/* ============================================
   FOOTER COMPONENT
   Society & AI Design System
   ============================================

   Site footer including:
   - Main footer grid (brand, columns)
   - SDG section
   - Bottom bar
   - Technical acknowledgments
   - Fade effect

   Requires: tokens.css to be loaded first
   ============================================ */

/* ==========================================
   FOOTER BASE
   ========================================== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: var(--space-12) 0 var(--space-4);
  margin-top: 0;
}

/* ==========================================
   FOOTER CONTENT GRID
   ========================================== */
.footer-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-12);
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: var(--space-16);
  margin-bottom: var(--space-8);
}

/* ==========================================
   FOOTER SECTIONS (COLUMNS)
   ========================================== */
.footer-section h3,
.footer-section h4 {
  margin-bottom: var(--space-4);
}

.footer-section h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
}

.footer-section h4 {
  font-size: 1.1rem;
  font-weight: var(--font-semibold);
  color: var(--footer-text);
}

.footer-mission {
  font-size: 0.95rem;
  line-height: var(--leading-relaxed);
  color: var(--footer-text-muted);
  margin-bottom: var(--space-6);
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section ul li {
  margin-bottom: var(--space-2);
}

.footer-section a {
  color: var(--footer-link);
  text-decoration: none;
  font-size: 0.95rem;
}

.footer-section a:hover {
  color: var(--footer-link-hover);
  text-decoration: underline;
}

/* ==========================================
   SOCIAL ICONS
   ========================================== */
.social-icons {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.social-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  transition: background var(--transition-base);
}

.social-icons a:hover {
  background: rgba(255, 255, 255, 0.2);
}

.social-icons svg {
  width: 20px;
  height: 20px;
  fill: var(--footer-link);
  transition: fill var(--transition-base);
}

.social-icons a:hover svg {
  fill: var(--footer-link-hover);
}

/* ==========================================
   FOOTER BRAND SEPARATOR
   ========================================== */
.footer-brand-separator {
  width: 100%;
  height: 1px;
  background: var(--footer-border);
  margin: var(--space-6) 0;
}

/* ==========================================
   LOCATION SECTION
   ========================================== */
.footer-location {
  margin-top: var(--space-4);
}

.footer-location p {
  font-size: 0.9rem;
  line-height: var(--leading-relaxed);
  color: var(--footer-text-muted);
  margin-bottom: var(--space-2);
}

.made-with-love {
  font-size: 0.95rem;
  color: var(--footer-text);
}

.distributed-note {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-gray-400);
}

/* ==========================================
   UN SDG SECTION
   ========================================== */
.footer-impact-section {
  max-width: var(--max-width-content);
  margin: 0 auto var(--space-8);
  padding: var(--space-8) var(--space-12);
  border-top: 1px solid var(--footer-border);
}

.footer-impact-content h4 {
  font-size: 1.1rem;
  font-weight: var(--font-semibold);
  color: var(--footer-text);
  margin-bottom: var(--space-6);
}

.sdg-main-container {
  display: flex;
  flex-direction: row;
  gap: var(--space-2);
  align-items: flex-start;
}

.sdg-main-logo {
  height: 120px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.sdg-goals-grid {
  display: flex;
  flex-direction: row;
  gap: var(--space-2);
  flex-shrink: 0;
  align-items: center;
}

.sdg-goal-logo {
  height: 120px;
  width: auto;
  object-fit: contain;
}

.sdg-text {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--footer-text-muted);
  margin: 0 0 0 var(--space-8);
  flex: 1;
}

/* ==========================================
   BOTTOM FOOTER
   ========================================== */
.footer-bottom {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: var(--space-6) var(--space-12) var(--space-4);
  border-top: 1px solid var(--footer-border);
}

.footer-bottom-left {
  text-align: left;
}

.footer-bottom-left p {
  color: var(--color-gray-400);
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
}

.attribution-note {
  font-size: 0.85rem;
  color: var(--color-gray-500);
  font-style: italic;
}

.footer-bottom-left a {
  color: var(--footer-link);
  text-decoration: none;
}

.footer-bottom-left a:hover {
  color: var(--footer-link-hover);
  text-decoration: underline;
}

/* ==========================================
   TECHNICAL ACKNOWLEDGMENTS
   ========================================== */
.footer-acknowledgments {
  max-width: var(--max-width-content);
  margin: var(--space-4) auto 0;
  padding: var(--space-6) var(--space-12);
  border-top: 1px solid var(--footer-border);
}

.acknowledgments-content {
  text-align: center;
}

.acknowledgments-text {
  font-size: 0.875rem;
  line-height: var(--leading-relaxed);
  color: var(--color-gray-500);
  margin: 0;
}

.acknowledgments-text strong {
  color: var(--color-gray-400);
  font-weight: var(--font-semibold);
}

.acknowledgments-text a {
  color: var(--footer-link);
  text-decoration: none;
}

.acknowledgments-text a:hover {
  color: var(--footer-link-hover);
  text-decoration: underline;
}

/* ==========================================
   FOOTER FADE EFFECT
   ========================================== */
.footer-fade {
  position: relative;
  text-align: center;
  padding: var(--space-8) 0;
}

.footer-fade span {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: var(--font-light);
  color: rgba(255, 255, 255, 0.05);
  letter-spacing: 2px;
  opacity: 0.1;
  pointer-events: none;
  user-select: none;
}

/* ==========================================
   RESPONSIVE STYLES
   ========================================== */
@media (max-width: 1200px) {
  .footer-content {
    max-width: 1200px;
    padding: 0 2.5rem;
    gap: var(--space-12);
  }

  .sdg-main-logo {
    max-width: 180px;
  }
}

@media (max-width: 968px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    padding: 0 var(--space-8);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .sdg-main-logo {
    max-width: 160px;
  }
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-impact-section {
    padding: 2.5rem var(--space-6);
  }

  .footer-impact-content h4 {
    text-align: center;
    margin-bottom: var(--space-6);
  }

  .sdg-main-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-6);
  }

  .sdg-main-logo {
    height: auto;
    width: 70%;
    max-width: 280px;
    margin-bottom: var(--space-2);
  }

  .sdg-goals-grid {
    width: 100%;
    justify-content: center;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: var(--space-4);
  }

  .sdg-goal-logo {
    height: auto;
    width: 30%;
    min-width: 100px;
    max-width: 130px;
  }

  .sdg-text {
    text-align: left;
    margin: 0;
    padding: 0;
    max-width: 100%;
    font-size: 0.9rem;
    line-height: var(--leading-loose);
  }

  .footer-bottom {
    text-align: center;
    padding: var(--space-6) var(--space-8) var(--space-4);
  }

  .footer-bottom-left {
    text-align: center;
  }

  .footer-acknowledgments {
    padding: var(--space-4) var(--space-6);
  }

  .acknowledgments-text {
    font-size: 0.8rem;
  }

  .footer-fade span {
    font-size: 2.5rem;
  }
}

@media (max-width: 480px) {
  .footer-impact-section {
    padding: var(--space-8) var(--space-4);
  }

  .sdg-main-container {
    gap: 1.25rem;
  }

  .sdg-main-logo {
    height: auto;
    width: 80%;
    max-width: 260px;
  }

  .sdg-goals-grid {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-2);
    width: 100%;
    justify-content: center;
  }

  .sdg-goal-logo {
    height: auto;
    width: 31%;
    min-width: 90px;
    max-width: 110px;
  }

  .sdg-text {
    font-size: 0.875rem;
    line-height: var(--leading-loose);
    padding: 0;
  }
}