left: 20px; color: var(--ink-soft); font-size: 15px; }
.release ul li { margin-bottom: 6px; }
.pkg { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.pkg .lbl { font-size: 14px; color: var(--ink-soft); margin-right: 2px; }

/* 页脚 */
.footer { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 30px 0 44px; }
.footer p { margin: 0 0 8px; font-size: 14px; color: var(--ink-soft); }
.footer .dim { font-size: 13px; color: #8a90a0; }

.risk {
  background: #fff5f5; border: 1px solid #f3c6c6; border-radius: var(--radius);
  padding: 18px 22px; color: #8a2b2b; font-size: 14.5px;
}
.risk b { color: #b42318; }

@media (max-width: 900px) {
  .hero { padding: 64px 0 72px; }
  .hero h1 { font-size: 46px; }
  .hero .sub { font-size: 18px; }
  .feature { padding: 56px 0; }
  .feature-grid { grid-template-columns: 1fr; gap: 28px; }
  .feature-grid.flip .feature-visual { order: 0; }
  .feature h2 { font-size: 28px; }
  .grid2 { grid-template-columns: 1fr; }
}

/* 手机 / 小平板：顶部栏收起为侧边抽屉 */
@media (max-width: 860px) {
  .nav nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-inner { height: 58px; padding: 0 16px; }
  .brand { font-size: 17px; }
  .brand img { width: 28px; height: 28px; }
}

/* 手机竖屏排布细节 */
@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .hero { padding: 44px 0 52px; }
  .hero-inner { padding: 36px 18px 0; }
  .hero-icon { width: 96px; height: 96px; border-radius: 24px; }
  .hero h1 { font-size: 40px; margin: 20px 0 8px; }
  .hero .sub { font-size: 16.5px; margin-bottom: 26px; }
  .hero .meta { margin-top: 14px; font-size: 12.5px; }
  .hero .btn { padding: 12px 26px; font-size: 15px; }
  .feature { padding: 44px 0; }
  .feature h2 { font-size: 24px; margin: 8px 0 12px; }
  .feature p { font-size: 15.5px; }
  .feature-visual { aspect-ratio: 16 / 10; border-radius: 18px; }
  .cta { padding: 62px 18px; }
  .cta h2 { font-size: 26px; }
  .cta p { font-size: 15px; }
  .page { padding: 36px 0 26px; }
  .page h1 { font-size: 27px; }
  .page .lead { margin-bottom: 26px; }
  .block, .release { padding: 18px 18px; border-radius: 15px; }
  .block h2 { font-size: 18px; }
  .block p, .release ul, details p { font-size: 14.5px; }
  .release h2 { font-size: 19px; }
  .release ul { padding-left: 18px; }
  .risk { padding: 15px 16px; font-size: 13.5px; }
  .footer { padding: 24px 0 34px; }
  details summary { padding: 2px 0; }
  [data-device-note] { margin: -14px 0 20px; }
}