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

/* 根变量定义 */
:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --error-color: #FF3B30;
    --background-color: #F2F2F7;
    --surface-color: #FFFFFF;
    --text-primary: #1C1C1E;
    --text-secondary: #8E8E93;
    --border-color: #E5E5EA;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 16px;
    --border-radius-small: 8px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #000000;
        --surface-color: #1C1C1E;
        --text-primary: #FFFFFF;
        --text-secondary: #8E8E93;
        --border-color: #38383A;
    }
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    min-height: 100vh;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-sm);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.nav {
    margin-bottom: var(--spacing-md);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    transition: all 0.2s ease;
}

.back-btn:hover {
    background-color: rgba(0, 122, 255, 0.1);
}

.back-btn svg {
    width: 20px;
    height: 20px;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* 主内容区域 */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 工具网格布局 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    width: 100%;
    max-width: 900px;
    margin-bottom: var(--spacing-xl);
}

/* 工具卡片样式 */
.tool-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    padding-bottom: 50px; /* 为底部图标留出空间 */
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
}

.tool-card:hover::before {
    opacity: 0.05;
}

.tool-card:active {
    transform: translateY(-4px);
}

.tool-card > * {
    position: relative;
    z-index: 1;
}

.tool-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: transform 0.3s ease;
}

.tool-card:hover .tool-icon {
    transform: scale(1.1);
}

.tool-icon svg {
    width: 32px;
    height: 32px;
}

.tool-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.tool-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
}

/* 访问次数和点赞统计样式 */
.tool-stats {
    position: absolute;
    bottom: 12px;
    left: 12px;
    right: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: #666;
}

.visit-count,
.like-count {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255, 255, 255, 0.9);
    padding: 4px 8px;
    border-radius: 12px;
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.visit-count {
    position: absolute;
    bottom: 0;
    left: 0;
}

.like-count {
    position: absolute;
    bottom: 0;
    right: 0;
}

.visit-count .count,
.like-count .count {
    font-weight: 500;
    color: #333;
}

/* 图标样式 */
.visit-icon, .like-icon-small {
    width: 14px;
    height: 14px;
    color: #666;
}

.like-icon-small {
    color: #e74c3c;
}

/* 工具页面头部样式已移除，使用默认居中样式 */

/* 点赞和收藏按钮样式已移除 */

/* 按钮动画和图标样式已移除 */

/* 占位卡片样式 */
.tool-card.placeholder {
    opacity: 0.6;
    cursor: default;
}

.tool-card.placeholder:hover {
    transform: none;
    box-shadow: var(--shadow-light);
}

.tool-card.placeholder::before {
    display: none;
}

.tool-card.placeholder .tool-icon {
    background: var(--text-secondary);
}

.tool-card.placeholder:hover .tool-icon {
    transform: none;
}

/* 页脚样式 */
.footer {
    text-align: center;
    padding: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }
    
    .tool-icon {
        width: 56px;
        height: 56px;
    }
    
    .tool-icon svg {
        width: 28px;
        height: 28px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card {
    animation: fadeInUp 0.6s ease forwards;
}

.tool-card:nth-child(1) { animation-delay: 0.1s; }
.tool-card:nth-child(2) { animation-delay: 0.2s; }
.tool-card:nth-child(3) { animation-delay: 0.3s; }
.tool-card:nth-child(4) { animation-delay: 0.4s; }
.tool-card:nth-child(5) { animation-delay: 0.5s; }
.tool-card:nth-child(6) { animation-delay: 0.6s; }

/* 焦点样式 */
.tool-card:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}