.eqa-section { scroll-margin-top: 72px; }
.eqa-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; margin-bottom: 38px; }
.eqa-intro h2 { margin: 0; font-size: clamp(36px, 4.2vw, 60px); letter-spacing: -.045em; line-height: 1.05; }
.eqa-intro h2 span { color: var(--accent); }
.eqa-deck { max-width: 350px; margin: 0 0 3px; color: var(--ink-2); font-size: 18px; line-height: 1.55; }
.eqa-missions { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--hairline); border-bottom: 0; border-radius: 12px 12px 0 0; overflow: hidden; }
.eqa-missions button { padding: 22px 24px; background: var(--surface-2); border: 0; border-right: 1px solid var(--hairline); text-align: left; color: var(--ink-2); cursor: pointer; position: relative; font-family: var(--font-sans); }
.eqa-missions button:last-child { border-right: 0; }
.eqa-missions button[aria-selected="true"] { background: var(--surface); color: var(--ink); }
.eqa-missions button[aria-selected="true"]::before { content: ''; position: absolute; inset: 0 0 auto; height: 3px; background: var(--accent); }
.eqa-missions small { display: block; font: 500 10px var(--font-mono); letter-spacing: .08em; margin-bottom: 8px; }
.eqa-missions button[aria-selected="true"] small { color: var(--accent); }
.eqa-missions strong { display: block; font-size: 18px; font-weight: 500; margin-bottom: 4px; }
.eqa-missions button > span { color: var(--muted); font-size: 12px; }
.eqa-stage { border: 1px solid var(--hairline); border-top: 0; background: var(--surface); border-radius: 0 0 12px 12px; overflow: hidden; }
.eqa-mission-head { padding: 22px 24px; display: flex; align-items: center; gap: 24px; justify-content: space-between; }
.eqa-eyebrow { color: var(--muted); font: 10px var(--font-mono); letter-spacing: .1em; margin: 0 0 7px; }
.eqa-mission-head h3 { font-size: 19px; font-weight: 500; line-height: 1.4; margin: 0; max-width: 780px; }
.eqa-skill { border-left: 1px solid var(--hairline); padding-left: 24px; flex-shrink: 0; }
.eqa-skill span { display: block; color: var(--muted); font: 9px var(--font-mono); letter-spacing: .1em; margin-bottom: 5px; }
.eqa-skill code { color: var(--accent); font: 12px var(--font-mono); }
.eqa-screen { position: relative; aspect-ratio: 16 / 9; background: #efefea; }
.eqa-screen video { width: 100%; height: 100%; display: block; object-fit: contain; }
.eqa-start { position: absolute; left: 24px; bottom: 65px; border: 1px solid rgba(11,11,11,.12); border-radius: 8px; background: rgba(252,252,251,.97); color: #0b0b0b; padding: 13px 18px; display: flex; align-items: center; gap: 13px; cursor: pointer; box-shadow: 0 4px 24px #0002; font: 500 15px var(--font-sans); text-align: left; }
.eqa-start[hidden] { display: none; }
.eqa-start small { display: block; font: 10px var(--font-mono); color: #6f6e69; margin-top: 4px; }
.eqa-play-icon { width: 32px; height: 32px; background: #2a78d6; color: #fff; display: grid; place-items: center; border-radius: 50%; font-size: 12px; }
.eqa-chapters { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--hairline); }
.eqa-chapters button { cursor: pointer; position: relative; padding: 17px 20px; border: 0; border-right: 1px solid var(--hairline); background: transparent; color: var(--ink-2); text-align: left; font-family: var(--font-sans); }
.eqa-chapters button:last-child { border-right: 0; }
.eqa-chapters button small { display: block; font: 10px var(--font-mono); color: var(--muted); margin-bottom: 6px; }
.eqa-chapters button strong { font-size: 14px; font-weight: 500; }
.eqa-chapters button[aria-current="true"] { color: var(--accent); background: color-mix(in srgb, var(--accent) 5%, var(--surface)); }
.eqa-chapters button[aria-current="true"]::after { content: ''; position: absolute; bottom: 0; left: 0; height: 2px; width: var(--chapter-progress, 0%); background: var(--accent); }
.eqa-story-footer { display: flex; gap: 24px; align-items: center; justify-content: space-between; margin-top: 20px; }
.eqa-story-footer p { color: var(--ink-2); line-height: 1.5; max-width: 780px; margin: 0; font-size: 15px; }
.eqa-code-jump { background: transparent; border: 0; color: var(--accent); cursor: pointer; padding: 9px 0; flex-shrink: 0; font: 500 13px var(--font-sans); }
.eqa-code-time { padding-left: 8px; font: 10px var(--font-mono); }
.eqa-provenance { margin: 14px 0 0; color: var(--muted); font-size: 11px; line-height: 1.5; }
.eqa-section button:focus-visible { outline: 2px solid var(--accent); outline-offset: -4px; }
@media (max-width: 760px) {
  .eqa-intro { display: block; margin-bottom: 26px; }
  .eqa-deck { margin-top: 20px; max-width: none; font-size: 16px; }
  .eqa-missions button { padding: 15px 12px; }
  .eqa-missions strong { font-size: 14px; }
  .eqa-missions button > span { font-size: 10px; }
  .eqa-mission-head { padding: 16px; display: block; }
  .eqa-mission-head h3 { font-size: 16px; }
  .eqa-skill { border: 0; padding: 0; margin-top: 12px; display: flex; gap: 10px; align-items: center; }
  .eqa-skill span { margin: 0; }
  .eqa-chapters button { padding: 14px 9px; }
  .eqa-chapters button strong { font-size: 11px; }
  .eqa-chapters button small { font-size: 9px; }
  .eqa-start { left: 12px; bottom: 45px; padding: 8px 10px; font-size: 12px; }
  .eqa-start small { font-size: 8px; }
  .eqa-play-icon { width: 25px; height: 25px; }
  .eqa-story-footer { display: block; }
  .eqa-story-footer p { font-size: 13px; }
  .eqa-code-jump { margin-top: 6px; }
}