/* InSnap 官网样式 —— 「留白」风格：深色单主题，克制、安静、大间距。
   没有点阵 / 角标 / 荧光笔 / 条带等装饰，靠字号、字重和留白做层次。
   无框架、无外部字体。滚动特效是 CSS 滚动驱动动画（animation-timeline），
   不支持的浏览器自动退回静态版式。下拉菜单 / 移动端菜单是纯 CSS。 */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --alt: #fbfbfd;
  --card: #ffffff;
  --card-hi: #ffffff;
  --panel: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.09);
  --line-hi: rgba(0, 0, 0, 0.32);
  --link: #0a64d6;
  --btn: #1f6feb;
  --btn-hover: #3a82f2;
  --on-btn: #ffffff;
  --soft: rgba(0, 0, 0, 0.05);
  --ok: #1f9d55;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.22), 0 0 0 1px rgba(0, 0, 0, 0.06);
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: var(--bg); }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 17px/1.65 var(--font); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: clip; }
img, svg, video { display: block; max-width: 100%; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--btn); outline-offset: 2px; border-radius: 6px; }
h1, h2, h3, h4 { line-height: 1.08; letter-spacing: -0.035em; margin: 0; font-weight: 600; text-wrap: balance; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 40px; }
.narrow { max-width: 780px; }
.skip { position: absolute; left: -9999px; top: 0; background: var(--btn); color: var(--on-btn); padding: 10px 14px; z-index: 200; }
.skip:focus { left: 8px; top: 8px; border-radius: 6px; }

/* 关键字不再高亮，保留类名供模板使用 */
.mark { color: inherit; }
.mono { font-family: var(--mono); }

/* 滚动进度：顶部一根细线 */
.progress { position: fixed; left: 0; right: 0; top: 0; height: 2px; background: var(--btn); transform-origin: 0 50%; transform: scaleX(0); z-index: 120; }

/* ===== 顶栏 ===== */
.site-header { position: sticky; top: 0; z-index: 90; border-bottom: 1px solid transparent; background: rgba(255, 255, 255, 0); -webkit-backdrop-filter: saturate(100%) blur(0px); backdrop-filter: saturate(100%) blur(0px); transition: background-color 0.3s, border-color 0.3s, -webkit-backdrop-filter 0.3s, backdrop-filter 0.3s; }
.site-header.scrolled { background: rgba(255, 255, 255, 0.6); border-bottom-color: rgba(255, 255, 255, 0.8); -webkit-backdrop-filter: saturate(180%) blur(28px); backdrop-filter: saturate(180%) blur(28px); box-shadow: 0 1px 0 rgba(20, 60, 140, 0.06), 0 12px 32px -20px rgba(31, 111, 235, 0.3); }
.header-row { display: flex; align-items: center; gap: 8px; height: 76px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; font-size: 18px; letter-spacing: -0.03em; margin-right: 24px; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav { display: flex; align-items: center; gap: 2px; }
.nav > a, .nav-trigger { display: inline-flex; align-items: center; gap: 6px; height: 38px; padding: 0 14px; border-radius: 8px; color: var(--muted); font-size: 14.5px; font-weight: 500; background: none; border: 0; cursor: pointer; transition: color 0.15s; }
.nav > a:hover, .nav-item:hover > .nav-trigger, .nav-item:focus-within > .nav-trigger, .nav > a[aria-current="page"] { color: var(--text); text-decoration: none; }
.nav-trigger svg { width: 14px; height: 14px; opacity: 0.55; transition: transform 0.15s; }
.nav-item:hover .nav-trigger svg, .nav-item:focus-within .nav-trigger svg { transform: rotate(180deg); }
.nav-item { position: relative; }
.menu { position: absolute; top: 100%; left: -8px; min-width: 330px; padding: 12px; margin-top: 6px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(6px); transition: opacity 0.14s, transform 0.14s, visibility 0.14s; }
.menu::before { content: ""; position: absolute; left: 0; right: 0; top: -14px; height: 14px; }
.nav-item:hover .menu, .nav-item:focus-within .menu { opacity: 1; visibility: visible; transform: none; }
.menu a.entry { display: flex; gap: 14px; align-items: center; padding: 10px; border-radius: 12px; color: var(--text); }
.menu a.entry:hover, .menu a.plain:hover { background: var(--soft); text-decoration: none; }
.menu .tile { flex: none; width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--soft); color: var(--text); }
.menu .tile svg { width: 22px; height: 22px; }
.menu .entry b { display: block; font-size: 15px; font-weight: 550; line-height: 1.25; }
.menu .entry span { display: block; font-size: 13px; color: var(--muted); line-height: 1.35; margin-top: 2px; }
.menu hr { border: 0; border-top: 1px solid var(--line); margin: 8px 10px; }
.menu a.plain { display: flex; align-items: center; gap: 12px; padding: 10px; border-radius: 12px; color: var(--text); font-size: 15px; font-weight: 500; }
.menu a.plain svg { width: 19px; height: 19px; color: var(--muted); }
.menu.sm { min-width: 240px; }
.header-end { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.nav-account { color: var(--muted); font-size: 14.5px; font-weight: 500; padding: 8px 4px; transition: color 0.15s; }
.nav-account:hover { color: var(--text); text-decoration: none; }
.container.narrow-ac { max-width: 960px; }
.burger { display: none; width: 42px; height: 42px; border-radius: 8px; cursor: pointer; place-items: center; }
.burger:hover { background: var(--soft); }
.burger svg { width: 24px; height: 24px; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle:focus-visible ~ .header-row .burger { outline: 3px solid var(--btn); }
.mobile-menu { display: none; border-top: 1px solid var(--line); background: var(--bg); padding: 12px 24px 28px; }
.mobile-menu .mh { font-size: 13px; font-weight: 500; letter-spacing: 0; color: var(--muted); margin: 24px 8px 6px; }
.mobile-menu a { display: flex; gap: 12px; align-items: center; padding: 13px 8px; color: var(--text); font-size: 17px; font-weight: 500; border-radius: 8px; }
.mobile-menu a svg { width: 22px; height: 22px; color: var(--muted); }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 50px; padding: 0 30px; border-radius: 999px; font: 550 16px/1 var(--font); border: 1px solid transparent; cursor: pointer; text-decoration: none !important; transition: background-color 0.15s, transform 0.15s; }
.btn-primary { background: var(--btn); color: var(--on-btn); }
.btn-primary:hover { background: var(--btn-hover); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: rgba(0, 0, 0, 0.18); }
.btn-ghost:hover { background: var(--soft); }
.btn-sm { height: 36px; padding: 0 18px; font-size: 14.5px; }
.btn-block { width: 100%; }
.btn-lg { height: 54px; padding: 0 34px; font-size: 16.5px; }
.btn-disabled { background: var(--soft); color: var(--muted); cursor: not-allowed; border-color: var(--line); }
.btn svg { width: 18px; height: 18px; flex: none; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 48px; }
.fine { font-size: 13.5px; line-height: 1.5; color: var(--muted); margin-top: 28px; }

/* ===== 画面：视频的外框（只有圆角和一层极淡的描边） ===== */
.frame { position: relative; margin: 0; }
.frame video { width: 100%; height: auto; aspect-ratio: 1280 / 800; object-fit: cover; background: #e8e8ed; border-radius: 16px; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08), 0 40px 80px -40px rgba(0, 0, 0, 0.35); }
.stage-frame video { transition: opacity 0.25s; }
.stage-frame video.buf { position: absolute; left: 0; top: 0; opacity: 0; }
.stage-frame video.on { opacity: 1; }
.frame .c, .frame .size { display: none; }

/* ===== 首屏 ===== */
.hero { position: relative; padding: 168px 0 0; text-align: center; overflow: clip; }
.eyebrow { display: inline-block; font: 500 14px/1 var(--font); color: var(--muted); }
.hero h1 { font-size: clamp(44px, 7vw, 92px); letter-spacing: -0.035em; word-spacing: 0.06em; line-height: 1.04; margin-top: 32px; }
.hero .lead { font-size: clamp(18px, 1.7vw, 21px); line-height: 1.6; color: var(--muted); max-width: 30em; margin: 32px auto 0; text-wrap: balance; }
.hero-stage { margin-top: 120px; max-width: 1040px; }

/* ===== 首页功能分区：一句话标题 + 一组真实操作短片 ===== */
.feat { padding: 200px 0 0; }
.feat-head { max-width: 720px; margin: 0 auto; text-align: center; }
.idx { font: 500 14px/1 var(--font); color: var(--muted); }
.feat-head h2 { font-size: clamp(34px, 4.4vw, 56px); margin-top: 24px; }
.feat-head p { font-size: 19px; line-height: 1.6; color: var(--muted); margin-top: 24px; }
.scrolly { margin-top: 96px; }
.showcase { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: 96px; align-items: center; }
.tabs { display: grid; gap: 4px; }
.tab { display: block; width: 100%; text-align: left; background: none; border: 0; border-left: 1px solid var(--line); padding: 18px 0 18px 28px; cursor: pointer; color: var(--muted); transition: color 0.3s ease, border-color 0.3s ease; }
.tab b { display: block; font-size: 20px; font-weight: 550; letter-spacing: -0.02em; line-height: 1.3; }
.tab > span { display: block; font-size: 15.5px; line-height: 1.6; margin-top: 8px; max-width: 28em; }
.tab:hover { color: var(--text); }
.tab.is-active { color: var(--text); border-color: var(--text); }
.tab.is-active > span { color: var(--muted); }
.js .tab > span { display: block; max-height: 0; margin-top: 0; opacity: 0; overflow: hidden; transition: max-height 0.35s ease, margin-top 0.35s ease, opacity 0.25s ease; }
.js .tab.is-active > span { max-height: 180px; margin-top: 8px; opacity: 1; transition-delay: 0s, 0s, 0.1s; }
.panel { background: var(--panel); border: 0; border-radius: 28px; padding: 28px; }
.panel .frame video { border-radius: 14px; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06), 0 24px 48px -28px rgba(0, 0, 0, 0.35); }
.feat .more { display: flex; justify-content: center; margin-top: 80px; }
.more { display: inline-flex; align-items: center; gap: 8px; font-weight: 500; color: var(--text); }
.more svg { width: 18px; height: 18px; opacity: 0.6; transition: transform 0.15s; }
.more:hover { text-decoration: none; }
.more:hover svg { transform: translate(3px, -3px); }
.tag { display: inline-block; vertical-align: middle; margin-left: 10px; padding: 4px 9px; font: 500 11.5px/1 var(--font); color: var(--text); background: var(--soft); border-radius: 999px; }

/* ===== 产品页：功能列表 + 粘性画面 ===== */
.page-head { padding: 144px 0 56px; text-align: center; }
.page-head h1 { font-size: clamp(38px, 5.6vw, 72px); letter-spacing: -0.035em; max-width: 13em; margin: 0 auto; }
.page-head p { color: var(--muted); font-size: 20px; line-height: 1.6; max-width: 34em; margin: 28px auto 0; text-wrap: balance; }
.page-head .picon { width: 60px; height: 60px; border-radius: 16px; margin: 0 auto 32px; display: grid; place-items: center; background: var(--soft); color: var(--text); }
.page-head .picon svg { width: 28px; height: 28px; }
.page-head.lg { padding: 168px 0; }
.explorer { padding: 40px 0 0; }
.explorer-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 120px; align-items: stretch; }
.group-title { font: 500 14px/1 var(--font); color: var(--muted); padding: 0 0 8px; margin-top: 72px; }
.group:first-child .group-title { margin-top: 0; }
.step { padding: 44px 0 44px 32px; border-left: 1px solid var(--line); margin-left: 4px; position: relative; }
.step .num { font: 500 13px/1 var(--font); color: var(--muted); }
.step h4 { font-size: 28px; margin-top: 12px; letter-spacing: -0.03em; }
.step p { color: var(--muted); font-size: 17px; line-height: 1.65; margin-top: 16px; max-width: 30em; }
.step-media .frame { margin-top: 48px; }
.stage-col { display: none; }
@media (min-width: 961px) {
  .js .stage-col { display: block; }
  .js .step-media { display: none; }
  .js .step { min-height: 48vh; display: flex; flex-direction: column; justify-content: center; opacity: 0.4; transition: opacity 0.3s, border-color 0.3s; }
  .js .step.is-active { opacity: 1; border-color: var(--text); }
  .stage { position: sticky; top: calc(50vh - 240px); }
}
.also { padding: 200px 0 0; text-align: center; }
.also h2 { font-size: clamp(30px, 4vw, 48px); }
.chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 56px; }
.chips li { display: inline-flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 500; padding: 11px 20px; border-radius: 999px; background: var(--soft); }
.chips svg { display: none; }

/* ===== 价格 ===== */
.pricing-sec { padding: 240px 0 0; text-align: center; }
.pricing-sec h2 { font-size: clamp(34px, 4.4vw, 56px); }
.pricing-sec .sub { color: var(--muted); font-size: 19px; line-height: 1.6; margin: 24px auto 0; max-width: 34em; }
.pricing-sec .plans, .pricing-sec .plan { text-align: left; }
.pricing-sec .plans { margin-top: 96px; }
.pricing-sec .container.one { max-width: 480px; }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 24px; padding: 48px 40px 40px; }
.plan.featured { background: var(--card-hi); border-color: var(--line-hi); box-shadow: 0 30px 60px -40px rgba(0, 0, 0, 0.25); }
.plan .badge { position: absolute; top: 24px; right: 24px; background: var(--soft); color: var(--text); font: 500 12px/1 var(--font); padding: 7px 12px; border-radius: 999px; }
.plan h3 { font-size: 20px; letter-spacing: -0.02em; }
.plan .for { color: var(--muted); font-size: 15px; line-height: 1.6; margin-top: 12px; min-height: 48px; }
.price { margin-top: 32px; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.price b { font-size: 56px; font-weight: 600; letter-spacing: -0.045em; line-height: 1; }
.price span { color: var(--muted); font-size: 16px; }
.price-alt { color: var(--muted); font-size: 15px; margin-top: 12px; min-height: 24px; }
.plan .btn { margin-top: 36px; }
.plan .note { font-size: 13.5px; color: var(--muted); margin-top: 14px; text-align: center; }
.plan ul { margin-top: 36px; padding-top: 32px; border-top: 1px solid var(--line); display: grid; gap: 16px; font-size: 15px; color: var(--muted); }
.plan li { display: flex; gap: 10px; }
.plan li svg { width: 19px; height: 19px; flex: none; margin-top: 3px; color: var(--muted); }
.plan li.muted { color: var(--muted); }
.plan li.muted svg { opacity: 0.45; }
.plan li.muted a { text-decoration: underline; text-underline-offset: 2px; }
.cap { text-align: center; margin-top: 48px; font-size: 15px; color: var(--muted); }

/* ===== CTA / 页脚 ===== */
.band { padding: 240px 0 220px; text-align: center; }
.band img { width: 64px; height: 64px; border-radius: 15px; margin: 0 auto 40px; }
.band h2 { font-size: clamp(36px, 5vw, 64px); max-width: 12em; margin: 0 auto; }
.site-footer { border-top: 1px solid var(--line); padding: 96px 0 48px; font-size: 15px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: 48px; }
.foot-grid h2 { margin: 0 0 20px; font: 500 13px/1 var(--font); color: var(--muted); }
.foot-grid li { margin: 14px 0; }
.foot-grid a { color: var(--text); opacity: 0.7; transition: opacity 0.15s; }
.foot-grid a:hover { opacity: 1; text-decoration: none; }
.foot-note { color: var(--muted); margin-top: 16px; max-width: 24em; line-height: 1.6; }
.foot-bottom { margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13.5px; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

/* ===== 二级页通用 ===== */
.pill { display: inline-block; font: 500 14px/1 var(--font); color: var(--muted); margin-bottom: 28px; }
.section { padding: 144px 0; }
.section.alt { background: var(--alt); }
.section.pt-sm { padding-top: 16px; }
.section.pt-md { padding-top: 32px; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 72px; }
.section-head h2 { font-size: clamp(30px, 4vw, 48px); }
.section-head p { font-size: 19px; line-height: 1.6; color: var(--muted); margin-top: 20px; }
.faq-sec { padding: 200px 0 0; }
.faq-sec h2 { text-align: center; font-size: clamp(30px, 4vw, 48px); margin-bottom: 64px; }
.faq { max-width: 820px; margin: 0 auto; }
.faq details { border-top: 1px solid var(--line); padding: 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 28px 44px 28px 0; font-size: 18px; font-weight: 500; position: relative; letter-spacing: -0.01em; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 22px; line-height: 1; font-weight: 300; }
.faq details[open] summary::after { content: "–"; }
.faq .ans { padding: 0 0 32px; color: var(--muted); font-size: 16px; line-height: 1.7; max-width: 42em; }
.faq .ans p + p { margin-top: 14px; }
.buying { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.mini { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 36px; }
.mini h3 { font-size: 19px; letter-spacing: -0.015em; }
.mini p { color: var(--muted); font-size: 16px; line-height: 1.65; margin-top: 14px; }
.callout { background: var(--soft); border-radius: 20px; padding: 24px 28px; font-size: 16px; line-height: 1.65; color: var(--muted); }
.callout b { color: var(--text); font-weight: 550; }
.callout.mt { margin-top: 32px; }
.callout.box { max-width: 660px; margin: 32px auto 0; text-align: left; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 20px; background: var(--card); }
table.compare { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 15.5px; }
.compare th, .compare td { padding: 18px 24px; text-align: center; border-bottom: 1px solid var(--line); }
.compare th:first-child, .compare td:first-child { text-align: left; }
.compare thead th { font-size: 14.5px; font-weight: 550; }
.compare tbody tr:last-child td { border-bottom: 0; }
.compare .yes { color: var(--text); font-weight: 600; font-size: 17px; }
.compare .no { color: var(--muted); }
.compare .grp td { padding-top: 36px; font: 500 13px/1 var(--font); color: var(--muted); text-align: left; }
.steps { counter-reset: s; display: grid; max-width: 760px; margin: 0 auto; }
.steps li { counter-increment: s; display: flex; gap: 24px; padding: 28px 0; border-top: 1px solid var(--line); }
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps li::before { content: counter(s); flex: none; width: 32px; height: 32px; border-radius: 50%; background: var(--soft); color: var(--text); font: 500 14px/1 var(--font); display: grid; place-items: center; }
.steps b { display: block; font-size: 17px; font-weight: 550; }
.steps span { display: block; color: var(--muted); font-size: 15.5px; line-height: 1.6; margin-top: 6px; }
.perm { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.perm th, .perm td { text-align: left; padding: 18px 22px; border-bottom: 1px solid var(--line); vertical-align: top; }
.perm th { font-size: 14px; font-weight: 550; color: var(--muted); }
.stack { display: grid; gap: 24px; }
.narrow .section-head { max-width: none; }

/* ===== 下载页：平台卡片 / 分平台步骤 ===== */
.platforms { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; max-width: 800px; margin: 56px auto 0; text-align: left; }
.platform { display: flex; flex-direction: column; padding: 40px; }
.platform p.req { margin-top: 8px; font-size: 14.5px; }
.platform .btn { margin-top: 28px; align-self: flex-start; }
.platform .platform-note { font-size: 14.5px; line-height: 1.65; margin-top: 24px; }
.platform .platform-note b { color: var(--text); }
.os-block + .os-block { margin-top: 80px; }
.os-block > h3 { font-size: 20px; letter-spacing: -0.015em; margin-bottom: 28px; text-align: center; }
.os-text { color: var(--muted); font-size: 16px; line-height: 1.65; max-width: 760px; margin: 0 auto; }
@media (max-width: 680px) {
  .platforms { grid-template-columns: 1fr; }
}

/* ===== 法律文本 ===== */
.legal { padding: 72px 0 160px; }
.legal h1 { font-size: clamp(36px, 5vw, 56px); letter-spacing: -0.035em; }
.legal .meta { color: var(--muted); margin-top: 16px; font-size: 14px; line-height: 1.4; }
.legal .intro { margin-top: 32px; font-size: 18px; line-height: 1.7; }
.legal .toc { margin: 48px 0 8px; padding: 28px 32px; background: var(--soft); border-radius: 20px; font-size: 15px; columns: 2; column-gap: 40px; }
.legal .toc a { display: block; padding: 5px 0; color: var(--muted); break-inside: avoid; }
.legal .toc a:hover { color: var(--text); text-decoration: none; }
.legal h2 { font-size: 24px; margin-top: 72px; letter-spacing: -0.025em; scroll-margin-top: 100px; }
.legal p { margin-top: 18px; line-height: 1.75; }
.legal ul { margin-top: 16px; padding-left: 22px; list-style: disc; }
.legal li { margin-top: 10px; line-height: 1.7; }
.legal li::marker { color: var(--muted); }
.legal table { width: 100%; border-collapse: collapse; margin-top: 24px; font-size: 15px; }
.legal th, .legal td { text-align: left; vertical-align: top; padding: 16px 16px; border-bottom: 1px solid var(--line); }
.legal th { font-weight: 550; color: var(--muted); }

/* ===== 滚动驱动动画（CSS animation-timeline；不支持就是静态版式） ===== */
@supports (animation-timeline: view()) {
  @keyframes grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }
  .progress { animation: grow linear both; animation-timeline: scroll(root); }


  /* 首屏画面：随滚动轻轻就位 */
  @keyframes stage-in { from { transform: translateY(12px); opacity: 0.85; } to { transform: none; opacity: 1; } }
  .hero-stage .frame { animation: stage-in linear both; animation-timeline: scroll(root); animation-range: 0 520px; }

  @keyframes rise { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }
  .reveal, .step-media, .also h2, .chips li { animation: rise linear both; animation-timeline: view(); animation-range: entry 5% entry 60%; }
}

/* ===== 响应式 ===== */
@media (max-width: 1040px) {
  .nav { display: none; }
  .burger { display: grid; }
  .nav-toggle:checked ~ .mobile-menu { display: block; }
  .header-end .btn, .nav-account { display: none; }
}
@media (max-width: 960px) {
  .feat { padding-top: 128px; }
  .scrolly { margin-top: 64px; }
  .showcase { grid-template-columns: 1fr; gap: 40px; }
  .panel { order: -1; padding: 16px; border-radius: 20px; }
  .explorer-grid { grid-template-columns: 1fr; gap: 56px; }
  .plans, .buying { grid-template-columns: 1fr; }
  .plan { padding: 40px 32px 32px; }
  .plan .for { min-height: 0; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .legal .toc { columns: 1; }
  .pricing-sec { padding-top: 128px; }
  .pricing-sec .plans { margin-top: 56px; }
  .band { padding: 128px 0 120px; }
  .section { padding: 96px 0; }
  .hero { padding-top: 112px; }
  .hero-stage { margin-top: 72px; }
  .page-head { padding: 96px 0 40px; }
  .page-head.lg { padding: 112px 0; }
  .also, .faq-sec { padding-top: 128px; }
  .step { padding: 32px 0 32px 24px; }
  .step-media .frame { margin-top: 40px; }
}
@media (max-width: 520px) {
  body { font-size: 16.5px; }
  .container { padding: 0 24px; }
  .hero { padding-top: 80px; }
  .hero h1 { margin-top: 24px; }
  .hero .lead { margin-top: 24px; }
  .cta-row { margin-top: 40px; }
  .foot-grid { grid-template-columns: 1fr; }
  .btn-lg, .cta-row .btn { width: 100%; }
  .plan { padding: 36px 28px 28px; }
  .price b { font-size: 48px; }
  .platform { padding: 32px 28px; }
  .mini { padding: 28px; }
  .legal table { font-size: 14px; }
  .legal .toc { padding: 22px 24px; }
  .faq summary { padding: 24px 36px 24px 0; font-size: 17px; }
  .frame video { border-radius: 12px; }
  .compare th, .compare td { padding: 14px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .menu, .more svg, .step { transition: none; }
}

/* 联系我们表单 */
.fb-form { display: grid; gap: 24px; margin-top: 8px; text-align: left; }
.fb-form label { display: grid; gap: 10px; font-weight: 550; font-size: 15px; }
.fb-form select, .fb-form textarea, .fb-form input[type="email"], .fb-form input[type="text"] { width: 100%; font: 400 16px/1.5 var(--font); color: var(--text); background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; }
.fb-form textarea { resize: vertical; min-height: 160px; }
.fb-form select:focus, .fb-form textarea:focus, .fb-form input:focus { outline: 2px solid var(--btn); outline-offset: 1px; }
.fb-form .hint { font-weight: 400; font-size: 13.5px; color: var(--muted); }
.fb-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.fb-form .btn { justify-self: start; }
.fb-status { min-height: 1.5em; margin: 0; font-size: 15px; }
.fb-status.ok { color: #1f9d55; }
.fb-status.bad { color: #d92d20; }

/* ===== 通透感：浅蓝光晕背景 + iOS 式磨砂玻璃 + 蓝色点缀 ===== */
:root {
  --glass: rgba(255, 255, 255, 0.58);
  --glass-strong: rgba(255, 255, 255, 0.78);
  --glass-line: rgba(255, 255, 255, 0.85);
  --glass-blur: saturate(180%) blur(28px);
  --glass-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 0 0 1px rgba(20, 60, 140, 0.07), 0 24px 56px -28px rgba(31, 111, 235, 0.35);
  --tint: rgba(31, 111, 235, 0.09);
  --alt: transparent;
}
/* 固定在背后的柔和蓝色光晕：玻璃有东西可糊 */
body::before { content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(52% 46% at 12% -4%, rgba(70, 140, 255, 0.26), transparent 70%),
    radial-gradient(46% 42% at 92% 8%, rgba(120, 190, 255, 0.28), transparent 72%),
    radial-gradient(60% 50% at 78% 62%, rgba(90, 120, 255, 0.12), transparent 72%),
    radial-gradient(60% 46% at 8% 92%, rgba(60, 160, 255, 0.16), transparent 72%); }

.menu { background: var(--glass-strong); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); border: 1px solid var(--glass-line); box-shadow: var(--glass-shadow); }
.menu .tile { background: var(--tint); color: var(--btn); }
.btn-ghost { background: var(--glass); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); border-color: var(--glass-line); box-shadow: 0 0 0 1px rgba(20, 60, 140, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.9); }
.btn-ghost:hover { background: var(--glass-strong); }
.btn-primary { box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 10px 24px -10px rgba(31, 111, 235, 0.65); }

/* 首屏 */
.hero::after { content: ""; position: absolute; left: 50%; top: 120px; width: min(900px, 90vw); height: 420px; transform: translateX(-50%); z-index: -1; pointer-events: none; background: radial-gradient(closest-side, rgba(60, 130, 255, 0.22), transparent); }
.eyebrow { color: var(--btn); font-weight: 550; padding: 8px 16px; border-radius: 999px; background: var(--glass); border: 1px solid var(--glass-line); box-shadow: 0 0 0 1px rgba(31, 111, 235, 0.12); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); }
.mark, .hero .mark { color: var(--btn); }
.hero-stage .frame { padding: 14px; border-radius: 30px; background: rgba(255, 255, 255, 0.72); border: 1px solid var(--glass-line); box-shadow: var(--glass-shadow); }
.hero-stage .frame video { border-radius: 18px; }

/* 功能展示 */
.idx { color: var(--btn); font-weight: 600; }
.panel { background: rgba(255, 255, 255, 0.72); border: 1px solid var(--glass-line); box-shadow: var(--glass-shadow); }
.tab { border-left-color: rgba(31, 111, 235, 0.16); }
.tab.is-active { border-color: var(--btn); }
.tab.is-active b { color: var(--text); }
.tab:hover b { color: var(--btn); }
.tag { background: var(--tint); color: var(--btn); font-weight: 600; }
.more { color: var(--btn); }
.more svg { opacity: 1; }

/* 价格 / 二级页卡片 */
.plan, .mini, .table-wrap { background: var(--glass); border: 1px solid var(--glass-line); box-shadow: var(--glass-shadow); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); }
.plan.featured { background: var(--glass-strong); border-color: rgba(31, 111, 235, 0.55); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.95), 0 0 0 1px rgba(31, 111, 235, 0.35), 0 34px 70px -30px rgba(31, 111, 235, 0.5); }
.plan .badge { background: var(--btn); color: #fff; }
.plan li svg { color: var(--btn); }
.callout { background: var(--tint); }
.chips li { background: var(--glass); border: 1px solid var(--glass-line); box-shadow: 0 0 0 1px rgba(20, 60, 140, 0.06); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); }
.compare .yes { color: var(--btn); }
.legal .toc { background: var(--glass); border: 1px solid var(--glass-line); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); }
.steps li::before { background: var(--tint); color: var(--btn); }
.js .step.is-active { border-color: var(--btn); }
.faq summary::after { color: var(--btn); }
.site-footer { background: var(--glass); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); border-top-color: var(--glass-line); }
.band img { box-shadow: 0 20px 50px -18px rgba(31, 111, 235, 0.6); }

body { background: transparent; }
/* 面板背后一团蓝色光，磨砂玻璃才看得出「透」 */
.showcase { position: relative; }
.showcase::before { content: ""; position: absolute; right: -8%; top: -12%; width: 62%; height: 128%; z-index: -1; pointer-events: none; background: radial-gradient(closest-side, rgba(70, 140, 255, 0.34), rgba(120, 180, 255, 0.12) 60%, transparent); }
@media (max-width: 960px) { .showcase::before { right: -20%; width: 100%; top: -4%; height: 60%; } }
/* 下拉菜单在带模糊的顶栏里，backdrop-filter 糊不到页面（嵌套的 backdrop root），所以用近乎不透明的底，免得背后的字透出来 */
.menu { background: #fff; -webkit-backdrop-filter: none; backdrop-filter: none; border: 1px solid rgba(20, 60, 140, 0.16); box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.8) inset, 0 28px 70px -22px rgba(20, 50, 120, 0.38), 0 8px 20px -10px rgba(20, 50, 120, 0.18); }
.menu a.entry:hover, .menu a.plain:hover { background: var(--tint); }


/* ===== 动效：交叉淡入的画面、功能展开、首屏入场、卡片悬停 ===== */
.panel .frame video.buf { position: absolute; left: 0; top: 0; }
.js .panel .frame video { opacity: 0; transition: opacity 0.5s ease; }
.js .panel .frame video.on { opacity: 1; }
.tab b { transition: color 0.3s ease; }
.plan, .mini { transition: transform 0.45s cubic-bezier(0.22, 0.8, 0.2, 1), box-shadow 0.45s ease; }
.plan:hover, .mini:hover { transform: translateY(-4px); }
.btn { transition: background-color 0.25s ease, transform 0.35s cubic-bezier(0.22, 0.8, 0.2, 1), box-shadow 0.35s ease; }
.btn-primary:hover { box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 14px 30px -10px rgba(31, 111, 235, 0.75); }
.faq summary::after { transition: transform 0.35s cubic-bezier(0.22, 0.8, 0.2, 1); }
.faq details[open] summary::after { transform: translateY(-50%) rotate(180deg); }

@media (prefers-reduced-motion: no-preference) {
  @keyframes hero-in { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
  .hero .eyebrow, .hero h1, .hero .lead, .hero .cta-row, .hero .fine { animation: hero-in 1s cubic-bezier(0.22, 0.8, 0.2, 1) both; }
  .hero h1 { animation-delay: 0.08s; }
  .hero .lead { animation-delay: 0.2s; }
  .hero .cta-row { animation-delay: 0.32s; }
  .hero .fine { animation-delay: 0.42s; }
  @keyframes hero-stage-in { from { opacity: 0; transform: translateY(40px) scale(0.97); } to { opacity: 1; transform: none; } }
  .hero-stage { animation: hero-stage-in 1.3s 0.4s cubic-bezier(0.22, 0.8, 0.2, 1) both; }
}
.page-head .platform p { text-align: left; max-width: none; margin-left: 0; margin-right: 0; font-size: 15px; line-height: 1.6; }
.page-head .platform p.req { margin-top: 8px; font-size: 14.5px; }
.platform .alt-link { margin-top: 22px; font-size: 15px; font-weight: 550; color: var(--btn); }
.platform .alt-link:hover { text-decoration: underline; }
.platform .alt-link + .platform-note { margin-top: 8px; }
.page-head.dl { padding-bottom: 168px; }
.page-head .dl-foot { max-width: 36em; margin: 72px auto 0; font-size: 14.5px; line-height: 1.7; color: var(--muted); }
.page-head .dl-foot a { color: var(--btn); }

/* 博客文章 */
.post h2 { margin-top: 48px; }
.post h3 { font-size: 19px; letter-spacing: -0.015em; margin-top: 32px; }
.post ol { margin-top: 16px; padding-left: 24px; list-style: decimal; }
.post ol li::marker { color: var(--muted); }
.post code { font: 500 0.9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--soft); padding: 2px 6px; border-radius: 6px; }
.post pre { margin-top: 20px; padding: 18px 20px; background: var(--soft); border-radius: 14px; overflow-x: auto; font-size: 14px; line-height: 1.6; }
.post pre code { background: none; padding: 0; }
.post blockquote { margin: 24px 0 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--line); color: var(--muted); }
.post .step-media { margin-top: 28px; }
.post .crumbs { font-size: 14px; margin-bottom: 20px; }
.post .related-h { margin-top: 80px; }
.postlist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 28px; }
.post-card { display: block; color: inherit; transition: transform 0.2s; }
.post-card:hover { text-decoration: none; transform: translateY(-2px); }
.post-card h3 { margin-top: 0; }
.post-date { display: block; margin-top: 18px; color: var(--muted); font-size: 14px; }
@media (max-width: 760px) { .postlist { grid-template-columns: 1fr; } }

/* 语言切换 */
.lang-menu .nav-trigger { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
.lang-menu .nav-trigger svg:first-child { width: 16px; height: 16px; }
.lang-menu .menu { left: auto; right: 0; min-width: 190px; }
.lang-menu .menu a[aria-current="true"] { font-weight: 600; }
.mobile-langs { display: flex; flex-wrap: wrap; gap: 8px 14px; padding: 4px 0 12px; }
.mobile-langs a { font-size: 15px; }
.mobile-langs a[aria-current="true"] { font-weight: 600; }
.foot-langs { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 14px; }
.foot-langs a { color: var(--muted); }
.foot-langs a[aria-current="true"] { color: var(--text); font-weight: 600; }
.foot-legal-note { margin-top: 10px; font-size: 13px; color: var(--muted); }
@media (max-width: 980px) { .lang-menu { display: none; } }

/* CJK：标题 / 导语按词组断行（日语用 auto-phrase，不支持的浏览器退回默认），并让多行标题长短均衡 */
:lang(ja) :is(h1, h2, h3, .lead), :lang(zh-Hans) :is(h1, h2, h3), :lang(zh-Hant) :is(h1, h2, h3), :lang(ko) :is(h1, h2, h3, .lead) { word-break: auto-phrase; text-wrap: balance; line-break: strict; }
:lang(ko) :is(h1, h2, h3, p, li) { word-break: keep-all; }

.post-cover { display: block; width: 100%; height: auto; border-radius: 16px; margin-top: 28px; }
.post-fig { margin: 28px 0 0; }
.post-fig img { display: block; width: 100%; height: auto; border-radius: 14px; border: 1px solid var(--line); }
/* 正文中间自己生成的文章配图：上下都留白，和演示嵌入区分开 */
.post-fig.post-inline { margin: 28px 0; }
.post-thumb { display: block; width: 100%; height: auto; border-radius: 12px; margin-bottom: 18px; }