:root {
    --primary-color: #4F46E5;
    --secondary-color: #10B981;
    --background-color: #F9FAFB;
    --card-color: #FFFFFF;
    --text-color: #374151;
    --accent-color: #F59E0B;
    --danger-color: #EF4444;
    --success-color: #10B981;
    --border-color: #E5E7EB;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--card-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.header h1 {
    font-size: 24px;
    color: var(--primary-color);
}

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

.step-indicator {
    display: flex;
    justify-content: space-between;
    padding: 20px;
    background: var(--card-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    overflow-x: auto;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    min-width: 80px;
    opacity: 0.5;
    transition: all 0.3s;
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 0.8;
}

.step-number {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--background-color);
    transition: all 0.3s;
}

.step.active .step-number {
    background: var(--primary-color);
    color: white;
}

.step.completed .step-number {
    background: var(--secondary-color);
    color: white;
}

.step-label {
    font-size: 12px;
    color: var(--text-color);
    text-align: center;
}

.main-content {
    background: var(--card-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 30px;
    min-height: 600px;
}

.step-section {
    display: none;
}

.step-section.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.section-header h2 {
    font-size: 20px;
    color: var(--primary-color);
}

.step-badge {
    padding: 6px 12px;
    background: var(--background-color);
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-color);
}

.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: 12px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--background-color);
    margin-bottom: 30px;
}

.upload-area:hover {
    background: rgba(79, 70, 229, 0.05);
    border-color: var(--accent-color);
}

.upload-content {
    pointer-events: none;
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.upload-text {
    font-size: 18px;
    color: var(--text-color);
    margin-bottom: 10px;
}

.upload-hint {
    font-size: 14px;
    color: #9CA3AF;
}

.uploaded-files {
    margin-bottom: 30px;
}

.uploaded-files h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.file-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.file-item {
    position: relative;
    width: 120px;
    height: 120px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--background-color);
}

.file-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-item .delete-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--danger-color);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-item .file-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 4px 8px;
    font-size: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.empty-state {
    color: #9CA3AF;
    font-style: italic;
    padding: 20px;
    text-align: center;
}

.progress-bar {
    height: 8px;
    background: var(--background-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 0.3s;
    width: 0%;
}

.progress-text {
    text-align: center;
    color: var(--text-color);
    font-size: 14px;
    margin-bottom: 20px;
}

.ocr-progress,
.analysis-progress,
.generate-progress,
.optimize-progress,
.fill-progress {
    padding: 30px;
    background: var(--background-color);
    border-radius: 12px;
    margin-bottom: 30px;
}

.generate-steps {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.gen-step {
    padding: 8px 16px;
    background: var(--card-color);
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-color);
    transition: all 0.3s;
}

.gen-step.active {
    background: var(--primary-color);
    color: white;
}

.gen-step.completed {
    background: var(--secondary-color);
    color: white;
}

.ocr-result,
.analysis-result,
.generate-result,
.optimize-result {
    margin-bottom: 30px;
}

.ocr-result h3,
.analysis-result h3,
.generate-result h3,
.optimize-result h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.result-content {
    position: relative;
}

.result-content textarea {
    width: 100%;
    min-height: 200px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    resize: vertical;
    font-family: inherit;
}

.result-content .btn-small {
    position: absolute;
    top: 10px;
    right: 10px;
}

.analysis-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.analysis-item {
    padding: 15px;
    background: var(--background-color);
    border-radius: 8px;
}

.analysis-item.full-width {
    grid-column: 1 / -1;
}

.analysis-item label {
    display: block;
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-weight: 600;
}

.analysis-item input,
.analysis-item textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

.word-plan {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.word-tag {
    padding: 6px 12px;
    background: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-color);
}

.lesson-plan-preview {
    padding: 20px;
    background: var(--background-color);
    border-radius: 8px;
    min-height: 200px;
}

.lesson-plan-preview h4 {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.lesson-plan-preview .section {
    margin-bottom: 20px;
}

.lesson-plan-preview .section h5 {
    font-size: 14px;
    color: var(--text-color);
    margin-bottom: 10px;
    padding-left: 10px;
    border-left: 3px solid var(--primary-color);
}

.lesson-plan-preview .section p {
    font-size: 14px;
    line-height: 1.8;
    padding-left: 20px;
}

.word-check {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.word-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background: var(--background-color);
    border-radius: 8px;
}

.word-status {
    font-size: 18px;
}

.word-name {
    font-weight: 600;
    min-width: 100px;
}

.word-count {
    color: var(--text-color);
}

.word-target {
    color: #9CA3AF;
}

.word-action {
    margin-left: auto;
    font-size: 13px;
    color: var(--accent-color);
}

.word-item.pass .word-status {
    color: var(--success-color);
}

.word-item.fail .word-status {
    color: var(--danger-color);
}

.template-selection {
    margin-bottom: 30px;
}

.template-intro {
    margin-bottom: 20px;
    color: var(--text-color);
}

.template-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.template-card {
    cursor: pointer;
}

.template-card input {
    display: none;
}

.template-content {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 20px;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s;
}

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

.template-card input:checked + .template-content {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.05);
}

.template-radio {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 2px;
    transition: all 0.3s;
}

.template-card input:checked + .template-content .template-radio {
    border-color: var(--primary-color);
    background: var(--primary-color);
    box-shadow: inset 0 0 0 4px white;
}

.template-info h4 {
    font-size: 16px;
    color: var(--text-color);
    margin-bottom: 5px;
}

.template-info p {
    font-size: 13px;
    color: #9CA3AF;
}

.template-preview h3 {
    font-size: 16px;
    margin-bottom: 15px;
}

.preview-content {
    padding: 30px;
    background: var(--background-color);
    border-radius: 8px;
}

.preview-doc {
    background: white;
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    line-height: 2;
}

.preview-doc h4 {
    text-align: center;
    font-size: 18px;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.preview-doc p {
    margin-bottom: 10px;
    color: #666;
}

.lesson-plan-final h3 {
    font-size: 16px;
    margin-bottom: 15px;
}

.final-doc {
    background: white;
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
}

.doc-header h2 {
    text-align: center;
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--primary-color);
}

.doc-section {
    margin-bottom: 25px;
}

.doc-section h3 {
    font-size: 16px;
    color: var(--text-color);
    margin-bottom: 10px;
    padding-left: 10px;
    border-left: 3px solid var(--primary-color);
}

.section-content {
    padding: 15px;
    background: var(--background-color);
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.8;
    min-height: 60px;
}

.success-page {
    text-align: center;
    padding: 60px 20px;
}

.success-icon {
    font-size: 80px;
    margin-bottom: 30px;
}

.success-page h2 {
    font-size: 24px;
    color: var(--success-color);
    margin-bottom: 30px;
}

.success-info {
    padding: 20px;
    background: var(--background-color);
    border-radius: 12px;
    margin-bottom: 40px;
    display: inline-block;
}

.success-info p {
    margin: 10px 0;
    font-size: 16px;
}

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

.action-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    margin-top: 30px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: #4338CA;
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
}

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

.btn-danger:hover:not(:disabled) {
    background: #DC2626;
}

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
}

.btn-small {
    padding: 6px 12px;
    font-size: 13px;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #9CA3AF;
    font-size: 14px;
    margin-top: 20px;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--card-color);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 18px;
    color: var(--primary-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #9CA3AF;
}

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

.modal-body {
    padding: 20px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

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

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-color);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transition: all 0.3s;
    z-index: 2000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .header h1 {
        font-size: 20px;
    }

    .step-indicator {
        padding: 15px;
    }

    .step {
        min-width: 60px;
    }

    .step-label {
        font-size: 10px;
    }

    .main-content {
        padding: 20px;
    }

    .section-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    .analysis-grid {
        grid-template-columns: 1fr;
    }

    .action-bar {
        flex-direction: column;
        gap: 10px;
    }

    .action-bar .btn {
        width: 100%;
    }

    .success-page {
        padding: 30px 15px;
    }

    .success-icon {
        font-size: 60px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }
}