/* ============================================
   黄色仓库创意设计素材与模板下载平台 - 主样式表
   色彩方案：明黄+黑 经典撞色
   布局：素材库网格式布局，筛选侧栏+预览网格
   ============================================ */

/* === CSS 设计令牌（Design Tokens） === */
:root {
    --primary: #FFC107;
    --secondary: #FF8F00;
    --bg: #212121;
    --card-bg: #2C2C2C;
    --accent: #FFEB3B;
    --text: #FFFFFF;
    --text-muted: #B0B0B0;
    --border: #3D3D3D;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 40px rgba(255, 193, 7, 0.15);
    --transition: all 0.3s ease;
    --font-heading: 'Montserrat', 'Poppins', sans-serif;
    --font-body: 'Inter', 'Roboto', sans-serif;
    --font-code: 'Fira Code', monospace;
    --max-width: 1440px;
    --nav-height: 72px;
}

/* === 全局重置 === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.5em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1em;
    color: var(--text-muted);
}

/* === 工具类 === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    color: var(--text);
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

.section-title p {
    margin-top: 16px;
    font-size: 1.1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #000;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(255, 193, 7, 0.4);
    color: #000;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #000;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255, 193, 7, 0.15);
    color: var(--accent);
}

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(33, 33, 33, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.navbar-brand img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.navbar-brand span {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
}

.navbar-search {
    flex: 1;
    max-width: 520px;
    margin: 0 32px;
    position: relative;
}

.navbar-search input {
    width: 100%;
    padding: 10px 44px 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.9rem;
    transition: var(--transition);
}

.navbar-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
}

.navbar-search button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 1.1rem;
}

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

.navbar-nav a {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--card-bg);
    color: var(--text-muted);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.nav-icon:hover {
    background: var(--primary);
    color: #000;
}

.nav-icon .count {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 18px;
    height: 18px;
    background: var(--secondary);
    border-radius: 50%;
    font-size: 0.65rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

/* === Hero Section === */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-top: var(--nav-height);
    padding: 60px 24px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(33,33,33,0.3) 0%, rgba(33,33,33,0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.hero-search {
    max-width: 600px;
    margin: 0 auto 24px;
    position: relative;
}

.hero-search input {
    width: 100%;
    padding: 16px 60px 16px 24px;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 50px;
    color: var(--text);
    font-size: 1rem;
    transition: var(--transition);
}

.hero-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 193, 7, 0.15);
}

.hero-search button {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    color: #000;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.hero-search button:hover {
    transform: translateY(-50%) scale(1.05);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.hero-tags a {
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: var(--transition);
}

.hero-tags a:hover {
    background: var(--primary);
    color: #000;
}

/* === 分类导航金刚区 === */
.category-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 24px;
}

.category-card {
    text-align: center;
    padding: 32px 16px;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.category-card img {
    width: 64px;
    height: 64px;
    margin: 0 auto 12px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.category-card h4 {
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 4px;
}

.category-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

/* === 素材卡片网格 === */
.assets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.asset-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.asset-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.asset-card-image {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
}

.asset-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.asset-card:hover .asset-card-image img {
    transform: scale(1.05);
}

.asset-card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    opacity: 0;
    transition: var(--transition);
}

.asset-card:hover .asset-card-overlay {
    opacity: 1;
}

.asset-card-overlay button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    color: #000;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.asset-card-overlay button:hover {
    transform: scale(1.1);
}

.asset-card-info {
    padding: 16px;
}

.asset-card-info h4 {
    font-size: 0.95rem;
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.asset-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.asset-card-author {
    display: flex;
    align-items: center;
    gap: 8px;
}

.asset-card-author img {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    object-fit: cover;
}

.asset-card-author span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.asset-card-stats {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.asset-card-price {
    margin-top: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.price-tag {
    font-weight: 700;
    color: var(--primary);
    font-size: 1.1rem;
}

.price-tag.free {
    color: #4CAF50;
}

/* === 瀑布流布局 === */
.masonry-grid {
    columns: 4;
    column-gap: 24px;
}

.masonry-item {
    break-inside: avoid;
    margin-bottom: 24px;
}

/* === 侧边栏筛选器 === */
.page-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    margin-top: var(--nav-height);
    padding-top: 32px;
}

.sidebar {
    position: sticky;
    top: calc(var(--nav-height) + 32px);
    height: fit-content;
    max-height: calc(100vh - var(--nav-height) - 64px);
    overflow-y: auto;
}

.filter-group {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
}

.filter-group h4 {
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.filter-group h4 .toggle {
    cursor: pointer;
    color: var(--text-muted);
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.filter-option:hover {
    background: rgba(255, 193, 7, 0.08);
}

.filter-option input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-option input[type="checkbox"]:checked {
    background: var(--primary);
    border-color: var(--primary);
}

.filter-option label {
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
}

.filter-option .count {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* === 创作者卡片 === */
.creator-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.creator-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.creator-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    border: 3px solid var(--primary);
}

.creator-card h4 {
    margin-bottom: 4px;
}

.creator-card p {
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.creator-works {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.creator-works img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: none;
}

/* === 周免费素材 === */
.freebies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.freebie-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 2px solid var(--accent);
    position: relative;
}

.freebie-card .badge-free {
    position: absolute;
    top: 12px;
    left: 12px;
    background: #4CAF50;
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    z-index: 2;
}

.countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: rgba(255, 235, 59, 0.1);
    font-size: 0.85rem;
    color: var(--accent);
}

.countdown span {
    font-weight: 700;
    font-family: var(--font-code);
}

/* === 设计趋势博客 === */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.blog-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.blog-card-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-card-content {
    padding: 20px;
}

.blog-card-content .badge {
    margin-bottom: 12px;
}

.blog-card-content h4 {
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.blog-card-content p {
    font-size: 0.85rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* === 平台优势 === */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.advantage-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.advantage-card .icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.advantage-card h4 {
    margin-bottom: 8px;
    font-size: 1rem;
}

.advantage-card p {
    font-size: 0.85rem;
}

/* 合作企业Logo墙 */
.partners-wall {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
    padding: 32px;
    opacity: 0.5;
    transition: var(--transition);
}

.partners-wall:hover {
    opacity: 1;
}

.partners-wall span {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-muted);
    font-family: var(--font-heading);
}

/* === 超级页脚 === */
.footer {
    background: #1a1a1a;
    border-top: 1px solid var(--border);
    padding: 64px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr) 1.5fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand p {
    font-size: 0.85rem;
    margin-top: 12px;
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: #000;
}

.footer-col h4 {
    font-size: 0.95rem;
    margin-bottom: 16px;
    color: var(--text);
}

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

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

.footer-col ul li a {
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.footer-newsletter input {
    width: 100%;
    padding: 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.footer-newsletter button {
    width: 100%;
    padding: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: var(--radius-sm);
    color: #000;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.footer-newsletter button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.3);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-links a {
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

/* === 面包屑导航 === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 0;
    font-size: 0.85rem;
}

.breadcrumb a {
    color: var(--text-muted);
}

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

.breadcrumb span {
    color: var(--text-muted);
}

.breadcrumb .current {
    color: var(--text);
}

/* === Tab切换 === */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0;
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
    color: var(--primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

/* === 授权选择器 === */
.license-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.license-card {
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    cursor: pointer;
    transition: var(--transition);
}

.license-card.active,
.license-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.license-card h4 {
    margin-bottom: 8px;
}

.license-card .price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.license-card ul {
    list-style: none;
}

.license-card ul li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.license-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* === 排行榜 === */
.leaderboard {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.leaderboard-item:hover {
    background: rgba(255, 193, 7, 0.05);
}

.leaderboard-rank {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
}

.leaderboard-rank.top {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #000;
}

.leaderboard-item img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
}

.leaderboard-info {
    flex: 1;
}

.leaderboard-info h5 {
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.leaderboard-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* === 骨架屏加载 === */
.skeleton {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
}

.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
    animation: skeleton-shimmer 1.5s infinite;
}

@keyframes skeleton-shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* === 404页面 === */
.error-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px;
}

.error-page h1 {
    font-size: 8rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

/* === 表单样式 === */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* === 对比表格 === */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 14px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

.comparison-table th {
    background: rgba(255, 193, 7, 0.1);
    color: var(--primary);
    font-weight: 600;
}

.comparison-table tr:hover {
    background: rgba(255, 193, 7, 0.03);
}

/* === 响应式设计 (Mobile First) === */
@media (max-width: 1024px) {
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .masonry-grid {
        columns: 3;
    }
    
    .page-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
        max-height: none;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.5rem; }
    
    .navbar-search {
        display: none;
    }
    
    .navbar-nav {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .assets-grid {
        grid-template-columns: 1fr;
    }
    
    .masonry-grid {
        columns: 2;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: 48px 0;
    }
    
    .hero {
        min-height: 60vh;
    }
}

@media (max-width: 480px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .masonry-grid {
        columns: 1;
    }
    
    .hero-content h1 {
        font-size: 1.6rem;
    }
}

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

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* === 打字机效果 === */
.typewriter {
    overflow: hidden;
    white-space: nowrap;
    border-right: 2px solid var(--primary);
    animation: typing 3.5s steps(30) infinite, blink 0.75s step-end infinite;
}

@keyframes typing {
    0%, 100% { width: 0; }
    50%, 80% { width: 100%; }
}

@keyframes blink {
    50% { border-color: transparent; }
}

/* === 批量下载购物车浮窗 === */
.download-cart {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 999;
}

.download-cart-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    color: #000;
    font-size: 1.3rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(255, 193, 7, 0.4);
    transition: var(--transition);
    position: relative;
}

.download-cart-btn:hover {
    transform: scale(1.1);
}

.download-cart-btn .cart-count {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 22px;
    height: 22px;
    background: #f44336;
    border-radius: 50%;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
}

/* === 收藏按钮动画 === */
.favorite-btn {
    transition: var(--transition);
}

.favorite-btn.active {
    animation: heartBounce 0.4s ease;
    color: #f44336;
}

@keyframes heartBounce {
    0% { transform: scale(1); }
    30% { transform: scale(1.3); }
    60% { transform: scale(0.9); }
    100% { transform: scale(1); }
}