:root {
  --blue: #2980FE;
  --blue-deep: #1767D6;
  --blue-soft: #EAF3FF;
  --blue-gray: #F5F8FD;
  --gray-soft: #F7F9FC;
  --white: #FFFFFF;
  --text: #172033;
  --body: #465266;
  --muted: #718096;
  --border: #DCE6F2;
  --footer: #10233F;
  --shadow: 0 18px 44px rgba(31, 83, 151, .09);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 16px;
}
* { 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", Arial, sans-serif; line-height: 1.75; }
body.menu-open { overflow: hidden; }
a { color: var(--blue-deep); text-decoration: none; }
a:hover { color: var(--blue); }
img { max-width: 100%; height: auto; display: block; }
button, a { -webkit-tap-highlight-color: transparent; }
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.96); border-bottom: 1px solid rgba(220,230,242,.9); backdrop-filter: blur(14px); }
.header-shell { max-width: 1240px; margin: 0 auto; min-height: 76px; padding: 0 24px; display: flex; align-items: center; gap: 24px; }
.brand img { width: 142px; max-height: 44px; object-fit: contain; }
.desktop-nav { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: center; white-space: nowrap; }
.nav-item { position: relative; }
.nav-link { display: inline-flex; align-items: center; min-height: 76px; padding: 0 10px; font-size: 14px; font-weight: 700; color: #344054; border-bottom: 2px solid transparent; }
.nav-link:hover, .nav-link.is-active { color: var(--blue); border-color: var(--blue); }
.mega-menu { position: absolute; left: 50%; top: calc(100% - 6px); transform: translate(-50%, 10px); width: min(700px, 82vw); display: grid; grid-template-columns: 220px 1fr; gap: 18px; padding: 20px; background: #fff; border: 1px solid var(--border); border-radius: 22px; box-shadow: var(--shadow); opacity: 0; visibility: hidden; pointer-events: none; transition: .2s ease; }
.has-mega:hover .mega-menu, .has-mega:focus-within .mega-menu { opacity: 1; visibility: visible; pointer-events: auto; transform: translate(-50%, 0); }
.mega-intro { padding: 18px; border-radius: 16px; background: linear-gradient(145deg, var(--blue-soft), #fff); }
.mega-intro strong { display: block; font-size: 18px; margin-bottom: 8px; }
.mega-intro span { color: var(--body); font-size: 13px; }
.mega-links { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mega-links a { padding: 11px 12px; border-radius: 14px; color: var(--text); }
.mega-links a:hover { background: var(--gray-soft); }
.mega-links strong { display: block; font-size: 14px; }
.mega-links span { color: var(--muted); font-size: 12px; }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; flex-shrink: 0; }
.download-btn, .primary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 20px; border-radius: 14px; background: linear-gradient(135deg, var(--blue), var(--blue-deep)); color: #fff !important; font-weight: 800; box-shadow: 0 12px 24px rgba(41,128,254,.18); border: 0; }
.secondary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 20px; border-radius: 14px; border: 1px solid var(--border); color: var(--text); background: #fff; font-weight: 800; }
.menu-toggle { width: 46px; height: 46px; border: 1px solid var(--border); border-radius: 14px; background: #fff; display: none; align-items: center; justify-content: center; flex-direction: column; gap: 5px; cursor: pointer; }
.menu-toggle span { width: 20px; height: 2px; background: var(--text); border-radius: 4px; }
.mobile-overlay, .mobile-menu { display: none; }

main { overflow: hidden; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.section { padding: 92px 0; }
.section-sm { padding: 64px 0; }
.section-soft { background: var(--gray-soft); }
.section-blue { background: linear-gradient(145deg, #F4F8FF, #EAF3FF); }
.section-dark { background: linear-gradient(135deg, #10233F, #164A85); color: #fff; }
.section-dark p, .section-dark li { color: #D9E7F7; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 7px 11px; border-radius: 999px; background: var(--blue-soft); color: var(--blue-deep); font-size: 12px; font-weight: 800; letter-spacing: .04em; }
.section-dark .eyebrow { background: rgba(255,255,255,.12); color: #DDEBFF; }
h1, h2, h3 { line-height: 1.22; margin-top: 0; letter-spacing: -.02em; }
h1 { font-size: clamp(38px, 5vw, 68px); margin-bottom: 22px; }
h2 { font-size: clamp(30px, 3.5vw, 46px); margin-bottom: 18px; }
h3 { font-size: 22px; margin-bottom: 12px; }
p { color: var(--body); margin: 0 0 18px; }
.lead { font-size: clamp(17px, 2vw, 21px); color: #344054; max-width: 760px; }
.section-dark .lead { color: #E6F0FC; }
.section-head { max-width: 760px; margin-bottom: 42px; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.text-link { display: inline-flex; align-items: center; gap: 5px; font-weight: 800; }
.text-link::after { content: '→'; }

.hero { padding: 72px 0 54px; background: radial-gradient(circle at 80% 10%, rgba(41,128,254,.12), transparent 32%), linear-gradient(180deg, #fff 0%, #F7FAFF 100%); }
.hero-grid { display: grid; grid-template-columns: 1.18fr .92fr; gap: 52px; align-items: center; }
.hero-copy p { max-width: 760px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.hero-tags span { padding: 8px 12px; border: 1px solid var(--border); border-radius: 999px; background: rgba(255,255,255,.86); color: #48617B; font-size: 13px; font-weight: 700; }
.hero-visual { position: relative; min-height: 520px; display: grid; place-items: center; }
.hero-visual::before { content: ''; position: absolute; width: 78%; aspect-ratio: 1; border-radius: 40%; background: linear-gradient(145deg, #EAF3FF, #F7FAFF); transform: rotate(-8deg); }
.hero-visual img { position: relative; max-height: 510px; object-fit: contain; z-index: 1; }
.float-note { position: absolute; z-index: 2; padding: 12px 14px; border-radius: 14px; background: rgba(255,255,255,.95); border: 1px solid var(--border); box-shadow: var(--shadow); font-size: 13px; font-weight: 800; color: #2F4762; }
.note-a { top: 13%; left: 0; }.note-b { right: 0; top: 44%; }.note-c { left: 5%; bottom: 12%; }
.capability-strip { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--border); border-radius: 22px; overflow: hidden; background: #fff; box-shadow: 0 12px 32px rgba(31,83,151,.06); }
.capability-item { padding: 26px; border-right: 1px solid var(--border); }
.capability-item:last-child { border-right: 0; }
.capability-item strong { display: block; margin-bottom: 8px; }
.capability-item p { font-size: 14px; margin: 0; }

.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.category-card { min-height: 220px; padding: 26px; border: 1px solid var(--border); border-radius: 22px; background: #fff; display: flex; flex-direction: column; justify-content: space-between; box-shadow: 0 12px 34px rgba(31,83,151,.05); }
.category-card.featured { grid-column: span 2; background: linear-gradient(145deg, var(--blue-soft), #fff); }
.category-card.wide { grid-column: span 2; min-height: 200px; }
.category-card:nth-child(5), .category-card:nth-child(6), .category-card:nth-child(7) { grid-column: span 1; }
.category-card h3 { font-size: 24px; }
.category-card p { font-size: 15px; }
.category-spacer { grid-column: span 1; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split.reverse .split-media { order: 2; }
.split-media { min-height: 430px; display: grid; place-items: center; padding: 32px; border-radius: var(--radius-lg); background: linear-gradient(145deg, #EAF3FF, #F7FAFF); }
.split-media img { max-height: 420px; object-fit: contain; }
.panel { padding: 32px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow); }
.check-list { list-style: none; padding: 0; margin: 22px 0 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: 0; width: 21px; height: 21px; display: grid; place-items: center; border-radius: 50%; background: var(--blue-soft); color: var(--blue-deep); font-size: 12px; font-weight: 900; }
.section-dark .check-list li::before { background: rgba(255,255,255,.13); color: #fff; }

.stagger-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.stagger-card { padding: 34px; border-radius: var(--radius-lg); border: 1px solid var(--border); background: #fff; }
.stagger-card:nth-child(2) { margin-top: 64px; background: linear-gradient(145deg, var(--blue-soft), #fff); }
.topic-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 24px; }
.topic-card { padding: 36px; border-radius: var(--radius-lg); border: 1px solid var(--border); background: #fff; min-height: 320px; }
.topic-card.accent { background: linear-gradient(145deg, #F0F6FF, #FFFFFF); }
.media-topic { display: grid; grid-template-columns: .9fr 1.1fr; gap: 30px; align-items: center; }
.media-topic img { max-height: 360px; margin: auto; object-fit: contain; }
.safety-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.safety-box { border: 1px solid rgba(255,255,255,.16); border-radius: 24px; padding: 28px; background: rgba(255,255,255,.06); }
.swap-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 36px; align-items: center; }
.swap-media { padding: 26px; border-radius: var(--radius-lg); background: #fff; border: 1px solid var(--border); }
.swap-media img { max-height: 330px; margin: auto; }

.steps { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.step { position: relative; padding: 24px 18px; border-top: 3px solid var(--blue); background: #fff; border-radius: 0 0 18px 18px; box-shadow: 0 12px 30px rgba(31,83,151,.06); }
.step-num { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--blue-soft); color: var(--blue-deep); font-weight: 900; margin-bottom: 14px; }
.step h3 { font-size: 17px; }
.step p { font-size: 13px; }
.eco-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.eco-card { padding: 34px; border-radius: var(--radius-lg); background: #fff; border: 1px solid var(--border); }
.eco-card:last-child { background: linear-gradient(145deg, #EDF5FF, #fff); }
.timeline { display: grid; gap: 0; border-left: 2px solid var(--border); margin-left: 8px; }
.timeline-item { position: relative; padding: 0 0 28px 28px; }
.timeline-item::before { content: ''; position: absolute; width: 12px; height: 12px; left: -7px; top: 6px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 6px var(--blue-soft); }
.timeline-item small { color: var(--blue-deep); font-weight: 800; }
.experience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.experience-card { padding: 24px; border-radius: 18px; background: var(--gray-soft); border: 1px solid var(--border); }
.experience-card p { margin: 0; font-size: 15px; }
.faq-list { border-top: 1px solid var(--border); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question { width: 100%; min-height: 64px; padding: 18px 4px; border: 0; background: transparent; display: flex; justify-content: space-between; align-items: center; gap: 20px; text-align: left; color: var(--text); font-size: 17px; font-weight: 800; cursor: pointer; }
.faq-answer { display: none; padding: 0 4px 22px; max-width: 920px; }
.faq-item.is-open .faq-answer { display: block; }
.faq-item.is-open .faq-question span { transform: rotate(45deg); }
.cta-band { padding: 46px; border-radius: 30px; background: linear-gradient(135deg, #EAF3FF, #F8FBFF); border: 1px solid var(--border); text-align: center; }
.cta-band p { max-width: 700px; margin-left: auto; margin-right: auto; }

.page-hero { padding: 78px 0 62px; background: radial-gradient(circle at 80% 10%, rgba(41,128,254,.12), transparent 34%), linear-gradient(180deg, #fff, #F7FAFF); }
.page-hero .hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.page-hero .hero-meta span { padding: 8px 11px; background: #fff; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); font-size: 13px; }
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.info-card { padding: 28px; border: 1px solid var(--border); border-radius: 22px; background: #fff; }
.info-card.soft { background: var(--gray-soft); }
.info-card.blue { background: var(--blue-soft); }
.info-card ul { margin: 0; padding-left: 20px; color: var(--body); }
.info-card li + li { margin-top: 8px; }
.three-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mini-card { padding: 24px; border-radius: 20px; border: 1px solid var(--border); background: #fff; }
.notice { padding: 24px 28px; border-left: 4px solid var(--blue); border-radius: 16px; background: var(--blue-soft); color: var(--body); }
.notice strong { color: var(--text); }
.simple-table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: 18px; background: #fff; border: 1px solid var(--border); }
.simple-table th, .simple-table td { padding: 16px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.simple-table th { background: var(--gray-soft); color: var(--text); }
.simple-table tr:last-child td { border-bottom: 0; }
.prose { max-width: 860px; }
.prose h2 { margin-top: 48px; font-size: 30px; }
.prose h3 { margin-top: 28px; }
.prose ul { color: var(--body); }

.site-footer { background: var(--footer); color: #fff; padding: 64px 24px 22px; }
.footer-shell { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 1.05fr 1.95fr; gap: 54px; }
.footer-brand img { width: 150px; max-height: 48px; object-fit: contain; filter: brightness(0) invert(1); margin-bottom: 20px; }
.footer-brand p { color: #B9C8DA; max-width: 430px; font-size: 14px; }
.footer-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.footer-links strong { display: block; margin-bottom: 14px; }
.footer-links a { display: block; color: #B9C8DA; font-size: 14px; padding: 4px 0; }
.footer-links a:hover { color: #fff; }
.footer-bottom { max-width: 1180px; margin: 44px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); display: flex; justify-content: space-between; gap: 20px; color: #91A5BE; font-size: 12px; }

@media (max-width: 1080px) {
  .desktop-nav { display: none; }
  .menu-toggle { display: flex; }
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .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; }
  .category-spacer { display: none; }
  .mobile-overlay { position: fixed; inset: 0; z-index: 1200; background: rgba(16,35,63,.28); opacity: 0; visibility: hidden; transition: .2s; display: block; }
  .mobile-overlay.is-open { opacity: 1; visibility: visible; }
  .mobile-menu { display: block; position: fixed; z-index: 1300; top: 0; right: 0; width: min(430px, 90vw); height: 100vh; padding: 20px; background: #fff; transform: translateX(100%); transition: .24s ease; overflow-y: auto; box-shadow: -20px 0 50px rgba(16,35,63,.16); }
  .mobile-menu.is-open { transform: translateX(0); }
  .mobile-menu-head { display: flex; align-items: center; justify-content: space-between; min-height: 58px; margin-bottom: 14px; }
  .mobile-brand img { width: 140px; max-height: 42px; object-fit: contain; }
  .menu-close { width: 46px; height: 46px; border: 1px solid var(--border); border-radius: 14px; background: #fff; font-size: 28px; cursor: pointer; }
  .mobile-home, .mobile-group-toggle, .mobile-group-panel a { min-height: 48px; display: flex; align-items: center; width: 100%; }
  .mobile-home { padding: 0 14px; border-bottom: 1px solid var(--border); color: var(--text); font-weight: 800; }
  .mobile-group { border-bottom: 1px solid var(--border); }
  .mobile-group-toggle { justify-content: space-between; padding: 0 14px; border: 0; background: transparent; color: var(--text); font-size: 15px; font-weight: 800; cursor: pointer; }
  .mobile-group-panel { display: none; padding: 0 14px 10px; }
  .mobile-group.is-open .mobile-group-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; }
  .mobile-group-panel a { color: var(--body); font-size: 14px; }
}
@media (max-width: 760px) {
  .header-shell { min-height: 68px; padding: 0 16px; gap: 10px; }
  .brand img { width: 122px; }
  .header-actions { gap: 7px; }
  .header-actions .download-btn { min-height: 44px; padding: 0 13px; font-size: 14px; border-radius: 12px; }
  .menu-toggle { width: 44px; height: 44px; border-radius: 12px; }
  .container { padding: 0 18px; }
  .section { padding: 68px 0; }
  .section-sm { padding: 48px 0; }
  .hero { padding: 54px 0 44px; }
  .hero-grid, .split, .stagger-grid, .topic-grid, .media-topic, .safety-grid, .swap-grid, .eco-grid, .content-grid, .three-grid, .footer-shell { grid-template-columns: 1fr; }
  .hero-visual { min-height: 400px; }
  .hero-visual img { max-height: 390px; }
  .float-note { position: static; display: inline-flex; margin: 8px 4px 0 0; }
  .hero-visual { display: block; text-align: center; }
  .hero-visual::before { left: 11%; top: 6%; }
  .capability-strip { grid-template-columns: 1fr; }
  .capability-item { border-right: 0; border-bottom: 1px solid var(--border); }
  .capability-item:last-child { border-bottom: 0; }
  .category-grid, .experience-grid { grid-template-columns: 1fr; }
  .category-card, .category-card.featured, .category-card.wide { grid-column: span 1; min-height: 190px; }
  .split.reverse .split-media { order: 0; }
  .split-media { min-height: 320px; padding: 20px; }
  .stagger-card:nth-child(2) { margin-top: 0; }
  .steps { grid-template-columns: 1fr; }
  .step { border-top: 0; border-left: 3px solid var(--blue); border-radius: 0 18px 18px 0; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; }
  .page-hero { padding: 58px 0 46px; }
  .cta-band { padding: 32px 20px; }
  .simple-table { font-size: 13px; }
  .simple-table th, .simple-table td { padding: 12px; }
}
@media (max-width: 420px) {
  .brand img { width: 108px; }
  .header-actions .download-btn { padding: 0 10px; }
  .footer-links { grid-template-columns: 1fr; }
}