:root {
  --bg-top: #06111f;
  --bg-bottom: #02050a;
  --panel: rgba(7, 18, 32, 0.82);
  --panel-border: rgba(128, 194, 255, 0.25);
  --text-main: #eaf6ff;
  --text-soft: #9ec3df;
  --accent: #79f0ff;
  --accent-strong: #ffcc66;
  --danger: #ff7b7b;
  --shadow: rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(40, 120, 160, 0.28), transparent 35%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.game-shell {
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 20px;
}

.title-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-soft);
  font-size: 0.78rem;
}

h1, h2, p {
  margin: 0;
}

h1 {
  font-size: clamp(1.9rem, 3.5vw, 3rem);
}

h2 {
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
}

.stage-panel,
.card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: 0 16px 40px var(--shadow);
}

.stage-panel {
  padding: 14px;
}

#gameCanvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  background:
    radial-gradient(circle at 50% 0%, rgba(117, 198, 255, 0.08), transparent 35%),
    linear-gradient(180deg, #0a1830, #02050b);
}

.info-panel {
  display: grid;
  gap: 16px;
}

.card {
  padding: 18px;
}

.card p {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 7px 0;
  color: var(--text-soft);
}

.card strong {
  color: var(--text-main);
  text-align: right;
}

.secondary-button {
  border: 1px solid rgba(121, 240, 255, 0.5);
  background: rgba(7, 30, 51, 0.85);
  color: var(--text-main);
  padding: 12px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
}

.secondary-button:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.hidden {
  display: none !important;
}

.cloud-card {
  display: grid;
  gap: 10px;
}

.cloud-input {
  width: 100%;
  border: 1px solid rgba(121, 240, 255, 0.35);
  background: rgba(3, 12, 23, 0.72);
  color: var(--text-main);
  border-radius: 12px;
  padding: 10px 12px;
  font: 600 0.95rem "Trebuchet MS", "Segoe UI", sans-serif;
}

.cloud-input::placeholder {
  color: rgba(158, 195, 223, 0.72);
}

.cloud-actions,
.leaderboard-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.leaderboard-card {
  display: grid;
  gap: 10px;
}

.leaderboard-list {
  display: grid;
  gap: 8px;
  color: var(--text-soft);
}

.leaderboard-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid rgba(121, 240, 255, 0.16);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.leaderboard-row strong {
  color: var(--text-main);
  text-align: left;
}

.dev-coins-input {
  position: fixed;
  left: 50%;
  top: 54%;
  transform: translateX(-50%);
  width: 180px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(121, 240, 255, 0.45);
  background: rgba(7, 18, 32, 0.95);
  color: var(--text-main);
  font: 600 16px "Trebuchet MS", "Segoe UI", sans-serif;
  text-align: center;
  z-index: 20;
}

.dev-coins-input.hidden {
  display: none;
}

@media (max-width: 1040px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .info-panel {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
}

@media (max-width: 640px) {
  .game-shell {
    padding: 12px;
  }

  .title-bar {
    flex-direction: column;
    align-items: stretch;
  }
}