/**
 * 网盘资源搜索系统 - 首页样式
 * Requirements: 13.1-13.11, 15.1-15.10
 * 冷色调设计 + 响应式布局
 */

/* ========================================
   Header - 头部导航
   ======================================== */
.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: var(--bg-base);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

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

.logo-icon {
    font-size: 24px;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    position: relative;
    padding: var(--spacing-sm) 0;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 1px;
}

/* User Area */
.user-area {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-avatar-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 16px;
    background-color: var(--gray-4);
    border-radius: 50%;
}

.user-dropdown .dropdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 32px;
    height: 32px;
    padding: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

/* ========================================
   Hero Section - 搜索区域
   ======================================== */
.hero-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, #e6f7ff 0%, #f0f5ff 50%, #e6fffb 100%);
    min-height: 400px;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Search Box - 搜索框组件
   ======================================== */
.search-box-wrapper {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
}

.search-box {
    display: flex;
    align-items: stretch;
    background-color: var(--bg-base);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.search-box:focus-within {
    box-shadow: 0 0 0 4px rgba(24, 144, 255, 0.15), var(--shadow-md);
}

.search-input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    width: 100%;
    padding: 16px 40px 16px 20px;
    font-size: var(--font-size-base);
    border: none;
    outline: none;
    background: transparent;
}

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

.search-clear-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--text-secondary);
    background-color: var(--gray-4);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-clear-btn:hover {
    color: var(--text-primary);
    background-color: var(--gray-5);
}

.search-btn {
    padding: 16px 32px;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: 0;
    border: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.search-icon {
    font-size: 18px;
}

/* Search Filters */
.search-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.filter-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.filter-select {
    padding: 6px 28px 6px 12px;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 10px;
}

.filter-select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
}

/* Search Suggestions */
.search-suggestions {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    max-height: 400px;
    overflow-y: auto;
}

.suggestions-section {
    padding: var(--spacing-sm) 0;
}

.suggestions-section:not(:last-child) {
    border-bottom: 1px solid var(--border-light);
}

.suggestions-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-md);
}

.suggestions-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.suggestions-clear {
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    background: transparent;
    border: none;
    cursor: pointer;
}

.suggestions-clear:hover {
    text-decoration: underline;
}

.suggestions-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.suggestion-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.suggestion-item:hover {
    background-color: var(--gray-3);
}

.suggestion-item .icon {
    color: var(--text-secondary);
    font-size: 14px;
}

.suggestion-item .remove {
    margin-left: auto;
    color: var(--text-disabled);
    font-size: 12px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.suggestion-item:hover .remove {
    opacity: 1;
}

.suggestion-item .remove:hover {
    color: var(--error-color);
}


/* ========================================
   Hot Search - 热门搜索组件
   ======================================== */
.hot-search {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.hot-search-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.hot-search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.hot-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.hot-tag:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background-color: var(--primary-light);
}

.hot-tag.hot-rank-1 {
    color: #ff4d4f;
    border-color: #ffccc7;
    background-color: #fff2f0;
}

.hot-tag.hot-rank-2 {
    color: #fa8c16;
    border-color: #ffd591;
    background-color: #fff7e6;
}

.hot-tag.hot-rank-3 {
    color: #faad14;
    border-color: #ffe58f;
    background-color: #fffbe6;
}

/* ========================================
   Categories Section - 分类导航
   ======================================== */
.categories-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-base);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.section-more {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    text-decoration: none;
}

.section-more:hover {
    text-decoration: underline;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg);
    background-color: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.category-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary-light), #f0f5ff);
    border-radius: 50%;
    margin-bottom: var(--spacing-sm);
}

.category-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.category-count {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.skeleton-card {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ========================================
   Features Section - 平台特色
   ======================================== */
.features-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-lg);
    background-color: var(--bg-base);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.feature-icon {
    font-size: 40px;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: var(--line-height-relaxed);
}

/* ========================================
   Drive Types Section - 支持的网盘
   ======================================== */
.drive-types-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-base);
}

.drive-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.drive-type-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background-color: var(--gray-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.drive-type-item:hover {
    background-color: var(--primary-light);
    transform: scale(1.05);
}

.drive-icon {
    font-size: 24px;
}

.drive-name {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-align: center;
}

/* ========================================
   Footer - 页脚
   ======================================== */
.footer {
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    background-color: var(--bg-dark);
    color: var(--text-inverse);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xl);
}

.footer-info {
    max-width: 360px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon {
    font-size: 24px;
}

.footer-logo .logo-text {
    color: var(--text-inverse);
    -webkit-text-fill-color: var(--text-inverse);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.65);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-xxl);
}

.footer-column {
    min-width: 120px;
}

.footer-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-inverse);
    margin-bottom: var(--spacing-md);
}

.footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-list li {
    margin-bottom: var(--spacing-sm);
}

.footer-list a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-list a:hover {
    color: var(--text-inverse);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.65);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.copyright {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.45);
    margin: 0;
}

/* ========================================
   Responsive Styles - 响应式布局
   ======================================== */
@media (max-width: 1023px) {
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-section {
        padding: var(--spacing-xl) 0;
        min-height: auto;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .search-box {
        flex-direction: column;
        border-radius: var(--radius-md);
    }
    
    .search-input {
        padding: 14px 40px 14px 16px;
    }
    
    .search-btn {
        width: 100%;
        justify-content: center;
        padding: 14px;
        border-radius: 0 0 var(--radius-md) var(--radius-md);
    }
    
    .search-filters {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .filter-group {
        width: 100%;
    }
    
    .filter-select {
        flex: 1;
    }
    
    .hot-search {
        flex-direction: column;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 479px) {
    .header-content {
        height: 56px;
    }
    
    .logo-text {
        display: none;
    }
    
    .user-area .btn {
        padding: 6px 12px;
        font-size: var(--font-size-xs);
    }
    
    .hero-title {
        font-size: 24px;
    }
    
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .categories-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }
    
    .category-card {
        padding: var(--spacing-md);
    }
    
    .category-icon {
        width: 44px;
        height: 44px;
        font-size: 22px;
    }
    
    .drive-types-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .drive-type-item {
        padding: var(--spacing-sm);
    }
}