:root{--bg-page:#f8fafc;--bg-card:#fff;--bg-card-hover:#f8fafc;--bg-elevated:#f1f5f9;--bg-subtle:#edf2f7;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--text-inverse:#fff;--primary:#4f46e5;--primary-hover:#4338ca;--primary-light:#eef2ff;--primary-border:#c7d2fe;--accent:#0ea5e9;--accent-light:#e0f2fe;--saffron:#f59e0b;--saffron-light:#fef3c7;--success:#10b981;--success-light:#d1fae5;--warning:#f59e0b;--warning-light:#fef3c7;--error:#ef4444;--error-light:#fee2e2;--border:#e2e8f0;--border-focus:#818cf8;--gradient-primary:linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);--gradient-saffron:linear-gradient(135deg, #f59e0b 0%, #d97706 100%);--gradient-card:linear-gradient(180deg, #fff 0%, #f8fafc 100%);--gradient-hero:linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #f59e0b15 100%);--shadow-sm:0 1px 3px #0f172a0d;--shadow-md:0 4px 12px -2px #0f172a14;--shadow-lg:0 12px 28px -6px #0f172a1f;--shadow-glow:0 10px 30px -5px #4f46e540;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-full:9999px;--font-heading:"Outfit", -apple-system, sans-serif;--font-body:"Plus Jakarta Sans", -apple-system, sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:var(--bg-page);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;line-height:1.6}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-primary);font-weight:700;line-height:1.25}.app-container{flex-direction:column;min-height:100vh;display:flex}.main-content{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:24px}.navbar{-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);z-index:100;background:#ffffffd9;padding:12px 24px;position:sticky;top:0}.navbar-inner{justify-content:space-between;align-items:center;max-width:1400px;margin:0 auto;display:flex}.brand{cursor:pointer;align-items:center;gap:12px;text-decoration:none;display:flex}.brand-icon{background:var(--gradient-primary);border-radius:var(--radius-md);color:#fff;width:42px;height:42px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;font-size:22px;display:flex}.brand-title{background:var(--gradient-primary);-webkit-text-fill-color:transparent;letter-spacing:-.5px;-webkit-background-clip:text;font-size:20px;font-weight:800}.nav-links{align-items:center;gap:8px;display:flex}.nav-link{border-radius:var(--radius-full);color:var(--text-secondary);align-items:center;gap:8px;padding:10px 16px;font-size:14px;font-weight:600;text-decoration:none;transition:all .2s;display:flex}.nav-link:hover{color:var(--primary);background:var(--primary-light)}.nav-link.active{color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 1px var(--primary-border)}.nav-user-badge{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-full);align-items:center;gap:12px;padding:6px 14px 6px 6px;display:flex}.user-avatar-circle{background:var(--gradient-saffron);border-radius:var(--radius-full);color:#fff;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;font-weight:700;display:flex}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:24px;transition:transform .2s,box-shadow .2s}.card-hover:hover{box-shadow:var(--shadow-md);border-color:var(--primary-border);transform:translateY(-2px)}.hero-banner{background:var(--gradient-hero);border:1px solid var(--primary-border);border-radius:var(--radius-lg);justify-content:space-between;align-items:center;gap:24px;margin-bottom:24px;padding:32px;display:flex}.btn{font-size:14px;font-weight:600;font-family:var(--font-body);border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:10px 20px;text-decoration:none;transition:all .2s;display:inline-flex}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-glow)}.btn-primary:hover{opacity:.95;transform:translateY(-1px)}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-elevated);border-color:var(--text-muted)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{background:var(--bg-elevated);color:var(--text-primary)}.btn-icon{border-radius:var(--radius-full);border:1px solid var(--border);background:var(--bg-card);width:40px;height:40px;color:var(--text-secondary);cursor:pointer;justify-content:center;align-items:center;padding:0;transition:all .2s;display:flex}.btn-icon:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary-border)}.input-group{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.input-label{color:var(--text-secondary);font-size:13px;font-weight:600}.input{border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-card);width:100%;color:var(--text-primary);font-family:var(--font-body);padding:12px 16px;font-size:14px;transition:all .2s}.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light);outline:none}.studio-layout{grid-template-columns:1fr 340px;gap:24px;height:calc(100vh - 140px);display:grid}@media (width<=1024px){.studio-layout{grid-template-columns:1fr;height:auto}}.chat-container{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);flex-direction:column;display:flex;overflow:hidden}.chat-header{border-bottom:1px solid var(--border);background:var(--bg-card);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.tutor-avatar-container{align-items:center;gap:12px;display:flex}.tutor-avatar-circle{border-radius:var(--radius-full);background:var(--gradient-primary);justify-content:center;align-items:center;width:48px;height:48px;font-size:24px;display:flex;position:relative}.pulse-ring{border-radius:var(--radius-full);border:2px solid var(--primary);animation:2s cubic-bezier(.4,0,.6,1) infinite pulse;position:absolute;inset:-4px}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(1.1)}}.chat-body{background:#fafafa;flex-direction:column;flex:1;gap:16px;padding:24px;display:flex;overflow-y:auto}.msg-bubble{border-radius:var(--radius-md);max-width:80%;box-shadow:var(--shadow-sm);padding:14px 18px;font-size:15px;line-height:1.5;position:relative}.msg-user{background:var(--gradient-primary);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.msg-assistant{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border);border-bottom-left-radius:4px;align-self:flex-start}.feedback-box{background:var(--saffron-light);border-radius:var(--radius-sm);color:#92400e;border:1px solid #fde68a;margin-top:8px;padding:10px 14px;font-size:13px}.feedback-tag{border-radius:var(--radius-full);align-items:center;gap:6px;margin-top:6px;padding:4px 10px;font-size:12px;font-weight:600;display:inline-flex}.tag-grammar{background:var(--error-light);color:var(--error)}.tag-vocabulary{background:var(--accent-light);color:var(--accent)}.tag-praise{background:var(--success-light);color:var(--success)}.chat-input-bar{border-top:1px solid var(--border);background:var(--bg-card);align-items:center;gap:12px;padding:16px 24px;display:flex}.chat-input-field{border:1px solid var(--border);border-radius:var(--radius-full);background:var(--bg-elevated);outline:none;flex:1;padding:12px 16px;font-size:14px}.chat-input-field:focus{border-color:var(--primary);background:var(--bg-card)}.tiles-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-bottom:24px;display:grid}.tile{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);align-items:center;gap:16px;padding:20px;display:flex}.tile-icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:52px;height:52px;font-size:24px;display:flex}.animate-fade{animation:.3s ease-in-out fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}