/* ==========================================================================
   Lucas Fontaine — IA Locale & Ingénierie Web
   Style CSS pur, autonome et performant (Zero dependency)
   ========================================================================== */

:root {
  --bg-primary: #0A0E17;
  --bg-surface: #111827;
  --bg-surface-hover: #1A2234;
  --border: #1F2937;
  --border-active: #374151;
  --text-primary: #F9FAFB;
  --text-muted: #9CA3AF;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: #38BDF8;
  --accent-subtle: rgba(37, 99, 235, 0.12);
  --teal: #2DD4BF;
  --radius: 6px;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Base reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-color: var(--border);
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background-color: var(--bg-primary);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Page wrapper : fond sombre uni et profond assorti à l'animation, sans quadrillage artificiel */
.page-wrapper {
  min-height: 100vh;
  background-color: var(--bg-primary);
  /* Léger halo cobalt très diffus pour la profondeur, plus aucun quadrillage IA */
  background-image: radial-gradient(ellipse at 80% 20%, rgba(37, 99, 235, 0.07), transparent 60%);
  display: flex;
  flex-direction: column;
}

/* Container */
.container {
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: 24px;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background-color: rgba(10, 14, 23, 0.90);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  height: 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  padding: 2px 7px;
  border-radius: var(--radius);
  background-color: var(--accent-subtle);
  color: var(--accent-light);
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: color 150ms ease, background-color 150ms ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  width: auto;
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
  border: 1px solid transparent;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-active);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  border-color: #4B5563;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px;
  border-radius: var(--radius);
  cursor: pointer;
}

.mobile-nav-panel {
  display: none;
  flex-direction: column;
  padding: 16px 24px 20px;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  gap: 10px;
}

.mobile-nav-panel.open {
  display: flex;
}

.mobile-nav-item {
  color: var(--text-muted);
  font-size: 15px;
  padding: 8px 0;
  text-decoration: none;
}

.mobile-nav-item:hover {
  color: var(--text-primary);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 64px 0 88px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-main {
  position: relative;
  z-index: 3;
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.hero-main h1 {
  font-size: clamp(34px, 4.4vw, 48px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.16;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero-description {
  font-size: 16.5px;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 540px;
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-guarantees {
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.guarantee-title {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.guarantee-desc {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.45;
}

/* 3D Animated Artwork (Restored from the beginning) */
.hero-artwork-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 520px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.artwork-canvas {
  position: relative;
  width: 100%;
  height: 100%;
}

.artwork-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 46%, transparent 74%);
  mask-image: radial-gradient(ellipse at center, #000 46%, transparent 74%);
  filter: saturate(0.95) contrast(1.02);
}

.artwork-still {
  display: block;
}

.artwork-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Floating Signal Cards on the 3D artwork */
.signal-card {
  position: absolute;
  z-index: 4;
  width: min(340px, 85%);
  box-sizing: border-box;
  padding: 14px 16px;
  border: 1px solid var(--border-active);
  border-radius: var(--radius);
  background-color: rgba(17, 24, 39, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
  transition: transform 180ms ease, border-color 180ms ease;
}

.signal-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-light);
}

.signal-card-benchmark {
  top: 10%;
  left: -4%;
}

.signal-card-bastion {
  right: -2%;
  bottom: 8%;
}

.signal-card-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.signal-icon {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius);
  background-color: rgba(56, 189, 248, 0.08);
  color: var(--accent-light);
}

.signal-kicker {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent-light);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.signal-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.45;
}

/* Common Section */
.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 64px;
}

.section-header {
  max-width: 680px;
  margin-bottom: 44px;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-lead {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Grid Cards (Expertise) */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 150ms ease;
}

.card:hover {
  border-color: var(--border-active);
}

.card-icon {
  color: var(--accent-light);
  margin-bottom: 18px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.card-body {
  font-size: 14.5px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.card-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  color: #D1D5DB;
}

.card-specs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-specs svg {
  color: var(--accent-light);
  flex-shrink: 0;
}

/* Architecture Section */
.architecture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.arch-node {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.arch-step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 8px;
}

.arch-node-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.arch-node-text {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.55;
}

.infra-specs-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.infra-spec h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.infra-spec p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Method Section */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.process-step {
  border-top: 2px solid var(--border);
  padding-top: 20px;
}

.process-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 8px;
}

.process-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.process-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Demos / Use Cases */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.use-case-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.use-case-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: var(--radius);
  background-color: var(--bg-primary);
  color: var(--text-muted);
  border: 1px solid var(--border);
  margin-bottom: 14px;
  width: fit-content;
}

.use-case-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.use-case-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.use-case-footer {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-light);
}

/* Callout Box */
.contact-callout {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-active);
  border-radius: var(--radius);
  padding: 36px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.callout-text h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.callout-text p {
  font-size: 14.5px;
  color: var(--text-muted);
  max-width: 620px;
}

/* Mentions Légales */
.legal-section {
  padding: 56px 0;
  background-color: #070A10;
  border-top: 1px solid var(--border);
  scroll-margin-top: 64px;
}

.legal-box {
  max-width: 800px;
  margin-inline: auto;
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.7;
}

.legal-box h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.legal-box h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 6px;
}

.legal-box p {
  margin-bottom: 12px;
}

.legal-box a {
  color: var(--accent-light);
  text-decoration: none;
}

/* Footer */
.site-footer {
  background-color: #070A10;
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.footer-brand-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.footer-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  max-width: 380px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-muted);
  font-size: 13.5px;
  text-decoration: none;
  transition: color 150ms ease;
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12.5px;
  color: #6B7280;
  flex-wrap: wrap;
  gap: 12px;
}

/* 404 Error Page */
.error-page-wrapper {
  min-height: calc(100vh - 160px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
}

.error-card {
  max-width: 560px;
  width: 100%;
  text-align: center;
  padding: 48px 32px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.error-code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-light);
  background-color: var(--accent-subtle);
  border: 1px solid rgba(37, 99, 235, 0.3);
  padding: 4px 10px;
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.error-title {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.error-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 28px;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 960px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-artwork-wrapper {
    max-width: 440px;
  }
  .signal-card-benchmark {
    top: 5%;
    left: 0;
  }
  .signal-card-bastion {
    right: 0;
    bottom: 5%;
  }
  .grid-cards {
    grid-template-columns: 1fr;
  }
  .architecture-grid {
    grid-template-columns: 1fr;
  }
  .infra-specs-box {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .use-cases-grid {
    grid-template-columns: 1fr;
  }
  .contact-callout {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .desktop-nav, .header-cta-group .btn-primary {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-guarantees {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .process-steps {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 64px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}