/* Space — Observable Universe : shared dark cosmic theme */
:root {
  --bg: #04050d;
  --bg2: #0a0d1f;
  --panel: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.10);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.62);
  --cyan: #4fe3ff;
  --purple: #b39dff;
  --accent: #6fa8ff;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(1200px 800px at 70% -10%, #131a3a 0%, transparent 60%),
    radial-gradient(900px 700px at 10% 10%, #1a1030 0%, transparent 55%),
    linear-gradient(180deg, var(--bg2) 0%, var(--bg) 100%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* drifting starfield */
.stars, .stars::after {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    radial-gradient(1.5px 1.5px at 20% 30%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 80% 20%, #cfe0ff, transparent),
    radial-gradient(1px 1px at 50% 60%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 35% 80%, #ffe9c0, transparent),
    radial-gradient(1px 1px at 65% 45%, #fff, transparent),
    radial-gradient(1px 1px at 90% 75%, #cfe0ff, transparent),
    radial-gradient(1.5px 1.5px at 10% 65%, #fff, transparent);
  background-repeat: repeat;
  background-size: 600px 600px;
  opacity: 0.5;
}
.stars::after { content: ""; background-size: 400px 400px; opacity: 0.3; animation: drift 120s linear infinite; }
@keyframes drift { from { transform: translateY(0); } to { transform: translateY(-400px); } }

.wrap { position: relative; z-index: 1; max-width: 860px; margin: 0 auto; padding: 0 22px; }

/* nav */
header.nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(4, 5, 13, 0.55);
  border-bottom: 1px solid var(--border);
}
.nav-inner { max-width: 860px; margin: 0 auto; padding: 14px 22px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: #fff; text-decoration: none; }
.brand .dot { width: 22px; height: 22px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff, #4fa3e0 55%, #1b3a6b);
  box-shadow: 0 0 14px rgba(79, 163, 224, 0.7); }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500; margin-left: 18px; transition: color .2s; }
.nav-links a:hover { color: #fff; }

/* hero */
.hero { text-align: center; padding: 90px 0 60px; }
.hero .planet {
  width: 150px; height: 150px; border-radius: 50%; margin: 0 auto 30px;
  background: radial-gradient(circle at 36% 32%, #eaf4ff 0%, #4fa3e0 42%, #14407a 78%, #0a2348 100%);
  box-shadow: 0 0 60px rgba(79, 163, 224, 0.55), inset -18px -10px 40px rgba(0,0,0,0.5);
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
h1 {
  font-size: clamp(34px, 6vw, 54px); font-weight: 800; letter-spacing: -0.5px; line-height: 1.1;
  background: linear-gradient(100deg, #fff, var(--cyan) 55%, var(--purple));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.tagline { font-size: clamp(16px, 2.4vw, 20px); color: var(--muted); max-width: 600px; margin: 18px auto 0; }

.btn-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 26px; border-radius: 100px;
  font-weight: 600; font-size: 15px; text-decoration: none; transition: transform .15s, box-shadow .2s;
}
.btn-primary { background: linear-gradient(100deg, var(--cyan), var(--accent)); color: #04050d;
  box-shadow: 0 8px 30px rgba(79, 227, 255, 0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 38px rgba(79, 227, 255, 0.5); }
.btn-ghost { background: var(--panel); color: #fff; border: 1px solid var(--border); }
.btn-ghost:hover { background: rgba(255,255,255,0.08); transform: translateY(-2px); }

/* feature grid */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; padding: 30px 0 70px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 24px; transition: transform .2s, border-color .2s; }
.card:hover { transform: translateY(-4px); border-color: rgba(79, 227, 255, 0.4); }
.card .ico { font-size: 26px; margin-bottom: 12px; }
.card h3 { font-size: 17px; margin-bottom: 6px; }
.card p { font-size: 14px; color: var(--muted); }

/* legal / content pages */
.content { padding: 50px 0 80px; }
.content h1 { font-size: clamp(30px, 5vw, 42px); margin-bottom: 6px; }
.content .updated { color: var(--muted); font-size: 14px; margin-bottom: 36px; }
.content h2 { font-size: 22px; margin: 38px 0 12px; color: #fff; }
.content h3 { font-size: 17px; margin: 24px 0 8px; color: var(--cyan); }
.content p, .content li { color: rgba(255,255,255,0.78); font-size: 15.5px; margin-bottom: 12px; }
.content ul { padding-left: 22px; margin-bottom: 14px; }
.content li { margin-bottom: 8px; }
.content a { color: var(--cyan); }
.content strong { color: #fff; }
.callout { background: var(--panel); border: 1px solid var(--border); border-left: 3px solid var(--cyan);
  border-radius: 12px; padding: 18px 20px; margin: 22px 0; }
.callout p:last-child { margin-bottom: 0; }

.contact-box { background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 28px; margin: 26px 0; text-align: center; }
.contact-box .email { font-size: 22px; font-weight: 700; color: #fff; display: inline-block; margin-top: 8px; text-decoration: none; }
.contact-box .email:hover { color: var(--cyan); }

/* faq */
details { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 0; margin-bottom: 12px; overflow: hidden; }
summary { cursor: pointer; padding: 18px 20px; font-weight: 600; font-size: 15.5px; list-style: none; display: flex; justify-content: space-between; align-items: center; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--cyan); font-size: 22px; font-weight: 400; }
details[open] summary::after { content: "−"; }
details .answer { padding: 0 20px 18px; color: var(--muted); font-size: 14.5px; }

/* footer */
footer { border-top: 1px solid var(--border); padding: 34px 0; text-align: center; color: var(--muted); font-size: 13.5px; }
footer a { color: var(--muted); text-decoration: none; margin: 0 10px; }
footer a:hover { color: #fff; }
.footer-links { margin-bottom: 14px; }