/* =========================
   CSS RESET & VARIABLES
========================= */
:root {
    --bg: #ffffff;
    --text: #1b1b1b;
    --muted: #6b7280;
    --primary: #0f5132; /* Nigerian green */
    --card: #f9fafb;
    --border: #e5e7eb;
    --ad-bg: #f3f4f6;
  }
  
  [data-theme="dark"] {
    --bg: #0b0f14;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --primary: #22c55e;
    --card: #111827;
    --border: #1f2933;
    --ad-bg: #0f172a;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  html {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    scroll-behavior: smooth;
  }
  
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
  }
  
  /* =========================
     ACCESSIBILITY
  ========================= */
  .skip-link {
    position: absolute;
    left: -999px;
    top: auto;
  }
  .skip-link:focus {
    left: 1rem;
    top: 1rem;
    background: var(--primary);
    color: #fff;
    padding: 0.5rem;
    z-index: 1000;
  }
  
  /* =========================
     HEADER
  ========================= */
  .site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
  }
  
  .brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .logo {
    width: 48px;
    height: 48px;
  }
  
  .controls button {
    background: none;
    border: 1px solid var(--border);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    cursor: pointer;
  }
  
  /* =========================
     LAYOUT
  ========================= */
  .container {
    max-width: 720px;
    margin: auto;
    padding: 1rem;
  }
  
  .intro {
    margin-bottom: 1.5rem;
  }
  
  .card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1.5rem;
  }
  
  /* =========================
     FORM
  ========================= */
  .field {
    margin-bottom: 1rem;
  }
  
  label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
  }
  
  input,
  select {
    width: 100%;
    padding: 0.6rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
  }
  
  .expenses input {
    margin-top: 0.5rem;
  }
  
  .actions {
    text-align: right;
  }
  
  button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
  }
  
  /* =========================
     RESULTS
  ========================= */
  .results p {
    font-size: 1.1rem;
  }
  
  /* =========================
     ADS (NON-INTRUSIVE)
  ========================= */
  .ad-slot {
    background: var(--ad-bg);
    border: 1px dashed var(--border);
    border-radius: 8px;
    text-align: center;
    padding: 1rem;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    color: var(--muted);
  }
  
  /* =========================
     CONTENT & FAQ
  ========================= */
  .content ul {
    padding-left: 1.2rem;
  }
  
  .faq details {
    margin-bottom: 0.75rem;
  }
  
  .faq summary {
    cursor: pointer;
    font-weight: 600;
  }
  
  /* =========================
     FOOTER
  ========================= */
  .site-footer {
    text-align: center;
    padding: 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--muted);
  }

  /* =========================
   DYNAMIC EXPENSES POLISH
========================= */
.expense-row {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
  }
  
  .expense-row input[type="text"] {
    font-size: 0.9rem;
  }
  
  .expense-row button {
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--border);
    padding: 0.4rem 0.6rem;
  }
  
  #addExpense {
    margin-top: 0.75rem;
    background: none;
    color: var(--primary);
    border: 1px dashed var(--border);
    width: 100%;
  }
  
  /* Custom state input */
  #customState {
    margin-top: 0.5rem;
  }

  
  .result-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
  }
  
  .result-actions button {
    flex: 1;
    font-size: 0.9rem;
  }

  
  /* =========================
   PRINT STYLES
========================= */
@media print {
    body {
      background: #fff;
      color: #000;
    }
  
    .site-header,
    .ad-slot,
    .controls,
    #addExpense,
    .result-actions button:not(#printResults) {
      display: none;
    }
  
    .card {
      border: none;
      padding: 0;
    }
  
    footer {
      display: none;
    }
  }

.positive { color: #198754; }
.negative { color: #dc3545; }