* {
  box-sizing: border-box;
  transition: 0.5s ease-in-out all;
}
:root {
  --bg-color: #0d0d0d;
  --primary-color: #00ffff;
  --primary-color-light: #66ffff;
  --text-color: #00ffff;
  --button-bg: transparent;
  --button-border: 2px solid var(--primary-color);
  --button-hover-bg: var(--primary-color);
  --button-hover-color: #000;
  --font-family: "Orbitron", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --panel-bg: rgba(13, 13, 13, 0.85);
  --box-shadow-color: #00ffff;
  --border-radius: 12px;
}
body {
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  text-align: center;
}
.laser,
.sword,
.bullet.blue {
  box-shadow: 0 0 18px 6px var(--primary-color);
  background: linear-gradient(90deg, #fff, var(--primary-color));
}

button,
#restart,
#helpBtn,
#settingsBtn {
  background: var(--button-bg);
  color: var(--text-color);
  border: var(--button-border);
  border-radius: var(--border-radius);
  box-shadow: 0 0 12px var(--box-shadow-color);
  transition: background-color 0.3s, color 0.3s, box-shadow 0.3s;
}

button:hover {
  background-color: var(--button-hover-bg);
  color: var(--button-hover-color);
  box-shadow: 0 0 25px var(--box-shadow-color);
}

body.light {
  --primary-bg: #e6e6e6;
  --secondary-bg: #fff;
  --panel-bg: #f3f7fa;
  --border-color: #c0c0c0;
  --text-color: #191a22;
  --status-bg: #fff9;
  --btn-bg: #fff;
  --btn-hover: #31c3ff;
  --btn-text: #222;
}
#game,
#help-screen,
#settings-screen {
  background: var(--panel-bg) !important;
  border-radius: var(--border-radius) !important;
  box-shadow: 0 0 25px var(--primary-color) !important;
}

#game {
  position: relative;
  width: 950px;
  height: 440px;
  margin: 48px auto 0 auto;
  background: var(--secondary-bg);
  border: 2.5px solid var(--border-color);
  border-radius: var(--ui-radius);
  box-shadow: 0 8px 24px 0 #0008;
  overflow: hidden;
}
.player {
  position: absolute;
  width: 54px;
  height: 108px;
  border-radius: 14px;
  bottom: 0;
  box-shadow: 0 6px 16px 0 #0005, 0 0 8px 2px #1ec8c866;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: box-shadow 0.2s;
}
#player1 {
  background: linear-gradient(120deg, #3399ff 40%, #0066cc 100%);
  box-shadow: 0 0 16px 5px #44c7ffbb;
}
#player2 {
  background: linear-gradient(120deg, #ff4444 40%, #cc0000 100%);
  box-shadow: 0 0 16px 5px #ff6b6bbb;
}
.arm {
  position: absolute;
  width: 15px;
  height: 40px;
  top: 28px;
  background: #23263d;
  border-radius: 6px;
  opacity: 0.92;
  box-shadow: 0 2px 7px 1px #0004;
  z-index: 2;
  transition: transform 0.5s;
}
.arm.left {
  left: -2px;
  transform-origin: top right;
}
.arm.right {
  right: -2px;
  transform-origin: top left;
}
.attacking.left {
  transform: rotate(-70deg) scaleY(1.18);
  background: #e1f7ff;
}
.attacking.right {
  transform: rotate(70deg) scaleY(1.18);
  background: #ffe1e1;
}
.sword {
  display: none;
  position: absolute;
  width: 10px;
  height: 55px;
  background: linear-gradient(180deg, #fff 70%, #aaa 100%);
  border: 2px solid #99e;
  border-radius: 5px 5px 11px 11px;
  left: 50%;
  top: 50px;
  transform: translateX(-50%);
  z-index: 4;
  box-shadow: 0 0 20px 2px #acf9;
  transition: transform 0.5s;
}
.sword.active {
  display: block;
  animation: swordslash 0.2s;
}
@keyframes swordslash {
  0% {
    transform: translateX(-50%) rotate(-70deg);
  }
  100% {
    transform: translateX(-50%) rotate(25deg);
  }
}
.shield-glow {
  box-shadow: 0 0 18px 8px var(--accent3), 0 0 0 2px #b7e0e8;
  outline: 2px solid #1ec8c8;
}
.fireball,
.bullet,
.bomb,
.laser,
.boomerang,
.freeze-ray,
.heal-effect {
  position: absolute;
  z-index: 12;
}
.fireball {
  width: 22px;
  height: 22px;
  border-radius: 50%;
}
.fireball.blue {
  background: radial-gradient(circle at 50% 20%, #ffe 70%, orange 98%);
  box-shadow: 0 0 12px 5px orange;
  border: 2px solid #ffb236;
}
.fireball.red {
  background: radial-gradient(circle at 40% 50%, #fff 55%, orangered 98%);
  box-shadow: 0 0 12px 5px #ff3838;
  border: 2px solid #ff3838;
}
.bullet {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.bullet.blue {
  background: radial-gradient(circle at 70% 40%, #fff 60%, #ffe629 98%);
  box-shadow: 0 0 10px 4px #ffe629b0;
  border: 2px solid #ffe629;
}
.bullet.red {
  background: radial-gradient(circle at 70% 40%, #fff 60%, gold 98%);
  box-shadow: 0 0 10px 4px gold;
  border: 2px solid gold;
}
.bomb {
  background: radial-gradient(circle at 8px 8px, #fff 60%, #333 100%);
  border: 2.5px solid #222;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  box-shadow: 0 0 16px 8px #ff0c;
  z-index: 5;
}
.bomb-timer {
  position: absolute;
  color: #ff0;
  font-size: 16px;
  left: 5px;
  top: 3px;
  pointer-events: none;
  text-shadow: 0 0 2px #000, 0 0 7px #ff0;
  font-family: monospace;
}
.laser {
  /* thin bright core + glow using pseudo-elements */
  position: absolute;
  height: 2px; /* thin beam */
  width: 340px;
  border-radius: 2px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(255, 30, 30, 1) 40%,
    rgba(255, 30, 30, 1) 60%,
    rgba(255, 255, 255, 0.95) 100%
  );
  box-shadow: 0 0 18px 6px rgba(255, 30, 30, 0.65),
    0 0 36px 14px rgba(255, 80, 80, 0.18);
  z-index: 20;
  overflow: visible;
  animation: laser-blast 0.12s ease-out;
}

/* thin bright core (sharp) */
.laser::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
  background: rgba(255, 220, 220, 0.98);
  box-shadow: 0 0 8px 2px rgba(255, 200, 200, 0.95);
  pointer-events: none;
}

/* softer colored glow */
.laser::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 8px;
  transform: translateY(-50%);
  background: transparent;
  box-shadow: 0 0 22px 10px rgba(255, 40, 40, 0.55);
  filter: blur(4px);
  opacity: 0.95;
  pointer-events: none;
}

/* Keep blue lasers (player 1) looking cyan/blue */
.laser.blue {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(30, 200, 255, 1) 40%,
    rgba(30, 200, 255, 1) 60%,
    rgba(255, 255, 255, 0.95) 100%
  );
  box-shadow: 0 0 18px 6px rgba(30, 200, 255, 0.55),
    0 0 36px 14px rgba(30, 200, 255, 0.12);
}
.laser.blue::after {
  box-shadow: 0 0 22px 10px rgba(30, 200, 255, 0.5);
}
.laser.blue::before {
  background: rgba(220, 245, 255, 0.98);
  box-shadow: 0 0 8px 2px rgba(200, 240, 255, 0.95);
}

/* Red laser override (player 2) */
.laser.red {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(255, 68, 68, 1) 40%,
    rgba(255, 68, 68, 1) 60%,
    rgba(255, 255, 255, 0.95) 100%
  );
  box-shadow: 0 0 18px 6px rgba(255, 68, 68, 0.75),
    0 0 40px 18px rgba(255, 80, 80, 0.25);
}
.laser.red::after {
  box-shadow: 0 0 28px 12px rgba(255, 68, 68, 0.6);
}
.laser.red::before {
  background: rgba(255, 230, 230, 0.98);
  box-shadow: 0 0 8px 2px rgba(255, 180, 180, 0.95);
}

@keyframes laser-blast {
  from {
    opacity: 0;
    transform: scaleX(0.96);
  }
  60% {
    opacity: 1;
    transform: scaleX(1.02);
  }
  to {
    opacity: 1;
    transform: scaleX(1);
  }
}
.boomerang {
  width: 32px;
  height: 32px;
  border-radius: 16px 6px 16px 6px;
  background: linear-gradient(120deg, #ffe629 70%, #222 100%);
  box-shadow: 0 0 10px 4px #ffe629b0;
  border: 2.5px solid #ffe629;
  transform: rotate(40deg);
  animation: spin-boom 0.8s linear infinite;
}
@keyframes spin-boom {
  100% {
    transform: rotate(400deg);
  }
}
.freeze-ray {
  width: 18px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(180deg, #b3f4ff 60%, #0488fc 100%);
  border: 2px solid #24e5ff;
  box-shadow: 0 0 16px 6px #1ec8c8b8;
}
.heal-effect {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, #6fffbe 60%, #11c899 100%);
  box-shadow: 0 0 20px 8px #1ec8c866;
  border: 2px solid #1ec8c8;
  animation: heal-pulse 0.5s;
}
@keyframes heal-pulse {
  0% {
    opacity: 0.2;
  }
  60% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
#health1,
#health2 {
  position: absolute;
  height: 30px;
  width: 260px;
  background: #333;
  border: 2.5px solid var(--border-color);
  border-radius: 13px;
  top: 18px;
  overflow: hidden;
  box-shadow: 0 2px 12px 0 #0003;
}
#health1 {
  left: 30px;
}
#health2 {
  right: 30px;
}
.health-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(to right, #31ff8c, #18e7e7 80%);
  border-radius: 11px;
  transition: width 0.3s;
  box-shadow: 0 0 6px 0 #17efc7aa;
}
#health2 .health-fill {
  background: linear-gradient(to right, #ffb031, #ff5163 80%);
}
#status {
  text-align: center;
  margin-top: 18px;
  background: var(--status-bg);
  border-radius: 10px;
  padding: 10px 0 7px 0;
  width: 900px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 500;
  box-shadow: 0 4px 18px 0 #0004;
  font-size: 18px;
  letter-spacing: 0.5px;
}
#winnerLabel {
  color: #1ec8c8;
  background: #23263d;
  border-radius: 10px;
  padding: 8px 0;
  width: 400px;
  margin: 18px auto 0 auto;
  box-shadow: 0 3px 14px 0 #0005;
  transition: background 0.2s, color 0.2s;
}
#restart {
  display: none;
  margin: 20px auto 0 auto;
  padding: 11px 34px;
  font-size: 19px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--btn-text);
  box-shadow: 0 3px 14px 0 #0005;
  cursor: pointer;
  transition: background 0.2s;
}
#restart:hover {
  background: var(--btn-hover);
  color: #fff;
}
#helpBtn,
#settingsBtn {
  position: absolute;
  top: 18px;
  padding: 8px 22px;
  z-index: 1000;
  cursor: pointer;
  font-size: 17px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--btn-text);
  box-shadow: 0 2px 10px 0 #0004;
  transition: background 0.2s, color 0.2s;
}
#helpBtn {
  left: 50%;
  transform: translateX(-50%);
}
#settingsBtn {
  left: calc(50% + 130px);
  transform: translateX(-50%);
}
#helpBtn:hover,
#settingsBtn:hover {
  background: var(--btn-hover);
  color: #fff;
}
#help-screen,
#settings-screen,
#ai-difficulty-screen {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--panel-bg);
  color: var(--text-color);
  z-index: 1001;
  padding: 50px;
  box-sizing: border-box;
  overflow-y: auto;
  border-radius: var(--ui-radius);
  box-shadow: 0 10px 40px #0006;
  font-size: 18px;
  animation: fadeIn 0.2s;
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
#help-screen h2,
#settings-screen h2,
#ai-difficulty-screen h2 {
  text-align: center;
  font-size: 2.3em;
  margin-bottom: 16px;
  color: var(--accent3);
  letter-spacing: 0.5px;
}
#backBtn,
#settingsBackBtn,
#aiDifficultyBackBtn {
  margin-top: 32px;
  padding: 12px 32px;
  font-size: 19px;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--btn-text);
  box-shadow: 0 3px 14px 0 #0004;
  font-weight: 600;
  transition: background 0.2s;
}
#backBtn:hover,
#settingsBackBtn:hover,
#aiDifficultyBackBtn:hover {
  background: #1ec8c8;
  color: #fff;
}
.setting-item {
  margin: 22px 0;
  padding: 0 10px;
}
.setting-item label {
  cursor: pointer;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
input[type="checkbox"],
input[type="radio"] {
  margin-right: 10px;
  transform: scale(1.3);
  cursor: pointer;
}
.radio-group {
  display: flex;
  gap: 28px;
  align-items: center;
  margin-top: 10px;
  margin-bottom: 8px;
}
.toggle-row {
  display: flex;
  align-items: center;
  gap: 16px;
}
.toggle-label {
  font-size: 20px;
  font-weight: 500;
}
#aiSettingsBtn:hover {
  background-color: var(--btn-hover);
  color: white;
}
#aiSettingsBtn {
  cursor: pointer;
}
::selection {
  background: white;
  color: black;
}
:checked {
  background: white;
  color: black;
}
/* Media Queries for Responsive Design */
@media (max-width: 1024px) {
  #game {
    width: 90%;
    height: auto;
  }
  #health1,
  #health2 {
    width: 45%;
    height: 25px;
  }
  #status {
    width: 95%;
    font-size: 16px;
  }
  #winnerLabel {
    width: 80%;
    font-size: 1.8em;
  }
}

@media (max-width: 768px) {
  #game {
    width: 95%;
    height: 300px;
  }
  .player {
    width: 40px;
    height: 80px;
  }
  .arm {
    width: 12px;
    height: 30px;
  }
  .sword {
    width: 8px;
    height: 45px;
  }
  #health1,
  #health2 {
    width: 40%;
    height: 22px;
  }
  #status {
    font-size: 14px;
    padding: 8px 0 6px 0;
  }
  #winnerLabel {
    font-size: 1.5em;
  }
  #helpBtn,
  #settingsBtn {
    padding: 6px 16px;
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  #game {
    height: 220px;
  }
  .player {
    width: 30px;
    height: 60px;
  }
  .arm {
    width: 10px;
    height: 24px;
  }
  .sword {
    width: 6px;
    height: 35px;
  }
  #health1,
  #health2 {
    width: 35%;
    height: 20px;
  }
  #status {
    font-size: 12px;
  }
  #winnerLabel {
    font-size: 1.2em;
  }
  #helpBtn,
  #settingsBtn {
    padding: 5px 12px;
    font-size: 13px;
  }
}