/**
 * SyntaxArena Layout Architecture
 * Source of truth: docs/DESIGN_SYSTEM.md & docs/ARCHITECTURE.md
 */

/* ==========================================================================
   SKIP TO CONTENT (KEYBOARD ACCESSIBILITY)
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-4);
  font-weight: 700;
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ==========================================================================
   APPLICATION HEADER & NAVIGATION SHELL
   ========================================================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--bg-surface-base);
  border-bottom: 2px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

/* Brand Logo */
.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-primary);
}

.brand-link:hover {
  text-decoration: none;
}

.brand-badge {
  width: 38px;
  height: 38px;
  background-color: var(--color-neutral);
  border: 2px solid var(--color-primary-edge);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  box-shadow: var(--shadow-tactile-sm) var(--color-primary-edge);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.brand-link:hover .brand-badge {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.brand-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 900;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary) 40%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header Navigation Links */
.app-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-raised);
  text-decoration: none;
  border-color: var(--border-subtle);
}

.nav-link[aria-current="page"] {
  color: var(--color-primary);
  background-color: var(--bg-surface-raised);
  border-color: var(--color-primary-edge);
  box-shadow: var(--shadow-tactile-sm) var(--color-primary-edge);
}

.nav-icon {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  flex-shrink: 0;
}

/* User Controls / Header Right */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Profile Pill */
.profile-pill {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 10px;
  background-color: var(--bg-surface-raised);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-full);
  text-decoration: none;
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.profile-pill:hover {
  border-color: var(--color-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

.profile-avatar-mini {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background-color: var(--color-neutral);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

/* Quick Toggle Buttons */
.btn-icon-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-strong);
  background-color: var(--bg-surface-raised);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon-toggle:hover {
  color: var(--text-primary);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

/* ==========================================================================
   PAGE CONTAINER & MAIN CONTENT SHELL
   ========================================================================== */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.page-container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  flex: 1;
}

.page-header {
  margin-bottom: var(--space-8);
}

.page-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

.page-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* ==========================================================================
   APPLICATION FOOTER
   ========================================================================== */
.app-footer {
  margin-top: auto;
  background-color: var(--bg-surface-base);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-6) var(--space-4);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  gap: var(--space-4);
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   MOBILE NAVIGATION DRAWER (BATCH 3)
   ========================================================================== */
.btn-mobile-menu {
  display: none; /* Desktop default */
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-strong);
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-mobile-menu:hover {
  border-color: var(--color-primary);
}

.btn-mobile-menu:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.mobile-nav-drawer {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--bg-surface-base);
  border-bottom: 2px solid var(--border-strong);
  box-shadow: var(--shadow-elevation-modal);
  padding: var(--space-4);
  flex-direction: column;
  gap: var(--space-2);
  z-index: var(--z-sticky);
  animation: slideDown 0.2s ease-out;
}

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

.mobile-nav-drawer .nav-link {
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
}

@media (max-width: 820px) {
  .btn-mobile-menu {
    display: flex;
  }

  .header-container .app-nav {
    display: none; /* Hidden on tablet/mobile; available in drawer */
  }
}

/* ==========================================================================
   HERO GAMEPLAY PREVIEW CONTAINER
   ========================================================================== */
.hero-preview-container {
  position: relative;
  max-width: 760px;
  margin: 2.5rem auto 0;
  perspective: 1000px;
}

.hero-preview-card {
  background-color: var(--bg-surface-raised);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-elevation-card), 0 0 30px rgba(0, 229, 255, 0.12);
  overflow: hidden;
  text-align: left;
}

.hero-preview-header {
  background-color: var(--bg-surface-base);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero-preview-body {
  padding: var(--space-5);
}

.hero-preview-terminal {
  background-color: var(--bg-code-terminal);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  overflow-x: auto;
}

/* Smooth Scroll Section Anchor Offset */
.section-anchor {
  scroll-margin-top: 84px;
}