/* InSnap 官网样式（极简、画面优先）：无框架、无外部字体、无脚本。颜色走 token，深色靠 prefers-color-scheme。
   下拉菜单 / 移动端菜单都是纯 CSS（:hover / :focus-within / checkbox）。 */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --alt: #f6f6f8;
  --card: #ffffff;
  --text: #0a0a0f;
  --muted: #5d6070;
  --line: rgba(10, 10, 15, 0.1);
  --link: #0a5bd6;
  --btn: #0b6bff;
  --btn-hover: #0557d8;
  --on-btn: #ffffff;
  --soft: rgba(11, 107, 255, 0.09);
  --ok: #138a3d;
  --warn-bg: #fff7e0;
  --warn-line: #f0d78a;
  --shadow: 0 1px 2px rgba(10, 10, 15, 0.05), 0 28px 70px -30px rgba(10, 10, 40, 0.45);
  --shadow-sm: 0 1px 2px rgba(10, 10, 15, 0.06), 0 10px 28px -14px rgba(10, 10, 40, 0.3);
  --maxw: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #08080c;
    --alt: #0f0f15;
    --card: #14141c;
    --text: #f5f5f8;
    --muted: #9b9eb0;
    --line: rgba(255, 255, 255, 0.12);
    --link: #6cb2ff;
    --btn: #1473ff;
    --btn-hover: #3a8aff;
    --soft: rgba(108, 178, 255, 0.15);
    --ok: #4cc777;
    --warn-bg: #2a2412;
    --warn-line: #5b4d1c;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 30px 70px -26px rgba(0, 0, 0, 0.9);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5), 0 10px 28px -14px rgba(0, 0, 0, 0.8);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 17px/1.55 var(--font); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img, svg { 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: 8px; }
h1, h2, h3, h4 { line-height: 1.08; letter-spacing: -0.035em; margin: 0; font-weight: 700; 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 28px; }
.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: 8px; }
.grad { background: linear-gradient(100deg, #0b6bff, #7a5cff 60%, #c04bff); -webkit-background-clip: text; background-clip: text; color: transparent; -webkit-text-fill-color: transparent; }
@media (prefers-color-scheme: dark) { .grad { background-image: linear-gradient(100deg, #5aa2ff, #a08cff 60%, #e07bff); } }

/* ===== 顶栏 ===== */
.site-header { position: sticky; top: 0; z-index: 90; background: color-mix(in srgb, var(--bg) 85%, transparent); -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; gap: 8px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 750; font-size: 19px; letter-spacing: -0.03em; margin-right: 20px; }
.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: 10px; color: var(--text); font-size: 15px; font-weight: 550; background: none; border: 0; cursor: pointer; }
.nav > a:hover, .nav-item:hover > .nav-trigger, .nav-item:focus-within > .nav-trigger { background: var(--soft); text-decoration: none; }
.nav > a[aria-current="page"] { background: var(--soft); }
.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: 10px; margin-top: 6px; background: var(--card); border: 1px solid var(--line); border-radius: 20px; 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: 14px; color: var(--text); }
.menu a.entry:hover, .menu a.plain:hover { background: var(--soft); text-decoration: none; }
.menu .tile { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow-sm); color: var(--btn); }
.menu .tile svg { width: 22px; height: 22px; }
.menu .entry b { display: block; font-size: 15px; 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: 550; }
.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: 10px; }
.burger { display: none; width: 42px; height: 42px; border-radius: 10px; 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: 10px 20px 22px; }
.mobile-menu h4 { font-size: 12.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); margin: 16px 8px 6px; }
.mobile-menu a { display: flex; gap: 12px; align-items: center; padding: 12px 8px; color: var(--text); font-size: 17px; font-weight: 550; border-radius: 10px; }
.mobile-menu a svg { width: 22px; height: 22px; color: var(--btn); }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 24px; border-radius: 999px; font: 650 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: var(--line); }
.btn-ghost:hover { background: var(--alt); }
.btn-sm { height: 38px; padding: 0 16px; font-size: 14.5px; }
.btn-block { width: 100%; }
.btn-lg { height: 54px; padding: 0 30px; font-size: 17px; }
.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: 12px; justify-content: center; margin-top: 32px; }
.fine { font-size: 14px; color: var(--muted); margin-top: 18px; }

/* ===== 首屏 ===== */
.hero { padding: 88px 0 0; text-align: center; }
.hero h1 { font-size: clamp(44px, 7.4vw, 92px); letter-spacing: -0.05em; line-height: 1; }
.hero .lead { font-size: clamp(19px, 2.2vw, 24px); color: var(--muted); max-width: 30em; margin: 26px auto 0; text-wrap: balance; }
.hero-media { margin-top: 72px; max-width: 1120px; }

/* 真实操作动图的外框 */
.media { margin: 0; border-radius: 18px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow); background: var(--alt); }
.media img { width: 100%; height: auto; }

/* ===== 功能行：左文右图 / 左图右文 ===== */
.row { padding: 120px 0 0; }
.row-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: 72px; align-items: center; }
.row.flip .row-grid { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }
.row.flip .row-text { order: 2; }
.row-text .num { display: block; font-size: 15px; font-weight: 700; color: var(--muted); letter-spacing: 0.04em; font-variant-numeric: tabular-nums; }
.row-text .kicker { display: inline-block; margin-top: 18px; font-size: 13px; font-weight: 750; letter-spacing: 0.08em; text-transform: uppercase; color: var(--link); }
.row-text h2 { font-size: clamp(32px, 4vw, 52px); margin-top: 10px; }
.row-text p { color: var(--muted); font-size: 19px; margin-top: 18px; }
.tag { display: inline-block; vertical-align: middle; margin-left: 10px; padding: 2px 9px; font-size: 12px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--link); background: var(--soft); border-radius: 999px; }

/* 小图 */
.tiles-sec { padding: 140px 0 0; text-align: center; }
.tiles-sec h2 { font-size: clamp(32px, 4.4vw, 56px); }
.tiles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 32px; margin-top: 56px; }
.tile .media { transition: transform 0.2s; }
.tile:hover .media { transform: translateY(-4px); }
.tile p { margin-top: 16px; font-size: 17px; font-weight: 650; }

/* ===== 价格 ===== */
.pricing-sec { padding: 140px 0 0; text-align: center; }
.pricing-sec h2 { font-size: clamp(32px, 4.4vw, 56px); }
.pricing-sec .sub { color: var(--muted); font-size: 19px; margin: 16px auto 0; max-width: 34em; }
.pricing-sec .plans, .pricing-sec .plan { text-align: left; }
.pricing-sec .plans { margin-top: 56px; }
.pricing-sec .container.one { max-width: 480px; }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 26px; padding: 34px 30px 30px; }
.plan.featured { color: #fff; border: 0; background: linear-gradient(160deg, #0d1c45, #090f26); box-shadow: 0 30px 70px -30px rgba(20, 50, 160, 0.8); }
.plan.featured .for, .plan.featured .price span, .plan.featured .price-alt, .plan.featured .note { color: rgba(255, 255, 255, 0.72); }
.plan.featured ul { border-top-color: rgba(255, 255, 255, 0.16); }
.plan.featured li svg { color: #7fd8a0; }
.plan.featured .btn-primary { background: #fff; color: #0a2a66; }
.plan.featured .btn-primary:hover { background: #eaf2ff; }
.plan.featured .btn-disabled { background: rgba(255, 255, 255, 0.14); color: rgba(255, 255, 255, 0.8); border-color: rgba(255, 255, 255, 0.2); }
.plan .badge { position: absolute; top: 20px; right: 20px; background: linear-gradient(100deg, #ffb340, #ff7a59); color: #2a1200; font-size: 12px; font-weight: 750; padding: 5px 12px; border-radius: 999px; }
.plan h3 { font-size: 22px; letter-spacing: -0.02em; }
.plan .for { color: var(--muted); font-size: 15px; margin-top: 8px; min-height: 46px; }
.price { margin-top: 20px; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.price b { font-size: 54px; 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: 10px; min-height: 24px; }
.plan .btn { margin-top: 22px; }
.plan .note { font-size: 13.5px; color: var(--muted); margin-top: 12px; text-align: center; }
.plan ul { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); display: grid; gap: 11px; font-size: 15.5px; }
.plan li { display: flex; gap: 10px; }
.plan li svg { width: 19px; height: 19px; flex: none; margin-top: 3px; color: var(--ok); }
.plan li.muted { opacity: 0.75; }
.cap { text-align: center; margin-top: 28px; font-size: 15px; color: var(--muted); }

/* ===== CTA / 页脚 ===== */
.band { padding: 140px 0 120px; text-align: center; }
.band img { width: 72px; height: 72px; border-radius: 18px; margin: 0 auto 28px; }
.band h2 { font-size: clamp(34px, 5vw, 60px); max-width: 14em; margin: 0 auto; }
.site-footer { border-top: 1px solid var(--line); background: var(--alt); padding: 64px 0 36px; font-size: 15px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: 32px; }
.foot-grid h4 { margin: 0 0 14px; font-size: 12.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); }
.foot-grid li { margin: 10px 0; }
.foot-grid a { color: var(--text); opacity: 0.86; }
.foot-note { color: var(--muted); margin-top: 14px; max-width: 24em; }
.foot-bottom { margin-top: 44px; padding-top: 22px; 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 ===== */
.page-head { padding: 88px 0 56px; text-align: center; }
.page-head h1 { font-size: clamp(38px, 6vw, 68px); letter-spacing: -0.045em; max-width: 14em; margin: 0 auto; }
.page-head p { color: var(--muted); font-size: 21px; max-width: 34em; margin: 18px auto 0; text-wrap: balance; }
.page-head .picon { width: 64px; height: 64px; border-radius: 18px; margin: 0 auto 24px; display: grid; place-items: center; background: var(--alt); border: 1px solid var(--line); color: var(--btn); }
.page-head .picon svg { width: 32px; height: 32px; }
.page-head.lg { padding: 140px 0; }
.pill { display: inline-block; padding: 5px 14px; border-radius: 999px; background: var(--soft); color: var(--link); font-size: 13px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 18px; }
.section { padding: 96px 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 48px; }
.section-head h2 { font-size: clamp(30px, 4vw, 46px); }
.section-head p { font-size: 19px; color: var(--muted); margin-top: 14px; }
.faq-sec { padding: 120px 0 0; }
.faq-sec h2 { text-align: center; font-size: clamp(30px, 4vw, 46px); margin-bottom: 40px; }
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 10px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 0 24px; }
.faq summary { cursor: pointer; list-style: none; padding: 20px 36px 20px 0; font-size: 17.5px; font-weight: 650; 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%); width: 26px; height: 26px; border-radius: 50%; background: var(--soft); color: var(--link); display: grid; place-items: center; font-size: 19px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq .ans { padding: 0 0 22px; color: var(--muted); font-size: 16px; }
.faq .ans p + p { margin-top: 12px; }
.buying { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.mini { background: var(--card); border: 1px solid var(--line); border-radius: 22px; padding: 28px; }
.mini h3 { font-size: 19px; letter-spacing: -0.015em; }
.mini p { color: var(--muted); font-size: 16px; margin-top: 10px; }
.callout { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 16px; padding: 18px 22px; font-size: 16px; }
.callout.mt { margin-top: 22px; }
.callout.box { max-width: 660px; margin: 24px auto 0; text-align: left; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; background: var(--card); }
table.compare { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 15.5px; }
.compare th, .compare td { padding: 14px 20px; 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: 15px; background: var(--alt); }
.compare tbody tr:last-child td { border-bottom: 0; }
.compare .yes { color: var(--ok); font-weight: 800; font-size: 18px; }
.compare .no { color: var(--muted); }
.compare .grp td { background: var(--alt); font-weight: 700; font-size: 12.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); text-align: left; }
.steps { counter-reset: s; display: grid; gap: 12px; max-width: 760px; margin: 0 auto; }
.steps li { counter-increment: s; display: flex; gap: 16px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px; }
.steps li::before { content: counter(s); flex: none; width: 32px; height: 32px; border-radius: 50%; background: var(--btn); color: var(--on-btn); font-weight: 700; font-size: 15px; display: grid; place-items: center; }
.steps b { display: block; font-size: 17px; }
.steps span { color: var(--muted); font-size: 15.5px; }
.perm { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.perm th, .perm td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
.perm th { background: var(--alt); font-size: 14px; }
.stack { display: grid; gap: 14px; }
.narrow .section-head { max-width: none; }

/* ===== 法律文本 ===== */
.legal { padding: 40px 0 112px; }
.legal h1 { font-size: clamp(36px, 5vw, 52px); letter-spacing: -0.04em; }
.legal .meta { color: var(--muted); margin-top: 12px; font-size: 15px; }
.legal .intro { margin-top: 26px; font-size: 18px; }
.legal .toc { margin: 30px 0 8px; padding: 18px 22px; background: var(--alt); border: 1px solid var(--line); border-radius: 16px; font-size: 15px; columns: 2; column-gap: 32px; }
.legal .toc a { display: block; padding: 4px 0; break-inside: avoid; }
.legal h2 { font-size: 24px; margin-top: 48px; letter-spacing: -0.02em; scroll-margin-top: 90px; }
.legal p { margin-top: 14px; }
.legal ul { margin-top: 12px; padding-left: 22px; list-style: disc; }
.legal li { margin-top: 8px; }
.legal li::marker { color: var(--muted); }
.legal table { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 15px; }
.legal th, .legal td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.legal th { background: var(--alt); font-weight: 600; }

/* ===== 响应式 ===== */
@media (max-width: 1040px) {
  .nav { display: none; }
  .burger { display: grid; }
  .nav-toggle:checked ~ .mobile-menu { display: block; }
  .header-end .btn { display: none; }
}
@media (max-width: 960px) {
  .row { padding-top: 80px; }
  .row-grid, .row.flip .row-grid { grid-template-columns: 1fr; gap: 32px; }
  .row.flip .row-text { order: 0; }
  .plans, .buying { grid-template-columns: 1fr; }
  .plan .for { min-height: 0; }
  .tiles { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .legal .toc { columns: 1; }
  .tiles-sec, .pricing-sec { padding-top: 96px; }
  .band { padding: 96px 0 80px; }
  .section { padding: 72px 0; }
}
@media (max-width: 520px) {
  body { font-size: 16.5px; }
  .container { padding: 0 18px; }
  .hero { padding-top: 56px; }
  .hero-media { margin-top: 44px; }
  .foot-grid { grid-template-columns: 1fr; }
  .btn-lg, .cta-row .btn { width: 100%; }
  .plan { padding: 28px 22px; }
  .price b { font-size: 46px; }
  .media { border-radius: 12px; }
  .legal table { font-size: 14px; }
  .faq details { padding: 0 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .menu, .tile .media { transition: none; }
}