/* 閱讀首頁（/read）
 *
 * 給 7–12 歲的。版面只回答一個問題：「我現在要讀什麼？」
 * 由上而下只有三層決定：替你挑好的一篇 → 今天的新聞 → 你讀到哪了。
 *
 * 顏色沿用 world.css 的 --zg-* 變數，不另外開一套；
 * 分類色塊也直接用 --zg-c-<color> / --zg-c-<color>-i（WorldNewsService::catColor）。
 */

.rb-wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ── 日期列 ───────────────────────────────── */
.rb-date { background: #fff; border-bottom: 1px solid #efe6d6; }
.rb-date-in { display: flex; align-items: center; gap: 12px; min-height: 56px;
  font-size: 14px; color: var(--zg-muted); flex-wrap: wrap; padding: 8px 20px; }
.rb-date .pub { font-weight: 900; color: var(--zg-ink); }
.rb-date .sep { opacity: .35; }
.rb-ctrl { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.rb-seg { display: flex; background: #f3ece0; border-radius: 999px; padding: 3px; }
.rb-seg button { border: 0; background: none; font: 700 14px/1 var(--zg-sans);
  color: var(--zg-muted); padding: 8px 14px; border-radius: 999px; cursor: pointer; }
.rb-seg button.on { background: var(--zg-brand); color: #fff; }

.rb-zy { display: inline-flex; align-items: center; gap: 8px; border: 2px solid #e3d7c2;
  background: #fff; border-radius: 999px; padding: 7px 14px;
  font: 700 14px/1 var(--zg-sans); color: var(--zg-muted); cursor: pointer; }
.rb-zy .dot { width: 26px; height: 15px; border-radius: 999px; background: #ddd2bd;
  position: relative; transition: background .15s; }
.rb-zy .dot::after { content: ''; position: absolute; top: 2px; left: 2px;
  width: 11px; height: 11px; border-radius: 50%; background: #fff; transition: transform .15s; }
.rb-zy.on { color: var(--zg-ink); border-color: var(--zg-brand); }
.rb-zy.on .dot { background: var(--zg-brand); }
.rb-zy.on .dot::after { transform: translateX(11px); }

/* ── 區塊 ─────────────────────────────────── */
/* app.css 有一條全站的 section{padding:4rem 0}，會在每個區塊上下各加 64px。
   這裡用自己的間距，所以要歸零 —— 動那條全站規則會波及所有頁面。 */
.rb-sec { margin: 34px 0 40px; padding: 0; }
.rb-h { font: 900 24px/1.3 var(--zg-sans); color: var(--zg-ink); margin: 0;
  display: flex; align-items: center; gap: 9px; }
.rb-ic { font-size: 22px; }
.rb-sub { color: var(--zg-muted); margin: 8px 0 0; font-size: 15px; line-height: 1.7; }
.rb-hrow { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.rb-more { color: var(--zg-brand-ink); font-weight: 800; text-decoration: none;
  font-size: 15px; white-space: nowrap; }
.rb-more:hover { text-decoration: underline; }

/* ── 共用的卡片外觀 ───────────────────────── */
.rb-pick, .rb-card { display: block; background: var(--zg-card); border: 1px solid #efe6d6;
  border-radius: 18px; overflow: hidden; text-decoration: none; color: inherit;
  transition: transform .12s, box-shadow .12s; }
.rb-pick:hover, .rb-card:hover { transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(58, 48, 32, .09); }
.rb-pick .meta, .rb-card .meta { display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--zg-muted); flex-wrap: wrap; }
.rb-pick .cat, .rb-card .cat { border-radius: 999px; padding: 4px 11px; font-weight: 800; }
.rb-pick .seen, .rb-card .seen { margin-left: auto; font-style: normal; font-weight: 800;
  color: var(--zg-brand-ink); }

/* ── ① 今天先讀這篇 ───────────────────────── */
.rb-pick { margin-top: 18px; display: grid; grid-template-columns: 420px 1fr; align-items: stretch; }
.rb-pick .fig { background: #fbf6ec; overflow: hidden; }
.rb-pick .fig img { width: 100%; height: 100%; object-fit: cover; display: block; }
.rb-pick .art { padding: 24px 26px 26px; align-self: center; }
.rb-pick h2 { font: 900 26px/1.5 var(--zg-sans); color: var(--zg-ink); margin: 14px 0 10px; }
.rb-pick p { color: var(--zg-muted); line-height: 1.85; margin: 0; font-size: 17px; }
.rb-pick .go { display: inline-block; margin-top: 18px; font-weight: 800;
  color: var(--zg-brand-ink); }

/* ── ② 今天的世界 ─────────────────────────── */
.rb-news { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
.rb-card .art { padding: 18px 20px 20px; }
.rb-card h3 { font: 800 18px/1.6 var(--zg-sans); color: var(--zg-ink); margin: 11px 0 8px; }
.rb-card p { color: var(--zg-muted); line-height: 1.8; margin: 0; font-size: 16px; }

/* 讀過的淡一點，但不要淡到看不清楚 —— 它還是要能再讀一次 */
.rb-pick.is-read, .rb-card.is-read { opacity: .74; }

/* ── ③ 讀到哪了 ───────────────────────────── */
.rb-done { background: #fff; border: 1px solid #efe6d6; border-radius: 18px; padding: 24px 26px 26px; }
.rb-bar { margin-top: 16px; max-width: 540px; }
.rb-bar b { font: 900 15px/1 var(--zg-sans); color: var(--zg-ink); }
.rb-bar .n { float: right; color: var(--zg-muted); font-weight: 800; font-size: 14px; }
.rb-bar .track { height: 14px; border-radius: 999px; background: #f0ece2;
  margin-top: 10px; overflow: hidden; }
.rb-bar .fill { height: 100%; border-radius: 999px; background: var(--zg-brand);
  width: 0; transition: width .5s; }
.rb-bar .hint { color: var(--zg-muted); font-size: 13.5px; margin-top: 9px; }

/* ── 年段字級：低年級要大、行距要寬 ───────────── */
body[data-grade="low"]  .rb-pick p,
body[data-grade="low"]  .rb-card p { font-size: 18px; line-height: 2; }
body[data-grade="low"]  .rb-pick h2 { font-size: 28px; }
body[data-grade="low"]  .rb-card h3 { font-size: 20px; line-height: 1.75; }
body[data-grade="high"] .rb-pick p,
body[data-grade="high"] .rb-card p { font-size: 15px; line-height: 1.75; }
body[data-grade="high"] .rb-pick h2 { font-size: 23px; }

/* 關掉注音：把拼音藏起來，字就回到一般行距 */
body.no-zy rt { display: none; }

@media (max-width: 900px) {
  .rb-news { grid-template-columns: 1fr 1fr; }
  .rb-pick { grid-template-columns: 1fr; }
  .rb-pick .fig { max-height: 220px; }
}
@media (max-width: 680px) {
  .rb-news { grid-template-columns: 1fr; }
  .rb-h { font-size: 21px; }
  .rb-pick h2 { font-size: 22px; }
  .rb-ctrl { margin-left: 0; width: 100%; }
  .rb-seg button { padding: 8px 11px; }
}

/* ── 原理圖鑑 ─────────────────────────────── */
.rb-how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
/* 五篇排三欄會剩兩個，讓後兩個各佔一半，不要留一個空洞 */
.rb-how .rb-hcard:nth-child(4), .rb-how .rb-hcard:nth-child(5) { grid-column: span 3 / span 3; }
@supports (grid-template-columns: subgrid) {
  .rb-how { grid-template-columns: repeat(6, 1fr); }
  .rb-how .rb-hcard { grid-column: span 2; }
  .rb-how .rb-hcard:nth-child(4), .rb-how .rb-hcard:nth-child(5) { grid-column: span 3; }
}
@media (max-width: 900px) {
  .rb-how, .rb-how .rb-hcard,
  .rb-how .rb-hcard:nth-child(4), .rb-how .rb-hcard:nth-child(5) { grid-column: auto; }
  .rb-how { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .rb-how { grid-template-columns: 1fr; }
}