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

:root {
    --primary-green: #2d5f4f;
    --light-green: #4a8070;
    --accent-green: #6ba892;
    --dark-green: #1a3a2e;
    --white: #ffffff;
    --off-white: #f8f9fa;
    --light-gray: #e9ecef;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

/* 导航栏 */
.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo h1 {
    color: var(--primary-green);
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: 2px;
}

.tagline {
    color: var(--accent-green);
    font-size: 0.85rem;
    margin-top: -5px;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-green);
    transition: width 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-green);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* 轮播图 */
.hero-slider {
    position: relative;
    width: 100%;
    height: 85vh;
    overflow: hidden;
    background-color: var(--dark-green);
}

.slider-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.slide.active {
    opacity: 1;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.7);
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--white);
    z-index: 2;
    width: 80%;
}

.slide-content h2 {
    font-size: 4rem;
    font-weight: 300;
    margin-bottom: 1rem;
    letter-spacing: 3px;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
}

.slide-content p {
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 2px;
    text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.5);
}

/* 轮播按钮 */
.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.5);
    padding: 1rem 1.2rem;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
    backdrop-filter: blur(5px);
}

.slider-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: var(--white);
}

.slider-btn.prev {
    left: 2rem;
}

.slider-btn.next {
    right: 2rem;
}

/* 轮播指示点 */
.slider-dots {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    z-index: 10;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.dot:hover,
.dot.active {
    background-color: var(--white);
    transform: scale(1.2);
}

/* 特色介绍 */
.features {
    padding: 5rem 0;
    background-color: var(--off-white);
}

.features .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.feature-card {
    background-color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(45, 95, 79, 0.15);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    color: var(--primary-green);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 文章区域 */
.articles {
    padding: 6rem 0;
    background-color: var(--white);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-green);
    margin-bottom: 3rem;
    font-weight: 300;
    letter-spacing: 2px;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(to right, var(--accent-green), var(--primary-green));
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.article-card {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(45, 95, 79, 0.15);
}

.article-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.article-card:hover .article-image img {
    transform: scale(1.1);
}

.article-content {
    padding: 2rem;
}

.article-tag {
    display: inline-block;
    background-color: var(--accent-green);
    color: var(--white);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.article-content h3 {
    color: var(--primary-green);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.4;
}

.article-content p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.read-more {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
    display: inline-flex;
    align-items: center;
}

.read-more:hover {
    color: var(--light-green);
}

/* 生物图鉴 */
.gallery {
    padding: 6rem 0;
    background-color: var(--off-white);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.gallery-item {
    position: relative;
    height: 350px;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(29, 58, 46, 0.95), transparent);
    color: var(--white);
    padding: 2rem;
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

.gallery-overlay h4 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.gallery-overlay p {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* 关于我们 */
.about {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--light-green) 100%);
    color: var(--white);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about .section-title {
    color: var(--white);
}

.about .section-title::after {
    background: linear-gradient(to right, var(--white), rgba(255, 255, 255, 0.5));
}

.about-content p {
    font-size: 1.1rem;
    line-height: 2;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

/* 页脚 */
.footer {
    background-color: var(--dark-green);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        gap: 1.5rem;
    }

    .slide-content h2 {
        font-size: 2.5rem;
    }

    .slide-content p {
        font-size: 1.2rem;
    }

    .slider-btn {
        padding: 0.8rem 1rem;
        font-size: 1.2rem;
    }

    .slider-btn.prev {
        left: 1rem;
    }

    .slider-btn.next {
        right: 1rem;
    }

    .articles-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 2rem;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.article-card,
.feature-card,
.gallery-item {
    animation: fadeIn 0.6s ease-out;
}