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

:root {
  --gold: #B8860B;
  --gold-light: #D4A843;
  --gold-bg: #FAF6EE;
  --dark: #2C2C2C;
  --text: #444;
  --text-light: #888;
  --white: #fff;
  --border: #E8E0D0;
  --bg: #FDFBF7;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.05);
  --radius: 12px;
}

body {
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.header {
  text-align: center;
  padding: 40px 20px 24px;
}

.brand-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--gold);
  border: 1.5px solid var(--gold);
  padding: 4px 16px;
  border-radius: 16px;
  margin-bottom: 16px;
}

h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.subtitle {
  font-size: 14px;
  color: var(--text-light);
}

/* ===== Sections ===== */
.section {
  margin-bottom: 24px;
}

.label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
}

.label-hint {
  font-weight: 400;
  color: var(--text-light);
  font-size: 13px;
}

/* ===== Textarea ===== */
.input-prompt {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 15px;
  color: var(--dark);
  background: var(--white);
  resize: vertical;
  transition: border-color 0.2s;
  line-height: 1.5;
}

.input-prompt:focus {
  outline: none;
  border-color: var(--gold);
}

.input-prompt::placeholder {
  color: #bbb;
}

/* ===== Upload Area ===== */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
  transition: all 0.2s;
  overflow: hidden;
  position: relative;
}

.upload-area:hover {
  border-color: var(--gold-light);
  background: var(--gold-bg);
}

.upload-area.has-image {
  border-style: solid;
  border-color: var(--gold);
}

.upload-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  gap: 8px;
  color: var(--text-light);
  font-size: 14px;
}

.upload-icon {
  font-size: 32px;
}

.upload-preview {
  position: relative;
}

.upload-preview img {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  display: block;
}

.remove-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.6);
  color: var(--white);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Purpose Options ===== */
.option-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.option-card {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.option-card:hover {
  border-color: var(--gold-light);
  background: var(--gold-bg);
}

.option-card.selected {
  border-color: var(--gold);
  background: var(--gold-bg);
  box-shadow: 0 0 0 1px var(--gold);
}

.option-ratio {
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 4px;
}

.option-name {
  font-size: 13px;
  color: var(--text);
}

/* ===== Toggle Group ===== */
.toggle-group {
  display: flex;
  gap: 0;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.toggle-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: var(--white);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn:not(:last-child) {
  border-right: 1.5px solid var(--border);
}

.toggle-btn.active {
  background: var(--gold);
  color: var(--white);
}

.toggle-btn:hover:not(.active) {
  background: var(--gold-bg);
}

/* ===== Generate Button ===== */
.action-area {
  text-align: center;
  padding: 8px 0 32px;
}

.btn-generate {
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--white);
  border: none;
  padding: 14px 56px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 28px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
}

.btn-generate:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(184, 134, 11, 0.3);
}

.btn-generate:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* ===== Result Area ===== */
.result-area {
  padding-bottom: 60px;
}

.loading {
  text-align: center;
  padding: 48px 0;
}

.loading p {
  font-size: 14px;
  color: var(--text-light);
  margin-top: 16px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

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

/* Result Image */
.result-image-wrapper {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  margin-bottom: 16px;
}

.result-image-wrapper img {
  width: 100%;
  display: block;
}

/* Result Text */
.result-text {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  box-shadow: var(--card-shadow);
  margin-bottom: 16px;
  white-space: pre-wrap;
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-download {
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--white);
  border: none;
  padding: 12px 36px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 24px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}

.btn-download:hover {
  box-shadow: 0 4px 12px rgba(184, 134, 11, 0.3);
}

.btn-retry {
  background: transparent;
  color: var(--text-light);
  border: 1.5px solid var(--border);
  padding: 12px 36px;
  font-size: 15px;
  border-radius: 24px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}

.btn-retry:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* Error */
.error-msg {
  background: #FFF5F5;
  border: 1px solid #E8BCBC;
  border-radius: var(--radius);
  padding: 16px 20px;
  color: #C53030;
  font-size: 14px;
}

/* ===== Product Selector ===== */
.product-scroll {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.product-scroll::-webkit-scrollbar {
  height: 4px;
}

.product-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.product-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.product-thumb-card {
  flex-shrink: 0;
  width: 90px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--white);
}

.product-thumb-card:hover {
  border-color: var(--gold-light);
  box-shadow: 0 2px 10px rgba(184,134,11,0.15);
}

.product-thumb-card.selected {
  border-color: var(--gold);
  box-shadow: 0 0 0 2px var(--gold);
}

.product-thumb-card img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  display: block;
}

.product-thumb-name {
  font-size: 11px;
  color: var(--text);
  text-align: center;
  padding: 6px 4px;
  line-height: 1.3;
}

.product-thumb-card.selected .product-thumb-name {
  color: var(--gold);
  font-weight: 600;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  h1 {
    font-size: 24px;
  }

  .option-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .result-actions {
    flex-direction: column;
  }

  .btn-download, .btn-retry {
    width: 100%;
  }
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-light);
}

.ig-link {
  display: inline-flex;
  align-items: center;
  vertical-align: -3px;
  margin-left: 8px;
  color: var(--text-light);
  transition: color 0.2s;
}

.ig-link:hover {
  color: var(--gold);
}