:root {
  color-scheme: light dark;
  --bg: #f7f7fb;
  --bg-soft: #efeff7;
  --card: #ffffff;
  --fg: #17181f;
  --fg-2: #4f5160;
  --fg-3: #8a8c99;
  --line: rgba(23, 24, 31, 0.09);
  --accent: #6b7cff;
  --accent-fg: #5161e8;
  --grad: linear-gradient(120deg, #6b7cff, #a874c8 55%, #e5687a);
  --shadow: 0 1px 2px rgba(20, 20, 50, 0.05), 0 12px 32px rgba(40, 40, 100, 0.08);
  --shadow-lg: 0 2px 6px rgba(20, 20, 50, 0.06), 0 30px 80px rgba(60, 50, 140, 0.18);
  --code: rgba(107, 124, 255, 0.1);
  --nav: rgba(247, 247, 251, 0.78);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111116;
    --bg-soft: #17171e;
    --card: #1c1c24;
    --fg: #f1f1f6;
    --fg-2: #b4b5c2;
    --fg-3: #80818f;
    --line: rgba(255, 255, 255, 0.09);
    --accent-fg: #9aa6ff;
    --shadow: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 12px 32px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 30px 80px rgba(0, 0, 0, 0.55);
    --code: rgba(154, 166, 255, 0.14);
    --nav: rgba(17, 17, 22, 0.75);
  }
}

/* 只显示选中的语言 */
:root[data-lang="zh"] [data-l="en"],
:root[data-lang="en"] [data-l="zh"] { display: none !important; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
:root[data-lang="en"] body { line-height: 1.6; }
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--accent-fg); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, p { margin: 0; }
code { padding: 1px 6px; border-radius: 6px; background: var(--code); font: 0.9em/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
kbd {
  display: inline-block;
  min-width: 26px;
  padding: 1px 8px;
  border-radius: 7px;
  background: var(--card);
  box-shadow: 0 0 0 1px var(--line), 0 1px 0 var(--line);
  font: 600 13px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-align: center;
  white-space: nowrap;
}
.wrap { width: min(1120px, 100% - 40px); margin: 0 auto; }
.wrap.wide { width: min(1400px, 100% - 40px); }
.title { font-size: clamp(26px, 4vw, 36px); line-height: 1.25; letter-spacing: -0.01em; text-align: center; }
.sub { margin-top: 10px; color: var(--fg-3); text-align: center; }

/* 顶部导航 */
.nav { position: sticky; top: 0; z-index: 10; background: var(--nav); backdrop-filter: saturate(1.6) blur(16px); -webkit-backdrop-filter: saturate(1.6) blur(16px); border-bottom: 1px solid var(--line); }
.nav-in { display: flex; align-items: center; gap: 8px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; color: var(--fg); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; }
.links { display: flex; gap: 4px; }
.links a, .lang, .gh { padding: 6px 12px; border-radius: 9px; color: var(--fg-2); font-size: 15px; }
.links a:hover, .lang:hover, .gh:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.lang { border: 0; background: none; font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; }
.gh { display: grid; place-items: center; padding: 6px 8px; }

/* 首屏 */
.hero { position: relative; padding: 64px 0 28px; text-align: center; }
.hero::before {
  content: "";
  position: absolute;
  inset: -120px 0 auto;
  height: 760px;
  z-index: -1;
  background:
    radial-gradient(500px 340px at 18% 30%, rgba(107, 124, 255, 0.22), transparent 70%),
    radial-gradient(520px 360px at 85% 20%, rgba(229, 104, 122, 0.16), transparent 70%),
    radial-gradient(480px 320px at 55% 75%, rgba(168, 116, 200, 0.14), transparent 70%);
}
.pill { display: inline-flex; align-items: center; gap: 9px; padding: 5px 14px; border-radius: 999px; background: var(--card); box-shadow: var(--shadow); color: var(--fg-2); font-size: 14px; font-weight: 600; }
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--grad); }
.hero h1 { margin-top: 22px; font-size: clamp(32px, 6.4vw, 68px); line-height: 1.12; letter-spacing: -0.02em; font-weight: 800; }
.pill .ver { padding: 1px 8px; border-radius: 999px; background: var(--bg-soft); color: var(--fg-3); font-size: 12.5px; font-variant-numeric: tabular-nums; }
.pill .ver:empty { display: none; }
:root[data-lang="zh"] .hero h1 { letter-spacing: 0.01em; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 760px; margin: 22px auto 0; color: var(--fg-2); font-size: clamp(16px, 2vw, 19px); }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 32px; }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 46px; padding: 0 20px; border-radius: 12px; background: var(--card); box-shadow: var(--shadow); color: var(--fg); font-weight: 600; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: var(--grad); color: #fff; box-shadow: 0 10px 26px rgba(122, 108, 230, 0.35); }
.btn.small { height: 36px; padding: 0 14px; margin-top: 14px; border-radius: 10px; font-size: 14px; }
.meta { margin-top: 18px; color: var(--fg-3); font-size: 14px; }

.player { position: relative; margin: 36px auto 0; max-width: 1040px; border-radius: 18px; overflow: hidden; background: #ecebf6; box-shadow: var(--shadow-lg); aspect-ratio: 16 / 9; }
.player video { width: 100%; height: 100%; object-fit: cover; }
.play { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; border: 0; background: linear-gradient(180deg, transparent 40%, rgba(20, 18, 40, 0.28)); color: #fff; font: inherit; cursor: pointer; }
.play[hidden] { display: none; }
.play .circle { display: grid; place-items: center; width: 84px; height: 84px; padding-left: 4px; border-radius: 50%; background: var(--grad); box-shadow: 0 14px 40px rgba(110, 90, 220, 0.5); transition: transform 0.2s; }
.play:hover .circle { transform: scale(1.06); }
.play .label { padding: 6px 14px; border-radius: 999px; background: rgba(20, 18, 40, 0.55); backdrop-filter: blur(8px); font-size: 15px; font-weight: 600; }

/* 在线试用:左边是假的浏览器窗口(样式见 demo/demo.css),右边是任务清单 */
.try { padding: 24px 0 72px; }
.try-head { max-width: 760px; margin: 0 auto 26px; text-align: center; }
.try-head h2 { font-size: clamp(24px, 3.4vw, 32px); }
.try-head p { margin-top: 8px; color: var(--fg-2); }
.try-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 22px; align-items: start; }
.demo-host { min-width: 0; }
.quests { position: sticky; top: 76px; padding: 20px 18px 16px; border-radius: 18px; background: var(--card); box-shadow: var(--shadow); }
.q-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; font-size: 16px; }
.q-count { color: var(--fg-3); font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.q-bar { height: 6px; margin: 12px 0 14px; border-radius: 3px; background: var(--bg-soft); overflow: hidden; }
.q-bar i { display: block; height: 100%; width: 0; border-radius: 3px; background: var(--grad); transition: width 0.4s cubic-bezier(.22, 1, .36, 1); }
.q-list { margin: 0; padding: 0; list-style: none; }
.q-item { position: relative; display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 2px 10px; padding: 9px 8px; border-radius: 12px; transition: background 0.2s; }
.q-item.flash { animation: q-flash 1.4s ease-out; }
@keyframes q-flash { 0%, 40% { background: color-mix(in srgb, var(--accent) 22%, transparent); } }
.q-check { grid-row: span 2; width: 22px; height: 22px; margin-top: 1px; display: grid; place-items: center; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--line); color: transparent; transition: background 0.25s, box-shadow 0.25s, color 0.25s; }
.q-check svg { width: 13px; height: 13px; }
.q-item b { font-size: 14.5px; line-height: 1.4; }
.q-item p { color: var(--fg-3); font-size: 13px; line-height: 1.5; }
.q-item.done .q-check { background: var(--grad); box-shadow: none; color: #fff; animation: q-pop 0.4s cubic-bezier(.34, 1.56, .64, 1); }
.q-item.done b { color: var(--fg-3); text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--fg-3) 60%, transparent); }
@keyframes q-pop { from { transform: scale(0.4); } }
.q-done { margin: 10px 8px 0; padding: 10px 12px; border-radius: 12px; background: color-mix(in srgb, var(--accent) 14%, transparent); font-size: 14px; font-weight: 600; }
.q-done[hidden] { display: none; }
.q-reset { display: inline-flex; align-items: center; gap: 6px; margin: 10px 8px 0; padding: 6px 10px; border: 0; border-radius: 9px; background: var(--bg-soft); color: var(--fg-2); font: inherit; font-size: 13px; font-weight: 600; cursor: pointer; }
.q-reset:hover { color: var(--fg); }
.try-btn { display: inline-flex; align-items: center; gap: 6px; margin-top: 18px; padding: 8px 14px; border: 0; border-radius: 10px; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent-fg); font: inherit; font-size: 14.5px; font-weight: 600; cursor: pointer; }
.try-btn:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }
.try-btn.small { margin-top: 12px; padding: 5px 11px; font-size: 13.5px; }

/* 视频 */
.video { padding: 64px 0 24px; background: var(--bg-soft); }
.video .player { max-width: 1040px; margin-bottom: 40px; }

/* 功能介绍 */
.features { padding: 80px 0 24px; }
.feature { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: center; gap: 56px; margin-bottom: 96px; }
.feature.flip .text { order: 2; }
.eyebrow { color: var(--accent-fg); font-size: 14px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; }
.feature h2 { margin-top: 10px; font-size: clamp(24px, 3vw, 32px); line-height: 1.3; }
.feature .text > p:not(.eyebrow) { margin-top: 16px; color: var(--fg-2); }
.feature ul { margin: 18px 0 0; padding: 0; list-style: none; }
.feature li { position: relative; margin: 8px 0; padding-left: 22px; color: var(--fg-2); }
.feature li::before { content: ""; position: absolute; left: 2px; top: 0.62em; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px rgba(107, 124, 255, 0.2); }
.shot img { width: 100%; border-radius: 16px; box-shadow: var(--shadow-lg); }

/* 更多细节 */
.more { padding: 40px 0 96px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 40px; }
.item { padding: 24px; border-radius: 18px; background: var(--card); box-shadow: var(--shadow); }
.item .ic { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; background: color-mix(in srgb, var(--c) 15%, transparent); color: var(--c); }
.item .ic svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.item h3 { margin-top: 16px; font-size: 18px; }
.item p { margin-top: 6px; color: var(--fg-2); font-size: 15px; }

/* 安装 */
.install { padding: 88px 0; background: var(--bg-soft); }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin: 40px 0 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { position: relative; padding: 26px 24px 24px; border-radius: 18px; background: var(--card); box-shadow: var(--shadow); counter-increment: step; }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 34px; height: 34px; margin-bottom: 14px; border-radius: 50%; background: var(--grad); color: #fff; font-weight: 700; }
.steps h3 { font-size: 18px; }
.steps p { margin-top: 6px; color: var(--fg-2); font-size: 15px; }
.code { display: flex; align-items: center; gap: 8px; margin-top: 14px; padding: 6px 6px 6px 12px; border-radius: 10px; background: var(--bg-soft); }
.code code { flex: 1; min-width: 0; padding: 0; overflow-x: auto; background: none; white-space: nowrap; font-size: 13px; }
.copy { flex: none; height: 30px; padding: 0 12px; border: 0; border-radius: 8px; background: var(--card); box-shadow: 0 0 0 1px var(--line); color: var(--fg-2); font: inherit; font-size: 13px; font-weight: 600; cursor: pointer; }
.copy:hover { color: var(--fg); }
.keys { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 8px 12px; margin-top: 14px; color: var(--fg-3); font-size: 14px; }
.keys kbd { justify-self: start; }
.tip { display: flex; gap: 14px; align-items: flex-start; max-width: 820px; margin: 28px auto 0; padding: 18px 20px; border-radius: 16px; background: var(--card); box-shadow: var(--shadow); color: var(--fg-2); font-size: 15px; }
.tip svg { flex: none; margin-top: 3px; color: var(--accent-fg); }
.tip b { color: var(--fg); }

/* 快捷键 */
.shortcuts { padding: 88px 0; }
.table { max-width: 820px; margin: 36px auto 0; overflow-x: auto; border-radius: 16px; background: var(--card); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { padding: 13px 18px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--fg-3); font-size: 13px; font-weight: 600; }
tr:last-child td { border-bottom: 0; }
td:first-child { color: var(--fg-2); }

/* 隐私 */
.privacy { padding: 0 0 96px; }
.privacy .panel { max-width: 820px; margin: 0 auto; padding: 44px 40px; border-radius: 24px; background: var(--card); box-shadow: var(--shadow); text-align: center; }
.shield { display: inline-grid; place-items: center; width: 60px; height: 60px; border-radius: 18px; background: var(--grad); color: #fff; }
.privacy h2 { margin-top: 18px; font-size: clamp(24px, 3.4vw, 32px); }
.privacy .panel > p { margin-top: 14px; color: var(--fg-2); }
details { margin-top: 24px; text-align: left; }
summary { width: fit-content; margin: 0 auto; padding: 8px 16px; border-radius: 10px; background: var(--bg-soft); color: var(--fg); font-weight: 600; cursor: pointer; }
.perms { display: grid; grid-template-columns: auto 1fr; gap: 10px 18px; margin: 22px 0 0; font-size: 14.5px; }
.perms dt { font: 600 13px/1.9 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--accent-fg); }
.perms dd { margin: 0; color: var(--fg-2); }
.more-link { display: inline-block; margin-top: 22px; font-weight: 600; }

/* 页脚 */
.foot { padding: 28px 0 40px; border-top: 1px solid var(--line); }
.foot-in { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.foot .brand { font-size: 16px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 6px 20px; font-size: 14px; }
.foot nav a { color: var(--fg-3); }
/* 赞助:和 GitHub 的 Sponsor 按钮一样用粉色的心 */
.foot nav a.sponsor span[aria-hidden] { color: #db61a2; }

@media (max-width: 1180px) {
  .try-grid { grid-template-columns: minmax(0, 1fr); }
  .quests { position: static; }
  .q-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0 12px; }
}
@media (max-width: 900px) {
  .feature, .feature.flip { grid-template-columns: minmax(0, 1fr); gap: 28px; margin-bottom: 72px; }
  .feature.flip .text { order: 0; }
  .grid, .steps { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .wrap, .wrap.wide { width: calc(100% - 32px); }
  .links { display: none; }
  .hero { padding-top: 48px; }
  .player { margin-top: 36px; border-radius: 12px; }
  .play .circle { width: 64px; height: 64px; }
  .privacy .panel { padding: 32px 20px; }
  .perms { grid-template-columns: 1fr; gap: 2px; }
  .perms dd { margin-bottom: 10px; }
  th, td { padding: 11px 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}