/* ===================================================
   NOVA DRIFT — Main Stylesheet
   =================================================== */

:root {
  --bg:          #050510;
  --bg2:         #0a0a1a;
  --accent:      #00f0ff;
  --accent2:     #ff3cac;
  --accent3:     #ffe066;
  --green:       #39ff14;
  --purple:      #a259ff;
  --glass:       rgba(0, 240, 255, 0.06);
  --glass-border:rgba(0, 240, 255, 0.18);
  --text:        #e8f4ff;
  --text-dim:    #5a7a99;
  --font-game:   'Orbitron', sans-serif;
  --font-body:   'Rajdhani', sans-serif;
  --shadow-cyan: 0 0 20px rgba(0,240,255,0.45), 0 0 60px rgba(0,240,255,0.15);
  --shadow-pink: 0 0 20px rgba(255,60,172,0.5),  0 0 60px rgba(255,60,172,0.15);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

/* ---- Screens ---- */
.screen {
  position: fixed; inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
}
.screen.active { display: flex; }

/* ---- Starfield BG ---- */
.stars-bg {
  position: absolute; inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.star {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  animation: twinkle var(--d) ease-in-out infinite alternate;
  opacity: var(--o);
}
@keyframes twinkle {
  from { opacity: var(--o); transform: scale(1); }
  to   { opacity: calc(var(--o) * 0.2); transform: scale(0.5); }
}

/* ======================================
   MENU SCREEN
   ====================================== */
#screen-menu { background: radial-gradient(ellipse at 50% 40%, #0d0d2b 0%, #050510 70%); }

.menu-content {
  position: relative; z-index: 2;
  display: flex; flex-direction: column;
  align-items: center; gap: 28px;
  padding: 20px;
  width: 100%; max-width: 420px;
}

/* Logo */
.logo-wrap { position: relative; text-align: center; }
.logo-glow {
  position: absolute;
  width: 260px; height: 260px;
  background: radial-gradient(circle, rgba(0,240,255,0.18) 0%, transparent 70%);
  top: 50%; left: 50%; transform: translate(-50%, -50%);
  border-radius: 50%;
  animation: pulseGlow 3s ease-in-out infinite;
}
@keyframes pulseGlow {
  0%,100% { transform: translate(-50%,-50%) scale(1);   opacity: 1; }
  50%      { transform: translate(-50%,-50%) scale(1.15); opacity: 0.7; }
}

.logo-title {
  font-family: var(--font-game);
  font-size: clamp(52px, 14vw, 86px);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: 6px;
  color: #fff;
  text-shadow: var(--shadow-cyan);
  position: relative; z-index: 1;
}
.logo-title span {
  color: var(--accent);
  display: block;
  font-size: clamp(38px, 10vw, 62px);
  letter-spacing: 14px;
  text-shadow: var(--shadow-cyan);
}
.logo-sub {
  font-family: var(--font-game);
  font-size: 11px;
  letter-spacing: 8px;
  color: var(--accent2);
  text-shadow: var(--shadow-pink);
  margin-top: 10px;
}

/* Menu Stats */
.menu-stats {
  display: flex; gap: 16px; width: 100%;
}
.stat-card {
  flex: 1;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 14px 10px;
  text-align: center;
  backdrop-filter: blur(6px);
}
.stat-label {
  display: block;
  font-family: var(--font-game);
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.stat-val {
  display: block;
  font-family: var(--font-game);
  font-size: 26px;
  font-weight: 700;
  color: var(--accent);
  text-shadow: var(--shadow-cyan);
}

/* Buttons */
.btn-primary, .btn-secondary {
  width: 100%;
  padding: 16px 24px;
  border: none;
  border-radius: 10px;
  font-family: var(--font-game);
  font-size: 15px;
  letter-spacing: 3px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, #00c8d4, #00f0ff);
  color: #050510;
  font-weight: 700;
  box-shadow: var(--shadow-cyan);
}
.btn-primary::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.25));
  opacity: 0;
  transition: opacity 0.2s;
}
.btn-primary:hover::before, .btn-primary:active::before { opacity: 1; }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text);
  letter-spacing: 2px;
}
.btn-secondary:hover, .btn-secondary:active {
  background: var(--glass);
  border-color: var(--accent);
  color: var(--accent);
}

.version-tag {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 2px;
  margin-top: -10px;
}
/* Back button — no arrow, perfectly centred */
.btn-back-centered {
  letter-spacing: 5px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* ======================================
   HOW TO PLAY
   ====================================== */
#screen-how {
  background: var(--bg);
  overflow-y: auto;
  padding: 20px;
  align-items: stretch;
}
.htp-content {
  max-width: 420px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 12px 32px;
  display: flex; flex-direction: column;
  align-items: center;
  gap: 14px;
}
.htp-title {
  font-family: var(--font-game);
  font-size: 28px;
  letter-spacing: 6px;
  text-align: center;
  width: 100%;
  display: block;
  margin: 0 auto;
  color: var(--accent);
  text-shadow: var(--shadow-cyan);
}
.htp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  width: 100%;
}
.htp-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 14px 10px;
  text-align: center;
}
.htp-icon {
  width: 36px; height: 36px;
  margin: 0 auto 8px;
  display: flex; align-items: center; justify-content: center;
  filter: drop-shadow(0 0 5px rgba(0,240,255,0.5));
}
.htp-icon svg { width: 36px; height: 36px; }
.htp-card h3 {
  font-family: var(--font-game);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 6px;
}
.htp-card p {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.4;
}

/* ======================================
   GAME HUD
   ====================================== */
#screen-game {
  display: none;
  background: transparent;
}
#screen-game.active { display: flex; }

#game-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
}

/* HUD */
.hud {
  position: absolute; top: 0; left: 0; right: 0;
  z-index: 20;
  display: flex; align-items: center;
  padding: 12px 16px 8px;
  background: linear-gradient(to bottom, rgba(5,5,16,0.85), transparent);
  pointer-events: none;
}
.hud-left, .hud-right, .hud-center {
  display: flex; flex-direction: column;
}
.hud-left { align-items: flex-start; flex: 1; }
.hud-center { align-items: center; flex: 0 0 auto; }
.hud-right { align-items: flex-end; flex: 1; pointer-events: all; }

.hud-score-label, .hud-wave-label {
  font-family: var(--font-game);
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--text-dim);
}
.hud-score {
  font-family: var(--font-game);
  font-size: clamp(22px, 6vw, 32px);
  font-weight: 700;
  color: var(--accent3);
  text-shadow: 0 0 14px rgba(255,224,102,0.6);
  line-height: 1;
  transition: transform 0.1s;
}
.hud-wave {
  font-family: var(--font-game);
  font-size: clamp(18px, 5vw, 26px);
  font-weight: 700;
  color: var(--accent2);
  text-shadow: var(--shadow-pink);
}

.lives-row {
  display: flex; gap: 6px;
  margin-bottom: 4px;
}
.life-icon {
  font-size: 18px;
  filter: drop-shadow(0 0 6px var(--accent));
  transition: all 0.3s;
}
.life-icon.lost { opacity: 0.2; filter: none; }

.hud-pause-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text);
  font-size: 16px;
  width: 36px; height: 36px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  pointer-events: all;
}
.hud-pause-btn:active { background: rgba(0,240,255,0.2); }

/* Shield Bar */
.shield-bar-wrap {
  position: absolute;
  top: 60px; left: 0; right: 0;
  z-index: 20;
  padding: 0 16px;
  pointer-events: none;
  display: none;
}
.shield-bar-wrap.visible { display: block; }
.shield-bar-inner {
  height: 4px;
  background: linear-gradient(90deg, #00f0ff, #a259ff);
  border-radius: 2px;
  width: 100%;
  transition: width 0.3s;
  box-shadow: 0 0 10px rgba(0,240,255,0.6);
}
.shield-bar-label {
  font-family: var(--font-game);
  font-size: 8px;
  letter-spacing: 3px;
  color: var(--accent);
  margin-top: 2px;
}

/* ======================================
   MOBILE CONTROLS — drawn on canvas, no HTML elements needed
   Bomb button + drag indicator rendered in game.js drawMobileUI()
   ====================================== */

/* ======================================
   OVERLAY SCREENS (Pause / Wave / GameOver)
   ====================================== */
.overlay-screen {
  background: rgba(5,5,16,0.82);
  backdrop-filter: blur(10px);
  z-index: 50;
}

.overlay-box {
  background: linear-gradient(145deg, rgba(10,10,30,0.95), rgba(5,5,16,0.98));
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 36px 28px;
  width: calc(100% - 40px);
  max-width: 380px;
  display: flex; flex-direction: column;
  align-items: center; gap: 18px;
  box-shadow: 0 0 60px rgba(0,240,255,0.08), inset 0 1px 0 rgba(255,255,255,0.05);
}

.overlay-box h2 {
  font-family: var(--font-game);
  font-size: 24px;
  letter-spacing: 6px;
  color: var(--text);
}

/* Pause icon wrapper */
.overlay-icon-wrap {
  color: var(--accent);
  filter: drop-shadow(0 0 8px var(--accent));
}

/* Wave Clear */
.wave-clear-box { gap: 12px; }
.wave-clear-badge {
  font-family: var(--font-game);
  font-size: 11px;
  letter-spacing: 6px;
  color: var(--green);
  text-shadow: 0 0 14px var(--green);
  background: rgba(57,255,20,0.1);
  border: 1px solid rgba(57,255,20,0.3);
  border-radius: 20px;
  padding: 6px 16px;
}
.wave-clear-num {
  font-family: var(--font-game);
  font-size: 72px;
  font-weight: 900;
  color: var(--accent3);
  text-shadow: 0 0 30px rgba(255,224,102,0.6);
  line-height: 1;
}
.wave-clear-bonus {
  font-family: var(--font-game);
  font-size: 16px;
  color: var(--green);
  text-shadow: 0 0 14px var(--green);
  letter-spacing: 2px;
}
.wave-next-label {
  font-family: var(--font-game);
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--text-dim);
}
.wave-countdown {
  font-family: var(--font-game);
  font-size: 52px;
  font-weight: 900;
  color: var(--accent2);
  text-shadow: var(--shadow-pink);
  animation: countAnim 1s ease-in-out infinite alternate;
}
@keyframes countAnim {
  from { transform: scale(1);    opacity: 1; }
  to   { transform: scale(1.12); opacity: 0.75; }
}

/* ── Game Over ── */
/* Box slide-in animation */
@keyframes goSlideIn {
  0%   { opacity: 0; transform: translateY(32px) scale(0.96); }
  60%  { opacity: 1; transform: translateY(-4px) scale(1.01); }
  100% { opacity: 1; transform: translateY(0)    scale(1); }
}
@keyframes goGlowPulse {
  0%,100% { box-shadow: 0 0 40px rgba(255,60,172,0.12), inset 0 1px 0 rgba(255,255,255,0.05); }
  50%     { box-shadow: 0 0 70px rgba(255,60,172,0.22), inset 0 1px 0 rgba(255,255,255,0.05); }
}

.go-box {
  opacity: 0;
  border-color: rgba(255,60,172,0.22);
}
.go-box.go-animate-in {
  animation:
    goSlideIn   0.55s cubic-bezier(0.22, 1, 0.36, 1) forwards,
    goGlowPulse 2.5s ease-in-out 0.55s infinite;
}

/* Broken ship icon */
.go-ship-icon {
  filter: drop-shadow(0 0 10px rgba(255,60,172,0.6));
  animation: goShipFloat 3s ease-in-out infinite alternate;
}
@keyframes goShipFloat {
  from { transform: translateY(0) rotate(-2deg); }
  to   { transform: translateY(-6px) rotate(2deg); }
}

.go-title {
  font-family: var(--font-game);
  font-size: clamp(18px, 5.5vw, 26px);
  letter-spacing: 4px;
  color: var(--accent2);
  text-shadow: var(--shadow-pink);
  text-align: center;
}
.go-stats {
  width: 100%;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.go-stat {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 12px 10px;
  text-align: center;
}
.go-stat span {
  display: block;
  font-family: var(--font-game);
  font-size: 8px;
  letter-spacing: 2px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.go-stat strong {
  display: block;
  font-family: var(--font-game);
  font-size: 22px;
  color: var(--accent);
  text-shadow: var(--shadow-cyan);
}
.new-best-tag {
  display: flex;
  align-items: center;
  font-family: var(--font-game);
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--accent3);
  text-shadow: 0 0 16px rgba(255,224,102,0.7);
  background: rgba(255,224,102,0.08);
  border: 1px solid rgba(255,224,102,0.25);
  border-radius: 20px;
  padding: 6px 16px;
  animation: newBestAnim 0.7s ease-in-out infinite alternate;
}
@keyframes newBestAnim {
  from { box-shadow: 0 0 8px rgba(255,224,102,0.2); }
  to   { box-shadow: 0 0 20px rgba(255,224,102,0.5); }
}

/* ── HUD Lives SVG ── */
.lives-row {
  display: flex; gap: 5px;
  margin-bottom: 4px;
  align-items: center;
}
.life-icon {
  display: inline-flex;
  transition: opacity 0.3s, filter 0.3s;
}
.life-icon.lost { opacity: 0.18; filter: none; }

/* ── HUD Pause button (SVG, no emoji) ── */
.hud-pause-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--accent);
  width: 36px; height: 36px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  pointer-events: all;
}
.hud-pause-btn:hover { background: rgba(0,240,255,0.12); }
.hud-pause-btn:active { background: rgba(0,240,255,0.22); transform: scale(0.93); }

/* ── How-to-play SVG icons (duplicate rule removed — defined above) ── */

/* ======================================
   FLOATING SCORE POP
   ====================================== */
.score-pop {
  position: fixed;
  font-family: var(--font-game);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent3);
  text-shadow: 0 0 10px rgba(255,224,102,0.7);
  pointer-events: none;
  z-index: 100;
  animation: scorePop 1s ease-out forwards;
}
@keyframes scorePop {
  0%   { opacity: 1; transform: translateY(0)   scale(1); }
  100% { opacity: 0; transform: translateY(-70px) scale(0.8); }
}


/* ======================================
   SETTINGS BUTTON (HUD top-left)
   ====================================== */
.hud-settings-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--accent);
  width: 36px; height: 36px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  pointer-events: all;
  margin-bottom: 4px;
}
.hud-settings-btn:hover { background: rgba(0,240,255,0.12); }
.hud-settings-btn:active {
  background: rgba(0,240,255,0.22);
  transform: scale(0.93) rotate(45deg);
}
.hud-left { pointer-events: all; }

/* ======================================
   SETTINGS PANEL OVERLAY
   ====================================== */
.settings-panel {
  position: absolute;
  inset: 0;
  z-index: 60;
  background: rgba(5,5,16,0.88);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: settingsFadeIn 0.22s ease-out;
}
@keyframes settingsFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.settings-box {
  background: linear-gradient(145deg, rgba(10,10,32,0.98), rgba(5,5,16,0.99));
  border: 1px solid rgba(0,240,255,0.2);
  border-radius: 20px;
  padding: 28px 22px 24px;
  width: 100%; max-width: 360px;
  display: flex; flex-direction: column; gap: 18px;
  box-shadow: 0 0 60px rgba(0,240,255,0.07);
  animation: settingsSlideUp 0.28s cubic-bezier(0.22,1,0.36,1);
}
@keyframes settingsSlideUp {
  from { transform: translateY(24px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.settings-header {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-game);
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--accent);
  text-shadow: var(--shadow-cyan);
  border-bottom: 1px solid rgba(0,240,255,0.12);
  padding-bottom: 14px;
}

.settings-modes {
  display: flex; flex-direction: column; gap: 10px;
}

/* Mode option (radio label) */
.mode-option { cursor: pointer; }
.mode-option input[type="radio"] { display: none; }

.mode-card {
  display: flex; align-items: center; gap: 14px;
  background: rgba(0,240,255,0.04);
  border: 1.5px solid rgba(0,240,255,0.12);
  border-radius: 12px;
  padding: 12px 14px;
  transition: all 0.18s;
}
.mode-option:hover .mode-card {
  background: rgba(0,240,255,0.08);
  border-color: rgba(0,240,255,0.28);
}
.mode-option input:checked ~ .mode-card {
  background: rgba(0,240,255,0.1);
  border-color: var(--accent);
  box-shadow: 0 0 14px rgba(0,240,255,0.15);
}

.mode-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  filter: drop-shadow(0 0 4px rgba(0,240,255,0.4));
}
.mode-icon svg { width: 44px; height: 44px; }

.mode-text { flex: 1; }
.mode-text strong {
  display: block;
  font-family: var(--font-game);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 4px;
}
.mode-text span {
  display: block;
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.4;
}

/* Radio check circle */
.mode-check { width: 18px; height: 18px; flex-shrink: 0; }
.mode-check svg { width: 18px; height: 18px; }
.mode-check svg circle { color: rgba(0,240,255,0.3); }
.mode-check .check-fill { fill: transparent; }
.mode-option input:checked ~ .mode-card .mode-check svg circle { color: var(--accent); }
.mode-option input:checked ~ .mode-card .mode-check .check-fill { fill: var(--accent); }

.settings-close {
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 4px;
  padding: 12px;
}

/* ======================================
   SCROLLBAR
   ====================================== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 2px; }

/* ======================================
   RESPONSIVE
   ====================================== */
@media (max-width: 380px) {
  .htp-grid { grid-template-columns: 1fr; }
  .go-stats  { grid-template-columns: 1fr; }
}