:root{--primary:#4f46e5;--primary-light:#6366f1;--primary-dark:#4338ca;--primary-bg:#eef2ff;--bg:#f8fafc;--bg-secondary:#f1f5f9;--card-bg:#fff;--card-border:#e2e8f0;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--text-inverse:#fff;--success:#10b981;--warning:#f59e0b;--error:#ef4444;--info:#3b82f6;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--nav-width:240px;--header-height:60px;--bottom-nav-height:64px;--transition-fast:.15s ease;--transition-normal:.25s ease;--transition-slow:.35s ease;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-mono:"SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background-color:var(--bg);color:var(--text-primary);width:100vw;height:100dvh;line-height:1.6;overflow:hidden}#root{width:100vw;height:100dvh;overflow:hidden}a{color:var(--primary);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--primary-dark)}button{font-family:var(--font-sans);cursor:pointer;font-size:inherit;background:0 0;border:none}input,textarea,select{font-family:var(--font-sans);font-size:inherit}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes 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var(--card-border);align-items:center;gap:12px;padding:20px;display:flex}.sidebar-logo{background:linear-gradient(135deg, var(--primary), var(--primary-light));border-radius:var(--radius-md);color:#fff;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:20px;font-weight:700;display:flex}.sidebar-title{color:var(--text-primary);font-size:18px;font-weight:700}.sidebar-subtitle{color:var(--text-muted);font-size:12px}.nav-list{flex:1;padding:12px 8px;list-style:none;overflow-y:auto}.nav-item{margin-bottom:2px}.nav-link{border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition-fast);align-items:center;gap:12px;padding:10px 14px;font-size:14px;font-weight:500;text-decoration:none;display:flex}.nav-link:hover{background:var(--bg-secondary);color:var(--text-primary)}.nav-link.active{background:var(--primary-bg);color:var(--primary);font-weight:600}.nav-link 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var(--transition-fast);flex-direction:column;justify-content:center;align-items:center;gap:2px;min-width:56px;padding:6px 12px;font-size:11px;font-weight:500;text-decoration:none;display:flex}.bottom-nav-link:hover{color:var(--text-secondary)}.bottom-nav-link.active{color:var(--primary)}.bottom-nav-link .nav-icon{width:22px;height:22px}.chat-container{flex-direction:column;height:100%;display:flex}.chat-messages{flex-direction:column;flex:1;gap:16px;padding:24px;display:flex;overflow-y:auto}.welcome-section{text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:40px 20px;animation:.5s fadeIn;display:flex}.welcome-avatar{background:linear-gradient(135deg, var(--primary), var(--primary-light));border-radius:var(--radius-xl);color:#fff;width:72px;height:72px;box-shadow:var(--shadow-lg);justify-content:center;align-items:center;margin-bottom:16px;font-size:32px;font-weight:700;display:flex}.welcome-title{color:var(--text-primary);margin-bottom:8px;font-size:24px;font-weight:700}.welcome-desc{color:var(--text-secondary);max-width:400px;font-size:14px;line-height:1.6}.quick-actions{flex-wrap:wrap;justify-content:center;gap:8px;max-width:500px;margin-top:24px;display:flex}.quick-action-btn{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-full);color:var(--text-secondary);transition:all var(--transition-fast);cursor:pointer;align-items:center;gap:6px;padding:8px 16px;font-size:13px;display:flex}.quick-action-btn:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-bg);box-shadow:var(--shadow-sm);transform:translateY(-1px)}.quick-action-btn 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var(--card-border);border-bottom-left-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}.typing-indicator{align-items:center;gap:4px;padding:12px 16px;display:flex}.typing-indicator span{background:var(--text-muted);border-radius:var(--radius-full);width:8px;height:8px;animation:1.4s infinite typingDot}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}.chat-input-area{background:var(--card-bg);border-top:1px solid var(--card-border);align-items:flex-end;gap:12px;padding:16px 24px;display:flex}.chat-input-wrapper{flex:1;position:relative}.chat-input{border:1px solid var(--card-border);border-radius:var(--radius-lg);background:var(--bg);width:100%;color:var(--text-primary);resize:none;transition:border-color var(--transition-fast), box-shadow var(--transition-fast);outline:none;min-height:44px;max-height:120px;padding:12px 16px;font-size:14px;line-height:1.5}.chat-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.chat-input::placeholder{color:var(--text-muted)}.send-btn{background:var(--primary);color:#fff;border-radius:var(--radius-md);width:44px;height:44px;transition:all var(--transition-fast);flex-shrink:0;justify-content:center;align-items:center;display:flex}.send-btn:hover{background:var(--primary-dark);transform:scale(1.05)}.send-btn:disabled{background:var(--text-muted);cursor:not-allowed;transform:none}.send-btn .btn-icon{width:20px;height:20px}.campus-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;padding:24px;display:grid}.service-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-normal);color:inherit;padding:24px;text-decoration:none;display:block}.service-card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary-light);transform:translateY(-4px)}.service-card-icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:48px;height:48px;margin-bottom:16px;font-size:24px;display:flex}.service-card-title{color:var(--text-primary);margin-bottom:8px;font-size:16px;font-weight:600}.service-card-desc{color:var(--text-secondary);font-size:13px;line-height:1.5}.page-header{padding:24px 24px 0}.page-title{color:var(--text-primary);margin-bottom:4px;font-size:22px;font-weight:700}.page-desc{color:var(--text-secondary);font-size:14px}.map-container{flex-direction:column;gap:16px;padding:24px;display:flex}.map-search{gap:12px;display:flex}.map-search-input{border:1px solid var(--card-border);border-radius:var(--radius-md);background:var(--card-bg);color:var(--text-primary);transition:border-color 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var(--card-border);border-radius:var(--radius-lg);text-align:center;padding:20px}.stat-value{color:var(--primary);margin-bottom:4px;font-size:28px;font-weight:700}.stat-label{color:var(--text-secondary);font-size:13px}.grades-filter{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.filter-btn{border-radius:var(--radius-full);color:var(--text-secondary);background:var(--card-bg);border:1px solid var(--card-border);transition:all var(--transition-fast);padding:6px 16px;font-size:13px}.filter-btn:hover{border-color:var(--primary-light);color:var(--primary)}.filter-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.grades-table{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);overflow:hidden}.grade-row{border-bottom:1px solid var(--card-border);transition:background var(--transition-fast);grid-template-columns:2fr 1fr 1fr 1fr 1fr;align-items:center;padding:14px 20px;font-size:14px;display:grid}.grade-row:last-child{border-bottom:none}.grade-row:hover{background:var(--bg-secondary)}.grade-row.header{background:var(--bg-secondary);color:var(--text-secondary);font-size:13px;font-weight:600}.grade-row.header:hover{background:var(--bg-secondary)}.grade-badge{border-radius:var(--radius-full);padding:2px 10px;font-size:12px;font-weight:600;display:inline-block}.grade-badge.excellent{color:#065f46;background:#d1fae5}.grade-badge.good{color:#1e40af;background:#dbeafe}.grade-badge.pass{color:#92400e;background:#fef3c7}.grade-badge.fail{color:#991b1b;background:#fee2e2}.grade-distribution{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);margin-top:24px;padding:20px}.grade-distribution-title{color:var(--text-primary);margin-bottom:16px;font-size:15px;font-weight:600}.bar-chart{flex-direction:column;gap:12px;display:flex}.bar-item{align-items:center;gap:12px;display:flex}.bar-label{width:60px;color:var(--text-secondary);text-align:right;flex-shrink:0;font-size:13px}.bar-track{background:var(--bg-secondary);border-radius:var(--radius-full);flex:1;height:24px;overflow:hidden}.bar-fill{border-radius:var(--radius-full);color:#fff;align-items:center;height:100%;padding-left:8px;font-size:11px;font-weight:600;transition:width .8s;display:flex}.library-container{flex-direction:column;gap:20px;padding:24px;display:flex}.library-search{gap:12px;display:flex}.library-search-input{border:1px solid var(--card-border);border-radius:var(--radius-md);background:var(--card-bg);color:var(--text-primary);transition:border-color var(--transition-fast);outline:none;flex:1;padding:10px 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var(--transition-fast);gap:16px;padding:16px;display:flex}.book-card:hover{box-shadow:var(--shadow-md);border-color:var(--primary-light)}.book-cover{border-radius:var(--radius-sm);background:var(--bg-secondary);width:60px;height:80px;color:var(--text-muted);flex-shrink:0;justify-content:center;align-items:center;display:flex}.book-info{flex:1;min-width:0}.book-title{color:var(--text-primary);margin-bottom:4px;font-size:14px;font-weight:600}.book-author{color:var(--text-secondary);margin-bottom:8px;font-size:12px}.book-meta{align-items:center;gap:12px;display:flex}.book-status{border-radius:var(--radius-full);align-items:center;gap:4px;padding:2px 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var(--transition-normal);padding:20px}.news-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.news-card-header{align-items:center;gap:8px;margin-bottom:8px;display:flex}.news-tag{border-radius:var(--radius-full);padding:2px 8px;font-size:11px;font-weight:600}.news-tag.news{color:#92400e;background:#fef3c7}.news-tag.notice{color:#1e40af;background:#dbeafe}.news-tag.activity{color:#9d174d;background:#fce7f3}.news-tag.academic{color:#065f46;background:#d1fae5}.news-date{color:var(--text-muted);font-size:12px}.news-card-title{color:var(--text-primary);margin-bottom:8px;font-size:16px;font-weight:600;line-height:1.4}.news-card-summary{color:var(--text-secondary);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:13px;line-height:1.6;display:-webkit-box;overflow:hidden}.news-modal-overlay{z-index:1000;background:#00000080;justify-content:center;align-items:center;padding:20px;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.news-modal{background:var(--card-bg);border-radius:var(--radius-lg);width:100%;max-width:600px;max-height:80vh;padding:32px;animation:.3s scaleIn;overflow-y:auto}.news-modal-close{border-radius:var(--radius-full);width:32px;height:32px;color:var(--text-muted);transition:all var(--transition-fast);justify-content:center;align-items:center;display:flex;position:absolute;top:16px;right:16px}.news-modal-close:hover{background:var(--bg-secondary);color:var(--text-primary)}.news-modal-title{color:var(--text-primary);margin-bottom:12px;font-size:20px;font-weight:700;line-height:1.4}.news-modal-meta{color:var(--text-muted);align-items:center;gap:12px;margin-bottom:20px;font-size:13px;display:flex}.news-modal-content{color:var(--text-primary);font-size:14px;line-height:1.8}.markdown-content{color:var(--text-primary);font-size:14px;line-height:1.7}.markdown-content p{margin-bottom:8px}.markdown-content p:last-child{margin-bottom:0}.markdown-content h1,.markdown-content h2,.markdown-content h3,.markdown-content h4{margin-top:16px;margin-bottom:8px;font-weight:600}.markdown-content h1{font-size:20px}.markdown-content h2{font-size:18px}.markdown-content h3{font-size:16px}.markdown-content ul,.markdown-content ol{margin:8px 0;padding-left:24px}.markdown-content li{margin-bottom:4px}.markdown-content code{background:var(--bg-secondary);border-radius:var(--radius-sm);font-family:var(--font-mono);padding:2px 6px;font-size:13px}.markdown-content pre{color:#e2e8f0;border-radius:var(--radius-md);background:#1e293b;margin:12px 0;padding:16px;overflow-x:auto}.markdown-content pre code{color:inherit;background:0 0;padding:0;font-size:13px}.markdown-content blockquote{border-left:3px solid var(--primary);color:var(--text-secondary);margin:12px 0;padding-left:12px}.markdown-content a{color:var(--primary);text-decoration:underline}.markdown-content table{border-collapse:collapse;width:100%;margin:12px 0}.markdown-content th,.markdown-content 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