/* ==========================================================================
   PORTAIL INSTITUTIONNEL - SOCIETE EUROPEENNE DES EXPLORATEURS (ACCA)
   Design System & Feuille de style principale
   Conforme aux directives d'accessibilité WCAG AA et responsive design
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. VARIABLES CSS & PALETTE OFFICIELLE
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #800000;
  --color-primary-dark: #7A0016;
  --color-primary-light: #991b1b;
  --color-accent-navy: #0B2545;
  --color-accent-blue: #133c55;
  --color-bg-white: #FFFFFF;
  --color-bg-neutral: #F9F8F6;
  --color-bg-utility: #F4F4F4;
  --color-text-main: #1F2937;
  --color-text-muted: #4B5563;
  --color-text-light: #6B7280;
  --color-border: #E5E7EB;
  --color-border-dark: #D1D5DB;
  --color-footer-bg: #222222;
  --color-footer-surface: #2A2A2A;
  --color-footer-text: #E5E7EB;
  --color-footer-muted: #9CA3AF;
  
  --font-serif: "Georgia", "Garamond", "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --container-max: 1240px;
}

/* --------------------------------------------------------------------------
   2. RESET & BASE TYPOGRAPHY
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--color-accent-navy);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
}

h1 { font-size: 2.35rem; }
h2 { font-size: 1.85rem; border-bottom: 2px solid var(--color-primary); padding-bottom: 0.5rem; margin-top: 2rem; }
h3 { font-size: 1.4rem; margin-top: 1.5rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1.25rem;
  max-width: 80ch;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover, a:focus {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   3. STRUCTURE & LAYOUT CONTAINERS
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: 3.5rem 0;
}

.section-neutral {
  background-color: var(--color-bg-neutral);
}

.section-white {
  background-color: var(--color-bg-white);
}

.section-maroon-strip {
  background-color: var(--color-primary);
  color: #FFFFFF;
  padding: 3rem 0;
}

.section-maroon-strip h2,
.section-maroon-strip h3,
.section-maroon-strip p {
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.3);
}

/* --------------------------------------------------------------------------
   4. HEADER & INSTITUTIONAL NAVIGATION
   -------------------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: #FFFFFF;
  position: relative;
  z-index: 100;
}

/* Top Utility Bar */
.top-utility-bar {
  background-color: var(--color-bg-utility);
  border-bottom: 1px solid var(--color-border);
  min-height: 34px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.top-utility-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding-top: 0.25rem;
  padding-bottom: 0.25rem;
}

.utility-left, .utility-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.utility-badge {
  background-color: #E2E8F0;
  color: var(--color-accent-navy);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-family: monospace;
}

.utility-link {
  color: var(--color-text-muted);
  font-weight: 500;
}

.utility-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.search-form-mini {
  display: flex;
  align-items: center;
}

.search-input-mini {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  color: var(--color-text-main);
  min-width: 140px;
}

/* Central Branding Header */
.branding-header {
  padding: 1.75rem 0 1.25rem 0;
  text-align: center;
  background-color: #FFFFFF;
}

.brand-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.institutional-emblem-svg {
  width: 52px;
  height: 52px;
  fill: var(--color-primary);
}

.brand-title-group {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.brand-acronym {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.08em;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-accent-navy);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 0.25rem;
}

/* Tier 1 Primary Navigation Bar */
.primary-nav-bar {
  background-color: var(--color-primary);
  border-top: 2px solid var(--color-primary-dark);
  border-bottom: 2px solid var(--color-primary-dark);
}

.nav-toggle-btn {
  display: none;
  background: none;
  border: none;
  color: #FFFFFF;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  cursor: pointer;
  width: 100%;
  text-align: left;
  min-height: 44px;
}

.nav-menu-primary {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}

.nav-item-primary {
  position: relative;
}

.nav-link-primary {
  display: block;
  color: #FFFFFF;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.85rem 1.25rem;
  min-height: 44px;
  text-transform: uppercase;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link-primary:hover,
.nav-link-primary:focus,
.nav-link-primary.active {
  background-color: var(--color-primary-dark);
  color: #FFFFFF;
  text-decoration: none;
}

/* Tier 2 Sub-Bar / Institutional Mega Directory Bar */
.tier2-sub-bar {
  background-color: #F8FAFC;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.825rem;
  padding: 0.5rem 0;
}

.tier2-sub-bar .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}

.tier2-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tier2-label {
  font-weight: 700;
  color: var(--color-accent-navy);
  text-transform: uppercase;
  font-size: 0.75rem;
}

.tier2-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tier2-link {
  color: var(--color-text-muted);
}

.tier2-link:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.tier2-sep {
  color: var(--color-border-dark);
}

/* --------------------------------------------------------------------------
   5. BUTTONS & CALL-TO-ACTION (STRICT CONTACT ROUTING)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.35rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
  min-width: 44px;
  text-align: center;
  line-height: 1.2;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF !important;
  border: 1px solid var(--color-primary-dark);
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--color-primary-dark);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--color-primary) !important;
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover, .btn-secondary:focus {
  background-color: var(--color-bg-neutral);
  text-decoration: none;
}

.btn-navy {
  background-color: var(--color-accent-navy);
  color: #FFFFFF !important;
  border: 1px solid #06162a;
}

.btn-navy:hover {
  background-color: #06162a;
  text-decoration: none;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-top: 1.5rem;
}

/* --------------------------------------------------------------------------
   6. UI MODULES & COMPONENTS
   -------------------------------------------------------------------------- */

/* Hero Banner Module */
.hero-wrapper {
  position: relative;
  background-color: var(--color-accent-navy);
  color: #FFFFFF;
  overflow: hidden;
}

.hero-image-container {
  position: relative;
  width: 100%;
  max-height: 520px;
  overflow: hidden;
}

.hero-img {
  width: 100%;
  height: 520px;
  object-fit: cover;
  filter: brightness(0.65);
}

.hero-content-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  background: linear-gradient(to right, rgba(11, 37, 69, 0.92) 0%, rgba(11, 37, 69, 0.7) 60%, rgba(128, 0, 0, 0.4) 100%);
  padding: 2.5rem 0;
}

.hero-text-block {
  max-width: 820px;
}

.hero-text-block h1 {
  color: #FFFFFF;
  font-size: 2.75rem;
  margin-bottom: 0.75rem;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-slogan {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-style: italic;
  color: #F3F4F6;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.hero-summary-box {
  background-color: rgba(255, 255, 255, 0.12);
  border-left: 4px solid var(--color-primary-light);
  padding: 1.15rem 1.5rem;
  margin-bottom: 1.75rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  backdrop-filter: blur(4px);
}

.hero-summary-box p {
  margin-bottom: 0;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.55;
  color: #FFFFFF;
}

/* Mission Box */
.mission-highlight-block {
  background-color: var(--color-bg-neutral);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  padding: 2rem 2.25rem;
  margin: 2.5rem 0;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.mission-highlight-block h2,
.mission-highlight-block h3 {
  color: var(--color-primary);
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}

.mission-highlight-block p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-text-main);
}

/* Two-Column Split Panels */
.split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  margin: 3rem 0;
}

.split-panel.reverse {
  direction: rtl;
}

.split-panel.reverse > * {
  direction: ltr;
}

.split-panel-media img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  width: 100%;
  aspect-ratio: 16 / 9;
}

/* Cards Grid */
.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin: 2rem 0;
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin: 2rem 0;
}

.card-item {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.card-title a {
  color: var(--color-accent-navy);
}

.card-title a:hover {
  color: var(--color-primary);
}

.card-text {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: 1rem;
}

/* Events Grid & Date Badges */
.events-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.event-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.event-date-badge {
  background-color: var(--color-primary);
  color: #FFFFFF;
  text-align: center;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  align-self: flex-start;
  margin-bottom: 0.85rem;
  min-width: 60px;
}

.event-date-month {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
}

.event-date-day {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.1;
  display: block;
}

.event-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.event-meta {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.event-meta span {
  display: block;
}

/* Statistics Side-Rail / Chiffres Clés */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.stat-box {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  padding: 1.5rem;
  text-align: center;
  border-radius: var(--radius-sm);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent-navy);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat-desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.35rem;
  margin-bottom: 0;
}

/* Tables Styling */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.table-custom {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.table-custom th,
.table-custom td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.table-custom th {
  background-color: var(--color-accent-navy);
  color: #FFFFFF;
  font-weight: 600;
  font-family: var(--font-serif);
}

.table-custom tr:nth-child(even) {
  background-color: var(--color-bg-neutral);
}

.table-custom tr:hover {
  background-color: #F1F5F9;
}

.table-custom tfoot td {
  font-weight: 700;
  background-color: #E2E8F0;
  border-top: 2px solid var(--color-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.35rem;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--color-accent-navy);
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  color: var(--color-text-main);
  min-height: 44px;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(128, 0, 0, 0.15);
}

textarea.form-control {
  min-height: 130px;
  resize: vertical;
}

/* Layout with Sidebar */
.content-with-sidebar {
  display: grid;
  grid-template-columns: 2.4fr 1fr;
  gap: 2.5rem;
  margin: 2.5rem 0;
}

.main-article {
  max-width: 100%;
}

.sidebar-panel {
  background-color: var(--color-bg-neutral);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  align-self: start;
}

.sidebar-widget {
  margin-bottom: 2rem;
}

.sidebar-widget:last-child {
  margin-bottom: 0;
}

.sidebar-title {
  font-size: 1.15rem;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-border-dark);
  padding-bottom: 0.4rem;
  margin-bottom: 1rem;
}

.sidebar-list {
  list-style: none;
  padding: 0;
}

.sidebar-list li {
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.9rem;
}

.sidebar-list li a {
  color: var(--color-text-main);
}

.sidebar-list li a:hover {
  color: var(--color-primary);
}

/* Breadcrumbs */
.breadcrumb-nav {
  background-color: var(--color-bg-neutral);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.85rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.5rem;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   7. FOOTER ARCHITECTURE
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  border-top: 4px solid var(--color-primary);
  margin-top: auto;
}

.footer-brand-header {
  text-align: center;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 2.5rem;
}

.footer-shield-svg {
  width: 46px;
  height: 46px;
  fill: #FFFFFF;
  margin: 0 auto 0.75rem auto;
}

.footer-org-name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.footer-org-status {
  font-size: 0.85rem;
  color: var(--color-footer-muted);
}

.footer-columns-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-col h4 {
  color: #FFFFFF;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin-bottom: 1.15rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 0.4rem;
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: var(--color-footer-muted);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

.footer-legal-block {
  background-color: var(--color-footer-surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-bottom: 2rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: #D1D5DB;
  text-align: center;
}

.footer-bottom-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  color: var(--color-footer-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

.footer-bottom-links a {
  color: var(--color-footer-muted);
}

.footer-bottom-links a:hover {
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   8. MEDIA QUERIES & MOBILE RESPONSIVE ARCHITECTURE
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .cards-grid-4,
  .events-grid,
  .stats-strip,
  .footer-columns-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .content-with-sidebar {
    grid-template-columns: 1fr;
  }
  
  .hero-content-overlay {
    position: relative;
    background: var(--color-accent-navy);
    padding: 2.5rem 1.5rem;
  }
  
  .hero-img {
    height: 340px;
  }
}

@media (max-width: 768px) {
  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .top-utility-bar .container {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
  
  .utility-left, .utility-right {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  
  .nav-toggle-btn {
    display: block;
  }
  
  .nav-menu-primary {
    display: none;
    flex-direction: column;
    width: 100%;
    background-color: var(--color-primary-dark);
  }
  
  .nav-menu-primary.is-open {
    display: flex;
  }
  
  .nav-item-primary {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .nav-link-primary {
    padding: 0.85rem 1.25rem;
    min-height: 44px;
    width: 100%;
  }
  
  .tier2-sub-bar .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .split-panel {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .cards-grid-4,
  .cards-grid-3,
  .cards-grid-2,
  .events-grid,
  .stats-strip,
  .footer-columns-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom-bar {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .btn-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    width: 100%;
  }
}