:root {
  --color-bg: #f5f6fa;
  --color-surface: #ffffff;
  --color-border: #e4e6ef;
  --color-text: #23252b;
  --color-text-muted: #6b6f7b;

  --color-assistant: #6c5ce7;
  --color-assistant-bg: #f2effd;
  --color-assistant-dark: #5b4bd6;

  --color-generate: #ff7a59;
  --color-generate-bg: #fff1ec;
  --color-generate-dark: #ee623d;

  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow-card: 0 2px 10px rgba(20, 20, 40, 0.06);
  --shadow-header: 0 1px 0 rgba(20, 20, 40, 0.05), 0 8px 24px rgba(20, 20, 40, 0.04);

  --font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic";
  --font-latin: "Inter", -apple-system, BlinkMacSystemFont;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-latin), var(--font-jp), sans-serif;
  background: linear-gradient(180deg, #f8f6ff 0%, #f5f6fa 260px, #f5f6fa 100%);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header ---------- */
.app-header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-header);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-header__logo {
  font-size: 28px;
  line-height: 1;
}

.app-header__title {
  font-size: 21px;
  font-weight: 800;
  margin: 0;
  letter-spacing: 0.01em;
}

/* ---------- Layout ---------- */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 72px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 20px 16px 48px;
    gap: 24px;
  }
}

/* ---------- Panel (shared) ---------- */
.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

@media (max-width: 480px) {
  .panel {
    padding: 20px;
  }
}

.panel__badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-assistant-bg);
  color: var(--color-assistant-dark);
  margin-bottom: 12px;
}

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

.panel__title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin: 0 0 10px;
}

.panel__desc {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
  margin: 0 0 28px;
}

.panel--assistant {
  border-top: 4px solid var(--color-assistant);
}

.panel--generate {
  border-top: 4px solid var(--color-generate);
}

/* ---------- Form fields ---------- */
.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 520px) {
  .field-row {
    grid-template-columns: 1fr;
  }
}

.field__label {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
}

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

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

.panel--generate .textarea:focus,
.panel--generate .select:focus {
  border-color: var(--color-generate);
  box-shadow: 0 0 0 3px rgba(255, 122, 89, 0.14);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236b6f7b'><path d='M5.5 7.5L10 12l4.5-4.5H5.5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 36px;
  cursor: pointer;
}

/* ---------- Dropzone ---------- */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 16px;
  cursor: pointer;
  background: #fafbfc;
  transition: border-color 0.15s ease, background 0.15s ease;
}

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

.dropzone__icon {
  font-size: 28px;
}

.dropzone__text {
  font-size: 14px;
  font-weight: 600;
}

.dropzone__hint {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- Chip group (radio) ---------- */
.chip-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chip {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 14px;
  cursor: pointer;
  background: #fafbfc;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.chip:hover {
  border-color: var(--color-assistant);
  box-shadow: 0 2px 8px rgba(108, 92, 231, 0.1);
}

.chip input {
  accent-color: var(--color-assistant);
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.chip:has(input:checked) {
  border-color: var(--color-assistant);
  background: var(--color-assistant-bg);
  font-weight: 700;
}

.chip:has(input:focus-visible) {
  outline: 2px solid var(--color-assistant);
  outline-offset: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  border: none;
  border-radius: var(--radius-md);
  padding: 15px 20px;
  min-height: 50px;
  font-size: 15px;
  font-weight: 700;
  font-family: inherit;
  letter-spacing: 0.01em;
  color: #fff;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

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

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

.btn:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.btn--assistant {
  background: var(--color-assistant);
  box-shadow: 0 6px 16px rgba(108, 92, 231, 0.3);
}

.btn--assistant:hover {
  background: var(--color-assistant-dark);
  box-shadow: 0 8px 20px rgba(108, 92, 231, 0.38);
}

.btn--generate {
  background: var(--color-generate);
  box-shadow: 0 6px 16px rgba(255, 122, 89, 0.3);
}

.btn--generate:hover {
  background: var(--color-generate-dark);
  box-shadow: 0 8px 20px rgba(255, 122, 89, 0.38);
}

.btn.is-loading {
  opacity: 0.7;
  cursor: progress;
}

/* ---------- Output (assistant) ---------- */
.output {
  margin-top: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-assistant-bg);
  padding: 18px 20px;
}

.output__label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-assistant-dark);
  margin-bottom: 10px;
}

.output__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-assistant);
  flex-shrink: 0;
}

.output__body {
  font-size: 14px;
  white-space: pre-wrap;
  color: var(--color-text);
}

.output--error {
  background: #fdecea;
  border-color: #f3c2bd;
}

.output--error .output__label {
  color: #b3261e;
}

.output--error .output__dot {
  background: #d93a2b;
}

.output--error .output__body {
  color: #8c281f;
}

/* ---------- Preview (generate) ---------- */
.preview {
  margin-top: 24px;
}

.preview__label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-generate-dark);
  margin-bottom: 12px;
}

.preview__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-generate);
  flex-shrink: 0;
}

.preview__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

@media (max-width: 700px) {
  .preview__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 460px) {
  .preview__grid {
    grid-template-columns: 1fr;
  }
}

.preview-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-generate-bg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.preview-card__page {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-generate-dark);
}

.preview-card__panels {
  font-size: 12px;
  color: var(--color-text-muted);
}

.preview-card__canvas {
  margin-top: 8px;
  aspect-ratio: 3 / 4;
  border-radius: 8px;
  border: 1.5px dashed #f0b8a4;
  background: repeating-linear-gradient(
    135deg,
    #ffffff,
    #ffffff 10px,
    #fff6f2 10px,
    #fff6f2 20px
  );
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  padding: 10px;
}

.preview-card__canvas-icon {
  font-size: 26px;
}

.preview-card__canvas-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-generate-dark);
}

.preview-card__canvas-hint {
  font-size: 11px;
  color: var(--color-text-muted);
}

.preview-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 6px;
}

.preview-card--loading .preview-card__canvas {
  border-style: dashed;
}

.spinner {
  width: 26px;
  height: 26px;
  border: 3px solid #f0d5cb;
  border-top-color: var(--color-generate);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.preview-card--error .preview-card__canvas {
  border-color: #f3c2bd;
  border-style: solid;
  background: #fdecea;
}

.preview-card--error .preview-card__canvas-label {
  color: #b3261e;
}

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  padding: 24px;
}