/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:      #1a3a8f;
  --blue-light:#2550c0;
  --dark:      #0d1117;
  --dark2:     #161b22;
  --dark3:     #1c2333;
  --accent:    #3b82f6;
  --gold:      #f59e0b;
  --white:     #ffffff;
  --gray:      #94a3b8;
  --gray-light:#e2e8f0;
  --radius:    12px;
  --shadow:    0 4px 32px rgba(0,0,0,.35);
  --transition: .3s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--dark);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark2); }
::-webkit-scrollbar-thumb { background: var(--blue); border-radius: 3px; }

/* ===== UTILITY ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-title {
  text-align: center;
  margin-bottom: 64px;
}
.section-title h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -.02em;
}
.section-title h2 span { color: var(--accent); }
.section-title p {
  color: var(--gray);
  font-size: 1.1rem;
  margin-top: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.divider {
  width: 60px; height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
  border-radius: 2px;
  margin: 16px auto 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--accent));
  color: var(--white);
  box-shadow: 0 4px 20px rgba(59,130,246,.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(59,130,246,.5); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: var(--white); transform: translateY(-2px); }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  background: rgba(13,17,23,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(13,17,23,.97);
  box-shadow: 0 2px 20px rgba(0,0,0,.4);
}
.nav-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.3rem;
  font-weight: 800;
}
/* --- Navbar logo pill : fond blanc doux pour rendre le logo lisible sur fond sombre --- */
.logo-pill {
  background: rgba(255,255,255,.93);
  border-radius: 12px;
  padding: 5px 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(59,130,246,.35), 0 0 0 1px rgba(59,130,246,.2);
  transition: var(--transition);
}
.nav-logo:hover .logo-pill {
  box-shadow: 0 4px 20px rgba(59,130,246,.55), 0 0 0 2px rgba(59,130,246,.35);
  transform: scale(1.05);
}
.logo-img {
  width: 54px;
  height: 54px;
  object-fit: contain;
  display: block;
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-links a {
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 500;
  color: var(--gray);
  transition: var(--transition);
  font-size: .95rem;
}
.nav-links a:hover, .nav-links a.active { color: var(--white); background: rgba(59,130,246,.12); }
.nav-cta {
  background: linear-gradient(135deg, var(--blue), var(--accent));
  color: var(--white) !important;
  padding: 10px 22px !important;
  border-radius: 50px !important;
}
.nav-cta:hover { opacity: .9; background: rgba(0,0,0,0) !important; box-shadow: 0 4px 16px rgba(59,130,246,.4); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: var(--transition);
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 100px 24px 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(26,58,143,.35) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(59,130,246,.12) 0%, transparent 60%),
    var(--dark);
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,.04) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(59,130,246,.1);
  border: 1px solid rgba(59,130,246,.3);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: .85rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-badge::before { content: ''; width: 8px; height: 8px; background: var(--accent); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }
.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.03em;
  margin-bottom: 24px;
}
.hero-title span {
  background: linear-gradient(135deg, var(--accent), #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  color: var(--gray);
  font-size: 1.15rem;
  margin-bottom: 40px;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 56px; }
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-number {
  font-size: 2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.stat-label { color: var(--gray); font-size: .85rem; }
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-card-stack {
  position: relative;
  width: 400px;
  height: 400px;
}
.hero-logo-center {
  position: absolute;
  inset: 50%;
  transform: translate(-50%, -50%);
  width: 190px;
  height: 190px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Anneau bleu pulsant */
  border: 2.5px solid rgba(59,130,246,.55);
  box-shadow:
    0 0 0 6px rgba(59,130,246,.08),
    0 0 40px rgba(59,130,246,.35),
    0 0 80px rgba(59,130,246,.15);
  background: radial-gradient(circle, rgba(255,255,255,.96) 52%, rgba(220,232,255,.7) 72%, rgba(28,42,74,.9) 100%);
  z-index: 2;
  animation: hero-ring-pulse 3s ease-in-out infinite;
}
@keyframes hero-ring-pulse {
  0%,100% { box-shadow: 0 0 0 6px rgba(59,130,246,.08), 0 0 40px rgba(59,130,246,.35), 0 0 80px rgba(59,130,246,.15); }
  50%      { box-shadow: 0 0 0 10px rgba(59,130,246,.14), 0 0 55px rgba(59,130,246,.55), 0 0 100px rgba(59,130,246,.22); }
}

/* Fond blanc doux pour que le logo (couleurs sombres) soit parfaitement lisible */
.hero-logo-bg {
  width: 148px;
  height: 148px;
  border-radius: 50%;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(26,58,143,.18);
}
.hero-logo-img {
  width: 128px;
  height: 128px;
  object-fit: contain;
  display: block;
}
.orbit {
  position: absolute;
  border: 1px solid rgba(59,130,246,.15);
  border-radius: 50%;
  animation: rotate linear infinite;
}
.orbit-1 { width: 260px; height: 260px; top: 70px; left: 70px; animation-duration: 12s; }
.orbit-2 { width: 360px; height: 360px; top: 20px; left: 20px; animation-duration: 20s; animation-direction: reverse; }
@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.orbit-dot {
  position: absolute;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  top: -6px; left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 12px var(--accent);
}
.service-mini-card {
  position: absolute;
  background: var(--dark2);
  border: 1px solid rgba(59,130,246,.2);
  border-radius: var(--radius);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .85rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow);
  animation: float 3s ease-in-out infinite;
}
.service-mini-card .icon { font-size: 1.3rem; }
.card-top    { top: 0; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.card-right  { right: -20px; top: 50%; transform: translateY(-50%); animation-delay: .75s; }
.card-bottom { bottom: 0; left: 50%; transform: translateX(-50%); animation-delay: 1.5s; }
.card-left   { left: -20px; top: 50%; transform: translateY(-50%); animation-delay: 2.25s; }
@keyframes float { 0%,100%{margin-top:0} 50%{margin-top:-8px} }

/* ===== SERVICES ===== */
.services { padding: 100px 0; background: var(--dark2); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}
.service-card {
  background: var(--dark3);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  cursor: default;
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}
.service-card:hover { border-color: rgba(59,130,246,.3); transform: translateY(-6px); box-shadow: 0 20px 40px rgba(0,0,0,.3); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, rgba(26,58,143,.4), rgba(59,130,246,.2));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
  border: 1px solid rgba(59,130,246,.2);
}
.service-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.service-card p { color: var(--gray); font-size: .95rem; line-height: 1.65; margin-bottom: 20px; }
.service-features { display: flex; flex-direction: column; gap: 8px; }
.service-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--gray);
  font-size: .88rem;
}
.service-features li::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ===== ABOUT ===== */
.about { padding: 100px 0; }
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-img-wrap { position: relative; }
.about-img-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-img-item {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1;
  background: var(--dark2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  border: 1px solid rgba(255,255,255,.06);
}
.about-img-item.big { grid-row: span 2; aspect-ratio: auto; }
.about-badge-float {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: center;
  box-shadow: var(--shadow);
}
.about-badge-float .number { font-size: 2rem; font-weight: 900; display: block; }
.about-badge-float .label { font-size: .8rem; opacity: .85; }
.about-content { }
.about-content .section-title { text-align: left; margin-bottom: 32px; }
.about-content .section-title .divider { margin-left: 0; }
.about-content p { color: var(--gray); font-size: 1rem; line-height: 1.75; margin-bottom: 20px; }
.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}
.value-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--dark2);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.06);
}
.value-icon { font-size: 1.4rem; flex-shrink: 0; }
.value-item h4 { font-size: .95rem; font-weight: 700; margin-bottom: 4px; }
.value-item p { color: var(--gray); font-size: .82rem; margin: 0; }
.about-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 32px;
}
.info-item {
  display: flex;
  flex-direction: column;
}
.info-item .label { color: var(--gray); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 4px; }
.info-item .value { font-weight: 600; font-size: .95rem; color: var(--accent); }

/* ===== PROJECTS ===== */
.projects { padding: 100px 0; background: var(--dark2); }
.projects-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.filter-btn {
  padding: 10px 24px;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,.1);
  background: transparent;
  color: var(--gray);
  cursor: pointer;
  font-size: .9rem;
  font-weight: 500;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}
.project-card {
  background: var(--dark3);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.project-card:hover { transform: translateY(-6px); box-shadow: 0 20px 50px rgba(0,0,0,.4); border-color: rgba(59,130,246,.2); }
.project-img {
  height: 200px;
  background: linear-gradient(135deg, var(--dark), var(--dark3));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}
.project-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, var(--dark3));
}
.project-tag {
  position: absolute;
  top: 16px; left: 16px;
  background: var(--accent);
  color: var(--white);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: .78rem;
  font-weight: 600;
  z-index: 1;
}
.project-body { padding: 24px; }
.project-body h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.project-body p { color: var(--gray); font-size: .9rem; line-height: 1.6; }

/* ===== TESTIMONIALS ===== */
.testimonials { padding: 100px 0; }
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.testimonial-card {
  background: var(--dark2);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}
.testimonial-card:hover { border-color: rgba(59,130,246,.2); transform: translateY(-4px); }
.stars { color: var(--gold); font-size: 1.1rem; margin-bottom: 16px; letter-spacing: 2px; }
.testimonial-card p { color: var(--gray); font-size: .95rem; line-height: 1.7; margin-bottom: 24px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 14px; }
.author-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.author-name { font-weight: 700; font-size: .95rem; }
.author-role { color: var(--gray); font-size: .82rem; }

/* ===== CONTACT ===== */
.contact { padding: 100px 0; background: var(--dark2); }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}
.contact-info h3 { font-size: 1.6rem; font-weight: 800; margin-bottom: 16px; }
.contact-info > p { color: var(--gray); margin-bottom: 40px; line-height: 1.7; }
.contact-items { display: flex; flex-direction: column; gap: 20px; margin-bottom: 40px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-item-icon {
  width: 48px; height: 48px;
  background: rgba(59,130,246,.1);
  border: 1px solid rgba(59,130,246,.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.contact-item-text .label { color: var(--gray); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 4px; }
.contact-item-text .value { font-weight: 600; font-size: 1rem; }
.contact-item-text a { color: var(--white); transition: var(--transition); }
.contact-item-text a:hover { color: var(--accent); }
.social-links { display: flex; gap: 12px; }
.social-link {
  width: 44px; height: 44px;
  background: var(--dark3);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}
.social-link:hover { background: var(--accent); border-color: var(--accent); transform: translateY(-3px); }
.contact-form-wrap {
  background: var(--dark3);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 20px;
  padding: 48px;
}
.contact-form-wrap h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.contact-form-wrap > p { color: var(--gray); margin-bottom: 32px; font-size: .95rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  color: var(--gray-light);
  margin-bottom: 8px;
}
.form-group label span { color: var(--accent); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--dark2);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--white);
  font-size: .95rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
  appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: rgba(148,163,184,.5); }
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group select option { background: var(--dark2); }
.form-submit { margin-top: 8px; width: 100%; justify-content: center; padding: 16px; font-size: 1rem; }
.form-message {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: 10px;
  font-size: .9rem;
  display: none;
}
.form-message.success { background: rgba(34,197,94,.1); border: 1px solid rgba(34,197,94,.3); color: #4ade80; }
.form-message.error   { background: rgba(239,68,68,.1);  border: 1px solid rgba(239,68,68,.3);  color: #f87171; }

/* ===== FOOTER ===== */
.footer {
  background: var(--dark);
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .nav-logo { margin-bottom: 20px; }
.footer-logo-pill {
  background: rgba(255,255,255,.92);
  border-radius: 14px;
  padding: 8px 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 16px rgba(59,130,246,.3), 0 0 0 1px rgba(59,130,246,.18);
}
.footer-logo-img {
  width: 68px;
  height: 68px;
  object-fit: contain;
  display: block;
}
.footer-brand p { color: var(--gray); font-size: .9rem; line-height: 1.7; margin-bottom: 24px; }
.footer-col h4 { font-size: 1rem; font-weight: 700; margin-bottom: 20px; color: var(--white); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: var(--gray); font-size: .9rem; transition: var(--transition); }
.footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
.footer-col .contact-mini { color: var(--gray); font-size: .9rem; display: flex; align-items: flex-start; gap: 8px; margin-bottom: 10px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-bottom p { color: var(--gray); font-size: .85rem; }
.footer-bottom span { color: var(--accent); }
.legal-links { display: flex; gap: 20px; }
.legal-links a { color: var(--gray); font-size: .82rem; transition: var(--transition); }
.legal-links a:hover { color: var(--accent); }

/* ===== BACK TO TOP ===== */
.back-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  border: none;
  color: var(--white);
  box-shadow: 0 4px 20px rgba(59,130,246,.4);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}
.back-top.show { opacity: 1; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); }

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity .5s, visibility .5s;
}
.loading-overlay.hidden { opacity: 0; visibility: hidden; }
.loader {
  width: 60px; height: 60px;
  border: 3px solid rgba(59,130,246,.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== ANIMATIONS ===== */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { display: none; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .about-inner { grid-template-columns: 1fr; gap: 48px; }
  .about-img-wrap { display: none; }
  .contact-inner { grid-template-columns: 1fr; gap: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  /* Logo légèrement réduit sur mobile */
  .logo-pill { padding: 4px 6px; border-radius: 10px; }
  .logo-img  { width: 46px; height: 46px; }
  .navbar { padding: 0 16px; }
  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--dark2);
    flex-direction: column;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,.06);
    transform: translateY(-110%);
    transition: var(--transition);
    gap: 4px;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { width: 100%; padding: 12px 16px; }
  .hamburger { display: flex; }
  .hero { padding: 100px 16px 60px; }
  .hero-title { font-size: 2.2rem; }
  .hero-stats { gap: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form-wrap { padding: 28px 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .about-values { grid-template-columns: 1fr; }
  .about-info-grid { grid-template-columns: 1fr; }
  .back-top { bottom: 16px; right: 16px; }
}

@media (max-width: 480px) {
  .services-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}