:root {
  --ios-bg: #F2F2F7;
  --ios-card-bg: #FFFFFF;
  --ios-primary: #007AFF;
  --ios-text: #000000;
  --ios-secondary-text: #8E8E93;
  --ios-border: #C6C6C8;
  --ios-separator: rgba(60, 60, 67, 0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--ios-bg);
  color: var(--ios-text);
  overflow: hidden;
  position: fixed;
  width: 100%;
  height: 100%;
}

.ios-navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: calc(44px + env(safe-area-inset-top));
  padding-top: env(safe-area-inset-top);
  background-color: rgba(249, 249, 249, 0.78);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 0.5px solid var(--ios-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding-left: 16px;
  padding-right: 16px;
  z-index: 100;
}

.nav-title {
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.4px;
}

.nav-btn-action {
  position: absolute;
  right: 16px;
  bottom: 10px;
  background: none;
  border: none;
  color: var(--ios-primary);
  font-size: 17px;
  font-weight: 400;
  cursor: pointer;
}

.ios-content {
  position: absolute;
  top: calc(44px + env(safe-area-inset-top));
  bottom: 0;
  left: 0;
  right: 0;
  overflow-y: auto;
  padding: 16px;
  padding-bottom: calc(100px + env(safe-area-inset-bottom));
}

.ios-group-title {
  font-size: 13px;
  text-transform: uppercase;
  color: var(--ios-secondary-text);
  margin-left: 16px;
  margin-bottom: 6px;
  letter-spacing: -0.08px;
}

.ios-list-group {
  background-color: var(--ios-card-bg);
  border-radius: 10px;
  margin-bottom: 22px;
  overflow: hidden;
}

.ios-input-row {
  display: flex;
  align-items: center;
  padding: 11px 16px;
  border-bottom: 0.5px solid var(--ios-separator);
}

.ios-input-row:last-child {
  border-bottom: none;
}

.ios-input-row label {
  width: 100px;
  font-size: 17px;
  letter-spacing: -0.4px;
}

.ios-input-row input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 17px;
  color: var(--ios-text);
  background: transparent;
}

.ios-card {
  background-color: var(--ios-card-bg);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 22px;
}

#signaturePad {
  width: 100%;
  height: 180px;
  background-color: #FAFAFA;
  border: 1px dashed var(--ios-border);
  border-radius: 8px;
  touch-action: none;
}

.canvas-hint {
  text-align: center;
  font-size: 13px;
  color: var(--ios-secondary-text);
  margin-top: 8px;
}

.ios-action-wrapper {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(to top, var(--ios-bg) 80%, rgba(242, 242, 247, 0));
  padding-bottom: calc(16px + env(safe-area-inset-bottom));
  z-index: 90;
}

.ios-btn-primary {
  width: 100%;
  background-color: var(--ios-primary);
  color: #FFFFFF;
  border: none;
  padding: 14px;
  border-radius: 12px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.ios-btn-primary:active {
  opacity: 0.7;
}

.ios-btn-primary:disabled {
  background-color: var(--ios-secondary-text);
  opacity: 0.5;
}

.ios-toast {
  position: fixed;
  top: calc(60px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background-color: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 200;
}

.ios-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}