/* ============================================================
   Lenergy SMART — Feuille de style principale
   Palette : Bleu tech #0EA5E9 / Jaune Lenergy #ffc451 / Sombre #0f172a
   Typo : Inter (auto-hébergée via Bunny Fonts)
   ============================================================ */

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

:root {
  --color-primary:    #0EA5E9;
  --color-primary-d:  #0284C7;
  --color-accent:     #ffc451;
  --color-dark:       #0f172a;
  --color-dark-2:     #1e293b;
  --color-dark-3:     #334155;
  --color-text:       #94a3b8;
  --color-text-light: #cbd5e1;
  --color-white:      #ffffff;
  --color-border:     rgba(148,163,184,0.15);
  --font-main:        'Inter', system-ui, -apple-system, sans-serif;
  --radius:           12px;
  --radius-lg:        20px;
  --shadow-card:      0 4px 24px rgba(0,0,0,0.25);
  --transition:       0.25s ease;
}

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

body {
  font-family: var(--font-main);
  background: var(--color-dark);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { text-decoration: none; color: inherit; transition: color var(--transition); }

ul { list-style: none; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Boutons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-d);
  border-color: var(--color-primary-d);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14,165,233,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.3);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-outline-light {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.4);
}
.btn-outline-light:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

/* ---- Navbar ---- */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(15,23,42,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
  font-weight: 800;
  letter-spacing: 0.05em;
}
.logo-group {
  font-size: 1.3rem;
  color: var(--color-white);
}
.logo-sub {
  font-size: 0.65rem;
  color: var(--color-primary);
  letter-spacing: 0.2em;
  font-weight: 700;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-menu a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: 8px;
  transition: all var(--transition);
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-white);
  background: rgba(255,255,255,0.07);
}

.btn-nav {
  background: var(--color-primary) !important;
  color: var(--color-white) !important;
  border-radius: 8px;
  font-weight: 600 !important;
}
.btn-nav:hover {
  background: var(--color-primary-d) !important;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---- Section Headers ---- */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  background: rgba(14,165,233,0.1);
  border: 1px solid rgba(14,165,233,0.25);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}
.section-header p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Hero ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,165,233,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(14,165,233,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px; left: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,196,81,0.07) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(255,196,81,0.1);
  border: 1px solid rgba(255,196,81,0.3);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-white);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}
.accent { color: var(--color-primary); }

.hero-lead {
  font-size: 1.2rem;
  max-width: 580px;
  color: var(--color-text-light);
  margin-bottom: 40px;
  line-height: 1.75;
}

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

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
}
.scroll-indicator {
  width: 24px; height: 40px;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  position: relative;
}
.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  animation: scrollDown 2s infinite;
}
@keyframes scrollDown {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 20px; }
}

/* ---- Pillars ---- */
.pillars {
  padding: 100px 0;
  background: var(--color-dark-2);
  position: relative;
}

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

.pillar-card {
  background: var(--color-dark);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  transition: all var(--transition);
}
.pillar-card:hover {
  border-color: rgba(14,165,233,0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.pillar-card.featured {
  background: linear-gradient(135deg, rgba(14,165,233,0.08) 0%, var(--color-dark) 100%);
  border-color: rgba(14,165,233,0.3);
}

.pillar-icon {
  width: 64px; height: 64px;
  background: rgba(14,165,233,0.1);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.pillar-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}
.pillar-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 24px;
}
.pillar-link {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: gap var(--transition);
}
.pillar-link:hover { color: var(--color-primary-d); }

.featured-badge {
  position: absolute;
  top: 20px; right: 20px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.05em;
}

/* ---- Stats ---- */
.stats {
  padding: 60px 0;
  background: var(--color-primary);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  text-align: center;
}
.stat-item {
  padding: 24px;
  border-right: 1px solid rgba(255,255,255,0.2);
}
.stat-item:last-child { border-right: none; }
.stat-number {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  font-weight: 500;
}

/* ---- Product Highlight ---- */
.product-highlight {
  padding: 100px 0;
  background: var(--color-dark);
}
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* Device mockup */
.device-mockup {
  width: 280px;
  margin: 0 auto;
  background: var(--color-dark-2);
  border-radius: 24px;
  padding: 20px;
  border: 1px solid var(--color-border);
  box-shadow: 0 32px 80px rgba(0,0,0,0.5);
}
.device-screen {
  background: #0a0f1e;
  border-radius: 16px;
  overflow: hidden;
}
.screen-header {
  display: flex;
  gap: 6px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.screen-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.screen-dot.red { background: #ff5f57; }
.screen-dot.yellow { background: #febc2e; }
.screen-dot.green { background: #28c840; }
.screen-content {
  padding: 24px;
}
.screen-label {
  font-size: 0.75rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}
.screen-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 16px;
}
.screen-value span { font-size: 1.2rem; color: var(--color-text); font-weight: 400; }
.screen-bar {
  height: 6px;
  background: var(--color-dark-3);
  border-radius: 3px;
  margin-bottom: 12px;
}
.screen-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 3px;
  transition: width 1s ease;
}
.screen-meta {
  font-size: 0.85rem;
  color: var(--color-text);
  margin-bottom: 16px;
}
.screen-meta strong { color: #22c55e; }
.screen-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--color-text);
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.8); }
}

.product-info .section-tag { margin-bottom: 12px; }
.product-info h2 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 8px;
}
.product-tagline {
  font-size: 1.2rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 20px;
}
.product-info p {
  margin-bottom: 28px;
  line-height: 1.75;
}
.product-features {
  margin-bottom: 32px;
}
.product-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-border);
}
.product-features li:last-child { border-bottom: none; }

/* ---- Approach ---- */
.approach {
  padding: 100px 0;
  background: var(--color-dark-2);
}
.approach-steps {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-top: 0;
}
.step {
  flex: 1;
  padding: 32px;
  background: var(--color-dark);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}
.step-number {
  font-size: 3rem;
  font-weight: 800;
  color: rgba(14,165,233,0.15);
  line-height: 1;
  margin-bottom: 16px;
}
.step h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}
.step p { font-size: 0.95rem; }
.step-arrow {
  font-size: 2rem;
  color: var(--color-primary);
  padding-top: 60px;
  flex-shrink: 0;
}

/* ---- CTA Section ---- */
.cta-section {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--color-dark-2) 0%, var(--color-dark) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(14,165,233,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.cta-section h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  position: relative;
}
.cta-section p {
  max-width: 560px;
  margin: 0 auto 36px;
  font-size: 1.05rem;
  position: relative;
}
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

/* ---- Footer ---- */
.footer {
  background: #080d18;
  border-top: 1px solid var(--color-border);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand p {
  margin-top: 16px;
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 280px;
}
.footer-brand .logo { margin-bottom: 8px; }
.footer-nav h3,
.footer-contact h3,
.footer-group h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-white);
  margin-bottom: 20px;
}
.footer-nav ul li,
.footer-group ul li {
  margin-bottom: 10px;
}
.footer-nav a,
.footer-group a {
  color: var(--color-text);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-nav a:hover,
.footer-group a:hover { color: var(--color-primary); }
.footer-contact address {
  font-style: normal;
  font-size: 0.9rem;
  line-height: 1.7;
}
.footer-contact a { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--color-text);
}
.footer-bottom a { color: var(--color-text); transition: color var(--transition); }
.footer-bottom a:hover { color: var(--color-primary); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .pillars-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stats .stat-item:nth-child(2) { border-right: none; }
  .product-grid { grid-template-columns: 1fr; text-align: center; }
  .device-mockup { margin-bottom: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--color-dark);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--color-border);
    gap: 4px;
  }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: flex; }
  .pillars-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .approach-steps { flex-direction: column; }
  .step-arrow { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .stat-item:last-child { border-bottom: none; }
  .hero h1 { font-size: 2rem; }
}