/* 运维学习系统 - 样式文件 */

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

:root {
    --primary: #1890ff;
    --success: #52c41a;
    --warning: #faad14;
    --error: #ff4d4f;
    --bg-dark: #141414;
    --bg-card: #1f1f1f;
    --text-primary: #ffffff;
    --text-secondary: #8c8c8c;
    --border-color: #303030;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

#app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
.header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    margin-bottom: 30px;
}

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

.subtitle {
    font-size: 1.2em;
    color: rgba(255,255,255,0.8);
}

/* 导航标签 */
.nav-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 30px;
    padding: 10px;
    background: var(--bg-card);
    border-radius: 12px;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1em;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.1);
}

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

/* 课程网格 */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.course-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    cursor: pointer;
    transition: all 0.3s;
    border: 1px solid var(--border-color);
    position: relative;
}

.course-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px rgba(24, 144, 255, 0.2);
}

.course-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.course-card h3 {
    margin-bottom: 10px;
    font-size: 1.3em;
}

.course-desc {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.95em;
}

.course-meta {
    display: flex;
    gap: 15px;
    color: var(--text-secondary);
    font-size: 0.9em;
    margin-bottom: 15px;
}

.course-progress {
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #722ed1);
    transition: width 0.3s;
}

.course-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--error);
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75em;
}

/* 课程详情页 */
.page {
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.course-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.back-btn {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.course-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
}

.course-sidebar {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    height: fit-content;
}

.chapter {
    padding: 15px;
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
}

.chapter:hover, .chapter.active {
    background: rgba(24, 144, 255, 0.1);
}

.chapter-num {
    color: var(--primary);
    font-weight: bold;
}

.chapter-icon {
    margin-left: auto;
    color: var(--success);
}

.chapter-lessons {
    padding-left: 20px;
}

.lesson-item {
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.lesson-item:hover {
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
}

.lesson-item.completed {
    color: var(--success);
}

.lesson-content {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 30px;
}

.lesson-title-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.lesson-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    padding: 8px 16px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.action-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.favorite-btn {
    color: var(--warning);
}

.lesson-body {
    line-height: 1.8;
}

.lesson-section {
    margin-bottom: 30px;
}

.lesson-section h4 {
    margin-bottom: 15px;
    color: var(--primary);
}

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

.command-demo {
    background: #0d0d0d;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
}

.command-demo pre {
    margin: 0;
}

.command-demo code {
    color: #00ff00;
    font-family: 'Courier New', monospace;
    font-size: 0.95em;
}

.key-points {
    list-style: none;
    padding: 0;
}

.key-points li {
    padding: 10px 15px;
    background: rgba(24, 144, 255, 0.1);
    margin-bottom: 8px;
    border-radius: 6px;
    border-left: 3px solid var(--primary);
}

.lesson-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.navigation-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 30px;
}

.nav-btn {
    padding: 12px 30px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.quiz-section {
    background: var(--bg-dark);
    border-radius: 12px;
    padding: 25px;
}

.quiz-section h4 {
    margin-bottom: 20px;
}

.quiz-item {
    margin-bottom: 25px;
}

.quiz-options {
    display: grid;
    gap: 10px;
    margin-top: 10px;
}

.quiz-options label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    background: var(--bg-card);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.quiz-options label:hover {
    background: rgba(24, 144, 255, 0.1);
}

.submit-btn {
    padding: 12px 40px;
    background: var(--success);
    border: none;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s;
}

.submit-btn:hover {
    opacity: 0.9;
    transform: scale(1.02);
}

/* 动画模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.close-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-dark);
    color: var(--text-primary);
    border-radius: 50%;
    font-size: 1.5em;
    cursor: pointer;
    transition: all 0.3s;
}

.close-btn:hover {
    background: var(--error);
}

.animation-modal-content {
    max-width: 900px;
}

.animation-container {
    background: var(--bg-dark);
    border-radius: 12px;
    padding: 40px;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.anim-step {
    padding: 20px;
    margin: 10px;
    background: var(--bg-card);
    border-radius: 8px;
    opacity: 0.5;
    transition: all 0.5s;
}

.anim-step.active {
    opacity: 1;
    background: var(--primary);
    transform: scale(1.05);
}

.animation-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.anim-ctrl-btn {
    padding: 10px 25px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.anim-ctrl-btn:hover {
    border-color: var(--primary);
}

/* 登录模态框 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 12px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1em;
}

.form-buttons {
    display: flex;
    gap: 15px;
}

.btn-primary {
    flex: 1;
    padding: 12px;
    background: var(--primary);
    border: none;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    flex: 1;
    padding: 12px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s;
}

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

/* 终端模拟器 */
.terminal-container {
    display: none;
}

.terminal {
    background: #0a0a0a;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.terminal-header {
    background: #1a1a1a;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.terminal-title {
    color: var(--text-secondary);
}

.terminal-os {
    padding: 6px 12px;
    background: #2a2a2a;
    border: none;
    color: white;
    border-radius: 4px;
}

.terminal-body {
    padding: 20px;
    min-height: 500px;
}

.terminal-output {
    color: #00ff00;
    font-family: 'Courier New', monospace;
    margin-bottom: 20px;
}

.terminal-output p {
    margin-bottom: 5px;
}

.terminal-output ul {
    margin: 10px 0;
    padding-left: 20px;
}

.terminal-output .tip {
    color: var(--primary);
    margin-top: 15px;
}

.terminal-input-line {
    display: flex;
    align-items: center;
    gap: 10px;
}

.prompt {
    color: var(--success);
    font-family: 'Courier New', monospace;
}

.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    color: #00ff00;
    font-family: 'Courier New', monospace;
    font-size: 1em;
    outline: none;
}

.cmd {
    color: white;
}

/* 个人中心 */
.profile-container {
    display: none;
    max-width: 800px;
    margin: 0 auto;
}

.profile-header {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--bg-card);
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 30px;
}

.avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), #722ed1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5em;
    color: white;
}

.user-info h3 {
    margin-bottom: 5px;
}

.user-info p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 2.5em;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-secondary);
}

.achievements-section, .favorites-section {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.achievements-section h4, .favorites-section h4 {
    margin-bottom: 20px;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
}

.achievement {
    padding: 15px;
    text-align: center;
    background: var(--bg-dark);
    border-radius: 8px;
    opacity: 0.4;
}

.achievement.unlocked {
    opacity: 1;
    background: rgba(24, 144, 255, 0.1);
    border: 1px solid var(--primary);
}

.achievement-icon {
    display: block;
    font-size: 2em;
    margin-bottom: 5px;
}

.achievement-name {
    font-size: 0.85em;
    color: var(--text-secondary);
}

.favorites-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.favorite-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: var(--bg-dark);
    border-radius: 8px;
    cursor: pointer;
}

.favorite-item:hover {
    background: rgba(255,255,255,0.05);
}

.favorite-item button {
    background: none;
    border: none;
    color: var(--error);
    font-size: 1.2em;
    cursor: pointer;
}

.login-prompt {
    text-align: center;
    padding: 50px;
}

.login-prompt h3 {
    margin-bottom: 20px;
}

/* 面试题库 */
.interview-list {
    display: none;
}

.interview-categories {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.interview-cat-btn {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.interview-cat-btn.active, .interview-cat-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.interview-questions {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.interview-item {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
}

.question {
    padding: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s;
}

.question:hover {
    background: rgba(255,255,255,0.02);
}

.q-num {
    background: var(--primary);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: bold;
}

.q-text {
    flex: 1;
}

.q-cat {
    color: var(--text-secondary);
    font-size: 0.85em;
}

.answer {
    padding: 20px;
    background: var(--bg-dark);
    border-top: 1px solid var(--border-color);
}

.answer pre {
    background: #0d0d0d;
    padding: 15px;
    border-radius: 8px;
    margin-top: 10px;
    overflow-x: auto;
}

/* 案例网格 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.case-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.case-header {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.case-level {
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8em;
    font-weight: bold;
}

.case-level.easy {
    background: rgba(82, 196, 26, 0.2);
    color: var(--success);
}

.case-level.medium {
    background: rgba(250, 173, 20, 0.2);
    color: var(--warning);
}

.case-level.hard {
    background: rgba(255, 77, 79, 0.2);
    color: var(--error);
}

.case-type {
    color: var(--text-secondary);
    font-size: 0.85em;
}

.case-card h4 {
    margin-bottom: 10px;
}

.case-card p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.95em;
}

.case-commands {
    background: var(--bg-dark);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 0.9em;
}

.case-commands code {
    display: block;
    margin-top: 8px;
    color: #00ff00;
}

.case-btn {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .course-content {
        grid-template-columns: 1fr;
    }
    
    .course-sidebar {
        order: 2;
    }
    
    .lesson-content {
        order: 1;
    }
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8em;
    }
    
    .nav-tabs {
        justify-content: center;
    }
    
    .tab-btn {
        padding: 10px 16px;
        font-size: 0.9em;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
    }
    
    .lesson-title-bar {
        flex-direction: column;
        gap: 15px;
    }
    
    .navigation-buttons {
        flex-direction: column;
    }
}