:root{--bg-color: #f2f4f7;--text-primary: #1a1a2e;--text-secondary: #6b7280;--accent-color: #5a7aa1;--card-bg: #f9fafb;--border-color: #e5e7eb;--font-family: "Helvetica Neue", Helvetica, "-apple-system", BlinkMacSystemFont, Arial, sans-serif;--max-width: 1200px;--spacing-base: 1rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;padding-top:80px}h1{font-size:clamp(3rem,8vw,6rem);font-weight:500;letter-spacing:-.04em;line-height:1.1;margin-bottom:var(--spacing-base);color:var(--text-primary)}h2{font-size:clamp(2rem,5vw,3rem);font-weight:500;letter-spacing:-.02em;margin-bottom:2rem;color:var(--text-primary)}p{font-size:1.125rem;color:var(--text-secondary)}.lang-toggle{position:fixed;top:1.5rem;right:2rem;display:flex;align-items:center;gap:.4rem;z-index:200;background:#ffffff40;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,.45);border-radius:20px;padding:.35rem .8rem;box-shadow:0 2px 8px #0000000a}.lang-btn{background:none;border:none;font-family:var(--font-family);font-size:.8rem;font-weight:600;letter-spacing:.05em;color:var(--text-secondary);cursor:pointer;padding:.1rem .2rem;transition:color .2s ease}.lang-btn.active,.lang-btn:hover{color:var(--text-primary)}.lang-divider{color:var(--border-color);font-size:.75rem;-webkit-user-select:none;user-select:none}.navbar{position:absolute;top:0;left:0;width:100%;height:80px;display:flex;justify-content:space-between;align-items:center;padding:0 5%;background:transparent;z-index:100}.logo{font-weight:600;font-size:1.5rem;width:40px;height:40px;background-color:transparent;color:var(--text-primary);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;border-radius:50%}.nav-links a{text-decoration:none;color:var(--text-secondary);margin-left:2rem;font-weight:500;transition:color .3s ease}.nav-links a:hover{color:var(--text-primary)}.hero{height:100vh;width:100%;display:flex;align-items:center;justify-content:center;padding:0;margin:0;position:relative}.canvas-container{position:absolute;top:0;left:0;width:100%;height:100%;z-index:0}.ui-layer{position:relative;z-index:10;width:100%;max-width:800px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:0 5%;pointer-events:none}.chat-container{pointer-events:auto;width:100%;max-width:800px;display:flex;flex-direction:column;position:relative;margin-top:15rem}.chat-container{width:100%;max-width:800px;display:flex;flex-direction:column;position:relative;margin-top:-2rem}.chat-history{width:100%;max-height:400px;overflow-y:auto;padding:1.5rem 1rem;display:flex;flex-direction:column;gap:1.5rem;font-size:1.1rem;margin-bottom:1.5rem;mask-image:linear-gradient(to bottom,transparent,black 10%,black 90%,transparent);-webkit-mask-image:linear-gradient(to bottom,transparent,black 10%,black 90%,transparent)}.chat-history.hidden{display:none}.message{padding:1rem 1.5rem;border-radius:12px;max-width:85%;line-height:1.6;animation:fadeUp .3s ease forwards;font-weight:400}.system-msg{display:none}.user-msg{align-self:flex-end;background:#ffffffd9;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);color:var(--text-primary);border:1px solid rgba(0,0,0,.08);border-radius:20px 20px 4px;box-shadow:0 4px 15px #0000000d}.ai-msg{align-self:flex-start;background:#1e293bd9;backdrop-filter:blur(30px) saturate(150%);-webkit-backdrop-filter:blur(30px) saturate(150%);color:#f8fafc;border:1px solid rgba(255,255,255,.1);border-radius:20px 20px 20px 4px;box-shadow:0 8px 32px #00000026}.ai-msg p{margin-bottom:.8rem}.ai-msg p:last-child{margin-bottom:0}.ai-msg ul,.ai-msg ol{margin-left:1.5rem;margin-bottom:.8rem}.ai-msg li{margin-bottom:.4rem}.ai-msg strong{font-weight:600;color:var(--accent-color)}.ai-msg blockquote{border-left:3px solid var(--border-color);padding-left:1rem;margin:1rem 0;color:var(--text-secondary);font-style:italic}.typing-indicator:after{content:"■";animation:blink 1s step-end infinite;color:var(--accent-color);margin-left:4px}@keyframes blink{50%{opacity:0}}.suggested-questions{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center;margin-bottom:1.5rem;animation:fadeUp .4s ease forwards}.suggestion-btn{background:#ffffff40;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.45);border-radius:20px;padding:.55rem 1.1rem;font-family:var(--font-family);font-size:.9rem;color:var(--text-secondary);cursor:pointer;transition:background .2s ease,border-color .2s ease,color .2s ease;box-shadow:0 2px 8px #0000000a}.suggestion-btn:hover{background:#ffffff73;border-color:#ffffffb3;color:var(--text-primary)}.chat-input-wrapper{display:flex;width:100%;background:#ffffff47;backdrop-filter:blur(28px);-webkit-backdrop-filter:blur(28px);border:1px solid rgba(255,255,255,.5);border-radius:40px;overflow:hidden;box-shadow:0 10px 40px #0000000a,inset 0 0 0 1px #fff6;transition:border-color .3s ease,box-shadow .3s ease}.chat-input-wrapper:focus-within{border-color:#ffffffbf;box-shadow:0 10px 40px #00000014,inset 0 0 0 1px #ffffffb3}.chat-input-wrapper input{flex:1;padding:1.2rem 2rem;border:none;background:transparent;font-family:var(--font-family);font-size:1.125rem;color:var(--text-primary);outline:none}.chat-input-wrapper input::placeholder{color:#0006}.send-button{background:transparent;border:none;padding:0 1.8rem;color:var(--text-primary);cursor:pointer;transition:color .2s ease,transform .2s ease;display:flex;align-items:center;justify-content:center;opacity:.5}.send-button:hover{color:var(--accent-color);opacity:1;transform:translate(2px)}.chat-history::-webkit-scrollbar{width:6px}.chat-history::-webkit-scrollbar-track{background:transparent}.chat-history::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:10px}.principles-section{padding:8rem 5%;max-width:800px;margin:0 auto}.list-container{display:flex;flex-direction:column}.list-item{border-bottom:1px solid rgba(255,255,255,.05);padding:2.5rem 0;display:flex;align-items:flex-start;gap:2rem;transition:transform .3s ease,background-color .3s ease;cursor:default}.list-item:hover{background-color:#ffffff05}.list-item:last-child{border-bottom:none}.item-index{font-size:.875rem;font-weight:600;color:var(--accent-color);min-width:40px;padding-top:.4rem}.item-content{flex:1}.item-title{font-size:1.5rem;font-weight:500;margin-bottom:.5rem;color:var(--text-primary);transition:color .3s ease}.list-item:hover .item-title{color:var(--accent-color)}.item-desc{font-size:1.125rem;color:var(--text-secondary)}footer{text-align:center;padding:4rem 5%;border-top:1px solid var(--border-color);color:var(--text-secondary);font-size:.875rem}@keyframes fadeUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.fade-in-element{opacity:0;transform:translateY(20px);transition:opacity .8s cubic-bezier(.16,1,.3,1),transform .8s cubic-bezier(.16,1,.3,1)}.fade-in-element.visible{opacity:1;transform:translateY(0)}