/* ═══════════════════════════════════════════════════════
   RewardTalks Layout System
   ═══════════════════════════════════════════════════════ */

/* ── App Shell ── */
#app { min-height: 100vh; display: flex; flex-direction: column; }
#main-content { flex: 1; }

/* ── Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-height);
  /* backdrop-filter lives on ::before so it cannot create a containing block
     that would trap position:fixed mega-menu children */
}
.site-header::before {
  content: ''; position: absolute; inset: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-primary);
  z-index: -1; pointer-events: none;
}
[data-theme="dark"] .site-header::before { background: rgba(15,17,23,0.95); }

.header-inner {
  display: flex; align-items: center; height: 100%;
  max-width: var(--container-2xl); margin: 0 auto; padding: 0 var(--space-6);
}
.header-logo { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-xl); font-weight: 800; color: var(--text-primary); margin-right: var(--space-8); flex-shrink: 0; }
.header-logo .logo-reward { color: var(--brand-500); }
.header-logo .logo-talks { color: var(--text-primary); }
.header-logo svg, .header-logo img { height: 32px; width: auto; }

/* ── Main Nav ── */
.main-nav { display: flex; align-items: center; gap: 0; flex: 1; height: 100%; }
.nav-item {
  position: relative; height: 100%; display: flex; align-items: center;
  padding: 0 var(--space-4); font-size: var(--text-base); font-weight: 500;
  color: var(--text-secondary); cursor: pointer; white-space: nowrap;
  transition: color var(--transition-fast);
}
.nav-item:hover, .nav-item.active { color: var(--text-primary); }
.nav-item.active::after {
  content: ''; position: absolute; bottom: 0; left: var(--space-4); right: var(--space-4);
  height: 2px; background: var(--brand-500); border-radius: 1px;
}
.nav-item .nav-arrow { margin-left: 4px; font-size: 10px; transition: transform var(--transition-fast); }
.nav-item:hover .nav-arrow { transform: rotate(180deg); }

/* ── Mega Menu ── */
.mega-menu {
  /* position:fixed so left/right are viewport-relative, not nav-item-relative */
  position: fixed; top: var(--header-height); left: 0; right: 0; width: 100%;
  background: rgba(255,255,255,0.98); border-top: 1px solid var(--border-primary);
  box-shadow: var(--shadow-xl); padding: var(--space-8) 0;
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  pointer-events: none;
  transition: all var(--transition-base); z-index: 200;
}
[data-theme="dark"] .mega-menu { background: rgba(15,17,23,0.98); }
.mega-menu.open { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.mega-menu-inner { max-width: var(--container-2xl); margin: 0 auto; padding: 0 var(--space-6); display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-8); }
.mega-menu-section h4 { font-size: var(--text-sm); font-weight: 700; color: var(--text-primary); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: var(--space-3); padding-bottom: var(--space-2); border-bottom: 2px solid var(--brand-500); }
.mega-menu-link { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) 0; font-size: var(--text-base); color: var(--text-secondary); transition: all var(--transition-fast); border-radius: var(--radius-sm); }
.mega-menu-link:hover { color: var(--brand-500); padding-left: var(--space-2); }
.mega-menu-link .link-icon { width: 20px; text-align: center; opacity: 0.5; }

/* ── Header Right Actions ── */
.header-actions { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; }

/* ── Mobile Menu Toggle ── */
.mobile-menu-btn { display: none; padding: 8px; color: var(--text-primary); }
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .mobile-menu-btn { display: flex; }
}

/* ── Mobile Drawer ── */
.mobile-drawer {
  position: fixed; inset: 0; z-index: 500;
  visibility: hidden; opacity: 0; transition: all var(--transition-base);
}
.mobile-drawer.open { visibility: visible; opacity: 1; }
.mobile-drawer-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.5); }
.mobile-drawer-panel {
  position: absolute; top: 0; right: 0; width: 320px; max-width: 85vw;
  height: 100%; background: var(--bg-primary); overflow-y: auto;
  transform: translateX(100%); transition: transform var(--transition-slow);
  padding: var(--space-6);
}
.mobile-drawer.open .mobile-drawer-panel { transform: translateX(0); }
.mobile-drawer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-6); }
.mobile-nav-item { display: block; padding: var(--space-3) 0; font-size: var(--text-md); font-weight: 500; color: var(--text-secondary); border-bottom: 1px solid var(--border-primary); }
.mobile-nav-item:hover { color: var(--text-brand); }
.mobile-nav-group-title { padding: var(--space-4) 0 var(--space-2); font-size: var(--text-sm); font-weight: 700; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.06em; }
.mobile-nav-sub-item { display: block; padding: var(--space-2) 0 var(--space-2) var(--space-4); font-size: var(--text-base); color: var(--text-secondary); }

/* ── Footer ── */
.site-footer { background: var(--gray-900); color: var(--gray-400); padding: var(--space-16) 0 var(--space-8); }
[data-theme="dark"] .site-footer { background: #0A0C12; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(4, 1fr); gap: var(--space-10); margin-bottom: var(--space-12); }
.footer-brand { }
.footer-brand-name { font-size: var(--text-xl); font-weight: 800; color: white; margin-bottom: var(--space-3); }
.footer-brand-desc { font-size: var(--text-base); line-height: 1.6; color: var(--gray-400); max-width: 300px; }
.footer-column h5 { font-size: var(--text-sm); font-weight: 700; color: white; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: var(--space-4); }
.footer-link { display: block; padding: var(--space-1) 0; font-size: var(--text-base); color: var(--gray-400); transition: color var(--transition-fast); }
.footer-link:hover { color: white; }
.footer-bottom { border-top: 1px solid var(--gray-800); padding-top: var(--space-6); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-4); }
.footer-bottom-text { font-size: var(--text-sm); color: var(--gray-500); }
.footer-bottom-links { display: flex; gap: var(--space-4); }
.footer-bottom-links a { font-size: var(--text-sm); color: var(--gray-500); }
.footer-bottom-links a:hover { color: white; }

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ── Page Layouts ── */
.page-with-sidebar {
  display: flex; gap: var(--space-8); max-width: var(--container-2xl);
  margin: 0 auto; padding: var(--space-8) var(--space-6);
}
.page-main { flex: 1; min-width: 0; }
.page-sidebar { width: var(--sidebar-width); flex-shrink: 0; }

@media (max-width: 1024px) {
  .page-with-sidebar { flex-direction: column; }
  .page-sidebar { width: 100%; }
}

/* ── Grid Layouts ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--space-6); }

@media (max-width: 1024px) { .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; } }

/* ── Utility Flex ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ── Spacing Utilities ── */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }

/* ── Text Utilities ── */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md { font-size: var(--text-md); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-brand { color: var(--text-brand); }
.text-white { color: white; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ── Visibility ── */
.hidden { display: none !important; }
@media (max-width: 768px) { .hide-mobile { display: none !important; } }
@media (min-width: 769px) { .hide-desktop { display: none !important; } }

/* ── Dividers ── */
.divider { height: 1px; background: var(--border-primary); margin: var(--space-6) 0; }