/* 官网样式(2026-09-21 重做)。零外部依赖、零外链字体。
   版式思路:浅色底 + 居中大字首屏 + "一屏只讲一件事"的整屏场景区(大圆角色块) + 深色圆角功能岛;字少而大、留白大。
   示意图全部 CSS 绘制;日后换真实截图只需替换 .hero-stage / .scene-panel 的内部结构。 */
:root {
  --bg: #F7F8FA;
  --surface: #FFFFFF;
  --ink: #0B0F19;
  --mid: #4A5568;
  --lo: #8A94A6;
  --line: #E6E9EF;
  --accent: #0FA968;            /* 品牌青绿(沿用产品内的 #3DDC97 调深一档,保证浅底对比度) */
  --accent-soft: #E3F7EE;
  --warn: #C2610C;
  --warn-soft: #FFF1E0;
  --blue: #2563EB;
  --violet: #7C3AED;
  --teal: #0D9488;
  --dark: #15171E;              /* 功能岛底色 */
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.7;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.18; letter-spacing: -.02em; text-wrap: balance; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; text-align: left; }
code { font-family: var(--mono); font-size: .9em; background: #EEF1F5; padding: 2px 7px; border-radius: 6px; }
svg { width: 1.15em; height: 1.15em; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.wrap { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 32px; }
.wrap.narrow { max-width: 820px; }

/* ── 顶栏 ── */
.nav { position: sticky; top: 0; z-index: 30; background: rgba(255, 255, 255, .82); backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav-in { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.brand em { font-style: normal; font-weight: 600; margin-left: 5px; }
.brand-mark { width: 24px; height: 24px; border-radius: 8px; background: linear-gradient(135deg, #12C47A, #22B8E6); }
.nav-links { display: flex; gap: 30px; margin-left: 12px; }
.nav-links a { color: var(--mid); font-size: 15px; transition: color .12s; }
.nav-links a:hover { color: var(--ink); }
.nav .btn { margin-left: auto; }

/* ── 按钮 ── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; height: 46px; padding: 0 22px; border-radius: 12px; border: 1px solid transparent; font: 600 15px/1 var(--sans); white-space: nowrap; transition: transform .14s, box-shadow .2s, background .14s, border-color .14s; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: none; }
.btn-sm { height: 36px; padding: 0 18px; font-size: 14px; border-radius: 10px; }
.btn-xl { height: 62px; padding: 0 40px; font-size: 19px; border-radius: 14px; }
.btn-xl svg { width: 22px; height: 22px; }
.btn-block { width: 100%; }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #1B2233; }
.btn-line { border-color: #CBD2DC; color: var(--mid); background: transparent; }
.btn-line:hover { border-color: var(--ink); color: var(--ink); }
/* 主按钮底部的彩色光晕(一条渐变色带模糊后垫在按钮下方) */
.btn-glow { position: relative; isolation: isolate; }
.btn-glow::after { content: ""; position: absolute; z-index: -1; left: 8%; right: 8%; bottom: -6px; height: 18px; border-radius: 50%; background: linear-gradient(90deg, #22B8E6, #12C47A, #FACC15, #F97316); filter: blur(14px); opacity: .75; transition: opacity .2s; }
.btn-glow:hover::after { opacity: 1; }
.btn.is-disabled { background: #E9ECF1; color: var(--lo); border-color: transparent; pointer-events: none; }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 16px; color: var(--ink); }
.link-arrow svg { transition: transform .16s; }
.link-arrow:hover svg { transform: translateX(4px); }

/* ── 首屏 ── */
.hero { position: relative; overflow: hidden; padding: 96px 0 0; text-align: center; background: radial-gradient(900px 420px at 50% -80px, #FFFFFF, transparent 70%); }
.hero h1 { font-size: clamp(40px, 7.2vw, 88px); font-weight: 800; letter-spacing: -.035em; }
.lead { margin-top: 26px; color: var(--mid); font-size: clamp(18px, 2.2vw, 27px); }
.hero-cta { display: flex; flex-direction: column; align-items: center; gap: 22px; margin-top: 52px; }
.hero-meta { margin-top: 20px; min-height: 1.7em; color: var(--lo); font-size: 14px; }
.hero-meta a { color: var(--accent); font-weight: 600; }
.hero-meta a:hover { text-decoration: underline; }
/* 大示意图:宽铺 + 下半截被首屏裁掉,形成"从底部升起"的效果 */
.hero-stage { position: relative; max-width: 1040px; margin: 72px auto -150px; }
.stage-glow { position: absolute; inset: -34px 6% auto; height: 120px; border-radius: 50%; background: linear-gradient(90deg, #22B8E6, #12C47A, #FACC15, #F97316, #7C3AED); filter: blur(46px); opacity: .42; }

/* 浏览器外框(地址栏点明"在网页里")→ 里面是一眼能认出的 Windows 桌面(点明"另一台电脑") */
.browser { position: relative; border: 8px solid #1C1F27; border-bottom: 0; border-radius: 22px 22px 0 0; overflow: hidden; background: #1C1F27; box-shadow: 0 40px 100px rgba(11, 15, 25, .22); text-align: left; }
.browser-bar { display: flex; align-items: center; gap: 8px; height: 44px; padding: 0 16px; background: #262A34; }
.browser-bar > i { width: 12px; height: 12px; border-radius: 50%; background: #3A404D; }
.addr { display: flex; align-items: center; gap: 8px; flex: 1; height: 28px; margin-left: 14px; padding: 0 14px; border-radius: 9px; background: #15171E; color: #9AA4B8; font-size: 13px; }
.addr svg { width: 13px; height: 13px; color: #3DDC97; }
.remote { position: relative; }
.remote-status { position: absolute; z-index: 3; top: 14px; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: 8px; padding: 5px 14px; border-radius: 999px; background: rgba(10, 12, 18, .78); border: 1px solid rgba(255, 255, 255, .1); color: #E8ECF4; font-size: 13px; white-space: nowrap; backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #3DDC97; box-shadow: 0 0 10px #3DDC97; }
.desk { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: radial-gradient(60% 70% at 72% 58%, rgba(120, 190, 255, .55), transparent 70%), radial-gradient(50% 60% at 40% 80%, rgba(80, 140, 255, .45), transparent 70%), linear-gradient(140deg, #0A2A66 0%, #1250A8 50%, #2D7FE0 100%); }
.desk-icons { position: absolute; top: 22px; left: 20px; display: grid; gap: 18px; }
.desk-icons span { display: grid; justify-items: center; gap: 6px; width: 76px; color: #fff; font-size: 12.5px; text-shadow: 0 1px 3px rgba(0, 0, 0, .7); }
.di { width: 40px; height: 34px; border-radius: 5px; }
.di-pc { background: linear-gradient(#CFE6FF, #7DB8F5); border-bottom: 5px solid #3B6FB5; }
.di-bin { width: 30px; border-radius: 4px 4px 8px 8px; background: linear-gradient(#E9EEF5, #A9B6C8); }
.di-doc { background: linear-gradient(#FFD978, #F2B233); border-radius: 4px 8px 5px 5px; }
.win { position: absolute; left: 24%; top: 16%; width: 56%; height: 50%; display: flex; flex-direction: column; border-radius: 10px; overflow: hidden; background: #F4F6FA; box-shadow: 0 24px 60px rgba(0, 0, 0, .45); }
.win-bar { display: flex; align-items: center; justify-content: space-between; height: 34px; padding-left: 14px; background: #E6EAF1; color: #2A3140; font-size: 13px; }
.win-bar em { display: flex; height: 100%; }
.win-bar b { display: block; position: relative; width: 40px; height: 100%; }
.win-bar b::after, .win-bar b.x::before { content: ""; position: absolute; left: 50%; top: 50%; width: 11px; height: 1.5px; margin: -1px 0 0 -5.5px; background: #5A6478; }
.win-bar b.x { background: #E5484D; }
.win-bar b.x::after { background: #fff; transform: rotate(45deg); }
.win-bar b.x::before { background: #fff; transform: rotate(-45deg); }
.win-body { flex: 1; display: flex; min-height: 0; }
.win-side { width: 26%; padding: 14px 12px; display: grid; gap: 11px; align-content: start; background: #EBEEF4; }
.win-side u { display: block; height: 9px; border-radius: 5px; background: #C9D0DC; }
.win-side u:first-child { background: #7DB8F5; }
.win-files { flex: 1; padding: 18px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-content: start; }
.win-files s { display: block; aspect-ratio: 4 / 3; border-radius: 5px 9px 6px 6px; background: linear-gradient(#FFD978, #F2B233); }
.win-files s:nth-child(n+4) { background: linear-gradient(#DDE6F3, #B5C4DA); border-radius: 5px; }
.taskbar { position: absolute; left: 0; right: 0; bottom: 0; height: 42px; display: flex; align-items: center; justify-content: center; gap: 13px; background: rgba(16, 24, 44, .78); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.taskbar i { position: relative; width: 22px; height: 22px; border-radius: 5px; background: rgba(255, 255, 255, .26); }
.taskbar i.on { background: #FFD978; }
.taskbar i.on::after { content: ""; position: absolute; left: 6px; right: 6px; bottom: -7px; height: 3px; border-radius: 2px; background: #7DB8F5; }
.start { display: grid; grid-template-columns: repeat(2, 10px); gap: 2px; }
.start b { width: 10px; height: 10px; border-radius: 1.5px; background: #5DB2FF; }
.taskbar time { position: absolute; right: 18px; color: #fff; font: 500 13px/1 var(--sans); }
.cursor { position: absolute; z-index: 2; left: 58%; top: 40%; width: 26px; height: 26px; fill: #fff; stroke: #10151F; stroke-width: 1.4; filter: drop-shadow(0 2px 3px rgba(0, 0, 0, .5)); animation: cur 8s ease-in-out infinite; }
@keyframes cur { 0%, 100% { left: 58%; top: 40%; } 30% { left: 40%; top: 32%; } 60% { left: 66%; top: 52%; } 80% { left: 50%; top: 24%; } }

/* ── 应用场景:整屏、左右交替 ── */
.scene { padding: 120px 0; background: var(--surface); }
.scene + .scene { padding-top: 0; }
.scene-in { display: grid; grid-template-columns: 1.55fr 1fr; gap: 80px; align-items: center; }
.scene-flip .scene-panel { order: 2; }
.scene-flip .scene-in { grid-template-columns: 1fr 1.55fr; }
.scene-panel { position: relative; aspect-ratio: 3 / 2; border-radius: 32px; overflow: hidden; }
.scene-panel::before, .scene-panel::after { content: ""; position: absolute; border-radius: 50%; background: rgba(255, 255, 255, .1); }
.scene-panel::before { width: 46%; aspect-ratio: 1; left: -14%; top: -18%; }
.scene-panel::after { width: 38%; aspect-ratio: 1; right: -8%; bottom: -16%; }
.panel-blue { background: linear-gradient(150deg, #3B82F6, #1D4ED8); }
.panel-violet { background: linear-gradient(150deg, #8B5CF6, #5B21B6); }
.panel-teal { background: linear-gradient(150deg, #14B8A6, #0F766E); }
.scene-tag { display: inline-flex; align-items: center; gap: 10px; font-size: 24px; font-weight: 500; }
.scene-tag svg { width: 28px; height: 28px; }
.tag-blue { color: var(--blue); }
.tag-violet { color: var(--violet); }
.tag-teal { color: var(--teal); }
.scene-copy h2 { margin-top: 18px; font-size: clamp(34px, 4.4vw, 60px); font-weight: 800; letter-spacing: -.03em; }
.checks { margin-top: 40px; display: grid; gap: 14px; }
.checks li { position: relative; padding-left: 34px; color: var(--mid); font-size: 19px; }
.checks li::before { content: ""; position: absolute; left: 4px; top: .42em; width: 13px; height: 7px; border-left: 2px solid var(--ink); border-bottom: 2px solid var(--ink); transform: rotate(-45deg); }

/* 场景示意通用:浮动信息卡 */
.chip { position: absolute; z-index: 2; padding: 12px 16px; border-radius: 14px; background: #fff; color: var(--ink); font-size: 14px; font-weight: 600; box-shadow: 0 16px 40px rgba(11, 15, 25, .25); }
/* 办公:文档窗口 + 传输进度 + 剪贴板 */
.mock-doc { position: absolute; z-index: 1; left: 11%; top: 13%; width: 62%; height: 74%; display: flex; flex-direction: column; border-radius: 12px; overflow: hidden; background: #fff; box-shadow: 0 26px 60px rgba(8, 20, 60, .35); }
.mock-doc-bar { display: flex; gap: 6px; align-items: center; height: 30px; padding: 0 12px; background: #EEF1F6; }
.mock-doc-bar i { width: 9px; height: 9px; border-radius: 50%; background: #C9D0DC; }
.mock-doc-body { flex: 1; padding: 8% 9%; display: grid; gap: 5%; align-content: start; }
.mock-doc-body b { display: block; width: 46%; height: 16px; border-radius: 5px; background: #1F2937; }
.mock-doc-body span { display: block; height: 9px; border-radius: 5px; background: #E2E7EF; }
.mock-doc-body span.short { width: 62%; }
.mock-chart { display: flex; align-items: flex-end; gap: 6%; height: 84px; margin-top: 4%; }
.mock-chart i { flex: 1; border-radius: 5px 5px 0 0; background: #BFD3FF; }
.mock-chart i:nth-child(1) { height: 42%; } .mock-chart i:nth-child(2) { height: 66%; } .mock-chart i:nth-child(3) { height: 52%; background: #3B82F6; } .mock-chart i:nth-child(4) { height: 88%; } .mock-chart i:nth-child(5) { height: 72%; }
.chip-file { right: 7%; top: 20%; width: 34%; min-width: 190px; }
.chip-file strong { display: block; font-size: 13.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chip-file .bar { height: 6px; margin: 10px 0 7px; border-radius: 4px; background: #E6E9EF; overflow: hidden; }
.chip-file .bar i { display: block; width: 68%; height: 100%; border-radius: 4px; background: var(--blue); }
.chip-file small { color: var(--lo); font-weight: 500; font-size: 12px; }
.chip-clip { right: 10%; bottom: 17%; display: flex; align-items: center; gap: 9px; }
.tick { position: relative; width: 20px; height: 20px; border-radius: 50%; background: var(--accent); }
.tick::after { content: ""; position: absolute; left: 6px; top: 6px; width: 8px; height: 4px; border-left: 2px solid #fff; border-bottom: 2px solid #fff; transform: rotate(-45deg); }
/* 游戏:视口 + 准星 + 帧率 + 键位 */
.mock-game { position: absolute; z-index: 1; inset: 12% 9%; border-radius: 14px; overflow: hidden; border: 5px solid #16101F; background: #16101F; box-shadow: 0 26px 60px rgba(30, 8, 70, .45); }
.sky { position: absolute; inset: 0; background: linear-gradient(#1E1B4B 0%, #6D28D9 46%, #F472B6 72%, #FDBA74 100%); }
.hill { position: absolute; left: 0; right: 0; bottom: 0; }
.hill-a { height: 46%; background: #2E1065; clip-path: polygon(0 62%, 16% 34%, 30% 56%, 46% 18%, 62% 50%, 78% 28%, 100% 58%, 100% 100%, 0 100%); }
.hill-b { height: 30%; background: #170A33; clip-path: polygon(0 50%, 22% 22%, 40% 58%, 58% 30%, 80% 60%, 100% 34%, 100% 100%, 0 100%); }
.crosshair { position: absolute; left: 50%; top: 46%; width: 30px; height: 30px; margin: -15px 0 0 -15px; border: 2px solid rgba(255, 255, 255, .9); border-radius: 50%; }
.crosshair::before, .crosshair::after { content: ""; position: absolute; background: rgba(255, 255, 255, .9); }
.crosshair::before { left: 50%; top: -9px; bottom: -9px; width: 2px; margin-left: -1px; }
.crosshair::after { top: 50%; left: -9px; right: -9px; height: 2px; margin-top: -1px; }
.hud { position: absolute; top: 14px; right: 14px; padding: 6px 13px; border-radius: 9px; background: rgba(10, 12, 18, .66); color: #3DDC97; font: 700 14px/1.3 var(--mono); }
.keys { position: absolute; left: 16px; bottom: 16px; display: grid; grid-template-columns: repeat(3, 34px); grid-template-rows: repeat(2, 34px); gap: 5px; }
.keys kbd { display: grid; place-items: center; border-radius: 8px; background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .3); color: #fff; font: 700 13px/1 var(--sans); }
.keys kbd:nth-child(1) { grid-column: 2; background: rgba(255, 255, 255, .92); color: #2E1065; }
.keys kbd:nth-child(2) { grid-column: 1; grid-row: 2; }
.keys kbd:nth-child(3) { grid-column: 2; grid-row: 2; }
.keys kbd:nth-child(4) { grid-column: 3; grid-row: 2; }
/* 运维:多台设备缩略 + 多人查看 */
.mock-grid { position: absolute; z-index: 1; inset: 19% 9% 11%; display: grid; grid-template-columns: repeat(3, 1fr); gap: 5%; }
.mini { position: relative; display: flex; align-items: flex-end; gap: 7px; padding: 9px 11px; border-radius: 11px; border: 3px solid rgba(255, 255, 255, .22); background: linear-gradient(140deg, #0A2A66, #2D7FE0); box-shadow: 0 14px 30px rgba(4, 40, 36, .3); color: #fff; font-size: 12px; font-weight: 600; white-space: nowrap; }
.mini i { width: 8px; height: 8px; margin-bottom: 5px; border-radius: 50%; flex: none; }
.mini i.ok { background: #3DDC97; }
.mini i.idle { background: #94A3B8; }
.mini.is-focus { border-color: #fff; box-shadow: 0 0 0 4px rgba(255, 255, 255, .3), 0 18px 36px rgba(4, 40, 36, .4); }
.mini.is-headless { background: repeating-linear-gradient(135deg, #134E4A 0 10px, #115E59 10px 20px); border-style: dashed; }
/* 浮卡放在右上、紧贴被聚焦的 A-03 上方(原先居中压底会盖住第二排设备名) */
.chip-view { right: 7%; top: 5%; display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.avatars { display: flex; }
.avatars i { width: 22px; height: 22px; margin-left: -7px; border-radius: 50%; border: 2px solid #fff; background: #60A5FA; }
.avatars i:first-child { margin-left: 0; background: #F472B6; }
.avatars i:last-child { background: #FBBF24; }

/* ── 核心能力:深色圆角功能岛 ── */
.island-wrap { padding: 0 28px; background: var(--surface); }
.island { max-width: 1384px; margin: 0 auto; padding: 96px 72px 104px; border-radius: 44px; background: var(--dark); color: #fff; }
.island h2 { text-align: center; font-size: clamp(34px, 4.6vw, 64px); font-weight: 800; letter-spacing: -.03em; }
.island-in { display: grid; grid-template-columns: 1fr 1.35fr; gap: 72px; align-items: center; max-width: 1180px; margin: 80px auto 0; }
.tabs { display: grid; border-left: 1px solid rgba(255, 255, 255, .12); }
.tab { position: relative; padding: 18px 0 18px 26px; color: rgba(255, 255, 255, .36); transition: color .2s; }
.tab::before { content: ""; position: absolute; left: -2px; top: 16px; bottom: 16px; width: 3px; border-radius: 2px; background: #22B8E6; opacity: 0; transition: opacity .2s; }
.tab strong { display: block; font-size: 25px; font-weight: 800; letter-spacing: -.01em; transition: font-size .2s; }
.tab span { display: block; max-height: 0; overflow: hidden; color: rgba(255, 255, 255, .78); font-size: 16px; opacity: 0; transition: max-height .25s, opacity .25s, margin .25s; }
.tab:hover { color: rgba(255, 255, 255, .7); }
.tab.is-active { color: #fff; }
.tab.is-active::before { opacity: 1; }
.tab.is-active strong { font-size: 34px; }
.tab.is-active span { max-height: 4em; margin-top: 8px; opacity: 1; }
.tab-stage { position: relative; aspect-ratio: 16 / 10; border-radius: 28px; overflow: hidden; background: radial-gradient(120% 100% at 80% 0%, #273049, #1B1F2B 60%); border: 1px solid rgba(255, 255, 255, .08); }
.pane { position: absolute; inset: 0; display: grid; place-items: center; align-content: center; gap: 34px; opacity: 0; transform: translateY(10px); transition: opacity .3s, transform .3s; pointer-events: none; }
.pane.is-active { opacity: 1; transform: none; }
.pane p { color: rgba(255, 255, 255, .7); font-size: 18px; letter-spacing: .04em; }
.viz { display: flex; align-items: center; justify-content: center; }
.viz-weak { align-items: flex-end; gap: 14px; height: 130px; }
.viz-weak i { width: 26px; border-radius: 7px; background: #3DDC97; }
.viz-weak i:nth-child(1) { height: 22%; } .viz-weak i:nth-child(2) { height: 40%; } .viz-weak i:nth-child(3) { height: 60%; }
.viz-weak i:nth-child(4) { height: 80%; background: rgba(255, 255, 255, .16); } .viz-weak i:nth-child(5) { height: 100%; background: rgba(255, 255, 255, .16); }
.viz-p2p { gap: 0; }
.node { display: grid; place-items: center; width: 112px; height: 76px; border-radius: 16px; border: 2px solid rgba(255, 255, 255, .28); background: rgba(255, 255, 255, .06); font-size: 15px; font-weight: 600; }
.wire { position: relative; width: 150px; height: 2px; background: rgba(255, 255, 255, .22); }
.wire i { position: absolute; top: -4px; width: 10px; height: 10px; border-radius: 50%; background: #22B8E6; box-shadow: 0 0 14px #22B8E6; animation: flow 2.2s ease-in-out infinite alternate; }
@keyframes flow { from { left: 0; } to { left: calc(100% - 10px); } }
.viz-web { flex-direction: column; width: 300px; border-radius: 14px; overflow: hidden; border: 1px solid rgba(255, 255, 255, .18); }
.vb-bar { display: flex; align-items: center; gap: 6px; width: 100%; height: 32px; padding: 0 12px; background: rgba(255, 255, 255, .1); }
.vb-bar i { width: 9px; height: 9px; border-radius: 50%; background: rgba(255, 255, 255, .3); }
.vb-bar span { flex: 1; height: 14px; margin-left: 8px; border-radius: 7px; background: rgba(255, 255, 255, .14); }
.vb-body { display: grid; place-items: center; width: 100%; height: 120px; background: linear-gradient(140deg, #0A2A66, #2D7FE0); }
.vb-body svg { width: 34px; height: 34px; fill: #fff; stroke: #10151F; stroke-width: 1.2; }
.viz-quality { flex-direction: column; gap: 22px; width: 340px; }
.viz-quality label { display: grid; grid-template-columns: 64px 1fr; align-items: center; gap: 16px; width: 100%; color: rgba(255, 255, 255, .8); font-size: 15px; }
.viz-quality span { height: 8px; border-radius: 4px; background: rgba(255, 255, 255, .14); }
.viz-quality span i { position: relative; display: block; height: 100%; border-radius: 4px; background: #22B8E6; }
.viz-quality span i::after { content: ""; position: absolute; right: -9px; top: -5px; width: 18px; height: 18px; border-radius: 50%; background: #fff; }
.viz-update svg { width: 120px; height: 120px; color: #3DDC97; stroke-width: 1.6; animation: spin 7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── 通用区块 ── */
.sec { padding: 128px 0; background: var(--surface); }
.sec-tint { background: var(--bg); }
.sec-title { text-align: center; font-size: clamp(32px, 4.2vw, 56px); font-weight: 800; letter-spacing: -.03em; }

/* ── 快速开始 ── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 56px; margin-top: 80px; }
.steps li { padding-top: 26px; border-top: 2px solid var(--ink); }
.num { display: block; font: 800 56px/1 var(--sans); letter-spacing: -.04em; color: #D5DAE3; }
.steps h3 { margin-top: 22px; font-size: 25px; font-weight: 800; }
.steps p { margin-top: 10px; color: var(--mid); font-size: 17px; }
.steps a { color: var(--accent); font-weight: 600; }
.steps a:hover { text-decoration: underline; }

/* ── 下载 ── */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 72px; }
.dl { display: flex; flex-direction: column; padding: 34px 32px 32px; border-radius: 24px; border: 1px solid var(--line); background: var(--surface); transition: box-shadow .2s, transform .2s, border-color .2s; }
.dl:hover { transform: translateY(-3px); box-shadow: 0 18px 44px rgba(11, 15, 25, .08); }
.dl .btn { margin-top: auto; } /* 说明文字长短不一,按钮统一沉底对齐 */
.dl-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.dl h3 { font-size: 27px; font-weight: 800; }
.dl.is-recommended { border-color: var(--ink); box-shadow: 0 0 0 1px var(--ink); }
.badge { padding: 4px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 13px; font-weight: 700; white-space: nowrap; }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.dl-os { margin-top: 6px; color: var(--lo); font-size: 14px; }
.dl-desc { margin-top: 20px; color: var(--mid); font-size: 16px; }
.dl-desc strong { color: var(--ink); font-weight: 700; }
.dl-meta { margin: 22px 0 24px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--lo); font-size: 14px; }
.dl-meta b { color: var(--ink); font-family: var(--mono); font-weight: 600; }
/* Win7:不推荐 → 视觉降级(灰底、虚线边、橙色提示、非主色按钮),让人先看到提示再决定 */
.dl-legacy { background: transparent; border-style: dashed; border-color: #CBD2DC; }
.dl-legacy:hover { transform: none; box-shadow: none; }
.dl-legacy h3 { color: var(--mid); }
.dl-legacy .dl-desc strong { color: var(--warn); }
.dl-note { margin: 28px auto 0; max-width: 760px; padding: 13px 18px; border-radius: 12px; background: var(--warn-soft); color: var(--warn); font-size: 15px; text-align: center; }
.dl-tip { margin-top: 32px; text-align: center; color: var(--lo); font-size: 15px; }
.dl-tip strong { color: var(--mid); font-weight: 600; }

/* ── 常见问题 ── */
details { border-bottom: 1px solid var(--line); }
details:first-of-type { margin-top: 64px; border-top: 1px solid var(--line); }
summary { position: relative; padding: 26px 44px 26px 0; cursor: pointer; list-style: none; font-size: 21px; font-weight: 700; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 2px; top: 50%; transform: translateY(-54%); color: var(--lo); font: 300 32px/1 var(--sans); transition: transform .2s, color .14s; }
details[open] summary::after { transform: translateY(-54%) rotate(45deg); color: var(--ink); }
details p { padding: 0 44px 28px 0; color: var(--mid); font-size: 17px; }

/* ── 页脚 ── */
.foot { padding: 80px 0 44px; background: var(--bg); border-top: 1px solid var(--line); }
.foot-in { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.foot-brand p { margin-top: 14px; color: var(--lo); font-size: 14.5px; }
.foot-col { display: grid; gap: 12px; align-content: start; }
.foot-col h4 { margin-bottom: 6px; font-size: 15px; font-weight: 700; letter-spacing: 0; }
.foot-col a { color: var(--mid); font-size: 14.5px; }
.foot-col a:hover { color: var(--ink); }
.foot-legal { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 60px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--lo); font-size: 13.5px; }
.foot-legal a:hover { color: var(--ink); }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 8px; }

/* ── 窄屏 ── */
@media (max-width: 1024px) {
  .scene { padding: 88px 0; }
  .scene-in, .scene-flip .scene-in { grid-template-columns: 1fr; gap: 44px; }
  .scene-flip .scene-panel { order: 0; }
  .island { padding: 72px 36px 80px; border-radius: 32px; }
  .island-in { grid-template-columns: 1fr; gap: 48px; margin-top: 56px; }
  .dl-grid { grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .steps { grid-template-columns: 1fr; gap: 40px; margin-top: 56px; }
  .foot-in { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .nav-links { display: none; }
  .hero { padding-top: 64px; }
  .hero-cta { margin-top: 40px; }
  .btn-xl { width: 100%; height: 56px; font-size: 17px; }
  .hero-stage { margin: 56px auto -60px; }
  .browser { border-width: 5px; border-radius: 14px 14px 0 0; }
  .desk-icons, .taskbar time { display: none; }
  .scene, .sec { padding: 72px 0; }
  .scene-panel { border-radius: 22px; }
  .scene-tag { font-size: 19px; }
  .checks li { font-size: 17px; }
  .chip { font-size: 12.5px; padding: 9px 12px; }
  .chip-file { min-width: 150px; }
  .island-wrap { padding: 0 12px; }
  .island { padding: 56px 22px 60px; border-radius: 26px; }
  .tab strong { font-size: 21px; }
  .tab.is-active strong { font-size: 26px; }
  .viz-quality, .viz-web { width: 78%; }
  .wire { width: 70px; }
  .node { width: 88px; height: 64px; font-size: 13.5px; }
  summary { font-size: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor, .wire i, .viz-update svg { animation: none; }
  .btn, .dl, .pane, .tab, .tab span, .tab strong { transition: none; }
}