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

:root {
    --primary-color: #4a90e2;
    --secondary-color: #50c878;
    --accent-color: #f39c12;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: white;
    padding: 2rem 0;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #7f8c8d;
    font-size: 1rem;
}

/* Navigation */
.main-nav {
    background: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.main-nav .container {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-btn {
    flex: 1;
    min-width: 200px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--dark-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

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

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

/* Workspace */
.workspace {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ai-panel,
.stats-panel {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.ai-panel h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.stats-panel h4 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.stats p {
    margin: 0.5rem 0;
    font-size: 0.95rem;
}

.stats span {
    font-weight: bold;
    color: var(--primary-color);
}

.stat-detail {
    font-size: 0.85rem !important;
    color: #7f8c8d;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: var(--light-color);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 0.75rem 0;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    transition: width 0.5s ease;
    border-radius: var(--radius);
}

.language-toggle {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--light-color);
    border-radius: var(--radius);
}

.language-toggle label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
}

.ai-features {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.ai-btn {
    padding: 0.75rem;
    border: 2px solid var(--secondary-color);
    background: white;
    color: var(--dark-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.ai-btn small {
    color: #7f8c8d;
    font-size: 0.75rem;
}

.ai-btn:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateX(5px);
}

.ai-btn:hover small {
    color: white;
}

.ai-output {
    padding: 1rem;
    background: #f8f9fa;
    border-radius: var(--radius);
    min-height: 150px;
    border-left: 4px solid var(--accent-color);
}

.ai-output .placeholder {
    color: #95a5a6;
    font-style: italic;
    font-size: 0.9rem;
}

.ai-output .suggestion {
    color: var(--dark-color);
    line-height: 1.8;
}

/* Stats Panel */
.stats p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.stats span {
    font-weight: bold;
    color: var(--primary-color);
}

/* Editor Area */
.editor-area {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.title-input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1.5rem;
    font-weight: bold;
}

.title-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.editor-tools {
    display: flex;
    gap: 0.5rem;
}

.tool-btn {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.tool-btn:hover {
    background: var(--light-color);
    transform: scale(1.1);
}

.template-info {
    padding: 1rem;
    background: #e3f2fd;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
}

.template-info p {
    color: var(--dark-color);
    font-size: 0.95rem;
}

.main-editor {
    flex: 1;
    min-height: 500px;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1.1rem;
    line-height: 1.8;
    resize: vertical;
    font-family: inherit;
}

.main-editor:focus {
    outline: none;
    border-color: var(--primary-color);
}

.editor-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.secondary-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--accent-color);
    background: white;
    color: var(--dark-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.last-saved {
    font-size: 0.9rem;
    color: #7f8c8d;
}

.last-saved span {
    font-weight: bold;
}

/* Footer */
footer {
    background: white;
    padding: 2rem 0;
    margin-top: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
}

footer p {
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .workspace {
        grid-template-columns: 1fr;
    }

    .sidebar {
        order: 2;
    }

    .editor-area {
        order: 1;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .nav-btn {
        min-width: 150px;
        font-size: 0.9rem;
        padding: 0.75rem;
    }

    .main-editor {
        min-height: 400px;
    }

    .title-input {
        font-size: 1.2rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ai-output .suggestion {
    animation: fadeIn 0.5s ease;
}
/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    border: none;
    background: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #7f8c8d;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--primary-color);
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* Guidance Styles */
.guidance-step {
    padding: 1.5rem 0;
}

.step-label {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.question-text {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--dark-color);
    font-weight: 500;
}

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

.option-btn {
    padding: 0.75rem 1rem;
    border: 2px solid var(--primary-color);
    background: white;
    color: var(--primary-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    font-size: 1rem;
}

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

/* Outline Styles */
.outline {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.outline-item {
    padding: 0.75rem;
    background: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.outline-item:hover {
    background: #e8f0ff;
}

.outline-item.expanded {
    background: #e3f2fd;
}

.section-number {
    font-weight: bold;
    color: var(--primary-color);
    margin-right: 0.5rem;
}

.section-name {
    color: var(--dark-color);
    font-weight: 500;
}

.section-editor {
    display: none;
    width: 100%;
    min-height: 100px;
    margin-top: 0.5rem;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
}

.outline-item.expanded .section-editor {
    display: block;
}

/* Materials Panel */
.materials-panel {
    background: #fffbf0;
    border-left: 4px solid var(--accent-color);
}

.material-group {
    margin-bottom: 1rem;
}

.material-group h5 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.material-group ul {
    list-style: none;
    padding-left: 1rem;
}

.material-group li {
    padding: 0.5rem 0;
    color: var(--dark-color);
    border-bottom: 1px solid #f0e6d2;
    font-size: 0.95rem;
}

.material-group li:last-child {
    border-bottom: none;
}

/* Logic Repair Styles */
.logic-question {
    padding: 1.5rem 0;
}

.logic-answer {
    width: 100%;
    min-height: 120px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin: 1rem 0;
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
}

.logic-answer:focus {
    outline: none;
    border-color: var(--primary-color);
}

.logic-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.logic-complete {
    padding: 2rem;
    text-align: center;
    background: #f0fff4;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

.logic-complete p {
    color: var(--secondary-color);
    font-weight: 500;
}

/* Animation */
@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
/* Loading状态 */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--primary-color);
    font-size: 1rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* AI生成的内容样式 */
.ai-materials,
.ai-outline {
    background: #f0f9ff;
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 8px;
    animation: fadeIn 0.5s ease;
}

.ai-materials h5,
.ai-outline h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.material-content,
.outline-content {
    color: var(--dark-color);
    line-height: 1.8;
    white-space: pre-wrap;
}

.fallback-notice {
    background: #fff3cd;
    color: #856404;
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.progress-info {
    margin-top: 1rem;
    padding: 0.75rem;
    background: #e3f2fd;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--primary-color);
}

.question-label {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}