/* 内容页共用样式（指法教程、关卡介绍、拼音、家长指南）：与首页同一套「键帽 + 田字格」视觉 */
:root {
  color-scheme: light;
  --paper: #f3f6fb; --grid: #e2e8f2; --card: #fff; --line: #dbe2ec; --ink: #1d2738; --sub: #5b6880;
  --cobalt: #3d5afe; --cobalt-edge: #2639c9; --cobalt-soft: #e8ecff;
  --sun: #ffc53d; --sun-edge: #dc9a00; --sun-soft: #fff4d4;
  --leaf: #1fb37a; --leaf-edge: #158a5c; --leaf-soft: #ddf7ec;
  --coral: #ff6152; --coral-soft: #ffe7e4; --grape: #8a63ff; --grape-soft: #efe9ff; --teal: #10b5c4; --teal-soft: #dcf6f8;
  --f-display: "ZCOOL KuaiLe", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --f-key: "Fredoka", "Nunito", "Arial Rounded MT Bold", "PingFang SC", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { background: var(--paper); }
body { margin: 0; color: var(--ink); font: 16px/1.8 var(--f-body); background: var(--paper); }
.wrap { max-width: 1280px; margin: 0 auto; padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }
h1, h2, h3 { font-family: var(--f-display); font-weight: 400; letter-spacing: .5px; margin: 0; text-wrap: balance; line-height: 1.3; }
a { color: var(--cobalt); }
:focus-visible { outline: 3px solid var(--cobalt); outline-offset: 3px; }
.btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font: 700 16px/1 var(--f-body); color: #fff; background: var(--cobalt);
  border-radius: 14px; padding: 15px 24px 14px; box-shadow: 0 5px 0 var(--cobalt-edge); }
.btn:active { transform: translateY(4px); box-shadow: 0 1px 0 var(--cobalt-edge); }
.btn.ghost { background: var(--card); color: var(--ink); box-shadow: 0 5px 0 var(--line); border: 2px solid var(--line); }

.nav { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; background: #f3f6fbe6; backdrop-filter: blur(8px); border-bottom: 2px solid var(--line); }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 11; background: var(--paper); }
.nav .wrap { display: flex; align-items: center; gap: 18px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); margin-right: auto; }
.logo { display: flex; gap: 4px; } .logo i { width: 30px; height: 32px; border-radius: 8px; display: grid; place-items: center; font: 700 17px var(--f-key); font-style: normal; color: #fff; background: var(--cobalt); box-shadow: 0 3px 0 var(--cobalt-edge); }
.logo i + i { background: var(--sun); color: #4a3300; box-shadow: 0 3px 0 var(--sun-edge); transform: rotate(6deg); }
.brand b { font: 400 24px var(--f-display); }
.nav nav { display: flex; gap: 18px; font-weight: 600; font-size: 15px; } .nav nav a { color: var(--sub); text-decoration: none; } .nav nav a[aria-current] { color: var(--ink); }
.nav .btn { padding: 11px 18px 10px; font-size: 15px; box-shadow: 0 4px 0 var(--cobalt-edge); }

.crumbs { font-size: 13px; color: var(--sub); margin: 22px 0 0; } .crumbs a { color: var(--sub); }
.page { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; padding: 18px 0 70px; align-items: start; }
.article { min-width: 0; }
.article h1 { font-size: clamp(32px, 4.4vw, 48px); margin: 8px 0 12px; }
.article .lead { font-size: 18px; color: var(--sub); margin: 0 0 26px; max-width: 42em; }
.article h2 { font-size: 26px; margin: 40px 0 12px; }
.article h3 { font-size: 20px; margin: 24px 0 8px; }
.article p, .article li { max-width: 46em; }
.article ul, .article ol { padding-left: 1.3em; }
.card { background: var(--card); border: 2px solid var(--line); border-radius: 20px; padding: 20px 22px; }
.aside { position: sticky; top: 92px; display: grid; gap: 14px; }
.aside .card h2 { font-size: 19px; margin: 0 0 8px; }
.aside ol { margin: 0; padding-left: 1.2em; font-size: 14px; } .aside li { margin: 2px 0; }
.aside .cta { background: linear-gradient(160deg, #fff3b0, #ffd84d); border: 0; box-shadow: 0 6px 0 var(--sun-edge); }
.aside .cta p { margin: 4px 0 14px; color: #6b4b00; font-size: 14px; }

table { width: 100%; border-collapse: collapse; background: var(--card); border: 2px solid var(--line); border-radius: 16px; overflow: hidden; font-size: 15px; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #f7f9fd; color: var(--sub); font-weight: 700; }
.table-wrap { overflow-x: auto; }
kbd, .key { display: inline-grid; place-items: center; min-width: 34px; height: 34px; padding: 0 8px; margin: 2px 3px 2px 0; border-radius: 8px; background: #fff; border: 2px solid var(--line); border-bottom-width: 4px; font: 700 16px var(--f-key); color: var(--ink); vertical-align: middle; }
.key.new { background: var(--sun-soft); border-color: #f0cf72; }
.sample { font: 600 24px/1.9 var(--f-key); letter-spacing: 3px; background: var(--card); border: 2px solid var(--line); border-radius: 16px; padding: 14px 18px; word-break: break-word; }
.sample.py { letter-spacing: 1px; font-size: 20px; }
.tips { display: grid; gap: 10px; padding: 0; list-style: none; }
.tips li { background: var(--card); border: 2px solid var(--line); border-radius: 14px; padding: 12px 16px; max-width: none; }
.tips li::before { content: "💡 "; }
.pager { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 40px; }
.pager a { flex: 1; min-width: 200px; text-decoration: none; background: var(--card); border: 2px solid var(--line); border-radius: 16px; padding: 14px 18px; color: var(--ink); }
.pager a small { display: block; color: var(--sub); font-size: 12px; }
.pager a.next { text-align: right; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.grid a { text-decoration: none; color: var(--ink); background: var(--card); border: 2px solid var(--line); border-radius: 18px; padding: 16px 18px; display: grid; gap: 4px; }
.grid a b { font: 400 19px var(--f-display); } .grid a small { color: var(--sub); font-size: 13px; line-height: 1.5; }
.grid a .no { font: 700 13px var(--f-key); color: var(--cobalt); }
.section-title { font: 400 22px var(--f-display); margin: 30px 0 12px; }
.fingers { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.fingers div { background: var(--card); border: 2px solid var(--line); border-radius: 14px; padding: 12px 14px; }
.fingers b { display: block; font-size: 15px; margin-bottom: 4px; }

footer { background: var(--ink); color: #c9d2df; padding: 40px 0 max(32px, env(safe-area-inset-bottom, 0px)); font-size: 14px; }
footer .wrap { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 24px; }
footer h4 { color: #fff; margin: 0 0 8px; font-size: 15px; }
footer a { color: #c9d2df; text-decoration: none; display: block; line-height: 2; } footer a:hover { color: #fff; }
footer .copy { grid-column: 1 / -1; border-top: 1px solid #ffffff22; padding-top: 16px; color: #8b97ab; }

@media (max-width: 960px) {
  .page { grid-template-columns: minmax(0, 1fr); }
  .aside { position: static; }
  .nav nav { display: none; }
  footer .wrap { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}