/* =============================================
   APP LAYOUT — Sidebar, Topbar, Content
   ============================================= */

/* --- App shell --- */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 50;
  overflow-y: auto;
  transition: transform 0.3s cubic-bezier(0.16,1,0.3,1);
}

.sidebar__logo {
  padding: var(--space-5) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--sidebar-border);
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
}
.sidebar__logo svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}
.sidebar__logo span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
}

.sidebar__nav {
  flex: 1;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.sidebar__item:hover {
  background: var(--sidebar-hover);
  color: var(--color-text);
}
.sidebar__item.active {
  background: var(--sidebar-active);
  color: var(--color-primary);
  font-weight: 600;
}
.sidebar__item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar__section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-4) var(--space-4) var(--space-2);
}

.sidebar__sub {
  padding-left: var(--space-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.sidebar__sub .sidebar__item {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.sidebar__bottom {
  padding: var(--space-3);
  border-top: 1px solid var(--sidebar-border);
}

.sidebar__user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.sidebar__user:hover { background: var(--sidebar-hover); }
.sidebar__avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-xs);
  flex-shrink: 0;
}
.sidebar__user-info { overflow: hidden; }
.sidebar__user-name { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.sidebar__user-role { font-size: var(--text-xs); color: var(--color-text-faint); }

/* --- Main area --- */
.app-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-topbar {
  height: var(--topbar-height);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: 40;
}

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

.app-topbar__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.app-topbar__breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.app-topbar__breadcrumb a:hover { color: var(--color-text); }
.app-topbar__breadcrumb span.current { color: var(--color-text); font-weight: 500; }

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

.topbar-burger {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.topbar-burger:hover { background: var(--color-surface-2); color: var(--color-text); }

.app-content {
  flex: 1;
  padding: var(--space-6);
  max-width: 1200px;
  width: 100%;
}

/* Full-width content (for AI chat etc.) */
.app-content--full {
  max-width: none;
  padding: 0;
}

/* --- Auth layout (login/register) --- */
.auth-layout {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: var(--color-bg);
}
.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-2xl);
  padding: var(--space-10) var(--space-8);
  box-shadow: var(--shadow-lg);
}
.auth-card--wide { max-width: 560px; }
.auth-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-8);
  cursor: pointer;
}
.auth-logo svg { width: 32px; height: 32px; }
.auth-logo span { font-family: var(--font-display); font-weight: 700; font-size: var(--text-xl); }
.auth-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-2);
}
.auth-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-8);
}
.auth-footer {
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.auth-footer a { color: var(--color-primary); font-weight: 600; text-decoration: none; }
.auth-footer a:hover { text-decoration: underline; }

/* --- Scenario cards (register) --- */
.scenario-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.scenario-card {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.scenario-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.scenario-card.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}
.scenario-card svg {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--color-primary);
}
.scenario-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.scenario-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Mobile sidebar */
@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-100%);
    z-index: 100;
  }
  .sidebar.open { transform: translateX(0); }
  .app-main { margin-left: 0; }
  .topbar-burger { display: flex; }
  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
    display: none;
  }
  .sidebar-overlay.open { display: block; }

  /* Page header stacks */
  .page-header {
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
  }

  /* Stat grid stacks */
  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }

  /* App content padding */
  .app-content {
    padding: var(--space-4);
  }
}

@media (max-width: 600px) {
  /* Landing hero stacks */
  .public-layout [style*="grid-template-columns:1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }

  /* Pricing cards stack */
  .public-content [style*="grid-template-columns:repeat(3"] {
    grid-template-columns: 1fr !important;
  }

  /* Auth scenario cards */
  .scenario-cards {
    grid-template-columns: 1fr;
  }

  /* Connector grid */
  .connector-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    flex-direction: column;
  }
}

/* --- Public pages layout --- */
.public-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.public-header {
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-wide);
  margin: 0 auto;
  width: 100%;
}
.public-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  color: var(--color-text);
}
.public-header__logo svg { width: 28px; height: 28px; }
.public-header__logo span { font-family: var(--font-display); font-weight: 700; font-size: var(--text-lg); }
.public-header__actions { display: flex; align-items: center; gap: var(--space-3); }
.public-content {
  flex: 1;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-6);
  width: 100%;
}