/* ACSL高级课程大纲页面样式 */
:root {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --secondary: #8b5cf6;
    --light: #f5f3ff;
    --dark: #1e1b4b;
    --accent: #f59e0b;
    --gray: #64748b;
    --light-gray: #f8fafc;
    --font-family: "Noto Sans SC", "仿宋", "FangSong", serif;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark);
    background-color: #ffffff;
    padding-top: 80px;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 导航栏样式 */
header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

/* 主要内容区域 */
.section {
    padding: 3rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1rem;
    position: relative;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 2px;
}

.section-title p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* 课程信息卡片 */
.course-info {
    background: linear-gradient(135deg, var(--light) 0%, #ede9fe 100%);
    padding: 2.5rem;
    border-radius: 15px;
    margin-bottom: 3rem;
    border: 1px solid rgba(124, 58, 237, 0.1);
}

.course-info h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
}

.course-info h3 i {
    margin-right: 0.5rem;
    color: var(--accent);
}

.course-info p {
    color: var(--gray);
    line-height: 1.8;
    font-size: 1.1rem;
}

/* 竞赛区域样式 */
.contest-section {
    margin-bottom: 3rem;
}

.contest-title {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 1.5rem 2rem;
    border-radius: 15px 15px 0 0;
    margin: 0;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.contest-title i {
    margin-right: 0.8rem;
    color: var(--accent);
}

.contest-content {
    background: white;
    border-radius: 0 0 15px 15px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

/* 主题卡片样式 */
.topic-card {
    background: var(--light-gray);
    padding: 1.5rem;
    border-radius: 12px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.topic-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(124, 58, 237, 0.15);
}

.topic-card h4 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    border-bottom: 2px solid rgba(124, 58, 237, 0.2);
    padding-bottom: 0.5rem;
}

.topic-card h4 i {
    margin-right: 0.5rem;
    color: var(--accent);
}

.topic-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.topic-list li {
    padding: 0.5rem 0;
    color: var(--gray);
    position: relative;
    padding-left: 1.5rem;
    line-height: 1.6;
}

.topic-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

.topic-list li:hover {
    color: var(--dark);
}

/* 学习建议样式 */
.learning-tips {
    list-style: none;
    margin: 0;
    padding: 0;
}

.learning-tips li {
    padding: 0.8rem 0;
    color: var(--gray);
    line-height: 1.7;
    border-bottom: 1px solid rgba(124, 58, 237, 0.1);
}

.learning-tips li:last-child {
    border-bottom: none;
}

.learning-tips strong {
    color: var(--primary);
}

/* 导航链接样式 */
.navigation-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.nav-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}

.nav-link i {
    margin-right: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .section-title h2 {
        font-size: 2rem;
    }
    
    .contest-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1.5rem;
    }
    
    .course-info {
        padding: 2rem;
    }
    
    .contest-title {
        padding: 1.2rem 1.5rem;
        font-size: 1.2rem;
    }
    
    .navigation-links {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-link {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 2rem 0;
    }
    
    .section-title h2 {
        font-size: 1.8rem;
    }
    
    .course-info {
        padding: 1.5rem;
    }
    
    .contest-content {
        padding: 1rem;
    }
    
    .topic-card {
        padding: 1rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.contest-section {
    animation: fadeInUp 0.6s ease-out;
}

.contest-section:nth-child(2) {
    animation-delay: 0.1s;
}

.contest-section:nth-child(3) {
    animation-delay: 0.2s;
}

.contest-section:nth-child(4) {
    animation-delay: 0.3s;
}