:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --surface-strong: #f0ece6;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #f97316;
  --primary-dark: #dc6803;
  --border: #e5e7eb;
  --radius: 24px;
  --header-height: 88px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding-top: var(--header-height);
  font-family:
    Inter,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1440px, calc(100% - clamp(2rem, 7vw, 7rem)));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #edf2f7;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: nowrap;
  padding: 1.25rem 0;
}

.brand {
  flex: 0 0 auto;
  font-weight: 800;
  letter-spacing: 0.05em;
  font-size: 1.2rem;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
  flex: 1 1 auto;
  flex-wrap: nowrap;
  justify-content: center;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.main-nav::-webkit-scrollbar {
  display: none;
}

.main-nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.header-actions {
  display: flex;
  flex: 0 0 auto;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.85rem 1.6rem;
  font-weight: 600;
  transition:
    transform 0.2s ease,
    background-color 0.2s ease,
    color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}

.btn-secondary {
  color: var(--text);
  background: var(--surface);
  border: 1px solid #d1d5db;
}

.hero {
  padding: clamp(2.5rem, 6vh, 5rem) 0 clamp(1.5rem, 4vh, 3rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid #f8c29e;
  color: var(--primary-dark);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

.hero-copy h1 {
  font-size: clamp(2.8rem, 4vw, 4.5rem);
  margin: 0;
  line-height: 1.02;
}

.hero-copy p {
  max-width: 42rem;
  color: var(--muted);
  margin: 2rem 0 2.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.3rem;
}

.hero-meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.08);
  padding: 1.5rem;
  width: min(100%, 520px);
  justify-self: center;
}

.stat-card {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: center;
  background: #fef4ed;
  border-radius: 1.25rem;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: var(--surface-strong);
  border-radius: 1.25rem;
  padding: 1rem;
  text-align: center;
}

.stat-box strong {
  display: block;
  font-size: 1.5rem;
}

.dashboard-card {
  background: #e5f6ff;
  border-radius: 1.75rem;
  padding: 1.5rem;
}

.dashboard-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.dashboard-row:last-child {
  border-bottom: none;
}

.dashboard-row.muted {
  color: var(--muted);
}

.trusted-brands {
  padding: clamp(1.5rem, 3vh, 2.5rem) 0;
}

.trusted-brands p {
  margin: 0 0 1rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.85rem;
  color: var(--muted);
}

.brand-logos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  color: var(--muted);
}

.features-section,
.cards-section,
.steps-section,
.pricing-section,
.subscribe-section {
  padding: clamp(3rem, 7vh, 5rem) 0;
}

.features-section {
  padding-top: clamp(2rem, 4vh, 3rem);
}

.section-heading {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem;
}

.section-heading h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 2.5vw, 3rem);
}

.section-heading p {
  color: var(--muted);
}

.feature-grid,
.cards-grid,
.steps-grid,
.pricing-grid {
  display: grid;
  gap: 2rem;
}

.feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.course-levels {
  display: grid;
  gap: 1rem;
}

.level-card {
  background: var(--surface);
  border: 1px solid transparent;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  transition:
    border-color 0.2s ease,
    border-radius 0.2s ease,
    box-shadow 0.2s ease,
    padding 0.2s ease;
}

.level-card.is-expanded {
  border-color: var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.05);
}

.level-heading {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  padding: 1.25rem 0;
  color: inherit;
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.level-heading .eyebrow {
  margin-bottom: 0;
}

.level-heading strong {
  color: var(--primary-dark);
  white-space: nowrap;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  padding-top: 1.5rem;
}

.feature-card,
.card,
.step-card,
.pricing-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2.2rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.05);
}

.feature-card.is-selected {
  border: 1px solid rgba(249, 115, 22, 0.22);
  box-shadow: 0 24px 50px rgba(249, 115, 22, 0.1);
}

.feature-card h3,
.card h3,
.step-card h3,
.pricing-card h3 {
  margin-top: 0;
}

.course-meta {
  color: var(--primary-dark);
  font-weight: 700;
  margin-bottom: 0;
}

.course-choice {
  margin-top: 1rem;
}

.chapter-panel {
  margin-top: 1.25rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.chapter-panel h4 {
  margin: 0 0 0.75rem;
}

.chapter-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.chapter-list li + li {
  margin-top: 0.45rem;
}

.chapter-button {
  display: block;
  width: 100%;
  border: 1px solid transparent;
  border-radius: 0.85rem;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  padding: 0.55rem 0.7rem;
  text-align: left;
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}

.chapter-button:hover,
.chapter-button.is-active {
  background: #fff7ed;
  border-color: #fed7aa;
  color: var(--primary-dark);
}

.chapter-detail {
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.08);
  padding: clamp(1.4rem, 3vw, 2.5rem);
}

.chapter-detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.chapter-detail-header .eyebrow {
  margin-bottom: 0.8rem;
}

.chapter-detail h3 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.1;
}

.chapter-detail-header p {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.chapter-detail-badge {
  flex: 0 0 auto;
  border-radius: 999px;
  background: #fff7ed;
  color: var(--primary-dark);
  font-weight: 700;
  padding: 0.55rem 1rem;
}

.chapter-detail-body {
  display: grid;
  gap: 1.35rem;
}

.chapter-detail-body section {
  max-width: 920px;
}

.chapter-detail h4 {
  margin: 0 0 0.55rem;
  font-size: 1.1rem;
}

.chapter-detail p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.chapter-topic-list {
  margin: 0.85rem 0;
  padding-left: 1.2rem;
  color: var(--text);
}

.chapter-topic-list li + li {
  margin-top: 0.35rem;
}

.chapter-tip {
  border-radius: 1rem;
  background: #f8fafc;
  padding: 1rem;
}

.chapter-page {
  background: #f8fafc;
}

.chapter-reading-section {
  padding: clamp(2rem, 5vh, 4rem) 0 clamp(4rem, 8vh, 6rem);
}

.chapter-reading-card {
  max-width: 1040px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.08);
  padding: clamp(1.5rem, 4vw, 4rem);
}

.hidden {
  display: none !important;
}

.test-quiz-section {
  padding: clamp(3rem, 7vh, 5rem) 0;
}

#quiz-container {
  max-width: 860px;
  margin: 0 auto;
}

.quiz-error {
  display: block;
  margin: 1rem 0 0;
  padding: 1rem 1.25rem;
  border-radius: 1rem;
  border: 1px solid #fecaca;
  background: #fee2e2;
  color: #b91c1c;
}

.quiz-question {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.quiz-question legend {
  font-weight: 700;
  margin-bottom: 1rem;
}

.quiz-option {
  display: block;
  padding: 0.85rem 1rem;
  border-radius: 0.95rem;
  background: #f8fafc;
  margin-top: 0.75rem;
  cursor: pointer;
}

.quiz-option input {
  margin-right: 0.75rem;
}

.quiz-actions {
  margin-top: 1.5rem;
  text-align: right;
}

.quiz-summary,
.quiz-feedback {
  border-radius: 1.5rem;
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.quiz-summary {
  background: #f8fafc;
  border: 1px solid #dbeafe;
}

.quiz-feedback {
  background: #fff7ed;
  border: 1px solid #ffe4c7;
}

.quiz-feedback h4 {
  margin-top: 0;
}

.chapter-reading-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.chapter-reading-header .eyebrow {
  margin-bottom: 1rem;
}

.chapter-reading-header h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  line-height: 1.05;
}

.chapter-reading-header p {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.chapter-reading-body {
  display: grid;
  gap: 2rem;
  max-width: 880px;
}

.chapter-reading-body h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.chapter-reading-body p,
.chapter-reading-list {
  color: var(--text);
  font-size: 1.08rem;
  line-height: 1.8;
}

.chapter-reading-list {
  margin: 0;
  padding-left: 1.35rem;
}

.chapter-reading-list li + li {
  margin-top: 0.5rem;
}

.chapter-topic-title {
  font-weight: 700;
}

.chapter-topic-subpoints {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.65;
  margin: 0.45rem 0 0;
  padding-left: 1.25rem;
}

.chapter-topic-subpoints li + li {
  margin-top: 0.25rem;
}

.chapter-reading-tip {
  border-radius: 1rem;
  background: #fff7ed;
  padding: 1.25rem;
}

.chapter-reading-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  margin-top: 2.25rem;
}

.cards-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.steps-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.step-card {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: rgba(249, 115, 22, 0.12);
  color: var(--primary-dark);
  font-weight: 700;
}

.pricing-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.pricing-card.featured {
  border: 1px solid rgba(249, 115, 22, 0.16);
  box-shadow: 0 30px 60px rgba(249, 115, 22, 0.12);
}

.price {
  font-size: 2rem;
  margin: 0.5rem 0;
}

.price span {
  font-size: 1rem;
  color: var(--muted);
}

.pricing-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.pricing-card li {
  color: var(--muted);
}

.subscribe-panel {
  display: grid;
  grid-template-columns: 1.3fr 1.7fr;
  gap: 2rem;
  align-items: center;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.08);
}

.subscribe-form {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.subscribe-form input {
  flex: 1;
  min-width: 220px;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  outline: none;
}

.site-footer {
  background: var(--surface);
  padding: 2.5rem 0 1rem;
  border-top: 1px solid #f1f5f9;
}

.footer-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-grid h4 {
  margin: 0 0 0.75rem;
}

.footer-grid a {
  display: inline-flex;
  margin: 0 0.5rem 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0;
}

.footer-socials-secondary {
  margin-top: 0.5rem;
}

.footer-socials a,
.footer-socials span {
  display: inline-flex;
}

/* Quiz Modal Styles */
#quiz-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.quiz-container {
  background: var(--surface);
  border-radius: var(--radius);
  max-width: 800px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.quiz-header h2 {
  margin: 0;
  font-size: 1.5rem;
}

.close-quiz {
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--muted);
  padding: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
}

.close-quiz:hover {
  background: var(--surface-strong);
}

.quiz-content {
  overflow-y: auto;
  flex: 1;
  padding: 1.5rem;
}

.chapter-questions {
  margin-bottom: 2rem;
}

.chapter-name {
  font-size: 1.1rem;
  color: var(--primary);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary);
}

.question-card {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--surface-strong);
  border-radius: 12px;
}

.question-header {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.question-number {
  background: var(--primary);
  color: white;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: bold;
}

.question-text {
  margin: 0;
  font-weight: 500;
  flex: 1;
}

.options-list {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.option-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: background-color 0.2s;
}

.option-label:hover {
  background: rgba(249, 115, 22, 0.1);
}

.option-label input[type="radio"] {
  cursor: pointer;
}

.question-details {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.question-details summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 500;
  user-select: none;
}

.question-details p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.quiz-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

.performance-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  margin-top: 2rem;
}

.performance-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.performance-table-wrapper {
  overflow-x: auto;
  margin-top: 1.5rem;
}

.performance-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.performance-table th,
.performance-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.performance-table th {
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.performance-table td {
  font-size: 0.96rem;
}

.performance-no-data {
  padding: 2rem 1rem;
  border: 1px dashed var(--border);
  border-radius: 1rem;
  background: var(--surface-strong);
  margin-top: 1.5rem;
}

.performance-details {
  margin-top: 0.75rem;
  color: var(--muted);
}

/* Quiz Page Styles */
.quiz-page {
  padding: 2rem 0;
}

.quiz-section {
  background: var(--bg);
}

.quiz-title-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
}

.quiz-title-card h1 {
  margin: 0.5rem 0 0;
}

.quiz-info {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  border-left: 4px solid var(--primary);
}

.quiz-stats {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text);
}

.chapter-section {
  margin-bottom: 3rem;
}

.chapter-heading {
  font-size: 1.3rem;
  color: var(--primary);
  margin: 0 0 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--primary);
}

.questions-container {
  display: grid;
  gap: 1.5rem;
}

.question-card {
  background: var(--surface);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
  border-left: 4px solid var(--border);
  transition: all 0.2s ease;
}

.question-card:hover {
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
  border-left-color: var(--primary);
}

.question-header {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}

.question-number {
  background: var(--primary);
  color: white;
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: bold;
  font-size: 1rem;
}

.question-text {
  margin: 0;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.5;
}

.options-list {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.option-label {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  background: transparent;
}

.option-label:hover {
  background: rgba(249, 115, 22, 0.05);
  border-color: var(--primary);
}

.option-label input[type="radio"] {
  margin-top: 0.25rem;
  cursor: pointer;
  flex-shrink: 0;
}

.option-label input[type="radio"]:checked + span {
  font-weight: 600;
  color: var(--primary);
}

.question-details {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.question-details summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 600;
  user-select: none;
  padding: 0.5rem;
  margin: -0.5rem;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.question-details summary:hover {
  background: rgba(249, 115, 22, 0.1);
}

.question-details p {
  margin: 0.75rem 0 0;
  padding: 0.75rem;
  background: rgba(249, 115, 22, 0.05);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .quiz-title-card {
    padding: 1.5rem;
  }

  .question-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .question-number {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 0.9rem;
  }

  .quiz-section {
    padding: 1rem 0;
  }
}

.footer-note {
  margin-top: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-socials a:hover {
  background: #f1f5f9;
}

.footer-socials svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.footer-note {
  margin-top: 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 1120px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 3rem 0 1.5rem;
  }

  .hero-panel {
    margin-top: 2rem;
  }
}

@media (max-width: 960px) {
  .container {
    padding: 0 1rem;
  }

  .site-header {
    padding: 0 0.5rem;
  }

  .header-inner {
    gap: 1rem;
  }

  .hero-grid,
  .cards-grid,
  .pricing-grid,
  .feature-grid,
  .subject-grid,
  .steps-grid {
    grid-template-columns: 1fr;
  }

  .main-nav {
    gap: 1rem;
  }

  .header-actions {
    gap: 0.5rem;
  }

  .hero-panel,
  .cards-grid,
  .pricing-grid,
  .subscribe-panel {
    padding: 1.75rem;
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 82px;
  }

  .header-inner {
    overflow-x: auto;
    padding: 1rem 0;
    scrollbar-width: none;
  }

  .header-inner::-webkit-scrollbar {
    display: none;
  }

  .main-nav {
    gap: 0.75rem;
  }

  .main-nav a {
    white-space: nowrap;
  }

  .brand {
    font-size: 1rem;
    white-space: nowrap;
  }

  .header-actions .btn {
    padding: 0.7rem 1rem;
    white-space: nowrap;
  }

  .level-heading {
    align-items: flex-start;
    flex-direction: row;
  }

  .hero {
    padding-top: 2rem;
  }

  .hero-copy h1 {
    font-size: clamp(2.4rem, 8vw, 3rem);
  }

  .hero-copy p {
    margin-bottom: 1rem;
  }

  .subscribe-panel {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .chapter-detail-header {
    flex-direction: column;
  }

  .chapter-detail-badge {
    align-self: flex-start;
  }
}