: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", 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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), 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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 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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.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 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var(--card-border);background:#f9fafb;border-radius:12px;justify-content:center;align-items:center;width:280px;height:280px;margin:0 auto 16px;display:flex;overflow:hidden}.edu-login-qr-container img{object-fit:contain;width:100%;height:100%}.edu-login-hint{color:var(--text-muted);margin-bottom:20px;font-size:13px}.edu-login-actions{justify-content:center;gap:12px;display:flex}.edu-login-btn{border:1px solid var(--card-border);color:var(--text-secondary);cursor:pointer;background:#fff;border-radius:8px;align-items:center;gap:6px;padding:8px 20px;font-size:14px;transition:all .2s;display:flex}.edu-login-btn:hover{background:var(--bg-secondary)}.edu-login-btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}.edu-login-btn.primary:hover{background:#4338ca}.edu-login-status{flex-direction:column;align-items:center;gap:12px;padding:24px;display:flex}.edu-login-status.success{color:#059669}.edu-login-status.success 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var(--card-border);color:var(--text-muted);cursor:pointer;background:#fff;border-radius:6px;align-items:center;gap:4px;padding:4px 12px;font-size:12px;transition:all .2s;display:inline-flex}.refresh-btn:hover{border-color:var(--primary);color:var(--primary)}.refresh-btn.spinning svg{animation:1s linear infinite spin}