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h1{font-size:4rem;font-weight:800;color:#000;margin-bottom:24px;line-height:1.1}.hero-description{font-size:1.25rem;color:#555;line-height:1.7;margin-bottom:48px;max-width:650px;margin-left:auto;margin-right:auto}.hero-stats{display:flex;align-items:center;justify-content:center;gap:40px;padding:32px 48px;background:#fff;border-radius:20px;box-shadow:0 10px 40px #00000014;border:1px solid rgba(0,0,0,.05)}.stat-item{text-align:center}.stat-number{display:block;font-size:2.5rem;font-weight:800;color:#000;line-height:1;margin-bottom:8px;background:linear-gradient(90deg,#ffa0a0,#fc9,#d4ffa9,#94c9ff);background-size:200% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:aurora-shift 4s ease infinite}.stat-label{font-size:.9rem;color:#666;font-weight:500}.stat-divider{width:1px;height:50px;background:linear-gradient(180deg,transparent,#ddd,transparent)}.mission-section{padding:100px 0;background:#fff}.mission-grid{display:grid;grid-template-columns:1fr 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p{font-size:.95rem;color:#666;line-height:1.7;position:relative;z-index:1}.feature-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px;position:relative;z-index:1}.feature-tags span{padding:6px 14px;background:#ffffff26;border-radius:50px;font-size:.8rem;font-weight:600;color:#fff;border:1px solid rgba(255,255,255,.2)}.how-it-works-section{padding:100px 0;background:#fff}.steps-container{display:flex;align-items:center;justify-content:center;gap:20px}.step-card{flex:1;max-width:320px;background:#fff;border-radius:24px;padding:40px 32px;text-align:center;border:2px solid #f0f0f0;transition:all .4s ease;position:relative}.step-card:hover{border-color:#000;transform:translateY(-8px);box-shadow:0 20px 50px #0000001a}.step-number{width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:#000;color:#fff;font-size:1.5rem;font-weight:800;border-radius:50%;margin:0 auto 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#00000014;transform:translateY(-5px)}.testimonial-stars{color:gold;font-size:1.2rem;margin-bottom:16px;letter-spacing:2px}.testimonial-text{font-size:1rem;color:#444;line-height:1.7;margin-bottom:24px;position:relative;z-index:1}.testimonial-author{display:flex;align-items:center;gap:12px}.author-avatar{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:#000;color:#fff;font-weight:700;border-radius:50%}.author-info{display:flex;flex-direction:column}.author-name{font-weight:700;color:#000}.author-role{font-size:.85rem;color:#888}.faq-section{padding:100px 0;background:linear-gradient(180deg,#f8f9fa,#fff)}.faq-grid{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}.faq-item{background:#fff;border-radius:16px;border:2px solid #f0f0f0;overflow:hidden;transition:all .3s 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a:hover{opacity:.6}.footer-copyright{font-size:.85rem;color:#888}.reveal-on-scroll{opacity:0;transform:translateY(30px);transition:all .6s ease}.reveal-on-scroll.revealed{opacity:1;transform:translateY(0)}.features-grid .reveal-on-scroll:nth-child(1){transition-delay:.1s}.features-grid .reveal-on-scroll:nth-child(2){transition-delay:.2s}.features-grid .reveal-on-scroll:nth-child(3){transition-delay:.3s}.features-grid .reveal-on-scroll:nth-child(4){transition-delay:.4s}.features-grid .reveal-on-scroll:nth-child(5){transition-delay:.5s}.features-grid .reveal-on-scroll:nth-child(6){transition-delay:.6s}.subjects-grid .reveal-on-scroll:nth-child(1){transition-delay:.1s}.subjects-grid .reveal-on-scroll:nth-child(2){transition-delay:.2s}.subjects-grid .reveal-on-scroll:nth-child(3){transition-delay:.3s}.subjects-grid .reveal-on-scroll:nth-child(4){transition-delay:.4s}.testimonials-grid .reveal-on-scroll:nth-child(1){transition-delay:.1s}.testimonials-grid .reveal-on-scroll:nth-child(2){transition-delay:.2s}.testimonials-grid .reveal-on-scroll:nth-child(3){transition-delay:.3s}@media(max-width:1024px){.features-grid{grid-template-columns:repeat(2,1fr)}.feature-card.featured{grid-column:span 2;grid-row:span 1}.subjects-grid{grid-template-columns:repeat(2,1fr)}.steps-container{flex-direction:column;gap:24px}.step-connector{transform:rotate(90deg)}.step-card{max-width:100%}}@media(max-width:768px){.navbar{padding:16px 20px}.nav-links{gap:16px}.nav-links a{display:none}.hero-content h1{font-size:2.5rem}.hero-description{font-size:1.1rem}.hero-stats{flex-direction:column;gap:24px;padding:24px}.stat-divider{width:60px;height:1px}.mission-grid{grid-template-columns:1fr;gap:48px}.features-grid,.subjects-grid{grid-template-columns:1fr}.feature-card.featured{grid-column:span 1}.testimonials-grid{grid-template-columns:1fr}.section-header h2,.cta-content 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#ffffff1a}.new-chat-btn:before{content:"";position:absolute;inset:-4px;background:conic-gradient(from var(--angle),#ffa0a0,#ffcc99,#ffffa7,#d4ffa9,#b3ffd9,#aeffff,#94c9ff,#ca94ff,#ff93ff,#ffa1d0,#ffa0a0);border-radius:14px;z-index:-1;opacity:0;filter:blur(15px);transition:opacity .4s ease;animation:spin 3s linear infinite}.new-chat-btn:hover{transform:translateY(-2px) scale(1.02);background:#fff;color:#000;box-shadow:0 8px 25px #00000026,inset 0 1px #ffffff26}.new-chat-btn:hover:before{opacity:1}.new-chat-btn:active{transform:translateY(-1px) scale(1)}.chat-list{flex:1;overflow-y:auto;padding:12px}.chat-list::-webkit-scrollbar{width:6px}.chat-list::-webkit-scrollbar-track{background:transparent}.chat-list::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.chat-list::-webkit-scrollbar-thumb:hover{background:#ced4da}.chat-item{display:flex;align-items:center;gap:12px;padding:12px 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#0000001a}.chat-messages{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px;background:linear-gradient(180deg,var(--bg-primary) 0%,var(--bg-secondary) 100%)}.chat-messages::-webkit-scrollbar{width:8px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}.chat-messages::-webkit-scrollbar-thumb:hover{background:#ced4da}.welcome-message{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;height:100%;padding:40px;animation:fadeIn .5s ease}.welcome-icon{width:80px;height:80px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#ffa0a0,#fc9,#ffffa7,#d4ffa9,#b3ffd9,#aeffff,#94c9ff);background-size:200% 200%;animation:aurora-shift 5s ease infinite;border-radius:50%;margin-bottom:24px;color:#000;box-shadow:0 8px 32px #0000001a,0 0 60px #94c9ff4d}.welcome-message h2{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:8px}.welcome-message p{color:var(--text-secondary);max-width:400px;font-weight:500}.message{display:flex;gap:12px;max-width:85%;animation:slideUp .3s ease}.message.user{align-self:flex-end;flex-direction:row-reverse}.message-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.875rem;font-weight:600}.message.user .message-avatar{background:#000;color:#fff}.message.assistant .message-avatar{background:linear-gradient(135deg,#aeffff,#94c9ff,#ca94ff,#ff93ff);background-size:200% 200%;animation:aurora-shift 4s ease infinite;color:#000}.message-content{padding:14px 18px;border-radius:var(--radius-lg);font-size:.9375rem;line-height:1.6;word-wrap:break-word}.message.user .message-content{background:var(--user-bubble);color:var(--user-text);border-bottom-right-radius:4px;box-shadow:0 4px 15px #00000026}.message.assistant .message-content{background:var(--ai-bubble);color:var(--ai-text);border-bottom-left-radius:4px;box-shadow:var(--shadow-md);border:1px solid var(--border-color)}.message-content img{max-width:300px;max-height:200px;border-radius:var(--radius-sm);margin-top:8px;display:block;box-shadow:var(--shadow-sm)}.message-content p{margin:0}.message-content p+p{margin-top:12px}.message-content code{background:#00000014;padding:2px 6px;border-radius:4px;font-family:SF Mono,Monaco,Courier New,monospace;font-size:.875em}.message.user .message-content code{background:#fff3}.message-content pre{background:#1e1e1e;color:#e2e8f0;padding:16px;border-radius:var(--radius-sm);overflow-x:auto;margin:12px 0}.message-content pre code{background:transparent;padding:0;color:inherit}.typing-indicator{display:flex;gap:4px;padding:8px 0}.typing-indicator span{width:8px;height:8px;background:linear-gradient(135deg,#94c9ff,#ca94ff);border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:-.32s}.typing-indicator span:nth-child(2){animation-delay:-.16s}.chat-input-container{padding:16px 24px 24px;background:var(--bg-primary)}.file-preview{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap}.file-preview:empty{display:none}.file-preview-item{position:relative;display:inline-flex;border-radius:var(--radius-sm);overflow:hidden;border:2px solid var(--border-color);box-shadow:var(--shadow-sm)}.file-preview-item img{width:80px;height:80px;object-fit:cover}.file-preview-remove{position:absolute;top:4px;right:4px;width:20px;height:20px;background:#000000b3;border:none;border-radius:50%;color:#fff;font-size:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition)}.file-preview-remove:hover{background:var(--danger);transform:scale(1.1)}.chat-input-form{display:flex;align-items:flex-end;gap:12px;padding:12px 16px;background:var(--bg-primary);border:2px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);transition:var(--transition);position:relative}.chat-input-form:before{content:"";position:absolute;inset:-4px;background:conic-gradient(from var(--angle),#ffa0a0,#ffcc99,#ffffa7,#d4ffa9,#b3ffd9,#aeffff,#94c9ff,#ca94ff,#ff93ff,#ffa1d0,#ffa0a0);border-radius:24px;z-index:-1;opacity:0;filter:blur(20px);transition:opacity .4s ease;animation:spin 3s linear infinite}.chat-input-form:focus-within{border-color:#000;box-shadow:var(--shadow-lg)}.chat-input-form:focus-within:before{opacity:.6}.file-upload-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);color:var(--text-secondary);flex-shrink:0}.file-upload-btn:hover{background:var(--bg-tertiary);color:#000}#message-input{flex:1;border:none;background:transparent;font-size:.9375rem;font-family:inherit;resize:none;outline:none;color:var(--text-primary);max-height:150px;line-height:1.5;padding:8px 0}#message-input::placeholder{color:var(--text-muted)}.send-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:#000;border:none;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);color:#fff;flex-shrink:0;position:relative;z-index:1}.send-btn:before{content:"";position:absolute;inset:-4px;background:conic-gradient(from var(--angle),#ffa0a0,#ffcc99,#ffffa7,#d4ffa9,#b3ffd9,#aeffff,#94c9ff,#ca94ff,#ff93ff,#ffa1d0,#ffa0a0);border-radius:14px;z-index:-1;opacity:0;filter:blur(10px);transition:opacity .4s ease;animation:spin 3s linear infinite}.send-btn:hover:not(:disabled){background:#fff;color:#000;transform:scale(1.05);box-shadow:var(--shadow-md)}.send-btn:hover:not(:disabled):before{opacity:1}.send-btn:disabled{background:var(--bg-tertiary);color:var(--text-muted);cursor:not-allowed}.error-message{background:#fef2f2;border:1px solid #fecaca;color:var(--danger);padding:12px 16px;border-radius:var(--radius-md);font-size:.875rem;text-align:center}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}@media(max-width:768px){.sidebar{position:fixed;left:-280px;top:0;height:100%;z-index:100;transition:left .3s ease;box-shadow:var(--shadow-lg)}.sidebar.open{left:0}.chat-main{width:100%}.message{max-width:95%}.chat-messages{padding:16px}.chat-input-container{padding:12px 16px 16px}}.message-content .md-h1{font-size:1.75rem;font-weight:700;color:var(--text-primary);margin:24px 0 16px;padding-bottom:8px;border-bottom:2px solid var(--border-color);line-height:1.3}.message-content .md-h2{font-size:1.4rem;font-weight:600;color:var(--text-primary);margin:20px 0 12px;padding-bottom:6px;border-bottom:1px solid var(--border-color);line-height:1.3}.message-content .md-h3{font-size:1.15rem;font-weight:600;color:var(--text-primary);margin:18px 0 10px;line-height:1.4}.message-content .md-h4{font-size:1rem;font-weight:600;color:var(--text-secondary);margin:14px 0 8px;line-height:1.4}.message-content .md-h1:first-child,.message-content .md-h2:first-child,.message-content .md-h3:first-child,.message-content .md-h4:first-child{margin-top:0}.message-content .divider{border:none;height:2px;background:linear-gradient(to right,transparent,#ffa0a0,#ffffa7,#b3ffd9,#94c9ff,#ca94ff,transparent);margin:24px 0;border-radius:1px}.message-content .md-blockquote{margin:16px 0;padding:12px 16px;border-left:4px solid #000000;background:var(--bg-secondary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-primary);font-style:italic}.message-content .md-blockquote strong{font-style:normal}.message-content .md-list{margin:12px 0;padding-left:24px}.message-content .md-list li{margin:6px 0;line-height:1.6}.message-content .md-list li::marker{color:#000}.message-content ol.md-list{list-style-type:decimal}.message-content ul.md-list{list-style-type:disc}.message-content .md-list .md-list{margin:4px 0}.message-content .code-block{margin:16px 0;border-radius:var(--radius-md);overflow:hidden;background:#1e1e1e;box-shadow:var(--shadow-lg);border:1px solid #333}.message-content .code-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:#2d2d2d;border-bottom:1px solid #404040}.message-content .code-lang{font-size:.75rem;font-weight:600;color:#888;text-transform:uppercase;letter-spacing:.5px}.message-content .code-copy{padding:4px 10px;background:transparent;border:1px solid #555;border-radius:var(--radius-sm);color:#888;font-size:.75rem;cursor:pointer;transition:var(--transition)}.message-content .code-copy:hover{background:#404040;color:#fff;border-color:#666}.message-content .code-copy.copied{background:var(--success);border-color:var(--success);color:#fff}.message-content .code-block pre{margin:0;padding:16px;overflow-x:auto;background:transparent}.message-content .code-block code{font-family:SF Mono,Fira Code,Consolas,monospace;font-size:.875rem;line-height:1.6;color:#e2e8f0;background:transparent;padding:0}.message-content .inline-code{background:#00000014;color:#000;padding:2px 6px;border-radius:4px;font-family:SF Mono,Fira Code,Consolas,monospace;font-size:.875em;border:1px solid rgba(0,0,0,.1)}.message-content .table-wrapper{margin:16px 0;overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--border-color);box-shadow:var(--shadow-sm)}.message-content .md-table{width:100%;border-collapse:collapse;font-size:.875rem}.message-content .md-table th{background:#000;color:#fff;padding:12px 16px;text-align:left;font-weight:600;border-bottom:2px solid var(--border-color);white-space:nowrap}.message-content .md-table td{padding:10px 16px;border-bottom:1px solid var(--border-color);color:var(--text-secondary)}.message-content .md-table tr:last-child td{border-bottom:none}.message-content .md-table tr:hover td{background:var(--bg-secondary)}.message-content .math-inline{display:inline-flex;align-items:center;padding:3px 8px;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:6px;font-family:Times New 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.math-frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 3px;text-align:center}.message-content .math-num{border-bottom:1.5px solid currentColor;padding:0 4px 2px;line-height:1.2}.message-content .math-den{padding:2px 4px 0;line-height:1.2}.message-content .math-frac .math-frac{font-size:.85em}.message-content .math-sqrt{display:inline-flex;align-items:stretch;vertical-align:middle}.message-content .math-sqrt-sym{font-size:1.2em;line-height:1;margin-right:1px}.message-content .math-sqrt-content{border-top:1.5px solid currentColor;padding:0 4px;margin-top:2px}.message-content .math-bigop{display:inline-flex;align-items:center;vertical-align:middle;margin:0 4px}.message-content .math-op{font-size:1.5em;line-height:1;font-family:Times New Roman,serif}.message-content .math-limits{display:inline-flex;flex-direction:column;align-items:center;font-size:.7em;margin-left:2px;line-height:1.2}.message-content 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