/* =================================================================
 * ui-ux-max · 全站统一增强样式表
 * 适用: apps/reading/ 目录下所有 HTML 页面
 * 版本: v1.0.0 · 2026-06-22
 *
 * 设计灵感:
 *   · apps/ai-tools/school/index.html(顶部导航/面包屑/Hero/资源网格/页脚)
 *   · DESIGN.md(Claude Editorial:暖米色画布 + 珊瑚 CTA + 衬线 Display)
 *   · ui-ux-pro_max(全局排版/可访问性/动效)
 *
 * 设计原则:
 *   1. 增量增强 — 不覆盖已有 design-system.css / md3-*.css / components.css / editorial-enhance.css
 *   2. 通用安全 — 所有规则走 CSS 自定义属性,可被页面级 :root 覆盖
 *   3. 零破坏 — 子页面主题色 / hero 渐变 / 章节背景 全部保留
 *   4. WCAG AA — 对比度、焦点态、prefers-reduced-motion 全覆盖
 *
 * 引入方式(已通过批量脚本注入):
 *   <link href="assets/styles/ui-ux-max.css" rel="stylesheet">
 *   (应放在 editorial-enhance.css 之后作为最终增强层)
 * ================================================================= */

/* ============================================
   1. 设计令牌 (Claude Editorial · 与 DESIGN.md 对齐)
   ============================================ */
:root {
    /* 字体栈:衬线 Display + 人文 Sans + 等宽 */
    --uux-font-display: 'Cormorant Garamond', 'EB Garamond', 'Tiempos Headline', 'Songti SC', 'Noto Serif SC', Georgia, serif;
    --uux-font-sans: 'Inter', 'StyreneB', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --uux-font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, monospace;

    /* 字号 (DESIGN.md typography) */
    --uux-fs-display-xl: 64px;
    --uux-fs-display-lg: 48px;
    --uux-fs-display-md: 36px;
    --uux-fs-display-sm: 28px;
    --uux-fs-title-lg: 22px;
    --uux-fs-title-md: 18px;
    --uux-fs-body-md: 16px;
    --uux-fs-body-sm: 14px;
    --uux-fs-caption: 13px;
    --uux-fs-caption-uppercase: 12px;

    /* 字距 (Display 必须负字距) */
    --uux-ls-display-xl: -1.5px;
    --uux-ls-display-lg: -1px;
    --uux-ls-display-md: -0.5px;
    --uux-ls-display-sm: -0.3px;
    --uux-ls-uppercase: 1.5px;

    /* 圆角分级 */
    --uux-r-md: 8px;
    --uux-r-lg: 12px;
    --uux-r-xl: 16px;
    --uux-r-pill: 9999px;

    /* 过渡 */
    --uux-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --uux-transition: all 0.25s var(--uux-ease);
    --uux-transition-fast: all 0.15s var(--uux-ease);

    /* 阴影 (极少使用 · 颜色块优先) */
    --uux-shadow-sm: 0 1px 3px rgba(20, 20, 19, 0.06);
    --uux-shadow-md: 0 4px 12px rgba(20, 20, 19, 0.08);
    --uux-shadow-lg: 0 8px 24px rgba(20, 20, 19, 0.10);
    --uux-shadow-coral: 0 4px 12px rgba(204, 120, 92, 0.25);

    /* 布局 */
    --uux-max-width: 1200px;
    --uux-max-width-narrow: 720px;
    --uux-header-h: 60px;
    --uux-breadcrumb-h: 40px;
}

/* ============================================
   2. 全局基线(字体渲染 + 选择态 + 滚动)
   ============================================ */

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--uux-font-sans);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

::selection {
    background-color: var(--brand-primary, #cc785c);
    color: var(--on-primary, #ffffff);
    -webkit-text-fill-color: var(--on-primary, #ffffff);
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--canvas, #faf9f5);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-cream-strong, #e8e0d2);
    border-radius: var(--uux-r-pill);
    transition: background var(--uux-transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--muted-soft, #8e8b82);
}

/* ============================================
   3. 排版(衬线 Display + 标题层级)
   ============================================ */

h1, h2, h3, h4, h5, h6,
.hero-title, .section-title, .featured-card-title,
.book-title, .gradient-text, .display-title {
    font-family: var(--uux-font-display);
    font-weight: 400;
    color: var(--ink, #141413);
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin: 0 0 0.5em;
}

h1, .display-xl {
    font-size: clamp(2rem, 5vw, var(--uux-fs-display-xl));
    letter-spacing: var(--uux-ls-display-xl);
    line-height: 1.1;
}

h2, .display-lg {
    font-size: clamp(1.6rem, 4vw, var(--uux-fs-display-lg));
    letter-spacing: var(--uux-ls-display-lg);
    line-height: 1.15;
}

h3, .display-md {
    font-size: clamp(1.4rem, 3.5vw, var(--uux-fs-display-md));
    letter-spacing: var(--uux-ls-display-md);
    line-height: 1.2;
}

h4, .display-sm {
    font-size: clamp(1.2rem, 3vw, var(--uux-fs-display-sm));
    letter-spacing: var(--uux-ls-display-sm);
    line-height: 1.25;
}

p {
    margin: 0 0 1em;
    color: var(--body, #3d3d3a);
}

strong, b {
    font-weight: 600;
    color: var(--ink, #141413);
}

/* 行内强调(高亮下划线效果) */
.highlight-warm {
    background: linear-gradient(transparent 62%, rgba(232, 165, 90, 0.45) 62%);
    padding: 0 2px;
}

/* ============================================
   4. 顶部导航(school 模板风格 · sticky + backdrop)
   ============================================ */

.header-sticky,
.site-header,
.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--uux-header-h);
    display: flex;
    align-items: center;
    background: rgba(250, 249, 245, 0.92);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--hairline, #e6dfd8);
    box-shadow: var(--uux-shadow-sm);
}

.header-inner {
    width: 100%;
    max-width: var(--uux-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.header-logo {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--ink, #141413);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.header-logo:hover {
    color: var(--brand-primary, #cc785c);
    text-decoration: none;
}

.header-logo .icon-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--brand-primary, #cc785c);
    display: inline-block;
    flex-shrink: 0;
}

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

.header-nav a,
.nav-link-pill {
    text-decoration: none;
    color: var(--body, #3d3d3a);
    font-family: var(--uux-font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 7px 13px;
    border-radius: var(--uux-r-pill);
    transition: var(--uux-transition);
    white-space: nowrap;
}

.header-nav a:hover,
.nav-link-pill:hover,
.header-nav a:focus-visible,
.nav-link-pill:focus-visible {
    background: var(--surface-soft, #f5f0e8);
    color: var(--ink, #141413);
    text-decoration: none;
    outline: none;
}

.header-nav a.active,
.nav-link-pill.active {
    background: var(--surface-card, #efe9de);
    color: var(--ink, #141413);
}

/* ============================================
   5. 面包屑(school 模板风格)
   ============================================ */

.breadcrumb {
    max-width: var(--uux-max-width);
    margin: 16px auto 0;
    padding: 0 20px;
    font-size: 0.82rem;
    color: var(--muted, #6c6a64);
    font-family: var(--uux-font-sans);
}

.breadcrumb ol,
.breadcrumb ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin: 0;
    padding: 0;
}

.breadcrumb li {
    display: flex;
    align-items: center;
    gap: 6px;
}

.breadcrumb li + li::before {
    content: '/';
    color: var(--muted-soft, #8e8b82);
    margin: 0 2px;
}

.breadcrumb a {
    color: var(--brand-primary, #cc785c);
    text-decoration: none;
    transition: var(--uux-transition-fast);
}

.breadcrumb a:hover {
    color: var(--brand-primary-active, #a9583e);
    text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
    color: var(--ink, #141413);
    font-weight: 500;
}

/* ============================================
   6. Hero 区(头部标题区 · 居中文案)
   ============================================ */

.hero-section-uux {
    text-align: center;
    padding: clamp(32px, 6vw, 64px) 20px clamp(20px, 4vw, 32px);
    max-width: var(--uux-max-width);
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: var(--surface-soft, #f5f0e8);
    color: var(--brand-primary, #cc785c);
    font-family: var(--uux-font-sans);
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    padding: 6px 16px;
    border-radius: var(--uux-r-pill);
    margin-bottom: 16px;
    text-transform: uppercase;
}

.hero-title-uux {
    font-size: clamp(1.8rem, 5vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.25;
    margin-bottom: 14px;
    color: var(--ink, #141413);
    font-family: var(--uux-font-sans);
}

.hero-title-uux .highlight {
    color: var(--brand-primary, #cc785c);
    background: linear-gradient(135deg, var(--brand-primary, #cc785c) 0%, #e8a55a 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle-uux {
    font-size: clamp(0.95rem, 1.6vw, 1.05rem);
    color: var(--body, #3d3d3a);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.7;
    font-family: var(--uux-font-sans);
}

.hero-subtitle-uux strong {
    color: var(--ink, #141413);
    font-weight: 600;
}

/* ============================================
   7. 章节标题(带序号圆形徽章)
   ============================================ */

.section-header-uux {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    max-width: var(--uux-max-width);
    margin-left: auto;
    margin-right: auto;
    padding: 0 20px;
}

.section-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--ink, #141413);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    padding: 0 8px;
    flex-shrink: 0;
    font-family: var(--uux-font-sans);
}

.section-title-uux {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    font-weight: 700;
    color: var(--ink, #141413);
    letter-spacing: -0.01em;
    font-family: var(--uux-font-sans);
    line-height: 1.3;
}

.section-subtitle-uux {
    font-size: 0.9rem;
    color: var(--muted, #6c6a64);
    font-weight: 400;
    margin-left: 4px;
    font-family: var(--uux-font-sans);
}

/* ============================================
   8. 资源卡片网格(school 模板风格 · 顶部色条)
   ============================================ */

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    max-width: var(--uux-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.resource-card-uux {
    background: var(--canvas, #faf9f5);
    border-radius: var(--uux-r-xl);
    padding: 26px 24px;
    box-shadow: var(--uux-shadow-md);
    border: 1px solid var(--hairline, #e6dfd8);
    transition: var(--uux-transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: relative;
    overflow: hidden;
    font-family: var(--uux-font-sans);
}

.resource-card-uux::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--brand-primary, #cc785c);
}

.resource-card-uux.card-coral::before {
    background: linear-gradient(90deg, var(--brand-primary, #cc785c), #e08341);
}

.resource-card-uux.card-teal::before {
    background: linear-gradient(90deg, var(--accent-teal, #5db8a6), #7dc7b8);
}

.resource-card-uux.card-amber::before {
    background: linear-gradient(90deg, var(--accent-amber, #e8a55a), #d4a943);
}

.resource-card-uux.card-ink::before {
    background: linear-gradient(90deg, var(--ink, #141413), #3d3d3a);
}

.resource-card-uux:hover {
    box-shadow: var(--uux-shadow-lg);
    transform: translateY(-3px);
    border-color: var(--muted-soft, #8e8b82);
}

.resource-card-uux:focus-visible {
    outline: 3px solid var(--brand-primary, #cc785c);
    outline-offset: 2px;
}

.resource-card-uux .resource-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 4px 12px;
    border-radius: var(--uux-r-pill);
    text-transform: uppercase;
    align-self: flex-start;
    background: var(--surface-soft, #f5f0e8);
    color: var(--brand-primary, #cc785c);
}

.resource-card-uux .resource-icon {
    font-size: 2rem;
    line-height: 1;
}

.resource-card-uux h2,
.resource-card-uux h3,
.resource-card-uux .resource-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--ink, #141413);
    letter-spacing: -0.01em;
    line-height: 1.35;
    margin: 0;
    font-family: var(--uux-font-sans);
}

.resource-card-uux .resource-desc {
    color: var(--body, #3d3d3a);
    font-size: 0.9rem;
    line-height: 1.65;
    margin: 0;
}

.resource-card-uux .resource-desc strong {
    color: var(--ink, #141413);
    font-weight: 600;
}

.resource-card-uux .resource-highlights {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 4px 0 0;
}

.resource-card-uux .resource-highlights li {
    font-size: 0.85rem;
    color: var(--body, #3d3d3a);
    padding-left: 20px;
    position: relative;
    line-height: 1.55;
}

.resource-card-uux .resource-highlights li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success, #5db872);
    font-weight: 700;
}

.resource-card-uux .resource-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 6px;
    color: var(--brand-primary, #cc785c);
    font-weight: 600;
    font-size: 0.9rem;
}

.resource-card-uux .resource-cta .arrow {
    transition: transform var(--uux-transition);
    display: inline-block;
}

.resource-card-uux:hover .resource-cta .arrow {
    transform: translateX(4px);
}

/* ============================================
   9. 快速分类网格(小卡片 · icon + 标题 + 描述)
   ============================================ */

.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    max-width: var(--uux-max-width);
    margin: 16px auto 0;
    padding: 0 20px;
}

.quick-item {
    background: var(--canvas, #faf9f5);
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-lg);
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--uux-shadow-sm);
    transition: var(--uux-transition);
    font-family: var(--uux-font-sans);
}

.quick-item:hover {
    box-shadow: var(--uux-shadow-md);
    border-color: var(--muted-soft, #8e8b82);
    transform: translateY(-2px);
}

.quick-item .q-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    line-height: 1;
}

.quick-item .q-content {
    flex: 1;
    min-width: 0;
}

.quick-item .q-title {
    font-weight: 700;
    color: var(--ink, #141413);
    font-size: 0.92rem;
    margin: 0 0 2px;
    line-height: 1.3;
}

.quick-item .q-desc {
    color: var(--muted, #6c6a64);
    font-size: 0.78rem;
    line-height: 1.4;
    margin: 0;
}

/* ============================================
   10. 提示横幅(callout · 暖色)
   ============================================ */

.callout-banner {
    background: linear-gradient(135deg, var(--surface-soft, #f5f0e8), #fff8e6);
    border: 1px solid var(--hairline, #e6dfd8);
    border-left: 4px solid var(--accent-amber, #e8a55a);
    border-radius: var(--uux-r-lg);
    padding: 18px 22px;
    margin: 28px auto;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    color: var(--body-strong, #252523);
    font-size: 0.92rem;
    line-height: 1.65;
    max-width: var(--uux-max-width);
    font-family: var(--uux-font-sans);
}

.callout-banner .b-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    line-height: 1;
}

.callout-banner strong {
    display: block;
    margin-bottom: 4px;
    color: var(--ink, #141413);
    font-weight: 700;
}

.callout-banner.callout-coral {
    background: linear-gradient(135deg, var(--brand-primary, #cc785c), #a9583e);
    color: var(--on-primary, #ffffff);
    border: none;
    border-radius: var(--uux-r-lg);
    padding: 32px;
}

.callout-banner.callout-coral strong {
    color: #fff;
}

.callout-banner.callout-coral a {
    color: #fff;
    text-decoration: underline;
}

/* ============================================
   11. 引用来源列表(目录 + 链接)
   ============================================ */

.source-list {
    background: var(--canvas, #faf9f5);
    border-radius: var(--uux-r-lg);
    border: 1px solid var(--hairline, #e6dfd8);
    padding: 20px 22px;
    box-shadow: var(--uux-shadow-sm);
    max-width: var(--uux-max-width);
    margin: 0 auto;
    font-family: var(--uux-font-sans);
}

.source-list h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--ink, #141413);
    margin: 0 0 12px;
}

.source-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.source-list li {
    font-size: 0.88rem;
    color: var(--body, #3d3d3a);
    line-height: 1.6;
    padding-left: 22px;
    position: relative;
}

.source-list li::before {
    content: '🔗';
    position: absolute;
    left: 0;
    font-size: 0.85rem;
    line-height: 1.6;
}

.source-list a {
    color: var(--brand-primary, #cc785c);
    text-decoration: none;
    word-break: break-all;
    transition: var(--uux-transition-fast);
}

.source-list a:hover {
    color: var(--brand-primary-active, #a9583e);
    text-decoration: underline;
}

/* ============================================
   12. 按钮系统(主/次/文字/图标)
   ============================================ */

.btn-primary-uux,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 40px;
    padding: 0 20px;
    background-color: var(--brand-primary, #cc785c);
    color: var(--on-primary, #ffffff);
    font-family: var(--uux-font-sans);
    font-size: var(--uux-fs-body-sm);
    font-weight: 500;
    line-height: 1;
    border: 1px solid var(--brand-primary, #cc785c);
    border-radius: var(--uux-r-md);
    cursor: pointer;
    text-decoration: none;
    transition: var(--uux-transition);
    white-space: nowrap;
}

.btn-primary-uux:hover,
.btn:hover {
    background-color: var(--brand-primary-active, #a9583e);
    border-color: var(--brand-primary-active, #a9583e);
    color: var(--on-primary, #ffffff);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--uux-shadow-coral);
}

.btn-primary-uux:active,
.btn:active {
    transform: scale(0.98);
}

.btn-secondary-uux {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 40px;
    padding: 0 20px;
    background-color: var(--canvas, #faf9f5);
    color: var(--ink, #141413);
    font-family: var(--uux-font-sans);
    font-size: var(--uux-fs-body-sm);
    font-weight: 500;
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-md);
    cursor: pointer;
    text-decoration: none;
    transition: var(--uux-transition);
    white-space: nowrap;
}

.btn-secondary-uux:hover {
    border-color: var(--ink, #141413);
    background-color: var(--surface-soft, #f5f0e8);
    color: var(--ink, #141413);
    text-decoration: none;
}

.btn-text-uux {
    background: transparent;
    color: var(--brand-primary, #cc785c);
    font-family: var(--uux-font-sans);
    font-size: var(--uux-fs-body-sm);
    font-weight: 500;
    border: none;
    padding: 0;
    cursor: pointer;
    text-decoration: none;
    transition: var(--uux-transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-text-uux:hover {
    color: var(--brand-primary-active, #a9583e);
    text-decoration: underline;
}

.btn-icon-circle-uux {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--canvas, #faf9f5);
    color: var(--ink, #141413);
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-pill);
    cursor: pointer;
    text-decoration: none;
    transition: var(--uux-transition);
    font-size: 14px;
}

.btn-icon-circle-uux:hover {
    border-color: var(--ink, #141413);
    background-color: var(--surface-soft, #f5f0e8);
    color: var(--ink, #141413);
    text-decoration: none;
}

/* ============================================
   13. 徽章 / 标签
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    font-family: var(--uux-font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.4;
    border-radius: var(--uux-r-pill);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.badge.badge-default {
    background: var(--surface-card, #efe9de);
    color: var(--ink, #141413);
}

.badge.badge-coral {
    background: var(--brand-primary, #cc785c);
    color: var(--on-primary, #ffffff);
}

.badge.badge-amber {
    background: var(--accent-amber, #e8a55a);
    color: #ffffff;
}

.badge.badge-teal {
    background: var(--accent-teal, #5db8a6);
    color: #ffffff;
}

.badge.badge-ink {
    background: var(--ink, #141413);
    color: var(--on-dark, #faf9f5);
}

.badge.badge-outline {
    background: transparent;
    color: var(--ink, #141413);
    border: 1px solid var(--hairline, #e6dfd8);
}

/* ============================================
   14. 卡片系统(基础 / 暗色 / 玻璃)
   ============================================ */

.card {
    background: var(--canvas, #faf9f5);
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-lg);
    padding: 24px;
    transition: var(--uux-transition);
    font-family: var(--uux-font-sans);
}

.card-cream {
    background: var(--surface-card, #efe9de);
    border: none;
    border-radius: var(--uux-r-lg);
    padding: 24px;
}

.card-dark {
    background: var(--surface-dark, #181715);
    color: var(--on-dark, #faf9f5);
    border: none;
    border-radius: var(--uux-r-lg);
    padding: 24px;
}

.card-dark h1, .card-dark h2, .card-dark h3, .card-dark h4 {
    color: var(--on-dark, #faf9f5);
}

.card-glass {
    background: rgba(250, 249, 245, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-lg);
    padding: 24px;
}

.card-hover:hover {
    box-shadow: var(--uux-shadow-md);
    transform: translateY(-2px);
    border-color: var(--muted-soft, #8e8b82);
}

/* ============================================
   15. 引用 / 提示块
   ============================================ */

.quote-block {
    background: var(--surface-soft, #f5f0e8);
    border-left: 3px solid var(--brand-primary, #cc785c);
    padding: 20px 24px;
    border-radius: 0 var(--uux-r-md) var(--uux-r-md) 0;
    font-family: var(--uux-font-display);
    font-size: 1.1rem;
    font-weight: 400;
    line-height: 1.7;
    color: var(--body-strong, #252523);
    margin: 24px 0;
}

.quote-block cite {
    display: block;
    margin-top: 8px;
    font-family: var(--uux-font-sans);
    font-size: 0.85rem;
    font-style: normal;
    color: var(--muted, #6c6a64);
}

/* ============================================
   16. 进度条(顶部阅读进度 · 4px 珊瑚)
   ============================================ */

.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: linear-gradient(90deg, var(--brand-primary, #cc785c), var(--brand-primary-active, #a9583e));
    z-index: 1000;
    transition: width 0.1s linear;
    pointer-events: none;
}

/* ============================================
   17. Footer(school 模板风格 · 居中简洁)
   ============================================ */

.footer-uux {
    text-align: center;
    padding: 32px 20px;
    color: var(--muted, #6c6a64);
    font-family: var(--uux-font-sans);
    font-size: 0.85rem;
    border-top: 1px solid var(--hairline, #e6dfd8);
    margin-top: 60px;
    max-width: var(--uux-max-width);
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.footer-uux a {
    color: var(--brand-primary, #cc785c);
    text-decoration: none;
    transition: var(--uux-transition-fast);
}

.footer-uux a:hover {
    color: var(--brand-primary-active, #a9583e);
    text-decoration: underline;
}

.footer-dark {
    background: var(--surface-dark, #181715);
    color: var(--on-dark-soft, #a09d96);
    padding: 48px 24px;
    margin-top: 60px;
    font-family: var(--uux-font-sans);
    font-size: 0.88rem;
    line-height: 1.6;
}

.footer-dark a {
    color: var(--on-dark, #faf9f5);
    text-decoration: none;
}

.footer-dark a:hover {
    color: var(--brand-primary, #cc785c);
}

/* ============================================
   18. 可访问性 · 焦点态
   ============================================ */

*:focus-visible {
    outline: 2px solid var(--brand-primary, #cc785c);
    outline-offset: 2px;
    border-radius: var(--uux-r-md);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--brand-primary, #cc785c);
    outline-offset: 2px;
}

/* 跳过导航(skip link) */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 8px;
    z-index: 9999;
    background: var(--brand-primary, #cc785c);
    color: #fff;
    padding: 10px 20px;
    border-radius: var(--uux-r-md);
    text-decoration: none;
    font-weight: 600;
    transition: top 0.2s var(--uux-ease);
}

.skip-to-content:focus {
    top: 8px;
    color: #fff;
    text-decoration: none;
}

/* ============================================
   19. 图片优化
   ============================================ */

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

img.lazy {
    opacity: 0;
    transition: opacity 0.4s var(--uux-ease);
}

img.lazy.loaded {
    opacity: 1;
}

/* ============================================
   20. 表单元素(输入框 / 文本域 / 选择)
   ============================================ */

input[type="text"],
input[type="email"],
input[type="search"],
input[type="url"],
input[type="password"],
input[type="number"],
textarea,
select {
    width: 100%;
    height: 40px;
    padding: 0 14px;
    background-color: var(--canvas, #faf9f5);
    color: var(--ink, #141413);
    font-family: var(--uux-font-sans);
    font-size: var(--uux-fs-body-md);
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-md);
    outline: none;
    transition: var(--uux-transition);
    box-sizing: border-box;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="search"]:focus,
input[type="url"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    border-color: var(--brand-primary, #cc785c);
    box-shadow: 0 0 0 3px rgba(204, 120, 92, 0.15);
}

textarea {
    height: auto;
    min-height: 96px;
    padding: 10px 14px;
    line-height: 1.5;
    resize: vertical;
}

label {
    display: block;
    font-family: var(--uux-font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink, #141413);
    margin-bottom: 6px;
}

/* ============================================
   21. 表格(基础 + 暗色产品卡)
   ============================================ */

.table-uux {
    width: 100%;
    background: var(--canvas, #faf9f5);
    border-collapse: separate;
    border-spacing: 0;
    border: 1px solid var(--hairline, #e6dfd8);
    border-radius: var(--uux-r-lg);
    overflow: hidden;
    font-family: var(--uux-font-sans);
    font-size: 0.9rem;
}

.table-uux th,
.table-uux td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--hairline, #e6dfd8);
}

.table-uux th {
    background: var(--surface-soft, #f5f0e8);
    font-weight: 600;
    color: var(--ink, #141413);
}

.table-uux tr:last-child td {
    border-bottom: none;
}

.table-uux tbody tr:hover {
    background: var(--surface-soft, #f5f0e8);
}

.table-dark-uux {
    width: 100%;
    background: var(--surface-dark, #181715);
    color: var(--on-dark, #faf9f5);
    border-collapse: separate;
    border-spacing: 0;
    border-radius: var(--uux-r-lg);
    overflow: hidden;
    font-family: var(--uux-font-sans);
    font-size: 0.9rem;
}

.table-dark-uux th,
.table-dark-uux td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--surface-dark-soft, #1f1e1b);
}

.table-dark-uux th {
    background: var(--surface-dark-elevated, #252320);
    color: var(--on-dark, #faf9f5);
    font-weight: 600;
}

.table-dark-uux tr:last-child td {
    border-bottom: none;
}

/* ============================================
   22. 列表(ul / ol · 优化样式)
   ============================================ */

ul, ol {
    margin: 0 0 1em;
    padding-left: 1.5em;
    color: var(--body, #3d3d3a);
}

li {
    margin-bottom: 0.35em;
    line-height: 1.7;
}

ul.list-clean {
    list-style: none;
    padding-left: 0;
}

/* 列表项前自定义圆点 */
ul.list-dot {
    list-style: none;
    padding-left: 0;
}

ul.list-dot > li {
    padding-left: 1.5em;
    position: relative;
}

ul.list-dot > li::before {
    content: '•';
    position: absolute;
    left: 0.4em;
    color: var(--brand-primary, #cc785c);
    font-weight: 700;
    font-size: 1.2em;
    line-height: 1.5;
}

/* ============================================
   23. 代码块
   ============================================ */

code {
    font-family: var(--uux-font-mono);
    font-size: 0.9em;
    background: var(--surface-soft, #f5f0e8);
    color: var(--brand-primary-active, #a9583e);
    padding: 2px 6px;
    border-radius: 4px;
}

pre {
    background: var(--surface-dark, #181715);
    color: var(--on-dark, #faf9f5);
    padding: 16px 20px;
    border-radius: var(--uux-r-lg);
    overflow-x: auto;
    font-family: var(--uux-font-mono);
    font-size: 0.88rem;
    line-height: 1.6;
    margin: 1em 0;
}

pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

/* ============================================
   24. 容器(布局)
   ============================================ */

.container-uux {
    max-width: var(--uux-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.container-narrow {
    max-width: var(--uux-max-width-narrow);
    margin: 0 auto;
    padding: 0 20px;
}

.section-uux {
    padding: 48px 0;
}

@media (min-width: 640px) {
    .container-uux,
    .container-narrow {
        padding: 0 32px;
    }
}

@media (min-width: 1024px) {
    .container-uux,
    .container-narrow {
        padding: 0 48px;
    }
}

@media (max-width: 640px) {
    .container-uux,
    .container-narrow {
        padding: 0 16px;
    }
    .section-uux {
        padding: 32px 0;
    }
}

/* ============================================
   25. 响应式断点
   ============================================ */

@media (max-width: 768px) {
    .header-sticky,
    .site-header,
    .top-nav {
        height: auto;
        min-height: 52px;
        padding: 8px 0;
    }

    .header-inner {
        flex-wrap: wrap;
        padding: 8px 14px;
    }

    .header-logo {
        font-size: 0.9rem;
    }

    .header-nav a,
    .nav-link-pill {
        font-size: 0.78rem;
        padding: 6px 10px;
    }

    .hero-section-uux {
        padding: 24px 12px 18px;
    }

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

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

    .section-header-uux {
        padding: 0 12px;
    }

    .breadcrumb {
        padding: 0 12px;
        margin: 8px auto 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

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

    .resource-card-uux,
    .card,
    .card-cream,
    .card-dark,
    .card-glass {
        padding: 18px 16px;
    }

    .callout-banner {
        padding: 14px 16px;
        flex-direction: column;
        gap: 8px;
    }
}

@media (min-width: 1400px) {
    .hero-title-uux {
        font-size: 2.8rem;
    }
}

/* ============================================
   26. 暗色模式(可选 · 跟随系统)
   ============================================ */

@media (prefers-color-scheme: dark) {
    :root {
        --uux-canvas: #1a1816;
        --uux-canvas-card: #252320;
    }
    /* 注:不在此强制覆盖 brand 色与组件,以保护每个页面的主题色。
       如需全面暗色支持,后续可在子页面单独定义 :root 暗色变量。 */
}

/* ============================================
   27. 动效偏好(reduced-motion)
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================
   28. 工具类
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-ink { color: var(--ink, #141413); }
.text-body { color: var(--body, #3d3d3a); }
.text-muted { color: var(--muted, #6c6a64); }
.text-coral { color: var(--brand-primary, #cc785c); }
.bg-canvas { background-color: var(--canvas, #faf9f5); }
.bg-cream { background-color: var(--surface-card, #efe9de); }
.bg-dark { background-color: var(--surface-dark, #181715); color: var(--on-dark, #faf9f5); }
.rounded-sm { border-radius: var(--uux-r-md); }
.rounded-md { border-radius: var(--uux-r-lg); }
.rounded-lg { border-radius: var(--uux-r-xl); }
.rounded-pill { border-radius: var(--uux-r-pill); }
.shadow-sm { box-shadow: var(--uux-shadow-sm); }
.shadow-md { box-shadow: var(--uux-shadow-md); }
.shadow-lg { box-shadow: var(--uux-shadow-lg); }
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

@media (max-width: 640px) {
    .hide-mobile { display: none !important; }
}

@media (min-width: 769px) {
    .hide-desktop { display: none !important; }
}

/* ============================================
   29. 动画(轻量 · 仅关键场景)
   ============================================ */

@keyframes uux-fade-in-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.uux-fade-in {
    animation: uux-fade-in-up 0.5s var(--uux-ease) backwards;
}

.uux-hover-lift {
    transition: var(--uux-transition);
}

.uux-hover-lift:hover {
    transform: translateY(-2px);
}

/* 章节交错动画 */
.uux-stagger > *:nth-child(1) { animation-delay: 0ms; }
.uux-stagger > *:nth-child(2) { animation-delay: 60ms; }
.uux-stagger > *:nth-child(3) { animation-delay: 120ms; }
.uux-stagger > *:nth-child(4) { animation-delay: 180ms; }
.uux-stagger > *:nth-child(5) { animation-delay: 240ms; }
.uux-stagger > *:nth-child(6) { animation-delay: 300ms; }
.uux-stagger > *:nth-child(7) { animation-delay: 360ms; }
.uux-stagger > *:nth-child(8) { animation-delay: 420ms; }
.uux-stagger > *:nth-child(9) { animation-delay: 480ms; }

/* ============================================
   30. 打印样式(可访问性)
   ============================================ */

@media print {
    .header-sticky,
    .site-header,
    .top-nav,
    .breadcrumb,
    .footer-uux,
    .footer-dark,
    .floating-actions,
    .fab,
    .reading-progress-bar {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    a {
        color: #000;
        text-decoration: underline;
    }

    .resource-card-uux,
    .card,
    .card-cream {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* =================================================================
 * 结束 · ui-ux-max.css v1.0.0
 * ================================================================= */