@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@300;500;700&display=swap');

:root {
  --bg: #050814;
  --bg-light: #0a1020;
  --bg-card: rgba(10, 16, 32, 0.92);
  --primary: #7dd3fc;
  --accent: #c9a84c;
  --accent-light: #e8d5a3;
  --accent-dark: #8b7340;
  --text: #f0e6d2;
  --text-dim: #8899aa;
  --danger: #c94c4c;
  --success: #4cc98b;
  --gold: #ffd700;
  --silver: #c0c0c0;
  --bronze: #cd7f32;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'Courier New', Courier, monospace;
  font-size: 16px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

#gameCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  display: block;
  pointer-events: none;
}

#uiLayer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: auto;
  overflow: hidden;
}

.screen {
  position: fixed;
  inset: 0;
  display: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 10;
  overflow: hidden;
}

.screen.active {
  display: flex;
  opacity: 1;
}

#menuScreen {
  align-items: center;
  justify-content: center;
}

.menu-layout {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
  padding: 20px;
  height: 100%;
  position: relative;
}

.menu-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
  justify-content: center;
  height: 100%;
  max-width: 360px;
  margin: 0 auto;
}

.logo-area {
  text-align: center;
  flex-shrink: 0;
}

.serpent-icon {
  font-size: 3rem;
  margin-bottom: 8px;
  animation: serpentFloat 3s ease-in-out infinite;
  filter: drop-shadow(0 0 20px rgba(125, 211, 252, 0.4));
}

@keyframes serpentFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.game-title {
  font-size: 2.4rem;
  font-weight: bold;
  color: var(--primary);
  letter-spacing: 6px;
  text-shadow: 0 0 25px rgba(125, 211, 252, 0.5), 0 0 50px rgba(125, 211, 252, 0.2);
  line-height: 1;
}

.game-subtitle {
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--accent);
  letter-spacing: 8px;
  margin-top: 4px;
  text-shadow: 0 0 15px rgba(201, 168, 76, 0.4);
}

.game-tagline {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 8px;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.menu-sidebar {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 220px;
  z-index: 15;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 14px;
  padding: 16px;
  backdrop-filter: blur(12px);
  width: 100%;
}

.sidebar-card h3 {
  font-size: 0.8rem;
  color: var(--accent);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.sidebar-card .lb-entry {
  padding: 6px 8px;
  font-size: 0.85rem;
  gap: 8px;
}

.sidebar-card .lb-rank {
  width: 26px;
  font-size: 1rem;
}

.sidebar-card .lb-name {
  font-size: 0.82rem;
}

.sidebar-card .lb-score {
  font-size: 0.85rem;
}

.menu-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 360px;
}

.menu-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 10px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  width: 100%;
  text-align: left;
  overflow: hidden;
}

.menu-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0;
  transition: var(--transition);
}

.menu-btn:hover {
  border-color: var(--accent);
  background: rgba(201, 168, 76, 0.08);
  transform: translateX(4px) scale(1.02);
  box-shadow: 0 0 20px rgba(201, 168, 76, 0.12);
}

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

.menu-btn:active {
  transform: translateX(4px) scale(0.97);
}

.menu-btn.primary {
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.18), rgba(201, 168, 76, 0.04));
  border-color: var(--accent);
  font-weight: bold;
  font-size: 1.05rem;
  padding: 14px 18px;
}

.menu-btn.primary:hover {
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.3), rgba(201, 168, 76, 0.08));
  box-shadow: 0 0 30px rgba(201, 168, 76, 0.2);
}

.menu-btn.danger {
  border-color: var(--danger);
  color: var(--danger);
  margin-top: 10px;
}

.menu-btn.danger:hover {
  background: rgba(201, 76, 76, 0.08);
}

.btn-icon {
  font-size: 1.1rem;
  width: 28px;
  text-align: center;
  flex-shrink: 0;
}

.btn-text {
  flex: 1;
}

.btn-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: rgba(201, 168, 76, 0.12);
  border: 1px solid var(--accent-dark);
  border-radius: 4px;
  color: var(--accent-light);
  flex-shrink: 0;
}

.menu-footer {
  text-align: center;
  margin-top: 10px;
  flex-shrink: 0;
}

.version {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.credits {
  font-size: 0.7rem;
  color: var(--accent-dark);
  text-decoration: none;
  transition: var(--transition);
}

.credits:hover {
  color: var(--accent);
}

.screen-header {
  width: 100%;
  max-width: 520px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-top: 20px;
  flex-shrink: 0;
}

.screen-header h2 {
  font-size: 1.15rem;
  color: var(--accent);
  text-shadow: 0 0 12px rgba(201, 168, 76, 0.35);
  flex: 1;
  text-align: center;
  letter-spacing: 2px;
}

.back-btn {
  background: transparent;
  border: 1px solid var(--accent-dark);
  color: var(--accent);
  width: 38px;
  height: 38px;
  border-radius: 8px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.back-btn:hover {
  background: rgba(201, 168, 76, 0.12);
  transform: translateX(-3px);
  border-color: var(--accent);
}

#difficultyScreen, #themesScreen, #achievementsScreen, #settingsScreen, #howtoScreen {
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 16px;
  overflow-y: auto;
}

.selector-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  width: 100%;
  max-width: 520px;
}

.select-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 12px;
  color: var(--text);
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  text-align: left;
  overflow: hidden;
}

.select-card:hover {
  border-color: var(--accent);
  background: rgba(201, 168, 76, 0.06);
  transform: translateX(4px);
}

.select-card.selected {
  border-color: var(--accent);
  background: rgba(201, 168, 76, 0.12);
  box-shadow: 0 0 15px rgba(201, 168, 76, 0.1);
}

.select-card.selected::after {
  content: "✓";
  margin-left: auto;
  color: var(--success);
  font-weight: bold;
  font-size: 1.1rem;
}

.card-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.card-title {
  font-weight: bold;
  color: var(--accent);
  font-size: 1rem;
  display: block;
}

.card-desc {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: block;
  margin-top: 2px;
}

.leaderboard-list {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lb-entry {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 8px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.lb-rank {
  font-size: 1.1rem;
  width: 30px;
  text-align: center;
  flex-shrink: 0;
}

.lb-rank.gold { color: var(--gold); text-shadow: 0 0 8px rgba(255, 215, 0, 0.4); }
.lb-rank.silver { color: var(--silver); text-shadow: 0 0 8px rgba(192, 192, 192, 0.3); }
.lb-rank.bronze { color: var(--bronze); text-shadow: 0 0 8px rgba(205, 127, 50, 0.3); }

.lb-name {
  flex: 1;
  font-weight: bold;
  color: var(--text);
  font-size: 0.9rem;
}

.lb-score {
  color: var(--accent);
  font-weight: bold;
  font-size: 0.95rem;
}

.empty-msg {
  text-align: center;
  color: var(--text-dim);
  padding: 20px 10px;
  font-size: 0.85rem;
}

.achievements-grid {
  width: 100%;
  max-width: 520px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.ach-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 8px;
  backdrop-filter: blur(10px);
}

.ach-card.unlocked {
  border-color: var(--accent);
  background: rgba(201, 168, 76, 0.08);
}

.ach-card.locked {
  opacity: 0.45;
}

.ach-icon {
  font-size: 1.6rem;
  width: 38px;
  text-align: center;
  flex-shrink: 0;
}

.ach-title {
  font-weight: bold;
  color: var(--accent);
  font-size: 0.88rem;
}

.ach-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.ach-status {
  font-size: 1rem;
  flex-shrink: 0;
}

.settings-list {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 8px;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.setting-row:hover {
  border-color: var(--accent);
}

.setting-name {
  color: var(--text);
  font-size: 0.9rem;
}

.setting-row input {
  display: none;
}

.toggle {
  width: 44px;
  height: 22px;
  background: var(--bg);
  border: 1px solid var(--accent-dark);
  border-radius: 11px;
  position: relative;
  transition: var(--transition);
  flex-shrink: 0;
}

.toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: var(--transition);
}

input:checked + .toggle {
  background: rgba(201, 168, 76, 0.2);
  border-color: var(--accent);
}

input:checked + .toggle::after {
  left: 24px;
  background: var(--accent);
}

.howto-content {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.howto-section {
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 10px;
  padding: 14px;
  backdrop-filter: blur(10px);
}

.howto-section h3 {
  color: var(--accent);
  margin-bottom: 6px;
  font-size: 0.95rem;
  letter-spacing: 1px;
}

.howto-section p {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 4px;
}

.hud {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 10px 14px;
  z-index: 20;
  pointer-events: none;
}

.hud.hidden {
  display: none;
}

.hud-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: auto;
}

.hud-left, .hud-right {
  display: flex;
  gap: 6px;
}

.hud-stat {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(5, 8, 20, 0.75);
  border: 1px solid var(--accent-dark);
  border-radius: 6px;
  padding: 4px 8px;
  backdrop-filter: blur(10px);
}

.stat-value {
  font-weight: bold;
  color: var(--accent);
  font-size: 0.9rem;
  min-width: 16px;
  text-align: center;
}

.stat-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.level-stat .stat-value {
  color: var(--primary);
}

.combo-stat {
  animation: comboPulse 0.5s ease-in-out;
  border-color: var(--accent);
  background: rgba(201, 168, 76, 0.12);
}

.combo-stat.hidden {
  display: none;
}

@keyframes comboPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

.hud-btn {
  background: rgba(5, 8, 20, 0.75);
  border: 1px solid var(--accent-dark);
  border-radius: 6px;
  color: var(--accent);
  font-size: 0.9rem;
  width: 32px;
  height: 32px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hud-btn:hover {
  border-color: var(--accent);
  background: rgba(201, 168, 76, 0.12);
}

.overlay-screen {
  position: fixed;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 20, 0.94);
  z-index: 30;
  opacity: 0;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(10px);
  padding: 16px;
}

.overlay-screen.active {
  display: flex;
  opacity: 1;
}

.overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 360px;
  animation: overlayEnter 0.4s ease-out;
}

@keyframes overlayEnter {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.overlay-content h2 {
  color: var(--accent);
  text-shadow: 0 0 15px rgba(201, 168, 76, 0.35);
  font-size: 1.2rem;
  text-align: center;
  letter-spacing: 2px;
}

.gameover-title {
  font-size: 1.1rem !important;
  color: var(--danger) !important;
  text-shadow: 0 0 15px rgba(201, 76, 76, 0.35) !important;
}

.gameover-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 100%;
  margin: 6px 0;
}

.go-stat {
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: 8px;
  padding: 8px;
  text-align: center;
}

.go-label {
  display: block;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 2px;
}

.go-value {
  display: block;
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--accent);
}

.name-entry {
  width: 100%;
  text-align: center;
  animation: nameEnter 0.5s ease-out;
}

.name-entry.hidden {
  display: none;
}

@keyframes nameEnter {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.name-entry p {
  color: var(--success);
  font-size: 0.95rem;
  margin-bottom: 8px;
  text-shadow: 0 0 10px rgba(76, 201, 139, 0.25);
}

.name-entry input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: 8px;
  outline: none;
}

.name-entry input:focus {
  box-shadow: 0 0 12px rgba(201, 168, 76, 0.15);
}

.gameover-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}

.mobile-controls {
  position: fixed;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 25;
}

.mobile-controls.hidden {
  display: none;
}

.d-pad {
  display: grid;
  grid-template-columns: 52px 52px 52px;
  grid-template-rows: 52px 52px 52px;
  gap: 3px;
}

.d-btn {
  width: 52px;
  height: 52px;
  background: rgba(5, 8, 20, 0.6);
  border: 1px solid var(--accent-dark);
  border-radius: 10px;
  color: var(--accent);
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.d-btn:hover, .d-btn:active {
  background: rgba(201, 168, 76, 0.2);
  border-color: var(--accent);
  transform: scale(0.95);
}

.d-up { grid-column: 2; grid-row: 1; }
.d-left { grid-column: 1; grid-row: 2; }
.d-center { grid-column: 2; grid-row: 2; font-size: 0.65rem; opacity: 0.4; cursor: default; pointer-events: none; }
.d-right { grid-column: 3; grid-row: 2; }
.d-down { grid-column: 2; grid-row: 3; }

#toastContainer {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 5px;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 7px 16px;
  color: var(--accent);
  font-size: 0.82rem;
  backdrop-filter: blur(10px);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.2s forwards;
  white-space: nowrap;
  text-align: center;
  box-shadow: 0 0 15px rgba(201, 168, 76, 0.15);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-6px); }
}

@media (min-width: 600px) {
  .selector-grid { grid-template-columns: 1fr 1fr; }
  .selector-grid.themes { grid-template-columns: 1fr 1fr; }
  .achievements-grid { grid-template-columns: 1fr 1fr; }
  .gameover-stats { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 768px) {
  .menu-sidebar { width: 180px; }
}

@media (max-width: 599px) {
  .menu-layout {
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 12px;
    max-height: none;
    overflow-y: auto;
  }
  .menu-main {
    justify-content: flex-start;
    gap: 10px;
  }
  .menu-sidebar {
    position: relative;
    top: auto;
    right: auto;
    width: 100%;
    max-width: 320px;
    order: 3;
    max-height: none;
  }
  .sidebar-card {
    padding: 10px 12px;
  }
  .game-title { font-size: 1.8rem; }
  .game-subtitle { font-size: 1.2rem; }
  .serpent-icon { font-size: 2.4rem; }
  .menu-btn { padding: 9px 14px; font-size: 0.85rem; }
  .menu-nav { max-width: 100%; }
}

@media (max-height: 640px) {
  .serpent-icon { font-size: 2.2rem; }
  .game-title { font-size: 1.6rem; }
  .game-subtitle { font-size: 1.1rem; }
  .menu-btn { padding: 8px 12px; font-size: 0.85rem; }
  .menu-sidebar { display: none; }
}

@media (max-height: 480px) {
  .menu-nav { gap: 4px; }
  .menu-btn { padding: 6px 10px; font-size: 0.8rem; }
  .game-tagline { display: none; }
  .menu-footer { display: none; }
}

@media (hover: none) and (pointer: coarse) {
  .menu-btn:hover { transform: none; background: var(--bg-card); }
  .menu-btn:active { transform: scale(0.97); background: rgba(201, 168, 76, 0.12); }
  .select-card:hover { transform: none; }
  .d-btn:hover { transform: none; }
}

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent-dark); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }