/* ============================================================
   TRACEFLOW LAB — SITE WEB — DESIGN SYSTEM
   Dark-first, industrial-precision aesthetic
   Cohérent avec l'application TraceFlow
   ============================================================ */

/* ── VARIABLES ─────────────────────────────────────────────── */
:root {
  /* Dark (défaut) */
  --bg-base:         #0a0b0d;
  --bg-surface:      #111318;
  --bg-elevated:     #181c24;
  --bg-hover:        #1e2330;
  --border:          #252a38;
  --border-strong:   #2f3647;

  --text-primary:    #e8ecf4;
  --text-secondary:  #7a8399;
  --text-muted:      #4a5166;
  --text-accent:     #3de8a0;

  --accent:          #3de8a0;
  --accent-dim:      rgba(61,232,160,.12);
  --accent-glow:     rgba(61,232,160,.25);
  --shadow-accent:   0 0 40px rgba(61,232,160,.08);

  --danger:          #f25c5c;
  --danger-dim:      rgba(242,92,92,.12);
  --warning:         #f0a020;
  --info:            #4e9bff;
  --info-dim:        rgba(78,155,255,.12);
  --success:         #3de8a0;
  --purple:          #9b59b6;

  --font-display:    'Syne', sans-serif;
  --font-body:       'Inter', sans-serif;
  --font-mono:       'DM Mono', monospace;

  --radius-sm:       6px;
  --radius:          10px;
  --radius-lg:       16px;

  --shadow-sm:       0 2px 8px rgba(0,0,0,.4);
  --shadow-md:       0 4px 20px rgba(0,0,0,.5);
  --shadow-lg:       0 8px 40px rgba(0,0,0,.6);

  --nav-h:           68px;
  --container:       1160px;
  --transition:      150ms ease;
}

[data-theme="light"] {
  --bg-base:        #f0f2f7;
  --bg-surface:     #ffffff;
  --bg-elevated:    #f8f9fc;
  --bg-hover:       #eef0f6;
  --border:         #dde0ea;
  --border-strong:  #c8ccd8;

  --text-primary:   #121520;
  --text-secondary: #5a6282;
  --text-muted:     #9ba3bb;
  --text-accent:    #009960;

  --accent:         #009960;
  --accent-dim:     rgba(0,153,96,.08);
  --accent-glow:    rgba(0,153,96,.2);
  --shadow-accent:  0 0 40px rgba(0,153,96,.06);

  --danger:         #d94040;
  --danger-dim:     rgba(217,64,64,.08);
  --warning:        #c87800;
  --info:           #2563eb;
  --info-dim:       rgba(37,99,235,.08);
  --purple:         #7c3aed;

  --shadow-sm:      0 2px 8px rgba(0,0,0,.06);
  --shadow-md:      0 4px 20px rgba(0,0,0,.08);
  --shadow-lg:      0 8px 40px rgba(0,0,0,.12);
}

/* ── RESET ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background .3s, color .3s;
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; font-size: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ── SCROLLBAR ──────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── LAYOUT ─────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── NAVIGATION ─────────────────────────────────────────────── */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(10,11,13,.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: box-shadow .3s, background .3s;
}
[data-theme="light"] .nav-header {
  background: rgba(240,242,247,.9);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 40px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.logo-mark {
  width: 36px;
  height: 36px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -.5px;
  flex-shrink: 0;
}
.logo-text {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.2px;
}
.logo-text em {
  font-style: normal;
  color: var(--accent);
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}
.nav-link {
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-hover); }
.nav-link.active { color: var(--accent); background: var(--accent-dim); }

/* Nav controls */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex-shrink: 0;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 6px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.lang-toggle:hover { border-color: var(--accent); color: var(--text-primary); }
.lang-active { color: var(--accent); font-weight: 700; }
.lang-sep { color: var(--border-strong); }

.theme-toggle {
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; }
.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* Burger */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 9px;
}
.nav-burger span {
  display: block;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all .25s ease;
}
.nav-burger.open span:nth-child(1) { transform: rotate(45deg) translate(4.5px, 4.5px); }
.nav-burger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-burger.open span:nth-child(3) { transform: rotate(-45deg) translate(4.5px, -4.5px); }

/* ── SECTION COMMUNS ────────────────────────────────────────── */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
}
.section-tag::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ── BOUTONS ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -.1px;
  transition: all .2s ease;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary {
  background: var(--accent);
  color: #0a0b0d;
  border-color: var(--accent);
}
.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(61,232,160,.25);
}
.btn-primary:active { transform: scale(.98); }

.btn-ghost {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent-glow);
}
.btn-outline:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }

/* ── CARDS ──────────────────────────────────────────────────── */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color .2s, box-shadow .2s;
}
.card:hover { border-color: var(--border-strong); }

/* ── BADGE / TAG ────────────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .04em;
  white-space: nowrap;
}
.tag-accent  { background: var(--accent-dim); color: var(--accent); border: 1px solid var(--accent-glow); }
.tag-muted   { background: var(--bg-hover); color: var(--text-muted); border: 1px solid var(--border); }
.tag-info    { background: var(--info-dim); color: var(--info); border: 1px solid rgba(78,155,255,.3); }
.tag-danger  { background: var(--danger-dim); color: var(--danger); }

/* ── GRID FOND (effet app) ─────────────────────────────────── */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .5;
  pointer-events: none;
}
.bg-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61,232,160,.08) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -60%);
  pointer-events: none;
}
[data-theme="light"] .bg-glow {
  background: radial-gradient(circle, rgba(0,153,96,.06) 0%, transparent 70%);
}

/* ── FOOTER ─────────────────────────────────────────────────── */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand p {
  font-size: .875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 16px;
  max-width: 280px;
}
.footer-brand .nav-logo { margin-bottom: 4px; }
.footer-location {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 12px;
}
.footer-location svg { width: 13px; height: 13px; flex-shrink: 0; color: var(--accent); }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: .875rem;
  color: var(--text-secondary);
  padding: 4px 0;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.footer-langs {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-muted);
}
.footer-langs button {
  padding: 3px 6px;
  border-radius: 4px;
  transition: color .2s;
}
.footer-langs button:hover { color: var(--text-primary); }
.footer-langs span { color: var(--border-strong); }

/* ── FORMULAIRE CONTACT ─────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: .82rem; font-weight: 500; color: var(--text-secondary); }
.form-input, .form-textarea, .form-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  color: var(--text-primary);
  transition: border-color .2s, box-shadow .2s;
  width: 100%;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-textarea { resize: vertical; min-height: 120px; }

/* ── ANIMATIONS ─────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes glowPulse {
  0%, 100% { opacity: .6; }
  50%       { opacity: 1; }
}
@keyframes shimmer {
  from { transform: translateX(-100%); }
  to   { transform: translateX(100%); }
}

.anim-up       { animation: fadeUp .6s ease both; }
.anim-up-d1    { animation: fadeUp .6s .1s ease both; }
.anim-up-d2    { animation: fadeUp .6s .2s ease both; }
.anim-up-d3    { animation: fadeUp .6s .3s ease both; }
.anim-up-d4    { animation: fadeUp .6s .4s ease both; }
.anim-in       { animation: fadeIn .5s ease both; }

/* ── PAGE HERO (pages secondaires) ─────────────────────────── */
.page-hero {
  padding: calc(var(--nav-h) + 72px) 0 72px;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -.03em;
  margin-bottom: 16px;
  line-height: 1.1;
}
.page-hero p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 560px;
}

/* ── LEGAL PAGES ────────────────────────────────────────────── */
.legal-body {
  padding: 64px 0 96px;
}
.legal-content {
  max-width: 780px;
}
.legal-content h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 40px 0 12px;
  color: var(--text-primary);
}
.legal-content h2:first-child { margin-top: 0; }
.legal-content p {
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}
.legal-content ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 12px;
}
.legal-content ul li {
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  padding: 2px 0;
}
.legal-content a { color: var(--accent); }
.legal-content a:hover { text-decoration: underline; }
.legal-divider {
  height: 1px;
  background: var(--border);
  margin: 32px 0;
}
.legal-meta {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  :root { --nav-h: 60px; }
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    gap: 2px;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .nav-link { padding: 11px 14px; }
  .nav-burger { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .container { padding: 0 16px; }
}

@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .btn-lg { padding: 12px 20px; font-size: 14px; }
}