/* ==========================================================
   La Luminothérapie — feuille de style
   Couleurs de marque : #C62828 (rouge) / #2563EB (bleu)
   ========================================================== */
:root{
  --red:#C62828;
  --red-dark:#9f1d1d;
  --red-soft:#fdecec;
  --blue:#2563EB;
  --blue-dark:#1d4fc4;
  --blue-soft:#eaf1fe;
  --ink:#1a1f2b;
  --text:#3a4150;
  --muted:#6b7385;
  --line:#e6e8ee;
  --bg:#ffffff;
  --bg-alt:#f7f8fb;
  --radius:16px;
  --shadow:0 10px 30px rgba(26,31,43,.08);
  --shadow-lg:0 20px 50px rgba(26,31,43,.12);
  --maxw:1180px;
  --font:"Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Roboto,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);font-size:17.5px;line-height:1.75;color:var(--text);background:var(--bg)}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{color:var(--ink);line-height:1.25;margin:0 0 .6em;font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.6vw,3.2rem)}
h2{font-size:clamp(1.6rem,3.2vw,2.3rem)}
h3{font-size:clamp(1.18rem,2vw,1.4rem)}
p{margin:0 0 1.15em}
strong{color:var(--ink)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.narrow{max-width:860px;margin-left:auto;margin-right:auto}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:999}
.skip:focus{left:10px;top:10px}

/* Liens éditoriaux */
.content a.inline{color:var(--red);font-weight:600;border-bottom:2px solid rgba(198,40,40,.25);text-decoration:none;transition:border-color .2s}
.content a.inline:hover{border-color:var(--red)}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid transparent;transition:border-color .25s,box-shadow .25s}
.site-header.scrolled{border-color:var(--line);box-shadow:0 4px 18px rgba(26,31,43,.05)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:78px}
.brand img{height:50px;width:auto}
.nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.nav a{display:block;padding:8px 12px;border-radius:10px;color:var(--ink);font-weight:600;font-size:.93rem}
.nav a:hover{background:var(--blue-soft);color:var(--blue);text-decoration:none}
.nav-toggle{display:none;background:none;border:0;width:44px;height:44px;border-radius:10px;cursor:pointer;padding:10px}
.nav-toggle span{display:block;height:2px;background:var(--ink);margin:5px 0;border-radius:2px;transition:.3s}
@media (max-width:1020px){
  .nav-toggle{display:block}
  .nav{position:absolute;top:78px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none}
  .nav.open{display:block}
  .nav ul{flex-direction:column;padding:10px 16px 16px}
  .nav a{padding:12px}
  .brand img{height:40px}
}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:70px 0 80px;background:
  radial-gradient(900px 500px at 105% -10%,rgba(37,99,235,.10),transparent 60%),
  radial-gradient(800px 500px at -10% 110%,rgba(198,40,40,.10),transparent 60%),#fff}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--red);background:var(--red-soft);padding:6px 14px;border-radius:999px;margin-bottom:18px}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--red);box-shadow:0 0 0 4px rgba(198,40,40,.18)}
.hero h1 .accent{background:linear-gradient(90deg,var(--red),var(--blue));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:1.15rem;color:var(--text);max-width:560px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 24px;border-radius:12px;font-weight:700;font-size:.98rem;transition:transform .15s,box-shadow .2s,background .2s}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:var(--red);color:#fff;box-shadow:0 10px 24px rgba(198,40,40,.28)}
.btn-primary:hover{background:var(--red-dark)}
.btn-ghost{background:#fff;color:var(--blue);border:2px solid var(--blue-soft)}
.btn-ghost:hover{border-color:var(--blue)}
.hero-media{position:relative}
.hero-media img{border-radius:22px;box-shadow:var(--shadow-lg)}
.hero-media::after{content:"";position:absolute;inset:auto -18px -18px auto;width:60%;height:60%;border-radius:22px;background:linear-gradient(135deg,var(--blue),var(--red));opacity:.14;z-index:-1}
.trust{display:grid;grid-template-columns:repeat(3,auto);justify-content:start;gap:14px 34px;margin-top:34px;padding-top:24px;border-top:1px solid var(--line)}
.trust div{font-size:.9rem;color:var(--muted);line-height:1.4}
.trust strong{display:block;font-size:1.4rem;color:var(--ink)}
@media (max-width:520px){.trust{grid-template-columns:1fr 1fr}.trust strong{font-size:1.2rem}}
@media (max-width:900px){.hero{padding:40px 0 56px}.hero-grid{grid-template-columns:1fr;gap:36px}}

/* ---------- Sommaire ---------- */
.toc{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;margin:0 auto}
.toc h2{font-size:1.15rem;margin-bottom:12px}
.toc ol{columns:2;column-gap:40px;margin:0;padding-left:20px}
.toc li{margin:4px 0;break-inside:avoid}
.toc a{color:var(--ink);font-weight:600}
.toc a:hover{color:var(--red)}
@media (max-width:700px){.toc ol{columns:1}}

/* ---------- Sections ---------- */
section{padding:72px 0}
.alt{background:var(--bg-alt)}
.section-head{margin-bottom:28px}
.section-head .kicker{display:block;font-size:.8rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:10px}
.content h3{margin-top:1.8em}
.content ul,.content ol{padding-left:1.3em;margin:0 0 1.2em}
.content li{margin:.35em 0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin:36px 0}
.split.reverse .split-media{order:2}
.split-media img{border-radius:20px;box-shadow:var(--shadow-lg)}
figure{margin:0}
figcaption{font-size:.86rem;color:var(--muted);margin-top:10px;text-align:center}
@media (max-width:900px){section{padding:54px 0}.split{grid-template-columns:1fr;gap:26px}.split.reverse .split-media{order:0}}

/* Encadrés */
.callout{border-radius:var(--radius);padding:22px 26px;margin:28px 0;border-left:5px solid var(--blue);background:var(--blue-soft)}
.callout.red{border-left-color:var(--red);background:var(--red-soft)}
.callout p:last-child{margin-bottom:0}
.callout .title{display:block;font-weight:800;color:var(--ink);margin-bottom:6px}

/* Cartes */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:30px 0}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 2px 0 rgba(26,31,43,.02);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .ico{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;margin-bottom:16px;background:var(--red-soft);color:var(--red)}
.card:nth-child(even) .ico{background:var(--blue-soft);color:var(--blue)}
.card .ico svg{width:26px;height:26px}
.card h3{margin:0 0 8px;font-size:1.12rem}
.card p{margin:0;font-size:.97rem}
@media (max-width:980px){.cards{grid-template-columns:1fr 1fr}}
@media (max-width:620px){.cards{grid-template-columns:1fr}}

/* Spectre */
.spectrum{margin:30px 0;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff}
.spectrum-bar{height:18px;background:linear-gradient(90deg,#6a2cd6 0%,#2563EB 18%,#16a34a 38%,#eab308 52%,#f97316 62%,#C62828 76%,#7f1010 88%,#3b0a0a 100%)}
.spectrum-legend{display:grid;grid-template-columns:repeat(4,1fr);font-size:.88rem}
.spectrum-legend div{padding:14px 16px;border-right:1px solid var(--line);line-height:1.45}
.spectrum-legend div:last-child{border-right:0}
.spectrum-legend strong{display:block}
@media (max-width:700px){.spectrum-legend{grid-template-columns:1fr 1fr}.spectrum-legend div:nth-child(2){border-right:0}.spectrum-legend div:nth-child(-n+2){border-bottom:1px solid var(--line)}}

/* Tableaux */
.table-wrap{overflow-x:auto;margin:26px 0;border-radius:var(--radius);border:1px solid var(--line);background:#fff}
table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:640px}
th,td{padding:14px 16px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
thead th{background:var(--ink);color:#fff;font-weight:700;font-size:.9rem}
tbody tr:nth-child(even){background:var(--bg-alt)}
tbody tr:last-child td{border-bottom:0}
td:first-child{font-weight:700;color:var(--ink)}

/* Étapes */
.steps{counter-reset:s;list-style:none;padding:0!important;display:grid;gap:14px}
.steps li{counter-increment:s;position:relative;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px 18px 70px;margin:0!important}
.steps li::before{content:counter(s);position:absolute;left:18px;top:16px;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--red),var(--blue))}

/* Checklist */
.checklist{list-style:none;padding:0!important}
.checklist li{position:relative;padding-left:34px}
.checklist li::before{content:"";position:absolute;left:0;top:.42em;width:20px;height:20px;border-radius:6px;background:var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L19 7'/%3E%3C/svg%3E") center/14px no-repeat}
.warnlist{list-style:none;padding:0!important}
.warnlist li{position:relative;padding-left:34px}
.warnlist li::before{content:"!";position:absolute;left:0;top:.35em;width:20px;height:20px;border-radius:50%;background:var(--red);color:#fff;font-weight:800;font-size:.8rem;display:grid;place-items:center;line-height:1}

/* FAQ */
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:18px 56px 18px 22px;font-weight:700;color:var(--ink);position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:var(--blue-soft);color:var(--blue);display:grid;place-items:center;font-size:1.2rem;font-weight:700;transition:.2s}
.faq details[open] summary::after{content:"–";background:var(--red-soft);color:var(--red)}
.faq .answer{padding:0 22px 18px}
.faq .answer p:last-child{margin-bottom:0}

/* Bandeau final */
.cta-band{background:linear-gradient(120deg,var(--red) 0%,#8b1f5a 50%,var(--blue) 100%);color:#fff;border-radius:24px;padding:48px 40px;text-align:center}
.cta-band h2{color:#fff}
.cta-band p{color:rgba(255,255,255,.92);max-width:720px;margin:0 auto 1em}

/* Footer */
.site-footer{background:#11151f;color:#b7bdca;padding:56px 0 28px;font-size:.93rem}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.site-footer h3{color:#fff;font-size:1rem;margin-bottom:12px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:6px 0}
.site-footer a{color:#dfe3ec}
.footer-logo{background:#fff;border-radius:12px;padding:10px 14px;display:inline-block;margin-bottom:14px}
.footer-logo img{height:44px;width:auto}
.disclaimer{border-top:1px solid #262c3a;margin-top:34px;padding-top:22px;font-size:.84rem;color:#8e95a5}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr}}

/* Retour haut */
.to-top{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:50%;background:var(--red);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .25s;border:0;cursor:pointer}
.to-top.show{opacity:1;pointer-events:auto}
.to-top svg{width:20px;height:20px}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}