/* 苹果典型色系变量 */
:root {
    --primary-blue: #007AFF;
    --primary-blue-hover: #0056CC;
    --secondary-blue: #5AC8FA;
    --background-primary: #FFFFFF;
    --background-secondary: #F2F2F7;
    --background-tertiary: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #8E8E93;
    --text-tertiary: #C7C7CC;
    --border-color: #E5E5EA;
    --shadow-light: rgba(0, 0, 0, 0.04);
    --shadow-medium: rgba(0, 0, 0, 0.08);
    --shadow-heavy: rgba(0, 0, 0, 0.12);
    --green: #34C759;
    --orange: #FF9500;
    --red: #FF3B30;
    --purple: #AF52DE;
    --pink: #FF2D92;
    --yellow: #FFCC00;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F7;
    --gray-200: #E5E5EA;
    --gray-300: #D1D1D6;
    --gray-400: #C7C7CC;
    --gray-500: #8E8E93;
    --gray-600: #636366;
    --gray-700: #48484A;
    --gray-800: #1C1C1E;
    --gray-900: #000000;
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-primary: #000000;
        --background-secondary: #1C1C1E;
        --background-tertiary: #2C2C2E;
        --text-primary: #FFFFFF;
        --text-secondary: #8E8E93;
        --text-tertiary: #636366;
        --border-color: #38383A;
        --shadow-light: rgba(255, 255, 255, 0.04);
        --shadow-medium: rgba(255, 255, 255, 0.08);
        --shadow-heavy: rgba(255, 255, 255, 0.12);
    }
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 16px var(--shadow-medium);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.mobile-menu-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.logo-icon {
    font-size: 1.8rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

/* 搜索区域 */
.search-section {
    flex: 1;
    max-width: 400px;
}

.search-box {
    position: relative;
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 12px 45px 12px 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    font-size: 14px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transition: all 0.3s ease;
    outline: none;
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.search-input:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.search-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    border-radius: 6px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 左侧抽屉样式 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100vh;
    background: var(--background-primary);
    border-right: 1px solid var(--border-color);
    z-index: 1000;
    transition: left 0.3s ease;
    overflow-y: auto;
    box-shadow: 2px 0 16px var(--shadow-medium);
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-secondary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.sidebar-toggle:hover {
    background: var(--background-tertiary);
}

.sidebar-nav {
    padding: 0;
}

.nav-category {
    border-bottom: 1px solid var(--border-color);
}

.nav-category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--background-primary);
}

.nav-category-header:hover {
    background: var(--background-secondary);
}

.nav-category-header.active {
    background: var(--primary-blue);
    color: white;
}

.nav-category-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    font-size: 14px;
}

.nav-category-icon {
    font-size: 16px;
}

.nav-category-arrow {
    transition: transform 0.3s ease;
    font-size: 12px;
}

.nav-category.expanded .nav-category-arrow {
    transform: rotate(90deg);
}

.nav-subcategories {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: var(--background-secondary);
}

.nav-category.expanded .nav-subcategories {
    max-height: 500px;
}

.nav-subcategory {
    padding: 12px 20px 12px 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    color: var(--text-secondary);
    border-left: 3px solid transparent;
}

.nav-subcategory:hover {
    background: var(--background-tertiary);
    color: var(--text-primary);
    border-left-color: var(--primary-blue);
}

.nav-subcategory.active {
    background: var(--background-tertiary);
    color: var(--primary-blue);
    border-left-color: var(--primary-blue);
    font-weight: 500;
}

.nav-subcategory {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.subcategory-name {
    flex: 1;
}

.subcategory-count {
    background: var(--gray-200);
    color: var(--text-secondary);
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 500;
    min-width: 20px;
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    .subcategory-count {
        background: var(--gray-600);
        color: var(--text-tertiary);
    }
}

.nav-subcategory:hover .subcategory-count,
.nav-subcategory.active .subcategory-count {
    background: var(--primary-blue);
    color: white;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* 主要内容区域 */
.main {
    padding: 20px 0 80px;
    margin-left: 0;
    transition: margin-left 0.3s ease;
}

.main.sidebar-open {
    margin-left: 300px;
}

/* 浮动菜单按钮 */
.floating-menu-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8) translateY(-10px);
}

/* 在大屏幕上隐藏浮动按钮 */
@media (min-width: 1025px) {
    .floating-menu-btn {
        display: none !important;
    }
}

.floating-menu-btn:hover {
    background: var(--primary-blue-hover);
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
}

.floating-menu-btn:active {
    transform: scale(0.95) translateY(0px);
}

.floating-menu-btn.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0px);
    animation: bounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3) translateY(-20px);
    }
    50% {
        opacity: 1;
        transform: scale(1.05) translateY(-5px);
    }
    70% {
        transform: scale(0.9) translateY(2px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0px);
    }
}

.sidebar.open ~ .floating-menu-btn {
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8) translateY(-10px);
}

/* 内容网格 */
.content-grid {
    display: grid;
    gap: 32px;
}

/* 分类卡片 */
.category-section {
    background: var(--background-primary);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 2px 16px var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.category-section:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px var(--shadow-medium);
}

.category-section.highlight {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1), 0 8px 32px var(--shadow-medium);
    transform: translateY(-2px);
}

.subcategory.highlight {
    border: 2px solid var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
    transform: scale(1.02);
}

.category-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.category-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: white;
    font-weight: 600;
}

/* 子分类网格 */
.subcategories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.subcategory {
    background: var(--background-secondary);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

.subcategory-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-color);
}

/* 网站链接列表 */
.websites-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.website-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--background-primary);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.website-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 122, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.website-item:hover::before {
    left: 100%;
}

.website-item:hover {
    transform: translateX(4px);
    border-color: var(--primary-blue);
    box-shadow: 0 4px 12px var(--shadow-light);
}

.website-favicon {
    width: 20px;
    height: 20px;
    margin-right: 12px;
    border-radius: 4px;
    background: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

.website-info {
    flex: 1;
    min-width: 0;
}

.website-name {
    font-weight: 500;
    font-size: 14px;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.website-description {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.website-url {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-left: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.website-item:hover .website-url {
    opacity: 1;
}

/* 分类颜色主题 */
.category-找IDEA .category-icon { background: var(--yellow); }
.category-验IDEA .category-icon { background: var(--orange); }
.category-实现它 .category-icon { background: var(--green); }
.category-监测它 .category-icon { background: var(--purple); }
.category-做强做大 .category-icon { background: var(--red); }
.category-学习类 .category-icon { background: var(--primary-blue); }
.category-工具类 .category-icon { background: var(--pink); }

/* 页脚 */
.footer {
    background: var(--background-primary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .main.sidebar-open {
        margin-left: 0;
    }
    
    .sidebar {
        left: -300px;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .floating-menu-btn {
        top: 80px; /* 避免与header重叠 */
    }
}

/* 桌面端默认显示侧边栏 */
@media (min-width: 1025px) {
    .main {
        margin-left: 300px;
    }
    
    .sidebar {
        left: 0;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header {
        padding: 16px 0;
    }
    
    .header-content {
        flex-direction: column;
        gap: 12px;
    }
    
    .logo {
        font-size: 1.3rem;
    }
    
    .search-section {
        max-width: 100%;
    }
    
    .main {
        padding: 16px 0 60px;
        margin-left: 0;
    }
    
    .sidebar {
        width: 280px;
        left: -280px;
    }
    
    .category-section {
        padding: 24px 20px;
    }
    
    .category-title {
        font-size: 1.5rem;
        margin-bottom: 20px;
    }
    
    .subcategories {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .subcategory {
        padding: 20px 16px;
    }
    
    .website-item {
        padding: 10px 12px;
    }
    
    .website-name {
        font-size: 13px;
    }
    
    .website-description {
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem;
    }
    
    .logo-icon {
        font-size: 1.5rem;
    }
    
    .search-input {
        padding: 10px 40px 10px 12px;
        font-size: 14px;
    }
    
    .search-btn {
        width: 28px;
        height: 28px;
    }
    
    .sidebar {
        width: 260px;
        left: -260px;
    }
    
    .floating-menu-btn {
        width: 44px;
        height: 44px;
        top: 75px;
        left: 16px;
    }
    
    .category-section {
        padding: 20px 16px;
    }
    
    .category-title {
        font-size: 1.3rem;
    }
    
    .subcategory-title {
        font-size: 1.1rem;
    }
}

/* 加载动画 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 0;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state-description {
    font-size: 0.9rem;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* 选中文本样式 */
::selection {
    background: rgba(0, 122, 255, 0.2);
    color: var(--text-primary);
}

/* 焦点样式 */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}