/* layout.css — Navigation, page layout, grid systems, responsive breakpoints */

/* ===== TOP NAVIGATION ===== */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-6);
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.top-nav__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.top-nav__brand:hover { color: #fff; }

.top-nav__flag {
  display: flex;
  flex-direction: column;
  width: 24px;
  height: 16px;
  border-radius: 2px;
  overflow: hidden;
  flex-shrink: 0;
}
.top-nav__flag-top { background: #fff; flex: 1; }
.top-nav__flag-bottom { background: var(--red); flex: 1; }

.top-nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.top-nav__link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--ease);
  white-space: nowrap;
}
.top-nav__link:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
}
.top-nav__link.active {
  color: #fff;
  background: rgba(255,255,255,0.15);
}
.top-nav__link .icon {
  font-size: 1rem;
}

/* Quiz dropdown */
.top-nav__dropdown {
  position: relative;
}
.top-nav__dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--sp-2);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  min-width: 200px;
  padding: var(--sp-2);
  z-index: 1001;
}
.top-nav__dropdown:hover .top-nav__dropdown-menu,
.top-nav__dropdown.open .top-nav__dropdown-menu {
  display: block;
}
.top-nav__dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 10px 14px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: background var(--ease);
}
.top-nav__dropdown-item:hover {
  background: var(--bg-alt);
  color: var(--text);
}
.top-nav__dropdown-item .icon { font-size: 1rem; }

/* Mobile hamburger */
.top-nav__hamburger {
  display: none;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}
.top-nav__hamburger:hover {
  background: rgba(255,255,255,0.1);
}

/* Mobile nav overlay */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 999;
}
.mobile-nav-overlay.active {
  display: block;
}

.mobile-nav {
  position: fixed;
  top: 0;
  right: -280px;
  width: 280px;
  height: 100%;
  background: var(--card-bg);
  z-index: 1001;
  transition: right 0.3s ease;
  padding: var(--sp-6);
  padding-top: calc(var(--nav-height) + var(--sp-4));
  overflow-y: auto;
}
.mobile-nav.active {
  right: 0;
}
.mobile-nav__link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 12px var(--sp-4);
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background var(--ease);
  margin-bottom: var(--sp-1);
}
.mobile-nav__link:hover, .mobile-nav__link.active {
  background: var(--bg-alt);
  color: var(--red);
}
.mobile-nav__divider {
  height: 1px;
  background: var(--border);
  margin: var(--sp-3) 0;
}
.mobile-nav__label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: var(--sp-2) var(--sp-4);
}

/* ===== BREADCRUMBS ===== */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-4) 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
}
.breadcrumbs a:hover { color: var(--red); }
.breadcrumbs .sep { color: var(--text-muted); }
.breadcrumbs .current { color: var(--text); font-weight: 500; }

/* ===== PAGE HEADER ===== */
.page-header {
  padding: var(--sp-8) 0 var(--sp-6);
}
.page-header h1 {
  margin-bottom: var(--sp-2);
}
.page-header p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin: 0;
}

/* ===== GRID LAYOUTS ===== */
.grid {
  display: grid;
  gap: var(--sp-6);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--auto-sm { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* ===== FLEX LAYOUTS ===== */
.flex { display: flex; }
.flex--wrap { flex-wrap: wrap; }
.flex--center { align-items: center; justify-content: center; }
.flex--between { justify-content: space-between; }
.flex--gap-2 { gap: var(--sp-2); }
.flex--gap-3 { gap: var(--sp-3); }
.flex--gap-4 { gap: var(--sp-4); }

/* ===== FILTER BAR ===== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--sp-6);
  flex-wrap: wrap;
}
.filter-bar .input,
.filter-bar .select {
  flex: 1;
  min-width: 150px;
}

/* ===== TABLES ===== */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--sp-4) 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th {
  background: var(--navy);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
}
td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
tr:last-child td { border-bottom: none; }
tr:nth-child(even) { background: var(--bg-alt); }

[data-theme="dark"] th { background: var(--navy-light); }

/* ===== RESPONSIVE BREAKPOINTS ===== */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  /* Navigation: hide desktop links, show hamburger */
  .top-nav__links { display: none; }
  .top-nav__hamburger { display: flex; }

  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .filter-bar .input,
  .filter-bar .select {
    min-width: 100%;
  }

  .table-wrap { font-size: 0.85rem; }
}

@media (max-width: 480px) {
  .grid--4 { grid-template-columns: 1fr; }
  .grid--auto { grid-template-columns: 1fr; }

  .breadcrumbs { font-size: 0.8rem; }

  .page-header { padding: var(--sp-5) 0 var(--sp-4); }
}