/* 全局样式和CSS变量 */
:root {
    --primary-color: #4f46e5;
    --secondary-color: #6366f1;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --surface-color: #1e1e2e;
    --background-color: #0f0f1a;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --border-color: #3d3d5c;
    --hover-color: #2d2d44;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #0f0f1a, #1e1e2e, #2d2d44) !important;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #1e1e2e, #2d2d44);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 100;
    border-bottom: 2px solid var(--border-color);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.achievements-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(99, 102, 241, 0.3);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    border: 1px solid rgba(99, 102, 241, 0.5);
}

.achievements-badge:hover {
    background: rgba(99, 102, 241, 0.5);
    transform: scale(1.05);
}

.badge-icon {
    font-size: 1.5rem;
}

.badge-count {
    font-weight: 700;
    font-size: 1.2rem;
}

/* 主布局 */
.main {
    display: flex;
    height: calc(100vh - 60px);
}

/* 侧边栏 */
.sidebar {
    width: 280px;
    background: var(--surface-color);
    border-right: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.2rem;
    color: var(--text-primary);
}

.project-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.project-item {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.3s;
    background: #252540;
    border: 2px solid #3d3d5c;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.project-item:nth-child(odd) {
    background: #202038;
}

.project-item:nth-child(even) {
    background: #2a2a48;
}

.project-item:hover {
    background: #35355a;
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.project-item.active {
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    color: white;
    border-color: #818cf8;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.project-item h4 {
    margin: 0.3rem 0;
    font-size: 1rem;
}

.project-item p {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.project-item.active p {
    color: rgba(255, 255, 255, 0.8);
}

.nav-item {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-item:hover {
    background: var(--hover-color);
    transform: translateX(5px);
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
}

.nav-item .level-badge {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.level-badge.入门 { background: #22c55e; color: white; }
.level-badge.进阶 { background: #f59e0b; color: white; }
.level-badge.高级 { background: #ef4444; color: white; }

.nav-item.active .level-badge {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* 主内容区 */
.content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.project-header {
    padding: 1.5rem 2rem;
    background: var(--surface-color);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.project-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* 面板容器 */
.panels-container {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.panel {
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
    overflow: hidden;
}

.panel:last-child {
    border-right: none;
}

.panel-header {
    padding: 1rem 1.5rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--hover-color);
}

.panel-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
}

.panel-content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.panel-content.scrollable {
    overflow-y: auto;
    padding: 1.5rem;
}

/* 代码练习区域 - 水平和垂直滚动（滚动条始终显示） */
.code-scrollable {
    overflow-x: scroll;
    overflow-y: scroll;
    height: 100%;
    display: flex;
    flex-direction: row;
}

.code-scrollable .CodeMirror {
    height: 100%;
    min-width: 800px;
    width: max-content !important;
}

.code-scrollable .CodeMirror-scroll {
    overflow-x: scroll !important;
    overflow-y: scroll !important;
    min-width: 800px;
}

/* 输出结果区域 - 支持水平和垂直滚动（滚动条始终显示） */
.output-scrollable {
    overflow-x: scroll !important;
    overflow-y: scroll !important;
    min-height: 200px;
    max-width: 100%;
    max-height: 100%;
    position: relative;
    padding: 0;
}

.output-scrollable .output-content-wrapper {
    min-width: 800px;
    width: max-content;
    padding: 1.5rem;
}

.output-scrollable::-webkit-scrollbar {
    height: 14px !important;
    width: 14px !important;
    display: block !important;
}

.output-scrollable::-webkit-scrollbar-track {
    background: #2a2a48;
    border-radius: 7px;
}

.output-scrollable::-webkit-scrollbar-thumb {
    background: #6366f1 !important;
    border-radius: 7px;
    border: 2px solid #2a2a48;
}

.output-scrollable::-webkit-scrollbar-thumb:hover {
    background: #818cf8 !important;
}

/* 参考答案区域 - 水平滚动 */
.solution-scrollable {
    overflow-x: auto;
    overflow-y: auto;
    min-width: 0;
}

.solution-scrollable pre,
.solution-scrollable code {
    min-width: 800px;
    width: max-content;
}

.placeholder {
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
    white-space: nowrap;
    min-width: 800px;
}

.theory-panel {
    flex: 1;
    min-width: 0;
    width: auto;
}

.center-panel {
    flex: 1.2;
    display: flex;
    flex-direction: column;
    min-width: 0;
    width: auto;
}

.right-panel {
    flex: 0.9;
    display: flex;
    flex-direction: column;
    min-width: 0;
    width: auto;
}

.code-panel, .output-panel, .solution-panel, .quiz-panel, .exam-panel {
    border-right: none;
    border-bottom: 2px solid var(--border-color);
    flex: 1;
    min-height: 48px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.code-panel {
    flex: 1.5;
}

.output-panel {
    flex: 1;
}

.solution-panel, .quiz-panel {
    flex: 1;
}

.CodeMirror {
    height: 100%;
    font-size: 0.95rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
}

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

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

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

.btn-secondary:hover {
    background: #4b5563;
}

.btn-small {
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    background: var(--hover-color);
    color: var(--text-primary);
}

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

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

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

/* 代码操作按钮 */
.code-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* 状态指示器 */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.status-indicator.ready {
    color: var(--success-color);
}

.status-indicator.loading {
    color: var(--warning-color);
}

/* 库信息 */
.library-info {
    padding: 1rem;
    background: var(--hover-color);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
}

.library-info .title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #6366f1;
    justify-content: space-between;
}

.collapse-btn {
    padding: 0.1rem 0.4rem;
    font-size: 1rem;
    line-height: 1;
    min-width: 24px;
    height: 24px;
}

.library-info.collapsed .packages {
    display: none;
}

.code-panel.collapsed .panel-content,
.code-panel.collapsed .library-info {
    display: none;
}

.output-panel.collapsed .panel-content {
    display: none;
}

.solution-panel.collapsed .panel-content,
.quiz-panel.collapsed .panel-content,
.exam-panel.collapsed .panel-content,
.theory-panel.collapsed .panel-content {
    display: none;
}

.resizer {
    background: #3d3d5c;
    cursor: row-resize;
    transition: background 0.2s;
    position: relative;
}

.resizer:hover {
    background: #6366f1;
}

.resizer.horizontal {
    height: 8px;
    min-height: 8px;
}

.resizer.vertical {
    width: 8px;
    min-width: 8px;
    cursor: col-resize;
}

.resizer::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
}

.resizer.vertical::before {
    width: 4px;
    height: 40px;
}

.library-info .packages {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.pkg-tag {
    padding: 0.25rem 0.75rem;
    background: #1e293b;
    border-radius: 12px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
    color: #818cf8;
}

.pkg-tag.loaded {
    background: #064e3b;
    color: #6ee7b7;
    border-color: #059669;
}

.pkg-tag.loading {
    background: #78350f;
    color: #fbbf24;
    border-color: #f59e0b;
}

/* 输出区域 */
.output-line {
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    padding: 0.1rem 0;
    white-space: pre-wrap;
    word-break: break-all;
}

.output-line.error {
    color: var(--error-color);
}

.output-line.success {
    color: var(--text-primary);
}

/* 理论内容样式 */
.theory-content {
    line-height: 1.8;
}

.theory-content h3 {
    color: var(--primary-color);
    margin: 2rem 0 1rem;
    font-size: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.theory-content h4 {
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
    font-size: 1.2rem;
}

.theory-content p {
    margin-bottom: 1rem;
}

.theory-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.theory-content li {
    margin-bottom: 0.5rem;
}

.theory-content code {
    background: var(--hover-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
    color: var(--primary-color);
}

/* 考试样式 */
.exam-question {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--hover-color);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.exam-question h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.exam-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.exam-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.exam-option:hover {
    background: var(--hover-color);
    transform: translateX(5px);
}

.exam-option.selected {
    border-color: var(--primary-color);
    background: #eef2ff;
}

.exam-option.correct {
    border-color: var(--success-color);
    background: #dcfce7;
}

.exam-option.incorrect {
    border-color: var(--error-color);
    background: #fee2e2;
}

.exam-result {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.exam-result.pass {
    background: #dcfce7;
    color: #166534;
}

.exam-result.fail {
    background: #fee2e2;
    color: #991b1b;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.modal-header h2 {
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s;
}

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

/* 成就样式 */
.achievement-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--hover-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

.achievement-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow);
}

.achievement-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 12px;
}

.achievement-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.achievement-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}



/* 代码头部额外区域 */
.code-header-extra {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        max-height: 200px;
    }
    
    .panels-container {
        flex-direction: column;
    }
    
    .panel {
        min-height: 300px;
    }
}