/* =========================================================
   COS CONSULTING — feuille de style commune
   Thème sombre, épuré, noir & blanc
   ========================================================= */

:root{
  --bg: #0a0a0b;
  --bg-alt: #141416;
  --bg-card: #17171a;
  --border: #2a2a2d;
  --border-light: #3a3a3e;
  --fg: #f4f4f3;
  --fg-muted: #a4a4a8;
  --fg-faint: #6f6f74;
  --white: #ffffff;
  --radius: 2px;
  --max-width: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container{
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

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

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

h1, h2, h3, h4{
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

h1{ font-size: clamp(2.1rem, 4vw, 3.2rem); font-weight: 700; }
h2{ font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3{ font-size: 1.15rem; }

p{ margin: 0 0 16px; color: var(--fg-muted); }

.eyebrow{
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 18px;
  border: 1px solid var(--border-light);
  padding: 6px 14px;
  border-radius: 999px;
}

.lead{
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 640px;
}

/* ---------- Boutons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
  border: 1px solid var(--white);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}
.btn-primary{
  background: var(--white);
  color: var(--bg);
}
.btn-primary:hover{
  background: transparent;
  color: var(--white);
}
.btn-outline{
  background: transparent;
  color: var(--fg);
  border-color: var(--border-light);
}
.btn-outline:hover{
  border-color: var(--white);
}
.btn-row{ display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }

/* ---------- Header ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,11,0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}
.logo{ display: flex; flex-direction: column; line-height: 1; }
.logo-mark{
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
}
.logo-sub{
  font-size: 0.6rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-top: 4px;
}

.main-nav{
  display: flex;
  align-items: center;
  gap: 36px;
}
.main-nav a{
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--fg-muted);
  padding: 8px 0;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active{
  color: var(--white);
  border-bottom-color: var(--white);
}
.main-nav a.nav-cta{
  color: var(--bg);
  background: var(--white);
  padding: 10px 20px;
  border-radius: var(--radius);
  border-bottom: none;
}
.main-nav a.nav-cta:hover{ background: var(--fg-muted); }

.nav-toggle{
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle span{
  display: block;
  height: 1px;
  margin: 0 9px;
  background: var(--fg);
}

/* ---------- Hero ---------- */
.hero{
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--border);
}
.hero-grid{
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: end;
}
.hero-aside{
  border-left: 1px solid var(--border);
  padding-left: 32px;
}
.hero-aside p{ font-size: 0.92rem; }

.page-hero{
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border);
}

/* ---------- Sections ---------- */
section{ padding: 88px 0; }
section.tight{ padding: 56px 0; }
.section-head{ max-width: 680px; margin-bottom: 48px; }
.divider{ border: none; border-top: 1px solid var(--border); margin: 0; }

/* ---------- Grilles / cartes ---------- */
.grid-3{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.grid-2{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.card{
  background: var(--bg);
  padding: 40px 32px;
}
.card .num{
  display: block;
  font-size: 0.75rem;
  color: var(--fg-faint);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}
.card h3{ color: var(--white); margin-bottom: 12px; }
.card p{ margin-bottom: 0; font-size: 0.94rem; }
.card a.card-link{
  display: inline-block;
  margin-top: 18px;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border-light);
}
.card a.card-link:hover{ color: var(--white); border-color: var(--white); }

/* ---------- Liste de prestations ---------- */
.service-list{ border-top: 1px solid var(--border); }
.service-row{
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}
.service-row .num{ color: var(--fg-faint); font-size: 0.85rem; padding-top: 4px; }
.service-row h3{ margin-bottom: 8px; }
.service-row p{ margin-bottom: 0; }

/* ---------- Formules / pricing ---------- */
.plan{
  background: var(--bg);
  padding: 44px 32px;
  display: flex;
  flex-direction: column;
}
.plan.featured{ background: var(--bg-alt); }
.plan h3{ color: var(--white); }
.plan .plan-tag{
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 18px;
}
.plan .plan-price{
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
  margin: 20px 0;
}
.plan .plan-price small{
  display: block;
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-top: 6px;
}
.plan ul{
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  flex-grow: 1;
}
.plan li{
  padding: 10px 0;
  border-top: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--fg-muted);
}
.plan li:first-child{ border-top: none; }

/* ---------- CTA band ---------- */
.cta-band{
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 72px 0;
  text-align: center;
}
.cta-band h2{ margin-bottom: 12px; }
.cta-band p{ max-width: 520px; margin-left: auto; margin-right: auto; }
.cta-band .btn-row{ justify-content: center; }

/* ---------- Formulaire de contact ---------- */
.contact-grid{
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.contact-info{ background: var(--bg); padding: 48px 40px; }
.contact-form-wrap{ background: var(--bg-alt); padding: 48px 40px; }
.contact-info .info-item{ margin-bottom: 28px; }
.contact-info .info-item .label{
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 6px;
}
.contact-info .info-item a,
.contact-info .info-item span{
  font-size: 1.05rem;
  color: var(--fg);
}
.contact-info .info-item a:hover{ color: var(--white); border-bottom: 1px solid var(--white); }

form{ display: flex; flex-direction: column; gap: 20px; }
.form-row{ display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field{ display: flex; flex-direction: column; gap: 8px; }
.field label{
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
.field input,
.field select,
.field textarea{
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  color: var(--fg);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 13px 14px;
  width: 100%;
}
.field select{ appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--fg-muted) 50%), linear-gradient(135deg, var(--fg-muted) 50%, transparent 50%); background-position: calc(100% - 20px) center, calc(100% - 15px) center; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; }
.field textarea{ resize: vertical; min-height: 140px; }
.field input:focus,
.field select:focus,
.field textarea:focus{ outline: none; border-color: var(--white); }
.field-note{ font-size: 0.78rem; color: var(--fg-faint); }
.hp-field{ position: absolute; left: -9999px; opacity: 0; }
.form-status{ font-size: 0.9rem; margin-top: -4px; min-height: 20px; }
.form-status.success{ color: var(--fg); }
.form-status.error{ color: #e7a2a2; }

/* ---------- Footer ---------- */
.site-footer{ border-top: 1px solid var(--border); padding-top: 64px; }
.footer-inner{
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand p{ font-size: 0.88rem; max-width: 260px; margin-top: 14px; }
.footer-col h4{
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 18px;
}
.footer-col a{ display: block; font-size: 0.9rem; color: var(--fg-muted); margin-bottom: 12px; }
.footer-col a:hover{ color: var(--white); }
.footer-bottom{
  border-top: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p{ margin: 0; font-size: 0.78rem; color: var(--fg-faint); }

/* ---------- Responsive ---------- */
@media (max-width: 860px){
  .hero-grid, .grid-3, .grid-2, .contact-grid, .form-row, .footer-inner{
    grid-template-columns: 1fr;
  }
  .hero-aside{ border-left: none; border-top: 1px solid var(--border); padding-left: 0; padding-top: 24px; }
  .main-nav{
    position: absolute;
    top: 84px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 32px 24px;
    display: none;
  }
  .main-nav.open{ display: flex; }
  .main-nav a{ width: 100%; padding: 14px 0; border-bottom: 1px solid var(--border); }
  .main-nav a.nav-cta{ margin-top: 12px; text-align: center; }
  .nav-toggle{ display: flex; }
  .container{ padding: 0 20px; }
  section{ padding: 64px 0; }
}