:root {
    --navy:    #1A3A5C;
    --teal:    #1A6B6B;
    --orange:  #D4600A;
    --sky:     #4AACCC;
    --mint:    #3BBFA0;
    --coral:   #F07050;
    --yellow:  #F5C842;
    --purple:  #7B5EA7;
    --bg:      #F0F4FF;
    --card:    #FFFFFF;
    --text:    #1E2A3A;
    --muted:   #6B7A8D;
    --radius:  18px;
    --shadow:  0 8px 32px rgba(26,58,92,0.13);
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  body {
    font-family: 'Nunito', sans-serif;
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    overflow-x: hidden;
  }

  /* ── Animated background ── */
  body::before {
    content: '';
    position: fixed; inset: 0; z-index: 0;
    background:
      radial-gradient(ellipse at 10% 20%, rgba(74,172,204,0.18) 0%, transparent 50%),
      radial-gradient(ellipse at 90% 80%, rgba(59,191,160,0.15) 0%, transparent 50%),
      radial-gradient(ellipse at 50% 50%, rgba(245,200,66,0.08) 0%, transparent 60%);
    pointer-events: none;
  }

  .app-wrap {
    position: relative; z-index: 1;
    min-height: 100vh;
    display: flex; flex-direction: column; align-items: center;
    padding: 24px 16px 60px;
  }

  /* ── Header ── */
  .header {
    text-align: center;
    margin-bottom: 32px;
    animation: fadeDown 0.6s ease both;
  }
  .header-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--navy), var(--teal));
    color: #fff;
    font-size: 12px; font-weight: 800; letter-spacing: 2px;
    padding: 6px 18px; border-radius: 99px;
    margin-bottom: 12px; text-transform: uppercase;
  }
  .header h1 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(24px, 5vw, 38px);
    font-weight: 700; color: var(--navy);
    line-height: 1.2;
  }
  .header p {
    color: var(--muted); font-size: 15px; margin-top: 6px;
  }

  /* ── Cards ── */
  .card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 36px 40px;
    width: 100%; max-width: 680px;
    animation: fadeUp 0.5s ease both;
  }
  @media (max-width: 600px) { .card { padding: 24px 18px; } }

  /* ── Progress bar ── */
  .progress-wrap {
    width: 100%; max-width: 680px;
    margin-bottom: 20px;
    animation: fadeDown 0.5s ease both;
  }
  .progress-meta {
    display: flex; justify-content: space-between;
    font-size: 13px; font-weight: 700; color: var(--muted);
    margin-bottom: 8px;
  }
  .progress-bar-bg {
    background: #E2E8F0; border-radius: 99px; height: 10px; overflow: hidden;
  }
  .progress-bar-fill {
    height: 100%; border-radius: 99px;
    background: linear-gradient(90deg, var(--sky), var(--mint));
    transition: width 0.5s cubic-bezier(.4,0,.2,1);
  }

  /* ── Section: Student Details ── */
  .section-title {
    font-family: 'Poppins', sans-serif;
    font-size: 20px; font-weight: 700; color: var(--navy);
    margin-bottom: 6px;
  }
  .section-sub {
    color: var(--muted); font-size: 14px; margin-bottom: 28px;
  }

  .form-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  }
  @media (max-width: 520px) { .form-grid { grid-template-columns: 1fr; } }
  .form-grid .full { grid-column: 1 / -1; }

  .field { display: flex; flex-direction: column; gap: 6px; }
  .field label {
    font-size: 13px; font-weight: 800; color: var(--navy);
    letter-spacing: 0.5px; text-transform: uppercase;
  }
  .field input {
    padding: 12px 16px;
    border: 2px solid #E2E8F0;
    border-radius: 12px;
    font-family: 'Nunito', sans-serif;
    font-size: 15px; color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    background: #FAFBFF;
  }
  .field input:focus {
    border-color: var(--sky);
    box-shadow: 0 0 0 4px rgba(74,172,204,0.15);
  }
  .field input.error { border-color: var(--coral); }

  /* ── Question ── */
  .q-number {
    display: inline-flex; align-items: center; gap: 8px;
    margin-bottom: 16px;
  }
  .q-num-badge {
    background: linear-gradient(135deg, var(--orange), var(--coral));
    color: #fff; font-weight: 900; font-size: 13px;
    padding: 4px 14px; border-radius: 99px;
  }
  .q-type-tag {
    font-size: 12px; font-weight: 700; color: var(--muted);
    text-transform: uppercase; letter-spacing: 1px;
  }
  .q-text {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(16px, 3vw, 20px);
    font-weight: 600; color: var(--navy);
    line-height: 1.5; margin-bottom: 28px;
  }

  /* ── Options ── */
  .options { display: flex; flex-direction: column; gap: 12px; }

  .option-btn {
    display: flex; align-items: flex-start; gap: 16px;
    padding: 16px 20px;
    border: 2.5px solid #E2E8F0;
    border-radius: 14px;
    background: #FAFBFF;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    font-family: 'Nunito', sans-serif;
    width: 100%;
    position: relative; overflow: hidden;
  }
  .option-btn::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--sky), var(--mint));
    opacity: 0; transition: opacity 0.2s;
  }
  .option-btn:hover {
    border-color: var(--sky);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74,172,204,0.2);
  }
  .option-btn:hover::before { opacity: 0.05; }
  .option-btn.selected {
    border-color: var(--teal);
    background: linear-gradient(135deg, rgba(26,107,107,0.08), rgba(74,172,204,0.08));
    box-shadow: 0 4px 16px rgba(26,107,107,0.15);
  }
  .option-btn.selected .opt-letter {
    background: var(--teal); color: #fff;
  }

  .opt-letter {
    flex-shrink: 0;
    width: 34px; height: 34px;
    border-radius: 50%;
    background: #E8F4FF;
    display: flex; align-items: center; justify-content: center;
    font-weight: 900; font-size: 14px; color: var(--navy);
    transition: all 0.2s;
    position: relative; z-index: 1;
  }
  .opt-content { position: relative; z-index: 1; }
  .opt-label {
    font-size: 15px; font-weight: 700; color: var(--text);
    display: block; margin-bottom: 2px;
  }
  .opt-detail {
    font-size: 13px; color: var(--muted); font-style: italic;
  }

  /* For Q13–20: binary options get special colours */
  .option-btn.mpc-opt:hover  { border-color: var(--navy); }
  .option-btn.mpc-opt.selected {
    border-color: var(--navy);
    background: linear-gradient(135deg, rgba(26,58,92,0.08), rgba(26,58,92,0.04));
  }
  .option-btn.mpc-opt.selected .opt-letter { background: var(--navy); color: #fff; }
  .option-btn.bipc-opt:hover  { border-color: var(--teal); }
  .option-btn.bipc-opt.selected {
    border-color: var(--teal);
    background: linear-gradient(135deg, rgba(26,107,107,0.08), rgba(59,191,160,0.08));
  }
  .option-btn.bipc-opt.selected .opt-letter { background: var(--teal); color: #fff; }

  /* ── Navigation ── */
  .nav-row {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 32px; gap: 12px;
  }
  .btn {
    padding: 13px 32px; border-radius: 12px; border: none;
    font-family: 'Nunito', sans-serif; font-size: 15px; font-weight: 800;
    cursor: pointer; transition: all 0.2s ease;
    letter-spacing: 0.3px;
  }
  .btn-primary {
    background: linear-gradient(135deg, var(--navy), var(--teal));
    color: #fff; box-shadow: 0 4px 16px rgba(26,58,92,0.3);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,58,92,0.35); }
  .btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
  .btn-ghost {
    background: #EEF2F8; color: var(--navy);
  }
  .btn-ghost:hover { background: #E2E8F2; }
  .btn-danger {
    background: linear-gradient(135deg, var(--orange), var(--coral));
    color: #fff; box-shadow: 0 4px 16px rgba(212,96,10,0.3);
  }
  .btn-danger:hover { transform: translateY(-2px); }

  .warn-msg {
    font-size: 13px; font-weight: 700; color: var(--coral);
    animation: shake 0.4s ease;
  }
  @keyframes shake {
    0%,100%{transform:translateX(0)} 25%{transform:translateX(-6px)} 75%{transform:translateX(6px)}
  }

  /* ── Result Card ── */
  .result-header {
    text-align: center; margin-bottom: 32px;
  }
  .result-badge {
    display: inline-block;
    padding: 6px 20px; border-radius: 99px;
    font-size: 13px; font-weight: 800; letter-spacing: 1.5px;
    text-transform: uppercase; margin-bottom: 16px;
  }
  .result-badge.mpc  { background: var(--navy);  color: #fff; }
  .result-badge.bipc { background: var(--teal);  color: #fff; }
  .result-badge.border-case { background: var(--orange); color: #fff; }

  .result-group {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(42px, 10vw, 72px);
    font-weight: 700; line-height: 1;
    margin-bottom: 8px;
  }
  .result-group.mpc  { color: var(--navy); }
  .result-group.bipc { color: var(--teal); }
  .result-group.border-case { color: var(--orange); }

  .result-tagline {
    font-size: 16px; color: var(--muted); max-width: 420px; margin: 0 auto;
    line-height: 1.6;
  }

  .scores-row {
    display: flex; gap: 16px; margin: 28px 0; justify-content: center; flex-wrap: wrap;
  }
  .score-pill {
    flex: 1; min-width: 120px; max-width: 180px;
    background: #F0F4FF; border-radius: 14px;
    padding: 18px 20px; text-align: center;
  }
  .score-pill .score-label {
    font-size: 12px; font-weight: 800; text-transform: uppercase;
    letter-spacing: 1px; color: var(--muted); margin-bottom: 6px;
  }
  .score-pill .score-num {
    font-family: 'Poppins', sans-serif;
    font-size: 32px; font-weight: 700; line-height: 1;
  }
  .score-pill .score-den {
    font-size: 14px; color: var(--muted);
  }
  .score-pill.mpc-pill  .score-num { color: var(--navy); }
  .score-pill.bipc-pill .score-num { color: var(--teal); }
  .score-pill.stream-pill .score-num { color: var(--orange); font-size: 20px; }

  .stream-detail {
    background: linear-gradient(135deg, #F0F4FF, #E8F4F4);
    border-radius: 14px; padding: 20px 24px;
    margin-bottom: 20px; border-left: 4px solid var(--sky);
  }
  .stream-detail h4 {
    font-size: 14px; font-weight: 800; text-transform: uppercase;
    letter-spacing: 1px; color: var(--navy); margin-bottom: 6px;
  }
  .stream-detail p { font-size: 15px; color: var(--text); line-height: 1.6; }

  .result-note {
    background: linear-gradient(135deg, rgba(26,58,92,0.06), rgba(26,107,107,0.06));
    border-radius: 14px; padding: 20px 24px;
    font-size: 14px; color: var(--muted); line-height: 1.7;
    text-align: center;
  }
  .result-note strong { color: var(--navy); }

  .email-status {
    text-align: center; margin-top: 16px;
    font-size: 14px; font-weight: 700;
  }
  .email-status.sending { color: var(--sky); }
  .email-status.sent    { color: var(--mint); }
  .email-status.failed  { color: var(--coral); }

  /* ── Loading spinner ── */
  .spinner {
    width: 48px; height: 48px; border-radius: 50%;
    border: 5px solid #E2E8F0;
    border-top-color: var(--teal);
    animation: spin 0.8s linear infinite;
    margin: 40px auto;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  /* ── Decorative blobs ── */
  .blob {
    position: fixed; border-radius: 50%; filter: blur(60px);
    pointer-events: none; z-index: 0; opacity: 0.35;
  }
  .blob-1 { width:320px; height:320px; background:var(--sky);    top:-80px;  left:-80px; }
  .blob-2 { width:280px; height:280px; background:var(--mint);   bottom:-60px; right:-60px; }
  .blob-3 { width:200px; height:200px; background:var(--yellow); top:50%;  right:5%; }

  /* ── Animations ── */
  @keyframes fadeUp   { from{opacity:0;transform:translateY(24px)} to{opacity:1;transform:none} }
  @keyframes fadeDown { from{opacity:0;transform:translateY(-16px)} to{opacity:1;transform:none} }
  .fade-in { animation: fadeUp 0.4s ease both; }

  /* ── Confetti canvas ── */
  #confetti-canvas {
    position: fixed; inset: 0; pointer-events: none; z-index: 100;
  }