@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300;9..144,500;9..144,600&family=Space+Grotesk:wght@400;500;600&family=Inter:wght@400;500&display=swap');

:root{
  --bg: #05060a;
  --ink: #EDEFF5;
  --ink-dim: #8A8FA3;
  --ink-faint: #4C5066;
  --line: rgba(237,239,245,0.12);
  --glass: rgba(10,12,20,0.55);
  --accent: #EDEFF5;
  --radius: 18px;
  --font-display: 'Fraunces', serif;
  --font-nav: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}

*{ box-sizing:border-box; margin:0; padding:0; }

html,body{
  width:100%; height:100%;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
}

#scene{
  position:fixed; inset:0;
  width:100%; height:100%;
  display:block;
  cursor:grab;
}
#scene:active{ cursor:grabbing; }

/* ---------- Loader ---------- */
#loader{
  position:fixed; inset:0; z-index:100;
  background:var(--bg);
  display:flex; align-items:center; justify-content:center;
  transition:opacity 0.8s ease;
}
#loader.hidden{ opacity:0; pointer-events:none; }
.loader-inner{ text-align:center; }
.loader-orbit{
  width:56px; height:56px; margin:0 auto 20px;
  border:1px solid var(--line);
  border-radius:50%;
  position:relative;
  animation:spin 2.2s linear infinite;
}
.loader-dot{
  width:8px; height:8px; border-radius:50%;
  background:var(--ink);
  position:absolute; top:-4px; left:50%;
  transform:translateX(-50%);
  box-shadow:0 0 12px 2px rgba(237,239,245,0.6);
}
@keyframes spin{ to{ transform:rotate(360deg); } }
.loader-inner p{ font-family:var(--font-nav); font-size:13px; letter-spacing:0.08em; color:var(--ink-dim); text-transform:uppercase; }

/* ---------- Topbar ---------- */
#topbar{
  position:fixed; top:0; left:0; right:0; z-index:20;
  display:flex; align-items:center; justify-content:space-between;
  padding:28px 40px;
  pointer-events:none;
}
.brand{
  font-family:var(--font-nav); font-weight:600; font-size:13px;
  letter-spacing:0.22em;
  color:var(--ink);
  pointer-events:auto;
  cursor:pointer;
  user-select:none;
}
#navbar{
  position:absolute; top:50%; left:50%; transform:translate(-50%, -50%);
  display:flex; gap:6px;
  padding:6px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--glass);
  backdrop-filter:blur(14px);
  pointer-events:auto;
}
.planet-link{
  font-family:var(--font-nav); font-size:12px; letter-spacing:0.03em;
  background:none; border:none; color:var(--ink-dim);
  padding:9px 16px; border-radius:999px;
  cursor:pointer;
  transition:color 0.3s ease, background 0.3s ease;
  position:relative;
}
.planet-link:hover{ color:var(--ink); background:rgba(237,239,245,0.08); }
.planet-link.active{ color:var(--bg); background:var(--ink); }
#menu-toggle{ display:none; background:none; border:none; color:var(--ink); font-size:20px; pointer-events:auto; cursor:pointer; }

/* ---------- Back button ---------- */
#back-btn{
  position:fixed; top:96px; left:40px; z-index:25;
  font-family:var(--font-nav); font-size:12px; letter-spacing:0.05em;
  color:var(--ink-dim); background:none; border:1px solid var(--line);
  padding:10px 18px; border-radius:999px;
  cursor:pointer;
  transition:all 0.3s ease;
  opacity:0; transform:translateY(-8px);
}
#back-btn:not(.hidden){ opacity:1; transform:translateY(0); }
#back-btn.hidden{ pointer-events:none; }
#back-btn:hover{ color:var(--ink); border-color:var(--ink-faint); }

/* ---------- Info panel ---------- */
#info-panel{
  position:fixed; top:0; right:0; height:100%; width:min(400px, 88vw);
  z-index:20;
  padding:120px 40px 60px;
  background:linear-gradient(90deg, transparent, rgba(5,6,10,0.55) 40px, rgba(5,6,10,0.86));
  backdrop-filter:blur(6px);
  display:flex; flex-direction:column; gap:18px;
  transform:translateX(100%);
  transition:transform 0.9s cubic-bezier(0.16,1,0.3,1), opacity 0.6s ease;
  opacity:0;
  overflow-y:auto;
}
#info-panel:not(.hidden){ transform:translateX(0); opacity:1; }
.info-eyebrow{
  font-family:var(--font-nav); font-size:11px; letter-spacing:0.2em; text-transform:uppercase;
  color:var(--ink-faint);
}
#info-name{
  font-family:var(--font-display); font-weight:500; font-size:44px; line-height:1.05;
  color:var(--ink);
}
#info-tagline{
  font-family:var(--font-display); font-style:italic; font-weight:300; font-size:17px;
  color:var(--ink-dim);
  padding-bottom:6px; border-bottom:1px solid var(--line);
}
.info-stats{
  display:grid; grid-template-columns:1fr 1fr; gap:16px 20px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
}
.stat{ display:flex; flex-direction:column; gap:4px; }
.stat-label{ font-family:var(--font-nav); font-size:10px; letter-spacing:0.08em; text-transform:uppercase; color:var(--ink-faint); }
.stat-value{ font-family:var(--font-body); font-size:15px; color:var(--ink); }
#info-desc{ font-size:14.5px; line-height:1.75; color:var(--ink-dim); }

/* ---------- Intro screen ---------- */
#intro-screen{
  position:fixed; inset:0; z-index:90;
  display:flex; align-items:center; justify-content:center;
  background:radial-gradient(ellipse at center, rgba(10,14,26,0.55), rgba(2,3,7,0.92));
  backdrop-filter:blur(2px);
  transition:opacity 0.9s ease, visibility 0.9s;
}
#intro-screen.hidden{ opacity:0; visibility:hidden; pointer-events:none; }
.intro-content{ max-width:560px; text-align:center; padding:0 28px; }
.intro-eyebrow{ font-family:var(--font-nav); font-size:11px; letter-spacing:0.24em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:18px; }
.intro-title{ font-family:var(--font-display); font-weight:500; font-size:clamp(40px,7vw,72px); letter-spacing:0.01em; margin-bottom:20px; }
.intro-text{ font-size:15.5px; line-height:1.75; color:var(--ink-dim); margin-bottom:34px; }
#intro-enter{
  font-family:var(--font-nav); font-size:13px; letter-spacing:0.06em;
  background:var(--ink); color:var(--bg); border:none;
  padding:15px 34px; border-radius:999px; cursor:pointer;
  transition:transform 0.25s ease, opacity 0.25s ease;
}
#intro-enter:hover{ transform:scale(1.04); opacity:0.9; }
.intro-hint{ margin-top:18px; font-size:11.5px; color:var(--ink-faint); }

/* ---------- Tool buttons (sound / compare) ---------- */
#tool-buttons{
  position:fixed; bottom:24px; right:28px; z-index:20;
  display:flex; gap:10px; align-items:center;
}
#sound-toggle{
  width:40px; height:40px; border-radius:50%;
  background:var(--glass); border:1px solid var(--line); color:var(--ink);
  font-size:16px; cursor:pointer; backdrop-filter:blur(10px);
  transition:background 0.3s ease;
}
#sound-toggle:hover{ background:rgba(237,239,245,0.14); }
#compare-toggle{
  font-family:var(--font-nav); font-size:11.5px; letter-spacing:0.04em;
  background:var(--glass); border:1px solid var(--line); color:var(--ink-dim);
  padding:10px 16px; border-radius:999px; cursor:pointer;
  backdrop-filter:blur(10px);
  transition:all 0.3s ease;
}
#compare-toggle:hover{ color:var(--ink); border-color:var(--ink-faint); }
#compare-toggle.active{ background:var(--ink); color:var(--bg); }

#compare-label{
  position:fixed; top:100px; left:50%; transform:translateX(-50%);
  z-index:15;
  font-family:var(--font-nav); font-size:11.5px; letter-spacing:0.05em;
  color:var(--ink-dim);
  background:var(--glass); border:1px solid var(--line); border-radius:999px;
  padding:9px 20px; backdrop-filter:blur(10px);
  transition:opacity 0.4s ease;
}
#compare-label.hidden{ opacity:0; pointer-events:none; }

/* ---------- Footer ---------- */
#site-footer{
  position:fixed; bottom:20px; left:40px; z-index:15;
  display:flex; flex-direction:column; align-items:flex-start; gap:6px;
  pointer-events:none;
}
#site-footer a{
  pointer-events:auto;
  color:var(--ink-faint);
  font-size:15px;
  transition:color 0.3s ease;
}
#site-footer a:hover{ color:var(--ink); }
.footer-liens{ display:flex; gap:14px; }
#site-footer p{
  font-family:var(--font-nav); font-size:10px; letter-spacing:0.03em;
  color:var(--ink-faint); margin:0;
}

/* ---------- Hint ---------- */
.hint{
  position:fixed; bottom:28px; left:50%; transform:translateX(-50%);
  font-family:var(--font-nav); font-size:11px; letter-spacing:0.05em;
  color:var(--ink-faint);
  z-index:15;
  transition:opacity 0.6s ease;
  pointer-events:none;
  text-align:center; width:90%;
}
.hint.hidden{ opacity:0; }

@media (max-width:720px){
  #topbar{ padding:16px 20px; }
  .brand{ font-size:11px; }
  #navbar{ display:none; position:static; transform:none; }
  #navbar.open{
    display:flex; flex-wrap:wrap; position:fixed; top:64px; left:16px; right:16px;
    border-radius:16px; justify-content:center; max-height:40vh; overflow-y:auto;
    z-index:22;
  }
  #menu-toggle{ display:block; }

  #back-btn{ left:16px; top:16px; font-size:11px; padding:8px 14px; }

  #info-panel{ width:100%; padding:90px 22px 120px; }
  #info-name{ font-size:30px; }
  .info-stats{ grid-template-columns:1fr 1fr; gap:12px 16px; }

  .intro-content{ padding:0 20px; }
  .intro-text{ font-size:13.5px; }
  #intro-enter{ padding:13px 28px; font-size:12px; }

  #hint{ display:none; } /* trop de texte pour un petit écran, on le retire plutôt que de le compresser */

  #tool-buttons{
    bottom:16px; top:auto; right:16px;
    flex-direction:row; align-items:center; gap:8px;
  }
  #compare-toggle{ font-size:0; padding:0; width:40px; height:40px; border-radius:50%; }
  #compare-toggle::before{ content:"⇔"; font-size:16px; }

  #compare-label{
    top:auto; bottom:76px; left:50%; transform:translateX(-50%);
    width:90%; max-width:320px; text-align:center; font-size:10.5px;
  }

  #site-footer{ left:16px; bottom:12px; gap:4px; }
  #site-footer a{ font-size:13px; }
  .footer-liens{ gap:12px; }
  #site-footer p{ font-size:8.5px; }
}

@media (max-width:400px){
  .info-stats{ grid-template-columns:1fr; }
  #info-name{ font-size:26px; }
}