/* ============================================================
   FerOps — style.css
   Palette : fond sombre, accents orange-rouille, texte clair
   Typographie : Inter (Google Fonts)
   Mobile-first, vanilla CSS
   ============================================================ */

/* ---------- Reset & base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:        #0d0d0d;
  --bg-alt:    #141414;
  --bg-card:   #1a1a1a;
  --accent:    #c0392b;
  --accent2:   #e05a2b;
  --text:      #e8e8e8;
  --text-muted:#999;
  --border:    #2a2a2a;
  --radius:    6px;
  --max-w:     1100px;
  --nav-h:     64px;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent2);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

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

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

section { padding: 4rem 0; }

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.section-sub {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 560px;
}

/* ---------- NAV ---------- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,13,13,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
}

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

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}
.nav-links a.active {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

/* Lang toggle */
.lang-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  letter-spacing: 0.05em;
}
.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--accent2);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

/* Mobile nav */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0; bottom: 0;
  background: var(--bg);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.mobile-menu a:hover { color: var(--accent2); }
.mobile-menu .lang-toggle { margin-top: 1rem; }

/* ---------- HERO ---------- */
.hero {
  padding: 6rem 0 5rem;
  border-bottom: 1px solid var(--border);
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  max-width: 760px;
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.cta-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
  cursor: pointer;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 2px solid var(--accent);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent2); color: var(--accent2); }

/* ---------- Pillars ---------- */
.pillars { background: var(--bg-alt); }

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: border-color 0.2s;
}
.pillar-card:hover { border-color: var(--accent); }

.pillar-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: #c0392b;
  display: flex;
  align-items: center;
}

.pillar-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.pillar-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ---------- Social proof ---------- */
.social-proof {
  text-align: center;
  border-top: 1px solid var(--border);
}

.social-proof .pillars-grid {
  margin-bottom: 2rem;
}

.social-proof .cta-banner {
  margin-top: 2rem;
}

.proof-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.logos-row {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.logo-placeholder {
  width: 110px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
}
.cta-banner h2 {
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.cta-banner p {
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

/* ---------- Offres ---------- */
.offers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.offer-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
}
.offer-card.highlight {
  border-color: var(--accent);
}

.offer-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--accent);
  color: #fff;
  border-radius: 3px;
  padding: 2px 8px;
  margin-bottom: 1rem;
}

.offer-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.offer-price {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent2);
  margin-bottom: 1rem;
}
.offer-price span {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
}

.offer-features {
  list-style: none;
  margin-bottom: 1.5rem;
}
.offer-features li {
  padding: 0.4rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.offer-features li::before {
  content: "→ ";
  color: var(--accent);
}

/* Subscription tiers */
.sub-tiers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.sub-tier {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  text-align: center;
}
.sub-tier .tier-name {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}
.sub-tier .tier-price {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent2);
}

/* Model options */
.model-section { margin-top: 3rem; }
.model-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.model-card.recommended { border-color: var(--accent); }
.model-card h4 { font-weight: 700; margin-bottom: 0.4rem; }
.model-card p { font-size: 0.88rem; color: var(--text-muted); }

.recommended-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--accent);
  color: #fff;
  border-radius: 3px;
  padding: 2px 6px;
  margin-bottom: 0.5rem;
}

.model-note {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(192,57,43,0.08);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Cas d'usage ---------- */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.usecase-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s;
}
.usecase-card:hover { border-color: var(--accent); }

.usecase-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.usecase-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.usecase-card .pitch {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.keywords {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.keyword {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 8px;
  color: var(--text-muted);
}

/* ---------- À propos ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 700px) {
  .about-grid { grid-template-columns: 1fr; }
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.75;
}
.about-text p:last-child { margin-bottom: 0; }

.about-values {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.about-values h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--accent2);
}
.about-values ul {
  list-style: none;
}
.about-values li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--text-muted);
}
.about-values li::before { content: "▸ "; color: var(--accent); }
.about-values li:last-child { border-bottom: none; }

.entity-block {
  margin-top: 3rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-muted);
}
.entity-block strong { color: var(--text); }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
@media (max-width: 700px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.form-group input,
.form-group textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  transition: border-color 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}
.form-group textarea { resize: vertical; min-height: 130px; }

.form-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.contact-info {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}
.contact-info h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}
.contact-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.contact-info a {
  color: var(--accent2);
  font-weight: 600;
}

/* ---------- Footer ---------- */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-weight: 800;
  color: var(--text);
  font-size: 0.95rem;
}
.footer-logo span { color: var(--accent); }

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.82rem;
}
.footer-links a:hover { color: var(--text); }

/* ---------- Page header (inner pages) ---------- */
.page-header {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--border);
}
.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}
.page-header p {
  color: var(--text-muted);
  max-width: 540px;
}

/* ---------- Divider ---------- */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }

  .hero { padding: 4rem 0 3.5rem; }

  .sub-tiers { grid-template-columns: 1fr; }

  .footer-inner { flex-direction: column; align-items: flex-start; }
}