/* ═══════════════════════════════════════════
   MarketingOS — Layout System
   Grid, Sidebar, Header, Panels, Breakpoints
   ═══════════════════════════════════════════ */

/* ── App Shell ── */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--topbar-height) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
  min-height: 100vh;
  min-height: 100dvh;
  transition: grid-template-columns var(--transition-base);
}

.app-shell.ai-panel-open {
  grid-template-columns: var(--sidebar-width) 1fr var(--ai-panel-width);
  grid-template-areas:
    "sidebar topbar aipanel"
    "sidebar main   aipanel";
}

/* ── Sidebar ── */
.sidebar {
  grid-area: sidebar;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-4) 0;
  z-index: var(--z-sidebar);
  transition: width var(--transition-base);
  overflow: hidden;
}

.sidebar:hover {
  width: var(--sidebar-expanded);
}

.sidebar-logo {
  width: 100%;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-4);
  margin-bottom: var(--space-6);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-logo .logo-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
}

.sidebar-logo .logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  margin-left: var(--space-3);
  opacity: 0;
  transition: opacity var(--transition-fast);
  white-space: nowrap;
}

.sidebar:hover .logo-text {
  opacity: 1;
}

.sidebar-modules {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: 0 var(--space-3);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
  min-height: 48px;
}

.sidebar-item:hover {
  background: var(--bg-card-hover);
}

.sidebar-item.active {
  background: rgba(189, 255, 71, 0.08);
}

.sidebar-item.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 24px;
  background: var(--accent-lime);
  border-radius: var(--radius-full);
}

.sidebar-item-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all var(--transition-fast);
}

.sidebar-item.active .sidebar-item-icon {
  border-color: var(--accent-lime);
  box-shadow: var(--shadow-glow-lime);
}

.sidebar-item-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sidebar:hover .sidebar-item-label {
  opacity: 1;
}

.sidebar-item.active .sidebar-item-label {
  color: var(--accent-lime);
}

.sidebar-item .progress-mini {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-left: auto;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sidebar:hover .sidebar-item .progress-mini {
  opacity: 1;
}

.sidebar-bottom {
  width: 100%;
  padding: var(--space-4) var(--space-3);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* ── Topbar ── */
.topbar {
  grid-area: topbar;
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  height: var(--topbar-height);
  background: rgba(7, 7, 15, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  z-index: var(--z-topbar);
  transition: left var(--transition-base);
}

[data-theme="light"] .topbar {
  background: rgba(244, 244, 255, 0.85);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.topbar-breadcrumb .separator {
  color: var(--text-muted);
}

.topbar-center {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar-module-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

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

.xp-bar-container {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 180px;
}

.xp-bar-track {
  flex: 1;
  height: 8px;
  background: var(--bg-card);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border);
}

.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-violet), var(--accent-lime));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.xp-bar-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--accent-lime);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.level-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: rgba(123, 94, 255, 0.12);
  border: 1px solid rgba(123, 94, 255, 0.25);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--accent-violet);
  white-space: nowrap;
}

.ai-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.ai-toggle-btn:hover {
  border-color: var(--accent-violet);
  box-shadow: var(--shadow-glow-violet);
}

.ai-toggle-btn.active {
  background: var(--accent-violet);
  color: white;
}

.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
}

/* ── Main Content ── */
.main-content {
  grid-area: main;
  margin-top: var(--topbar-height);
  margin-left: var(--sidebar-width);
  padding: var(--space-8);
  min-height: calc(100vh - var(--topbar-height));
  transition: margin-left var(--transition-base);
}

.module-container {
  display: none;
  max-width: var(--content-max);
  margin: 0 auto;
  animation: fadeSlideUp 0.4s ease-out;
}

.module-container.active {
  display: block;
}

.module-header {
  margin-bottom: var(--space-10);
}

.module-header .module-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.module-header .module-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-2);
}

.module-header .module-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 60ch;
}

.module-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

/* ── AI Panel ── */
.ai-panel {
  position: fixed;
  right: -420px;
  top: var(--topbar-height);
  bottom: 0;
  width: var(--ai-panel-width);
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-slow);
}

.ai-panel.open {
  right: 0;
}

.ai-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border);
  min-height: 56px;
}

.ai-panel-header h3 {
  font-size: var(--text-base);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ai-panel-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.ai-panel-input {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border);
}

.ai-input-group {
  display: flex;
  gap: var(--space-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
}

.ai-input-group input {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  background: transparent;
  color: var(--text-primary);
}

.ai-input-group input::placeholder {
  color: var(--text-muted);
}

.ai-input-group button {
  padding: var(--space-2) var(--space-4);
  background: var(--accent-violet);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  transition: all var(--transition-fast);
}

.ai-input-group button:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

/* ── Onboarding Overlay ── */
.onboarding-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.5s ease-out;
}

.onboarding-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.onboarding-card {
  text-align: center;
  max-width: 480px;
  padding: var(--space-12);
  animation: scaleIn 0.6s var(--transition-spring);
}

.onboarding-card .onboarding-icon {
  font-size: 4rem;
  margin-bottom: var(--space-6);
  animation: float 3s ease-in-out infinite;
}

.onboarding-card h1 {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--accent-lime), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.onboarding-card p {
  color: var(--text-secondary);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  max-width: 100%;
}

.onboarding-input-wrapper {
  margin-bottom: var(--space-6);
}

.onboarding-input-wrapper input {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  background: var(--bg-card);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-lg);
  font-size: var(--text-lg);
  color: var(--text-primary);
  text-align: center;
  transition: border-color var(--transition-fast);
}

.onboarding-input-wrapper input:focus {
  border-color: var(--accent-lime);
  box-shadow: var(--shadow-glow-lime);
}

.onboarding-input-wrapper input::placeholder {
  color: var(--text-muted);
}

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

/* ── Bottom Nav (mobile) ── */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  z-index: var(--z-sidebar);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.bottom-nav-inner {
  display: flex;
  align-items: center;
  height: 100%;
  min-width: max-content;
  padding: 0 var(--space-2);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  height: 100%;
  padding: var(--space-2);
  gap: var(--space-1);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.bottom-nav-item .nav-icon {
  font-size: 1.25rem;
}

.bottom-nav-item .nav-label {
  font-size: 0.625rem;
  font-weight: var(--weight-medium);
  color: var(--text-muted);
  white-space: nowrap;
}

.bottom-nav-item.active .nav-label {
  color: var(--accent-lime);
}

.bottom-nav-item.active .nav-icon {
  transform: scale(1.1);
}

/* ═══════════════════════════════════════════
   Responsive Breakpoints
   ═══════════════════════════════════════════ */

/* ── Tablet: 768px – 1023px ── */
@media (max-width: 1023px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .main-content {
    padding: var(--space-6);
  }

  .ai-panel {
    width: 100%;
    right: auto;
    left: 0;
    top: auto;
    bottom: -100%;
    height: 60vh;
    border-left: none;
    border-top: 1px solid var(--border);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transition: bottom var(--transition-slow);
  }

  .ai-panel.open {
    bottom: 0;
  }

  .app-shell.ai-panel-open {
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-areas:
      "sidebar topbar"
      "sidebar main";
  }

  .topbar-center {
    display: none;
  }
}

/* ── Mobile: < 768px ── */
@media (max-width: 767px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-height) 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }

  .app-shell.ai-panel-open {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }

  .sidebar {
    display: none;
  }

  .bottom-nav {
    display: flex;
  }

  .topbar {
    left: 0;
    padding: 0 var(--space-4);
  }

  .topbar-left .topbar-breadcrumb {
    display: none;
  }

  .topbar-right .xp-bar-container {
    min-width: 100px;
  }

  .topbar-right .level-badge span:not(.level-icon) {
    display: none;
  }

  .main-content {
    margin-left: 0;
    padding: var(--space-4);
    padding-bottom: calc(64px + var(--space-4));
  }

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

  .module-header .module-title {
    font-size: var(--text-3xl);
  }

  .ai-panel {
    height: 80vh;
  }

  .onboarding-card {
    padding: var(--space-8) var(--space-4);
  }

  .onboarding-card h1 {
    font-size: var(--text-3xl);
  }

  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }
}

/* ── Wide: 1440px+ ── */
@media (min-width: 1440px) {
  .main-content {
    padding: var(--space-12);
  }

  .module-container {
    max-width: 1200px;
  }
}

/* ── Hamburger Menu ── */
.hamburger-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
}

@media (max-width: 767px) {
  .hamburger-btn {
    display: flex;
  }
}

/* ── Mobile Menu Overlay ── */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 7, 15, 0.9);
  backdrop-filter: blur(8px);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-menu-overlay.open {
  display: flex;
  opacity: 1;
}

.mobile-menu {
  width: 280px;
  height: 100%;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  animation: fadeSlideIn 0.3s ease-out;
}