/*****************************************************
PAGE HEADER — campus-history
Full-viewport hero header with photo image, title/subtitle,
caption stripe, and prev/next essay navigation arrows.

Based on xanthan page-header.css; filters removed since
campus-history uses photographs at full fidelity.
*****************************************************/


/* =====================================================
   COLOR VARIABLES
   ===================================================== */

.page-header {
  --header-bg: #120f0d;
  --header-grid-line: rgba(255, 250, 240, 1);
  --header-subtitle: rgba(255, 250, 240, 0.86);
  /* UNM chrome height from active style definitions: .navbar-unm 40px + #header 44px. */
  --unm-header-offset: 84px;
}


/* =====================================================
   BASE STRUCTURE
   ===================================================== */

/* Bootstrap 3 (UNM webcore) has .page-header { margin: 44px 0 22px; border-bottom }
   which loads after us and would add a 22px gap below and 44px above the hero.
   Override it explicitly. */
.page-header {
  position: relative;
  width: 100%;
  height: calc(100vh - var(--unm-header-offset));
  min-height: 34rem;
  overflow: hidden;
  background: var(--header-bg);
  margin: 0 !important;
  padding-bottom: 0 !important;
  border-bottom: none !important;
}

/* Photo image layer */
.page-header-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  /* No filter — campus-history displays photos as-is, slightly darkened */
  filter: brightness(0.66) saturate(1.08) contrast(1.04);
  opacity: 1;
}

/* Subtle grid overlay for visual texture */
.page-header-grid {
  position: absolute;
  inset: 0;
  opacity: 0.055;
  background-image:
    linear-gradient(var(--header-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--header-grid-line) 1px, transparent 1px);
  background-size: 4.75rem 4.75rem;
}

.page-header--hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 5;
  background:
    linear-gradient(105deg, rgba(0, 0, 0, 0.72) 0%, rgba(0, 0, 0, 0.32) 42%, rgba(0, 0, 0, 0.08) 70%),
    radial-gradient(circle at 85% 18%, rgba(255, 198, 0, 0.24), transparent 24rem);
  pointer-events: none;
}


/* =====================================================
   TYPOGRAPHY
   ===================================================== */

.page-header h1 {
  font-family: var(--font-display, Georgia, serif);
  font-size: clamp(2.2rem, 6.4vw, 6rem);
  font-weight: 700;
  color: #fffaf0;
  line-height: 0.95;
  margin-bottom: 1rem;
  margin-top: 0;
  text-shadow:
    0 1px 4px rgba(0, 0, 0, 0.7),
    0 0 30px rgba(0, 0, 0, 0.4);
}

.page-header p {
  font-family: var(--font-serif, Georgia, serif);
  font-size: clamp(1.2rem, 2.2vw, 1.7rem);
  color: var(--header-subtitle);
  line-height: 1.45;
  font-weight: 400;
  margin-bottom: 0;
  max-width: 560px;
  text-shadow:
    0 1px 4px rgba(0, 0, 0, 0.8),
    0 0 28px rgba(0, 0, 0, 0.5);
}


/* =====================================================
   HERO TIER
   ===================================================== */

.page-header--hero {
  display: flex;
  align-items: center;
  padding-bottom: 12vh;
}

/* Top scrim to protect nav legibility on bright images */
.page-header--hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 140px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent);
  z-index: 6;
  pointer-events: none;
}

/* Title/subtitle text block */
.page-header-content {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  width: min(64rem, calc(100% - 3rem));
  padding: 3rem 5rem;
  margin-left: 2rem;
}

.page-header-eyebrow {
  width: max-content;
  margin-bottom: 1.2rem;
  padding-top: 0.45rem;
  border-top: 5px solid var(--unm-high-noon);
  font-family: var(--font-body, sans-serif);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1;
  color: #fffaf0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}


/* =====================================================
   CAPTION STRIPE
   Describes what the image shows. Sits at the bottom
   of the header with a gradient scrim behind it.
   ===================================================== */

.page-header-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  padding: 2rem 2rem 0.75rem;
  background: linear-gradient(to top, rgba(0,0,0,0.70) 0%, transparent 100%);
  font-family: var(--font-mono, monospace);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.85);
  text-align: right;
  pointer-events: none;
}


/* =====================================================
   PREV/NEXT ESSAY ARROWS
   ===================================================== */

.header-arrow {
  position: absolute;
  top: 1.25rem;
  z-index: 20;
  font-size: 1.15rem;
  color: #fffaf0;
  background: rgba(23, 20, 18, 0.34);
  padding: 0.42rem 0.58rem;
  border: 1px solid rgba(255, 250, 240, 0.5);
  border-radius: 0;
  text-decoration: none;
  opacity: 0.72;
  transition:
    background 0.2s,
    border-color 0.2s,
    opacity 0.2s;
  line-height: 1;
}

.header-arrow-left  { left: 1.25rem; }
.header-arrow-right { right: 1.25rem; }

.header-arrow:hover {
  background: var(--unm-cherry);
  border-color: var(--unm-cherry);
  color: #fffaf0;
  opacity: 1;
  text-decoration: none;
}


/* =====================================================
   LEGACY JUMBOTRON (essay-header.html / jumbotron.html)
   Used by unm-base.html layout — predates the .page-header system.
   ===================================================== */

.xan-jumbotron {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.xan-jumbotron h1,
.xan-jumbotron p {
  position: relative;
  z-index: 2;
  color: #fff;
  text-align: right;
}

.xan-jumbotron h1 {
  font-size: 4rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0;
}

.page-header-stripe {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: auto;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  text-align: right;
  justify-content: flex-end;
  padding-right: 2rem;
}


/* =====================================================
   GAP BELOW HEADER
   ===================================================== */

.page-header ~ .container {
  margin-top: 2.5rem;
}


/* =====================================================
   MOBILE
   ===================================================== */

@media (max-width: 768px) {
  .page-header-content {
    padding: 2rem 1.5rem;
    margin-left: 0;
  }

  .header-arrow {
    font-size: 1.6rem;
    padding: 0.3em 0.5em;
  }
}