/* ──────────────────────────────────────────────────────────────────────
   TechEstrie Solutions IA – Premium Dark Theme
   Inspired by Stripe, Linear, Vercel, Framer
   ────────────────────────────────────────────────────────────────────── */
:root {
  --bg-primary: #070B14;
  --bg-secondary: #0F172A;
  --card-bg: rgba(255,255,255,0.04);
  --glass-bg: rgba(255,255,255,0.06);
  --primary: #2563EB;
  --primary-light: #60A5FA;
  --accent: #22C55E;
  --text: #F8FAFC;
  --text-secondary: #B4BCCF;
  --border-glow: rgba(37,99,235,0.3);
  --shadow: 0 12px 30px -15px rgba(0,0,0,0.2);
  --transition: all 0.3s ease;
  --radius: 12px;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text);
  line-height: 1.6;
  font-display: swap;
}

/* Font Loading Optimization */
@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v13/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfMZg.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v13/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfMZg.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v13/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfMZg.ttf') format('truetype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v13/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfMZg.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* Container */
.container { max-width:1200px; margin:auto; padding:0 1rem; }

/* Nav Link */
.nav-link {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}
.nav-link:hover { color: var(--primary); }
.nav-link.active { color: var(--primary); }

/* Hamburger */
.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: var(--transition);
}

/* CTA Row */
.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 2rem;
}
@media (max-width: 768px) {
  .cta-row {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
  .cta-row .btn {
    width: 100%;
    max-width: 320px;
    text-align: center;
  }
}

/* Language Switch */
.lang-switch {
  display:flex;
  align-items:center;
}
.lang-link {
  color: var(--text);
  text-decoration:none;
  margin:0 0.5rem;
  padding:0.2rem 0.5rem;
  border-radius:4px;
  font-weight:600;
  transition:var(--transition);
}
.lang-link:hover { background:rgba(255,255,255,0.1); }
.lang-link.active {
  color: var(--primary);
  background:rgba(37,99,235,0.15);
  border-radius:6px;
}
.lang-link:not(.active) {
  opacity:0.7;
}
.lang-link:not(.active):hover {
  opacity:1;
}
.lang-divider { color: var(--text-secondary); margin:0 0.3rem; }

/* CTA Link */
.cta-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}
.cta-link:hover { color: var(--primary-light); }

/* Benefits List */
.benefits-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  text-align: left;
}
.benefits-list li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
}
.benefits-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.result-card {
  background: var(--card-bg);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}
.result-card span {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-form { max-width: 700px; margin: auto; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
.form-group { display: flex; flex-direction: column; }
.form-group label { margin-bottom: 0.5rem; font-weight: 500; }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.8rem 1rem;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.2);
}

/* Why Choose Section */
.why-choose {
  padding: 6rem 20px;
}
.why-choose .section-title { margin-bottom: 3rem; }

/* Header – glassmorphism, scroll blur */
.site-header {
  position:fixed;
  top:0; left:0; width:100%; z-index:1000;
  transition:background 0.3s, backdrop-filter 0.3s;
}
.site-header.scrolled {
  background:rgba(17,24,39,0.85);
  backdrop-filter:blur(10px);
  box-shadow:0 4px 15px rgba(0,0,0,0.3);
}
.site-header .container {
  height:64px; 
  display:flex; 
  justify-content:space-between; 
  align-items:center;
}
.logo img { height:44px; }
.nav-menu { display:flex; gap:2rem; }
.nav-menu a {
  color:var(--text);
  font-weight:600;
  text-decoration:none;
  position:relative;
}
.nav-menu a::after {
  content:'';
  position:absolute;
  bottom:0; left:0;
  height:2px; width:0;
  background:var(--primary);
  transition:var(--transition);
}
.nav-menu a:hover::after { width:100%; }

/* Mobile Toggle */
.nav-toggle {
  display:none;
  background:var(--primary);
  padding:12px;
  border-radius:5px;
  text-align:center;
  cursor:pointer;
}
.nav-toggle .bar1, .nav-toggle .bar2, .nav-toggle .bar3 {
  display:block;
  width:24px;
  height:2px;
  background:var(--text);
  margin:5px 0;
  transition:var(--transition);
}

/* Navigation Menu – horizontal layout on desktop */
.nav-menu ul {
  display:flex;
  align-items:center;
  gap:2rem;
  list-style:none;
  margin:0;
  padding:0;
}
.nav-menu li {
  list-style:none;
  margin:0;
  padding:0;
}

/* Mobile Menu Panel */
.mobile-menu {
  position:fixed;
  top:66px;
  left:-100%;
  width:280px;
  height:calc(100vh-66px);
  background:var(--bg-secondary);
  backdrop-filter:blur(12px);
  padding:2rem 1rem;
  transform:translateX(-100%);
  transition:left 0.4s ease;
  z-index:900;
  overflow-y:auto;
}
.mobile-menu.open { left:0; }
.mobile-menu .close-btn {
  position:absolute;
  top:1rem;
  right:1rem;
  font-size:1.8rem;
  color:var(--text);
  cursor:pointer;
}
.mobile-menu .menu-items a {
  display:block;
  padding:15px 0;
  color:var(--text);
  font-weight:600;
}

/* Hero Premium */
.hero-premium {
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  position:relative;
  overflow:hidden;
}
.hero-content { text-align:center; max-width:800px; margin:auto; }
.hero-title { font-size:3rem; color:var(--text); margin-bottom:1rem; }
.hero-subtitle { font-size:1.2rem; color:var(--text-secondary); margin-bottom:2rem; }
.hero-cta {
  display:flex;
  flex-direction:column;
  gap:16px;
  align-items:center;
  width:100%;
}
.hero-cta .btn {
  display:block;
  width:100%;
  max-width:320px;
  margin:0;
}
.hero-halo {
  position:absolute;
  bottom:-50px;
  left:50%;
  transform:translateX(-50%);
  width:140px;
  height:140px;
  border-radius:50%;
  background:radial-gradient(circle,var(--primary-light),transparent);
  filter:blur(10px);
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%,100% { transform:translate(0,0); }
  50% { transform:translate(0,-10px); }
}
.hero-particles {
  position:absolute;
  inset:0;
  pointer-events:none;
}
.hero-particles::before,
.hero-particles::after {
  content:'';
  position:absolute;
  background:rgba(255,255,255,0.12);
  border-radius:50%;
  animation: shoot 8s linear infinite;
}
.hero-particles::before { width:6px; height:6px; top:10%; left:20%; animation-delay:0s; }
.hero-particles::after { width:10px; height:10px; top:60%; left:80%; animation-delay:1s; }
@keyframes shoot {
  0% { transform:translateY(-10vh) scale(0.1); opacity:0; }
  50% { opacity:1; }
  100% { transform:translateY(110vh) scale(1); opacity:0; }
}

/* Buttons */
.btn {
  background:var(--primary);
  color:var(--text);
  padding:0.9rem 2rem;
  border-radius:8px;
  font-weight:600;
  text-decoration:none;
  transition:var(--transition);
  border:none;
  cursor:pointer;
  font-size:1rem;
}
.btn-primary { background:var(--primary); }
.btn-outline { background:transparent; border:1px solid var(--primary); color:var(--primary); }
.btn:hover {
  transform:translateY(-2px);
  box-shadow:0 0 15px rgba(37,99,235,0.4);
}

/* Sections */
.section { padding:6rem 20px; }
.section-title { text-align:center; font-size:2.2rem; margin-bottom:2rem; color:var(--text); }
.section-text { text-align:center; max-width:700px; margin:auto; margin-bottom:2rem; color:var(--text-secondary); }

/* Service Cards */
.services-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(240px,1fr));
  gap:2rem;
}
.premium-card {
  background:var(--card-bg);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
  padding:2rem;
  text-align:center;
  box-shadow:var(--shadow);
  transition:var(--transition);
}
.premium-card:hover {
  transform:translateY(-6px);
  box-shadow:0 0 20px rgba(37,99,235,0.25);
}
.premium-card i { font-size:2.5rem; color:var(--primary); margin-bottom:1rem; }
.premium-card h3 { font-size:1.3rem; margin-bottom:0.5rem; color:var(--text); }

/* Why Choose Grid */
.why-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(240px,1fr));
  gap:1.5rem;
}
.why-card {
  background:var(--card-bg);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
  padding:1.5rem;
  text-align:center;
  transition:var(--transition);
}
.why-card:hover { transform:translateY(-4px); }
.why-card i { font-size:2rem; color:var(--primary); margin-bottom:0.8rem; }

/* Stats Grid */
.stats-grid {
  display:flex;
  flex-wrap:wrap;
  gap:2rem;
  justify-content:center;
}
.stat-card, .result-card {
  background:var(--card-bg);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
  padding:1.5rem;
  text-align:center;
  min-width:180px;
  transition:var(--transition);
}
.stat-card span, .result-card span {
  display:block;
  font-size:2rem;
  font-weight:700;
  color:var(--primary);
}

/* FAQ Accordion */
.faq-accordion { max-width:800px; margin:auto; }
.faq-question {
  width:100%;
  padding:1rem;
  background:var(--bg-secondary);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
  cursor:pointer;
  text-align:left;
  font-weight:600;
  color:var(--text);
  transition:var(--transition);
}
.faq-question:hover { background:rgba(255,255,255,0.06); }
.faq-answer {
  max-height:0;
  overflow:hidden;
  background:var(--bg-secondary);
  border:1px solid rgba(255,255,255,0.08);
  border-top:none;
  border-radius:0 0 var(--radius) var(--radius);
  padding:0 1rem;
  transition:max-height 0.3s ease, padding 0.3s ease;
}
.faq-question[aria-expanded="true"] + .faq-answer {
  max-height:500px;
  padding:1rem;
}

/* CTA Final */
.cta-final {
  background:linear-gradient(135deg,var(--primary),var(--accent));
  padding:4rem 20px;
  text-align:center;
}
.cta-final .btn-primary { background:#fff; color:var(--primary); }

/* Footer */
.site-footer {
  background:var(--bg-primary);
  color:var(--text-secondary);
  padding:3rem 20px;
}
.footer-columns {
  display:flex;
  flex-wrap:wrap;
  gap:2rem;
}
.footer-col {
  flex:1;
  min-width:200px;
}
.footer-col a { color:var(--text-secondary); text-decoration:none; }
.footer-col a:hover { color:var(--primary); }
.footer-bottom {
  text-align:center;
  margin-top:2rem;
  font-size:0.85rem;
}

/* Product Mockups */
.product-mockups { position:relative; overflow:hidden; }
.mockup-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(300px,1fr));
  gap:2rem;
  margin-top:3rem;
}
.mockup-card {
  background:var(--card-bg);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
  overflow:hidden;
  transition:var(--transition);
  box-shadow:var(--shadow);
}
.mockup-card:hover {
  transform:translateY(-10px);
  border-color:var(--primary);
  box-shadow:0 0 25px rgba(37,99,235,0.2);
}
.mockup-header {
  background:rgba(0,0,0,0.3);
  padding:12px;
  display:flex;
  gap:6px;
  border-bottom:1px solid rgba(255,255,255,0.05);
}
.mockup-header span {
  width:8px; height:8px; border-radius:50%;
  background:rgba(255,255,255,0.2);
}
.mockup-header span:nth-child(1) { background:#ff5f56; }
.mockup-header span:nth-child(2) { background:#ffbd2e; }
.mockup-header span:nth-child(3) { background:#27c93f; }
.mockup-body {
  padding:2rem;
  text-align:center;
  display:flex;
  flex-direction:column;
  align-items:center;
}
.mockup-body i { font-size:3rem; color:var(--primary); margin-bottom:1rem; }
.mockup-body h3 { margin-bottom:0.5rem; }

/* Testimonials Slider */
.testimonials-slider {
  display:flex;
  gap:2rem;
  overflow-x:auto;
  padding:2rem 0;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) transparent;
}
.testimonials-slider::-webkit-scrollbar { height: 6px; }
.testimonials-slider::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 10px; }

.testimonial-card {
  flex: 0 0 350px;
  background:var(--card-bg);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
  padding:2rem;
  scroll-snap-align: center;
  transition:var(--transition);
}
.testimonial-card:hover {
  background:rgba(255,255,255,0.06);
  border-color:var(--primary);
}
.testimonial-content {
  font-style:italic;
  color:var(--text-secondary);
  margin-bottom:1.5rem;
}
.testimonial-author {
  display:flex;
  align-items:center;
  gap:1rem;
}
.avatar {
  width:48px; height:48px;
  border-radius:50%;
  background:linear-gradient(45deg, var(--primary), var(--primary-light));
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:bold;
  color:white;
  border:2px solid var(--bg-primary);
}
.author-info h4 { font-size:1rem; color:var(--text); }
.author-info p { font-size:0.85rem; color:var(--text-secondary); }

/* Scroll Animations */
.animate-on-scroll {
  opacity:1;
  transform:translateY(0);
  transition:opacity 0.8s ease-out, transform 0.8s ease-out;
}
.animate-on-scroll.visible {
  opacity:1;
  transform:translateY(0);
}
.slide-left { transform:translateX(-30px); }
.slide-right { transform:translateX(30px); }
.slide-left.visible, .slide-right.visible { transform:translateX(0); }

/* Mobile Menu Overlay */
.mobile-overlay {
  position:fixed;
  inset:0;
  background:rgba(0,0,0,0.7);
  backdrop-filter:blur(4px);
  z-index:899;
  opacity:0;
  visibility:hidden;
  transition:var(--transition);
}
.mobile-overlay.active {
  opacity:1;
  visibility:visible;
}

/* Responsive */
@media (max-width:768px) {
  .hero-title { font-size:2rem; }
  .hero-subtitle { font-size:1rem; }
  .nav-menu { display:none; }
  .nav-toggle { display:block; }
  .mobile-menu { left:-100%; }
}
@media (max-width:480px) {
  .hero-title { font-size:1.8rem; }
  .btn { padding:0.7rem 1rem; }
}