/* CardioBoardExam site styles. Layout: authored reference page, one reading column, sticky contents rail on wide screens. Brand: navy ink, crimson mark. */
:root {
  --bg: #fbfcfd; --surface: #ffffff; --ink: #0d1f3a; --muted: #4f5d73; --rule: #dbe2ea;
  --navy: #0a2247; --crimson: #b3263c; --teal: #0f7480; --tint: #eef4f8; --warn-bg: #fdf3e6; --warn: #8a5300;
  --sev: #b3263c; --mod: #a96a00; --mild: #2f7a4a;
  --display: "Literata", Georgia, "Times New Roman", serif;
  --body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0c1420; --surface: #121c2b; --ink: #e5ebf2; --muted: #9eabbd; --rule: #263347;
  --navy: #c9d8ee; --crimson: #f07a8c; --teal: #5fc2cc; --tint: #16233a; --warn-bg: #2e2412; --warn: #f2c06b;
  --sev: #f07a8c; --mod: #f2c06b; --mild: #7fd19b; color-scheme: dark } }
:root[data-theme="dark"] {
  --bg: #0c1420; --surface: #121c2b; --ink: #e5ebf2; --muted: #9eabbd; --rule: #263347;
  --navy: #c9d8ee; --crimson: #f07a8c; --teal: #5fc2cc; --tint: #16233a; --warn-bg: #2e2412; --warn: #f2c06b;
  --sev: #f07a8c; --mod: #f2c06b; --mild: #7fd19b; color-scheme: dark }

* { box-sizing: border-box; }
body { background: var(--bg); color: var(--ink); font-family: var(--body); font-size: 17px; line-height: 1.6; }
a { color: var(--teal); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--crimson); outline-offset: 2px; }

.bar { border-bottom: 1px solid var(--rule); background: var(--surface); padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.bar-in { max-width: 1180px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-block: 14px; }
.mark { font-family: var(--display); font-weight: 650; font-size: 21px; color: var(--navy); text-decoration: none; letter-spacing: -0.01em; }
.mark span { color: var(--crimson); }
.nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 15px; font-weight: 500; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a[aria-current] { color: var(--crimson); }
.nav .cta { color: var(--crimson); font-weight: 600; }

.wrap { max-width: 1180px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); padding-block: 28px 64px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; }
@media (min-width: 1000px) { .wrap { grid-template-columns: 220px minmax(0, 720px); justify-content: center; } }

.rail { display: none; }
@media (min-width: 1000px) { .rail { display: block; position: sticky; top: 24px; align-self: start; font-size: 14px; } }
.rail h2 { font-family: var(--body); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; font-weight: 600; }
.rail ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; border-left: 1px solid var(--rule); }
.rail a { color: var(--muted); text-decoration: none; padding-left: 12px; display: block; }
.rail a:hover { color: var(--ink); }

article { min-width: 0; }
.crumb { font-size: 14px; color: var(--muted); margin: 0 0 14px; }
.crumb a { color: var(--muted); }
h1 { font-family: var(--display); font-weight: 650; font-size: clamp(30px, 5vw, 44px); line-height: 1.12; letter-spacing: -0.015em; margin: 0 0 12px; text-wrap: balance; color: var(--navy); }
.dek { font-size: 19px; color: var(--muted); margin: 0 0 18px; max-width: 62ch; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 14px; color: var(--muted); padding-block: 12px; border-block: 1px solid var(--rule); margin-bottom: 28px; }
.meta b { color: var(--ink); font-weight: 600; }

h2 { font-family: var(--display); font-weight: 650; font-size: 26px; line-height: 1.25; margin: 44px 0 12px; text-wrap: balance; color: var(--navy); scroll-margin-top: 16px; }
h3 { font-size: 18px; font-weight: 600; margin: 24px 0 6px; }
p { margin: 0 0 14px; max-width: 68ch; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: .92em; }

.keyline { background: var(--tint); border-left: 3px solid var(--navy); padding: 14px 18px; margin: 0 0 8px; }
.keyline p { margin: 0; }

.tbl { overflow-x: auto; margin: 8px 0 6px; border: 1px solid var(--rule); background: var(--surface); }
table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
thead th { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); font-weight: 600; background: var(--tint); }
tbody th { font-weight: 600; }
td.num { white-space: nowrap; }
.sev { color: var(--sev); font-weight: 600; }
.cap { font-size: 14px; color: var(--muted); margin: 6px 0 0; }

.tool { margin: 18px 0 8px; border: 1px solid var(--rule); background: var(--surface); }
.tool-h { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; padding: 12px 16px; border-bottom: 1px solid var(--rule); background: var(--tint); }
.tool-h h3 { margin: 0; font-size: 16px; }
.tool-h span { font-size: 13px; color: var(--muted); }
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px 16px; padding: 16px; }
.fields label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); font-weight: 500; }
.fields input { font: 500 17px/1.2 var(--mono); padding: 9px 10px; border: 1px solid var(--rule); background: var(--bg); color: var(--ink); width: 100%; min-width: 0; }
.out { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0; border-top: 1px solid var(--rule); }
.out div { padding: 12px 16px; border-right: 1px solid var(--rule); }
.out div:last-child { border-right: 0; }
.out small { display: block; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.out strong { font: 600 24px/1.2 var(--mono); font-variant-numeric: tabular-nums; }
.verdict { padding: 12px 16px; border-top: 1px solid var(--rule); font-size: 15px; }
.verdict b.s { color: var(--sev); } .verdict b.m { color: var(--mod); } .verdict b.l { color: var(--mild); }

ol.steps { padding-left: 22px; margin: 0 0 14px; display: grid; gap: 8px; max-width: 68ch; }
.errs { padding-left: 22px; display: grid; gap: 8px; max-width: 68ch; margin: 0 0 14px; }
.pit { display: grid; gap: 12px; margin: 8px 0; }
.pit div { padding: 12px 16px; background: var(--warn-bg); }
.pit b { color: var(--warn); }

figure { margin: 20px 0; }
.sketch { background: var(--surface); border: 1px solid var(--rule); padding: 12px; }
.sketch svg { width: 100%; height: auto; display: block; }
figcaption { font-size: 14px; color: var(--muted); margin-top: 6px; }

.board { margin: 36px 0 8px; padding: 20px; background: var(--navy); color: var(--bg); display: grid; gap: 10px; }
.board h2 { color: var(--bg); margin: 0; font-size: 22px; }
.board p { margin: 0; color: var(--bg); opacity: .9; }
.board .q { font-family: var(--display); font-size: 18px; }
.board a.btn { justify-self: start; background: var(--crimson); color: #fff; text-decoration: none; font-weight: 600; padding: 10px 16px; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .board a.btn { color: #0c1420; } }
:root[data-theme="dark"] .board a.btn { color: #0c1420; }

.book { display: flex; gap: 16px; align-items: center; padding: 16px; border: 1px solid var(--rule); margin: 18px 0; background: var(--surface); flex-wrap: wrap; }
.book .spine { width: 54px; height: 72px; background: var(--crimson); flex: none; }
.book div { min-width: 0; flex: 1; }
.book p { margin: 0; font-size: 15px; }
.disclose { font-size: 13px; color: var(--muted); }

.refs { font-size: 15px; padding-left: 22px; display: grid; gap: 8px; max-width: 68ch; }
.related { display: flex; flex-wrap: wrap; gap: 8px; }
.related a { border: 1px solid var(--rule); padding: 6px 12px; font-size: 14px; text-decoration: none; color: var(--ink); background: var(--surface); }
.related a:hover { border-color: var(--teal); }
footer { border-top: 1px solid var(--rule); color: var(--muted); font-size: 13px; padding-block: 20px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
footer div { max-width: 1180px; margin: 0 auto; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

:root { padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); }
body { margin: 0; }
img { max-width: 100%; height: auto; }
.lib-list { display: grid; gap: 28px; }
.lib-list h2 { margin-top: 0; }
.lib-list ul { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--surface); padding: 8px 12px; z-index: 20; }
.fields select { font: 500 16px/1.2 var(--body); padding: 9px 10px; border: 1px solid var(--rule); background: var(--bg); color: var(--ink); width: 100%; min-width: 0; }
.fields input[type="checkbox"], .fields input[type="radio"] { width: auto; padding: 0; accent-color: var(--accent, #b3263c); }
.fields label.check, .fields label:has(> input[type="checkbox"]) { display: flex; align-items: center; gap: 8px; color: var(--ink); }

/* Listing pages (calculators, guidelines) */
.listing h2 { margin-top: 36px; }
.li { padding: 10px 0; border-bottom: 1px solid var(--rule); }
.li-t { font-weight: 500; }
.li-n { font-size: 14px; color: var(--muted); margin: 2px 0 0; }
.li-n a { color: var(--muted); }

/* Board review and home */
@media (min-width: 1000px) { .wrap-wide { grid-template-columns: minmax(0, 960px); } }
.exam-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 16px; margin: 12px 0 18px; }
.exam-card { display: flex; flex-direction: column; gap: 6px; padding: 18px; border: 1px solid var(--rule); background: var(--surface); text-decoration: none; color: var(--ink); border-top: 3px solid var(--navy); }
.exam-card:hover { border-top-color: var(--crimson); }
.exam-k { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.exam-t { font-family: var(--display); font-size: 21px; font-weight: 650; color: var(--navy); line-height: 1.2; }
.exam-d { font-size: 15px; color: var(--muted); }
.exam-n { font-family: var(--mono); font-size: 13px; color: var(--teal); margin-top: auto; }
ul.cols { columns: 2 260px; column-gap: 32px; padding-left: 18px; margin: 6px 0 14px; }
ul.cols li { break-inside: avoid; margin-bottom: 4px; }

.home-in { max-width: 1180px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.home-hero { padding-block: 56px 40px; border-bottom: 1px solid var(--rule); background: var(--surface); }
.home-hero h1 { font-size: clamp(36px, 6vw, 58px); margin-bottom: 14px; }
.home-dek { font-size: 20px; color: var(--muted); max-width: 60ch; }
.home-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.btn-p, .btn-s { display: inline-block; padding: 11px 20px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1px solid var(--navy); }
.btn-p { background: var(--navy); color: var(--surface); }
.btn-s { color: var(--navy); background: transparent; }
.home-band { padding-block: 36px 40px; }
.home-band.alt { background: var(--tint); }
.home-band h2 { margin-top: 0; }
.home-sub { color: var(--muted); }
.subj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); gap: 22px 32px; margin-top: 12px; }
.subj h3 { margin: 0 0 6px; font-family: var(--display); font-size: 18px; }
.subj h3 a { color: var(--navy); text-decoration: none; }
.subj ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; font-size: 15.5px; }
/* Long society and DOI strings in citations wrap on narrow screens */
.refs li, .li-t, .li-n, figcaption, .cap { overflow-wrap: anywhere; }
.out { grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr)); }
.out div { min-width: 0; }
.out strong { overflow-wrap: anywhere; }
@media (max-width: 480px) { .out strong { font-size: 20px; } }
/* Checkbox labels: box at left, text wraps as one block (labels may contain italics) */
.fields label.check, .fields label:has(> input[type="checkbox"]) { display: block; position: relative; padding-left: 26px; color: var(--ink); font-size: 14px; }
.fields label.check input, .fields label:has(> input[type="checkbox"]) > input[type="checkbox"] { position: absolute; left: 0; top: 3px; width: auto; margin: 0; }
.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 170px), 1fr)); gap: 22px; margin-top: 14px; }
.book-card { display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--ink); }
.book-card img { width: 100%; max-width: 170px; height: auto; border: 1px solid var(--rule); }
.book-t { font-family: var(--display); font-weight: 650; font-size: 16px; line-height: 1.25; color: var(--navy); }
.book-card:hover .book-t { color: var(--crimson); }
.book-d { font-size: 14px; color: var(--muted); }
.book-f { font-size: 13px; color: var(--muted); }
footer .foot-links { margin-top: 6px; }
footer .foot-links a { color: inherit; }
.legal-page p { max-width: 70ch; }