/* ── Variables & Reset ── */
:root {
  --primary: #1a1a2e;
  --accent: #4f46e5;
  --gold: #c9a84c;
  --success: #2e7d32;
  --error: #c62828;
  --bg: #f8f9ff;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #1a1a2e;
  --text-muted: #666;
  --locked-bg: rgba(255,255,255,0.7);
  --input-bg: #fff;
  --hover-bg: #f8fafc;
  --header-bg: #1a1a2e;
  --header-text: #ffffff;
  --badge-pass-bg: #e8f5e9;
  --badge-fail-bg: #ffebee;
  --option-hover: #eef2ff;
  --retry-bg: #eef2ff;
}
[data-theme="dark"] {
  --primary: #f8fafc;
  --accent: #6366f1;
  --success: #4ade80;
  --error: #f87171;
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --locked-bg: rgba(30, 41, 59, 0.8);
  --input-bg: #0f172a;
  --hover-bg: #334155;
  --header-bg: #1e293b;
  --header-text: #f1f5f9;
  --badge-pass-bg: rgba(74, 222, 128, 0.2);
  --badge-fail-bg: rgba(248, 113, 113, 0.2);
  --option-hover: #334155;
  --retry-bg: rgba(99, 102, 241, 0.1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}
.hidden { display: none !important; }

/* ── Typography & Container ── */
.container { padding: 16px; margin: 0 auto; }
h1, h2, h3 { margin-bottom: 10px; color: var(--text); font-weight: 700; }
.subtitle { color: var(--text-muted); font-size: 15px; margin-bottom: 20px; }

/* ── UI Components ── */
.card {
  background: var(--card);
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.12); }
.center-card { text-align: center; }

.input-field {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  margin-bottom: 15px;
  outline: none;
  transition: all 0.2s;
  background: var(--input-bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
}
.input-field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}
.input-label { display: block; font-weight: 600; margin-bottom: 8px; color: var(--text); font-size: 14px; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border: none;
  border-radius: 10px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-outline { background: transparent; border: 2px solid var(--accent); color: var(--accent); padding: 10px 22px; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-large { padding: 16px 24px; font-size: 16px; }

/* ── Screen Transitions ── */
.screen { animation: fadeIn 0.3s ease-in-out; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Toasts ── */
#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toast {
  padding: 14px 20px;
  border-radius: 10px;
  color: white;
  font-weight: 500;
  font-size: 14px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  animation: slideIn 0.3s ease-out;
  display: flex;
  align-items: center;
  gap: 10px;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--error); }
.toast-info { background: var(--accent); }
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ── Dashboard Header & Modules ── */
.dash-header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 16px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.dash-header .logo { font-size: 20px; font-weight: 700; }
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
  margin-top: 20px;
}
.module-card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.module-card:hover { transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0,0,0,0.12); }
.module-card.locked::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--locked-bg);
  backdrop-filter: blur(3px);
  z-index: 10;
}
.lock-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 11;
  color: var(--text-muted);
  font-weight: 600;
}
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
}
.badge-pass { background: var(--badge-pass-bg); color: var(--success); }
.badge-fail { background: var(--badge-fail-bg); color: var(--error); }

/* ── Exam Topbar & Questions ── */
.exam-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--header-bg);
  color: var(--header-text);
  padding: 15px 24px;
  font-weight: 600;
  font-size: 15px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.question-text { font-size: 20px; font-weight: 600; margin-bottom: 25px; line-height: 1.5; color: var(--text); }
.option-btn {
  background: var(--card);
  border: 2px solid var(--border);
  color: var(--text);
  width: 100%;
  padding: 16px 20px;
  margin: 10px 0;
  font-size: 16px;
  border-radius: 12px;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
}
.option-btn:hover:not(:disabled) { background: var(--option-hover); border-color: var(--accent); }
.option-btn:disabled { cursor: not-allowed; }
.option-btn.correct { background: var(--success); color: #fff; border-color: var(--success); font-weight: 700; }
.option-btn.chosen-wrong { background: #f59e0b; color: #fff; border-color: #f59e0b; font-weight: 700; }
.option-btn.wrong { background: var(--error); color: #fff; border-color: var(--error); }

.reason-box {
  background: var(--bg);
  border-left: 4px solid #f0a500;
  padding: 15px;
  border-radius: 8px;
  margin: 20px 0;
  font-size: 15px;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.6;
}
.retry-banner {
  background: var(--retry-bg);
  border-left: 4px solid var(--accent);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 15px;
  color: var(--accent);
  font-weight: 600;
}

/* ── Result Tables & Stats ── */
.result-stats {
  display: flex;
  gap: 15px;
  margin: 20px 0;
  flex-wrap: wrap;
  justify-content: center;
}
.stat-box {
  flex: 1;
  min-width: 120px;
  background: var(--bg);
  border-radius: 12px;
  padding: 15px;
  text-align: center;
  border: 1px solid var(--border);
}
.stat-box .stat-label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 5px; font-weight: 500; }
.stat-box .stat-value { font-size: 24px; font-weight: 800; color: var(--text); }

.table-wrapper { overflow-x: auto; border-radius: 12px; border: 1px solid var(--border); }
.result-table { width: 100%; border-collapse: collapse; font-size: 14px; text-align: left; }
.result-table th { background: var(--bg); color: var(--text); padding: 14px; font-weight: 600; }
.result-table td { padding: 14px; border-top: 1px solid var(--border); vertical-align: middle; }
.result-table tr:hover td { background: var(--hover-bg); }

/* ── Modal Overlay (Share, etc.) ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  backdrop-filter: blur(4px);
}
.modal-overlay.hidden { display: none !important; }
.modal-card {
  width: 100%;
  max-width: 420px;
  text-align: center;
  position: relative;
  animation: fadeIn 0.2s ease;
}
.modal-close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.modal-close-btn:hover { background: var(--border); }

/* ── Certificate Redesign ── */
#screen-certificate {
  overflow-y: auto;
  min-height: 100vh;
}
#screen-certificate > .container {
  padding-bottom: 40px;
}
#cert-container {
  width: 1122px;
  height: 794px;
  background-color: #fffaf0;
  background-image: radial-gradient(circle at center, #ffffff 40%, transparent 100%), repeating-linear-gradient(45deg, rgba(200,168,76,0.03) 0, rgba(200,168,76,0.03) 1px, transparent 1px, transparent 10px);
  position: relative;
  transform-origin: top left;
  box-sizing: border-box;
  flex-shrink: 0;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}
.cert-outer-border {
  border: 4px solid #1a1a2e;
  outline: 14px solid #c9a84c;
  outline-offset: -20px;
  height: 100%;
  padding: 60px;
  position: relative;
  box-sizing: border-box;
}
.spinner {
  border: 3px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top: 3px solid white;
  width: 18px;
  height: 18px;
  animation: spin 1s linear infinite;
  display: inline-block;
  vertical-align: middle;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* ── Print Media ── */
@media print {
  @page { size: A4 landscape; margin: 8mm; }
  * {
    -webkit-print-color-adjust: exact !important;
    color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  body { margin: 0; padding: 0; background: #fff !important; }
  /* Hide everything except the certificate screen */
  .screen, .modal-overlay { display: none !important; }
  #screen-certificate {
    display: block !important;
    position: fixed;
    inset: 0;
    overflow: visible;
    background: #fff !important;
  }
  .cert-actions { display: none !important; }
  #cert-responsive-wrapper {
    width: 100% !important;
    height: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
    background: transparent !important;
    border-radius: 0 !important;
    overflow: visible !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    min-height: unset !important;
  }
  #cert-scale-wrapper {
    transform: none !important;
    margin: 0 !important;
    width: auto !important;
    height: auto !important;
  }
  #cert-container {
    width: 260mm !important;
    height: 178mm !important;
    transform: none !important;
    box-shadow: none !important;
    page-break-inside: avoid !important;
    break-inside: avoid !important;
    background-color: #fffaf0 !important;
    background-image:
      radial-gradient(circle at center, #ffffff 40%, transparent 100%),
      repeating-linear-gradient(45deg, rgba(200,168,76,0.03) 0, rgba(200,168,76,0.03) 1px, transparent 1px, transparent 10px) !important;
  }
  .cert-outer-border {
    border: 3px solid #1a1a2e !important;
    outline: 10px solid #c9a84c !important;
    outline-offset: -14px !important;
    height: 100% !important;
    padding: 28px 48px !important;
    box-sizing: border-box !important;
    position: relative !important;
  }
  #cert-display-title { font-size: 28px !important; letter-spacing: 4px !important; }
  #cert-name { font-size: 30px !important; }
  #cert-module { font-size: 17px !important; }
  #cert-score { font-size: 22px !important; }
  img { max-width: 100% !important; height: auto !important; }
}

/* ── Mobile Optimization ── */
@media (max-width: 768px) {
  body { font-size: 16px; }
  .container { padding: 12px; }
  .card { padding: 20px 16px; border-radius: 12px; }

  /* Touch-friendly buttons */
  .btn { min-height: 48px; padding: 14px 20px; font-size: 15px; border-radius: 12px; }
  .btn-sm { min-height: 40px; padding: 8px 14px; font-size: 13px; }
  .btn-large { min-height: 52px; padding: 16px 20px; font-size: 16px; }

  /* Forms */
  .input-field { padding: 15px 16px; font-size: 16px; border-radius: 12px; min-height: 48px; }
  .input-label { font-size: 14px; margin-bottom: 8px; }

  /* Dashboard header stacks vertically */
  .dash-header {
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px;
    align-items: stretch;
  }
  .dash-header > div:last-child {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px;
  }
  .dash-header .logo { font-size: 18px; text-align: center; }

  /* Modules single column */
  .module-grid { grid-template-columns: 1fr; gap: 14px; margin-top: 14px; }
  .module-card { padding: 18px; }

  /* Exam */
  .exam-topbar { flex-direction: column; gap: 6px; text-align: center; padding: 12px 16px; font-size: 13px; }
  .question-text { font-size: 17px; line-height: 1.45; margin-bottom: 18px; }
  .option-btn { padding: 16px 18px; margin: 7px 0; font-size: 15px; border-radius: 12px; min-height: 52px; display: flex; align-items: center; }

  /* Result */
  .result-stats { flex-direction: column; gap: 10px; }
  .stat-box { padding: 14px; min-height: 70px; display: flex; flex-direction: column; justify-content: center; align-items: center; }
  .stat-value { font-size: 26px; }

  /* Tables scroll on mobile */
  .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .result-table { font-size: 12px; min-width: 550px; }
  .result-table th, .result-table td { padding: 10px 8px; white-space: nowrap; }

  /* Certificate actions — 2x2 grid on mobile */
  .cert-actions {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    padding: 0 4px;
    margin-bottom: 14px;
  }
  .cert-actions .btn { width: 100%; min-height: 46px; font-size: 14px; padding: 12px 8px; }

  /* Certificate wrapper: scrollable, tight padding */
  #cert-responsive-wrapper {
    padding: 8px !important;
    border-radius: 8px !important;
    overflow-x: auto !important;
  }

  /* Admin panel */
  #admin-panel > div { flex-direction: column; align-items: stretch !important; gap: 12px; }
  #admin-panel input[type="number"] { max-width: none; width: 100%; }

  /* Modal */
  .modal-card { margin: 0 8px; }
  #share-qr { width: 150px !important; height: 150px !important; }

  /* Toast at bottom on mobile */
  #toast-container { bottom: 20px; top: auto; right: 12px; left: 12px; }
}

/* Extra small screens */
@media (max-width: 480px) {
  .container { padding: 8px; }
  .card { padding: 14px 12px; }
  .btn { font-size: 14px; }
  .question-text { font-size: 15px; }
  .option-btn { font-size: 14px; padding: 14px 14px; }
  .stat-value { font-size: 22px; }
  /* Certificate: single column actions */
  .cert-actions { grid-template-columns: 1fr 1fr; gap: 8px; }
  .cert-actions .btn { font-size: 13px; padding: 10px 6px; }
}