:root {
  --bg: #070b12;
  --bg-2: #0e1624;
  --ink: #e8eef7;
  --muted: #8b9bb3;
  --gold: #d7b46a;
  --gold-soft: rgba(215, 180, 106, 0.18);
  --line: rgba(232, 238, 247, 0.1);
  --ok: #6ecf9a;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Sora", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
}

body {
  overflow: hidden;
}

.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255,255,255,0.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 28% 72%, rgba(255,255,255,0.35) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 64% 22%, rgba(255,255,255,0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 81% 58%, rgba(255,255,255,0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 45% 40%, rgba(255,255,255,0.3) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 8% 88%, rgba(255,255,255,0.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 12%, rgba(255,255,255,0.35) 50%, transparent 51%);
  animation: twinkle 8s ease-in-out infinite alternate;
}

.nebula {
  position: fixed;
  inset: -20%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 50% 40% at 70% 10%, rgba(60, 110, 150, 0.22), transparent 60%),
    radial-gradient(ellipse 45% 35% at 15% 80%, rgba(180, 120, 60, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 50% at 50% 50%, rgba(14, 22, 36, 0.9), transparent 70%);
}

.shell {
  position: relative;
  z-index: 1;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.75rem;
  padding: clamp(0.75rem, 1.8vh, 1.25rem) clamp(0.85rem, 2.5vw, 1.75rem) clamp(0.75rem, 1.8vh, 1.25rem);
}

.top {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) auto minmax(0, 1fr);
  gap: 0.75rem 1.25rem;
  align-items: center;
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.hint {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: clamp(0.7rem, 1.4vw, 0.85rem);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.live {
  text-align: center;
}

.live-label {
  margin: 0;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.live-weight {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  transition: opacity 0.25s ease;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  justify-content: flex-end;
}

button {
  font: inherit;
  cursor: pointer;
  border-radius: 0.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

button:active {
  transform: scale(0.97);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.primary {
  background: var(--gold);
  color: #1a1408;
  border-color: transparent;
  font-weight: 600;
}

.primary:hover:not(:disabled) {
  filter: brightness(1.05);
}

.ghost {
  background: transparent;
  color: var(--ink);
}

.ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(232, 238, 247, 0.25);
}

.status {
  font-size: 0.75rem;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.status.online {
  color: var(--ok);
  border-color: rgba(110, 207, 154, 0.35);
  background: rgba(110, 207, 154, 0.08);
}

.status.offline {
  color: var(--muted);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(4, 8, 14, 0.72);
  backdrop-filter: blur(6px);
}

.modal[hidden] {
  display: none;
}

.modal-card {
  width: min(420px, 100%);
  padding: 1.35rem 1.4rem 1.2rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: #0e1624;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.modal-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.45rem;
}

.modal-step {
  margin: 0.65rem 0 1rem;
  color: var(--muted);
  line-height: 1.4;
  font-size: 0.92rem;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.modal-field input {
  padding: 0.65rem 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--line);
  background: #070b12;
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  text-transform: none;
  letter-spacing: 0;
}

.modal-hint {
  margin: -0.35rem 0 0.85rem;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.35;
}

.modal-hint strong {
  color: var(--ink);
}

.modal-msg {
  min-height: 1.2em;
  margin: 0 0 1rem;
  font-size: 0.88rem;
  color: var(--gold);
}

.modal-msg.error {
  color: #e07a6a;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.worlds {
  min-height: 0;
  display: flex;
}

.grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: clamp(0.5rem, 1.2vw, 0.85rem);
  width: 100%;
  min-height: 0;
}

.world {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 0;
  padding: clamp(0.4rem, 1vh, 0.75rem);
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
  transition: transform 0.35s ease, border-color 0.35s ease, background 0.35s ease;
  animation: rise 0.55s ease both;
}

.world:hover {
  transform: translateY(-3px);
  border-color: rgba(215, 180, 106, 0.35);
  background: linear-gradient(180deg, var(--gold-soft), rgba(255,255,255,0.02));
}

.world.moon {
  border-color: rgba(200, 210, 230, 0.28);
}

.world.earth {
  border-color: rgba(215, 180, 106, 0.45);
  background: linear-gradient(180deg, var(--gold-soft), rgba(255,255,255,0.02));
}

.world img {
  width: min(62%, 20vh, 170px);
  height: auto;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 50%;
  margin-bottom: 0.4rem;
  flex: 0 1 auto;
  animation: float 5.5s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

.world h3 {
  margin: 0;
  font-size: clamp(0.7rem, 1.5vw, 0.95rem);
  font-weight: 600;
}

.world .g-label {
  margin: 0.1rem 0 0.25rem;
  font-size: clamp(0.55rem, 1.1vw, 0.7rem);
  color: var(--muted);
  letter-spacing: 0.04em;
}

.world .kg {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 700;
  color: var(--ink);
  min-height: 1.2em;
  letter-spacing: -0.01em;
}

.world.moon .kg {
  color: #c5d0e0;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes twinkle {
  from { opacity: 0.7; }
  to { opacity: 1; }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .top {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand live"
      "controls controls";
  }

  .brand-block { grid-area: brand; }
  .live { grid-area: live; text-align: right; }
  .controls { grid-area: controls; justify-content: flex-start; }

  .hint {
    white-space: normal;
  }
}

@media (max-width: 640px) {
  body {
    overflow: auto;
  }

  .shell {
    height: auto;
    min-height: 100dvh;
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
    aspect-ratio: auto;
  }

  .world img {
    width: min(70%, 140px);
  }
}