/*
  LearnThis — Landing page e-learning
  Projet 3.3 · Akieni Academy · HTML & CSS avancé

  Structure :
    1. Variables CSS (:root)
    2. Reset personnalisé
    3. Classes utilitaires
    4. Header
    5. Hero
    6. Fonctionnalités
    7. Témoignages
    8. Tarifs
    9. CTA
   10. Footer
   11. Accessibilité (focus)
   12. Responsive
*/


/* --- 1. VARIABLES CSS --- */
:root {
  --primary-color: #039ff4;
  --primary-dark: #028df1;
  --primary-light: #4fbcf7;
  --primary-soft: #e8f6fe;
  --accent-color: #ff8a3d;

  --ink: #141522;
  --ink-muted: rgba(20, 21, 34, 0.68);
  --surface: #ffffff;
  --surface-alt: #f5f6fb;
  --border: rgba(20, 21, 34, 0.1);

  --shadow: 0 18px 48px rgba(20, 21, 34, 0.1);
  --radius: 1rem;
  --radius-lg: 1.5rem;

  --container: 1120px;
  --page-x: clamp(1.25rem, 4vw, 2.5rem);
  --font: "Manrope", "Segoe UI", system-ui, sans-serif;
  --header-height: 4.5rem;
}


/* --- 2. RESET PERSONNALISÉ --- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  min-height: 100%;
  overflow-x: clip;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
}

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

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

input {
  font: inherit;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
p {
  margin: 0;
}

address {
  font-style: normal;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


/* --- 3. CLASSES UTILITAIRES --- */
.container {
  width: min(var(--container), calc(100% - (var(--page-x) * 2)));
  margin-inline: auto;
}

#accueil,
#fonctionnalites,
#avis,
#tarifs,
#contact {
  scroll-margin-top: var(--header-height);
}

.section-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-color);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  overflow-wrap: break-word;
}

.section-lead {
  margin-top: 0.85rem;
  max-width: 38rem;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.75rem 1.35rem;
  border: 0;
  border-radius: 999px;
  background: var(--primary-color);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  box-shadow: inset 0 0 0 2px var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-soft);
}


/* --- 4. HEADER --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.site-header > .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand span {
  color: var(--primary-color);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

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


/* --- 5. HERO --- */
.hero {
  padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(4rem, 9vw, 6rem);
  background:
    radial-gradient(circle at 85% 15%, rgba(3, 159, 244, 0.14), transparent 28%),
    radial-gradient(circle at 10% 80%, rgba(255, 138, 61, 0.1), transparent 24%),
    var(--surface-alt);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.hero-copy h1 span {
  color: var(--primary-color);
}

.hero-copy > p {
  margin-top: 1.1rem;
  max-width: 34rem;
  color: var(--ink-muted);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
}

.hero-stats > li {
  min-width: 7rem;
}

.hero-stats > li:first-of-type strong {
  color: var(--primary-dark);
}

.hero-stats strong {
  display: block;
  font-size: 1.45rem;
  line-height: 1.1;
  color: var(--primary-color);
}

.hero-stats span {
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.hero-visual {
  margin: 0;
}

.hero-visual img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}


/* --- 6. FONCTIONNALITÉS --- */
.features {
  padding: clamp(4rem, 8vw, 6rem) 0;
}

.features-header {
  max-width: 42rem;
  margin-bottom: 2.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.feature-card {
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.feature-icon {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 1rem;
  border-radius: 0.9rem;
  background: var(--primary-soft);
}

.feature-icon img {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
}

.feature-card h3 {
  margin-bottom: 0.55rem;
  font-size: 1.15rem;
}

.feature-card p {
  color: var(--ink-muted);
  font-size: 0.96rem;
}

.features-grid > .feature-card:first-of-type {
  border-color: var(--primary-color);
}

.features-grid .feature-card:nth-child(2) .feature-icon {
  background: color-mix(in srgb, var(--accent-color) 18%, white);
}

.features-grid .feature-card:nth-child(3) .feature-icon {
  background: color-mix(in srgb, var(--primary-light) 22%, white);
}


/* --- 7. TÉMOIGNAGES --- */
.testimonials {
  padding: clamp(4rem, 8vw, 6rem) 0;
  background: var(--surface-alt);
  overflow-x: clip;
}

.testimonials-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2rem;
  align-items: center;
}

.testimonials-layout > * {
  min-width: 0;
}

.testimonial-slider {
  position: relative;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
}

.testimonial-radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.testimonial-viewport {
  overflow: hidden;
  width: 100%;
  max-width: 100%;
  border-radius: var(--radius-lg);
}

.testimonial-track {
  display: flex;
  width: 300%;
  transition: transform 0.45s ease;
}

.testimonial-slide {
  flex: 0 0 33.3333%;
  width: 33.3333%;
  min-width: 0;
  max-width: 33.3333%;
  padding: 0.125rem;
  box-sizing: border-box;
}

.testimonial-card {
  width: 100%;
  max-width: 100%;
  min-height: 16rem;
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  box-sizing: border-box;
}

.testimonial-card blockquote {
  margin: 0;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.testimonial-author > div {
  min-width: 0;
  overflow-wrap: break-word;
}

.avatar-photo {
  flex-shrink: 0;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 999px;
  object-fit: cover;
  object-position: center top;
  border: 2px solid var(--primary-soft);
  box-shadow: 0 4px 12px rgba(3, 159, 244, 0.18);
}

.testimonial-author strong {
  display: block;
  font-size: 0.95rem;
}

.testimonial-author cite {
  font-style: normal;
}

.testimonial-author span {
  color: var(--ink-muted);
  font-size: 0.84rem;
}

#review-1:checked ~ .testimonial-viewport .testimonial-track {
  transform: translateX(0%);
}

#review-2:checked ~ .testimonial-viewport .testimonial-track {
  transform: translateX(-33.333%);
}

#review-3:checked ~ .testimonial-viewport .testimonial-track {
  transform: translateX(-66.666%);
}

.testimonial-dots {
  display: flex;
  gap: 0.55rem;
  margin-top: 1rem;
}

.testimonial-dots label {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 999px;
  background: rgba(20, 21, 34, 0.18);
  cursor: pointer;
}

#review-1:checked ~ .testimonial-dots label[for="review-1"],
#review-2:checked ~ .testimonial-dots label[for="review-2"],
#review-3:checked ~ .testimonial-dots label[for="review-3"] {
  background: var(--primary-color);
  transform: scale(1.15);
}

#review-1:focus-visible ~ .testimonial-dots label[for="review-1"],
#review-2:focus-visible ~ .testimonial-dots label[for="review-2"],
#review-3:focus-visible ~ .testimonial-dots label[for="review-3"] {
  outline: 3px solid rgba(3, 159, 244, 0.55);
  outline-offset: 3px;
}


/* --- 8. TARIFS --- */
.pricing {
  padding: clamp(4rem, 8vw, 6rem) 0;
}

.pricing-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.pricing-header .section-lead {
  margin-inline: auto;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: stretch;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.pricing-card h3 {
  font-size: 1.15rem;
}

.pricing-price {
  margin: 0.85rem 0 1.15rem;
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.pricing-price span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.pricing-list {
  flex: 1;
  margin-bottom: 1.5rem;
}

.pricing-list li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--ink-muted);
  font-size: 0.94rem;
}

.pricing-list li + li {
  margin-top: 0.65rem;
}

.pricing-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: 800;
}

.pricing-card .btn {
  width: 100%;
  margin-top: auto;
}

.pricing-card-featured {
  border-color: var(--primary-color);
  background: linear-gradient(180deg, #fafbff 0%, #fff 100%);
  box-shadow: var(--shadow);
  transform: translateY(-0.35rem);
}

.pricing-badge {
  align-self: flex-start;
  margin-bottom: 0.75rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--primary-color);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.pricing-grid .pricing-card:first-of-type .pricing-price {
  color: var(--ink-muted);
}


/* --- 9. CTA --- */
.cta-section {
  position: relative;
  display: grid;
  min-height: clamp(18rem, 35vw, 28rem);
  place-items: center;
  overflow: hidden;
  isolation: isolate;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
  padding: 0;
  background:
    linear-gradient(180deg, rgba(20, 21, 34, 0.42), rgba(20, 21, 34, 0.62)),
    linear-gradient(135deg, var(--primary-dark), var(--primary-color) 50%, var(--accent-color));
  color: #fff;
}

.cta-content {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  padding-block: clamp(4rem, 8vw, 6.5rem);
  text-align: center;
}

.cta-content h2 {
  max-width: 58rem;
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.cta-lead {
  max-width: 45rem;
  margin: 1rem 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.6;
  text-wrap: balance;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  justify-content: center;
  margin-top: clamp(1.35rem, 2.6vw, 1.8rem);
}

.cta-button {
  display: inline-flex;
  min-height: 3.1rem;
  align-items: center;
  justify-content: center;
  padding: 0 1.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: 0 1rem 2.5rem rgba(0, 0, 0, 0.18);
  transition: transform 0.16s ease, background 0.16s ease;
}

.cta-button:hover {
  background: #fff;
  transform: translateY(-1px);
}

.cta-button-outline {
  color: #fff;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.92);
}

.cta-button-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}


/* --- 10. FOOTER --- */
.site-footer {
  padding: 3rem 0 2rem;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.82);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.footer-grid .brand {
  color: #fff;
}

.footer-grid > .footer-panel:first-of-type p {
  margin-top: 0.85rem;
  max-width: 18rem;
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.92rem;
}

.footer-links h3 {
  margin-bottom: 0.85rem;
  color: #fff;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links a {
  display: block;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
}

.footer-links li + li {
  margin-top: 0.55rem;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.88rem;
}


/* --- 11. ACCESSIBILITÉ --- */
a:focus-visible,
input:focus-visible,
.testimonial-dots label:focus-visible {
  outline: 3px solid rgba(3, 159, 244, 0.55);
  outline-offset: 3px;
}


/* --- 12. RESPONSIVE --- */
@media (max-width: 960px) {
  .hero-grid,
  .testimonials-layout,
  .features-grid,
  .pricing-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .site-header > .container {
    flex-wrap: wrap;
    align-items: center;
    min-height: auto;
    padding-block: 0.65rem;
    row-gap: 0.65rem;
  }

  .main-nav {
    order: 3;
    display: flex;
    flex: 1 1 100%;
    gap: 0.85rem;
    overflow-x: auto;
    padding-bottom: 0.2rem;
    font-size: 0.84rem;
    white-space: nowrap;
    scrollbar-width: none;
  }

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

  .site-header .btn {
    min-height: 2.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }

  .hero-visual {
    margin-top: 0.5rem;
  }

  .testimonials-layout {
    gap: 1.75rem;
  }

  .testimonials-layout > div:first-child {
    text-align: center;
  }

  .testimonials-layout .section-lead {
    margin-inline: auto;
  }

  .testimonial-card {
    min-height: auto;
    padding: 1.15rem;
  }

  .avatar-photo {
    width: 2.85rem;
    height: 2.85rem;
  }

  .testimonial-dots {
    justify-content: center;
  }

  .pricing-card-featured {
    transform: none;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 3.85rem;
    --page-x: 1rem;
  }

  .hero {
    padding: 1.75rem 0 2.25rem;
  }

  .hero-copy h1 {
    font-size: clamp(1.7rem, 8.5vw, 2.15rem);
  }

  .hero-copy > p {
    font-size: 0.98rem;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
    margin-top: 1.5rem;
  }

  .hero-stats > li {
    min-width: 0;
  }

  .hero-stats strong {
    font-size: 1.2rem;
  }

  .hero-stats span {
    font-size: 0.78rem;
  }

  .section-title {
    font-size: clamp(1.45rem, 6.8vw, 1.85rem);
  }

  .section-lead {
    font-size: 0.95rem;
  }

  .features,
  .testimonials,
  .pricing {
    padding-block: 2.75rem;
  }

  .features-header,
  .pricing-header {
    margin-bottom: 1.75rem;
    text-align: center;
  }

  .features-header .section-lead,
  .pricing-header .section-lead {
    margin-inline: auto;
  }

  .feature-card {
    padding: 1.25rem;
  }

  .pricing-card {
    padding: 1.35rem;
  }

  .pricing-price {
    font-size: clamp(1.5rem, 7vw, 1.9rem);
  }

  .cta-section {
    min-height: auto;
    margin-bottom: 1.5rem;
  }

  .cta-content {
    padding-block: 2.5rem 2.75rem;
  }

  .cta-content h2 {
    font-size: clamp(1.45rem, 7.2vw, 1.9rem);
  }

  .hero-actions,
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .btn,
  .cta-button,
  .cta-button-outline {
    width: 100%;
  }

  .site-header .btn {
    width: auto;
  }

  .footer-grid {
    gap: 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: 1.5rem;
    font-size: 0.82rem;
  }
}

@media (max-width: 380px) {
  .brand {
    font-size: 0.95rem;
    gap: 0.45rem;
  }

  .brand-mark {
    width: 2.1rem;
    height: 2.1rem;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
  }

  .hero-stats > li:last-child {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}