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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

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

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

.navbar-brand h1 {
    font-size: 1.8rem;
    margin: 0;
}

.navbar-menu ul {
    list-style: none;
    display: flex;
    gap: 30px;
    margin: 0;
}

.navbar-menu a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.3s ease;
    padding: 8px 15px;
    border-radius: 20px;
}

.navbar-menu a:hover {
    opacity: 0.9;
    background: rgba(255, 255, 255, 0.1);
}

.navbar-menu a.active {
    background: rgba(255, 255, 255, 0.2);
}

/* 数字人头像样式 */
.digital-avatar {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: pulse 2s ease-in-out infinite;
    overflow: hidden;
}

/* 个人信息部分样式 */
.profile-section {
    padding: 80px 0;
    background: white;
}

.profile-section h2 {
    text-align: center;
    margin-bottom: 50px;
    color: #2d3748;
}

.profile-content {
    display: flex;
    justify-content: center;
}

.profile-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    max-width: 600px;
    width: 100%;
}

.profile-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid #e2e8f0;
}

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

.profile-item .label {
    font-weight: 600;
    color: #4a5568;
}

.profile-item .value {
    color: #2d3748;
}

/* 数据看板部分样式 */
.dashboard-section {
    padding: 80px 0;
    background: #f5f7fa;
}

.dashboard-section h2 {
    text-align: center;
    margin-bottom: 50px;
    color: #2d3748;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.dashboard-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.dashboard-card h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: #2d3748;
    text-align: center;
}

.dashboard-card.full-width {
    grid-column: 1 / -1;
}

/* 职业目标部分样式 */
.goals-section {
    padding: 80px 0;
    background: white;
}

.goals-section h2 {
    text-align: center;
    margin-bottom: 50px;
    color: #2d3748;
}

.goals-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.goal-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.goal-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.goal-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2d3748;
}

.goal-card ul {
    margin-left: 20px;
    margin-top: 10px;
}

.goal-card li {
    margin-bottom: 8px;
    color: #4a5568;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-text {
        text-align: center;
    }
    
    .hero-text h2 {
        font-size: 2.2rem;
    }
    
    .hero-text h3 {
        font-size: 1.5rem;
    }
    
    .avatar, .digital-avatar {
        width: 150px;
        height: 150px;
    }
    
    .avatar-inner {
        width: 135px;
        height: 135px;
        font-size: 1.5rem;
    }
    
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .navbar-menu ul {
        gap: 15px;
    }
    
    .lesson-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-card.full-width {
        grid-column: 1;
    }
    
    .goals-content {
        grid-template-columns: 1fr;
    }
    
    .profile-card {
        padding: 20px;
    }
    
    .profile-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(30px, 30px);
    }
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1;
    text-align: left;
}

.hero-text h2 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    color: white;
    font-weight: 700;
    animation: slideInLeft 1s ease-out;
}

.hero-text .subtitle {
    font-size: 1.1rem;
    margin-bottom: 20px;
    opacity: 0.9;
    animation: slideInLeft 1s ease-out 0.2s both;
}

.hero-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: white;
    animation: slideInLeft 1s ease-out 0.4s both;
}

.hero-text p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
    animation: slideInLeft 1s ease-out 0.6s both;
}

.hero-text .btn {
    animation: slideInLeft 1s ease-out 0.8s both;
}

.hero-avatar {
    flex-shrink: 0;
    animation: slideInRight 1s ease-out;
}

.avatar {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: pulse 2s ease-in-out infinite;
}

.avatar-inner {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #667eea;
    font-size: 2rem;
    font-weight: bold;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

main {
    padding: 60px 0;
}

section {
    margin-bottom: 60px;
}

h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #2d3748;
}

.welcome-section {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.course-card {
    background: white;
    border-radius: 12px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.course-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.course-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #2d3748;
}

.course-card p {
    color: #718096;
    margin-bottom: 25px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: opacity 0.3s ease;
}

.btn:hover {
    opacity: 0.9;
}

/* 课程部分 */
.courses-section {
    padding: 80px 0;
    background: white;
}

.courses-section h2 {
    text-align: center;
    margin-bottom: 50px;
    color: #2d3748;
}

.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.lesson-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.lesson-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.lesson-card h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2d3748;
}

.lesson-card p {
    color: #718096;
    margin-bottom: 25px;
}

.lesson-card .btn {
    display: inline-block;
    padding: 10px 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-weight: 600;
    transition: opacity 0.3s ease;
}

.lesson-card .btn:hover {
    opacity: 0.9;
}

/* 关于部分 */
.about-section {
    padding: 80px 0;
    background: #f5f7fa;
}

.about-section h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #2d3748;
}

.about-content {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: 20px;
    line-height: 1.7;
}

.about-content ul {
    margin-left: 25px;
    margin-top: 20px;
}

.about-content li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 15px;
}

.about-content li:before {
    content: "•";
    color: #667eea;
    font-weight: bold;
    position: absolute;
    left: 0;
}

footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 0;
}

.course-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.course-header h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: white;
}

.course-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.back-link {
    display: inline-flex;
    align-items: center;
    color: white;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 20px;
}

.back-link:hover {
    text-decoration: underline;
}

.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.lesson-card {
    background: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease;
    cursor: pointer;
}

.lesson-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.12);
}

.lesson-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-bottom: 15px;
}

.lesson-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #2d3748;
}

.lesson-card p {
    color: #718096;
    font-size: 0.95rem;
}

.lesson-detail {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.lesson-detail h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #2d3748;
}

.lesson-content {
    margin-top: 20px;
}

.lesson-content h4 {
    font-size: 1.3rem;
    margin: 25px 0 15px;
    color: #4a5568;
}

.lesson-content h5 {
    font-size: 1.1rem;
    margin: 20px 0 10px;
    color: #2d3748;
}

/* 课程介绍部分 */
.lesson-intro {
    background: linear-gradient(135deg, #f6f9fc 0%, #edf2f7 100%);
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 30px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.lesson-intro h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #2d3748;
}

.lesson-intro p {
    font-size: 1.1rem;
    color: #4a5568;
    max-width: 800px;
    margin: 0 auto;
}

.python-logo {
    margin: 20px 0;
}

/* 信息框 */
.info-box {
    background: #e6fffa;
    border-left: 4px solid #38b2ac;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.info-box h5 {
    color: #2c7a7b;
    margin-top: 0;
}

/* 特性网格 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.feature-card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.feature-card h5 {
    margin-bottom: 10px;
    color: #2d3748;
}

.feature-card p {
    color: #718096;
    font-size: 0.95rem;
}

/* 成功框 */
.success-box {
    background: #f0fff4;
    border-left: 4px solid #38a169;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.success-box h5 {
    color: #276749;
    margin-top: 0;
}

/* FAQ 部分 */
.faq {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.faq h5 {
    color: #2d3748;
    margin: 15px 0 5px;
}

.faq p {
    margin-bottom: 15px;
    color: #4a5568;
}

/* 下一步部分 */
.next-step {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 12px;
    margin-top: 30px;
}

.next-step h5 {
    color: white;
    margin-top: 0;
}

.next-step p {
    opacity: 0.9;
}

/* 运算符表格 */
.operator-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.operator-table th,
.operator-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.operator-table th {
    background: #f7fafc;
    font-weight: 600;
    color: #2d3748;
}

.operator-table tr:hover {
    background: #f7fafc;
}

.operator-table tr:last-child td {
    border-bottom: none;
}

.lesson-content p {
    margin-bottom: 15px;
}

.lesson-content ul, .lesson-content ol {
    margin-left: 25px;
    margin-bottom: 15px;
}

.lesson-content li {
    margin-bottom: 8px;
}

code {
    background: #f7fafc;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    color: #e53e3e;
}

pre {
    background: #2d3748;
    color: #e2e8f0;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    position: relative;
}

pre code {
    background: none;
    color: #e2e8f0;
    padding: 0;
}

/* 代码运行器样式 */
.code-runner {
    background: #f8f9fa;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    margin: 10px 0 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.code-runner:hover {
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.code-runner-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #f1f3f4;
    border-bottom: 1px solid #e2e8f0;
}

.control-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.language {
    font-size: 0.9rem;
    color: #667eea;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.run-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.run-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.run-btn:active {
    transform: translateY(0);
}

.reset-btn {
    background: #f3f4f6;
    color: #4b5563;
    border: 1px solid #d1d5db;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background: #e5e7eb;
    border-color: #9ca3af;
    transform: translateY(-1px);
}

.reset-btn:active {
    transform: translateY(0);
}

.control-right {
    display: flex;
    align-items: center;
}

.collapse-btn {
    background: none;
    border: 1px solid #d1d5db;
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 0.8rem;
    color: #4b5563;
    cursor: pointer;
    transition: all 0.3s ease;
}

.collapse-btn:hover {
    background: #e5e7eb;
    border-color: #9ca3af;
}

.code-runner-output {
    padding: 16px;
    background: white;
    max-height: 300px;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.code-runner-output.collapsed {
    max-height: 0;
    padding: 0 16px;
    overflow: hidden;
}

.output-content {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.output-text {
    background: #f3f4f6;
    padding: 12px;
    border-radius: 6px;
    margin: 0;
    white-space: pre-wrap;
    color: #374151;
}

.loading {
    color: #667eea;
    font-style: italic;
    display: flex;
    align-items: center;
    gap: 8px;
}

.loading::before {
    content: '';
    width: 12px;
    height: 12px;
    border: 2px solid #667eea;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.success {
    color: #10b981;
    font-weight: 600;
}

.error {
    color: #ef4444;
    font-weight: 600;
}

.hidden {
    display: none !important;
}

.lesson-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}

.lesson-nav .btn {
    padding: 10px 25px;
}