:root {
  --bg: #F7F6F3;
  --card: #FFFFFF;
  --ink: #15141F;
  --sub: #6B6A75;
  --line: #E7E5E0;
  --soft: #EFEDE8;
  --accent: #FF5A4E;
  --accent-ink: #FFFFFF;
  --rise: #FF7A1A;
  --blue: #3D8BFF;
  --ok: #1FA870;
  --ng: #D9483B;
  --shadow: 0 1px 2px rgba(21, 20, 31, .05), 0 4px 16px rgba(21, 20, 31, .04);
  --radius: 16px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F0E15;
    --card: #1B1A24;
    --ink: #F2F1F6;
    --sub: #9D9CA8;
    --line: #2B2A36;
    --soft: #24232E;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  max-width: 680px;
  margin-inline: auto;
  padding-bottom: env(safe-area-inset-bottom);
}
button { font: inherit; color: inherit; cursor: pointer; }
a { color: inherit; }

/* ヘッダー */
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { border-radius: 8px; }
.brand h1 { margin: 0; font-size: 19px; line-height: 1.1; letter-spacing: .04em; }
.brand p { margin: 1px 0 0; font-size: 11px; color: var(--sub); letter-spacing: .02em; }
.icon-btn { background: none; border: 0; padding: 8px; border-radius: 10px; color: var(--sub); }
.icon-btn:hover { background: var(--soft); }

/* おすすめ / 急上昇 / 新着 */
.modes {
  display: grid; grid-template-columns: repeat(3, 1fr);
  margin: 4px 16px 10px; padding: 3px;
  background: var(--soft); border-radius: 12px;
}
.modes button {
  border: 0; background: none; padding: 7px 0; border-radius: 9px;
  font-size: 14px; font-weight: 600; color: var(--sub);
}
.modes button.on { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

/* トピックのチップ */
.chips {
  display: flex; gap: 8px; overflow-x: auto; padding: 0 16px 12px;
  scrollbar-width: none;
}
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none; border: 1px solid var(--line); background: var(--card);
  padding: 6px 12px; border-radius: 999px; font-size: 14px; white-space: nowrap;
}
.chip.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* ニュースカード */
main { padding: 0 16px; display: grid; gap: 10px; }
.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  border: 1px solid var(--line);
  overflow: hidden;
}
.card.read { opacity: .62; }
.card-main {
  display: grid; grid-template-columns: 28px 1fr 88px; gap: 4px 10px;
  width: 100%; text-align: left; background: none; border: 0; padding: 14px 14px 12px;
}
.rank { font-size: 15px; font-weight: 800; color: var(--sub); font-variant-numeric: tabular-nums; padding-top: 1px; }
.rank.hot { color: var(--accent); }
.tags { grid-column: 2; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 12px; color: var(--sub); }
.tag { background: var(--soft); padding: 1px 8px; border-radius: 999px; color: var(--ink); }
.badge { font-size: 11px; font-weight: 700; padding: 1px 7px; border-radius: 999px; }
.badge.rise { background: color-mix(in srgb, var(--rise) 15%, transparent); color: var(--rise); }
.badge.follow { background: color-mix(in srgb, var(--blue) 15%, transparent); color: var(--blue); }
.badge.kw { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
.badge.age { background: color-mix(in srgb, var(--ok) 15%, transparent); color: var(--ok); }
.thumb {
  grid-column: 3; grid-row: 1 / span 3; align-self: start;
  width: 88px; height: 88px; border-radius: 12px; overflow: hidden; position: relative;
  background: var(--soft);
}
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; position: relative; z-index: 1; }
.thumb i {
  position: absolute; inset: 0; display: grid; place-items: center; font-style: normal; font-size: 30px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 22%, var(--soft)), color-mix(in srgb, var(--blue) 18%, var(--soft)));
}
.thumb:not(.none) i { visibility: hidden; }
.credit { margin: -4px 14px 6px 52px; font-size: 11px; color: var(--sub); display: none; }
.card.open .credit { display: block; }
.card.noimg .credit { display: none; }
.title { grid-column: 2; margin: 2px 0 0; font-size: 16.5px; font-weight: 700; line-height: 1.45; }
.meta { grid-column: 2; display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--sub); margin-top: 4px; }
.stack { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; color: var(--ink); }
.stack .bars { display: inline-flex; gap: 2px; }
.stack .bars i { width: 4px; height: 12px; border-radius: 2px; background: var(--line); }
.stack .bars i.f { background: var(--accent); }

.articles { list-style: none; margin: 0; padding: 0 14px 12px 52px; display: none; }
.card.open .articles { display: block; }
.articles li { border-top: 1px solid var(--line); }
.articles a { display: block; padding: 9px 0; text-decoration: none; }
.articles .src { font-size: 12px; color: var(--sub); display: flex; justify-content: space-between; gap: 8px; }
.articles .src b { color: var(--ink); font-weight: 700; }
.articles .t { font-size: 14px; line-height: 1.45; }
.articles a:hover .t { text-decoration: underline; }
.card-actions { display: flex; gap: 8px; padding: 0 14px 12px 52px; display: none; }
.card.open .card-actions { display: flex; }
.small-btn { white-space: nowrap; flex: none; border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 4px 12px; font-size: 12.5px; color: var(--sub); }

.empty, .loading { text-align: center; color: var(--sub); padding: 48px 16px; font-size: 14px; }
.skeleton { height: 96px; border-radius: var(--radius); background: linear-gradient(90deg, var(--soft), var(--card), var(--soft)); background-size: 200% 100%; animation: sh 1.2s infinite linear; }
@keyframes sh { to { background-position: -200% 0; } }

footer { padding: 20px 16px 36px; font-size: 12px; color: var(--sub); text-align: center; line-height: 1.7; }
footer button { background: none; border: 0; color: var(--sub); text-decoration: underline; padding: 0; font-size: 12px; }

/* 下から出てくるシート */
.sheet-bg {
  position: fixed; inset: 0; z-index: 20;
  background: rgba(10, 10, 15, .45);
  display: flex; align-items: flex-end; justify-content: center;
}
.sheet-bg[hidden] { display: none; }
.sheet {
  width: 100%; max-width: 680px; max-height: 92vh; overflow-y: auto;
  background: var(--bg); border-radius: 22px 22px 0 0;
  padding: 18px 18px calc(24px + env(safe-area-inset-bottom));
  animation: up .25s ease-out;
}
@keyframes up { from { transform: translateY(30px); opacity: .5; } }
.sheet-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.sheet h2 { margin: 0; font-size: 20px; }
.sheet h3 { font-size: 13px; color: var(--sub); font-weight: 700; margin: 22px 0 8px; letter-spacing: .03em; }
.text-btn { background: none; border: 0; color: var(--accent); font-weight: 700; padding: 6px; }

.onboard { min-height: 70vh; display: flex; flex-direction: column; }
.onboard h2 { font-size: 22px; margin: 8px 0 4px; }
.onboard .lead { color: var(--sub); margin: 0 0 16px; font-size: 14px; }
.steps { display: flex; gap: 6px; }
.steps i { flex: 1; height: 4px; border-radius: 2px; background: var(--line); }
.steps i.on { background: var(--accent); }
.choices { display: grid; gap: 8px; }
.choice {
  display: flex; align-items: center; gap: 12px;
  border: 1.5px solid var(--line); background: var(--card); border-radius: 14px;
  padding: 13px 14px; text-align: left; font-size: 16px;
}
.choice .em { font-size: 22px; width: 28px; text-align: center; }
.choice small { display: block; color: var(--sub); font-size: 12px; }
.choice.on { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.grid2 { grid-template-columns: 1fr 1fr; }
.choice .rec { display: block; font-size: 11px; font-weight: 700; color: var(--accent); }
.ob-foot { margin-top: auto; padding-top: 20px; display: flex; gap: 10px; }
.primary {
  flex: 1; border: 0; background: var(--ink); color: var(--bg);
  border-radius: 14px; padding: 14px; font-weight: 700; font-size: 16px;
}
.primary:disabled { opacity: .35; }
.ghost { border: 1px solid var(--line); background: var(--card); border-radius: 14px; padding: 14px 18px; }
.note { font-size: 12px; color: var(--sub); margin-top: 10px; }

/* 設定のトピック行 */
.trow { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px; margin-bottom: 8px; }
.trow-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.trow-name { font-weight: 700; }
.seg { display: inline-flex; background: var(--soft); border-radius: 10px; padding: 2px; }
.seg button { border: 0; background: none; padding: 4px 10px; border-radius: 8px; font-size: 12.5px; color: var(--sub); }
.seg button.on { background: var(--card); color: var(--ink); font-weight: 700; box-shadow: var(--shadow); }
.seg button.on[data-w="2"] { background: var(--accent); color: var(--accent-ink); }
.srcs { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 8px; font-size: 12px; color: var(--sub); }
.srcs span::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 5px; background: var(--line); vertical-align: 1px; }
.srcs span.ok::before { background: var(--ok); }
.srcs span.ng::before { background: var(--ng); }

.kw-box { display: flex; gap: 8px; }
.kw-box input {
  flex: 1; min-width: 0; font: inherit; font-size: 16px; padding: 10px 12px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
}
.kw-box button { border: 0; background: var(--ink); color: var(--bg); border-radius: 12px; padding: 0 16px; font-weight: 700; }
.kw-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.kw-list button { border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 4px 10px; font-size: 13px; }
.kw-list button::after { content: " ×"; color: var(--sub); }
.help { font-size: 12.5px; color: var(--sub); line-height: 1.7; }