/* ============================================
   OYSTEROLOGY ONLINE EDUCATION — Styles
   ============================================ */

/* --- View Management --- */
.edu-view {
  display: none;
  opacity: 0;
  transition: opacity .3s ease;
}
.edu-view.active {
  display: block;
  opacity: 1;
}
.edu-view.exit {
  opacity: 0;
}
.edu-view-inner {
  padding-top: var(--nav-height);
  min-height: 100vh;
}
.edu-reveal {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity .7s ease, transform .7s ease;
}
.edu-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Education Hero --- */
.edu-hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--white);
  overflow: hidden;
}
.edu-hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11,29,53,.3) 0%, rgba(11,29,53,.65) 50%, rgba(11,29,53,.95) 100%),
    url('images/bar-setup.jpg');
  background-size: cover;
  background-position: center;
}
.edu-hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 40%, rgba(201,169,110,.2) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 60%, rgba(41,128,185,.15) 0%, transparent 60%);
}
.edu-hero-content {
  position: relative;
  z-index: 2;
  padding: 140px 24px 100px;
  max-width: 800px;
}
.edu-hero-badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--gold);
  border: 1px solid rgba(201,169,110,.4);
  padding: 8px 24px;
  border-radius: 50px;
  margin-bottom: 28px;
  animation: fadeInDown .8s ease;
}
.edu-hero h1 {
  font-size: clamp(3rem, 6vw, 5rem);
  margin-bottom: 20px;
  animation: fadeInUp .8s ease .2s both;
}
.edu-hero h1 span {
  display: block;
  font-family: var(--font-accent);
  font-weight: 400;
  font-style: italic;
  font-size: .45em;
  color: var(--gold-light);
  margin-top: 4px;
}
.edu-hero-text {
  font-size: 1.1rem;
  color: rgba(255,255,255,.75);
  max-width: 580px;
  margin: 0 auto 40px;
  line-height: 1.8;
  animation: fadeInUp .8s ease .4s both;
}
.edu-hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  animation: fadeInUp .8s ease .6s both;
}
.edu-hero-stat {
  text-align: center;
}
.edu-hero-stat-num {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}
.edu-hero-stat-label {
  font-size: .8rem;
  color: rgba(255,255,255,.6);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-top: 4px;
}

/* --- Age Group Cards --- */
.edu-age-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.edu-age-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 44px 32px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all .4s cubic-bezier(.4,0,.2,1);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border: 2px solid transparent;
}
.edu-age-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform .4s ease;
}
.edu-age-card:hover::before { transform: scaleX(1); }
.edu-age-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent);
}
.edu-age-icon {
  width: 88px; height: 88px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 2.5rem;
  transition: transform .3s ease;
}
.edu-age-card:hover .edu-age-icon { transform: scale(1.1); }
.edu-age-card h3 {
  margin-bottom: 4px;
  font-size: 1.5rem;
}
.edu-age-range {
  font-size: .85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
}
.edu-age-card p {
  color: var(--text-light);
  font-size: .9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}
.edu-age-meta {
  display: flex;
  gap: 16px;
  justify-content: center;
  font-size: .8rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.edu-age-btn {
  width: 100%;
  justify-content: center;
  color: var(--white) !important;
}

/* --- How It Works Steps --- */
.edu-steps {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  justify-content: center;
}
.edu-step {
  text-align: center;
  flex: 1;
  max-width: 220px;
}
.edu-step-num {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--navy);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.edu-step h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.edu-step p {
  color: var(--text-light);
  font-size: .85rem;
  line-height: 1.6;
}
.edu-step-arrow {
  font-size: 1.5rem;
  color: var(--gold);
  margin-top: 16px;
  flex-shrink: 0;
}

/* --- Breadcrumb --- */
.edu-breadcrumb {
  padding: 24px 0 16px;
  font-size: .85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.edu-breadcrumb a {
  color: var(--gold-dark);
  cursor: pointer;
  transition: color .2s;
}
.edu-breadcrumb a:hover {
  color: var(--gold);
}

/* --- Lessons List --- */
.edu-lessons-header {
  padding-top: 16px;
}
.edu-lessons-hero {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 28px 32px;
  background: var(--accent-light);
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
  border-left: 5px solid var(--accent);
}
.edu-lessons-hero-icon {
  font-size: 3rem;
  flex-shrink: 0;
}
.edu-lessons-hero h2 {
  margin-bottom: 4px;
}
.edu-lessons-hero-sub {
  color: var(--text-light);
  font-size: .95rem;
}
.edu-lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  padding-bottom: 80px;
}
.edu-lesson-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all .3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border: 2px solid transparent;
}
.edu-lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.edu-lesson-card.completed {
  background: linear-gradient(135deg, rgba(39,174,96,.03), rgba(39,174,96,.08));
}
.edu-lesson-num {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent);
  opacity: .15;
  line-height: 1;
  position: absolute;
  top: 16px;
  right: 20px;
}
.edu-lesson-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}
.edu-lesson-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}
.edu-lesson-subtitle {
  color: var(--text-light);
  font-size: .9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}
.edu-lesson-meta {
  display: flex;
  gap: 16px;
  font-size: .8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.edu-lesson-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: .8rem;
  font-weight: 600;
  background: rgba(39,174,96,.1);
  color: #27ae60;
}
.edu-lesson-badge.start {
  background: var(--accent-light, rgba(201,169,110,.12));
  color: var(--accent, var(--gold-dark));
}

/* --- Lesson Content --- */
.edu-lesson-hero {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 40px;
  aspect-ratio: 21/9;
  max-height: 400px;
}
.edu-lesson-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.edu-lesson-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11,29,53,.9) 0%, rgba(11,29,53,.3) 40%, transparent 70%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 40px;
  color: var(--white);
}
.edu-lesson-hero-label {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}
.edu-lesson-hero-overlay h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 8px;
}
.edu-lesson-hero-overlay p {
  font-family: var(--font-accent);
  font-style: italic;
  color: rgba(255,255,255,.7);
  font-size: 1.1rem;
}
.edu-lesson-hero-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
  font-size: .85rem;
  color: rgba(255,255,255,.6);
}

.edu-lesson-body {
  padding-bottom: 80px;
}
.edu-lesson-text {
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text);
}
.edu-lesson-text h3 {
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--navy);
}
.edu-lesson-text p {
  margin-bottom: 16px;
}
.edu-lesson-text ul, .edu-lesson-text ol {
  margin-bottom: 16px;
  padding-left: 24px;
}
.edu-lesson-text li {
  margin-bottom: 8px;
  list-style: disc;
  color: var(--text-light);
}
.edu-lesson-text ol li {
  list-style: decimal;
}

/* Callouts */
.edu-callout {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  border-radius: var(--radius);
  margin: 24px 0;
  font-size: .95rem;
  line-height: 1.7;
}
.edu-callout-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.edu-callout-fun {
  background: rgba(201,169,110,.08);
  border-left: 4px solid var(--gold);
}
.edu-callout-wow {
  background: rgba(41,128,185,.08);
  border-left: 4px solid var(--ocean-light);
}

/* Key Terms */
.edu-key-terms {
  max-width: 760px;
  margin: 48px auto 40px;
  padding: 32px;
  background: var(--cream);
  border-radius: var(--radius-lg);
}
.edu-key-terms h3 {
  margin-bottom: 20px;
}
.edu-terms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.edu-term-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px 20px;
  border-left: 3px solid var(--gold);
}
.edu-term-word {
  font-weight: 700;
  font-size: .95rem;
  margin-bottom: 4px;
  color: var(--navy);
}
.edu-term-def {
  font-size: .85rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* Quiz CTA */
.edu-quiz-cta {
  max-width: 760px;
  margin: 48px auto 0;
}
.edu-quiz-cta-inner {
  text-align: center;
  padding: 48px 40px;
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  border-radius: var(--radius-lg);
  color: var(--white);
}
.edu-quiz-cta-inner h3 {
  margin-bottom: 12px;
  color: var(--white);
}
.edu-quiz-cta-inner p {
  color: rgba(255,255,255,.7);
  margin-bottom: 24px;
  font-size: .95rem;
}

/* --- Quiz --- */
.edu-quiz-container {
  max-width: 700px;
  margin: 20px auto 80px;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.edu-quiz-header {
  padding: 0;
}
.edu-quiz-progress-bar {
  height: 6px;
  background: var(--cream);
  width: 100%;
}
.edu-quiz-progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width .5s ease;
}
.edu-quiz-meta {
  display: flex;
  justify-content: space-between;
  padding: 16px 32px;
  font-size: .8rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.edu-quiz-body {
  padding: 40px 32px;
}
.edu-quiz-question {
  font-size: 1.4rem;
  margin-bottom: 32px;
  line-height: 1.4;
}
.edu-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.edu-quiz-option {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border: 2px solid var(--cream-dark);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
  transition: all .2s ease;
  text-align: left;
  font-size: 1rem;
  color: var(--text);
}
.edu-quiz-option:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--accent-light, rgba(201,169,110,.06));
}
.edu-quiz-option-letter {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--cream);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .9rem;
  color: var(--navy);
  flex-shrink: 0;
  transition: all .2s ease;
}
.edu-quiz-option:hover:not(.disabled) .edu-quiz-option-letter {
  background: var(--accent, var(--gold));
  color: var(--white);
}
.edu-quiz-option.correct {
  border-color: #27ae60;
  background: rgba(39,174,96,.08);
}
.edu-quiz-option.correct .edu-quiz-option-letter {
  background: #27ae60;
  color: var(--white);
}
.edu-quiz-option.incorrect {
  border-color: #e74c3c;
  background: rgba(231,76,60,.08);
}
.edu-quiz-option.incorrect .edu-quiz-option-letter {
  background: #e74c3c;
  color: var(--white);
}
.edu-quiz-option.disabled {
  cursor: default;
  opacity: .7;
}
.edu-quiz-option.disabled:not(.correct):not(.incorrect) {
  opacity: .5;
}

.edu-quiz-footer {
  padding: 20px 32px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.edu-quiz-dots {
  display: flex;
  gap: 8px;
}
.edu-quiz-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--cream-dark);
  transition: all .3s ease;
}
.edu-quiz-dot.answered {
  background: var(--gold);
}
.edu-quiz-dot.current {
  background: var(--navy);
  transform: scale(1.3);
}
.edu-quiz-feedback {
  padding: 12px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  width: 100%;
  text-align: center;
}
.edu-quiz-feedback.correct {
  background: rgba(39,174,96,.1);
  color: #27ae60;
}
.edu-quiz-feedback.incorrect {
  background: rgba(231,76,60,.1);
  color: #e74c3c;
}

/* --- Results --- */
.edu-results-container {
  max-width: 700px;
  margin: 40px auto 80px;
  text-align: center;
}
.edu-results-circle {
  width: 180px; height: 180px;
  margin: 0 auto 32px;
  position: relative;
}
.edu-results-circle svg {
  width: 100%; height: 100%;
}
.edu-results-ring {
  animation: drawRing 1.5s ease-out forwards;
}
@keyframes drawRing {
  from { stroke-dashoffset: 339.292; }
}
.edu-results-score {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--navy);
}
.edu-results-container h2 {
  margin-bottom: 12px;
}
.edu-results-detail {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
}
.edu-results-msg {
  color: var(--text-light);
  font-size: 1rem;
  margin-bottom: 32px;
}
.edu-results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.edu-results-review {
  text-align: left;
  background: var(--cream);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.edu-results-review h3 {
  margin-bottom: 20px;
}
.edu-review-item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.edu-review-item:last-child {
  border-bottom: none;
}
.edu-review-icon {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  font-size: .9rem;
}
.edu-review-item.correct .edu-review-icon {
  background: rgba(39,174,96,.1);
  color: #27ae60;
}
.edu-review-item.incorrect .edu-review-icon {
  background: rgba(231,76,60,.1);
  color: #e74c3c;
}
.edu-review-q {
  font-weight: 600;
  margin-bottom: 4px;
  font-size: .95rem;
}
.edu-review-a {
  font-size: .85rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* --- Certificate Form --- */
.edu-cert-form-container {
  max-width: 520px;
  margin: 60px auto 80px;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-lg);
}
.edu-cert-form-header {
  text-align: center;
  margin-bottom: 32px;
}
.edu-cert-form-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}
.edu-cert-form-header h2 {
  margin-bottom: 12px;
}
.edu-cert-form-header p {
  color: var(--text-light);
  font-size: .95rem;
  line-height: 1.6;
}
.edu-cert-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.edu-cert-form-note {
  text-align: center;
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Certificate Display --- */
.edu-cert-wrapper {
  padding: 40px 0 80px;
  text-align: center;
}
.edu-certificate {
  max-width: 820px;
  margin: 0 auto 40px;
  background: #fffdf7;
  border-radius: 4px;
  box-shadow: 0 10px 50px rgba(0,0,0,.15);
  padding: 8px;
}
.edu-cert-border {
  border: 3px solid var(--gold);
  border-radius: 2px;
  padding: 4px;
}
.edu-cert-inner {
  border: 1px solid var(--gold-light);
  padding: 56px 48px;
  position: relative;
}

/* Corners */
.edu-cert-corner {
  position: absolute;
  width: 40px; height: 40px;
  border-color: var(--gold);
  border-style: solid;
}
.edu-cert-corner.tl { top: 12px; left: 12px; border-width: 3px 0 0 3px; }
.edu-cert-corner.tr { top: 12px; right: 12px; border-width: 3px 3px 0 0; }
.edu-cert-corner.bl { bottom: 12px; left: 12px; border-width: 0 0 3px 3px; }
.edu-cert-corner.br { bottom: 12px; right: 12px; border-width: 0 3px 3px 0; }

.edu-cert-logo {
  font-size: 2.5rem;
  margin-bottom: 8px;
}
.edu-cert-org {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--navy);
  letter-spacing: .05em;
  margin-bottom: 4px;
}
.edu-cert-presents {
  font-family: var(--font-accent);
  font-style: italic;
  color: var(--text-muted);
  font-size: .95rem;
  margin-bottom: 12px;
}
.edu-cert-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--gold-dark);
  margin-bottom: 16px;
  letter-spacing: .02em;
}
.edu-cert-awarded {
  font-family: var(--font-accent);
  font-style: italic;
  color: var(--text-light);
  font-size: 1rem;
  margin-bottom: 8px;
}
.edu-cert-name {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-style: italic;
  color: var(--navy);
  margin-bottom: 16px;
}
.edu-cert-divider {
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin: 16px auto;
}
.edu-cert-desc {
  font-size: .95rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}
.edu-cert-desc strong {
  color: var(--navy);
}
.edu-cert-date {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}
.edu-cert-signatures {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}
.edu-cert-sig {
  flex: 1;
  text-align: center;
}
.edu-cert-sig-line {
  width: 80%;
  height: 1px;
  background: var(--navy);
  margin: 0 auto 8px;
}
.edu-cert-sig-name {
  font-family: var(--font-heading);
  font-size: .95rem;
  color: var(--navy);
}
.edu-cert-sig-title {
  font-size: .75rem;
  color: var(--text-muted);
}
.edu-cert-seal {
  flex-shrink: 0;
}
.edu-cert-seal-inner {
  width: 72px; height: 72px;
  border-radius: 50%;
  border: 3px solid var(--gold);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  line-height: 1.2;
  color: var(--gold-dark);
}
.edu-cert-seal-inner small {
  font-size: .55rem;
  font-weight: 700;
  letter-spacing: .15em;
  color: var(--gold-dark);
}

.edu-cert-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Confetti --- */
.edu-confetti-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  overflow: hidden;
}
.edu-confetti-piece {
  position: absolute;
  top: -20px;
  animation: confettiFall linear forwards;
}
@keyframes confettiFall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  80% { opacity: 1; }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* --- Print Styles --- */
@media print {
  .nav, .footer, .edu-cert-actions, .edu-breadcrumb { display: none !important; }
  .edu-view-inner { padding-top: 0; }
  .edu-certificate { box-shadow: none; }
  .edu-cert-wrapper { padding: 0; }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .edu-age-grid { grid-template-columns: 1fr 1fr; }
  .edu-steps { flex-wrap: wrap; }
  .edu-step-arrow { display: none; }
}

@media (max-width: 768px) {
  .edu-hero { min-height: 70vh; }
  .edu-hero-content { padding: 120px 24px 60px; }
  .edu-hero-stats { gap: 24px; }
  .edu-hero-stat-num { font-size: 2rem; }
  .edu-age-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
  .edu-lessons-grid { grid-template-columns: 1fr; }
  .edu-lesson-hero { aspect-ratio: 16/9; }
  .edu-lesson-hero-overlay { padding: 24px; }
  .edu-quiz-body { padding: 24px 20px; }
  .edu-quiz-meta { padding: 12px 20px; }
  .edu-quiz-footer { padding: 16px 20px 24px; }
  .edu-quiz-question { font-size: 1.2rem; }
  .edu-cert-form-container { padding: 32px 24px; }
  .edu-cert-inner { padding: 32px 20px; }
  .edu-cert-signatures { flex-direction: column; align-items: center; gap: 24px; }
  .edu-cert-seal { order: -1; }
  .edu-lessons-hero { flex-direction: column; text-align: center; }
  .edu-results-actions { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .edu-hero h1 { font-size: clamp(2rem, 8vw, 3rem); }
  .edu-hero-stats { flex-direction: column; gap: 16px; }
  .edu-quiz-option { padding: 14px 16px; gap: 12px; }
  .edu-quiz-option-letter { width: 30px; height: 30px; font-size: .8rem; }
}