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var(--transition-fast)}.nav-item:hover{background-color:#0000000d}.nav-item.active{background-color:#00000014}.nav-item.new-chat{font-weight:500}.nav-icon{font-size:var(--text-base);width:20px;text-align:center}.nav-label{flex:1}.sidebar-recents{margin-top:var(--space-2);border-top:1px solid var(--color-border);padding-top:var(--space-2)}.recents-header{font-size:var(--text-xs);font-weight:500;color:var(--color-text-tertiary);padding:var(--space-2) var(--space-3)}.recents-list{display:flex;flex-direction:column;gap:0}.recent-item{display:flex;align-items:center;padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);cursor:pointer;transition:background-color 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var(--transition-fast);height:140px;max-height:140px;position:relative;overflow:hidden}.project-card:hover{background-color:var(--color-cream-200)}.project-card-content{flex:1;display:flex;flex-direction:column}.project-card-name{font-size:var(--text-base);font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.project-card-edit{width:100%;padding:var(--space-2);border:1px solid var(--color-accent);border-radius:var(--radius-md);font-size:var(--text-base);font-weight:600;background:var(--color-bg-primary)}.project-card-time{font-size:var(--text-sm);color:var(--color-text-tertiary);margin-top:auto;padding-top:var(--space-4)}.project-card-actions{position:absolute;top:var(--space-3);right:var(--space-3);display:flex;gap:var(--space-1);opacity:0;transition:opacity var(--transition-fast)}.project-card:hover .project-card-actions{opacity:1}.project-card-action{padding:var(--space-1);border-radius:var(--radius-sm);font-size:var(--text-xs);transition:background-color var(--transition-fast)}.project-card-action:hover{background-color:#0000001a}.project-card-action.delete:hover{background-color:var(--color-red-100)}.no-projects{grid-column:1 / -1;text-align:center;padding:var(--space-12);color:var(--color-text-secondary)}.no-projects .hint{font-size:var(--text-sm);color:var(--color-text-tertiary);margin-top:var(--space-2)}@media (max-width: 800px){.projects-grid{grid-template-columns:1fr;max-width:none}}.project-page{display:flex;flex:1;width:100%;height:100%;background-color:var(--color-bg-primary)}.project-main{flex:1;display:flex;flex-direction:column;padding:var(--space-6);overflow-y:auto}.project-nav{margin-bottom:var(--space-4)}.back-link{color:var(--color-text-secondary);font-size:var(--text-sm);transition:color var(--transition-fast)}.back-link:hover{color:var(--color-text-primary)}.project-title{font-size:var(--text-2xl);font-weight:600;margin-bottom:var(--space-6)}.project-input-container{margin-bottom:var(--space-6)}.project-sessions{flex:1}.no-sessions{text-align:center;padding:var(--space-8);color:var(--color-text-tertiary);font-size:var(--text-sm)}.session-row{padding:var(--space-4) 0;border-bottom:1px solid var(--color-border);cursor:pointer;transition:background-color var(--transition-fast)}.session-row:hover{background-color:var(--color-bg-secondary);margin:0 calc(-1 * var(--space-4));padding:var(--space-4)}.session-row-title{font-weight:600;font-size:var(--text-base);margin-bottom:var(--space-1)}.session-row-meta{font-size:var(--text-sm);color:var(--color-text-tertiary)}.project-sidebar{width:320px;min-width:320px;border-left:1px solid var(--color-border);background-color:var(--color-bg-secondary);overflow-y:auto;flex-shrink:0;margin-left:auto}.sidebar-section{border-bottom:1px solid var(--color-border)}.sidebar-section-header{display:flex;justify-content:space-between;align-items:center;width:100%;padding:var(--space-4);font-weight:600;font-size:var(--text-sm);color:var(--color-text-primary);text-align:left;transition:background-color var(--transition-fast)}.sidebar-section-header:hover{background-color:var(--color-bg-tertiary)}.expand-icon{color:var(--color-text-tertiary);font-weight:400}.sidebar-section-content{padding:var(--space-3)}.sidebar-section-content .instructions-textarea,.sidebar-section-content .file-dropzone{width:100%;box-sizing:border-box}.instructions-textarea{width:100%;padding:var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--text-sm);font-family:var(--font-sans);background-color:var(--color-bg-primary);resize:vertical;line-height:var(--leading-normal)}.instructions-textarea:focus{outline:none;border-color:var(--color-border-focus)}.instructions-textarea::placeholder{color:var(--color-text-tertiary)}.project-sidebar .file-dropzone{border:2px dashed var(--color-border);border-radius:var(--radius-md);padding:var(--space-4);text-align:center;cursor:pointer;transition:all var(--transition-fast);margin-bottom:var(--space-3)}.project-sidebar .file-dropzone:hover,.project-sidebar .file-dropzone.active{border-color:var(--color-accent);background-color:var(--color-bg-primary)}.project-sidebar .file-dropzone p{color:var(--color-text-secondary);font-size:var(--text-sm);margin:0}.project-sidebar .file-list{display:flex;flex-direction:column;gap:var(--space-2)}.project-sidebar .file-item{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2);background-color:var(--color-bg-primary);border-radius:var(--radius-md)}.project-sidebar .file-icon{font-size:var(--text-base);flex-shrink:0}.project-sidebar .file-info{flex:1;min-width:0}.project-sidebar .file-name{display:block;font-size:var(--text-xs);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.project-sidebar .file-meta{font-size:var(--text-xs);color:var(--color-text-tertiary)}.project-sidebar .file-remove{padding:var(--space-1);color:var(--color-text-tertiary);font-size:var(--text-sm);opacity:0;transition:opacity var(--transition-fast),color var(--transition-fast)}.project-sidebar .file-item:hover .file-remove{opacity:1}.project-sidebar .file-remove:hover{color:var(--color-red-500)}.project-page-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:var(--space-4);color:var(--color-text-secondary)}.project-page-empty button{color:var(--color-accent)}@media (max-width: 900px){.project-sidebar{display:none}.project-main{max-width:none}}.login-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.login-card{background:#fff;padding:3rem;border-radius:16px;box-shadow:0 20px 60px #0003;text-align:center;max-width:400px;width:90%}.login-logo{font-size:4rem;margin-bottom:1rem}.login-card h1{margin:0 0 .5rem;font-size:2rem;color:#1a1a2e}.login-card>p{color:#666;margin:0 0 2rem}.login-button{display:inline-flex;align-items:center;gap:12px;padding:14px 28px;font-size:1rem;font-weight:500;color:#333;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;transition:all .2s}.login-button:hover{border-color:#4285f4;box-shadow:0 4px 12px #4285f433}.login-button svg{flex-shrink:0}.login-note{margin-top:1.5rem;font-size:.85rem;color:#888}.app-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background:#f8f9fa}.loading-spinner{width:40px;height:40px;border:3px solid #e0e0e0;border-top-color:#667eea;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.app-loading p{margin-top:1rem;color:#666}.user-bar{display:flex;align-items:center;justify-content:flex-end;gap:1rem;padding:.5rem 1rem;background:#f8f9fa;border-bottom:1px solid #e0e0e0;font-size:.9rem}.user-email{color:#666}.logout-btn{padding:6px 12px;font-size:.85rem;color:#666;background:#fff;border:1px solid #ddd;border-radius:4px;cursor:pointer;transition:all .2s}.logout-btn:hover{color:#333;border-color:#999}:root{--color-white: #ffffff;--color-black: #000000;--color-gray-50: #f9fafb;--color-gray-100: #f3f4f6;--color-gray-200: #e5e7eb;--color-gray-300: #d1d5db;--color-gray-400: #9ca3af;--color-gray-500: #6b7280;--color-gray-600: #4b5563;--color-gray-700: #374151;--color-gray-800: #1f2937;--color-gray-900: #111827;--color-blue-50: #eff6ff;--color-blue-100: #dbeafe;--color-blue-500: #3b82f6;--color-blue-600: #2563eb;--color-blue-700: #1d4ed8;--color-green-50: #f0fdf4;--color-green-500: #22c55e;--color-green-600: #16a34a;--color-red-50: #fef2f2;--color-red-100: #fee2e2;--color-red-500: #ef4444;--color-red-600: #dc2626;--color-cream-50: #faf9f7;--color-cream-100: #f5f3ef;--color-cream-200: #ebe7e0;--color-bg-primary: var(--color-white);--color-bg-secondary: var(--color-gray-50);--color-bg-tertiary: var(--color-gray-100);--color-bg-sidebar: var(--color-gray-900);--color-text-primary: var(--color-gray-900);--color-text-secondary: var(--color-gray-600);--color-text-tertiary: var(--color-gray-400);--color-text-inverse: var(--color-white);--color-border: var(--color-gray-200);--color-border-hover: var(--color-gray-300);--color-border-focus: var(--color-blue-500);--color-accent: var(--color-blue-600);--color-accent-hover: var(--color-blue-700);--color-success: var(--color-green-500);--color-error: var(--color-red-500);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--leading-tight: 1.25;--leading-normal: 1.5;--leading-relaxed: 1.625;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--radius-sm: .25rem;--radius-md: .375rem;--radius-lg: .5rem;--radius-xl: .75rem;--radius-full: 9999px;--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);--transition-fast: .15s ease;--transition-normal: .2s ease;--transition-slow: .3s ease;--sidebar-width: 280px;--sidebar-collapsed-width: 60px;--header-height: 56px;--input-height: 120px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{width:100%;height:100%;margin:0;padding:0;font-family:var(--font-sans);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text-primary);background-color:var(--color-bg-secondary)}.app{display:flex;width:100vw;height:100vh;overflow:hidden}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.main-content>*{width:100%}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--color-bg-secondary)}::-webkit-scrollbar-thumb{background:var(--color-gray-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-gray-400)}button{font-family:inherit;font-size:inherit;border:none;background:none;cursor:pointer}input,textarea{font-family:inherit;font-size:inherit;border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);outline:none;transition:border-color var(--transition-fast)}input:focus,textarea:focus{border-color:var(--color-border-focus)}.welcome-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:var(--space-8)}.welcome-icon{font-size:4rem;margin-bottom:var(--space-4)}.welcome-screen h2{font-size:var(--text-2xl);margin-bottom:var(--space-2)}.welcome-screen p{color:var(--color-text-secondary);margin-bottom:var(--space-2)}.welcome-hint{font-size:var(--text-sm);color:var(--color-text-tertiary)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}