/* ==========================================================================
   AiHub.sol - Header, Navigation & Footer Styles
   ========================================================================== */

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(7, 7, 9, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  height: 74px;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.25rem;
  width: 100%;
}

/* Brand Logo Anchor */
.brand-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  line-height: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.brand-logo:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.brand-logo img,
.brand-logo-img {
  height: 40px;
  width: auto;
  aspect-ratio: 2172 / 724;
  object-fit: contain;
  background: transparent;
  border: none;
  box-shadow: none;
  display: block;
}

/* Desktop Navigation */
.header-nav {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 0.95rem;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.nav-link:hover {
  color: #ffffff;
  background-color: var(--bg-surface-elevated);
}

.nav-link.active {
  color: var(--accent-orange);
  background-color: var(--accent-orange-subtle);
  font-weight: 600;
}

/* Header Right Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-shrink: 0;
}

.header-search-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  height: 38px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-muted);
  padding: 0 0.95rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.header-search-btn:hover {
  border-color: var(--accent-orange);
  color: var(--text-secondary);
  background-color: var(--bg-surface-hover);
}

.header-search-btn kbd {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Submit CTA in Header */
#header-submit-btn {
  height: 38px;
  padding: 0 1.15rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  font-size: 0.875rem;
}

/* User Profile Badge in Header */
.user-menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 38px;
  padding: 0 0.85rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.header-avatar-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 1.5px solid var(--border-accent);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.user-menu-btn:hover {
  border-color: var(--accent-orange);
  background-color: var(--bg-surface-hover);
}

/* User Dropdown Menu Wrapper */
.user-menu-dropdown-wrap {
  position: relative;
  display: inline-block;
}

.user-dropdown-chevron {
  transition: transform var(--transition-fast);
  color: var(--text-muted);
  margin-left: 0.15rem;
}

.user-menu-dropdown-wrap.open .user-dropdown-chevron {
  transform: rotate(180deg);
  color: var(--accent-orange);
}

.user-menu-dropdown-wrap.open .user-menu-btn {
  border-color: var(--accent-orange);
  background-color: var(--bg-surface-hover);
  box-shadow: 0 0 15px var(--accent-orange-glow);
}

.user-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 240px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 25px rgba(0, 0, 0, 0.7);
  z-index: 1000;
  display: none;
  flex-direction: column;
  overflow: hidden;
  animation: dropdownFadeIn 0.18s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.user-menu-dropdown-wrap.open .user-dropdown-menu {
  display: flex;
}

@keyframes dropdownFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.user-dropdown-header {
  padding: 1rem 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-surface-elevated);
}

.user-dropdown-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--border-accent);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.user-dropdown-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-dropdown-meta {
  overflow: hidden;
}

.user-dropdown-name {
  font-weight: 700;
  color: #ffffff;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-dropdown-handle {
  font-size: 0.75rem;
  color: var(--accent-orange);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-dropdown-stars {
  font-size: 0.725rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.user-dropdown-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 0;
}

.user-dropdown-list {
  list-style: none;
  margin: 0;
  padding: 0.4rem 0;
}

.user-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-dropdown-item:hover {
  background: var(--bg-surface-hover);
  color: var(--accent-orange);
}

.user-dropdown-item svg {
  color: var(--text-muted);
  transition: color var(--transition-fast);
  flex-shrink: 0;
}

.user-dropdown-item:hover svg {
  color: var(--accent-orange);
}

.user-dropdown-footer {
  padding: 0.4rem 0;
}

.user-dropdown-item.btn-dropdown-signout {
  color: var(--text-muted);
}

.user-dropdown-item.btn-dropdown-signout:hover {
  color: var(--color-danger);
  background: rgba(239, 68, 68, 0.08);
}

.user-dropdown-item.btn-dropdown-signout:hover svg {
  color: var(--color-danger);
}

.user-stars-pill {
  color: var(--accent-orange);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.user-reputation-pill {
  color: var(--color-success);
  font-weight: 700;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

#header-checkin-btn {
  height: 38px;
  padding: 0 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

#header-checkin-btn:hover {
  border-color: var(--accent-orange);
  background-color: var(--bg-surface-hover);
}

.header-auth-group {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

#header-signin-btn,
#header-signup-btn {
  height: 38px;
  padding: 0 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

#header-signup-btn {
  background-color: var(--accent-orange-subtle);
  border-color: rgba(255, 122, 0, 0.4);
  color: var(--accent-orange);
}

#header-signup-btn:hover {
  background-color: var(--accent-orange);
  border-color: var(--accent-orange);
  color: #ffffff;
  box-shadow: 0 0 12px var(--accent-orange-glow);
}

.user-name-pill {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Mobile Toggle */
.mobile-toggle-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(7, 7, 9, 0.98);
  backdrop-filter: blur(16px);
  z-index: 999;
  padding: 2rem 1.5rem;
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  overflow-y: auto;
  border-top: 1px solid var(--border-subtle);
}

.mobile-drawer.open {
  display: flex;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.mobile-nav-link.active,
.mobile-nav-link:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
  background: var(--accent-orange-subtle);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand-col p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 340px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-orange);
}

/* Footer Social Links (Community Column) */
.footer-social-wrapper {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.footer-social-title {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.footer-social-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.footer-social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.footer-social-btn:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
  background-color: var(--accent-orange-subtle);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 122, 0, 0.15);
}

.footer-social-btn:focus-visible {
  outline: 2px solid var(--accent-orange);
  outline-offset: 2px;
}

.footer-social-btn svg {
  display: block;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   Footer Donation Section (Support AiHub.sol)
   -------------------------------------------------------------------------- */
.footer-donation-card {
  background: linear-gradient(135deg, rgba(255, 122, 0, 0.04) 0%, rgba(18, 18, 26, 0.85) 45%, rgba(14, 14, 20, 0.98) 100%);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 0; /* Padding handled by toggle header & inner collapse */
  margin-bottom: 3.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 36px rgba(0, 0, 0, 0.45);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.footer-donation-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--accent-orange) 50%, transparent 100%);
  opacity: 0.8;
  z-index: 2;
}

.footer-donation-card:hover {
  border-color: rgba(255, 122, 0, 0.4);
}

.footer-donation-card.is-expanded {
  border-color: rgba(255, 122, 0, 0.3);
}

/* Persistent Interactive Header / Toggle Bar */
.footer-donation-toggle-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem 2.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  color: inherit;
  transition: background-color var(--transition-fast);
  outline: none;
  user-select: none;
}

.footer-donation-toggle-header:hover {
  background: rgba(255, 122, 0, 0.03);
}

.footer-donation-toggle-header:focus-visible {
  outline: 2px solid var(--accent-orange);
  outline-offset: -2px;
}

.donation-header-left {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.donation-badge-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-orange);
}

.donation-badge-text {
  opacity: 0.9;
}

.donation-header-titles {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.footer-donation-heading {
  font-size: 1.3rem;
  font-weight: 800;
  color: #ffffff;
  margin: 0;
  letter-spacing: -0.01em;
  font-family: var(--font-heading);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-donation-short-sub {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
}

/* Right toggle action button/badge */
.donation-toggle-action {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(255, 122, 0, 0.09);
  border: 1px solid rgba(255, 122, 0, 0.25);
  color: var(--accent-orange);
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.footer-donation-toggle-header:hover .donation-toggle-action {
  background: var(--accent-orange);
  color: #ffffff;
  border-color: var(--accent-orange);
  box-shadow: 0 0 14px var(--accent-orange-glow);
  transform: translateY(-1px);
}

.donation-toggle-label {
  letter-spacing: 0.02em;
}

.donation-toggle-icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  font-size: 0.7rem;
  line-height: 1;
}

.chevron-char {
  display: inline-block;
  font-size: 0.75rem;
  line-height: 1;
  transition: transform var(--transition-fast);
}

/* CSS Grid Height Animation for Smooth Collapsible Region */
.footer-donation-collapse {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  visibility: hidden;
  transition: grid-template-rows 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              visibility 0.35s;
}

.footer-donation-card.is-expanded .footer-donation-collapse {
  grid-template-rows: 1fr;
  opacity: 1;
  visibility: visible;
}

.footer-donation-collapse-inner {
  overflow: hidden;
}

.footer-donation-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 3rem;
  align-items: flex-start;
  padding: 0.5rem 2.25rem 2.25rem 2.25rem;
  border-top: 1px solid var(--border-subtle);
}

/* Intro / Left Column */
.footer-donation-intro {
  display: flex;
  flex-direction: column;
}

.footer-donation-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.25);
  color: var(--accent-orange);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.donation-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-orange);
  box-shadow: 0 0 8px var(--accent-orange);
  display: inline-block;
}

.footer-donation-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.01em;
  font-family: var(--font-heading);
}

.footer-donation-subheading {
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.55;
  margin: 0 0 1.25rem 0;
}

/* Safety Note Banner */
.donation-safety-note {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: rgba(255, 122, 0, 0.07);
  border: 1px solid rgba(255, 122, 0, 0.3);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.safety-note-icon {
  color: var(--accent-orange);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.safety-note-text {
  font-size: 0.8rem;
  line-height: 1.45;
  color: #e2e8f0;
}

.safety-note-text strong {
  color: var(--accent-orange);
  font-weight: 700;
}

/* Left Column Highlights */
.donation-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.donation-highlight-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.775rem;
  color: var(--text-muted);
}

.highlight-bullet {
  color: var(--accent-orange);
  font-weight: 700;
  font-size: 0.85rem;
}

/* Right / Payment Methods Grid Container */
.footer-donation-methods-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0;
}

.donation-group-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.825rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.donation-group-count {
  font-size: 0.725rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: none;
}

.donation-methods-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

/* Individual Payment Card */
.donation-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: all var(--transition-fast);
  min-width: 0;
}

.donation-card:hover {
  border-color: rgba(255, 122, 0, 0.4);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

.donation-card.featured-donation-card {
  border-color: rgba(20, 241, 149, 0.35);
  background: linear-gradient(180deg, rgba(20, 241, 149, 0.03) 0%, var(--bg-surface) 100%);
}

.donation-card.featured-donation-card:hover {
  border-color: rgba(20, 241, 149, 0.6);
  box-shadow: 0 6px 20px rgba(20, 241, 149, 0.15);
}

.donation-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.donation-card-network {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.donation-network-icon {
  flex-shrink: 0;
  border-radius: 50%;
}

.donation-card-titles {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.donation-card-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: #ffffff;
  line-height: 1.2;
}

.donation-card-network-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.donation-card-badge {
  font-size: 0.675rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--badge-color, #FF7A00);
  border: 1px solid rgba(255, 255, 255, 0.1);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.donation-address-container {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.donation-address-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.7rem;
}

.donation-type-label {
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.65rem;
}

.btn-toggle-qr {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-toggle-qr:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
  background: rgba(255, 122, 0, 0.08);
}

.donation-address-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.45rem 0.35rem 0.65rem;
  gap: 0.5rem;
  transition: border-color var(--transition-fast);
}

.donation-address-box:hover,
.donation-address-box:focus-within {
  border-color: rgba(255, 122, 0, 0.4);
}

.donation-address-val {
  font-family: var(--font-mono, 'SFMono-Regular', Consolas, Menlo, monospace);
  font-size: 0.775rem;
  color: #ffffff;
  font-weight: 500;
  letter-spacing: 0.01em;
  word-break: break-all;
  user-select: all;
  flex: 1;
  line-height: 1.35;
}

.btn-copy-address {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  height: 30px;
  padding: 0 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--accent-orange);
  border: 1px solid var(--accent-orange);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.btn-copy-address:hover {
  background: var(--accent-orange-hover);
  border-color: var(--accent-orange-hover);
  box-shadow: 0 0 12px var(--accent-orange-glow);
  transform: translateY(-1px);
}

.btn-copy-address.copied {
  background: var(--color-success);
  border-color: var(--color-success);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
}

/* QR Code Display Panel */
.donation-qr-panel {
  transition: all var(--transition-normal);
  overflow: hidden;
}

.donation-qr-panel.qr-hidden {
  display: none;
}

.donation-qr-panel.qr-visible {
  display: block;
  animation: fadeInDown 0.2s ease-out;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.donation-qr-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.donation-qr-box {
  background: #ffffff;
  padding: 0.4rem;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.donation-qr-box svg {
  display: block;
  width: 116px;
  height: 116px;
}

.donation-qr-caption {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
  letter-spacing: 0.01em;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

/* --------------------------------------------------------------------------
   Responsive Header & Footer Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .footer-donation-layout {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .footer-donation-intro {
    max-width: 700px;
  }
}

@media (max-width: 992px) {
  .nav-menu {
    display: none;
  }
  
  #header-signup-btn {
    display: none;
  }
  
  .mobile-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .footer-donation-toggle-header {
    padding: 1.35rem 1.75rem;
  }

  .footer-donation-layout {
    padding: 0.5rem 1.75rem 1.75rem 1.75rem;
  }

  .donation-methods-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 64px;
  }

  .brand-logo img,
  .brand-logo-img {
    height: 28px;
    width: auto;
    aspect-ratio: 2172 / 724;
  }

  .header-inner {
    gap: 0.5rem;
  }

  .header-search-btn {
    display: none;
  }

  .mobile-drawer {
    top: 64px;
  }

  .footer-donation-card {
    margin-bottom: 2.5rem;
  }

  .footer-donation-toggle-header {
    padding: 1.15rem 1.25rem;
    gap: 1rem;
  }

  .footer-donation-heading {
    font-size: 1.15rem;
  }

  .footer-donation-short-sub {
    font-size: 0.8rem;
  }

  .donation-toggle-action {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
    gap: 0.4rem;
  }

  .footer-donation-layout {
    padding: 0.5rem 1.25rem 1.5rem 1.25rem;
    gap: 1.75rem;
  }

  .footer-donation-title {
    font-size: 1.2rem;
  }

  .donation-card {
    padding: 0.85rem;
  }

  .donation-address-box {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    padding: 0.65rem;
  }

  .donation-address-val {
    font-size: 0.725rem;
    text-align: center;
  }

  .btn-copy-address {
    width: 100%;
    height: 36px;
    justify-content: center;
  }

  .donation-qr-box svg {
    width: 105px;
    height: 105px;
  }

  .site-footer {
    padding: 3rem 0 1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 2.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer-bottom-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .header-actions {
    gap: 0.4rem;
  }

  .header-checkin-text {
    display: none;
  }

  #header-checkin-btn {
    padding: 0 0.55rem;
    height: 34px;
  }

  #header-signin-btn {
    padding: 0 0.65rem;
    font-size: 0.8rem;
    height: 34px;
  }

  #header-submit-btn {
    padding: 0 0.75rem;
    font-size: 0.8rem;
    height: 34px;
  }

  .mobile-toggle-btn {
    padding: 0.4rem;
  }
}