/* ===========================
   Design System & Variables
   =========================== */
:root{
  --bg:#ffffff;
  --text:#0f172a;        /* slate-900 */
  --muted:#475569;       /* slate-600 */
  --line:#e2e8f0;        /* slate-200 */
  --primary:#2563eb;     /* blue-600 */
  --primary-600:#1d4ed8; /* blue-700 */
  --accent:#10b981;      /* emerald-500 */
  --card:#f8fafc;        /* slate-50 */
  --shadow:0 10px 30px rgba(2,6,23,.08);
  --shadow-lg:0 18px 45px rgba(2,6,23,.12);
  --radius:16px;
  --radius-sm:12px;
  --container:1200px;
  --header-h:68px;
}

/* ===========================
   Base & Layout
   =========================== */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:20px;
}

/* ===========================
   Header & Navigation
   =========================== */
header.site-header{
  position:sticky; top:0; z-index:50;
  backdrop-filter:saturate(1.4) blur(6px);
  background:rgba(255,255,255,.85);
  border-bottom:1px solid var(--line);
}
.header-inner{
  height:var(--header-h);
  display:flex; align-items:center; justify-content:space-between;
  gap:16px;
}
.logo{display:flex; align-items:center; gap:10px; text-decoration:none; color:inherit}
.logo img{height:36px; width:auto; display:block}
.logo .brand{font-weight:700; font-size:1.05rem; letter-spacing:.2px}

nav.primary-nav{display:flex; align-items:center; gap:18px}
.nav-link{
  text-decoration:none; color:var(--text); font-weight:600; font-size:.98rem;
  padding:8px 12px; border-radius:10px;
}
.nav-link:hover{background:var(--card)}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  padding:12px 18px; border-radius:999px; font-weight:700; text-decoration:none;
  background:var(--primary); color:#fff; box-shadow:var(--shadow);
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  cursor:pointer; border:none;
}
.btn:hover{transform:translateY(-1px); background:var(--primary-600)}
.btn:active{transform:translateY(0)}
.btn-secondary{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:10px 14px; border-radius:999px; font-weight:700;
  background:#fff; color:var(--text); border:1px solid var(--line);
  transition:background .15s ease, transform .15s ease;
  cursor:pointer; text-decoration:none;
}
.btn-secondary:hover{background:var(--card)}

/* Burger */
.burger{
  display:none; position:relative; width:40px; height:40px;
  border:1px solid var(--line); border-radius:12px; background:#fff;
  align-items:center; justify-content:center; cursor:pointer;
  transition:background .2s ease, border-color .2s ease;
}
.burger:hover{background:var(--card)}
.burger .bar,
.burger .bar::before,
.burger .bar::after{
  content:"";
  position:relative;
  display:block; width:20px; height:2px; background:var(--text);
  transition:transform .25s ease, opacity .2s ease;
}
.burger .bar::before, .burger .bar::after{position:absolute; left:0}
.burger .bar::before{transform:translateY(-6px)}
.burger .bar::after{transform:translateY(6px)}
.burger[aria-expanded="true"] .bar{background:transparent}
.burger[aria-expanded="true"] .bar::before{transform:rotate(45deg)}
.burger[aria-expanded="true"] .bar::after{transform:rotate(-45deg)}

/* Mobile panel */
.mobile-panel{
  position:fixed; inset:var(--header-h) 0 auto 0; z-index:40;
  transform:translateY(-10px); opacity:0; pointer-events:none;
  transition:opacity .2s ease, transform .25s ease;
  background:#fff; border-bottom:1px solid var(--line);
}
.mobile-panel.open{transform:translateY(0); opacity:1; pointer-events:auto}
.mobile-panel .panel-inner{
  padding:12px 20px; display:flex; gap:8px; flex-direction:column;
}
.mobile-panel .nav-link{padding:12px 14px; border:1px solid var(--line); border-radius:12px}

/* ===========================
   Hero / Banner / Meta
   =========================== */
.hero{background:linear-gradient(180deg, #ffffff, #f8fafc); border-bottom:1px solid var(--line)}
.hero .hero-inner{display:grid; gap:22px; padding:28px 0 26px}
.banner{
  position:relative; border-radius:var(--radius);
  overflow:hidden; box-shadow:var(--shadow);
  aspect-ratio:16 / 6; background:#eef2ff;
}
.banner img{width:100%; height:100%; object-fit:cover; display:block}
.hero-cta{display:flex; justify-content:center; padding-bottom:8px}
.meta-row{display:flex; align-items:center; gap:10px; color:var(--muted); font-size:.92rem; margin-top:6px}

/* ===========================
   Sections & Typography
   =========================== */
main{scroll-behavior:smooth}
section{padding:40px 0; border-bottom:1px solid var(--line)}
h1{font-size:clamp(1.6rem, 1.2rem + 1.2vw, 2.2rem); margin:0 0 8px 0; letter-spacing:.2px}
h2{font-size:clamp(1.25rem, 1rem + .8vw, 1.6rem); margin:0 0 12px 0}
p{margin:0 0 12px 0; color:var(--text)}
.lead{font-size:1.05rem; color:var(--muted)}

/* Cards */
.card{
  background:#fff; border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; box-shadow:var(--shadow);
}

/* Grids */
.section-grid{display:grid; gap:18px; grid-template-columns:1fr}
@media (min-width: 720px){ .section-grid{grid-template-columns:repeat(2,1fr)} }

/* Interstitial media (between sections) */
.slice-media{
  position:relative; border-radius:var(--radius); overflow:hidden;
  box-shadow:var(--shadow); background:#eef2ff; aspect-ratio:16/9;
}
.slice-media img{width:100%; height:100%; object-fit:cover; display:block}

/* Centered row (CTAs) */
.center-row{display:flex; justify-content:center; margin-top:10px}

/* ===========================
   Table of Contents (Sommaire)
   =========================== */
.toc{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  overflow:hidden; box-shadow:var(--shadow);
}
.toc-toggle{
  width:100%; background:#fff; border:none; text-align:left; padding:16px 18px;
  font-weight:700; font-size:1rem; cursor:pointer;
  display:flex; align-items:center; justify-content:space-between;
}
.toc-panel{
  display:grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr));
  gap:10px; padding:14px 18px; border-top:1px solid var(--line);
  max-height:0; overflow:hidden; transition:max-height .35s ease;
}
.toc.open .toc-panel{max-height:340px}
.toc a{ text-decoration:none; color:var(--text); padding:10px 12px; border-radius:10px }
.toc a:hover{background:#fff}

/* ===========================
   Author block
   =========================== */
.author{
  display:grid; grid-template-columns:96px 1fr; gap:16px;
  background:#fff; border:1px solid var(--line); border-radius:var(--radius);
  padding:18px; align-items:center; box-shadow:var(--shadow);
}
.author img{
  width:96px; height:96px; border-radius:50%; object-fit:cover; border:1px solid var(--line);
}

/* ===========================
   Forms (Contact page)
   =========================== */
.form-card{position:relative}
.form-grid{display:grid; gap:14px; grid-template-columns:1fr}
.form-row{display:grid; gap:12px; grid-template-columns:1fr 1fr}
.form-row > *{min-width:0}

label{font-weight:700; font-size:.95rem}
.field{
  appearance:none; width:100%;
  border:1px solid var(--line); background:#fff; color:var(--text);
  border-radius:12px; padding:12px 14px; font-size:1rem;
  transition:border-color .15s ease, box-shadow .15s ease;
}
.field::placeholder{color:#94a3b8}
.field:focus{outline:none; border-color:#cbd5e1; box-shadow:0 0 0 4px rgba(37,99,235,.08)}
textarea.field{min-height:140px; resize:vertical}

.help{color:var(--muted); font-size:.9rem}
.error{color:#b91c1c; font-size:.9rem; display:none}
.has-error .error{display:block}
.has-error .field{border-color:#fecaca; box-shadow:0 0 0 4px rgba(239,68,68,.08)}

.actions{display:flex; align-items:center; gap:12px; margin-top:6px}
.spinner{
  width:16px; height:16px; border-radius:50%;
  border:2px solid rgba(255,255,255,.7); border-top-color:transparent;
  animation:spin 1s linear infinite; display:inline-block;
}
@keyframes spin{to{transform:rotate(360deg)}}

.sending-overlay{
  position:absolute; inset:0; background:rgba(255,255,255,.6);
  border-radius:var(--radius); display:none; align-items:center; justify-content:center;
  backdrop-filter:saturate(1.1) blur(2px);
}
.form-card.is-sending .sending-overlay{display:flex}

.notice{
  margin-top:14px; padding:12px 14px; border-radius:12px;
  border:1px solid var(--line); background:var(--card); color:var(--text);
  display:none;
}
.notice.success{border-color:#bbf7d0; background:#f0fdf4}
.notice.error{border-color:#fecaca; background:#fef2f2}
.notice.show{display:block}

/* ===========================
   Footer
   =========================== */
footer{background:#fff; border-top:1px solid var(--line)}
.footer-top{
  display:flex; align-items:center; justify-content:space-between; gap:14px; padding:24px 0;
  flex-wrap:wrap;
}
.mini-logos{display:flex; align-items:center; gap:14px}
.mini-logos img{height:24px; width:auto; opacity:.9}
.disclaimer{
  border-top:1px dashed var(--line);
  color:var(--muted); font-size:.9rem; padding:16px 0 26px;
}

/* ===========================
   Floating Bonus Widget
   =========================== */
.float-widget{
  position:fixed; left:20px; right:20px; bottom:24px; z-index:45;
  display:flex; justify-content:center; pointer-events:none;
}
.float-inner{
  pointer-events:auto; position:relative;
  display:flex; align-items:center; gap:14px; padding:16px 18px;
  background:linear-gradient(180deg,#ffffff,#f8fbff);
  border:1px solid var(--line); border-radius:20px; box-shadow:var(--shadow-lg);
  max-width:640px; width:100%;
  transform:translateY(10px) scale(.98); opacity:0; visibility:hidden;
  transition:transform .25s ease, opacity .25s ease, visibility .25s ease, box-shadow .25s ease;
}
.float-inner.show{transform:translateY(0) scale(1); opacity:1; visibility:visible}
.float-logo{width:52px; height:52px; border-radius:14px; overflow:hidden; border:1px solid var(--line); background:#fff; flex:0 0 auto}
.float-logo img{width:100%; height:100%; object-fit:contain}
.float-body{display:grid; gap:4px; min-width:0}
.float-title{font-weight:800; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.float-bonus{color:var(--muted); font-size:.95rem}
.stars{display:flex; gap:2px; align-items:center; color:var(--amber)}
.stars svg{width:16px; height:16px}
.float-actions{display:flex; gap:10px; margin-left:auto; align-items:center}
.float-close{
  appearance:none; border:none; background:transparent; cursor:pointer;
  width:36px; height:36px; border-radius:10px; display:inline-flex; align-items:center; justify-content:center;
}
.float-close:hover{background:var(--card)}
.float-inner::after{
  content:""; position:absolute; left:0; top:0; bottom:0; width:4px; border-radius:20px 0 0 20px;
  background:linear-gradient(180deg, var(--amber), #fbbf24);
}

/* ===========================
   Accessibility & Helpers
   =========================== */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0
}
:focus-visible{outline:3px solid rgba(37,99,235,.4); outline-offset:2px}
section[id]{scroll-margin-top:calc(var(--header-h) + 12px)}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 960px){
  nav.primary-nav{display:none}
  .burger{display:inline-flex}
  .float-widget{left:14px; right:14px}
  .form-row{grid-template-columns:1fr}
}
@media (prefers-reduced-motion: reduce){
  *{transition:none !important; scroll-behavior:auto}
}

/* ===========================
   Page-specific hooks (optional)
   =========================== */
/* .page-review .banner { aspect-ratio: 16/6 } */
/* .page-app    .banner { aspect-ratio: 16/6 } */
/* .page-contact .banner { aspect-ratio: 16/6 } */