/*
 * QueStudy Plugin CSS Overrides v6
 * Styling all plugin shortcode output to match the QueStudy theme design.
 * CSS custom properties come from main.css :root.
 */
.questudy- *,
.qs-plugin-content *,
.qs-plugin-container * {
  box-sizing: border-box;
}
.qs-plugin-content {
  padding: 40px 0;
}
.qs-plugin-content-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}
.qs-plugin-container {
  background: var(--qs-bg-card);
  border-radius: var(--qs-radius-lg);
  padding: 32px;
  box-shadow: var(--qs-shadow);
  margin-bottom: 24px;
  border: 1px solid var(--qs-border);
  transition: box-shadow var(--qs-transition);
}
.qs-plugin-container:hover {
  box-shadow: var(--qs-shadow-md);
}

/* ===== Buttons ===== */
.questudy-btn,
.questudy-exam-generator button,
.questudy-register-form button,
.qs-search-btn,
.qs-filter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  line-height: 1.4;
  color: var(--qs-white);
  background: var(--qs-primary);
  border: none;
  border-radius: var(--qs-radius-md);
  cursor: pointer;
  transition: all var(--qs-transition);
  text-decoration: none;
  gap: 8px;
}
.questudy-btn:hover,
.questudy-exam-generator button:hover,
.questudy-register-form button:hover,
.qs-search-btn:hover,
.qs-filter-btn:hover {
  background: var(--qs-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.questudy-btn:active,
.questudy-exam-generator button:active,
.questudy-register-form button:active {
  transform: translateY(0);
}
.questudy-btn:disabled,
.questudy-exam-generator button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.questudy-btn-secondary {
  background: var(--qs-gray-100);
  color: var(--qs-gray-700);
}
.questudy-btn-secondary:hover {
  background: var(--qs-gray-200);
  color: var(--qs-gray-800);
}

/* ===== Form Inputs ===== */
.questudy-exam-generator select,
.questudy-exam-generator input,
.questudy-register-form input,
.qs-search-input,
.qs-filter-select,
.questudy-auth-wrap input,
.questudy- input[type="text"],
.questudy- input[type="email"],
.questudy- input[type="password"],
.questudy- input[type="number"],
.questudy- select,
.questudy- textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--qs-gray-800);
  background: var(--qs-white);
  border: 1.5px solid var(--qs-gray-300);
  border-radius: var(--qs-radius);
  transition: all var(--qs-transition);
  outline: none;
}
.questudy-exam-generator select:focus,
.questudy-exam-generator input:focus,
.questudy-register-form input:focus,
.qs-search-input:focus,
.qs-filter-select:focus,
.questudy- input:focus,
.questudy- select:focus,
.questudy- textarea:focus {
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.questudy-exam-generator select,
.qs-filter-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

/* ===== Exam Generator ===== */
.questudy-exam-generator { padding: 0; }
.questudy-exam-generator .exam-body-select,
.questudy-exam-generator .subject-select { margin-bottom: 16px; }
.questudy-exam-generator .generate-btn {
  padding: 12px 32px;
  font-size: 1rem;
  font-weight: 700;
  background: var(--qs-primary);
  color: var(--qs-white);
  border: none;
  border-radius: var(--qs-radius-md);
  cursor: pointer;
  transition: all var(--qs-transition);
  width: 100%;
}
.questudy-exam-generator .generate-btn:hover {
  background: var(--qs-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

/* ===== Past Questions ===== */
.questudy-past-questions { padding: 0; }
.questudy-past-questions .filter-section {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--qs-gray-200);
}
.questudy-past-questions .question-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: all var(--qs-transition);
  cursor: pointer;
}
.questudy-past-questions .question-card:hover {
  border-color: var(--qs-primary-200);
  box-shadow: var(--qs-shadow-md);
  transform: translateY(-2px);
}
.questudy-past-questions .question-card .question-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--qs-gray-800);
  margin-bottom: 8px;
}
.questudy-past-questions .question-card .question-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--qs-gray-500);
}

/* ===== Dashboard ===== */
.questudy-dashboard { padding: 0; }
.questudy-dashboard .dashboard-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.questudy-dashboard .stat-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--qs-transition);
}
.questudy-dashboard .stat-card:hover {
  box-shadow: var(--qs-shadow-md);
  transform: translateY(-2px);
}
.questudy-dashboard .stat-card .stat-icon {
  font-size: 1.75rem;
  margin-bottom: 8px;
}
.questudy-dashboard .stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--qs-primary);
  line-height: 1.2;
}
.questudy-dashboard .stat-card .stat-label {
  font-size: 0.8125rem;
  color: var(--qs-gray-500);
  margin-top: 4px;
}
.questudy-dashboard .recent-activity { margin-top: 24px; }
.questudy-dashboard .recent-activity h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--qs-gray-800);
}
.questudy-dashboard .activity-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--qs-gray-100);
  transition: background var(--qs-transition);
}
.questudy-dashboard .activity-item:last-child { border-bottom: none; }
.questudy-dashboard .activity-item:hover { background: var(--qs-gray-50); }
.questudy-dashboard .activity-item .activity-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--qs-primary-50);
  border-radius: 50%;
  color: var(--qs-primary-light);
}
.questudy-dashboard .activity-item .activity-text {
  flex: 1;
  font-size: 0.875rem;
  color: var(--qs-gray-700);
}
.questudy-dashboard .activity-item .activity-time {
  font-size: 0.75rem;
  color: var(--qs-gray-400);
  white-space: nowrap;
}

/* ===== Results ===== */
.questudy-results { padding: 0; }
.questudy-results .result-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  padding: 24px;
  margin-bottom: 16px;
  transition: box-shadow var(--qs-transition);
}
.questudy-results .result-card:hover { box-shadow: var(--qs-shadow-md); }
.questudy-results .score-display {
  text-align: center;
  padding: 32px;
}
.questudy-results .score-display .score-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--qs-primary);
  line-height: 1;
}
.questudy-results .score-display .score-label {
  font-size: 0.9375rem;
  color: var(--qs-gray-500);
  margin-top: 4px;
}
.questudy-results .grade-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.questudy-results .grade-badge.grade-a { background: var(--qs-success-bg); color: var(--qs-success); }
.questudy-results .grade-badge.grade-b { background: #fefce8; color: #ca8a04; }
.questudy-results .grade-badge.grade-c { background: #fff7ed; color: #ea580c; }
.questudy-results .grade-badge.grade-d,
.questudy-results .grade-badge.grade-f { background: var(--qs-error-bg); color: var(--qs-error); }

/* ===== Registration Form ===== */
.questudy-register-form {
  max-width: 480px;
  margin: 0 auto;
}
.questudy-register-form input { margin-bottom: 16px; }
.questudy-register-form button {
  width: 100%;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 700;
  margin-top: 8px;
}
.questudy-register-form label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--qs-gray-700);
  margin-bottom: 4px;
}

/* ===== Bookmarks ===== */
.questudy-bookmarks { padding: 0; }
.questudy-bookmarks .bookmark-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-md);
  margin-bottom: 12px;
  transition: all var(--qs-transition);
}
.questudy-bookmarks .bookmark-item:hover {
  border-color: var(--qs-primary-200);
  box-shadow: var(--qs-shadow-sm);
  background: var(--qs-primary-50);
}
.questudy-bookmarks .bookmark-item .bookmark-info { flex: 1; }
.questudy-bookmarks .bookmark-item .bookmark-title {
  font-weight: 600;
  color: var(--qs-gray-800);
}
.questudy-bookmarks .bookmark-item .bookmark-meta {
  font-size: 0.8125rem;
  color: var(--qs-gray-500);
}
.questudy-bookmarks .bookmark-item .bookmark-remove {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--qs-gray-400);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all var(--qs-transition);
}
.questudy-bookmarks .bookmark-item .bookmark-remove:hover {
  color: var(--qs-error);
  background: var(--qs-error-bg);
}

/* ===== Leaderboard ===== */
.questudy-leaderboard { padding: 0; }
.questudy-leaderboard table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
}
.questudy-leaderboard table thead th {
  padding: 12px 16px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--qs-gray-500);
  background: var(--qs-gray-50);
  border-bottom: 2px solid var(--qs-gray-200);
  text-align: left;
}
.questudy-leaderboard table tbody td {
  padding: 14px 16px;
  font-size: 0.9375rem;
  color: var(--qs-gray-700);
  border-bottom: 1px solid var(--qs-gray-100);
}
.questudy-leaderboard table tbody tr { transition: background var(--qs-transition); }
.questudy-leaderboard table tbody tr:hover { background: var(--qs-gray-50); }
.questudy-leaderboard .rank-1 { background: linear-gradient(90deg, rgba(251, 191, 36, 0.12), transparent) !important; }
.questudy-leaderboard .rank-1 td:first-child { font-size: 1.25rem; font-weight: 800; color: #b45309; }
.questudy-leaderboard .rank-2 { background: linear-gradient(90deg, rgba(148, 163, 184, 0.10), transparent) !important; }
.questudy-leaderboard .rank-2 td:first-child { font-size: 1.125rem; font-weight: 700; color: var(--qs-gray-500); }
.questudy-leaderboard .rank-3 { background: linear-gradient(90deg, rgba(180, 83, 9, 0.08), transparent) !important; }
.questudy-leaderboard .rank-3 td:first-child { font-size: 1.0625rem; font-weight: 700; color: #92400e; }
.questudy-leaderboard .current-user-row { background: var(--qs-primary-50) !important; font-weight: 600; }
.questudy-leaderboard .current-user-row td { color: var(--qs-primary); }
.questudy-leaderboard .rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.875rem;
}
.questudy-leaderboard .rank-badge.rank-1-badge { background: #fbbf24; color: #fff; }
.questudy-leaderboard .rank-badge.rank-2-badge { background: #94a3b8; color: #fff; }
.questudy-leaderboard .rank-badge.rank-3-badge { background: #d97706; color: #fff; }

/* ===== Competition =====
   The legacy .questudy-competition / .room-card markup is no longer rendered
   by the plugin; the arena (qca-*) is styled by comp-style.css. These old
   overrides were removed to avoid confusion. */

/* ===== Quick Practice ===== */
.questudy-quick-practice { padding: 0; }
.questudy-quick-practice .practice-settings {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
  padding: 24px;
  background: var(--qs-gray-50);
  border-radius: var(--qs-radius-lg);
}
.questudy-quick-practice .start-btn {
  padding: 16px 40px;
  font-size: 1.125rem;
  font-weight: 700;
  background: var(--qs-primary);
  color: var(--qs-white);
  border: none;
  border-radius: var(--qs-radius-md);
  cursor: pointer;
  transition: all var(--qs-transition);
  width: 100%;
}
.questudy-quick-practice .start-btn:hover {
  background: var(--qs-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

/* ===== Textbook Library ===== */
.questudy-textbook-library { padding: 0; }
.questudy-textbook-library .textbook-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.questudy-textbook-library .textbook-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  padding: 24px;
  transition: all var(--qs-transition);
  text-decoration: none;
  color: inherit;
  display: block;
}
.questudy-textbook-library .textbook-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qs-shadow-lg);
  border-color: var(--qs-primary-200);
}
.questudy-textbook-library .textbook-card .textbook-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--qs-radius-md);
  margin-bottom: 12px;
  background: var(--qs-gray-100);
}
.questudy-textbook-library .textbook-card .textbook-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--qs-gray-800);
  margin-bottom: 4px;
}
.questudy-textbook-library .textbook-card .textbook-author {
  font-size: 0.8125rem;
  color: var(--qs-gray-500);
}
.questudy-textbook-library .textbook-card .textbook-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--qs-gray-100);
  font-size: 0.75rem;
  color: var(--qs-gray-400);
}

/* ===== Textbook Detail ===== */
.questudy-textbook-detail { padding: 0; }
.questudy-textbook-detail .chapter-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.questudy-textbook-detail .chapter-list .chapter-item {
  padding: 14px 20px;
  border-bottom: 1px solid var(--qs-gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--qs-transition);
  cursor: pointer;
}
.questudy-textbook-detail .chapter-list .chapter-item:hover { background: var(--qs-gray-50); }
.questudy-textbook-detail .chapter-list .chapter-item .chapter-number {
  font-weight: 700;
  color: var(--qs-primary);
  margin-right: 12px;
}
.questudy-textbook-detail .chapter-list .chapter-item .chapter-name {
  flex: 1;
  color: var(--qs-gray-700);
}
.questudy-textbook-detail .solution-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-md);
  padding: 20px;
  margin-bottom: 12px;
  transition: box-shadow var(--qs-transition);
}
.questudy-textbook-detail .solution-card:hover { box-shadow: var(--qs-shadow-sm); }
.questudy-textbook-detail .solution-card .solution-step {
  padding: 8px 0;
  font-size: 0.9375rem;
  color: var(--qs-gray-700);
  line-height: 1.6;
}

/* ===== Pricing Table ===== */
.questudy-pricing-table {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}
.questudy-pricing-table .pricing-card {
  background: var(--qs-bg-card);
  border: 2px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-xl);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--qs-transition-slow);
  position: relative;
}
.questudy-pricing-table .pricing-card:hover { box-shadow: var(--qs-shadow-lg); transform: translateY(-4px); }
.questudy-pricing-table .pricing-card.featured {
  border-color: var(--qs-primary);
  transform: scale(1.05);
  box-shadow: var(--qs-shadow-md);
  z-index: 1;
  background: var(--qs-primary);
  color: #fff;
}
.questudy-pricing-table .pricing-card.featured:hover { transform: scale(1.05) translateY(-4px); box-shadow: var(--qs-shadow-lg); }
.questudy-pricing-table .pricing-card.featured .plan-name { color: #fff; }
.questudy-pricing-table .pricing-card.featured .price { color: #fff; }
.questudy-pricing-table .pricing-card.featured .price .period { color: rgba(255,255,255,0.7); }
.questudy-pricing-table .pricing-card.featured .features li { color: rgba(255,255,255,0.9); }
.questudy-pricing-table .pricing-card .pricing-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--qs-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
  margin-bottom: 16px;
}
.questudy-pricing-table .pricing-card .plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--qs-gray-800);
  margin-bottom: 8px;
}
.questudy-pricing-table .pricing-card .price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--qs-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.questudy-pricing-table .pricing-card .price .currency {
  font-size: 1.25rem;
  font-weight: 600;
  vertical-align: super;
}
.questudy-pricing-table .pricing-card .price .period {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--qs-gray-500);
}
.questudy-pricing-table .pricing-card .features {
  list-style: none;
  padding: 0;
  margin: 24px 0;
  text-align: left;
}
.questudy-pricing-table .pricing-card .features li {
  padding: 8px 0;
  font-size: 0.875rem;
  color: var(--qs-gray-600);
  display: flex;
  align-items: center;
  gap: 8px;
}
.questudy-pricing-table .pricing-card .features li .check { color: var(--qs-success); font-weight: 700; }
.questudy-pricing-table .pricing-card .features li .cross { color: var(--qs-gray-300); font-weight: 700; }
.questudy-pricing-table .pricing-card .cta-btn {
  width: 100%;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 700;
  background: var(--qs-primary);
  color: #fff;
  border: none;
  border-radius: var(--qs-radius-md);
  cursor: pointer;
  transition: all var(--qs-transition);
}
.questudy-pricing-table .pricing-card .cta-btn:hover {
  background: var(--qs-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.questudy-pricing-table .pricing-card.featured .cta-btn { background: #fff; color: var(--qs-primary); }
.questudy-pricing-table .pricing-card.featured .cta-btn:hover { background: rgba(255,255,255,0.9); }

/* ===== Exam Interface ===== */
.questudy-exam-interface { padding: 0; }
.questudy-exam-interface .question-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--qs-gray-50);
  border-radius: var(--qs-radius-lg);
}
.questudy-exam-interface .question-nav .nav-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius);
  background: var(--qs-white);
  color: var(--qs-gray-600);
  cursor: pointer;
  transition: all var(--qs-transition);
}
.questudy-exam-interface .question-nav .nav-btn:hover { border-color: var(--qs-primary-200); color: var(--qs-primary); }
.questudy-exam-interface .question-nav .nav-btn.active { background: var(--qs-primary); border-color: var(--qs-primary); color: #fff; }
.questudy-exam-interface .question-nav .nav-btn.answered { background: var(--qs-success-bg); border-color: var(--qs-success-light); color: var(--qs-success); }
.questudy-exam-interface .question-area {
  padding: 24px;
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  margin-bottom: 20px;
}
.questudy-exam-interface .question-area .question-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--qs-gray-800);
  margin-bottom: 20px;
  line-height: 1.6;
}
.questudy-exam-interface .option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  margin-bottom: 10px;
  border: 2px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-md);
  cursor: pointer;
  transition: all var(--qs-transition);
  font-size: 0.9375rem;
  color: var(--qs-gray-700);
}
.questudy-exam-interface .option:hover { border-color: var(--qs-primary); background: var(--qs-primary-50); }
.questudy-exam-interface .option.selected { border-color: var(--qs-primary); background: var(--qs-primary-50); color: var(--qs-primary); font-weight: 600; }
.questudy-exam-interface .option .option-indicator {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--qs-gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--qs-transition);
}
.questudy-exam-interface .option.selected .option-indicator { border-color: var(--qs-primary); background: var(--qs-primary); color: #fff; }
.questudy-exam-interface .option .option-label {
  font-weight: 600;
  color: var(--qs-gray-500);
  min-width: 24px;
}
.questudy-exam-interface .timer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--qs-primary);
  padding: 16px;
  margin-bottom: 20px;
  background: var(--qs-primary-50);
  border-radius: var(--qs-radius-lg);
}
.questudy-exam-interface .timer.warning {
  color: var(--qs-error);
  background: var(--qs-error-bg);
  animation: qs-pulse 1s ease-in-out infinite;
}
@keyframes qs-pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.7; } }
.questudy-exam-interface .submit-btn {
  width: 100%;
  padding: 16px 32px;
  font-size: 1.125rem;
  font-weight: 700;
  background: var(--qs-success);
  color: #fff;
  border: none;
  border-radius: var(--qs-radius-md);
  cursor: pointer;
  transition: all var(--qs-transition);
  margin-top: 20px;
}
.questudy-exam-interface .submit-btn:hover { background: #15803d; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(22,163,74,0.3); }
.questudy-exam-interface .progress-bar {
  width: 100%;
  height: 8px;
  background: var(--qs-gray-200);
  border-radius: 4px;
  margin-bottom: 20px;
  overflow: hidden;
}
.questudy-exam-interface .progress-bar .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--qs-primary-light), var(--qs-primary));
  border-radius: 4px;
  transition: width 0.4s ease;
}

/* ===== Competition Room ===== */
.questudy-comp-room { padding: 0; }
.questudy-comp-room .player-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.questudy-comp-room .player-cards .player-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  padding: 20px;
  text-align: center;
  transition: all var(--qs-transition);
}
.questudy-comp-room .player-cards .player-card:hover { box-shadow: var(--qs-shadow-md); }
.questudy-comp-room .player-cards .player-card .player-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--qs-primary-100);
  color: var(--qs-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 8px;
}
.questudy-comp-room .player-cards .player-card .player-name { font-weight: 600; color: var(--qs-gray-800); }
.questudy-comp-room .player-cards .player-card .player-score { font-size: 1.25rem; font-weight: 700; color: var(--qs-primary); }
.questudy-comp-room .player-cards .player-card.is-current { border-color: var(--qs-primary); background: var(--qs-primary-50); }
.questudy-comp-room .live-feed {
  background: var(--qs-gray-50);
  border-radius: var(--qs-radius-lg);
  padding: 20px;
  max-height: 300px;
  overflow-y: auto;
}
.questudy-comp-room .live-feed .feed-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--qs-gray-100);
  font-size: 0.875rem;
  color: var(--qs-gray-600);
  display: flex;
  justify-content: space-between;
}
.questudy-comp-room .live-feed .feed-item:last-child { border-bottom: none; }
.questudy-comp-room .live-feed .feed-item .feed-time { font-size: 0.75rem; color: var(--qs-gray-400); }

/* ===== Notes Generator ===== */
.questudy-notes-generator { padding: 0; }
.questudy-notes-generator .notes-controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 20px;
  background: var(--qs-gray-50);
  border-radius: var(--qs-radius-lg);
}
.questudy-notes-generator .notes-output {
  padding: 24px;
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  min-height: 200px;
  line-height: 1.7;
  color: var(--qs-gray-700);
}
.questudy-notes-generator .notes-output h1,
.questudy-notes-generator .notes-output h2,
.questudy-notes-generator .notes-output h3 { color: var(--qs-gray-800); margin-top: 20px; margin-bottom: 10px; }
.questudy-notes-generator .notes-output p { margin-bottom: 12px; }

/* ===== Thesis Assistant ===== */
.questudy-thesis-assistant { padding: 0; }
.questudy-thesis-assistant .research-tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.questudy-thesis-assistant .research-tools .tool-card {
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
  padding: 20px;
  transition: all var(--qs-transition);
  cursor: pointer;
}
.questudy-thesis-assistant .research-tools .tool-card:hover { border-color: var(--qs-primary-200); box-shadow: var(--qs-shadow-md); transform: translateY(-2px); }
.questudy-thesis-assistant .research-tools .tool-card .tool-icon { font-size: 1.5rem; margin-bottom: 8px; }
.questudy-thesis-assistant .research-tools .tool-card .tool-name { font-weight: 600; color: var(--qs-gray-800); }
.questudy-thesis-assistant .citation-manager {
  margin-top: 24px;
  padding: 20px;
  background: var(--qs-gray-50);
  border-radius: var(--qs-radius-lg);
}
.questudy-thesis-assistant .citation-manager .citation-item {
  padding: 10px 14px;
  background: var(--qs-white);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-md);
  margin-bottom: 8px;
  font-size: 0.875rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ===== Notices ===== */
.questudy-notice {
  padding: 16px 20px;
  border-radius: var(--qs-radius-md);
  margin-bottom: 16px;
  font-size: 0.9375rem;
  line-height: 1.5;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.questudy-notice-error { background: var(--qs-error-bg); border: 1px solid var(--qs-error-light); color: var(--qs-error); }
.questudy-notice-success { background: var(--qs-success-bg); border: 1px solid var(--qs-success-light); color: var(--qs-success); }
.questudy-notice-info { background: var(--qs-info-bg); border: 1px solid var(--qs-info-light); color: var(--qs-info); }
.questudy-notice .notice-icon { flex-shrink: 0; font-size: 1.25rem; }

/* ===== Auth Forms ===== */
.questudy-auth-wrap {
  max-width: 480px;
  margin: 0 auto;
  padding: 40px 0;
}
.questudy-auth-header { text-align: center; margin-bottom: 32px; }
.questudy-auth-header .questudy-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  background: var(--qs-primary-50);
  color: var(--qs-primary);
  border-radius: 20px;
  margin-bottom: 8px;
}
.questudy-auth-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--qs-gray-800);
  margin: 0;
}
.questudy-auth-link {
  text-align: center;
  margin-top: 16px;
  font-size: 0.875rem;
  color: var(--qs-gray-500);
}
.questudy-auth-link a { color: var(--qs-primary); font-weight: 600; text-decoration: none; }
.questudy-auth-link a:hover { text-decoration: underline; }

/* ===== Empty States ===== */
.questudy-empty-state {
  text-align: center;
  padding: 60px 20px;
}
.questudy-empty-state .empty-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.4; }
.questudy-empty-state h3 { font-size: 1.25rem; font-weight: 600; color: var(--qs-gray-700); margin-bottom: 8px; }
.questudy-empty-state p { font-size: 0.9375rem; color: var(--qs-gray-500); margin-bottom: 20px; }

/* ===== Upgrade Prompts ===== */
.questudy-upgrade-prompt {
  padding: 32px;
  background: linear-gradient(135deg, var(--qs-primary), var(--qs-primary-light));
  color: #fff;
  border-radius: var(--qs-radius-xl);
  text-align: center;
}
.questudy-upgrade-prompt h3 { font-size: 1.375rem; font-weight: 700; margin-bottom: 8px; }
.questudy-upgrade-prompt p { font-size: 0.9375rem; opacity: 0.9; margin-bottom: 20px; }
.questudy-upgrade-prompt .upgrade-btn {
  display: inline-block;
  padding: 12px 32px;
  background: #fff;
  color: var(--qs-primary);
  border: none;
  border-radius: var(--qs-radius-md);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--qs-transition);
  text-decoration: none;
}
.questudy-upgrade-prompt .upgrade-btn:hover { background: var(--qs-gray-100); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }

/* ===== Subscription ===== */
.questudy-subscription-info {
  padding: 24px;
  background: var(--qs-bg-card);
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius-lg);
}
.questudy-subscription-info .sub-detail {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--qs-gray-100);
  font-size: 0.9375rem;
}
.questudy-subscription-info .sub-detail:last-child { border-bottom: none; }
.questudy-subscription-info .sub-detail .sub-label { color: var(--qs-gray-500); }
.questudy-subscription-info .sub-detail .sub-value { font-weight: 600; color: var(--qs-gray-800); }
.questudy-subscription-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
}
.questudy-subscription-badge.active { background: var(--qs-success-bg); color: var(--qs-success); }
.questudy-subscription-badge.expired { background: var(--qs-error-bg); color: var(--qs-error); }
.questudy-subscription-badge.pending { background: #fefce8; color: #ca8a04; }

/* ===== Spinner ===== */
.questudy-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
.questudy-spinner .spinner-icon {
  width: 36px;
  height: 36px;
  border: 3px solid var(--qs-gray-200);
  border-top-color: var(--qs-primary);
  border-radius: 50%;
  animation: qs-spin 0.6s linear infinite;
}
@keyframes qs-spin { to { transform: rotate(360deg); } }

/* ===== Pagination ===== */
.questudy-pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--qs-gray-200);
}
.questudy-pagination .page-btn {
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--qs-gray-200);
  border-radius: var(--qs-radius);
  background: var(--qs-white);
  color: var(--qs-gray-600);
  cursor: pointer;
  transition: all var(--qs-transition);
}
.questudy-pagination .page-btn:hover { border-color: var(--qs-primary); color: var(--qs-primary); }
.questudy-pagination .page-btn.active { background: var(--qs-primary); border-color: var(--qs-primary); color: #fff; }

/* ===== Modal ===== */
.questudy-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: qs-fadeIn 0.2s ease;
}
.questudy-modal {
  background: var(--qs-bg-card);
  border-radius: var(--qs-radius-xl);
  padding: 32px;
  max-width: 520px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px rgba(0,0,0,0.15);
  animation: qs-scaleIn 0.2s ease;
}
@keyframes qs-fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes qs-scaleIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }
.questudy-modal .modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.questudy-modal .modal-header h3 { font-size: 1.25rem; font-weight: 700; color: var(--qs-gray-800); margin: 0; }
.questudy-modal .modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--qs-gray-400);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  transition: color var(--qs-transition);
}
.questudy-modal .modal-close:hover { color: var(--qs-gray-600); }

/* ===== Tooltips ===== */
.questudy-tooltip { position: relative; }
.questudy-tooltip .tooltip-text {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  color: #fff;
  background: var(--qs-gray-800);
  border-radius: var(--qs-radius-sm);
  white-space: nowrap;
  transition: all var(--qs-transition);
  z-index: 10;
}
.questudy-tooltip:hover .tooltip-text { visibility: visible; opacity: 1; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .questudy-pricing-table { grid-template-columns: 1fr 1fr; }
  .questudy-pricing-table .pricing-card.featured { grid-column: span 2; transform: none; }
  .questudy-pricing-table .pricing-card.featured:hover { transform: translateY(-4px); }
  .questudy-textbook-library .textbook-grid { grid-template-columns: repeat(2, 1fr); }
  .questudy-dashboard .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
  .questudy-exam-interface .question-nav .nav-btn { width: 36px; height: 36px; font-size: 0.8125rem; }
}
@media (max-width: 768px) {
  .qs-plugin-container { padding: 24px 16px; }
  .questudy-pricing-table { grid-template-columns: 1fr; }
  .questudy-pricing-table .pricing-card.featured { grid-column: span 1; transform: none; }
  .questudy-pricing-table .pricing-card.featured:hover { transform: translateY(-4px); }
  .questudy-textbook-library .textbook-grid { grid-template-columns: 1fr 1fr; }
  .questudy-dashboard .dashboard-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .questudy-dashboard .stat-card { padding: 16px; }
  .questudy-exam-interface .option { padding: 12px 14px; }
  .questudy-quick-practice .practice-settings { grid-template-columns: 1fr; }
  .questudy-comp-room .player-cards { grid-template-columns: repeat(2, 1fr); }
  .qs-register-layout { grid-template-columns: 1fr !important; }
  .qs-register-layout .qs-benefits { order: 2; }
  .qs-register-layout .qs-register-form-wrap { order: 1; }
}
@media (max-width: 480px) {
  .qs-plugin-container { padding: 16px 12px; border-radius: var(--qs-radius-md); }
  .questudy-textbook-library .textbook-grid { grid-template-columns: 1fr; }
  .questudy-dashboard .dashboard-stats { grid-template-columns: 1fr 1fr; gap: 8px; }
  .questudy-dashboard .stat-card { padding: 12px; }
  .questudy-dashboard .stat-card .stat-value { font-size: 1.375rem; }
  .questudy-dashboard .stat-card .stat-icon { font-size: 1.375rem; }
  .questudy-exam-interface .question-area { padding: 16px; }
  .questudy-exam-interface .question-area .question-text { font-size: 1rem; }
  .questudy-exam-interface .option { padding: 10px 12px; font-size: 0.875rem; }
  .questudy-exam-interface .timer { font-size: 1.25rem; padding: 12px; }
  .questudy-exam-interface .question-nav .nav-btn { width: 32px; height: 32px; font-size: 0.75rem; }
  .questudy-comp-room .player-cards { grid-template-columns: 1fr; }
  .questudy-leaderboard table thead th,
  .questudy-leaderboard table tbody td { padding: 10px 8px; font-size: 0.8125rem; }
  .questudy-pricing-table .pricing-card { padding: 24px 16px; }
  .questudy-pricing-table .pricing-card .price { font-size: 2rem; }
  .qs-plugin-content { padding: 20px 0; }
  .questudy-bookmarks .bookmark-item { flex-direction: column; align-items: flex-start; gap: 8px; }
  .questudy-auth-wrap { padding: 20px 0; }
}