/* =========================================================
   B-OPEN SRL — Site one-page
   Style: minimaliste "maison d'architecte"
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  /* Palette */
  --bg: #fafaf9;
  --bg-alt: #f4f4f2;
  --bg-dark: #3a4551;
  --bg-dark-alt: #2f383d;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-on-dark: #f8fafc;
  --border: #e2e8f0;
  --border-dark: #4a5560;
  --nav-bg: #2f383d;           /* Couleur de fond du logo — cohérence visuelle */
  --nav-border: #4a5560;       /* Filet de séparation sous la nav, ton sur ton */
  --accent: #7a8fa6;
  --accent-hover: #5f7389;

  /* Typographie */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Échelle typographique (maison d'architecte = type aéré) */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 2rem;
  --fs-4xl: 2.75rem;
  --fs-5xl: 4rem;
  --fs-hero: 5.5rem;

  /* Espacement */
  --section-y: 9rem;
  --container-max: 1240px;
  --container-pad: 2rem;

  /* Divers */
  --radius: 2px;
  --transition: 280ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-border: 2000ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, object { display: block; max-width: 100%; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }

/* Lien subtil inline dans le contenu (souligné fin, réagit au hover) */
.link-inline {
  color: inherit;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: color var(--transition), border-color var(--transition);
}
.link-inline:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; font-size: inherit; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  background: var(--nav-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), padding var(--transition);
}
.nav.scrolled {
  padding: 0.75rem 0;
  border-bottom-color: var(--nav-border);
}
.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo img {
  width: 95px;
  transition: opacity var(--transition);
}
.nav-logo:hover img { opacity: 0.75; }

.nav-links {
  display: flex;
  gap: 2.25rem;
  align-items: center;
}
.nav-links-logo { display: none; }
.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 400;
  color: var(--text-light);
  letter-spacing: 0.01em;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0;
  height: 1px;
  background: var(--text-on-dark);
  transition: width var(--transition);
}
.nav-links a:hover { color: var(--text-on-dark); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  padding: 0.55rem 1.25rem;
  border: 1px solid var(--text-light);
  color: var(--text-on-dark) !important;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.nav-cta::after { display: none; }
.nav-cta:hover {
  background: var(--text-on-dark);
  border-color: var(--text-on-dark);
  color: var(--nav-bg) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  height: 1px;
  background: var(--text-on-dark);
  transition: transform var(--transition), opacity var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 4rem;
  position: relative;
  background:
    linear-gradient(to bottom, var(--bg), var(--bg)),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='60' height='60'><circle cx='1' cy='1' r='1' fill='%23cbd5e1'/></svg>");
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  width: 1px; height: 60%;
  background: linear-gradient(to bottom, transparent, var(--border), transparent);
  opacity: 0.5;
}
.hero-inner {
  width: 100%;
  position: relative;
  z-index: 1;
}
.hero-label {
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  margin-bottom: 3rem;
  padding-left: 3.5rem;
  position: relative;
}
.hero-label::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  width: 2.5rem;
  height: 1px;
  background: var(--text-muted);
}
.hero-title {
  font-size: clamp(2.5rem, 8vw, var(--fs-hero));
  font-weight: 200;
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin-bottom: 2.5rem;
}
.hero-title em {
  font-style: italic;
  font-weight: 300;
}
.hero-subtitle {
  font-size: clamp(var(--fs-lg), 2vw, var(--fs-xl));
  font-weight: 300;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 3.5rem;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}
.hero-scroll {
  position: absolute;
  bottom: -2rem;
  right: var(--container-pad);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
}
.hero-scroll-line {
  width: 1px;
  height: 3rem;
  background: var(--text-muted);
  animation: scrollPulse 2.5s ease-in-out infinite;
  transform-origin: top;
}
@keyframes scrollPulse {
  0%, 100% { transform: scaleY(0.3); opacity: 0.3; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.95rem 1.75rem;
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--nav-bg);
  color: var(--text-on-dark);
}
.btn-primary:hover {
  background: var(--accent);
  color: #fff;
}
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--text);
  background: var(--bg-alt);
}

/* ---------- Sections génériques ---------- */
.section {
  padding: var(--section-y) 0;
  position: relative;
}
.section + .section {
  border-top: 1px solid var(--border);
}
.section-header {
  margin-bottom: 5rem;
  max-width: 780px;
}
.section-label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.section-label.light { color: var(--text-light); }
.section-title {
  font-size: clamp(2rem, 5vw, var(--fs-4xl));
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text);
}
.section-title.light { color: var(--text-on-dark); }
.section-intro {
  font-size: var(--fs-lg);
  color: var(--text-muted);
  margin-top: 1.5rem;
  max-width: 620px;
}

/* ---------- À propos ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 5rem;
  align-items: start;
}
.about-photo {
  position: sticky;
  top: 7rem;
}
.photo-frame {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.photo-frame img {
  width: 80%;
  height: auto;
  opacity: 0.85;
}
.photo-caption {
  margin-top: 1.25rem;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text);
}
.photo-caption span {
  display: block;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.15rem;
}
.about-text .lead {
  font-size: var(--fs-xl);
  font-weight: 300;
  line-height: 1.55;
  color: var(--text);
  margin-bottom: 1.75rem;
}
.about-text p {
  font-size: var(--fs-base);
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  max-width: 620px;
}
.about-text strong {
  color: var(--text);
  font-weight: 500;
}
.about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem 3rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.about-facts li {
  font-size: var(--fs-sm);
  color: var(--text-muted);
}
.about-facts strong {
  display: block;
  font-size: var(--fs-xl);
  font-weight: 300;
  color: var(--text);
  margin-bottom: 0.25rem;
}

/* ---------- Expertises ---------- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.expertise-card {
  padding: 3rem 2.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  transition: border-color var(--transition-border);
  cursor: default;
  -webkit-user-select: none;
  user-select: none;
}
.expertise-card:hover {
  border-color: var(--accent);
}
.expertise-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 2rem;
  opacity: 0.85;
  position: relative;
  left: 0;
  /* Retour au repos : rapide, avec accélération/décélération douces */
  transition: left 650ms cubic-bezier(0.32, 0, 0.16, 1);
}
.expertise-card:hover .expertise-icon {
  left: calc(100% - 56px - 8px);
  /* Voyage sous le hover : 2,5 s avec accélération douce puis décélération */
  transition: left 2500ms cubic-bezier(0.32, 0, 0.32, 1);
}
.expertise-card h3 {
  font-size: var(--fs-xl);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}
.expertise-card p {
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- Compétences ---------- */
.competences {
  background: var(--bg-alt);
}
.competences-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.competence-block {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2.75rem 2.5rem;
  transition: border-color var(--transition-border);
  cursor: default;
  -webkit-user-select: none;
  user-select: none;
}
.competence-block:hover {
  border-color: var(--accent);
}
.competence-block:first-child {
  grid-column: 1 / -1;
}
.competence-title {
  font-size: var(--fs-lg);
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-bottom: 1.25rem;
  position: relative;
  padding-left: 1.5rem;
}
.competence-title::before {
  content: '';
  position: absolute;
  left: 0; top: 0.7em;
  width: 0.75rem;
  height: 1px;
  background: var(--accent);
}
.competence-desc {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}
.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tech-list li {
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  transition: all var(--transition);
}
.tech-list li:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Projets ---------- */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 7rem;
}
.project {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.project-reverse .project-media { order: 2; }
.project-media {
  aspect-ratio: 4 / 3;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-border);
  cursor: default;
}
.project-media:hover {
  border-color: var(--accent);
}
.project-media object {
  width: 100%;
  height: 100%;
  pointer-events: none;
  transition: transform 900ms cubic-bezier(0.22, 1, 0.36, 1);
}
.project-media:hover object {
  transform: scale(1.035);
}
.project-sector {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.project-content h3 {
  font-size: clamp(1.5rem, 3vw, var(--fs-3xl));
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.75rem;
}
.project-content p {
  font-size: var(--fs-base);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
}
.project-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.project-facts li {
  font-size: var(--fs-sm);
  color: var(--text-muted);
}
.project-facts strong {
  color: var(--text);
  font-weight: 500;
}

/* ---------- Méthodologie ---------- */
.methode {
  background: var(--bg-alt);
}
.method-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.method-item {
  padding: 3rem 2.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  transition: border-color var(--transition-border);
  cursor: default;
  -webkit-user-select: none;
  user-select: none;
}
.method-item:hover {
  border-color: var(--accent);
}
.method-num {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.method-item h3 {
  font-size: var(--fs-xl);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}
.method-item p {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---------- Contact ---------- */
.contact {
  background: var(--bg-dark);
  color: var(--text-on-dark);
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.contact-text .section-title {
  margin-bottom: 2rem;
}
.contact-lead {
  font-size: var(--fs-lg);
  line-height: 1.65;
  color: var(--text-light);
  margin-bottom: 2.5rem;
  max-width: 480px;
}
.contact-lead strong {
  color: var(--text-on-dark);
  font-weight: 500;
}
.contact-direct {
  padding-top: 2rem;
  border-top: 1px solid var(--border-dark);
}
.contact-direct p {
  font-size: var(--fs-sm);
  color: var(--text-light);
  margin-bottom: 0.5rem;
}
.contact-email {
  font-size: var(--fs-xl);
  font-weight: 300;
  color: var(--text-on-dark);
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 0.25rem;
  transition: border-color var(--transition);
}
.contact-email:hover {
  border-bottom-color: var(--text-on-dark);
}

.contact-form {
  background: transparent;
}
.form-row {
  margin-bottom: 1.75rem;
}
.form-row label {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 0.6rem;
}
.form-row label span {
  text-transform: none;
  font-weight: 400;
  letter-spacing: 0.02em;
  opacity: 0.7;
}
.form-row input,
.form-row textarea {
  width: 100%;
  padding: 0.9rem 0;
  font-size: var(--fs-base);
  color: var(--text-on-dark);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-dark);
  outline: none;
  transition: border-color var(--transition);
  resize: vertical;
}
.form-row input:focus,
.form-row textarea:focus {
  border-bottom-color: var(--text-on-dark);
}
.form-row textarea {
  min-height: 100px;
}
.form-submit {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}
.form-submit .btn-primary {
  background: var(--text-on-dark);
  color: var(--bg-dark);
}
.form-submit .btn-primary:hover {
  background: var(--accent);
  color: var(--text-on-dark);
}
.form-rgpd {
  font-size: var(--fs-xs);
  color: var(--text-light);
  line-height: 1.5;
  flex: 1;
  min-width: 200px;
}
.form-feedback {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  font-size: var(--fs-sm);
  border-left: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.03);
  display: none;
}
.form-feedback.active { display: block; }
.form-feedback.success { border-color: #86efac; }
.form-feedback.error { border-color: #fca5a5; }

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-dark-alt);
  color: var(--text-light);
  padding: 4rem 0 3rem;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.footer-brand img {
  width: 90px;
  margin-bottom: 1rem;
}
.footer-brand p {
  font-size: var(--fs-sm);
  color: var(--text-light);
}
.footer-meta,
.footer-legal {
  font-size: var(--fs-sm);
}
.footer-meta p,
.footer-legal p {
  margin-bottom: 0.4rem;
}
.footer a:hover { color: var(--text-on-dark); }

/* ---------- Animations "reveal" à l'apparition ---------- */
/*
 * On utilise ici `animation` + la propriété individuelle `translate` (et non
 * `transform`) pour éviter que ces règles n'écrasent les `transition` déclarées
 * sur les éléments qui ont aussi des effets au survol (.expertise-card, etc.).
 * - animation/transition agissent sur des mécanismes CSS distincts, pas de conflit
 * - translate est une propriété à part, le transform du hover n'est pas impacté
 */
.reveal {
  opacity: 0;
  translate: 0 24px;
}
.reveal.visible {
  animation: reveal 800ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
@keyframes reveal {
  from { opacity: 0; translate: 0 24px; }
  to   { opacity: 1; translate: 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; translate: 0 0; }
  .reveal.visible { animation: none; }
  .hero-scroll-line { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --section-y: 6rem;
  }
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 280px 1fr; gap: 3rem; }
  .contact-inner { gap: 3rem; }
}

@media (max-width: 768px) {
  :root {
    --section-y: 5rem;
    --container-pad: 1.25rem;
  }

  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: 0;
    width: 100%;
    height: 100vh;
    background: var(--nav-bg);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform var(--transition);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: var(--fs-lg); }
  .nav-links-logo {
    display: flex;
    justify-content: center;
    width: 80%;
    padding-bottom: 2rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--nav-border);
  }
  .nav-links-logo img {
    width: 150px;
    height: auto;
  }

  .hero { padding-top: 6rem; }
  .hero-scroll { display: none; }
  .hero-cta { flex-direction: column; align-items: stretch; width: 100%; }
  .hero-cta .btn { justify-content: center; }

  .section-header { margin-bottom: 3rem; }

  .about-grid,
  .expertise-grid,
  .competences-grid,
  .method-grid,
  .project,
  .project-reverse,
  .contact-inner,
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .project-reverse .project-media { order: 0; }

  .about-photo { position: static; max-width: 280px; }

  .expertise-card,
  .method-item,
  .competence-block {
    padding: 2rem 1.5rem;
  }
}