/* 21天AI能力养成训练营 - 网站样式 */

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

/* 导航栏 */
.navbar {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.navbar-brand .logo {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
}

.navbar-nav {
    display: flex;
    gap: 0.5rem;
    list-style: none;
}

.navbar-nav a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: all 0.2s;
    font-size: 0.9rem;
    font-weight: 500;
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

/* 主容器 */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: calc(100vh - 64px);
}

/* 页面标题 */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 卡片 */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

.btn-warning {
    background: var(--accent-color);
    color: white;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.1rem;
}

/* 首页样式 */
.hero {
    text-align: center;
    padding: 4rem 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-lg);
    color: white;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero .btn {
    background: white;
    color: #667eea;
    font-weight: 600;
}

.hero .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 路径选择 */
.path-selection {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.path-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 2px solid transparent;
    transition: all 0.2s;
    cursor: pointer;
}

.path-card:hover {
    border-color: var(--primary-color);
}

.path-card.recommended {
    border-color: var(--accent-color);
    position: relative;
}

.path-card .badge {
    position: absolute;
    top: -10px;
    right: 1rem;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.path-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.path-card .meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.path-card .features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.path-card .features li {
    padding: 0.25rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.path-card .features li::before {
    content: "✓";
    color: var(--secondary-color);
    margin-right: 0.5rem;
    font-weight: bold;
}

/* 测评页面 */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    margin: 0 1rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s;
}

.question-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.question-number {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.question-text {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}

.option:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.option input[type="radio"] {
    margin-top: 0.2rem;
}

.option.selected {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

/* 日历页面 */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.calendar-header {
    text-align: center;
    padding: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
    position: relative;
}

.calendar-day:hover {
    border-color: var(--primary-color);
}

.calendar-day .day-number {
    font-weight: 600;
    font-size: 1.1rem;
}

.calendar-day .day-status {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.calendar-day.completed {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--secondary-color);
}

.calendar-day.completed .day-number {
    color: var(--secondary-color);
}

.calendar-day.current {
    background: rgba(37, 99, 235, 0.1);
    border-color: var(--primary-color);
}

.calendar-day.current .day-number {
    color: var(--primary-color);
}

.calendar-day.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.calendar-day.milestone {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.2));
}

.calendar-day.milestone::after {
    content: "★";
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 0.7rem;
    color: var(--accent-color);
}

/* 学习页面 */
.lesson-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
}

.lesson-sidebar {
    position: sticky;
    top: 80px;
    height: fit-content;
}

.lesson-nav {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1rem;
    box-shadow: var(--shadow);
}

.lesson-nav h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-nav ul {
    list-style: none;
}

.lesson-nav li {
    margin: 0.25rem 0;
}

.lesson-nav a {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.lesson-nav a:hover,
.lesson-nav a.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.lesson-nav a.completed {
    color: var(--secondary-color);
}

.lesson-nav a.completed::before {
    content: "✓ ";
}

.lesson-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.lesson-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.lesson-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 1.25rem 0 0.75rem;
}

.lesson-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.lesson-content ul,
.lesson-content ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.lesson-content li {
    margin: 0.5rem 0;
}

.lesson-content code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-family: "Consolas", monospace;
    font-size: 0.9em;
}

.lesson-content pre {
    background: var(--bg-dark);
    color: #e5e7eb;
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1rem 0;
}

.lesson-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.lesson-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.lesson-content th,
.lesson-content td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
}

.lesson-content th {
    background: var(--bg-secondary);
    font-weight: 600;
}

/* 视频播放器 */
.video-container {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 1rem 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
    box-shadow: var(--shadow-lg);
}

.video-container video {
    display: block;
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    background: #000;
}

/* 任务提交 */
.task-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.task-section h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.task-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.task-status.pending {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-color);
}

.task-status.completed {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* 进度看板 */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.achievements {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.achievement {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
    opacity: 0.5;
}

.achievement.unlocked {
    opacity: 1;
    box-shadow: var(--shadow);
}

.achievement-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.achievement-name {
    font-size: 0.85rem;
    font-weight: 500;
}

/* 资源库 */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s;
}

.resource-card:hover {
    transform: translateY(-2px);
}

.resource-type {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.resource-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.resource-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* 结果页面 */
.result-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.result-score {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.result-level {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.result-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* 标签 */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag-primary {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.tag-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
}

.tag-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-color);
}

/* 警告框 */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.alert-info {
    background: rgba(37, 99, 235, 0.1);
    border-left: 4px solid var(--primary-color);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--secondary-color);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-left: 4px solid var(--accent-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar-nav {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .lesson-container {
        grid-template-columns: 1fr;
    }
    
    .lesson-sidebar {
        position: static;
        order: 2;
    }
    
    .calendar-grid {
        gap: 0.25rem;
    }
    
    .calendar-day {
        font-size: 0.8rem;
    }
    
    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .lesson-sidebar,
    .btn {
        display: none;
    }
    
    .lesson-content {
        box-shadow: none;
    }
}