*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--blue: #2563eb;--blue-light: #eff6ff;--blue-dark: #1d4ed8;--green: #16a34a;--green-light: #f0fdf4;--red: #dc2626;--red-light: #fef2f2;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-400: #9ca3af;--gray-600: #4b5563;--gray-800: #1f2937;--radius: 10px;--shadow: 0 1px 3px rgba(0,0,0,.12)}html,body,#root{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px;background:var(--gray-50);color:var(--gray-800)}.app{display:flex;flex-direction:column;height:100vh;max-width:480px;margin:0 auto;background:#fff;box-shadow:0 0 24px #00000014}.app-header{background:var(--blue);color:#fff;padding:14px 16px;display:flex;align-items:center;gap:10px}.app-header h1{font-size:18px;font-weight:700;flex:1}.app-content{flex:1;overflow-y:auto;padding:16px}.bottom-nav{display:flex;border-top:1px solid var(--gray-200);background:#fff}.bottom-nav button{flex:1;border:none;background:none;padding:10px 4px 8px;font-size:11px;color:var(--gray-400);cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:3px;transition:color .15s}.bottom-nav button.active{color:var(--blue)}.bottom-nav button svg{width:22px;height:22px}.card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius);padding:14px;margin-bottom:10px;box-shadow:var(--shadow)}.card-title{font-weight:700;font-size:17px}.card-sub{font-size:12px;color:var(--gray-400);margin-top:2px}.card-row{display:flex;justify-content:space-between;align-items:flex-start}.tag{display:inline-block;background:var(--blue-light);color:var(--blue);border-radius:4px;padding:1px 7px;font-size:11px;font-weight:600}.tag-green{background:var(--green-light);color:var(--green)}.tag-red{background:var(--red-light);color:var(--red)}.input{width:100%;border:1px solid var(--gray-200);border-radius:8px;padding:10px 12px;font-size:15px;outline:none}.input:focus{border-color:var(--blue)}.select{width:100%;border:1px solid var(--gray-200);border-radius:8px;padding:10px 12px;font-size:15px;background:#fff}.btn{border:none;border-radius:8px;padding:10px 18px;font-size:15px;cursor:pointer;font-weight:600;transition:opacity .15s}.btn:disabled{opacity:.45;cursor:default}.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover:not(:disabled){background:var(--blue-dark)}.btn-outline{background:#fff;color:var(--blue);border:1.5px solid var(--blue)}.btn-danger{background:var(--red);color:#fff}.btn-sm{padding:6px 12px;font-size:13px}.btn-icon{background:none;border:none;cursor:pointer;padding:6px;border-radius:6px;display:inline-flex}.btn-icon:hover{background:var(--gray-100)}.search-wrap{position:relative;margin-bottom:12px}.search-wrap svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--gray-400);width:16px}.search-wrap .input{padding-left:34px}.row{display:flex;gap:8px;align-items:center}.row-end{justify-content:flex-end}.gap-top{margin-top:12px}.gap-top-sm{margin-top:8px}.text-sm{font-size:13px}.text-gray{color:var(--gray-400)}.text-green{color:var(--green)}.text-red{color:var(--red)}.text-center{text-align:center}.divider{border:none;border-top:1px solid var(--gray-200);margin:12px 0}.spinner{text-align:center;padding:40px;color:var(--gray-400)}.empty{text-align:center;padding:40px;color:var(--gray-400);font-size:14px}.quiz-question{font-size:22px;font-weight:700;margin-bottom:24px;line-height:1.3}.quiz-option{width:100%;text-align:left;border:2px solid var(--gray-200);border-radius:10px;padding:13px 16px;font-size:16px;background:#fff;cursor:pointer;margin-bottom:10px;transition:border-color .15s}.quiz-option:hover:not(:disabled){border-color:var(--blue)}.quiz-option.selected{border-color:var(--blue);background:var(--blue-light)}.quiz-option.correct{border-color:var(--green);background:var(--green-light)}.quiz-option.wrong{border-color:var(--red);background:var(--red-light)}.quiz-result{font-size:18px;font-weight:700;padding:14px;border-radius:10px;text-align:center;margin:16px 0}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13px}th{background:var(--blue);color:#fff;padding:8px 10px;text-align:left;white-space:nowrap}td{padding:7px 10px;border-bottom:1px solid var(--gray-200);vertical-align:top}tr:nth-child(2n) td{background:var(--gray-50)}td:first-child{font-weight:700}.import-section{margin-bottom:20px}.import-section h3{font-size:15px;font-weight:700;margin-bottom:8px}.dropzone{border:2px dashed var(--gray-200);border-radius:10px;padding:24px;text-align:center;color:var(--gray-400);font-size:14px;cursor:pointer}.dropzone:hover{border-color:var(--blue);color:var(--blue)}.log-box{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:8px;padding:10px;font-size:12px;font-family:monospace;max-height:160px;overflow-y:auto;margin-top:8px}