/* ==========================================================================
   Known Framework 官方网站 - 全局样式表 (app.css)
   ==========================================================================
   设计原则：
   1. 使用 CSS 自定义属性（变量）实现浅色/深色主题切换
   2. 以 known- 为前缀命名所有自定义 class，避免冲突
   3. 响应式断点：1180px / 920px / 768px / 480px
   4. 卡片式 UI 设计，使用 backdrop-filter 毛玻璃效果
   ========================================================================== */

/* ==========================================================================
   1. 主题变量定义
   ========================================================================== */

/* ---- 浅色主题（默认） ---- */
:root {
    color-scheme: light;

    /* 背景色系 */
    --known-bg: #f4f7fb;                           /* 全局背景 */
    --known-bg-elevated: rgba(255, 255, 255, .82); /* 抬升元素背景（毛玻璃） */
    --known-bg-panel: #ffffff;                     /* 面板/卡片背景 */
    --known-bg-soft: #eef4fb;                      /* 柔和背景 */
    --known-bg-strong: #0f172a;                    /* 强调背景（深色） */

    /* 文字色系 */
    --known-text: #0f172a;                         /* 主要文字 */
    --known-text-muted: #52607a;                   /* 次要文字 */
    --known-text-subtle: #7b879c;                  /* 弱化文字 */

    /* 边框色系 */
    --known-border: rgba(15, 23, 42, .08);         /* 默认边框 */
    --known-border-strong: rgba(37, 99, 235, .18); /* 强调边框（蓝色调） */

    /* 主色调 */
    --known-primary: #2563eb;                      /* 蓝色主色 */
    --known-primary-soft: rgba(37, 99, 235, .1);   /* 主色柔和背景 */
    --known-primary-strong: #1d4ed8;               /* 主色强调 */

    /* 阴影 */
    --known-shadow: 0 20px 60px rgba(15, 23, 42, .08);      /* 大阴影 */
    --known-shadow-soft: 0 8px 30px rgba(15, 23, 42, .06);  /* 柔和阴影 */

    /* 代码块 */
    --known-code-bg: #0f172a;                      /* 代码块背景 */
    --known-code-text: #e2e8f0;                    /* 代码块文字 */

    /* 导航栏 */
    --known-nav-bg: rgba(255, 255, 255, .82);      /* 导航栏背景（毛玻璃） */

    /* 英雄区渐变 */
    --known-hero-grad-a: rgba(37, 99, 235, .1);    /* 蓝色渐变 */
    --known-hero-grad-b: rgba(56, 189, 248, .08);  /* 天蓝渐变 */
}

/* ---- 深色主题 ---- */
:root[data-theme='dark'] {
    color-scheme: dark;

    --known-bg: #07111f;
    --known-bg-elevated: rgba(12, 18, 31, .82);
    --known-bg-panel: #0b1220;
    --known-bg-soft: #10192b;
    --known-bg-strong: #020617;
    --known-text: #e6edf7;
    --known-text-muted: #9daecc;
    --known-text-subtle: #7f91af;
    --known-border: rgba(148, 163, 184, .12);
    --known-border-strong: rgba(96, 165, 250, .24);
    --known-primary: #60a5fa;
    --known-primary-soft: rgba(96, 165, 250, .14);
    --known-primary-strong: #93c5fd;
    --known-shadow: 0 24px 80px rgba(2, 6, 23, .45);
    --known-shadow-soft: 0 12px 40px rgba(2, 6, 23, .3);
    --known-code-bg: #020817;
    --known-code-text: #dbeafe;
    --known-nav-bg: rgba(7, 17, 31, .76);
    --known-hero-grad-a: rgba(37, 99, 235, .24);
    --known-hero-grad-b: rgba(14, 165, 233, .18);
}

/* ==========================================================================
   2. 基础重置与全局样式
   ========================================================================== */

html,
body {
    margin: 0;
    background: var(--known-bg);
    color: var(--known-text);
    font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    transition: background .25s ease, color .25s ease;  /* 主题切换时的平滑过渡 */
}

a {
    color: inherit;
    text-decoration: none;
}

code,
pre {
    font-family: 'Cascadia Code', 'Consolas', 'Courier New', monospace;
}

/* ==========================================================================
   3. 页面外壳布局
   ========================================================================== */

/* 最外层容器：带渐变背景的全屏高度 */
.known-site {
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, var(--known-hero-grad-a), transparent 30%),
        radial-gradient(circle at top right, var(--known-hero-grad-b), transparent 28%),
        linear-gradient(180deg, color-mix(in srgb, var(--known-bg) 88%, #ffffff 12%) 0%, var(--known-bg) 100%);
}

/* 公用约束：主内容区、导航、页脚、文档区宽度一致 */
.known-site-main,
.known-site-nav,
.known-site-footer,
.known-site-docs-main {
    width: min(1240px, calc(100% - 48px));
    margin: 0 auto;
}

/* ==========================================================================
   4. 导航栏 (SiteNav)
   ========================================================================== */

/* 粘性定位，滚动时固定在顶部 */
.known-site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 22px 0 0;
}

/* 导航栏内栏：毛玻璃效果 + 圆角卡片 */
.known-site-nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    min-height: 72px;
    padding: 0 18px;
    border: 1px solid var(--known-border);
    border-radius: 22px;
    background: var(--known-nav-bg);
    backdrop-filter: blur(18px);
    box-shadow: var(--known-shadow-soft);
}

/* 品牌 Logo + 名称 */
.known-site-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--known-text);
}

/* 品牌标记（字母 "H" 图标） */
.known-site-brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--known-primary), #38bdf8);
    color: #fff;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .25);
}

.known-site-nav-links,
.known-site-nav-actions,
.known-page-actions,
.known-home-proof,
.known-card-grid,
.known-flow-grid,
.known-site-footer-grid,
.known-docs-pager,
.known-site-docs-main,
.known-page-heading,
.known-cta-card,
.known-architecture-stack {
    display: grid;
}

/* 导航链接列表（水平排列） */
.known-site-nav-links {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    align-items: center;
    gap: 6px;
}

/* 单个导航链接 */
.known-site-nav-link {
    padding: 10px 14px;
    border-radius: 12px;
    color: var(--known-text-muted);
    font-size: .95rem;
    transition: background .2s ease, color .2s ease;
}

/* 导航链接悬停/激活状态 */
.known-site-nav-link:hover,
.known-site-nav-link.active {
    color: var(--known-text);
    background: var(--known-primary-soft);
}

/* 右侧操作区（主题切换等） */
.known-site-nav-actions {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 10px;
    align-items: center;
}

/* 通用按钮样式：主题切换、GitHub 链接、站点按钮 */
.known-theme-toggle,
.known-site-nav-github,
.known-site-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border-radius: 12px;
    border: 1px solid var(--known-border);
    background: var(--known-bg-panel);
    color: var(--known-text);
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease, transform .2s ease;
}

.known-theme-toggle:hover,
.known-site-nav-github:hover,
.known-site-btn:hover,
.known-card-link:hover {
    transform: translateY(-1px);
    border-color: var(--known-border-strong);
}

/* 主题切换按钮（方形容器） */
.known-theme-toggle {
    font: inherit;
    width: 42px;
    min-width: 42px;
    padding: 0;
}

/* 浅色/深色图标切换：深色主题下显示月亮，浅色主题下显示太阳 */
.known-theme-toggle-dark,
:root[data-theme='dark'] .known-theme-toggle-light {
    display: inline-flex;
}
.known-theme-toggle-light,
:root[data-theme='dark'] .known-theme-toggle-dark {
    display: none;
}

.known-theme-toggle i,
.known-site-nav-menu i {
    font-size: 1rem;
    line-height: 1;
}

/* 移动端汉堡菜单按钮（默认隐藏，<920px 显示） */
.known-site-nav-menu {
    display: none;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--known-border);
    border-radius: 12px;
    background: var(--known-bg-panel);
    color: var(--known-text);
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease, transform .2s ease;
}

.known-site-nav-menu:hover {
    transform: translateY(-1px);
    border-color: var(--known-border-strong);
}

/* 主按钮（primary）渐变填充 */
.known-site-btn.primary {
    border-color: transparent;
    background: linear-gradient(135deg, var(--known-primary), #38bdf8);
    color: #fff;
}

/* ==========================================================================
   5. 页面内容区通用布局
   ========================================================================== */

/* 页面内容容器（屏宽约束） */
.known-page-shell {
    width: min(1240px, calc(100% - 48px));
    margin: 0 auto;
}

/* 主内容区上下间距 */
.known-site-main {
    padding: 28px 0 88px;
}

.known-home-hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-height: calc(100vh - 180px);
    justify-content: center;
    padding: 48px 0 34px;
}

.known-home-hero-panel,
.known-card,
.known-hero-panel-card,
.known-docs-sidebar-card,
.known-docs-markdown,
.known-docs-hero,
.known-docs-empty,
.known-docs-pager-link,
.known-docs-toc-card,
.known-architecture-layer,
.known-cta-card {
    border: 1px solid var(--known-border);
    border-radius: 28px;
    background: var(--known-bg-elevated);
    box-shadow: var(--known-shadow);
    backdrop-filter: blur(18px);
}

/* 卡片内边距统一 */
.known-docs-sidebar-card,
.known-docs-markdown,
.known-docs-hero,
.known-docs-empty,
.known-docs-pager-link,
.known-card,
.known-hero-panel-card,
.known-cta-card,
.known-architecture-layer,
.known-docs-toc-card {
    padding: 32px;
}

/* 徽章/标签：圆角药丸形状 */
.known-page-kicker,
.known-card-tag,
.known-site-eyebrow {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--known-primary-soft);
    color: var(--known-primary-strong);
    font-size: .82rem;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.known-home-hero-copy h1,
.known-page-heading h1,
.known-docs-hero h1 {
    margin: 18px 0 16px;
    color: var(--known-text);
    font-size: clamp(2.5rem, 5vw, 4.6rem);
    line-height: 1.02;
}

.known-page-heading h1,
.known-docs-hero h1 {
    font-size: clamp(2.2rem, 4vw, 3.4rem);
}

.known-home-hero-copy p,
.known-page-heading p,
.known-section-head p,
.known-card p,
.known-site-footer-copy,
.known-docs-sidebar-head p,
.known-docs-hero p,
.known-docs-markdown p,
.known-docs-markdown li,
.known-docs-markdown blockquote {
    margin: 0;
    color: var(--known-text-muted);
    line-height: 1.85;
}

.known-page-actions {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 12px;
    margin-top: 28px;
    justify-content: start;
}

/* ==========================================================================
   6. 首页英雄区（Hero）
   ========================================================================== */

.known-home-stats,
.known-showcase-band,
.known-feature-hero-grid {
    display: grid;
    gap: 14px;
}

.known-home-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 22px;
}

.known-home-stats article,
.known-showcase-band article,
.known-feature-hero-card {
    padding: 18px;
    border-radius: 18px;
    border: 1px solid var(--known-border);
    background: color-mix(in srgb, var(--known-bg-panel) 72%, transparent 28%);
}

.known-home-stats strong,
.known-showcase-band strong,
.known-feature-hero-card strong {
    display: block;
    margin: 12px 0 6px;
    color: var(--known-text);
}

.known-home-stats strong {
    font-size: 1.8rem;
}

.known-home-stats span,
.known-showcase-band span,
.known-feature-hero-card span {
    color: var(--known-text-muted);
    line-height: 1.7;
    font-size: .94rem;
}

.known-home-proof {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 32px;
}

.known-showcase-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 26px;
}

.known-proof-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 22px;
    border-radius: 20px;
    background: var(--known-bg-elevated);
    border: 1px solid var(--known-border);
    box-shadow: var(--known-shadow-soft);
    backdrop-filter: blur(18px);
    cursor: pointer;
    transition: transform .3s cubic-bezier(.34,1.56,.64,1), border-color .3s ease, box-shadow .3s ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.known-proof-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 20px;
    opacity: 0;
    transition: opacity .3s ease;
    background: linear-gradient(135deg, var(--known-primary-soft), transparent 60%);
}

.known-proof-card:hover {
    transform: translateY(-4px) scale(1.01);
    border-color: var(--known-border-strong);
    box-shadow: 0 24px 60px rgba(37, 99, 235, .12);
}

.known-proof-card:hover::before {
    opacity: 1;
}

.known-proof-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    min-width: 52px;
    height: 52px;
    border-radius: 16px;
    font-size: 1.2rem;
    color: #fff;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .25);
    position: relative;
    z-index: 1;
}

.known-proof-icon-web {
    background: linear-gradient(135deg, #2563eb, #38bdf8);
}

.known-proof-icon-desktop {
    background: linear-gradient(135deg, #7c3aed, #c084fc);
}

.known-proof-icon-app {
    background: linear-gradient(135deg, #059669, #34d399);
}

.known-proof-body {
    flex: 1;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.known-proof-body strong {
    display: block;
    margin-bottom: 4px;
    color: var(--known-text);
    font-size: 1.05rem;
}

.known-proof-body span {
    display: block;
    color: var(--known-text-muted);
    font-size: .88rem;
    line-height: 1.5;
}

.known-proof-action {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 12px;
    background: var(--known-primary-soft);
    color: var(--known-primary-strong);
    font-size: .85rem;
    font-weight: 600;
    white-space: nowrap;
    transition: background .2s ease, transform .2s ease;
    position: relative;
    z-index: 1;
}

.known-proof-card:hover .known-proof-action {
    background: var(--known-primary);
    color: #fff;
    transform: scale(1.04);
}

.known-flow-step,
.known-docs-pager-link strong {
    display: block;
    margin-bottom: 8px;
    color: var(--known-text);
}

.known-flow-step p,
.known-docs-pager-link span {
    color: var(--known-text-muted);
    font-size: .95rem;
    line-height: 1.7;
}

.known-home-hero-panel {
    gap: 20px;
}

.known-code-card pre,
.known-docs-markdown pre {
    margin: 0;
    padding: 18px;
    overflow: auto;
    border-radius: 18px;
    background: var(--known-code-bg);
    color: var(--known-code-text);
    border: 1px solid color-mix(in srgb, var(--known-border-strong) 80%, transparent 20%);
    line-height: 1.75;
}

.known-code-block pre code {
    display: block;
    color: var(--known-code-text);
    white-space: pre;
}

.known-token.keyword {
    color: #93c5fd;
}

.known-token.type {
    color: #67e8f9;
}

.known-token.string {
    color: #f9a8d4;
}

.known-token.number {
    color: #fbbf24;
}

.known-token.comment {
    color: #94a3b8;
}

.known-token.tag {
    color: #c084fc;
}

.known-token.attr {
    color: #86efac;
}

.known-page-intro {
    padding: 48px 0 16px;
}

.known-notfound-page {
    min-height: 52vh;
    display: grid;
    align-content: center;
    gap: 24px;
}

.known-feature-hero-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 28px;
}

.known-page-heading {
    gap: 12px;
    max-width: 900px;
}

.known-page-section {
    padding: 18px 0 22px;
}

.known-section-head {
    max-width: 860px;
    margin-bottom: 24px;
}

.known-section-head span {
    color: var(--known-primary-strong);
    font-size: .88rem;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.known-section-head h2,
.known-cta-card h2 {
    margin: 12px 0;
    color: var(--known-text);
    font-size: clamp(1.9rem, 3.4vw, 3rem);
    line-height: 1.15;
}

/* ==========================================================================
   7. 卡片网格系统
   ========================================================================== */

.known-card-grid {
    gap: 20px;
}

.known-card-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.known-card-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.known-card-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 通用卡片容器（flex 列布局） */
.known-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.known-card > .known-glyph,
.known-flow-step > .known-glyph,
.known-feature-hero-card > .known-glyph,
.known-showcase-band article > .known-glyph,
.known-home-stats article > .known-glyph {
    margin-bottom: 4px;
}

.known-glyph {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 16px;
    font-size: .86rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18);
}

.known-glyph i {
    font-size: 1.1rem;
}

.known-glyph.tone-blue {
    background: linear-gradient(135deg, #2563eb, #38bdf8);
    color: #fff;
}

.known-glyph.tone-cyan {
    background: linear-gradient(135deg, #0891b2, #22d3ee);
    color: #ecfeff;
}

.known-glyph.tone-violet {
    background: linear-gradient(135deg, #7c3aed, #c084fc);
    color: #faf5ff;
}

.known-glyph.tone-amber {
    background: linear-gradient(135deg, #d97706, #fbbf24);
    color: #fff7ed;
}

.known-card h3,
.known-hero-panel-card h3,
.known-architecture-layer h3,
.known-docs-sidebar-head h2,
.known-docs-nav-section h3,
.known-docs-toc-card h3 {
    margin: 0;
    color: var(--known-text);
}

.known-card-highlight {
    background: linear-gradient(180deg, color-mix(in srgb, var(--known-primary-soft) 50%, var(--known-bg-elevated) 50%), var(--known-bg-elevated));
}

.known-card-link {
    transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.known-inline-link {
    color: var(--known-primary-strong);
    font-weight: 600;
}

.known-list {
    margin: 0;
    padding-left: 18px;
    color: var(--known-text-muted);
    line-height: 1.9;
}

.known-flow-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.known-flow-step strong {
    color: var(--known-primary-strong);
    font-size: .95rem;
}

.known-flow-step h3 {
    margin: 0 0 10px;
    color: var(--known-text);
}

.known-architecture-stack {
    gap: 14px;
}

.known-architecture-layer {
    display: grid;
    grid-template-columns: 180px minmax(220px, 320px) minmax(0, 1fr);
    gap: 20px;
    align-items: center;
}

.known-architecture-layer span {
    color: var(--known-primary-strong);
    font-size: .9rem;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.known-page-cta-section {
    padding-top: 28px;
}

.known-cta-card {
    grid-template-columns: minmax(0, 1fr) max-content;
    gap: 20px;
    align-items: center;
}

/* ==========================================================================
   8. 页脚 (SiteFooter)
   ========================================================================== */

.known-site-footer {
    padding: 24px 0 36px;
}

.known-site-footer-grid {
    grid-template-columns: 1.4fr repeat(3, minmax(0, .7fr));
    gap: 24px;
    padding: 28px 32px;
    border: 1px solid var(--known-border);
    border-radius: 28px;
    background: var(--known-bg-elevated);
    box-shadow: var(--known-shadow-soft);
}

.known-site-footer-grid h4 {
    margin: 0 0 12px;
    color: var(--known-text);
}

.known-site-footer-grid a,
.known-site-footer-copy,
.known-site-footer-meta {
    color: var(--known-text-muted);
}

.known-site-footer-grid a {
    display: block;
    margin-bottom: 10px;
}

.known-site-footer-meta {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding: 16px 4px 0;
    font-size: .94rem;
}

/* ==========================================================================
   9. 文档中心 (Docs)
   ========================================================================== */

/* 文档页特殊背景 */
.known-site-docs-shell {
    background:
        radial-gradient(circle at top right, var(--known-hero-grad-a), transparent 30%),
        linear-gradient(180deg, color-mix(in srgb, var(--known-bg) 92%, #ffffff 8%) 0%, var(--known-bg) 100%);
}

/* 文档页三栏布局：侧边栏(300px) + 内容(自适应) + 目录(240px) */
.known-site-docs-main {
    grid-template-columns: 300px minmax(0, 1fr) 240px;
    gap: 24px;
    padding: 28px 0 60px;
}

.known-docs-sidebar-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    border: 1px solid var(--known-border);
    border-radius: 14px;
    background: var(--known-bg-elevated);
    color: var(--known-text);
    font: inherit;
    font-size: .9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease;
    backdrop-filter: blur(18px);
}

.known-docs-sidebar-toggle:hover {
    border-color: var(--known-border-strong);
}

.known-docs-sidebar-backdrop {
    display: none;
}

.known-docs-sidebar-close {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    margin-left: auto;
    border: 1px solid var(--known-border);
    border-radius: 10px;
    background: var(--known-bg-panel);
    color: var(--known-text);
    cursor: pointer;
    font: inherit;
    transition: background .2s ease;
}

.known-docs-sidebar-close:hover {
    background: var(--known-primary-soft);
}

.known-docs-sidebar,
.known-docs-toc {
    position: sticky;
    top: 100px;
    align-self: start;
}

.known-docs-sidebar-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
    max-height: calc(100vh - 120px);
    overflow: auto;
}

.known-docs-search-box {
    position: sticky;
    top: 0;
    z-index: 1;
    padding-bottom: 4px;
    background: linear-gradient(180deg, var(--known-bg-elevated), color-mix(in srgb, var(--known-bg-elevated) 94%, transparent 6%));
}

.known-docs-search-input {
    width: 100%;
    box-sizing: border-box;
    min-height: 44px;
    padding: 0 14px;
    border: 1px solid var(--known-border);
    border-radius: 14px;
    outline: none;
    background: var(--known-bg-panel);
    color: var(--known-text);
    font: inherit;
}

.known-docs-search-input:focus {
    border-color: var(--known-border-strong);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--known-primary-soft) 60%, transparent 40%);
}

.known-docs-nav-wrap {
    display: grid;
    gap: 20px;
}

.known-docs-nav-group {
    border: 1px solid var(--known-border);
    border-radius: 18px;
    background: color-mix(in srgb, var(--known-bg-panel) 65%, transparent 35%);
    overflow: hidden;
}

.known-docs-nav-summary {
    display: block;
    padding: 14px 16px;
    cursor: pointer;
    color: var(--known-text);
    font-weight: 700;
    list-style: none;
}

.known-docs-nav-summary::-webkit-details-marker {
    display: none;
}

.known-docs-nav-summary::after {
    content: '+';
    float: right;
    color: var(--known-text-subtle);
}

.known-docs-nav-group[open] .known-docs-nav-summary::after {
    content: '-';
}

.known-docs-nav-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 12px 12px;
}

.known-docs-link,
.known-docs-toc-link {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--known-text-muted);
    transition: background .2s ease, color .2s ease;
}

.known-docs-link:hover,
.known-docs-link.active,
.known-docs-toc-link:hover {
    background: var(--known-primary-soft);
    color: var(--known-text);
}

.known-docs-link.active {
    font-weight: 700;
}

.known-docs-link strong,
.known-docs-link span {
    display: block;
}

.known-docs-search-group {
    display: grid;
    gap: 8px;
    padding-top: 10px;
    border-top: 1px solid var(--known-border);
}

.known-docs-search-group:first-of-type {
    padding-top: 0;
    border-top: 0;
}

.known-docs-search-group h4 {
    margin: 0;
    color: var(--known-text);
    font-size: .9rem;
}

.known-docs-link mark {
    padding: 0 2px;
    border-radius: 4px;
    background: color-mix(in srgb, var(--known-primary) 22%, transparent 78%);
    color: var(--known-text);
}

.known-docs-link span,
.known-docs-search-empty,
.known-docs-hero-path {
    color: var(--known-text-subtle);
    font-size: .85rem;
}

.known-docs-content-wrap {
    display: grid;
    gap: 20px;
}

.known-docs-hero-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.known-docs-markdown {
    overflow: hidden;
}

.known-docs-markdown > :first-child {
    margin-top: 0;
}

.known-docs-markdown h1,
.known-docs-markdown h2,
.known-docs-markdown h3,
.known-docs-markdown h4 {
    color: var(--known-text);
    line-height: 1.25;
}

.known-docs-markdown h2,
.known-docs-markdown h3 {
    scroll-margin-top: 120px;
}

.known-docs-markdown h2 {
    margin-top: 34px;
    padding-top: 16px;
    border-top: 1px solid var(--known-border);
    font-size: 1.45rem;
}

.known-docs-markdown a {
    color: var(--known-primary-strong);
}

.known-docs-markdown hr {
    border: 0;
    border-top: 1px solid var(--known-border);
    margin: 28px 0;
}

.known-docs-markdown table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0;
    border-radius: 14px;
    overflow: hidden;
}

.known-docs-markdown th,
.known-docs-markdown td {
    padding: 12px 14px;
    border: 1px solid var(--known-border);
    text-align: left;
}

.known-docs-markdown th {
    background: var(--known-primary-soft);
    color: var(--known-text);
}

.known-docs-markdown :not(pre) > code {
    padding: 2px 6px;
    border-radius: 8px;
    background: color-mix(in srgb, var(--known-bg-soft) 80%, transparent 20%);
    color: var(--known-text);
}

.known-docs-pager {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.known-docs-pager-link.align-right {
    text-align: right;
}

.known-docs-toc-card h3 {
    margin-top: 12px;
}

.known-docs-toc-link.level-2 {
    padding-left: 24px;
}

.known-docs-toc-link.level-3 {
    padding-left: 36px;
    font-size: .9rem;
}

@media screen and (max-width: 1180px) {
    .known-card-grid-4,
    .known-card-grid-3,
    .known-flow-grid,
    .known-home-proof,
    .known-home-stats,
    .known-showcase-band,
    .known-feature-hero-grid,
    .known-feature-grid,
    .known-site-footer-grid,
    .known-cta-card,
    .known-site-docs-main {
        grid-template-columns: 1fr 1fr;
    }

    .known-site-docs-main {
        grid-template-columns: 300px minmax(0, 1fr);
    }

    .known-docs-toc {
        display: none;
    }

    .known-architecture-layer {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 920px) {
    .known-site-nav-bar {
        flex-wrap: wrap;
        align-items: center;
        padding: 16px;
        gap: 12px;
    }

    .known-site-nav-menu {
        display: inline-flex;
        margin-left: auto;
    }

    .known-site-nav-links,
    .known-site-nav-actions,
    .known-page-actions,
    .known-home-stats,
    .known-showcase-band,
    .known-feature-hero-grid,
    .known-feature-grid,
    .known-card-grid-2,
    .known-card-grid-3,
    .known-card-grid-4,
    .known-flow-grid,
    .known-site-footer-grid,
    .known-docs-pager,
    .known-site-docs-main,
    .known-cta-card,
    .known-home-proof {
        grid-template-columns: 1fr;
        grid-auto-flow: row;
    }

    .known-site-nav-links {
        display: none;
        width: 100%;
        opacity: 0;
        transform: translateY(-8px);
        transition: opacity .2s ease, transform .2s ease;
        gap: 8px;
    }

    .known-site-nav-actions {
        display: none;
        width: 100%;
        opacity: 0;
        transform: translateY(-8px);
        transition: opacity .2s ease, transform .2s ease;
        grid-template-columns: 42px minmax(0, 1fr);
        gap: 10px;
        align-items: center;
    }

    .known-site-nav-links.is-open,
    .known-site-nav-actions.is-open {
        display: grid;
        opacity: 1;
        transform: translateY(0);
    }

    .known-site-nav-links.is-open {
        margin-top: 12px;
        padding-top: 12px;
        border-top: 1px solid var(--known-border);
    }

    .known-site-nav-link,
    .known-site-nav-github {
        width: 100%;
        box-sizing: border-box;
    }

    .known-site-nav-github {
        min-height: 42px;
    }

    .known-theme-toggle {
        justify-self: start;
    }

    .known-docs-sidebar,
    .known-docs-toc {
        position: static;
    }

    .known-docs-sidebar-card {
        max-height: none;
    }
}

@media screen and (max-width: 768px) {
    .known-site-main,
    .known-site-nav,
    .known-site-footer,
    .known-site-docs-main,
    .known-page-shell {
        width: min(100%, calc(100% - 28px));
    }

    .known-docs-sidebar-card,
    .known-docs-markdown,
    .known-docs-hero,
    .known-docs-empty,
    .known-docs-pager-link,
    .known-card,
    .known-hero-panel-card,
    .known-cta-card,
    .known-architecture-layer,
    .known-docs-toc-card {
        padding: 22px;
        border-radius: 22px;
    }

    .known-home-hero-copy h1,
    .known-page-heading h1,
    .known-docs-hero h1 {
        font-size: 2.2rem;
    }

    .known-home-hero {
        min-height: auto;
        padding: 32px 0 24px;
    }

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

    .known-docs-markdown table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: .88rem;
    }

    .known-docs-markdown table th,
    .known-docs-markdown table td {
        white-space: nowrap;
    }

    .known-docs-markdown pre {
        font-size: .88rem;
    }

    .known-docs-sidebar-toggle {
        display: inline-flex;
        margin-bottom: 12px;
    }

    .known-docs-sidebar-close {
        display: inline-flex;
    }

    .known-docs-sidebar-head {
        display: flex;
        flex-wrap: wrap;
        align-items: flex-start;
    }

    .known-docs-sidebar-head .known-site-eyebrow,
    .known-docs-sidebar-head h2,
    .known-docs-sidebar-head p {
        width: 100%;
    }

    .known-docs-sidebar {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        z-index: 100;
        padding: 16px;
        background: var(--known-bg);
        overflow: auto;
    }

    .known-docs-sidebar.is-open {
        display: block;
    }

    .known-docs-sidebar .known-docs-sidebar-card {
        max-height: none;
        border: none;
        box-shadow: none;
        background: none;
        padding: 0;
    }

    .known-docs-content-wrap {
        grid-column: 1 / -1;
    }

    .known-architecture-layer {
        grid-template-columns: 1fr;
        gap: 12px;
        text-align: center;
    }

    .known-architecture-layer .known-glyph {
        margin: 0 auto;
    }

    .known-proof-card {
        flex-direction: column;
        text-align: center;
        padding: 24px 18px;
    }

    .known-proof-action {
        width: 100%;
        justify-content: center;
    }

    .known-feature-card {
        padding: 22px 18px;
    }

    .known-site::before,
    .known-site::after,
    .known-home-hero::after {
        display: none;
    }

    .known-brand-visual {
        min-height: 280px;
    }

    .known-brand-orbit-b,
    .known-brand-node-left,
    .known-brand-node-right {
        display: none;
    }

    .known-page-actions {
        grid-auto-flow: row;
        grid-auto-columns: 1fr;
    }

    .known-site-btn {
        width: 100%;
        justify-content: center;
    }
}

@media screen and (max-width: 480px) {
    .known-site-main,
    .known-site-nav,
    .known-site-footer,
    .known-site-docs-main,
    .known-page-shell {
        width: calc(100% - 16px);
    }

    .known-site-nav-bar {
        padding: 10px 12px;
        min-height: 52px;
        border-radius: 16px;
        gap: 8px;
    }

    .known-site-brand {
        font-size: 1rem;
    }

    .known-site-brand-mark {
        width: 30px;
        height: 30px;
        border-radius: 10px;
        font-size: .82rem;
    }

    .known-site-nav-menu {
        width: 36px;
        height: 36px;
    }

    .known-docs-sidebar-card,
    .known-docs-markdown,
    .known-docs-hero,
    .known-docs-empty,
    .known-docs-pager-link,
    .known-card,
    .known-hero-panel-card,
    .known-cta-card,
    .known-architecture-layer,
    .known-docs-toc-card {
        padding: 16px;
        border-radius: 16px;
    }

    .known-home-hero-copy h1,
    .known-docs-hero h1 {
        font-size: 1.7rem;
    }

    .known-page-heading h1 {
        font-size: 1.55rem;
    }

    .known-section-head h2,
    .known-cta-card h2 {
        font-size: 1.4rem;
    }

    .known-home-hero {
        padding: 20px 0 16px;
        min-height: auto;
    }

    .known-home-proof {
        gap: 10px;
        margin-top: 20px;
    }

    .known-proof-card {
        padding: 14px 12px;
        gap: 10px;
    }

    .known-proof-icon {
        width: 40px;
        min-width: 40px;
        height: 40px;
        font-size: .9rem;
        border-radius: 12px;
    }

    .known-proof-body strong {
        font-size: .95rem;
    }

    .known-proof-body span {
        font-size: .82rem;
    }

    .known-proof-action {
        padding: 6px 12px;
        font-size: .8rem;
    }

    .known-site-main {
        padding: 12px 0 36px;
    }

    .known-home-features {
        padding: 20px 0 32px;
    }

    .known-feature-grid {
        gap: 10px;
        margin-top: 16px;
    }

    .known-feature-card {
        padding: 16px 14px;
        border-radius: 18px;
    }

    .known-feature-card h3 {
        margin: 12px 0 6px;
        font-size: .9rem;
    }

    .known-feature-card p {
        font-size: .82rem;
    }

    .known-cta-card {
        padding: 18px 16px;
        gap: 14px;
    }

    .known-section-head {
        margin-bottom: 14px;
    }

    .known-section-head h2 {
        margin: 8px 0;
    }

    .known-page-intro {
        padding: 20px 0 10px;
    }

    .known-site-footer {
        padding: 12px 0 20px;
    }

    .known-site-footer-grid {
        padding: 18px 14px;
        gap: 14px;
        border-radius: 20px;
    }

    .known-site-footer-grid h4 {
        margin-bottom: 8px;
        font-size: .9rem;
    }

    .known-site-footer-grid a {
        font-size: .88rem;
        margin-bottom: 6px;
    }

    .known-site-footer-copy {
        font-size: .85rem;
    }

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

    .known-download-card {
        padding: 16px;
        border-radius: 18px;
    }

    .known-download-card-icon {
        width: 40px;
        min-width: 40px;
        height: 40px;
        font-size: .95rem;
        border-radius: 12px;
    }

    .known-card-grid {
        gap: 12px;
    }

    .known-flow-grid {
        gap: 12px;
    }

    .known-flow-step {
        padding: 0;
    }

    .known-page-actions {
        margin-top: 18px;
        gap: 8px;
    }

    .known-site-btn {
        min-height: 38px;
        font-size: .88rem;
    }

    .known-docs-markdown {
        font-size: .92rem;
    }

    .known-docs-markdown h2 {
        font-size: 1.15rem;
    }

    .known-docs-markdown pre {
        font-size: .82rem;
        padding: 12px;
        border-radius: 14px;
    }

    .known-docs-pager {
        font-size: .88rem;
    }

    .known-feature-hero-grid {
        margin-top: 16px;
    }

    .known-list {
        font-size: .88rem;
        line-height: 1.7;
    }

    .known-page-heading {
        gap: 8px;
    }

    .known-page-kicker,
    .known-card-tag,
    .known-site-eyebrow {
        font-size: .75rem;
        padding: 5px 10px;
    }

    .known-glyph {
        width: 42px;
        height: 42px;
        font-size: .75rem;
        border-radius: 12px;
    }

    .known-glyph i {
        font-size: .95rem;
    }
}

.known-home-hero {
    position: relative;
    overflow: hidden;
}

.known-home-hero-bg {
    position: absolute;
    inset: -60px -60px auto -60px;
    height: 680px;
    background:
        radial-gradient(ellipse 70% 60% at 20% 30%, var(--known-hero-grad-a), transparent 65%),
        radial-gradient(ellipse 60% 50% at 80% 40%, var(--known-hero-grad-b), transparent 60%);
    pointer-events: none;
    mask-image: linear-gradient(180deg, #000 45%, transparent 92%);
    -webkit-mask-image: linear-gradient(180deg, #000 45%, transparent 92%);
}

.known-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px 6px 10px;
    border-radius: 999px;
    background: var(--known-primary-soft);
    color: var(--known-primary-strong);
    font-size: .82rem;
    font-weight: 600;
    border: 1px solid var(--known-border-strong);
    backdrop-filter: blur(4px);
}

.known-hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--known-primary);
    animation: knownPulse 2s ease-in-out infinite;
}

.known-site-nav-dropdown {
    position: relative;
}

.known-site-nav-dropdown-toggle {
    gap: 6px;
    cursor: pointer;
    font: inherit;
    border: 0;
    background: none;
    white-space: nowrap;
}

.known-site-nav-dropdown-toggle i {
    font-size: .7rem;
    transition: transform .2s ease;
}

.known-site-nav-dropdown.is-open .known-site-nav-dropdown-toggle i {
    transform: rotate(180deg);
}

.known-site-nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 180px;
    padding: 8px;
    border: 1px solid var(--known-border);
    border-radius: 16px;
    background: var(--known-nav-bg);
    backdrop-filter: blur(18px);
    box-shadow: var(--known-shadow);
    z-index: 30;
}

.known-site-nav-dropdown.is-open .known-site-nav-dropdown-menu {
    display: block;
}

.known-site-nav-dropdown-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 12px;
    color: var(--known-text-muted);
    font-size: .95rem;
    transition: background .2s ease, color .2s ease;
}

.known-site-nav-dropdown-link:hover,
.known-site-nav-dropdown-link.active {
    color: var(--known-text);
    background: var(--known-primary-soft);
}

.known-site-nav-dropdown-link i {
    width: 20px;
    text-align: center;
}

@media screen and (max-width: 920px) {
    .known-site-nav-dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        padding: 0 0 0 20px;
        background: none;
        backdrop-filter: none;
    }

    .known-site-nav-dropdown-toggle {
        width: 100%;
        justify-content: flex-start;
    }
}

.known-text-gradient {
    background: linear-gradient(135deg, var(--known-primary), #38bdf8, #c084fc);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.known-home-features {
    padding: 40px 0 60px;
}

.known-feature-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    margin-top: 28px;
}

.known-feature-card {
    padding: 28px 24px;
    border-radius: 22px;
    border: 1px solid var(--known-border);
    background: var(--known-bg-elevated);
    box-shadow: var(--known-shadow-soft);
    backdrop-filter: blur(18px);
    transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.known-feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--known-border-strong);
    box-shadow: var(--known-shadow);
}

.known-feature-card h3 {
    margin: 16px 0 8px;
    color: var(--known-text);
    font-size: 1.1rem;
}

.known-feature-card p {
    margin: 0;
    color: var(--known-text-muted);
    font-size: .92rem;
    line-height: 1.7;
}

.known-home-cta {
    padding-bottom: 40px;
}

.known-download-hero {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 60px 0 40px;
}

.known-download-hero-bg {
    position: absolute;
    inset: -60px -60px auto -60px;
    height: 480px;
    background:
        radial-gradient(ellipse 60% 50% at 30% 30%, var(--known-hero-grad-a), transparent 60%),
        radial-gradient(ellipse 50% 40% at 70% 40%, var(--known-hero-grad-b), transparent 55%);
    pointer-events: none;
    mask-image: linear-gradient(180deg, #000 40%, transparent 88%);
    -webkit-mask-image: linear-gradient(180deg, #000 40%, transparent 88%);
}

.known-download-hero-body {
    position: relative;
}

.known-download-hero-body h1 {
    margin: 18px 0 16px;
    color: var(--known-text);
    font-size: clamp(2.2rem, 4vw, 3.6rem);
    line-height: 1.08;
}

.known-download-hero-body p {
    margin: 0;
    color: var(--known-text-muted);
    font-size: 1.1rem;
}

.known-download-list {
    padding: 0 0 60px;
}

.known-download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 18px;
    margin-top: 28px;
}

.known-download-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px;
    border-radius: 22px;
    border: 1px solid var(--known-border);
    background: var(--known-bg-elevated);
    box-shadow: var(--known-shadow-soft);
    backdrop-filter: blur(18px);
    transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.known-download-card:hover {
    transform: translateY(-3px);
    border-color: var(--known-border-strong);
    box-shadow: var(--known-shadow);
}

.known-download-card-head {
    display: flex;
    align-items: center;
    gap: 14px;
}

.known-download-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    min-width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--known-primary), #38bdf8);
    color: #fff;
    font-size: 1.1rem;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .25);
}

.known-download-card-meta {
    flex: 1;
    min-width: 0;
}

.known-download-card-meta strong {
    display: block;
    color: var(--known-text);
    font-size: 1.05rem;
    margin-bottom: 6px;
}

.known-download-card-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.known-download-tag {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 8px;
    background: var(--known-primary-soft);
    color: var(--known-primary-strong);
    font-size: .8rem;
    font-weight: 600;
}

.known-download-tag-size {
    background: color-mix(in srgb, var(--known-bg-soft) 80%, transparent 20%);
    color: var(--known-text-muted);
}

.known-download-card-desc {
    margin: 0;
    color: var(--known-text-muted);
    font-size: .92rem;
    line-height: 1.65;
    flex: 1;
}

.known-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 46px;
    padding: 0 20px;
    border-radius: 14px;
    border: 1px solid var(--known-border);
    background: var(--known-bg-panel);
    color: var(--known-text);
    font-weight: 600;
    font-size: .95rem;
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease, transform .2s ease;
    box-sizing: border-box;
}

.known-download-btn:hover {
    transform: translateY(-2px);
    border-color: var(--known-primary);
    background: var(--known-primary-soft);
    color: var(--known-primary-strong);
}

/* ==========================================================================
   10. 关键帧动画
   ========================================================================== */

@keyframes knownFloat {
    0%, 100% { transform: translate3d(0, 0, 0); }
    50% { transform: translate3d(18px, -22px, 0); }
}

/* 脉冲动画（用于首页徽章指示点） */
@keyframes knownPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: .6; transform: scale(1.3); }
}

@keyframes knownSpin {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes knownSpinReverse {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(-360deg); }
}