/* Robotic Coronary Bypass at Columbia. Tokens first, then layout, then components.
   Palette and type follow columbiasurgery.org (Libre Franklin, Columbia blue).
   Every colour lives in the three token blocks below; nothing else may name one. */

:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f4f6f9;
  --surface-2: #e8edf4;
  --border: #d3dae3;
  --text: #1e2a36;
  --text-muted: #55677a;
  --accent: #13407b;
  --accent-hover: #072143;
  --accent-soft: #e4edf7;
  --on-accent: #ffffff;
  --link: #0071b3;
  --font-sans: "Libre Franklin", "Franklin Gothic Medium", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --nav-h: 52px;
  --tabs-h: 44px;
  --bar-h: 56px;
  font-feature-settings: "tnum";
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0b1829;
    --surface: #132539;
    --surface-2: #1b324c;
    --border: #2b4361;
    --text: #e7eef7;
    --text-muted: #a8b9cc;
    --accent: #8ec2ee;
    --accent-hover: #b9dcf8;
    --accent-soft: #1b324c;
    --on-accent: #0b1829;
    --link: #9dcbf3;
    }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1829;
  --surface: #132539;
  --surface-2: #1b324c;
  --border: #2b4361;
  --text: #e7eef7;
  --text-muted: #a8b9cc;
  --accent: #8ec2ee;
  --accent-hover: #b9dcf8;
  --accent-soft: #1b324c;
  --on-accent: #0b1829;
  --link: #9dcbf3;
}

/* ---------- base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--nav-h) + var(--tabs-h)); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
}

[hidden] { display: none !important; }

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent-hover); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.masthead :focus-visible { outline-color: var(--on-accent); }

button, .button { font: inherit; touch-action: manipulation; }

h1, h2, h3 { margin: 0 0 0.4em; line-height: 1.15; color: var(--accent); letter-spacing: -0.01em; }
h1 { font-size: clamp(1.9rem, 1.2rem + 2.8vw, 3rem); font-weight: 800; line-height: 1.05; }
h2 { font-size: clamp(1.45rem, 1.1rem + 1.4vw, 1.9rem); font-weight: 800; }
h3 { font-size: 1.0625rem; font-weight: 600; color: var(--text); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.25em; }
li { margin-bottom: 0.35em; }
strong { font-weight: 600; }

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 8px; top: -60px; z-index: 100;
  padding: 8px 12px; background: var(--bg); color: var(--accent); border: 2px solid var(--accent); border-radius: 4px;
}
.skip-link:focus { top: 8px; }

/* ---------- demo banner ---------- */

.demo-banner {
  margin: 0; padding: 8px 16px; text-align: center;
  font-size: 13px; font-weight: 600;
  background: var(--accent-soft); color: var(--accent);
  border-bottom: 1px solid var(--border);
}

/* ---------- masthead ---------- */

.masthead {
  position: sticky; top: 0; z-index: 20;
  height: var(--nav-h);
  background: var(--accent); color: var(--on-accent);
}
.masthead .row {
  height: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: nowrap;
}
.wordmark { color: inherit; text-decoration: none; display: flex; flex-direction: column; min-width: 0; }
.wordmark .w1 { font-size: 12px; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; line-height: 1.1; }
.wordmark .w2 { font-size: 14px; font-weight: 600; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }
.masthead .tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.role-switch {
  display: inline-flex; border: 1px solid currentColor; border-radius: 999px; padding: 2px;
}
.role-switch a {
  color: inherit; text-decoration: none; font-size: 13px; font-weight: 600;
  padding: 5px 12px; border-radius: 999px; line-height: 1.2; min-height: 28px; display: inline-flex; align-items: center;
  transition: background-color 120ms, color 120ms;
}
.role-switch a[aria-current="page"] { background: var(--on-accent); color: var(--accent); }

.icon-btn {
  width: 32px; height: 32px; padding: 0; border: 1px solid currentColor; border-radius: 6px;
  background: transparent; color: inherit; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
  position: relative;
}
.icon-btn::before { content: ""; position: absolute; inset: -6px; }
.icon-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; }

/* ---------- section tabs ---------- */

#tabs { position: sticky; top: var(--nav-h); z-index: 19; background: var(--bg); border-bottom: 1px solid var(--border); }
.tabs { display: flex; max-width: 1080px; margin: 0 auto; padding: 0 8px; overflow: hidden; }
.tab {
  flex: 0 1 auto; min-width: 0;
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--tabs-h); padding: 0 12px;
  color: var(--text-muted); font-size: 14px; font-weight: 600; text-decoration: none; white-space: nowrap;
  border-bottom: 2px solid transparent; transition: color 120ms, border-color 120ms;
}
.tab:hover { color: var(--accent); }
.tab[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }

@media (max-width: 639px) {
  #tabs {
    position: fixed; top: auto; bottom: 0; left: 0; right: 0;
    border-bottom: 0; border-top: 1px solid var(--border);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .tabs { padding: 0; }
  .tab {
    flex: 1 1 0; min-height: var(--bar-h); padding: 0 2px; font-size: 11px; line-height: 1.1;
    border-bottom: 0; border-top: 2px solid transparent;
  }
  .tab[aria-selected="true"] { border-bottom-color: transparent; border-top-color: var(--accent); }
  body[data-view="patients"] main, body[data-view="physicians"] main { padding-bottom: calc(var(--bar-h) + env(safe-area-inset-bottom) + 24px); }
}

/* ---------- layout ---------- */

main { display: block; }
.panel { max-width: 900px; margin: 0 auto; padding: 22px 16px 48px; }
.panel:focus { outline: none; }
.lede { font-size: 1.125rem; max-width: 64ch; }
.muted { color: var(--text-muted); }
.small { font-size: 0.875rem; }
.byline { font-size: 0.8125rem; color: var(--text-muted); margin-top: 6px; }
.split { display: grid; gap: 20px; }

@media (min-width: 640px) {
  .panel { padding: 28px 24px 56px; }
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
}
@media (min-width: 1024px) {
  .panel { padding: 36px 24px 72px; }
  .split.wide { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 40px; }
}

/* ---------- landing ---------- */

.home { max-width: 1080px; margin: 0 auto; padding: 28px 16px 56px; display: grid; gap: 28px; }
.home .lede { font-size: 1.125rem; }
.doors { display: grid; gap: 12px; margin: 4px 0 8px; }
.door {
  display: block; text-decoration: none; color: var(--text);
  border: 1px solid var(--border); border-radius: 6px; padding: 16px 44px 16px 16px; position: relative;
  transition: border-color 120ms, background-color 120ms;
}
.door:hover, .door:focus-visible { border-color: var(--accent); background: var(--surface); color: var(--text); }
.door h2 { font-size: 1.25rem; margin-bottom: 4px; }
.door p { margin: 0; color: var(--text-muted); font-size: 0.9375rem; }
.door::after {
  content: ""; position: absolute; right: 18px; top: 50%; width: 10px; height: 10px;
  border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: translateY(-50%) rotate(-45deg);
}
.contact-line { font-size: 0.9375rem; color: var(--text-muted); }
.contact-line b { color: var(--text); font-weight: 600; }

@media (min-width: 1024px) {
  .home { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 48px; padding: 48px 24px 72px; align-items: center; }
  .doors { grid-template-columns: 1fr 1fr; }
}

/* ---------- diagram ---------- */

.figure { margin: 0; }
.figure svg { width: 100%; height: auto; display: block; }
.figure figcaption { font-size: 0.8125rem; color: var(--text-muted); margin-top: 8px; }
.d-body { fill: var(--surface-2); stroke: var(--border); stroke-width: 1.2; }
.d-rib { stroke: var(--border); stroke-width: 1; fill: none; }
.d-sternum { stroke: var(--border); stroke-width: 1.4; fill: none; }
.d-cut { stroke: var(--accent); stroke-width: 3; stroke-linecap: round; fill: none; }
.d-port { fill: var(--accent); }
.d-label { fill: var(--text); font-size: 12px; font-weight: 600; }
.d-note { fill: var(--text-muted); font-size: 10.5px; }

/* ---------- source chips ---------- */

.src {
  display: inline-block; vertical-align: 1px; margin-left: 4px;
  font-size: 10.5px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; line-height: 1.5;
  padding: 0 6px; border: 1px solid var(--border); border-radius: 999px; color: var(--text-muted); text-decoration: none;
  white-space: nowrap; transition: color 120ms, border-color 120ms;
}
.src:hover, .src:focus-visible { color: var(--link); border-color: var(--link); }

/* ---------- stats ---------- */

.stats { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin: 16px 0 20px; }
.stat { border: 1px solid var(--border); border-radius: 4px; padding: 12px 14px; background: var(--bg); }
.stat b { display: block; font-size: 1.5rem; font-weight: 800; color: var(--accent); line-height: 1.1; }
.stat span { display: block; font-size: 0.8125rem; color: var(--text-muted); margin-top: 4px; }
.stat .src { margin-left: 0; margin-top: 8px; }

/* ---------- definition rows, checklists ---------- */

.rows { margin: 8px 0 20px; }
.rows > div { border-top: 1px solid var(--border); padding: 14px 0; }
.rows > div:last-child { border-bottom: 1px solid var(--border); }
.rows dt { font-weight: 600; color: var(--text); margin-bottom: 4px; }
.rows dd { margin: 0; color: var(--text); }
.rows dd p:last-child { margin-bottom: 0; }

@media (min-width: 640px) {
  .rows.two > div { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 16px; }
  .rows.two dt { margin-bottom: 0; }
}

.check { list-style: none; padding: 0; margin: 8px 0 20px; }
.check li { position: relative; padding-left: 26px; margin-bottom: 8px; }
.check li::before {
  content: ""; position: absolute; left: 2px; top: 7px; width: 8px; height: 13px;
  border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(45deg);
}

/* ---------- timeline ---------- */

.timeline { list-style: none; padding: 0; margin: 8px 0 20px; counter-reset: step; }
.timeline li { position: relative; padding: 0 0 18px 40px; border-left: 1px solid var(--border); margin: 0 0 0 12px; }
.timeline li:last-child { padding-bottom: 4px; }
.timeline li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: -13px; top: 0; width: 25px; height: 25px; border-radius: 50%;
  background: var(--accent); color: var(--on-accent); font-size: 12px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.timeline h3 { margin-bottom: 2px; }
.timeline p { margin-bottom: 0; }

/* ---------- disclosure ---------- */

details.acc { border-top: 1px solid var(--border); }
details.acc:last-of-type { border-bottom: 1px solid var(--border); }
details.acc > summary {
  cursor: pointer; list-style: none; padding: 8px 32px 8px 0; position: relative; font-weight: 600; color: var(--text);
}
details.acc > summary::-webkit-details-marker { display: none; }
details.acc > summary::after {
  content: ""; position: absolute; right: 8px; top: 14px; width: 8px; height: 8px;
  border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(45deg); transition: transform 120ms;
}
details.acc[open] > summary::after { transform: rotate(225deg); top: 18px; }
details.acc > :not(summary) { padding-right: 8px; }
details.acc:not([open]) > :not(summary) { display: none; }
details.acc > p:last-child, details.acc > ul:last-child { margin-bottom: 14px; }
@media (pointer: coarse) {
  details.acc > summary { min-height: 44px; display: flex; align-items: center; }
  details.acc > summary::after { top: 50%; margin-top: -6px; }
  details.acc[open] > summary::after { top: 50%; margin-top: -2px; }
  .role-switch { padding: 0; border-color: transparent; }
  .role-switch a { min-height: 44px; padding: 0 12px; }
}

/* ---------- calls to action, cards ---------- */

.cta {
  border: 1px solid var(--border); border-radius: 6px; padding: 16px; margin: 20px 0; background: var(--surface);
  display: grid; gap: 12px;
}
.cta .phone { font-size: 1.5rem; font-weight: 800; color: var(--accent); text-decoration: none; line-height: 1.1; }
.cta .phone:hover { color: var(--accent-hover); }
.cta p { margin: 0; }
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 18px;
  border-radius: 6px; font-weight: 600; text-decoration: none; cursor: pointer; border: 1px solid var(--accent);
  transition: background-color 120ms, color 120ms;
}
.button.primary { background: var(--accent); color: var(--on-accent); }
.button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.button.secondary { background: transparent; color: var(--accent); }
.button.secondary:hover { background: var(--accent-soft); color: var(--accent); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }

@media (min-width: 640px) {
  .cta { grid-template-columns: auto minmax(0, 1fr); align-items: center; }
  .split .cta { grid-template-columns: minmax(0, 1fr); margin-top: 0; }
}
@media (max-width: 639px) {
  .wordmark .w1 { font-size: 13px; }
  .wordmark .w2 { display: none; }
}

.card { border: 1px solid var(--border); border-radius: 6px; padding: 16px; background: var(--bg); margin: 16px 0; }
.card h3 { margin-bottom: 2px; }
.card p:last-child { margin-bottom: 0; }
.card .role { color: var(--text-muted); font-size: 0.875rem; margin-bottom: 8px; }

blockquote { margin: 0 0 1em; padding: 4px 0 4px 14px; border-left: 3px solid var(--accent); color: var(--text); }
blockquote p { margin-bottom: 4px; }
blockquote cite { font-style: normal; font-size: 0.875rem; color: var(--text-muted); }

/* ---------- tables ---------- */

.tablewrap { overflow-x: auto; margin: 8px 0 20px; }
table { border-collapse: collapse; width: 100%; font-size: 0.9375rem; }
th, td { text-align: left; vertical-align: top; padding: 10px 10px 10px 0; border-top: 1px solid var(--border); }
th { font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); font-weight: 600; border-top: 0; }
tbody tr:last-child td { border-bottom: 1px solid var(--border); }
td .where { display: block; font-size: 0.8125rem; color: var(--text-muted); }
td strong { font-weight: 600; }

@media (max-width: 639px) {
  table.stack thead { display: none; }
  table.stack tr { display: block; border-top: 1px solid var(--border); padding: 8px 0; }
  table.stack td { display: block; border: 0; padding: 2px 0; }
  table.stack tbody tr:last-child { border-bottom: 1px solid var(--border); }
  table.stack tbody tr:last-child td { border-bottom: 0; }
}

/* ---------- footer ---------- */

footer { border-top: 1px solid var(--border); margin-top: 24px; }
footer .row { max-width: 1080px; margin: 0 auto; padding: 20px 16px 28px; font-size: 0.8125rem; color: var(--text-muted); }
footer p { margin: 0 0 6px; }

/* ---------- misc ---------- */

.js #home:not(.is-active) { display: none; }
.note { border: 1px solid var(--border); border-radius: 4px; padding: 10px 12px; background: var(--surface); font-size: 0.9375rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

@media print {
  .masthead, #tabs, .skip-link, .demo-banner { display: none; }
  .js section[hidden] { display: block !important; }
}