:root{--primary-color:#0052d9;--primary-hover:#003cab;--primary-light:#e3efff;--secondary-color:#00a3ff;--gradient-primary:linear-gradient(135deg, #0052d9 0%, #00a3ff 100%);--gradient-light:linear-gradient(135deg, #f0f6ff 0%, #e3efff 100%);--bg-color:#f5f7fa;--card-bg:#fff;--border-color:#e5e6eb;--border-focus:#0052d9;--text-primary:#1d2129;--text-secondary:#4e5969;--text-tertiary:#86909c;--text-blue:#0052d9;--success-color:#00a870;--success-bg:#e8f8f2;--warning-color:#ed7b2f;--warning-bg:#fef3eb;--danger-color:#e34d59;--danger-bg:#fdebfa;--radius-sm:6px;--radius-md:12px;--radius-lg:20px;--shadow-default:0 4px 16px #0052d908, 0 1px 4px #00000005;--shadow-hover:0 12px 32px #0052d914, 0 2px 12px #00000008;--shadow-glow:0 0 20px #0052d933;--font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;line-height:1.5;overflow-x:hidden}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#c9cdd4;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.app-container{flex-direction:column;min-height:100vh;display:flex}.main-content{flex:1;width:100%;max-width:1440px;margin:0 auto;padding:24px}.tech-card{background-color:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-default);padding:24px;transition:all .3s cubic-bezier(.25,.8,.25,1);position:relative;overflow:hidden}.tech-card:hover{box-shadow:var(--shadow-hover);border-color:#0052d933;transform:translateY(-4px)}.tech-card:before{content:"";background:var(--gradient-primary);width:4px;height:0;transition:height .3s;position:absolute;top:0;left:0}.tech-card:hover:before{height:100%}.btn{border-radius:var(--radius-sm);cursor:pointer;-webkit-user-select:none;user-select:none;border:1px solid #0000;justify-content:center;align-items:center;padding:10px 20px;font-size:14px;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:0 4px 10px #0052d933}.btn-primary:hover{filter:brightness(1.1);box-shadow:0 6px 14px #0052d94d}.btn-primary:active{filter:brightness(.9)}.btn-primary:disabled{color:#86909c;cursor:not-allowed;box-shadow:none;background:#c9cdd4}.btn-secondary{background-color:var(--card-bg);border-color:var(--primary-color);color:var(--primary-color)}.btn-secondary:hover{background-color:var(--primary-light)}.btn-text{color:var(--primary-color);background:0 0}.btn-text:hover{background-color:var(--primary-light)}.form-group{margin-bottom:20px}.form-label{color:var(--text-secondary);margin-bottom:8px;font-size:14px;font-weight:500;display:block}.form-label.required:after{content:" *";color:var(--danger-color)}.form-control{border:1px solid var(--border-color);width:100%;color:var(--text-primary);border-radius:var(--radius-sm);background-color:#fff;outline:none;padding:12px 16px;font-size:14px;transition:all .2s}.form-control:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #0052d91a}.form-control.error{border-color:var(--danger-color)}.form-control.error:focus{box-shadow:0 0 0 3px #e34d591a}.error-message{color:var(--danger-color);margin-top:4px;font-size:12px}.grid-2{grid-template-columns:repeat(2,1fr);gap:24px;display:grid}.grid-3{grid-template-columns:repeat(3,1fr);gap:24px;display:grid}.grid-4{grid-template-columns:repeat(4,1fr);gap:20px;display:grid}@media (width<=992px){.grid-3,.grid-4,.grid-2{grid-template-columns:1fr}}@keyframes pulseGlow{0%{box-shadow:0 0 5px #0052d91a}50%{box-shadow:0 0 15px #0052d94d}to{box-shadow:0 0 5px #0052d91a}}.glow-effect{animation:2s infinite pulseGlow}.pdf-nav-btn{transition:all .2s!important}.pdf-nav-btn:hover{background-color:#f5f7fa!important}.pdf-nav-btn:active{background-color:#e5e6eb!important}