/* /how-to-play/ hub and technique pages */
.tech-wrap { padding-top: var(--sp-4); }
.tech-crumbs { margin: 0 0 var(--sp-3); }
.tech-crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 0; font-size: 13px; color: var(--ink-3); }
.tech-crumbs a { color: var(--ink-2); text-decoration: none; }
.tech-head { text-align: left; max-width: none; margin: 0 0 var(--sp-5); }
.tech-head h1 { font-family: var(--font-display); font-size: clamp(28px, 4.5vw, 40px); letter-spacing: -.02em; margin: 6px 0 8px; }
.tech-tagline { color: var(--ink-2); font-size: 17px; max-width: 720px; }
.tech-level { display: inline-block; font-size: 11.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 4px 10px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); }
.tech-level--beginner { background: #E6F6F1; color: #0B7A5A; }
.tech-level--intermediate { background: #FFF3E0; color: #9A5B00; }
.tech-level--advanced { background: #F3E8FF; color: #6D28D9; }
[data-theme="dark"] .tech-level--beginner { background: #123B31; color: #7BE0C0; }
[data-theme="dark"] .tech-level--intermediate { background: #3D2A0A; color: #F5C170; }
[data-theme="dark"] .tech-level--advanced { background: #2D1F4A; color: #C9A9FF; }

.tech-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: var(--sp-6); align-items: start; }
.tech-prose { max-width: 760px; }
.tech-prose h2 { scroll-margin-top: 90px; }
.tech-side { position: sticky; top: 84px; display: flex; flex-direction: column; gap: var(--sp-4); }
.side-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: var(--sp-4) var(--sp-5); }
.side-card h2 { font-family: var(--font-ui); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-3); margin: 0 0 var(--sp-3); }
.tech-toc { margin: 0; padding-left: 18px; font-size: 14px; line-height: 1.7; }
.tech-toc a { color: var(--ink-2); text-decoration: none; }
.tech-toc a:hover { color: var(--brand); }
.tech-related { list-style: none; margin: 0; padding: 0; }
.tech-related li + li { border-top: 1px solid var(--line); }
.tech-related a { display: block; padding: 10px 0; text-decoration: none; color: var(--ink); }
.tech-related b { display: block; font-size: 14.5px; }
.tech-related span { display: block; font-size: 13px; color: var(--ink-3); margin-top: 2px; }
.tech-all { display: inline-block; margin-top: var(--sp-3); font-size: 13.5px; font-weight: 600; color: var(--brand); text-decoration: none; }

.tech-practice { display: flex; gap: var(--sp-5); align-items: center; justify-content: space-between; margin: var(--sp-6) 0; padding: var(--sp-5); background: var(--brand-soft); border-radius: var(--r-lg); }
.tech-practice b { display: block; font-size: 17px; margin-bottom: 4px; }
.tech-practice p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
.tech-practice .btn { white-space: nowrap; }

/* Step-through demo board */
.tdemo-wrap { margin: var(--sp-6) 0; }
.tdemo-caption { color: var(--ink-2); }
.tdemo { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: var(--sp-4); }
.tdemo-board { display: grid; grid-template-columns: repeat(9, 1fr); width: 100%; max-width: 440px; aspect-ratio: 1; margin: 0 auto; border: 2.5px solid var(--ink); border-radius: 6px; overflow: hidden; background: var(--surface); }
.tdemo-cell { position: relative; display: grid; place-items: center; font-family: var(--font-display); font-size: clamp(16px, 3.6vw, 24px); border-right: 1px solid var(--line-2); border-bottom: 1px solid var(--line-2); color: var(--ink); }
.tdemo-cell:nth-child(9n) { border-right: none; }
.tdemo-cell:nth-child(n+73) { border-bottom: none; }
.tdemo-cell:nth-child(3n):not(:nth-child(9n)) { border-right: 2px solid var(--ink); }
.tdemo-cell:nth-child(n+19):nth-child(-n+27), .tdemo-cell:nth-child(n+46):nth-child(-n+54) { border-bottom: 2px solid var(--ink); }
.tdemo-cell.given { font-weight: 700; }
.tdemo-cell.placed { color: var(--brand); font-weight: 700; }
.tdemo-cell.fresh { animation: tdemo-pop .35s ease-out; background: color-mix(in srgb, var(--brand) 14%, transparent); }
.tdemo-cell.peer { background: color-mix(in srgb, var(--brand) 8%, transparent); }
.tdemo-cell.focus { background: color-mix(in srgb, var(--warn, #D97706) 22%, transparent); box-shadow: inset 0 0 0 2px var(--warn, #D97706); z-index: 1; }
.tdemo-notes { display: grid; grid-template-columns: repeat(3, 1fr); width: 100%; height: 100%; padding: 2px; }
.tdemo-notes i { font-style: normal; font-family: var(--font-ui); font-size: clamp(8px, 1.6vw, 11px); line-height: 1; display: grid; place-items: center; color: var(--ink-2); }
.tdemo-notes i.x { color: var(--err, #E11D48); text-decoration: line-through; font-weight: 700; }
.tdemo-text { margin: var(--sp-4) 0 var(--sp-3); font-size: 15.5px; line-height: 1.55; min-height: 2.4em; }
.tdemo-ctl { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); }
.tdemo-btn { height: 40px; padding: 0 16px; border-radius: var(--r-md); border: 1px solid var(--line-2); background: var(--surface-2); color: var(--ink); font-weight: 600; font-size: 14px; cursor: pointer; }
.tdemo-btn--primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.tdemo-btn:disabled { opacity: .45; cursor: default; }
.tdemo-count { font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
@keyframes tdemo-pop { from { transform: scale(.7); } to { transform: none; } }

/* Hub */
.hub-levels { display: grid; gap: var(--sp-6); margin: var(--sp-6) 0; }
.hub-level h2 { font-family: var(--font-display); font-size: 22px; letter-spacing: -.02em; margin-bottom: 4px; }
.hub-level > p { color: var(--ink-2); margin-bottom: var(--sp-4); }
.hub-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: var(--sp-3); }
.hub-card { display: block; padding: var(--sp-4); background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); text-decoration: none; color: var(--ink); transition: transform .15s, box-shadow .15s; }
.hub-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md, 0 8px 24px -12px rgba(0,0,0,.25)); }
.hub-card b { display: block; font-size: 16px; margin-bottom: 4px; }
.hub-card span { display: block; font-size: 13.5px; color: var(--ink-2); line-height: 1.5; }
.hub-rules { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 400px); gap: var(--sp-6); align-items: start; }

@media (max-width: 980px) {
  .tech-grid { grid-template-columns: 1fr; }
  .tech-side { position: static; }
  .hub-rules { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .tech-practice { flex-direction: column; align-items: stretch; text-align: center; }
  .tech-head h1 { font-size: 28px; }
}

/* Link affordance: cards and related items must read as clickable */
.hub-card { position: relative; padding-right: 44px; border-color: var(--line-2); }
.hub-card b { color: var(--brand); }
.hub-card::after { content: ""; position: absolute; right: 16px; top: 18px; width: 10px; height: 10px; border-right: 2px solid var(--brand); border-bottom: 2px solid var(--brand); transform: rotate(-45deg); opacity: .7; transition: transform .15s, opacity .15s; }
.hub-card:hover { border-color: var(--brand); }
.hub-card:hover::after { transform: translateX(4px) rotate(-45deg); opacity: 1; }
.hub-card:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }
.tech-related a { position: relative; padding-right: 26px; }
.tech-related b { color: var(--brand); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--brand) 35%, transparent); text-underline-offset: 3px; }
.tech-related a::after { content: ""; position: absolute; right: 6px; top: 16px; width: 8px; height: 8px; border-right: 2px solid var(--brand); border-bottom: 2px solid var(--brand); transform: rotate(-45deg); opacity: .6; }
.tech-related a:hover b { text-decoration-color: var(--brand); }
.tech-toc a { text-decoration: underline; text-decoration-color: var(--line-2); text-underline-offset: 3px; }
.tech-toc a:hover { text-decoration-color: var(--brand); }
.tech-prose a:not(.btn), .hub-rules .prose a:not(.btn) { color: var(--brand); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.tech-prose a:not(.btn):hover, .hub-rules .prose a:not(.btn):hover { text-decoration-thickness: 2px; }
/* Button-styled links keep white text on the brand background in every theme. */
.tech-practice .btn, .tech-practice .btn:hover { color: #fff; text-decoration: none; }