:root {
  color-scheme: light;
  --bg: #e9f3fc;
  --card: #ffffff;
  --line: rgba(88, 123, 178, .2);
  --text: #17243b;
  --muted: #61718a;
  --accent: #366bd8;
  --accent-hover: #285bc3;
  --accent-soft: #e9f0ff;
  --surface: rgba(255, 255, 255, .76);
  --shadow: 0 24px 70px rgba(39, 75, 133, .13);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100svh;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; }
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background: radial-gradient(ellipse at 24% 10%, #f1fbff, #d9eaf7 65%, #d2e3f5);
}
.backdrop-character { display: none; }
.water-surface { display: block; width: 100%; height: 100%; opacity: .53; }
.water-surface[hidden] { display: none; }
.wrap { position: relative; z-index: 3; width: min(1180px, calc(100% - 64px)); margin-inline: auto; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 88px;
  border-bottom: 1px solid rgba(100, 133, 183, .18);
}
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; text-decoration: none; }
.brand img { display: block; width: 36px; height: 36px; border-radius: 10px; box-shadow: 0 5px 12px rgba(50, 92, 162, .13); }
.brand-name { font-size: 20px; font-weight: 800; letter-spacing: -.04em; white-space: nowrap; }
.brand-caption { margin-left: 7px; color: var(--muted); font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.gh, .icon-control, .lang {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 2px 10px rgba(46, 80, 132, .04);
  transition: background .2s, border-color .2s, transform .2s;
}
.gh:hover, .icon-control:hover, .lang:hover { border-color: rgba(54, 107, 216, .45); background: var(--card); transform: translateY(-1px); }
.gh { gap: 7px; padding: 0 11px; text-decoration: none; font-size: 13px; font-weight: 700; }
.gh .mark { width: 17px; height: 17px; fill: currentColor; }
.gh-name { white-space: nowrap; }
.stars { display: inline-flex; align-items: center; gap: 4px; padding-left: 9px; border-left: 1px solid var(--line); color: var(--muted); font-variant-numeric: tabular-nums; font-weight: 600; }
.stars svg { width: 13px; height: 13px; fill: #e4a623; }
.icon-control { width: 38px; padding: 0; cursor: pointer; }
.icon-control svg, .lang svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon-control .moon { display: none; }
.lang { gap: 7px; padding: 0 11px; cursor: pointer; font-size: 13px; font-weight: 700; white-space: nowrap; }
.stage {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(36px, 5vw, 86px);
  min-height: min(760px, calc(100svh - 88px));
  padding-block: 76px 90px;
  pointer-events: auto;
}
.copy { max-width: 520px; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 21px; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 20px; height: 2px; border-radius: 2px; background: currentColor; }
h1 { margin: 0; font-size: clamp(45px, 5vw, 70px); line-height: 1.14; font-weight: 800; letter-spacing: -.055em; }
h1 span { display: block; }
.title-name { color: var(--accent); }
.title-rest { margin-top: 3px; font-size: clamp(34px, 3.55vw, 49px); letter-spacing: -.045em; }
.lead { margin: 24px 0 0; max-width: 420px; color: var(--muted); font-size: 17px; line-height: 1.75; }
.cta { display: flex; flex-wrap: wrap; align-items: stretch; gap: 11px; margin-top: 34px; }
/* 按钮整体就是下拉：点整块展开包列表，菜单项自带下载地址 */
.split { position: relative; display: inline-flex; }
.split-trigger { font: inherit; cursor: pointer; }
.split-trigger:active { transform: translateY(0) scale(.985); }
.split-trigger:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.split-caret { display: inline-flex; align-items: center; margin-left: -3px; opacity: .75; transition: transform .22s cubic-bezier(.34, 1.4, .64, 1); }
.split-caret svg { width: 13px; height: 13px; }
.split[data-open="true"] .split-caret { transform: rotate(180deg); }
/* 菜单用 opacity / transform 过渡，不用 display——display 变不了，才没有动画可看 */
.split-menu {
  position: absolute; top: calc(100% + 7px); left: 0; z-index: 30;
  min-width: 100%; padding: 5px;
  display: flex; flex-direction: column; gap: 2px;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--card);
  box-shadow: 0 18px 40px rgba(19, 32, 61, .18);
  transform-origin: top left;
  opacity: 0; transform: translateY(-6px) scale(.96); visibility: hidden; pointer-events: none;
  transition: opacity .16s ease, transform .2s cubic-bezier(.34, 1.4, .64, 1), visibility 0s linear .2s;
}
.split[data-open="true"] .split-menu {
  opacity: 1; transform: translateY(0) scale(1); visibility: visible; pointer-events: auto;
  transition: opacity .18s ease, transform .22s cubic-bezier(.34, 1.4, .64, 1), visibility 0s;
}
.split-menu a {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 8px 10px; border-radius: 8px;
  color: var(--text); text-decoration: none; white-space: nowrap;
  font-size: 13px; font-weight: 620;
  transition: background .16s, color .16s, transform .16s;
}
.split-menu a:hover { background: rgba(54, 107, 216, .09); color: var(--accent); transform: translateX(2px); }
.menu-hint { color: var(--muted); font-size: 11.5px; font-weight: 500; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 51px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 13px;
  text-decoration: none;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 750;
  transition: transform .2s, background .2s, border-color .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); }
/* .btn 是 inline-flex，[hidden] 的默认 display:none 会被压过去，得显式写一条 */
.btn[hidden] { display: none; }
.btn svg { width: 19px; height: 19px; fill: currentColor; }
.btn-go { background: var(--accent); color: #fff; box-shadow: 0 10px 22px rgba(54, 107, 216, .22); }
.btn-go:hover { background: var(--accent-hover); box-shadow: 0 12px 25px rgba(54, 107, 216, .28); }
.btn-alt { background: var(--surface); border-color: var(--line); color: var(--text); }
.btn-alt:hover { background: var(--card); border-color: rgba(54, 107, 216, .42); }
.apple-mark { display: block; width: 19px; height: 19px; background: currentColor; -webkit-mask: url("./apple.svg") center / contain no-repeat; mask: url("./apple.svg") center / contain no-repeat; }
.download-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 16px; min-height: 29px; margin-top: 14px; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.dl { display: inline-flex; align-items: center; gap: 5px; }
.dl[hidden] { display: none; }
.dl svg { width: 14px; height: 14px; fill: currentColor; }
.dl b { color: var(--text); font-weight: 750; }
.ver-link { text-decoration: none; color: var(--muted); transition: color .16s; }
.ver-link:hover { color: var(--accent); }
.cta-note { margin: 6px 0 0; max-width: 420px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.links { display: flex; flex-wrap: wrap; align-items: center; gap: 11px; margin-top: 37px; }
.links-label { width: 100%; margin-bottom: 1px; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.social-link { display: inline-flex; align-items: center; gap: 8px; min-height: 37px; padding: 0 13px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--text); text-decoration: none; font-size: 12px; font-weight: 700; transition: background .2s, border-color .2s, transform .2s; }
.social-link:hover { background: var(--card); border-color: rgba(54, 107, 216, .42); transform: translateY(-1px); }
.social-link svg { width: 17px; height: 17px; fill: currentColor; }
/* 社区链接只留图标：和右上角那几个控件同宽同高，排成一排才齐 */
.social-icon { width: 38px; padding: 0; justify-content: center; }
.social-icon svg { width: 18px; height: 18px; }
.note { display: flex; align-items: flex-start; gap: 8px; margin: 21px 0 0; max-width: 420px; color: var(--muted); font-size: 11px; line-height: 1.65; }
.note svg { flex: 0 0 14px; width: 14px; height: 14px; margin-top: 2px; }
.visual { position: relative; min-width: 0; }
.visual::before { content: ""; position: absolute; inset: 5% -4% -7% 9%; z-index: -1; border: 1px solid rgba(91, 127, 181, .16); border-radius: 27px; background: rgba(255, 255, 255, .17); transform: rotate(4deg); }
.shot { overflow: hidden; margin: 0; border: 1px solid rgba(82, 116, 171, .2); border-radius: 18px; background: var(--card); box-shadow: var(--shadow); }
.shot-bar { display: flex; align-items: center; gap: 5px; height: 39px; padding: 0 14px; border-bottom: 1px solid var(--line); background: var(--surface); }
.shot-bar i { display: block; width: 7px; height: 7px; border-radius: 50%; background: #b3c4df; }
.shot-bar span { margin-left: auto; color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .13em; }
.shot img { display: block; width: 100%; height: auto; }
.preview-caption { display: flex; align-items: center; gap: 8px; margin: 18px 0 0; color: var(--muted); font-size: 12px; }
.preview-caption::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; padding-bottom: 40px; }
.feature { min-height: 150px; padding: 23px 24px; border: 1px solid var(--line); border-radius: 17px; background: var(--surface); box-shadow: 0 9px 26px rgba(49, 84, 133, .045); }
.feature-number { color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: .13em; }
.feature h2 { margin: 13px 0 7px; font-size: 17px; letter-spacing: -.02em; }
.feature p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
.previews { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; padding-bottom: 72px; }
.previews figure { min-width: 0; margin: 0; }
.previews img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.previews figcaption { margin-top: 13px; color: var(--muted); font-size: 12px; }
/* 问答用原生 details/summary：没有脚本，开合状态也不受中英切换影响（切换只重写文本） */
.faq { padding-bottom: 72px; }
.faq-heading { display: flex; align-items: baseline; gap: 12px; margin: 0 0 16px; font-size: 19px; letter-spacing: -.02em; }
.faq-kicker { color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: .13em; }
.faq-list { display: grid; gap: 10px; }
.faq-item { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: 0 9px 26px rgba(49, 84, 133, .045); }
.faq-item summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 20px; list-style: none; cursor: pointer; font-size: 14px; font-weight: 700; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::marker { content: ""; }
.faq-item summary::after { content: "+"; flex: none; display: grid; place-items: center; width: 22px; height: 22px; border: 1px solid var(--line); border-radius: 50%; color: var(--muted); font-size: 15px; font-weight: 600; line-height: 1; }
.faq-item summary:hover { color: var(--accent); }
.faq-item[open] summary::after { content: "−"; color: var(--accent); }
.faq-item p { margin: 0; padding: 0 20px 17px; color: var(--muted); font-size: 12.5px; line-height: 1.75; }
.site-footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px 24px; padding-block: 22px 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; line-height: 1.6; }
.site-footer a { color: inherit; text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

html[data-color-scheme="dark"] {
  color-scheme: dark;
  --bg: #18181b;
  --card: #27272b;
  --line: rgba(149, 149, 158, .25);
  --text: #f4f4f5;
  --muted: #b8b8bc;
  --accent: #f0f0f2;
  --accent-hover: #fff;
  --accent-soft: #34353a;
  --surface: rgba(39, 39, 43, .8);
  --shadow: 0 24px 70px rgba(0, 0, 0, .32);
}
html[data-color-scheme="dark"] .backdrop { background: radial-gradient(ellipse at 24% 10%, #303035, #1c1c21 62%, #151519); }
html[data-color-scheme="dark"] .water-surface { opacity: .72; }
html[data-color-scheme="dark"] .btn-go { color: #25252b; box-shadow: 0 10px 22px rgba(0, 0, 0, .2); }
html[data-color-scheme="dark"] .visual::before { background: rgba(64, 64, 70, .18); border-color: rgba(165, 165, 175, .14); }
html[data-color-scheme="dark"] .shot-bar i { background: #7b7b83; }
html[data-color-scheme="dark"] .icon-control .sun { display: none; }
html[data-color-scheme="dark"] .icon-control .moon { display: block; }
@media (max-width: 980px) {
  .stage { grid-template-columns: 1fr; gap: 46px; min-height: 0; padding-block: 64px 56px; }
  .copy { max-width: 650px; }
  .visual { max-width: 700px; }
}
@media (max-width: 640px) {
  .wrap { width: min(100% - 36px, 1180px); }
  .site-header { min-height: 72px; gap: 10px; }
  .brand img { width: 32px; height: 32px; }
  .brand-caption, .gh-name { display: none; }
  .gh { padding: 0 10px; }
  .header-actions { gap: 7px; }
  .stage { padding-block: 54px 45px; gap: 39px; }
  .eyebrow { margin-bottom: 16px; }
  h1 { font-size: clamp(42px, 11vw, 57px); }
  .title-rest { font-size: clamp(30px, 8vw, 42px); }
  .lead { margin-top: 18px; font-size: 15px; }
  .cta { margin-top: 27px; }
  .btn { flex: 1 1 190px; }
  .links { margin-top: 29px; }
  .features { grid-template-columns: 1fr; gap: 10px; padding-bottom: 48px; }
  .previews { grid-template-columns: 1fr; padding-bottom: 48px; }
  .faq { padding-bottom: 48px; }
  .faq-item summary { padding: 14px 16px; font-size: 13px; }
  .faq-item p { padding: 0 16px 15px; }
  .visual::before { display: none; }
  .feature { min-height: 0; padding: 19px 20px; }
  .feature h2 { margin-top: 9px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}