:root {
    color-scheme: light;
    --bg: #f6f8fb;
    --surface: #ffffff;
    --surface-soft: #eef4f8;
    --text: #17212b;
    --muted: #657485;
    --line: #dbe3ea;
    --brand: #0f8b8d;
    --brand-strong: #0a6f72;
    --accent: #ef7b45;
    --shadow: 0 18px 45px rgba(23, 33, 43, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.72;
}

a {
    color: var(--brand-strong);
    text-decoration: none;
}

a:hover {
    color: #084d50;
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

.site-shell {
    min-height: 100vh;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid rgba(219, 227, 234, 0.82);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
}

.topbar-inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 14px 24px 12px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    flex: 0 0 auto;
    font-weight: 800;
    letter-spacing: 0;
    padding-top: 4px;
}

.brand img {
    width: 30px;
    height: 30px;
}

.brand small {
    display: block;
    color: var(--muted);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.2;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px 8px;
    flex-wrap: wrap;
    min-width: 0;
}

.nav a {
    border-radius: 999px;
    color: #304151;
    font-size: 13px;
    line-height: 1;
    padding: 8px 10px;
    white-space: nowrap;
}

.nav a:hover,
.nav a.is-active {
    background: var(--surface-soft);
    color: var(--brand-strong);
    text-decoration: none;
}

.language-switch {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-left: 8px;
    border: 1px solid rgba(15, 139, 141, 0.28);
    border-radius: 999px;
    background: #e7f5f6;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.68);
    padding: 4px;
}

.nav .language-switch a {
    min-width: 42px;
    border: 1px solid rgba(15, 139, 141, 0.2);
    background: #ffffff;
    color: #0a6f72;
    font-weight: 800;
    padding: 8px 12px;
    text-align: center;
}

.nav .language-switch a:hover {
    border-color: rgba(15, 139, 141, 0.5);
    background: #f6fcfc;
    color: #075d60;
}

.nav .language-switch a.is-active {
    border-color: var(--brand);
    background: var(--brand);
    box-shadow: 0 8px 18px rgba(15, 139, 141, 0.22);
    color: #ffffff;
}

.hero {
    border-bottom: 1px solid var(--line);
    background:
        linear-gradient(120deg, rgba(15, 139, 141, 0.12), rgba(239, 123, 69, 0.10)),
        #ffffff;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.16fr) minmax(300px, 0.84fr);
    gap: 32px;
    align-items: center;
    max-width: 1280px;
    min-height: 320px;
    margin: 0 auto;
    padding: 44px 24px;
}

.hero-copy {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 232px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--brand-strong);
    font-size: 14px;
    font-weight: 750;
}

.hero h1 {
    margin: 0;
    max-width: 780px;
    color: #101820;
    font-size: 46px;
    line-height: 1.12;
    letter-spacing: 0;
}

.hero p {
    max-width: 720px;
    margin: 18px 0 0;
    color: #455565;
    font-size: 18px;
    min-height: 62px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: auto;
    padding-top: 26px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 10px 16px;
    font-weight: 750;
    line-height: 1.2;
}

.button.primary {
    background: var(--brand);
    color: #ffffff;
}

.button.primary:hover {
    background: var(--brand-strong);
    color: #ffffff;
    text-decoration: none;
}

.button.secondary {
    border-color: var(--line);
    background: #ffffff;
    color: var(--text);
}

.button.secondary:hover {
    border-color: #bac8d4;
    color: var(--brand-strong);
    text-decoration: none;
}

.hero-panel {
    border: 1px solid rgba(15, 139, 141, 0.16);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.86);
    box-shadow: var(--shadow);
    min-height: 208px;
    padding: 22px;
}

.hero-panel h2 {
    margin: 0 0 12px;
    font-size: 20px;
    line-height: 1.3;
}

.hero-panel dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px 14px;
    margin: 0;
}

.hero-panel dt {
    color: var(--muted);
    font-weight: 650;
}

.hero-panel dd {
    margin: 0;
    font-weight: 700;
}

.layout {
    max-width: 1280px;
    margin: 0 auto;
    padding: 34px 24px 54px;
}

.content {
    min-width: 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 14px 38px rgba(23, 33, 43, 0.06);
    padding: 34px;
}

.content h1 {
    margin: 0 0 18px;
    color: #101820;
    font-size: 34px;
    line-height: 1.2;
    letter-spacing: 0;
}

.content h2 {
    margin: 34px 0 14px;
    color: #17212b;
    font-size: 24px;
    line-height: 1.28;
    letter-spacing: 0;
}

.content h3 {
    margin: 24px 0 10px;
    color: #22313f;
    font-size: 19px;
    line-height: 1.35;
    letter-spacing: 0;
}

.content p {
    margin: 0 0 14px;
}

.content ul,
.content ol {
    padding-left: 22px;
}

.content li {
    margin: 6px 0;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin: 18px 0 26px;
}

.download-card {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: 14px;
    justify-content: space-between;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f9fcfd;
    padding: 18px;
}

.download-card h3 {
    margin: 0 0 4px;
    font-size: 20px;
}

.download-meta {
    min-height: 46px;
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.45;
}

.download-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border-radius: 8px;
    background: var(--brand);
    color: #ffffff;
    font-weight: 800;
    line-height: 1.25;
    padding: 10px 12px;
    text-align: center;
}

.download-primary:hover {
    background: var(--brand-strong);
    color: #ffffff;
    text-decoration: none;
}

.download-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.download-links a {
    border: 1px solid rgba(15, 139, 141, 0.22);
    border-radius: 999px;
    background: #ffffff;
    color: var(--brand-strong);
    font-size: 13px;
    font-weight: 750;
    line-height: 1;
    padding: 8px 10px;
}

.download-links a:hover {
    border-color: rgba(15, 139, 141, 0.48);
    background: #eef8f8;
    text-decoration: none;
}

.content img {
    display: block;
    margin: 18px 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 10px 28px rgba(23, 33, 43, 0.08);
}

.admonition {
    margin: 22px 0;
    border: 1px solid var(--line);
    border-left: 4px solid var(--brand);
    border-radius: 8px;
    background: #f7fbfb;
    padding: 16px 18px;
}

.admonition.warning {
    border-left-color: var(--accent);
    background: #fff8f3;
}

.admonition-title {
    margin: 0 0 8px;
    color: var(--text);
    font-weight: 800;
}

pre {
    overflow: auto;
    border: 1px solid #d8e0e7;
    border-radius: 8px;
    background: #101820;
    color: #e9f1f7;
    padding: 16px;
}

code {
    border-radius: 6px;
    background: #edf3f7;
    color: #1f394d;
    font-family: "Cascadia Code", Consolas, Monaco, monospace;
    font-size: 0.94em;
    padding: 2px 5px;
}

pre code {
    display: block;
    background: transparent;
    color: inherit;
    padding: 0;
    white-space: pre;
}

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

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 22px 24px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 920px) {
    .topbar-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .nav {
        justify-content: flex-start;
    }

    .hero-inner,
    .layout {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 36px;
    }

    .download-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    body {
        font-size: 15px;
    }

    .topbar-inner,
    .hero-inner,
    .layout,
    .footer-inner {
        padding-left: 16px;
        padding-right: 16px;
    }

    .hero-inner {
        padding-top: 36px;
    }

    .hero h1 {
        font-size: 30px;
    }

    .content {
        padding: 22px 18px;
    }

    .content h1 {
        font-size: 28px;
    }

    .content h2 {
        font-size: 21px;
    }

    .footer-inner {
        flex-direction: column;
    }
}