:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--draw-primary:#f97316;--draw-gradient:linear-gradient(135deg,#fb923c 0%,#ea580c 100%);--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6}.container{width:100%;max-width:1400px;margin:0 auto;padding:0 20px}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:15px}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700}.logo span{color:var(--success-color)}nav ul{display:flex;list-style:none;gap:25px}nav a{color:white;text-decoration:none;font-weight:600;font-size:1.1rem;padding:8px 12px;border-radius:6px;transition:var(--transition)}nav a:hover,nav a.active{background-color:rgba(255,255,255,0.2)}main{padding:40px 0}.section-title{font-size:1.8rem;margin-bottom:25px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.section-title i{color:var(--accent-color)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-bottom:40px}.tool-card{background:white;border-radius:var(--border-radius);padding:25px;box-shadow:var(--box-shadow);transition:var(--transition);cursor:pointer;border:2px solid transparent}.tool-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.tool-card i{font-size:2.5rem;color:var(--primary-color);margin-bottom:15px}.tool-card h3{font-size:1.4rem;margin-bottom:10px;color:var(--dark-color)}.tool-card p{color:var(--gray-color);margin-bottom:20px}.use-tool-btn{background-color:var(--primary-color);color:white;border:none;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);width:100%}.use-tool-btn:hover{background-color:var(--secondary-color)}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-top:30px;display:none}.tool-detail.active{display:block}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid #f0f2f5}.tool-header h2{font-size:1.6rem;color:var(--secondary-color)}.close-tool{background:none;border:none;font-size:1.5rem;color:var(--gray-color);cursor:pointer;transition:var(--transition)}.close-tool:hover{color:var(--warning-color)}.drawboard-workspace{display:flex;flex-direction:column;gap:20px}.toolbar{background:white;border:1px solid #e2e8f0;border-radius:12px;padding:15px 20px;display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between;box-shadow:0 2px 8px rgba(0,0,0,0.05)}.tool-group{display:flex;align-items:center;gap:15px;flex-wrap:wrap}.tool-label{font-size:0.9rem;font-weight:700;color:var(--gray-color);margin-right:5px}.color-picker-wrapper{display:flex;gap:8px;align-items:center}.color-swatch{width:28px;height:28px;border-radius:50%;cursor:pointer;border:2px solid transparent;transition:var(--transition);box-shadow:0 2px 4px rgba(0,0,0,0.1)}.color-swatch:hover{transform:scale(1.1)}.color-swatch.active{border-color:var(--dark-color);transform:scale(1.15)}input[type="color"]{width:36px;height:36px;border:none;background:none;cursor:pointer;padding:0}input[type="range"]{width:100px;-webkit-appearance:none;height:6px;background:#e2e8f0;border-radius:5px;outline:none}input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--draw-primary);cursor:pointer}.icon-btn{width:40px;height:40px;border:1px solid #e2e8f0;background:white;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--gray-color);cursor:pointer;transition:var(--transition);font-size:1.1rem}.icon-btn:hover{background:#fff7ed;border-color:var(--draw-primary);color:var(--draw-primary)}.icon-btn.active{background:var(--draw-primary);color:white;border-color:var(--draw-primary)}.action-btn{padding:8px 16px;background:var(--draw-gradient);color:white;border:none;border-radius:8px;cursor:pointer;font-weight:600;display:flex;align-items:center;gap:6px;transition:var(--transition)}.action-btn:hover{box-shadow:0 4px 12px rgba(249,115,22,0.3);transform:translateY(-1px)}.action-btn.secondary{background:transparent;color:var(--gray-color);border:1px solid #e2e8f0}.action-btn.secondary:hover{color:var(--warning-color);border-color:var(--warning-color);background:#fff1f2}.canvas-container{background:#e5e7eb;border-radius:12px;overflow:hidden;display:flex;justify-content:center;align-items:center;position:relative;cursor:crosshair;min-height:500px;box-shadow:inset 0 0 20px rgba(0,0,0,0.05)}canvas{background:white;box-shadow:0 10px 30px rgba(0,0,0,0.15);touch-action:none}@media (max-width:768px){.toolbar{flex-direction:column;align-items:stretch}.tool-group{justify-content:space-between}.canvas-container{min-height:400px}}