/* ========================================
   Circlearn — Modern Minimalist
   ======================================== */

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #f8f9fc;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-muted: #9ca3af;
  --color-primary: #1e3a5f;
  --color-primary-light: #3b82f6;
  --color-primary-bg: #eff6ff;
  --color-primary-subtle: #dbeafe;
  --color-accent: #6366f1;
  --color-accent-warm: #c084fc;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;

  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'DM Serif Display', Georgia, serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 7rem;
  --space-3xl: 10rem;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 0 1px rgba(59, 130, 246, 0.1), 0 4px 16px rgba(59, 130, 246, 0.08);

  --max-width: 1200px;
  --nav-height: 72px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 1rem);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover { color: var(--color-primary-light); }

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* --- Section primitives --- */
.section-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

/* --- Button --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(30, 58, 95, 0.25);
}

.btn--primary:hover {
  background: #16304f;
  color: #fff;
  box-shadow: 0 6px 20px rgba(30, 58, 95, 0.35);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
  color: var(--color-primary);
}

/* ========================================
   Navigation
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(248, 249, 252, 0.8);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  z-index: 1000;
  transition: box-shadow 0.4s, background 0.4s;
}

.nav--scrolled {
  box-shadow: 0 1px 0 var(--color-border);
  background: rgba(248, 249, 252, 0.95);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
}

.nav__logo:hover { opacity: 0.85; }

.nav__logo-img {
  height: 40px;
  width: auto;
  mix-blend-mode: multiply;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav__link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary-light);
  transition: all 0.3s var(--ease-out);
  transform: translateX(-50%);
  border-radius: 1px;
}

.nav__link:hover { color: var(--color-text); }
.nav__link:hover::after { width: 100%; }

.nav__link--cta {
  background: var(--color-primary);
  color: #fff;
  padding: 0.45rem 1.2rem;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
}

.nav__link--cta:hover {
  background: #16304f;
  color: #fff;
}

.nav__link--cta::after { display: none; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
  transform-origin: center;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  position: relative;
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 0;
  background: linear-gradient(180deg, #eef4ff 0%, var(--color-bg) 100%);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__circles {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  transform: translate(-50%, -55%);
  color: var(--color-primary-light);
  opacity: 0.1;
}

.hero__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  background: var(--color-primary-bg);
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-lg);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero__title em {
  color: var(--color-primary-light);
  font-style: italic;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-lg);
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.hero__features-wrapper {
  position: relative;
  z-index: 1;
  margin-top: calc(-1 * var(--space-xl));
  padding-bottom: var(--space-2xl);
}

.hero__features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 860px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.hero__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  text-align: left;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s;
}

.hero__feature:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hero__feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-bg);
  border-radius: var(--radius-md);
  color: var(--color-primary-light);
  flex-shrink: 0;
}

.hero__feature strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
  color: var(--color-text);
}

.hero__feature p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ========================================
   About
   ======================================== */
.about {
  padding: var(--space-2xl) 0;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-xl);
  align-items: start;
}

.about__photo {
  width: 100%;
  border-radius: 40px;
  object-fit: cover;
  aspect-ratio: 3 / 4;
  position: sticky;
  top: calc(var(--nav-height) + var(--space-md));
}

.about__content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
}

.about__content p:last-of-type {
  margin-bottom: var(--space-lg);
}

.about__values {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
}

.about__value {
  text-align: center;
  padding: var(--space-md) var(--space-sm);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s var(--ease-out);
}

.about__value:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.about__value-label {
  display: block;
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.about__value-desc {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ========================================
   Quote Section
   ======================================== */
.quote-section {
  padding: var(--space-2xl) 0;
  background: var(--color-primary);
  position: relative;
  overflow: hidden;
}

.quote-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.03);
}

.quote-section::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.02);
}

.quote {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

.quote__mark {
  display: block;
  margin: 0 auto var(--space-sm);
  color: #fff;
}

.quote p {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-style: italic;
  color: #fff;
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.quote cite {
  font-style: normal;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ========================================
   Courses
   ======================================== */
.courses {
  padding: var(--space-2xl) 0;
}

.courses__header {
  margin-bottom: var(--space-lg);
}

.courses__tabs {
  display: inline-flex;
  gap: 4px;
  margin-bottom: var(--space-lg);
  background: var(--color-border-light);
  padding: 4px;
  border-radius: var(--radius-xl);
}

.courses__tab {
  padding: 0.6rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all 0.25s var(--ease-out);
}

.courses__tab:hover {
  color: var(--color-text);
}

.courses__tab--active {
  color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.courses__panel { display: none; }

.courses__panel--active {
  display: block;
  animation: fadeUp 0.4s var(--ease-out);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.courses__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
}

/* Course Card */
.course-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  transition: all 0.35s var(--ease-out);
}

.course-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.course-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.course-card__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-light);
  background: var(--color-primary-bg);
  padding: 4px 12px;
  border-radius: var(--radius-xl);
}

.course-card__tag--accent {
  color: var(--color-accent);
  background: #eef2ff;
}

.course-card__level {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.course-card__title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 400;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.course-card__desc {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.course-card__details {
  list-style: none;
}

.course-card__details li {
  font-size: 0.84rem;
  color: var(--color-text-secondary);
  padding: 7px 0;
  padding-left: 20px;
  position: relative;
}

.course-card__details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: 1.5px solid var(--color-primary-light);
  transform: translateY(-50%);
}

.course-card__details li + li {
  border-top: 1px solid var(--color-border-light);
}

/* ========================================
   Materials
   ======================================== */
.materials {
  padding: var(--space-2xl) 0;
  background: linear-gradient(180deg, var(--color-bg) 0%, #eef4ff 100%);
}

.materials__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.material-item {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.material-item:hover {
  border-color: var(--color-primary-subtle);
}

.material-item--open {
  box-shadow: var(--shadow-md);
}

.material-item__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
}

.material-item__header {
  flex: 1;
}

.material-item__arrow {
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition: transform 0.3s var(--ease-out);
}

.material-item--open .material-item__arrow {
  transform: rotate(180deg);
}

.material-item__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 4px;
  color: var(--color-text);
}

.material-item__aim {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.material-item__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease-out);
}

.material-item--open .material-item__body {
  max-height: 3000px;
}

.material-item__content {
  padding: 0 var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--space-lg);
}

.material-item__content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  margin-top: var(--space-lg);
}

.material-item__content h4:first-child {
  margin-top: 0;
}

.material-item__content h5 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-md);
}

.material-item__content ol {
  padding-left: 1.4rem;
  margin-bottom: var(--space-md);
}

.material-item__content ol li {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  padding: 4px 0;
  line-height: 1.6;
}

.material-item__content p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-sm);
}

.material-email {
  background: var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  border-left: 3px solid var(--color-primary-light);
}

.material-email p {
  font-size: 0.88rem;
}

.material-card__level {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 12px;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-xs);
}

.material-card__level--elementary {
  background: #dbeafe;
  color: #1d4ed8;
}

.material-card__level--intermediate {
  background: #fef3c7;
  color: #b45309;
}

.material-card__level--advanced {
  background: #fce7f3;
  color: #be185d;
}

/* ========================================
   Testimonials
   ======================================== */
.testimonials {
  padding: var(--space-2xl) 0;
}

.testimonials__grid {
  columns: 3;
  column-gap: var(--space-md);
}

.testimonial-card {
  break-inside: avoid;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  transition: all 0.35s var(--ease-out);
}

.testimonial-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.testimonial-card--featured {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.testimonial-card--featured:hover {
  border-color: var(--color-primary);
}

.testimonial-card__text {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.testimonial-card--featured .testimonial-card__text {
  color: rgba(255, 255, 255, 0.85);
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.testimonial-card__avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-primary-bg);
  color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.testimonial-card--featured .testimonial-card__avatar {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.testimonial-card__author strong {
  display: block;
  font-size: 0.88rem;
  color: var(--color-text);
}

.testimonial-card--featured .testimonial-card__author strong {
  color: #fff;
}

.testimonial-card__author span {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.testimonial-card--featured .testimonial-card__author span {
  color: rgba(255, 255, 255, 0.5);
}

/* ========================================
   Contact
   ======================================== */
.contact {
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.contact__centered {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.contact__centered > p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.contact__channels {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

.contact__channel {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.9rem 1.6rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  transition: all 0.3s var(--ease-out);
}

.contact__channel:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-glow);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.contact__channel svg {
  color: var(--color-primary-light);
  flex-shrink: 0;
}

.contact__channel strong {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.5);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-lg);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: var(--space-xs);
  display: block;
}

.footer__logo:hover { color: #fff; }

.footer__brand p { font-size: 0.85rem; }

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__links a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s;
}

.footer__links a:hover { color: #fff; }

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-md);
}

.footer__bottom p {
  font-size: 0.8rem;
  text-align: center;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 960px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .about__photo {
    aspect-ratio: 16 / 9;
    max-height: 360px;
    position: static;
  }

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

  .testimonials__grid { columns: 2; }

  .footer__content {
    flex-direction: column;
    gap: var(--space-md);
  }
}

@media (max-width: 768px) {
  :root {
    --space-2xl: 4rem;
    --space-3xl: 6rem;
  }

  /* Mobile nav */
  .nav__toggle { display: flex; }

  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: var(--space-md);
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease-out), opacity 0.35s;
  }

  .nav__menu--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav__link {
    display: block;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
    font-size: 1rem;
  }

  .nav__link::after { display: none; }

  .nav__link--cta {
    text-align: center;
    margin-top: var(--space-sm);
    border-bottom: none;
    display: block;
  }

  .nav__toggle--active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav__toggle--active span:nth-child(2) { opacity: 0; }

  .nav__toggle--active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Hero */
  .hero__features {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  /* Courses */
  .courses__tabs {
    width: 100%;
    justify-content: center;
  }

  .courses__grid { grid-template-columns: 1fr; }

  /* Testimonials */
  .testimonials__grid { columns: 1; }

  /* Materials — already single column */

  /* Contact */
  .contact__channels {
    flex-direction: column;
    align-items: center;
  }

  .contact__channel { width: 100%; max-width: 300px; justify-content: center; }

  /* Footer */
  .footer__links {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .about__values { grid-template-columns: 1fr; }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .hero__actions .btn {
    width: 100%;
    max-width: 280px;
  }

  .courses__tabs {
    flex-direction: column;
    align-items: stretch;
  }

  .courses__tab { text-align: center; }
}