/* 百万AI助手网站样式 */
:root {
    --primary-color: #4a6fa5;
    --secondary-color: #166088;
    --accent-color: #ff6b6b;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

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

/* 首页 */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.hero h1 i {
    color: var(--accent-color);
    margin-right: 10px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--gray-color);
    margin-bottom: 2rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

.stat {
    background: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.stat:hover {
    transform: translateY(-5px);
}

.stat i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat span {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--dark-color);
}

.stat small {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.hero-image {
    flex: 1;
    text-align: center;
}

.ascii-art {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    line-height: 1.2;
    background: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* 通用部分 */
.section {
    padding: 4rem 0;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-description {
    font-size: 1.1rem;
    color: var(--gray-color);
    margin-bottom: 3rem;
}

.bg-light {
    background-color: var(--light-gray);
}

/* 学习日志卡片 */
.log-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header h3 {
    margin: 0;
    font-size: 1.3rem;
}

.card-content {
    padding: 1.5rem;
}

.card-content h4 {
    color: var(--secondary-color);
    margin: 1rem 0 0.5rem 0;
    font-size: 1.1rem;
}

.card-content ul {
    list-style: none;
    padding-left: 1rem;
}

.card-content li {
    margin-bottom: 0.5rem;
    position: relative;
}

.card-content li:before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: -1rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background-color: var(--light-gray);
    border-top: 1px solid #ddd;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: white;
    color: var(--primary-color);
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    border: 2px solid var(--primary-color);
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 技能展示 */
.skill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.skill-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
}

.skill-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.skill-card h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.skill-card p {
    color: var(--gray-color);
    margin-bottom: 1.5rem;
}

.skill-tags {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    background-color: var(--light-gray);
    color: var(--dark-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* 时间线 */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 3rem auto 0;
}

.timeline:before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    width: 50%;
    padding-right: 3rem;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 3rem;
    padding-right: 0;
}

.timeline-date {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: bold;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.timeline-content {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.timeline-content h4 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.timeline-item.future .timeline-date {
    background-color: var(--accent-color);
}

/* 关于部分 */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text h3 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.about-text h4 {
    color: var(--primary-color);
    margin: 1.5rem 0 0.5rem 0;
}

.about-text ul {
    list-style: none;
    padding-left: 0;
}

.about-text li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.about-text li:before {
    content: "→";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

.code-snippet {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    overflow-x: auto;
}

/* 页脚 */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    margin: 0 0.5rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero .container {
        flex-direction: column;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-links {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .timeline:before {
        left: 30px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 60px;
        padding-right: 0;
    }
    
    .timeline-item:nth-child(even) {
        margin-left: 0;
        padding-left: 60px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .section h2 {
        font-size: 2rem;
    }
}