.tool-main-container { max-width: 800px; margin: 0 auto; padding: 2rem 1rem; }
.tool-header { text-align: center; margin-bottom: 2rem; color: var(--text-color); }
.tool-header h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.card { background: var(--card-bg, #ffffff); color: var(--text-color, #1e293b); padding: 2rem; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border: 1px solid var(--border-color, #e2e8f0); text-align: center; }
.upload-area { border: 2px dashed #3b82f6; border-radius: 10px; padding: 3rem 1rem; background: rgba(59, 130, 246, 0.05); transition: 0.3s; cursor: pointer; }
.upload-area.dragover { background: rgba(59, 130, 246, 0.15); border-color: #2563eb; }
.upload-icon { font-size: 4rem; margin-bottom: 1rem; }
.upload-area h3 { margin-bottom: 0.5rem; }
.upload-area p { margin-bottom: 1rem; color: var(--text-color); opacity: 0.7; }
.hidden { display: none !important; }
.status-area { margin-top: 2rem; padding-top: 2rem; border-top: 1px solid var(--border-color); }
.file-info { background: var(--bg-color, #f8fafc); padding: 1rem; border-radius: 8px; font-weight: bold; margin-bottom: 1rem; border: 1px solid var(--border-color); }
.progress-bar-container { width: 100%; height: 8px; background: #e2e8f0; border-radius: 4px; overflow: hidden; margin-bottom: 1rem; }
.progress-bar { width: 0%; height: 100%; background: #10b981; transition: width 0.3s ease; }
.mt-3 { margin-top: 1rem; }
.w-100 { width: 100%; padding: 1rem; font-size: 1.1rem; }
.nidar-primary-btn { background: #3b82f6; color: #fff; border: none; padding: 0.8rem 1.5rem; border-radius: 6px; cursor: pointer; font-size: 1rem; font-weight: bold; transition: 0.3s; }
.nidar-primary-btn:hover { background: #2563eb; }
.nidar-primary-btn:disabled { background: #94a3b8; cursor: not-allowed; }
.nidar-primary-btn.success { background: #10b981; }