/* Styles for the static SEO pages (public/learn/, public/sc/learn/). Copied to public/learn/seo.css by build_seo.js. */
:root { --bg: #fffdf5; --card: #fff; --ink: #1b1b1f; --muted: #6b6b76; --line: #ece8dc; --brand: #ffd400; --ok: #22a447; --no: #e0322f; --soft: #fff6c7; }
@media (prefers-color-scheme: dark) { :root { --bg: #121216; --card: #1d1d23; --ink: #f2f2f5; --muted: #a0a0ad; --line: #2c2c35; --soft: #2b2710; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.65 -apple-system, "Segoe UI", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif; }
a { color: inherit; }
.sh { position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 10px 16px; background: var(--bg); border-bottom: 1px solid var(--line); }
.logo { text-decoration: none; font-weight: 700; white-space: nowrap; }
.logo b { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--brand); color: #1b1b1f; }
.logo small { color: var(--muted); font-weight: 400; }
.sh-r { display: flex; gap: 12px; align-items: center; font-size: 15px; }
.go, .btn { background: var(--brand); color: #1b1b1f; text-decoration: none; font-weight: 700; border-radius: 999px; padding: 8px 16px; white-space: nowrap; }
.wrap { max-width: 860px; margin: 0 auto; padding: 8px 16px 40px; }
.crumbs { font-size: 13px; color: var(--muted); margin: 8px 0; }
h1 { font-size: 28px; line-height: 1.3; margin: 8px 0; }
h2 { font-size: 21px; margin: 32px 0 8px; }
.en { display: block; font-size: .62em; color: var(--muted); font-weight: 600; }
h2 .en { display: inline; margin-left: 6px; }
.lead { color: var(--muted); }
.muted { color: var(--muted); }
.cta { margin: 20px 0; padding: 16px; background: var(--soft); border-radius: 16px; text-align: center; }
.cta .btn { display: inline-block; font-size: 18px; padding: 12px 22px; }
.cta small { display: block; margin-top: 6px; color: var(--muted); }
.lines, .quiz, .how { padding-left: 1.6em; }
.lines li, .quiz li { margin: 0 0 14px; padding: 10px 12px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.ask { font-size: 14px; color: var(--muted); }
.dont { color: var(--no); text-decoration: line-through; text-decoration-thickness: 1px; }
.say { font-weight: 700; }
.dont + .say { color: var(--ok); }
.zh { color: var(--muted); }
.opts { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.opts span { border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px; font-size: 15px; }
.vt { width: 100%; border-collapse: collapse; font-size: 15px; }
.vt th, .vt td { border-bottom: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
.vt th { background: var(--soft); }
.ladder td small { display: block; color: var(--muted); }
@media (max-width: 640px) { .vt { display: block; overflow-x: auto; } }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin: 16px 0; }
.card, .row { display: block; text-decoration: none; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 10px; }
.card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; border-radius: 10px; }
.card b, .row b { display: block; margin-top: 4px; }
.card small, .row small { color: var(--muted); font-size: 13px; }
.row { margin: 10px 0; padding: 14px 16px; }
.imgs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.imgs img, .yt img { width: 100%; border-radius: 12px; display: block; }
.yt { display: block; position: relative; max-width: 480px; margin: 12px auto; text-decoration: none; }
.yt span { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); background: #e0322f; color: #fff; padding: 8px 14px; border-radius: 10px; font-weight: 700; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; margin: 8px 0; }
summary { font-weight: 700; cursor: pointer; }
.tip { border-left: 4px solid var(--brand); padding: 4px 12px; background: var(--card); }
.sf { border-top: 1px solid var(--line); padding: 16px; text-align: center; font-size: 14px; color: var(--muted); }
.sf a { margin: 0 2px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips a { border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 3px 12px; font-size: 15px; text-decoration: none; }
.chips small { color: var(--muted); }
.ladder td.hl { background: var(--soft); }
.say-btn { border: 0; background: none; cursor: pointer; font-size: 1em; padding: 0 4px; }
.tool { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px; margin: 16px 0; }
.tool textarea, .tool select { width: 100%; font: inherit; padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); margin-bottom: 10px; }
.tool button, .tool .btn { border: 0; cursor: pointer; font: inherit; font-weight: 700; background: var(--brand); color: #1b1b1f; border-radius: 999px; padding: 10px 18px; }
.opts.big button { background: var(--soft); color: var(--ink); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; font-size: 17px; }
.big { font-size: 24px; }
.w-ok { color: var(--ok); font-weight: 700; }
.w-no { color: var(--no); font-weight: 700; text-decoration: underline wavy; }