:root {
    color-scheme: light;
    --paper: #fbf7ef;
    --paper-deep: #f1e3d0;
    --card: rgba(255, 253, 248, 0.88);
    --ink: #1b1713;
    --ink-secondary: #64594d;
    --bronze: #9b683f;
    --bronze-deep: #765033;
    --sage: #7f946b;
    --line: rgba(115, 94, 74, 0.18);
    --shadow: 0 20px 60px rgba(70, 51, 32, 0.08);
    --radius-large: 28px;
    --radius-medium: 20px;
    --page-width: 1120px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-width: 320px;
    margin: 0;
    color: var(--ink);
    background-color: var(--paper);
    background-image: linear-gradient(rgba(251, 247, 239, 0.9), rgba(251, 247, 239, 0.95)), url("/assets/paper-texture.png");
    background-size: auto, 620px auto;
    font-family: "SF Pro Text", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    font-size: 17px;
    line-height: 1.72;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--bronze-deep);
    text-underline-offset: 0.2em;
}

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

a:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(155, 104, 63, 0.42);
    outline-offset: 4px;
    border-radius: 8px;
}

.skip-link {
    position: fixed;
    z-index: 100;
    top: 12px;
    left: 12px;
    padding: 10px 16px;
    border-radius: 10px;
    color: #fff;
    background: var(--bronze-deep);
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: sticky;
    z-index: 20;
    top: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(251, 247, 239, 0.9);
    backdrop-filter: blur(18px);
}

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

.header-inner {
    display: flex;
    min-height: 78px;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--ink);
    font-family: "Songti SC", "STSong", serif;
    font-size: 1.35rem;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
}

.brand img {
    width: 46px;
    height: 46px;
    object-fit: contain;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
}

.site-nav a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    padding: 8px 13px;
    border-radius: 999px;
    color: var(--ink-secondary);
    font-size: 0.94rem;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
    color: var(--bronze-deep);
    background: rgba(155, 104, 63, 0.1);
}

main {
    min-height: calc(100vh - 220px);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
    align-items: center;
    gap: 64px;
    padding-block: 96px 72px;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--bronze-deep);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.12em;
}

h1,
h2,
h3 {
    margin-top: 0;
    color: var(--ink);
    font-family: "Songti SC", "STSong", serif;
    line-height: 1.24;
}

h1 {
    max-width: 780px;
    margin-bottom: 22px;
    font-size: clamp(2.7rem, 7vw, 5.6rem);
    font-weight: 700;
    letter-spacing: -0.035em;
}

h2 {
    margin-bottom: 16px;
    font-size: clamp(1.75rem, 3vw, 2.5rem);
}

h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.hero-copy {
    max-width: 670px;
    margin: 0;
    color: var(--ink-secondary);
    font-size: clamp(1.06rem, 2vw, 1.22rem);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 30px;
}

.hero-actions.centered {
    justify-content: center;
}

.button-link {
    display: inline-flex;
    min-height: 50px;
    align-items: center;
    justify-content: center;
    padding: 11px 22px;
    border: 1px solid var(--bronze-deep);
    border-radius: 999px;
    color: #fff;
    background: var(--bronze-deep);
    font-weight: 700;
    text-decoration: none;
}

.button-link.secondary {
    color: var(--bronze-deep);
    background: rgba(255, 253, 248, 0.68);
}

.hero-mark {
    display: grid;
    min-height: 360px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 42% 58% 51% 49% / 45% 39% 61% 55%;
    background: radial-gradient(circle at 48% 42%, rgba(255, 255, 255, 0.95), rgba(241, 227, 208, 0.62));
    box-shadow: var(--shadow);
}

.hero-mark img {
    width: min(72%, 290px);
    height: auto;
    filter: drop-shadow(0 18px 28px rgba(76, 53, 30, 0.12));
}

.section {
    padding-block: 36px 76px;
}

.section-intro {
    max-width: 700px;
    margin: 0 0 32px;
    color: var(--ink-secondary);
}

.feature-grid,
.support-grid,
.footer-grid {
    display: grid;
    gap: 18px;
}

.feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius-medium);
    background: var(--card);
    box-shadow: 0 12px 32px rgba(70, 51, 32, 0.05);
}

.card p:last-child,
.card ul:last-child {
    margin-bottom: 0;
}

.card p,
.card li {
    color: var(--ink-secondary);
}

.card ul,
.document-section ul {
    padding-left: 1.25em;
}

.privacy-callout {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 38px;
    align-items: center;
    padding: 38px;
    border: 1px solid rgba(127, 148, 107, 0.28);
    border-radius: var(--radius-large);
    background: rgba(238, 242, 230, 0.72);
}

.privacy-callout p {
    margin-bottom: 0;
    color: var(--ink-secondary);
}

.page-heading {
    max-width: 780px;
    padding-block: 72px 36px;
}

.page-heading h1 {
    margin-bottom: 18px;
    font-size: clamp(2.4rem, 6vw, 4.4rem);
}

.page-heading p {
    margin: 0;
    color: var(--ink-secondary);
    font-size: 1.08rem;
}

.document {
    display: grid;
    gap: 18px;
    padding-bottom: 80px;
}

.document-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    padding: 18px 22px;
    border: 1px solid var(--line);
    border-radius: 16px;
    color: var(--ink-secondary);
    background: rgba(255, 253, 248, 0.68);
    font-size: 0.94rem;
}

.document-section {
    padding: 30px clamp(22px, 4vw, 42px);
    border: 1px solid var(--line);
    border-radius: var(--radius-medium);
    background: var(--card);
}

.document-section p,
.document-section li {
    color: var(--ink-secondary);
}

.steps {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: item;
}

.steps li {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding-block: 13px;
    border-bottom: 1px solid var(--line);
    counter-increment: item;
}

.steps li:last-child {
    border-bottom: 0;
}

.steps li::before {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border-radius: 50%;
    color: var(--bronze-deep);
    background: var(--paper-deep);
    content: counter(item);
    font-weight: 700;
}

.notice {
    padding: 20px 22px;
    border-left: 4px solid var(--sage);
    border-radius: 0 14px 14px 0;
    color: var(--ink-secondary);
    background: rgba(238, 242, 230, 0.78);
}

.link-panel {
    max-width: 720px;
    margin: 72px auto;
    text-align: center;
}

.link-panel .brand-link-mark {
    width: 112px;
    height: 112px;
    margin-bottom: 20px;
    object-fit: contain;
}

.link-panel p {
    color: var(--ink-secondary);
}

[hidden] {
    display: none !important;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: rgba(241, 227, 208, 0.34);
}

.footer-inner {
    padding-block: 36px;
}

.footer-grid {
    grid-template-columns: 1fr auto;
    align-items: start;
}

.footer-brand {
    margin: 0 0 6px;
    font-family: "Songti SC", "STSong", serif;
    font-size: 1.2rem;
    font-weight: 700;
}

.footer-note,
.copyright {
    margin: 0;
    color: var(--ink-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px 18px;
}

.footer-links a {
    min-height: 44px;
    align-content: center;
    font-size: 0.9rem;
}

.copyright {
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
}

@media (max-width: 860px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding-block: 14px;
    }

    .site-nav {
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 3px;
    }

    .hero,
    .privacy-callout {
        grid-template-columns: 1fr;
    }

    .hero {
        gap: 38px;
        padding-top: 64px;
    }

    .hero-mark {
        min-height: 300px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 600px) {
    .header-inner,
    .footer-inner,
    .page-shell {
        width: min(calc(100% - 28px), var(--page-width));
    }

    .brand img {
        width: 42px;
        height: 42px;
    }

    .site-nav a {
        padding-inline: 11px;
        font-size: 0.9rem;
    }

    .hero {
        padding-block: 50px 54px;
    }

    h1 {
        font-size: clamp(2.55rem, 16vw, 4.1rem);
    }

    .feature-grid,
    .support-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-links {
        justify-content: flex-start;
    }

    .card,
    .document-section,
    .privacy-callout {
        padding: 22px;
    }

    .page-heading {
        padding-top: 52px;
    }
}

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

@media print {
    .site-header,
    .site-footer,
    .skip-link {
        display: none;
    }

    body {
        background: #fff;
    }

    .page-shell {
        width: 100%;
    }

    .document-section {
        break-inside: avoid;
        box-shadow: none;
    }
}