:root {
  --bg: #f4f5f9;
  --card: #ffffff;
  --text: #1c1f2e;
  --muted: #5d6276;           /* 白・淡色背景でもコントラスト4.5:1以上 */
  --border: #e2e4ec;
  --input-bg: #f9fafc;
  --assistant: #6346ee;       /* アシスタント = 紫 */
  --assistant-soft: #f1eeff;
  --generate: #d9480f;        /* 生成 = オレンジ（白文字が読める濃さ） */
  --generate-ink: #b23c0c;    /* 淡色背景上のオレンジ文字用 */
  --generate-soft: #fff1ea;
  --danger: #c62828;
  --danger-soft: #fdeeee;
  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(28, 31, 46, .04), 0 8px 24px rgba(28, 31, 46, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 16px;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Header ---------- */
.app-header {
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
  min-height: 72px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--assistant), var(--generate));
  flex-shrink: 0;
}
.tagline { margin: 0; color: var(--muted); font-size: 0.9rem; }

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

.panel {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border-top: 4px solid;
}
.panel-assistant { border-top-color: var(--assistant); }
.panel-generate  { border-top-color: var(--generate); }

.panel-head { margin-bottom: 28px; }
.panel-head h2 { margin: 12px 0 8px; font-size: 1.4rem; font-weight: 800; line-height: 1.4; }
.panel-desc { margin: 0; color: var(--muted); font-size: 0.95rem; }

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 4px 12px;
  border-radius: 999px;
}
.panel-assistant .badge { background: var(--assistant-soft); color: var(--assistant); }
.panel-generate  .badge { background: var(--generate-soft);  color: var(--generate-ink); }

/* ---------- Form ---------- */
.field { margin-bottom: 20px; }
.field-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

select, textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;              /* 16px：iOSの自動ズーム防止も兼ねる */
  line-height: 1.6;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  min-height: 48px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
textarea { resize: vertical; min-height: 120px; }
select { cursor: pointer; }
select:hover, textarea:hover { border-color: #c9ccd8; }
select:focus, textarea:focus { outline: none; background: #fff; }
.panel-assistant select:focus, .panel-assistant textarea:focus {
  border-color: var(--assistant); box-shadow: 0 0 0 4px var(--assistant-soft);
}
.panel-generate select:focus, .panel-generate textarea:focus {
  border-color: var(--generate); box-shadow: 0 0 0 4px var(--generate-soft);
}
::placeholder { color: #8a8fa3; }
textarea[aria-invalid="true"] { border-color: var(--danger); background: #fff; box-shadow: 0 0 0 4px var(--danger-soft); }

/* ---------- Icons（線の太さ・サイズを統一） ---------- */
.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* エラー文言の先頭に付ける注意アイコン */
.field-error::before, .error-box::before, .result.is-error .answer::before {
  content: "";
  display: inline-block;
  width: 1.1em;
  height: 1.1em;
  margin-right: 6px;
  vertical-align: -0.2em;
  background: currentColor;
  -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2" stroke-linecap="round"><circle cx="12" cy="12" r="10"/><path d="M12 8v4M12 16h.01"/></svg>') center / contain no-repeat;
          mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2" stroke-linecap="round"><circle cx="12" cy="12" r="10"/><path d="M12 8v4M12 16h.01"/></svg>') center / contain no-repeat;
}

.field-error {
  margin: 8px 0 0;
  color: var(--danger);
  font-size: 0.88rem;
  font-weight: 600;
}

.upload {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border: 2px dashed #cfc6fb;
  border-radius: var(--radius-sm);
  background: var(--assistant-soft);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.upload:hover { background: #e9e4ff; border-color: var(--assistant); }
.upload-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: 12px;
  background: #fff;
  color: var(--assistant);
}
.upload-icon .icon { width: 26px; height: 26px; }
.upload-icon img { width: 56px; height: 56px; object-fit: cover; border-radius: 12px; display: block; }
.upload-text { font-size: 0.95rem; font-weight: 600; line-height: 1.6; }
.upload-text small { color: var(--muted); font-weight: 400; font-size: 0.82rem; }

/* ---------- Buttons ---------- */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 56px;
  margin-top: 4px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: transform .12s, box-shadow .15s, filter .15s;
}
.btn:hover { filter: brightness(1.06); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 3px solid var(--text); outline-offset: 3px; }
.btn:disabled { opacity: .75; cursor: wait; transform: none; }

/* 処理中：アイコンをスピナーに置き換える */
.btn.is-loading .icon { display: none; }
.btn.is-loading::before {
  content: "";
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, .4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.btn-assistant { background: var(--assistant); box-shadow: 0 8px 20px rgba(99, 70, 238, .28); }
.btn-generate  { background: var(--generate);  box-shadow: 0 8px 20px rgba(217, 72, 15, .25); }

/* ---------- Results ---------- */
.result-title { font-weight: 700; font-size: 0.85rem; color: var(--muted); }

.result {
  margin-top: 28px;
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  background: var(--assistant-soft);
  border-left: 4px solid var(--assistant);
  font-size: 0.95rem;
}
.answer { margin-top: 8px; white-space: pre-wrap; word-break: break-word; }
.result.is-error { background: var(--danger-soft); border-left-color: var(--danger); color: var(--danger); }

.error-box {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.92rem;
  font-weight: 600;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 32px 0 14px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.preview-meta {
  font-size: 0.8rem;
  background: var(--generate-soft);
  color: var(--generate-ink);
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.preview-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #fff;
  transition: box-shadow .15s, transform .15s;
}
.preview-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.preview-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  background: #fafbfd;
  border-bottom: 1px solid var(--border);
}
.preview-card-head span:last-child { color: var(--muted); font-weight: 500; font-size: 0.78rem; }
.preview-image {
  aspect-ratio: 2 / 3;            /* 生成画像（1024x1536）と同じ縦横比 */
  margin: 12px;
  display: grid;
  gap: 4px;
}
.preview-image .koma {
  background: repeating-linear-gradient(45deg, #f5f5f8, #f5f5f8 6px, #ececf1 6px, #ececf1 12px);
  border: 2px solid #2a2d3a;
  border-radius: 2px;
}
.preview-result { display: block; margin: 12px; }
.preview-result img { width: 100%; aspect-ratio: 2 / 3; object-fit: cover; display: block; border-radius: 6px; }
.preview-caption {
  padding: 0 14px 14px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--muted);
  text-align: center;
}
.preview-caption strong { display: block; color: var(--text); font-size: 0.85rem; }
.preview-card.is-error { border-color: #f3c4c4; }
.preview-card.is-error .preview-caption { color: var(--danger); }

.loading .preview-image { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .4; } }

.app-footer { text-align: center; color: var(--muted); font-size: 0.82rem; padding-bottom: 40px; }

/* ---------- Responsive ---------- */
/* タブレット：パネルを縦に並べ、横に伸びすぎないよう幅を抑える */
@media (max-width: 960px) {
  .main-grid { grid-template-columns: 1fr; max-width: 720px; gap: 28px; }
  .preview-grid { grid-template-columns: repeat(2, 1fr); }
}

/* スマホ：すべて縦並び */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .app-header { position: static; }   /* 画面の縦幅を確保するため、スマホでは固定しない */
  .header-inner { min-height: 60px; }
  .logo { font-size: 1.15rem; }
  .logo-mark { width: 28px; height: 28px; border-radius: 8px; }
  .tagline { font-size: 0.82rem; }
  .main-grid { padding-top: 20px; gap: 20px; }
  .panel { padding: 24px 18px; border-radius: 16px; }
  .panel-head { margin-bottom: 22px; }
  .panel-head h2 { font-size: 1.25rem; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .upload { padding: 16px; }
  .preview-grid { grid-template-columns: 1fr; }
  .preview-card:hover { transform: none; }
}