/* =========================================
   APP SHELL LAYOUT
   ========================================= */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  /* clip: sticky를 깨뜨리지 않으면서 가로 overflow 차단 */
  overflow-x: clip;
  /* 네이티브 위젯(select 등)이 항상 라이트 모드 색상(검정 글자)을 사용하도록 강제 */
  color-scheme: light;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--line-height);
  min-height: 100vh;
  overflow-x: clip;
  width: 100%;
  /* 하단 배너 광고 + 시스템 바 높이만큼 스크롤 여백 확보 */
  padding-bottom: var(--ad-bottom-offset, 0px);
}

/* App container: sidebar + main */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* =========================================
   SIDEBAR (PC only)
   ========================================= */

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-5) var(--space-3) var(--space-3);
}

.sidebar-section-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-4) var(--space-3) var(--space-2);
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  margin-bottom: 2px;
}

.sidebar-nav-item:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.sidebar-nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.sidebar-nav-item .nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-nav-item.active .nav-icon {
  opacity: 1;
}

.sidebar-group-list {
  margin-top: var(--space-1);
}

.sidebar-group-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  margin-bottom: 1px;
}

.sidebar-group-item:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.sidebar-group-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.sidebar-group-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidebar-group-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

/* =========================================
   MAIN CONTENT AREA
   ========================================= */

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-5) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.page-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  font-family: var(--font-headline);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.page-body {
  flex: 1;
  padding: var(--space-6) var(--space-8);
  max-width: calc(var(--content-max-width) + var(--space-8) * 2);
}

/* =========================================
   BOTTOM NAV (Mobile only — hidden on PC)
   ========================================= */

.bottom-nav {
  display: none;
  position: fixed;
  top: env(safe-area-inset-top);
  left: 0;
  right: 0;
  height: 56px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-bottom-nav);
  padding: 0;
}

.bottom-nav-inner {
  display: flex;
  height: 100%;
  align-items: stretch;
  overflow-x: auto;
  scrollbar-width: none;
}

.bottom-nav-inner::-webkit-scrollbar {
  display: none;
}

.bottom-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  border: none;
  background: none;
  min-width: 64px;
  position: relative;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  padding: 0 4px;
}

.bottom-nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full) var(--radius-full) 0 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.bottom-nav-item:active {
  background: var(--color-surface-2);
}

.bottom-nav-item.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.bottom-nav-item.active::after {
  opacity: 1;
}

.bottom-nav-icon {
  width: 20px;
  height: 20px;
  font-size: 18px;
  line-height: 1;
}

.bottom-nav-label {
  font-size: 10px;
  line-height: 1;
  white-space: nowrap;
}


/* =========================================
   TOAST CONTAINER
   ========================================= */

#toast-container {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
  width: max-content;
  max-width: calc(100vw - var(--space-8));
}

/* =========================================
   MODAL
   ========================================= */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  padding-bottom: calc(var(--space-4) + var(--ad-bottom-offset, 0px));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.modal-backdrop.visible {
  opacity: 1;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  max-height: calc(90vh - var(--ad-bottom-offset, 0px));
  overflow-y: auto;
  transform: scale(0.95) translateY(8px);
  transition: transform var(--transition-base);
}

.modal-backdrop.visible .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  line-height: 1;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.modal-close:hover {
  background: var(--color-border);
}

.modal-body {
  padding: var(--space-5) var(--space-6);
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

/* =========================================
   PAGE-LEVEL GRID HELPERS
   ========================================= */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-gap-2 { display: flex; align-items: center; gap: var(--space-2); }
.flex-gap-3 { display: flex; align-items: center; gap: var(--space-3); }
.flex-gap-4 { display: flex; align-items: center; gap: var(--space-4); }