:root {
  --blue: #2980FE;
  --blue-deep: #1767D6;
  --blue-soft: #EAF3FF;
  --blue-pale: #F5F8FD;
  --gray-soft: #F7F9FC;
  --white: #FFFFFF;
  --text: #172033;
  --body: #465266;
  --muted: #718096;
  --border: #DCE6F2;
  --footer: #10233F;
  --shadow: 0 18px 55px rgba(31, 84, 150, .11);
  --shadow-soft: 0 10px 30px rgba(31, 84, 150, .08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --container: min(1180px, calc(100% - 40px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--body); background: #fff; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif; line-height: 1.75; overflow-x: hidden; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 9999; background: #fff; color: var(--text); padding: 10px 14px; border-radius: 10px; box-shadow: var(--shadow); }
.skip-link:focus { top: 16px; }
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(220,230,242,.85); backdrop-filter: blur(14px); }
.header-inner { width: var(--container); min-height: 78px; margin: 0 auto; display: grid; grid-template-columns: 182px minmax(0,1fr) auto; align-items: center; gap: 22px; }
.brand img { object-fit: contain; }
.desktop-nav { display: flex; justify-content: center; align-items: stretch; min-width: 0; white-space: nowrap; }
.nav-link { display: inline-flex; align-items: center; min-height: 78px; padding: 0 11px; color: #33425a; font-size: 14px; font-weight: 650; position: relative; }
.nav-link::after { content: ""; position: absolute; left: 13px; right: 13px; bottom: 14px; height: 2px; border-radius: 2px; background: var(--blue); transform: scaleX(0); transition: transform .2s ease; }
.nav-link:hover, .nav-link:focus-visible, .nav-link.is-active { color: var(--blue-deep); }
.nav-link:hover::after, .nav-link:focus-visible::after, .nav-link.is-active::after { transform: scaleX(1); }
.nav-group { position: relative; }
.mega-menu { position: absolute; top: calc(100% - 2px); left: 50%; width: 640px; transform: translate(-50%, 12px); display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 10px; padding: 18px; border: 1px solid var(--border); border-radius: 20px; background: #fff; box-shadow: var(--shadow); opacity: 0; visibility: hidden; pointer-events: none; transition: .2s ease; }
.mega-menu-compact { width: 540px; }
.nav-group:hover .mega-menu, .nav-group:focus-within .mega-menu { opacity: 1; visibility: visible; pointer-events: auto; transform: translate(-50%, 0); }
.mega-menu::before { content: ""; position: absolute; left: 0; right: 0; top: -14px; height: 14px; }
.mega-intro { grid-row: span 2; padding: 18px; border-radius: 16px; background: linear-gradient(145deg, var(--blue-soft), #f8fbff); }
.mega-intro strong { display: block; color: var(--text); font-size: 18px; margin-bottom: 6px; }
.mega-intro span { display: block; color: var(--muted); font-size: 13px; line-height: 1.65; white-space: normal; }
.mega-menu > a { padding: 13px 14px; border-radius: 14px; border: 1px solid transparent; }
.mega-menu > a:hover, .mega-menu > a:focus-visible { background: var(--gray-soft); border-color: var(--border); }
.mega-menu b { display: block; color: var(--text); font-size: 14px; }
.mega-menu small { display: block; color: var(--muted); font-size: 12px; white-space: normal; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.download-btn { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 0 24px; border-radius: 999px; color: #fff; background: linear-gradient(135deg, var(--blue), var(--blue-deep)); font-weight: 750; box-shadow: 0 12px 28px rgba(41,128,254,.22); transition: transform .2s ease, box-shadow .2s ease; }
.download-btn:hover, .download-btn:focus-visible { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(41,128,254,.28); }
.more-btn { width: 48px; height: 48px; display: inline-flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; border: 1px solid var(--border); background: #fff; border-radius: 14px; }
.more-btn span { width: 19px; height: 2px; background: var(--text); border-radius: 2px; }
.menu-overlay { position: fixed; inset: 0; z-index: 1090; background: rgba(16,35,63,.42); opacity: 0; transition: opacity .22s ease; }
.menu-overlay.is-visible { opacity: 1; }
.mobile-menu { position: fixed; top: 0; right: 0; bottom: 0; width: min(440px, 92vw); z-index: 1100; background: #fff; box-shadow: -20px 0 60px rgba(16,35,63,.2); transform: translateX(102%); transition: transform .25s ease; }
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu-head { min-height: 78px; padding: 0 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.menu-close { width: 48px; height: 48px; border: 0; background: var(--gray-soft); border-radius: 14px; color: var(--text); font-size: 30px; line-height: 1; }
.mobile-menu-scroll { height: calc(100% - 78px); overflow-y: auto; padding: 18px 20px 36px; }
.mobile-home, .mobile-menu summary { min-height: 50px; display: flex; align-items: center; color: var(--text); font-weight: 750; border-bottom: 1px solid var(--border); }
.mobile-menu details div { padding: 8px 0 12px 12px; display: grid; gap: 2px; }
.mobile-menu details a { min-height: 44px; display: flex; align-items: center; color: var(--body); }
.mobile-download { width: 100%; margin-top: 22px; }
main { overflow: hidden; }
.section { padding: 92px 0; }
.section-tight { padding: 64px 0; }
.section-soft { background: var(--blue-pale); }
.section-blue { background: linear-gradient(145deg, #0f5fc7, #1f82ee); color: #fff; }
.container { width: var(--container); margin: 0 auto; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 14px; color: var(--blue-deep); font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 26px; height: 2px; background: currentColor; border-radius: 2px; }
h1, h2, h3, h4 { margin: 0; color: var(--text); line-height: 1.25; letter-spacing: -.02em; }
h1 { font-size: clamp(42px, 5.8vw, 72px); }
h2 { font-size: clamp(30px, 3.8vw, 48px); }
h3 { font-size: clamp(20px, 2.3vw, 28px); }
p { margin: 0; }
.lead { font-size: 18px; line-height: 1.85; color: #536079; }
.section-heading { max-width: 780px; margin-bottom: 40px; }
.section-heading.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-heading p { margin-top: 14px; font-size: 17px; color: var(--muted); }
.hero { position: relative; min-height: 690px; display: flex; align-items: center; background: radial-gradient(circle at 88% 20%, rgba(41,128,254,.15), transparent 35%), linear-gradient(180deg, #fff 0%, #f6faff 100%); }
.hero::after { content: ""; position: absolute; width: 420px; height: 420px; right: -180px; bottom: -220px; border-radius: 50%; border: 65px solid rgba(41,128,254,.06); }
.hero-grid { display: grid; grid-template-columns: 1.12fr .88fr; align-items: center; gap: 54px; }
.hero-copy { position: relative; z-index: 2; }
.hero-copy h1 span { color: var(--blue); }
.hero-copy .lead { max-width: 690px; margin-top: 22px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button-secondary, .text-link { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; }
.button-secondary { padding: 0 22px; border-radius: 999px; border: 1px solid var(--border); color: var(--text); background: #fff; font-weight: 750; }
.text-link { color: var(--blue-deep); font-weight: 750; }
.tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.tag { padding: 8px 13px; border-radius: 999px; background: #fff; border: 1px solid var(--border); color: #40506a; font-size: 13px; font-weight: 700; }
.hero-visual { position: relative; min-height: 520px; display: flex; justify-content: center; align-items: center; }
.hero-visual::before { content: ""; position: absolute; width: 390px; height: 390px; border-radius: 50%; background: linear-gradient(145deg, rgba(41,128,254,.22), rgba(234,243,255,.5)); filter: blur(2px); }
.hero-visual img { position: relative; z-index: 2; max-height: 520px; object-fit: contain; filter: drop-shadow(0 34px 45px rgba(34,78,140,.22)); }
.float-note { position: absolute; z-index: 3; padding: 12px 15px; border: 1px solid rgba(220,230,242,.9); border-radius: 15px; background: rgba(255,255,255,.92); box-shadow: var(--shadow-soft); color: var(--text); font-size: 13px; font-weight: 750; }
.note-one { left: 0; top: 18%; }.note-two { right: 0; top: 38%; }.note-three { left: 5%; bottom: 14%; }
.capability-bar { margin-top: -42px; position: relative; z-index: 10; }
.capability-grid { display: grid; grid-template-columns: repeat(4,1fr); background: #fff; border: 1px solid var(--border); border-radius: 24px; box-shadow: var(--shadow); overflow: hidden; }
.capability { padding: 26px; min-height: 170px; }
.capability + .capability { border-left: 1px solid var(--border); }
.capability strong { color: var(--text); font-size: 18px; display: block; margin-bottom: 7px; }
.capability p { font-size: 14px; color: var(--muted); }
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.category-card { min-height: 230px; padding: 28px; border-radius: 22px; background: #fff; border: 1px solid var(--border); box-shadow: 0 10px 24px rgba(31,84,150,.05); display: flex; flex-direction: column; }
.category-card.featured { grid-column: span 2; background: linear-gradient(145deg, #0f6fdf, #2f8cff); color: #fff; }
.category-card.wide { grid-column: span 2; }
.category-card h3 { font-size: 23px; }
.category-card.featured h3, .category-card.featured p, .category-card.featured a { color: #fff; }
.category-card p { margin: 12px 0 22px; color: var(--muted); font-size: 15px; }
.category-card a { margin-top: auto; color: var(--blue-deep); font-weight: 800; }
.category-card:nth-child(3n) { background: #f2f7ff; }
.category-card:nth-child(4n) { border-style: dashed; }
.split-feature { display: grid; grid-template-columns: .9fr 1.1fr; gap: 46px; align-items: center; padding: 34px; border-radius: 28px; background: var(--blue-soft); }
.split-feature.reverse { grid-template-columns: 1.1fr .9fr; }
.feature-image { min-height: 470px; display: flex; align-items: center; justify-content: center; border-radius: 22px; background: #fff; overflow: hidden; }
.feature-image img { max-height: 450px; object-fit: contain; }
.feature-panel { padding: 34px; background: #fff; border-radius: 22px; box-shadow: var(--shadow-soft); }
.feature-panel .lead { margin: 16px 0 24px; }
.check-list { list-style: none; margin: 22px 0 0; padding: 0; display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 30px; color: var(--body); }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 2px; width: 21px; height: 21px; display: inline-flex; justify-content: center; align-items: center; border-radius: 50%; background: var(--blue-soft); color: var(--blue-deep); font-size: 12px; font-weight: 900; }
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: stretch; }
.topic-panel { padding: 36px; border: 1px solid var(--border); border-radius: 24px; background: #fff; }
.topic-panel.offset { transform: translateY(34px); background: var(--blue-pale); }
.topic-panel p { margin: 16px 0 22px; }
.topic-panel .check-list { grid-template-columns: 1fr; }
.media-card { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; border-radius: 26px; overflow: hidden; border: 1px solid var(--border); background: #fff; }
.media-card.large-right { grid-template-columns: .82fr 1.18fr; }
.media-card-copy { padding: 42px; }
.media-card-copy p { margin: 16px 0 24px; }
.media-card-visual { min-height: 410px; background: var(--blue-soft); display: flex; justify-content: center; align-items: center; padding: 28px; }
.media-card-visual img { max-height: 370px; object-fit: contain; }
.security-wrap { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; align-items: center; }
.section-blue h2, .section-blue h3, .section-blue p, .section-blue li { color: #fff; }
.section-blue .eyebrow { color: #cfe5ff; }
.security-alerts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.security-alert { padding: 20px; border-radius: 18px; background: rgba(255,255,255,.11); border: 1px solid rgba(255,255,255,.16); }
.security-alert strong { display: block; margin-bottom: 6px; }
.swap-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 28px; align-items: stretch; }
.swap-visual, .swap-checks { border-radius: 26px; overflow: hidden; border: 1px solid var(--border); }
.swap-visual { background: var(--blue-soft); padding: 34px; display: flex; align-items: center; justify-content: center; }
.swap-visual img { max-height: 430px; object-fit: contain; }
.swap-checks { padding: 38px; background: #fff; }
.process { display: grid; grid-template-columns: repeat(6,1fr); gap: 14px; }
.process-step { position: relative; padding: 24px 18px; border-radius: 18px; background: #fff; border: 1px solid var(--border); }
.process-step::after { content: ""; position: absolute; top: 37px; right: -15px; width: 15px; height: 1px; background: var(--border); }
.process-step:last-child::after { display: none; }
.step-number { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; border-radius: 11px; background: var(--blue); color: #fff; font-weight: 850; margin-bottom: 14px; }
.process-step h3 { font-size: 16px; }
.process-step p { margin: 10px 0; font-size: 13px; color: var(--muted); }
.process-step a { color: var(--blue-deep); font-size: 13px; font-weight: 750; }
.timeline { display: grid; gap: 0; border-top: 1px solid var(--border); }
.timeline-item { display: grid; grid-template-columns: 120px 1fr auto; gap: 22px; align-items: center; padding: 22px 0; border-bottom: 1px solid var(--border); }
.timeline-label { color: var(--blue-deep); font-weight: 800; }
.timeline-item h3 { font-size: 18px; margin-bottom: 5px; }
.timeline-item p { color: var(--muted); }
.review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.review { padding: 26px; border-radius: 20px; border: 1px solid var(--border); background: #fff; }
.review:nth-child(even) { background: var(--blue-pale); transform: translateY(18px); }
.review strong { color: var(--text); display: block; margin-bottom: 10px; }
.review p { color: var(--body); }
.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--border); border-radius: 17px; background: #fff; overflow: hidden; }
.faq-item button { width: 100%; min-height: 66px; padding: 16px 20px; border: 0; background: #fff; color: var(--text); font-weight: 800; text-align: left; display: flex; justify-content: space-between; align-items: center; }
.faq-item button::after { content: "+"; font-size: 24px; color: var(--blue); }
.faq-item.is-open button::after { content: "−"; }
.faq-answer { padding: 0 20px 20px; color: var(--body); }
.download-cta { padding: 56px; border-radius: 28px; text-align: center; background: linear-gradient(145deg, #e9f3ff, #f8fbff); border: 1px solid var(--border); }
.download-cta p { max-width: 720px; margin: 16px auto 24px; }
.page-hero { padding: 88px 0 72px; background: radial-gradient(circle at 85% 15%, rgba(41,128,254,.14), transparent 30%), linear-gradient(180deg,#fff,#f5f9ff); }
.page-hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.page-hero h1 { font-size: clamp(40px,5vw,64px); }
.page-hero p { margin-top: 20px; max-width: 760px; font-size: 18px; }
.page-hero-aside { padding: 30px; border-radius: 24px; background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow-soft); }
.page-hero-aside strong { display: block; color: var(--text); font-size: 18px; margin-bottom: 12px; }
.page-hero-aside ul { margin: 0; padding-left: 20px; }
.content-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 30px; }
.prose-card, .side-card { padding: 36px; border-radius: 24px; border: 1px solid var(--border); background: #fff; }
.prose-card h2, .side-card h2 { margin-bottom: 18px; }
.prose-card p + p { margin-top: 16px; }
.side-card { background: var(--blue-pale); }
.info-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.info-card { padding: 28px; border: 1px solid var(--border); border-radius: 20px; background: #fff; }
.info-card h3 { font-size: 21px; margin-bottom: 11px; }
.info-card p { color: var(--muted); }
.steps-vertical { counter-reset: step; display: grid; gap: 16px; }
.step-row { position: relative; padding: 24px 24px 24px 72px; border: 1px solid var(--border); border-radius: 18px; background: #fff; }
.step-row::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 22px; width: 34px; height: 34px; border-radius: 11px; background: var(--blue); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 850; }
.compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 18px; overflow: hidden; border: 1px solid var(--border); }
.compare-table th, .compare-table td { padding: 16px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.compare-table th { background: var(--blue-soft); color: var(--text); }
.notice { padding: 24px; border-radius: 18px; border-left: 4px solid var(--blue); background: var(--blue-pale); }
.notice strong { display: block; color: var(--text); margin-bottom: 7px; }
.related { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.related a { padding: 9px 13px; border-radius: 999px; border: 1px solid var(--border); background: #fff; color: var(--blue-deep); font-weight: 750; font-size: 14px; }
.site-footer { background: var(--footer); color: #c9d7e8; }
.footer-inner { width: var(--container); margin: 0 auto; padding: 68px 0 44px; display: grid; grid-template-columns: 1.5fr repeat(3,1fr); gap: 38px; }
.footer-brand img { filter: brightness(0) invert(1); }
.footer-brand p { margin: 18px 0 20px; max-width: 420px; }
.footer-download { min-height: 44px; }
.footer-links { display: grid; align-content: start; gap: 9px; }
.footer-links strong { color: #fff; margin-bottom: 8px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { width: var(--container); margin: 0 auto; padding: 20px 0 28px; border-top: 1px solid rgba(255,255,255,.12); display: flex; justify-content: space-between; gap: 20px; font-size: 13px; }
@media (max-width: 1120px) {
  .header-inner { grid-template-columns: 170px minmax(0,1fr) auto; gap: 12px; }
  .desktop-nav { display: none; }
  .header-actions { justify-self: end; }
  .hero-grid, .page-hero-grid { gap: 28px; }
  .process { grid-template-columns: repeat(3,1fr); }
  .process-step::after { display: none; }
  .category-grid { grid-template-columns: repeat(2,1fr); }
  .category-card.featured, .category-card.wide { grid-column: span 1; }
}
@media (max-width: 860px) {
  :root { --container: min(100% - 28px, 720px); }
  .section { padding: 72px 0; }
  .hero { min-height: auto; padding: 70px 0 90px; }
  .hero-grid, .page-hero-grid, .split-feature, .split-feature.reverse, .security-wrap, .swap-grid, .content-grid, .media-card, .media-card.large-right { grid-template-columns: 1fr; }
  .hero-visual { min-height: 430px; }
  .capability-grid { grid-template-columns: repeat(2,1fr); }
  .capability:nth-child(3) { border-left: 0; border-top: 1px solid var(--border); }
  .capability:nth-child(4) { border-top: 1px solid var(--border); }
  .dual-grid { grid-template-columns: 1fr; }
  .topic-panel.offset { transform: none; }
  .review-grid, .info-grid { grid-template-columns: repeat(2,1fr); }
  .review:nth-child(even) { transform: none; }
  .footer-inner { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-links:last-child { grid-column: 2 / span 2; }
}
@media (max-width: 620px) {
  :root { --container: calc(100% - 24px); }
  body { font-size: 15px; }
  .header-inner { min-height: 68px; grid-template-columns: minmax(100px,1fr) auto; }
  .brand img { width: 138px; }
  .header-download { min-height: 44px; padding: 0 15px; font-size: 14px; }
  .more-btn { width: 44px; height: 44px; }
  .hero { padding-top: 54px; }
  h1 { font-size: clamp(38px, 12vw, 52px); }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .hero-actions > * { width: 100%; }
  .hero-visual { min-height: 390px; }
  .float-note { position: static; display: inline-flex; margin: 6px 4px; }
  .hero-visual { flex-wrap: wrap; align-content: center; }
  .hero-visual img { width: 100%; max-height: 350px; }
  .capability-bar { margin-top: -36px; }
  .capability-grid, .category-grid, .review-grid, .info-grid, .process, .security-alerts { grid-template-columns: 1fr; }
  .capability + .capability { border-left: 0; border-top: 1px solid var(--border); }
  .split-feature, .feature-panel, .prose-card, .side-card, .topic-panel, .swap-checks, .media-card-copy { padding: 24px; }
  .feature-image, .media-card-visual { min-height: 320px; }
  .timeline-item { grid-template-columns: 1fr; gap: 6px; }
  .timeline-item .text-link { justify-content: flex-start; }
  .download-cta { padding: 38px 22px; }
  .page-hero { padding: 58px 0; }
  .page-hero-aside { padding: 24px; }
  .compare-table { display: block; overflow-x: auto; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 30px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-links:last-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; }
}