::view-transition-old(root),::view-transition-new(root){animation:none;mix-blend-mode:normal}::view-transition-new(root){z-index:1}::view-transition-old(root){z-index:0}:root{--app-font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--primary-blue: #0284c7;--primary-blue-dark: #0369a1;--primary-blue-light: #38bdf8;--accent-gold: #f59e0b;--accent-gold-dark: #d97706;--role-student: #10b981;--role-external: #8b5cf6;--role-teacher: #ef4444;--bg-primary: #f0f9ff;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-sidebar: #334155;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--text-on-dark: #f8fafc;--border-color: #e2e8f0;--border-light: #f1f5f9;--accent-color: #38bdf8;--accent-hover: #0ea5e9;--accent-soft: #f0f9ff;--glass-bg: rgba(255, 255, 255, .8);--glass-border: rgba(203, 213, 225, .5);--btn-primary-bg: linear-gradient(135deg, #f0f9ff, #e1f2fe);--btn-primary-text: #0284c7;--highlight-bg: rgba(14, 165, 233, .05);--highlight-border: #38bdf8;--highlight-text: #0284c7;--error-bg: #fee2e2;--error-text: #dc2626;--scrollbar-thumb: #cbd5e1;--scrollbar-thumb-hover: #94a3b8;--text-accent: #0369a1;--text-on-dark-secondary: #94a3b8;--welcome-card-bg: linear-gradient(135deg, #0284c7, #0369a1);--welcome-card-text: #ffffff;--page-gradient: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 50%, #ffffff 100%);--card-glass-bg: rgba(255, 255, 255, .6);--card-glass-border: rgba(255, 255, 255, .8);--input-glass-bg: rgba(255, 255, 255, .7);--input-glass-shadow: 0 -2px 12px rgba(0, 0, 0, .03);--collapse-btn-bg: rgba(255, 255, 255, .8);--collapse-btn-border: rgba(0, 0, 0, .08);--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-full: 50%;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .05);--shadow-md: 0 4px 20px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .12);--shadow-glow: 0 0 30px rgba(59, 130, 246, .3);--transition-fast: .2s ease;--transition-normal: .3s ease}.dark-theme{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-card: #1e293b;--bg-sidebar: #020617;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--text-on-dark: #f8fafc;--border-color: #334155;--border-light: #1e293b;--accent-color: #0284c7;--accent-hover: #0369a1;--accent-soft: rgba(2, 132, 199, .1);--glass-bg: rgba(15, 23, 42, .8);--glass-border: rgba(51, 65, 85, .5);--btn-primary-bg: linear-gradient(135deg, #0284c7, #0369a1);--btn-primary-text: #ffffff;--highlight-bg: rgba(2, 132, 199, .2);--highlight-border: #0284c7;--highlight-text: #0284c7;--error-bg: rgba(248, 113, 113, .2);--error-text: #f87171;--scrollbar-thumb: #334155;--scrollbar-thumb-hover: #475569;--text-accent: #0284c7;--text-on-dark-secondary: #64748b;--welcome-card-bg: linear-gradient(135deg, #0284c7, #1e293b);--welcome-card-text: #f1f5f9;--page-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);--card-glass-bg: rgba(30, 41, 59, .6);--card-glass-border: rgba(51, 65, 85, .5);--input-glass-bg: rgba(30, 41, 59, .7);--input-glass-shadow: 0 -2px 12px rgba(0, 0, 0, .2);--collapse-btn-bg: rgba(30, 41, 59, .8);--collapse-btn-border: rgba(51, 65, 85, .5);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .5);--shadow-glow: 0 0 30px rgba(56, 189, 248, .3)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--app-font-family);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}button,input,textarea,select{font:inherit}a{text-decoration:none;color:inherit}ul{list-style:none}.app-scrollbar{scrollbar-width:thin;scrollbar-color:var(--scrollbar-thumb) transparent}.app-scrollbar::-webkit-scrollbar{width:6px;height:6px}.app-scrollbar::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:3px}.app-scrollbar::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb-hover)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;background:linear-gradient(135deg,var(--bg-primary) 0%,var(--primary-blue-dark) 100%)}.login-background{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.bg-circle{position:absolute;border-radius:50%;animation:float 8s ease-in-out infinite}.bg-circle-1{width:500px;height:500px;background:radial-gradient(circle,rgba(59,130,246,.15) 0%,transparent 70%);top:-150px;right:-100px}.bg-circle-2{width:400px;height:400px;background:radial-gradient(circle,rgba(245,158,11,.1) 0%,transparent 70%);bottom:-100px;left:-100px;animation-delay:-3s}.bg-circle-3{width:300px;height:300px;background:radial-gradient(circle,rgba(59,130,246,.1) 0%,transparent 70%);top:50%;left:30%;animation-delay:-5s}@keyframes float{0%,to{transform:translateY(0) scale(1)}50%{transform:translateY(-30px) scale(1.05)}}.login-container{position:relative;z-index:10;width:90%;max-width:520px;background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-lg);animation:slideUp .6s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.login-header{text-align:center;margin-bottom:var(--spacing-lg)}.login-logo{font-size:4rem;margin-bottom:var(--spacing-sm)}.login-header h1{font-size:1.5rem;font-weight:700;margin-bottom:var(--spacing-xs);background:linear-gradient(135deg,var(--text-primary),var(--accent-gold));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.login-header p{color:var(--text-secondary);font-size:.95rem}.login-form{display:flex;flex-direction:column;gap:var(--spacing-md)}.form-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}.form-group label{font-size:.9rem;color:var(--text-secondary);font-weight:500}.form-group input,.form-group select{padding:var(--spacing-sm) var(--spacing-md);background:#0000000d;border:1px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;outline:none;transition:all var(--transition-fast)}.form-group input::placeholder{color:var(--text-muted)}.form-group input:focus,.form-group select:focus{border-color:var(--primary-blue-light);box-shadow:0 0 0 3px #3b82f633}.form-group select{cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1rem center}.form-group select option{background:var(--bg-secondary);color:var(--text-primary)}.login-btn{padding:var(--spacing-sm) var(--spacing-lg);background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-dark));border:none;border-radius:var(--radius-md);color:#fff;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all var(--transition-normal);margin-top:var(--spacing-sm)}.login-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-glow)}.login-btn:disabled{opacity:.6;cursor:not-allowed}.login-tips{text-align:center;margin-top:var(--spacing-sm)}.login-tips p{font-size:.85rem;color:var(--text-muted)}.dashboard{min-height:100vh;background:var(--bg-primary)}.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;padding:var(--spacing-sm) 0;background:#fffffff2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:var(--shadow-md)}.nav-container{max-width:1400px;margin:0 auto;padding:0 var(--spacing-lg);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md)}.logo{display:flex;align-items:center;gap:var(--spacing-sm)}.logo-icon{width:40px;height:40px;background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-dark));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.3rem;box-shadow:var(--shadow-glow)}.logo-text{font-size:1.2rem;font-weight:700;color:var(--primary-blue-dark)}.user-info{display:flex;align-items:center;gap:var(--spacing-sm)}.user-name{font-weight:500;color:var(--text-primary)}.user-role-badge{padding:4px 12px;border-radius:var(--radius-sm);font-size:.8rem;font-weight:600;color:#fff}.logout-btn{padding:6px 16px;background:transparent;border:1px solid var(--glass-border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.85rem;cursor:pointer;transition:all var(--transition-fast)}.logout-btn:hover{background:#0000000d;color:var(--text-primary)}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-md)}.section-title{font-size:1.4rem;font-weight:700;display:flex;align-items:center;gap:var(--spacing-sm)}.title-icon{color:var(--primary-blue-light);font-size:1rem}.more-link{color:var(--text-muted);font-size:.9rem;transition:color var(--transition-fast)}.more-link:hover{color:var(--primary-blue-light)}.service-card{background:#fff;border:1px solid var(--glass-border);border-radius:var(--radius-md);padding:var(--spacing-md);cursor:pointer;transition:all var(--transition-normal);display:flex;flex-direction:column;align-items:center;text-align:center;gap:var(--spacing-sm);box-shadow:var(--shadow-sm)}.service-card:hover{background:var(--bg-primary);transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--primary-blue-light)}.service-icon{font-size:2.5rem}.service-name{font-weight:600;color:var(--text-primary)}.service-desc{font-size:.85rem;color:var(--text-muted)}.chat-toggle-btn{position:fixed;bottom:30px;right:30px;display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-dark));border:none;border-radius:var(--radius-lg);color:#fff;font-size:.95rem;font-weight:600;cursor:pointer;box-shadow:var(--shadow-lg),var(--shadow-glow);transition:all var(--transition-normal);z-index:999}.chat-toggle-btn:hover{transform:translateY(-3px) scale(1.02)}.chat-toggle-btn.active{background:linear-gradient(135deg,var(--primary-blue-dark),#064e7b)}.chat-icon{font-size:1.2rem}.chat-window{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);width:800px;max-width:calc(100vw - 40px);height:80vh;max-height:700px;background:var(--bg-secondary);border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:0 25px 80px #0000004d;display:flex;flex-direction:column;z-index:1001;overflow:hidden}.chat-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-dark))}.chat-header-info{display:flex;align-items:center;gap:var(--spacing-sm)}.chat-avatar{font-size:1.5rem}.chat-header-text h3{font-size:1rem;font-weight:600;color:#fff;margin:0}.chat-status{font-size:.75rem;color:#ffffffb3}.chat-status.offline{color:#fed7aa}.chat-header-actions{display:flex;gap:var(--spacing-xs)}.chat-action-btn{width:32px;height:32px;background:#ffffff1a;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--transition-fast)}.chat-action-btn:hover{background:#fff3}.chat-messages{flex:1;overflow-y:auto;padding:var(--spacing-md);display:flex;flex-direction:column;gap:var(--spacing-md)}.chat-message{display:flex;gap:var(--spacing-sm);max-width:85%}.chat-message.user{align-self:flex-end;flex-direction:row-reverse}.message-avatar{width:36px;height:36px;border-radius:50%;background:var(--glass-bg);display:flex;align-items:center;justify-content:center;flex-shrink:0;overflow:visible}.chat-message.assistant .message-avatar{background:transparent}.message-content{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md)}.chat-message.user .message-content{background:var(--primary-blue);border-color:var(--primary-blue);color:#fff}.chat-message.user .message-text,.chat-message.user .message-file,.chat-message.user .message-time{color:#ffffffe6}.message-text{font-size:.9rem;line-height:1.6;color:var(--text-primary)}.message-files{margin-top:var(--spacing-xs);padding-top:var(--spacing-xs);border-top:1px solid var(--glass-border)}.message-file{font-size:.8rem;color:var(--text-muted)}.message-time{font-size:.7rem;color:var(--text-muted);margin-top:var(--spacing-xs)}.chat-loading{display:flex;gap:4px;padding:var(--spacing-sm)}.loading-dot{width:8px;height:8px;background:var(--text-muted);border-radius:50%;animation:bounce 1s infinite}.loading-dot:nth-child(2){animation-delay:.2s}.loading-dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:translateY(0)}40%{transform:translateY(-8px)}}.uploaded-files{padding:var(--spacing-sm) var(--spacing-md);background:var(--glass-bg);border-top:1px solid var(--glass-border);display:flex;flex-wrap:wrap;gap:var(--spacing-xs)}.uploaded-file{display:flex;align-items:center;gap:4px;padding:4px 8px;background:var(--bg-card);border-radius:var(--radius-sm);font-size:.8rem}.file-icon{font-size:.9rem}.file-name{max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-remove{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:0 4px}.file-remove:hover{color:var(--role-teacher)}.chat-input-area{padding:var(--spacing-md);border-top:1px solid var(--glass-border);display:flex;gap:var(--spacing-sm);align-items:flex-end}.file-upload .upload-btn{width:40px;height:40px;background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-sm);cursor:pointer;font-size:1.2rem;transition:all var(--transition-fast)}.file-upload .upload-btn:hover:not(:disabled){background:#ffffff1a}.chat-input-wrapper{flex:1;display:flex;gap:var(--spacing-sm)}.chat-input-wrapper textarea{flex:1;padding:var(--spacing-sm);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:.9rem;resize:none;outline:none;min-height:40px;max-height:100px}.chat-input-wrapper textarea:focus{border-color:var(--primary-blue-light)}.chat-input-wrapper textarea::placeholder{color:var(--text-muted)}.send-btn{padding:var(--spacing-sm) var(--spacing-md);background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-dark));border:none;border-radius:var(--radius-sm);color:#fff;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.send-btn:hover:not(:disabled){box-shadow:var(--shadow-glow)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.system-notice-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:2000;display:flex;align-items:center;justify-content:center;padding:24px;background:#0f172a6b;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.system-notice-dialog{width:min(420px,100%);background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:0 24px 70px #0f172a47;padding:24px}.system-notice-header{display:flex;align-items:center;gap:14px;margin-bottom:16px}.system-notice-icon{width:40px;height:40px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;background:#fff7ed;color:#c2410c;border:1px solid #fed7aa;font-weight:800}.system-notice-label{margin:0 0 2px;color:var(--text-muted);font-size:.78rem}.system-notice-header h2{margin:0;font-size:1.15rem;line-height:1.35}.system-notice-message{margin:0;color:var(--text-secondary);line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere}.system-notice-detail{margin:12px 0 0;padding:10px 12px;background:var(--accent-soft);border:1px solid var(--glass-border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.88rem;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere}.system-notice-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap;margin-top:22px}.system-notice-btn{padding:9px 18px;border:none;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-dark));color:#fff;font-weight:600}.system-notice-btn.secondary{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-secondary)}.system-notice-fade-enter-active,.system-notice-fade-leave-active{transition:opacity .2s ease}.system-notice-fade-enter-from,.system-notice-fade-leave-to{opacity:0}.chat-slide-enter-from,.chat-slide-leave-to{opacity:0;transform:translateY(20px) scale(.95)}@media(max-width:768px){.user-info{display:none}.chat-window{width:calc(100vw - 20px);height:calc(100vh - 100px);max-height:none}.chat-toggle-btn{right:15px;bottom:15px}.chat-text{display:none}.chat-message{max-width:100%;width:100%;gap:0}.chat-message.user{max-width:100%}.message-avatar{display:none}.message-content{min-width:0;max-width:100%;padding:10px 12px;border-radius:14px;overflow-wrap:anywhere}.chat-message.user .message-content{margin-left:auto}.message-text{font-size:.88rem;line-height:1.65}}.fade-enter-active,.fade-leave-active{transition:opacity .3s ease}.fade-enter-from,.fade-leave-to{opacity:0}.chat-slide-enter-active,.chat-slide-leave-active{transition:all .3s ease}.chat-slide-enter-from,.chat-slide-leave-to{opacity:0;transform:translate(-50%,-50%) scale(.9)}