:root {
    color-scheme: light;
    --ink: #211f3f;
    --muted: #5e6078;
    --indigo: #4f46e5;
    --indigo-deep: #332bb9;
    --lavender: #eeeeff;
    --canvas: #f8f9ff;
    --line: #dedff0;
    --warm: #e8862f;
    --white: #ffffff;
    --max: 1160px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--canvas);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--indigo-deep); text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { color: var(--indigo); }
a:focus-visible { outline: 3px solid var(--warm); outline-offset: 4px; border-radius: 3px; }
img { max-width: 100%; display: block; }
.skip-link { position: absolute; left: 16px; top: -60px; z-index: 20; background: var(--white); padding: 8px 12px; }
.skip-link:focus { top: 12px; }
.container { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.site-header {
    position: relative;
    z-index: 10;
    border-bottom: 1px solid var(--line);
    background: rgba(248, 249, 255, .94);
}
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-size: 18px; font-weight: 750; letter-spacing: -.03em; white-space: nowrap; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.brand span small { display: block; color: var(--muted); font-size: 11px; font-weight: 600; line-height: 1; letter-spacing: .04em; }
.site-nav { display: flex; align-items: center; gap: clamp(14px, 2.4vw, 34px); font-size: 14px; font-weight: 650; }
.site-nav a { color: var(--ink); text-decoration: none; white-space: nowrap; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--indigo); }
.site-nav .language-link { border-left: 1px solid var(--line); padding-left: 20px; color: var(--muted); }
.hero { padding-block: clamp(74px, 9vw, 126px) 112px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(350px, .98fr); align-items: center; gap: clamp(44px, 6vw, 92px); }
.hero h1 { margin: 0 0 27px; max-width: 720px; font-size: clamp(44px, 5.65vw, 76px); line-height: 1.13; letter-spacing: -.075em; font-weight: 780; }
.hero h1 .break { display: block; }
.hero-copy { max-width: 560px; margin: 0 0 34px; color: #42445e; font-size: clamp(17px, 1.6vw, 20px); line-height: 1.8; }
.action-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 11px 21px; border-radius: 15px; font-weight: 700; text-decoration: none; transition: transform .18s ease, background .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--indigo); box-shadow: 0 12px 26px rgba(79, 70, 229, .18); }
.button-primary:hover { color: var(--white); background: var(--indigo-deep); }
.button-secondary { color: var(--ink); border: 1px solid #cdd0e9; background: var(--white); }
.button-secondary:hover { color: var(--indigo); }
.hero-note { margin-top: 24px; color: var(--muted); font-size: 13px; }
.ledger-wrap { position: relative; padding: 26px; }
.ledger-wrap::before { content: ""; position: absolute; inset: 7% 0 0 8%; border-radius: 40px; background: #e5e5ff; transform: rotate(5deg); }
.ledger-wrap::after { content: ""; position: absolute; width: 128px; height: 128px; right: -20px; top: -18px; border: 1px solid #d1d0ff; border-radius: 50%; }
.ledger { position: relative; z-index: 1; background: var(--white); border: 1px solid #d8d9ee; border-radius: 28px; box-shadow: 0 28px 70px rgba(31, 27, 89, .10); overflow: hidden; }
.ledger-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 27px 29px 23px; border-bottom: 1px solid var(--line); }
.ledger-head strong { display: block; font-size: 24px; line-height: 1.25; letter-spacing: -.05em; }
.ledger-head small { color: var(--muted); }
.ledger-day { border-radius: 11px; background: var(--lavender); color: var(--indigo-deep); padding: 6px 11px; font-size: 13px; font-weight: 700; white-space: nowrap; }
.ledger-main { padding: 22px 29px 29px; }
.ledger-label { margin: 0 0 12px; color: var(--muted); font-size: 12px; font-weight: 700; }
.ledger-item { display: grid; grid-template-columns: 18px 1fr auto; align-items: start; gap: 13px; padding: 14px 0; border-top: 1px solid #efeff7; }
.ledger-item:first-of-type { border-top: 0; }
.ledger-dot { width: 11px; height: 11px; margin-top: 7px; border-radius: 50%; background: var(--indigo); box-shadow: 0 0 0 4px var(--lavender); }
.ledger-dot.warm { background: var(--warm); box-shadow: 0 0 0 4px #fff3e7; }
.ledger-item strong { display: block; font-size: 15px; line-height: 1.5; }
.ledger-item small { display: block; color: var(--muted); font-size: 13px; }
.ledger-tag { align-self: center; border-radius: 99px; background: #f0f0ff; color: var(--indigo-deep); padding: 3px 9px; font-size: 11px; font-weight: 700; white-space: nowrap; }
.ledger-bottom { display: flex; justify-content: space-between; gap: 10px; padding-top: 19px; margin-top: 5px; border-top: 1px solid var(--line); font-size: 13px; }
.ledger-bottom span { color: var(--muted); }
.ledger-bottom strong { color: var(--indigo-deep); }
.illustration-label { position: relative; z-index: 1; padding-left: 27px; margin-top: 10px; color: var(--muted); font-size: 12px; }
.section { padding-block: 104px; }
.section-heading { max-width: 750px; margin-bottom: 43px; }
.section-heading h2 { margin: 0 0 14px; font-size: clamp(31px, 3.5vw, 46px); line-height: 1.24; letter-spacing: -.055em; }
.section-heading p { margin: 0; color: var(--muted); font-size: 18px; }
.workflow { background: var(--white); border-block: 1px solid var(--line); }
.workflow-steps { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; padding-top: 28px; }
.workflow-step { position: relative; padding: 31px 19px 0 0; border-top: 2px solid #cfcee9; }
.workflow-step::before { content: ""; position: absolute; top: -8px; left: 0; width: 14px; height: 14px; border-radius: 50%; background: var(--indigo); box-shadow: 0 0 0 5px var(--white); }
.workflow-step:last-child { border-color: transparent; }
.workflow-step strong { display: block; margin-bottom: 7px; font-size: 18px; }
.workflow-step p { margin: 0; max-width: 160px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.feature-list { border-top: 1px solid var(--line); }
.feature-row { display: grid; grid-template-columns: 160px 1fr minmax(250px, .85fr); gap: 30px; align-items: start; padding: 30px 0; border-bottom: 1px solid var(--line); }
.feature-row .feature-number { color: var(--indigo); font-size: 14px; font-weight: 700; }
.feature-row h3 { margin: 0; font-size: clamp(21px, 2.25vw, 28px); line-height: 1.3; letter-spacing: -.04em; }
.feature-row p { margin: 0; color: var(--muted); }
.privacy-panel { position: relative; overflow: hidden; border-radius: 36px; background: #302baa; color: var(--white); padding: clamp(38px, 5.5vw, 76px); }
.privacy-panel::after { content: ""; position: absolute; right: -80px; top: -130px; width: 390px; height: 390px; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; box-shadow: 0 0 0 75px rgba(255,255,255,.045), 0 0 0 150px rgba(255,255,255,.04); }
.privacy-panel > * { position: relative; z-index: 1; }
.privacy-panel h2 { max-width: 650px; margin: 0 0 17px; font-size: clamp(32px, 4vw, 53px); line-height: 1.23; letter-spacing: -.06em; }
.privacy-panel p { max-width: 620px; margin: 0 0 30px; color: #e5e4ff; font-size: 18px; }
.privacy-points { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 33px; }
.privacy-points span { border: 1px solid rgba(255,255,255,.37); border-radius: 99px; padding: 6px 13px; font-size: 13px; }
.privacy-panel a { color: var(--white); text-decoration-color: rgba(255,255,255,.65); font-weight: 700; }
.faq { border-top: 1px solid var(--line); }
.faq-item { padding: 22px 0; border-bottom: 1px solid var(--line); }
.faq-item h3 { margin: 0 0 7px; font-size: 18px; }
.faq-item p { max-width: 760px; margin: 0; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); background: var(--white); }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; padding-block: 37px; }
.footer-inner p { margin: 0; color: var(--muted); font-size: 13px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13px; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--indigo); }
.footer-inner p a { color: inherit; text-decoration: none; }
.footer-inner p a:hover { color: var(--indigo); }
.document-hero { padding-block: 78px 55px; border-bottom: 1px solid var(--line); }
.document-hero h1 { margin: 0 0 14px; font-size: clamp(38px, 5vw, 62px); line-height: 1.2; letter-spacing: -.06em; }
.document-hero p { max-width: 740px; margin: 0; color: var(--muted); font-size: 17px; }
.document-date { display: inline-flex; margin-top: 28px; padding: 7px 12px; border-radius: 9px; background: var(--lavender); color: var(--indigo-deep); font-size: 13px; font-weight: 700; }
.document-layout { display: grid; grid-template-columns: 220px minmax(0, 740px); gap: clamp(40px, 7vw, 100px); align-items: start; padding-block: 69px 110px; }
.document-toc { position: sticky; top: 28px; border-left: 2px solid var(--line); padding-left: 17px; }
.document-toc strong { display: block; margin-bottom: 15px; font-size: 14px; }
.document-toc a { display: block; margin: 10px 0; color: var(--muted); font-size: 13px; line-height: 1.45; text-decoration: none; }
.document-toc a:hover { color: var(--indigo); }
.document-content { min-width: 0; }
.document-content section { scroll-margin-top: 30px; padding-bottom: 31px; margin-bottom: 36px; border-bottom: 1px solid var(--line); }
.document-content section:last-child { border-bottom: 0; }
.document-content h2 { margin: 0 0 17px; font-size: clamp(24px, 2.5vw, 31px); line-height: 1.3; letter-spacing: -.04em; }
.document-content h3 { margin: 29px 0 9px; font-size: 18px; }
.document-content p, .document-content li { color: #42445e; font-size: 16px; line-height: 1.85; }
.document-content p { margin: 0 0 15px; }
.document-content ul { padding-left: 22px; }
.document-callout { margin-bottom: 48px; padding: 23px 26px; background: var(--lavender); border-left: 4px solid var(--indigo); border-radius: 0 16px 16px 0; }
.document-callout p { margin: 0; color: var(--ink); }
.support-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero { padding-bottom: 70px; }
    .ledger-wrap { max-width: 590px; margin-inline: auto; width: 100%; }
    .workflow-steps { grid-template-columns: repeat(3, 1fr); row-gap: 30px; }
    .feature-row { grid-template-columns: 75px 1fr; }
    .feature-row p { grid-column: 2; }
    .document-layout { grid-template-columns: 1fr; gap: 33px; }
    .document-toc { position: static; display: flex; flex-wrap: wrap; gap: 0 16px; border-left: 0; border-bottom: 1px solid var(--line); padding: 0 0 12px; }
    .document-toc strong { width: 100%; margin-bottom: 2px; }
}
@media (max-width: 640px) {
    .container { width: min(calc(100% - 36px), var(--max)); }
    .header-inner { min-height: 70px; flex-wrap: wrap; gap: 4px 12px; padding-block: 12px; }
    .brand { font-size: 16px; }
    .brand img { width: 34px; height: 34px; }
    .site-nav { gap: 15px; width: 100%; justify-content: space-between; font-size: 12px; }
    .site-nav .language-link { padding-left: 12px; }
    .hero { padding-block: 60px 72px; }
    .hero h1 { font-size: clamp(38px, 11vw, 54px); }
    .hero-copy { font-size: 16px; }
    .ledger-wrap { padding: 11px; }
    .ledger-head, .ledger-main { padding-inline: 20px; }
    .ledger-head strong { font-size: 21px; }
    .ledger-wrap::after { display: none; }
    .section { padding-block: 72px; }
    .workflow-steps { grid-template-columns: repeat(2, 1fr); row-gap: 30px; }
    .workflow-step { padding-right: 12px; }
    .workflow-step strong { font-size: 16px; }
    .feature-row { grid-template-columns: 50px 1fr; gap: 12px; padding-block: 25px; }
    .feature-row h3 { font-size: 22px; }
    .privacy-panel { border-radius: 24px; padding: 34px 27px; }
    .document-hero { padding-block: 52px 43px; }
    .document-layout { padding-block: 40px 70px; }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .button { transition: none; }
    .button:hover { transform: none; }
}