/* =============================================================================
   Galilo - feuille de style maison.
   Univers : ciel profond + lumiere doree (Galilee, l observation, le savoir).
   Aucune dependance externe hormis les polices ; tout le reste est dessine ici.
   ========================================================================== */

:root{
  --ink:#060a15;
  --ink-2:#0b1223;
  --ink-3:#101a31;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.07);
  --line:rgba(255,255,255,.10);
  --line-2:rgba(255,255,255,.18);
  --text:#e9edf8;
  --muted:#9aa6c0;
  --muted-2:#7a86a3;
  --gold:#f6b545;
  --gold-2:#ffd98a;
  --blue:#5b7cfa;
  --cyan:#22d3ee;
  --violet:#a78bfa;
  --grad:linear-gradient(115deg,var(--blue),var(--cyan));
  --grad-gold:linear-gradient(115deg,var(--gold),var(--gold-2));
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 24px 60px -20px rgba(0,0,0,.75);
  --wrap:1240px;
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --display:'Outfit','Inter',system-ui,sans-serif;
  --serif:'Fraunces',Georgia,'Times New Roman',serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.12;margin:0;letter-spacing:-.02em}
p{margin:0}

.wrap{width:min(100% - 40px,var(--wrap));margin-inline:auto}
.center{text-align:center}
.muted{color:var(--muted)}
.serif-em{font-family:var(--serif);font-style:italic;font-weight:400;
  background:var(--grad-gold);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ------------------------------------------------------------------ boutons */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.78rem 1.35rem;border-radius:999px;border:1px solid transparent;
  font-weight:600;font-size:.95rem;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--grad);color:#04101c;box-shadow:0 12px 30px -12px rgba(34,211,238,.75)}
.btn-primary:hover{box-shadow:0 18px 40px -12px rgba(34,211,238,.9)}
.btn-gold{background:var(--grad-gold);color:#2a1a00;box-shadow:0 12px 30px -12px rgba(246,181,69,.7)}
.btn-ghost{background:var(--surface);border-color:var(--line-2);color:var(--text)}
.btn-ghost:hover{background:var(--surface-2)}
.btn-sm{padding:.5rem .95rem;font-size:.86rem}
.btn svg{width:18px;height:18px}

/* ------------------------------------------------------------------ entete */
.hdr{
  position:sticky;top:0;z-index:60;
  backdrop-filter:blur(16px);
  background:linear-gradient(to bottom,rgba(6,10,21,.92),rgba(6,10,21,.72));
  border-bottom:1px solid var(--line);
}
.hdr-in{display:flex;align-items:center;gap:1.6rem;height:68px;position:relative}
.brand{display:flex;align-items:center;gap:.6rem;font-family:var(--display);font-weight:700;font-size:1.22rem;letter-spacing:-.03em}
.brand .mark{width:34px;height:34px;flex:none}
.brand small{display:block;font-family:var(--font);font-size:.62rem;font-weight:500;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted-2);line-height:1;margin-top:2px}
.nav{display:flex;gap:.35rem;margin-left:.6rem}
.nav a{padding:.5rem .8rem;border-radius:999px;font-size:.92rem;color:var(--muted);transition:.16s}
.nav a:hover,.nav a.on{color:var(--text);background:var(--surface)}
.hdr-actions{margin-left:auto;display:flex;align-items:center;gap:.6rem}
.burger{display:none;background:none;border:0;color:var(--text);padding:.4rem;cursor:pointer}
.burger svg{width:24px;height:24px}

/* ------------------------------------------------------------------- heros */
.hero{position:relative;padding:clamp(3.5rem,8vw,7rem) 0 clamp(3rem,6vw,5.5rem);overflow:hidden}
.hero-glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.55;pointer-events:none;z-index:0}
.hero-glow.a{width:620px;height:620px;background:#2b4bd8;top:-220px;left:-160px}
.hero-glow.b{width:520px;height:520px;background:#0e7490;top:60px;right:-180px;opacity:.45}
.hero-glow.c{width:420px;height:420px;background:#7c3aed;bottom:-260px;left:38%;opacity:.32}
.hero-stars{position:absolute;inset:0;z-index:1;opacity:.6;pointer-events:none}
.hero-in{position:relative;z-index:2;display:grid;grid-template-columns:1.06fr .94fr;gap:clamp(1.5rem,4vw,3.4rem);align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;padding:.4rem .85rem;border-radius:999px;
  border:1px solid var(--line-2);background:var(--surface);
  font-size:.78rem;letter-spacing:.06em;color:var(--muted);margin-bottom:1.4rem
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--gold);box-shadow:0 0 12px var(--gold)}
.hero h1{font-size:clamp(2.5rem,5.4vw,4.35rem);font-weight:700;margin-bottom:1.25rem}
.hero .lede{font-size:clamp(1.02rem,1.45vw,1.19rem);color:var(--muted);max-width:44ch;margin-bottom:2rem}
.hero-cta{display:flex;flex-wrap:wrap;gap:.8rem;margin-bottom:2.4rem}
.hero-stats{display:flex;flex-wrap:wrap;gap:2.2rem}
.hero-stats b{display:block;font-family:var(--display);font-size:1.65rem;font-weight:700;letter-spacing:-.03em}
.hero-stats span{font-size:.82rem;color:var(--muted-2)}
.hero-art{position:relative}
.hero-art svg{display:block;filter:drop-shadow(0 30px 60px rgba(0,0,0,.55))}

/* --------------------------------------------------------- bandeau matieres */
.marquee{border-block:1px solid var(--line);background:rgba(255,255,255,.02);overflow:hidden;padding:.9rem 0}
.marquee-track{display:flex;gap:2.6rem;width:max-content;animation:slide 46s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-item{display:flex;align-items:center;gap:.55rem;color:var(--muted);font-size:.92rem;white-space:nowrap}
.marquee-item svg{width:18px;height:18px;flex:none}
@keyframes slide{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ---------------------------------------------------------------- sections */
.sec{padding:clamp(3.5rem,7vw,6.5rem) 0;position:relative}
.sec-alt{background:linear-gradient(180deg,transparent,rgba(255,255,255,.028) 12%,rgba(255,255,255,.028) 88%,transparent)}
.sec-head{max-width:44rem;margin-bottom:3rem}
.sec-head.center{margin-inline:auto}
.kicker{font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:600;margin-bottom:.85rem}
.sec-head h2{font-size:clamp(1.85rem,3.4vw,2.85rem);margin-bottom:1rem}
.sec-head p{color:var(--muted);font-size:1.04rem}

/* cartes generiques */
.grid{display:grid;gap:1.15rem}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
.card{
  position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(255,255,255,.055),rgba(255,255,255,.018));
  padding:1.6rem;overflow:hidden;transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease
}
.card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:var(--shadow)}
.card h3{font-size:1.16rem;margin-bottom:.6rem}
.card p{color:var(--muted);font-size:.95rem}
.card-ico{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;margin-bottom:1.15rem;
  background:var(--surface-2);border:1px solid var(--line-2)}
.card-ico svg{width:24px;height:24px}

/* ---------------------------------------------------------------- matieres */
.subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.subject{
  position:relative;border-radius:var(--radius);border:1px solid var(--line);
  padding:1.35rem 1.3rem 1.25rem;overflow:hidden;min-height:168px;
  display:flex;flex-direction:column;
  transition:transform .22s ease,border-color .22s ease
}
.subject::before{content:'';position:absolute;inset:0;opacity:.19;
  background:linear-gradient(150deg,var(--a),var(--b));transition:opacity .25s ease}
.subject::after{content:'';position:absolute;width:190px;height:190px;right:-70px;top:-80px;border-radius:50%;
  background:radial-gradient(circle,var(--b),transparent 68%);opacity:.32;filter:blur(10px)}
.subject:hover{transform:translateY(-5px);border-color:var(--line-2)}
.subject:hover::before{opacity:.32}
.subject .s-ico{position:relative;z-index:2;width:34px;height:34px;margin-bottom:auto;color:#fff;opacity:.95}
.subject .s-name{position:relative;z-index:2;font-family:var(--display);font-weight:600;font-size:1.02rem;margin-top:1rem}
.subject .s-tag{position:relative;z-index:2;font-size:.79rem;color:rgba(255,255,255,.72);line-height:1.4}

/* ------------------------------------------------------------------ etapes */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:1.6rem;counter-reset:step}
.step{position:relative;padding-top:2.9rem}
.step::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  position:absolute;top:0;left:0;font-family:var(--display);font-size:2.1rem;font-weight:700;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.04em
}
.step h3{font-size:1.12rem;margin-bottom:.55rem}
.step p{color:var(--muted);font-size:.95rem}

/* --------------------------------------------------------- vignettes video */
.vgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.4rem 1.15rem}
.vcard{display:block;transition:transform .2s ease}
.vcard:hover{transform:translateY(-4px)}
.vthumb{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:var(--ink-2)}
.vthumb svg,.vthumb img{width:100%;height:100%;display:block;object-fit:cover}
.vthumb .dur{
  position:absolute;right:8px;bottom:8px;padding:.12rem .42rem;border-radius:6px;
  background:rgba(4,8,16,.86);font-size:.74rem;font-weight:600;letter-spacing:.02em
}
.vthumb .play{
  position:absolute;inset:0;display:grid;place-items:center;opacity:0;transition:opacity .2s ease;
  background:rgba(4,8,16,.32)
}
.vcard:hover .play{opacity:1}
.vthumb .play span{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
  background:rgba(255,255,255,.94);color:#06101f}
.vthumb .play span svg{width:22px;height:22px}
.vmeta{display:flex;gap:.75rem;padding-top:.75rem}
.vmeta .av{width:36px;height:36px;font-size:.9rem}
.vtitle{font-family:var(--display);font-weight:600;font-size:.97rem;line-height:1.32;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.vsub{font-size:.82rem;color:var(--muted-2);margin-top:.22rem}
.vsub a:hover{color:var(--text)}

/* avatar degrade */
.av-grad{border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-weight:700;color:#061020;flex:none}

/* --------------------------------------------------------- maquette chaine */
.mock{
  border:1px solid var(--line);border-radius:22px;overflow:hidden;background:var(--ink-2);
  box-shadow:var(--shadow)
}
.mock-bar{display:flex;align-items:center;gap:.45rem;padding:.7rem 1rem;border-bottom:1px solid var(--line);background:rgba(255,255,255,.03)}
.mock-bar i{width:10px;height:10px;border-radius:50%;background:#2a3450;display:block}
.mock-url{margin-left:.8rem;font-size:.78rem;color:var(--muted-2);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.mock-banner{height:132px;position:relative;overflow:hidden}
.mock-body{padding:0 1.3rem 1.5rem}
.mock-id{display:flex;gap:1rem;align-items:center;margin-top:-40px;position:relative;z-index:2}
.mock-id .av{width:76px;height:76px;border:4px solid var(--ink-2);font-size:1.7rem}
.mock-id h4{font-family:var(--display);font-size:1.18rem;font-weight:700;margin:0}
.mock-tabs{display:flex;gap:1.3rem;border-bottom:1px solid var(--line);margin:1.1rem 0 1.2rem;font-size:.88rem;color:var(--muted-2)}
.mock-tabs span{padding-bottom:.6rem}
.mock-tabs span.on{color:var(--text);box-shadow:inset 0 -2px 0 var(--gold)}
.mock-row{display:grid;grid-template-columns:repeat(3,1fr);gap:.8rem}
.mock-row .t{aspect-ratio:16/9;border-radius:9px;overflow:hidden;border:1px solid var(--line)}
.mock-row .l{height:8px;border-radius:4px;background:var(--surface-2);margin-top:.5rem}
.mock-row .l.s{width:62%;background:var(--surface)}

/* ----------------------------------------------------------------- publics */
.who{display:grid;grid-template-columns:repeat(3,1fr);gap:1.15rem}
.who-card{border:1px solid var(--line);border-radius:var(--radius);padding:1.7rem;background:var(--surface);position:relative;overflow:hidden}
.who-card ul{list-style:none;margin:1rem 0 0;padding:0;display:grid;gap:.6rem}
.who-card li{display:flex;gap:.6rem;font-size:.93rem;color:var(--muted)}
.who-card li svg{width:17px;height:17px;flex:none;margin-top:.28rem;color:var(--gold)}

/* ---------------------------------------------------------------- citation */
.quote{
  border:1px solid var(--line);border-radius:var(--radius);padding:clamp(1.8rem,3.5vw,3rem);
  background:linear-gradient(150deg,rgba(91,124,250,.14),rgba(34,211,238,.06));position:relative;overflow:hidden
}
.quote p{font-family:var(--serif);font-size:clamp(1.15rem,2.1vw,1.6rem);line-height:1.5;font-style:italic;max-width:52ch}
.quote footer{margin-top:1.3rem;display:flex;align-items:center;gap:.75rem;color:var(--muted);font-size:.9rem}
.quote footer .av{width:42px;height:42px}

/* ------------------------------------------------------------- appel final */
.cta{position:relative;border-radius:26px;overflow:hidden;border:1px solid var(--line-2);
  padding:clamp(2.4rem,5vw,4.2rem);text-align:center;background:var(--ink-2)}
.cta h2{font-size:clamp(1.9rem,3.6vw,3rem);margin-bottom:1rem;position:relative;z-index:2}
.cta p{color:var(--muted);max-width:48ch;margin:0 auto 2rem;position:relative;z-index:2}
.cta .hero-cta{justify-content:center;position:relative;z-index:2;margin-bottom:0}

/* -------------------------------------------------------------------- pied */
.ftr{border-top:1px solid var(--line);padding:3.4rem 0 2.2rem;background:rgba(255,255,255,.02);margin-top:2rem}
.ftr-in{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:2rem}
.ftr h5{font-family:var(--display);font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted-2);margin:0 0 1rem;font-weight:600}
.ftr ul{list-style:none;padding:0;margin:0;display:grid;gap:.55rem}
.ftr a{color:var(--muted);font-size:.92rem}
.ftr a:hover{color:var(--text)}
.ftr-bottom{margin-top:2.6rem;padding-top:1.5rem;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;color:var(--muted-2);font-size:.84rem}

/* ---------------------------------------------------------- pages internes */
.page{padding:2.4rem 0 4rem;min-height:70vh}
.page-head{display:flex;flex-wrap:wrap;gap:1rem;align-items:end;justify-content:space-between;margin-bottom:1.8rem}
.page-head h1{font-size:clamp(1.7rem,3vw,2.3rem)}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:2rem}
.chip{padding:.45rem .95rem;border-radius:999px;border:1px solid var(--line);background:var(--surface);
  font-size:.86rem;color:var(--muted);cursor:pointer;transition:.16s;display:inline-flex;align-items:center;gap:.45rem}
.chip:hover{background:var(--surface-2);color:var(--text)}
.chip.on{background:var(--text);color:var(--ink);border-color:var(--text);font-weight:600}
.chip svg{width:16px;height:16px}
.searchbox{display:flex;align-items:center;gap:.55rem;padding:.55rem 1rem;border-radius:999px;
  border:1px solid var(--line);background:var(--surface);min-width:min(360px,100%)}
.searchbox input{background:none;border:0;color:var(--text);font:inherit;font-size:.92rem;outline:none;width:100%}
.searchbox svg{width:17px;height:17px;color:var(--muted-2);flex:none}

/* chaine */
.ch-banner{height:clamp(140px,22vw,230px);border-radius:20px;position:relative;overflow:hidden;border:1px solid var(--line)}
.ch-id{display:flex;gap:1.4rem;align-items:flex-end;margin-top:-52px;padding:0 1.4rem;position:relative;z-index:2}
.ch-id .av{width:118px;height:118px;border:5px solid var(--ink);font-size:2.4rem}
.ch-id h1{font-size:clamp(1.5rem,3vw,2.15rem)}
.ch-meta{color:var(--muted-2);font-size:.92rem;margin-top:.35rem}
.ch-bio{color:var(--muted);max-width:62ch;margin-top:.7rem;font-size:.95rem}
.ch-actions{margin-left:auto;display:flex;gap:.6rem;padding-bottom:.4rem}
.tabs{display:flex;gap:1.6rem;border-bottom:1px solid var(--line);margin:2rem 0 1.8rem}
.tabs a,.tabs span{padding-bottom:.75rem;font-size:.95rem;color:var(--muted-2);cursor:pointer}
.tabs .on{color:var(--text);font-weight:600;box-shadow:inset 0 -2px 0 var(--gold)}

/* lecture */
.watch{display:grid;grid-template-columns:1fr 372px;gap:2rem;align-items:start}
.player{border-radius:16px;overflow:hidden;border:1px solid var(--line);background:#000;aspect-ratio:16/9;position:relative}
.player video{width:100%;height:100%;display:block}
.player .ph{position:absolute;inset:0;display:block}
.player .ph-note{position:absolute;left:0;right:0;bottom:0;padding:1rem 1.2rem;font-size:.85rem;color:var(--muted);
  background:linear-gradient(to top,rgba(4,8,16,.92),transparent)}

/* Le cadre de lecture quand la video vit ailleurs (mathsetsciences) :
   on montre la premiere image, et le clic ouvre la vraie lecon. */
.player.is-link{display:block;cursor:pointer;text-decoration:none}
.player.is-link::after{content:'';position:absolute;inset:0;background:rgba(4,8,16,.18);
  transition:background .22s ease;pointer-events:none}
.player.is-link:hover::after{background:rgba(4,8,16,.34)}
.player .play-big{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:clamp(66px,9vw,94px);height:clamp(66px,9vw,94px);border-radius:50%;
  background:rgba(255,255,255,.95);display:grid;place-items:center;z-index:2;
  box-shadow:0 20px 46px -12px rgba(0,0,0,.7);transition:transform .22s ease,background .22s ease
}
.player .play-big svg{width:38%;height:38%;color:#06101f;margin-left:8%}
.player.is-link:hover .play-big{transform:translate(-50%,-50%) scale(1.08);background:#fff}
.player .src-badge{
  position:absolute;top:14px;left:14px;z-index:2;display:inline-flex;align-items:center;gap:.45rem;
  padding:.42rem .85rem;border-radius:999px;font-size:.8rem;font-weight:600;
  background:rgba(4,8,16,.72);border:1px solid rgba(255,255,255,.22);color:var(--text);
  backdrop-filter:blur(8px)
}
.player .src-badge svg{width:15px;height:15px;color:var(--gold)}
.player.is-link .ph-note{z-index:2;opacity:0;transition:opacity .22s ease}
.player.is-link:hover .ph-note{opacity:1}
.watch h1{font-size:clamp(1.2rem,2.2vw,1.6rem);margin:1.2rem 0 .8rem}
.watch-bar{display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between;
  padding-bottom:1.2rem;border-bottom:1px solid var(--line)}
.watch-owner{display:flex;gap:.8rem;align-items:center}
.watch-owner .av{width:46px;height:46px;font-size:1.1rem}
.pill-row{display:flex;gap:.5rem;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:.45rem;padding:.5rem .95rem;border-radius:999px;
  background:var(--surface);border:1px solid var(--line);font-size:.87rem}
.pill svg{width:16px;height:16px}
.desc{margin-top:1.2rem;padding:1.1rem 1.25rem;border-radius:14px;background:var(--surface);border:1px solid var(--line)}
.desc .stats{font-size:.87rem;font-weight:600;margin-bottom:.6rem}
.desc p{color:var(--muted);font-size:.94rem}
.aside-list{display:grid;gap:.9rem}
.aside-item{display:grid;grid-template-columns:168px 1fr;gap:.75rem}
.aside-item .vthumb{border-radius:10px}
.aside-item .vtitle{font-size:.9rem}

.empty{border:1px dashed var(--line-2);border-radius:var(--radius);padding:3rem;text-align:center;color:var(--muted)}

/* -------------------------------------------------------------- responsive */
@media (max-width:1080px){
  .hero-in{grid-template-columns:1fr;gap:2.6rem}
  .hero-art{order:-1;max-width:560px}
  .subjects{grid-template-columns:repeat(3,1fr)}
  .vgrid{grid-template-columns:repeat(3,1fr)}
  .watch{grid-template-columns:1fr}
  .ftr-in{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  .nav{display:none}
  .burger{display:block}
  .nav.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;padding:1rem;
    background:var(--ink-2);border-bottom:1px solid var(--line);z-index:70}
  .g-3,.g-4,.steps,.who{grid-template-columns:1fr}
  .subjects{grid-template-columns:repeat(2,1fr)}
  .vgrid{grid-template-columns:repeat(2,1fr)}
  .mock-row{grid-template-columns:1fr 1fr}
  .hero-stats{gap:1.4rem}
  .ch-id{flex-direction:column;align-items:flex-start;gap:.9rem}
  .ch-actions{margin-left:0}
}
@media (max-width:520px){
  .vgrid,.subjects{grid-template-columns:1fr}
  .aside-item{grid-template-columns:140px 1fr}
  .ftr-in{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}