:root {
    color-scheme: light;
    --brand: #1769e0;
    --brand-strong: #0c4fb8;
    --green: #14845f;
    --coral: #d94d3f;
    --ink: #142033;
    --muted: #5b6676;
    --line: #dce2ea;
    --surface: #f5f7fa;
    --white: #ffffff;
    --max-width: 1120px;
    --reading-width: 820px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--white);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    letter-spacing: 0;
    text-rendering: optimizeLegibility;
}

a {
    color: var(--brand-strong);
    text-underline-offset: 3px;
}

a:hover {
    color: var(--coral);
}

a:focus-visible {
    outline: 3px solid rgba(23, 105, 224, 0.3);
    outline-offset: 3px;
}

.site-header {
    position: sticky;
    z-index: 10;
    top: 0;
    border-bottom: 1px solid rgba(220, 226, 234, 0.9);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
}

.header-inner,
.page-width {
    width: min(calc(100% - 40px), var(--max-width));
    margin: 0 auto;
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--ink);
    font-size: 18px;
    font-weight: 700;
    text-decoration: none;
}

.brand-link img {
    width: 34px;
    height: 34px;
    border-radius: 7px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 14px;
}

.site-nav a {
    color: var(--muted);
    font-weight: 600;
    text-decoration: none;
}

.site-nav a[aria-current="page"] {
    color: var(--brand-strong);
}

.hero {
    min-height: 620px;
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
    align-items: center;
    gap: clamp(48px, 9vw, 120px);
    padding: 72px 0 88px;
}

.hero-copy {
    max-width: 650px;
}

.hero h1 {
    margin: 0;
    font-size: clamp(52px, 7vw, 84px);
    line-height: 1.05;
    letter-spacing: 0;
}

.hero-lead {
    margin: 24px 0 0;
    max-width: 610px;
    font-size: clamp(22px, 3vw, 34px);
    line-height: 1.35;
    font-weight: 650;
}

.hero-detail {
    margin: 22px 0 0;
    max-width: 580px;
    color: var(--muted);
    font-size: 17px;
}

.release-note {
    margin-top: 32px;
    padding: 13px 0 13px 16px;
    border-left: 4px solid var(--green);
    color: #285949;
    font-size: 14px;
    font-weight: 650;
}

.hero-mark {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-mark img {
    width: min(100%, 310px);
    height: auto;
    border-radius: 8px;
    box-shadow: 0 28px 70px rgba(20, 32, 51, 0.18);
}

.band {
    border-top: 1px solid var(--line);
    background: var(--surface);
}

.section {
    padding: 84px 0;
}

.section h2,
.legal-hero h1 {
    margin: 0;
    font-size: clamp(32px, 4vw, 46px);
    line-height: 1.2;
    letter-spacing: 0;
}

.section-intro {
    max-width: 730px;
    margin: 16px 0 0;
    color: var(--muted);
    font-size: 17px;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin: 48px 0 0;
    border-top: 1px solid var(--line);
}

.feature-item {
    min-height: 210px;
    padding: 32px 28px 24px 0;
    border-bottom: 1px solid var(--line);
}

.feature-item + .feature-item {
    padding-left: 28px;
    border-left: 1px solid var(--line);
}

.feature-item h3 {
    margin: 0;
    font-size: 20px;
}

.feature-item p {
    margin: 12px 0 0;
    color: var(--muted);
}

.price-table,
.data-table {
    width: 100%;
    margin-top: 36px;
    border-collapse: collapse;
    text-align: left;
}

.price-table th,
.price-table td,
.data-table th,
.data-table td {
    padding: 16px 18px;
    border: 1px solid var(--line);
    vertical-align: top;
}

.price-table th,
.data-table th {
    background: var(--surface);
    font-size: 14px;
}

.price-table strong {
    color: var(--brand-strong);
    font-size: 20px;
}

.fine-print {
    margin-top: 16px;
    color: var(--muted);
    font-size: 13px;
}

.legal-hero {
    padding: 72px 0 48px;
    border-bottom: 1px solid var(--line);
}

.legal-meta {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.legal-layout {
    display: grid;
    grid-template-columns: 220px minmax(0, var(--reading-width));
    gap: 56px;
    justify-content: center;
    padding: 48px 0 92px;
}

.legal-nav {
    position: sticky;
    top: 94px;
    align-self: start;
    padding-left: 18px;
    border-left: 2px solid var(--line);
}

.legal-nav strong {
    display: block;
    margin-bottom: 10px;
    font-size: 14px;
}

.legal-nav a {
    display: block;
    padding: 5px 0;
    color: var(--muted);
    font-size: 13px;
    text-decoration: none;
}

.legal-content {
    min-width: 0;
}

.legal-content section {
    padding: 28px 0;
    border-bottom: 1px solid var(--line);
    scroll-margin-top: 90px;
}

.legal-content section:first-child {
    padding-top: 0;
}

.legal-content section:last-child {
    border-bottom: 0;
}

.legal-content h2 {
    margin: 0 0 14px;
    font-size: 24px;
    line-height: 1.35;
}

.legal-content h3 {
    margin: 24px 0 8px;
    font-size: 18px;
}

.legal-content p,
.legal-content ul,
.legal-content ol {
    margin-top: 10px;
    margin-bottom: 10px;
}

.legal-content li + li {
    margin-top: 6px;
}

.notice {
    margin: 22px 0;
    padding: 18px 20px;
    border: 1px solid #b8d9cb;
    border-left: 4px solid var(--green);
    border-radius: 6px;
    background: #f3faf7;
}

.warning {
    border-color: #f0c7c3;
    border-left-color: var(--coral);
    background: #fff7f6;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: var(--surface);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 32px;
    padding: 32px 0 38px;
    color: var(--muted);
    font-size: 13px;
}

.footer-links {
    display: flex;
    gap: 18px;
}

@media (max-width: 820px) {
    .header-inner,
    .page-width {
        width: min(calc(100% - 28px), var(--max-width));
    }

    .site-header {
        position: static;
    }

    .header-inner {
        min-height: 64px;
    }

    .site-nav {
        gap: 14px;
    }

    .hero {
        min-height: auto;
        grid-template-columns: 1fr;
        gap: 42px;
        padding: 56px 0 70px;
    }

    .hero h1 {
        font-size: 54px;
    }

    .hero-mark {
        justify-content: flex-start;
    }

    .hero-mark img {
        width: 180px;
    }

    .section {
        padding: 64px 0;
    }

    .feature-list {
        grid-template-columns: 1fr;
    }

    .feature-item,
    .feature-item + .feature-item {
        min-height: auto;
        padding: 24px 0;
        border-left: 0;
    }

    .legal-layout {
        display: block;
        padding: 32px 0 68px;
    }

    .legal-nav {
        position: static;
        margin-bottom: 34px;
    }

    .data-table {
        display: block;
        overflow-x: auto;
        white-space: normal;
    }
}

@media (max-width: 560px) {
    body {
        font-size: 15px;
    }

    .brand-link span {
        display: none;
    }

    .site-nav {
        font-size: 13px;
    }

    .hero h1 {
        font-size: 48px;
    }

    .hero-lead {
        font-size: 25px;
    }

    .price-table th,
    .price-table td,
    .data-table th,
    .data-table td {
        padding: 12px 10px;
    }

    .footer-inner {
        display: block;
    }

    .footer-links {
        margin-top: 12px;
        flex-wrap: wrap;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

@media print {
    .site-header,
    .legal-nav,
    .site-footer {
        display: none;
    }

    body {
        color: #000000;
        font-size: 11pt;
    }

    .legal-layout {
        display: block;
        padding: 0;
    }

    a {
        color: #000000;
        text-decoration: none;
    }
}