/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: #f0f2f5;
  color: #333;
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== Layout ===== */
.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

header {
  text-align: center;
  margin-bottom: 24px;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a3a5c;
}

header p {
  font-size: 0.875rem;
  color: #666;
  margin-top: 4px;
}

/* ===== Card ===== */
.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  padding: 24px;
  margin-bottom: 20px;
}

.card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #1a3a5c;
  margin-bottom: 16px;
}

/* ===== Form ===== */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: #555;
  margin-bottom: 6px;
}

.form-group label .optional {
  color: #999;
  font-weight: 400;
}

.form-group select,
.form-group input[type="text"],
.form-group input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px; /* 防止 iOS 自動縮放 */
  border: 1px solid #d0d5dd;
  border-radius: 8px;
  background: #fff;
  color: #333;
  transition: border-color 0.2s;
  -webkit-appearance: none;
  appearance: none;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-group select:focus,
.form-group input:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s, opacity 0.2s;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  width: 100%;
  background: #1a3a5c;
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: #254d77;
}

.btn-download {
  width: 100%;
  background: #16a34a;
  color: #fff;
  margin-top: 12px;
}

.btn-download:hover:not(:disabled) {
  background: #15803d;
}

.btn-secondary {
  width: 100%;
  background: #e5e7eb;
  color: #333;
}

.btn-secondary:hover:not(:disabled) {
  background: #d1d5db;
}

/* ===== Result Area ===== */
.result-area {
  text-align: center;
  margin-top: 20px;
}

.result-area canvas {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.result-area .qr-info {
  font-size: 0.875rem;
  color: #555;
  margin-top: 8px;
  word-break: break-all;
}

/* ===== Error Message ===== */
.error-msg {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.875rem;
  margin-bottom: 16px;
  display: none;
}

.error-msg.show {
  display: block;
}

/* ===== Collapsible Section ===== */
.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.collapsible-header .arrow {
  transition: transform 0.2s;
  font-size: 0.75rem;
  color: #999;
}

.collapsible-header.open .arrow {
  transform: rotate(90deg);
}

.collapsible-body {
  display: none;
  margin-top: 16px;
}

.collapsible-body.open {
  display: block;
}

/* ===== File Input ===== */
.file-drop {
  border: 2px dashed #d0d5dd;
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  color: #888;
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.file-drop:hover {
  border-color: #2563eb;
  background: #f8fafc;
}

.file-drop input[type="file"] {
  display: none;
}

.file-drop .file-name {
  margin-top: 8px;
  color: #333;
  font-weight: 500;
}

/* ===== Batch Progress ===== */
.batch-progress {
  margin-top: 12px;
  font-size: 0.875rem;
  color: #555;
}

/* ===== Disclaimer ===== */
.disclaimer {
  font-size: 0.8125rem;
  color: #888;
  line-height: 1.7;
}

.disclaimer h2 {
  font-size: 0.9375rem;
  color: #666;
}

.disclaimer ul {
  padding-left: 20px;
}

.disclaimer li {
  margin-bottom: 4px;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  font-size: 0.75rem;
  color: #aaa;
  padding: 16px 0;
}

footer a {
  color: #2563eb;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ===== Saved Accounts ===== */
.saved-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.saved-row select {
  flex: 1;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid #d0d5dd;
  border-radius: 8px;
  background: #fff;
  color: #333;
  transition: border-color 0.2s;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.saved-row select:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.btn-save {
  width: 100%;
  background: #2563eb;
  color: #fff;
  margin-top: 8px;
}

.btn-save:hover:not(:disabled) {
  background: #1d4ed8;
}

.btn-delete {
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  background: #ef4444;
  color: #fff;
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-delete:hover:not(:disabled) {
  background: #dc2626;
}

/* ===== Mode Tabs ===== */
.mode-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 16px;
  background: #e5e7eb;
  border-radius: 8px;
  padding: 3px;
}

.mode-tab {
  flex: 1;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: #666;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.mode-tab:hover {
  color: #333;
}

.mode-tab.active {
  background: #1a3a5c;
  color: #fff;
}

/* ===== Fee Hint ===== */
.fee-hint {
  margin-top: 6px;
  font-size: 0.8125rem;
  color: #666;
  line-height: 1.5;
  background: #f8f9fa;
  border-left: 3px solid #2563eb;
  padding: 8px 12px;
  border-radius: 0 6px 6px 0;
}

/* ===== Fee Service Fee ===== */
.fee-service-fee {
  margin-top: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.5;
}

.fee-service-fee.free {
  color: #16a34a;
}

.fee-service-fee.charged {
  color: #dc2626;
}

/* ===== Hidden Utility ===== */
.hidden {
  display: none !important;
}

/* ===== Responsive ===== */
@media (min-width: 600px) {
  .container {
    padding: 40px 24px 64px;
  }

  header h1 {
    font-size: 1.75rem;
  }

  .card {
    padding: 32px;
  }
}