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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

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

/* 头部 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 1px;
}

nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.6rem 1.2rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-weight: 500;
    border: 2px solid transparent;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* 主要内容 */
main {
    padding: 2rem 0;
}

.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 16px;
    margin-bottom: 3rem;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 1.3rem;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

/* 工具网格 */
.tools-preview {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.tools-preview h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
    font-weight: 700;
    border-left: 5px solid #667eea;
    padding-left: 1rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.tool-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(102, 126, 234, 0.2);
}

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

.tool-card h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.tool-card p {
    color: #666;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.tool-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.category {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.price {
    font-size: 1.5rem;
    color: #e74c3c;
    font-weight: 700;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.btn {
    display: inline-block;
    padding: 0.9rem 1.8rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    transition: all 0.3s ease;
    text-align: center;
    width: 100%;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* 帖子列表 */
.posts-preview {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.posts-preview h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
    font-weight: 700;
    border-left: 5px solid #667eea;
    padding-left: 1rem;
}

.posts-list {
    margin-top: 1.5rem;
}

.post-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
    position: relative;
    overflow: hidden;
}

.post-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.post-item:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.15);
}

.post-item:hover::before {
    transform: scaleY(1);
}

.post-item h4 {
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.post-item h4 a {
    color: #2c3e50;
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 600;
}

.post-item h4 a:hover {
    color: #667eea;
}

.post-item p {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.8;
    font-size: 0.95rem;
}

.post-item .post-summary {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.6;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    white-space: nowrap;
    max-width: 100%;
}

.post-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: #999;
    flex-wrap: wrap;
}

.post-meta .category {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.post-meta .views {
    color: #667eea;
    font-weight: 500;
}

.post-meta .date {
    color: #999;
}

/* 模态框 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.3s ease;
    position: relative;
}

.modal-header {
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin: 0;
    font-weight: 700;
}

.modal-body {
    margin-bottom: 2rem;
    color: #666;
    font-size: 1rem;
    line-height: 1.6;
}

.modal-footer {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.modal-btn {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 100px;
}

.modal-btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.modal-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.modal-btn-secondary {
    background: #f0f0f0;
    color: #333;
}

.modal-btn-secondary:hover {
    background: #e0e0e0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 消息提示 */
.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 4px;
    color: white;
    z-index: 1000;
    animation: slideIn 0.3s;
}

.message-info {
    background-color: #3498db;
}

.message-success {
    background-color: #27ae60;
}

.message-error {
    background-color: #e74c3c;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

/* 底部 */
footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    text-align: center;
    padding: 3rem 0;
    margin-top: 4rem;
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
}

footer p {
    font-size: 1rem;
    opacity: 0.9;
}

/* 响应式 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    nav {
        margin-top: 1rem;
    }
    
    nav a {
        margin: 0 0.5rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
}