:root {
  --night: #1b1b2f;
  --light: #edeade;
  --coral: #f85b5a;
  --font-title: "Playfair Display", Georgia, serif;
  --font-body: "Roboto", Arial, sans-serif;
  --header-height: 82px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  background: var(--night);
  color: var(--light);
  font-family: var(--font-body);
  line-height: 1.7;
}

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

button,
input,
textarea {
  font: inherit;
}

.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;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 18px clamp(20px, 4vw, 64px);
  background: var(--night);
  border-bottom: 1px solid var(--coral);
}

.brand {
  font-family: var(--font-title);
  font-size: clamp(1.55rem, 2vw, 2rem);
  font-weight: 700;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 2vw, 30px);
  font-size: 0.86rem;
}

.site-nav a,
.footer-links a {
  position: relative;
}

.site-nav a::after,
.footer-links a::after {
  position: absolute;
  content: "";
  left: 0;
  right: 0;
  bottom: -7px;
  height: 1px;
  background: var(--coral);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.footer-links a:hover::after,
.footer-links a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border: 1px solid var(--coral);
  color: var(--night);
  background: var(--coral);
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 220ms ease, background 220ms ease, color 220ms ease;
}

.header-cta:hover,
.btn:hover {
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--light);
}

.section-light .btn-secondary {
  color: var(--night);
}

.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.header-cta:focus-visible,
.nav-toggle:focus-visible,
.faq-question:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 4px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--coral);
  background: transparent;
  padding: 10px;
  cursor: pointer;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  height: 1px;
  width: 100%;
  background: var(--light);
  margin: 6px 0;
}

.section,
.hero {
  padding: clamp(86px, 11vw, 152px) clamp(20px, 5vw, 84px);
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + clamp(54px, 8vw, 96px));
}

.section-dark {
  background: var(--night);
  color: var(--light);
}

.section-light {
  background: var(--light);
  color: var(--night);
}

.hero-grid,
.split-layout,
.method-layout,
.faq-layout,
.contact-layout,
.references-layout {
  width: min(1160px, 100%);
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.75fr);
  gap: clamp(42px, 7vw, 90px);
  align-items: center;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--coral);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.section-light .eyebrow {
  color: var(--night);
  padding-left: 14px;
  border-left: 2px solid var(--coral);
}

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

h1,
h2,
h3 {
  font-family: var(--font-title);
  letter-spacing: 0;
  line-height: 1.02;
}

h1 {
  max-width: 850px;
  margin-bottom: 28px;
  font-size: clamp(3.5rem, 8vw, 7.8rem);
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(2.35rem, 5vw, 5.4rem);
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(1.35rem, 2vw, 1.75rem);
}

.hero-text,
.section-intro p,
.section-body p,
.contact-copy p {
  max-width: 680px;
  font-size: clamp(1.02rem, 1.4vw, 1.2rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.hero-visual {
  position: relative;
  min-height: 560px;
  border-left: 1px solid var(--coral);
}

.orb {
  position: absolute;
  width: clamp(180px, 24vw, 320px);
  aspect-ratio: 1;
  right: 0;
  top: 18px;
  border-radius: 50%;
  background: var(--coral);
}

.visual-card {
  position: absolute;
  width: min(78%, 320px);
  padding: 28px;
  border: 1px solid var(--coral);
  background: var(--night);
}

.visual-card span,
.card-index {
  display: block;
  margin-bottom: 28px;
  color: var(--night);
  font-size: 0.78rem;
  font-weight: 700;
}

.visual-card span,
.dark-card .card-index {
  color: var(--coral);
}

.visual-card strong {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-title);
  font-size: 1.7rem;
}

.visual-card p {
  margin-bottom: 0;
}

.visual-card-main {
  top: 150px;
  left: clamp(24px, 5vw, 62px);
}

.visual-card-side {
  right: 0;
  bottom: 46px;
}

.visual-line {
  position: absolute;
  background: var(--coral);
}

.visual-line-one {
  width: 1px;
  height: 150px;
  left: 18%;
  bottom: 0;
}

.visual-line-two {
  width: 46%;
  height: 1px;
  right: 10%;
  top: 54%;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: start;
}

.section-intro {
  width: min(920px, 100%);
  margin: 0 auto clamp(42px, 6vw, 78px);
}

.three-cards,
.expertise-grid,
.formation-grid {
  width: min(1160px, 100%);
  margin: clamp(42px, 6vw, 82px) auto 0;
  display: grid;
  gap: 18px;
}

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

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

.editorial-card,
.dark-card {
  min-height: 230px;
  padding: clamp(24px, 3vw, 38px);
  border: 1px solid var(--coral);
}

.editorial-card {
  background: var(--light);
}

.dark-card {
  background: var(--night);
}

.editorial-card p,
.dark-card p {
  margin-bottom: 0;
}

.method-layout,
.faq-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.2fr);
  gap: clamp(36px, 7vw, 100px);
}

.sticky-title {
  position: sticky;
  top: calc(var(--header-height) + 36px);
  align-self: start;
}

.steps {
  display: grid;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 28px;
  padding: 34px 0;
  border-top: 1px solid var(--coral);
}

.step:last-child {
  border-bottom: 1px solid var(--coral);
}

.step span {
  color: var(--coral);
  font-family: var(--font-title);
  font-size: 2.4rem;
  line-height: 1;
}

.step p {
  margin-bottom: 0;
}

.audience-grid,
.tag-cloud,
.reference-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.audience-grid span,
.tag-cloud span,
.reference-list span {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--coral);
}

.highlight-line {
  width: min(1160px, 100%);
  margin: 42px auto 0;
  padding: clamp(24px, 4vw, 42px);
  border-left: 4px solid var(--coral);
  font-family: var(--font-title);
  font-size: clamp(1.55rem, 3vw, 2.8rem);
  line-height: 1.15;
}

.references-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.75fr);
  gap: clamp(34px, 7vw, 90px);
}

.reference-feature {
  width: fit-content;
  margin: 28px 0 22px;
  padding: 14px 18px;
  border: 1px solid var(--coral);
  font-family: var(--font-title);
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  line-height: 1.2;
}

.reference-list {
  align-content: start;
}

.reference-list span {
  width: 100%;
}

.accordion {
  border-top: 1px solid var(--coral);
}

.faq-item {
  border-bottom: 1px solid var(--coral);
}

.faq-question {
  position: relative;
  width: 100%;
  padding: 28px 46px 28px 0;
  border: 0;
  background: transparent;
  color: var(--light);
  text-align: left;
  font-family: var(--font-title);
  font-size: clamp(1.25rem, 2vw, 1.8rem);
  line-height: 1.2;
  cursor: pointer;
}

.faq-question::after {
  position: absolute;
  content: "+";
  right: 0;
  top: 28px;
  color: var(--coral);
  font-family: var(--font-body);
  font-size: 2rem;
  line-height: 1;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 240ms ease;
}

.faq-answer > p {
  overflow: hidden;
  margin: 0;
}

.faq-item.is-open .faq-answer {
  grid-template-rows: 1fr;
  padding-bottom: 28px;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(300px, 1fr);
  gap: clamp(36px, 7vw, 96px);
}

.technical-note {
  margin-top: 32px;
  padding-left: 18px;
  border-left: 2px solid var(--coral);
  font-size: 0.95rem;
}

.contact-form {
  display: grid;
  gap: 12px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--coral);
}

.contact-form label {
  color: var(--night);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--coral);
  background: var(--light);
  color: var(--night);
  padding: 14px 16px;
  resize: vertical;
}

.contact-form .btn {
  margin-top: 12px;
  width: fit-content;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr) minmax(220px, 0.75fr);
  gap: 28px;
  align-items: start;
  padding: 44px clamp(20px, 5vw, 84px);
  background: var(--night);
  color: var(--light);
  border-top: 1px solid var(--coral);
}

.site-footer p {
  margin-bottom: 0;
}

.footer-links {
  display: grid;
  gap: 12px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 1060px) {
  .site-header {
    grid-template-columns: auto auto;
  }

  .nav-toggle {
    display: block;
    justify-self: end;
  }

  .site-nav,
  .header-cta {
    display: none;
  }

  .site-header.is-open .site-nav {
    display: grid;
    grid-column: 1 / -1;
    justify-content: stretch;
    gap: 0;
    padding-top: 14px;
  }

  .site-header.is-open .site-nav a {
    padding: 14px 0;
    border-top: 1px solid var(--coral);
  }

  .site-header.is-open .header-cta {
    display: inline-flex;
    grid-column: 1 / -1;
    justify-self: start;
  }

  .hero-grid,
  .split-layout,
  .method-layout,
  .faq-layout,
  .contact-layout,
  .references-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-visual {
    min-height: 460px;
  }

  .sticky-title {
    position: static;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 74px;
  }

  .section,
  .hero {
    padding-left: 18px;
    padding-right: 18px;
  }

  .three-cards,
  .expertise-grid,
  .formation-grid,
  .site-footer {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(3rem, 15vw, 4.4rem);
  }

  h2 {
    font-size: clamp(2.25rem, 11vw, 3.5rem);
  }

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

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

  .hero-visual {
    min-height: 410px;
    border-left: 0;
    border-top: 1px solid var(--coral);
  }

  .visual-card {
    width: min(88%, 310px);
    padding: 22px;
  }

  .visual-card-main {
    left: 0;
    top: 110px;
  }

  .visual-card-side {
    right: 0;
    bottom: 0;
  }

  .step {
    grid-template-columns: 46px 1fr;
    gap: 18px;
  }

  .contact-form .btn {
    width: 100%;
  }
}

@media (max-width: 430px) {
  .site-header {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-visual {
    min-height: 470px;
  }
}