:root {
    --mint: #d4f0e8;
    --teal: #2d9e7e;
    --teal-dark: #1e7a60;
    --peach: #fde8d8;
    --warm: #f9f4ef;
    --text: #2c3e35;
    --muted: #7a9b8e;
    --white: #ffffff;
    --shadow: 0 4px 24px rgba(45,158,126,0.10);
    --radius: 16px;
  }

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

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

  header {
    background: var(--white);
    border-bottom: 2px solid var(--mint);
    padding: 18px 32px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 2px 12px rgba(45,158,126,0.07);
  }

  .logo-dot { width: 32px; height: 32px; background: var(--teal); border-radius: 50% 50% 50% 8px; display: flex; align-items: center; justify-content: center; }
  .logo-dot span { color: white; font-size: 16px; }
  .logo-text { font-family: 'Playfair Display', serif; font-size: 20px; color: var(--teal-dark); font-weight: 700; }
  .logo-sub { font-size: 11px; color: var(--muted); font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; margin-top: -2px; }

  .hero {
    background: linear-gradient(135deg, var(--mint) 0%, var(--peach) 100%);
    padding: 48px 32px 36px;
    text-align: center;
  }
  .hero h1 { font-family: 'Playfair Display', serif; font-size: 2rem; color: var(--teal-dark); margin-bottom: 8px; }
  .hero p { color: var(--muted); font-size: 1rem; max-width: 520px; margin: 0 auto; line-height: 1.7; }

  .container { max-width: 780px; margin: 0 auto; padding: 36px 20px 60px; overflow-x: hidden; }

  .card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px;
    margin-bottom: 24px;
  }

  .card-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    color: var(--teal-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }

  @media (max-width: 580px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.5rem; }
  }

  .field { display: flex; flex-direction: column; gap: 6px; }
  .field label { font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }

  select, input[type="text"] {
    width: 100%;
    padding: 11px 14px;
    border: 2px solid var(--mint);
    border-radius: 10px;
    font-family: 'Nunito', sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--warm);
    outline: none;
    transition: border-color 0.2s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%232d9e7e' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
  }

  select:focus, input[type="text"]:focus { border-color: var(--teal); background: white; }

  .checkboxes { display: flex; flex-direction: column; gap: 10px; }
  .check-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border: 2px solid var(--mint);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--warm);
  }
  .check-item:hover { border-color: var(--teal); background: var(--mint); }
  .check-item input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--teal); cursor: pointer; }
  .check-item span { font-size: 14px; font-weight: 600; color: var(--text); }
  .check-item small { font-size: 11px; color: var(--muted); margin-left: auto; }

  .btn-generate {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-family: 'Nunito', sans-serif;
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
    letter-spacing: 0.5px;
    transition: all 0.2s;
    box-shadow: 0 4px 16px rgba(45,158,126,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
  }
  .btn-generate:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(45,158,126,0.35); }
  .btn-generate:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

  .loading-bar {
    display: none;
    background: var(--mint);
    border-radius: 8px;
    height: 6px;
    overflow: hidden;
    margin-top: 16px;
  }
  .loading-bar.active { display: block; }
  .loading-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--teal), var(--peach), var(--teal));
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
    width: 100%;
  }
  @keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }

  .loading-text {
    display: none;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    margin-top: 10px;
  }
  .loading-text.active { display: block; }

  /* Output */
  #output-section { display: none; }
  #output-section.visible { display: block; animation: fadeUp 0.4s ease; }
  @keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

  .output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
  }
  .output-title { font-family: 'Playfair Display', serif; font-size: 1.1rem; color: var(--teal-dark); }

  .btn-group { display: flex; gap: 10px; }

  .btn-sm {
    padding: 8px 16px;
    border-radius: 8px;
    font-family: 'Nunito', sans-serif;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    border: 2px solid var(--teal);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .btn-outline { background: white; color: var(--teal); }
  .btn-outline:hover { background: var(--mint); }
  .btn-filled { background: var(--teal); color: white; }
  .btn-filled:hover { background: var(--teal-dark); }

  .worksheet-output {
    background: white;
    border: 2px solid var(--mint);
    border-radius: var(--radius);
    padding: 32px;
    font-size: 14px;
    line-height: 1.9;
    color: var(--text);
    min-height: 200px;
  }
  .worksheet-output h1, .worksheet-output h2, .worksheet-output h3 {
    font-family: 'Playfair Display', serif;
    color: var(--teal-dark);
    margin: 16px 0 8px;
  }
  .worksheet-output h1 { font-size: 1.3rem; text-align: center; }
  .worksheet-output h2 { font-size: 1.1rem; }
  .worksheet-output h3 { font-size: 1rem; }
  .worksheet-output p { margin-bottom: 10px; }
  .worksheet-output strong { color: var(--teal-dark); }
  .worksheet-output hr { border: none; border-top: 2px dashed var(--mint); margin: 20px 0; }
  .worksheet-output ol, .worksheet-output ul { padding-left: 24px; margin-bottom: 12px; }
  .worksheet-output li { margin-bottom: 8px; }
  .worksheet-output .answer-key { background: var(--mint); border-radius: 10px; padding: 16px 20px; margin-top: 20px; }
  .worksheet-output table { width: 100%; border-collapse: collapse; margin: 12px 0; }
  .worksheet-output td, .worksheet-output th { border: 1px solid var(--mint); padding: 8px 12px; }
  .worksheet-output th { background: var(--mint); font-weight: 700; }

  .error-msg {
    background: #fff0f0;
    border: 2px solid #fca5a5;
    border-radius: 10px;
    padding: 14px 18px;
    color: #b91c1c;
    font-size: 13px;
    display: none;
    margin-top: 12px;
  }
  .error-msg.visible { display: block; }

  .badge {
    display: inline-block;
    background: var(--mint);
    color: var(--teal-dark);
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.5px;
  }

  @media print {
    header, .card:not(#output-card), .hero, .btn-group { display: none !important; }
    #output-section { display: block !important; }
    .worksheet-output { border: none; padding: 0; font-size: 13px; }
    body { background: white; }
  }

  /* ===== Auth Screen: split-screen premium ===== */
  #auth-screen {
    min-height: 100vh;
    display: flex;
    background: var(--warm);
  }
  .auth-hero {
    flex: 1.15;
    position: relative;
    background: url('/login-hero.jpg') center/cover no-repeat;
    display: flex;
    align-items: flex-end;
    min-height: 100vh;
  }
  .auth-hero::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(160deg,
      rgba(30,122,96,0.55) 0%,
      rgba(30,122,96,0.25) 40%,
      rgba(20,80,63,0.78) 100%);
  }
  .auth-hero-content {
    position: relative;
    padding: 56px 60px;
    color: #ffffff;
    width: 100%;
  }
  .auth-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
  .auth-brand .logo-dot { width: 44px; height: 44px; background: rgba(255,255,255,0.18); backdrop-filter: blur(6px); border: 1.5px solid rgba(255,255,255,0.4); }
  .auth-brand .logo-dot span { font-size: 22px; }
  .auth-hero h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.9rem, 3.2vw, 2.7rem);
    font-weight: 700;
    letter-spacing: 0.3px;
    margin-bottom: 10px;
  }
  .auth-tagline {
    font-size: 1.05rem;
    font-weight: 700;
    color: rgba(255,255,255,0.95);
    margin-bottom: 10px;
  }
  .auth-support {
    font-size: 0.92rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.82);
    max-width: 480px;
    margin-bottom: 24px;
  }
  .auth-features { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; }
  .auth-features li {
    background: rgba(255,255,255,0.14);
    backdrop-filter: blur(8px);
    border: 1.5px solid rgba(255,255,255,0.35);
    border-radius: 30px;
    padding: 8px 18px;
    font-size: 0.82rem;
    font-weight: 700;
    color: #ffffff;
  }

  .auth-panel {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 28px;
  }
  .auth-card {
    width: 100%;
    max-width: 400px;
  }
  .auth-heading {
    font-family: 'Playfair Display', serif;
    font-size: 1.7rem;
    color: var(--teal-dark);
    margin-bottom: 6px;
  }
  .auth-sub { font-size: 14px; color: var(--muted); margin-bottom: 28px; }
  .auth-card .field { margin-bottom: 16px; }
  .auth-card input {
    padding: 13px 16px;
    border-radius: 12px;
    font-size: 15px;
    background-image: none;
  }
  .auth-card input:focus {
    border-color: var(--teal);
    box-shadow: 0 0 0 4px rgba(45,158,126,0.12);
  }
  .pw-wrap { position: relative; }
  .pw-wrap input { padding-right: 48px; width: 100%; }
  .pw-eye {
    position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
    width: 36px; height: 36px; border: none; background: transparent;
    cursor: pointer; font-size: 17px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    opacity: 0.55; transition: opacity 0.2s;
  }
  .pw-eye:hover, .pw-eye.on { opacity: 1; }
  .auth-row { display: flex; justify-content: flex-end; margin: -6px 0 18px; }
  .auth-forgot {
    font-size: 12.5px; font-weight: 700; color: var(--teal);
    cursor: pointer; text-decoration: none;
  }
  .auth-forgot:hover { text-decoration: underline; }
  .auth-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
    color: white; border: none; border-radius: 12px;
    font-family: 'Nunito', sans-serif; font-size: 15px; font-weight: 800;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s;
  }
  .auth-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(45,158,126,0.32); }
  .auth-btn:focus-visible { outline: 3px solid rgba(45,158,126,0.4); outline-offset: 2px; }
  .auth-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
  .auth-toggle { text-align: center; font-size: 13.5px; color: var(--muted); margin-top: 20px; }
  .auth-toggle a { color: var(--teal); font-weight: 800; cursor: pointer; text-decoration: none; }
  .auth-toggle a:hover { text-decoration: underline; }
  .mission-statement {
    width: 100%;
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background: #E1F5EE;
    border-left: 4px solid #0F6E56;
    border-radius: 12px;
  }
  .mission-statement p {
    color: #085041;
    font-family: 'Nunito', sans-serif;
    font-size: 14px;
    line-height: 1.6;
  }
  .auth-msg { font-size: 13px; padding: 11px 14px; border-radius: 10px; margin-top: 14px; display: none; line-height: 1.5; }
  .auth-msg.error { display: block; background: #fff0f0; border: 1.5px solid #fca5a5; color: #b91c1c; }
  .auth-msg.success { display: block; background: var(--mint); border: 1.5px solid var(--teal); color: var(--teal-dark); }

  @media (max-width: 900px) {
    #auth-screen { flex-direction: column; }
    .auth-hero { min-height: 300px; flex: none; align-items: flex-end; }
    .auth-hero-content { padding: 28px 24px; }
    .auth-support { display: none; }
    .auth-features li { padding: 6px 14px; font-size: 0.75rem; }
    .auth-panel { padding: 36px 22px 56px; }
  }
  @media (prefers-reduced-motion: reduce) {
    .auth-btn, .pw-eye { transition: none; }
  }

  /* ===== App header user bar ===== */
  .user-bar {
    display: flex; align-items: center; gap: 12px; margin-left: auto;
  }
  .user-email { font-size: 12px; color: var(--muted); font-weight: 600; }
  .btn-logout {
    padding: 7px 14px; border-radius: 8px; border: 2px solid var(--mint);
    background: white; color: var(--teal-dark); font-family: 'Nunito', sans-serif;
    font-size: 12px; font-weight: 700; cursor: pointer; transition: all 0.2s;
  }
  .btn-logout:hover { background: var(--mint); }

  /* ===== Quota Badge ===== */
  .quota-bar {
    background: var(--white); border: 2px solid var(--mint); border-radius: 14px;
    padding: 14px 18px; margin-bottom: 20px; display: flex; align-items: center;
    justify-content: space-between; gap: 12px; flex-wrap: wrap;
  }
  .quota-info { flex: 1; min-width: 200px; }
  .quota-label { font-size: 12px; font-weight: 800; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }
  .quota-count { font-family: 'Playfair Display', serif; font-size: 1.1rem; color: var(--teal-dark); margin-top: 2px; }
  .quota-track { height: 8px; background: var(--warm); border-radius: 10px; overflow: hidden; margin-top: 8px; }
  .quota-fill { height: 100%; background: linear-gradient(90deg, var(--teal), var(--teal-dark)); border-radius: 10px; transition: width 0.3s; }
  .quota-fill.warn { background: linear-gradient(90deg, #f59e0b, #d97706); }
  .quota-fill.full { background: linear-gradient(90deg, #ef4444, #dc2626); }
  .quota-renew { font-size: 11px; color: var(--muted); margin-top: 6px; }
  .quota-plan-badge {
    background: var(--mint); color: var(--teal-dark); font-size: 11px; font-weight: 800;
    padding: 5px 12px; border-radius: 20px; white-space: nowrap;
  }
  .quota-blocked {
    display: none; background: #fff7ed; border: 2px solid #fdba74; border-radius: 14px;
    padding: 20px; text-align: center; margin-bottom: 20px;
  }
  .quota-blocked.visible { display: block; }
  .quota-blocked-title { font-family: 'Playfair Display', serif; font-size: 1.1rem; color: #c2410c; margin-bottom: 6px; }
  .quota-blocked-text { font-size: 13px; color: #9a3412; margin-bottom: 4px; }

  /* ===== My Worksheets ===== */
  .ws-search-wrap { position: relative; margin-bottom: 12px; }
  .ws-search-icon {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: var(--muted); pointer-events: none;
  }
  input.ws-search {
    width: 100%;
    padding: 11px 14px 11px 40px;
    border: 2px solid var(--mint);
    border-radius: 12px;
    font-family: 'Nunito', sans-serif;
    font-size: 14px;
    color: var(--text);
    background-color: var(--warm);
    background-image: none;
    appearance: none;
  }
  input.ws-search:focus { outline: none; border-color: var(--teal); background-color: white; }

  .ws-filter-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 16px; }
  .ws-select {
    padding: 10px 32px 10px 14px;
    border: 2px solid var(--mint);
    border-radius: 12px;
    font-family: 'Nunito', sans-serif;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--text);
    background-color: var(--warm);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%232d9e7e' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    flex: 1 1 150px;
    min-width: 130px;
  }
  .ws-select:focus {
    outline: none; border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(45,158,126,0.18);
    background-color: white;
  }
  .ws-mode-chips { display: flex; gap: 8px; flex-wrap: wrap; }
  .ws-chip {
    padding: 6px 14px;
    border-radius: 20px;
    border: 2px solid var(--mint);
    background: transparent;
    color: var(--muted);
    font-family: 'Nunito', sans-serif;
    font-size: 12.5px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }
  .ws-chip:hover { border-color: var(--teal); color: var(--teal-dark); }
  .ws-chip.active { background: #0F6E56; border-color: #0F6E56; color: #E1F5EE; }

  .ws-list { display: flex; flex-direction: column; gap: 10px; }

  .ws-grade-group {
    border: 2px solid var(--mint);
    border-radius: 12px;
    background: var(--warm);
    overflow: hidden;
  }
  .ws-grade-summary {
    display: flex; align-items: center; gap: 8px;
    padding: 14px 16px;
    cursor: pointer;
    list-style: none;
    font-family: 'Nunito', sans-serif;
    user-select: none;
  }
  .ws-grade-summary::-webkit-details-marker { display: none; }
  .ws-chevron {
    display: inline-block;
    color: var(--teal);
    font-size: 12px;
    transition: transform 0.2s;
    flex-shrink: 0;
  }
  .ws-grade-group[open] > .ws-grade-summary .ws-chevron { transform: rotate(90deg); }
  .ws-grade-name { font-weight: 800; font-size: 14.5px; color: var(--teal-dark); }
  .ws-grade-count { font-size: 12.5px; color: var(--muted); }
  .ws-dup-badge {
    background: #fff7ed; color: #c2410c; border: 1.5px solid #fdba74;
    font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 20px;
    margin-left: auto;
  }
  .ws-grade-body { padding: 4px 16px 16px; display: flex; flex-direction: column; gap: 16px; }

  .ws-subject-group { display: flex; flex-direction: column; gap: 8px; }
  .ws-subject-label {
    font-size: 11px; font-weight: 700; color: var(--muted);
    text-transform: uppercase; letter-spacing: 0.5px;
  }
  .ws-rows { display: flex; flex-direction: column; gap: 8px; }

  .ws-item {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 12px 14px; border: 2px solid var(--mint); border-radius: 12px;
    background: white; transition: all 0.2s;
  }
  .ws-item:hover { border-color: var(--teal); }
  .ws-info { flex: 1; min-width: 0; display: flex; align-items: center; gap: 8px; }
  .ws-mode-icon { flex-shrink: 0; }
  .ws-title {
    font-weight: 800; font-size: 13.5px; color: var(--teal-dark);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  }
  .ws-title-full {
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .ws-date { font-size: 11px; color: var(--muted); flex-shrink: 0; white-space: nowrap; }
  .ws-actions { display: flex; gap: 8px; flex-shrink: 0; flex-wrap: nowrap; }
  .ws-btn {
    padding: 7px 12px; border-radius: 8px; font-family: 'Nunito', sans-serif;
    font-size: 12px; font-weight: 700; cursor: pointer; border: 2px solid var(--teal);
    transition: all 0.2s; white-space: nowrap;
  }
  .ws-btn.view { background: white; color: var(--teal); }
  .ws-btn.view:hover { background: var(--mint); }
  .ws-btn.del { background: white; color: #dc2626; border-color: #fca5a5; }
  .ws-btn.del:hover { background: #fff0f0; }

  .ws-version-badge {
    flex-shrink: 0;
    background: #fff7ed; color: #c2410c; border: 1.5px solid #fdba74;
    font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 20px;
    cursor: pointer; white-space: nowrap;
    font-family: 'Nunito', sans-serif;
  }
  .ws-version-badge:hover { background: #ffedd5; }

  .ws-stack { display: flex; flex-direction: column; }
  .ws-stack-versions {
    display: none;
    flex-direction: column; gap: 8px;
    margin-top: 8px; padding-left: 20px;
    border-left: 2px solid var(--mint);
  }
  .ws-stack-versions.open { display: flex; }
  .ws-stack-versions .ws-item { align-items: flex-start; }
  .ws-stack-versions .ws-info { align-items: flex-start; }
  .ws-stack-versions .ws-date { margin-top: 2px; }

  .ws-empty { text-align: center; color: var(--muted); font-size: 13px; padding: 24px; }

  @media (max-width: 580px) {
    .ws-item { padding: 10px 12px; gap: 8px; }
    .ws-title { font-size: 12.5px; }
    .ws-date { display: none; }
    .ws-btn { padding: 6px 9px; font-size: 11px; }
    .ws-version-badge { font-size: 10px; padding: 3px 8px; }
  }
  .saved-badge {
    display: none; background: var(--mint); color: var(--teal-dark);
    font-size: 12px; font-weight: 700; padding: 6px 14px; border-radius: 20px;
    margin-top: 10px; text-align: center;
  }
  .saved-badge.visible { display: inline-block; }

  @media print {
    #auth-screen, .user-bar, #saved-card { display: none !important; }
  }


  /* ===== Mode Toggle ===== */
  .mode-toggle {
    display: flex; gap: 0; border: 2px solid var(--teal); border-radius: 14px;
    overflow: hidden; margin-bottom: 20px;
  }
  .mode-btn {
    flex: 1; padding: 14px; background: white; color: var(--teal-dark);
    border: none; font-family: 'Nunito', sans-serif; font-size: 14px;
    font-weight: 800; cursor: pointer; transition: all 0.2s;
  }
  .mode-btn.active {
    background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
    color: white;
  }
  .mode-desc { font-size: 12px; color: var(--muted); text-align: center; margin-bottom: 16px; }

  /* ===== Interactive Quiz ===== */
  .iq-passage {
    background: linear-gradient(135deg, #fffdf8, var(--peach));
    border: 2px solid var(--mint); border-radius: 16px;
    padding: 24px 26px; margin-bottom: 22px;
    max-width: 100%; box-sizing: border-box; overflow-wrap: break-word;
  }
  .iq-passage-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
  .iq-passage-title { font-family: 'Playfair Display', serif; font-size: 1.05rem; color: var(--teal-dark); flex: 1; min-width: 140px; }
  .iq-passage-text {
    font-size: 15px; line-height: 2; color: var(--text);
    white-space: pre-wrap; overflow-wrap: break-word; word-break: break-word;
    max-width: 100%;
  }
  @media (max-width: 768px) {
    .iq-passage { padding: 18px 18px; }
    .iq-passage-text { font-size: 14.5px; line-height: 1.85; }
  }

  .iq-question {
    background: var(--warm); border: 2px solid var(--mint); border-radius: 14px;
    padding: 20px 22px; margin-bottom: 16px;
  }
  .iq-question.correct { border-color: #22c55e; background: #f0fdf4; }
  .iq-question.wrong { border-color: #f87171; background: #fff5f5; }
  .iq-qtext { font-weight: 800; font-size: 15px; color: var(--text); margin-bottom: 14px; }
  .iq-qhead { display: flex; align-items: flex-start; gap: 10px; }
  .iq-qhead .iq-qtext { flex: 1; margin-bottom: 0; }
  .iq-speak {
    flex-shrink: 0; width: 38px; height: 38px; border-radius: 10px;
    border: 2px solid var(--mint); background: white; cursor: pointer;
    font-size: 16px; transition: all 0.2s; display: flex; align-items: center; justify-content: center;
  }
  .iq-speak:hover { border-color: var(--teal); background: var(--mint); }
  .iq-speak.speaking { background: var(--teal); border-color: var(--teal); }
  .iq-qhead + .iq-choices, .iq-qhead + .iq-tf, .iq-qhead + .iq-blank { margin-top: 14px; }
  .iq-qnum { color: var(--teal); margin-right: 6px; }
  .iq-choices { display: flex; flex-direction: column; gap: 8px; }
  .iq-choice {
    padding: 12px 16px; border: 2px solid var(--mint); border-radius: 10px;
    background: white; cursor: pointer; font-size: 14px; font-weight: 600;
    color: var(--text); transition: all 0.15s; text-align: left;
    font-family: 'Nunito', sans-serif; width: 100%;
  }
  .iq-choice:hover { border-color: var(--teal); background: var(--mint); }
  .iq-choice.selected { border-color: var(--teal); background: var(--mint); font-weight: 800; }
  .iq-choice.reveal-correct { border-color: #22c55e; background: #dcfce7; font-weight: 800; }
  .iq-choice.reveal-wrong { border-color: #f87171; background: #fee2e2; }
  .iq-choice:disabled { cursor: default; }
  .iq-tf { display: flex; gap: 10px; }
  .iq-tf .iq-choice { flex: 1; text-align: center; }
  .iq-blank {
    width: 100%; padding: 12px 16px; border: 2px solid var(--mint); border-radius: 10px;
    font-family: 'Nunito', sans-serif; font-size: 15px; background: white;
    color: var(--text); outline: none;
  }
  .iq-blank:focus { border-color: var(--teal); }
  .iq-feedback { font-size: 12px; font-weight: 700; margin-top: 8px; display: none; }
  .iq-feedback.show-correct { display: block; color: #16a34a; }
  .iq-feedback.show-wrong { display: block; color: #dc2626; }

  .iq-check-btn {
    width: 100%; padding: 15px;
    background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
    color: white; border: none; border-radius: 14px;
    font-family: 'Nunito', sans-serif; font-size: 15px; font-weight: 800;
    cursor: pointer; margin-top: 8px; transition: all 0.2s;
  }
  .iq-check-btn:hover { transform: translateY(-2px); }
  .iq-score {
    display: none; text-align: center; padding: 24px;
    background: linear-gradient(135deg, var(--mint), var(--peach));
    border-radius: 16px; margin-top: 16px;
  }
  .iq-score.visible { display: block; animation: fadeUp 0.4s ease; }
  .iq-score-num { font-family: 'Playfair Display', serif; font-size: 2.2rem; color: var(--teal-dark); font-weight: 700; }
  .iq-score-label { font-size: 15px; font-weight: 800; color: var(--text); margin-top: 4px; }
  .iq-retry {
    margin-top: 14px; padding: 10px 24px; background: white; color: var(--teal-dark);
    border: 2px solid var(--teal); border-radius: 10px; font-family: 'Nunito', sans-serif;
    font-size: 13px; font-weight: 800; cursor: pointer;
  }
  .iq-retry:hover { background: var(--mint); }

  /* confetti */
  .confetti-piece {
    position: fixed; width: 10px; height: 10px; top: -20px; z-index: 9999;
    animation: confettiFall linear forwards; pointer-events: none;
  }
  @keyframes confettiFall {
    to { transform: translateY(110vh) rotate(720deg); opacity: 0.8; }
  }

  /* ---------- FAQ floating button + slide-in panel ---------- */
  .faq-fab {
    position: fixed;
    right: 24px;
    bottom: 28px;
    z-index: 1001;
    background: var(--teal);
    color: var(--white);
    border: none;
    border-radius: 50px;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(45,158,126,0.35);
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 14px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, padding 0.2s ease;
  }
  .faq-fab:hover {
    background: var(--teal-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(45,158,126,0.45);
  }
  .faq-fab-icon {
    width: 22px; height: 22px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(255,255,255,0.25);
    border-radius: 50%;
    font-family: 'Playfair Display', serif;
    font-size: 14px;
  }
  .faq-fab-label { white-space: nowrap; }

  .faq-overlay {
    position: fixed; inset: 0;
    background: rgba(44,62,53,0.25);
    z-index: 1002;
    opacity: 0; pointer-events: none;
    transition: opacity 0.25s ease;
  }
  .faq-overlay.visible { opacity: 1; pointer-events: auto; }

  .faq-panel {
    position: fixed;
    top: 0; right: 0;
    height: 100vh;
    width: 380px;
    max-width: 90vw;
    background: var(--warm);
    box-shadow: -8px 0 32px rgba(45,158,126,0.18);
    z-index: 1003;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
  }
  .faq-panel.open { transform: translateX(0); }

  .faq-panel-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 22px;
    background: var(--white);
    border-bottom: 2px solid var(--mint);
  }
  .faq-panel-header h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    color: var(--teal-dark);
  }
  .faq-close {
    background: none; border: none; font-size: 1.6rem; line-height: 1;
    color: var(--muted); cursor: pointer; padding: 4px 8px; border-radius: 8px;
  }
  .faq-close:hover { background: var(--mint); color: var(--teal-dark); }

  .faq-panel-body {
    padding: 20px 22px 40px;
    overflow-y: auto;
    flex: 1;
  }
  .faq-item {
    background: var(--white);
    border-radius: 12px;
    padding: 16px 18px;
    margin-bottom: 14px;
    box-shadow: var(--shadow);
  }
  .faq-q {
    font-weight: 800;
    color: var(--teal-dark);
    margin-bottom: 6px;
    font-size: 0.95rem;
  }
  .faq-a {
    color: var(--text);
    font-size: 0.88rem;
    line-height: 1.5;
  }
  .faq-a a { color: var(--teal-dark); font-weight: 700; }

  @media (max-width: 500px) {
    .faq-fab-label { display: none; }
    .faq-fab { padding: 14px; border-radius: 50%; }
  }

  /* ---------- Site footer (legal links) ---------- */
  .site-footer {
    background: var(--warm);
    border-top: 2px solid var(--mint);
    padding: 20px 16px 28px;
    text-align: center;
  }
  .footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-family: 'Nunito', sans-serif;
    font-size: 14px;
  }
  .footer-links a {
    color: var(--teal);
    text-decoration: none;
    font-weight: 700;
  }
  .footer-links a:hover {
    color: var(--teal-dark);
    text-decoration: underline;
  }
  .footer-divider {
    color: var(--muted);
  }
  .footer-copyright {
    font-family: 'Nunito', sans-serif;
    font-size: 12.5px;
    color: var(--muted);
    margin-top: 8px;
  }