:root {
    --ink: #222222;
    --muted: #5a6266;
    --sea: #4ecdc4;
    --sea-soft: #84ded2;
    --paper: #f0f7fa;
    --white: #ffffff;
    --line: rgba(34, 34, 34, 0.11);
    --danger: #b42318;
    --success: #176b5f;
    --max-width: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    overflow-x: hidden;
    color: var(--ink);
    background: var(--paper);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}
body::before {
    content: "";
    position: fixed;
    z-index: 30;
    inset: 0;
    pointer-events: none;
    opacity: .035;
    background-image: radial-gradient(circle at 20% 30%, var(--ink) 0 .65px, transparent .8px);
    background-size: 5px 5px;
    mix-blend-mode: multiply;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
button, a, label { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
    outline: 3px solid var(--sea);
    outline-offset: 4px;
}
.skip-link {
    position: fixed;
    z-index: 100;
    left: 16px;
    top: -80px;
    padding: 12px 16px;
    color: var(--white);
    border-radius: 12px;
    background: var(--ink);
}
.skip-link:focus { top: 16px; }

.info-header {
    width: min(calc(100% - 40px), var(--max-width));
    min-height: 76px;
    position: sticky;
    z-index: 20;
    top: 0;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--line);
    background: rgba(240, 247, 250, .88);
    backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 750; letter-spacing: -.03em; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 11px; background: var(--white); box-shadow: 0 5px 16px rgba(34,34,34,.08); }
.brand-mark img { width: 23px; height: 23px; }
.brand-name { display: grid; gap: 1px; line-height: 1; }
.brand-name small { color: var(--muted); font-size: 7px; font-weight: 750; letter-spacing: .17em; }
.info-nav { display: flex; align-items: center; gap: 27px; font-size: 13px; font-weight: 650; }
.info-nav a { min-height: 44px; position: relative; display: inline-flex; align-items: center; }
.info-nav a[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 2px; border-radius: 999px; background: var(--sea); }
.support-link { min-height: 40px !important; padding: 0 17px; color: var(--white); border-radius: 999px; background: var(--ink); }
.support-link[aria-current="page"]::after { display: none; }

main { overflow: hidden; }
.info-hero {
    width: min(calc(100% - 40px), var(--max-width));
    min-height: 490px;
    position: relative;
    margin: 0 auto;
    padding: 82px 0 90px;
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(300px, .55fr);
    align-items: end;
    gap: 80px;
    border-bottom: 1px solid var(--line);
}
.hero-copy { position: relative; z-index: 2; }
.eyebrow { margin: 0 0 25px; display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; font-weight: 750; letter-spacing: .1em; }
.eyebrow > span { width: 7px; height: 7px; flex: 0 0 auto; border-radius: 50%; background: var(--sea); box-shadow: 0 0 0 4px rgba(78,205,196,.14); }
.info-hero h1 { max-width: 850px; margin: 0; font-size: clamp(54px, 7vw, 91px); line-height: 1.02; letter-spacing: -.075em; }
.info-hero h1 em { position: relative; z-index: 0; font-style: normal; }
.info-hero h1 em::after { content: ""; position: absolute; z-index: -1; left: -3px; right: -7px; bottom: 5px; height: 17px; opacity: .78; border-radius: 55% 42% 50% 38%; background: var(--sea-soft); transform: rotate(-1.2deg); }
.hero-summary { max-width: 690px; margin: 30px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.hero-note, .support-route-card { position: relative; z-index: 2; padding: 26px; border: 1px solid var(--ink); border-radius: 23px; background: var(--white); box-shadow: 8px 9px 0 rgba(34,34,34,.09); transform: rotate(1.5deg); }
.hero-note > span, .support-route-card > span { color: var(--muted); font-size: 9px; font-weight: 800; letter-spacing: .13em; }
.hero-note strong, .support-route-card strong { margin-top: 13px; display: block; font-size: 20px; line-height: 1.35; letter-spacing: -.035em; }
.hero-note p, .support-route-card p { margin: 12px 0 0; color: var(--muted); font-size: 12px; line-height: 1.7; }
.hero-orbit { width: 410px; height: 410px; position: absolute; right: -190px; top: 16px; opacity: .28; border: 1px solid var(--sea); border-radius: 50%; }
.hero-orbit i { position: absolute; inset: 55px; border: 1px solid var(--sea); border-radius: 50%; }
.hero-orbit i:nth-child(2) { inset: 110px; }
.hero-orbit i:nth-child(3) { inset: 165px; background: rgba(132,222,210,.24); }

.document-shell {
    width: min(calc(100% - 40px), var(--max-width));
    margin: 0 auto;
    padding: 80px 0 120px;
    display: grid;
    grid-template-columns: 270px minmax(0, 1fr);
    gap: 76px;
    align-items: start;
}
.index-sticky { position: sticky; top: 112px; }
.index-sticky > p { margin: 0 0 18px; color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .16em; }
.document-index nav { max-height: calc(100svh - 260px); padding-right: 10px; display: grid; gap: 2px; overflow-y: auto; scrollbar-width: thin; }
.document-index nav a { min-height: 39px; padding: 8px 9px; display: grid; grid-template-columns: 28px 1fr; align-items: center; gap: 7px; color: var(--muted); border-radius: 10px; font-size: 11px; line-height: 1.45; transition: color .2s ease, background .2s ease; }
.document-index nav a:hover { color: var(--ink); background: rgba(255,255,255,.68); }
.document-index nav span { color: var(--sea); font-size: 8px; font-weight: 850; letter-spacing: .08em; }
.index-support { margin-top: 22px; padding: 16px; display: grid; gap: 5px; color: var(--muted); border-radius: 15px; background: rgba(255,255,255,.65); font-size: 11px; line-height: 1.5; }
.index-support strong { color: var(--ink); font-size: 12px; }

.legal-document { padding: 56px clamp(32px, 6vw, 78px) 65px; border: 1px solid rgba(34,34,34,.07); border-radius: 32px; background: var(--white); box-shadow: 0 22px 65px rgba(34,34,34,.055); }
.document-topline { margin-bottom: 42px; padding-bottom: 18px; display: flex; justify-content: space-between; color: var(--muted); border-bottom: 1px solid var(--line); font-size: 8px; font-weight: 800; letter-spacing: .16em; }
.legal-document > p { margin: 0 0 21px; color: #454d50; font-size: 15px; line-height: 2; text-align: justify; text-justify: inter-ideograph; }
.legal-document > p strong { color: var(--ink); font-weight: 760; }
.legal-document .document-metadata { margin-bottom: 7px; color: var(--muted); font-size: 12px; line-height: 1.5; text-align: left; }
.legal-document .document-operator { margin: 18px 0 42px; padding: 15px 18px; color: var(--ink); border-left: 4px solid var(--sea); background: var(--paper); font-weight: 700; text-align: left; }
.legal-document h2 { scroll-margin-top: 110px; margin: 64px 0 23px; padding-top: 7px; font-size: clamp(24px, 3vw, 34px); line-height: 1.3; letter-spacing: -.045em; }
.legal-document h2::before { content: ""; width: 26px; height: 5px; margin-bottom: 15px; display: block; border-radius: 999px; background: var(--sea-soft); }
.legal-document h2:first-of-type { margin-top: 42px; }
.document-end { margin-top: 65px; padding: 24px; display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 17px; border-radius: 20px; background: var(--paper); }
.document-end > span { width: 42px; height: 42px; display: grid; place-items: center; color: var(--white); border-radius: 50%; background: var(--ink); }
.document-end strong { font-size: 14px; }
.document-end p { margin: 5px 0 0; color: var(--muted); font-size: 11px; line-height: 1.55; }
.document-end > a { padding: 11px 15px; color: var(--white); border-radius: 12px; background: var(--ink); font-size: 11px; font-weight: 750; }
.policy-switcher { width: min(calc(100% - 40px), var(--max-width)); margin: 0 auto 130px; display: grid; grid-template-columns: repeat(3, 1fr); }
.policy-switcher a { min-height: 130px; padding: 25px; position: relative; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--line); background: rgba(255,255,255,.55); }
.policy-switcher a:first-child { border-radius: 22px 0 0 22px; }
.policy-switcher a:last-child { border-radius: 0 22px 22px 0; }
.policy-switcher a + a { border-left: 0; }
.policy-switcher a[aria-current="page"] { background: var(--ink); color: var(--white); }
.policy-switcher span { color: var(--muted); font-size: 8px; font-weight: 800; }
.policy-switcher a[aria-current="page"] span { color: rgba(255,255,255,.55); }
.policy-switcher strong { font-size: 18px; }
.policy-switcher i { position: absolute; right: 22px; top: 20px; color: var(--sea); font-style: normal; }

.support-overview { width: min(calc(100% - 40px), var(--max-width)); margin: 76px auto 0; display: grid; grid-template-columns: repeat(3, 1fr); }
.support-overview article { min-height: 235px; padding: 30px; border: 1px solid var(--line); background: rgba(255,255,255,.62); }
.support-overview article:first-child { border-radius: 24px 0 0 24px; }
.support-overview article:last-child { border-radius: 0 24px 24px 0; }
.support-overview article + article { border-left: 0; }
.support-overview span { color: var(--muted); font-size: 8px; font-weight: 800; letter-spacing: .14em; }
.support-overview h2 { margin: 67px 0 11px; font-size: 25px; letter-spacing: -.045em; }
.support-overview p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }

.support-workspace { width: min(calc(100% - 40px), var(--max-width)); margin: 120px auto; display: grid; grid-template-columns: .82fr 1.18fr; gap: 90px; align-items: start; }
.support-guide-intro { position: sticky; top: 115px; }
.support-guide-intro h2, .support-faq h2 { margin: 0; font-size: clamp(40px, 5vw, 62px); line-height: 1.08; letter-spacing: -.065em; }
.support-guide-intro > p:not(.eyebrow) { margin: 26px 0 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
.support-guide-intro dl { margin: 40px 0 0; border-top: 1px solid var(--line); }
.support-guide-intro dl div { padding: 18px 0; display: grid; grid-template-columns: 90px 1fr; gap: 20px; border-bottom: 1px solid var(--line); font-size: 12px; line-height: 1.6; }
.support-guide-intro dt { color: var(--muted); }
.support-guide-intro dd { margin: 0; font-weight: 650; }
.support-route-card a, .support-guide-intro dd a, .support-path-note a { text-decoration-color: rgba(49,158,151,.45); text-underline-offset: 3px; }
.support-route-card a:hover, .support-guide-intro dd a:hover, .support-path-note a:hover { color: var(--sea); }
.support-route-card a:focus-visible, .support-guide-intro dd a:focus-visible, .support-path-note a:focus-visible { border-radius: 3px; outline: 3px solid rgba(49,158,151,.24); outline-offset: 3px; }

.support-path { padding: clamp(28px, 5vw, 52px); border-radius: 32px; background: var(--white); box-shadow: 0 22px 65px rgba(34,34,34,.07); }
.support-path-heading { padding-bottom: 22px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.support-path-heading span { color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .12em; }
.support-path-heading strong { padding: 8px 11px; color: var(--white); border-radius: 999px; background: var(--ink); font-size: 9px; letter-spacing: .12em; }
.support-path ol { margin: 0; padding: 0; list-style: none; }
.support-path li { min-height: 126px; padding: 25px 0; display: grid; grid-template-columns: 48px 1fr; align-items: center; gap: 18px; border-bottom: 1px solid var(--line); }
.support-path li > span { width: 43px; height: 43px; display: grid; place-items: center; color: var(--ink); border: 1px solid var(--ink); border-radius: 50%; font-size: 10px; font-weight: 850; }
.support-path li strong { display: block; font-size: 18px; letter-spacing: -.025em; }
.support-path li p { margin: 7px 0 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
.support-path-note { margin-top: 27px; padding: 18px; display: grid; grid-template-columns: 38px 1fr; align-items: center; gap: 14px; border-radius: 17px; background: var(--paper); }
.support-path-note > span { width: 38px; height: 38px; display: grid; place-items: center; color: var(--white); border-radius: 50%; background: var(--sea); font-weight: 850; }
.support-path-note p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.65; }
.support-path-note strong { display: block; color: var(--ink); font-size: 13px; }

.support-faq { width: min(calc(100% - 40px), var(--max-width)); margin: 0 auto 140px; padding-top: 110px; display: grid; grid-template-columns: .7fr 1.3fr; gap: 90px; border-top: 1px solid var(--line); }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { min-height: 76px; position: relative; padding: 24px 54px 24px 4px; display: flex; align-items: center; cursor: pointer; list-style: none; font-size: 15px; font-weight: 700; line-height: 1.5; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary i, .faq-list summary i::after { width: 18px; height: 2px; position: absolute; right: 8px; background: var(--ink); transition: transform .2s ease; }
.faq-list summary i::after { content: ""; inset: 0; transform: rotate(90deg); }
.faq-list details[open] summary i::after { transform: rotate(0); }
.faq-list details p { margin: -5px 55px 27px 4px; color: var(--muted); font-size: 13px; line-height: 1.8; }

.info-footer { width: min(calc(100% - 40px), var(--max-width)); min-height: 190px; margin: 0 auto; padding: 40px 0; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.footer-identity { display: grid; gap: 13px; }
.footer-identity p, .footer-legal p { margin: 0; }
.footer-brand { color: var(--ink); }
.info-footer > nav { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 25px; }
.info-footer > nav a { min-height: 24px; display: flex; align-items: center; }
.info-footer > nav a:hover { color: var(--ink); }
.footer-legal { display: grid; justify-items: end; gap: 8px; text-align: right; }
.footer-legal a { padding-bottom: 3px; border-bottom: 1px solid rgba(34,34,34,.2); }

@media (max-width: 900px) {
    .info-nav { gap: 17px; }
    .info-hero { grid-template-columns: 1fr; gap: 48px; }
    .hero-note, .support-route-card { max-width: 360px; }
    .document-shell { grid-template-columns: 1fr; gap: 30px; }
    .document-index { display: none; }
    .support-workspace { grid-template-columns: 1fr; gap: 55px; }
    .support-guide-intro { position: static; }
    .support-faq { grid-template-columns: 1fr; gap: 55px; }
    .info-footer { grid-template-columns: 1fr 1fr; }
    .footer-legal { grid-column: 1 / -1; justify-items: start; text-align: left; }
}

@media (max-width: 650px) {
    .info-header { width: calc(100% - 28px); min-height: calc(68px + env(safe-area-inset-top)); padding-top: env(safe-area-inset-top); }
    .brand-name small { display: none; }
    .info-nav { gap: 12px; }
    .info-nav a:nth-child(2), .info-nav a:nth-child(3) { display: none; }
    .support-link { padding-inline: 13px; }
    .info-hero { width: calc(100% - 28px); min-height: 520px; padding: 65px 0 70px; }
    .info-hero h1 { font-size: clamp(49px, 14vw, 68px); }
    .hero-summary { font-size: 15px; }
    .hero-orbit { right: -280px; }
    .document-shell { width: calc(100% - 28px); padding: 48px 0 85px; }
    .legal-document { padding: 36px 22px 42px; border-radius: 24px; }
    .legal-document > p { font-size: 14px; line-height: 1.95; text-align: left; }
    .legal-document h2 { margin-top: 50px; font-size: 25px; }
    .document-end { grid-template-columns: 38px 1fr; }
    .document-end > span { width: 38px; height: 38px; }
    .document-end > a { grid-column: 1 / -1; text-align: center; }
    .policy-switcher { width: calc(100% - 28px); margin-bottom: 90px; grid-template-columns: 1fr; gap: 8px; }
    .policy-switcher a, .policy-switcher a:first-child, .policy-switcher a:last-child { min-height: 105px; border: 1px solid var(--line); border-radius: 19px; }
    .support-overview { width: calc(100% - 28px); margin-top: 45px; grid-template-columns: 1fr; gap: 8px; }
    .support-overview article, .support-overview article:first-child, .support-overview article:last-child { min-height: 190px; border: 1px solid var(--line); border-radius: 20px; }
    .support-overview h2 { margin-top: 45px; }
    .support-workspace { width: calc(100% - 28px); margin: 90px auto; }
    .support-guide-intro h2, .support-faq h2 { font-size: 42px; }
    .support-path { padding: 28px 20px; border-radius: 24px; }
    .support-guide-intro dl div { grid-template-columns: 78px 1fr; }
    .category-options span { padding-inline: 8px; }
    .support-faq { width: calc(100% - 28px); margin-bottom: 95px; padding-top: 80px; }
    .faq-list summary { min-height: 70px; padding-right: 42px; font-size: 14px; }
    .faq-list details p { margin-right: 35px; }
    .info-footer { width: calc(100% - 28px); grid-template-columns: 1fr; justify-items: start; gap: 30px; }
    .footer-legal { grid-column: auto; }
}

@media print {
    body { background: var(--white); }
    body::before, .info-header, .document-index, .policy-switcher, .document-end, .info-footer, .hero-orbit, .hero-note { display: none !important; }
    .info-hero { min-height: 0; padding: 30px 0; display: block; }
    .info-hero h1 { font-size: 40px; }
    .document-shell { width: 100%; padding: 0; display: block; }
    .legal-document { padding: 0; border: 0; box-shadow: none; }
    .legal-document h2 { break-after: avoid; }
    .legal-document p { orphans: 3; widows: 3; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition-duration: .01ms !important; }
}