/* ==========================================================================
   LAYOUT & RESPONSIVE GRID STYLES - REVISED & FULLY PROPORTIONAL
   Mobile-first, tablet & desktop adaptive layout
   Zero text-crushing, zero horizontal overflow
   ========================================================================== */

/* Main Container */
.container {
  width: 100%;
  max-width: var(--site-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (max-width: 640px) {
  .container {
    padding-left: 14px;
    padding-right: 14px;
  }
}

/* ==========================================================================
   TOP MASTHEAD / HEADER
   ========================================================================== */
.site-header {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1.5px solid var(--border-card);
  position: sticky;
  top: 0;
  z-index: 90;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 8px 0;
  gap: 12px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.header-logos {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-ipb-brin {
  height: 44px;
  width: auto;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-inst {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-event {
  font-family: var(--font-serif);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--accent-terracotta-dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-header-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card-tint);
  color: var(--accent-terracotta-dark);
  border: 1.5px solid rgba(221, 132, 102, 0.35);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-header-action:hover {
  background: var(--accent-terracotta);
  color: #FFFFFF;
}

/* Desktop Nav in Header */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.desktop-nav a {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.desktop-nav a:hover, .desktop-nav a.active {
  color: var(--accent-terracotta-dark);
  background: var(--accent-terracotta-soft);
}

@media (max-width: 1024px) {
  .desktop-nav {
    display: none;
  }
}

@media (max-width: 640px) {
  .brand-inst {
    font-size: 9.5px;
  }
  .brand-event {
    font-size: 12px;
  }
  .logo-ipb-brin {
    height: 38px;
  }
  .btn-header-action {
    padding: 5px 10px;
    font-size: 11px;
  }
}

/* ==========================================================================
   HERO / TITLE BANNER (EXACT POSTER REPLICATION)
   ========================================================================== */
.hero-section {
  padding-top: 28px;
  padding-bottom: 20px;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-top: 5px solid var(--accent-terracotta);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

@media (max-width: 640px) {
  .hero-card {
    padding: 18px 14px;
    border-radius: var(--radius-md);
  }
}

.hero-badge-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-sage-soft);
  color: var(--accent-sage-dark);
  border: 1px solid rgba(108, 154, 137, 0.3);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  margin-bottom: 14px;
}

.hero-title-main {
  font-size: clamp(21px, 3.2vw, 32px);
  font-weight: 700;
  color: var(--ink-primary);
  line-height: 1.28;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.hero-title-en {
  font-size: clamp(13px, 1.8vw, 15.5px);
  font-style: italic;
  font-weight: 400;
  color: var(--ink-muted);
  line-height: 1.4;
  margin-bottom: 20px;
}

/* Author Banner Pill */
.author-pill-banner {
  background: var(--accent-terracotta);
  color: #FFFFFF;
  border-radius: var(--radius-full);
  padding: 9px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 14px;
  font-size: 14.5px;
  font-weight: 700;
  box-shadow: 0 3px 10px rgba(221, 132, 102, 0.28);
  margin-bottom: 16px;
}

.author-pill-banner span {
  white-space: nowrap;
}

.author-pill-banner .bullet {
  opacity: 0.6;
}

@media (max-width: 640px) {
  .author-pill-banner {
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: 13px;
    gap: 6px 10px;
    justify-content: flex-start;
  }
}

/* Affiliations */
.affiliations-list {
  font-size: 12px;
  color: var(--ink-secondary);
  line-height: 1.55;
  border-top: 1px solid var(--border-card);
  padding-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.affiliations-list sup {
  color: var(--accent-terracotta-dark);
  font-weight: 700;
}

/* ==========================================================================
   QUICK METRICS STRIP - FULLY PROPORTIONAL & VERTICALLY BALANCED
   Fixes squished text in Image 2
   ========================================================================== */
.quick-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 22px;
}

@media (max-width: 900px) {
  .quick-metrics-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

.metric-pill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 6px;
  box-shadow: var(--shadow-subtle);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  min-width: 0;
}

.metric-pill-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.metric-pill-card.terracotta {
  border-left: 5px solid var(--accent-terracotta);
  background: linear-gradient(to right, rgba(221, 132, 102, 0.03), #FFFFFF);
}

.metric-pill-card.sage {
  border-left: 5px solid var(--accent-sage);
  background: linear-gradient(to right, rgba(108, 154, 137, 0.03), #FFFFFF);
}

.metric-pill-card.amber {
  border-left: 5px solid var(--accent-amber);
  background: linear-gradient(to right, rgba(212, 155, 85, 0.03), #FFFFFF);
}

.metric-category-tag {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--ink-muted);
  background: var(--bg-card-subtle);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-card);
}

.metric-val {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 700;
  line-height: 1.2;
  margin-top: 2px;
}

.metric-pill-card.terracotta .metric-val {
  color: var(--accent-terracotta-dark);
}
.metric-pill-card.sage .metric-val {
  color: var(--accent-sage-dark);
}
.metric-pill-card.amber .metric-val {
  color: var(--accent-amber-dark);
}

.metric-unit {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-muted);
  margin-left: 2px;
}

.metric-desc {
  font-size: 12px;
  color: var(--ink-secondary);
  line-height: 1.45;
  margin-top: 2px;
}

/* ==========================================================================
   SECTION CONTAINERS & HEADINGS
   ========================================================================== */
.content-section {
  padding-top: 32px;
  padding-bottom: 32px;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.section-header-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--ink-primary);
  padding-bottom: 10px;
  margin-bottom: 22px;
  gap: 12px;
  flex-wrap: wrap;
}

.section-title {
  font-size: clamp(18px, 2.8vw, 24px);
  font-weight: 700;
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.3;
}

.section-tag {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--accent-terracotta-dark);
  background: var(--accent-terracotta-soft);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

/* ==========================================================================
   RESPONSIVE GRIDS - COLLAPSE AT 1024PX FOR AMPLE BREATHING ROOM
   Fixes cramped two-column layout in Image 1
   ========================================================================== */
.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.two-col-grid > * {
  min-width: 0; /* Critical: prevents grid items from blowing out containers */
}

@media (max-width: 1024px) {
  .two-col-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

.three-col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.three-col-grid > * {
  min-width: 0;
}

@media (max-width: 1024px) {
  .three-col-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

/* Content Panel Card */
.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

@media (max-width: 640px) {
  .content-card {
    padding: 16px 14px;
    border-radius: var(--radius-sm);
  }
}

.card-title {
  font-family: var(--font-serif);
  font-size: clamp(15px, 2vw, 17.5px);
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.35;
}

.card-title .icon-accent {
  color: var(--accent-terracotta);
  flex-shrink: 0;
}

/* ==========================================================================
   STICKY MOBILE BOTTOM NAV
   ========================================================================== */
.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  border-top: 1.5px solid var(--border-card);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 4px;
  z-index: 100;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.06);
}

@media (min-width: 1025px) {
  .mobile-bottom-nav {
    display: none;
  }
  body {
    padding-bottom: 24px;
  }
}

.nav-item-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--ink-muted);
  font-size: 10px;
  font-weight: 600;
  padding: 6px 6px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  flex: 1;
  text-align: center;
}

.nav-item-bottom svg {
  width: 19px;
  height: 19px;
  transition: transform 0.2s ease;
}

.nav-item-bottom.active, .nav-item-bottom:hover {
  color: var(--accent-terracotta-dark);
}

.nav-item-bottom.active svg {
  transform: translateY(-1px);
}