:root {
  --bg: #07111f;
  --bg-soft: rgba(10, 20, 38, 0.82);
  --line: rgba(167, 212, 255, 0.16);
  --text: #eef7ff;
  --muted: #9ab0c7;
  --accent: #8affcf;
}

* {
  box-sizing: border-box;
}
 
html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "Segoe UI", "Apple SD Gothic Neo", sans-serif;
  background:
    radial-gradient(circle at top, rgba(88, 180, 255, 0.14), transparent 25%),
    radial-gradient(circle at bottom, rgba(99, 255, 199, 0.1), transparent 30%),
    var(--bg);
  color: var(--text);
}

button,
input {
  font: inherit;
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

.screen {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 5;
  background: rgba(4, 8, 18, 0.52);
  backdrop-filter: blur(10px);
}

.panel,
.hud-card,
.leaderboard,
.message {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(14px);
}

.panel {
  width: min(640px, calc(100vw - 32px));
  padding: 28px;
  border-radius: 24px;
}

.panel h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.2rem);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.description,
.hint {
  color: var(--muted);
}

.login-form {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.login-form input {
  flex: 1;
  min-width: 0;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.login-form button {
  padding: 14px 20px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, #8affcf, #60b9ff);
  color: #03101c;
  font-weight: 700;
  cursor: pointer;
}

.class-picker {
  margin-top: 20px;
}

.class-picker h2,
.help-panel h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.cell-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.cell-option {
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.cell-option:hover,
.cell-option.selected {
  transform: translateY(-2px);
  border-color: rgba(138, 255, 207, 0.55);
  background: rgba(138, 255, 207, 0.08);
}

.cell-option h3,
.cell-option p {
  margin: 0;
}

.cell-option p {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.45;
  font-size: 0.92rem;
}

.cell-meta {
  margin-top: 8px;
  color: var(--accent);
  font-size: 0.85rem;
}

.help-panel {
  margin-top: 20px;
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.help-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.help-line + .help-line {
  margin-top: 8px;
}

.hud {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 3;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hud-card,
.leaderboard,
.message {
  border-radius: 18px;
  padding: 14px 16px;
}

.hud-line,
.leader-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.hud-line + .hud-line,
.leader-line + .leader-line {
  margin-top: 8px;
}

.meter-block + .meter-block {
  margin-top: 12px;
}

.meter {
  margin-top: 8px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.meter.effect {
  background: rgba(255, 205, 112, 0.12);
}

.meter-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #8affcf, #60b9ff);
  transition: width 120ms linear;
}

.meter.effect .meter-fill {
  background: linear-gradient(90deg, #ffcf70, #ffdca6);
}

.leaderboard {
  position: fixed;
  top: 18px;
  right: 18px;
  width: min(280px, calc(100vw - 36px));
  z-index: 3;
}

.minimap {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 3;
  padding: 10px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(14px);
}

#minimapCanvas {
  display: block;
  width: 180px;
  height: 180px;
  border-radius: 12px;
}

.leaderboard h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.message {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 3;
}

.hidden {
  display: none;
}

@media (max-width: 700px) {
  .login-form {
    flex-direction: column;
  }

  .cell-options {
    grid-template-columns: 1fr;
  }

  .leaderboard {
    top: auto;
    bottom: 220px;
    right: 18px;
  }

  .message {
    left: 18px;
    right: 18px;
    transform: none;
  }
}