/* ============================================================
   MAIN.CSS — Variables → Reset → Layout
   Architecture : variables · reset · typography · layout · nav
   ============================================================ */

/* ─── 1. VARIABLES (Design System "Dark Craft") ─────────────── */
:root {
  /* Couleurs */
  --color-bg-primary:    #0d1117;
  --color-bg-secondary:  #131c2b;
  --color-bg-surface:    #1e2a38;
  --color-bg-light:      #f0f4f8;
  --color-bg-light-alt:  #e8edf3;

  --color-text-primary:   #f0f6ff;
  --color-text-secondary: #8b9ab0;
  --color-text-dark:      #1a202c;
  --color-text-muted:     #4a5568;

  --color-accent:         #1a6cff;
  --color-accent-hover:   #0d47c7;
  --color-accent-light:   rgba(26, 108, 255, 0.12);
  --color-success:        #00d98b;
  --color-error:          #ff4d6d;
  --color-warning:        #ffb020;

  --color-border:         rgba(240, 246, 255, 0.08);
  --color-border-light:   rgba(26, 108, 255, 0.25);

  /* Typographie */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;

  --leading-tight:  1.25;
  --leading-snug:   1.375;
  --leading-normal: 1.6;

  --font-weight-normal:  400;
  --font-weight-medium:  500;
  --font-weight-bold:    700;

  /* Espacement (échelle 8px) */
  --space-1:   0.5rem;   /*  8px */
  --space-2:   1rem;     /* 16px */
  --space-3:   1.5rem;   /* 24px */
  --space-4:   2rem;     /* 32px */
  --space-5:   2.5rem;   /* 40px */
  --space-6:   3rem;     /* 48px */
  --space-7:   3.5rem;   /* 56px */
  --space-8:   4rem;     /* 64px */
  --space-9:   5rem;     /* 80px */
  --space-10:  6rem;     /* 96px */
  --space-11:  8rem;     /* 128px */
  --space-12: 10rem;     /* 160px */

  /* Layout */
  --max-width:      1320px;
  --container-pad:  var(--space-2);

  /* Effets */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   20px;
  --radius-full: 9999px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
  --shadow-md:  0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.5);
  --shadow-accent: 0 0 24px rgba(26,108,255,.25);

  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  --nav-height: 70px;
}

/* ─── 2. RESET ───────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

img, video, svg {
  display: block;
  max-width: 100%;
}

ul, ol { list-style: none; }

a {
  color: inherit;
  text-decoration: none;
}

button, input, textarea, select {
  font: inherit;
  border: none;
  background: none;
}

button { cursor: pointer; }

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

p { color: var(--color-text-secondary); }

code, kbd, pre { font-family: var(--font-mono); }

/* Focus visible accessible */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ─── 3. TYPOGRAPHIE GLOBALE ─────────────────────────────────── */
.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2);
}

.section-title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: var(--leading-normal);
}

/* ─── 4. LAYOUT ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

section { padding-block: var(--space-9); }

.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.section-header .section-subtitle {
  margin-inline: auto;
}

/* Grilles */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-4);
}

/* ─── 5. NAVIGATION ──────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background-color: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base),
              box-shadow var(--transition-base);
}

.site-header.scrolled {
  background-color: rgba(13, 17, 23, 0.97);
  box-shadow: var(--shadow-md);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo mark + wordmark */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
}

.nav__logo-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.nav__logo:hover .nav__logo-mark {
  opacity: 0.8;
}

.nav__logo-text {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

.nav__logo-dot {
  color: var(--color-accent);
}

.nav__logo:hover .nav__logo-text {
  color: var(--color-accent);
}

/* Desktop links */
.nav__list {
  display: none;
  align-items: center;
  gap: var(--space-4);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  padding-block: var(--space-1);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--color-text-primary);
}

.nav__link[aria-current="page"]::after,
.nav__link:hover::after {
  transform: scaleX(1);
}

/* Desktop actions : status + CTA */
.nav__actions {
  display: none;
  align-items: center;
  gap: var(--space-3);
}

.nav__status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.nav__status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
  flex-shrink: 0;
  position: relative;
}

.nav__status-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: #22c55e;
  opacity: 0.25;
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 0.25; }
  50%       { transform: scale(2); opacity: 0; }
}

/* Mobile toggle */
.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile overlay (pleine hauteur) */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-primary);
  flex-direction: column;
  justify-content: space-between;
  z-index: 99;
  overflow-y: auto;
}

.nav__mobile.is-open {
  display: flex;
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-3);
}

.nav__mobile-link {
  display: block;
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.nav__mobile-link:first-child {
  border-top: 1px solid var(--color-border);
}

.nav__mobile-link:hover,
.nav__mobile-link[aria-current="page"] {
  color: var(--color-text-primary);
  padding-left: var(--space-4);
}

.nav__mobile-footer {
  padding: var(--space-4) var(--space-3);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.nav__mobile-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Page offset pour header fixe */
.page-content { padding-top: var(--nav-height); }

/* ─── 6. FOOTER ──────────────────────────────────────────────── */
.site-footer {
  background-color: var(--color-bg-secondary);
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--color-accent) 0%, rgba(26,108,255,0.15) 60%, transparent 100%) 1;
  padding-block: var(--space-8) var(--space-4);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

/* Brand column */
.footer__brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
  text-decoration: none;
}

.footer__brand-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.footer__brand-name {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.footer__brand-name span { color: var(--color-accent); }

.footer__brand-desc {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  max-width: 280px;
  line-height: var(--leading-normal);
  margin-bottom: var(--space-3);
}

.footer__socials {
  display: flex;
  gap: var(--space-2);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast),
              border-color var(--transition-fast);
}

.footer__social-link:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.footer__social-link svg {
  width: 18px;
  height: 18px;
}

.footer__heading {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  padding-block: 2px;
}

.footer__link:hover { color: var(--color-accent); }

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  text-align: center;
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.footer__legal {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.footer__legal-link {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__legal-link:hover { color: var(--color-accent); }

/* ─── 7. SECTIONS DARK / LIGHT ───────────────────────────────── */
.section--dark {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
}

.section--dark-alt {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

.section--light {
  background-color: var(--color-bg-light);
  color: var(--color-text-dark);
}

.section--light .section-title,
.section--light h2,
.section--light h3 {
  color: var(--color-text-dark);
}

.section--light .section-label {
  color: var(--color-accent);
}

.section--light p { color: var(--color-text-muted); }

/* ─── 8. BREAKPOINTS ─────────────────────────────────────────── */
@media (min-width: 480px) {
  :root { --container-pad: var(--space-3); }
}

@media (min-width: 768px) {
  :root { --container-pad: var(--space-4); }

  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

@media (min-width: 1024px) {
  :root { --container-pad: var(--space-6); }

  .grid-3 { grid-template-columns: repeat(3, 1fr); }

  .nav__list    { display: flex; }
  .nav__actions { display: flex; }
  .nav__toggle  { display: none; }
}

@media (min-width: 1280px) {
  :root { --container-pad: var(--space-8); }
}

/* ─── 9. REDUCED MOTION ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}