/* ClimbingFish — shared foundation (tokens, chrome, components).
   Used by module pages; the home will be migrated onto this file in a later step. */

:root {
  --electric-blue: #0099ff;
  --light-blue: #00d4ff;
  --dark-blue: #0066cc;
  --night-blue: #1b2a41;
  --night-deep: #0d1a2d;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gradient-brand: linear-gradient(135deg, var(--light-blue) 0%, var(--electric-blue) 50%, var(--dark-blue) 100%);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-blue: 0 4px 20px rgba(0, 153, 255, 0.25);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 150px; }
body {
  font-family: 'Montserrat', -apple-system, 'Segoe UI', sans-serif;
  background-color: var(--white);
  color: var(--night-blue);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Language toggle system */
[data-lang="en"] { display: none; }
[data-lang="fr"] { display: block; }
body.lang-en [data-lang="en"] { display: block; }
body.lang-en [data-lang="fr"] { display: none; }
span[data-lang="en"], a[data-lang="en"], button[data-lang="en"] { display: none; }
span[data-lang="fr"], a[data-lang="fr"], button[data-lang="fr"] { display: inline-flex; }
body.lang-en span[data-lang="en"], body.lang-en a[data-lang="en"], body.lang-en button[data-lang="en"] { display: inline-flex; }
body.lang-en span[data-lang="fr"], body.lang-en a[data-lang="fr"], body.lang-en button[data-lang="fr"] { display: none; }

/* Background wash */
.bg-pattern {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 153, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(0, 212, 255, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse 50% 30% at 0% 80%, rgba(0, 102, 204, 0.05) 0%, transparent 50%);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; position: relative; z-index: 2; }

/* Header */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1.25rem 0; background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px); border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}
nav { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
nav > a:first-child { flex-shrink: 0; }
.logo { height: 96px; transition: var(--transition); flex-shrink: 0; }
.logo:hover { transform: scale(1.02); }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { text-decoration: none; color: var(--gray-600); font-weight: 500; font-size: 0.9rem; letter-spacing: 0.02em; transition: var(--transition); position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--gradient-brand); transition: var(--transition); }
.nav-links a:hover { color: var(--night-blue); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.btn-primary { color: var(--white); }

/* Language switcher */
.lang-switcher { display: flex; align-items: center; gap: 0.25rem; background: var(--gray-100); border-radius: 6px; padding: 0.25rem; margin-left: 0.5rem; }
.lang-btn { padding: 0.4rem 0.75rem; border: none; background: transparent; color: var(--gray-500); font-family: 'Montserrat', sans-serif; font-size: 0.8rem; font-weight: 600; cursor: pointer; border-radius: 4px; transition: var(--transition); }
.lang-btn:hover { color: var(--night-blue); }
.lang-btn.active { background: var(--white); color: var(--electric-blue); box-shadow: var(--shadow-sm); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.875rem 1.75rem; border-radius: 8px; font-weight: 600; font-size: 0.9rem; text-decoration: none; transition: var(--transition); cursor: pointer; border: none; letter-spacing: 0.02em; }
.btn-primary { background: var(--gradient-brand); color: var(--white); box-shadow: var(--shadow-blue); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0, 153, 255, 0.35); }
.btn-secondary { background: transparent; color: var(--electric-blue); border: 1px solid var(--electric-blue); }
.btn-secondary:hover { background: rgba(0, 153, 255, 0.08); }

/* Section utilities */
.section { padding: 6rem 0; }
.section-alt { background: var(--gray-50); }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-label { display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--electric-blue); margin-bottom: 1rem; }
.section-title { font-size: clamp(1.75rem, 3.5vw, 2.5rem); font-weight: 700; margin-bottom: 1rem; color: var(--night-blue); }
.section-subtitle { color: var(--gray-600); font-size: 1.1rem; max-width: 700px; margin: 0 auto; line-height: 1.8; }

/* Footer */
footer { padding: 4rem 0 2rem; border-top: 1px solid var(--gray-200); background: var(--white); }
.footer-content { display: flex; justify-content: space-between; align-items: flex-start; gap: 3rem; flex-wrap: wrap; }
.footer-brand { max-width: 300px; }
.footer-logo { height: 36px; margin: 0 auto 1rem; display: block; }
.footer-brand p { color: var(--gray-500); font-size: 0.9rem; line-height: 1.7; text-align: center; margin: 0 auto; }
.footer-links { display: flex; gap: 4rem; }
.footer-column h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 1rem; color: var(--night-blue); }
.footer-column ul { list-style: none; }
.footer-column li { margin-bottom: 0.5rem; }
.footer-column a { color: var(--gray-500); text-decoration: none; font-size: 0.875rem; transition: var(--transition); }
.footer-column a:hover { color: var(--electric-blue); }
.footer-bottom { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--gray-200); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-bottom p { color: var(--gray-500); font-size: 0.8rem; }
.footer-legal { display: flex; gap: 2rem; }
.footer-legal a { color: var(--gray-500); text-decoration: none; font-size: 0.8rem; transition: var(--transition); }
.footer-legal a:hover { color: var(--electric-blue); }

/* Mobile menu */
.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.mobile-menu-btn span { display: block; width: 24px; height: 2px; background: var(--night-blue); margin: 5px 0; transition: var(--transition); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.active { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: rgba(255, 255, 255, 0.98); padding: 1.5rem 2rem; border-bottom: 1px solid var(--gray-200); gap: 1rem; }
  .mobile-menu-btn { display: block; }
  .mobile-menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
  .mobile-menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
  header .container { padding: 0 1rem; }
  .logo { height: 40px; }
  .lang-switcher { margin-left: auto; margin-right: 0.25rem; padding: 0.15rem; flex-shrink: 0; }
  .lang-btn { padding: 0.25rem 0.45rem; font-size: 0.65rem; }
  .footer-content { flex-direction: column; }
  .footer-links { flex-direction: column; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-legal { justify-content: center; }
}

/* Nav dropdown (Cas d'usage) + FAQ */
.nav-dd { position: relative; display: inline-flex; align-items: center; gap: 0.25rem; }
.nav-dd::before { content: ''; position: absolute; top: 100%; left: -0.6rem; right: -0.6rem; height: 14px; }
.nav-dd-caret { font-size: 0.58rem; color: var(--gray-500); transition: transform 0.2s ease; pointer-events: none; }
.nav-dd:hover .nav-dd-caret, .nav-dd:focus-within .nav-dd-caret { transform: rotate(180deg); color: var(--electric-blue); }
.nav-dd-menu { position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(6px); min-width: 210px; background: var(--white); border: 1px solid var(--gray-200); border-radius: 12px; box-shadow: var(--shadow-lg); padding: 0.4rem; display: flex; flex-direction: column; opacity: 0; visibility: hidden; transition: opacity 0.2s ease, transform 0.2s ease; z-index: 200; }
.nav-dd:hover .nav-dd-menu, .nav-dd:focus-within .nav-dd-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.nav-dd-menu a { padding: 0.5rem 0.8rem; border-radius: 8px; font-size: 0.86rem; color: var(--gray-600); white-space: nowrap; }
.nav-dd-menu a::after { display: none !important; }
.nav-dd-menu a:hover { color: var(--night-blue); background: var(--gray-50); }
@media (max-width: 768px) {
  .nav-dd { flex-direction: column; align-items: flex-start; gap: 0.35rem; width: 100%; }
  .nav-dd::before { display: none; }
  .nav-dd-caret { display: none; }
  .nav-dd-menu { position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none; border: none; background: transparent; padding: 0 0 0 1rem; min-width: 0; gap: 0.1rem; }
}