/* ==========================================================================
   NORDERLANDS — Design system (sci-fi cinématique sombre)
   Feuille de styles partagée. Utilisée par la page d'accueil ; réutilisable
   par les futures pages. © 2026 Norderlands.
   ========================================================================== */

:root{
  --bg:#05060d; --bg2:#0a0e1f;
  --cyan:#56e1ff; --violet:#9b7bff; --gold:#ffce6b;
  --txt:#e8ecff; --muted:#9aa3c7; --line:rgba(120,150,255,.18);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--txt);
  font-family:"Exo 2",system-ui,sans-serif; line-height:1.7;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* --- starfield ---------------------------------------------------------- */
#stars{position:fixed;inset:0;z-index:0;display:block}

/* --- navigation (homepage uniquement) ----------------------------------- */
header{position:fixed;top:0;left:0;right:0;z-index:40;
  backdrop-filter:blur(12px);background:rgba(5,6,13,.55);
  border-bottom:1px solid var(--line)}
nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font:900 20px/1 "Orbitron";letter-spacing:.22em;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:30px;font-size:14px;letter-spacing:.06em;color:var(--muted)}
.nav-links a{transition:color .25s}
.nav-links a:hover{color:var(--cyan)}
.nav-cta{border:1px solid var(--cyan);color:var(--cyan);padding:8px 18px;
  border-radius:999px;font-size:13px;letter-spacing:.08em;transition:.25s}
.nav-cta:hover{background:var(--cyan);color:#04121a;box-shadow:0 0 24px rgba(86,225,255,.5)}
@media(max-width:760px){.nav-links{display:none}}

/* --- hero --------------------------------------------------------------- */
.hero{position:relative;z-index:1;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero-img{position:absolute;inset:0;background:url("../../img/black-hole3.jpg") center/cover no-repeat;
  opacity:.5;transform:scale(1.08);filter:saturate(1.1)}
.hero::after{content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse at 60% 40%,transparent 0%,var(--bg) 78%),
  linear-gradient(180deg,rgba(5,6,13,.4),var(--bg) 95%)}
.hero-inner{position:relative;z-index:2}
.eyebrow{font:500 13px/1 "Exo 2";letter-spacing:.42em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:22px}
h1{font:900 clamp(46px,9vw,104px)/.96 "Orbitron";letter-spacing:.04em;
  text-shadow:0 0 40px rgba(86,225,255,.25)}
h1 span{background:linear-gradient(90deg,var(--cyan),var(--violet) 60%,var(--gold));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.lead{max-width:560px;margin:26px 0 38px;font-size:19px;color:var(--muted)}
.btns{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary{font:600 15px "Exo 2";letter-spacing:.05em;padding:15px 34px;border-radius:999px;
  color:#04121a;background:linear-gradient(90deg,var(--cyan),var(--violet));
  box-shadow:0 0 30px rgba(86,225,255,.35);transition:.3s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 46px rgba(155,123,255,.6)}
.btn-ghost{font:600 15px "Exo 2";letter-spacing:.05em;padding:15px 30px;border-radius:999px;
  border:1px solid var(--line);color:var(--txt);transition:.3s}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.scroll-hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;
  color:var(--muted);font-size:12px;letter-spacing:.3em;text-transform:uppercase;animation:bob 2.4s infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0);opacity:.5}50%{transform:translate(-50%,8px);opacity:1}}

/* --- chapitres ---------------------------------------------------------- */
section.chapters{position:relative;z-index:1;padding:110px 0 90px;
  background:linear-gradient(180deg,var(--bg),var(--bg2))}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .eyebrow{margin-bottom:14px}
.sec-head h2{font:700 clamp(28px,4vw,42px)/1.1 "Orbitron";letter-spacing:.03em}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px}
.card{position:relative;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  background:rgba(12,16,34,.6);transition:.35s;min-height:300px;display:flex;flex-direction:column}
.card:hover{transform:translateY(-6px);border-color:rgba(86,225,255,.45);
  box-shadow:0 20px 50px rgba(0,0,0,.5),0 0 30px rgba(86,225,255,.12)}
.card-img{height:170px;background-size:cover;background-position:center;position:relative}
.card-img::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 30%,rgba(12,16,34,.9))}
.card-num{position:absolute;top:12px;left:14px;z-index:2;font:700 13px "Orbitron";
  letter-spacing:.2em;color:var(--gold);background:rgba(5,6,13,.6);padding:5px 11px;border-radius:999px;
  border:1px solid rgba(255,206,107,.3)}
.card-body{padding:18px 20px 22px;flex:1;display:flex;flex-direction:column}
.card-body h3{font:600 19px "Orbitron";letter-spacing:.02em;margin-bottom:8px}
.card-body p{font-size:14px;color:var(--muted);flex:1}
.card-go{margin-top:14px;font-size:13px;letter-spacing:.08em;color:var(--cyan);
  display:flex;align-items:center;gap:7px}

/* --- footer (homepage uniquement) --------------------------------------- */
footer{position:relative;z-index:1;background:var(--bg);border-top:1px solid var(--line);
  padding:54px 0 30px}
.foot-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:28px;margin-bottom:34px}
.foot-logo{font:900 18px "Orbitron";letter-spacing:.22em;
  background:linear-gradient(90deg,var(--cyan),var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}
.foot-col{max-width:260px}
.foot-col h4{font:600 13px "Exo 2";letter-spacing:.12em;text-transform:uppercase;color:var(--txt);margin-bottom:12px}
.foot-col a{display:block;font-size:14px;color:var(--muted);margin-bottom:7px;transition:.2s}
.foot-col a:hover{color:var(--cyan)}
.foot-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;
  flex-wrap:wrap;gap:10px;font-size:13px;color:var(--muted)}