:root {
  --ink: #132238;
  --muted: #5c6b7f;
  --paper: #f7f9fc;
  --surface: #ffffff;
  --line: #dce3ec;
  --brand: #2563eb;
  --brand-dark: #1746b3;
  --brand-soft: #eaf1ff;
  --cyan: #0891b2;
  --success: #0f9f6e;
  --navy: #071b35;
  --shadow: 0 22px 50px rgba(28, 54, 91, 0.12);
  --shadow-sm: 0 10px 25px rgba(28, 54, 91, 0.08);
  --radius: 22px;
  --radius-sm: 14px;
  --content: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 0 0, rgba(37, 99, 235, .12), transparent 34rem),
    radial-gradient(circle at 100% 25%, rgba(8, 145, 178, .09), transparent 30rem),
    linear-gradient(180deg, #fbfdff 0, var(--paper) 38rem);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
.container { width: min(calc(100% - 40px), var(--content)); margin-inline: auto; }
.narrow { width: min(calc(100% - 40px), 820px); margin-inline: auto; }
.section { padding: 92px 0; }
.section-sm { padding: 64px 0; }
.surface-section { background: rgba(255, 255, 255, .74); border-block: 1px solid rgba(220, 227, 236, .8); }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 9999; padding: 10px 14px; background: var(--navy); color: #fff; border-radius: 10px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(251, 253, 255, .86);
  border-bottom: 1px solid rgba(220, 227, 236, .76);
  backdrop-filter: blur(18px) saturate(145%);
}
.header-inner { min-height: 72px; display: flex; align-items: center; gap: 26px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 850; letter-spacing: -.02em; color: #081a33; white-space: nowrap; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 25px; }
.site-nav a { color: #445268; font-size: .95rem; font-weight: 650; transition: color .2s; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--brand); }
.header-online { display: inline-flex; align-items: center; justify-content: center; padding: 10px 18px; border-radius: 999px; background: var(--brand); color: #fff !important; }
.header-online:hover { background: var(--brand-dark); }
.header-cta { display: inline-flex; align-items: center; justify-content: center; padding: 10px 18px; background: var(--navy); color: #fff !important; border-radius: 999px; }
.menu-toggle { display: none; margin-left: auto; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); font-size: 1.25rem; cursor: pointer; }

.hero { padding: 92px 0 82px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(400px, .98fr); gap: 64px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 18px; padding: 7px 12px; border: 1px solid #cfe0ff; border-radius: 999px; color: var(--brand-dark); background: rgba(234, 241, 255, .78); font-size: .87rem; font-weight: 750; }
.eyebrow::before { content: ""; width: 7px; height: 7px; background: var(--brand); border-radius: 50%; box-shadow: 0 0 0 5px rgba(37, 99, 235, .12); }
h1, h2, h3 { margin-top: 0; color: #0b1b32; line-height: 1.2; letter-spacing: -.035em; }
h1 { margin-bottom: 24px; font-size: clamp(2.55rem, 5vw, 4.7rem); }
.inner-hero h1 { font-size: clamp(2.35rem, 4.4vw, 4.2rem); }
h2 { margin-bottom: 18px; font-size: clamp(1.9rem, 3.2vw, 3rem); }
h3 { margin-bottom: 10px; font-size: 1.2rem; }
.gradient-text { color: var(--brand); background: linear-gradient(110deg, #1746b3 0, #2563eb 46%, #0891b2 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-copy { max-width: 650px; margin: 0 0 30px; color: var(--muted); font-size: 1.12rem; }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 13px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 50px; padding: 0 23px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); color: var(--ink); font-weight: 750; box-shadow: 0 5px 15px rgba(21, 43, 74, .05); transition: transform .2s, box-shadow .2s, border-color .2s, background .2s; }
.btn:hover { transform: translateY(-2px); border-color: #a9b8cb; box-shadow: var(--shadow-sm); }
.btn-primary { border-color: var(--brand); background: var(--brand); color: #fff; }
.btn-primary:hover { border-color: var(--brand-dark); background: var(--brand-dark); }
.btn-dark { border-color: var(--navy); background: var(--navy); color: #fff; }
.btn-sm { min-height: 43px; padding-inline: 17px; font-size: .93rem; }
.btn img { width: 25px; height: 25px; object-fit: contain; }
.trust-row { display: flex; flex-wrap: wrap; gap: 18px; margin: 26px 0 0; color: #58677a; font-size: .92rem; }
.trust-row span::before { content: "✓"; margin-right: 6px; color: var(--success); font-weight: 900; }
.hero-visual { position: relative; }
.hero-visual::before { content: ""; position: absolute; inset: 12% -8% -6% 14%; z-index: -1; border-radius: 42px; background: linear-gradient(145deg, rgba(37, 99, 235, .24), rgba(8, 145, 178, .11)); filter: blur(28px); }
.product-frame { padding: 13px; border: 1px solid rgba(204, 216, 232, .95); border-radius: 24px; background: rgba(255, 255, 255, .94); box-shadow: var(--shadow); transform: rotate(1deg); }
.product-frame img { width: 100%; height: auto; border-radius: 15px; }
.floating-note { position: absolute; right: -18px; bottom: -26px; max-width: 230px; padding: 15px 17px; background: #fff; border: 1px solid var(--line); border-radius: 15px; box-shadow: var(--shadow-sm); font-size: .88rem; color: var(--muted); }
.floating-note strong { display: block; color: var(--ink); font-size: .96rem; }

.section-head { max-width: 720px; margin-bottom: 42px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head p, .lead { margin: 0; color: var(--muted); font-size: 1.08rem; }
.kicker { display: block; margin-bottom: 9px; color: var(--brand); font-size: .82rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.grid-2, .grid-3, .grid-4 { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { height: 100%; padding: 29px; background: rgba(255, 255, 255, .92); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 22px rgba(28, 54, 91, .045); }
.card p { margin: 0; color: var(--muted); }
.card ul { margin-bottom: 0; }
.icon-tile { width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: 18px; border-radius: 14px; background: var(--brand-soft); color: var(--brand); font-size: 1.35rem; font-weight: 850; }
.icon-image { width: 48px; height: 48px; object-fit: contain; margin-bottom: 18px; }
.stat-strip { display: grid; grid-template-columns: repeat(4, 1fr); overflow: hidden; margin-top: 56px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255, 255, 255, .92); box-shadow: var(--shadow-sm); }
.stat { padding: 24px; text-align: center; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat strong { display: block; color: #0b1b32; font-size: 1.75rem; line-height: 1.15; }
.stat span { color: var(--muted); font-size: .89rem; }

.browser-card { position: relative; padding: 26px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.browser-card > img { width: 50px; height: 50px; object-fit: contain; margin-bottom: 16px; }
.browser-card h3 { margin-bottom: 4px; }
.browser-card p { min-height: 52px; margin: 0 0 18px; color: var(--muted); font-size: .92rem; }
.browser-card .btn { width: 100%; }
.recommended { position: absolute; top: 14px; right: 14px; padding: 4px 8px; border-radius: 999px; background: #eaf8f2; color: #087856; font-size: .72rem; font-weight: 800; }

.download-hero { padding: 30px 0 54px; background: linear-gradient(180deg, transparent, rgba(255, 255, 255, .78)); border-bottom: 1px solid rgba(220, 227, 236, .8); }
.download-intro { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 54px; align-items: end; }
.download-intro h1 { margin-bottom: 0; font-size: clamp(2.4rem, 4vw, 3.65rem); }
.download-intro .hero-copy { margin: 0 0 14px; font-size: 1.03rem; }
.download-intro .trust-row { margin-top: 0; gap: 14px; }
.download-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin: 30px 0 17px; }
.download-heading .kicker { margin-bottom: 3px; }
.download-heading h2 { margin-bottom: 0; font-size: clamp(1.5rem, 2.3vw, 2.05rem); }
.download-heading p { margin: 0 0 2px; color: var(--muted); font-size: .92rem; }
.download-grid { gap: 16px; }
.download-page .browser-card { padding: 20px; }
.download-page .browser-card > img { width: 44px; height: 44px; margin-bottom: 11px; }
.download-page .browser-card p { min-height: 44px; margin-bottom: 14px; font-size: .86rem; line-height: 1.55; }
.download-page .browser-card .btn { min-height: 44px; padding-inline: 14px; font-size: .91rem; }

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { position: relative; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.step::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 19px; border-radius: 50%; background: var(--navy); color: #fff; font-weight: 850; }
.step p { margin: 0; color: var(--muted); }
.callout { padding: 28px 30px; border: 1px solid #c8d9f4; border-radius: var(--radius); background: linear-gradient(135deg, #f0f5ff, #f4fbfd); }
.callout strong { color: var(--ink); }
.check-list { padding: 0; margin: 22px 0 0; list-style: none; }
.check-list li { position: relative; padding-left: 29px; margin: 10px 0; color: #445268; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 1px; width: 20px; height: 20px; display: grid; place-items: center; border-radius: 50%; background: #e7f8f1; color: var(--success); font-size: .74rem; font-weight: 900; }
.comparison { width: 100%; border-collapse: separate; border-spacing: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.comparison th, .comparison td { padding: 15px 17px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison th { background: #edf3fb; color: #1a2d48; font-size: .92rem; }
.comparison tr:last-child td { border-bottom: 0; }
.comparison td { color: #536277; }

.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-button { width: 100%; display: flex; justify-content: space-between; gap: 20px; padding: 22px 0; border: 0; background: transparent; color: var(--ink); text-align: left; font: inherit; font-weight: 750; cursor: pointer; }
.faq-button::after { content: "+"; flex: 0 0 auto; color: var(--brand); font-size: 1.45rem; line-height: 1; transition: transform .2s; }
.faq-button[aria-expanded="true"]::after { transform: rotate(45deg); }
.faq-panel { padding: 0 42px 20px 0; color: var(--muted); }
.faq-panel[hidden] { display: none; }

.inner-hero { padding: 78px 0 65px; }
.inner-hero .hero-grid { grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 20px 0 0; color: var(--muted); font-size: .88rem; }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span::before { content: "/"; margin-right: 8px; color: #9ba8b8; }
.mini-panel { padding: 27px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-sm); }
.mini-panel p { color: var(--muted); }
.mini-panel p:last-child { margin-bottom: 0; }
.article { font-size: 1.03rem; }
.article h2 { margin-top: 58px; }
.article h3 { margin-top: 34px; }
.article p, .article li { color: #445268; }
.article figure { margin: 34px 0; }
.article figure img { border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow-sm); }
.article figcaption { margin-top: 9px; color: var(--muted); font-size: .87rem; text-align: center; }
.toc { margin: 30px 0; padding: 24px 27px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); }
.toc strong { display: block; margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 22px; }
.toc a { color: var(--brand-dark); }
.code-label { display: inline-block; padding: 3px 8px; border-radius: 6px; background: #edf3fb; color: #334965; font-size: .88rem; }

.final-cta { position: relative; overflow: hidden; padding: 76px 0; background: var(--navy); color: #dbe7f7; }
.final-cta::after { content: ""; position: absolute; width: 460px; height: 460px; right: -130px; top: -240px; border-radius: 50%; background: rgba(37, 99, 235, .33); filter: blur(25px); }
.final-cta .container { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.final-cta h2 { margin-bottom: 10px; color: #fff; }
.final-cta p { margin: 0; color: #b6c5d9; }
.final-cta .btn { flex: 0 0 auto; }

.site-footer { padding: 54px 0 28px; background: #041327; color: #95a6bc; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 38px; }
.footer-brand { color: #fff; }
.footer-copy { max-width: 360px; font-size: .91rem; }
.footer-col strong { display: block; margin-bottom: 12px; color: #e8eef7; font-size: .9rem; }
.footer-col a { display: block; margin: 7px 0; font-size: .89rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 25px; margin-top: 40px; padding-top: 22px; border-top: 1px solid #1b2c43; font-size: .82rem; }
.not-found { min-height: 70vh; display: grid; place-items: center; text-align: center; }
.not-found strong { display: block; color: var(--brand); font-size: clamp(5rem, 14vw, 10rem); line-height: 1; }
.not-found p { color: var(--muted); }

@media (max-width: 1080px) {
  .menu-toggle { display: inline-grid; place-items: center; }
  .site-nav { position: fixed; inset: 72px 20px auto; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px; border: 1px solid var(--line); border-radius: 17px; background: #fff; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px; }
  .header-online { margin-top: 5px; }
  .header-cta { margin-top: 5px; }
}

@media (max-width: 960px) {
  .hero-grid, .inner-hero .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { width: min(100%, 650px); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .download-intro { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 680px) {
  .container, .narrow { width: min(calc(100% - 30px), var(--content)); }
  .section { padding: 68px 0; }
  .section-sm { padding: 48px 0; }
  .hero, .inner-hero { padding: 61px 0 55px; }
  h1 { font-size: clamp(2.35rem, 12vw, 3.3rem); }
  .hero-copy { font-size: 1.02rem; }
  .cta-row .btn { width: 100%; }
  .floating-note { position: static; max-width: none; margin-top: 13px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .stat:nth-child(4) { border-top: 1px solid var(--line); }
  .comparison-wrap { overflow-x: auto; }
  .comparison { min-width: 650px; }
  .final-cta .container { align-items: stretch; flex-direction: column; }
  .final-cta .btn { width: 100%; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; }
  .download-hero { padding: 25px 0 44px; }
  .download-intro h1 { font-size: clamp(2.15rem, 10.5vw, 2.8rem); }
  .download-intro .hero-copy { font-size: .97rem; }
  .download-heading { align-items: flex-start; flex-direction: column; gap: 5px; margin: 25px 0 14px; }
  .download-page .browser-card { display: grid; grid-template-columns: 44px minmax(0, 1fr); column-gap: 14px; align-items: center; padding: 17px; }
  .download-page .browser-card > img { grid-row: 1 / 3; margin: 0; }
  .download-page .browser-card h3 { margin: 0; }
  .download-page .browser-card p { min-height: 0; margin: 2px 0 0; }
  .download-page .browser-card .btn { grid-column: 1 / -1; margin-top: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}