*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#f8fafc;--bg-secondary:#e8f4ff;--bg-card:#ffffffe6;--border-color:#2979ff1f;--border-hover:#2979ff4d;--text-primary:#1a202c;--text-secondary:#2d3748bf;--text-muted:#718096b3;--accent:#2979ff;--accent-light:#1565c0;--accent-glow:#2979ff26;--gradient-accent:linear-gradient(135deg, #2979ff, #1565c0);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--shadow-card:0 4px 24px #2979ff14, 0 0 60px #2979ff08;--font-family:"Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-primary);flex-direction:column;min-height:100vh;display:flex;position:relative;overflow-x:hidden}#particleCanvas{pointer-events:none;z-index:0;width:100%;height:100%;position:fixed;inset:0}.bg-grid{pointer-events:none;z-index:0;background-image:linear-gradient(#2979ff0d 1px,#0000 1px),linear-gradient(90deg,#2979ff0d 1px,#0000 1px);background-size:60px 60px;position:fixed;inset:0;-webkit-mask-image:radial-gradient(80% 70%,#000 30%,#0000 100%);mask-image:radial-gradient(80% 70%,#000 30%,#0000 100%)}.bg-glow{pointer-events:none;z-index:0;background:radial-gradient(circle,#2979ff1f 0%,#0000 70%);width:800px;height:800px;animation:8s ease-in-out infinite glowPulse;position:fixed;top:-30%;left:50%;transform:translate(-50%)}.bg-glow-2{background:radial-gradient(circle,#1565c01a 0%,#0000 70%);width:600px;height:600px;animation:12s ease-in-out infinite glowDrift2;top:auto;bottom:-20%;left:-10%;transform:none}.bg-glow-3{background:radial-gradient(circle,#42a5f514 0%,#0000 70%);width:500px;height:500px;animation:15s ease-in-out infinite glowDrift3;top:40%;left:auto;right:-15%;transform:none}@keyframes glowPulse{0%,to{opacity:1;transform:translate(-50%)scale(1)}50%{opacity:.6;transform:translate(-50%)scale(1.1)}}@keyframes glowDrift2{0%,to{opacity:.8;transform:translate(0)}33%{opacity:1;transform:translate(40px,-30px)}66%{opacity:.5;transform:translate(-20px,20px)}}@keyframes glowDrift3{0%,to{opacity:.7;transform:translate(0)}50%{opacity:1;transform:translate(-50px,-40px)}}.bg-shapes{pointer-events:none;z-index:0;position:fixed;inset:0;overflow:hidden}.shape{opacity:0;animation:1.5s ease-out forwards shapeFadeIn;position:absolute}.shape-hex{background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Cpolygon points='60,2 118,31 118,89 60,118 2,89 2,31' fill='rgba(41,121,255,0.03)' stroke='rgba(41,121,255,0.12)' stroke-width='1'/%3E%3C/svg%3E") 50%/contain no-repeat;width:120px;height:120px}.shape-ring{border:1px solid #2979ff1a;border-radius:50%}.shape-dot{background:#2979ff33;border-radius:50%;box-shadow:0 0 20px #2979ff1f}.shape-line{background:linear-gradient(90deg,#0000,#2979ff1f,#0000);height:1px}.shape-1{animation:20s ease-in-out infinite shapeFloat1,1.5s ease-out .2s forwards shapeFadeIn;top:12%;left:8%}.shape-2{width:80px;height:80px;animation:18s ease-in-out infinite shapeFloat2,1.5s ease-out .5s forwards shapeFadeIn;bottom:18%;right:6%}.shape-3{width:180px;height:180px;animation:22s ease-in-out infinite shapeFloat3,1.5s ease-out .3s forwards shapeFadeIn;top:20%;right:12%}.shape-4{width:100px;height:100px;animation:16s ease-in-out infinite reverse shapeFloat1,1.5s ease-out .7s forwards shapeFadeIn;bottom:25%;left:5%}.shape-5{width:6px;height:6px;animation:4s ease-in-out infinite dotPulse,1.5s ease-out .4s forwards shapeFadeIn;top:35%;left:15%}.shape-6{width:4px;height:4px;animation:5s ease-in-out 1s infinite dotPulse,1.5s ease-out .6s forwards shapeFadeIn;top:60%;right:20%}.shape-7{width:5px;height:5px;animation:3.5s ease-in-out .5s infinite dotPulse,1.5s ease-out .8s forwards shapeFadeIn;top:15%;right:30%}.shape-8{width:200px;animation:6s ease-in-out infinite lineGlow8,1.5s ease-out .9s forwards shapeFadeIn;top:45%;left:3%}.shape-9{width:150px;animation:7s ease-in-out 2s infinite lineGlow9,1.5s ease-out 1.1s forwards shapeFadeIn;bottom:35%;right:5%}@keyframes shapeFadeIn{0%{opacity:0}to{opacity:1}}@keyframes shapeFloat1{0%,to{transform:translate(0)rotate(0)}25%{transform:translate(15px,-20px)rotate(5deg)}50%{transform:translate(-10px,10px)rotate(-3deg)}75%{transform:translate(8px,-5px)rotate(2deg)}}@keyframes shapeFloat2{0%,to{transform:translate(0)rotate(0)}33%{transform:translate(-20px,15px)rotate(-8deg)}66%{transform:translate(10px,-10px)rotate(4deg)}}@keyframes shapeFloat3{0%,to{transform:translate(0)}50%{transform:translate(-25px,20px)}}@keyframes dotPulse{0%,to{opacity:.4;transform:scale(1)}50%{opacity:1;transform:scale(1.5)}}@keyframes lineGlow8{0%,to{opacity:.3;transform:rotate(-25deg)}50%{opacity:.8;transform:rotate(-25deg)}}@keyframes lineGlow9{0%,to{opacity:.3;transform:rotate(35deg)}50%{opacity:.8;transform:rotate(35deg)}}.bg-scanline{z-index:0;pointer-events:none;opacity:.6;background:linear-gradient(90deg,#0000,#2979ff33,#0000);height:2px;animation:8s linear infinite scanDown;position:fixed;top:0;left:0;right:0}@keyframes scanDown{0%{top:-2px}to{top:100%}}.header{z-index:100;-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color);background:#f8fafcd9;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;max-width:1200px;height:64px;margin:0 auto;padding:0 24px;display:flex}.logo-group{align-items:center;gap:12px;display:flex}.logo-icon svg{width:40px;height:40px;display:block}.logo-img{object-fit:contain;width:40px;height:40px;display:block}.logo-sub{color:var(--text-muted);-webkit-text-fill-color:var(--text-muted);margin-left:2px;font-size:.78rem;font-weight:400}.logo-text{letter-spacing:.5px;background:linear-gradient(135deg,#1565c0,#2979ff);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.2rem;font-weight:600}.header-actions{align-items:center;gap:10px;display:flex}.header-user-email{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;max-width:160px;font-size:.82rem;overflow:hidden}.btn-login{border:1px solid var(--border-color);color:var(--text-secondary);font-size:.88rem;font-weight:500;font-family:var(--font-family);cursor:pointer;white-space:nowrap;background:#2979ff0a;border-radius:100px;align-items:center;gap:6px;padding:8px 18px;transition:all .25s;display:inline-flex}.btn-login:hover{border-color:var(--accent);color:var(--accent);background:#2979ff14;box-shadow:0 2px 12px #2979ff1a}.main{z-index:1;flex:1;justify-content:center;align-items:center;padding:40px 24px 60px;display:flex;position:relative}.hero{flex-direction:column;align-items:center;width:100%;max-width:720px;animation:.8s ease-out fadeInUp;display:flex}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.hero-title{text-align:center;background:linear-gradient(135deg,#0d2b5e 0%,#2979ff 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:16px;font-size:2.4rem;font-weight:700;line-height:1.3}.hero-subtitle{color:var(--text-secondary);text-align:center;letter-spacing:.3px;margin-bottom:40px;font-size:1.1rem;font-weight:300}.chat-box{width:100%;margin-bottom:36px}.chat-input-wrapper{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:20px 24px 16px;transition:border-color .3s,box-shadow .3s;box-shadow:0 8px 32px #2979ff0f}.chat-input-wrapper:focus-within{border-color:var(--border-hover);box-shadow:0 0 30px #2979ff1a,0 4px 20px #2979ff0f}.chat-input{width:100%;color:var(--text-primary);font-family:var(--font-family);resize:none;background:0 0;border:none;outline:none;min-height:168px;max-height:500px;font-size:1rem;line-height:1.7;overflow-y:auto}.chat-input-mirror{visibility:hidden;white-space:pre-wrap;word-wrap:break-word;overflow-wrap:break-word;position:absolute;top:-9999px;left:-9999px}.chat-input::placeholder{color:var(--text-muted);line-height:1.7}.chat-actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-top:12px;display:flex}.btn-upload{border-radius:var(--radius-md);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;font-size:.875rem;font-family:var(--font-family);white-space:nowrap;background:#2979ff0a;align-items:center;gap:8px;padding:10px 18px;transition:all .25s;display:inline-flex}.btn-upload:hover{border-color:var(--border-hover);color:var(--accent);background:#2979ff14}.btn-send{border-radius:var(--radius-md);background:var(--gradient-accent);color:#fff;cursor:pointer;font-size:.95rem;font-weight:500;font-family:var(--font-family);white-space:nowrap;border:none;align-items:center;gap:8px;padding:12px 28px;transition:all .25s;display:inline-flex;box-shadow:0 4px 16px #2979ff40}.btn-send:hover{transform:translateY(-1px);box-shadow:0 6px 24px #2979ff59}.btn-send:active{transform:translateY(0)}.file-preview{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.file-chip{border-radius:var(--radius-sm);color:var(--accent);background:#2979ff14;border:1px solid #2979ff26;align-items:center;gap:10px;padding:6px 10px 6px 14px;font-size:.8rem;animation:.3s ease-out fadeInUp;display:inline-flex}.file-chip-preview{object-fit:cover;border-radius:4px;flex-shrink:0;width:40px;height:40px}.file-chip-remove{cursor:pointer;opacity:.6;color:var(--accent);background:#2979ff14;border:none;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;font-size:1rem;line-height:1;transition:opacity .2s;display:inline-flex}.file-chip-remove:hover{opacity:1}.quick-tags{flex-direction:column;align-items:center;gap:14px;display:flex}.quick-tags-label{color:var(--text-muted);letter-spacing:.5px;font-size:.85rem;font-weight:400}.quick-tags-list{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.tag-btn{border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;font-size:.85rem;font-family:var(--font-family);white-space:nowrap;background:#fff9;border-radius:100px;padding:8px 18px;transition:all .25s}.tag-btn:hover{border-color:var(--accent);color:var(--accent);background:#2979ff14;box-shadow:0 2px 12px #2979ff1f}.tag-btn:active{transform:scale(.97)}.footer{text-align:center;color:var(--text-muted);z-index:1;border-top:1px solid #2979ff14;margin-top:auto;padding:20px 24px;font-size:.8rem;position:relative}#app{flex-direction:column;min-height:100vh;display:flex}.footer-sep{opacity:.4;margin:0 6px}.footer-icp{color:var(--text-muted);text-decoration:none;transition:color .2s}.footer-icp:hover{color:var(--accent)}@media (width<=768px){.header-inner{height:56px;padding:0 16px}.header-user-email{display:none}.logo-icon svg,.logo-img{width:34px;height:34px}.logo-text{font-size:1.05rem}.main{align-items:flex-start;padding:48px 16px 40px}.hero-title{font-size:1.65rem}.hero-subtitle{margin-bottom:28px;font-size:.95rem}.chat-input-wrapper{border-radius:var(--radius-lg);padding:16px 18px 14px}.chat-input{min-height:108px;font-size:.95rem}.chat-actions{flex-direction:column;align-items:stretch;gap:10px}.btn-upload{justify-content:center;font-size:.82rem}.btn-send{justify-content:center;padding:12px 20px}.tag-btn{padding:7px 14px;font-size:.8rem}.quick-tags-list{gap:8px}.shape-hex{width:80px;height:80px}.shape-ring{width:80px!important;height:80px!important}.shape-line,.bg-glow-3{display:none}}@media (width<=480px){.hero-title{font-size:1.4rem}.hero-subtitle{margin-bottom:24px;font-size:.88rem}.bg-glow{width:400px;height:400px}}@media (width>=1200px){.hero-title{font-size:2.8rem}.hero-subtitle{font-size:1.2rem}}