/* =============================================================
   layout.css
   Body reset, course shell, header, session nav, content, footer.
   ============================================================= */

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

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--bpc-font-body);
  font-size: var(--bpc-text-base);
  line-height: var(--bpc-leading-body);
  color: var(--bpc-color-text);
  background: var(--bpc-color-ivory);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, video, iframe { max-width: 100%; }

a {
  color: var(--bpc-color-navy);
  text-decoration-color: var(--bpc-color-gold-hairline);
  text-underline-offset: 0.18em;
  transition: color var(--bpc-transition-base);
}

a:hover {
  color: var(--bpc-color-gold);
}

:focus-visible {
  outline: 2px solid var(--bpc-color-focus);
  outline-offset: 3px;
  border-radius: var(--bpc-radius-sm);
}

/* ---------- Course shell ---------- */
.bpc-course-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bpc-color-ivory);
}

/* ---------- Header ---------- */
.bpc-course-header {
  background: var(--bpc-color-navy);
  color: var(--bpc-color-ivory);
  border-bottom: 1px solid var(--bpc-color-gold-muted);
}

.bpc-course-header-inner {
  width: 100%;
  max-width: var(--bpc-container-width);
  margin: 0 auto;
  padding: var(--bpc-space-6) var(--bpc-space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--bpc-space-6);
  flex-wrap: wrap;
}

.bpc-course-brand {
  display: flex;
  flex-direction: column;
  gap: var(--bpc-space-1);
  min-width: 0;
}

.bpc-course-brand-mark {
  font-family: var(--bpc-font-ui);
  font-size: var(--bpc-text-xs);
  letter-spacing: var(--bpc-tracking-label);
  text-transform: uppercase;
  color: var(--bpc-color-gold);
}

.bpc-course-brand-title {
  font-family: var(--bpc-font-heading);
  font-size: var(--bpc-text-md);
  letter-spacing: var(--bpc-tracking-heading);
  font-weight: 400;
  margin: 0;
  color: var(--bpc-color-ivory);
}

.bpc-course-meta {
  font-family: var(--bpc-font-ui);
  font-size: var(--bpc-text-xs);
  letter-spacing: var(--bpc-tracking-label);
  text-transform: uppercase;
  color: var(--bpc-color-gold);
}

/* ---------- Session navigation rail ---------- */
.bpc-session-nav {
  background: var(--bpc-color-navy-soft);
  border-bottom: 1px solid var(--bpc-color-gold-muted);
}

.bpc-session-nav-inner {
  width: 100%;
  max-width: var(--bpc-container-width);
  margin: 0 auto;
  padding: var(--bpc-space-4) var(--bpc-space-8);
  display: flex;
  align-items: center;
  gap: var(--bpc-space-6);
  flex-wrap: wrap;
}

.bpc-session-nav-title {
  font-family: var(--bpc-font-heading);
  font-size: var(--bpc-text-base);
  font-weight: 400;
  color: var(--bpc-color-ivory);
  margin: 0;
  letter-spacing: var(--bpc-tracking-heading);
}

.bpc-progress-rail {
  flex: 1;
  min-width: 240px;
  display: flex;
  align-items: center;
  gap: var(--bpc-space-3);
}

/* Session rail.
   Single component, two modes via [data-bpc-mode]:
     - "preview" : foundation/build state (gold "Preview Mode" tag)
     - "full"    : production state (session label + percent complete) */
.bpc-session-rail {
  display: inline-flex;
  align-items: center;
  gap: var(--bpc-space-3);
  padding: var(--bpc-space-2) var(--bpc-space-4);
  border: 1px solid var(--bpc-color-border-on-navy);
  border-radius: var(--bpc-radius-sm);
  background: rgba(248, 245, 239, 0.04);
  align-self: center;
  max-width: max-content;
}

.bpc-session-rail-tag {
  font-family: var(--bpc-font-ui);
  font-size: var(--bpc-text-xs);
  letter-spacing: var(--bpc-tracking-label);
  text-transform: uppercase;
  color: var(--bpc-color-gold);
  font-weight: 600;
}

.bpc-session-rail-divider {
  display: inline-block;
  width: 1px;
  height: 12px;
  background: var(--bpc-color-gold-hairline);
}

.bpc-session-rail-meta {
  font-family: var(--bpc-font-ui);
  font-size: var(--bpc-text-xs);
  letter-spacing: var(--bpc-tracking-label);
  text-transform: uppercase;
  color: var(--bpc-color-ivory);
}

/* Subtle background tint for full mode so it does not feel identical
   to the preview state. Preview retains the warmer ivory tint. */
.bpc-session-rail[data-bpc-mode="full"] {
  background: rgba(212, 175, 55, 0.06);
}

/* ---------- Main content ---------- */
.bpc-content-main {
  flex: 1;
  width: 100%;
  max-width: var(--bpc-container-width);
  margin: 0 auto;
  padding: var(--bpc-space-12) var(--bpc-space-8) var(--bpc-space-16);
}

/* ---------- Footer ---------- */
.bpc-course-footer {
  background: var(--bpc-color-navy-darker);
  color: var(--bpc-color-ivory);
  border-top: 1px solid var(--bpc-color-gold-muted);
}

.bpc-course-footer-inner {
  width: 100%;
  max-width: var(--bpc-container-width);
  margin: 0 auto;
  padding: var(--bpc-space-6) var(--bpc-space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--bpc-space-4);
  flex-wrap: wrap;
  font-family: var(--bpc-font-ui);
  font-size: var(--bpc-text-xs);
  letter-spacing: var(--bpc-tracking-label);
  text-transform: uppercase;
  color: var(--bpc-color-gold);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .bpc-course-header-inner,
  .bpc-session-nav-inner,
  .bpc-content-main,
  .bpc-course-footer-inner {
    padding-left: var(--bpc-space-5);
    padding-right: var(--bpc-space-5);
  }

  .bpc-content-main {
    padding-top: var(--bpc-space-8);
    padding-bottom: var(--bpc-space-12);
  }

  .bpc-course-brand-title {
    font-size: var(--bpc-text-base);
  }
}