*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{
  --red:#F44336;
  --red-dark:#D32F2F;
  --red-light:#FFCDD2;
  --bg:#F5F5F5;
  --surface:#FFFFFF;
  --text:#212121;
  --text-secondary:#757575;
  --border:#E0E0E0;
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 2px 8px rgba(0,0,0,.08);
  --nav-height:64px;
  --header-height:56px;
}
html,body{height:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:15px}
#splash{position:fixed;inset:0;background:linear-gradient(135deg,var(--red),var(--red-dark));z-index:9999;display:flex;flex-direction:column;align-items:center;justify-content:center;transition:opacity .5s ease}
#splash.hide{opacity:0;pointer-events:none}
.splash-icon{width:80px;height:80px;background:#fff;border-radius:20px;display:flex;align-items:center;justify-content:center;font-size:36px;font-weight:800;color:var(--red);box-shadow:0 8px 24px rgba(0,0,0,.2)}
.splash-text{color:#fff;font-size:20px;font-weight:600;margin-top:16px;letter-spacing:.5px}
#app{height:100%;display:flex;flex-direction:column;opacity:1}

/* Header */
#header{height:var(--header-height);background:var(--surface);display:flex;align-items:center;padding:0 12px;border-bottom:1px solid var(--border);z-index:100;flex-shrink:0}
#headerTitle{flex:1;text-align:center;font-size:17px;font-weight:600;color:var(--text)}
.icon-btn{width:40px;height:40px;border:none;background:none;font-size:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text)}
.icon-btn:active{background:var(--red-light)}

/* Content */
#content{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch}
.page{display:none;padding:16px;min-height:100%}
.page.active{display:block}

/* Bottom Nav */
#bottomNav{height:var(--nav-height);background:var(--surface);border-top:1px solid var(--border);display:flex;flex-shrink:0;padding-bottom:env(safe-area-inset-bottom)}
.nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;border:none;background:none;cursor:pointer;gap:2px;padding:8px 0;color:var(--text-secondary);transition:color .2s}
.nav-item.active{color:var(--red)}
.nav-item:active{opacity:.7}
.nav-icon{font-size:22px;line-height:1}
.nav-label{font-size:11px;font-weight:500}

/* Empty State */
.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center}
.empty-icon{font-size:48px;margin-bottom:12px}
.empty-state p{font-size:16px;font-weight:500;color:var(--text)}
.empty-sub{font-size:13px;color:var(--text-secondary)!important;font-weight:400!important;margin-top:4px}

/* Document Grid */
.doc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;padding:4px 0}
.doc-card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;cursor:pointer;transition:transform .15s}
.doc-card:active{transform:scale(.97)}
.doc-card-preview{height:120px;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:40px;color:var(--text-secondary);position:relative;overflow:hidden}
.doc-card-preview img{width:100%;height:100%;object-fit:cover}
.doc-card-preview .doc-type-badge{position:absolute;top:8px;right:8px;background:var(--red);color:#fff;font-size:10px;padding:2px 6px;border-radius:4px;font-weight:600}
.doc-card-info{padding:10px 12px}
.doc-card-title{font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.doc-card-date{font-size:11px;color:var(--text-secondary);margin-top:2px}
.doc-card-delete{position:absolute;top:6px;left:6px;width:28px;height:28px;background:rgba(0,0,0,.5);border:none;border-radius:50%;color:#fff;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center}

/* Steps */
.step-indicator{display:flex;gap:0;margin-bottom:16px;background:var(--surface);border-radius:var(--radius);padding:8px;box-shadow:var(--shadow)}
.step{flex:1;text-align:center;font-size:11px;color:var(--text-secondary);padding:8px 4px;border-radius:var(--radius-sm);transition:all .3s;font-weight:500}
.step span{display:inline-flex;width:20px;height:20px;border-radius:50%;background:var(--red-light);color:var(--red-dark);align-items:center;justify-content:center;font-size:11px;font-weight:700;margin-right:4px;vertical-align:middle}
.step.active{background:var(--red);color:#fff}
.step.active span{background:#fff;color:var(--red)}
.step.done{color:var(--red)}

/* Upload */
.upload-area{background:var(--surface);border:2px dashed var(--border);border-radius:var(--radius);padding:40px 24px;text-align:center;cursor:pointer;transition:border-color .3s;margin-bottom:16px}
.upload-area.dragover{border-color:var(--red);background:var(--red-light)}
.upload-icon{font-size:48px;margin-bottom:8px}
.upload-area h2{font-size:18px;font-weight:600;margin-bottom:4px}
.upload-area p{font-size:13px;color:var(--text-secondary);margin-bottom:16px}
.upload-area input[type=file]{display:none}
.upload-btn{display:inline-block;padding:10px 32px;background:var(--red);color:#fff;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer}
.upload-btn:active{background:var(--red-dark)}
.upload-preview{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:8px}
.upload-preview-item{position:relative;border-radius:var(--radius-sm);overflow:hidden;background:var(--surface);box-shadow:var(--shadow)}
.upload-preview-item img,.upload-preview-item canvas{width:100%;height:80px;object-fit:cover;display:block}
.upload-preview-item .up-name{font-size:11px;padding:4px 6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.upload-preview-item .up-remove{position:absolute;top:4px;right:4px;width:22px;height:22px;background:rgba(0,0,0,.5);border:none;border-radius:50%;color:#fff;font-size:12px;cursor:pointer}

/* Settings */
.settings-list{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin-bottom:16px}
.settings-item{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-bottom:1px solid var(--border)}
.settings-item:last-child{border-bottom:none}
.settings-label{font-size:15px;color:var(--text)}
.settings-value{font-size:14px;color:var(--text-secondary)}
.settings-section{padding:0 4px}
.settings-section h3{font-size:14px;font-weight:600;color:var(--text-secondary);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}
.btn{display:block;width:100%;padding:14px 20px;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer;margin-bottom:10px;text-align:center}
.btn-danger{background:var(--red);color:#fff}
.btn-outline{background:var(--surface);color:var(--red);border:1.5px solid var(--red)}
.btn:active{opacity:.8}

/* Modal */
.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;padding:16px;align-items:center;justify-content:center}
.modal.show{display:flex}
.modal-content{background:var(--surface);border-radius:var(--radius);max-width:500px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 8px 32px rgba(0,0,0,.2)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border)}
.modal-header h2{font-size:17px;font-weight:600}
.modal-close{width:32px;height:32px;border:none;background:none;font-size:20px;cursor:pointer;border-radius:50%}
.modal-body{padding:16px}
.modal-footer{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--border)}
.modal-footer .btn{flex:1;margin:0}

/* Document Viewer */
.doc-viewer{position:relative;width:100%;min-height:400px;background:var(--bg);border-radius:var(--radius-sm);overflow:hidden}
.doc-viewer img,.doc-viewer canvas{width:100%;display:block}
.doc-viewer .field-overlay{position:absolute;cursor:move;background:rgba(255,235,59,.25);border:2px solid #FFD600;border-radius:4px;min-width:40px;min-height:24px;transition:background .2s}
.doc-viewer .field-overlay:hover,.doc-viewer .field-overlay:focus-within{background:rgba(255,235,59,.45)}
.doc-viewer .field-overlay textarea,.doc-viewer .field-overlay input{width:100%;height:100%;border:none;background:transparent;padding:4px 6px;font-size:13px;resize:none;outline:none;font-family:inherit;color:var(--text)}
.doc-viewer .field-overlay .field-label{position:absolute;top:-18px;left:0;font-size:10px;color:var(--text-secondary);white-space:nowrap;background:var(--surface);padding:0 4px;border-radius:2px}
.doc-viewer .field-overlay .field-del{position:absolute;top:-10px;right:-10px;width:18px;height:18px;border:none;background:var(--red);color:#fff;border-radius:50%;font-size:10px;cursor:pointer;display:none;align-items:center;justify-content:center}
.doc-viewer .field-overlay:hover .field-del{display:flex}

/* Right panel for field creation */
.field-tools{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px;margin-bottom:12px}
.field-tools h3{font-size:14px;font-weight:600;margin-bottom:8px}
.field-tools-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.field-tool-btn{padding:10px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);cursor:pointer;text-align:center;font-size:13px;font-weight:500;transition:all .15s}
.field-tool-btn:active{border-color:var(--red);background:var(--red-light)}
.field-tool-btn .ft-icon{font-size:18px;display:block;margin-bottom:2px}

/* Toast */
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);background:var(--text);color:#fff;padding:10px 20px;border-radius:8px;font-size:14px;z-index:2000;opacity:0;transition:opacity .3s;pointer-events:none;white-space:nowrap}
.toast.show{opacity:1}

/* Form builder in modal */
.form-field{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}
.form-field label{font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.3px}
.form-field input,.form-field select,.form-field textarea{padding:8px 10px;border:1.5px solid var(--border);border-radius:6px;font-size:14px;font-family:inherit;outline:none;transition:border-color .2s}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--red)}
.form-field textarea{min-height:60px;resize:vertical}

/* Responsive */
@media(min-width:768px){
  .doc-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}
  #content{padding:24px;max-width:800px;margin:0 auto}
}