/* ============================================================
   RESPONSIVE DESIGN (MOBILE / TABLET)
   ============================================================ */

@media (max-width: 768px) {

  header {
    flex-direction: column;
    align-items: flex-start;
  }

  header h1 {
    font-size: 1rem;
  }

  header img {
    height: 40px;
  }

  header nav {
    width: 100%;
  }

  .tab-nav {
    flex-direction: column;
    width: 100%;
  }

  .tab-nav button {
    width: 100%;
  }

  main {
    padding: 12px;
  }

  .lesson-card {
    padding: 15px;
  }

  

  
}


/* ============================================================
   PRINT STYLES (PDF ENGINE)
   ============================================================ */

@media print {

  /* Reset */
  html, body {
    height: auto !important;
  }

  * {
    overflow: visible !important;
  }

  body {
    background: white !important;
    display: block !important;
    font-size: 12pt;
    line-height: 1.6;
  }

  main {
    margin: 0 !important;
    padding: 0 !important;
    display: block !important;
  }

  #worksheet-container {
    display: block !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  /* Hide UI */
  header, nav, .tab-nav, button, footer, .no-print {
    display: none !important;
  }

  /* Show print elements */
  .print-only {
    display: block !important;
  }

  .student-info {
    display: flex !important;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 15px;
  }

  .print-only-header {
    display: block !important;
    margin-bottom: 20px;
  }

  /* Questions (print-safe 2-column) */
  .question-grid {
    display: block !important;
  }

  .question-item {
    width: 48%;
    display: inline-block;
    vertical-align: top;
    margin-bottom: 25px;

    page-break-inside: avoid;
    break-inside: avoid;
  }

  .math-q {
    font-size: 1.2rem;
    line-height: 1.8;
    color: black !important;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }

  /* Answer key */
  .answer-key-section {
    display: block !important;
    page-break-before: always;
    break-before: page;
  }

  .answer-grid {
    column-count: 2;
    column-gap: 30px;
  }

  .answer-grid div {
    break-inside: avoid;
    page-break-inside: avoid;
    margin-bottom: 10px;
  }
}


/* ============================================================
   PAGE SETUP
   ============================================================ */

@page {
  margin: 2cm 1.5cm;
}