:root {
  --color-bg: #f4f5f9;
  --color-text: #24262b;
  --color-muted: #6b7080;
  --color-border: #e2e4ec;
  --color-card-bg: #ffffff;

  --color-assistant: #2e9e5b;
  --color-assistant-bg: #eaf7ef;
  --color-assistant-dark: #1f7a44;

  --color-generator: #d4a017;
  --color-generator-bg: #fdf6e0;
  --color-generator-dark: #9a7300;

  --radius-lg: 16px;
  --radius-md: 10px;
  --shadow-card: 0 2px 10px rgba(20, 20, 40, 0.06);
  --shadow-card-hover: 0 6px 20px rgba(20, 20, 40, 0.10);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "游ゴシック体", "YuGothic", "游ゴシック", "Segoe UI", "Meiryo", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.app-header h1 {
  margin: 0;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: linear-gradient(90deg, var(--color-assistant), var(--color-generator));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.app-subtitle {
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ---------- Main layout ---------- */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
    padding: 0 16px 40px;
  }
}

/* ---------- Panel ---------- */
.panel {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 2px solid transparent;
}

.panel-assistant {
  background: var(--color-assistant-bg);
  border-color: rgba(46, 158, 91, 0.15);
}

.panel-generator {
  background: var(--color-generator-bg);
  border-color: rgba(212, 160, 23, 0.15);
}

.panel-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
  color: #fff;
}

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

.panel-generator .panel-badge {
  background: var(--color-generator);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.panel-desc {
  margin: 0 0 20px;
  color: var(--color-muted);
  font-size: 0.92rem;
}

/* ---------- Card ---------- */
.card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
}

/* ---------- Form ---------- */
.form-group {
  margin-bottom: 22px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

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

select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-assistant);
  box-shadow: 0 0 0 3px rgba(46, 158, 91, 0.15);
}

.panel-generator select:focus,
.panel-generator textarea:focus {
  border-color: var(--color-generator);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.15);
}

/* ---------- Upload box ---------- */
.upload-box {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.upload-box:hover {
  border-color: var(--color-assistant);
  background: rgba(46, 158, 91, 0.04);
}

.upload-icon {
  font-size: 1.8rem;
  display: block;
  margin-bottom: 6px;
}

.upload-box p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.upload-filename {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-assistant-dark);
}

/* ---------- Buttons ---------- */
.btn {
  display: block;
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}

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

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-assistant {
  background: var(--color-assistant);
  box-shadow: 0 4px 14px rgba(46, 158, 91, 0.35);
}

.btn-assistant:hover {
  background: var(--color-assistant-dark);
}

.btn-generator {
  background: var(--color-generator);
  color: #3a2c00;
  box-shadow: 0 4px 14px rgba(212, 160, 23, 0.4);
}

.btn-generator:hover {
  background: var(--color-generator-dark);
  color: #fff;
}

/* ---------- Result box (assistant) ---------- */
.result-box {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--color-assistant-bg);
  border-radius: var(--radius-md);
  border: 1px solid rgba(46, 158, 91, 0.2);
}

.result-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-assistant-dark);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.panel-generator .result-label {
  color: var(--color-generator-dark);
}

.result-text {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text);
  white-space: pre-wrap;
}

.result-box-error {
  background: #fdecec;
  border-color: rgba(214, 56, 56, 0.3);
}

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

/* ---------- Preview area (generator) ---------- */
.preview-area {
  margin-top: 20px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

@media (max-width: 900px) {
  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .preview-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
}

.preview-card {
  background: var(--color-generator-bg);
  border: 1px solid rgba(212, 160, 23, 0.2);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

.preview-card .preview-thumb {
  aspect-ratio: 3 / 4;
  background: #fff;
  border: 1px dashed rgba(212, 160, 23, 0.35);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-bottom: 10px;
  color: var(--color-muted);
  font-size: 0.78rem;
  padding: 8px;
}

.preview-thumb .thumb-icon {
  font-size: 1.6rem;
}

.preview-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 6px;
}

.preview-card-error {
  background: #fdecec;
  border-color: rgba(214, 56, 56, 0.3);
}

.preview-card-error .preview-thumb {
  border-color: rgba(214, 56, 56, 0.35);
  color: #b3261e;
}

.preview-card .preview-title {
  font-weight: 700;
  font-size: 0.88rem;
  margin: 0 0 2px;
}

.preview-card .preview-sub {
  font-size: 0.78rem;
  color: var(--color-muted);
  margin: 0;
}

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  padding: 20px;
  color: var(--color-muted);
  font-size: 0.8rem;
}