/* ═══════════════════════════════════════════════════════════
   CONTINUUM BIM — COMMON STYLESHEET
   Variables, reset, header, footer, buttons, nav, FAQ,
   services-nav, CTA, lang-switcher, animations, utilities
   ═══════════════════════════════════════════════════════════ */

/* ═══ CSS VARIABLES ═══ */
:root {
  --primary: #0F172A; --primary-light: #1E293B;
  --accent: #0369A1; --accent-light: #0EA5E9; --accent-vivid: #0284C7; --accent-subtle: #E0F2FE;
  --orange: #F97316; --emerald: #10B981;
  --bg: #F8FAFC; --bg-white: #FFFFFF;
  --text: #020617; --text-secondary: #475569; --text-muted: #64748B; --border: #E2E8F0;
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.05); --shadow-md: 0 4px 16px rgba(15,23,42,0.08);
  --shadow-lg: 0 8px 32px rgba(15,23,42,0.12); --shadow-accent: 0 4px 20px rgba(3,105,161,0.15);
  --font-heading: 'Plus Jakarta Sans','Space Grotesk',sans-serif;
  --font-body: 'DM Sans',sans-serif; --font-display: 'Space Grotesk',sans-serif;
  --max-width: 1200px; --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --success: #10B981; --radius: 0px; --radius-lg: 0px;
}

/* ═══ RESET & BASE ═══ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-body);color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:inherit}img{max-width:100%;height:auto;display:block}ul{list-style:none}
h1,h2,h3,h4,h5{font-family:var(--font-heading);line-height:1.15;font-weight:800}
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
.section{padding:100px 0}

/* ═══ SECTION LABELS ═══ */
.section-label{font-family:var(--font-display);font-size:13px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;color:var(--accent-vivid);margin-bottom:16px;display:inline-flex;align-items:center;gap:10px}
.section-label::before{content:'';width:28px;height:3px;background:linear-gradient(90deg,#0EA5E9,#06b6d4)}

/* ═══ BUTTONS ═══ */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:0;font-family:var(--font-heading);font-weight:600;font-size:15px;cursor:pointer;border:none;transition:var(--transition)}
.btn-primary{background:var(--accent-vivid);color:#fff;box-shadow:0 2px 12px rgba(2,132,199,0.25)}
.btn-primary:hover{background:#0369A1;transform:translateY(-2px)}
.btn-outline{background:transparent;color:var(--accent-vivid);border:2px solid var(--accent-vivid)}
.btn-outline:hover{background:var(--accent-vivid);color:#fff;transform:translateY(-2px)}

/* ═══ HEADER ═══ */
.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,0.95);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.header::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-vivid),var(--accent-light),#06b6d4,var(--emerald))}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:76px}
.logo{display:flex;align-items:center}.logo-img{height:52px;width:auto}
.nav-links{display:flex;gap:0;align-items:center;margin-left:auto;margin-right:32px}
.nav-item{position:relative;padding:0 16px}
.nav-item>a{font-size:15px;font-weight:600;color:var(--text-secondary);transition:var(--transition);display:flex;align-items:center;gap:4px;padding:24px 0}
.nav-item>a:hover,.nav-item.active>a{color:var(--accent-vivid)}
.nav-item>a .chevron{width:12px;height:12px;transition:var(--transition)}
.nav-item:hover>a .chevron{transform:rotate(180deg)}
.dropdown{position:absolute;top:100%;left:0;background:var(--bg-white);border:1px solid var(--border);padding:8px 0;min-width:260px;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(8px);transition:var(--transition)}
.nav-item:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:10px 20px;font-size:14px;font-weight:600;color:var(--text);transition:var(--transition)}
.dropdown a:hover,.dropdown a.active-sub{background:var(--accent-subtle);color:var(--accent-vivid)}
.nav-cta{display:flex;align-items:center}
.mobile-toggle{display:none;background:none;border:none;cursor:pointer;width:32px;height:24px;flex-direction:column;justify-content:space-between}
.mobile-toggle span{display:block;width:100%;height:2.5px;background:var(--primary);transition:var(--transition)}

/* ═══ LANG SWITCHER ═══ */
.lang-switcher{position:relative;margin-left:16px;z-index:101}
.lang-btn{display:flex;align-items:center;gap:6px;padding:7px 12px;background:transparent;border:1px solid var(--border);cursor:pointer;transition:var(--transition);font-family:var(--font-heading);font-size:12px;font-weight:700;color:var(--text-secondary);letter-spacing:0.5px;text-transform:uppercase}
.lang-btn:hover{border-color:var(--accent-vivid);color:var(--accent-vivid)}
.lang-btn svg{width:16px;height:16px;opacity:0.6}
.lang-btn .chevron-sm{width:10px;height:10px;transition:var(--transition)}
.lang-switcher:hover .lang-btn .chevron-sm{transform:rotate(180deg)}
.lang-dropdown{position:absolute;top:calc(100% + 6px);right:0;background:var(--bg-white);border:1px solid var(--border);box-shadow:var(--shadow-lg);min-width:160px;opacity:0;visibility:hidden;transform:translateY(6px);transition:var(--transition);z-index:102}
.lang-switcher:hover .lang-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.lang-dropdown a{display:flex;align-items:center;gap:10px;padding:10px 16px;font-family:var(--font-heading);font-size:13px;font-weight:600;color:var(--text-secondary);transition:var(--transition)}
.lang-dropdown a:hover{background:var(--accent-subtle);color:var(--accent-vivid)}
.lang-dropdown a.lang-active{color:var(--accent-vivid);background:var(--accent-subtle);pointer-events:none}
.lang-dropdown a.lang-active::after{content:'✓';margin-left:auto;font-size:12px}
.lang-flag{font-size:16px;line-height:1}

/* ═══ CTA SECTION ═══ */
.cta-section{padding:100px 0;background:var(--bg)}
.cta-inner{background:url('../img/2022_11_Contactez-nous.png') center/cover no-repeat;padding:72px 56px;position:relative;overflow:hidden;min-height:320px;display:flex;flex-direction:column;justify-content:space-between}
.cta-inner::before{content:'';position:absolute;inset:0;background:rgba(2,6,23,0.55)}
.cta-text{position:relative;z-index:1;max-width:520px}
.cta-inner h2{font-size:clamp(28px,3.5vw,40px);color:#fff;margin-bottom:12px}
.cta-inner p{font-size:16px;color:rgba(255,255,255,0.8);line-height:1.7}
.cta-btn-wrap{position:relative;z-index:1;margin-top:24px}

/* ═══ SERVICES NAV ═══ */
.services-nav{padding:80px 0;background:var(--bg);border-top:1px solid var(--border)}
.services-nav-title{font-family:var(--font-display);font-size:13px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;color:var(--accent-vivid);margin-bottom:32px;display:inline-flex;align-items:center;gap:10px}
.services-nav-title::before{content:'';width:28px;height:3px;background:linear-gradient(90deg,#0EA5E9,#06b6d4)}
.services-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.service-link{display:flex;align-items:center;gap:16px;padding:24px;background:var(--bg-white);border:1px solid var(--border);transition:var(--transition);position:relative;overflow:hidden}
.service-link::after{content:'→';position:absolute;right:24px;font-size:18px;color:var(--accent-vivid);opacity:0;transform:translateX(-8px);transition:var(--transition)}
.service-link:hover{border-color:var(--accent-vivid);transform:translateY(-3px);box-shadow:var(--shadow-md)}
.service-link:hover::after{opacity:1;transform:translateX(0)}
.service-link.current{border-color:var(--accent-vivid);background:var(--accent-subtle)}
.service-link-icon{width:44px;height:44px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:var(--accent-subtle);color:var(--accent-vivid)}
.service-link.current .service-link-icon{background:var(--accent-vivid);color:#fff}
.service-link span{font-family:var(--font-heading);font-size:14px;font-weight:700;color:var(--primary)}

/* ═══ FAQ SECTION ═══ */
.faq-section{padding:80px 0 60px;background:var(--bg);border-top:1px solid var(--border)}
.faq-section .container{max-width:800px}
.faq-title{font-size:22px;font-weight:700;color:var(--primary);margin-bottom:32px;font-family:var(--font-heading)}
.faq-item{border-bottom:1px solid var(--border)}
.faq-question{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:20px 0;background:none;border:none;cursor:pointer;font-family:var(--font-heading);font-size:15px;font-weight:600;color:var(--text);text-align:left;transition:color 0.2s}
.faq-question:hover{color:var(--accent-vivid)}
.faq-question .faq-icon{width:20px;height:20px;flex-shrink:0;transition:transform 0.3s;stroke:var(--text-muted);stroke-width:2;fill:none}
.faq-item.open .faq-question .faq-icon{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease,padding 0.35s ease}
.faq-answer-inner{padding:0 0 20px;font-size:14px;color:var(--text-secondary);line-height:1.7}

/* ═══ SEO CONTENT SECTIONS ═══ */
.seo-content-section{padding:40px 0;border-bottom:1px solid var(--border)}
.seo-content-section h2{font-size:22px;font-weight:700;color:var(--primary);margin-bottom:16px}
.seo-content-section p{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:12px}
.see-also{padding:20px;margin:24px 0;background:var(--accent-subtle);border-left:3px solid var(--accent-vivid);font-size:14px;color:var(--text-secondary);line-height:1.7}
.see-also a{color:var(--accent-vivid);font-weight:600;text-decoration:none;transition:var(--transition)}
.see-also a:hover{text-decoration:underline}

/* ═══ BLUE SHADES ═══ */
.hl-bim{background:linear-gradient(135deg,#38bdf8,#0EA5E9);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hl-teal{background:linear-gradient(135deg,#06b6d4,#2dd4bf);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hl-sky{color:#38bdf8}
.hl-cyan{color:#06b6d4}

/* ═══ FOOTER ═══ */
.footer{background:var(--primary);color:rgba(255,255,255,0.7);padding:80px 0 0;border-top:1px solid rgba(255,255,255,0.08)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,0.08)}
.footer-brand p{font-size:14px;margin-top:20px;line-height:1.7;color:rgba(255,255,255,0.5)}
.footer-socials{display:flex;gap:10px;margin-top:20px}
.footer-social{width:38px;height:38px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,0.08);color:rgba(255,255,255,0.6);font-size:14px;font-weight:700;transition:var(--transition)}
.footer-social:hover{background:var(--accent-vivid);color:#fff}
.footer h4{font-size:14px;font-weight:700;color:#fff;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:20px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:rgba(255,255,255,0.5);transition:var(--transition)}
.footer-links a:hover{color:var(--accent-light);transform:translateX(4px)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:24px 0;font-size:13px;color:rgba(255,255,255,0.35)}

/* ═══ BACK TO TOP ═══ */
.back-to-top{position:fixed;bottom:28px;right:28px;z-index:90;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--accent-vivid);color:#fff;border:none;cursor:pointer;box-shadow:var(--shadow-accent);opacity:0;transform:translateY(20px);transition:var(--transition)}
.back-to-top.visible{opacity:1;transform:translateY(0)}.back-to-top:hover{background:#0369A1;transform:translateY(-3px)}
.back-to-top svg{width:20px;height:20px}

/* ═══ ANIMATIONS ═══ */
.fade-up{opacity:0;transform:translateY(30px);transition:opacity 0.7s ease,transform 0.7s cubic-bezier(0.25,0.46,0.45,0.94)}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ═══ COMMON RESPONSIVE ═══ */
@media(max-width:1024px){
  .nav-links,.nav-cta{display:none}.mobile-toggle{display:flex}
  .services-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .services-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
}