/* ─── Google Fonts ─────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ─── Design tokens ─────────────────────────────────────────────────────────── */
:root {
  /* Brand */
  --accent:          #2563eb;
  --accent-hover:    #1d4ed8;
  --accent-subtle:   #eff6ff;

  /* Surfaces */
  --bg:              #f1f5f9;
  --surface:         #ffffff;
  --surface-raised:  #f8fafc;
  --border:          #e2e8f0;
  --border-strong:   #cbd5e1;

  /* Text */
  --text:            #0f172a;
  --text-muted:      #64748b;
  --text-faint:      #94a3b8;

  /* Semantic */
  --success:         #16a34a;
  --success-bg:      #f0fdf4;
  --danger:          #dc2626;
  --danger-bg:       #fef2f2;
  --danger-border:   #fca5a5;
  --warning:         #d97706;

  /* Misc */
  --radius-sm:       4px;
  --radius:          8px;
  --radius-lg:       12px;
  --shadow-sm:       0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow:          0 1px 3px 0 rgb(0 0 0 / 0.10), 0 1px 2px -1px rgb(0 0 0 / 0.10);
  --shadow-md:       0 4px 6px -1px rgb(0 0 0 / 0.10), 0 2px 4px -2px rgb(0 0 0 / 0.10);

  --nav-height:      56px;
  --transition:      150ms ease;
}

[data-theme="dark"] {
  --accent:          #3b82f6;
  --accent-hover:    #60a5fa;
  --accent-subtle:   #1e3a5f;

  --bg:              #0f172a;
  --surface:         #1e293b;
  --surface-raised:  #273548;
  --border:          #334155;
  --border-strong:   #475569;

  --text:            #f1f5f9;
  --text-muted:      #94a3b8;
  --text-faint:      #64748b;

  --success:         #4ade80;
  --success-bg:      #052e16;
  --danger:          #f87171;
  --danger-bg:       #450a0a;
  --danger-border:   #991b1b;

  --shadow-sm:       0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow:          0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.4);
  --shadow-md:       0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
}

/* ─── Reset & base ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

/* ─── Layout ─────────────────────────────────────────────────────────────────── */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 0;
}

.app-nav .nav-brand {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
  margin-right: 2rem;
  white-space: nowrap;
}

.app-nav .nav-links {
  display: flex;
  gap: 0.25rem;
  flex: 1;
  align-items: center;
}

.app-nav .nav-link {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.app-nav .nav-link:hover {
  color: var(--text);
  background: var(--surface-raised);
}

.app-nav .nav-link.active {
  color: var(--accent);
  background: var(--accent-subtle);
  font-weight: 600;
}

.theme-toggle {
  margin-left: auto;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

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

.app-main {
  flex: 1;
  padding: 1.75rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

/* ─── Page header ────────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.page-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* ─── Cards ──────────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card-body {
  padding: 1.25rem;
}

/* ─── Stat cards ─────────────────────────────────────────────────────────────── */
.stat-cards {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.stat-card {
  flex: 1 1 150px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-sm);
}

.stat-card__label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.stat-card__value {
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  line-height: 1.2;
}

/* ─── Month / Year nav ───────────────────────────────────────────────────────── */
.period-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.period-nav__label {
  font-size: 1.2rem;
  font-weight: 700;
  min-width: 170px;
  text-align: center;
  letter-spacing: -0.01em;
}

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  line-height: 1;
}

.btn:hover {
  background: var(--surface-raised);
  border-color: var(--border-strong);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger-bg);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: var(--surface-raised);
  color: var(--text);
  border-color: var(--border);
}

.btn-icon {
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-faint);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: color var(--transition), background var(--transition);
}

.btn-icon:hover {
  color: var(--danger);
  background: var(--danger-bg);
}

.btn-nav {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background var(--transition), color var(--transition);
}

.btn-nav:hover {
  background: var(--surface-raised);
  color: var(--text);
}

.btn-sm {
  padding: 0.3rem 0.65rem;
  font-size: 0.8rem;
}

/* ─── Forms ──────────────────────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-input,
.form-select {
  padding: 0.45rem 0.625rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.15);
}

.form-input::placeholder {
  color: var(--text-faint);
}

.form-error {
  font-size: 0.8rem;
  color: var(--danger);
  margin-top: 0.25rem;
}

/* ─── Tables ─────────────────────────────────────────────────────────────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table th {
  text-align: left;
  padding: 0.6rem 1rem;
  background: var(--surface-raised);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.data-table th.text-right,
.data-table td.text-right {
  text-align: right;
}

.data-table td {
  padding: 0.65rem 1rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background: var(--surface-raised);
}

.data-table tfoot tr td {
  border-top: 2px solid var(--border-strong);
  border-bottom: none;
  font-weight: 700;
  background: var(--surface-raised);
}

.data-table .row-muted td {
  color: var(--text-faint);
}

/* ─── Alerts ─────────────────────────────────────────────────────────────────── */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.alert-error {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  font-weight: 600;
}

/* ─── Badges ─────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-category {
  background: var(--surface-raised);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ─── Divider ────────────────────────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.75rem 0;
}

/* ─── Empty state ────────────────────────────────────────────────────────────── */
.empty-state {
  color: var(--text-faint);
  font-size: 0.875rem;
  font-style: italic;
  padding: 0.25rem 0;
}

/* ─── Paycheck grid ──────────────────────────────────────────────────────────── */
.paycheck-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 680px) {
  .paycheck-grid { grid-template-columns: 1fr; }
  .app-nav .nav-link { font-size: 0.8rem; padding: 0.35rem 0.5rem; }
}

.paycheck-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.paycheck-card__header {
  padding: 1rem 1.25rem 0.875rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-raised);
}

.paycheck-card__number {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.paycheck-card__date {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.paycheck-card__amounts {
  display: flex;
  gap: 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.paycheck-card__amounts strong {
  color: var(--text);
}

.paycheck-card__body {
  padding: 1rem 1.25rem;
}

.section-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 0.625rem;
}

/* Bill rows */
.bill-row {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

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

.bill-row__check {
  margin-top: 2px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
  width: 15px;
  height: 15px;
}

.bill-row__info { flex: 1; }

.bill-row__name {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  gap: 0.5rem;
}

.bill-row__name.paid {
  text-decoration: line-through;
  color: var(--text-faint);
}

.bill-row__amount {
  font-variant-numeric: tabular-nums;
  font-size: 0.875rem;
  white-space: nowrap;
}

.bill-row__meta {
  font-size: 0.75rem;
  color: var(--text-faint);
  display: flex;
  gap: 0.5rem;
  margin-top: 1px;
}

/* OTE rows */
.ote-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

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

.ote-row__check { accent-color: var(--accent); cursor: pointer; flex-shrink: 0; }

.ote-row__name {
  flex: 1;
  color: var(--text);
}

.ote-row__name.paid {
  text-decoration: line-through;
  color: var(--text-faint);
}

.ote-row__amount {
  font-variant-numeric: tabular-nums;
  color: var(--text);
  white-space: nowrap;
}

/* Actual rows */
.actual-row {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

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

.actual-row__main {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.actual-row__category {
  font-weight: 500;
  color: var(--text);
}

.actual-row__amount {
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.actual-row__meta {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-faint);
  margin-top: 1px;
}

.actual-row__note { font-style: italic; flex: 1; }

/* Inline add forms */
.inline-add-form {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.625rem;
  flex-wrap: wrap;
}

.inline-add-form .form-input {
  flex: 1;
  min-width: 80px;
}

/* Multi-row form */
.form-rows {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.form-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.form-row .form-input,
.form-row .form-select {
  flex: 1;
  min-width: 80px;
}

/* Remaining balance */
.remaining-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.75rem;
  margin-top: 0.75rem;
  border-top: 2px solid var(--border-strong);
}

.remaining-row__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.remaining-row__amount {
  font-size: 1.15rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.remaining-row__amount.positive { color: var(--success); }
.remaining-row__amount.negative { color: var(--danger); }

/* ─── Settings ───────────────────────────────────────────────────────────────── */
.settings-section {
  margin-bottom: 2rem;
}

.settings-section__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

/* ─── Utilities ──────────────────────────────────────────────────────────────── */
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-faint { color: var(--text-faint); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.font-tabular { font-variant-numeric: tabular-nums; }
.font-bold { font-weight: 700; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-sm { gap: 0.5rem; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }