:root {
  --bg-gradient-start: #050816;
  --bg-gradient-end: #0f172a;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --accent-strong: #0ea5e9;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --card-bg: rgba(15, 23, 42, 0.85);
  --border-soft: rgba(148, 163, 184, 0.3);
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.7);
  --radius-lg: 18px;
  --radius-pill: 999px;
  --transition-fast: 0.18s ease-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1e293b 0, #020617 55%, #000 100%);
  color: var(--text-main);
  overflow: hidden;
}

.background-overlay {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(56, 189, 248, 0.12), transparent 50%),
    radial-gradient(circle at 80% 100%, rgba(34, 197, 94, 0.12), transparent 50%);
  opacity: 0.9;
  pointer-events: none;
  z-index: -1;
}

.app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  gap: 24px;
}

.app-header {
  text-align: center;
  margin-bottom: 4px;
}

.title {
  font-size: clamp(2.4rem, 3.2vw, 3.3rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 6px;
  background: linear-gradient(120deg, #f9fafb, #e5e7eb, #38bdf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.card {
  width: min(420px, 100%);
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
  padding: 22px 22px 20px;
  transform-origin: center;
  animation: fadeInUp 0.4s var(--transition-fast) both;
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.card p {
  margin: 0 0 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.menu-button {
  position: relative;
  width: 100%;
  padding: 11px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: radial-gradient(
    circle at top left,
    rgba(15, 23, 42, 0.7),
    rgba(15, 23, 42, 0.95)
  );
  color: var(--text-main);
  text-align: center;
  font-size: 0.95rem;
  cursor: pointer;
  outline: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition:
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.menu-button::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    circle at top left,
    rgba(148, 163, 184, 0.45),
    transparent 60%
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.menu-button.primary {
  border-color: rgba(56, 189, 248, 0.8);
  background:
    linear-gradient(135deg, var(--accent-soft), rgba(15, 23, 42, 0.95)),
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.2), transparent 60%);
  box-shadow: 0 10px 28px rgba(56, 189, 248, 0.35);
}

.menu-button:hover {
  transform: translateY(-1px);
  border-color: var(--accent-strong);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.85);
}

.menu-button.primary:hover {
  box-shadow: 0 14px 38px rgba(56, 189, 248, 0.55);
}

.menu-button:active {
  transform: translateY(0);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.7);
}

.menu-button:hover::before {
  opacity: 1;
}

.app-footer {
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.hint {
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.45);
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.setting-row span {
  flex: 1;
}

.setting-row input[type="range"] {
  flex: 1.2;
}

.setting-row select {
  flex: 0.9;
}

input[type="range"],
select,
input[type="checkbox"] {
  accent-color: var(--accent-strong);
}

.offline-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.field input[type="text"] {
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-main);
  padding: 7px 10px;
  font-size: 0.9rem;
}

.field input[type="text"]::placeholder {
  color: rgba(148, 163, 184, 0.9);
}

.role-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.role-label {
  font-weight: 500;
  margin-right: 4px;
}

.role-option {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.5);
}

.role-hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.offline-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.error-text {
  min-height: 1em;
  margin: 2px 0 0;
  font-size: 0.78rem;
  color: #f97373;
}

.game-card {
  gap: 10px;
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

#game-player-label {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.screen.hidden {
  display: none;
}

.fullscreen-screen {
  position: fixed;
  inset: 0;
  padding: 12px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: radial-gradient(circle at top, #020617 0, #020617 55%, #000 100%);
  z-index: 20;
}

.fullscreen-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
}

.hud-left h2 {
  margin: 0;
  font-size: 1.1rem;
}

.hud-left p {
  margin: 2px 0 0;
  color: var(--text-muted);
}

.hud-center {
  text-align: center;
  min-width: 160px;
}

.hud-right {
  min-width: 90px;
}

#game-timer-label,
#game-alive-label {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-main);
  margin-inline: 2px;
  font-size: 0.8rem;
}

#game-canvas {
  flex: 1;
  width: 100%;
  height: calc(100% - 40px);
  border-radius: 14px;
  background: #020617;
  border: 1px solid rgba(15, 23, 42, 0.9);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.9);
  display: block;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.lobby-card {
  width: min(460px, 100%);
}

.join-code-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(56, 189, 248, 0.35);
  background: rgba(8, 15, 30, 0.85);
}

.join-code-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.join-code-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

#lobby-code {
  flex: 1;
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  color: #f8fafc;
}

.copy-button {
  width: auto;
  padding: 8px 14px;
  flex-shrink: 0;
}

.join-code-link {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  word-break: break-all;
}

.lobby-players ul {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lobby-player {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.9);
  font-size: 0.88rem;
}

.lobby-player-name {
  color: var(--text-main);
}

.lobby-player-role {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.lobby-player-role.seeker {
  color: #facc15;
  border-color: rgba(250, 204, 21, 0.55);
}

.lobby-player-role.hider {
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.5);
}

.menu-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

#join-code {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 600;
}

@media (max-width: 480px) {
  .app {
    padding-inline: 12px;
  }

  .card {
    padding-inline: 18px;
  }
}