/* G123 起始页 · 介绍页样式
   设计令牌与首页 home.css 同源（翠绿强调 + 中性冷灰面 + 玻璃层），所以这一页和 https://g123.cn/
   看起来是同一个产品，而不是两套皮。
   这一页只有暗色一套：2026-10-21 站长点名「不要亮色了，我不喜欢亮色的 UI」，
   所以亮色那半套令牌、[data-theme=dark] 覆盖和右上角的主题开关都删了，别再按双主题改回来。
   --rim 是玻璃板顶边那道内高光的强度：亮色时代它是 .30 的白，压在深色面上会糊成一条白带子。 */
:root {
  color-scheme: dark;
  --acc: #10b981;
  --acc-600: #34d399;
  --acc-ink: #34d399;
  --ink: #f5f5f7;
  --sub: #c9c9d0;
  --faint: #9c9ca6;
  --line: rgba(255, 255, 255, .13);
  --line-2: rgba(255, 255, 255, .07);
  --glass: rgba(28, 28, 31, .74);
  --glass-2: rgba(28, 28, 31, .56);
  --card: rgba(255, 255, 255, .045);
  --card-line: rgba(255, 255, 255, .10);
  --field: rgba(255, 255, 255, .07);
  --hover: rgba(255, 255, 255, .07);
  --rim: rgb(255 255 255 / .09);
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .45);
  --shadow-lg: 0 4px 14px rgba(0, 0, 0, .5), 0 26px 60px rgba(0, 0, 0, .62);
  --shadow-win: 0 4px 18px rgba(0, 0, 0, .55), 0 50px 100px -30px rgba(0, 0, 0, .85);
  --veil: 10 10 12;
  --bg-0: radial-gradient(68% 54% at 84% 2%, rgba(16, 185, 129, .22) 0%, rgba(16, 185, 129, 0) 60%),
          radial-gradient(64% 52% at 4% 92%, rgba(20, 184, 166, .15) 0%, rgba(20, 184, 166, 0) 60%),
          linear-gradient(168deg, #1a1a1c 0%, #141414 52%, #0c0c0e 100%);
  --page: #101012;
  --r1: 10px; --r2: 12px; --r3: 16px; --r4: 20px; --r5: 26px; --r6: 34px;
  --ease: cubic-bezier(.25, .46, .45, .94);
  --spring: cubic-bezier(.22, 1.2, .36, 1);
  --wrap: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0 }
html { height: 100%; scroll-behavior: smooth; -webkit-text-size-adjust: 100% }
body {
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15.5px; line-height: 1.7;
  color: var(--ink); background: var(--page);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: inherit; text-decoration: none }
img, svg { display: block; max-width: 100% }
button, input, select { font: inherit; color: inherit }
ul, ol { list-style: none }
:focus-visible { outline: 2px solid var(--acc-600); outline-offset: 3px; border-radius: 6px }
::selection { background: color-mix(in srgb, var(--acc) 30%, transparent) }

/* ---------- 背景：渐变底 + 两道慢速极光 + 细网格 + 四周压暗 ---------- */
.bg, .aur, .mesh, .vig { position: fixed; inset: 0; pointer-events: none }
.bg { z-index: -4; background: var(--bg-0); }
.aur { z-index: -3; overflow: hidden; opacity: .5 }
.aur i {
  position: absolute; display: block; border-radius: 50%; filter: blur(70px);
  background: radial-gradient(circle at 40% 40%, color-mix(in srgb, var(--acc) 42%, transparent), transparent 68%);
  animation: drift 26s var(--ease) infinite alternate;
}
.aur i:nth-child(1) { width: 46vw; height: 46vw; top: -14vw; right: -8vw }
.aur i:nth-child(2) {
  width: 40vw; height: 40vw; bottom: -12vw; left: -10vw; animation-duration: 34s; animation-delay: -8s;
  background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, .30), transparent 68%);
}
.aur i:nth-child(3) {
  width: 30vw; height: 30vw; top: 42%; left: 46%; animation-duration: 40s; animation-delay: -16s; opacity: .5;
  background: radial-gradient(circle at 50% 50%, rgba(236, 72, 153, .16), transparent 70%);
}
@keyframes drift { from { transform: translate3d(0, 0, 0) scale(1) } to { transform: translate3d(-4vw, 3vw, 0) scale(1.14) } }
.mesh {
  z-index: -2; opacity: .7;
  background-image: linear-gradient(rgb(var(--veil) / .05) 1px, transparent 1px),
                    linear-gradient(90deg, rgb(var(--veil) / .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(72% 60% at 50% 24%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(72% 60% at 50% 24%, #000 0%, transparent 78%);
}
.vig { z-index: -1; background: radial-gradient(128% 90% at 50% 34%, rgba(0, 0, 0, 0) 54%, rgb(var(--veil) / .34) 100%) }
@media (prefers-reduced-motion: reduce) {
  .aur i { animation: none }
  html { scroll-behavior: auto }
  * { transition-duration: .01ms !important; animation-duration: .01ms !important }
}

.wrap { width: min(var(--wrap), 100% - 40px); margin-inline: auto }
.sec { position: relative; padding: 60px 0 }
.sec + .sec { padding-top: 0 }
/* 所有网格轨道都用 minmax(0,1fr)：1fr 的最小值是内容的 min-content，
   窄屏下会被一行不肯断的文本顶宽，整页就横向溢出了 */
.txt, .card, .stat, .qa, .vitem, .flist li b, .flist li span { min-width: 0 }
.txt p, .flist li span, .qa .a p, .card p, .vitem span { overflow-wrap: anywhere }

/* ---------- 顶部导航：一颗浮起来的玻璃胶囊 ---------- */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 60; display: flex; justify-content: center; padding: 14px 16px 0; transition: padding .3s var(--ease) }
.nav-in {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px;
  width: min(var(--wrap), 100%);
  padding: 7px; border-radius: 999px;
  background: color-mix(in srgb, var(--glass) 76%, transparent);
  border: 1px solid var(--card-line);
  box-shadow: var(--shadow), inset 0 1px 0 var(--rim);
  backdrop-filter: blur(26px) saturate(1.8); -webkit-backdrop-filter: blur(26px) saturate(1.8);
  transition: box-shadow .3s var(--ease), background .3s var(--ease)
}
.nav.stuck .nav-in { box-shadow: var(--shadow-lg), inset 0 1px 0 var(--rim) }
/* 三档：左边品牌，中间导航，右边只剩一个进站的按钮（原来品牌旁边那颗主题开关已随亮色一起删掉）。
   中间用 auto 轨道居中，两边各占 1fr，导航永远是那条胶囊的正中 */
.nav-z { display: flex; align-items: center; gap: 8px; min-width: 0; padding-left: 6px }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 750; letter-spacing: -.02em }
.brand .mk { width: 28px; height: 28px; flex: none; border-radius: 8px; object-fit: contain; box-shadow: var(--shadow) }
.brand b { font-size: 15.5px }
.brand span { font-size: 11.5px; font-weight: 600; color: var(--faint); letter-spacing: 0 }
.nav-l { display: flex; gap: 2px; justify-self: center }
.nav-l a {
  position: relative; padding: 7px 12px; border-radius: 999px; font-size: 13.5px; font-weight: 600;
  color: var(--sub); transition: color .18s var(--ease), background .18s var(--ease)
}
.nav-l a:hover { color: var(--ink); background: var(--hover) }
.nav-l a.on { color: var(--acc-ink); background: color-mix(in srgb, var(--acc) 12%, transparent) }
.nav-in > .btn { justify-self: end }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  font-size: 14px; font-weight: 680; letter-spacing: -.01em; white-space: nowrap;
  transition: transform .18s var(--spring), box-shadow .22s var(--ease), background .22s var(--ease), color .22s var(--ease)
}
.btn svg { width: 16px; height: 16px }
.btn-p {
  color: #fff; background: linear-gradient(160deg, #22c98f, var(--acc-600) 58%, #047857);
  box-shadow: 0 1px 0 rgb(255 255 255 / .38) inset, 0 8px 20px -6px color-mix(in srgb, var(--acc) 60%, transparent), 0 2px 6px rgba(4, 120, 87, .28)
}
.btn-p:hover { transform: translateY(-2px); box-shadow: 0 1px 0 rgb(255 255 255 / .44) inset, 0 16px 32px -10px color-mix(in srgb, var(--acc) 68%, transparent) }
.btn-p:active { transform: translateY(0) scale(.985) }
.btn-g {
  color: var(--ink); background: color-mix(in srgb, var(--glass) 74%, transparent);
  border-color: var(--card-line); box-shadow: var(--shadow), inset 0 1px 0 var(--rim);
  backdrop-filter: blur(18px) saturate(1.6); -webkit-backdrop-filter: blur(18px) saturate(1.6)
}
.btn-g:hover { transform: translateY(-2px); background: color-mix(in srgb, var(--glass) 92%, transparent) }
.btn-lg { padding: 13px 26px; font-size: 14.5px }
.btn-sm { padding: 7px 14px; font-size: 12.5px }

/* ---------- 首屏 ---------- */
.hero { position: relative; padding: 140px 0 20px; text-align: center }
.pill {
  display: inline-flex; align-items: center; gap: 9px; padding: 5px 14px 5px 7px; margin: 0;
  border-radius: 999px; font-size: 12.5px; font-weight: 640; color: var(--sub);
  background: color-mix(in srgb, var(--glass) 72%, transparent); border: 1px solid var(--card-line);
  box-shadow: var(--shadow), inset 0 1px 0 var(--rim);
  backdrop-filter: blur(20px) saturate(1.7); -webkit-backdrop-filter: blur(20px) saturate(1.7)
}
.pill b { color: var(--acc-ink); font-weight: 720 }
.hero h1 {
  font-size: clamp(34px, 5.2vw, 58px); line-height: 1.14; font-weight: 780; letter-spacing: -.032em;
  margin-bottom: 18px; text-wrap: balance
}
.hero h1 em {
  font-style: normal; position: relative; white-space: nowrap;
  background: linear-gradient(104deg, var(--acc-600), #14b8a6 42%, #3b82f6 92%);
  -webkit-background-clip: text; background-clip: text; color: transparent
}
.hero h1 em::after {
  content: ""; position: absolute; left: 2%; right: 2%; bottom: .06em; height: .10em; border-radius: 999px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--acc) 62%, transparent), color-mix(in srgb, #3b82f6 40%, transparent));
  opacity: .55
}
.hero .lead {
  max-width: 600px; margin: 0 auto 26px; font-size: clamp(14.5px, 1.3vw, 16.5px);
  line-height: 1.85; color: var(--sub); text-wrap: pretty
}
.hero .lead b { color: var(--ink); font-weight: 680 }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 16px }

/* 数字条 */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; max-width: 520px; margin: 30px auto 0 }
.stat {
  padding: 13px 8px 12px; border-radius: var(--r3); text-align: center;
  background: var(--card); border: 1px solid var(--card-line);
  box-shadow: inset 0 1px 0 var(--rim);
  backdrop-filter: blur(16px) saturate(1.5); -webkit-backdrop-filter: blur(16px) saturate(1.5);
  transition: transform .22s var(--spring), box-shadow .22s var(--ease)
}
.stat:hover { transform: translateY(-3px); box-shadow: var(--shadow), inset 0 1px 0 var(--rim) }
.stat b { display: block; font-size: 22px; font-weight: 800; letter-spacing: -.03em; line-height: 1.2; color: var(--ink); font-variant-numeric: tabular-nums }
.stat span { display: block; margin-top: 2px; font-size: 11.5px; color: var(--faint); font-weight: 600 }

/* ---------- 演示图 ---------- */
.stage { position: relative; margin-top: 46px }
/* 演示图统一装进 macOS 窗框：上面一条标题栏 + 左上角三个交通灯，图片落在栏下。
   色点和标题栏都是 CSS 画的，所以站长只用覆盖 shot-*.jpg 换截图，不用动 HTML，
   换进去的裸图会自动带上门框。 */
.shot {
  position: relative; padding: 32px 10px 10px; border-radius: var(--r4);
  background: var(--glass); border: 1px solid var(--card-line);
  box-shadow: var(--shadow-win), inset 0 1px 0 var(--rim);
  backdrop-filter: blur(20px) saturate(1.6); -webkit-backdrop-filter: blur(20px) saturate(1.6)
}
.shot::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 32px;
  border-radius: calc(var(--r4) - 1px) calc(var(--r4) - 1px) 0 0;
  background: linear-gradient(180deg, rgb(255 255 255 / .055), rgb(255 255 255 / .018));
  box-shadow: 0 1px 0 rgb(255 255 255 / .07)
}
.shot::after {
  content: ""; position: absolute; top: 13px; left: 16px; width: 54px; height: 12px; border-radius: 999px;
  background:
    radial-gradient(circle at 6px 6px, #ff5f57 0 5.5px, rgb(0 0 0 / 0) 6px),
    radial-gradient(circle at 27px 6px, #febc2e 0 5.5px, rgb(0 0 0 / 0) 6px),
    radial-gradient(circle at 48px 6px, #28c840 0 5.5px, rgb(0 0 0 / 0) 6px)
}
.shot img { width: 100%; height: auto; display: block; border-radius: var(--r1); border: 1px solid rgb(0 0 0 / .4) }
.shot-cap { margin-top: 14px; font-size: 12px; color: var(--faint) }
.shot-cap kbd {
  display: inline-block; padding: 1px 6px; margin: 0 1px; border-radius: 5px; font-size: 11px; font-family: inherit;
  background: var(--glass-2); border: 1px solid var(--card-line); box-shadow: 0 1px 0 var(--card-line)
}
.shot-cap a { color: var(--acc-ink); font-weight: 650; text-decoration: underline; text-underline-offset: 3px }
.cap { margin-top: 14px; font-size: 12.5px; color: var(--faint); text-align: center; line-height: 1.7 }
.cap-a { display: flex; justify-content: center; margin-top: 12px }

/* ---------- 段落标题 ---------- */
.head { max-width: 620px; margin-bottom: 42px }
.head.c { margin-inline: auto; text-align: center }
.eyebrow {
  display: inline-flex; align-items: center; gap: 7px; margin-bottom: 10px;
  font-size: 11.5px; font-weight: 750; letter-spacing: .10em; text-transform: uppercase; color: var(--acc-ink)
}
.eyebrow::before { content: ""; width: 18px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--acc), transparent) }
.head.c .eyebrow::before { background: linear-gradient(90deg, transparent, var(--acc), transparent); width: 26px }
.head h2 { font-size: clamp(23px, 2.9vw, 32px); line-height: 1.24; font-weight: 760; letter-spacing: -.026em; margin-bottom: 12px; text-wrap: balance }
.head p { font-size: 14.5px; color: var(--sub); line-height: 1.85; text-wrap: pretty }
.head p b { color: var(--ink); font-weight: 680 }
.head p a { color: var(--acc-ink); font-weight: 650; text-decoration: underline; text-underline-offset: 3px }
.head p.kvline { margin-top: 10px; font-size: 12px; font-weight: 600; color: var(--faint); letter-spacing: .01em; font-variant-numeric: tabular-nums }

/* ---------- 功能卡：图标与标题同一行 ---------- */
.grid { display: grid; gap: 16px }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)) }
.card {
  position: relative; overflow: hidden; padding: 22px 20px; border-radius: var(--r4);
  background: var(--card); border: 1px solid var(--card-line);
  box-shadow: var(--shadow), inset 0 1px 0 var(--rim);
  backdrop-filter: blur(20px) saturate(1.6); -webkit-backdrop-filter: blur(20px) saturate(1.6);
  transition: transform .26s var(--spring), box-shadow .26s var(--ease), border-color .26s var(--ease)
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0;
  background: radial-gradient(240px 160px at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--acc) 16%, transparent), transparent 70%);
  transition: opacity .3s var(--ease)
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg), inset 0 1px 0 var(--rim); border-color: color-mix(in srgb, var(--acc) 32%, var(--card-line)) }
.card:hover::after { opacity: 1 }
.card > * { position: relative; z-index: 1 }
.c-h { display: flex; align-items: center; gap: 11px; margin-bottom: 10px; min-width: 0 }
.c-ic {
  width: 32px; height: 32px; flex: none; border-radius: 10px; display: grid; place-items: center; color: #fff;
  background: linear-gradient(150deg, var(--c1, var(--acc)), var(--c2, var(--acc-600)));
  box-shadow: 0 6px 14px -6px color-mix(in srgb, var(--c2, var(--acc-600)) 70%, transparent), inset 0 1px 0 rgb(255 255 255 / .38)
}
.c-ic svg { width: 16px; height: 16px }
.card h3 { min-width: 0; font-size: 15.5px; font-weight: 720; letter-spacing: -.015em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis }
.card p { font-size: 13.4px; color: var(--sub); line-height: 1.8 }

/* ---------- 图文左右排 ---------- */
.row2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr); gap: 48px; align-items: center }
.row2.flip .txt { order: 2 }
.txt > p { font-size: clamp(14.2px, 1.02vw, 15.4px); color: var(--sub); line-height: 1.85; margin-bottom: 16px }
.txt > p b { color: var(--ink); font-weight: 680 }
.txt > p.eyebrow { font-size: 11.5px; margin-bottom: 10px }
.txt h2 { font-size: clamp(21px, 2.4vw, 27px); line-height: 1.26; font-weight: 760; letter-spacing: -.024em; margin-bottom: 12px; text-wrap: balance }
.txt p.lb { font-size: 12.5px; color: var(--faint); margin: 20px 0 8px }

/* 一行一条：勾 + 标题 + 说明，标题不换行 */
.flist { display: grid; gap: 12px }
.flist li { display: grid; grid-template-columns: 22px auto minmax(0, 1fr); align-items: center; gap: 10px }
.flist li i {
  width: 22px; height: 22px; border-radius: 7px; display: grid; place-items: center;
  color: var(--acc-600); background: color-mix(in srgb, var(--acc) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--acc) 22%, transparent)
}
.flist li i svg { width: 12px; height: 12px }
.flist li b { font-size: 14px; font-weight: 700; letter-spacing: -.01em; white-space: nowrap }
.flist li span { font-size: 12.8px; color: var(--faint); line-height: 1.65 }
/* 标题长到一行放不下说明的块（启动台那一屏）：标题单独一行，说明跟在下面，勾仍然顶对齐 */
.flist.stack li { grid-template-columns: 22px minmax(0, 1fr); align-items: start; gap: 4px 10px }
.flist.stack li b { white-space: normal }
.flist.stack li span { grid-column: 2 }

/* 胶囊：身份预设 / 搜索引擎 / 工具库分类 */
.pills { display: flex; flex-wrap: wrap; gap: 7px; justify-content: flex-start }
.head.c + .pills, .head.c ~ .pills { justify-content: center }
.pills s, .pills a {
  text-decoration: none; padding: 5px 12px; border-radius: 999px; font-size: 12px; font-weight: 660; color: var(--sub);
  background: var(--field); border: 1px solid var(--card-line); transition: color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--spring)
}
.pills a:hover { color: var(--acc-ink); border-color: color-mix(in srgb, var(--acc) 40%, var(--card-line)); transform: translateY(-1px) }
.note {
  margin-top: 20px; padding: 13px 15px; border-radius: var(--r2);
  font-size: 12.2px; line-height: 1.85; color: var(--faint);
  background: var(--field); border: 1px solid var(--card-line)
}
.txt > p.note { font-size: 12.2px; color: var(--faint); line-height: 1.85; margin-bottom: 0 }
.note b { display: block; margin-bottom: 4px; color: var(--sub); font-weight: 720; letter-spacing: -.01em }
.note a { color: var(--acc-ink); font-weight: 660; text-decoration: underline; text-underline-offset: 3px }

/* ---------- 人群落地页的工具卡：四列小卡，图标 + 站名 + 一句说明 ---------- */
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)) }
.grid + .pills { margin-top: 30px }
.tool {
  display: flex; align-items: center; gap: 11px; padding: 14px 15px; border-radius: var(--r2);
  background: var(--card); border: 1px solid var(--card-line);
  box-shadow: var(--shadow), inset 0 1px 0 var(--rim);
  text-decoration: none; color: inherit;
  transition: transform .26s var(--spring), border-color .26s var(--ease), box-shadow .26s var(--ease)
}
.tool:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--acc) 32%, var(--card-line)); box-shadow: var(--shadow-lg), inset 0 1px 0 var(--rim) }
.tool img {
  width: 30px; height: 30px; flex: none; border-radius: 8px; object-fit: contain;
  background: var(--field); border: 1px solid var(--card-line); padding: 3px
}
.tool .t-t { min-width: 0 }
.tool b { display: block; font-size: 13.5px; font-weight: 700; letter-spacing: -.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis }
.tool span { display: block; font-size: 11.8px; color: var(--faint); line-height: 1.6; white-space: nowrap; overflow: hidden; text-overflow: ellipsis }

/* ---------- 隐私空间 ---------- */
.vault {
  position: relative; overflow: hidden; padding: 46px 42px; border-radius: var(--r6);
  background: linear-gradient(158deg, #171a1d 0%, #101315 46%, #0b0d0f 100%);
  border: 1px solid rgba(255, 255, 255, .10);
  box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .8), inset 0 1px 0 rgba(255, 255, 255, .10)
}
.vault::before {
  content: ""; position: absolute; inset: -30% -10% auto auto; width: 60%; height: 130%; pointer-events: none;
  background: radial-gradient(50% 50% at 60% 40%, rgba(16, 185, 129, .26), transparent 70%); filter: blur(30px)
}
.vault > * { position: relative; z-index: 1 }
.vault .eyebrow { color: #6ee7b7 }
.vault h2 { color: #f6f7f9 }
.vault .head p { color: #b6bcc4 }
.vault .head p b { color: #f2f4f6 }
.vault .head { margin-bottom: 30px }
.vrow { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr); gap: 40px; align-items: center }
.vlist { display: grid; gap: 12px }
.vitem {
  display: flex; gap: 13px; align-items: flex-start; padding: 14px 16px; border-radius: var(--r3);
  background: rgba(255, 255, 255, .045); border: 1px solid rgba(255, 255, 255, .09);
  transition: background .24s var(--ease), transform .24s var(--spring)
}
.vitem:hover { background: rgba(255, 255, 255, .075); transform: translateX(3px) }
.vitem i {
  width: 26px; height: 26px; flex: none; margin-top: 1px; border-radius: 8px; display: grid; place-items: center; color: #06281d;
  background: linear-gradient(150deg, #6ee7b7, #10b981); box-shadow: 0 6px 16px -6px rgba(16, 185, 129, .8), inset 0 1px 0 rgba(255, 255, 255, .5)
}
.vitem i svg { width: 14px; height: 14px }
.vitem div { min-width: 0 }
.vitem b { display: block; font-size: 14px; font-weight: 700; color: #f3f5f7; letter-spacing: -.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis }
.vitem span { display: block; margin-top: 2px; font-size: 12.6px; color: #a8b0b9; line-height: 1.7 }
.vspec {
  margin-top: 16px; padding: 13px 15px; border-radius: var(--r2); font-size: 12px; line-height: 1.85; color: #9fb6ab;
  background: rgba(16, 185, 129, .07); border: 1px solid rgba(16, 185, 129, .18)
}
.vspec b { color: #6ee7b7; font-weight: 700 }
.vspec a { color: #6ee7b7; font-weight: 660; text-decoration: underline; text-underline-offset: 3px }
.vlim {
  margin-top: 13px; padding-top: 13px; border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 12px; line-height: 1.85; color: rgba(255, 255, 255, .56); text-wrap: pretty
}

/* ---------- 常见问题 ---------- */
.faq { display: grid; gap: 10px; max-width: 760px; margin-inline: auto }
.qa { overflow: hidden; border-radius: var(--r3); background: var(--card); border: 1px solid var(--card-line); box-shadow: inset 0 1px 0 var(--rim); transition: border-color .24s var(--ease), box-shadow .24s var(--ease) }
.qa.open { border-color: color-mix(in srgb, var(--acc) 34%, var(--card-line)); box-shadow: var(--shadow), inset 0 1px 0 var(--rim) }
.qa button {
  display: flex; align-items: center; gap: 14px; width: 100%; padding: 16px 18px; cursor: pointer;
  background: none; border: 0; text-align: left; font-size: 14.4px; font-weight: 680; letter-spacing: -.01em
}
.qa button span { min-width: 0 }
.qa button i {
  width: 22px; height: 22px; flex: none; margin-left: auto; border-radius: 999px; display: grid; place-items: center;
  color: var(--faint); background: var(--field); border: 1px solid var(--card-line); transition: transform .3s var(--spring), color .24s, background .24s
}
.qa button i svg { width: 12px; height: 12px }
.qa.open button i { transform: rotate(45deg); color: #fff; background: var(--acc-600); border-color: transparent }
.qa .a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .34s var(--ease) }
.qa.open .a { grid-template-rows: 1fr }
.qa .a > div { overflow: hidden }
.qa .a p { padding: 0 48px 17px 18px; font-size: 13.6px; color: var(--sub); line-height: 1.85 }
.qa .a p b { color: var(--ink); font-weight: 680 }
.qa .a a { color: var(--acc-ink); font-weight: 650; text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--acc) 40%, transparent); text-underline-offset: 3px }

/* ---------- 结尾 CTA ---------- */
.cta { position: relative; overflow: hidden; padding: 50px 32px; border-radius: var(--r6); text-align: center; background: var(--card); border: 1px solid var(--card-line); box-shadow: var(--shadow-lg), inset 0 1px 0 var(--rim); backdrop-filter: blur(24px) saturate(1.7); -webkit-backdrop-filter: blur(24px) saturate(1.7) }
.cta::before { content: ""; position: absolute; inset: -60% 20% auto 20%; height: 160%; pointer-events: none; background: radial-gradient(50% 50% at 50% 50%, color-mix(in srgb, var(--acc) 22%, transparent), transparent 70%); filter: blur(28px) }
.cta > * { position: relative; z-index: 1 }
.cta h2 { font-size: clamp(22px, 2.8vw, 30px); font-weight: 760; letter-spacing: -.026em; line-height: 1.24; margin-bottom: 10px }
.cta p { max-width: 520px; margin: 0 auto 22px; font-size: 14.2px; color: var(--sub); line-height: 1.75 }
.cta .hero-cta { margin-bottom: 12px }
.cta small { display: block; font-size: 12px; color: var(--faint) }

/* ---------- 页脚 ---------- */
.foot { margin-top: 72px; padding: 38px 0 34px; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--glass) 46%, transparent); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px) }
.foot-in { display: grid; grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)); gap: 28px }
.foot .brand { margin-bottom: 10px }
.foot p { font-size: 12.8px; color: var(--faint); line-height: 1.7; max-width: 300px }
.foot h4 { font-size: 11.5px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; color: var(--ink); margin-bottom: 10px }
.foot ul { display: grid; gap: 8px }
.foot ul a { font-size: 13px; color: var(--sub); transition: color .18s var(--ease), transform .18s var(--ease); display: inline-block }
.foot ul a:hover { color: var(--acc-ink); transform: translateX(2px) }
.foot-b { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 12px; color: var(--faint) }
.foot-b a { color: var(--faint) }
.foot-b a:hover { color: var(--acc-ink) }

/* ---------- 出场动画 ----------
   全部走 transition + .in 类：不依赖 animation 播放，
   即使浏览器把动画冻住（后台标签、省电模式）内容也不会一直停在透明态。 */
.rv { opacity: 0; transform: translateY(22px); transition: opacity .62s var(--ease), transform .62s var(--ease) }
.rv.in { opacity: 1; transform: none }
.rv[data-d="1"] { transition-delay: .07s } .rv[data-d="2"] { transition-delay: .14s }
.rv[data-d="3"] { transition-delay: .21s } .rv[data-d="4"] { transition-delay: .28s }
.rv[data-d="5"] { transition-delay: .35s } .rv[data-d="6"] { transition-delay: .42s }
.hero .rv:not(.in) { transform: translateY(26px) }
.stage.rv:not(.in) { transform: translateY(46px) scale(.97) }
.stage.rv { transition-duration: .9s; transition-delay: .5s }

.skip { position: absolute; left: -9999px; top: 0; z-index: 99; padding: 10px 16px; border-radius: 0 0 10px 0; background: var(--acc-600); color: #fff; font-weight: 700 }
.skip:focus { left: 0 }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)) }
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)) }
  .row2, .vrow { grid-template-columns: minmax(0, 1fr); gap: 30px }
  .row2.flip .txt { order: 0 }
  .foot-in { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) }
  .vault { padding: 36px 24px }
}
@media (max-width: 780px) {
  .nav-in { grid-template-columns: 1fr auto }
  .nav-l { display: none }
  .hero { padding-top: 112px }
  .sec { padding: 76px 0 }
  .cta { padding: 40px 20px }
}
@media (max-width: 620px) {
  .wrap { width: calc(100% - 28px) }
  .g3, .g4 { grid-template-columns: minmax(0, 1fr) }
  .foot-in { grid-template-columns: 1fr }
  .card { padding: 18px 16px }
  .flist li { grid-template-columns: 22px minmax(0, 1fr) }
  .flist li span { grid-column: 2 }
  .hero-cta .btn { flex: 1 }
  .qa .a p { padding-right: 18px }
  .brand span { display: none }
  .vault { padding: 30px 18px }
}