/* ==========================================================================
   CMMCI Workshop — site styles
   Layered on top of Bootstrap 5.3 (CDN). Bootstrap handles grid, navbar,
   and utilities; this file owns the brand palette, type scale, and the
   handful of custom components (hero, fact strip, cards, agenda rows).

   Color tokens are checked against WCAG 2.1 AA (4.5:1 body, 3:1 large/UI).
   Contrast ratios noted inline — re-check before changing any value.
   ========================================================================== */

:root {
  /* Brand palette */
  --cm-ink:        #10243a;  /* 15.1:1 on white — headings, dark surfaces   */
  --cm-navy:       #1b4b73;  /*  9.2:1 on white — primary actions, links    */
  --cm-navy-dark:  #14395a;  /* hover state for primary                     */
  --cm-copper:     #a44a1f;  /*  5.9:1 on white — accent, rules, eyebrows   */
  --cm-copper-dk:  #833b18;  /* hover state for accent                      */
  --cm-teal:       #0f6e6e;  /*  6.0:1 on white — secondary accent          */
  --cm-muted:      #4a5a6a;  /*  7.1:1 on white — secondary body copy       */
  --cm-body:       #22303d;  /* 12.4:1 on white — body copy                 */

  /* Surfaces */
  --cm-surface:    #f5f7fa;
  --cm-surface-2:  #eaeff5;
  --cm-border:     #d7dee6;
  --cm-white:      #ffffff;

  /* Scale */
  --cm-radius:     10px;
  --cm-shadow:     0 1px 2px rgba(16, 36, 58, .06), 0 8px 24px rgba(16, 36, 58, .07);
  --cm-maxw:       68rem;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

body {
  color: var(--cm-body);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--cm-ink);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 1.3rem + 1.3vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 1.1rem + 0.5vw, 1.4rem); }

a {
  color: var(--cm-navy);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.075em;
}

a:hover, a:focus { color: var(--cm-navy-dark); }

/* A single, consistent, always-visible focus ring. Never remove this without
   supplying an equivalent — keyboard users rely on it (WCAG 2.4.7). */
:focus-visible {
  outline: 3px solid var(--cm-copper);
  outline-offset: 2px;
  border-radius: 3px;
}

/* Skip link — visually hidden until focused. */
.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -4rem;
  z-index: 1100;
  padding: 0.65rem 1rem;
  background: var(--cm-ink);
  color: var(--cm-white);
  font-weight: 600;
  border-radius: 0 0 var(--cm-radius) var(--cm-radius);
  transition: top .15s ease-in-out;
}

.skip-link:focus { top: 0; color: var(--cm-white); }

/* --------------------------------------------------------------------------
   Reusable bits
   -------------------------------------------------------------------------- */

.section       { padding: clamp(3rem, 6vw, 5rem) 0; }
.section--tint { background: var(--cm-surface); }
.section--ink  { background: var(--cm-ink); color: #dfe7ef; }
.section--ink h2, .section--ink h3 { color: var(--cm-white); }

.measure { max-width: 62ch; }

/* Small uppercase label that sits above a heading. */
.eyebrow {
  display: block;
  margin-bottom: 0.6rem;
  color: var(--cm-copper);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section--ink .eyebrow { color: #e8a97e; } /* 6.4:1 on --cm-ink */

/* Short copper rule used to open a section. */
.rule-accent {
  width: 3.5rem;
  height: 4px;
  margin-bottom: 1.25rem;
  background: var(--cm-copper);
  border-radius: 2px;
}

.lead-copy {
  font-size: 1.15rem;
  color: var(--cm-muted);
}

.section--ink .lead-copy { color: #c6d3e0; } /* 9.7:1 on --cm-ink */

/* Buttons — built on Bootstrap's CSS-variable API so we inherit its sizing,
   focus, and disabled behavior while supplying brand color. */
.btn-cm {
  --bs-btn-color: #fff;
  --bs-btn-bg: var(--cm-navy);
  --bs-btn-border-color: var(--cm-navy);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: var(--cm-navy-dark);
  --bs-btn-hover-border-color: var(--cm-navy-dark);
  --bs-btn-active-bg: var(--cm-navy-dark);
  --bs-btn-active-border-color: var(--cm-navy-dark);
  --bs-btn-font-weight: 600;
}

.btn-cm-accent {
  --bs-btn-color: #fff;
  --bs-btn-bg: var(--cm-copper);
  --bs-btn-border-color: var(--cm-copper);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: var(--cm-copper-dk);
  --bs-btn-hover-border-color: var(--cm-copper-dk);
  --bs-btn-active-bg: var(--cm-copper-dk);
  --bs-btn-font-weight: 600;
}

/* Outline button for use on dark backgrounds (hero, CTA band). */
.btn-cm-onDark {
  --bs-btn-color: #fff;
  --bs-btn-bg: transparent;
  --bs-btn-border-color: rgba(255, 255, 255, .7);
  --bs-btn-hover-color: var(--cm-ink);
  --bs-btn-hover-bg: #fff;
  --bs-btn-hover-border-color: #fff;
  --bs-btn-font-weight: 600;
}

/* --------------------------------------------------------------------------
   Header / navigation
   -------------------------------------------------------------------------- */

.site-header {
  border-bottom: 1px solid var(--cm-border);
  background: var(--cm-white);
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-mark__glyph {
  flex: 0 0 auto;
  width: 2.25rem;
  height: 2.25rem;
}

.brand-mark__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-mark__abbr {
  color: var(--cm-ink);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand-mark__sub {
  color: var(--cm-muted);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.site-nav .nav-link {
  color: var(--cm-body);
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
}

.site-nav .nav-link:hover { color: var(--cm-navy); background: var(--cm-surface); }

/* Current page. The copper underline is decorative — aria-current on the link
   is what actually conveys this to assistive tech (WCAG 1.4.1). */
.site-nav .nav-link[aria-current="page"] {
  color: var(--cm-navy);
  box-shadow: inset 0 -3px 0 var(--cm-copper);
  border-radius: 6px 6px 0 0;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  isolation: isolate;
  padding: clamp(3.5rem, 9vw, 7rem) 0;
  background-color: var(--cm-ink);
  color: #fff;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Overlay does the accessibility work: it guarantees hero text clears 4.5:1
   no matter which photo sits behind it. Do not lighten past .70 alpha. */
.hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(16, 36, 58, .70) 0%, rgba(16, 36, 58, .86) 100%),
    linear-gradient(90deg, rgba(16, 36, 58, .55) 0%, rgba(16, 36, 58, .15) 100%);
}

.hero h1 { color: #fff; max-width: 20ch; }

.hero__eyebrow { color: #f0b98f; } /* 7.2:1 over the scrimmed backdrop */

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 1.05rem;
  color: #e4ebf2;
}

.hero__meta li { display: flex; align-items: flex-start; gap: 0.55rem; }
.hero__meta svg { flex: 0 0 auto; margin-top: 0.28em; }

/* Small page banner used on interior pages instead of the full hero. */
.page-head {
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  background: var(--cm-ink);
  color: #dfe7ef;
}

.page-head h1 { color: #fff; }
.page-head .lead-copy { color: #c6d3e0; }

/* --------------------------------------------------------------------------
   Fact strip
   -------------------------------------------------------------------------- */

.fact-strip {
  background: var(--cm-surface);
  border-bottom: 1px solid var(--cm-border);
}

.fact {
  display: flex;
  gap: 0.85rem;
  padding: 1.5rem 0;
}

.fact__icon { flex: 0 0 auto; color: var(--cm-teal); margin-top: 0.15rem; }
.fact__label {
  display: block;
  color: var(--cm-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.fact__value { color: var(--cm-ink); font-weight: 600; }

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.cm-card {
  height: 100%;
  padding: 1.6rem;
  background: var(--cm-white);
  border: 1px solid var(--cm-border);
  border-radius: var(--cm-radius);
  box-shadow: var(--cm-shadow);
}

.cm-card__num {
  display: inline-block;
  margin-bottom: 0.75rem;
  color: var(--cm-copper);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.cm-card h3 { margin-bottom: 0.5rem; }
.cm-card p:last-child { margin-bottom: 0; }

/* Person card (organizers). */
.person {
  height: 100%;
  padding: 1.4rem;
  background: var(--cm-white);
  border: 1px solid var(--cm-border);
  border-top: 4px solid var(--cm-teal);
  border-radius: var(--cm-radius);
}

.person__name { font-size: 1.1rem; margin-bottom: 0.2rem; }
.person__role { color: var(--cm-copper); font-weight: 600; font-size: 0.85rem;
                letter-spacing: 0.06em; text-transform: uppercase; }
.person__affil { color: var(--cm-muted); margin-bottom: 0; }

/* --------------------------------------------------------------------------
   Agenda
   -------------------------------------------------------------------------- */

.agenda-day {
  border: 1px solid var(--cm-border);
  border-radius: var(--cm-radius);
  overflow: hidden;
  background: var(--cm-white);
}

.agenda-day__head {
  padding: 1rem 1.35rem;
  background: var(--cm-ink);
  color: #fff;
}

.agenda-day__head h2 { color: #fff; margin: 0; font-size: 1.35rem; }
.agenda-day__date { color: #c6d3e0; font-size: 0.95rem; }

.agenda-row {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 0 1.5rem;
  padding: 1.15rem 1.35rem;
  border-top: 1px solid var(--cm-border);
}

.agenda-row:first-of-type { border-top: none; }

.agenda-row__time {
  color: var(--cm-navy);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.agenda-row__title { font-size: 1.05rem; font-weight: 700; color: var(--cm-ink);
                     margin-bottom: 0.15rem; }
.agenda-row__desc  { color: var(--cm-muted); margin-bottom: 0; font-size: 0.97rem; }

@media (max-width: 575.98px) {
  .agenda-row { grid-template-columns: 1fr; gap: 0.3rem; }
}

/* Badge marking unconfirmed content. Uses text, not color alone. */
.badge-tbd {
  display: inline-block;
  padding: 0.15em 0.6em;
  background: var(--cm-surface-2);
  border: 1px solid var(--cm-border);
  border-radius: 999px;
  color: var(--cm-muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: middle;
}

/* --------------------------------------------------------------------------
   Callouts, timeline, footer
   -------------------------------------------------------------------------- */

.callout {
  padding: 1.35rem 1.5rem;
  background: var(--cm-surface);
  border-left: 4px solid var(--cm-teal);
  border-radius: 0 var(--cm-radius) var(--cm-radius) 0;
}

.callout h3 { font-size: 1.1rem; }
.callout p:last-child { margin-bottom: 0; }

.timeline { list-style: none; margin: 0; padding: 0; }

.timeline li {
  position: relative;
  padding: 0 0 1.6rem 2rem;
  border-left: 2px solid var(--cm-border);
}

.timeline li:last-child { border-left-color: transparent; padding-bottom: 0; }

.timeline li::before {
  content: "";
  position: absolute;
  left: -0.44rem;
  top: 0.35rem;
  width: 0.8rem;
  height: 0.8rem;
  background: var(--cm-copper);
  border-radius: 50%;
}

.timeline__date { display: block; color: var(--cm-copper); font-weight: 700;
                  font-size: 0.85rem; letter-spacing: 0.06em; text-transform: uppercase; }
.timeline__what { font-weight: 600; color: var(--cm-ink); }

.site-footer {
  padding: 3rem 0 2rem;
  background: var(--cm-ink);
  color: #c6d3e0;
  font-size: 0.95rem;
}

.site-footer h2 { color: #fff; font-size: 1.05rem; margin-bottom: 0.75rem; }
.site-footer a { color: #b9d3ee; } /* 8.1:1 on --cm-ink */
.site-footer a:hover, .site-footer a:focus { color: #fff; }

.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 0.4rem; }

.footer-bottom {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, .14);
  color: #a9bccf; /* 6.5:1 on --cm-ink */
  font-size: 0.875rem;
}

/* --------------------------------------------------------------------------
   Motion & print
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .site-header, .site-footer, .skip-link, .hero__bg, .hero__scrim { display: none !important; }
  .hero, .page-head { background: none; color: #000; padding: 1rem 0; }
  .hero h1, .page-head h1 { color: #000; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.85em; }
}