/* ============================================================
   SPHERIT — Design System
   Style : Stripe / Linear / Vercel — fond blanc, typo forte
   ============================================================ */

:root{
  --red:#E30613;
  --red-dark:#B8050F;
  --blue:#4FB3DE;
  --blue-dark:#2E86AB;
  --ink:#101828;
  --gray:#475467;
  --gray-light:#98A2B3;
  --line:#EAECF0;
  --soft:#F8FAFC;
  --soft-blue:#F0F8FC;
  --soft-red:#FEF3F2;
  --radius:16px;
  --shadow:0 1px 2px rgba(16,24,40,.05);
  --shadow-lg:0 12px 32px -8px rgba(16,24,40,.12);
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--blue);color:#fff}

.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- Typographie ---------- */
h1{font-size:clamp(2.4rem,5.5vw,4rem);font-weight:800;letter-spacing:-.03em;line-height:1.08}
h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;letter-spacing:-.025em;line-height:1.15}
h3{font-size:1.25rem;font-weight:700;letter-spacing:-.01em}
.lead{font-size:1.2rem;color:var(--gray);max-width:640px}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:var(--red);margin-bottom:14px}
.eyebrow.blue{color:var(--blue-dark)}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}

/* ---------- Boutons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:12px;font-weight:600;font-size:1rem;transition:all .2s ease;border:1.5px solid transparent;cursor:pointer}
.btn-red{background:var(--red);color:#fff;box-shadow:0 4px 14px rgba(227,6,19,.25)}
.btn-red:hover{background:var(--red-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(227,6,19,.35)}
.btn-outline{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-outline:hover{border-color:var(--ink);transform:translateY(-1px)}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(0,0,0,.2)}
.btn-lg{padding:17px 34px;font-size:1.05rem}

/* ---------- Header ---------- */
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.nav-logo img{height:44px;width:auto}
.nav-links{display:flex;align-items:center;gap:32px;list-style:none}
.nav-links a{font-size:.95rem;font-weight:500;color:var(--gray);transition:color .15s}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-cta .btn{padding:10px 20px;font-size:.9rem}
.burger{display:none;background:none;border:none;cursor:pointer;padding:8px}
.burger span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;border-radius:2px;transition:.25s}
#nav-toggle{display:none}

/* ---------- Hero ---------- */
.hero{padding:96px 0 72px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:64px;align-items:center}
.hero .lead{margin:24px 0 36px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-note{margin-top:20px;font-size:.88rem;color:var(--gray-light)}
.hero-bg{position:absolute;inset:0;z-index:-1;background:
  radial-gradient(ellipse 60% 50% at 85% 10%,rgba(79,179,222,.12),transparent),
  radial-gradient(ellipse 40% 40% at 10% 90%,rgba(227,6,19,.05),transparent)}

/* ---------- Bande chiffres ---------- */
.stats-band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--soft)}
.stats{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding:28px 0}
.stat{text-align:center;flex:1;min-width:120px}
.stat b{display:block;font-size:1.15rem;font-weight:800;letter-spacing:-.01em}
.stat span{font-size:.82rem;color:var(--gray)}

/* ---------- Sections ---------- */
section{padding:96px 0}
section.tight{padding:72px 0}
section.soft{background:var(--soft)}
.section-head{margin-bottom:56px}

/* ---------- Le Rail ---------- */
.rail-wrap{position:relative;max-width:760px;margin:64px auto 0}
.rail-track{position:absolute;left:50%;top:0;bottom:0;width:3px;transform:translateX(-50%);background:linear-gradient(180deg,var(--red),var(--blue));border-radius:3px;opacity:.25}
.rail-dot{position:absolute;left:50%;top:0;width:15px;height:15px;transform:translateX(-50%);border-radius:50%;background:var(--red);box-shadow:0 0 0 6px rgba(227,6,19,.15);animation:railride 6s ease-in-out infinite}
@keyframes railride{
  0%,8%{top:6%;background:var(--red);box-shadow:0 0 0 6px rgba(227,6,19,.15)}
  40%,55%{top:50%;background:var(--blue);box-shadow:0 0 0 6px rgba(79,179,222,.2)}
  90%,100%{top:94%;background:var(--red);box-shadow:0 0 0 6px rgba(227,6,19,.15)}
}
.rail-step{position:relative;width:calc(50% - 40px);background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);margin-bottom:48px;transition:transform .2s,box-shadow .2s}
.rail-step:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.rail-step:nth-child(odd of .rail-step){margin-right:auto}
.rail-step:nth-child(even of .rail-step){margin-left:auto}
.rail-step .tag{display:inline-block;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;padding:4px 10px;border-radius:100px;margin-bottom:12px}
.tag-mission{background:var(--soft-red);color:var(--red)}
.tag-inter{background:var(--soft-blue);color:var(--blue-dark)}
.rail-step p{color:var(--gray);font-size:.95rem;margin-top:8px}

/* ---------- Grilles de cartes ---------- */
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.cards-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px 32px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card .icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin-bottom:20px}
.icon-red{background:var(--soft-red)}
.icon-blue{background:var(--soft-blue)}
.card h3{margin-bottom:10px}
.card p{color:var(--gray);font-size:.97rem}
.card .card-link{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-weight:600;color:var(--red);font-size:.93rem}
.card .card-link:hover{gap:10px}
.card-top{position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--red),var(--blue))}

/* ---------- Pourquoi Spherit (6 cartes) ---------- */
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.why{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.why .check{color:var(--red);font-weight:800;font-size:1.1rem}
.why h3{font-size:1.05rem;margin:10px 0 6px}
.why p{color:var(--gray);font-size:.92rem}

/* ---------- Split (entreprises / consultants) ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.panel{border-radius:20px;padding:48px 40px;position:relative;overflow:hidden}
.panel-dark{background:var(--ink);color:#fff}
.panel-dark p{color:rgba(255,255,255,.75)}
.panel-light{background:var(--soft-blue)}
.panel-light p{color:var(--gray)}
.panel h2{font-size:1.7rem;margin-bottom:14px}
.panel .btn{margin-top:26px}
.panel ul{list-style:none;margin-top:18px}
.panel li{padding:7px 0;font-size:.96rem;display:flex;gap:10px}
.panel li::before{content:"✓";color:var(--blue);font-weight:800}
.panel-dark li::before{color:var(--blue)}

/* ---------- Pricing / offres ---------- */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.price-card{background:#fff;border:1.5px solid var(--line);border-radius:20px;padding:40px 32px;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.price-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.price-card.featured{border-color:var(--red);box-shadow:0 12px 40px -8px rgba(227,6,19,.18)}
.price-card .badge{align-self:flex-start;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;background:var(--red);color:#fff;padding:5px 12px;border-radius:100px;margin-bottom:16px}
.price-card .rate{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;margin:8px 0 2px}
.price-card .rate small{font-size:1rem;font-weight:600;color:var(--gray)}
.price-card .sub{color:var(--gray-light);font-size:.88rem;margin-bottom:22px}
.price-card ul{list-style:none;margin-bottom:28px;flex:1}
.price-card li{padding:8px 0;font-size:.94rem;color:var(--gray);display:flex;gap:10px;border-bottom:1px solid var(--soft)}
.price-card li::before{content:"✓";color:var(--red);font-weight:800;flex-shrink:0}
.price-card .btn{width:100%;justify-content:center}

/* ---------- Steps numérotés ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step{position:relative;padding:28px 24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-size:.85rem;font-weight:800;color:var(--red);letter-spacing:.05em}
.step h3{font-size:1.02rem;margin:10px 0 6px}
.step p{color:var(--gray);font-size:.9rem}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;font-weight:600;padding:18px 0;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--gray-light);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{color:var(--gray);padding-bottom:18px;font-size:.96rem}

/* ---------- CTA final ---------- */
.cta-band{background:linear-gradient(120deg,var(--ink) 0%,#1a2540 60%,#1e3a5f 100%);border-radius:24px;padding:72px 48px;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 50% 60% at 80% 20%,rgba(79,179,222,.25),transparent),radial-gradient(ellipse 40% 50% at 15% 85%,rgba(227,6,19,.18),transparent)}
.cta-band>*{position:relative}
.cta-band h2{color:#fff;margin-bottom:14px}
.cta-band p{color:rgba(255,255,255,.75);max-width:560px;margin:0 auto 32px}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--line);padding:64px 0 32px;background:var(--soft)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px}
.footer-grid img{height:40px;margin-bottom:16px}
.footer-grid p{color:var(--gray);font-size:.9rem;max-width:280px}
.footer-grid h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.1em;color:var(--gray-light);margin-bottom:16px}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:10px}
.footer-grid li a{color:var(--gray);font-size:.93rem}
.footer-grid li a:hover{color:var(--ink)}
.footer-bottom{border-top:1px solid var(--line);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.85rem;color:var(--gray-light)}

/* ---------- Animations d'apparition ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* ---------- Page hero (pages intérieures) ---------- */
.page-hero{padding:80px 0 56px;background:linear-gradient(180deg,var(--soft) 0%,#fff 100%)}
.page-hero .lead{margin-top:18px}

/* ---------- Tableau ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:.95rem;background:#fff}
th{text-align:left;padding:16px 20px;background:var(--soft);font-weight:700;font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;color:var(--gray)}
td{padding:16px 20px;border-top:1px solid var(--line);color:var(--gray)}
td b{color:var(--ink)}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .cards-3,.why-grid,.pricing{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  section{padding:64px 0}
  .hero{padding:56px 0 48px}
  .cards-3,.cards-2,.why-grid,.pricing,.split,.steps{grid-template-columns:1fr}
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:24px;gap:20px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-lg)}
  #nav-toggle:checked ~ .nav-links{display:flex}
  .burger{display:block}
  .nav-cta .btn-outline{display:none}
  .rail-step{width:calc(100% - 40px);margin-left:40px !important}
  .rail-track,.rail-dot{left:10px;transform:none}
  .cta-band{padding:56px 24px}
}