/* 工具、书籍、论文区域样式 */

/* 工具区域 */
.tools {
    padding: 6rem 0;
    background: rgba(26, 26, 46, 0.3);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.tool-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tool-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.tool-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(74, 144, 226, 0.1);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.tool-icon svg {
    width: 30px;
    height: 30px;
    color: var(--primary);
    transition: all 0.3s ease;
}

.tool-card:hover .tool-icon {
    background: rgba(74, 144, 226, 0.2);
    transform: scale(1.1);
}

.tool-card:hover .tool-icon svg {
    color: #fff;
}

.tool-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.tool-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tool-link:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

/* 书籍区域 */
.books {
    padding: 6rem 0;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.book-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    gap: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.book-cover {
    flex-shrink: 0;
    width: 80px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.book-icon {
    font-size: 2rem;
    color: white;
}

.book-info {
    flex: 1;
}

.book-info h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.book-author {
    font-size: 0.875rem;
    color: var(--primary);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.book-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.book-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* 论文区域 */
.papers {
    padding: 6rem 0;
    background: rgba(26, 26, 46, 0.3);
}

.papers-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.paper-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.paper-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.paper-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.paper-year {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
}

.paper-journal {
    background: rgba(155, 89, 182, 0.1);
    color: var(--secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(155, 89, 182, 0.2);
}

.paper-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.paper-authors {
    font-size: 0.9rem;
    color: var(--primary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.paper-abstract {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.paper-links {
    display: flex;
    gap: 1rem;
}

.paper-link {
    padding: 0.5rem 1rem;
    background: rgba(74, 144, 226, 0.1);
    color: var(--primary);
    text-decoration: none;
    border-radius: 15px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid rgba(74, 144, 226, 0.2);
    transition: all 0.3s ease;
}

.paper-link:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }

    .books-grid {
        grid-template-columns: 1fr;
    }

    .book-card {
        flex-direction: column;
        text-align: center;
    }

    .book-cover {
        align-self: center;
    }

    .paper-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .paper-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}