/* ServerIsland 官网：配色、圆角、卡片和 App / 宣传视频保持一致（深色）。 */
:root {
  --bg: #07090f;
  --bg-2: #0d1120;
  --mint: #5BE6B5;
  --cyan: #5CC2FF;
  --amber: #FFBF4D;
  --coral: #FF6E6E;
  --violet: #A88CFF;
  --text: rgba(255, 255, 255, 0.94);
  --sec: rgba(255, 255, 255, 0.62);
  --ter: rgba(255, 255, 255, 0.38);
  --card: rgba(255, 255, 255, 0.06);
  --card-2: rgba(255, 255, 255, 0.035);
  --line: rgba(255, 255, 255, 0.10);
  --track: rgba(255, 255, 255, 0.10);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Rounded", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --radius: 18px;
  --max: 1120px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
code, pre { font-family: var(--mono); }

/* 中英文切换：只显示当前语言 */
html[data-lang="zh"] [lang="en"] { display: none !important; }
html[data-lang="en"] [lang="zh"] { display: none !important; }

/* ---------------------------------------------------------------- 导航 */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; gap: 24px;
  height: 60px; padding: 0 max(16px, calc((100vw - var(--max)) / 2));
  background: rgba(7, 9, 15, 0.6);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(7, 9, 15, 0.82); }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; letter-spacing: .2px; }
.nav-links { display: flex; gap: 22px; margin-left: 12px; font-size: 14.5px; color: var(--sec); white-space: nowrap; }
.nav-right > * { white-space: nowrap; }
.nav-links a:hover { color: var(--text); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.gh-link { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; color: var(--sec); }
.gh-link:hover { color: var(--text); }
.btn svg { flex: none; }
.star-count { display: inline-flex; align-items: center; gap: 4px; padding: 1px 8px; border-radius: 999px; background: rgba(255,191,77,.14); color: var(--amber); font-size: 12.5px; font-weight: 700; }
.star-count[hidden] { display: none; }
.star-count svg { width: 12px; height: 12px; }
.star-cta { max-width: 620px; margin: 28px auto 8px; padding: 18px 22px; border-radius: var(--radius); background: var(--card-2); border: 1px solid var(--line); }
.star-cta p { margin: 0 0 12px; color: var(--sec); font-size: 14.5px; }
.star-cta code { color: var(--mint); }
.lang-toggle {
  font: inherit; font-size: 13px; color: var(--sec); cursor: pointer;
  background: transparent; border: 1px solid var(--line); border-radius: 999px; padding: 4px 11px;
}
.lang-toggle:hover { color: var(--text); border-color: rgba(255,255,255,.22); }

/* ---------------------------------------------------------------- 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; border-radius: 999px; padding: 12px 22px; font-size: 15.5px;
  transition: transform .15s, box-shadow .2s, background .2s, color .2s;
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn-primary {
  color: #04140e;
  background: linear-gradient(135deg, var(--mint), #7CCBFF);
  box-shadow: 0 8px 30px rgba(91, 230, 181, .28);
}
.btn-primary:hover { box-shadow: 0 10px 40px rgba(91, 230, 181, .45); transform: translateY(-1px); }
.btn-ghost { color: var(--text); background: var(--card); border: 1px solid var(--line); }
.btn-ghost:hover { background: rgba(255,255,255,.1); }
.btn-small { padding: 6px 14px; font-size: 13.5px; color: #04140e; background: var(--mint); }
.btn-large { padding: 15px 30px; font-size: 17px; }

/* ---------------------------------------------------------------- 首屏 */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 108px 16px 64px;
  display: flex; flex-direction: column; align-items: center;
  overflow: hidden;
}
.hero-sky { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }
.hero-inner { position: relative; z-index: 4; text-align: center; max-width: 820px; }
.hero-tako { display: block; margin: 0 auto 6px; filter: drop-shadow(0 0 22px rgba(91,230,181,.45)); animation: tako-bob 2.4s ease-in-out infinite; }
@keyframes tako-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.pixel-word { width: min(560px, 88vw); height: auto; aspect-ratio: 560 / 96; display: block; margin: 0 auto 10px; }
.hero h1 {
  margin: 4px 0 12px;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.12; letter-spacing: -0.5px; font-weight: 800;
}
.lead { color: var(--sec); font-size: clamp(15.5px, 2vw, 18.5px); margin: 0 auto 26px; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 40; }
.fine { color: var(--ter); font-size: 13px; margin-top: 14px; }

/* Mac 屏幕顶部 + 刘海演示 */
.mac {
  position: relative; z-index: 1;
  width: min(980px, 100%);
  margin-top: 46px;
  border-radius: 22px 22px 0 0;
  padding: 10px 10px 0;
  background: linear-gradient(#2a2d36, #16181f);
  box-shadow: 0 -1px 0 rgba(255,255,255,.12) inset, 0 40px 120px rgba(0,0,0,.6);
}
.mac-screen {
  position: relative;
  height: 480px;
  border-radius: 14px 14px 0 0;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 20% 110%, rgba(255, 191, 77, .55), transparent 60%),
    radial-gradient(90% 80% at 90% 100%, rgba(255, 110, 140, .45), transparent 55%),
    linear-gradient(180deg, #4b5a8a 0%, #9a7ea0 55%, #e7b98f 100%);
}
.menubar {
  position: absolute; inset: 0 0 auto 0; height: 30px;
  display: flex; align-items: center; gap: 18px; padding: 0 16px;
  font-size: 13px; color: rgba(255,255,255,.92);
  background: rgba(255,255,255,.16);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
.menubar .apple { width: 13px; height: 15px; background: rgba(255,255,255,.92);
  -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M16.4 12.6c0-2.6 2.1-3.8 2.2-3.9-1.2-1.8-3.1-2-3.7-2-1.6-.2-3.1.9-3.9.9-.8 0-2-.9-3.4-.9-1.7 0-3.3 1-4.2 2.6-1.8 3.1-.5 7.7 1.3 10.2.9 1.2 1.9 2.6 3.2 2.6 1.3-.1 1.8-.8 3.3-.8 1.6 0 2 .8 3.4.8 1.4 0 2.3-1.3 3.1-2.5 1-1.4 1.4-2.8 1.4-2.9 0 0-2.7-1-2.7-4.1zM13.9 5c.7-.9 1.2-2 1.1-3.2-1 0-2.3.7-3 1.6-.7.8-1.3 2-1.1 3.1 1.2.1 2.3-.6 3-1.5z"/></svg>') center / contain no-repeat;
          mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M16.4 12.6c0-2.6 2.1-3.8 2.2-3.9-1.2-1.8-3.1-2-3.7-2-1.6-.2-3.1.9-3.9.9-.8 0-2-.9-3.4-.9-1.7 0-3.3 1-4.2 2.6-1.8 3.1-.5 7.7 1.3 10.2.9 1.2 1.9 2.6 3.2 2.6 1.3-.1 1.8-.8 3.3-.8 1.6 0 2 .8 3.4.8 1.4 0 2.3-1.3 3.1-2.5 1-1.4 1.4-2.8 1.4-2.9 0 0-2.7-1-2.7-4.1zM13.9 5c.7-.9 1.2-2 1.1-3.2-1 0-2.3.7-3 1.6-.7.8-1.3 2-1.1 3.1 1.2.1 2.3-.6 3-1.5z"/></svg>') center / contain no-repeat; }
.menubar-right { margin-left: auto; }
.hint {
  position: absolute; left: 50%; top: 52px; transform: translateX(-50%);
  font-size: 12.5px; color: rgba(255,255,255,.8); text-shadow: 0 1px 6px rgba(0,0,0,.4);
  transition: opacity .4s; pointer-events: none;
}
.mac.touched .hint { opacity: 0; }

/* 岛本体：宽高随状态变化，弹簧感的过渡 */
.island {
  --w: 300px; --h: 30px; --r: 12px;
  position: absolute; left: 50%; top: 0; z-index: 3;
  width: var(--w); height: var(--h);
  transform: translateX(-50%);
  background: #000;
  border-radius: 0 0 var(--r) var(--r);
  transition: width .55s cubic-bezier(.34, 1.36, .5, 1), height .55s cubic-bezier(.34, 1.36, .5, 1), border-radius .45s ease;
  cursor: default;
  box-shadow: 0 10px 30px rgba(0,0,0,0);
}
/* 顶部两侧的内凹小耳朵，和硬件刘海一样 */
.island::before, .island::after {
  content: ""; position: absolute; top: 0; width: 10px; height: 10px;
  background: radial-gradient(circle at 0 100%, transparent 9.5px, #000 10px);
}
.island::before { left: -10px; background: radial-gradient(circle at 0 100%, transparent 9.5px, #000 10px); }
.island::after { right: -10px; background: radial-gradient(circle at 100% 100%, transparent 9.5px, #000 10px); }
.island[data-state="toast"] { --w: 440px; --h: 92px; --r: 24px; box-shadow: 0 14px 40px rgba(0,0,0,.35); }
.island[data-state="panel"] { --w: min(700px, 94%); --h: 430px; --r: 28px; box-shadow: 0 24px 60px rgba(0,0,0,.55); }

.island > .wings, .island > .toast, .island > .panel {
  position: absolute; inset: 0; opacity: 0; pointer-events: none;
  transition: opacity .25s ease;
}
.island[data-state="collapsed"] > .wings,
.island[data-state="toast"] > .toast,
.island[data-state="panel"] > .panel { opacity: 1; pointer-events: auto; transition: opacity .3s ease .18s; }

.wings { display: flex; align-items: center; justify-content: space-between; padding: 0 12px; font-size: 13px; }
.wing-left, .wing-right { display: flex; align-items: center; gap: 6px; font-variant-numeric: tabular-nums; }
.wing-right b { color: var(--mint); }
.ring { width: 17px; height: 17px; transform: rotate(-90deg); }
.ring-track { fill: none; stroke: rgba(255,255,255,.14); stroke-width: 2.6; }
.ring-fill { fill: none; stroke: var(--mint); stroke-width: 2.6; stroke-linecap: round; stroke-dasharray: 47.1; stroke-dashoffset: 28; transition: stroke-dashoffset .8s ease; }

.toast { display: flex; align-items: center; gap: 14px; padding: 36px 22px 10px; }
.toast-title { font-weight: 700; font-size: 15px; }
.toast-sub { color: var(--sec); font-size: 12.5px; }

.panel { padding: 7px 16px 14px; overflow: hidden; }
.panel-head { display: flex; align-items: center; gap: 7px; height: 26px; font-size: 13px; margin-bottom: 10px; }
.chip { font-size: 11.5px; font-weight: 700; font-variant-numeric: tabular-nums; font-style: normal; }
.chip i { font-style: normal; }
.chip.small { font-size: 10.5px; padding: 1px 6px; border-radius: 999px; background: rgba(255,255,255,.06); }
.mint { color: var(--mint); } .amber { color: var(--amber); } .cyan { color: var(--cyan); }
.coral { color: var(--coral); } .violet { color: var(--violet); }
.muted { color: var(--ter); } .mono { font-family: var(--mono); font-size: 10.5px; }
.card {
  border-radius: 15px; padding: 10px 12px; margin-bottom: 8px;
  background: linear-gradient(rgba(255,255,255,.075), rgba(255,255,255,.035));
  border: 0.6px solid rgba(255,255,255,.1);
}
.card-head { display: flex; align-items: center; gap: 7px; font-size: 12.5px; margin-bottom: 6px; }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 6px var(--mint); }
.badge { font-style: normal; font-size: 8.5px; font-weight: 800; letter-spacing: .6px; padding: 2px 6px; border-radius: 999px; }
.badge.violet { background: rgba(168,140,255,.14); }
.badge.cyan { background: rgba(92,194,255,.14); }
.job { display: flex; gap: 10px; align-items: center; padding: 4px 0; }
.ico { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-style: normal; font-size: 12px; color: var(--mint); background: rgba(91,230,181,.15); flex: none; }
.ico.violet { color: var(--violet); background: rgba(168,140,255,.15); }
.job-main { flex: 1; min-width: 0; }
.job-top { display: flex; align-items: baseline; gap: 6px; font-size: 12px; }
.job-top b { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.job-top .right { margin-left: auto; font-size: 11px; font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.job-sub { font-size: 10.5px; color: var(--ter); text-align: right; margin-top: -2px; font-variant-numeric: tabular-nums; }
.bar { height: 4px; border-radius: 4px; background: var(--track); overflow: hidden; display: flex; gap: 1px; margin: 5px 0 3px; width: 66%; }
.bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--mint), var(--cyan)); border-radius: 4px; transition: width .8s ease; }
.bar.time > i { background: rgba(255,255,255,.35); }
.bar.seg > i { border-radius: 0; }
.bar .s-done { background: var(--mint); } .bar .s-fail { background: var(--coral); } .bar .s-run { background: rgba(92,194,255,.55); }

/* ---------------------------------------------------------------- 数字条 */
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  max-width: var(--max); margin: 0 auto; padding: 48px 16px 16px;
}
.stats div {
  text-align: center; padding: 22px 12px; border-radius: var(--radius);
  background: var(--card-2); border: 1px solid var(--line); color: var(--sec); font-size: 14px;
}
.stats b { display: block; font-size: 34px; color: var(--text); letter-spacing: -.5px;
  background: linear-gradient(135deg, var(--mint), #7CCBFF); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------------------------------------------------------------- 通用分区 */
.section { max-width: var(--max); margin: 0 auto; padding: 96px 16px 24px; }
.section h2 { text-align: center; font-size: clamp(28px, 4.2vw, 42px); line-height: 1.2; margin: 0 0 12px; letter-spacing: -.3px; }
.section-lead { text-align: center; color: var(--sec); margin: 0 auto 48px; max-width: 680px; }

.feature {
  display: grid; grid-template-columns: 1fr 1.25fr; gap: 48px; align-items: center;
  margin-bottom: 96px;
}
.feature.flip .feature-text { order: 2; }
.eyebrow { font-family: var(--mono); color: var(--mint); font-size: 13px; letter-spacing: 1px; }
.feature h3 { font-size: clamp(22px, 2.6vw, 28px); margin: 6px 0 12px; line-height: 1.3; }
.feature p { color: var(--sec); margin: 0 0 14px; }
.ticks { list-style: none; padding: 0; margin: 0; color: var(--sec); font-size: 14.5px; }
.ticks li { padding-left: 22px; position: relative; margin: 6px 0; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 8px; height: 8px; border-radius: 2px; background: var(--mint); box-shadow: 0 0 8px rgba(91,230,181,.6); }

.shot { margin: 0; border-radius: var(--radius); overflow: hidden; background: var(--bg-2); border: 1px solid var(--line); box-shadow: 0 30px 80px rgba(0,0,0,.45); }
.shot img { width: 100%; height: auto; }
.shot.stack { display: grid; gap: 1px; background: var(--line); }
.shot figcaption { padding: 10px 14px; font-size: 13.5px; color: var(--sec); background: var(--bg-2); }

/* 计算软件 */
.app-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-bottom: 40px; }
.app-card {
  padding: 18px 16px; border-radius: var(--radius); background: var(--card-2); border: 1px solid var(--line);
  transition: transform .25s, border-color .25s;
}
.app-card:hover { transform: translateY(-3px); border-color: rgba(91,230,181,.4); }
.app-card b { display: block; font-size: 17px; }
.app-card code { display: block; font-size: 11.5px; color: var(--mint); margin: 6px 0 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-card p { margin: 0; font-size: 13px; color: var(--sec); line-height: 1.5; }
.app-card.custom { border-style: dashed; }
.shot-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: stretch; }
.shot-pair .shot { display: flex; flex-direction: column; }
.shot-pair .shot img { height: 400px; object-fit: cover; object-position: top center; }
.shot-pair .shot img.crop-bottom { object-position: bottom center; }

/* Tako */
.tako-section { text-align: center; }
.moods { display: flex; justify-content: center; gap: clamp(16px, 5vw, 48px); flex-wrap: wrap; }
.moods figure { margin: 0; display: grid; justify-items: center; gap: 8px; color: var(--ter); font-size: 13px; }
canvas.tako { image-rendering: pixelated; }

/* 视频 */
.video { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); box-shadow: 0 30px 80px rgba(0,0,0,.5); background: #000; aspect-ratio: 16 / 9; }
.video video { width: 100%; height: 100%; display: block; }
/* 手册里的视频教程：章节跳转 */
.chapters { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 12px; }
.chapters button { font: inherit; font-size: 13.5px; color: var(--sec); text-align: left; cursor: pointer; background: var(--card-2); border: 1px solid var(--line); border-radius: 10px; padding: 8px 11px; display: flex; gap: 8px; align-items: baseline; transition: border-color .2s, color .2s; }
.chapters button b { font-family: var(--mono); font-weight: 600; font-size: 12px; color: var(--mint); }
.chapters button:hover, .chapters button.active { color: var(--text); border-color: rgba(91,230,181,.5); }
@media (max-width: 640px) { .chapters { grid-template-columns: repeat(2, 1fr); } }

/* 隐私 */
.privacy-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.privacy-grid > div { padding: 24px; border-radius: var(--radius); background: var(--card-2); border: 1px solid var(--line); }
.privacy-grid h3 { margin: 0 0 8px; font-size: 18px; }
.privacy-grid p { margin: 0; color: var(--sec); font-size: 14.5px; }

/* 下载 */
.download { text-align: center; }
.download .tako.big { display: block; margin: 0 auto 8px; }
.first-open { max-width: 640px; margin: 28px auto 0; text-align: left; color: var(--sec); font-size: 14.5px; }
.first-open summary { cursor: pointer; text-align: center; color: var(--ter); }
.first-open ul { padding-left: 20px; } .first-open li { margin: 6px 0; }
.first-open pre { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; overflow-x: auto; font-size: 13px; color: var(--text); }

/* 开源 */
.oss-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.oss-card {
  display: grid; gap: 6px; padding: 24px; border-radius: var(--radius);
  background: var(--card-2); border: 1px solid var(--line); transition: transform .25s, border-color .25s;
}
.oss-card:hover { transform: translateY(-3px); border-color: rgba(91,230,181,.4); }
.oss-card svg { width: 26px; height: 26px; color: var(--text); }
.oss-card b { font-size: 18px; }
.oss-card span { color: var(--sec); font-size: 14.5px; }
pre.build { display: inline-block; text-align: left; margin: 6px auto 0; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; font-size: 13px; color: var(--sec); max-width: 100%; overflow-x: auto; }

/* FAQ */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-list details { border-bottom: 1px solid var(--line); padding: 16px 4px; }
.faq-list summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq-list summary::after { content: "+"; color: var(--ter); font-weight: 400; transition: transform .2s; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list p { color: var(--sec); margin: 10px 0 0; font-size: 15px; }

.footer {
  display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap;
  padding: 56px 16px 48px; color: var(--sec); font-size: 13.5px;
}
/* 访问量统计（不蒜子）：脚本加载成功后才把两个 container 设为显示，被拦截时什么都不显示。 */
.site-stats { color: var(--ter); font-variant-numeric: tabular-nums; }
#busuanzi_container_site_pv, #busuanzi_container_site_uv { display: none; }
.site-stats .sep { margin: 0 8px; }

/* 滚动出现 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .8, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .hero-tako { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .island, .island * { transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ---------------------------------------------------------------- 窄屏 */
@media (max-width: 1000px) { .nav-links { display: none; } }
@media (max-width: 900px) {
  .feature, .feature.flip { grid-template-columns: 1fr; gap: 24px; margin-bottom: 72px; }
  .feature.flip .feature-text { order: 0; }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .app-card.custom { grid-column: span 2; }
  .shot-pair, .privacy-grid, .oss-grid { grid-template-columns: 1fr; }
  .shot-pair .shot img { height: auto; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .gh-link span { display: none; }
  .stats { grid-template-columns: 1fr; }
  .mac { padding: 6px 6px 0; border-radius: 14px 14px 0 0; }
  .mac-screen { height: 420px; }
  .menubar > span:not(.apple):not(.menubar-right) { display: none; }
  .island { --w: 230px; }
  .island[data-state="toast"] { --w: 92%; }
  .island[data-state="panel"] { --w: 96%; --h: 400px; }
  .job-sub { display: none; }
  .bar { width: 100%; }
}

/* ---------------------------------------------------------------- 手册 / 功能介绍（子页面） */
.nav-links a.current { color: var(--text); }
.doc-hero { max-width: var(--max); margin: 0 auto; padding: 104px 16px 8px; display: flex; align-items: center; gap: 18px; }
.doc-hero h1 { margin: 0; font-size: clamp(30px, 4.6vw, 44px); line-height: 1.15; letter-spacing: -.4px; }
.doc-hero p { margin: 6px 0 0; color: var(--sec); }
.doc-tabs { max-width: var(--max); margin: 18px auto 0; padding: 0 16px; display: flex; gap: 8px; flex-wrap: wrap; }
.doc-tabs a { padding: 7px 16px; border-radius: 999px; font-size: 14px; color: var(--sec); background: var(--card-2); border: 1px solid var(--line); }
.doc-tabs a:hover { color: var(--text); }
.doc-tabs a.active { color: #04140e; background: var(--mint); border-color: var(--mint); font-weight: 600; }

.docs { max-width: var(--max); margin: 0 auto; padding: 28px 16px 40px; display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; }
.toc { position: sticky; top: 84px; align-self: start; max-height: calc(100vh - 100px); overflow-y: auto; font-size: 14px; }
.toc b { display: block; color: var(--ter); font-size: 12px; letter-spacing: .8px; text-transform: uppercase; margin: 0 0 8px; }
.toc a { display: block; padding: 5px 10px; border-left: 2px solid var(--line); color: var(--sec); }
.toc a:hover { color: var(--text); }
.toc a.active { color: var(--mint); border-left-color: var(--mint); }
.toc a.sub { padding-left: 22px; font-size: 13px; }

.doc { min-width: 0; }
.doc section { scroll-margin-top: 84px; padding-bottom: 28px; }
.doc h2 { font-size: clamp(24px, 3vw, 30px); margin: 18px 0 12px; letter-spacing: -.2px; }
.doc h3 { font-size: 19px; margin: 26px 0 8px; scroll-margin-top: 84px; }
.doc p, .doc li { color: var(--sec); font-size: 15.5px; }
.doc p b, .doc li b { color: var(--text); font-weight: 600; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc code { font-size: 13.5px; color: var(--mint); background: rgba(91,230,181,.08); padding: 1px 6px; border-radius: 6px; }
.doc pre { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; overflow-x: auto; font-size: 13.5px; color: var(--text); }
.doc pre code { background: none; padding: 0; color: inherit; }
.doc kbd { font-family: var(--font); font-size: 12.5px; padding: 1px 7px; border-radius: 6px; background: var(--card); border: 1px solid var(--line); border-bottom-width: 2px; color: var(--text); }
.doc .shot { margin: 16px 0 8px; box-shadow: 0 18px 50px rgba(0,0,0,.4); }
.doc .shot.narrow { max-width: 560px; }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14.5px; }
.doc th, .doc td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { color: var(--ter); font-weight: 600; font-size: 13px; }
.doc td { color: var(--sec); }
.doc td:first-child { color: var(--text); white-space: nowrap; }

.callout { border-radius: 14px; padding: 14px 16px; margin: 14px 0; background: var(--card-2); border: 1px solid var(--line); border-left: 3px solid var(--cyan); }
.callout.tip { border-left-color: var(--mint); }
.callout.warn { border-left-color: var(--amber); }
.callout p { margin: 0; font-size: 14.5px; }
.callout p + p { margin-top: 6px; }

.platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 16px 0; }
.platform { padding: 20px; border-radius: var(--radius); background: var(--card-2); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 6px; }
.platform h3 { margin: 0; display: flex; align-items: center; gap: 8px; font-size: 18px; }
.platform h3 svg { width: 20px; height: 20px; }
.platform .req { color: var(--ter); font-size: 13px; }
.platform ol { margin: 6px 0 0; padding-left: 20px; }
.platform li { font-size: 14px; }
.platform .btn { margin-top: auto; align-self: flex-start; }

.steps { counter-reset: step; list-style: none; padding: 0; }
.steps > li { counter-increment: step; position: relative; padding-left: 40px; margin: 14px 0; }
.steps > li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-size: 13px; font-weight: 700; color: #04140e; background: var(--mint); }

.feat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 14px 0; }
.feat { padding: 18px; border-radius: 16px; background: var(--card-2); border: 1px solid var(--line); }
.feat b { display: block; color: var(--text); margin-bottom: 4px; }
.feat p { margin: 0; font-size: 14.5px; }
.pill { display: inline-block; font-size: 11.5px; font-weight: 700; padding: 1px 8px; border-radius: 999px; margin-left: 6px; vertical-align: 2px; }
.pill.mac { color: #d0d4dc; background: rgba(255,255,255,.08); }
.pill.win { color: var(--cyan); background: rgba(92,194,255,.12); }

.doc-next { display: flex; justify-content: space-between; gap: 12px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.doc-next a { color: var(--cyan); }

/* 首页：三个平台的下载 */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; max-width: 900px; margin: 0 auto 8px; text-align: left; }
.dl-card { display: flex; flex-direction: column; gap: 4px; padding: 20px; border-radius: var(--radius); background: var(--card-2); border: 1px solid var(--line); transition: transform .25s, border-color .25s; }
.dl-card:hover { transform: translateY(-3px); border-color: rgba(91,230,181,.45); }
.dl-card b { font-size: 18px; display: flex; align-items: center; gap: 8px; }
.dl-card b svg { width: 20px; height: 20px; }
.dl-card span { color: var(--sec); font-size: 13.5px; }
.dl-card em { font-style: normal; color: var(--mint); font-size: 14px; font-weight: 600; margin-top: 8px; }

@media (max-width: 900px) {
  .docs { grid-template-columns: 1fr; gap: 8px; }
  .toc { position: static; max-height: none; display: none; }
  .platforms, .dl-grid, .feat-grid { grid-template-columns: 1fr; }
}
.fine a, .doc a:not(.btn) { color: var(--cyan); }
.fine a:hover, .doc a:not(.btn):hover { text-decoration: underline; }
.doc p code, .doc li code, .doc td code, .platform code { overflow-wrap: anywhere; }
@media (max-width: 900px) {
  .doc table { display: block; overflow-x: auto; }
  .doc td:first-child { white-space: normal; }
  .doc-hero { padding-top: 88px; }
}

/* ---------------------------------------------------------------- 下载：按系统推荐 + ▾ 选择其他平台 */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
/* 一个整体的胶囊：渐变和阴影画在外层，左右两半透明，中间一道浅色短分隔线，悬停时只给那一半加一层浅色。 */
.dl-split {
  position: relative; display: inline-flex; align-items: stretch; border-radius: 999px;
  background: linear-gradient(135deg, var(--mint), #7CCBFF);
  box-shadow: 0 8px 30px rgba(91, 230, 181, .28); transition: box-shadow .2s, transform .15s;
}
.dl-split:hover { box-shadow: 0 10px 40px rgba(91, 230, 181, .45); transform: translateY(-1px); }
.dl-split .btn-primary { background: transparent; box-shadow: none; transform: none; }
.dl-split .btn-primary:hover { background: rgba(255, 255, 255, .16); box-shadow: none; transform: none; }
.dl-split .dl-main { border-radius: 999px 0 0 999px; padding-right: 16px; }
.dl-split .dl-toggle {
  position: relative; border: 0; cursor: pointer; font: inherit; color: #04140e;
  border-radius: 0 999px 999px 0; padding: 12px 16px 12px 13px;
}
.dl-split .dl-toggle::before {
  content: ""; position: absolute; left: 0; top: 28%; bottom: 28%; width: 1px; background: rgba(4, 20, 14, .18);
}
.dl-split .dl-toggle svg { transition: transform .2s; }
.dl-split .dl-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.dl-icon { display: inline-flex; }
.dl-menu {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%); z-index: 30;
  width: min(340px, calc(100vw - 32px)); padding: 6px;
  background: rgba(16, 20, 32, .97); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, .55); text-align: left; backdrop-filter: blur(14px);
}
.dl-item { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 11px; color: var(--text); }
.dl-item:hover, .dl-item:focus-visible { background: rgba(255, 255, 255, .07); outline: none; }
.dl-item > svg { width: 20px; height: 20px; flex: none; color: var(--sec); }
.dl-item.current > svg { color: var(--mint); }
.dl-item b { display: flex; align-items: center; gap: 8px; font-size: 15px; }
.dl-item small { display: block; color: var(--sec); font-size: 12.5px; margin-top: 1px; }
.dl-item.dl-all { justify-content: center; color: var(--sec); font-size: 13px; border-top: 1px solid var(--line); border-radius: 0 0 11px 11px; margin-top: 4px; }
.dl-rec {
  font-style: normal; font-size: 11px; font-weight: 700; letter-spacing: .02em;
  color: #04140e; background: var(--mint); border-radius: 999px; padding: 1px 8px;
}
.dl-others { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; color: var(--sec); font-size: 13.5px; margin-top: 16px; }
.dl-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px;
  color: var(--text); background: var(--card); border: 1px solid var(--line); font-size: 13px; transition: background .2s, border-color .2s;
}
.dl-chip svg { width: 14px; height: 14px; }
.dl-chip:hover { background: rgba(255, 255, 255, .1); border-color: rgba(91, 230, 181, .45); }
.dl-chip.ghost { background: transparent; color: var(--sec); }