/* ==========================================================================
   SAUVEGARDE DU PATRIMOINE DE LA BILLIERE
   Feuille de style officielle - Association Loi 1901 (RNA: W341012132)
   Design System Institutionnel, Curatorial & Typographique
   Palette: Raw Charcoal (#1C1A17), Earth Ocher (#C87D55), Alabaster (#F9F6F0)
   ========================================================================== */

:root {
  --color-charcoal: #1C1A17;
  --color-charcoal-soft: #2B2824;
  --color-ocher: #C87D55;
  --color-ocher-light: #E8A885;
  --color-ocher-dark: #A35C38;
  --color-ocher-transparent: rgba(200, 125, 85, 0.15);
  --color-alabaster: #F9F6F0;
  --color-white: #FFFFFF;
  --color-border: #D9D2C9;
  --color-border-dark: #8C827A;
  --color-text-muted: #5C554E;
  --color-bg-subtle: #F2EFE8;
  
  --font-serif: "Newsreader", "Playfair Display", "Cinzel", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --nav-total-height: 110px;
  --utility-height: 38px;
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-alabaster);
  color: var(--color-charcoal);
  font-family: var(--font-sans);
  line-height: 1.65;
  padding-top: var(--nav-total-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Typography Rules */
h1, h2, h3, h4, .font-serif {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-charcoal);
  line-height: 1.25;
}

h1 {
  font-size: clamp(2rem, 3.8vw, 3rem);
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}

h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 2px;
  background-color: var(--color-ocher);
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.15rem;
  font-size: 1.05rem;
  color: #2D2A26;
}

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

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

.mono-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* Reading Progress Strip */
#reading-progress-track {
  position: fixed;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  background: rgba(200, 125, 85, 0.2);
  z-index: 10001;
}

#reading-progress-bar {
  width: 100%;
  height: 0%;
  background-color: var(--color-ocher);
  transition: height 0.05s ease-out;
}

/* Fixed Header Layout */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 10000;
  background-color: var(--color-white);
  box-shadow: 0 2px 10px rgba(28, 26, 23, 0.06);
}

/* Row 1: Institutional Utility Bar */
.utility-bar {
  background: var(--color-charcoal);
  color: var(--color-alabaster);
  height: var(--utility-height);
  font-family: var(--font-mono);
  font-size: 13px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.utility-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.utility-left {
  display: flex;
  gap: 20px;
  align-items: center;
}

.utility-badge {
  background: var(--color-ocher);
  color: #FFFFFF;
  padding: 2px 8px;
  font-size: 10px;
  font-weight: 700;
  border-radius: 2px;
  letter-spacing: 0.08em;
}

.utility-right a {
  color: #E2DBD2;
  text-decoration: none;
  font-weight: 500;
}

.utility-right a:hover {
  color: var(--color-ocher-light);
  text-decoration: underline;
}

/* Row 2: Main Navigation Bar */
.main-nav-bar {
  height: calc(var(--nav-total-height) - var(--utility-height));
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  background: #FFFFFF;
}

.nav-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-identity {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-charcoal);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.brand-subtitle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-ocher-dark);
  letter-spacing: 0.04em;
}

/* Nav Menu Items */
.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 8px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-charcoal);
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.2s ease;
  min-height: 44px;
}

.nav-link:hover, .nav-item:hover > .nav-link {
  color: var(--color-ocher-dark);
  background-color: var(--color-bg-subtle);
  text-decoration: none;
}

.nav-caret {
  font-size: 9px;
  transition: transform 0.2s ease;
}

.nav-item:hover .nav-caret {
  transform: rotate(180deg);
}

/* Dropdown Menus */
.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 25px rgba(28, 26, 23, 0.1);
  border-radius: 6px;
  padding: 8px 0;
  list-style: none;
  z-index: 10005;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
  display: block;
}

.dropdown-link {
  display: flex;
  flex-direction: column;
  padding: 10px 18px;
  color: var(--color-charcoal);
  text-decoration: none;
  font-size: 0.92rem;
  transition: background 0.15s ease;
  min-height: 44px;
  justify-content: center;
}

.dropdown-link:hover {
  background: var(--color-bg-subtle);
  color: var(--color-ocher-dark);
  text-decoration: none;
}

.dropdown-link-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* Contact Button in Nav */
.nav-btn-contact {
  background-color: var(--color-charcoal);
  color: #FFFFFF !important;
  padding: 10px 20px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
}

.nav-btn-contact:hover {
  background-color: var(--color-ocher-dark);
  color: #FFFFFF !important;
  text-decoration: none;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.mobile-nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-charcoal);
  transition: all 0.2s ease;
}

/* Container & Layout */
.site-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 40px 24px;
}

.main-content {
  flex: 1 0 auto;
}

/* Asymmetrical Grid (1fr : 3fr) */
.asym-grid {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 32px;
  margin-top: 30px;
}

.sidebar-logs {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  height: fit-content;
}

.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ocher-dark);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.sidebar-entry {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
}

.sidebar-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.sidebar-label {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  display: block;
  margin-bottom: 2px;
}

.sidebar-value {
  color: var(--color-charcoal);
  font-weight: 600;
}

/* Content Area inside Grid */
.content-body {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 36px 40px;
}

/* Breadcrumbs */
.breadcrumb-trail {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-trail a {
  color: var(--color-text-muted);
}

.breadcrumb-trail a:hover {
  color: var(--color-ocher-dark);
}

/* Cards & Modules */
.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin: 28px 0;
}

.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 28px 0;
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 28px 0;
}

.card-box {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card-box:hover {
  border-color: var(--color-ocher);
  box-shadow: 0 8px 20px rgba(28, 26, 23, 0.05);
}

/* Status Badges */
.badge-status {
  display: inline-block;
  padding: 4px 10px;
  background: var(--color-ocher-transparent);
  color: var(--color-ocher-dark);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid rgba(200, 125, 85, 0.3);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.badge-official {
  background: #E8F0FE;
  color: #1A73E8;
  border-color: #C2D7FF;
}

.badge-archive {
  background: #ECEFF1;
  color: #455A64;
  border-color: #CFD8DC;
}

/* Impact Metrics Numbers */
.metric-box {
  background: var(--color-alabaster);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 20px;
  text-align: center;
}

.metric-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-ocher-dark);
  line-height: 1;
  margin-bottom: 8px;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--color-charcoal);
  letter-spacing: 0.04em;
}

/* Institutional Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #FFFFFF;
}

.inst-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.inst-table th {
  background-color: var(--color-charcoal);
  color: var(--color-alabaster);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 14px 16px;
  border: 1px solid #332F2A;
}

.inst-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-charcoal);
}

.inst-table tr:nth-child(even) td {
  background-color: #FCFAF6;
}

.inst-table tr:hover td {
  background-color: #F4EFE6;
}

.inst-table .mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Official Action Buttons (Non-commercial) */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-ocher-dark);
  color: #FFFFFF !important;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 12px 24px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  min-height: 44px;
}

.btn-primary:hover {
  background-color: var(--color-charcoal);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(28, 26, 23, 0.15);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-charcoal) !important;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 12px 24px;
  border-radius: 4px;
  border: 1px solid var(--color-border-dark);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  min-height: 44px;
}

.btn-secondary:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-charcoal);
  text-decoration: none;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 28px 0;
  align-items: center;
}

/* Institutional Forms */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
  color: var(--color-charcoal);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: #FFFFFF;
  color: var(--color-charcoal);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-ocher);
  box-shadow: 0 0 0 3px var(--color-ocher-transparent);
}

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

.form-help {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Image Frames */
.img-frame {
  width: 100%;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  overflow: hidden;
  margin-bottom: 18px;
  background: #EAE6DF;
}

.img-frame img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.card-box:hover .img-frame img {
  transform: scale(1.02);
}

/* Banner / Hero Section */
.hero-wrapper {
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 36px;
  background: var(--color-charcoal);
}

.hero-media {
  width: 100%;
  height: 480px;
  position: relative;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(28, 26, 23, 0.95) 0%, rgba(28, 26, 23, 0.4) 60%, rgba(28, 26, 23, 0.2) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 48px;
  color: #FFFFFF;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-ocher-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero-title {
  color: #FFFFFF;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.15;
  margin-bottom: 16px;
  max-width: 900px;
}

.hero-summary-statement {
  font-size: 1.15rem;
  color: #E2DBD2;
  line-height: 1.6;
  max-width: 860px;
  margin-bottom: 24px;
}

/* Non-Profit Declaration Callout */
.declaration-callout {
  background: #FCFAF6;
  border-left: 4px solid var(--color-ocher);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 22px 28px;
  border-radius: 0 6px 6px 0;
  margin: 28px 0;
}

.declaration-callout p {
  margin-bottom: 0;
  font-size: 1.05rem;
  color: #2D2A26;
}

/* Timeline */
.timeline-track {
  position: relative;
  padding-left: 32px;
  margin: 32px 0;
}

.timeline-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--color-border-dark);
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-ocher);
  border: 2px solid #FFFFFF;
  box-shadow: 0 0 0 2px var(--color-ocher-dark);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ocher-dark);
  margin-bottom: 4px;
}

/* Footer Architecture */
.site-footer {
  background-color: var(--color-charcoal);
  color: var(--color-alabaster);
  border-top: 3px solid var(--color-ocher);
  margin-top: 60px;
}

.footer-top {
  padding: 48px 0 36px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
}

.footer-col h4 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: #FFFFFF;
  margin-bottom: 18px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #D9D2C9;
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-ocher-light);
  text-decoration: underline;
}

.footer-meta-item {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-bottom: 8px;
  color: #C4BBB0;
}

.footer-bottom {
  padding: 24px 0;
  background-color: #141210;
}

.footer-mandatory-disclosure {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: #A8A096;
  border-left: 2px solid var(--color-ocher);
  padding-left: 16px;
  margin-top: 16px;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  #reading-progress-track {
    display: none !important;
  }
  
  .asym-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .card-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .card-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  
  .mobile-nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    align-items: stretch;
    padding: 16px 24px;
    border-bottom: 2px solid var(--color-border);
    box-shadow: 0 12px 30px rgba(0,0,0,0.12);
    max-height: 80vh;
    overflow-y: auto;
  }
  
  .nav-menu.is-active {
    display: flex;
  }
  
  .nav-item {
    width: 100%;
  }
  
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding-left: 16px;
    background: var(--color-bg-subtle);
    margin-top: 4px;
    border-radius: 4px;
  }
  
  .nav-item.open-mobile .dropdown-menu {
    display: block;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-total-height: 125px;
    --utility-height: 48px;
  }
  
  body {
    padding-top: var(--nav-total-height);
  }
  
  .utility-container {
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    padding: 6px 16px;
    text-align: center;
  }
  
  .utility-left {
    gap: 8px;
    font-size: 11px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .utility-right {
    font-size: 11px;
  }
  
  .card-grid-2, .card-grid-4 {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-media {
    height: 380px;
  }
  
  .hero-overlay {
    padding: 24px;
  }
  
  .content-body {
    padding: 24px 20px;
  }
  
  .btn-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn-primary, .btn-secondary {
    width: 100%;
    text-align: center;
  }
}