:root {
  /* ベース */
  --bg: #f4f5f9;
  --card: #ffffff;
  --text: #1c1f2e;
  --muted: #5f6475;       /* 白背景・淡色背景どちらでも 4.5:1 以上 */
  --border: #e4e6ee;
  --field-bg: #fbfbfd;

  /* アシスタント = 紫 */
  --assist: #6a45f5;      /* 白文字とのコントラスト 5.5:1 */
  --assist-dark: #5733e0;
  --assist-light: #a58cff;
  --assist-soft: #f1edff;

  /* 生成 = オレンジ */
  --generate: #c7420e;    /* 白文字とのコントラスト 5.0:1 */
  --generate-dark: #a93609;
  --generate-light: #ff8a5c;
  --generate-soft: #fff1ec;

  /* 状態 */
  --danger: #b3261e;
  --danger-soft: #fdecea;

  /* 形・影 */
  --radius: 20px;
  --radius-sm: 12px;
  --shadow-sm: 0 1px 2px rgba(28, 31, 46, 0.04);
  --shadow: 0 1px 2px rgba(28, 31, 46, 0.04), 0 8px 28px rgba(28, 31, 46, 0.07);

  --font: "Inter", "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  background:
    radial-gradient(900px 400px at 0% 0%, rgba(106, 69, 245, 0.06), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(255, 138, 92, 0.07), transparent 60%),
    var(--bg);
  background-repeat: no-repeat;
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- ヘッダー ---------- */
.app-header {
  position: relative;
  background: linear-gradient(135deg, #171a2a 0%, #262a44 100%);
  color: #fff;
  padding: 24px 0;
}
/* 2つの機能色を使った細いアクセントライン */
.app-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--assist-light), var(--generate-light));
}
.app-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.logo::before {
  content: "";
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--assist-light), var(--generate-light));
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25);
}
.tagline {
  margin: 0;
  color: #c3c6d4;
  font-size: 0.95rem;
}

/* ---------- 2カラム ---------- */
.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 48px;
  align-items: start;
}

.panel {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
/* 上部の色帯（STEPごとに色分け） */
.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}
.panel-assist::before { background: linear-gradient(90deg, var(--assist), var(--assist-light)); }
.panel-generate::before { background: linear-gradient(90deg, var(--generate), var(--generate-light)); }

.panel-head {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.panel-head h2 {
  margin: 12px 0 8px;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.desc { margin: 0; color: var(--muted); font-size: 0.95rem; }

.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border-radius: 999px;
}
.panel-assist .badge { background: var(--assist-soft); color: var(--assist); }
.panel-generate .badge { background: var(--generate-soft); color: var(--generate); }

/* ---------- 入力欄 ---------- */
.field { margin-bottom: 24px; }
.field > label {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

select, textarea {
  width: 100%;
  font: inherit;
  font-size: 16px; /* iOSでズームされないように16px */
  line-height: 1.6;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--field-bg);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s, background-color 0.15s;
}
select {
  min-height: 48px;
  padding-right: 44px;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%235f6475' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' viewBox='0 0 24 24'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}
textarea { resize: vertical; min-height: 120px; }
textarea::placeholder { color: #8a8fa0; }
select:hover, textarea:hover { border-color: #cfd2de; }
select:focus, textarea:focus { outline: none; background-color: #fff; }
.panel-assist select:focus, .panel-assist textarea:focus { border-color: var(--assist); box-shadow: 0 0 0 4px var(--assist-soft); }
.panel-generate select:focus, .panel-generate textarea:focus { border-color: var(--generate); box-shadow: 0 0 0 4px var(--generate-soft); }

.field > label.upload {
  display: flex;
  margin-bottom: 0;
  font-weight: 400;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 32px 16px;
  border: 2px dashed #cbbfff;
  border-radius: var(--radius-sm);
  background: var(--assist-soft);
  text-align: center;
  cursor: pointer;
  color: var(--muted);
  line-height: 1.6;
  transition: background 0.2s, border-color 0.2s;
}
.upload:hover { background: #e9e2ff; border-color: var(--assist-light); }
.upload-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #fff;
  font-size: 1.6rem;
  box-shadow: var(--shadow-sm);
}
.upload-text { font-weight: 500; color: var(--text); }
.upload small { font-size: 0.85rem; font-weight: 400; color: var(--muted); }

/* ---------- ボタン ---------- */
.btn {
  display: block;
  width: 100%;
  min-height: 56px;
  padding: 16px;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.2s, filter 0.2s;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.06); }
.btn:active { transform: translateY(1px); filter: brightness(0.97); }
.btn:focus-visible { outline: 3px solid var(--text); outline-offset: 3px; }
.btn-assist {
  background: linear-gradient(135deg, var(--assist), var(--assist-dark));
  box-shadow: 0 8px 20px rgba(106, 69, 245, 0.28);
}
.btn-assist:hover { box-shadow: 0 12px 24px rgba(106, 69, 245, 0.34); }
.btn-generate {
  background: linear-gradient(135deg, var(--generate), var(--generate-dark));
  box-shadow: 0 8px 20px rgba(199, 66, 14, 0.26);
}
.btn-generate:hover { box-shadow: 0 12px 24px rgba(199, 66, 14, 0.32); }
.btn:disabled {
  opacity: 0.6;
  cursor: wait;
  transform: none;
  filter: none;
  box-shadow: none;
}

/* ---------- アシスタント出力 ---------- */
.output {
  margin-top: 24px;
  padding: 20px 24px;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--assist-soft), #f8f6ff);
  border: 1px solid #e3dbff;
  font-size: 0.95rem;
}
.output-title {
  font-weight: 700;
  color: var(--assist);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid #e3dbff;
}
.output p { margin: 0 0 4px; }
.output ul { margin: 0; padding-left: 1.2em; }
.output li { margin-bottom: 4px; }

/* ---------- 生成プレビュー ---------- */
.preview-head {
  margin: 32px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.preview-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.2s;
}
.preview-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.preview-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 0.85rem;
  background: var(--generate-soft);
}
.preview-card-head strong { color: var(--generate); font-weight: 700; }
.preview-card-head span { color: var(--muted); }
.preview-image {
  aspect-ratio: 3 / 4;
  margin: 12px;
  border: 2px solid var(--text);
  border-radius: 4px;
  display: grid;
  gap: 4px;
  padding: 4px;
  background: #fff;
}
.preview-image .koma {
  border-radius: 2px;
  background:
    repeating-linear-gradient(135deg, transparent 0 8px, rgba(28, 31, 46, 0.035) 8px 9px),
    #eef0f5;
}
.preview-card-body { padding: 0 12px 12px; font-size: 0.85rem; line-height: 1.6; }
.preview-card-body .label { font-weight: 700; margin: 0 0 2px; }
.preview-card-body .note { margin: 0; color: var(--muted); }

/* ---------- API連携用 ---------- */
.output-text { white-space: pre-wrap; line-height: 1.8; }

.hint {
  margin: 8px 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--muted);
}
.panel-head + .hint {
  margin: 0 0 24px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: #f6f7fa;
}

.notice {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--generate-soft);
  border: 1px solid #ffd8c8;
  color: #7a2a08;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.7;
}

.error-box {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
  border: 1px solid #f7cdc9;
  color: var(--danger);
  font-size: 0.9rem;
  font-weight: 700;
}

.upload-preview {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field-bg);
}
.upload-preview img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.link-btn {
  min-height: 44px;
  padding: 8px 12px;
  background: none;
  border: none;
  border-radius: 8px;
  color: var(--assist);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}
.link-btn:hover { background: var(--assist-soft); }
.link-btn:focus-visible { outline: 2px solid var(--assist); outline-offset: 2px; }

.app-footer {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.7;
  padding: 0 16px 40px;
}

/* ---------- タブレット ---------- */
@media (max-width: 960px) {
  /* 1カラム時は横に伸びすぎないよう幅を制限 */
  .layout { grid-template-columns: 1fr; gap: 24px; max-width: 760px; }
}

/* ---------- スマホ ---------- */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .app-header { padding: 20px 0; }
  .logo { font-size: 1.25rem; gap: 10px; }
  .logo::before { width: 28px; height: 28px; border-radius: 8px; }
  .tagline { font-size: 0.85rem; }
  .layout { padding-top: 24px; padding-bottom: 32px; gap: 20px; }
  .panel { padding: 24px 20px; border-radius: 16px; }
  .panel-head { margin-bottom: 20px; padding-bottom: 20px; }
  .panel-head h2 { font-size: 1.25rem; }
  .field { margin-bottom: 20px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .output { padding: 16px; }
  .preview-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .preview-image { margin: 8px; }
  .preview-card-head,
  .preview-card-body { padding-left: 8px; padding-right: 8px; }
  .preview-card-head { flex-direction: column; align-items: flex-start; gap: 0; }
}