/* ============================================================
   MAIN - Layout, Grid, Typography
   ============================================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  min-height: 100vh;
}

/* --- App Shell --- */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Header --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  height: var(--header-height);
  padding: 0 var(--space-6);
  background: var(--bg-primary);
  border-bottom: var(--border-width) solid var(--border-color);
  box-shadow: var(--shadow-sm);
  gap: var(--space-6);
}

.app-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-decoration: none;
  white-space: nowrap;
}

.app-header__logo-icon {
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
}

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

.tab-nav__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-nav__item:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.tab-nav__item--active {
  color: var(--accent);
  background: var(--accent-light);
}

.tab-nav__count {
  font-size: var(--font-size-xs);
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.tab-nav__item--active .tab-nav__count {
  background: var(--accent);
  color: var(--accent-text);
}

/* --- Header Actions --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-size-md);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* --- Sync Button --- */
.sync-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  position: relative;
}

.sync-btn__icon {
  font-size: 14px;
  line-height: 1;
}

.sync-btn__label {
  font-size: 13px;
}

.sync-btn--connected {
  color: var(--success, #2b8a3e) !important;
  border-color: var(--success, #2b8a3e) !important;
}

.sync-btn--connected:hover {
  background: rgba(43, 138, 62, 0.08);
}

.sync-settings-btn {
  font-size: 16px;
  padding: 4px 6px !important;
  min-width: 32px;
  color: var(--text-secondary, #888);
}

.sync-settings-btn:hover {
  color: var(--text-primary);
}

/* --- Sync Dropdown Menu --- */
.sync-menu {
  z-index: 10001;
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border-color, #ddd);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  min-width: 200px;
  padding: 4px;
  animation: syncMenuIn 0.15s ease;
}

@keyframes syncMenuIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.sync-menu__user {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-secondary, #666);
  border-bottom: 1px solid var(--border-color, #eee);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sync-menu__item {
  display: block;
  width: 100%;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-primary, #333);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s;
}

.sync-menu__item:hover {
  background: var(--bg-hover, #f5f5f5);
}

.sync-menu__item--danger {
  color: var(--error, #e03131);
}

.sync-menu__item--danger:hover {
  background: rgba(224, 49, 49, 0.06);
}

/* --- Main Content --- */
.app-main {
  flex: 1;
  padding: var(--space-6);
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
}

/* --- Tab Panels --- */
.tab-panel {
  display: none;
}

.tab-panel--active {
  display: block;
  animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Page Headers --- */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}

.page-header__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.page-header__subtitle {
  font-size: var(--font-size-base);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

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

/* --- Empty States --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.empty-state__text {
  font-size: var(--font-size-base);
  max-width: 400px;
  margin-bottom: var(--space-6);
}

/* --- Sticky Footer (Estimate Totals) --- */
.sticky-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  display: none;
  align-items: center;
  justify-content: space-between;
  height: var(--footer-height);
  padding: 0 var(--space-6);
  background: var(--bg-primary);
  border-top: var(--border-width) solid var(--border-color);
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
}

.sticky-footer--visible {
  display: flex;
}

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

.sticky-footer__stat {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.sticky-footer__label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sticky-footer__value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.sticky-footer__value--grand {
  font-size: var(--font-size-xl);
  color: var(--accent);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* --- Toast Container --- */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  animation: slideInRight var(--transition-base);
  max-width: 360px;
}

.toast--success { border-left: 3px solid var(--success); }
.toast--error { border-left: 3px solid var(--danger); }
.toast--warning { border-left: 3px solid var(--warning); }
.toast--info { border-left: 3px solid var(--info); }

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}

/* --- Utility Classes --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-mono { font-family: var(--font-mono); }
.tabular-nums { font-variant-numeric: tabular-nums; }

/* Round 2 B1: hide native number-input spinners (UX preference). */
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type=number] { -moz-appearance: textfield; appearance: textfield; }