:root {
  --blue: #2980FE;
  --blue-dark: #1767D6;
  --blue-soft: #EAF3FF;
  --mist: #F5F8FD;
  --light: #F7F9FC;
  --white: #FFFFFF;
  --ink: #172033;
  --text: #465266;
  --muted: #718096;
  --line: #DCE6F2;
  --footer: #10233F;
  --shadow: 0 18px 55px rgba(36, 74, 130, .10);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --shell: min(1180px, calc(100% - 40px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--white); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", sans-serif; line-height: 1.72; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 9999; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 10px; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid rgba(220,230,242,.8); background: rgba(255,255,255,.94); backdrop-filter: blur(18px); }
.nav-shell { width: var(--shell); min-height: 74px; margin: 0 auto; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px; }
.brand { display: inline-flex; align-items: center; min-width: 132px; }
.brand img { width: 132px; max-height: 42px; object-fit: contain; }
.desktop-nav { display: flex; justify-content: center; align-items: center; gap: 3px; white-space: nowrap; }
.nav-link { display: inline-flex; align-items: center; min-height: 44px; padding: 0 11px; color: var(--ink); font-weight: 700; font-size: 14px; border-radius: 12px; }
.nav-link:hover, .nav-link:focus-visible, .nav-link.is-active { color: var(--blue-dark); background: var(--blue-soft); }
.nav-group { position: relative; }
.mega-menu { position: absolute; left: 50%; top: calc(100% + 10px); width: 610px; transform: translate(-50%, 12px); padding: 18px; display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 10px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); opacity: 0; visibility: hidden; pointer-events: none; transition: .2s ease; }
.nav-group:hover .mega-menu, .nav-group:focus-within .mega-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); pointer-events: auto; }
.mega-menu::before { content: ""; position: absolute; left: 0; right: 0; top: -14px; height: 14px; }
.mega-menu a, .mega-intro { padding: 14px; border-radius: 14px; }
.mega-menu a:hover, .mega-menu a:focus-visible { background: var(--mist); color: var(--blue-dark); }
.mega-menu strong { display: block; color: var(--ink); font-size: 14px; }
.mega-menu span { display: block; margin-top: 3px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.mega-intro { grid-row: span 2; color: #fff; background: linear-gradient(145deg, var(--blue), var(--blue-dark)); }
.mega-intro strong { color: #fff; font-size: 17px; }
.mega-intro span { color: rgba(255,255,255,.82); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.download-btn, .primary-btn, .secondary-btn, .text-btn { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; border-radius: 14px; font-weight: 800; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.download-btn, .primary-btn { padding: 0 21px; color: #fff; background: linear-gradient(135deg, var(--blue), var(--blue-dark)); box-shadow: 0 10px 25px rgba(41,128,254,.24); }
.download-btn:hover, .primary-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(41,128,254,.30); }
.secondary-btn { padding: 0 20px; color: var(--blue-dark); border: 1px solid var(--line); background: #fff; }
.text-btn { padding: 0; min-height: auto; color: var(--blue-dark); justify-content: flex-start; }
.menu-toggle { width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 14px; background: #fff; display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.menu-toggle span { width: 20px; height: 2px; background: var(--ink); border-radius: 5px; }
.menu-backdrop { position: fixed; inset: 0; z-index: 1100; background: rgba(16,35,63,.48); opacity: 0; transition: opacity .22s ease; }
.menu-backdrop.is-visible { opacity: 1; }
.mobile-menu { position: fixed; top: 0; right: 0; z-index: 1200; width: min(92vw, 430px); height: 100dvh; padding: 20px; background: #fff; box-shadow: -22px 0 55px rgba(17,38,70,.18); overflow-y: auto; transform: translateX(105%); transition: transform .24s ease; }
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.menu-close { width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 14px; background: #fff; font-size: 28px; line-height: 1; }
.mobile-menu > a, .mobile-menu details a, .mobile-menu summary { display: flex; align-items: center; min-height: 48px; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--ink); font-weight: 700; }
.mobile-menu details a { padding-left: 26px; color: var(--text); font-weight: 600; }
.mobile-menu summary { cursor: pointer; list-style: none; justify-content: space-between; }
.mobile-menu summary::-webkit-details-marker { display: none; }
.mobile-menu summary::after { content: "+"; color: var(--blue); font-size: 20px; }
.mobile-menu details[open] summary::after { content: "−"; }
.mobile-download { margin-top: 18px; border-bottom: 0 !important; color: #fff !important; }
body.menu-open { overflow: hidden; }
main { min-height: 60vh; }
.shell { width: var(--shell); margin: 0 auto; }
.section { padding: 90px 0; }
.section-sm { padding: 62px 0; }
.section-soft { background: var(--mist); }
.section-blue { background: var(--blue-soft); }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 13px; color: var(--blue-dark); font-size: 13px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--blue); }
h1, h2, h3 { margin: 0; color: var(--ink); line-height: 1.18; }
h1 { font-size: clamp(38px, 5vw, 68px); letter-spacing: -.035em; }
h2 { font-size: clamp(29px, 3.4vw, 46px); letter-spacing: -.025em; }
h3 { font-size: 20px; }
p { margin: 0; }
.lead { margin-top: 20px; max-width: 760px; color: var(--text); font-size: clamp(17px, 1.7vw, 20px); }
.section-head { max-width: 780px; margin-bottom: 40px; }
.section-head p { margin-top: 15px; }
.hero { padding: 76px 0 50px; background: radial-gradient(circle at 88% 12%, rgba(41,128,254,.16), transparent 31%), linear-gradient(180deg, #fff 0%, var(--mist) 100%); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 54px; }
.hero-copy p { margin-top: 22px; max-width: 680px; font-size: 18px; }
.hero-actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; }
.hero-tags { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span { padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; color: var(--blue-dark); background: rgba(255,255,255,.8); font-size: 13px; font-weight: 800; }
.hero-visual { position: relative; min-height: 510px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; width: 380px; height: 380px; border-radius: 50%; background: linear-gradient(145deg, rgba(41,128,254,.16), rgba(255,255,255,.6)); border: 1px solid rgba(41,128,254,.18); }
.hero-visual img { position: relative; z-index: 1; max-height: 470px; object-fit: contain; filter: drop-shadow(0 28px 30px rgba(31,77,145,.16)); }
.float-note { position: absolute; z-index: 2; max-width: 170px; padding: 13px 15px; border: 1px solid rgba(220,230,242,.9); border-radius: 15px; background: rgba(255,255,255,.9); box-shadow: 0 15px 35px rgba(38,77,133,.12); color: var(--ink); font-size: 13px; font-weight: 800; }
.note-one { left: 0; top: 15%; }.note-two { right: 0; top: 45%; }.note-three { left: 9%; bottom: 10%; }
.capability-strip { margin-top: 30px; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow); overflow: hidden; }
.capability-item { padding: 25px; border-right: 1px solid var(--line); }
.capability-item:last-child { border-right: 0; }
.capability-item h3 { margin-bottom: 8px; }
.capability-item p { font-size: 14px; }
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.category-card { position: relative; min-height: 220px; padding: 27px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; overflow: hidden; transition: transform .2s ease, box-shadow .2s ease; }
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.category-card::after { content: ""; position: absolute; right: -28px; bottom: -38px; width: 110px; height: 110px; border-radius: 50%; background: var(--blue-soft); }
.category-card.featured { grid-column: span 2; background: linear-gradient(140deg, var(--blue), var(--blue-dark)); border-color: transparent; }
.category-card.featured h3, .category-card.featured p, .category-card.featured a { color: #fff; }
.category-card.wide { grid-column: span 2; min-height: 190px; }
.category-card p { margin: 13px 0 20px; font-size: 15px; }
.split-feature { display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: 55px; padding: 42px; border-radius: var(--radius-xl); background: var(--blue-soft); }
.image-panel { min-height: 420px; display: grid; place-items: center; border-radius: 24px; background: #fff; overflow: hidden; }
.image-panel img { max-height: 390px; object-fit: contain; }
.content-panel { padding: 8px; }
.content-panel p { margin-top: 17px; }
.check-list, .plain-list { margin: 24px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.check-list li, .plain-list li { position: relative; padding-left: 30px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 1px; width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--blue); font-size: 12px; font-weight: 900; }
.plain-list li::before { content: ""; position: absolute; left: 4px; top: .8em; width: 8px; height: 8px; border-radius: 50%; background: var(--blue); }
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.topic-panel { padding: 35px; border: 1px solid var(--line); border-radius: var(--radius-xl); background: #fff; }
.topic-panel.offset { margin-top: 45px; }
.topic-panel p { margin-top: 15px; }
.topic-panel .secondary-btn, .topic-panel .primary-btn { margin-top: 24px; }
.topic-panel.large { min-height: 420px; }
.topic-panel.compact { min-height: 330px; }
.dark-safety { color: rgba(255,255,255,.82); background: linear-gradient(135deg, var(--footer), #164d8b); border-radius: var(--radius-xl); padding: 50px; display: grid; grid-template-columns: .95fr 1.05fr; gap: 45px; }
.dark-safety h2, .dark-safety h3 { color: #fff; }
.dark-safety .eyebrow { color: #a9d1ff; }
.safety-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.safety-item { padding: 18px; border: 1px solid rgba(255,255,255,.14); border-radius: 16px; background: rgba(255,255,255,.06); }
.safety-item h3 { margin-bottom: 7px; font-size: 17px; }
.hardware-grid, .swap-grid, .inner-hero-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 55px; }
.hardware-grid img, .swap-grid img, .inner-hero-grid img { max-height: 430px; margin: 0 auto; object-fit: contain; }
.swap-checks { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.swap-checks div { padding: 15px; border-radius: 14px; background: var(--mist); border: 1px solid var(--line); color: var(--ink); font-weight: 700; }
.steps { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.step { position: relative; padding: 24px 18px; border-top: 3px solid var(--blue); border-radius: 0 0 18px 18px; background: #fff; box-shadow: 0 14px 38px rgba(42,81,137,.08); }
.step-number { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-bottom: 14px; border-radius: 50%; color: #fff; background: var(--blue); font-weight: 900; }
.step h3 { font-size: 17px; }
.step p { margin: 10px 0 14px; font-size: 13px; }
.timeline { display: grid; gap: 0; border-left: 2px solid var(--line); margin-left: 10px; }
.timeline article { position: relative; padding: 0 0 28px 32px; }
.timeline article::before { content: ""; position: absolute; left: -8px; top: 5px; width: 14px; height: 14px; border: 3px solid #fff; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 2px var(--line); }
.timeline time { color: var(--blue-dark); font-size: 13px; font-weight: 800; }
.timeline h3 { margin-top: 4px; }
.timeline p { margin-top: 8px; }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review { padding: 26px; border-radius: 20px; background: #fff; border: 1px solid var(--line); }
.review strong { color: var(--ink); }
.review p { margin-top: 10px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--line); border-radius: 17px; background: #fff; overflow: hidden; }
.faq-item button { width: 100%; min-height: 60px; padding: 16px 20px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border: 0; background: transparent; color: var(--ink); font-weight: 800; text-align: left; }
.faq-item button::after { content: "+"; color: var(--blue); font-size: 24px; }
.faq-item.is-open button::after { content: "−"; }
.faq-answer { display: none; padding: 0 20px 20px; }
.faq-item.is-open .faq-answer { display: block; }
.cta-box { padding: 55px; border-radius: var(--radius-xl); text-align: center; color: #fff; background: linear-gradient(135deg, var(--blue), var(--blue-dark)); box-shadow: 0 24px 60px rgba(41,128,254,.22); }
.cta-box h2 { color: #fff; }
.cta-box p { max-width: 720px; margin: 16px auto 25px; color: rgba(255,255,255,.85); }
.cta-box .download-btn { background: #fff; color: var(--blue-dark); box-shadow: none; }
.inner-hero { padding: 72px 0 60px; background: linear-gradient(180deg, var(--mist), #fff); }
.inner-hero-grid { grid-template-columns: 1.1fr .9fr; }
.inner-hero .hero-actions { margin-top: 25px; }
.inner-hero-visual { min-height: 360px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: var(--radius-xl); background: linear-gradient(145deg, #fff, var(--blue-soft)); }
.kpi-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 34px; }
.kpi { padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.kpi strong { display: block; color: var(--ink); font-size: 18px; }
.content-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 32px; align-items: start; }
.article-card, .side-card { padding: 34px; border: 1px solid var(--line); border-radius: 22px; background: #fff; }
.article-card + .article-card { margin-top: 20px; }
.article-card h2 { font-size: 31px; }
.article-card h3 { margin-top: 24px; }
.article-card p { margin-top: 14px; }
.article-card .check-list { margin-top: 18px; }
.side-card { position: sticky; top: 98px; background: var(--mist); }
.side-card h2 { font-size: 24px; }
.side-card p { margin-top: 12px; }
.side-card .download-btn, .side-card .secondary-btn { width: 100%; margin-top: 16px; }
.table-wrap { overflow-x: auto; margin-top: 20px; border: 1px solid var(--line); border-radius: 16px; }
table { width: 100%; min-width: 660px; border-collapse: collapse; background: #fff; }
th, td { padding: 15px 17px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--ink); background: var(--mist); }
.notice { margin-top: 22px; padding: 20px; border-left: 4px solid var(--blue); border-radius: 12px; background: var(--blue-soft); }
.link-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.link-card { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.link-card p { margin: 10px 0 16px; }
.site-footer { padding: 60px 0 24px; color: rgba(255,255,255,.72); background: var(--footer); }
.footer-grid { width: var(--shell); margin: 0 auto; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 40px; }
.footer-brand img { width: 140px; max-height: 46px; object-fit: contain; filter: brightness(0) invert(1); }
.footer-brand p { margin-top: 18px; max-width: 380px; }
.footer-grid h2 { margin-bottom: 14px; color: #fff; font-size: 16px; }
.footer-grid a { display: block; padding: 5px 0; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { width: var(--shell); margin: 40px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: 14px; }
.footer-bottom nav { display: flex; gap: 18px; }
@media (min-width: 1025px) { .menu-toggle { display: inline-flex; } }
@media (max-width: 1120px) {
  .desktop-nav { display: none; }
  .nav-shell { grid-template-columns: 1fr auto; }
  .hero-grid, .split-feature, .dark-safety, .hardware-grid, .swap-grid, .inner-hero-grid { gap: 34px; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .category-card.featured, .category-card.wide { grid-column: span 1; }
}
@media (max-width: 820px) {
  :root { --shell: min(100% - 28px, 720px); }
  .section { padding: 68px 0; }
  .hero { padding-top: 54px; }
  .hero-grid, .split-feature, .dark-safety, .hardware-grid, .swap-grid, .inner-hero-grid, .content-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 430px; }
  .capability-strip { grid-template-columns: 1fr 1fr; }
  .capability-item:nth-child(2) { border-right: 0; }
  .capability-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .dual-grid { grid-template-columns: 1fr; }
  .topic-panel.offset { margin-top: 0; }
  .review-grid, .link-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .side-card { position: static; }
}
@media (max-width: 560px) {
  :root { --shell: calc(100% - 24px); }
  .nav-shell { min-height: 66px; gap: 8px; }
  .brand { min-width: 108px; }.brand img { width: 108px; }
  .header-actions { gap: 7px; }.header-actions .download-btn { min-height: 42px; padding: 0 14px; font-size: 14px; }.menu-toggle { width: 42px; height: 42px; }
  h1 { font-size: 39px; }
  h2 { font-size: 30px; }
  .hero-copy p { font-size: 16px; }
  .hero-actions > * { width: 100%; }
  .hero-visual { min-height: 360px; }
  .hero-visual::before { width: 280px; height: 280px; }
  .hero-visual img { max-height: 335px; }
  .float-note { position: static; max-width: none; display: inline-flex; margin: 5px; }
  .hero-visual { display: flex; flex-wrap: wrap; align-content: center; justify-content: center; }
  .hero-visual img { width: 100%; }
  .capability-strip, .category-grid, .safety-grid, .review-grid, .link-grid, .kpi-row { grid-template-columns: 1fr; }
  .capability-item { border-right: 0; border-bottom: 1px solid var(--line); }.capability-item:last-child { border-bottom: 0; }
  .split-feature, .dark-safety, .cta-box { padding: 28px 20px; }
  .image-panel { min-height: 300px; }
  .swap-checks { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .step { border-top: 0; border-left: 3px solid var(--blue); border-radius: 0 18px 18px 0; }
  .footer-grid { grid-template-columns: 1fr; }.footer-bottom { align-items: flex-start; flex-direction: column; }.footer-bottom nav { flex-wrap: wrap; }
}