:root {
  --bg: #13141c;
  --bg-panel: #1c1e2a;
  --bg-input: #262939;
  --border: #363a4f;
  --text: #e6e8f0;
  --text-dim: #9aa0b5;
  --accent: #7c5cff;
  --accent-hover: #9179ff;
  --danger: #e5484d;
  --warning: #f5a623;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent-hover); }

.app-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header h1 { font-size: 1.2rem; margin: 0; }

.tabs { display: flex; gap: 0.25rem; }

.tab-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: var(--radius);
}
.tab-btn:hover { color: var(--text); background: var(--bg-input); }
.tab-btn.active { color: var(--text); background: var(--accent); }

main { padding: 1.5rem; max-width: 1200px; margin: 0 auto; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- form ---- */
.field { margin-bottom: 1rem; flex: 1; }
.field label { display: block; font-size: 0.85rem; color: var(--text-dim); margin-bottom: 0.3rem; }
.field-row { display: flex; gap: 1rem; }

input[type="text"], input[type="password"], input[type="number"], textarea, select {
  width: 100%;
  padding: 0.5rem 0.7rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
}
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); }

.checkbox-field label { display: flex; align-items: center; gap: 0.5rem; color: var(--text); cursor: pointer; }
.checkbox-field input { width: auto; }

.hint { font-size: 0.8rem; color: var(--text-dim); margin: 0.3rem 0 0; }
.hint.warning { color: var(--warning); }

button { font-family: inherit; cursor: pointer; }

.primary-btn, .secondary-btn, .danger-btn {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 0.95rem;
}
.primary-btn { background: var(--accent); color: #fff; }
.primary-btn:hover { background: var(--accent-hover); }
.primary-btn:disabled { background: var(--border); cursor: not-allowed; }
.secondary-btn { background: var(--bg-input); color: var(--text); border-color: var(--border); }
.secondary-btn:hover { border-color: var(--accent); }
.danger-btn { background: transparent; color: var(--danger); border-color: var(--danger); }
.danger-btn:hover { background: var(--danger); color: #fff; }
.icon-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  color: var(--text);
}

.btn-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.5rem; }
.input-row { display: flex; gap: 0.5rem; }
.hidden { display: none !important; }

kbd {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 0.35em;
  font-size: 0.85em;
  font-family: inherit;
}

/* ---- 案内バナー ---- */
.notice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: rgba(124, 92, 255, 0.12);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.8rem 1.2rem;
  margin-bottom: 1.2rem;
}

/* ---- 生成中スピナー ---- */
.spinner {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin-right: 0.5em;
  vertical-align: -0.1em;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- generate ---- */
.generate-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
@media (max-width: 900px) { .generate-layout { grid-template-columns: 1fr; } }

/* デスクトップではフォームをスクロールしてもプレビューが見え続けるようにする */
@media (min-width: 901px) {
  .generate-preview { position: sticky; top: 4.5rem; align-self: start; }
}

.generate-btn-row { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }
.generate-btn-row .hint { margin: 0; }

.auto-generate {
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.auto-generate legend { padding: 0 0.5rem; color: var(--text-dim); font-size: 0.9rem; }
.auto-status { font-size: 0.9rem; color: var(--accent-hover); min-height: 1.4em; margin: 0.5rem 0 0; }

.generation-status { min-height: 1.6em; font-size: 0.9rem; color: var(--text-dim); margin-bottom: 0.5rem; }
.generation-status.error { color: var(--danger); }

.latest-image {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.latest-image img { max-width: 100%; max-height: 75vh; display: block; cursor: zoom-in; }
.latest-image .placeholder { color: var(--text-dim); }

.character-select {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 2.5rem;
}
.character-select .empty { color: var(--text-dim); font-size: 0.85rem; }
.char-chip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.8rem;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}
.char-chip input { width: auto; margin: 0; }
.char-chip:has(input:checked) { border-color: var(--accent); background: rgba(124, 92, 255, 0.15); }

/* ---- characters ---- */
.characters-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
@media (max-width: 900px) { .characters-layout { grid-template-columns: 1fr; } }

.character-form, .character-list-wrap {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.character-form h2, .character-list-wrap h2 { margin-top: 0; font-size: 1.05rem; }

.character-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  margin-bottom: 0.8rem;
}
.character-card h3 { margin: 0 0 0.3rem; font-size: 1rem; }
.character-card .char-prompt-text {
  font-size: 0.85rem;
  color: var(--text-dim);
  white-space: pre-wrap;
  word-break: break-all;
  margin: 0 0 0.5rem;
}
.character-card .btn-row button { padding: 0.3rem 0.8rem; font-size: 0.85rem; }

/* ---- optimize ---- */
.optimize-layout { display: flex; flex-direction: column; gap: 1.5rem; }

.opt-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.opt-panel h2 { margin-top: 0; font-size: 1.05rem; }

.opt-candidates {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 0.8rem;
}
.opt-candidate {
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-input);
  transition: border-color 0.15s, transform 0.1s;
}
.opt-candidate:hover { border-color: var(--accent); transform: translateY(-2px); }
.opt-candidate img { width: 100%; display: block; }
.opt-candidate .opt-label {
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.opt-candidate .opt-prompt {
  padding: 0 0.6rem 0.5rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  word-break: break-all;
}

.checkbox-inline {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  cursor: pointer;
}

.opt-subheading {
  font-size: 0.95rem;
  margin: 1.5rem 0 0.3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.opt-experiment-list { margin-top: 0.8rem; }
.opt-experiment {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  margin-bottom: 0.6rem;
}
.opt-experiment-title { font-size: 0.95rem; }
.opt-experiment .btn-row button { padding: 0.3rem 0.8rem; font-size: 0.85rem; }

.opt-ranking-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.opt-ranking-table th, .opt-ranking-table td {
  text-align: left;
  padding: 0.35rem 0.6rem;
  border-bottom: 1px solid var(--border);
}
.opt-ranking-table th { color: var(--text-dim); font-weight: normal; }
.opt-ranking-table tr.positive td:nth-child(2) { color: #4caf7d; }
.opt-ranking-table tr.negative td:nth-child(2) { color: var(--danger); }

/* ---- gallery ---- */
.gallery-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
#gallery-count { color: var(--text-dim); font-size: 0.9rem; }

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.8rem;
}
.gallery-item {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-panel);
  aspect-ratio: 832 / 1216;
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.gallery-item:hover { border-color: var(--accent); }
.gallery-item .item-date {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  font-size: 0.7rem;
  padding: 0.2rem 0.4rem;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
}
.gallery-empty { color: var(--text-dim); }

/* ---- settings ---- */
.settings-form { max-width: 640px; }
.settings-form h2 { font-size: 1.05rem; margin-top: 2rem; }
.settings-form h2:first-child { margin-top: 0; }
.api-key-row { display: flex; gap: 0.5rem; }
.settings-status { min-height: 1.4em; font-size: 0.9rem; }
.settings-status.ok { color: #4caf7d; }
.settings-status.error { color: var(--danger); }

/* ---- modal ---- */
.modal { position: fixed; inset: 0; z-index: 100; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.7); }
.modal-content {
  position: relative;
  max-width: 1000px;
  margin: 4vh auto;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-height: 92vh;
  overflow: auto;
}
.modal-close {
  position: absolute;
  top: 0.5rem;
  right: 0.7rem;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.6rem;
  z-index: 1;
}
.modal-body { display: grid; grid-template-columns: 3fr 2fr; gap: 1rem; padding: 1.5rem; }
@media (max-width: 800px) { .modal-body { grid-template-columns: 1fr; } }
.modal-body img { max-width: 100%; border-radius: var(--radius); }
.modal-meta dl { font-size: 0.85rem; margin: 0; }
.modal-meta dt { color: var(--text-dim); margin-top: 0.6rem; }
.modal-meta dd { margin: 0; word-break: break-all; white-space: pre-wrap; }

/* ---- モバイル ---- */
@media (max-width: 600px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
  }
  .tabs { flex-wrap: wrap; }
  .tab-btn { padding: 0.4rem 0.7rem; font-size: 0.9rem; }
  main { padding: 1rem; }
  .field-row { flex-direction: column; gap: 0; }
}