/* ===== TOKENS ===== */
:root{
  --navy-deep: #060b14;
  --navy: #0d1b2e;
  --steel: #1c2e44;
  --steel-light: #2f4054;
  --chrome-1: #46586e;
  --chrome-2: #7d8ea3;
  --chrome-3: #b7c2d0;
  --silver: #e4e9ee;
  --white: #f6f8fa;
  --accent: #5b8fc7;
  --accent-bright: #86b6e8;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius: 4px;
  --max-width: 1180px;
}

*{ box-sizing: border-box; margin:0; padding:0; }

html{ scroll-behavior: smooth; }

body{
  background: transparent;
  color: var(--silver);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
button{ font-family: inherit; cursor:pointer; border:none; background:none; }

h1,h2,h3{ font-family: var(--font-display); font-weight:600; letter-spacing:-0.01em; color: var(--white); }

/* Fond animé : dégradés gris-bleu doux qui se déplacent lentement sur toute la page */
.ambient-bg{
  position: fixed; inset:0; z-index:-1;
  background-color: var(--navy-deep);
  background-image:
    radial-gradient(48% 38% at 18% 22%, rgba(125,142,163,0.30), transparent 65%),
    radial-gradient(42% 34% at 82% 18%, rgba(70,88,110,0.34), transparent 65%),
    radial-gradient(55% 45% at 30% 85%, rgba(91,143,199,0.22), transparent 65%),
    radial-gradient(45% 40% at 78% 78%, rgba(183,194,208,0.14), transparent 65%);
  background-repeat: no-repeat;
  background-size: 160% 160%;
  animation: drift 22s ease-in-out infinite alternate;
}
@keyframes drift{
  0%{ background-position: 0% 0%, 100% 0%, 20% 100%, 100% 100%; }
  50%{ background-position: 20% 30%, 80% 20%, 40% 80%, 80% 70%; }
  100%{ background-position: 10% 10%, 90% 30%, 10% 90%, 90% 90%; }
}
@media (prefers-reduced-motion: reduce){
  .ambient-bg{ animation: none; }
}

/* Lignes graphiques diagonales qui traversent la page en bougeant */
.lines-bg{
  position: fixed; inset:0; z-index:-1; pointer-events:none;
  overflow:hidden;
}
.lines-bg::before, .lines-bg::after{
  content:'';
  position:absolute; top:-20%; left:-20%; width:140%; height:140%;
  background-repeat: repeat;
  background-image: repeating-linear-gradient(
    115deg,
    transparent 0,
    transparent 140px,
    rgba(183,194,208,0.10) 141px,
    rgba(183,194,208,0.10) 142px,
    transparent 143px
  );
  animation: sweep 16s linear infinite;
}
.lines-bg::after{
  background-image: repeating-linear-gradient(
    65deg,
    transparent 0,
    transparent 220px,
    rgba(91,143,199,0.10) 221px,
    rgba(91,143,199,0.10) 222px,
    transparent 223px
  );
  animation: sweep 24s linear infinite reverse;
}
@keyframes sweep{
  0%{ transform: translate(0, 0); }
  100%{ transform: translate(160px, 160px); }
}
@media (prefers-reduced-motion: reduce){
  .lines-bg::before, .lines-bg::after{ animation: none; }
}

/* subtle grain / noise overlay for a metallic, non-flat feel */
.grain{
  position: fixed; inset:0; pointer-events:none; z-index: 500;
  opacity: 0.035; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family: var(--font-display);
  font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent-bright);
  margin-bottom: 18px;
}
.eyebrow-dark{ color: var(--chrome-1); }
.dot{ width:6px; height:6px; border-radius:50%; background: var(--accent-bright); box-shadow: 0 0 8px var(--accent-bright); }
.eyebrow-dark .dot{ background: var(--chrome-2); box-shadow:none; }

/* ===== NAV ===== */
.nav{
  position: sticky; top:0; z-index: 100;
  background: rgba(6,11,20,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(183,194,208,0.1);
}
.nav-inner{
  max-width: var(--max-width); margin:0 auto; padding: 16px 24px;
  display:flex; align-items:center; justify-content:space-between;
}
.logo{ display:flex; align-items:center; gap:10px; }
.logo-mark{
  width:34px; height:34px; border-radius: 6px;
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:700; font-size:0.85rem; color: var(--navy-deep);
  background: linear-gradient(135deg, var(--silver), var(--chrome-2) 55%, var(--chrome-1));
}
.logo-mark.small{ width:28px; height:28px; font-size:0.72rem; }
.logo-text{ font-family: var(--font-display); font-weight:600; font-size:1.05rem; color: var(--white); }

.nav-links{ display:flex; align-items:center; gap:32px; }
.nav-links a{ font-size:0.92rem; color: var(--chrome-3); transition: color 0.2s; }
.nav-links a:hover{ color: var(--white); }
.nav-cta{
  padding:9px 18px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent), var(--accent-bright));
  color: var(--navy-deep) !important; font-weight:600;
}
.nav-cta:hover{ opacity:0.92; color: var(--navy-deep) !important; }

.nav-burger{ display:none; flex-direction:column; gap:5px; }
.nav-burger span{ width:22px; height:2px; background: var(--silver); }

/* ===== HERO ===== */
.hero{
  position: relative;
  padding: 110px 24px 90px;
  background:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(91,143,199,0.1), transparent 60%),
    linear-gradient(180deg, rgba(6,11,20,0.35) 0%, rgba(13,27,46,0.45) 55%, rgba(28,46,68,0.5) 100%);
  overflow:hidden;
}
.hero-inner{ max-width: var(--max-width); margin:0 auto; position:relative; z-index:2; }
.hero-plate{
  position:absolute; top:-20%; right:-15%; width:60%; height:140%;
  background: conic-gradient(from 210deg at 50% 50%, var(--steel), var(--chrome-1) 20%, var(--navy) 40%, var(--chrome-2) 55%, var(--steel) 75%, var(--navy) 100%);
  opacity:0.35; filter: blur(60px);
  z-index:1;
}
.hero-title{
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  line-height:1.06;
  max-width: 780px;
  margin-bottom: 26px;
}
.metal-text{
  background: linear-gradient(100deg, var(--chrome-3) 0%, var(--white) 20%, var(--chrome-2) 40%, var(--white) 60%, var(--chrome-3) 80%);
  background-size: 250% auto;
  -webkit-background-clip: text; background-clip:text; -webkit-text-fill-color: transparent;
  animation: shine 7s linear infinite;
}
@keyframes shine{
  0%{ background-position: 0% 50%; }
  100%{ background-position: -250% 50%; }
}
.hero-sub{
  max-width: 560px; font-size: 1.08rem; color: var(--chrome-3); margin-bottom: 40px;
}
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom: 64px; }

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding: 14px 28px; border-radius: var(--radius);
  font-family: var(--font-display); font-weight:600; font-size:0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}
.btn-primary{
  background: linear-gradient(135deg, var(--accent-bright), var(--accent) 70%);
  color: var(--navy-deep);
  box-shadow: 0 8px 24px rgba(91,143,199,0.25);
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 12px 28px rgba(91,143,199,0.35); }
.btn-ghost{
  border: 1px solid rgba(183,194,208,0.35); color: var(--white);
}
.btn-ghost:hover{ border-color: var(--accent-bright); color: var(--accent-bright); }
.btn-block{ width:100%; }

.hero-stats{ display:flex; gap:48px; flex-wrap:wrap; border-top: 1px solid rgba(183,194,208,0.15); padding-top: 32px; }
.stat{ display:flex; flex-direction:column; gap:4px; }
.stat-num{ font-family: var(--font-display); font-size:1.6rem; font-weight:700; color: var(--white); }
.stat-label{ font-size:0.82rem; color: var(--chrome-2); }

/* ===== SECTION HEAD (shared) ===== */
.section-head{ max-width: 640px; margin: 0 auto 56px; text-align:center; }
.section-head h2{ font-size: clamp(1.8rem, 3.5vw, 2.6rem); margin-bottom:14px; }
.section-sub{ color: var(--chrome-2); font-size:1.02rem; }
.section-sub.light{ color: var(--chrome-3); }

/* ===== OFFER ===== */
.offer{
  padding: 100px 24px;
  background: rgba(13,27,46,0.4);
}
.offer-cards{
  max-width: 1280px; margin: 0 auto;
  display:grid; grid-template-columns: 1fr 1fr 1fr; gap:24px; align-items:start;
}
.offer-card{
  background: linear-gradient(160deg, var(--steel), var(--navy) 70%);
  border: 1px solid rgba(183,194,208,0.15);
  border-radius: 10px;
  padding: 32px 28px;
  position: relative;
  overflow:hidden;
  display:flex; flex-direction:column;
}
.offer-card-highlight{
  border-color: rgba(134,182,232,0.45);
  box-shadow: 0 20px 50px rgba(91,143,199,0.18);
}
.offer-badge{
  position:absolute; top:18px; right:18px;
  padding: 5px 12px; border-radius: 20px;
  font-family: var(--font-display); font-size:0.7rem; font-weight:600; letter-spacing:0.04em;
  color: var(--navy-deep);
  background: linear-gradient(135deg, var(--accent-bright), var(--accent));
}
.offer-card::before{
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background: linear-gradient(90deg, var(--chrome-1), var(--accent-bright), var(--chrome-1));
}
.offer-card-top{
  display:flex; justify-content:space-between; align-items:flex-start; gap:24px;
  flex-wrap:wrap;
  border-bottom: 1px solid rgba(183,194,208,0.15);
  padding-bottom: 28px; margin-bottom: 28px;
}
.offer-card-top h3{ font-size:1.4rem; margin-bottom:8px; }
.offer-card-top p{ color: var(--chrome-2); max-width: 340px; }
.offer-price{ text-align:right; }
.price-num{
  display:block; font-family: var(--font-display); font-weight:700;
  font-size: 2.6rem;
  background: linear-gradient(100deg, var(--chrome-3), var(--white) 30%, var(--accent-bright) 60%, var(--chrome-3));
  -webkit-background-clip: text; background-clip:text; -webkit-text-fill-color: transparent;
}
.price-note{ font-size:0.82rem; color: var(--chrome-2); }
.offer-list{ margin-bottom: 32px; }
.offer-list li{
  position:relative; padding-left: 26px; margin-bottom: 14px; color: var(--chrome-3); font-size:0.98rem;
}
.offer-list li::before{
  content:''; position:absolute; left:0; top:7px; width:14px; height:14px; border-radius:50%;
  background: linear-gradient(135deg, var(--accent-bright), var(--accent));
}
.offer-list li::after{
  content:'✓'; position:absolute; left:2.5px; top:0.5px; font-size:0.68rem; color: var(--navy-deep); font-weight:700;
}
.tag-plus{
  display:inline-block; margin-left:8px; padding:2px 9px; border-radius:20px;
  font-family: var(--font-display); font-size:0.68rem; font-weight:600; letter-spacing:0.03em;
  color: var(--accent-bright);
  background: rgba(134,182,232,0.12);
  border: 1px solid rgba(134,182,232,0.3);
  vertical-align: middle;
}

.offer-terms{
  display:grid; grid-template-columns: 1fr 1fr; gap:18px;
  margin-bottom: 32px;
}
.term{
  padding: 20px; border-radius: 8px;
  background: rgba(6,11,20,0.4);
  border: 1px solid rgba(183,194,208,0.15);
}
.term h4{
  font-family: var(--font-display); font-size:0.85rem; letter-spacing:0.06em; text-transform:uppercase;
  color: var(--accent-bright); margin-bottom:10px;
}
.term p{ color: var(--chrome-3); font-size:0.9rem; }
@media (max-width: 560px){
  .offer-terms{ grid-template-columns: 1fr; }
}

/* ===== PROCESS ===== */
.process{ padding: 100px 24px; background: rgba(6,11,20,0.3); }
.process-grid{
  max-width: var(--max-width); margin:0 auto;
  display:grid; grid-template-columns: repeat(4, 1fr); gap:28px;
}
.step{
  padding: 28px 22px; border-radius: 8px;
  background: linear-gradient(160deg, rgba(47,64,84,0.5), rgba(13,27,46,0.4));
  border: 1px solid rgba(183,194,208,0.1);
}
.step-num{
  display:inline-flex; align-items:center; justify-content:center;
  width:38px; height:38px; margin-bottom:16px; border-radius:6px;
  font-family: var(--font-display); font-size:0.95rem; font-weight:700;
  color: var(--accent-bright);
  background: rgba(134,182,232,0.1);
  border: 1px solid rgba(134,182,232,0.25);
}
.step h3{ font-size:1.1rem; margin-bottom:10px; }
.step p{ color: var(--chrome-2); font-size:0.92rem; }

/* ===== WHY ===== */
/* ===== PORTFOLIO ===== */
.portfolio{ padding: 100px 24px; background: rgba(13,27,46,0.4); }
.portfolio-grid{
  max-width: var(--max-width); margin:0 auto;
  display:grid; grid-template-columns: repeat(2, 1fr); gap:24px;
}
.portfolio-card{
  display:flex; flex-direction:column; gap:14px;
  padding: 28px 26px; border-radius: 10px;
  background: linear-gradient(160deg, var(--steel), var(--navy) 80%);
  border: 1px solid rgba(183,194,208,0.15);
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.portfolio-card:hover{ transform: translateY(-3px); border-color: rgba(134,182,232,0.4); }
.portfolio-num{
  font-family: var(--font-display); font-size:0.85rem; font-weight:700;
  color: var(--chrome-2);
}
.portfolio-card h3{ font-size:1.2rem; }
.portfolio-link{
  display:inline-flex; align-items:center; gap:6px;
  font-family: var(--font-display); font-size:0.88rem; color: var(--accent-bright);
  word-break: break-all;
}
.arrow{ flex-shrink:0; }

.why{ padding: 100px 24px; background: linear-gradient(180deg, rgba(13,27,46,0.35), rgba(28,46,68,0.45) 120%); }
.why-grid{
  max-width: var(--max-width); margin:0 auto;
  display:grid; grid-template-columns: repeat(3,1fr); gap:28px;
}
.why-card{
  padding: 32px 26px; border-radius: 8px;
  background: rgba(6,11,20,0.35);
  border: 1px solid rgba(183,194,208,0.12);
}
.why-card h3{ font-size:1.1rem; margin-bottom:12px; color: var(--accent-bright); }
.why-card p{ color: var(--chrome-3); font-size:0.94rem; }
.why-icon{
  display:inline-flex; align-items:center; justify-content:center;
  width:38px; height:38px; margin-bottom:16px; border-radius:6px;
  font-family: var(--font-display); font-size:0.95rem; font-weight:700;
  color: var(--accent-bright);
  background: rgba(134,182,232,0.1);
  border: 1px solid rgba(134,182,232,0.25);
}

/* ===== CONTACT ===== */
.contact{ padding: 100px 24px; background: rgba(6,11,20,0.3); }
.contact-inner{
  max-width: var(--max-width); margin:0 auto;
  display:grid; grid-template-columns: 1fr 1fr; gap:64px; align-items:start;
}
.contact-left h2{ font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-bottom:16px; }
.contact-details{ display:flex; flex-direction:column; gap:16px; margin-top: 32px; }
.contact-detail{
  display:flex; flex-direction:column; gap:4px;
  font-family: var(--font-display); font-size:1.05rem; color: var(--white);
  transition: color 0.2s;
}
.contact-detail:hover{ color: var(--accent-bright); }
.contact-label{
  font-family: var(--font-body); font-size:0.78rem; letter-spacing:0.1em; text-transform:uppercase;
  color: var(--chrome-2); font-weight:500;
}
.contact-form{
  background: linear-gradient(160deg, var(--steel), var(--navy) 80%);
  border: 1px solid rgba(183,194,208,0.15);
  border-radius: 10px;
  padding: 32px;
  display:flex; flex-direction:column; gap:18px;
}
.form-row{ display:flex; flex-direction:column; gap:8px; }
.form-row label{ font-size:0.84rem; color: var(--chrome-2); font-weight:500; }
.form-row input, .form-row textarea{
  background: rgba(6,11,20,0.5);
  border: 1px solid rgba(183,194,208,0.2);
  border-radius: var(--radius);
  padding: 12px 14px;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus{
  outline: none; border-color: var(--accent-bright);
  box-shadow: 0 0 0 3px rgba(134,182,232,0.15);
}
.form-status{ font-size:0.86rem; min-height: 20px; color: var(--chrome-2); }
.form-status.success{ color: #8fd19e; }
.form-status.error{ color: #e08a8a; }

/* ===== FOOTER ===== */
.footer{ padding: 32px 24px; border-top: 1px solid rgba(183,194,208,0.1); background: rgba(6,11,20,0.4); }
.footer-inner{
  max-width: var(--max-width); margin:0 auto;
  display:flex; align-items:center; gap:12px; flex-wrap:wrap;
  color: var(--chrome-2); font-size: 0.85rem;
}
.footer-inner a{ color: var(--chrome-2); transition: color 0.2s; }
.footer-inner a:hover{ color: var(--accent-bright); }
.footer-sep{ color: var(--chrome-1); }

/* ===== RESPONSIVE ===== */
@media (max-width: 860px){
  .nav-links{
    position:fixed; top:66px; left:0; right:0;
    flex-direction:column; align-items:flex-start; gap:0;
    background: var(--navy); border-bottom: 1px solid rgba(183,194,208,0.15);
    max-height:0; overflow:hidden; transition: max-height 0.25s ease;
  }
  .nav-links.open{ max-height: 320px; }
  .nav-links a{ width:100%; padding: 16px 24px; border-bottom: 1px solid rgba(183,194,208,0.08); }
  .nav-cta{ margin: 12px 24px; }
  .nav-burger{ display:flex; }

  .process-grid{ grid-template-columns: 1fr 1fr; }
  .portfolio-grid{ grid-template-columns: 1fr; }
  .why-grid{ grid-template-columns: 1fr; }
  .contact-inner{ grid-template-columns: 1fr; gap:40px; }
  .offer-card-top{ flex-direction:column; }
  .offer-cards{ grid-template-columns: 1fr; }
  .offer-price{ text-align:left; }
}
@media (max-width: 1100px) and (min-width: 861px){
  .offer-cards{ grid-template-columns: 1fr 1fr; }
  .offer-price{ text-align:left; }
}
@media (max-width: 560px){
  .process-grid{ grid-template-columns: 1fr; }
  .hero{ padding-top: 90px; }
  .hero-stats{ gap:28px; }
}

@media (prefers-reduced-motion: reduce){
  .metal-text{ animation: none; }
  html{ scroll-behavior: auto; }
}