/* ===================================================
   Family Finance App - Apple Design System
   =================================================== */

/* 1. CSS Variables */
:root {
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
                 "Helvetica Neue", Arial, sans-serif;

  /* Colors - Apple Palette */
  --bg:           #F5F5F7;
  --surface:      #FFFFFF;
  --surface-2:    #F5F5F7;
  --border:       #D2D2D7;
  --border-light: #E8E8ED;

  --text-primary:   #1D1D1F;
  --text-secondary: #6E6E73;
  --text-tertiary:  #AEAEB2;

  --blue:        #0071E3;
  --blue-hover:  #0077ED;
  --blue-light:  #E8F1FB;
  --green:       #30D158;
  --green-light: #E3F9EA;
  --red:         #FF453A;
  --red-light:   #FFEEED;
  --orange:      #FF9F0A;
  --orange-light:#FFF4E3;
  --purple:      #BF5AF2;
  --purple-light:#F5EBFE;
  --gray:        #6E6E73;
  --gray-light:  #F2F2F7;

  /* Sidebar */
  --sidebar-width: 240px;
  --sidebar-bg:    #FFFFFF;
  --sidebar-border:#E8E8ED;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  40px;
  --space-2xl: 64px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-xs: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.14);

  /* Transitions */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. Reset + Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body {
  font-family: var(--font-system);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

/* 3. Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

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

.app-main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  min-height: 100vh;
  padding: var(--space-xl);
  max-width: 1280px;
}

/* 4. Sidebar */
.sidebar-logo {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-light);
}

.sidebar-logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.sidebar-logo-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.sidebar-nav {
  padding: var(--space-md) 0;
  flex: 1;
}

.sidebar-section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-md) var(--space-lg) var(--space-xs);
  display: block;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 9px var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 400;
  border-radius: 0;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.sidebar-link:hover {
  background: var(--gray-light);
  color: var(--text-primary);
  text-decoration: none;
}

.sidebar-link.active {
  background: var(--blue-light);
  color: var(--blue);
  font-weight: 500;
}

.sidebar-link .icon {
  width: 20px;
  height: 20px;
  opacity: 0.7;
  flex-shrink: 0;
}

.sidebar-link.active .icon {
  opacity: 1;
}

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

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.sidebar-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 600;
  flex-shrink: 0;
}

.sidebar-user-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-user-role {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* 5. Page Header */
.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  gap: var(--space-md);
}

.page-header > *:first-child {
  min-width: 0;
  max-width: 100%;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.1;
  overflow-wrap: break-word;
}

.page-subtitle {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* 6. Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--border-light);
  padding: var(--space-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.card-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* 7. Stat Cards (Dashboard) */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.stat-value.positive { color: var(--green); }
.stat-value.negative { color: var(--red); }
.stat-value.blue     { color: var(--blue); }

.stat-change {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
}

/* 8. Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px var(--space-md);
  font-family: var(--font-system);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary {
  background: var(--blue);
  color: #FFFFFF;
}
.btn-primary:hover {
  background: var(--blue-hover);
  color: #FFFFFF;
  text-decoration: none;
}

.btn-secondary {
  background: var(--gray-light);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background: var(--border);
  color: var(--text-primary);
  text-decoration: none;
}

.btn-danger {
  background: var(--red-light);
  color: var(--red);
}
.btn-danger:hover {
  background: var(--red);
  color: #fff;
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--blue);
  padding: 6px var(--space-sm);
}
.btn-ghost:hover {
  background: var(--blue-light);
  text-decoration: none;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 14px var(--space-xl);
  font-size: 1rem;
  border-radius: var(--radius-md);
}

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-sm);
}

/* 9. Formulare */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px var(--space-md);
  font-family: var(--font-system);
  font-size: 0.9375rem;
  color: var(--text-primary);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0,113,227,0.15);
}

.form-input::placeholder { color: var(--text-tertiary); }
.form-textarea { resize: vertical; min-height: 80px; }

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236E6E73' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-md);
}

.form-hint {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.form-error {
  font-size: 0.8125rem;
  color: var(--red);
  margin-top: 4px;
}

/* 10. Tabellen */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

thead th {
  background: var(--surface-2);
  padding: 10px var(--space-md);
  text-align: left;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition);
}

tbody tr:last-child { border-bottom: none; }

tbody tr:hover { background: var(--surface-2); }

tbody td {
  padding: 12px var(--space-md);
  color: var(--text-primary);
  vertical-align: middle;
}

.td-right { text-align: right; }
.td-center { text-align: center; }

/* 11. Alerts / Flash Messages */
.alert {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  margin-bottom: var(--space-lg);
}

.alert-success {
  background: var(--green-light);
  color: #1a7a38;
  border: 1px solid rgba(48,209,88,0.3);
}

.alert-error {
  background: var(--red-light);
  color: #c0392b;
  border: 1px solid rgba(255,69,58,0.3);
}

.alert-info {
  background: var(--blue-light);
  color: #0055b3;
  border: 1px solid rgba(0,113,227,0.3);
}

/* 12. Badges / Tags */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 500;
  white-space: nowrap;
}

.badge-green  { background: var(--green-light);  color: #1a7a38; }
.badge-red    { background: var(--red-light);    color: #c0392b; }
.badge-blue   { background: var(--blue-light);   color: #0055b3; }
.badge-orange { background: var(--orange-light); color: #c07000; }
.badge-gray   { background: var(--gray-light);   color: var(--text-secondary); }
.badge-purple { background: var(--purple-light); color: #7b2fbe; }

/* 13. Amount Colors */
.text-green    { color: var(--green); font-weight: 500; }
.text-red      { color: var(--red);   font-weight: 500; }
.text-blue     { color: var(--blue);  font-weight: 500; }
.text-secondary { color: var(--text-secondary); }
.text-tertiary  { color: var(--text-tertiary); }

/* 14. Grid System */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

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

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

/* 15. Account Card (Konto-Kacheln) */
.account-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.account-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.account-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.account-card-type {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.account-card-name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.account-card-balance {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.account-card-bank {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* 16. Transaction List */
.transaction-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
}

.transaction-item:last-child { border-bottom: none; }

.transaction-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.transaction-info { flex: 1; min-width: 0; }

.transaction-desc {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.transaction-meta {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.transaction-amount {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

/* 17. Chart Container */
.chart-container {
  position: relative;
  height: 280px;
}

/* 18. Upload Area */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--surface-2);
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--blue);
  background: var(--blue-light);
}

.upload-icon { font-size: 3rem; margin-bottom: var(--space-md); }

.upload-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.upload-hint {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* 19. Progress Bar */
.progress {
  height: 6px;
  background: var(--border-light);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  border-radius: var(--radius-pill);
  background: var(--blue);
  transition: width 0.4s ease;
}

.progress-bar.green  { background: var(--green); }
.progress-bar.red    { background: var(--red); }
.progress-bar.orange { background: var(--orange); }

/* 20. Login Page */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}

.login-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2xl);
  width: 100%;
  max-width: 420px;
}

.login-logo {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.login-logo-icon {
  width: 64px;
  height: 64px;
  background: var(--blue);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  font-size: 2rem;
}

.login-title {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-align: center;
  color: var(--text-primary);
}

.login-subtitle {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 4px;
}

/* 21. Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  color: var(--text-secondary);
}

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

.empty-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

/* 22. Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-xl);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* 23. Tab Navigation */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--gray-light);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: var(--space-lg);
}

.tab {
  flex: 1;
  padding: 8px var(--space-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 6px;
  border: none;
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  text-decoration: none;
}

.tab.active {
  background: var(--surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-xs);
}

/* 24. Loan / Property Summary */
.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
}

.summary-row:last-child { border-bottom: none; }

.summary-label {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.summary-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* 25. Color Dot */
.color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

/* 26. Net Worth Bar */
.net-worth-bar {
  display: flex;
  height: 12px;
  border-radius: var(--radius-pill);
  overflow: hidden;
  gap: 2px;
  margin: var(--space-md) 0;
}

.net-worth-bar-segment {
  transition: flex var(--transition);
}

/* 27. Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: var(--space-lg);
}

.pagination-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition);
}

.pagination-btn:hover { background: var(--gray-light); text-decoration: none; }
.pagination-btn.active { background: var(--blue); color: #fff; border-color: var(--blue); }
.pagination-btn.disabled { opacity: 0.4; pointer-events: none; }

/* 28. Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.breadcrumb a { color: var(--blue); }
.breadcrumb-sep { color: var(--text-tertiary); }

/* 29. Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filter-input {
  flex: 1;
  min-width: 200px;
  padding: 9px var(--space-md);
  font-family: var(--font-system);
  font-size: 0.9375rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  outline: none;
}

.filter-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0,113,227,0.15);
}

/* 30. Utilities */
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }

.flex           { display: flex; }
.flex-col       { flex-direction: column; }
.items-center   { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm         { gap: var(--space-sm); }
.gap-md         { gap: var(--space-md); }

.text-right  { text-align: right; }
.text-center { text-align: center; }
.font-bold   { font-weight: 700; }
.font-medium { font-weight: 500; }

.w-full  { width: 100%; }
.hidden  { display: none; }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 31. Mobile */
.mobile-menu-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(0,0,0,.12);
  color: var(--text-primary);
  transition: box-shadow var(--transition);
}
.mobile-menu-btn:active { box-shadow: 0 1px 4px rgba(0,0,0,.1); }

.mobile-menu-btn .hamburger-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform .25s ease, opacity .2s ease;
}
.mobile-menu-btn.active .hamburger-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.active .hamburger-bar:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active .hamburger-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(1px);
  z-index: 150;
  opacity: 0;
  transition: opacity .25s ease;
}
.sidebar-overlay.open { display: block; opacity: 1; }

@media (max-width: 1024px) {
  .app-sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 160;
    transform: translateX(-100%);
    transition: transform .25s ease;
    display: flex;
  }
  .app-sidebar.open { transform: translateX(0); }
  .app-main { margin-left: 0; padding: var(--space-lg); padding-top: calc(var(--space-lg) + 44px); }
  .mobile-menu-btn { display: flex; align-items: center; justify-content: center; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-grid-2, .form-grid-3 { grid-template-columns: 1fr; }
  .page-title { font-size: 1.5rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .app-main { padding: var(--space-md); padding-top: calc(var(--space-md) + 44px); }
}