/* ========== デザイントークン ========== */
:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2330;
  --muted: #5f6675;        /* 補足文字：背景とのコントラストを確保した濃さ */
  --border: #e3e6ee;
  --field-bg: #f8f9fc;
  --assist: #0e7f7e;       /* アシスタント：ティール（白文字が読める濃さ） */
  --assist-soft: #e8f6f5;
  --gen: #7c3aed;          /* 漫画生成：パープル */
  --gen-soft: #f3eefe;
  --danger: #c81e1e;
  --danger-soft: #fdf0f0;
  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(20, 30, 60, .04), 0 8px 24px rgba(20, 30, 60, .06);
  --font: "Inter", "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  /* 英字は Inter、日本語は Noto Sans JP／ヒラギノ／游ゴシックで表示 */
  font-family: var(--font);
  font-size: 16px;
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(14, 127, 126, .07), transparent 60%),
    radial-gradient(1200px 400px at 90% -10%, rgba(124, 58, 237, .07), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }

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

/* ========== ヘッダー ========== */
.header {
  background: rgba(255, 255, 255, .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 {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-mark {
  flex-shrink: 0;
  width: 36px; height: 36px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--assist), var(--gen));
  color: #fff; font-weight: 700;
}
.app-name { font-size: 1.2rem; font-weight: 700; margin: 0; letter-spacing: -.01em; line-height: 1.3; white-space: nowrap; }
.badge-mock {
  margin-left: auto;
  font-size: .8rem;
  padding: 4px 12px;
  border-radius: 999px;
  background: #eef0f5;
  color: var(--muted);
  white-space: nowrap;
}

/* ========== メイン：PCは2カラム ========== */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

/* ========== カード ========== */
.panel {
  position: relative;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}
/* カード上部の細いアクセントライン（エリアの色分け） */
.panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
}
.panel-assistant { --accent: var(--assist); --accent-soft: var(--assist-soft); --accent-ring: rgba(14, 127, 126, .18); }
.panel-generate  { --accent: var(--gen);    --accent-soft: var(--gen-soft);    --accent-ring: rgba(124, 58, 237, .18); }
.panel::before { background: var(--accent); }

.panel-head { margin-bottom: 28px; }
.panel-head h2 {
  display: flex; align-items: center; gap: 10px;
  margin: 12px 0 8px;
  font-size: 1.4rem; font-weight: 700; line-height: 1.45;
  word-break: auto-phrase; text-wrap: balance; /* 見出しの1文字だけの改行を防ぐ */
}
.icon-head {
  width: 36px; height: 36px; padding: 8px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
}
.lead { margin: 0; color: var(--muted); font-size: .95rem; }
.step {
  display: inline-block;
  font-size: .75rem; font-weight: 700; letter-spacing: .08em;
  padding: 3px 12px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}

/* ========== フォーム ========== */
.field { margin-bottom: 24px; display: flex; flex-direction: column; gap: 8px; }
.field > label, .field > .label { font-weight: 600; font-size: .9rem; line-height: 1.5; display: flex; align-items: center; gap: 8px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.tag-required, .tag-optional {
  font-size: .72rem; font-weight: 700; line-height: 1;
  padding: 4px 8px; border-radius: 6px;
}
.tag-required { background: var(--accent-soft); color: var(--accent); }
.tag-optional { background: #eef0f5; color: var(--muted); }

select, textarea {
  width: 100%;
  font: inherit;
  font-size: 16px; /* iOSでのズーム防止 */
  line-height: 1.7;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background-color: var(--field-bg);
  color: var(--text);
  transition: border-color .15s, box-shadow .15s, background-color .15s;
}
select {
  min-height: 48px;
  padding-right: 40px;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  /* 下向き矢印 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%235f6675' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}
textarea { resize: vertical; min-height: 128px; }
textarea::placeholder { color: #8b919e; }
select:hover, textarea:hover { border-color: #cfd4df; }
/* フォーカス時はエリアの色でリングを表示 */
select:focus, textarea:focus {
  outline: none;
  background-color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}
/* 入力エラー：入力欄の枠を赤くし、すぐ下にメッセージ */
textarea[aria-invalid="true"] { border-color: var(--danger); box-shadow: 0 0 0 3px rgba(200, 30, 30, .12); background-color: #fff; }

/* エラー表示（入力欄の下・ボタンの下で共通） */
.field-error, .error-box {
  display: flex; gap: 8px; align-items: flex-start;
  margin: 0;
  color: var(--danger);
  font-size: .9rem; font-weight: 600; line-height: 1.6;
}
.field-error[hidden], .error-box[hidden] { display: none; }
.field-error::before, .error-box::before {
  content: "";
  flex-shrink: 0;
  width: 18px; height: 18px; margin-top: 2px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M12 8v4M12 16h.01'/%3E%3C/svg%3E") center / contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M12 8v4M12 16h.01'/%3E%3C/svg%3E") center / contain no-repeat;
}
.error-box {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
  border: 1px solid #f6cccc;
  font-weight: 500;
}

/* ========== アップロード ========== */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}
.upload {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 22px;
  border: 1.5px dashed #a9d8d6;
  border-radius: var(--radius-sm);
  background: var(--assist-soft);
  cursor: pointer;
  line-height: 1.6;
  transition: background .2s, border-color .2s;
}
.upload:hover { background: #dcf1ef; border-color: var(--assist); }
.upload:focus-within { outline: 3px solid rgba(14, 127, 126, .35); outline-offset: 2px; }
.upload-icon {
  flex-shrink: 0;
  width: 56px; height: 56px;
  display: grid; place-items: center;
  background: #fff;
  border-radius: var(--radius-sm);
  color: var(--assist);
}
.upload-icon .icon { width: 24px; height: 24px; }
.upload-icon img { width: 56px; height: 56px; object-fit: cover; border-radius: var(--radius-sm); display: block; }
.upload-text { font-weight: 600; min-width: 0; overflow-wrap: anywhere; }
.upload-text small { display: inline-block; margin-top: 2px; color: var(--muted); font-weight: 400; font-size: .875rem; }

/* ========== ボタン ========== */
.btn {
  width: 100%;
  min-height: 52px;
  padding: 14px 20px;
  font: inherit; font-size: 1rem; font-weight: 700; letter-spacing: .04em;
  color: #fff;
  background: var(--accent);
  border: none; border-radius: var(--radius-sm);
  cursor: pointer;
  box-shadow: 0 6px 16px var(--accent-ring);
  transition: transform .1s, box-shadow .2s, filter .2s, opacity .2s;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.06); box-shadow: 0 10px 22px var(--accent-ring); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid var(--accent-ring); outline-offset: 3px; }
.btn:disabled { opacity: .6; cursor: wait; transform: none; filter: none; }

/* ========== アシスタント回答 ========== */
.result {
  margin-top: 24px;
  padding: 20px;
  border-radius: var(--radius-sm);
  background: var(--assist-soft);
  border: 1px solid #cfe9e7;
}
.result-title { display: flex; align-items: center; gap: 8px; font-weight: 700; margin-bottom: 8px; color: var(--assist); }
.result-body { margin: 0; font-size: .95rem; white-space: pre-wrap; }
.result .icon-error { display: none; }
.result.is-error { background: var(--danger-soft); border-color: #f6cccc; color: #8f1a1a; }
.result.is-error .result-title { color: var(--danger); }
.result.is-error .icon-normal { display: none; }
.result.is-error .icon-error { display: block; }

/* ========== 生成プレビュー ========== */
.preview-title {
  display: flex; align-items: center; gap: 8px;
  margin: 32px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-weight: 700;
  color: var(--gen);
}
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
}
.preview-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #fff;
  transition: box-shadow .2s;
}
.preview-card:hover { box-shadow: 0 6px 18px rgba(20, 30, 60, .08); }
.preview-meta {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px;
  background: var(--gen-soft);
  font-size: .875rem;
}
.preview-meta strong { color: var(--gen); }
.preview-image {
  aspect-ratio: 3 / 4;
  margin: 12px;
  display: grid; gap: 4px;
}
.preview-image .koma {
  background: repeating-linear-gradient(45deg, #f6f4fb, #f6f4fb 6px, #eeeaf7 6px, #eeeaf7 12px);
  border: 2px solid #2b2b38;
  border-radius: 2px;
}
.preview-card.is-loading .preview-image { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .4; } }
.preview-result { display: block; margin: 12px; }
.preview-result img { width: 100%; aspect-ratio: 3 / 4; object-fit: cover; display: block; border-radius: 6px; border: 1px solid var(--border); }
.preview-caption { padding: 0 12px 14px; font-size: .875rem; line-height: 1.6; color: var(--muted); text-align: center; }
.preview-caption b { display: block; color: var(--text); font-size: .875rem; }

.footer { text-align: center; color: var(--muted); font-size: .875rem; line-height: 1.7; padding: 8px 16px 40px; }

/* ========== タブレット（768〜1023px）：1カラム。横に伸びすぎないよう幅を制限 ========== */
@media (max-width: 1023px) {
  .main { grid-template-columns: 1fr; max-width: 720px; padding: 32px 24px; gap: 28px; }
  .preview-grid { grid-template-columns: repeat(2, 1fr); }
}
/* ========== スマホ（〜767px） ========== */
@media (max-width: 767px) {
  .header-inner { padding: 10px 16px; gap: 10px; }
  .logo-mark { width: 32px; height: 32px; border-radius: 9px; }
  .app-name { font-size: 1.05rem; }
  .badge-mock { display: none; } /* 狭い画面ではタイトルを優先（フッターにも記載あり） */
  .main { padding: 20px 16px; gap: 20px; }
  .panel { padding: 24px 20px; }
  .panel-head { margin-bottom: 24px; }
  .panel-head h2 { font-size: 1.2rem; }
  .icon-head { width: 32px; height: 32px; padding: 7px; }
  /* スマホでも小さな文字を14px未満にしない */
  .step, .tag-required, .tag-optional { font-size: .875rem; }
  .tag-required, .tag-optional { padding: 3px 8px; }
  .field { margin-bottom: 20px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .upload { padding: 16px; gap: 14px; }
  .preview-grid { grid-template-columns: 1fr; }
  .preview-image { max-width: 280px; margin: 12px auto; }
  .preview-result { max-width: 320px; margin: 12px auto; }
}