/* ---------------------------------------------------
   Julien de Sousa · IA & Automatisations
   Design system : navy + indigo, Fraunces + Inter
--------------------------------------------------- */

:root {
  --navy-950: #12172b;
  --navy-900: #1b2340;
  --navy-800: #232c4d;
  --navy-700: #2a3560;
  --navy-600: #33446e;
  --navy-500: #4a5686;
  --ink: #1b2340;
  --muted: #5b6178;
  --muted-light: #8890a8;
  --indigo: #6366f1;
  --indigo-light: #a5a9f7;
  --indigo-dark: #4649c7;
  --paper: #ffffff;
  --mist: #f4f5fb;
  --mist-line: #e4e6f2;
  --line-on-dark: rgba(255, 255, 255, 0.14);
  --shadow: 0 20px 50px -25px rgba(27, 35, 64, 0.35);
  --radius: 18px;
  --radius-sm: 12px;
  --container: 1140px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
}

em {
  font-style: italic;
  color: var(--indigo);
}

p {
  margin: 0;
}

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

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

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--indigo);
  margin-bottom: 18px;
}

.eyebrow.on-dark {
  color: var(--indigo-light);
}

section {
  padding: 110px 0;
}

@media (max-width: 720px) {
  section {
    padding: 72px 0;
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--indigo);
  color: #fff;
  box-shadow: 0 14px 30px -12px rgba(99, 102, 241, 0.55);
}

.btn-primary:hover {
  background: var(--indigo-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--navy-900);
  border-color: var(--mist-line);
}

.btn-ghost:hover {
  border-color: var(--indigo);
  color: var(--indigo);
}

.btn-ghost.on-dark {
  color: #fff;
  border-color: var(--line-on-dark);
}

.btn-ghost.on-dark:hover {
  border-color: var(--indigo-light);
  color: var(--indigo-light);
}

.btn-sm {
  padding: 10px 18px;
  font-size: 0.85rem;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--mist-line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100px;
}

.logo img {
  height: 68px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--navy-900);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--indigo);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--navy-900);
  border-radius: 2px;
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    inset: 100px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--mist-line);
    padding: 8px 24px 20px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
  }

  .nav-links.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links a {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--mist-line);
  }

  .header-actions .btn-primary {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

/* ---------- Hero ---------- */

.hero {
  padding: 110px 0 90px;
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(99, 102, 241, 0.14), transparent 60%),
    var(--paper);
}

.hero .container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.4rem, 4.4vw, 3.6rem);
  color: var(--navy-950);
}

.hero-lede {
  margin-top: 26px;
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 46ch;
}

.hero-actions {
  margin-top: 38px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-card {
  background: var(--navy-900);
  border-radius: var(--radius);
  padding: 38px;
  color: #fff;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  width: 260px;
  height: 260px;
  right: -90px;
  top: -90px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.35), transparent 70%);
}

.hero-card .tag {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--indigo-light);
  font-weight: 600;
}

.hero-card ul {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-card li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.95rem;
  color: #dfe1f5;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-on-dark);
}

.hero-card li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.hero-card li .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--indigo);
  margin-top: 6px;
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
  }
}

/* ---------- Section heads ---------- */

.section-head {
  max-width: 640px;
  margin-bottom: 56px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head h2 {
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  color: var(--navy-950);
}

.section-head p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 1.05rem;
}

/* ---------- Problème ---------- */

.problem {
  background: var(--mist);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.problem-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.problem-list li {
  background: #fff;
  border: 1px solid var(--mist-line);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  font-size: 1rem;
  color: var(--navy-900);
  display: flex;
  align-items: center;
  gap: 14px;
}

.problem-list .num {
  font-family: "Fraunces", serif;
  color: var(--indigo);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.problem-flip {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 1.4rem;
  color: var(--muted-light);
  margin: 30px 0 6px;
}

.problem-flip svg {
  flex-shrink: 0;
}

@media (max-width: 860px) {
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* ---------- Services ---------- */

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: #fff;
  border: 1px solid var(--mist-line);
  border-radius: var(--radius);
  padding: 34px 30px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

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

.service-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(99, 102, 241, 0.1);
  color: var(--indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.service-card h3 {
  font-size: 1.2rem;
  color: var(--navy-950);
}

.service-card p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.96rem;
}

@media (max-width: 900px) {
  .services-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Processus ---------- */

.process {
  background: var(--navy-950);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.process::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(700px 400px at 10% 110%, rgba(99, 102, 241, 0.18), transparent 60%);
}

.process .container {
  position: relative;
}

.process .section-head h2,
.process .section-head p {
  color: #fff;
}

.process .section-head p {
  color: #c3c6e0;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-step {
  position: relative;
  padding: 30px 26px;
  border: 1px solid var(--line-on-dark);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
}

.process-step .step-num {
  font-family: "Fraunces", serif;
  font-size: 3.4rem;
  color: rgba(255, 255, 255, 0.1);
  position: absolute;
  top: 8px;
  right: 20px;
  line-height: 1;
}

.process-step h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  position: relative;
}

.process-step p {
  color: #b7bad8;
  font-size: 0.92rem;
  position: relative;
}

@media (max-width: 900px) {
  .process-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .process-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Réalisations ---------- */

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  border-radius: var(--radius);
  border: 1px solid var(--mist-line);
  overflow: hidden;
  background: #fff;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  display: flex;
  flex-direction: column;
}

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

.case-card-top {
  background: var(--navy-900);
  color: #fff;
  padding: 30px 26px;
  min-height: 168px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.case-tag {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--indigo-light);
  font-weight: 600;
}

.case-card-top h3 {
  font-size: 1.35rem;
  margin-top: 14px;
  color: #fff;
}

.case-card-body {
  padding: 24px 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1;
}

.case-card-body p {
  color: var(--muted);
  font-size: 0.95rem;
}

.case-stats {
  display: flex;
  gap: 22px;
  margin-top: auto;
}

.case-stats b {
  display: block;
  font-family: "Fraunces", serif;
  font-size: 1.15rem;
  color: var(--navy-950);
}

.case-stats span {
  font-size: 0.78rem;
  color: var(--muted-light);
}

.case-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--indigo);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.case-card.is-live:hover .case-link {
  gap: 10px;
}

.case-link svg {
  transition: transform 0.15s ease;
}

.case-card.is-soon {
  opacity: 0.6;
}

.case-card.is-soon .case-card-top {
  background: var(--mist);
  color: var(--navy-900);
}

.case-card.is-soon .case-tag {
  color: var(--indigo);
}

.case-card.is-soon .case-card-top h3 {
  color: var(--navy-900);
}

.case-card.is-soon .case-link {
  color: var(--muted-light);
}

@media (max-width: 900px) {
  .cases-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- About ---------- */

.about .container {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: center;
}

.about-portrait {
  aspect-ratio: 4/5;
  border-radius: var(--radius);
  background: linear-gradient(155deg, var(--navy-800), var(--navy-950));
  overflow: hidden;
}

.about-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-list {
  margin-top: 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-list li {
  display: flex;
  gap: 12px;
  color: var(--navy-900);
  font-size: 0.98rem;
}

.about-list b {
  color: var(--indigo);
}

@media (max-width: 860px) {
  .about .container {
    grid-template-columns: 1fr;
  }

  .about-portrait {
    max-width: 280px;
    margin: 0 auto;
  }
}

/* ---------- Contact / CTA ---------- */

.cta {
  background: var(--indigo);
  color: #fff;
}

.cta .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.cta h2 {
  color: #fff;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  max-width: 20ch;
}

.cta p {
  margin-top: 14px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 42ch;
}

.cta .btn-primary {
  background: #fff;
  color: var(--indigo-dark);
  box-shadow: none;
}

.cta .btn-primary:hover {
  background: var(--navy-950);
  color: #fff;
}

.cta .btn-ghost {
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.cta .btn-ghost:hover {
  border-color: #fff;
}

.cta-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--navy-950);
  color: #b7bad8;
  padding: 60px 0 30px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-on-dark);
}

.footer-logo img {
  height: 68px;
  margin-bottom: 16px;
}

.footer-top p {
  max-width: 34ch;
  font-size: 0.92rem;
}

.footer-links {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-links h4 {
  font-family: "Inter", sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 16px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.92rem;
  color: #b7bad8;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--indigo-light);
}

.footer-bottom {
  padding-top: 26px;
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: #7d81a3;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* =====================================================
   Case study page (cas/*.html)
===================================================== */

.case-hero {
  background: var(--navy-950);
  color: #fff;
  padding: 150px 0 100px;
  position: relative;
  overflow: hidden;
}

.case-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(800px 420px at 90% 0%, rgba(99, 102, 241, 0.22), transparent 60%);
}

.case-hero .container {
  position: relative;
}

.case-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: #b7bad8;
  margin-bottom: 30px;
}

.case-breadcrumb:hover {
  color: var(--indigo-light);
}

.case-hero h1 {
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  max-width: 16ch;
  color: #fff;
}

.case-hero .hero-lede {
  color: #c3c6e0;
  font-size: 1.2rem;
}

.case-problem {
  background: var(--mist);
}

.case-problem .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

@media (max-width: 860px) {
  .case-problem .container {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

.case-steps .section-head {
  margin-bottom: 60px;
}

.case-steps-list {
  display: flex;
  flex-direction: column;
}

.case-step {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 30px;
  padding: 34px 0;
  border-bottom: 1px solid var(--mist-line);
  align-items: start;
}

.case-step:first-child {
  padding-top: 0;
}

.case-step:last-child {
  border-bottom: none;
}

.case-step .step-num {
  font-family: "Fraunces", serif;
  font-size: 3.2rem;
  color: var(--mist-line);
  line-height: 1;
}

.case-step .step-tag {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--indigo);
  font-weight: 600;
  margin-bottom: 8px;
  display: block;
}

.case-step h3 {
  font-size: 1.35rem;
  color: var(--navy-950);
}

.case-step p {
  margin-top: 10px;
  color: var(--muted);
  max-width: 60ch;
}

.case-results {
  background: var(--navy-950);
  color: #fff;
}

.case-results .section-head h2,
.case-results .section-head p {
  color: #fff;
}

.case-results .section-head p {
  color: #c3c6e0;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.result-card {
  border: 1px solid var(--line-on-dark);
  border-radius: var(--radius);
  padding: 34px 28px;
  text-align: center;
}

.result-card b {
  display: block;
  font-family: "Fraunces", serif;
  font-size: 2.1rem;
  margin-bottom: 10px;
}

.result-card span {
  color: #b7bad8;
  font-size: 0.92rem;
}

.result-note {
  margin-top: 40px;
  text-align: center;
  color: #c3c6e0;
  font-size: 1.05rem;
}

@media (max-width: 860px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
}

.case-cta {
  padding: 100px 0;
  text-align: center;
}

.case-cta h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  max-width: 20ch;
  margin: 0 auto;
}

.case-cta p {
  margin: 18px auto 34px;
  color: var(--muted);
  max-width: 46ch;
}