/* ============================================================
   SPACE BATTLE ARENA PRO — style.css
   Aesthetic: Retro-futurist arcade / neon-noir space opera
   ============================================================ */

/* ── Custom Properties ── */
:root {
  --col-bg:        #020510;
  --col-surface:   #060d1f;
  --col-border:    #0f2a5c;
  --col-accent1:   #00d4ff;   /* cyan  */
  --col-accent2:   #ff4d6d;   /* red   */
  --col-accent3:   #f9c74f;   /* gold  */
  --col-p1:        #00d4ff;
  --col-p2:        #ff4d6d;
  --col-text:      #cce8ff;
  --col-muted:     #4a6f8a;
  --font-title:    'Orbitron', sans-serif;
  --font-body:     'Rajdhani', sans-serif;
  --glow-cyan:     0 0 8px #00d4ff, 0 0 20px #00d4ff55;
  --glow-red:      0 0 8px #ff4d6d, 0 0 20px #ff4d6d55;
  --glow-gold:     0 0 8px #f9c74f, 0 0 20px #f9c74f55;
  --transition:    0.25s cubic-bezier(.4,0,.2,1);
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--col-bg);
  color: var(--col-text);
  font-family: var(--font-body);
  font-size: 16px;
}

/* ── Canvas ── */
#gameCanvas {
  display: block;
  position: fixed;
  inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
}

/* ── UI Overlay ── */
#ui-overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
}

/* ── Screens ── */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.screen.active {
  opacity: 1;
  pointer-events: all;
}
.screen-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 40px 50px;
  background: rgba(6,13,31,.92);
  border: 1px solid var(--col-border);
  border-radius: 4px;
  box-shadow: inset 0 0 60px rgba(0,212,255,.04), 0 0 60px rgba(0,0,0,.8);
  backdrop-filter: blur(10px);
  min-width: 360px;
  max-width: 90vw;
}
.screen-inner.scrollable {
  overflow-y: auto;
  max-height: 90vh;
}
.screen-title {
  font-family: var(--font-title);
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: .1em;
  color: var(--col-accent1);
  text-shadow: var(--glow-cyan);
  text-align: center;
}

/* ── Starfield Background ── */
.stars-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(1px 1px at 10% 15%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 70%, #adf 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 25%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 80%, #adf 0%, transparent 100%),
    radial-gradient(1px 1px at 45% 50%, #fff 0%, transparent 100%),
    radial-gradient(1px 1px at 72% 10%, #adf 0%, transparent 100%),
    radial-gradient(2px 2px at 20% 90%, #fff 0%, transparent 100%),
    radial-gradient(2px 2px at 90% 40%, #adf 0%, transparent 100%);
  animation: starPulse 4s ease-in-out infinite alternate;
  z-index: -1;
}
@keyframes starPulse {
  from { opacity: .6; }
  to   { opacity: 1;  }
}

/* ── Main Menu ── */
.menu-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  z-index: 1;
}
.logo-wrapper {
  position: relative;
  text-align: center;
}
.logo-glow {
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse at center, rgba(0,212,255,.18) 0%, transparent 70%);
  animation: logoPulse 3s ease-in-out infinite;
}
@keyframes logoPulse {
  0%,100% { transform: scale(1);   opacity: .7; }
  50%      { transform: scale(1.1); opacity: 1;  }
}
.logo-title {
  font-family: var(--font-title);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1;
  color: #fff;
  text-shadow: var(--glow-cyan), 0 0 40px #00d4ff99;
  letter-spacing: .06em;
  animation: logoFlicker 5s ease-in-out infinite;
}
.logo-title span {
  color: var(--col-accent2);
  text-shadow: var(--glow-red), 0 0 40px #ff4d6d88;
}
@keyframes logoFlicker {
  0%,94%,96%,100% { opacity: 1; }
  95% { opacity: .85; }
}
.logo-sub {
  font-family: var(--font-title);
  font-size: .75rem;
  letter-spacing: .4em;
  color: var(--col-accent3);
  text-shadow: var(--glow-gold);
  margin-top: 6px;
}
.main-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  min-width: 280px;
}
.version-tag {
  font-size: .7rem;
  color: var(--col-muted);
  letter-spacing: .15em;
}

/* ── Buttons ── */
.btn-menu {
  font-family: var(--font-title);
  font-size: .85rem;
  letter-spacing: .12em;
  padding: 13px 30px;
  background: transparent;
  color: var(--col-text);
  border: 1px solid var(--col-border);
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  text-align: center;
  width: 100%;
}
.btn-menu::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,.06), transparent);
  transform: translateX(-100%);
  transition: transform .4s ease;
}
.btn-menu:hover::before { transform: translateX(100%); }
.btn-menu:hover {
  border-color: var(--col-accent1);
  color: var(--col-accent1);
  text-shadow: var(--glow-cyan);
  box-shadow: 0 0 12px rgba(0,212,255,.2);
}
.btn-menu.btn-primary {
  border-color: var(--col-accent1);
  color: var(--col-accent1);
  box-shadow: 0 0 8px rgba(0,212,255,.15);
}
.btn-menu.btn-primary:hover {
  background: rgba(0,212,255,.1);
  box-shadow: var(--glow-cyan);
}
.btn-back {
  font-family: var(--font-title);
  font-size: .75rem;
  letter-spacing: .1em;
  padding: 8px 20px;
  background: transparent;
  color: var(--col-muted);
  border: 1px solid var(--col-border);
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 8px;
}
.btn-back:hover { color: var(--col-text); border-color: var(--col-text); }

/* ── Mode Select ── */
.mode-grid {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn-mode {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 20px;
  background: rgba(15,42,92,.3);
  border: 1px solid var(--col-border);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
  width: 160px;
  color: var(--col-text);
}
.btn-mode:hover {
  border-color: var(--col-accent1);
  background: rgba(0,212,255,.07);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,212,255,.15);
}
.mode-icon { font-size: 2.2rem; }
.mode-label {
  font-family: var(--font-title);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--col-accent1);
}
.mode-desc { font-size: .75rem; color: var(--col-muted); text-align: center; }

/* ── Instructions ── */
.instructions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  width: 100%;
  max-width: 700px;
}
.instr-card {
  background: rgba(15,42,92,.2);
  border: 1px solid var(--col-border);
  border-radius: 4px;
  padding: 16px;
}
.instr-card h3 {
  font-family: var(--font-title);
  font-size: .75rem;
  color: var(--col-accent1);
  margin-bottom: 10px;
  letter-spacing: .08em;
}
.instr-card ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.instr-card li { font-size: .85rem; color: var(--col-text); }
kbd {
  display: inline-block;
  padding: 2px 6px;
  background: var(--col-surface);
  border: 1px solid var(--col-border);
  border-radius: 3px;
  font-size: .75rem;
  font-family: monospace;
  color: var(--col-accent3);
}

/* ── Ranking ── */
.ranking-list {
  width: 100%;
  min-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 4px;
}
.ranking-entry {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(15,42,92,.25);
  border: 1px solid var(--col-border);
  border-radius: 3px;
  transition: background var(--transition);
}
.ranking-entry:hover { background: rgba(0,212,255,.07); }
.rank-pos {
  font-family: var(--font-title);
  font-size: .75rem;
  width: 26px;
  text-align: center;
  color: var(--col-muted);
}
.rank-pos.gold   { color: #ffd700; text-shadow: 0 0 6px #ffd700; }
.rank-pos.silver { color: #c0c0c0; text-shadow: 0 0 6px #c0c0c0; }
.rank-pos.bronze { color: #cd7f32; text-shadow: 0 0 6px #cd7f32; }
.rank-name  { flex: 1; font-size: .9rem; letter-spacing: .05em; }
.rank-score { font-family: var(--font-title); font-size: .85rem; color: var(--col-accent3); }
.rank-mode  { font-size: .7rem; color: var(--col-muted); text-align: right; min-width: 70px; }
.ranking-empty { text-align: center; color: var(--col-muted); font-size: .9rem; padding: 30px; }

/* ── HUD ── */
.hud-screen { align-items: flex-start; pointer-events: none; }
.hud-top {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 10px 16px;
  background: rgba(2,5,16,.75);
  border-bottom: 1px solid var(--col-border);
  backdrop-filter: blur(4px);
  pointer-events: none;
  gap: 12px;
}
.hud-player {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
#hud-p2 { flex-direction: row-reverse; }
.hud-label {
  font-family: var(--font-title);
  font-size: .65rem;
  color: var(--col-accent1);
  letter-spacing: .08em;
}
#hud-p2 .hud-label { color: var(--col-accent2); }
.hud-health-bar {
  flex: 1;
  max-width: 160px;
  height: 8px;
  background: rgba(255,255,255,.1);
  border-radius: 4px;
  overflow: hidden;
}
.hud-health-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #00d4ff, #00ffe7);
  border-radius: 4px;
  transition: width .15s ease;
  box-shadow: 0 0 6px #00d4ff;
}
.hud-health-fill.p2 {
  background: linear-gradient(90deg, #ff4d6d, #ff8fa3);
  box-shadow: 0 0 6px #ff4d6d;
}
.hud-score {
  font-family: var(--font-title);
  font-size: .75rem;
  color: var(--col-accent3);
  min-width: 60px;
  text-align: right;
}
#hud-p2 .hud-score { text-align: left; }
.hud-center { 
  display: flex; 
  align-items: center; 
  gap: 12px; 
  flex-shrink: 0; 
}
.hud-level-info {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hud-level-label {
  display: block;
  font-family: var(--font-title);
  font-size: .5rem;
  color: var(--col-muted);
  letter-spacing: .2em;
}
.hud-level-val {
  font-family: var(--font-title);
  font-size: 1.2rem;
  color: var(--col-accent1);
  text-shadow: var(--glow-cyan);
}

/* Boss bar */
.boss-bar-wrapper {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: min(500px, 80vw);
  pointer-events: none;
}
.boss-bar-label {
  font-family: var(--font-title);
  font-size: .65rem;
  letter-spacing: .2em;
  color: var(--col-accent2);
  text-align: center;
  margin-bottom: 4px;
  text-shadow: var(--glow-red);
  animation: bossLabelPulse 1s ease-in-out infinite alternate;
}
@keyframes bossLabelPulse { from { opacity: .7; } to { opacity: 1; } }
.boss-bar-track {
  height: 14px;
  background: rgba(255,255,255,.1);
  border: 1px solid #ff4d6d55;
  border-radius: 4px;
  overflow: hidden;
}
.boss-bar-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #ff4d6d, #ff0040);
  transition: width .2s ease;
  box-shadow: 0 0 8px #ff4d6d;
}

/* Pause button */
.btn-pause {
  background: transparent;
  border: 1px solid var(--col-border);
  color: var(--col-muted);
  font-size: 1rem;
  padding: 4px 10px;
  border-radius: 3px;
  cursor: pointer;
  pointer-events: all;
  transition: all var(--transition);
}
.btn-pause:hover { color: var(--col-text); border-color: var(--col-text); }

/* ── Level Up Banner ── */
.levelup-banner {
  text-align: center;
  animation: levelUpAnim 2.5s ease-in-out forwards;
}
@keyframes levelUpAnim {
  0%   { opacity: 0; transform: scale(.7); }
  20%  { opacity: 1; transform: scale(1.1); }
  60%  { opacity: 1; transform: scale(1);   }
  100% { opacity: 0; transform: scale(1.2); }
}
.levelup-text {
  font-family: var(--font-title);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  color: #fff;
  text-shadow: var(--glow-cyan), 0 0 60px #00d4ffaa;
  letter-spacing: .1em;
}
.levelup-sub {
  font-family: var(--font-title);
  font-size: .9rem;
  letter-spacing: .3em;
  color: var(--col-accent3);
  margin-top: 6px;
}

/* Score Warning */
.score-warning {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-title);
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: #ff4d6d;
  text-shadow: var(--glow-red);
  letter-spacing: .1em;
  text-align: center;
  padding: 20px 40px;
  background: rgba(6,13,31,.9);
  border: 2px solid #ff4d6d;
  border-radius: 4px;
  display: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 100;
}

/* ── Game Over / Victory ── */
.gameover-title {
  color: var(--col-accent2) !important;
  text-shadow: var(--glow-red) !important;
  font-size: clamp(2rem, 5vw, 3rem) !important;
  animation: gameoverPulse 1.2s ease-in-out infinite alternate;
}
@keyframes gameoverPulse {
  from { letter-spacing: .05em; }
  to   { letter-spacing: .2em;  }
}
.victory-title {
  color: var(--col-accent3) !important;
  text-shadow: var(--glow-gold) !important;
  font-size: clamp(2rem, 5vw, 3rem) !important;
}
.victory-stars {
  font-size: 2rem;
  color: var(--col-accent3);
  text-shadow: var(--glow-gold);
  letter-spacing: .3em;
  animation: starSpin 3s ease-in-out infinite;
}
@keyframes starSpin {
  0%,100% { transform: scale(1);    }
  50%      { transform: scale(1.15); }
}
.result-stats {
  font-family: var(--font-title);
  font-size: .85rem;
  color: var(--col-text);
  text-align: center;
  line-height: 2;
  letter-spacing: .06em;
}
.result-stats span { color: var(--col-accent1); }

/* Name entry */
.name-entry {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
}
.name-entry label {
  font-family: var(--font-title);
  font-size: .65rem;
  letter-spacing: .2em;
  color: var(--col-muted);
}
.name-entry input {
  font-family: var(--font-title);
  font-size: 1.1rem;
  letter-spacing: .15em;
  text-align: center;
  background: rgba(0,212,255,.06);
  border: 1px solid var(--col-accent1);
  color: var(--col-accent1);
  border-radius: 3px;
  padding: 10px 16px;
  outline: none;
  width: 100%;
  max-width: 280px;
  box-shadow: inset 0 0 10px rgba(0,212,255,.05);
  transition: all var(--transition);
}
.name-entry input:focus {
  box-shadow: var(--glow-cyan), inset 0 0 14px rgba(0,212,255,.08);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--col-surface); }
::-webkit-scrollbar-thumb { background: var(--col-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--col-accent1); }

/* ── Responsive tweaks ── */
@media (max-width: 600px) {
  .mode-grid { flex-direction: column; }
  .btn-mode { width: 100%; flex-direction: row; text-align: left; }
  .logo-title { font-size: 2.8rem; }
  .screen-inner { padding: 24px 20px; }
}