:root {
  --bg: #f4f6f5;
  --card-bg: #ffffff;
  --primary: #2f5d50;
  --primary-dark: #234439;
  --accent: #c9803a;
  --text: #22302c;
  --muted: #6b7a75;
  --border: #e1e6e3;
  --danger: #b3462c;
}

* {
  box-sizing: border-box;
}

button {
  touch-action: manipulation;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: contain;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 0 calc(40px + env(safe-area-inset-bottom));
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  padding-top: calc(16px + env(safe-area-inset-top));
  padding-left: calc(16px + env(safe-area-inset-left));
  padding-right: calc(16px + env(safe-area-inset-right));
  background: var(--primary);
  color: white;
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar h1 {
  font-size: 1.1rem;
  margin: 0;
}

.today-badge {
  font-size: 0.85rem;
}

.page-note {
  margin: 12px 16px;
  margin-left: calc(16px + env(safe-area-inset-left));
  margin-right: calc(16px + env(safe-area-inset-right));
  font-size: 0.8rem;
  color: var(--muted);
}

.demo-banner {
  margin: 12px 16px 0;
  margin-left: calc(16px + env(safe-area-inset-left));
  margin-right: calc(16px + env(safe-area-inset-right));
  padding: 10px 12px;
  background: #fdf6ec;
  border: 1px solid #eddcb8;
  border-radius: 8px;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

/* ===== カテゴリ一覧画面 ===== */
.category-menu {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0 16px 16px;
  margin-left: calc(16px + env(safe-area-inset-left));
  margin-right: calc(16px + env(safe-area-inset-right));
}

.category-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 0;
  padding: 20px 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card-bg);
  cursor: pointer;
}

.category-btn:active {
  background: #f0f2f1;
}

.category-btn-emoji {
  font-size: 1.8rem;
}

.category-btn-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-dark);
  text-align: center;
  overflow-wrap: anywhere;
}

/* ===== 詳細画面の「戻る」バー ===== */
.detail-header {
  position: sticky;
  top: calc(56px + env(safe-area-inset-top));
  z-index: 8;
  background: var(--bg);
  padding: 10px 16px;
  padding-left: calc(16px + env(safe-area-inset-left));
  padding-right: calc(16px + env(safe-area-inset-right));
}

.btn-back {
  padding: 8px 14px;
  border: 1px solid var(--primary);
  border-radius: 999px;
  background: white;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-back:active {
  background: var(--primary);
  color: white;
}

/* mode-menu/mode-detailで一覧画面と詳細画面を切り替える(スマホ幅) */
.mode-detail .category-menu {
  display: none;
}

#news-sections {
  display: none;
}

.mode-detail #news-sections {
  display: block;
}

#news-sections .card {
  display: none;
}

#news-sections .card.active {
  display: block;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin: 0 16px 16px;
  margin-left: calc(16px + env(safe-area-inset-left));
  margin-right: calc(16px + env(safe-area-inset-right));
}

.card h2 {
  font-size: 1rem;
  margin: 0 0 10px;
  color: var(--primary-dark);
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.news-item {
  background: #fafbfa;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.news-header {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  width: 100%;
  border: none;
  background: none;
  padding: 0;
  margin: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  position: relative;
}

.news-title {
  display: block;
  color: var(--primary-dark);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.4;
  padding-right: 24px;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.news-chevron {
  position: absolute;
  top: 2px;
  right: 0;
  font-size: 0.7rem;
  color: var(--muted);
  transition: transform 0.15s ease;
}

.news-item.expanded .news-chevron {
  transform: rotate(180deg);
}

.news-body {
  display: none;
}

.news-item.expanded .news-body {
  display: block;
}

.source-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--primary);
  color: white;
  font-size: 0.68rem;
  font-weight: 600;
  white-space: nowrap;
}

.news-date {
  font-size: 0.72rem;
  color: var(--muted);
}

.news-desc {
  font-size: 0.8rem;
  color: var(--text);
  margin-top: 8px;
  line-height: 1.5;
}

.ai-comment-box {
  margin-top: 10px;
  padding: 10px 12px;
  background: #fdf6ec;
  border: 1px solid #eddcb8;
  border-radius: 8px;
}

.ai-comment-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.ai-comment-text {
  font-size: 0.8rem;
  color: var(--text);
  line-height: 1.6;
  white-space: pre-wrap;
}

.news-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 10px;
}

.btn-read-more {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: white;
  color: var(--text);
  font-size: 0.75rem;
  text-decoration: none;
  cursor: pointer;
}

.btn-ask-ai {
  padding: 6px 12px;
  border: 1px solid var(--primary);
  border-radius: 999px;
  background: white;
  color: var(--primary);
  font-size: 0.75rem;
  cursor: pointer;
}

.btn-ask-ai:active {
  background: var(--primary);
  color: white;
}

.fetched-at {
  font-size: 0.75rem;
  color: var(--muted);
  margin: -4px 0 10px;
}

.empty-text {
  font-size: 0.85rem;
  color: var(--muted);
}

.error-text {
  color: var(--danger);
  font-size: 0.85rem;
}

.hint-toast {
  position: fixed;
  left: calc(16px + env(safe-area-inset-left));
  right: calc(16px + env(safe-area-inset-right));
  bottom: calc(16px + env(safe-area-inset-bottom));
  max-width: 448px;
  margin: 0 auto;
  background: var(--primary-dark);
  color: white;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.85rem;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 20;
}

/* ===== パソコン(横幅の広い画面)向けレイアウト ===== */
@media (min-width: 700px) {
  #app {
    max-width: 1100px;
  }

  .topbar {
    padding: 20px 32px;
  }

  .topbar h1 {
    font-size: 1.4rem;
  }

  .page-note {
    margin: 16px 32px;
    font-size: 0.9rem;
  }

  /* PCではカテゴリ一覧画面を使わず、従来通り全カテゴリを並べて表示する */
  .category-menu,
  .detail-header {
    display: none !important;
  }

  #news-sections {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
    padding: 0 32px;
  }

  #news-sections .card {
    display: block !important;
    margin: 0;
  }

  .hint-toast {
    max-width: 500px;
  }
}