/* =========================================================
   Manga Creative Studio
   色・余白・角丸はここの変数で統一しています
   ========================================================= */
:root {
  /* ベース */
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-sub: #f9fafc;
  --text: #1d2433;
  --text-sub: #545d6e;          /* 白背景でコントラスト 6:1 以上 */
  --border: #e4e7ee;

  /* メイン（アシスタント）とアクセント（生成） */
  --primary: #5b4fe0;
  --primary-hover: #4a3fd0;
  --primary-soft: #efedfd;
  --accent: #0d8f80;
  --accent-hover: #0b7a6d;
  --accent-soft: #e5f5f3;

  /* 状態色（エラーだけ赤系） */
  --danger: #b42318;
  --danger-soft: #fef3f2;

  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);

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

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 400px at 0% 0%, #eceafd 0%, transparent 60%),
    radial-gradient(900px 400px at 100% 0%, #e3f4f1 0%, transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}

svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Header ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 38px; height: 38px;
  padding: 8px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
}
.logo h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.steps { display: flex; align-items: center; gap: 8px; }
.step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 6px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background .15s;
}
.step span {
  display: grid;
  place-items: center;
  width: 24px; height: 24px;
  border-radius: 50%;
  color: #fff;
  font-size: 12px;
}
.step-assistant { color: var(--primary); background: var(--primary-soft); }
.step-assistant span { background: var(--primary); }
.step-generate { color: var(--accent); background: var(--accent-soft); }
.step-generate span { background: var(--accent); }
.step-arrow { color: #a3aab8; }
.step-assistant:hover { background: #e4e1fc; }
.step-generate:hover { background: #d4efeb; }
.step:focus-visible { outline: 3px solid currentColor; outline-offset: 2px; }

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

/* ---------- Panel ---------- */
.panel {
  --c: var(--primary);
  --c-hover: var(--primary-hover);
  --c-soft: var(--primary-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 32px;
  scroll-margin-top: 88px;
}
.panel-generate {
  --c: var(--accent);
  --c-hover: var(--accent-hover);
  --c-soft: var(--accent-soft);
}

.panel-head { display: flex; align-items: center; gap: 16px; }
.panel-icon {
  flex-shrink: 0;
  width: 52px; height: 52px;
  padding: 13px;
  border-radius: 14px;
  background: var(--c-soft);
  color: var(--c);
}
.panel-head h2 {
  margin: 2px 0 0;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c);
}
.panel-desc {
  margin: 16px 0 28px;
  color: var(--text-sub);
  font-size: 15px;
}

/* ---------- Form ---------- */
.form { display: flex; flex-direction: column; gap: 22px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field > label { font-size: 15px; font-weight: 700; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

select, textarea {
  width: 100%;
  font: inherit;
  font-size: 16px;
  color: var(--text);
  background: var(--surface-sub);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
select {
  min-height: 50px;
  appearance: none;
  padding-right: 44px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23545d6e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 18px;
  cursor: pointer;
}
textarea { resize: vertical; min-height: 120px; }
textarea::placeholder { color: #8a92a3; }
select:hover, textarea:hover { border-color: #cdd2dc; }
select:focus, textarea:focus {
  outline: none;
  background-color: #fff;
  border-color: var(--c);
  box-shadow: 0 0 0 4px var(--c-soft);
}

/* Upload */
.upload {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 28px 16px;
  border: 1.5px dashed #c5bff5;
  border-radius: var(--radius-md);
  background: var(--primary-soft);
  cursor: pointer;
  text-align: center;
  transition: background .15s, border-color .15s;
}
.upload:hover { background: #e6e3fc; border-color: var(--primary); }
.upload input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.upload:focus-within { box-shadow: 0 0 0 4px var(--primary-soft); border-color: var(--primary); }
.upload-icon {
  width: 44px; height: 44px;
  padding: 10px;
  margin-bottom: 4px;
  border-radius: 50%;
  background: #fff;
  color: var(--primary);
}
/* 画像選択後はアイコンの代わりにサムネイルを表示 */
.upload-thumb {
  width: 96px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: 0 4px 12px rgba(16, 24, 40, .08);
}
.upload.has-image .upload-icon { display: none; }
.upload-text {
  max-width: 100%;
  font-weight: 700;
  color: var(--primary);
  overflow-wrap: anywhere;
}
.upload-hint { font-size: 13px; color: var(--text-sub); }
.note { margin: 0; font-size: 13px; line-height: 1.6; color: var(--text-sub); }

/* Buttons */
.btn {
  width: 100%;
  min-height: 54px;
  border: none;
  border-radius: var(--radius-md);
  padding: 14px 20px;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  color: #fff;
  background: var(--c);
  box-shadow: 0 1px 2px rgba(16, 24, 40, .08), 0 6px 16px -4px var(--c);
  cursor: pointer;
  transition: background .15s, transform .1s, box-shadow .15s;
}
.btn:hover { background: var(--c-hover); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 3px solid var(--c-soft); outline-offset: 2px; }
.btn:disabled { opacity: .75; cursor: wait; transform: none; }

/* 読み込み中のスピナー（ボタン・回答欄で共通） */
.btn.is-loading,
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.loading { justify-content: flex-start; }
.btn.is-loading::before,
.loading::before {
  content: "";
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border: 2.5px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Result ---------- */
.result {
  margin-top: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-sub);
  overflow: hidden;
}
.result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  background: #fff;
}
.result-label { font-size: 14px; font-weight: 700; }
.chip {
  font-size: 12px;
  font-weight: 700;
  color: var(--c);
  background: var(--c-soft);
  padding: 3px 10px;
  border-radius: 999px;
}
.result-body { padding: 20px; font-size: 15px; }
.placeholder { margin: 0; color: var(--text-sub); }
.answer { white-space: pre-wrap; margin: 0; line-height: 1.85; }
.loading { margin: 0; color: var(--primary); font-weight: 700; }

/* Info / message */
.info-box {
  margin: -8px 0 28px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--surface-sub);
  border: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-sub);
}
.info-box strong { display: block; color: var(--text); margin-bottom: 2px; }

.message {
  margin: 0;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 15px;
  line-height: 1.7;
}
.panel-generate .message { margin-top: 20px; }
.message-info  { background: var(--accent-soft); color: #075e54; border: 1px solid #b7e2dc; }
.message-error { background: var(--danger-soft); color: var(--danger); border: 1px solid #fecdca; }

/* Preview cards */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
  padding: 18px;
}
.preview-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  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 12px 8px;
  font-size: 13px;
}
.preview-card-head strong { font-family: "Inter", sans-serif; color: var(--accent); }
.preview-card-head span { color: var(--text-sub); font-size: 12px; }
.preview-image {
  aspect-ratio: 3 / 4;
  margin: 0 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-sub);
  display: grid;
  gap: 5px;
  padding: 7px;
}
.preview-image .koma {
  border: 1.5px solid #d3d8e2;
  border-radius: 4px;
  background: #fff;
}
.preview-caption {
  padding: 10px 12px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-sub);
}
.preview-caption b {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin-bottom: 2px;
  color: var(--text);
  font-size: 13px;
}
.coming-soon {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-sub);
  background: var(--surface-sub);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 8px;
}

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.7;
  padding-bottom: 40px;
}
.app-footer .container {
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* 動きを減らす設定の利用者にはアニメーションを控える */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation-duration: 1.6s !important;
  }
  .btn:hover, .preview-card:hover { transform: none; }
}

/* ---------- Tablet ---------- */
@media (max-width: 1024px) {
  .container { padding: 0 24px; }
  .main-grid {
    grid-template-columns: 1fr;
    max-width: 760px;
    gap: 28px;
  }
  /* 出力枚数（1/2/4/8枚）が端数なく並ぶ4列 */
  .preview-grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
  .preview-caption b { font-size: 12px; white-space: nowrap; }
}

/* ---------- Smartphone ---------- */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .header-inner { height: 60px; }
  .logo-mark { width: 34px; height: 34px; padding: 7px; }
  .logo h1 { font-size: 17px; }
  .steps { display: none; }

  .main-grid { padding-top: 20px; padding-bottom: 32px; gap: 20px; }
  .panel { padding: 22px 18px; border-radius: 18px; }
  .panel-icon { width: 44px; height: 44px; padding: 11px; border-radius: 12px; }
  .panel-head h2 { font-size: 19px; }
  .panel-desc { margin: 14px 0 22px; }
  .field-row { grid-template-columns: 1fr; gap: 22px; }
  .result-body { padding: 16px; }

  /* プレビューは縦1列。サムネイル＋説明の横長カードにして縦に長くなりすぎないようにする */
  .preview-grid { grid-template-columns: 1fr; gap: 12px; padding: 14px; }
  .preview-card {
    display: grid;
    grid-template-columns: 96px 1fr;
    grid-template-rows: auto 1fr;
    align-items: start;
  }
  .preview-image { grid-row: 1 / 3; grid-column: 1; margin: 12px 0 12px 12px; }
  .preview-card-head { grid-column: 2; padding: 12px 14px 0; }
  .preview-caption { grid-column: 2; padding: 4px 14px 12px; }
}