```css
/* ==========================================================================
   17C.COM一起草入口 - 高效文档创作工具入口
   完整样式表 - 响应式 / 暗色模式 / 毛玻璃 / 滚动动画
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS 变量与全局重置
   -------------------------------------------------------------------------- */
:root {
    --primary: #1e3a5f;
    --primary-light: #2b5a8c;
    --primary-dark: #142a45;
    --accent: #e8a838;
    --accent-light: #f0c060;
    --bg: #f8f9fc;
    --bg-alt: #eef2f8;
    --card-bg: #ffffff;
    --card-glass: rgba(255, 255, 255, 0.72);
    --text: #1e2a3a;
    --text-light: #5a6b7e;
    --text-muted: #8a99ab;
    --border: #dce3ec;
    --border-light: rgba(220, 227, 236, 0.6);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.14);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.6s ease;
    --banner-gradient: linear-gradient(135deg, #1e3a5f 0%, #2b5a8c 50%, #3a6fa8 100%);
    --accent-gradient: linear-gradient(135deg, #e8a838 0%, #f0c060 100%);
    --glass-blur: 16px;
}

[data-theme="dark"] {
    --primary: #4a8fd4;
    --primary-light: #6aa8e8;
    --primary-dark: #2a5a8a;
    --accent: #f0b84a;
    --accent-light: #f8d078;
    --bg: #0f1722;
    --bg-alt: #131d2b;
    --card-bg: #1a2533;
    --card-glass: rgba(26, 37, 51, 0.75);
    --text: #e8edf5;
    --text-light: #9aabbf;
    --text-muted: #6a7a8e;
    --border: #2a3a4e;
    --border-light: rgba(42, 58, 78, 0.6);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --banner-gradient: linear-gradient(135deg, #0f1722 0%, #1a2d45 50%, #1e3a5f 100%);
    --accent-gradient: linear-gradient(135deg, #f0b84a 0%, #f8d078 100%);
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    font-size: 16px;
    transition: background var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-light);
}

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input {
    font-family: inherit;
}

::selection {
    background: var(--primary);
    color: #fff;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* --------------------------------------------------------------------------
   2. 通用容器
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --------------------------------------------------------------------------
   3. 信息栏
   -------------------------------------------------------------------------- */
.info-bar {
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
    font-size: 0.8rem;
    color: var(--text-light);
    transition: background var(--transition-base);
}

.info-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.info-bar span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* --------------------------------------------------------------------------
   4. 吸顶导航栏 (毛玻璃)
   -------------------------------------------------------------------------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--card-glass);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    transition: box-shadow var(--transition-base), background var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 16px;
}

.logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    transition: transform var(--transition-fast);
    letter-spacing: -0.02em;
}

.logo:hover {
    transform: scale(1.02);
    color: var(--primary);
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    position: relative;
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.92rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    white-space: nowrap;
    padding: 4px 0;
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: 4px 12px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.08);
}

[data-theme="dark"] .search-box:focus-within {
    box-shadow: 0 0 0 3px rgba(74, 143, 212, 0.15);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    color: var(--text);
    font-size: 0.85rem;
    width: 120px;
    padding: 4px 0;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    font-size: 1rem;
    padding: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.theme-toggle {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text);
    transition: background var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--border);
    transform: rotate(20deg) scale(1.05);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.mobile-menu-btn:hover {
    background: var(--bg);
}

/* --------------------------------------------------------------------------
   5. 移动菜单
   -------------------------------------------------------------------------- */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--card-glass);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-md);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-menu.open {
    display: flex;
}

.mobile-menu a {
    text-decoration: none;
    color: var(--text);
    padding: 12px 8px;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-menu a:hover {
    color: var(--primary);
    padding-left: 16px;
}

.mobile-menu a:last-child {
    border-bottom: none;
}

/* --------------------------------------------------------------------------
   6. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    text-decoration: underline;
    color: var(--primary-light);
}

.breadcrumb span {
    margin: 0 6px;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   7. Banner 轮播 (渐变 + 毛玻璃)
   -------------------------------------------------------------------------- */
.banner {
    position: relative;
    overflow: hidden;
    background: var(--banner-gradient);
    color: #fff;
    padding: 72px 0 64px;
    isolation: isolate;
}

.banner::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(232, 168, 56, 0.18) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
}

.banner::after {
    content: "";
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
}

.banner-slide {
    display: none;
    animation: fadeInUp 0.7s ease;
}

.banner-slide.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.banner h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.banner p {
    font-size: 1.1rem;
    opacity: 0.92;
    max-width: 640px;
    margin-bottom: 28px;
    line-height: 1.8;
}

.banner-btn {
    display: inline-block;
    background: var(--accent-gradient);
    color: #1e2a3a;
    padding: 12px 32px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 16px rgba(232, 168, 56, 0.3);
}

.banner-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 28px rgba(232, 168, 56, 0.45);
    color: #1e2a3a;
}

.banner-btn:active {
    transform: translateY(-1px);
}

.banner-dots {
    display: flex;
    gap: 8px;
    margin-top: 28px;
}

.banner-dots span {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: background var(--transition-base), width var(--transition-base);
}

.banner-dots span:hover {
    background: rgba(255, 255, 255, 0.7);
}

.banner-dots span.active {
    background: #fff;
    width: 28px;
    border-radius: 5px;
}

/* --------------------------------------------------------------------------
   8. 数字统计
   -------------------------------------------------------------------------- */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 40px 0;
}

.stat-item {
    text-align: center;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* --------------------------------------------------------------------------
   9. 通用区块
   -------------------------------------------------------------------------- */
.section {
    padding: 56px 0;
}

.section-title {
    font-size: 1.7rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.section-sub {
    color: var(--text-light);
    margin-bottom: 36px;
    font-size: 1rem;
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   10. 卡片网格
   -------------------------------------------------------------------------- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-light);
}

.card:hover::before {
    transform: scaleX(1);
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
    line-height: 1.4;
}

.card p {
    color: var(--text-light);
    font-size: 0.92rem;
    line-height: 1.75;
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: var(--banner-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 1.4rem;
    color: #fff;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: 0 4px 12px rgba(30, 58, 95, 0.2);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(-4deg);
    box-shadow: 0 6px 20px rgba(30, 58, 95, 0.3);
}

/* --------------------------------------------------------------------------
   11. 文章列表
   -------------------------------------------------------------------------- */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.article-thumb {
    width: 100%;
    height: 160px;
    background: var(--banner-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 2.4rem;
    font-weight: 800;
    opacity: 0.95;
    transition: transform var(--transition-slow), opacity var(--transition-base);
    position: relative;
    overflow: hidden;
}

.article-thumb::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(0, 0, 0, 0.15) 100%);
}

.article-card:hover .article-thumb {
    transform: scale(1.05);
    opacity: 1;
}

.article-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.article-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
    line-height: 1.5;
    transition: color var(--transition-fast);
}

.article-card:hover .article-body h3 {
    color: var(--primary);
}

.article-body p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 14px;
    flex: 1;
}

.article-link {
    font-size: 0.85rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition-fast), color var(--transition-fast);
    align-self: flex-start;
}

.article-link:hover {
    text-decoration: underline;
    gap: 8px;
    color: var(--primary-light);
}

/* --------------------------------------------------------------------------
   12. FAQ 手风琴
   -------------------------------------------------------------------------- */
.faq-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-item.open {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.faq-question {
    padding: 18px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-size: 0.95rem;
    color: var(--text);
    transition: background var(--transition-fast), color var(--transition-fast);
    user-select: none;
}

.faq-question:hover {
    background: var(--bg);
    color: var(--primary);
}

.faq-question::after {
    content: "+";
    font-size: 1.4rem;
    color: var(--primary);
    transition: transform var(--transition-base);
    flex-shrink: 0;
    line-height: 1;
    font-weight: 400;
}

.faq-item.open .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 24px;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.8;
}

.faq-item.open .faq-answer {
    max-height: 600px;
    padding: 0 24px 20px;
}

/* --------------------------------------------------------------------------
   13. HowTo 步骤
   -------------------------------------------------------------------------- */
.howto-steps {
    counter-reset: step;
}

.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    align-items: flex-start;
    padding: 16px;
    border-radius: var(--radius);
    transition: background var(--transition-fast);
}

.howto-step:hover {
    background: var(--card-bg);
}

.howto-step-num {
    counter-increment: step;
    min-width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--banner-gradient);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(30, 58, 95, 0.2);
    transition: transform var(--transition-base);
}

.howto-step:hover .howto-step-num {
    transform: scale(1.1);
}

.howto-step-content h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

.howto-step-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.75;
}

/* --------------------------------------------------------------------------
   14. 页脚
   -------------------------------------------------------------------------- */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
    margin-top: 40px;
    transition: background var(--transition-base);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text);
    position: relative;
    padding-bottom: 8px;
}

.footer-col h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 8px;
}

.footer-col a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
    display: inline-block;
}

.footer-col a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 20px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* --------------------------------------------------------------------------
   15. 返回顶部
   -------------------------------------------------------------------------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--banner-gradient);
    color: #fff;
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    z-index: 999;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-base);
    opacity: 0;
}

.back-to-top.show {
    display: flex;
    animation: fadeIn 0.3s ease forwards;
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* --------------------------------------------------------------------------
   16. 滚动动画
   -------------------------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   17. SEO 隐藏内容
   -------------------------------------------------------------------------- */
.seo-article-content {
    display: none;
}

/* --------------------------------------------------------------------------
   18. 团队卡片
   -------------------------------------------------------------------------- */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.team-card {
    text-align: center;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.team-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.team-avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: #fff;
    font-weight: 700;
    transition: transform var(--transition-base);
    box-shadow: 0 4px 16px rgba(30, 58, 95, 0.2);
}

.team-card:hover .team-avatar {
    transform: scale(1.08) rotate(4deg);
}

.team-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text);
}

.team-card p {
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   19. 联系方式
   -------------------------------------------------------------------------- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.contact-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.contact-item h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.contact-item p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.75;
    word-break: break-word;
}

/* --------------------------------------------------------------------------
   20. 图片懒加载占位
   -------------------------------------------------------------------------- */
svg.lazy-svg {
    width: 100%;
    height: auto;
    display: block;
}

/* --------------------------------------------------------------------------
   21. 客户评价
   -------------------------------------------------------------------------- */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.testimonial-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px 24px 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.8;
    position: relative;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.testimonial-card::before {
    content: "\201C";
    font-size: 2.4rem;
    color: var(--accent);
    position: absolute;
    top: 8px;
    left: 20px;
    opacity: 0.6;
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-author {
    margin-top: 16px;
    font-weight: 600;
    color: var(--text);
    font-size: 0.85rem;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   22. 新闻列表
   -------------------------------------------------------------------------- */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.news-item {
    display: flex;
    gap: 16px;
    padding: 18px 24px;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    align-items: flex-start;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.news-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.news-date {
    font-size: 0.8rem;
    color: var(--text-light);
    min-width: 90px;
    flex-shrink: 0;
    font-weight: 500;
    padding-top: 2px;
}

.news-content h3 {
    font-size: 0.98rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text);
    line-height: 1.5;
    transition: color var(--transition-fast);
}

.news-item:hover .news-content h3 {
    color: var(--primary);
}

.news-content p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   23. 解决方案
   -------------------------------------------------------------------------- */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.solution-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    border-top: 3px solid var(--primary);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-top-color var(--transition-base);
}

.solution-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-top-color: var(--accent);
}

.solution-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.solution-card p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.75;
}

/* --------------------------------------------------------------------------
   24. 网站地图锚点
   -------------------------------------------------------------------------- */
.sitemap-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.sitemap-links a {
    font-size: 0.82rem;
    color: var(--text-light);
    text-decoration: none;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    background: var(--card-bg);
}

.sitemap-links a:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* --------------------------------------------------------------------------
   25. 响应式布局
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .nav-links {
        gap: 16px;
    }

    .nav-links a {
        font-size: 0.85rem;
    }

    .search-box input {
        width: 90px;
    }
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .search-box {
        display: none;
    }

    .banner h1 {
        font-size: 1.7rem;
    }

    .banner p {
        font-size: 1rem;
    }

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

    .section-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .info-bar .container {
        justify-content: center;
        text-align: center;
    }

    .info-bar span {
        font-size: 0.75rem;
    }

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

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

    .news-item {
        flex-direction: column;
        gap: 8px;
    }

    .news-date {
        min-width: auto;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (max-width: 600px) {
    body {
        font-size: 15px;
    }

    .container {
        padding: 0 16px;
    }

    .banner {
        padding: 48px 0 40px;
    }

    .banner h1 {
        font-size: 1.35rem;
    }

    .banner p {
        font-size: 0.95rem;
        margin-bottom: 20px;
    }

    .banner-btn {
        padding: 10px 24px;
        font-size: 0.92rem;
    }

    .section {
        padding: 36px 0;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .section-sub {
        font-size: 0.9rem;
        margin-bottom: 24px;
    }

    .stats {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        padding: 24px 0;
    }

    .stat-item {
        padding: 20px 12px;
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .stat-label {
        font-size: 0.78rem;
    }

    .card {
        padding: 20px;
    }

    .card-icon {
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }

    .faq-question {
        padding: 14px 18px;
        font-size: 0.9rem;
    }

    .faq-answer {
        padding: 0 18px;
        font-size: 0.85rem;
    }

    .faq-item.open .faq-answer {
        padding: 0 18px 16px;
    }

    .howto-step {
        gap: 14px;
        padding: 10px 8px;
    }

    .howto-step-num {
        min-width: 34px;
        height: 34px;
        font-size: 0.9rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .footer {
        padding: 36px 0 20px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .team-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

    .team-card {
        padding: 20px 12px;
    }

    .team-avatar {
        width: 56px;
        height: 56px;
        font-size: 1.2rem;
    }

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

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

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

@media (max-width: 400px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }

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

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

    .banner h1 {
        font-size: 1.2rem;
    }
}

/* --------------------------------------------------------------------------
   26. 无障碍与减弱动画
   -------------------------------------------------------------------------- */
@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;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* 键盘焦点样式 */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

/* --------------------------------------------------------------------------
   27. 打印样式
   -------------------------------------------------------------------------- */
@media print {
    .navbar,
    .mobile-menu,
    .back-to-top,
    .banner-dots,
    .info-bar {
        display: none !important;
    }

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

    .section {
        padding: 20px 0;
    }

    .card,
    .article-card,
    .faq-item {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
}
```