:root{--primary: #0f172a;--primary-light: #1e293b;--accent: #d97706;--accent-hover: #b45309;--accent-light: rgba(217, 119, 6, .08);--bg-body: #f8fafc;--surface: #ffffff;--border: #e2e8f0;--text-main: #334155;--text-light: #64748b;--gradient-subtle: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);--gradient-radial: radial-gradient(ellipse at top, #f8fafc 0%, #e2e8f0 100%);--font-xs: .75rem;--font-sm: .875rem;--font-base: 1rem;--font-lg: 1.125rem;--font-xl: 1.25rem;--font-2xl: 1.5rem;--font-3xl: 2rem;--radius-md: 12px;--radius-lg: 16px;--header-height: 64px;--transition-fast: .15s ease-out;--transition-base: .25s ease-out;--transition-slow: .4s ease-out}*{box-sizing:border-box;margin:0;padding:0;outline:none}body{font-family:Inter,sans-serif;background-color:var(--bg-body);color:var(--text-main);height:100dvh;display:flex;flex-direction:column;overflow:hidden}#root{height:100%;display:flex;flex-direction:column}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .4s ease-out}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.spin{animation:spin 1s linear infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.cursor{display:inline-block;width:2px;height:1em;background:var(--primary);animation:blink 1s infinite;vertical-align:text-bottom}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.stagger-1{animation:slideUp .5s var(--transition-base) forwards;animation-delay:.1s;opacity:0}.stagger-2{animation:slideUp .5s var(--transition-base) forwards;animation-delay:.2s;opacity:0}.stagger-3{animation:slideUp .5s var(--transition-base) forwards;animation-delay:.3s;opacity:0}.stagger-4{animation:slideUp .5s var(--transition-base) forwards;animation-delay:.4s;opacity:0}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-light)}.loading-screen .loading-icon{font-size:3rem;color:var(--accent);margin-bottom:16px;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.login-page{position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at top right,#e2e8f0,#f8fafc);display:flex;align-items:center;justify-content:center;z-index:9999}.login-card{background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:48px;border-radius:24px;box-shadow:0 20px 40px -10px #0f172a1a;width:100%;max-width:420px;border:1px solid rgba(255,255,255,.5)}.brand-logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:32px;color:var(--primary)}.brand-logo i{font-size:2rem;color:var(--accent)}.brand-logo h1{font-size:1.5rem;font-weight:700;letter-spacing:-.5px}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:500;font-size:.9rem;color:var(--text-main)}.form-input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius-md);font-size:1rem;transition:all .2s;background:#f8fafc}.form-input:focus{background:#fff;border-color:var(--primary);box-shadow:0 0 0 3px #0f172a1a}.btn-primary{width:100%;padding:14px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-md);font-weight:600;font-size:1rem;cursor:pointer;transition:transform .1s,background .2s;display:flex;align-items:center;justify-content:center;gap:8px}.btn-primary:hover{background:#020617}.btn-primary:active{transform:scale(.98)}.btn-primary:disabled{opacity:.7;cursor:wait}.error-msg{background:#fee2e2;color:#991b1b;padding:12px;border-radius:8px;margin-bottom:20px;font-size:.9rem;text-align:center}.login-footer{text-align:center;margin-top:24px;font-size:.85rem;color:#94a3b8}.app-container{display:flex;height:100%;width:100%}.overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;z-index:90}.overlay.active{display:block}.sidebar{width:280px;background:var(--primary);color:#94a3b8;display:flex;flex-direction:column;border-right:1px solid rgba(255,255,255,.1);transition:transform .3s ease;z-index:100;flex-shrink:0}.sidebar-header{padding:20px;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-brand{justify-content:flex-start;font-size:1.2rem;margin-bottom:20px;color:#fff}.sidebar-brand i{font-size:1.4rem}.new-chat-btn{width:100%;padding:12px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:background .2s}.new-chat-btn:hover{background:var(--accent-hover)}.history-list{flex:1;overflow-y:auto;padding:16px 12px}.history-item{padding:12px;border-radius:8px;cursor:pointer;margin-bottom:4px;display:flex;align-items:center;gap:10px;transition:background .2s}.history-item:hover{background:#ffffff0d;color:#fff}.history-item.active{background:#ffffff1a;color:#fff}.history-title{font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.delete-icon{opacity:0;color:#ef4444;transition:opacity .2s;padding:4px}.history-item:hover .delete-icon{opacity:1}.user-profile{padding:16px;border-top:1px solid rgba(255,255,255,.1);display:flex;align-items:center;gap:12px;background:#0003}.user-avatar{width:32px;height:32px;background:var(--accent);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;flex-shrink:0}.user-details{flex:1;overflow:hidden}.user-name{color:#fff;font-size:.9rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-quota{font-size:.75rem;opacity:.8;display:flex;align-items:center;gap:6px}.user-quota i{font-size:.7rem}.user-quota.quota-warning{color:#fbbf24;opacity:1}.user-quota.quota-exceeded{color:#ef4444;opacity:1}.quota-error{background:linear-gradient(135deg,#fef2f2,#fee2e2);border:1px solid #fecaca;border-radius:12px;padding:16px;text-align:center;color:#991b1b}.quota-error i{font-size:2rem;margin-bottom:8px;display:block;color:#ef4444}.quota-error strong{display:block;font-size:1.1rem;margin-bottom:8px}.quota-error p{font-size:.9rem;color:#7f1d1d;margin:0}.logout-btn-mini{background:none;border:none;color:#94a3b8;cursor:pointer;font-size:1.1rem;padding:4px}.logout-btn-mini:hover{color:#fff}.main-content{flex:1;display:flex;flex-direction:column;background:#fff;position:relative;min-width:0}.mobile-header{display:none;height:60px;border-bottom:1px solid var(--border);align-items:center;justify-content:space-between;padding:0 16px;background:#fff;flex-shrink:0}.menu-btn{background:none;border:none;font-size:1.2rem;color:var(--primary);cursor:pointer;padding:8px}.mobile-title{font-weight:600;color:var(--primary)}.chat-area{flex:1;overflow-y:auto;padding:40px;scroll-behavior:smooth;background:var(--gradient-subtle)}.msg-row{display:flex;gap:16px;margin-bottom:32px;max-width:900px;margin-left:auto;margin-right:auto}.avatar{width:36px;height:36px;border-radius:8px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:1rem}.avatar.ai{background:var(--primary);color:#fff}.avatar.user{background:var(--border);color:var(--text-light)}.msg-content{flex:1;font-size:1rem;line-height:1.6;color:var(--text-main)}.msg-row.user-row{justify-content:flex-end}.msg-row.user-row .msg-content{background:#f1f5f9;color:var(--primary);padding:12px 20px;border-radius:16px 16px 4px;flex:none;max-width:80%}.msg-content h3{font-size:var(--font-xl);font-weight:700;margin-bottom:8px;color:var(--primary);letter-spacing:-.01em}.msg-content ul{padding-left:20px;margin:10px 0}.msg-content p{margin-bottom:10px}.loading-msg{color:#64748b;font-style:italic}.source-header{font-size:var(--font-sm);font-weight:600;color:var(--text-light);margin-bottom:12px;display:flex;align-items:center;gap:8px}.source-header i{color:var(--accent)}.source-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:12px;margin-top:8px}.source-card{border:1px solid var(--border);border-left:3px solid var(--border);border-radius:12px;padding:16px;background:linear-gradient(135deg,#fff,#fafafa);transition:all var(--transition-base)}.source-card:hover{border-color:var(--accent);border-left-color:var(--accent);background:#fff;box-shadow:0 8px 24px -8px #0000001a;transform:translateY(-2px)}.source-title{font-weight:600;font-size:.95rem;color:var(--primary);margin-bottom:6px;display:flex;align-items:center;gap:8px}.source-title i{color:var(--accent)}.source-meta{font-size:.85rem;color:var(--text-main);margin-bottom:8px;font-weight:500}.source-location{font-size:.8rem;color:var(--accent);margin-bottom:10px;display:flex;align-items:center;gap:6px}.source-snippet{font-size:.82rem;color:#475569;line-height:1.5;margin-bottom:12px;padding:10px 12px;background:#f1f5f9;border-radius:8px;border-left:3px solid var(--accent);font-style:italic}.source-link{font-size:var(--font-sm);font-weight:600;color:var(--accent);text-decoration:none;display:inline-flex;align-items:center;gap:6px;padding:8px 12px;background:var(--accent-light);border:none;border-radius:6px;cursor:pointer;font-family:inherit;transition:all var(--transition-base)}.source-link i{transition:transform var(--transition-base)}.source-link:hover{background:var(--accent);color:#fff}.source-link:hover i{transform:translate(3px)}.source-link.loading{opacity:.7;cursor:wait}.input-wrapper{max-width:900px;margin:0 auto;width:100%;padding:20px;background:#fff;flex-shrink:0}.input-container{background:var(--bg-body);border:1px solid var(--border);border-radius:16px;padding:10px 16px;display:flex;align-items:flex-end;gap:12px;transition:all .2s;box-shadow:0 2px 6px #00000005}.input-container:focus-within{background:#fff;border-color:var(--primary);box-shadow:0 4px 12px #0f172a14}.input-container textarea{flex:1;background:transparent;border:none;resize:none;font-size:1rem;max-height:150px;padding:8px 0;line-height:1.5;color:var(--text-main);font-family:inherit}.input-container textarea:focus{outline:none}.input-container textarea::placeholder{color:#94a3b8}.input-container textarea:disabled{opacity:.6;cursor:not-allowed}.send-btn{background:var(--primary);color:#fff;width:36px;height:36px;border-radius:8px;border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:opacity .2s,background .2s;flex-shrink:0}.send-btn:disabled{opacity:.5;cursor:not-allowed}.send-btn:hover:not(:disabled){background:#020617}.char-counter{text-align:right;font-size:.75rem;color:#94a3b8;margin-top:6px}.disclaimer{text-align:center;font-size:.7rem;color:#cbd5e1;margin-top:8px}.welcome-hero{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 20px;max-width:700px;margin:0 auto;background:var(--gradient-radial);border-radius:24px}.welcome-icon{width:80px;height:80px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);border-radius:20px;display:flex;align-items:center;justify-content:center;font-size:2rem;color:#fff;margin-bottom:24px;box-shadow:0 10px 40px -10px #0f172a4d}.welcome-title{font-size:var(--font-3xl);font-weight:700;color:var(--primary);margin-bottom:12px;letter-spacing:-.02em}.welcome-subtitle{font-size:var(--font-lg);color:var(--text-light);margin-bottom:32px;max-width:500px}.suggestion-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;width:100%;max-width:500px;margin-bottom:32px}.suggestion-chip{display:flex;align-items:center;gap:10px;padding:14px 18px;background:linear-gradient(135deg,#fff,#f8fafc);border:1px solid var(--border);border-radius:12px;cursor:pointer;transition:all var(--transition-base);text-align:left;font-size:var(--font-sm);color:var(--text-main);font-family:inherit}.suggestion-chip:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 24px -8px #d9770633}.suggestion-chip i{color:var(--accent);font-size:1.1rem;flex-shrink:0}.suggestion-chip span{font-weight:500}.capability-pills{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}.capability-pills span{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background:#0f172a0a;border-radius:20px;font-size:var(--font-xs);color:var(--text-light);font-weight:500}.capability-pills span i{color:#22c55e;font-size:.7rem}.doc-type-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:6px;font-size:var(--font-xs);font-weight:600;margin-bottom:8px}.doc-type-badge.doc-luat{background:#3b82f61a;color:#3b82f6}.doc-type-badge.doc-nghidinh{background:#8b5cf61a;color:#8b5cf6}.doc-type-badge.doc-thongtu{background:#14b8a61a;color:#14b8a6}.doc-type-badge.doc-quyetdinh{background:#f973161a;color:#f97316}.doc-type-badge.doc-default{background:#64748b1a;color:#64748b}@media(max-width:768px){.login-card{padding:32px 24px;margin:20px}.sidebar{position:fixed;top:0;bottom:0;left:-100%;width:80%;max-width:300px;box-shadow:10px 0 20px #0000001a}.sidebar.active{left:0}.mobile-header{display:flex}.chat-area{padding:20px 16px}.msg-row.user-row .msg-content{max-width:85%}.input-wrapper{padding:12px 16px}.source-grid{grid-template-columns:1fr}.welcome-hero{padding:40px 16px}.welcome-title{font-size:var(--font-2xl)}.welcome-subtitle{font-size:var(--font-base)}.suggestion-grid{grid-template-columns:1fr;max-width:100%}.capability-pills{gap:8px}.capability-pills span{font-size:.7rem;padding:6px 10px}}