:root {
    --brand: #2980FE;
    --brand-dark: #1767D6;
    --brand-soft: #EAF3FF;
    --blue-gray: #F5F8FD;
    --gray: #F7F9FC;
    --white: #FFFFFF;
    --ink: #172033;
    --text: #465266;
    --muted: #718096;
    --line: #DCE6F2;
    --footer: #10233F;
    --radius-sm: 16px;
    --radius-md: 22px;
    --radius-lg: 28px;
    --shadow: 0 18px 50px rgba(29, 73, 128, .10);
    --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", "Microsoft JhengHei", sans-serif;
    line-height: 1.72;
    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 { cursor: pointer; }
p { margin: 0 0 1em; color: var(--text); }
h1, h2, h3 { margin: 0; line-height: 1.2; letter-spacing: -.02em; }
h1 { font-size: clamp(2.35rem, 5vw, 4.8rem); }
h2 { font-size: clamp(1.85rem, 3.4vw, 3rem); }
h3 { font-size: 1.2rem; }
ul, ol { margin: 0; padding-left: 1.2rem; }

.skip-link {
    position: fixed; left: 16px; top: -80px; z-index: 2000;
    padding: 10px 16px; border-radius: 10px; color: #fff; background: var(--brand-dark);
}
.skip-link:focus { top: 12px; }

.site-header {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(255,255,255,.94);
    border-bottom: 1px solid rgba(220,230,242,.82);
    backdrop-filter: blur(18px);
}
.header-shell {
    width: var(--shell); min-height: 76px; margin: 0 auto;
    display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px;
}
.brand { display: inline-flex; align-items: center; min-width: 142px; }
.brand img { max-height: 44px; width: auto; object-fit: contain; }
.desktop-nav { display: flex; justify-content: center; align-items: stretch; gap: 4px; min-width: 0; }
.desktop-nav > a, .nav-group > a {
    min-height: 76px; padding: 0 11px; display: inline-flex; align-items: center;
    color: #33425a; font-size: .94rem; font-weight: 700; white-space: nowrap;
    border-bottom: 3px solid transparent;
}
.desktop-nav > a:hover, .nav-group > a:hover, .desktop-nav .is-active {
    color: var(--brand-dark); border-bottom-color: var(--brand);
}
.nav-group { position: relative; }
.mega-menu {
    position: absolute; top: calc(100% - 1px); left: 0; width: 720px;
    display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 8px;
    padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 0 0 22px 22px;
    box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(10px);
    transition: .18s ease; pointer-events: none;
}
.mega-menu-right { left: auto; right: 0; }
.nav-group:hover .mega-menu, .nav-group:focus-within .mega-menu {
    opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto;
}
.mega-intro { grid-row: span 2; padding: 16px; border-radius: 18px; background: linear-gradient(135deg, var(--brand-soft), #fff); }
.mega-intro strong { display: block; margin-bottom: 8px; color: var(--brand-dark); font-size: 1.05rem; }
.mega-intro span, .mega-menu a span { display: block; color: var(--muted); font-size: .84rem; line-height: 1.5; }
.mega-menu a { padding: 12px 14px; border-radius: 14px; }
.mega-menu a:hover, .mega-menu a:focus { background: var(--blue-gray); color: var(--brand-dark); }
.mega-menu a strong { display: block; margin-bottom: 3px; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.download-btn, .button-primary, .button-secondary, .text-link {
    display: inline-flex; align-items: center; justify-content: center; min-height: 46px;
    border-radius: 999px; font-weight: 800; transition: .2s ease;
}
.download-btn, .button-primary { padding: 11px 22px; color: #fff; background: var(--brand); box-shadow: 0 9px 22px rgba(41,128,254,.22); }
.download-btn:hover, .button-primary:hover { background: var(--brand-dark); transform: translateY(-1px); }
.button-secondary { padding: 10px 20px; color: var(--brand-dark); border: 1px solid #bcd5f7; background: #fff; }
.button-secondary:hover { border-color: var(--brand); background: var(--brand-soft); }
.text-link { min-height: 0; padding: 0; color: var(--brand-dark); }
.text-link::after { content: "→"; margin-left: 7px; }
.menu-toggle { width: 46px; height: 46px; padding: 0; display: none; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: #fff; }
.menu-toggle span { display: block; width: 19px; height: 2px; margin: 3px auto; background: var(--ink); border-radius: 2px; }

.menu-overlay { position: fixed; inset: 0; z-index: 1090; background: rgba(16,35,63,.45); opacity: 0; transition: opacity .2s ease; }
.menu-overlay.is-visible { opacity: 1; }
.mobile-menu {
    position: fixed; top: 0; right: 0; z-index: 1100; width: min(430px, 92vw); height: 100dvh;
    padding: 18px; background: #fff; transform: translateX(105%); transition: transform .24s ease;
    overflow-y: auto; box-shadow: -20px 0 50px rgba(16,35,63,.17);
}
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu-head { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.menu-close { width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 50%; background: #fff; font-size: 1.8rem; line-height: 1; }
.mobile-menu-body { padding: 16px 0 30px; }
.mobile-menu-body > a, .mobile-menu details > a, .mobile-menu summary { min-height: 48px; display: flex; align-items: center; padding: 10px 12px; border-radius: 12px; font-weight: 700; }
.mobile-menu details { border-bottom: 1px solid var(--line); }
.mobile-menu details > a { margin-left: 14px; color: var(--text); font-weight: 600; }
.mobile-menu summary { justify-content: space-between; cursor: pointer; list-style: none; }
.mobile-menu summary::-webkit-details-marker { display: none; }
.mobile-menu summary::after { content: "+"; font-size: 1.3rem; color: var(--brand); }
.mobile-menu details[open] summary::after { content: "−"; }
.mobile-menu-body a:hover, .mobile-menu summary:hover { background: var(--brand-soft); color: var(--brand-dark); }

main { display: block; }
.section { padding: 92px 0; }
.section-compact { padding: 66px 0; }
.section-soft { background: var(--blue-gray); }
.section-blue { background: linear-gradient(145deg, #eaf3ff, #f9fbff); }
.section-dark { color: #fff; background: linear-gradient(135deg, #10233f, #174a83); }
.section-dark p, .section-dark .eyebrow, .section-dark li { color: #d7e7fb; }
.shell { width: var(--shell); margin: 0 auto; }
.eyebrow { margin-bottom: 12px; color: var(--brand-dark); font-size: .82rem; font-weight: 900; letter-spacing: .13em; text-transform: uppercase; }
.section-heading { max-width: 780px; margin-bottom: 36px; }
.section-heading p { max-width: 720px; margin: 16px 0 0; font-size: 1.03rem; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.tag { padding: 7px 12px; border: 1px solid #cfe0f6; border-radius: 999px; background: rgba(255,255,255,.76); color: var(--brand-dark); font-size: .88rem; font-weight: 700; }

.hero { position: relative; overflow: hidden; padding: 82px 0 58px; background: radial-gradient(circle at 83% 18%, rgba(41,128,254,.18), transparent 32%), linear-gradient(180deg, #fff, #f7faff); }
.hero::before { content: ""; position: absolute; width: 430px; height: 430px; left: -210px; bottom: -280px; border: 60px solid rgba(41,128,254,.05); border-radius: 50%; }
.hero-grid { display: grid; grid-template-columns: 1.18fr .82fr; gap: 56px; align-items: center; }
.hero-copy p { max-width: 680px; margin-top: 22px; font-size: 1.08rem; }
.hero-copy h1 span { color: var(--brand); }
.hero-visual { position: relative; min-height: 530px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; inset: 7% 3%; border-radius: 48% 52% 40% 60%; background: linear-gradient(145deg, #cfe4ff, #f9fcff); transform: rotate(-6deg); }
.hero-visual img { position: relative; z-index: 2; max-height: 510px; object-fit: contain; filter: drop-shadow(0 25px 34px rgba(27,83,153,.18)); }
.float-note { position: absolute; z-index: 3; max-width: 190px; padding: 13px 15px; border: 1px solid rgba(255,255,255,.9); border-radius: 15px; background: rgba(255,255,255,.9); box-shadow: var(--shadow); font-size: .86rem; font-weight: 800; color: var(--ink); }
.float-note::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 7px; border-radius: 50%; background: var(--brand); }
.float-note.one { left: -5px; top: 13%; }
.float-note.two { right: -18px; top: 43%; }
.float-note.three { left: 12%; bottom: 6%; }

.capability-strip { width: var(--shell); margin: -4px auto 0; 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: 24px; border-right: 1px solid var(--line); }
.capability-item:last-child { border-right: 0; }
.capability-item strong { display: block; margin-bottom: 8px; font-size: 1.02rem; }
.capability-item p { margin: 0; font-size: .91rem; }

.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.category-card { min-height: 220px; padding: 25px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; box-shadow: 0 10px 32px rgba(29,73,128,.06); }
.category-card.featured { grid-column: span 2; min-height: 260px; background: linear-gradient(135deg, var(--brand), var(--brand-dark)); color: #fff; }
.category-card.featured p, .category-card.featured .text-link { color: #eaf3ff; }
.category-card.wide { grid-column: span 2; background: linear-gradient(135deg, #f4f8ff, #fff); }
.category-card .number { color: var(--brand); font-weight: 900; font-size: .82rem; letter-spacing: .12em; }
.category-card.featured .number { color: #fff; }
.category-card h3 { margin: 12px 0 10px; font-size: 1.35rem; }
.category-card p { font-size: .94rem; }

.feature-split { display: grid; grid-template-columns: .86fr 1.14fr; gap: 42px; align-items: center; padding: 36px; border-radius: var(--radius-lg); background: linear-gradient(140deg, #e5f1ff, #f8fbff); }
.feature-media { min-height: 480px; display: grid; place-items: center; border-radius: 24px; background: rgba(255,255,255,.84); overflow: hidden; }
.feature-media img { max-height: 430px; object-fit: contain; }
.feature-copy { padding: 18px 16px; }
.check-list { display: grid; gap: 11px; padding: 0; list-style: none; margin-top: 22px; }
.check-list li { position: relative; padding-left: 30px; color: var(--text); }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 1px; width: 21px; height: 21px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--brand); font-size: .75rem; font-weight: 900; }
.section-dark .check-list li::before { background: #73b0ff; color: #10233f; }

.offset-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 24px; align-items: start; }
.info-panel { padding: 34px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; }
.info-panel.offset { margin-top: 70px; background: linear-gradient(145deg, #f0f6ff, #fff); }
.info-panel h3 { margin-bottom: 14px; font-size: 1.55rem; }
.info-panel ul { display: grid; gap: 9px; margin: 18px 0 24px; color: var(--text); }

.theme-pair { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; }
.theme-card { min-height: 430px; padding: 38px; border-radius: var(--radius-lg); overflow: hidden; }
.theme-card.primary { color: #fff; background: linear-gradient(145deg, var(--brand), #1767d6); }
.theme-card.primary p, .theme-card.primary li, .theme-card.primary .text-link { color: #eff6ff; }
.theme-card.light { margin-top: 60px; border: 1px solid var(--line); background: #fff; }
.theme-card img { max-height: 200px; margin: 20px auto 0; object-fit: contain; }

.security-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 42px; align-items: center; }
.security-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.security-point { padding: 18px; border: 1px solid rgba(255,255,255,.18); border-radius: 16px; background: rgba(255,255,255,.08); }
.security-point strong { display: block; margin-bottom: 6px; }
.security-point span { color: #d7e7fb; font-size: .9rem; }

.image-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.image-copy.reverse .image-frame { order: 2; }
.image-frame { min-height: 410px; display: grid; place-items: center; border-radius: var(--radius-lg); background: linear-gradient(145deg, #eaf3ff, #fff); }
.image-frame img { max-height: 360px; object-fit: contain; }

.swap-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 30px; }
.swap-intro, .swap-checks { padding: 34px; border-radius: var(--radius-lg); }
.swap-intro { background: linear-gradient(145deg, #eaf3ff, #fff); }
.swap-intro img { max-height: 270px; margin: 22px auto 0; object-fit: contain; }
.swap-checks { border: 1px solid var(--line); background: #fff; }

.steps { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; }
.step { position: relative; padding: 26px 16px; border-top: 2px solid #bcd5f7; }
.step::before { content: ""; position: absolute; top: -7px; left: 16px; width: 12px; height: 12px; border: 3px solid #fff; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 2px var(--brand); }
.step-number { display: block; margin-bottom: 13px; color: var(--brand); font-weight: 900; }
.step h3 { margin-bottom: 9px; font-size: 1rem; }
.step p { font-size: .86rem; }
.step a { color: var(--brand-dark); font-size: .88rem; font-weight: 800; }

.dual-callout { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.callout { padding: 38px; border-radius: var(--radius-lg); border: 1px solid var(--line); background: #fff; }
.callout.accent { border-color: transparent; background: linear-gradient(145deg, #1e6fda, #2980fe); color: #fff; }
.callout.accent p, .callout.accent li, .callout.accent .text-link { color: #eff6ff; }

.timeline { border-left: 2px solid #c9ddf7; }
.timeline-item { position: relative; display: grid; grid-template-columns: 130px 1fr auto; gap: 20px; align-items: start; padding: 0 0 28px 30px; }
.timeline-item::before { content: ""; position: absolute; left: -7px; top: 8px; width: 12px; height: 12px; border-radius: 50%; background: var(--brand); }
.timeline-date { color: var(--brand-dark); font-weight: 900; }
.timeline-item h3 { margin-bottom: 6px; }
.timeline-item p { margin: 0; }

.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review { padding: 26px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.review::before { content: "“"; display: block; height: 33px; color: var(--brand); font-size: 2.8rem; line-height: 1; font-weight: 900; }
.review p { margin: 8px 0 14px; }
.review strong { color: var(--brand-dark); font-size: .9rem; }

.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--line); border-radius: 17px; background: #fff; overflow: hidden; }
.faq-question { width: 100%; min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 17px 20px; border: 0; color: var(--ink); background: #fff; text-align: left; font-weight: 800; }
.faq-question::after { content: "+"; flex: 0 0 auto; color: var(--brand); font-size: 1.35rem; }
.faq-question[aria-expanded="true"]::after { content: "−"; }
.faq-answer { padding: 0 20px 19px; }
.faq-answer p { margin: 0; }

.download-cta { position: relative; padding: 58px; text-align: center; border-radius: 30px; overflow: hidden; color: #fff; background: linear-gradient(135deg, #2980fe, #115dbd); }
.download-cta::before, .download-cta::after { content: ""; position: absolute; border: 40px solid rgba(255,255,255,.08); border-radius: 50%; }
.download-cta::before { width: 240px; height: 240px; left: -120px; top: -130px; }
.download-cta::after { width: 170px; height: 170px; right: -80px; bottom: -100px; }
.download-cta h2, .download-cta p, .download-cta .download-btn { position: relative; z-index: 1; }
.download-cta p { max-width: 650px; margin: 16px auto 24px; color: #eaf3ff; }
.download-cta .download-btn { background: #fff; color: var(--brand-dark); box-shadow: none; }

.page-hero { padding: 78px 0 68px; background: radial-gradient(circle at 82% 10%, rgba(41,128,254,.18), transparent 28%), linear-gradient(180deg, #fff, #f5f8fd); }
.page-hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.page-hero h1 { font-size: clamp(2.4rem, 4.8vw, 4.35rem); }
.page-hero p { max-width: 700px; margin-top: 20px; font-size: 1.06rem; }
.page-visual { min-height: 340px; display: grid; place-items: center; border: 1px solid #d4e5fa; border-radius: var(--radius-lg); background: linear-gradient(145deg, #eaf3ff, #fff); }
.page-visual img { max-height: 300px; object-fit: contain; }

.content-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.content-card { padding: 28px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.content-card h3 { margin-bottom: 11px; }
.content-card p { margin: 0; }
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: process; }
.process-card { position: relative; padding: 28px; border-radius: 20px; background: var(--blue-gray); }
.process-card::before { counter-increment: process; content: "0" counter(process); display: block; margin-bottom: 20px; color: var(--brand); font-size: .8rem; font-weight: 900; letter-spacing: .12em; }
.process-card h3 { margin-bottom: 10px; }
.notice { padding: 24px 26px; border-left: 4px solid var(--brand); border-radius: 0 18px 18px 0; background: var(--brand-soft); }
.notice strong { display: block; margin-bottom: 7px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
table { width: 100%; min-width: 680px; border-collapse: collapse; }
th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--brand-dark); background: var(--blue-gray); }
tr:last-child td { border-bottom: 0; }
.anchor-nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.anchor-nav a { padding: 8px 13px; border: 1px solid #cfe0f6; border-radius: 999px; color: var(--brand-dark); background: #fff; font-size: .9rem; font-weight: 700; }

.page-visual-abstract { position: relative; overflow: hidden; background: radial-gradient(circle at 50% 50%, #ffffff 0 14%, #dbeaff 15% 31%, #f5f9ff 32% 100%); }
.abstract-orbit { position: relative; width: 210px; height: 210px; border: 1px solid #b8d3f5; border-radius: 50%; }
.abstract-orbit::before, .abstract-orbit::after { content: ""; position: absolute; inset: 28px; border: 1px solid #cfe0f6; border-radius: 50%; }
.abstract-orbit::after { inset: 64px; background: linear-gradient(145deg, var(--brand), var(--brand-dark)); box-shadow: 0 18px 35px rgba(41,128,254,.25); }
.abstract-orbit span { position: absolute; width: 17px; height: 17px; border: 4px solid #fff; border-radius: 50%; background: var(--brand); box-shadow: 0 5px 14px rgba(41,128,254,.25); }
.abstract-orbit span:nth-child(1) { left: 20px; top: 55px; }
.abstract-orbit span:nth-child(2) { right: 14px; top: 94px; }
.abstract-orbit span:nth-child(3) { left: 88px; bottom: -8px; }
.faq-visual-mark { width: 150px; height: 150px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: linear-gradient(145deg, var(--brand), var(--brand-dark)); box-shadow: 0 24px 48px rgba(41,128,254,.25); font-size: 5rem; font-weight: 900; }

.site-footer { padding-top: 66px; color: #fff; background: var(--footer); }
.footer-shell { width: var(--shell); margin: 0 auto; display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 36px; }
.footer-brand p { max-width: 430px; margin: 18px 0 22px; color: #c9d8eb; }
.footer-brand img { filter: brightness(0) invert(1); }
.footer-column h2 { margin-bottom: 15px; font-size: 1rem; color: #fff; }
.footer-column a { display: block; padding: 5px 0; color: #c9d8eb; }
.footer-column a:hover { color: #fff; }
.footer-bottom { width: var(--shell); margin: 50px auto 0; padding: 20px 0 26px; display: flex; justify-content: space-between; gap: 24px; border-top: 1px solid rgba(255,255,255,.13); }
.footer-bottom p { margin: 0; color: #aebfd5; font-size: .88rem; }
.footer-bottom div { display: flex; gap: 18px; white-space: nowrap; }
.footer-bottom a { color: #d5e1ef; font-size: .88rem; }

@media (max-width: 1120px) {
    .desktop-nav { display: none; }
    .header-shell { grid-template-columns: 1fr auto; }
    .menu-toggle { display: block; }
    .hero-grid, .page-hero-grid { gap: 32px; }
    .steps { grid-template-columns: repeat(3, 1fr); gap: 24px 0; }
    .footer-shell { grid-template-columns: 1.5fr repeat(2, 1fr); }
    .footer-column:last-child { grid-column: 2 / 4; display: grid; grid-template-columns: repeat(4, 1fr); align-items: start; }
    .footer-column:last-child h2 { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
    :root { --shell: min(100% - 30px, 720px); }
    .section { padding: 72px 0; }
    .hero-grid, .page-hero-grid, .feature-split, .security-grid, .image-copy, .swap-layout { grid-template-columns: 1fr; }
    .hero { padding-top: 56px; }
    .hero-visual { min-height: 440px; }
    .hero-visual img { max-height: 420px; }
    .capability-strip { grid-template-columns: repeat(2, 1fr); }
    .capability-item:nth-child(2) { border-right: 0; }
    .capability-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .category-card.featured, .category-card.wide { grid-column: span 2; }
    .offset-grid, .theme-pair, .dual-callout { grid-template-columns: 1fr; }
    .info-panel.offset, .theme-card.light { margin-top: 0; }
    .image-copy.reverse .image-frame { order: initial; }
    .timeline-item { grid-template-columns: 110px 1fr; }
    .timeline-item .text-link { grid-column: 2; justify-self: start; }
    .review-grid, .content-grid { grid-template-columns: repeat(2, 1fr); }
    .process-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-shell { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-column:last-child { grid-column: auto; display: block; }
}

@media (max-width: 560px) {
    :root { --shell: min(100% - 24px, 520px); }
    h1 { font-size: 2.45rem; }
    .header-shell { min-height: 68px; gap: 8px; }
    .site-header .brand { min-width: 0; }
    .site-header .brand img { max-width: 122px; }
    .header-actions { gap: 7px; }
    .header-actions .download-btn { min-height: 42px; padding: 9px 15px; font-size: .9rem; }
    .menu-toggle { width: 42px; height: 42px; }
    .section, .section-compact { padding: 58px 0; }
    .hero { padding: 42px 0 38px; }
    .hero-copy p { font-size: 1rem; }
    .hero-visual { min-height: 380px; }
    .hero-visual img { max-height: 350px; }
    .float-note { max-width: 155px; padding: 10px 11px; font-size: .76rem; }
    .float-note.one { left: 0; top: 8%; }
    .float-note.two { right: 0; top: 47%; }
    .float-note.three { left: 5%; bottom: 3%; }
    .capability-strip { grid-template-columns: 1fr; }
    .capability-item { border-right: 0; border-bottom: 1px solid var(--line); }
    .capability-item:last-child { border-bottom: 0; }
    .category-grid, .review-grid, .content-grid, .process-grid, .security-points, .footer-shell { grid-template-columns: 1fr; }
    .category-card.featured, .category-card.wide { grid-column: span 1; }
    .feature-split { padding: 18px; }
    .feature-media { min-height: 350px; }
    .info-panel, .theme-card, .swap-intro, .swap-checks, .callout { padding: 25px; }
    .steps { grid-template-columns: 1fr; gap: 0; }
    .step { padding: 23px 14px 23px 30px; border-top: 0; border-left: 2px solid #bcd5f7; }
    .step::before { top: 30px; left: -7px; }
    .timeline-item { grid-template-columns: 1fr; gap: 6px; padding-left: 25px; }
    .timeline-item .text-link { grid-column: 1; }
    .download-cta { padding: 42px 22px; }
    .page-hero { padding: 48px 0; }
    .page-visual { min-height: 300px; }
    .footer-bottom { flex-direction: column; }
}