* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  width: 400px;
  min-height: 480px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 14px;
  color: #333;
  background: #f8fafc;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 480px;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.badge {
  font-size: 11px;
  background: rgba(255,255,255,0.2);
  padding: 2px 8px;
  border-radius: 10px;
}

/* Screens */
.screen {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  background: #e8edf5;
  border-radius: 8px;
  padding: 4px;
}

.tab {
  flex: 1;
  padding: 8px 4px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  color: #64748b;
  transition: all 0.2s;
  font-weight: 500;
}

.tab:hover {
  color: #2563eb;
  background: rgba(37, 99, 235, 0.08);
}

.tab.active {
  background: #fff;
  color: #2563eb;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Form Elements */
input, textarea, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
  background: #fff;
}

input:focus, textarea:focus, select:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

textarea {
  resize: vertical;
  min-height: 60px;
  margin-bottom: 8px;
}

input {
  margin-bottom: 8px;
}

select {
  margin-bottom: 0;
  cursor: pointer;
}

.row {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.row select {
  flex: 1;
}

.row input {
  flex: 1;
  margin-bottom: 0;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-link {
  background: none;
  border: none;
  color: #64748b;
  font-size: 13px;
  cursor: pointer;
  padding: 4px 8px;
}

.btn-link:hover {
  color: #2563eb;
}

/* Result Box */
.result-box {
  margin-top: 8px;
  padding: 12px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  min-height: 40px;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.result-box:empty {
  display: none;
}

.result-box .loading {
  color: #64748b;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-box .error {
  color: #dc2626;
}

.result-box .item {
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
}

.result-box .item:last-child {
  border-bottom: none;
}

.result-box .item-label {
  font-weight: 600;
  color: #2563eb;
  margin-bottom: 4px;
}

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid #e0e0e0;
  border-top-color: #2563eb;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Settings */
.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: #64748b;
  margin-bottom: 4px;
}

.status {
  margin-top: 8px;
  font-size: 13px;
}

.status.success { color: #16a34a; }
.status.error { color: #dc2626; }

.hint {
  font-size: 12px;
  color: #94a3b8;
  margin-top: 12px;
  line-height: 1.5;
}

/* Footer */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  border-top: 1px solid #e5e7eb;
  background: #fff;
}

.credits {
  font-size: 12px;
  color: #94a3b8;
}

/* Inline Copy Button */
.copy-btn {
  float: right;
  padding: 2px 8px;
  font-size: 11px;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  color: #64748b;
}

.copy-btn:hover {
  background: #f0f4ff;
  color: #2563eb;
}

/* ─── Upgrade Banner ─────────────────────────────── */
.upgrade-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-top: 1px solid #f59e0b;
  font-size: 13px;
  animation: slideUp 0.3s ease;
}

.upgrade-banner-text {
  flex: 1;
  color: #92400e;
  font-weight: 500;
}

.upgrade-btn {
  padding: 6px 16px;
  border: none;
  border-radius: 6px;
  background: #f59e0b;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.upgrade-btn:hover {
  background: #d97706;
}

.upgrade-close {
  background: none;
  border: none;
  font-size: 18px;
  color: #92400e;
  cursor: pointer;
  padding: 0 4px;
  opacity: 0.6;
}

.upgrade-close:hover {
  opacity: 1;
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ─── Credit Error ───────────────────────────────── */
.credit-error {
  padding: 12px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  text-align: center;
  font-weight: 500;
}

.credit-error-hint {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  font-weight: 400;
  color: #92400e;
}

/* ─── Modal ───────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: #fff;
  border-radius: 16px;
  width: 360px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 16px 48px rgba(0,0,0,0.2);
  animation: scaleIn 0.25s ease;
}

.modal-sm {
  width: 300px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px 0;
}

.modal-header h3 {
  font-size: 16px;
  color: #1e293b;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 22px;
  color: #94a3b8;
  cursor: pointer;
  padding: 0 4px;
}

.modal-close-btn:hover {
  color: #64748b;
}

.modal-body {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-footer {
  padding: 8px 20px 16px;
  text-align: center;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ─── Plan Cards ──────────────────────────────────── */
.plan-card {
  padding: 14px 16px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  text-align: center;
  position: relative;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.plan-card:hover {
  border-color: #2563eb;
  box-shadow: 0 2px 8px rgba(37,99,235,0.1);
}

.plan-card.featured {
  border-color: #2563eb;
  background: #f8faff;
}

.plan-badge {
  position: absolute;
  top: -10px;
  right: 16px;
  background: #2563eb;
  color: #fff;
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 600;
}

.plan-name {
  font-size: 14px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 4px;
}

.plan-price {
  font-size: 24px;
  font-weight: 800;
  color: #2563eb;
  margin-bottom: 8px;
}

.plan-price small {
  font-size: 13px;
  font-weight: 400;
  color: #64748b;
}

.plan-features {
  list-style: none;
  font-size: 12px;
  color: #64748b;
  line-height: 1.8;
  margin-bottom: 10px;
}

.plan-btn {
  width: 100%;
}