.MainLayout_mainLayout__aJxpe{min-height:100vh;display:flex;flex-direction:column;background-color:#fff}.MainLayout_mainLayout__header__aKziK{background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;padding:1.5rem 0;box-shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);position:relative;overflow:hidden}.MainLayout_mainLayout__header__aKziK:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');opacity:.3}.MainLayout_mainLayout__nav__Uosdc{max-width:1200px;margin:0 auto;padding:0 1.5rem;display:flex;justify-content:space-between;align-items:center;position:relative;z-index:1}.MainLayout_mainLayout__logo__XNues{display:flex;align-items:center;gap:1rem;text-decoration:none;color:#fff}.MainLayout_mainLayout__logoIcon__uphcl{font-size:2rem}.MainLayout_mainLayout__logoText__FyBYm{font-size:1.5rem;font-weight:700;margin:0}.MainLayout_mainLayout__logoSubtitle__G4zLa{font-size:.875rem;opacity:.9;margin:0}.MainLayout_mainLayout__navLinks__SbOgV{display:flex;gap:1.5rem;align-items:center}.MainLayout_mainLayout__navLink__ZUwkp{color:hsla(0,0%,100%,.9);text-decoration:none;padding:.5rem 1rem;border-radius:.375rem;font-weight:500;transition:all .15s ease}.MainLayout_mainLayout__navLink__ZUwkp:hover{background:hsla(0,0%,100%,.15);color:#fff;transform:translateY(-1px)}.MainLayout_mainLayout__navLink--active__AxZnF{background:hsla(0,0%,100%,.2);color:#fff}.MainLayout_mainLayout__userSection__4undN{display:flex;align-items:center;gap:1rem}.MainLayout_mainLayout__userInfo__bAkvh{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;border-radius:.375rem;background:hsla(0,0%,100%,.1)}.MainLayout_mainLayout__userInfoAvatar__SHEIZ{width:32px;height:32px;border-radius:50rem;background:hsla(0,0%,100%,.2);display:flex;align-items:center;justify-content:center;font-weight:600}.MainLayout_mainLayout__userInfoName__vF5eP{font-size:.875rem;font-weight:500}.MainLayout_mainLayout__main__VAtEy{flex:1 1;display:flex;flex-direction:column;max-width:1200px;margin:0 auto;width:100%;padding:2rem 1.5rem}.MainLayout_mainLayout__footer__hw8V6{background-color:#f3f4f6;border-top:1px solid #e5e7eb;padding:1.5rem 0;margin-top:auto}.MainLayout_mainLayout__footerContent__e_6tW{max-width:1200px;margin:0 auto;padding:0 1.5rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));grid-gap:1.5rem;gap:1.5rem}.MainLayout_mainLayout__footerSection__NeK_H h3{font-size:1rem;font-weight:600;color:#1f2937;margin-bottom:1rem}.MainLayout_mainLayout__footerSection__NeK_H li,.MainLayout_mainLayout__footerSection__NeK_H p{font-size:.875rem;color:#6b7280;margin-bottom:.5rem}.MainLayout_mainLayout__footerSection__NeK_H ul{list-style:none;padding:0}.MainLayout_mainLayout__footerSection__NeK_H a{color:#3b82f6;text-decoration:none}.MainLayout_mainLayout__footerSection__NeK_H a:hover{text-decoration:underline}@media(max-width:768px){.MainLayout_mainLayout__nav__Uosdc{flex-direction:column;gap:1rem;padding:1rem}.MainLayout_mainLayout__navLinks__SbOgV{flex-wrap:wrap;justify-content:center;gap:.5rem}.MainLayout_mainLayout__main__VAtEy{padding:1rem}.MainLayout_mainLayout__footerContent__e_6tW{grid-template-columns:1fr;text-align:center}}.MainLayout_btn__PYWjj{background:hsla(0,0%,100%,.2);border:none;color:#fff;padding:.5rem 1rem;border-radius:.375rem;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease;text-decoration:none;display:inline-flex;align-items:center;gap:.25rem}.MainLayout_btn__PYWjj:hover{background:hsla(0,0%,100%,.3);transform:translateY(-1px)}.MainLayout_btn--primary__LX4zc{background:#fff;color:#3b82f6}.MainLayout_btn--primary__LX4zc:hover{background:hsla(0,0%,100%,.9)}.MainLayout_btn--secondary__jgIfy{background:rgba(0,0,0,0);border:1px solid hsla(0,0%,100%,.3)}.MainLayout_btn--secondary__jgIfy:hover{border-color:hsla(0,0%,100%,.5)}:root{--primary:#3b82f6;--primary-dark:#2563eb;--primary-light:#60a5fa;--secondary:#8b5cf6;--secondary-dark:#7c3aed;--accent:#10b981;--difficulty-very-basic:#22c55e;--difficulty-basic:#84cc16;--difficulty-normal:#f59e0b;--difficulty-expert:#ef4444;--text-primary:#1f2937;--text-secondary:#6b7280;--text-muted:#9ca3af;--text-white:#ffffff;--text-light:#f8fafc;--bg-primary:#ffffff;--bg-secondary:#f9fafb;--bg-gray:#f3f4f6;--space-xs:0.25rem;--space-sm:0.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--font-size-xs:0.75rem;--font-size-sm:0.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-light:300;--font-normal:400;--font-medium:500;--font-semibold:600;--font-bold:700;--leading-tight:1.25;--leading-normal:1.5;--leading-relaxed:1.625;--radius-sm:0.25rem;--radius-md:0.375rem;--radius-lg:0.5rem;--radius-full:50rem;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);--transition-normal:0.25s ease;--transition-slow:0.35s ease}*{margin:0;padding:0}body,html{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6;color:#1f2937;background-color:#f9fafb}.container{max-width:1280px;margin:0 auto;padding:0 1rem}@media(min-width:768px){.container{padding:0 1.5rem}}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translateX(-20px)}to{opacity:1;transform:translateX(0)}}.math-content .katex{font-size:1.1em}.math-content .katex-display{margin:1rem 0;text-align:center}.prose{max-width:none}.prose p{margin-bottom:.5rem}.prose p:last-child{margin-bottom:0}.prose h1,.prose h2,.prose h3,.prose h4,.prose h5,.prose h6{margin-top:1.5rem;margin-bottom:1rem;font-weight:600}.prose h1:first-child,.prose h2:first-child,.prose h3:first-child,.prose h4:first-child,.prose h5:first-child,.prose h6:first-child{margin-top:0}.prose code{background-color:#f3f4f6;padding:2px 4px;border-radius:.25rem;font-family:Courier New,monospace;font-size:.875em}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f3f4f6}::-webkit-scrollbar-thumb{background:#9ca3af;border-radius:.375rem}::-webkit-scrollbar-thumb:hover{background:#6b7280}:root{--primary-50:#eff6ff;--primary-100:#dbeafe;--primary-200:#bfdbfe;--primary-300:#93c5fd;--primary-400:#60a5fa;--primary-500:#3b82f6;--primary-600:#2563eb;--primary-700:#1d4ed8;--primary-800:#1e40af;--primary-900:#1e3a8a;--success-50:#f0fdf4;--success-100:#dcfce7;--success-200:#bbf7d0;--success-300:#86efac;--success-400:#4ade80;--success-500:#22c55e;--success-600:#16a34a;--success-700:#15803d;--success-800:#166534;--warning-50:#fffbeb;--warning-100:#fef3c7;--warning-200:#fde68a;--warning-300:#fcd34d;--warning-400:#fbbf24;--warning-500:#f59e0b;--warning-600:#d97706;--error-50:#fef2f2;--error-100:#fee2e2;--error-200:#fecaca;--error-300:#fca5a5;--error-400:#f87171;--error-500:#ef4444;--error-600:#dc2626;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--font-primary:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--font-secondary:"Source Sans Pro",system-ui,-apple-system,sans-serif;--font-math:"KaTeX_Main","Computer Modern","Times New Roman",serif;--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.5s ease;--mobile:320px;--tablet:768px;--desktop:1024px;--wide:1200px}*{box-sizing:border-box}body{font-family:var(--font-secondary);color:var(--gray-900);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-family:var(--font-primary);font-weight:600;line-height:1.2;margin:0}.hero{min-height:100vh;background:linear-gradient(135deg,var(--primary-50) 0,var(--primary-100) 50%,var(--primary-200) 100%);display:flex;align-items:center;padding:var(--space-8) var(--space-6);position:relative;overflow:hidden}.hero:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%233b82f6' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;pointer-events:none}.hero__content{max-width:1200px;margin:0 auto;text-align:center;position:relative;z-index:1}.hero__title{font-size:clamp(2.5rem,6vw,4.5rem);font-weight:800;color:var(--gray-900);margin-bottom:var(--space-6);line-height:1.1;background:linear-gradient(135deg,var(--primary-600),var(--primary-800));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 2px 4px rgba(0,0,0,.1)}.hero__subtitle{font-size:clamp(1.125rem,2.5vw,1.375rem);color:var(--gray-700);max-width:700px;margin:0 auto var(--space-8);line-height:1.6;font-weight:400}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));grid-gap:var(--space-8);gap:var(--space-8);margin-top:var(--space-16)}.feature-card{background:rgba(255,255,255,.9);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);border-radius:16px;padding:var(--space-8);box-shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);transition:all var(--transition-normal);position:relative;overflow:hidden}.feature-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-500),var(--primary-600));transform:translateX(-100%);transition:transform var(--transition-normal)}.feature-card:hover{transform:translateY(-8px);box-shadow:0 20px 25px -5px rgba(0,0,0,.1),0 10px 10px -5px rgba(0,0,0,.04)}.feature-card:hover:before{transform:translateX(0)}.feature-card__icon{font-size:3rem;margin-bottom:var(--space-4);display:block;line-height:1}.feature-card__title{font-size:1.5rem;font-weight:700;color:var(--gray-900);margin-bottom:var(--space-3);font-family:var(--font-primary)}.feature-card__description{color:var(--gray-600);line-height:1.7;font-size:1rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-3) var(--space-6);border-radius:12px;font-size:1rem;font-weight:600;font-family:var(--font-primary);text-decoration:none;border:none;cursor:pointer;transition:all var(--transition-normal);position:relative;overflow:hidden;white-space:nowrap}.btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s}.btn:hover:before{left:100%}.btn--primary{background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:white;box-shadow:0 4px 14px 0 rgba(59,130,246,.39)}.btn--primary:hover:not(:disabled){background:linear-gradient(135deg,var(--primary-600),var(--primary-700));transform:translateY(-2px);box-shadow:0 8px 25px 0 rgba(59,130,246,.5)}.btn--secondary{background:rgba(255,255,255,.9);color:var(--gray-800);border:1px solid var(--gray-300);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.btn--secondary:hover:not(:disabled){background:white;transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.15)}.btn--large{padding:var(--space-4) var(--space-8);font-size:1.125rem}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none!important}.privacy-callout{background:linear-gradient(135deg,var(--success-50),rgba(220,252,231,.8));border:1px solid var(--success-200);border-left:4px solid var(--success-500);border-radius:16px;padding:var(--space-6);margin:var(--space-8) 0;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.privacy-callout__title{font-size:1.125rem;font-weight:700;color:var(--success-800);margin-bottom:var(--space-3);font-family:var(--font-primary)}.privacy-callout__title:before{content:"🛡️";margin-right:var(--space-2)}.privacy-callout__text{color:var(--success-700);line-height:1.6;font-size:1rem}.tutor-chat{max-width:900px;margin:0 auto;height:calc(100vh - 120px);display:flex;flex-direction:column;background:white;border-radius:16px;box-shadow:0 10px 25px -3px rgba(0,0,0,.1);overflow:hidden}.chat-header{background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:white;padding:var(--space-5) var(--space-6);position:relative}.chat-header:before{content:"";position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent)}.chat-header__title{font-size:1.375rem;font-weight:700;margin:0;font-family:var(--font-primary)}.chat-header__subtitle{font-size:.875rem;opacity:.9;margin:var(--space-1) 0 0;font-weight:400}.message{margin-bottom:var(--space-4);animation:fadeInUp var(--transition-normal) ease-out}.message--user{display:flex;justify-content:flex-end}.message--user .message__bubble{background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:white;border-radius:20px 20px 6px 20px;box-shadow:0 4px 12px rgba(59,130,246,.3)}.message--assistant{display:flex;justify-content:flex-start}.message--assistant .message__bubble{background:var(--gray-50);color:var(--gray-900);border-radius:20px 20px 20px 6px;border:1px solid var(--gray-200);box-shadow:0 2px 8px rgba(0,0,0,.06)}.message__bubble{max-width:75%;padding:var(--space-4) var(--space-5);font-size:1rem;line-height:1.6;word-wrap:break-word}.solution-steps{background:linear-gradient(135deg,#f0f9ff,rgba(224,242,254,.8));border:1px solid var(--primary-200);border-radius:16px;padding:var(--space-6);margin:var(--space-4) 0;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.step{display:flex;align-items:flex-start;margin-bottom:var(--space-4);animation:fadeInLeft var(--transition-normal) ease-out}.step:last-child{margin-bottom:0}.step__number{background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:white;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.875rem;margin-right:var(--space-4);flex-shrink:0;box-shadow:0 4px 8px rgba(59,130,246,.3)}.step__content{flex:1 1;padding-top:6px}.step__content .katex{font-size:1.1rem;line-height:1.8}.auth-container{min-height:100vh;background:linear-gradient(135deg,#fafbff 0,var(--primary-50) 100%);display:flex;align-items:center;justify-content:center;padding:var(--space-8) var(--space-4)}.auth-card{background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);border-radius:20px;box-shadow:0 20px 40px rgba(0,0,0,.1);padding:var(--space-10);width:100%;max-width:420px}.auth-card__header{text-align:center;margin-bottom:var(--space-8)}.auth-card__header h1{font-size:2.25rem;font-weight:800;color:var(--gray-900);margin-bottom:var(--space-2);background:linear-gradient(135deg,var(--primary-600),var(--primary-800));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.auth-card__header p{color:var(--gray-600);font-size:1rem;line-height:1.5}.form-field{margin-bottom:var(--space-6)}.form-field label{display:block;font-size:.875rem;font-weight:600;color:var(--gray-700);margin-bottom:var(--space-2);font-family:var(--font-primary)}.form-field input,.form-field select{width:100%;padding:var(--space-4);border:2px solid var(--gray-200);border-radius:12px;font-size:1rem;background:rgba(255,255,255,.9);transition:all var(--transition-normal);font-family:var(--font-secondary)}.form-field input:focus,.form-field select:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 4px rgba(59,130,246,.1);background:white}.loading-spinner{width:32px;height:32px;border-top:3px solid var(--gray-200);border:3px solid var(--gray-200);border-top-color:var(--primary-500);border-radius:50%;animation:spin 1s linear infinite}:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px;border-radius:4px}.skip-link{position:absolute;top:-40px;left:6px;background:var(--gray-900);color:white;padding:8px 16px;text-decoration:none;border-radius:4px;font-weight:600;z-index:1000}.skip-link:focus{top:6px}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInLeft{0%{opacity:0;transform:translateX(-20px)}to{opacity:1;transform:translateX(0)}}@keyframes spin{to{transform:rotate(1turn)}}@media (max-width:768px){.hero{padding:var(--space-6) var(--space-4);min-height:calc(100vh - 60px)}.hero__title{font-size:2.5rem}.hero__subtitle{font-size:1.125rem}.feature-grid{grid-template-columns:1fr;gap:var(--space-6);margin-top:var(--space-12)}.feature-card{padding:var(--space-6)}.btn{width:100%;justify-content:center}.btn--large{padding:var(--space-4) var(--space-6)}.tutor-chat{height:calc(100vh - 80px);margin:var(--space-4);border-radius:12px}.auth-card{padding:var(--space-8);margin:var(--space-4)}.message__bubble{max-width:85%}}@media (min-width:1024px){.feature-grid{grid-template-columns:repeat(3,1fr)}.hero__content{max-width:1400px}}@media (prefers-contrast:high){.feature-card{border:2px solid var(--gray-300)}.btn--primary{background:var(--primary-700)}.btn--secondary{background:white;border:2px solid var(--gray-400)}}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.dashboard-layout{display:flex;height:100vh;background:#ffffff;overflow:hidden;font-family:var(--font-family)}.dashboard-sidebar{width:280px;background:#f8fafc;border-right:1px solid #e2e8f0;display:flex;flex-direction:column;transition:width .3s ease;overflow:hidden}.dashboard-sidebar.collapsed{width:60px}.sidebar-header{justify-content:space-between;padding:16px;border-bottom:1px solid #e2e8f0}.brand,.sidebar-header{display:flex;align-items:center}.brand{gap:12px}.brand-icon{font-size:24px}.brand-text{font-size:18px;font-weight:600;color:#1e293b}.sidebar-toggle{background:none;border:none;color:#64748b;cursor:pointer;padding:6px;border-radius:6px;transition:all .2s ease;font-size:14px}.sidebar-toggle:hover{background:#e2e8f0;color:#1e293b}.sidebar-section{padding:16px}.new-chat-btn{display:flex;align-items:center;gap:12px;width:100%;padding:12px 16px;background:#3b82f6;color:white;border-radius:12px;text-decoration:none;font-weight:500;transition:all .2s ease;font-size:14px}.new-chat-btn:hover{background:#2563eb;transform:translateY(-1px);box-shadow:0 4px 12px rgba(59,130,246,.3)}.plus-icon{font-size:16px;font-weight:700}.sidebar-nav{flex:1 1;padding:0 16px}.nav-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:8px;text-decoration:none;color:#64748b;transition:all .2s ease;margin-bottom:2px;font-size:14px}.nav-item:hover{background:#e2e8f0;color:#1e293b}.nav-item.active{background:#dbeafe;color:#3b82f6}.nav-icon{font-size:16px;width:20px;text-align:center}.nav-text{font-weight:500}.section-title{font-size:12px;font-weight:600;color:#64748b;margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.chat-history{display:flex;flex-direction:column;gap:2px}.chat-history-item{padding:8px 12px;border-radius:6px;cursor:pointer;transition:background .2s ease}.chat-history-item:hover{background:#e2e8f0}.chat-title{font-size:13px;font-weight:500;margin-bottom:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-time{font-size:11px;color:#64748b}.sidebar-footer{padding:16px;border-top:1px solid #e2e8f0}.user-profile{gap:12px}.user-avatar,.user-profile{display:flex;align-items:center}.user-avatar{width:32px;height:32px;border-radius:50%;background:#3b82f6;color:white;justify-content:center;font-weight:600;font-size:14px;flex-shrink:0}.user-info{flex:1 1;min-width:0}.user-name{font-size:14px;font-weight:600;color:#1e293b}.user-plan{font-size:12px;color:#64748b}.user-menu-btn{background:none;border:none;color:#64748b;cursor:pointer;padding:6px;border-radius:4px;transition:all .2s ease;font-size:14px}.user-menu-btn:hover{background:#e2e8f0;color:#1e293b}.dashboard-main{overflow:hidden;background:#ffffff}.chat-interface,.dashboard-main{flex:1 1;display:flex;flex-direction:column}.chat-interface{max-width:1000px;margin:0 auto;width:100%;padding:0 24px}.chat-header{padding:32px 0;text-align:center}.chat-title{font-size:28px;font-weight:600;color:#1e293b;margin-bottom:8px}.chat-subtitle{color:#64748b;font-size:16px}.topic-selector{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:20px}.topic-btn{padding:8px 16px;border-radius:20px;border:1px solid #e2e8f0;background:#ffffff;color:#64748b;text-decoration:none;font-size:14px;font-weight:500;transition:all .2s ease}.topic-btn:hover{background:#f1f5f9;border-color:#cbd5e1;color:#1e293b}.topic-btn.active{background:#3b82f6;color:white;border-color:#3b82f6}.difficulty-selector{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:16px;gap:16px;max-width:800px;margin:32px auto 0}.difficulty-btn{padding:20px 16px;border-radius:12px;border:2px solid #e2e8f0;background:#ffffff;text-align:center;cursor:pointer;transition:all .2s ease}.difficulty-btn:hover{border-color:#3b82f6;transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.1)}.difficulty-btn.selected{border-color:#3b82f6;background:#dbeafe}.difficulty-title{font-weight:600;color:#1e293b;margin-bottom:6px;font-size:14px}.difficulty-desc{font-size:12px;color:#64748b;line-height:1.4}.quick-actions{padding:40px 0;text-align:center}.quick-actions h2{font-size:24px;font-weight:600;color:#1e293b;margin-bottom:32px}.action-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:24px;gap:24px;max-width:900px;margin:0 auto}.action-card{padding:24px;border-radius:16px;border:1px solid #e2e8f0;background:#ffffff;text-decoration:none;transition:all .3s ease;text-align:left}.action-card:hover{border-color:#3b82f6;transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.08)}.action-icon{font-size:32px;margin-bottom:16px}.action-title{font-size:18px;font-weight:600;color:#1e293b;margin-bottom:8px}.action-desc{color:#64748b;line-height:1.5;font-size:14px}@media (max-width:768px){.dashboard-sidebar{width:60px}.dashboard-sidebar.collapsed{width:0}.chat-interface{padding:0 16px}.difficulty-selector{grid-template-columns:repeat(2,1fr);gap:12px}.chat-title{font-size:24px}.quick-actions h2{font-size:20px;margin-bottom:24px}}