:root {
  --bg: #f4f5f9;
  --card: #ffffff;
  --text: #1f2330;
  --muted: #5d6273;          /* 白背景で 4.5:1 以上を確保 */
  --border: #e3e5ec;
  --field-bg: #fafbfc;
  --assistant: #0d9391;      /* 企画アシスタント：ティール（白文字とのコントラストを確保） */
  --assistant-soft: #e8f6f5;
  --generate: #7c3aed;       /* 漫画生成：パープル */
  --generate-soft: #f3edfe;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(20, 24, 40, 0.04), 0 8px 24px rgba(20, 24, 40, 0.06);
  --font: "Inter", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 400px at 10% -10%, var(--assistant-soft), transparent 70%),
    radial-gradient(1200px 400px at 90% -10%, var(--generate-soft), transparent 70%),
    var(--bg);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* スクリーンリーダー・キーボード操作には残しつつ、見た目は隠す */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Header ---------- */
.app-header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 64px;
}
.logo-mark {
  flex-shrink: 0;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--assistant), var(--generate));
  color: #fff;
  font-weight: 800;
  display: grid;
  place-items: center;
}
.app-header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.badge-mock {
  margin-left: auto;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 999px;
}

/* ---------- Layout ---------- */
.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 40px;
  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;
}
/* 上部に細いアクセントライン */
.panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: var(--accent);
}
.panel-assistant { --accent: var(--assistant); --soft: var(--assistant-soft); }
.panel-generate  { --accent: var(--generate);  --soft: var(--generate-soft); }

.panel-head {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.step {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--soft);
  padding: 3px 12px;
  border-radius: 999px;
}
.panel h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  line-height: 1.4;
  margin: 12px 0 8px;
}
.h2-icon {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  color: var(--accent);
  background: var(--soft);
}
.h2-icon svg { width: 20px; height: 20px; }
.desc {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- Form ---------- */
.field { margin-bottom: 24px; }
.field > label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 8px;
}
select, textarea {
  width: 100%;
  font: inherit;
  font-size: 16px; /* iOSでのズーム防止 */
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  transition: border-color .15s, box-shadow .15s, background-color .15s;
}
select { min-height: 48px; cursor: pointer; }
textarea { resize: vertical; min-height: 120px; }
select:hover, textarea:hover { border-color: #cfd3dd; }
select:focus, textarea:focus {
  outline: none;
  background: var(--card);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--soft);
}
::placeholder { color: #9a9fae; }

.field-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0 16px;
  align-items: end;
}

.field > .upload-box { /* .field > label の display: block を上書き */
  margin-bottom: 0;
  font-weight: 400;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 28px 16px;
  border: 1.5px dashed color-mix(in srgb, var(--accent) 55%, #fff);
  border-radius: 12px;
  background: color-mix(in srgb, var(--soft) 60%, #fff);
  text-align: center;
  cursor: pointer;
  transition: background-color .15s, border-color .15s, box-shadow .15s;
}
.upload-box:hover {
  background: var(--soft);
  border-color: var(--accent);
}
.upload-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--soft);
}
.upload-icon {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: 50%;
  color: var(--accent);
  background: var(--card);
  box-shadow: 0 2px 8px rgba(20, 24, 40, 0.08);
}
.upload-icon svg { width: 22px; height: 22px; }
.upload-text { font-weight: 700; font-size: 0.95rem; }
.upload-text small { color: var(--muted); font-weight: 400; font-size: 0.85rem; }

/* ---------- Buttons ---------- */
.btn {
  display: block;
  width: 100%;
  min-height: 52px;
  border: none;
  border-radius: 12px;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 30%, transparent);
  transition: transform .1s, filter .15s, box-shadow .15s;
}
.btn:hover {
  filter: brightness(1.07);
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 38%, transparent);
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, #fff);
  outline-offset: 3px;
}
.btn:disabled {
  opacity: 0.6;
  cursor: wait;
  filter: none;
  box-shadow: none;
}

/* ---------- Results ---------- */
.result-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 12px;
}
.result-box {
  margin-top: 24px;
  padding: 20px 24px;
  background: color-mix(in srgb, var(--soft) 70%, #fff);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, #fff);
  border-radius: 12px;
}
.answer { white-space: pre-wrap; word-break: break-word; }

.hint {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  margin: 10px 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--muted);
}
.hint-icon {
  flex-shrink: 0;
  width: 16px; height: 16px;
  margin-top: 0.2em;
}

.error-box {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: #fdf0ef;
  color: #b42318;
  border: 1px solid #f5c9c6;
  font-size: 0.9rem;
}

.tag-future {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 12px 0 0;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--soft);
  padding: 4px 12px;
  border-radius: 999px;
}
.tag-future svg { width: 14px; height: 14px; }

.notice-box {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: #fff8e6;
  color: #7a4b00;
  border: 1px solid #f3dca4;
  font-size: 0.9rem;
}

.preview-area {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
}
.preview-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--card);
  transition: box-shadow .15s, transform .15s;
}
.preview-card:hover {
  box-shadow: 0 6px 18px rgba(20, 24, 40, 0.08);
  transform: translateY(-2px);
}
.preview-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  font-size: 0.8rem;
  border-bottom: 1px solid var(--border);
}
.preview-card-head strong { font-size: 0.9rem; }
.preview-card-head span { color: var(--muted); }
.preview-image {
  aspect-ratio: 3 / 4;
  margin: 12px;
  border-radius: 8px;
  background: var(--soft);
  display: grid;
  gap: 4px;
  padding: 6px;
}
.preview-image .koma {
  background: #fff;
  border: 1.5px solid color-mix(in srgb, var(--accent) 35%, #fff);
  border-radius: 3px;
}
.preview-caption {
  padding: 0 12px 14px;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--muted);
  text-align: center;
}
.preview-caption b {
  display: block;
  color: var(--text);
  font-size: 0.85rem;
  margin-bottom: 2px;
}

.footer {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding-bottom: 40px;
}

/* ---------- Tablet ---------- */
@media (max-width: 960px) {
  .main-grid { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; }
  .main-grid { max-width: 720px; } /* 1列時に横へ伸びすぎないように */
}

/* ---------- Smartphone ---------- */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .header-inner { height: 56px; }
  .main-grid { padding-top: 20px; gap: 20px; }
  .panel { padding: 24px 18px; }
  .panel-head { margin-bottom: 20px; padding-bottom: 20px; }
  .panel h2 { font-size: 1.2rem; }
  .app-header h1 { font-size: 1.05rem; white-space: nowrap; }
  .badge-mock { display: none; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .preview-grid { grid-template-columns: 1fr; }
  .preview-image { aspect-ratio: 4 / 5; }
  .result-box { padding: 18px; }
}