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label{font-weight:500;color:var(--text-color)}.indent-select select{padding:.5rem 1rem;border:1px solid var(--border-color);border-radius:6px;font-size:1rem}.minify-options{display:flex;flex-wrap:wrap;gap:1.5rem}.option-checkbox{display:flex;align-items:center;gap:.5rem;cursor:pointer;font-size:.95rem}.option-checkbox input[type=checkbox]{width:18px;height:18px;cursor:pointer}.sample-buttons{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;flex-wrap:wrap}.sample-buttons span{font-weight:500;color:var(--text-light)}.sample-buttons button{padding:.5rem 1rem;border:1px solid var(--border-color);background:#fff;border-radius:6px;cursor:pointer;font-size:.875rem;transition:all .2s ease}.sample-buttons button:hover{border-color:var(--primary-color);color:var(--primary-color)}.editor-container{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1.5rem}.editor-panel{background:#fff;border-radius:12px;box-shadow:0 2px 8px #0000001a;overflow:hidden}.panel-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.25rem;background:#f8f9fa;border-bottom:1px solid var(--border-color)}.panel-header h3{margin:0;font-size:1rem;color:var(--text-color)}.panel-actions{display:flex;align-items:center;gap:1rem}.char-count{font-size:.85rem;color:var(--text-light)}.clear-btn,.copy-btn{padding:.4rem .8rem;border:none;border-radius:4px;font-size:.85rem;cursor:pointer;transition:all .2s ease}.clear-btn{background:#f0f0f0;color:var(--text-color)}.clear-btn:hover{background:#e0e0e0}.copy-btn{background:var(--primary-color);color:#fff}.copy-btn:hover:not(:disabled){opacity:.9}.copy-btn:disabled{opacity:.5;cursor:not-allowed}.editor-panel textarea{width:100%;height:400px;padding:1rem;border:none;resize:vertical;font-family:Consolas,Monaco,Courier New,monospace;font-size:.875rem;line-height:1.6;background:#1e1e1e;color:#d4d4d4}.editor-panel textarea:focus{outline:none}.editor-panel textarea::placeholder{color:#999}.error-display{background:#fff5f5;border:1px solid #fed7d7;border-radius:8px;padding:1rem;margin-bottom:1rem}.error-display h4{color:#c53030;margin:0 0 .5rem;font-size:.95rem}.error-display pre{margin:0;font-family:Consolas,monospace;font-size:.875rem;color:#c53030;white-space:pre-wrap}.stats-display{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:2rem}.stat-item{background:#fff;border-radius:8px;padding:1rem 1.5rem;box-shadow:0 2px 8px #0000001a;display:flex;flex-direction:column;gap:.25rem;min-width:120px}.stat-label{font-size:.85rem;color:var(--text-light)}.stat-value{font-size:1.25rem;font-weight:700;color:var(--text-color)}.stat-value.positive{color:#38a169}.stat-value.negative{color:#e53e3e}.history-section{background:#fff;border-radius:12px;padding:1.5rem;margin-bottom:2rem;box-shadow:0 2px 8px #0000001a}.history-section h3{font-size:1.15rem;font-weight:700;color:var(--gray-900);margin-bottom:1.25rem;padding-bottom:.75rem;border-bottom:2px solid var(--primary);letter-spacing:.03em}.history-section:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.history-list{display:flex;flex-direction:column;gap:.5rem}.history-item{display:flex;align-items:center;gap:1rem;padding:.75rem;background:#f8f9fa;border-radius:6px}.mode-badge{padding:.25rem .5rem;border-radius:4px;font-size:.75rem;font-weight:600;text-transform:uppercase}.mode-badge.beautify{background:#e6fffa;color:#319795}.mode-badge.minify{background:#fef3c7;color:#d97706}.mode-badge.validate{background:#e9d8fd;color:#805ad5}.history-preview{flex:1;font-family:monospace;font-size:.85rem;color:var(--text-light);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-time{font-size:.8rem;color:var(--text-light)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:2rem}.feature-card{background:#fff;border-radius:12px;padding:1.5rem;box-shadow:0 2px 8px #0000001a;text-align:center}.feature-icon{width:50px;height:50px;margin:0 auto 1rem;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem}.feature-card h3{color:var(--text-color);margin-bottom:.5rem}.feature-card p{color:var(--text-light);font-size:.95rem;line-height:1.6;margin:0}.tips-section{background:#fff;border-radius:12px;padding:2rem;margin-bottom:2rem;box-shadow:0 2px 8px #0000001a}.tips-section h3{text-align:center;color:var(--text-color);margin-bottom:1.5rem}.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem}.tip{padding:1rem;background:#f8f9fa;border-radius:8px;border-left:4px solid var(--primary-color)}.tip strong{display:block;color:var(--text-color);margin-bottom:.5rem}.tip p{margin:0;font-size:.875rem;color:var(--text-light);line-height:1.6}.cta-section{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;text-align:center;padding:3rem 2rem;border-radius:12px}.cta-section h2{margin-bottom:1rem;font-size:1.75rem}.cta-section p{margin-bottom:1.5rem;opacity:.95;max-width:600px;margin-left:auto;margin-right:auto}.cta-button{display:inline-block;padding:1rem 2.5rem;background:#fff;color:var(--primary-color);text-decoration:none;border-radius:8px;font-weight:600;transition:transform .3s ease}.cta-button:hover{transform:translateY(-2px)}@media (max-width: 768px){.html-minifier{padding:1rem}.mode-buttons{flex-direction:column}.minify-options{flex-direction:column;gap:1rem}.editor-container{grid-template-columns:1fr}.editor-panel textarea{height:300px}.stats-display{display:grid;grid-template-columns:repeat(2,1fr)}}