/* --- THE PAGE A STRANGER ARRIVES AT ---------------------------------------
     THE SAME TOKENS AS EVERY OTHER PAGE. A landing page with its own design
     language is a brochure for a different product; what changes here is the
     SPACING, because a reader with no context needs air and a reader with a
     book needs density. */
  .ab-wrap { max-width: 62rem; }
  .ab-head { display: flex; align-items: center; justify-content: space-between;
    gap: 1rem; padding: .4rem 0 2.2rem; }
  .ab-mark { display: flex; align-items: center; }
  .ab-nav { display: flex; align-items: center; gap: .6rem; }

  .ab-hero { padding: 1rem 0 3rem; border-bottom: 1px solid var(--border);
    margin-bottom: 2.6rem; }
  .ab-hero h1 { font-size: clamp(1.9rem, 4.2vw, 3rem); line-height: 1.12;
    letter-spacing: -.025em; font-weight: 700; margin: 0 0 1rem;
    max-width: 24ch; }
  .ab-sub { font-size: var(--fs-lg); line-height: 1.55; color: var(--muted);
    max-width: 58ch; margin: 0 0 1.4rem; }
  /* THE ONE SENTENCE THAT IS THE WHOLE ARGUMENT, set apart and quiet. A
     service whose distinguishing feature is candour cannot shout it. */
  .ab-claim { font-size: var(--fs-sm2); line-height: 1.6; max-width: 62ch;
    margin: 0; padding: .85rem 1rem; background: var(--card);
    border: 1px solid var(--border); border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm); }

  .ab-sec { margin: 0 0 3rem; }
  .ab-sec h2 { font-size: var(--fs-xl); letter-spacing: -.015em;
    margin: 0 0 .8rem; }
  .ab-sec-quiet { padding: 1.6rem; background: var(--card);
    border: 1px solid var(--border); border-radius: var(--radius); }
  .ab-lead { font-size: var(--fs-sm2); line-height: 1.65; color: var(--muted);
    max-width: 68ch; margin: 0 0 1.2rem; }

  .ab-steps { list-style: none; margin: 0; padding: 0; display: grid;
    gap: .1rem; }
  .ab-steps li { display: grid; grid-template-columns: 2rem 1fr; gap: .9rem;
    align-items: start; padding: .9rem 0;
    border-top: 1px solid var(--border); }
  .ab-n { width: 1.7rem; height: 1.7rem; border-radius: 999px;
    background: var(--accent); color: var(--on-accent); font-weight: 700;
    font-size: var(--fs-xs); line-height: 1.7rem; text-align: center; }
  .ab-steps b { display: block; font-size: var(--fs-sm2); margin-bottom: .2rem; }
  .ab-steps p { margin: 0; font-size: var(--fs-sm); line-height: 1.6;
    color: var(--muted); max-width: 66ch; }

  .ab-bullets { list-style: none; margin: 0 0 1.2rem; padding: 0;
    display: grid; gap: .9rem; }
  .ab-bullets b { display: block; font-size: var(--fs-sm2); }
  .ab-bullets span { font-size: var(--fs-sm); line-height: 1.6;
    color: var(--muted); max-width: 66ch; display: block; }

  .ab-figs { display: grid; gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
    margin: 0 0 1rem; }
  .ab-fig { padding: 1rem 1.1rem; background: var(--card);
    border: 1px solid var(--border); border-radius: var(--radius-sm); }
  .ab-fig span { display: block; font-size: var(--fs-2xs); color: var(--muted);
    text-transform: uppercase; letter-spacing: .06em; margin-bottom: .35rem; }
  .ab-fig b { font-size: var(--fs-xl); font-weight: 700;
    letter-spacing: -.02em; }
  .ab-note { font-size: var(--fs-xs); max-width: 66ch; }
  .ab-none { font-size: var(--fs-sm2); color: var(--muted); }

  /* --- HOW MUCH OF THE MARKET IS WATCHED -----------------------------------
     Four counts under the opening claim. `auto-fit` rather than a fixed four
     columns: at 380px these stack two and two instead of shrinking to a
     column of hairlines. */
  .ab-cov { display: grid; gap: .1rem; margin: 2rem 0 0;
    grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    overflow: hidden; background: var(--card); }
  .ab-cov-cell { padding: .95rem 1.05rem; background: var(--card);
    box-shadow: var(--lift); }
  .ab-cov-cell b { display: block; font-size: var(--fs-xl); font-weight: 700;
    letter-spacing: -.02em; line-height: 1.15;
    /* TABULAR FIGURES so four counts of different widths line up rather than
       drifting against each other. */
    font-variant-numeric: tabular-nums; }
  .ab-cov-cell span { display: block; font-size: var(--fs-2xs);
    color: var(--muted); text-transform: uppercase; letter-spacing: .06em;
    margin-top: .3rem; }

  /* --- WHAT A FIXED YIELD IS, DRAWN ----------------------------------------
     The diagram scales proportionally, so it is given a max width rather than
     the full column: stretched to 62rem the curve flattens into a line and
     stops showing the one thing it exists to show. */
  .ab-fig-wrap { margin: 0; }
  .ab-diagram { display: block; width: 100%; max-width: 40rem; height: auto; }
  .abd-par { stroke: var(--accent-line); stroke-width: 1.5;
    stroke-dasharray: 5 4; }
  .abd-axis { stroke: var(--border); stroke-width: 1.5; }
  .abd-curve { fill: none; stroke: var(--pos); stroke-width: 2.5;
    stroke-linecap: round; }
  .abd-dot { fill: var(--bg); stroke: var(--pos); stroke-width: 2.5; }
  .abd-dot-end { fill: var(--pos); }
  .abd-gap { stroke: var(--muted); stroke-width: 1.2; }
  .abd-lab { fill: var(--muted); font-size: 13px;
    font-family: inherit; }
  .abd-gap-lab { fill: var(--text); font-size: 13px; font-weight: 600;
    font-family: inherit; }
  .ab-fig-wrap figcaption { font-size: var(--fs-xs); color: var(--muted);
    max-width: 62ch; margin-top: .9rem; line-height: 1.6; }

  /* --- THE REGISTER, TO SCALE ---------------------------------------------- */
  .ab-reg { margin: 0 0 1.6rem; }
  .abr-bar { display: flex; height: .55rem; border-radius: 999px;
    overflow: hidden; background: var(--bg2); gap: 2px; }
  .abr-seg { display: block; min-width: 3px; }
  /* Three states, three inks already in the palette. `unchecked` is warn and
     not neg: nobody has graded it, which is a gap and not a failure. */
  .abr-scored { background: var(--pos); }
  .abr-pending { background: var(--accent); }
  .abr-unchecked { background: var(--warn); }
  .abr-keys { list-style: none; display: flex; flex-wrap: wrap; gap: .3rem 1.2rem;
    margin: .8rem 0 0; padding: 0; font-size: var(--fs-xs);
    color: var(--muted); }
  .abr-keys li { display: flex; align-items: center; gap: .4rem; }
  .abr-keys b { color: var(--text); font-variant-numeric: tabular-nums; }
  .abr-key { width: .55rem; height: .55rem; border-radius: 2px;
    display: inline-block; flex: none; }

  .ab-link { display: inline-flex; align-items: center; gap: .35rem;
    color: var(--accent); text-decoration: none; font-weight: 600;
    font-size: var(--fs-sm2); }
  .ab-foot { margin-top: 3rem; padding-top: 1.2rem;
    border-top: 1px solid var(--border); font-size: var(--fs-xs);
    color: var(--muted); }
  @media (max-width: 620px) {
    .ab-hero { padding-bottom: 2rem; }
    .ab-sec-quiet { padding: 1.1rem; }
  }