/* ============================================================
   UKTO — Stylesheet
   Dark theme + gradient bleu/vert
   ============================================================ */

:root {
  --bg: #04060f;
  --bg-2: #070b1a;
  --bg-3: #0b1226;
  --surface: rgba(15, 23, 42, 0.65);
  --surface-2: rgba(15, 23, 42, 0.9);
  --border: rgba(99, 179, 237, 0.18);
  --border-strong: rgba(99, 179, 237, 0.35);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-cyan: #22d3ee;
  --accent-teal: #22d3a8;
  --accent-green: #4ade80;
  --gradient: linear-gradient(90deg, #3b82f6 0%, #22d3ee 55%, #22d3a8 100%);
  --gradient-soft: linear-gradient(135deg, rgba(59, 130, 246, .14), rgba(34, 211, 168, .14));
  --shadow-glow: 0 10px 40px -10px rgba(34, 211, 238, 0.35);
  --radius: 14px;
  --radius-lg: 22px;
  --container: 1240px;
  --header-h: 80px;
}

* { box-sizing: border-box; }
*:before, *:after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(900px 600px at 80% -10%, rgba(34, 211, 168, .14), transparent 60%),
    radial-gradient(900px 600px at 0% 10%, rgba(59, 130, 246, .15), transparent 60%),
    radial-gradient(700px 500px at 50% 100%, rgba(34, 211, 238, .10), transparent 60%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent-cyan); color: #000;
  padding: 10px 16px; font-weight: 600; z-index: 200;
}
.skip-link:focus { left: 16px; top: 16px; }

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(4, 6, 15, 0.65);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.header.scrolled {
  background: rgba(4, 6, 15, 0.88);
  border-bottom-color: var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: var(--header-h);
}
.logo { display: inline-flex; align-items: center; }
.logo img { height: 56px; width: auto; }

.nav { flex: 1; }
.nav ul {
  display: flex;
  gap: 36px;
  margin: 0; padding: 0; list-style: none;
  justify-content: center;
}
.nav a {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 15px;
  position: relative;
  padding: 8px 2px;
  transition: color .25s;
}
.nav a:hover { color: var(--text); }
.nav a.active {
  color: var(--accent-cyan);
}
.nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  background: none; border: 0; cursor: pointer;
  width: 40px; height: 40px;
  padding: 8px;
  flex-direction: column;
  justify-content: space-around;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: flex;
  flex-direction: column;
  padding: 16px 28px 24px;
  gap: 4px;
  background: rgba(4, 6, 15, 0.96);
  border-bottom: 1px solid var(--border);
}
.mobile-nav a {
  padding: 14px 12px;
  border-radius: 8px;
  color: var(--text);
  font-weight: 500;
}
.mobile-nav a:hover { background: rgba(99, 179, 237, .08); }
.mobile-nav .btn { margin-top: 8px; justify-content: center; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  font-family: inherit;
  border: 0;
  cursor: pointer;
  transition: transform .2s, box-shadow .25s, background .25s, color .25s;
  white-space: nowrap;
  text-decoration: none;
}
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn svg { transition: transform .25s; }
.btn:hover svg { transform: translateX(3px); }

.btn-gradient {
  background: var(--gradient);
  color: #04060f;
  box-shadow: 0 8px 24px -6px rgba(34, 211, 238, 0.45);
}
.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px -8px rgba(34, 211, 238, 0.6);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border-strong);
  padding: 12.5px 26px;
}
.btn-ghost:hover {
  border-color: var(--accent-cyan);
  background: rgba(34, 211, 238, 0.08);
}

/* ===== HERO ===== */
.hero {
  padding: 64px 0 88px;
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  align-items: center;
  gap: 60px;
}
.hero-title {
  font-size: clamp(40px, 5.5vw, 76px);
  line-height: 1.05;
  font-weight: 800;
  margin: 0 0 28px;
  letter-spacing: -2px;
}
.hero-title span { display: block; }
.grad-blue, .grad-green {
  background: linear-gradient(90deg, #60a5fa, #3b82f6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.grad-green {
  background: linear-gradient(90deg, #4ade80, #22d3a8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-dim);
  max-width: 540px;
  margin: 0 0 36px;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.hero-badges {
  list-style: none;
  margin: 0; padding: 0;
  color: var(--text-dim);
  font-size: 14px;
}
.hero-badges li {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.hero-badges svg { color: var(--accent-teal); }
.hero-badges .dot { color: var(--accent-teal); margin: 0 4px; }

.hero-illu {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.hero-illu img {
  width: 100%;
  max-width: 600px;
  animation: float 8s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ===== SECTIONS ===== */
.section {
  padding: 88px 0;
  position: relative;
}
.section-alt {
  background:
    linear-gradient(180deg, transparent, rgba(11, 18, 38, 0.5), transparent);
}
.section-head {
  margin-bottom: 56px;
}
.section-head-row {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 24px;
  flex-wrap: wrap;
}
.section-title {
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 800;
  margin: 0 0 12px;
  letter-spacing: -1px;
}
.section-sub {
  color: var(--text-dim);
  font-size: 16px;
  margin: 0;
}
.mini-title {
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 8px;
  color: var(--text);
}

.link-arrow {
  color: var(--accent-cyan);
  font-weight: 500;
  font-size: 15px;
  transition: color .2s, transform .2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.link-arrow:hover { color: var(--accent-teal); transform: translateX(2px); }

/* ===== CARDS (Services) ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform .3s, border-color .3s, background .3s;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
}
.card:hover::before { opacity: 1; }
.card-icon {
  width: 52px; height: 52px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent-cyan);
  position: relative;
  z-index: 1;
}
.card-title {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 12px;
  position: relative;
  z-index: 1;
}
.card-text {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.6;
  margin: 0;
  position: relative;
  z-index: 1;
}

/* ===== RÉALISATIONS ===== */
.realisations {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 28px;
}
.real-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .3s, border-color .3s;
}
.real-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
}
.real-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-3);
}
.real-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s;
}
.real-card:hover .real-image img { transform: scale(1.04); }
.real-body { padding: 28px; }
.real-cat {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}
.real-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 12px;
}
.real-desc {
  color: var(--text-dim);
  font-size: 15px;
  margin: 0 0 18px;
}
.real-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}
.real-tech li {
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid var(--border);
  color: var(--accent-cyan);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
}

/* ===== PROCESS ===== */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  list-style: none;
  margin: 0; padding: 0;
  counter-reset: step;
}
.process-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  transition: border-color .3s;
}
.process-step:hover { border-color: var(--border-strong); }
.step-num {
  font-size: 36px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 14px;
  letter-spacing: -2px;
}
.step-title { font-size: 18px; font-weight: 700; margin: 0 0 8px; }
.step-desc { color: var(--text-dim); font-size: 14px; margin: 0; }

/* ===== À PROPOS ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: start;
}
.about-p {
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.75;
  margin: 0 0 18px;
}
.expertise-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.expertise-list li {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 14px;
  align-items: start;
}
.expertise-list svg { color: var(--accent-teal); margin-top: 2px; }
.expertise-list strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}
.expertise-list span {
  display: block;
  color: var(--text-dim);
  font-size: 14px;
}

.about-stats {
  display: grid;
  gap: 16px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
}
.stat-val {
  font-size: 42px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -2px;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-lbl {
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 56px;
  align-items: start;
}
.contact-info {
  list-style: none; margin: 28px 0 0; padding: 0;
  display: grid; gap: 16px;
}
.contact-info li {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-dim);
}
.contact-info li svg { color: var(--accent-cyan); flex-shrink: 0; }
.contact-info a:hover { color: var(--accent-cyan); }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: grid;
  gap: 18px;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.contact-form label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}
.contact-form label span {
  display: block;
  margin-bottom: 8px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  background: rgba(4, 6, 15, 0.5);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  transition: border-color .2s, background .2s;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: 0;
  border-color: var(--accent-cyan);
  background: rgba(4, 6, 15, 0.8);
}
.contact-form textarea { resize: vertical; min-height: 140px; }
.contact-form .checkbox {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
}
.contact-form .checkbox input { width: auto; margin-top: 3px; }
.contact-form .checkbox span { margin: 0; }
.contact-form button { justify-content: center; margin-top: 6px; }

.alert {
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 14px;
  border: 1px solid;
}
.alert-success {
  background: rgba(34, 211, 168, .08);
  border-color: rgba(34, 211, 168, .3);
  color: #5eead4;
}
.alert-error {
  background: rgba(248, 113, 113, .08);
  border-color: rgba(248, 113, 113, .35);
  color: #fca5a5;
}

/* ===== FOOTER ===== */
.footer {
  margin-top: 64px;
  padding: 56px 0 24px;
  border-top: 1px solid var(--border);
  background: rgba(4, 6, 15, 0.6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 32px;
}
.footer-tagline {
  color: var(--text-dim);
  font-size: 14px;
  margin: 14px 0 0;
}
.footer h4 {
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.footer ul {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 10px;
}
.footer a {
  color: var(--text-dim);
  font-size: 14px;
  transition: color .2s;
}
.footer a:hover { color: var(--accent-cyan); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}
.footer-bottom p { margin: 0; }

/* ===== ANIMATIONS ===== */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s ease, transform .7s ease;
}
.fade-up.is-visible {
  opacity: 1;
  transform: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1100px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-grid > div:last-child { grid-column: span 3; }
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-illu { order: -1; }
  .hero-illu img { max-width: 420px; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .nav, .header-inner > .btn { display: none; }
  .nav-toggle { display: flex; }
  .header-inner { justify-content: space-between; }
}
@media (max-width: 700px) {
  .cards { grid-template-columns: 1fr; }
  .process { grid-template-columns: 1fr; }
  .realisations { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .hero { padding: 40px 0 64px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid > div:last-child { grid-column: span 1; }
  .container { padding: 0 20px; }
  .contact-form { padding: 24px; }
  .hero-ctas .btn { flex: 1; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .hero-illu img { animation: none; }
}