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

:root {
    --primary-color: #2d5016;
    --secondary-color: #4a7c2a;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f5f7f3;
    --border-color: #d4d9cc;
    --shadow: 0 4px 6px -1px rgba(45, 80, 22, 0.1), 0 2px 4px -1px rgba(45, 80, 22, 0.06);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 0 30px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
}

.nav-container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 1rem 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-logo a:hover {
    color: var(--secondary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link.active {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
}

/* 区块 */
.section {
    padding: 100px 0 80px;
    min-height: calc(100vh - 80px);
}

.datasets-section {
    background: var(--bg-light);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-align: center;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.section-title i {
    color: var(--primary-color);
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

/* 页脚 */
.footer {
    background: var(--text-color);
    color: #e5e7eb;
    padding: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

.footer a {
    color: var(--secondary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    .hamburger {
        display: flex;
    }
}