/* AInews — mobile-first, light default + dark mode */
:root {
  --accent: #3aa5de;
  --accent-dark: #1f7fb5;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1a2129;
  --text-2: #5b6773;
  --text-3: #8b96a1;
  --line: #e3e8ed;
  --chip: #eef4f8;
  --chip-text: #2b7cab;
  --pick: #fff8ec;
  --pick-line: #f0d9a8;
  --shadow: 0 1px 3px rgba(20, 40, 60, .07);
  --r: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161a;
    --card: #1b2129;
    --text: #e8edf2;
    --text-2: #a3aeb9;
    --text-3: #6d7883;
    --line: #2a323c;
    --chip: #223442;
    --chip-text: #7cc4ea;
    --pick: #262117;
    --pick-line: #4d4128;
    --shadow: 0 1px 3px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }

/* ---------- header ---------- */
.hdr {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.hdr-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px 16px 6px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.hdr-brand h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: .12em;
  font-weight: 800;
}
.hdr-brand h1 span { color: var(--accent); }
.hdr-sub { margin: 0; font-size: 11px; color: var(--text-3); }
.hdr-meta { text-align: right; font-size: 12px; color: var(--text-2); white-space: nowrap; }
.hdr-updated { display: block; font-size: 11px; color: var(--text-3); }

/* ---------- tabs ---------- */
.tabs {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  padding: 2px 8px 0;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto;
  padding: 8px 12px 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  border: 0;
  background: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  font-family: inherit;
}
.tab .n { font-size: 11px; color: var(--text-3); margin-left: 3px; font-weight: 500; }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }

/* ---------- layout ---------- */
#main { max-width: 760px; margin: 0 auto; padding: 14px 12px 40px; }
.sec-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  margin: 4px 2px 10px;
}
.sec-badge {
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
  padding: 2px 8px;
  border-radius: 99px;
}
.sec-note { font-size: 12px; color: var(--text-3); font-weight: 500; }

.toolbar { display: flex; align-items: center; gap: 10px; margin: 18px 2px 10px; }
#search {
  flex: 1;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: var(--card);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
#search:focus { border-color: var(--accent); }
.count { font-size: 12px; color: var(--text-3); white-space: nowrap; }

/* ---------- cards ---------- */
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  padding: 12px 14px;
  margin-bottom: 10px;
}
.card-main { display: flex; gap: 12px; }
.card-body { flex: 1; min-width: 0; }
.card-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-title a:hover { color: var(--accent-dark); }
.meta { font-size: 12px; color: var(--text-3); display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: center; }
.meta .src { color: var(--text-2); font-weight: 600; }
.meta .hot { color: #e0662f; font-weight: 700; }
.thumb {
  flex: 0 0 92px;
  width: 92px;
  height: 68px;
  border-radius: 8px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--accent) 0%, #7ec8ec 100%);
  position: relative;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb.noimg::after {
  content: attr(data-initial);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, .92);
  font-size: 26px;
  font-weight: 800;
}
.chips { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 11px;
  font-weight: 600;
  color: var(--chip-text);
  background: var(--chip);
  border: 0;
  border-radius: 99px;
  padding: 3px 10px;
  cursor: pointer;
  font-family: inherit;
}
.chip:hover { filter: brightness(.96); }

/* 関連記事 */
.rel { margin-top: 8px; }
.rel summary {
  font-size: 12px;
  color: var(--accent-dark);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.rel summary::-webkit-details-marker { display: none; }
.rel summary::before { content: "▸"; transition: transform .15s; }
.rel[open] summary::before { transform: rotate(90deg); }
.rel-list { margin: 6px 0 2px; padding-left: 14px; border-left: 2px solid var(--line); }
.rel-list a {
  display: block;
  font-size: 13px;
  color: var(--text-2);
  padding: 4px 0;
  line-height: 1.4;
}
.rel-list a:hover { color: var(--accent-dark); }
.rel-list .rel-src { font-size: 11px; color: var(--text-3); margin-left: 6px; }

/* featured */
.featured .card { background: var(--pick); border-color: var(--pick-line); }
@media (prefers-color-scheme: dark) {
  .featured .card { background: var(--pick); }
}
.featured .card-title { font-size: 16px; -webkit-line-clamp: 4; }
.featured .thumb { flex-basis: 108px; width: 108px; height: 80px; }
.rank {
  flex: 0 0 22px;
  font-size: 18px;
  font-weight: 800;
  color: var(--accent);
  font-style: italic;
  padding-top: 1px;
}

.more {
  display: block;
  width: 100%;
  padding: 12px;
  margin-top: 6px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--card);
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
}
.more:hover { border-color: var(--accent); }
.empty { text-align: center; color: var(--text-3); padding: 40px 0; }

.ftr {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 16px 32px;
  font-size: 11px;
  color: var(--text-3);
  border-top: 1px solid var(--line);
}
.ftr code { background: var(--chip); padding: 1px 5px; border-radius: 4px; }

@media (min-width: 640px) {
  body { font-size: 16px; }
  .card-title { font-size: 16px; }
  .thumb { flex-basis: 148px; width: 148px; height: 92px; }
  .featured .thumb { flex-basis: 168px; width: 168px; height: 104px; }
}