:root{--primary:#6366f1;--primary-light:#818cf8;--primary-dark:#4f46e5;--bg:#f8f9fc;--bg-card:#fff;--bg-input:#f1f3f9;--text-main:#1e1e2e;--text-muted:#64748b;--text-light:#94a3b8;--border:#e2e8f0;--border-focus:#6366f1;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--radius:12px;--radius-sm:8px;--shadow:0 2px 16px #6366f114;--shadow-hover:0 8px 32px #6366f12e;--transition:.22s cubic-bezier(.4, 0, .2, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text-main);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:Inter,system-ui,sans-serif;line-height:1.6}.app-shell{min-height:100vh;display:flex}.sidebar{border-right:1px solid var(--border);z-index:100;background:#fff;flex-direction:column;flex-shrink:0;width:260px;display:flex;position:fixed;top:0;bottom:0;left:0;overflow-y:auto}.sidebar-brand{border-bottom:1px solid var(--border);padding:24px 20px 16px}.sidebar-brand h1{background:linear-gradient(135deg, var(--primary), #a855f7);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.25rem;font-weight:800}.sidebar-brand p{color:var(--text-muted);margin-top:2px;font-size:.72rem}.sidebar-nav{flex:1;padding:12px 10px}.nav-section-title{text-transform:uppercase;letter-spacing:.08em;color:var(--text-light);padding:8px 10px 4px;font-size:.65rem;font-weight:700}.nav-item{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-muted);transition:var(--transition);text-align:left;background:0 0;border:none;align-items:center;gap:10px;width:100%;padding:9px 12px;font-size:.845rem;font-weight:500;text-decoration:none;display:flex}.nav-item:hover{background:var(--bg-input);color:var(--text-main)}.nav-item.active{color:var(--primary-dark);background:linear-gradient(135deg,#ede9fe,#e0e7ff);font-weight:600}.nav-item .nav-icon{flex-shrink:0;font-size:1rem}.nav-item .nav-stars{color:var(--warning);letter-spacing:-2px;margin-left:auto;font-size:.6rem}.main-content{flex:1;min-height:100vh;margin-left:260px;padding:32px}.topbar{justify-content:space-between;align-items:center;margin-bottom:28px;display:flex}.topbar-title h2{color:var(--text-main);font-size:1.5rem;font-weight:800}.topbar-title p{color:var(--text-muted);margin-top:2px;font-size:.85rem}.api-badge{color:var(--success);background:#ecfdf5;border:1px solid #6ee7b7;border-radius:999px;align-items:center;gap:6px;padding:6px 14px;font-size:.78rem;font-weight:600;display:flex}.api-badge .dot{background:var(--success);border-radius:50%;width:7px;height:7px;animation:2s infinite pulse}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.tools-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;display:grid}.tool-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:var(--transition);padding:24px;position:relative;overflow:hidden}.tool-card:before{content:"";background:var(--card-accent,linear-gradient(90deg, var(--primary), #a855f7));opacity:0;height:3px;transition:var(--transition);position:absolute;top:0;left:0;right:0}.tool-card:hover{box-shadow:var(--shadow-hover);border-color:var(--primary-light);transform:translateY(-4px)}.tool-card:hover:before{opacity:1}.tool-card-icon{margin-bottom:14px;font-size:2rem;display:block}.tool-card-title{color:var(--text-main);margin-bottom:6px;font-size:1rem;font-weight:700}.tool-card-desc{color:var(--text-muted);font-size:.82rem;line-height:1.5}.tool-card-stars{color:var(--warning);margin-top:14px;font-size:.72rem}.tool-page{max-width:820px;margin:0 auto}.tool-page-header{align-items:center;gap:16px;margin-bottom:28px;display:flex}.tool-page-header .tool-icon-lg{border-radius:var(--radius);background:linear-gradient(135deg,#ede9fe,#e0e7ff);flex-shrink:0;justify-content:center;align-items:center;width:64px;height:64px;font-size:2.5rem;display:flex}.tool-page-header h2{font-size:1.6rem;font-weight:800}.tool-page-header p{color:var(--text-muted);margin-top:4px;font-size:.875rem}.back-btn{color:var(--text-muted);cursor:pointer;transition:var(--transition);background:0 0;border:none;align-items:center;gap:6px;margin-bottom:20px;padding:6px 0;font-size:.85rem;font-weight:500;display:flex}.back-btn:hover{color:var(--primary)}.input-label{color:var(--text-main);margin-bottom:6px;font-size:.82rem;font-weight:600;display:block}.text-input,.textarea-input,.select-input{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-main);transition:var(--transition);outline:none;padding:11px 14px;font-family:inherit;font-size:.9rem}.text-input:focus,.textarea-input:focus,.select-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #6366f11f}.textarea-input{resize:vertical;min-height:120px}.btn{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);border:none;align-items:center;gap:8px;padding:11px 22px;font-family:inherit;font-size:.9rem;font-weight:600;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary), #7c3aed);color:#fff;box-shadow:0 2px 12px #6366f140}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 20px #6366f166}.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-secondary{background:var(--bg-input);color:var(--text-main);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.btn-danger{color:var(--danger);background:#fef2f2;border:1px solid #fecaca}.btn-danger:hover{background:#fee2e2}.output-box{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-top:20px;padding:24px}.output-box h4{text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted);align-items:center;gap:6px;margin-bottom:14px;font-size:.82rem;font-weight:700;display:flex}.output-content{color:var(--text-main);font-size:.9rem;line-height:1.75}.output-content p{margin-bottom:10px}.output-content ul,.output-content ol{margin-bottom:10px;padding-left:20px}.output-content h1,.output-content h2,.output-content h3{margin:16px 0 8px;font-weight:700}.output-content code{background:var(--bg-input);border-radius:4px;padding:2px 6px;font-family:Fira Code,monospace;font-size:.85em}.output-content pre{color:#cdd6f4;border-radius:var(--radius-sm);background:#1e1e2e;margin:12px 0;padding:16px;overflow-x:auto}.output-content pre code{color:inherit;background:0 0;padding:0}.dropzone-area{border:2px dashed var(--border);border-radius:var(--radius);text-align:center;cursor:pointer;transition:var(--transition);background:var(--bg-input);padding:36px}.dropzone-area:hover,.dropzone-area.active{border-color:var(--primary);background:#ede9fe22}.dropzone-area .dz-icon{margin-bottom:10px;font-size:2.5rem}.dropzone-area p{color:var(--text-muted);font-size:.88rem}.dropzone-area strong{color:var(--primary)}.chat-messages{background:var(--bg-input);border-radius:var(--radius);scroll-behavior:smooth;flex-direction:column;gap:12px;height:380px;margin-bottom:14px;padding:16px;display:flex;overflow-y:auto}.chat-bubble{border-radius:var(--radius);max-width:80%;padding:12px 16px;font-size:.875rem;line-height:1.6;animation:.2s fadeUp}.chat-bubble.user{background:linear-gradient(135deg, var(--primary), #7c3aed);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.chat-bubble.ai{color:var(--text-main);border:1px solid var(--border);background:#fff;border-bottom-left-radius:4px;align-self:flex-start}.chat-input-row{gap:10px;display:flex}.chat-input-row .text-input{flex:1}@keyframes fadeUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.spinner{border:2px solid #fff6;border-top-color:#fff;border-radius:50%;width:18px;height:18px;animation:.7s linear infinite spin;display:inline-block}.spinner.dark{border-color:#6366f133;border-top-color:var(--primary)}@keyframes spin{to{transform:rotate(360deg)}}.typing-dots span{background:var(--text-light);border-radius:50%;width:6px;height:6px;margin:0 2px;animation:1.2s infinite blink;display:inline-block}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.6;transform:scale(1)}40%{opacity:1;transform:scale(1.3)}}.quiz-question{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px;padding:20px}.quiz-question h4{margin-bottom:12px;font-size:.95rem;font-weight:700}.quiz-options{flex-direction:column;gap:8px;display:flex}.quiz-option{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);background:var(--bg-input);align-items:center;gap:10px;padding:10px 14px;font-size:.875rem;display:flex}.quiz-option:hover{border-color:var(--primary);background:#ede9fe22}.quiz-option.selected{border-color:var(--primary);color:var(--primary-dark);background:#ede9fe;font-weight:600;box-shadow:0 0 0 2px #6366f133}.quiz-option.correct{border-color:var(--success);color:#065f46;background:#d1fae5}.quiz-option.incorrect{border-color:var(--danger);color:#991b1b;background:#fee2e2}.quiz-score{text-align:center;border-radius:var(--radius);background:linear-gradient(135deg,#ede9fe,#e0e7ff);margin-top:16px;padding:24px}.quiz-score h3{color:var(--primary-dark);font-size:2rem;font-weight:800}.quiz-score p{color:var(--text-muted);margin-top:6px}.recorder-btn{cursor:pointer;width:72px;height:72px;transition:var(--transition);border:none;border-radius:50%;justify-content:center;align-items:center;margin:0 auto;font-size:1.8rem;display:flex}.recorder-btn.idle{background:linear-gradient(135deg, var(--primary), #7c3aed);box-shadow:0 4px 24px #6366f159}.recorder-btn.recording{background:linear-gradient(135deg, var(--danger), #dc2626);animation:1.5s infinite recordPulse;box-shadow:0 4px 24px #ef444473}@keyframes recordPulse{0%,to{box-shadow:0 4px 24px #ef444473}50%{box-shadow:0 4px 40px #ef4444bf}}.generated-image{border-radius:var(--radius);border:1px solid var(--border);width:100%;margin-top:16px}.chip{background:var(--bg-input);color:var(--text-muted);border:1px solid var(--border);border-radius:999px;align-items:center;gap:4px;padding:4px 10px;font-size:.75rem;font-weight:600;display:inline-flex}.chip.primary{color:var(--primary-dark);background:#ede9fe;border-color:#c4b5fd}.form-group{margin-bottom:18px}.row{gap:14px;display:flex}.row .form-group{flex:1}.divider{border:none;border-top:1px solid var(--border);margin:20px 0}.alert{border-radius:var(--radius-sm);align-items:center;gap:8px;margin-bottom:16px;padding:12px 16px;font-size:.85rem;font-weight:500;display:flex}.alert-info{color:#3730a3;background:#e0e7ff;border:1px solid #c7d2fe}.alert-success{color:#065f46;background:#d1fae5;border:1px solid #6ee7b7}.alert-warn{color:#92400e;background:#fef3c7;border:1px solid #fcd34d}.alert-error{color:#991b1b;background:#fee2e2;border:1px solid #fca5a5}.progress-bar{background:var(--bg-input);border-radius:999px;width:100%;height:6px;margin:8px 0;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary), #a855f7);border-radius:999px;height:100%;transition:width .5s}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-light)}.home-hero{background:linear-gradient(135deg,#f8f7ff 0%,#ede9fe 50%,#e0e7ff 100%);border:1px solid #c4b5fd44;border-radius:20px;margin-bottom:32px;padding:40px 36px;position:relative;overflow:hidden}.home-hero:before{content:"";background:radial-gradient(circle,#a855f71f,#0000 70%);border-radius:50%;width:200px;height:200px;position:absolute;top:-40px;right:-40px}.home-hero h2{background:linear-gradient(135deg, var(--primary-dark), #7c3aed, #a855f7);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:10px;font-size:2rem;font-weight:900}.home-hero p{color:var(--text-muted);max-width:560px;font-size:1rem;line-height:1.7}.home-hero-stats{gap:28px;margin-top:24px;display:flex}.stat-item strong{color:var(--primary-dark);font-size:1.5rem;font-weight:800;display:block}.stat-item span{color:var(--text-muted);font-size:.78rem;font-weight:500}@media (width<=900px){.sidebar{width:220px}.main-content{margin-left:220px;padding:20px}}@media (width<=640px){.sidebar{display:none}.main-content{margin-left:0}.tools-grid{grid-template-columns:1fr}}.output-content table{border-collapse:collapse;width:100%;margin:16px 0;font-size:.9rem}.output-content th,.output-content td{border:1px solid var(--border);text-align:left;padding:12px 16px}.output-content th{background-color:var(--bg-input);color:var(--text-main);font-weight:600}.output-content tr:nth-child(2n){background-color:#6366f105}.output-content tr:hover{background-color:#6366f10a}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background-color:#0f172a66;justify-content:center;align-items:center;animation:.2s ease-out fadeIn;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg-card);border-radius:var(--radius);width:90%;max-width:600px;max-height:85vh;box-shadow:var(--shadow-hover);border:1px solid var(--border);animation:.3s cubic-bezier(.16,1,.3,1) slideUp;position:relative;overflow-y:auto}.modal-header{border-bottom:1px solid var(--border);background:var(--bg-card);z-index:10;justify-content:space-between;align-items:center;padding:20px 24px;display:flex;position:sticky;top:0}.modal-header h3{color:var(--text-main);align-items:center;gap:8px;margin:0;font-size:1.25rem;font-weight:700;display:flex}.modal-close-btn{color:var(--text-muted);cursor:pointer;transition:var(--transition);background:0 0;border:none;border-radius:4px;padding:4px;font-size:1.5rem;line-height:1}.modal-close-btn:hover{background:var(--bg-input);color:var(--text-main)}.modal-body{padding:24px}.help-item{border-bottom:1px solid var(--border);margin-bottom:24px;padding-bottom:24px}.help-item:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.help-item h4{align-items:center;gap:8px;margin-bottom:8px;font-size:1.05rem;font-weight:700;display:flex}.help-desc{color:var(--text-muted);margin-bottom:12px;font-size:.9rem;line-height:1.5}.help-example{background:var(--bg-input);border-radius:var(--radius-sm);border-left:3px solid var(--primary);padding:12px 16px}.help-example-label{text-transform:uppercase;color:var(--primary-dark);letter-spacing:.05em;margin-bottom:4px;font-size:.75rem;font-weight:700}.help-example-text{color:var(--text-main);white-space:pre-wrap;font-family:Fira Code,monospace;font-size:.85rem}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}