:root{--primary:#10b981;--primary-dark:#059669;--primary-light:#d1fae5;--secondary:#06b6d4;--accent:#84cc16;--bg:#f8fafc;--surface:#ffffffd9;--text:#0f172a;--text-muted:#475569;--border:#0f172a14;--shadow:0 20px 60px #00000014;--radius:20px;--radius-lg:28px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:Noto Sans SC,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6;overflow-x:hidden}.container{max-width:1200px;margin:0 auto;padding:0 24px}.ambient-bg{pointer-events:none;z-index:-1;position:fixed;inset:0;overflow:hidden}.orb{filter:blur(80px);opacity:.45;border-radius:50%;animation:12s ease-in-out infinite 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a{color:var(--text-muted);font-size:.95rem;font-weight:500;text-decoration:none;transition:color .2s}.main-nav a:hover{color:var(--primary-dark)}.btn{cursor:pointer;border:none;border-radius:999px;justify-content:center;align-items:center;gap:8px;font-weight:600;text-decoration:none;transition:all .2s;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);color:#fff;box-shadow:0 8px 24px #10b98147}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px #10b9815c}.btn-outline{color:var(--primary-dark);background:#fff9;border:1.5px solid #10b9814d}.btn-outline:hover{background:var(--primary-light);border-color:var(--primary)}.btn-sm{padding:8px 18px;font-size:.875rem}.btn-lg{padding:14px 32px;font-size:1rem}.hero{padding:100px 0 80px;position:relative}.hero-inner{grid-template-columns:1.1fr .9fr;align-items:center;gap:60px;display:grid}.badge{color:var(--primary-dark);background:#10b9811a;border-radius:999px;align-items:center;gap:8px;margin-bottom:24px;padding:8px 16px;font-size:.875rem;font-weight:600;display:inline-flex}.badge-dot{background:var(--primary);border-radius:50%;width:8px;height:8px;animation:2s infinite pulse}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.6;transform:scale(1.2)}}.hero-title{letter-spacing:-.02em;margin-bottom:24px;font-size:3.6rem;font-weight:900;line-height:1.15}.gradient-text{background:linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);color:#0000;-webkit-background-clip:text;background-clip:text}.hero-subtitle{color:var(--text-muted);max-width:520px;margin-bottom:36px;font-size:1.15rem;line-height:1.8}.hero-actions{gap:16px;margin-bottom:48px;display:flex}.hero-stats{gap:48px;display:flex}.stat{text-align:left}.stat-value{color:var(--primary-dark);font-size:2rem;font-weight:800}.stat-label{color:var(--text-muted);font-size:.9rem}.hero-visual{justify-content:center;align-items:center;display:flex}.earth-ring{width:360px;height:360px;position:relative}.earth-core{background:radial-gradient(circle at 30% 30%,#34d399,#10b981);border-radius:50%;justify-content:center;align-items:center;width:160px;height:160px;font-size:5rem;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 20px 60px #10b9814d}.orbit{background:#ffffffe6;border-radius:50%;justify-content:center;align-items:center;width:56px;height:56px;margin:-28px 0 0 -28px;font-size:1.75rem;display:flex;position:absolute;top:50%;left:50%;box-shadow:0 8px 24px #00000014}.orbit-1{animation:10s linear infinite orbit1}.orbit-2{animation:14s linear infinite orbit2}.orbit-3{animation:18s linear infinite orbit3}@keyframes orbit1{0%{transform:rotate(0)translate(140px)rotate(0)}to{transform:rotate(360deg)translate(140px)rotate(-360deg)}}@keyframes orbit2{0%{transform:rotate(120deg)translate(170px)rotate(-120deg)}to{transform:rotate(480deg)translate(170px)rotate(-480deg)}}@keyframes orbit3{0%{transform:rotate(240deg)translate(120px)rotate(-240deg)}to{transform:rotate(600deg)translate(120px)rotate(-600deg)}}.section-header{text-align:center;max-width:640px;margin:0 auto 56px}.section-title{margin-bottom:16px;font-size:2.25rem;font-weight:800}.section-desc{color:var(--text-muted);font-size:1.05rem;line-height:1.7}.features{padding:80px 0}.feature-grid{grid-template-columns:repeat(3,1fr);gap:24px;display:grid}.feature-grid-4{grid-template-columns:repeat(4,1fr)}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:32px;transition:transform .3s,box-shadow .3s}.feature-card:hover{box-shadow:var(--shadow);transform:translateY(-6px)}.feature-icon{background:linear-gradient(135deg, var(--primary-light), #fff);border-radius:16px;justify-content:center;align-items:center;width:56px;height:56px;margin-bottom:20px;font-size:1.75rem;display:flex}.feature-card h3{margin-bottom:10px;font-size:1.2rem;font-weight:700}.feature-card p{color:var(--text-muted);font-size:.95rem;line-height:1.7}.chat-section{padding:80px 0}.chat-layout{grid-template-columns:1fr 1.6fr;align-items:start;gap:40px;display:grid}.chat-intro{position:sticky;top:100px}.chat-intro .section-title,.chat-intro .section-desc{text-align:left}.quick-topics{flex-wrap:wrap;gap:10px;margin-top:28px;display:flex}.topic-tag{color:var(--primary-dark);cursor:pointer;background:#10b98114;border:1px solid #10b9812e;border-radius:999px;padding:8px 16px;font-size:.875rem;font-weight:500;transition:all .2s;display:inline-flex}.topic-tag:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.chat-window{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);flex-direction:column;height:680px;display:flex;overflow:hidden}.chat-header{border-bottom:1px solid var(--border);background:#fff9;align-items:center;gap:14px;padding:18px 24px;display:flex}.chat-avatar{background:linear-gradient(135deg, var(--primary), var(--primary-dark));border-radius:50%;justify-content:center;align-items:center;width:44px;height:44px;font-size:1.4rem;display:flex}.chat-info{flex:1}.chat-name{font-size:1rem;font-weight:700}.chat-status{color:var(--text-muted);align-items:center;gap:6px;margin-top:2px;font-size:.8rem;display:flex}.status-dot{background:var(--primary);border-radius:50%;width:8px;height:8px;animation:2s infinite pulse}.chat-clear{cursor:pointer;background:0 0;border:none;border-radius:8px;padding:6px;font-size:1.1rem;transition:background .2s}.chat-clear:hover{background:#0000000a}.chat-messages{scroll-behavior:smooth;flex-direction:column;flex:1;gap:18px;padding:24px;display:flex;overflow-y:auto}.message{gap:12px;max-width:92%;animation:.35s messageIn;display:flex}@keyframes messageIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.user-message{flex-direction:row-reverse;align-self:flex-end}.bot-message{align-self:flex-start}.message-avatar{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:1rem;display:flex}.user-message .message-avatar{background:#e2e8f0}.bot-message .message-avatar{background:linear-gradient(135deg, var(--primary-light), #fff)}.message-content{white-space:pre-wrap;word-break:break-word;border-radius:18px;padding:14px 18px;font-size:.95rem;line-height:1.75}.user-message .message-content{background:linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);color:#fff;border-bottom-right-radius:4px}.bot-message .message-content{border:1px solid var(--border);color:var(--text);background:#fff;border-bottom-left-radius:4px}.bot-message .message-content p+p{margin-top:.8em}.bot-message .message-content strong{color:var(--primary-dark)}.bot-message .message-content ul,.bot-message .message-content ol{margin:.8em 0 .8em 1.2em}.bot-message .message-content li{margin:.35em 0}.message-content img{border-radius:12px;max-width:100%}.message-content code{background:#10b9811a;border-radius:4px;padding:2px 6px;font-family:SFMono-Regular,Consolas,monospace;font-size:.9em}.message-content pre{color:#e2e8f0;background:#0f172a;border-radius:12px;margin:.8em 0;padding:14px;overflow-x:auto}.message-content pre code{color:inherit;background:0 0;padding:0}.message-content a{color:var(--primary-dark);text-decoration:underline}.chat-input-area{border-top:1px solid var(--border);background:#fff9;padding:18px 24px 24px}.input-wrapper{border:1px solid var(--border);background:#fff;border-radius:18px;align-items:flex-end;gap:10px;padding:10px 12px 10px 18px;display:flex;box-shadow:0 4px 16px #0000000a}.input-wrapper textarea{resize:none;max-height:120px;color:var(--text);background:0 0;border:none;outline:none;flex:1;font-family:inherit;font-size:.95rem;line-height:1.6}.input-wrapper textarea::placeholder{color:#94a3b8}.send-btn{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;cursor:pointer;border:none;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;transition:transform .2s,box-shadow .2s;display:flex}.send-btn:hover:not(:disabled){transform:scale(1.05);box-shadow:0 8px 20px #10b9814d}.send-btn:disabled{opacity:.5;cursor:not-allowed}.send-btn svg{width:18px;height:18px}.chat-hint{text-align:center;color:#94a3b8;margin-top:10px;font-size:.75rem}.chat-typing{padding:0 24px 10px}.typing-dots{border:1px solid var(--border);background:#fff;border-radius:18px 18px 18px 4px;gap:6px;width:fit-content;padding:14px 18px;display:flex}.typing-dots span{background:var(--primary);border-radius:50%;width:8px;height:8px;animation:1.4s ease-in-out infinite typingBounce}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}@keyframes typingBounce{0%,80%,to{transform:translateY(0)}40%{transform:translateY(-6px)}}.about{padding:60px 0 100px}.about-card{border:1px solid var(--border);border-radius:var(--radius-lg);text-align:center;background:linear-gradient(135deg,#10b9810f,#06b6d40f);padding:48px}.about-card p{color:var(--text-muted);max-width:760px;margin:0 auto 16px;line-height:1.8}.about-card p:last-child{margin-bottom:0}.site-footer{border-top:1px solid var(--border);background:#ffffff80;padding:40px 0}.footer-content{flex-direction:column;align-items:center;gap:12px;display:flex}.footer-brand{align-items:center;gap:10px;font-size:1.15rem;font-weight:800;display:flex}.footer-copy{color:var(--text-muted);font-size:.85rem}.error-toast{color:#dc2626;z-index:200;background:#fff;border:1px solid #dc262626;border-radius:14px;padding:14px 24px;font-size:.9rem;font-weight:500;animation:.3s toastIn;position:fixed;bottom:28px;left:50%;transform:translate(-50%);box-shadow:0 12px 40px #0000001f}@keyframes toastIn{0%{opacity:0;transform:translate(-50%,20px)}to{opacity:1;transform:translate(-50%)}}@media (max-width:960px){.hero-inner{text-align:center;grid-template-columns:1fr}.hero-content{order:1}.hero-visual{order:0}.hero-title{font-size:2.6rem}.hero-subtitle{margin:0 auto 36px}.hero-actions,.hero-stats{justify-content:center}.feature-grid{grid-template-columns:repeat(2,1fr)}.chat-layout{grid-template-columns:1fr}.chat-intro{text-align:center;position:static}.chat-intro .section-title,.chat-intro .section-desc{text-align:center}.quick-topics{justify-content:center}}@media (max-width:640px){.main-nav{display:none}.hero{padding:60px 0 50px}.hero-title{font-size:2.1rem}.hero-actions{flex-direction:column}.hero-stats{justify-content:center;gap:24px}.feature-grid{grid-template-columns:1fr}.earth-ring{width:260px;height:260px}.earth-core{width:110px;height:110px;font-size:3.5rem}@keyframes orbit1{0%{transform:rotate(0)translate(90px)rotate(0)}to{transform:rotate(360deg)translate(90px)rotate(-360deg)}}@keyframes orbit2{0%{transform:rotate(120deg)translate(115px)rotate(-120deg)}to{transform:rotate(480deg)translate(115px)rotate(-480deg)}}@keyframes orbit3{0%{transform:rotate(240deg)translate(75px)rotate(-240deg)}to{transform:rotate(600deg)translate(75px)rotate(-600deg)}}.chat-window{height:560px}.about-card{padding:28px}}body{font-family:Noto Sans SC,Microsoft YaHei,Segoe UI,sans-serif}button,textarea{font:inherit}.topic-tag{-webkit-appearance:none;appearance:none}.message-content{white-space:pre-wrap}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}