/* * 山东大学公共卫生学科100周年庆典网站 - Modern Redesign
 */

:root {
    /* 核心色盘 */
    --primary-red: #7E1624; /* 更深沉的红，接近山大红 */
    --primary-red-light: #9A2233;
    --accent-gold: #C49F60; /* 更有质感的香槟金 */
    --accent-gold-bright: #E8CFA0;
    
    /* 中性色 */
    --text-dark: #2D2D2D;
    --text-gray: #666666;
    --text-light: #F9F9F9;
    --bg-page: #FCFBF7; /* 极淡的米色背景 */
    --bg-white: #FFFFFF;
    
    /* 尺寸与效果 */
    --max-width: 1400px;
    --border-radius: 12px;
    --shadow-soft: 0 10px 30px rgba(0,0,0,0.05);
    --shadow-hover: 0 20px 40px rgba(126, 22, 36, 0.15);
    --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* 全局重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-page);
    color: var(--text-dark);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: "Noto Serif SC", serif; /* 标题使用衬线体 */
    font-weight: 700;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }

/* --- 导航栏 (悬浮磨砂效果) --- */
.main-nav {
    position: sticky; /* 滚动时吸顶 */
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95); 
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(196, 159, 96, 0.2);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05); 
    transition: all 0.3s ease;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: center; /* 居中对齐 */
    padding: 0 20px;
}

.nav-list {
    display: flex;
    list-style: none;
}

.nav-link {
    display: block;
    padding: 20px 25px;
    color: var(--primary-red);
    font-weight: 500;
    font-size: 1.05rem;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--accent-gold);
    transform: translateX(-50%);
    transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 60%;
}

/* --- Banner 区域 --- */
.banner {
    position: relative;
    height: 100vh; /* 100vh 占据整个屏幕高度 */
    width: 100%;
    overflow: hidden;
    margin-bottom: 0;
}

.banner-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.05); 
    transition: transform 10s ease;
}

/* 遮罩层 - 极轻微，保留图片原始设计 */
.banner-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.05), rgba(0, 0, 0, 0.15));
}

.banner-text {
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-light);
    width: 90%;
    z-index: 2;
}

/* 滚动指示器 - 修改到贴近屏幕底部 */
.scroll-indicator {
    position: absolute;
    bottom: 30px; /* 关键修改：更贴近浏览器底部 */
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 50px;
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: 15px;
    animation: fadeUp 1s ease forwards 0.5s;
}

.scroll-indicator span {
    display: block;
    width: 6px;
    height: 6px;
    background: #fff;
    border-radius: 50%;
    margin: 8px auto;
    animation: scrollDot 2s infinite;
}

/* --- 通用区块样式 --- */
.main-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 20px;
    position: relative;
    top: 0; 
    z-index: 10;
}

.section {
    margin-bottom: 100px;
    background: var(--bg-white);
    padding: 60px;
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-subtitle {
    display: block;
    color: var(--accent-gold);
    font-size: 0.9rem;
    letter-spacing: 3px;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.section-title {
    color: var(--primary-red);
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.title-divider {
    width: 60px;
    height: 3px;
    background: var(--accent-gold);
    margin: 0 auto;
}

/* --- 通知公告 --- */
.notice-container {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); 
    gap: 40px;
    align-items: stretch;
}

.carousel {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    aspect-ratio: 16/10;
    width: 100%; 
}

.notice-list-wrapper {
    width: 100%; 
}

.carousel-item {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.carousel-item.active { opacity: 1; }

.carousel-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 30px;
    background: linear-gradient(transparent, rgba(0,0,0,0.85));
    color: #fff;
}

.carousel-caption h3 { font-size: 1.4rem; margin-bottom: 5px; }
.carousel-caption p { font-size: 0.95rem; opacity: 0.9; }

.carousel-control {
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(5px);
    border: none;
    color: var(--accent-gold);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    transition: var(--transition);
}
.carousel-control:hover { 
    background: var(--primary-red); 
    color: var(--accent-gold-bright);
}
.carousel-control.prev { left: 20px; }
.carousel-control.next { right: 20px; }

/* 列表优化 */
.notice-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.notice-item {
    display: flex;
    gap: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
    transition: var(--transition);
}

.notice-item:last-child { border-bottom: none; }

.notice-date-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 80px;
    height: 80px;
    background: #fdfdfd;
    border: 1px solid #eee;
    border-radius: 8px;
    color: var(--primary-red);
}

.notice-date-box .day { font-size: 1.8rem; font-weight: 700; line-height: 1; }
.notice-date-box .month { font-size: 0.75rem; color: #999; margin-top: 4px; }

.notice-content { flex: 1; }

.notice-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    display: block;
    margin-bottom: 6px;
    line-height: 1.4;
}

.notice-title:hover { color: var(--primary-red); }
.notice-desc { font-size: 0.9rem; color: var(--text-gray); }


/* --- 活动卡片 --- */
.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.activity-card {
    background: rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
}

.activity-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.card-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

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

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

.card-date {
    font-size: 0.85rem;
    color: var(--text-gray);
    font-weight: 500;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-content { padding: 25px; }

.card-content h3 { font-size: 1.25rem; margin-bottom: 10px; color: var(--primary-red); }
.card-content p { font-size: 0.95rem; color: var(--text-gray); margin-bottom: 15px; }

.read-more {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-gold);
    text-transform: uppercase;
}

/* --- 成果展示 (全新设计) --- */
.dark-bg {
    background: linear-gradient(135deg, #f7f0e6 0%, #faf6ef 50%, #f5ede0 100%);
    color: var(--text-dark);
}

.dark-bg .section-subtitle {
    color: var(--accent-gold);
}

.dark-bg .section-title {
    color: var(--primary-red);
}

.dark-bg .achievement-card {
    background: #fff;
    border: 1px solid rgba(196, 159, 96, 0.15);
    border-top: 4px solid var(--accent-gold);
}

.dark-bg .achievement-card:hover {
    background: #fff;
    border-top-color: var(--primary-red);
    box-shadow: var(--shadow-hover);
}

.dark-bg .achievement-info h3 {
    color: var(--text-dark);
}

.dark-bg .achievement-info p {
    color: var(--text-gray);
}

.achievements-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.achievement-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 30px;
    background: #fff; 
    border-top: 4px solid var(--accent-gold); /* 顶部金色强调线 */
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    min-height: 180px;
    justify-content: center;
}

.achievement-card:hover {
    border-top-color: var(--primary-red); /* 悬停变为红色 */
    box-shadow: var(--shadow-hover);
    transform: translateY(-8px);
}

.achievement-icon {
    color: var(--accent-gold);
    margin-bottom: 25px;
    padding: 20px;
    background: var(--bg-page);
    border-radius: 50%; /* 圆形图标底槽 */
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.achievement-card:hover .achievement-icon { 
    color: #fff; 
    background: var(--primary-red); /* 悬停填满红色 */
}

.achievement-info h3 { 
    font-size: 1.15rem; 
    margin-bottom: 12px; 
    color: var(--text-dark); 
}
.achievement-info p { 
    font-size: 0.9rem; 
    color: var(--text-gray); 
    line-height: 1.6;
}

/* --- 底部双栏布局 --- */
.dual-section {
    display: flex;
    gap: 30px;
    margin-bottom: 0;
}

.half-section {
    flex: 1;
    padding: 60px;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: white;
}

.donation-bg {
    background: linear-gradient(135deg, #f9f0f0, #fdf5f5);
    color: var(--text-dark);
}

.donation-bg h2 {
    color: var(--primary-red);
}

.donation-bg .intro {
    color: var(--text-gray);
    opacity: 1;
}

.donation-bg .feature-item {
    color: var(--text-dark);
}

.contact-bg {
    background: #f5f5f5;
    color: var(--text-dark);
}

.contact-bg h2 {
    color: var(--primary-red);
}

.contact-bg .contact-details li {
    border-bottom-color: rgba(0,0,0,0.08);
}

.content-box h2 { font-size: 2rem; margin-bottom: 20px; }
.content-box .intro { font-size: 1.1rem; opacity: 0.9; margin-bottom: 30px; }

.feature-list { margin-bottom: 30px; }
.feature-item { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }

.contact-details { list-style: none; margin-bottom: 30px; }
.contact-details li { margin-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 10px; }

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    text-align: center;
    width: fit-content;
}

.btn-primary { background: var(--primary-red); color: #fff; }
.btn-primary:hover { background: var(--primary-red-light); }
.btn-outline { border: 2px solid var(--primary-red); color: var(--primary-red); }
.btn-outline:hover { background: var(--primary-red); color: #fff; }

/* 查看更多按钮 */
.section-footer {
    text-align: center;
    margin-top: 60px;
    animation: fadeUp 0.8s ease forwards 0.3s;
}

.btn-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 40px;
    background: linear-gradient(135deg, var(--primary-red), var(--primary-red-light));
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    border: 2px solid var(--primary-red);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-more::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent-gold);
    z-index: -1;
    transition: var(--transition);
}

.btn-more:hover {
    border-color: var(--accent-gold);
    color: #fff;
}

.btn-more:hover::before {
    left: 0;
}

.btn-more span {
    transition: transform 0.3s ease;
}

.btn-more:hover span {
    transform: translateX(5px);
}

/* 成果展示专用深色按钮 */
.btn-more-dark {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-bright));
    color: var(--primary-red);
    border-color: var(--accent-gold);
}

.btn-more-dark::before {
    background: rgba(255,255,255,0.1);
}

.btn-more-dark:hover {
    border-color: #fff;
    color: #fff;
}

/* --- Footer --- */
.footer {
    background: #1a1a1a;
    color: #888;
    text-align: center;
    padding: 40px 0;
    margin-top: -20px;
    padding-top: 80px; 
}

.footer-links a { margin: 0 10px; color: #aaa; }
.footer-links a:hover { color: #fff; }

/* --- 动画类 --- */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scrollDot {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(20px); opacity: 0; }
}

.scroll-animate {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- 响应式 --- */
@media (max-width: 992px) {
    .notice-container, .dual-section, .achievements-container {
        grid-template-columns: 1fr;
        flex-direction: column;
    }
    .main-title { font-size: 2.5rem; }
    .banner { height: 60vh; }
    .main-content { padding: 40px 20px; }
    .section { padding: 40px 30px; }
}

@media (max-width: 768px) {
    .main-title {
        font-size: 1.8rem;
        letter-spacing: 4px;
    }
    .main-subtitle {
        font-size: 1rem;
        letter-spacing: 1px;
    }
    .banner { height: 50vh; }
    .section {
        padding: 30px 20px;
        margin-bottom: 40px;
        border-radius: 12px;
    }
    .section-title { font-size: 1.8rem; }
    .main-content { padding: 30px 15px; }

    /* 导航栏横向滚动 */
    .nav-list {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .nav-link {
        padding: 15px 16px;
        font-size: 0.95rem;
        white-space: nowrap;
    }

    /* 通知区域 */
    .notice-container {
        grid-template-columns: 1fr;
    }
    .carousel { aspect-ratio: 16/9; }

    /* 活动卡片单列 */
    .activities-grid {
        grid-template-columns: 1fr;
    }

    /* 成果卡片双列 */
    .achievements-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    .achievement-card { padding: 25px 15px; }

    /* 底部双栏变单列 */
    .dual-section { flex-direction: column; gap: 15px; }
    .half-section {
        padding: 40px 25px;
        border-radius: 12px;
    }

    .btn-more { padding: 12px 30px; font-size: 0.95rem; }
    .section-footer { margin-top: 30px; }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.4rem;
        letter-spacing: 2px;
    }
    .main-subtitle { font-size: 0.85rem; }
    .section-title { font-size: 1.5rem; }

    .achievements-container {
        grid-template-columns: 1fr;
    }

    .notice-item {
        flex-direction: column;
        gap: 10px;
    }
    .notice-date-box {
        flex-direction: row;
        min-width: auto;
        height: auto;
        padding: 8px 12px;
        gap: 8px;
    }
    .notice-date-box .day { font-size: 1.2rem; }
    .notice-date-box .month { margin-top: 0; }

    .carousel-caption h3 { font-size: 1.1rem; }
    .carousel-caption p { font-size: 0.85rem; }
    .carousel-control { width: 36px; height: 36px; }

    .content-box h2 { font-size: 1.5rem; }
}