:root {
  --brand: #2980FE;
  --brand-deep: #1767D6;
  --brand-soft: #EAF3FF;
  --blue-gray: #F5F8FD;
  --soft: #F7F9FC;
  --white: #FFFFFF;
  --ink: #172033;
  --text: #465266;
  --muted: #718096;
  --line: #DCE6F2;
  --footer: #10233F;
  --shadow: 0 18px 55px rgba(35, 81, 140, .10);
  --shadow-soft: 0 10px 30px rgba(35, 81, 140, .08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 16px;
  --shell: min(1180px, calc(100% - 40px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", Arial, sans-serif; font-size: 16px; line-height: 1.75; overflow-x: hidden; }
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 3000; padding: 10px 14px; background: var(--ink); color: #fff; 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, .75); background: rgba(255,255,255,.94); backdrop-filter: blur(18px); }
.header-shell { width: var(--shell); min-height: 76px; margin: 0 auto; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 26px; }
.brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
.brand img { width: 148px; max-height: 42px; object-fit: contain; object-position: left center; }
.desktop-nav { min-width: 0; display: flex; align-items: center; justify-content: center; gap: 2px; white-space: nowrap; }
.nav-link { min-height: 44px; padding: 9px 11px; display: inline-flex; align-items: center; font-weight: 650; font-size: 14px; color: #334057; border-radius: 12px; transition: .2s ease; }
.nav-link:hover, .nav-link:focus-visible, .nav-link.is-active, .nav-group.is-active > .nav-link { color: var(--brand-deep); background: var(--brand-soft); outline: none; }
.nav-group { position: relative; display: flex; align-items: center; }
.mega-toggle { width: 24px; height: 44px; margin-left: -8px; padding: 0; border: 0; background: transparent; cursor: pointer; }
.mega-toggle span { display: block; width: 7px; height: 7px; margin: -3px 0 0 6px; border-right: 1.5px solid #64748b; border-bottom: 1.5px solid #64748b; transform: rotate(45deg); transition: .2s ease; }
.nav-group:hover .mega-menu, .nav-group:focus-within .mega-menu, .nav-group.menu-visible .mega-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); pointer-events: auto; }
.nav-group.menu-visible .mega-toggle span { transform: rotate(225deg); margin-top: 5px; }
.mega-menu { position: absolute; left: 50%; top: calc(100% + 8px); width: min(690px, 80vw); padding: 22px; display: grid; grid-template-columns: 210px 1fr; gap: 20px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow); opacity: 0; visibility: hidden; pointer-events: none; transform: translate(-50%, 10px); transition: .2s ease; }
.mega-menu::before { content: ""; position: absolute; left: 0; right: 0; top: -12px; height: 14px; }
.mega-intro { padding: 19px; border-radius: 17px; background: linear-gradient(145deg, var(--brand-soft), #f8fbff); }
.mega-intro strong { display: block; margin-bottom: 6px; font-size: 17px; }
.mega-intro p { margin: 0; color: var(--text); font-size: 13px; line-height: 1.65; }
.mega-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.mega-links a { min-height: 72px; padding: 11px 13px; border-radius: 14px; transition: .2s ease; }
.mega-links a:hover, .mega-links a:focus-visible { background: var(--blue-gray); outline: none; }
.mega-links strong, .mega-links span { display: block; }
.mega-links strong { color: var(--ink); font-size: 14px; }
.mega-links span { margin-top: 2px; color: var(--muted); font-size: 12px; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.button { min-height: 48px; padding: 11px 22px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 14px; font-weight: 750; line-height: 1.2; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: linear-gradient(135deg, var(--brand), var(--brand-deep)); box-shadow: 0 10px 24px rgba(41,128,254,.24); }
.button-secondary { color: var(--brand-deep); background: #fff; border-color: #bcd5fb; }
.button-ghost { color: var(--ink); background: var(--blue-gray); border-color: var(--line); }
.button-compact { min-height: 44px; padding: 10px 17px; white-space: nowrap; font-size: 14px; }
.menu-button { width: 44px; height: 44px; padding: 10px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--line); border-radius: 13px; background: #fff; cursor: pointer; }
.menu-button span { width: 20px; height: 2px; background: var(--ink); border-radius: 3px; }
.menu-overlay, .mobile-menu { display: none; }
main { min-height: 55vh; }
.section { padding: 96px 0; }
.section-sm { padding: 70px 0; }
.shell { width: var(--shell); margin: 0 auto; }
.eyebrow { margin: 0 0 14px; display: inline-flex; align-items: center; gap: 8px; color: var(--brand-deep); font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--brand); border-radius: 4px; }
h1, h2, h3 { margin-top: 0; line-height: 1.2; letter-spacing: -.025em; }
h1 { margin-bottom: 22px; font-size: clamp(42px, 6vw, 72px); }
h2 { margin-bottom: 18px; font-size: clamp(31px, 4vw, 48px); }
h3 { margin-bottom: 10px; font-size: 21px; }
p { color: var(--text); }
.lead { max-width: 780px; margin: 0; font-size: clamp(18px, 2.1vw, 22px); line-height: 1.72; color: #3e4c63; }
.section-head { max-width: 780px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head.center .eyebrow { justify-content: center; }
.section-head.center .eyebrow::before { display: none; }
.hero { position: relative; overflow: hidden; padding: 74px 0 78px; background: radial-gradient(circle at 82% 18%, rgba(41,128,254,.16), transparent 28%), linear-gradient(180deg, #fff 0%, var(--blue-gray) 100%); }
.hero::before { content: ""; position: absolute; width: 420px; height: 420px; left: -230px; bottom: -250px; border: 78px solid rgba(41,128,254,.05); border-radius: 50%; }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.12fr .88fr; align-items: center; gap: 52px; }
.hero-copy { z-index: 2; }
.hero-copy p { max-width: 680px; font-size: 18px; }
.hero-actions, .inline-actions { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 12px; }
.tag-row { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px; }
.tag { padding: 7px 12px; color: #355274; background: rgba(255,255,255,.76); border: 1px solid rgba(188,213,251,.8); border-radius: 999px; font-size: 13px; font-weight: 700; }
.hero-visual { position: relative; min-height: 510px; display: grid; place-items: center; }
.hero-product { width: min(390px, 80%); max-height: 500px; object-fit: contain; filter: drop-shadow(0 28px 45px rgba(28,76,138,.17)); }
.float-note { position: absolute; max-width: 180px; padding: 12px 15px; background: rgba(255,255,255,.92); border: 1px solid var(--line); border-radius: 15px; box-shadow: var(--shadow-soft); font-size: 13px; font-weight: 750; color: #2a3a51; }
.float-note::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 7px; background: var(--brand); border-radius: 50%; }
.float-note.one { top: 12%; left: -2%; }
.float-note.two { right: 0; top: 38%; }
.float-note.three { left: 2%; bottom: 13%; }
.capability-strip { position: relative; z-index: 3; width: var(--shell); margin: -30px auto 0; display: grid; grid-template-columns: repeat(4, 1fr); background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow-soft); }
.capability-item { padding: 23px 24px; border-right: 1px solid var(--line); }
.capability-item:last-child { border-right: 0; }
.capability-item strong { display: block; margin-bottom: 6px; font-size: 16px; }
.capability-item p { margin: 0; font-size: 13px; line-height: 1.65; }
.category-grid { display: grid; grid-template-columns: repeat(15, minmax(0, 1fr)); gap: 18px; }
.category-card { position: relative; min-height: 210px; padding: 26px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; box-shadow: 0 9px 28px rgba(42,82,132,.06); }
.category-card::after { content: ""; position: absolute; width: 100px; height: 100px; right: -42px; bottom: -42px; border: 20px solid rgba(41,128,254,.06); border-radius: 50%; }
.category-card.featured { grid-column: span 6; min-height: 240px; background: linear-gradient(140deg, #eaf3ff, #fff); }
.category-card:nth-child(2), .category-card:nth-child(3), .category-card:nth-child(4) { grid-column: span 3; }
.category-card:nth-child(5), .category-card:nth-child(6), .category-card:nth-child(7) { grid-column: span 5; }
.category-card:nth-child(8) { grid-column: span 4; }
.category-card:nth-child(9) { grid-column: span 5; }
.category-card:nth-child(10) { grid-column: span 6; }
.category-number { width: 38px; height: 38px; margin-bottom: 20px; display: grid; place-items: center; color: var(--brand-deep); background: var(--brand-soft); border-radius: 12px; font-size: 13px; font-weight: 850; }
.category-card p { margin: 0 0 18px; font-size: 14px; }
.text-link { position: relative; z-index: 2; color: var(--brand-deep); font-weight: 800; }
.text-link::after { content: " →"; }
.feature-panel { padding: 52px; border-radius: var(--radius-lg); background: linear-gradient(135deg, #eaf3ff, #f8fbff 65%); }
.feature-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 58px; align-items: center; }
.feature-grid.reverse { grid-template-columns: 1.1fr .9fr; }
.feature-grid.reverse .feature-media { order: 2; }
.feature-media { min-height: 390px; padding: 28px; display: grid; place-items: center; border-radius: 24px; background: rgba(255,255,255,.78); border: 1px solid rgba(220,230,242,.9); }
.feature-media img { max-height: 410px; object-fit: contain; }
.content-panel { padding: 34px; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow-soft); }
.check-list, .plain-list { margin: 22px 0 0; padding: 0; list-style: none; }
.check-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.check-list li { position: relative; padding: 12px 14px 12px 42px; color: #39475b; background: var(--soft); border-radius: 13px; font-size: 14px; }
.check-list li::before { content: "✓"; position: absolute; left: 14px; top: 11px; width: 20px; height: 20px; display: grid; place-items: center; color: #fff; background: var(--brand); border-radius: 50%; font-size: 11px; font-weight: 900; }
.split-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.split-panel { position: relative; padding: 38px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; }
.split-panel.offset { margin-top: 42px; background: var(--blue-gray); }
.split-panel p { margin-bottom: 0; }
.mini-points { margin: 22px 0 0; display: grid; gap: 10px; }
.mini-points span { padding: 12px 14px; background: rgba(255,255,255,.86); border: 1px solid var(--line); border-radius: 13px; color: #3d4d64; font-size: 14px; }
.dual-feature { display: grid; grid-template-columns: 1.18fr .82fr; gap: 22px; align-items: stretch; }
.dual-feature article { padding: 42px; border-radius: var(--radius-lg); overflow: hidden; }
.dual-feature article:first-child { background: linear-gradient(145deg, #eff6ff, #fff); border: 1px solid var(--line); }
.dual-feature article:last-child { color: #fff; background: linear-gradient(145deg, #1767d6, #2980fe); }
.dual-feature article:last-child p, .dual-feature article:last-child li { color: rgba(255,255,255,.84); }
.dual-feature .image-inline { max-height: 230px; margin: 24px auto 0; object-fit: contain; }
.security-band { position: relative; overflow: hidden; color: #fff; background: linear-gradient(135deg, #10233f, #1767d6); }
.security-band::after { content: ""; position: absolute; width: 520px; height: 520px; right: -170px; top: -220px; border: 70px solid rgba(255,255,255,.05); border-radius: 50%; }
.security-band h2, .security-band h3 { color: #fff; }
.security-band p { color: rgba(255,255,255,.78); }
.security-layout { position: relative; z-index: 1; display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: center; }
.security-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; }
.security-list div { padding: 16px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); border-radius: 15px; }
.security-list strong { display: block; margin-bottom: 4px; }
.security-list span { color: rgba(255,255,255,.7); font-size: 13px; }
.media-copy-grid { display: grid; grid-template-columns: .88fr 1.12fr; gap: 48px; align-items: center; }
.media-copy-grid .media-box { min-height: 410px; padding: 28px; display: grid; place-items: center; background: var(--blue-gray); border-radius: var(--radius-lg); }
.media-copy-grid .media-box img { max-height: 390px; object-fit: contain; }
.swap-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 34px; align-items: center; }
.swap-media { padding: 30px; background: linear-gradient(145deg, var(--brand-soft), #fff); border-radius: var(--radius-lg); border: 1px solid var(--line); }
.swap-media img { max-height: 330px; margin: 0 auto; object-fit: contain; }
.flow { counter-reset: flow; display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; }
.flow-step { position: relative; padding: 0 17px; }
.flow-step::before { counter-increment: flow; content: counter(flow, decimal-leading-zero); width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 17px; color: var(--brand-deep); background: var(--brand-soft); border-radius: 50%; font-size: 13px; font-weight: 850; }
.flow-step:not(:last-child)::after { content: ""; position: absolute; left: 58px; right: -8px; top: 21px; height: 1px; background: #c9daf0; }
.flow-step h3 { font-size: 16px; }
.flow-step p { font-size: 13px; line-height: 1.65; }
.flow-step a { color: var(--brand-deep); font-size: 13px; font-weight: 800; }
.ecosystem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.ecosystem-card { padding: 40px; border-radius: var(--radius-lg); }
.ecosystem-card:first-child { background: #fff; border: 1px solid var(--line); }
.ecosystem-card:last-child { background: var(--brand-soft); }
.timeline { position: relative; display: grid; gap: 0; }
.timeline::before { content: ""; position: absolute; left: 111px; top: 16px; bottom: 16px; width: 1px; background: var(--line); }
.timeline-item { display: grid; grid-template-columns: 88px 1fr; gap: 44px; padding: 20px 0; }
.timeline-date { color: var(--brand-deep); font-size: 13px; font-weight: 800; }
.timeline-copy { position: relative; padding: 0 0 20px; border-bottom: 1px solid var(--line); }
.timeline-copy::before { content: ""; position: absolute; left: -49px; top: 6px; width: 11px; height: 11px; background: #fff; border: 3px solid var(--brand); border-radius: 50%; }
.timeline-copy h3 { font-size: 18px; }
.timeline-copy p { margin: 0; font-size: 14px; }
.review-track { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; }
.review:nth-child(2), .review:nth-child(5) { transform: translateY(18px); background: var(--blue-gray); }
.review-mark { color: var(--brand); font-size: 42px; line-height: 1; }
.review p { font-size: 14px; }
.review span { color: var(--muted); font-size: 12px; font-weight: 750; }
.faq-list { max-width: 900px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { width: 100%; min-height: 68px; padding: 17px 50px 17px 0; position: relative; text-align: left; border: 0; background: transparent; font-weight: 800; cursor: pointer; }
.faq-question::after { content: "+"; position: absolute; right: 4px; top: 17px; width: 34px; height: 34px; display: grid; place-items: center; color: var(--brand-deep); background: var(--brand-soft); border-radius: 50%; font-size: 21px; }
.faq-question[aria-expanded="true"]::after { content: "−"; }
.faq-answer { padding: 0 54px 23px 0; }
.faq-answer p { margin: 0; }
.cta-band { padding: 58px; text-align: center; border-radius: var(--radius-lg); background: radial-gradient(circle at 20% 20%, rgba(255,255,255,.2), transparent 25%), linear-gradient(135deg, #2980fe, #1767d6); color: #fff; }
.cta-band h2 { color: #fff; }
.cta-band p { max-width: 720px; margin: 0 auto; color: rgba(255,255,255,.83); }
.cta-band .inline-actions { justify-content: center; }
.cta-band .button-secondary { border-color: #fff; }
.inner-hero { position: relative; overflow: hidden; padding: 82px 0; background: linear-gradient(180deg, #f8fbff, #edf5ff); }
.inner-hero::after { content: ""; position: absolute; width: 360px; height: 360px; right: -110px; top: -180px; border: 65px solid rgba(41,128,254,.07); border-radius: 50%; }
.inner-hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr .85fr; gap: 50px; align-items: center; }
.inner-hero h1 { font-size: clamp(40px, 5vw, 64px); }
.inner-hero-card { padding: 30px; background: rgba(255,255,255,.84); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-soft); }
.inner-hero-card strong { display: block; margin-bottom: 12px; font-size: 18px; }
.inner-hero-card ul { margin: 0; padding: 0; display: grid; gap: 10px; list-style: none; }
.inner-hero-card li { padding: 10px 12px; color: var(--text); background: var(--blue-gray); border-radius: 12px; font-size: 14px; }
.inner-visual-image { width: 100%; max-height: 250px; margin-top: 20px; padding: 12px; object-fit: contain; border-radius: 18px; background: var(--blue-gray); }
.content-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.info-card { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; }
.info-card:nth-child(2n) { background: var(--blue-gray); }
.info-card p { margin-bottom: 0; font-size: 14px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
.step-card { padding: 30px; border-radius: var(--radius-md); background: #fff; border: 1px solid var(--line); }
.step-card::before { counter-increment: step; content: counter(step); width: 40px; height: 40px; margin-bottom: 18px; display: grid; place-items: center; color: #fff; background: var(--brand); border-radius: 12px; font-weight: 850; }
.notice { padding: 25px 28px; border-left: 4px solid var(--brand); border-radius: 0 16px 16px 0; background: var(--brand-soft); }
.notice strong { display: block; margin-bottom: 6px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; }
.data-table { width: 100%; min-width: 720px; border-collapse: collapse; background: #fff; }
.data-table th, .data-table td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.data-table th { color: var(--ink); background: var(--blue-gray); font-size: 13px; }
.data-table td { color: var(--text); font-size: 14px; }
.data-table tr:last-child td { border-bottom: 0; }
.article-layout { display: grid; grid-template-columns: 250px minmax(0,1fr); gap: 54px; align-items: start; }
.side-nav { position: sticky; top: 100px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.side-nav strong { display: block; margin-bottom: 12px; }
.side-nav a { display: block; padding: 9px 10px; color: var(--text); border-radius: 10px; font-size: 14px; }
.side-nav a:hover { color: var(--brand-deep); background: var(--brand-soft); }
.prose-section { padding: 0 0 42px; scroll-margin-top: 110px; }
.prose-section h2 { font-size: 32px; }
.prose-section p { max-width: 800px; }
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.contact-card { padding: 34px; border: 1px solid var(--line); border-radius: var(--radius-md); }
.contact-card:nth-child(2) { background: var(--blue-gray); }
.site-footer { padding-top: 66px; color: #dce8f8; background: var(--footer); }
.footer-shell { width: var(--shell); margin: 0 auto; display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 46px; }
.brand-footer img { filter: brightness(0) invert(1); }
.footer-brand p { max-width: 430px; color: #9fb1c8; font-size: 14px; }
.footer-links strong { display: block; margin-bottom: 14px; color: #fff; }
.footer-links a { display: block; padding: 5px 0; color: #aebfd4; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { width: var(--shell); margin: 52px auto 0; padding: 22px 0; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(255,255,255,.1); color: #8fa3bc; font-size: 12px; }
.bg-soft { background: var(--soft); }
.bg-blue { background: var(--blue-gray); }
.no-top { padding-top: 0; }
.center { text-align: center; }
.muted { color: var(--muted); }

@media (max-width: 1100px) {
  :root { --shell: min(100% - 32px, 980px); }
  .desktop-nav { display: none; }
  .header-shell { grid-template-columns: 1fr auto; }
  .header-actions { justify-self: end; }
  .menu-button { display: grid; }
  .menu-overlay { position: fixed; inset: 0; z-index: 1090; display: block; background: rgba(16,35,63,.38); opacity: 0; visibility: hidden; pointer-events: none; transition: .22s ease; }
  .mobile-menu { position: fixed; top: 0; right: 0; bottom: 0; z-index: 1100; width: min(480px, 92vw); display: flex; flex-direction: column; background: #fff; box-shadow: -20px 0 50px rgba(16,35,63,.18); transform: translateX(105%); visibility: hidden; transition: .25s ease; }
  body.menu-open .menu-overlay { opacity: 1; visibility: visible; pointer-events: auto; }
  body.menu-open .mobile-menu { transform: translateX(0); visibility: visible; }
  .mobile-menu-head { min-height: 76px; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
  .menu-close { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 13px; background: #fff; font-size: 27px; cursor: pointer; }
  .mobile-menu-scroll { padding: 18px 20px 30px; overflow-y: auto; overscroll-behavior: contain; }
  .mobile-home, .mobile-menu summary { min-height: 50px; display: flex; align-items: center; font-weight: 800; cursor: pointer; }
  .mobile-menu details { border-bottom: 1px solid var(--line); }
  .mobile-menu summary { list-style: none; position: relative; padding-right: 35px; }
  .mobile-menu summary::-webkit-details-marker { display: none; }
  .mobile-menu summary::after { content: "+"; position: absolute; right: 8px; font-size: 20px; color: var(--brand-deep); }
  .mobile-menu details[open] summary::after { content: "−"; }
  .mobile-menu details div { padding: 0 0 12px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .mobile-menu details a { min-height: 44px; padding: 10px 12px; display: flex; align-items: center; color: var(--text); background: var(--blue-gray); border-radius: 11px; font-size: 14px; }
  .mobile-download { width: 100%; margin-top: 22px; }
  .hero-grid, .inner-hero-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .hero-visual { min-height: 440px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .category-card, .category-card.featured, .category-card.wide, .category-card:nth-child(n) { grid-column: span 1; }
  .flow { grid-template-columns: repeat(3, 1fr); row-gap: 35px; }
  .flow-step:nth-child(3)::after { display: none; }
  .footer-shell { grid-template-columns: 1.4fr repeat(2, 1fr); }
  .footer-links:last-child { grid-column: 2 / 4; display: grid; grid-template-columns: repeat(2, 1fr); }
  .footer-links:last-child strong { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  :root { --shell: calc(100% - 28px); }
  .site-header { backdrop-filter: blur(12px); }
  .header-shell { min-height: 68px; gap: 12px; }
  .brand img { width: 124px; }
  .button-compact { min-height: 42px; padding: 9px 13px; font-size: 13px; }
  .menu-button { width: 42px; height: 42px; }
  .section { padding: 72px 0; }
  .section-sm { padding: 54px 0; }
  h1 { font-size: clamp(38px, 12vw, 54px); }
  h2 { font-size: clamp(28px, 9vw, 38px); }
  .hero { padding: 54px 0 66px; }
  .hero-grid, .inner-hero-grid, .feature-grid, .feature-grid.reverse, .security-layout, .media-copy-grid, .swap-grid, .dual-feature, .ecosystem-grid, .article-layout { grid-template-columns: 1fr; }
  .hero-visual { min-height: 420px; margin-top: 12px; }
  .hero-product { max-height: 390px; }
  .float-note.one { left: 0; top: 7%; }
  .float-note.two { right: 0; top: 38%; }
  .float-note.three { left: 3%; bottom: 7%; }
  .capability-strip { margin-top: -22px; grid-template-columns: repeat(2, 1fr); }
  .capability-item { border-bottom: 1px solid var(--line); }
  .capability-item:nth-child(2) { border-right: 0; }
  .capability-item:nth-child(3), .capability-item:nth-child(4) { border-bottom: 0; }
  .category-grid, .content-grid-3, .steps, .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-panel { padding: 28px; }
  .feature-grid.reverse .feature-media { order: 0; }
  .feature-media { min-height: 310px; }
  .split-grid { grid-template-columns: 1fr; }
  .split-panel.offset { margin-top: 0; }
  .dual-feature article { padding: 30px; }
  .security-list { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .flow-step::after { display: none; }
  .review-track { grid-template-columns: repeat(2, 1fr); }
  .review:nth-child(2), .review:nth-child(5) { transform: none; }
  .side-nav { position: static; }
  .footer-shell { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-links:last-child { grid-column: auto; display: block; }
  .footer-links:last-child strong { display: block; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 560px) {
  .header-actions { gap: 7px; }
  .header-actions .button-compact { padding-left: 11px; padding-right: 11px; }
  .hero-actions, .inline-actions { align-items: stretch; }
  .hero-actions .button, .inline-actions .button { flex: 1 1 100%; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 390px; }
  .float-note { max-width: 155px; font-size: 12px; }
  .capability-strip { grid-template-columns: 1fr; }
  .capability-item { border-right: 0; border-bottom: 1px solid var(--line) !important; }
  .capability-item:last-child { border-bottom: 0 !important; }
  .category-grid, .content-grid-3, .steps, .contact-grid, .review-track { grid-template-columns: 1fr; }
  .feature-panel, .content-panel, .split-panel, .ecosystem-card, .cta-band { padding: 25px; }
  .check-list, .security-list { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .timeline::before { left: 7px; }
  .timeline-item { grid-template-columns: 1fr; gap: 7px; padding-left: 28px; }
  .timeline-copy::before { left: -26px; }
  .timeline-copy { padding-bottom: 18px; }
  .inner-hero { padding: 62px 0; }
  .inner-hero-grid { grid-template-columns: 1fr; }
  .footer-shell { grid-template-columns: 1fr; }
  .footer-brand, .footer-links:last-child { grid-column: auto; }
}