/* ===== layout.css — App shell, sidebar, mobile header, content area ===== */
/* Consolidated from sidebar.css + layout rules from style.css */

/* ===== Main Content Area ======================================== */

.app-main {
  padding: 24px 32px 48px;
  max-width: 1600px;
  margin: 0 auto;
}

.app-main > section {
  animation: fadeIn 0.2s ease;
}

.app-main > section.hidden {
  display: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Sidebar Navigation ====================================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 250px;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width 0.2s ease, transform 0.2s ease;
  overflow: hidden;
}

/* ===== Sidebar Brand =========================================== */

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.sidebar-logo svg {
  width: 36px;
  height: 36px;
}

.sidebar-brand-text h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  color: var(--sidebar-fg);
}

.sidebar-brand-text .hint {
  font-size: 0.75rem;
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--sidebar-fg-muted);
}

/* ===== Sidebar Navigation Items ================================ */

.sidebar-nav {
  flex: 1;
  padding: 8px;
  overflow-y: auto;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  text-decoration: none;
  color: var(--sidebar-fg-muted);
  font-weight: 500;
  font-size: 14px;
  border-radius: 8px;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  margin-bottom: 2px;
  min-height: 44px;
  box-sizing: border-box;
}

.sidebar-nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-nav-label {
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-nav-item:hover {
  color: var(--sidebar-fg);
  background: var(--sidebar-bg-hover);
}

.sidebar-nav-item:focus-visible {
  outline: 2px solid var(--sidebar-accent);
  outline-offset: 2px;
}

.sidebar-nav-item--active {
  color: var(--sidebar-accent);
  background: var(--sidebar-bg-active);
  border-left: 3px solid var(--sidebar-accent);
  padding-left: 9px;
}

/* ===== Sidebar External Links ================================== */

.sidebar-external-links {
  padding: 4px 8px 0;
  border-top: 1px solid var(--sidebar-border);
}

.sidebar-external-links .sidebar-nav-item {
  opacity: 0.75;
}

.sidebar-external-links .sidebar-nav-item:hover {
  opacity: 1;
}

/* ===== Sidebar Footer ========================================== */

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--sidebar-border);
}

.sidebar-actions {
  margin-bottom: 8px;
}

.sidebar-create-btn {
  width: 100%;
  justify-content: center;
  background: var(--sidebar-accent) !important;
  border-color: var(--sidebar-accent) !important;
  color: white !important;
}

.sidebar-create-btn:hover {
  filter: brightness(1.1);
}

.sidebar-user-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.sidebar-user-actions .btn--icon {
  color: var(--sidebar-fg-muted);
}

.sidebar-user-actions .btn--icon:hover {
  color: var(--sidebar-fg);
  background: var(--sidebar-bg-hover);
}

.sidebar-user-actions .btn--icon:focus-visible {
  outline-color: var(--sidebar-accent);
}

/* ===== Sidebar Version ========================================= */

.sidebar-version {
  text-align: center;
  font-size: 0.7rem;
  padding: 0.25rem 0;
  color: var(--sidebar-fg-muted);
}

/* ===== Sidebar Collapse Toggle ================================= */

.sidebar-collapse-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 8px 12px;
  margin-top: 8px;
  background: none;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--sidebar-fg-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 40px;
  box-sizing: border-box;
}

.sidebar-collapse-btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.sidebar-collapse-btn:hover {
  color: var(--sidebar-fg);
  background: var(--sidebar-bg-hover);
}

/* ===== Collapsed State ========================================= */

.sidebar.sidebar--collapsed {
  width: 60px;
}

.sidebar.sidebar--collapsed .sidebar-brand-text,
.sidebar.sidebar--collapsed .sidebar-nav-label,
.sidebar.sidebar--collapsed .sidebar-create-btn .btn-label,
.sidebar.sidebar--collapsed .sidebar-version {
  opacity: 0;
  width: 0;
  overflow: hidden;
}

.sidebar.sidebar--collapsed .sidebar-brand {
  justify-content: center;
  padding: 16px 8px 12px;
}

.sidebar.sidebar--collapsed .sidebar-nav-item {
  justify-content: center;
  padding: 10px 0;
}

.sidebar.sidebar--collapsed .sidebar-nav-item--active {
  padding-left: 0;
  border-left: none;
  border-bottom: 3px solid var(--sidebar-accent);
  padding-bottom: 7px;
}

.sidebar.sidebar--collapsed .sidebar-footer {
  padding: 8px;
}

.sidebar.sidebar--collapsed .sidebar-actions {
  display: none;
}

.sidebar.sidebar--collapsed .sidebar-user-actions {
  flex-direction: column;
  gap: 4px;
}

.sidebar.sidebar--collapsed .sidebar-collapse-btn {
  justify-content: center;
  padding: 8px 0;
}

.sidebar.sidebar--collapsed .sidebar-collapse-btn svg {
  transform: rotate(180deg);
}

/* Tooltip for collapsed nav items */
.sidebar.sidebar--collapsed .sidebar-nav-item {
  position: relative;
}

.sidebar.sidebar--collapsed .sidebar-nav-item::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--sidebar-bg-hover);
  color: var(--sidebar-fg);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--sidebar-border);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 200;
}

.sidebar.sidebar--collapsed .sidebar-nav-item:hover::after {
  opacity: 1;
}

/* ===== Main Content Offset ===================================== */

body:has(.sidebar:not(.hidden)) .app-main {
  margin-left: 250px;
  transition: margin-left 0.2s ease;
}

body:has(.sidebar.sidebar--collapsed:not(.hidden)) .app-main {
  margin-left: 60px;
}

/* ===== Mobile Header =========================================== */

.mobile-header {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
}

.mobile-header-logo {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.mobile-header-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
}

/* ===== Sidebar Overlay (mobile) ================================ */

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.sidebar-overlay.visible {
  opacity: 1;
}

/* ===== Responsive: Mobile ====================================== */

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.sidebar--open {
    transform: translateX(0);
    box-shadow: var(--shadow-soft);
  }

  /* On mobile, sidebar is not hidden via .hidden class when open */
  .sidebar:not(.hidden).sidebar--open {
    display: flex;
  }

  body:has(.sidebar:not(.hidden)) .app-main {
    margin-left: 0;
  }

  .mobile-header:not(.hidden) {
    display: flex;
  }

  .app-main {
    padding: 16px;
  }
}

/* ===== Reduced motion ========================================== */

@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .sidebar-overlay,
  .sidebar-collapse-btn svg,
  .app-main,
  .app-main > section {
    transition: none;
    animation: none;
  }
}

/* Hide collapse button on mobile (sidebar uses overlay instead) */
@media (max-width: 768px) {
  .sidebar-collapse-btn {
    display: none;
  }
}