/* ═══════ SHARED STYLES ═══════
   Common CSS for all pages of the Clinical AI Policy site.
   Uses tokens.css for all design tokens (colors, fonts, spacing).
   ═══════════════════════════════ */

:root {
  --nav-width: 260px;
  --comment-width: 320px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; overflow-x: hidden; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-surface-alt);
  line-height: var(--leading-relaxed);
  font-size: var(--text-base);
  -webkit-font-smoothing: antialiased;
}

/* ── LAYOUT ── */
.page {
  display: flex;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

/* Content area: holds main + right rail */
.content-area {
  display: flex;
  flex: 1;
  max-width: calc(var(--width-content) + var(--space-lg) + var(--comment-width));
  min-height: 100vh;
  align-items: flex-start;
}

/* ── LEFT NAV ── */
.nav {
  position: sticky; top: 0;
  width: var(--nav-width);
  min-width: var(--nav-width);
  height: 100vh;
  overflow-y: auto; background: var(--color-primary);
  color: var(--color-text-inverse); padding: 28px 0 40px;
  z-index: 100;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.25) transparent;
  flex-shrink: 0;
}
.nav::-webkit-scrollbar { width: 5px; }
.nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,.25); border-radius: 3px; }

.nav-title {
  font-family: var(--font-ui);
  font-size: var(--text-sm); font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider); text-transform: uppercase;
  padding: 0 var(--space-md) var(--space-5); color: var(--color-accent);
  border-bottom: 1px solid rgba(255,255,255,.12);
  margin-bottom: var(--space-3);
}
.nav a {
  font-family: var(--font-ui);
  display: block; padding: 7px var(--space-md);
  color: rgba(255,255,255,.72); text-decoration: none;
  font-size: 13.5px; transition: all .15s;
  border-left: 3px solid transparent;
}
.nav a:hover, .nav a.active {
  color: var(--color-text-inverse); background: rgba(255,255,255,.07);
  border-left-color: var(--color-accent);
}
.nav a.sub { padding-left: 38px; font-size: 12.5px; }
.nav a.nav-quiz-link {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,.15);
  border-left-color: var(--color-accent);
  font-weight: var(--weight-semibold);
  font-size: 13.5px;
  color: var(--color-accent);
  letter-spacing: .3px;
}
.nav a.nav-quiz-link:hover {
  color: var(--color-text-inverse);
  background: rgba(255,255,255,.07);
}

/* ── MAIN CONTENT ── */
.main {
  flex: 1; padding: var(--space-10) 56px var(--space-20);
  max-width: var(--width-content);
  position: relative;
  overflow-wrap: break-word;
  word-wrap: break-word;
  /* Card treatment — white surface on gray page */
  background: var(--color-surface);
  border-radius: 0 0 var(--card-radius) var(--card-radius);
  border-top: 3px solid var(--color-accent);
  box-shadow: var(--card-shadow);
}

/* ── TYPOGRAPHY ── */
h1 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl); font-weight: var(--weight-bold); color: var(--color-primary);
  margin-bottom: var(--space-2); line-height: var(--leading-tight); text-align: center;
}
.subtitle {
  font-family: var(--font-ui);
  color: var(--color-text-muted); font-size: var(--text-sm); margin-bottom: var(--space-lg);
}

h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl); font-weight: var(--weight-bold); color: var(--color-primary);
  margin: var(--space-xl) 0 var(--space-sm); padding-top: 0;
  border-top: none;
}
h2::before {
  content: '';
  display: block;
  width: 48px;
  height: 2px;
  background: var(--color-accent);
  margin-bottom: var(--space-3);
}
h2:first-child { margin-top: 0; }
h2:first-child::before { display: none; }
h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl); font-weight: var(--weight-semibold); color: var(--color-primary-hover);
  margin: var(--space-lg) 0 var(--space-3);
}

p { margin-bottom: var(--space-4); }

/* ── SECTION WRAPPER ── */
.section {
  position: relative;
  padding: var(--space-1) 0;
}
.section + .section { margin-top: var(--space-xs); }

/* ── OPTION BLOCKS ── */
.option {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-sm);
  margin: var(--space-xs) 0;
  box-shadow: var(--shadow-sm);
}
.option strong { color: var(--color-primary-hover); }

/* ── TABLES ── */
table {
  width: 100%; border-collapse: collapse;
  margin: var(--space-sm) 0 var(--space-5); font-size: var(--text-sm);
}
th {
  font-family: var(--font-ui);
  background: var(--color-primary); color: var(--color-text-inverse);
  text-align: left; padding: var(--space-3) var(--space-4); font-weight: var(--weight-semibold);
  font-size: var(--text-xs);
}
td {
  padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
tr:nth-child(even) td { background: var(--color-surface-alt); }

/* ── HR ── */
hr {
  border: none; border-top: 1px solid var(--color-border);
  margin: var(--space-10) 0;
}

/* ── LISTS ── */
ul, ol { margin: var(--space-xs) 0 var(--space-4) 22px; }
li { margin-bottom: var(--space-2); }

/* ── COPY BUTTON ── */
.copy-btn {
  position: absolute; top: 0; right: -36px;
  background: none; border: none; cursor: pointer;
  opacity: 0; transition: opacity .15s;
  padding: 4px; color: var(--color-text-faint);
}
.section:hover .copy-btn { opacity: .55; }
.copy-btn:hover { opacity: 1 !important; color: var(--color-primary-hover); }
.copy-btn svg { width: 18px; height: 18px; }
.copy-btn.copied { color: var(--color-accent); }
.copy-btn:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Toast */
.toast {
  font-family: var(--font-ui);
  position: fixed; bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-primary); color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-md); border-radius: var(--radius-md);
  font-size: var(--text-xs); font-weight: var(--weight-medium);
  opacity: 0; transition: all .25s; z-index: var(--z-toast);
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── CROSSLINKS ── */
a.xref {
  color: var(--color-primary-hover); text-decoration: none;
  border-bottom: 1px dashed var(--color-primary-hover);
  transition: color .15s;
}
a.xref:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  .nav {
    /* On mobile, revert to fixed overlay so it slides over content */
    position: fixed; left: 0; top: 0;
    width: 0; min-width: 0; padding: 0; overflow: hidden;
    transition: width .25s ease, padding .25s ease;
  }
  .nav.open { width: 260px; padding: 28px 0 40px; }
  .nav-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.35); z-index: 99;
    transition: opacity .25s;
  }
  .nav-overlay.visible { display: block; }
  .page { max-width: 100%; }
  .content-area { max-width: 100%; }
  .main {
    padding: var(--space-md) var(--space-sm) var(--space-16);
    max-width: 100%; overflow-x: hidden;
    border-radius: 0;
    box-shadow: none;
    border-top: none;
  }
  .hamburger { display: flex !important; }
  .copy-btn { display: none; }
}

/* Hamburger */
.hamburger {
  display: none !important;
  position: fixed; top: 12px; left: 12px;
  z-index: 200; background: var(--color-primary);
  border: none; border-radius: var(--radius-md); padding: 8px 10px;
  cursor: pointer; color: var(--color-text-inverse);
  align-items: center; justify-content: center;
}
.hamburger svg { width: 22px; height: 22px; }

/* ── FOCUS STYLES ── */
.nav a:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: -2px;
}
.hamburger:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
a.xref:focus-visible {
  outline: 2px solid var(--color-primary-hover);
  outline-offset: 1px;
}