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

:root {
  --bg:            #0d0e12;
  --surface:       #16181f;
  --surface2:      #1e2028;
  --accent:        #e74c3c;
  --accent2:       #ff6b5b;
  --text:          #e8eaf0;
  --muted:         #7c8099;
  --hit:           #2ecc71;
  --radius:        12px;
  --pulse-duration: 1.4s;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  user-select: none;
  overflow: hidden;
}

/* ==============================
   Screen management
   ============================== */
.screen {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
}
.screen.active { display: flex; }

/* ==============================
   Start Screen
   ============================== */
.start-card {
  background: var(--surface);
  border: 1px solid #2a2c38;
  border-radius: 20px;
  padding: 40px 48px;
  text-align: center;
  max-width: 480px;
  width: 90%;
  box-shadow: 0 24px 64px rgba(0,0,0,.6);
}

.logo { margin-bottom: 16px; }

h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--muted);
  margin: 8px 0 28px;
  font-size: .95rem;
}

/* Settings */
.settings { display: flex; flex-direction: column; gap: 18px; margin-bottom: 28px; }

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

.setting-group label {
  font-size: .85rem;
  color: var(--muted);
  white-space: nowrap;
  min-width: 80px;
  text-align: left;
}

.btn-group { display: flex; gap: 6px; }

.opt-btn {
  padding: 6px 16px;
  border: 1px solid #2a2c38;
  background: var(--surface2);
  color: var(--muted);
  border-radius: 8px;
  cursor: pointer;
  font-size: .85rem;
  transition: all .15s;
}
.opt-btn:hover { border-color: var(--accent); color: var(--text); }
.opt-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* Start button */
.btn-start {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: .3px;
  transition: opacity .15s, transform .1s;
}
.btn-start:hover  { opacity: .9; }
.btn-start:active { transform: scale(.98); }

.btn-secondary {
  width: 100%;
  padding: 14px;
  background: transparent;
  color: var(--muted);
  border: 1px solid #2a2c38;
  border-radius: 10px;
  font-size: 1rem;
  cursor: pointer;
  transition: all .15s;
  margin-top: 10px;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }

/* ==============================
   HUD
   ============================== */
.hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: rgba(13,14,18,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #1e2028;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  z-index: 10;
  padding: 0 16px;
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.2;
}
.hud-label {
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--muted);
}
.hud-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}

.btn-quit {
  position: absolute;
  right: 16px;
  background: transparent;
  border: 1px solid #2a2c38;
  color: var(--muted);
  border-radius: 8px;
  width: 32px; height: 32px;
  cursor: pointer;
  font-size: .9rem;
  line-height: 1;
  transition: all .15s;
}
.btn-quit:hover { border-color: var(--accent); color: var(--accent); }

/* ==============================
   Arena
   ============================== */
#game-screen { display: none; }
#game-screen.active { display: block; }

#arena {
  position: fixed;
  inset: 56px 0 0 0;
  cursor: crosshair;
  overflow: hidden;
}

/* ---- Target ---- */
.target {
  position: absolute;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  cursor: crosshair;
  transition: transform .12s cubic-bezier(.34,1.6,.64,1);
  will-change: transform;
}
.target.spawned { transform: translate(-50%, -50%) scale(1); }
.target.hit      { transform: translate(-50%, -50%) scale(0); transition: transform .1s ease-in; }

/* Outer ring */
.target::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.15);
  transition: inherit;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(231,76,60,.6); }
  70%  { box-shadow: 0 0 0 14px rgba(231,76,60,0); }
  100% { box-shadow: 0 0 0 0 rgba(231,76,60,0); }
}

.target::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  animation: pulse var(--pulse-duration) ease-out infinite;
}

/* Miss flash */
#miss-flash {
  position: absolute;
  inset: 0;
  background: rgba(231,76,60,.18);
  pointer-events: none;
  opacity: 0;
  transition: opacity .05s;
  border-radius: 0;
}
#miss-flash.flash { opacity: 1; }

/* Countdown overlay */
#countdown-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13,14,18,.8);
  z-index: 5;
}
#countdown-overlay.hidden { display: none; }
#countdown-number {
  font-size: 9rem;
  font-weight: 900;
  color: var(--accent);
  animation: pop .6s ease-out;
}
@keyframes pop {
  0%   { transform: scale(1.4); opacity: 0; }
  100% { transform: scale(1);   opacity: 1; }
}

/* Timer warning */
.hud-value.warn { color: var(--accent); }

/* ==============================
   Results Screen
   ============================== */
#results-screen { background: rgba(13,14,18,.6); backdrop-filter: blur(4px); }

.results-card {
  background: var(--surface);
  border: 1px solid #2a2c38;
  border-radius: 20px;
  padding: 40px 48px;
  text-align: center;
  max-width: 520px;
  width: 90%;
  box-shadow: 0 24px 64px rgba(0,0,0,.6);
}

.results-card h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 28px;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.stat {
  background: var(--surface2);
  border-radius: var(--radius);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
}
.stat-label {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--muted);
}

/* Accuracy bar */
.performance-bar-wrap {
  text-align: left;
  margin-bottom: 24px;
}
.performance-label {
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: 8px;
}
.performance-track {
  height: 8px;
  background: var(--surface2);
  border-radius: 99px;
  overflow: hidden;
}
.performance-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent2), var(--hit));
  border-radius: 99px;
  transition: width 1s cubic-bezier(.22,1,.36,1);
}

.results-actions { display: flex; flex-direction: column; gap: 0; }

/* ==============================
   Hit popup
   ============================== */
.hit-popup {
  position: fixed;
  font-size: .8rem;
  font-weight: 700;
  color: var(--hit);
  pointer-events: none;
  z-index: 20;
  animation: floatUp .6s ease-out forwards;
}
@keyframes floatUp {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-40px); }
}

/* ==============================
   Responsive
   ============================== */
@media (max-width: 480px) {
  .start-card, .results-card { padding: 28px 20px; }
  .hud { gap: 18px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  h1 { font-size: 1.7rem; }
}