/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgb(250 248 245 / 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.site-logo__mark {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink-muted);
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
}

.nav-toggle__summary {
  list-style: none;
  cursor: pointer;
}

.nav-toggle__summary::-webkit-details-marker {
  display: none;
}

.nav-toggle__icon {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 1.5rem;
}

.nav-toggle__icon span {
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.2s ease;
}

.nav-toggle[open] .nav-toggle__icon span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[open] .nav-toggle__icon span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[open] .nav-toggle__icon span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(4rem, 10vw, 7rem);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 15%, rgb(232 108 74 / 0.12) 0%, transparent 45%),
    radial-gradient(circle at 10% 80%, rgb(30 58 95 / 0.08) 0%, transparent 40%);
  pointer-events: none;
}

.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  margin-bottom: 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

.hero__badge-dot {
  width: 0.5rem;
  height: 0.5rem;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-ink);
  margin: 0 0 1.25rem;
}

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

.hero__text {
  font-size: 1.125rem;
  color: var(--color-ink-muted);
  max-width: 32rem;
  margin: 0 0 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero__trust {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.hero__trust-item {
  display: flex;
  flex-direction: column;
}

.hero__trust-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.hero__trust-label {
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__card {
  position: relative;
  width: 100%;
  max-width: 26rem;
  padding: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.hero__card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.hero__card-icon {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 1.25rem;
  border-radius: var(--radius-md);
}

.hero__card-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.hero__card-sub {
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
  margin: 0;
}

.hero__schedule {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hero__schedule-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.875rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
}

.hero__schedule-time {
  flex-shrink: 0;
  font-weight: 600;
  color: var(--color-primary);
  min-width: 4.5rem;
}

.hero__float {
  position: absolute;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.hero__float--top {
  top: -1rem;
  right: -0.5rem;
}

.hero__float--bottom {
  bottom: -1rem;
  left: -0.5rem;
  background: var(--color-accent);
}

/* Stats */
.stats {
  padding: 0 0 4rem;
  margin-top: -2rem;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding: 2rem;
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.stats__item {
  text-align: center;
  padding: 0.5rem;
  color: #fff;
}

.stats__number {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
}

.stats__label {
  font-size: 0.875rem;
  color: rgb(255 255 255 / 0.75);
}

.section-intro--spaced {
  margin-bottom: 2rem;
}

/* About */
.about {
  padding: 5rem 0;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: start;
}

.about__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.feature-card {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.feature-card__icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: 1rem;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  font-size: 1.125rem;
  border-radius: var(--radius-sm);
}

.feature-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.375rem;
}

.feature-card__text {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  margin: 0;
  line-height: 1.5;
}

/* Courses */
.courses {
  padding: 5rem 0;
  background: var(--color-bg-alt);
}

.courses__header {
  text-align: center;
  margin-bottom: 3rem;
}

.courses__header .section-intro {
  margin-inline: auto;
}

.courses__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.course-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.course-card__visual {
  display: grid;
  place-items: center;
  height: 8rem;
  font-size: 2.5rem;
}

.course-card__visual--science { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.course-card__visual--math { background: linear-gradient(135deg, #fdeee9, #fcd5c8); }
.course-card__visual--competitive { background: linear-gradient(135deg, #e8f5e9, #c8e6c9); }

.course-card__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
}

.course-card__tag {
  display: inline-block;
  width: fit-content;
  padding: 0.25rem 0.625rem;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
}

.course-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.course-card__text {
  flex: 1;
  font-size: 0.9375rem;
  color: var(--color-ink-muted);
  margin: 0 0 1.25rem;
}

.course-card__link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
}

.course-card__link:hover {
  text-decoration: underline;
}

/* Why us */
.why-us {
  padding: 5rem 0;
}

.why-us__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.why-us__list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.why-us__item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.why-us__number {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 50%;
}

.why-us__item-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.why-us__item-text {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  margin: 0;
}

.why-us__panel {
  padding: 2.5rem;
  background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--radius-lg);
  color: #fff;
}

.why-us__panel-quote {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-style: italic;
  line-height: 1.5;
  margin: 0 0 1.5rem;
}

.why-us__panel-author {
  font-size: 0.9375rem;
  font-weight: 600;
}

.why-us__panel-role {
  font-size: 0.8125rem;
  color: rgb(255 255 255 / 0.7);
}

/* Testimonials */
.testimonials {
  padding: 5rem 0;
  background: var(--color-bg-alt);
}

.testimonials__header {
  text-align: center;
  margin-bottom: 3rem;
}

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  padding: 1.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.testimonial-card__stars {
  color: #f5a623;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.testimonial-card__text {
  font-size: 0.9375rem;
  color: var(--color-ink-muted);
  margin: 0 0 1.25rem;
  line-height: 1.6;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.testimonial-card__avatar {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-bg-alt);
  border-radius: 50%;
}

.testimonial-card__name {
  font-size: 0.9375rem;
  font-weight: 600;
}

.testimonial-card__course {
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}

/* CTA */
.cta {
  padding: 5rem 0;
}

.cta__box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(135deg, var(--color-accent) 0%, #d85a38 100%);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 40px rgb(232 108 74 / 0.3);
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.5rem;
}

.cta__text {
  font-size: 1rem;
  color: rgb(255 255 255 / 0.9);
  margin: 0;
  max-width: 28rem;
}

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

.cta .btn--primary {
  background: #fff;
  color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

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

/* Footer */
.site-footer {
  padding: 4rem 0 2rem;
  background: var(--color-primary-dark);
  color: rgb(255 255 255 / 0.85);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.site-footer__brand p {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgb(255 255 255 / 0.65);
  margin: 1rem 0 0;
  max-width: 18rem;
}

.site-footer__heading {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
  margin: 0 0 1.25rem;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.site-footer__links a {
  font-size: 0.9375rem;
  color: rgb(255 255 255 / 0.65);
  transition: color 0.2s ease;
}

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

.site-footer__contact-item {
  display: flex;
  gap: 0.5rem;
  font-size: 0.9375rem;
  color: rgb(255 255 255 / 0.65);
  margin-bottom: 0.625rem;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid rgb(255 255 255 / 0.1);
  font-size: 0.8125rem;
  color: rgb(255 255 255 / 0.5);
}

.site-logo--footer .site-logo__mark {
  background: rgb(255 255 255 / 0.15);
}

.site-logo--footer {
  color: #fff;
}

/* Floating WhatsApp */
.whatsapp-float {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 200;
  display: grid;
  place-items: center;
  width: 3.75rem;
  height: 3.75rem;
  background: #25d366;
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 20px rgb(37 211 102 / 0.45);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.whatsapp-float svg {
  width: 1.75rem;
  height: 1.75rem;
}

.whatsapp-float:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgb(37 211 102 / 0.55);
}

.whatsapp-float__pulse {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #25d366;
  animation: whatsapp-pulse 2s ease-out infinite;
  z-index: -1;
}

@keyframes whatsapp-pulse {
  0% {
    transform: scale(1);
    opacity: 0.6;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

/* Responsive */
@media (max-width: 960px) {
  .hero__grid,
  .about__grid,
  .why-us__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero__visual {
    order: -1;
  }

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

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

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

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
    position: relative;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    min-width: 14rem;
    padding: 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
  }

  .nav-toggle[open] .site-nav {
    display: flex;
  }

  .site-nav a {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
  }

  .site-nav a:hover {
    background: var(--color-bg);
  }

  .site-header__inner .btn--primary {
    display: none;
  }

  .hero__float {
    display: none;
  }

  .stats__grid {
    grid-template-columns: 1fr 1fr;
    padding: 1.5rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .cta__box {
    flex-direction: column;
    text-align: center;
  }

  .cta__actions {
    justify-content: center;
  }

  .whatsapp-float {
    right: 1rem;
    bottom: 1rem;
    width: 3.25rem;
    height: 3.25rem;
  }

  .whatsapp-float svg {
    width: 1.5rem;
    height: 1.5rem;
  }
}