/* CSS变量定义 - 统一管理主题色 */
:root {
    --color-bg-primary: #f5f5f7;
    --color-bg-secondary: #f0f0f3;
    --color-bg-tertiary: #e8e8ed;
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-accent-blue: #0071e3;
    --color-accent-green: #34c759;
    --color-accent-orange: #ff9500;
    --color-accent-red: #ff3b30;
    --color-accent-yellow: #ffcc00;
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-bg-hover: rgba(255, 255, 255, 0.7);
    --glass-bg-active: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-border-hover: rgba(255, 255, 255, 0.5);
    --shadow-sm: 0 1px 0 rgba(255, 255, 255, 0.8);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 32px rgba(0, 0, 0, 0.08);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-2xl: 28px;
    --radius-3xl: 32px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 100%);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.8) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.6) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.7) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* 液态玻璃效果 */
.glass-effect {
    background: var(--glass-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md), inset var(--shadow-sm);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.glass-effect:hover {
    background: var(--glass-bg-hover);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 1);
}

/* 搜索区域 */
.search-section {
    border-radius: var(--radius-3xl);
    padding: 15px;
    margin-bottom: 35px;
    text-align: center;
}

.search-input {
    width: 100%;
    padding: 16px 24px;
    border: 2px solid #333;
    border-radius: var(--radius-xl);
    font-size: 16px;
    outline: none;
    transition: all var(--transition-normal);
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.05), var(--shadow-sm);
    margin-bottom: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    color: var(--color-text-primary);
}

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

.search-input:focus {
    background: var(--glass-bg-active);
    border-color: rgba(0, 113, 227, 0.5);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 0 rgba(255, 255, 255, 1), 0 0 0 3px rgba(0, 113, 227, 0.1);
    transform: translateY(-1px);
}

.search-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.search-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-xl);
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08), var(--shadow-sm);
    font-size: 15px;
    min-width: 130px;
    justify-content: center;
    background: rgba(255, 255, 255, 0.7);
    color: var(--color-text-primary);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border-hover);
}

.search-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), 0 1px 0 rgba(255, 255, 255, 1);
    background: rgba(255, 255, 255, 0.9);
}

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

.search-btn::after {
    content: '🔍';
    font-size: 16px;
    transition: transform var(--transition-normal);
}

.search-btn:nth-child(odd):hover::after {
    transform: scale(1.15) rotate(5deg);
}

.search-btn:nth-child(even):hover::after {
    transform: scale(1.15) rotate(-5deg);
}

/* 主内容布局 */
.main-content {
    display: flex;
    gap: 35px;
    align-items: flex-start;
}

/* 侧边栏 */
.sidebar {
    width: 320px;
    border-radius: var(--radius-2xl);
    padding: 28px;
    position: sticky;
    top: 30px;
    align-self: flex-start;
}

.sidebar h2 {
    margin-bottom: 24px;
    color: var(--color-text-primary);
    font-size: 1.4em;
    font-weight: 600;
    text-align: center;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    position: relative;
}

.sidebar h2::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-green));
    border-radius: 2px;
}

.hot-search {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hot-item {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    background: rgba(245, 245, 247, 0.6);
    transition: all var(--transition-normal);
    border: 1px solid var(--glass-border-hover);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
}

.hot-item:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateX(6px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08), 0 1px 0 rgba(255, 255, 255, 1);
}

.hot-rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-weight: 600;
    margin-right: 14px;
    color: var(--color-text-secondary);
    font-size: 13px;
    background: rgba(200, 200, 205, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border-hover);
    box-shadow: var(--shadow-sm);
}

.hot-item:nth-child(1) .hot-rank {
    background: rgba(255, 59, 48, 0.15);
    color: var(--color-accent-red);
    border-color: rgba(255, 59, 48, 0.2);
}

.hot-item:nth-child(2) .hot-rank {
    background: rgba(255, 149, 0, 0.15);
    color: var(--color-accent-orange);
    border-color: rgba(255, 149, 0, 0.2);
}

.hot-item:nth-child(3) .hot-rank {
    background: rgba(255, 204, 0, 0.15);
    color: var(--color-accent-yellow);
    border-color: rgba(255, 204, 0, 0.2);
}

.hot-title {
    flex: 1;
    font-size: 14px;
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 400;
    transition: all var(--transition-normal);
    line-height: 1.4;
}

.hot-title:hover {
    color: var(--color-accent-blue);
    font-weight: 500;
}

/* 内容区域 */
.content {
    flex: 1;
}

h1 {
    text-align: center;
    margin-bottom: 35px;
    color: var(--color-text-primary);
    font-size: 2.2em;
    font-weight: 700;
    padding: 20px 0;
    position: relative;
    overflow: hidden;
}

h1::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-green), var(--color-accent-orange), #ff2d55);
}

/* 工具网格 */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 45px;
}

.tool-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-slow);
}

.tool-card-link:hover .tool-card {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 1);
    background: rgba(255, 255, 255, 0.8);
}

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

.tool-card {
    padding: 28px;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-slow);
    will-change: transform;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-green), var(--color-accent-orange), #ff2d55);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.tool-card h2 {
    margin-bottom: 16px;
    color: var(--color-text-primary);
    font-size: 1.6em;
    font-weight: 600;
}

.tool-card p {
    margin-bottom: 0;
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.5;
}

/* 动画效果 */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.tool-card {
    animation: float 6s ease-in-out infinite;
}

.tool-card:nth-child(1) { animation-delay: 0s; }
.tool-card:nth-child(2) { animation-delay: 0.5s; }
.tool-card:nth-child(3) { animation-delay: 1s; }
.tool-card:nth-child(4) { animation-delay: 1.5s; }
.tool-card:nth-child(5) { animation-delay: 2s; }
.tool-card:nth-child(6) { animation-delay: 2.5s; }

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: static;
        margin-bottom: 35px;
    }
    
    .tool-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    h1 {
        font-size: 1.8em;
        padding: 16px;
    }
    
    .tool-card {
        padding: 24px;
    }
    
    .tool-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .sidebar {
        padding: 24px;
    }
    
    .hot-item {
        padding: 12px 16px;
    }
    
    .search-section {
        padding: 12px;
    }
    
    .search-input {
        padding: 14px 20px;
        font-size: 15px;
    }
    
    .search-btn {
        padding: 12px 28px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    :root {
        --radius-sm: 10px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-xl: 20px;
        --radius-2xl: 20px;
        --radius-3xl: 20px;
    }
    
    .container {
        padding: 15px 10px;
    }
    
    body {
        font-size: 14px;
    }
    
    h1 {
        font-size: 1.5em;
        padding: 12px 8px;
        margin-bottom: 25px;
    }
    
    .search-section {
        padding: 10px;
        margin-bottom: 25px;
    }
    
    .search-input {
        padding: 12px 16px;
        font-size: 14px;
        margin-bottom: 15px;
    }
    
    .search-buttons {
        gap: 10px;
    }
    
    .search-btn {
        padding: 10px 20px;
        font-size: 13px;
        min-width: 80px;
    }
    
    .sidebar {
        padding: 20px 15px;
    }
    
    .sidebar h2 {
        font-size: 1.2em;
        padding-bottom: 12px;
        margin-bottom: 20px;
    }
    
    .hot-item {
        padding: 10px 12px;
    }
    
    .hot-rank {
        width: 24px;
        height: 24px;
        font-size: 12px;
        margin-right: 10px;
    }
    
    .hot-title {
        font-size: 13px;
    }
    
    .tool-card {
        padding: 20px 15px;
    }
    
    .tool-card h2 {
        font-size: 1.3em;
        margin-bottom: 12px;
    }
    
    .tool-card p {
        font-size: 13px;
        line-height: 1.4;
    }
    
    .tool-grid {
        gap: 15px;
        margin-bottom: 30px;
    }
}

/* 移动端触摸优化 */
@media (hover: none) and (pointer: coarse) {
    .search-btn,
    .hot-item,
    .tool-card-link {
        -webkit-tap-highlight-color: transparent;
        -webkit-touch-callout: none;
        user-select: none;
    }
    
    .search-btn:active {
        transform: scale(0.95);
        background: rgba(255, 255, 255, 0.95);
    }
    
    .hot-item:active {
        transform: translateX(4px);
        background: rgba(255, 255, 255, 0.9);
    }
    
    .tool-card-link:active .tool-card {
        transform: translateY(-3px) scale(0.98);
        background: rgba(255, 255, 255, 0.9);
    }
    
    .search-input {
        font-size: 16px;
    }
    
    .tool-card {
        animation: none;
    }
}

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

::-webkit-scrollbar-track {
    background: rgba(245, 245, 247, 0.8);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    border: 2px solid rgba(245, 245, 247, 0.8);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}