:root {
  --ink: #dfe9ff;
  --dim: #8fa6cc;
  --accent: #7fe9ff;
  --warn: #ffd166;
  --panel: rgba(8, 14, 30, 0.62);
  --edge: rgba(127, 233, 255, 0.32);
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "SFMono-Regular", ui-monospace, "Cascadia Code", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: #01030a; color: var(--ink); font-family: var(--font); }
#app { position: fixed; inset: 0; }
#universe { display: block; width: 100%; height: 100%; }
.hidden { display: none !important; }

/* ---- top bar ---- */
#topbar {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; gap: 10px; padding: 12px 16px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em;
  pointer-events: none; text-transform: uppercase;
}
.tag {
  padding: 6px 12px; background: var(--panel); border: 1px solid var(--edge);
  border-radius: 999px; color: var(--dim); backdrop-filter: blur(6px);
}
#status { color: var(--accent); }
#discovered { margin-left: auto; color: var(--warn); }

/* ---- reticle ---- */
#reticle {
  position: absolute; top: 50%; left: 50%; width: 26px; height: 26px;
  transform: translate(-50%, -50%); pointer-events: none;
  border: 1px solid rgba(127, 233, 255, 0.5); border-radius: 50%;
  box-shadow: 0 0 12px rgba(127, 233, 255, 0.25);
}
#reticle::after {
  content: ""; position: absolute; top: 50%; left: 50%; width: 3px; height: 3px;
  transform: translate(-50%, -50%); background: var(--accent); border-radius: 50%;
}

/* ---- body info card ---- */
#hud {
  position: absolute; left: 22px; bottom: 22px; width: min(440px, 42vw);
  padding: 18px 20px; background: var(--panel); border: 1px solid var(--edge);
  border-radius: 16px; backdrop-filter: blur(10px);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55); transition: opacity 0.4s ease;
}
.hud-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--accent);
}
#distance { color: var(--dim); }
#body-name { margin: 6px 0 10px; font-size: 30px; font-weight: 650; line-height: 1.05; letter-spacing: 0.01em; }
.science { margin: 0; font-size: 14.5px; line-height: 1.6; color: #cdd9f2; }
#transmission-wrap { margin-top: 14px; padding-top: 13px; border-top: 1px solid rgba(127, 233, 255, 0.18); }
.trans-label { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; color: var(--warn); margin-bottom: 6px; }
.transmission { margin: 0; font-size: 15.5px; line-height: 1.55; font-style: italic; color: #fff2dc; text-shadow: 0 0 18px rgba(255, 209, 102, 0.2); }

/* ---- relay log ---- */
#log {
  position: absolute; right: 18px; top: 56px; width: 250px; max-height: 60vh;
  overflow: hidden; padding: 12px 14px; background: var(--panel);
  border: 1px solid var(--edge); border-radius: 14px; backdrop-filter: blur(8px);
}
.log-title { font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em; color: var(--accent); margin-bottom: 8px; }
#log-list { list-style: none; margin: 0; padding: 0; }
#log-list li { font-size: 12.5px; line-height: 1.4; color: var(--dim); padding: 7px 0; border-top: 1px solid rgba(127, 233, 255, 0.12); }
#log-list li b { color: var(--ink); font-weight: 600; }

/* ---- event toast ---- */
#event-toast {
  position: absolute; top: 64px; left: 50%; transform: translateX(-50%);
  padding: 10px 22px; background: rgba(255, 120, 90, 0.12); border: 1px solid rgba(255, 150, 110, 0.5);
  border-radius: 999px; color: #ffd9c4; font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em;
  text-transform: uppercase; backdrop-filter: blur(6px); animation: pop 0.5s ease;
}
@keyframes pop { from { opacity: 0; transform: translate(-50%, -10px); } }

/* ---- overlay ---- */
#overlay {
  position: absolute; inset: 0; display: grid; place-items: center;
  background: radial-gradient(1200px 800px at 50% 30%, rgba(20, 40, 80, 0.35), rgba(0, 2, 8, 0.9));
  backdrop-filter: blur(2px); transition: opacity 0.6s ease;
}
.overlay-card { text-align: center; max-width: 560px; padding: 24px; }
.title { font-size: 52px; letter-spacing: 0.22em; margin: 0 0 14px; font-weight: 300;
  background: linear-gradient(180deg, #eaf6ff, #7fe9ff); -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 50px rgba(127, 233, 255, 0.25); }
.intro { font-size: 16px; line-height: 1.65; color: var(--dim); margin: 0 auto 26px; max-width: 460px; }
#engage {
  font-family: var(--mono); font-size: 15px; letter-spacing: 0.2em; color: #02121a;
  background: linear-gradient(180deg, #aef3ff, #4fd2ee); border: none; border-radius: 999px;
  padding: 14px 40px; cursor: pointer; box-shadow: 0 0 40px rgba(127, 233, 255, 0.35); transition: transform 0.15s ease;
}
#engage:hover { transform: translateY(-2px) scale(1.03); }
.controls { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 26px; margin: 28px auto 0; max-width: 420px;
  font-size: 12.5px; color: var(--dim); }
.controls b { color: var(--accent); font-family: var(--mono); font-weight: 600; }
.credit { margin-top: 22px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; color: rgba(143, 166, 204, 0.6); }