:root {
  color-scheme: dark;
  --bg: #070b12;
  --surface: rgba(16, 24, 38, 0.78);
  --line: rgba(126, 224, 255, 0.18);
  --text: #e8eef7;
  --muted: #8ea0b8;
  --accent: #7ee0ff;
  --accent-strong: #3d9cf0;
  --danger: #ff5c8a;
  --success: #7fd962;
  --warning: #ffcc66;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% -10%, rgba(61, 156, 240, 0.28), transparent 42%),
    radial-gradient(circle at 90% 0%, rgba(255, 92, 138, 0.16), transparent 36%),
    var(--bg);
  color: var(--text);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #b8f3ff; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 11, 18, 0.72);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 2;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.95rem;
  color: var(--text);
}

nav { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.eyebrow {
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  font-size: 0.75rem;
  margin: 0 0 0.4rem;
}

.hero { text-align: center; padding: 2.5rem 0 1rem; }
.hero h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  margin: 0 0 0.6rem;
  letter-spacing: -0.04em;
}
.hero p { color: var(--muted); font-size: 1.05rem; }

.actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.button {
  display: inline-block;
  border: 1px solid var(--line);
  background: rgba(16, 24, 38, 0.9);
  color: var(--text);
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
}

.button.primary {
  background: linear-gradient(180deg, #9aefff, var(--accent-strong));
  border-color: transparent;
  color: #041018;
  font-weight: 700;
}

.button:disabled { opacity: 0.45; cursor: not-allowed; }

.link-button {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  padding: 0;
}

.form-card, .leaderboard {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  backdrop-filter: blur(12px);
}

.form-card {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
}

label { display: grid; gap: 0.35rem; color: var(--muted); }

input {
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #070b12;
  color: var(--text);
  font: inherit;
}

.flash-list { list-style: none; padding: 0; margin: 0 0 1.25rem; }
.flash { padding: 0.75rem 1rem; border-radius: 10px; margin-bottom: 0.5rem; }
.flash-error { background: rgba(255, 92, 138, 0.12); border: 1px solid var(--danger); }
.flash-success { background: rgba(127, 217, 98, 0.12); border: 1px solid var(--success); }
.flash-warning { background: rgba(255, 204, 102, 0.12); border: 1px solid var(--warning); }

.leaderboard { width: 100%; border-collapse: collapse; overflow: hidden; }
.leaderboard th, .leaderboard td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.leaderboard th { color: var(--muted); font-weight: 600; }

.inline { display: inline; margin: 0; }

body.play-page { overflow: hidden; }
body.play-page .container {
  max-width: none;
  height: calc(100vh - 58px);
  padding: 0.75rem;
}

.play-panel {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0.6rem;
}

.hud {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  backdrop-filter: blur(12px);
}

.hud-label {
  display: block;
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

#arena {
  width: 100%;
  height: 100%;
  min-height: 280px;
  border-radius: 16px;
  border: 1px solid var(--line);
  touch-action: none;
  cursor: crosshair;
  background: #070b12;
}

.status { min-height: 1.25rem; margin: 0; color: var(--muted); }

@media (max-width: 640px) {
  .site-header { padding: 0.7rem 0.85rem; }
  body.play-page .container { height: calc(100vh - 92px); }
  .hud { gap: 0.65rem; }
}