#km-guide { max-width: var(--content); margin: 0 auto; padding: 0 1.5rem 4rem; }
#km-guide [hidden] { display: none !important; }
#km-guide .km-header { padding: 0 0 2rem; border-bottom: 1px solid var(--line); }
#km-guide .breadcrumb { padding: 1.25rem 0; }
#km-guide h1 { max-width: 26ch; margin: .4rem 0 .8rem; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.12; }
#km-guide .lead { max-width: 55rem; margin: 0; color: var(--muted); font-size: 1.1rem; }
#km-guide .km-shell { display: grid; grid-template-columns: 13rem minmax(0, 1fr); gap: 2.5rem; }
#km-guide .km-toc { position: sticky; top: 1rem; align-self: start; display: grid; gap: .4rem; padding-top: 2rem; }
#km-guide .km-toc a { padding: .5rem .65rem; border-left: 2px solid var(--line); color: var(--muted); font-size: .85rem; font-weight: 600; text-decoration: none; }
#km-guide .km-toc a:hover, #km-guide .km-toc a:focus-visible { border-color: var(--teal); color: var(--teal); background: var(--cloud); }
#km-guide .km-content { min-width: 0; }
#km-guide .km-content > section { padding: 2rem 0; border-bottom: 1px solid var(--line); scroll-margin-top: 1rem; }
#km-guide h2 { margin: .3rem 0 1rem; font-size: clamp(1.5rem, 3vw, 2rem); line-height: 1.2; }
#km-guide h3 { margin: 1.5rem 0 .5rem; font-size: 1.2rem; }
#km-guide p { max-width: 70ch; }
#km-guide .eyebrow { margin: 0 0 .5rem; }
#km-guide .km-case-lead { font-size: 1.06rem; }
#km-guide .km-case-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; padding: 1rem; background: var(--cloud); border: 1px solid var(--line); }
#km-guide dt { color: var(--muted); font-size: .78rem; }
#km-guide dd { margin: .2rem 0 0; color: var(--ink); font-weight: 700; }
#km-guide .km-note { padding-left: .9rem; border-left: 3px solid var(--teal); color: var(--muted); font-size: .85rem; }
#km-guide details { margin: 1rem 0; padding: .8rem 1rem; border: 1px solid var(--line); background: var(--white); border-radius: var(--radius); }
#km-guide summary { cursor: pointer; color: var(--ink); font-size: .9rem; font-weight: 700; }
#km-guide details[open] > summary { margin-bottom: 1rem; }
#km-guide button { cursor: pointer; min-height: 2.75rem; padding: .55rem .85rem; border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); background: var(--white); font: inherit; font-size: .88rem; font-weight: 650; }
#km-guide button:hover { border-color: var(--teal); }
#km-guide button:disabled { opacity: .45; cursor: default; }
#km-guide :is(button,input,a,summary):focus-visible { outline: 3px solid var(--teal-light); outline-offset: 3px; }
#km-guide .km-interactive { padding: 1.25rem; border: 1px solid var(--line); border-top: 3px solid var(--teal); border-radius: var(--radius); background: var(--cloud); }
#km-guide .km-controls { display: grid; grid-template-columns: auto minmax(5rem, 1fr) auto; gap: 1rem; align-items: center; }
#km-guide .km-controls label { color: var(--ink); font-weight: 700; font-size: .86rem; }
#km-guide #km-month { width: 100%; accent-color: var(--teal); min-height: 2.75rem; cursor: pointer; }
#km-guide .km-step-buttons { display: flex; gap: .35rem; }
#km-guide .km-explorer { display: grid; grid-template-columns: minmax(0, 1fr) 10rem; gap: 1.5rem; align-items: center; margin-top: 1rem; }
#km-guide #km-chart { display: block; width: 100%; height: auto; background: var(--white); }
#km-guide .km-grid path { fill: none; stroke: var(--line); stroke-width: 1; }
#km-guide .km-axis path { fill: none; stroke: var(--muted); }
#km-guide .km-axis text { fill: var(--muted); font-size: 13px; font-family: inherit; }
#km-guide #km-curve { fill: none; stroke: var(--teal); stroke-width: 3; stroke-linejoin: round; }
#km-guide .km-event { fill: var(--teal); }
#km-guide .km-censor { stroke: var(--ink); stroke-width: 2; fill: none; }
#km-guide .km-step-values { margin: 0; display: grid; gap: .6rem; }
#km-guide .km-step-values dd { font-size: 1.4rem; line-height: 1.15; }
#km-guide #km-step-explanation { color: var(--muted); font-size: .82rem; margin: .75rem 0 0; }
#km-guide .km-calculation { max-width: none; margin: 1rem 0 0; padding-top: .75rem; border-top: 1px solid var(--line); font-size: .9rem; }
#km-guide .km-legend { margin-bottom: 0; font-size: .8rem; color: var(--muted); }
#km-guide .km-table-scroll { width: 100%; overflow-x: auto; margin: 1.1rem 0; }
#km-guide table { border-collapse: collapse; width: 100%; min-width: 27rem; text-align: left; font-size: .9rem; font-variant-numeric: tabular-nums; }
#km-guide th, #km-guide td { padding: .7rem .65rem; border-bottom: 1px solid var(--line); }
#km-guide th { color: var(--ink); font-size: .8rem; background: var(--cloud); }
#km-guide td + td, #km-guide th + th { text-align: right; }
#km-guide caption { text-align: left; margin-bottom: .65rem; color: var(--muted); font-size: .85rem; }
#km-guide .km-tabs { display: flex; gap: .5rem; margin: 1.5rem 0; }
#km-guide .km-tabs button[aria-selected="true"] { color: var(--white); background: var(--teal); border-color: var(--teal); }
#km-guide [role="tabpanel"] { min-width: 0; }
#km-guide li { margin-bottom: .65rem; }
#km-guide ol { padding-left: 1.4rem; }
#km-guide pre { max-width: 100%; overflow-x: auto; padding: 1rem; background: var(--cloud); border: 1px solid var(--line); font-size: .83rem; line-height: 1.55; }
#km-guide code { font-family: Consolas, "Courier New", monospace; }
#km-guide p code { overflow-wrap: anywhere; }
#km-guide #km-copy-status { min-height: 1.5rem; margin: .4rem 0; font-size: .8rem; color: var(--muted); }
#km-guide .km-capture figure { margin: 0; }
#km-guide .km-capture img { height: auto; width: 100%; border: 1px solid var(--line); }
#km-guide figcaption, #km-guide .km-capture p { font-size: .82rem; color: var(--muted); }
#km-guide .km-question { min-width: 0; margin: 1.5rem 0; padding: 1rem 1.25rem; border: 1px solid var(--line); border-radius: var(--radius); }
#km-guide .km-question legend { padding: 0 .35rem; color: var(--ink); font-weight: 700; line-height: 1.4; }
#km-guide .km-question > label { display: flex; align-items: flex-start; gap: .65rem; min-height: 2.75rem; margin: .25rem 0; padding: .6rem; background: var(--cloud); cursor: pointer; font-size: .92rem; }
#km-guide .km-question input { flex: 0 0 auto; margin: .3rem 0 0; accent-color: var(--teal); }
#km-guide .km-feedback:empty { display: none; }
#km-guide .km-feedback { margin: .75rem 0; padding: .7rem .85rem; border-left: 3px solid var(--ink); background: var(--cloud); font-size: .9rem; }
#km-guide .km-feedback[data-state="correct"] { border-color: var(--teal); }
#km-guide .km-answer { margin-bottom: 0; }
@media (max-width: 1000px) {
  #km-guide .km-shell { grid-template-columns: minmax(0, 1fr); gap: 0; }
  #km-guide .km-toc { position: static; grid-template-columns: repeat(3, 1fr); gap: .3rem; padding-top: 1rem; }
}
@media (max-width: 650px) {
  #km-guide { padding-inline: 1rem; }
  #km-guide .km-header { padding-bottom: 1.5rem; }
  #km-guide .km-toc { grid-template-columns: repeat(2, 1fr); }
  #km-guide .km-toc a { padding: .4rem; font-size: .8rem; }
  #km-guide .km-case-facts { grid-template-columns: 1fr; gap: .6rem; }
  #km-guide .km-controls { grid-template-columns: minmax(0, 1fr); gap: .2rem; }
  #km-guide .km-step-buttons { flex-wrap: wrap; }
  #km-guide .km-interactive { padding: .85rem; }
  #km-guide .km-explorer { grid-template-columns: minmax(0, 1fr); gap: .75rem; }
  #km-guide .km-axis text { font-size: 20px; }
  #km-guide .km-step-values { grid-template-columns: repeat(3, 1fr); gap: .4rem; }
  #km-guide .km-step-values dt { font-size: .7rem; line-height: 1.35; }
  #km-guide .km-step-values dd { font-size: 1.25rem; }
  #km-guide .km-tabs button { flex: 1; }
  #km-guide .km-question { padding: .75rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }