/* =============================================================================
   Layout - Header, Grid, Responsive Structure
   ============================================================================= */

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

/* Grid Systems */
.grid-responsive {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-responsive {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-responsive {
    grid-template-columns: repeat(3, 1fr);
  }
}

.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);
}

@media (max-width: 767px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Header Layout */
.header {
  background: var(--bg);
  border-bottom: 1px solid #E5E7EB;
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  box-shadow: var(--shadow);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  min-height: 64px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--success));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
}

/* Navigation */
.nav-links {
  display: none;
  gap: var(--space-4);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-links a:hover {
  background: var(--hover);
  color: var(--primary);
}

.nav-links a.active {
  background: var(--primary);
  color: var(--bg);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

/* Progress Bar Layout */
.progress-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.progress-bar::-webkit-scrollbar {
  display: none;
}

.progress-segment {
  flex-shrink: 0;
  width: var(--progress-segment-size);
  height: var(--progress-segment-size);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
}

.progress-segment.notstarted {
  background: var(--status-notstarted);
  color: var(--muted);
  border: 2px solid transparent;
}

.progress-segment.inprogress {
  background: var(--bg);
  color: var(--status-inprogress);
  border: 2px solid var(--status-inprogress);
}

.progress-segment.complete {
  background: var(--status-complete);
  color: var(--bg);
  border: 2px solid var(--status-complete);
}

.progress-segment.complete::after {
  content: '✓';
  position: absolute;
  font-size: var(--text-xs);
}

.progress-segment:hover {
  transform: scale(1.1);
}

/* Page Layout */
.page-header {
  background: var(--bg-soft);
  padding: var(--space-12) 0 var(--space-8);
  text-align: center;
}

.page-title {
  margin-bottom: var(--space-4);
}

.page-subtitle {
  color: var(--muted);
  font-size: var(--text-lg);
  max-width: 60ch;
  margin: 0 auto;
}

.main-content {
  padding: var(--space-8) 0;
  min-height: 60vh;
}

/* Footer Layout */
.footer {
  background: var(--bg-soft);
  border-top: 1px solid #E5E7EB;
  padding: var(--space-8) 0;
  margin-top: var(--space-20);
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  justify-content: center;
}

.footer-links a {
  color: var(--muted);
  font-size: var(--text-sm);
  font-weight: 500;
}

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

@media (min-width: 768px) {
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* Sidebar Layout */
.sidebar-layout {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .sidebar-layout {
    grid-template-columns: 1fr 300px;
  }
}

.sidebar-layout.reverse {
  grid-template-columns: 300px 1fr;
}

.sidebar {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: var(--space-6);
  height: fit-content;
  position: sticky;
  top: calc(64px + var(--space-4));
}

/* Mobile Navigation */
.mobile-nav {
  display: block;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--ink);
  font-size: var(--text-2xl);
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none;
  }
}

.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid #E5E7EB;
  box-shadow: var(--shadow);
  z-index: var(--z-dropdown);
  padding: var(--space-4);
  transform: translateY(-100%);
  transition: transform var(--duration-normal) var(--ease-out);
}

.mobile-menu.open {
  transform: translateY(0);
}

.mobile-menu .nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--ink);
  color: var(--bg);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
  z-index: var(--z-modal);
  transition: top var(--duration-normal) var(--ease-out);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Responsive Utilities */
.show-mobile {
  display: block;
}

.show-tablet,
.show-desktop {
  display: none;
}

@media (min-width: 768px) {
  .show-mobile {
    display: none;
  }
  
  .show-tablet {
    display: block;
  }
}

@media (min-width: 1024px) {
  .show-tablet {
    display: none;
  }
  
  .show-desktop {
    display: block;
  }
}