/* ─── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-tertiary: #e8e8ed;
  --border: #d2d2d7;
  --border-strong: #b0b0b8;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #aeaeb2;
  --accent: #1d1d1f;
  --accent-hover: #3d3d3f;
  --danger: #ff3b30;
  --danger-hover: #d63028;
  --success: #34c759;
  --warning: #ff9f0a;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --transition: 0.18s ease;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  --nav-h: 56px;
}

/* ─── Reset ──────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font-family: var(--font); cursor: pointer; }
input, select, textarea { font-family: var(--font); }

/* ─── Layout ─────────────────────────────────────────────────────────────────── */
.page { display: none !important; }
.page.active { display: block !important; }
.page.active.auth-page { display: flex !important; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.main-content {
  padding-top: calc(var(--nav-h) + 32px);
  padding-bottom: 48px;
  min-height: 100vh;
}

/* ─── Navigation ─────────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
  cursor: pointer;
  border: none;
  background: none;
}
.nav-link:hover { color: var(--text); background: var(--bg-secondary); }
.nav-link.active { color: var(--text); background: var(--bg-tertiary); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-user {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ─── Buttons ─────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 980px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  transition: background var(--transition), opacity var(--transition), transform var(--transition);
  cursor: pointer;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; pointer-events: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-tertiary); }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}
.btn-danger:hover { background: var(--danger); color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: none;
}
.btn-ghost:hover { color: var(--text); background: var(--bg-secondary); }

.btn-sm {
  padding: 5px 12px;
  font-size: 13px;
}

.btn-icon {
  padding: 8px;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover { background: var(--bg-secondary); color: var(--text); }
.btn-icon.danger:hover { background: #fff0ef; color: var(--danger); }

/* ─── Form Elements ──────────────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.form-group:last-child { margin-bottom: 0; }

label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(29,29,31,0.08);
}
input.error, select.error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(255,59,48,0.1);
}

.field-error {
  font-size: 12px;
  color: var(--danger);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}
.checkbox-row label {
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
}

/* ─── Cards ──────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.budget-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
}
.budget-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  border-color: var(--border-strong);
}

.budget-card-name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 6px;
  color: var(--text);
}

.budget-card-amount {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  color: var(--text);
}

.budget-card-meta {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.budget-card-delete {
  position: absolute;
  top: 12px;
  right: 12px;
  opacity: 0;
  transition: opacity var(--transition);
}
.budget-card:hover .budget-card-delete { opacity: 1; }

.budget-card-current {
  border-color: var(--text);
  box-shadow: 0 0 0 1px var(--text), var(--shadow);
}
.budget-card-current:hover {
  box-shadow: 0 0 0 1px var(--text), var(--shadow-lg);
}

.budget-card-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  background: var(--text);
  color: #fff;
  padding: 3px 8px;
  border-radius: 99px;
  margin-bottom: 10px;
}

.td-overbudget {
  color: var(--danger);
  font-weight: 600;
}
.td-warning {
  color: var(--warning);
  font-weight: 500;
}

/* ─── Progress Bar ───────────────────────────────────────────────────────────── */
.progress-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 12px;
}
.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-secondary);
}
.progress-bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--text);
  border-radius: 99px;
  transition: width 0.4s ease;
}
.progress-fill.success { background: var(--success); }
.progress-fill.warning { background: var(--warning); }
.progress-fill.danger { background: var(--danger); }

/* ─── Page Header ────────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.page-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ─── Table ──────────────────────────────────────────────────────────────────── */
.table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead { background: var(--bg-secondary); }

th {
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: middle;
}

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

tbody tr { transition: background var(--transition); }
tbody tr:hover { background: var(--bg-secondary); }

.td-actions {
  display: flex;
  gap: 4px;
  justify-content: flex-end;
}

/* Expandable rows */
.tr-expandable { cursor: pointer; }
.tr-sub {
  background: var(--bg-secondary);
}
.tr-sub td {
  padding: 0;
  border-bottom: 1px solid var(--border);
}
.tr-sub-inner {
  padding: 0 16px 16px 40px;
}
.tr-sub-inner table {
  font-size: 13px;
}
.tr-sub-inner thead { background: var(--bg-tertiary); }
.tr-sub-inner th { font-size: 11px; padding: 8px 12px; }
.tr-sub-inner td { padding: 10px 12px; }

.chevron {
  display: inline-block;
  transition: transform var(--transition);
  font-size: 11px;
  color: var(--text-secondary);
  margin-right: 6px;
}
.chevron.open { transform: rotate(90deg); }

/* ─── Badges ─────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 500;
}
.badge-neutral { background: var(--bg-tertiary); color: var(--text-secondary); }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger  { background: #fee2e2; color: #991b1b; }

/* ─── Stat Grid ──────────────────────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.stat-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--text);
}

.stat-sub {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ─── Modal ──────────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  transform: scale(0.96) translateY(8px);
  transition: transform 0.22s ease;
}
.modal-overlay.open .modal { transform: scale(1) translateY(0); }

.modal-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 22px;
}

/* ─── Auth Pages ─────────────────────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  padding: 24px;
}

.auth-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.auth-logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.4px;
  margin-bottom: 6px;
  text-align: center;
}

.auth-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 28px;
}

.auth-footer {
  margin-top: 20px;
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
}
.auth-footer a {
  color: var(--text);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}

.auth-error {
  background: #fff0ef;
  border: 1px solid #ffd0cc;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  color: var(--danger);
  margin-bottom: 16px;
}

/* ─── Year Tabs ──────────────────────────────────────────────────────────────── */
.year-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.year-tab {
  padding: 6px 16px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: transparent;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.year-tab:hover { background: var(--bg-secondary); color: var(--text); }
.year-tab.active {
  background: var(--text);
  color: #fff;
  border-color: var(--text);
}

/* ─── Pagination ─────────────────────────────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  margin-top: 24px;
}

.page-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.page-num:hover { background: var(--bg-secondary); color: var(--text); }
.page-num.active {
  background: var(--text);
  color: #fff;
  border-color: var(--text);
}

/* ─── Empty State ────────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-secondary);
}
.empty-state-icon {
  font-size: 40px;
  margin-bottom: 12px;
  opacity: 0.4;
}
.empty-state-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.empty-state-desc {
  font-size: 14px;
  max-width: 300px;
  margin: 0 auto 20px;
}

/* ─── Toast ──────────────────────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--text);
  color: #fff;
  padding: 12px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.22s ease, toastOut 0.22s ease 2.8s forwards;
  max-width: 320px;
}
.toast.error {
  background: var(--danger);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(8px) scale(0.95); }
}

/* ─── Back link ──────────────────────────────────────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  transition: color var(--transition);
}
.back-link:hover { color: var(--text); }

/* ─── Section heading ─────────────────────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.section-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.2px;
}

/* ─── Divider ────────────────────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

/* ─── Loading spinner ────────────────────────────────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 14px;
}

/* ─── Profile ─────────────────────────────────────────────────────────────────── */
.profile-field {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  gap: 16px;
}
.profile-field:last-child { border-bottom: none; }
.profile-field-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  min-width: 140px;
}
.profile-field-value {
  font-size: 15px;
  color: var(--text);
  flex: 1;
  text-align: right;
}
.profile-field-value.empty { color: var(--text-tertiary); font-style: italic; }

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .form-row { grid-template-columns: 1fr; }
  .page-header { flex-direction: column; align-items: flex-start; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .modal { padding: 22px 18px; }
  .auth-card { padding: 28px 20px; }
  .container { padding: 0 16px; }
  .table-wrap { border-radius: var(--radius-sm); overflow-x: auto; }
  table { min-width: 600px; }
}