:root{--color-primary: #6366f1;--color-primary-dark: #4f46e5;--color-primary-light: #e0e7ff;--color-secondary: #ec4899;--color-accent: #8b5cf6;--color-background: #f8fafc;--color-surface: #ffffff;--color-surface-hover: #f1f5f9;--color-text-main: #0f172a;--color-text-muted: #64748b;--color-border: #e2e8f0;--color-success: #10b981;--color-error: #ef4444;--color-warning: #f59e0b;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease}[data-theme=dark]{--color-primary: #818cf8;--color-primary-dark: #6366f1;--color-primary-light: #312e81;--color-secondary: #f472b6;--color-accent: #a78bfa;--color-background: #0f172a;--color-surface: #1e293b;--color-surface-hover: #334155;--color-text-main: #f1f5f9;--color-text-muted: #94a3b8;--color-border: #334155;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .3);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4), 0 2px 4px -2px rgb(0 0 0 / .3);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .4), 0 4px 6px -4px rgb(0 0 0 / .3);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .5), 0 8px 10px -6px rgb(0 0 0 / .4)}*,*:before,*:after{box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--color-background);color:var(--color-text-main);margin:0;padding:0;line-height:1.6;min-height:100vh;transition:background-color var(--transition-normal),color var(--transition-normal)}#root{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;border-radius:var(--radius-md);font-weight:500;font-size:.9rem;cursor:pointer;transition:all var(--transition-fast);border:1px solid transparent;outline:none;background-color:var(--color-surface);color:var(--color-text-main);font-family:inherit}.btn:hover{background-color:var(--color-surface-hover);transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:focus-visible{box-shadow:0 0 0 3px var(--color-primary-light)}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-accent));color:#fff;border:none}.btn-primary:hover{background:linear-gradient(135deg,var(--color-primary-dark),var(--color-primary));box-shadow:var(--shadow-md)}.btn-ghost{background:transparent;color:var(--color-text-muted)}.btn-ghost:hover{background-color:var(--color-surface-hover);color:var(--color-text-main)}.btn-icon{padding:.5rem;min-width:2.25rem;min-height:2.25rem}.card{background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);padding:1.5rem;transition:box-shadow var(--transition-normal),border-color var(--transition-normal)}.card:hover{box-shadow:var(--shadow-md)}.card-elevated{box-shadow:var(--shadow-lg)}.header{background:var(--color-surface);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:50;transition:background-color var(--transition-normal),border-color var(--transition-normal)}[data-theme=dark] .header{background:#1e293be6}.header-container{height:4rem;display:flex;align-items:center;justify-content:space-between}.header-brand{display:flex;align-items:center;gap:.75rem}.header-logo{width:2.5rem;height:2.5rem;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1rem;box-shadow:var(--shadow-md)}.header-title{font-size:1.25rem;font-weight:700;background:linear-gradient(to right,var(--color-primary-dark),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0}.header-actions{display:flex;gap:.75rem;align-items:center}.input-section{max-width:800px;margin:2rem auto}.input-area{width:100%;min-height:300px;padding:1rem;border-radius:var(--radius-md);border:2px solid var(--color-border);font-size:1rem;font-family:inherit;resize:vertical;outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);background-color:var(--color-surface);color:var(--color-text-main);line-height:1.8}.input-area:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.input-area::placeholder{color:var(--color-text-muted)}.input-actions{display:flex;justify-content:space-between;align-items:center;margin-top:1rem}.image-preview-container{margin-bottom:1rem;padding:1rem;background-color:var(--color-surface-hover);border-radius:var(--radius-md);border:1px dashed var(--color-border)}.image-preview-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem}.image-preview-title{margin:0;font-size:.9rem;color:var(--color-text-muted);font-weight:500}.image-preview{max-width:100%;max-height:300px;border-radius:var(--radius-md);object-fit:contain;display:block}.processing-card{max-width:600px;margin:4rem auto;text-align:center;padding:3rem}.spinner{width:4rem;height:4rem;border:4px solid var(--color-surface-hover);border-top:4px solid var(--color-primary);border-radius:50%;margin:0 auto 2rem;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.processing-title{font-size:1.25rem;margin-bottom:1.5rem;color:var(--color-text-main)}.processing-steps{display:flex;flex-direction:column;gap:.75rem;align-items:center}.processing-step{display:flex;align-items:center;gap:.5rem;transition:all var(--transition-normal)}.processing-step.completed{color:var(--color-success)}.processing-step.active{color:var(--color-primary);font-weight:600}.processing-step.pending{color:var(--color-text-muted);opacity:.5}.processing-finalizing{margin-top:1rem;color:var(--color-primary);font-size:.9rem;animation:pulse 1.5s infinite}@keyframes pulse{0%,to{opacity:.6}50%{opacity:1}}.review-container{padding:2rem 0}.review-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;flex-wrap:wrap;gap:1rem}.review-title{font-size:1.5rem;font-weight:700;margin:0}.review-actions{display:flex;gap:1rem}.review-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-bottom:2rem;align-items:start}@media(max-width:768px){.review-grid{grid-template-columns:1fr}}.review-card-title{font-size:1rem;font-weight:600;margin:0 0 1rem}.text-display{white-space:pre-wrap;line-height:1.8;padding:1rem;min-height:300px;border-radius:var(--radius-md);font-size:.95rem}.text-original{color:var(--color-text-muted);background-color:var(--color-surface-hover)}.text-improved{color:var(--color-text-main);background-color:var(--color-surface);border:1px solid var(--color-border)}.text-editor{width:100%;min-height:300px;padding:1rem;border:1px solid var(--color-border);border-radius:var(--radius-md);outline:none;resize:none;font-size:.95rem;line-height:1.8;font-family:inherit;color:var(--color-text-main);background-color:var(--color-surface);overflow:hidden}.text-editor:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.diff-removed{background-color:#ffeef0;color:#d93025;text-decoration:line-through;padding:0 2px;border-radius:2px}.diff-added{background-color:#e6fffa;color:#137333;font-weight:600;padding:0 2px;border-radius:2px}[data-theme=dark] .diff-removed{background-color:#ef444433;color:#fca5a5}[data-theme=dark] .diff-added{background-color:#10b98133;color:#6ee7b7}.feedback-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem}.feedback-item{padding:1rem;background-color:var(--color-surface-hover);border-radius:var(--radius-md);border-left:4px solid var(--color-accent);transition:transform var(--transition-fast)}.feedback-item:hover{transform:translate(4px)}.feedback-type{display:block;margin-bottom:.5rem;font-weight:600;color:var(--color-primary)}.feedback-message{margin:0;font-size:.9rem;color:var(--color-text-muted)}.teacher-note-area{width:100%;height:120px;padding:1rem;border-radius:var(--radius-md);border:1px solid var(--color-border);font-family:inherit;font-size:.95rem;resize:vertical;outline:none;background-color:var(--color-surface);color:var(--color-text-main);transition:border-color var(--transition-fast)}.teacher-note-area:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.report-container{padding:2rem 0;max-width:900px;margin:0 auto}.report-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.report-content{background:var(--color-surface);padding:3rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid var(--color-border)}.report-title-section{border-bottom:2px solid var(--color-primary);padding-bottom:1rem;margin-bottom:2rem;display:flex;justify-content:space-between;align-items:flex-start}.report-main-title{font-size:1.8rem;color:var(--color-primary-dark);margin:0}.report-date{color:var(--color-text-muted);margin:.5rem 0 0;font-size:.9rem}.report-score{text-align:right}.report-score-value{font-size:2.5rem;font-weight:700;color:var(--color-accent)}.report-score-label{color:var(--color-text-muted);font-size:.85rem}.report-comparison{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-bottom:2rem}@media(max-width:768px){.report-comparison{grid-template-columns:1fr}}.report-section-label{text-transform:uppercase;font-size:.8rem;letter-spacing:1px;margin-bottom:.5rem;font-weight:600}.report-text{font-size:.95rem;line-height:1.6}.report-analysis{margin-bottom:2rem}.report-analysis-title{font-size:1.2rem;margin-bottom:1rem;border-left:4px solid var(--color-secondary);padding-left:.75rem}.report-analysis-list{list-style:none;padding:0;margin:0}.report-analysis-item{margin-bottom:.75rem;display:flex;gap:.75rem}.report-analysis-bullet{color:var(--color-secondary);font-weight:700}.teacher-note-section{background-color:var(--color-surface-hover);padding:1.5rem;border-radius:var(--radius-md);border:1px dashed var(--color-primary)}.teacher-note-title{font-size:1.1rem;margin:0 0 .5rem;color:var(--color-primary-dark)}.teacher-note-text{margin:0;font-style:italic;color:var(--color-text-main)}.report-footer{margin-top:2rem;text-align:center}@media print{.header,.report-header button,.report-footer{display:none!important}.report-content{box-shadow:none;border:none}body{background:#fff;color:#000}}.modal-overlay{position:fixed;inset:0;background-color:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease-out}.modal{background-color:var(--color-surface);width:90%;max-width:600px;max-height:80vh;border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);display:flex;flex-direction:column;overflow:hidden;animation:slideUp .3s ease-out}.modal-lg{max-width:800px}.modal-header{padding:1.5rem;border-bottom:1px solid var(--color-border);display:flex;justify-content:space-between;align-items:center}.modal-title{margin:0;font-size:1.25rem;font-weight:700}.modal-close{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--color-text-muted);padding:0;line-height:1;transition:color var(--transition-fast)}.modal-close:hover{color:var(--color-text-main)}.modal-body{padding:1.5rem;overflow-y:auto;flex:1}.modal-footer{padding:1rem 1.5rem;border-top:1px solid var(--color-border);display:flex;justify-content:flex-end;gap:.75rem}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .5s ease-out forwards}.history-empty{text-align:center;color:var(--color-text-muted);padding:2rem}.history-list{display:flex;flex-direction:column;gap:1rem}.history-item{padding:1rem;border:1px solid var(--color-border);border-radius:var(--radius-md);background-color:var(--color-surface);transition:all var(--transition-fast)}.history-item:hover{border-color:var(--color-primary);box-shadow:var(--shadow-sm)}.history-item-header{display:flex;justify-content:space-between;margin-bottom:.5rem;align-items:center}.history-item-date{font-size:.85rem;color:var(--color-text-muted)}.history-item-actions{display:flex;gap:.5rem}.history-item-preview{margin:0;font-size:.95rem;color:var(--color-text-main);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.settings-section{margin-bottom:2rem}.settings-section:last-child{margin-bottom:0}.settings-section-title{font-size:1rem;font-weight:600;margin:0 0 1rem;color:var(--color-text-main);display:flex;align-items:center;gap:.5rem}.settings-section-title:before{content:"";display:block;width:4px;height:1rem;background:linear-gradient(to bottom,var(--color-primary),var(--color-accent));border-radius:2px}.form-group{margin-bottom:1rem}.form-label{display:block;font-size:.9rem;font-weight:500;margin-bottom:.5rem;color:var(--color-text-main)}.form-hint{font-size:.8rem;color:var(--color-text-muted);margin-top:.25rem}.form-input,.form-select{width:100%;padding:.625rem .875rem;border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:.9rem;font-family:inherit;background-color:var(--color-surface);color:var(--color-text-main);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus,.form-select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.form-input::placeholder{color:var(--color-text-muted)}.form-checkbox-group{display:flex;align-items:center;gap:.5rem}.form-checkbox{width:1rem;height:1rem;accent-color:var(--color-primary)}.form-checkbox-label{font-size:.9rem;color:var(--color-text-main)}.provider-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.75rem;margin-bottom:1rem}.provider-card{padding:.75rem;border:2px solid var(--color-border);border-radius:var(--radius-md);text-align:center;cursor:pointer;transition:all var(--transition-fast);background-color:var(--color-surface)}.provider-card:hover{border-color:var(--color-primary-light);background-color:var(--color-surface-hover)}.provider-card.active{border-color:var(--color-primary);background-color:var(--color-primary-light)}.provider-card-name{font-size:.85rem;font-weight:500;color:var(--color-text-main)}.toggle-switch{position:relative;width:48px;height:24px;background-color:var(--color-border);border-radius:12px;cursor:pointer;transition:background-color var(--transition-fast)}.toggle-switch.active{background-color:var(--color-primary)}.toggle-switch:after{content:"";position:absolute;top:2px;left:2px;width:20px;height:20px;background-color:#fff;border-radius:50%;transition:transform var(--transition-fast);box-shadow:var(--shadow-sm)}.toggle-switch.active:after{transform:translate(24px)}.theme-toggle{background:var(--color-surface-hover);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.1rem;transition:all var(--transition-fast)}.theme-toggle:hover{background:var(--color-surface);border-color:var(--color-primary)}@media(max-width:640px){.header-container{height:auto;padding:.75rem 0;flex-direction:column;gap:.75rem}.header-actions{width:100%;justify-content:center;flex-wrap:wrap}.review-header{flex-direction:column;align-items:flex-start}.review-actions{width:100%}.review-actions .btn{flex:1}.report-content{padding:1.5rem}}