:root {
  --color-bg: #f4f5f7;
  --color-surface: #ffffff;
  --color-border: #e3e5ea;
  --color-text: #1f2430;
  --color-text-sub: #5a6270;

  --color-assistant: #6c5ce7;
  --color-assistant-bg: #f2effc;
  --color-assistant-dark: #5847c9;

  --color-generate: #00a884;
  --color-generate-bg: #e9f9f4;
  --color-generate-dark: #048a6c;

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow: 0 2px 10px rgba(20, 20, 40, 0.06);
  --shadow-hover: 0 8px 22px rgba(20, 20, 40, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  font-size: 16px;
}

.app-header {
  padding: 40px 24px 34px;
  text-align: center;
  background: linear-gradient(120deg, var(--color-assistant), var(--color-generate));
}

.app-header h1 {
  margin: 0;
  color: #fff;
  font-size: 1.9rem;
  letter-spacing: 0.02em;
  font-weight: 700;
}

.app-header .app-tagline {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
  font-weight: 500;
}

.main-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 64px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
    padding: 28px 16px 48px;
    gap: 20px;
  }
}

.panel {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 30px 28px 34px;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  border-top: 4px solid transparent;
}

.panel-assistant {
  border-top-color: var(--color-assistant);
}

.panel-generate {
  border-top-color: var(--color-generate);
}

.panel-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}

.panel-assistant .panel-badge {
  background: var(--color-assistant-bg);
  color: var(--color-assistant-dark);
}

.panel-generate .panel-badge {
  background: var(--color-generate-bg);
  color: var(--color-generate-dark);
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}

.panel-desc {
  margin: 0 0 26px;
  color: var(--color-text-sub);
  font-size: 0.94rem;
  line-height: 1.7;
}

.field-group {
  margin-bottom: 20px;
  flex: 1;
}

.field-row {
  display: flex;
  gap: 16px;
}

@media (max-width: 520px) {
  .field-row {
    flex-direction: column;
    gap: 0;
  }
}

.field-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.select-input,
.text-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fafafa;
  font-size: 0.95rem;
  line-height: 1.6;
  font-family: inherit;
  color: var(--color-text);
  resize: vertical;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.select-input:focus,
.text-input:focus {
  outline: none;
  border-color: var(--color-assistant);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.12);
  background: #fff;
}

.panel-generate .text-input:focus,
.panel-generate .select-input:focus {
  border-color: var(--color-generate);
  box-shadow: 0 0 0 3px rgba(0, 168, 132, 0.12);
}

.upload-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 2px dashed #ddd8f5;
  border-radius: var(--radius-md);
  padding: 30px 16px;
  background: #faf9ff;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}

.upload-box:hover {
  border-color: var(--color-assistant);
  background: var(--color-assistant-bg);
}

.upload-icon {
  font-size: 1.9rem;
}

.upload-text {
  font-size: 0.9rem;
  font-weight: 600;
}

.upload-sub {
  font-size: 0.78rem;
  color: var(--color-text-sub);
}

.upload-filename {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--color-assistant-dark);
  font-weight: 600;
  min-height: 1.2em;
}

.btn {
  display: block;
  width: 100%;
  padding: 14px 18px;
  min-height: 48px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  color: #fff;
  transition: transform 0.1s, box-shadow 0.15s, opacity 0.15s;
  margin-top: 8px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.btn:active {
  transform: translateY(0);
  opacity: 0.9;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
  box-shadow: none;
}

.btn-assistant {
  background: linear-gradient(90deg, var(--color-assistant), var(--color-assistant-dark));
}

.btn-generate {
  background: linear-gradient(90deg, var(--color-generate), var(--color-generate-dark));
}

.result-box {
  margin-top: 24px;
  padding: 20px;
  background: var(--color-assistant-bg);
  border-radius: var(--radius-md);
  border: 1px solid #e0d9f7;
  display: none;
}

.result-box.show {
  display: block;
}

.result-box.error {
  background: #fdecec;
  border-color: #f5c2c2;
}

.result-box.error .result-label,
.result-box.error .result-text {
  color: #b3261e;
}

.result-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-text-sub);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.result-text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  white-space: pre-line;
}

.preview-area {
  margin-top: 26px;
}

.preview-grid {
  display: none;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 10px;
}

.preview-grid.show {
  display: grid;
}

/* タブレット幅：画面いっぱいに間延びさせず2列に固定 */
@media (min-width: 641px) and (max-width: 900px) {
  .preview-grid.show {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* PC幅：枚数に応じて自動調整（1枚なら全幅、複数枚なら並べる） */
@media (min-width: 901px) {
  .preview-grid.show {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}

.preview-card {
  background: var(--color-generate-bg);
  border: 1px solid #cdeee3;
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  transition: background 0.15s, border-color 0.15s;
}

/* 画像が生成済みのカードは、写真が主役になるよう背景をニュートラルにする */
.preview-card.has-image {
  background: var(--color-surface);
  border-color: var(--color-border);
}

.preview-card-thumb {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: #f0f9f6;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 12px;
  color: var(--color-generate-dark);
}

.preview-card-title {
  font-weight: 700;
  font-size: 0.94rem;
  margin-bottom: 4px;
}

.preview-card-sub {
  font-size: 0.82rem;
  color: var(--color-text-sub);
  margin-bottom: 2px;
}

.preview-card-note {
  font-size: 0.8rem;
  color: var(--color-generate-dark);
  font-weight: 600;
  margin-top: 6px;
}

.preview-card.is-error .preview-card-thumb {
  color: #b3261e;
  background: #fdecec;
}

.preview-card.is-error .preview-card-note {
  color: #b3261e;
}

.preview-card-image-wrap {
  position: relative;
  margin-bottom: 12px;
}

.preview-card-image {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-sm);
  display: block;
  cursor: zoom-in;
  transition: opacity 0.15s;
}

.preview-card-image:hover {
  opacity: 0.9;
}

.preview-card-download {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.preview-card-download:hover {
  background: rgba(0, 0, 0, 0.75);
}

.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -0.15em;
  margin-right: 6px;
}

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

.app-footer {
  text-align: center;
  padding: 28px 18px;
  color: var(--color-text-sub);
  font-size: 0.82rem;
}

.image-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 16, 24, 0.85);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  padding: 24px;
}

.image-modal.show {
  display: flex;
}

.image-modal-img {
  max-width: min(90vw, 720px);
  max-height: 70vh;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  object-fit: contain;
}

.image-modal-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
}

.image-modal-close:hover {
  background: rgba(255, 255, 255, 0.28);
}

.image-modal-download {
  width: auto;
  min-width: 200px;
  padding: 12px 28px;
}