* {
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #05070a;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#hud {
  position: fixed;
  inset: 0;
  z-index: 10;
  color: #fff;
  pointer-events: none;
}

.hud-box {
  position: absolute;
  padding: 13px 15px;
  background: rgba(5, 8, 12, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 22px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(3px);
}

#healthPanel {
  top: 20px;
  left: 20px;
  width: 260px;
}

#gameInfo {
  top: 284px;
  right: 20px;
  min-width: 220px;
  line-height: 1.8;
  font-size: 13px;
  letter-spacing: 1px;
  text-align: right;
}

#ammoText {
  color: #ffe08a;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(255, 183, 72, 0.42);
}

#ammoText.low {
  color: #ff6d58;
  animation: ammoPulse 0.55s ease-in-out infinite alternate;
}

#minimapPanel {
  top: 20px;
  right: 20px;
  width: 220px;
  padding: 9px 10px 8px;
}

#minimapHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
  color: #dce9ef;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
}

#minimapHeader small {
  color: #768b96;
  font-size: 9px;
  letter-spacing: 1px;
}

#minimap {
  display: block;
  width: 198px;
  height: 198px;
  background: #091015;
  border: 1px solid rgba(157, 206, 224, 0.35);
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.82);
}

.minimap-legend {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  color: #a9b8c0;
  font-size: 9px;
  letter-spacing: 1px;
}

.minimap-legend i {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 3px;
  border-radius: 50%;
}

.legend-player { background: #ffffff; }
.legend-enemy { background: #ff4a42; }
.legend-supply { background: #68e899; }

#healthHeader {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
}

#healthTrack {
  height: 17px;
  overflow: hidden;
  background: #171b21;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

#healthFill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #38b84a, #75ea68);
  box-shadow: 0 0 12px rgba(58, 222, 84, 0.55);
  transition: width 80ms linear, background 150ms ease;
}

#objective {
  position: absolute;
  top: 25px;
  left: 50%;
  max-width: 520px;
  padding: 8px 18px;
  color: #f0c56b;
  background: rgba(4, 7, 10, 0.68);
  border-bottom: 2px solid rgba(240, 177, 70, 0.75);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  text-align: center;
  transform: translateX(-50%);
}

#climbHint {
  position: absolute;
  left: 50%;
  bottom: 95px;
  padding: 9px 15px;
  opacity: 0;
  color: #fff3b5;
  background: rgba(0, 0, 0, 0.68);
  border: 1px solid rgba(255, 226, 128, 0.45);
  font-size: 13px;
  transform: translateX(-50%);
  transition: opacity 120ms linear;
}

#pickupNotice {
  position: absolute;
  left: 50%;
  bottom: 140px;
  padding: 10px 18px;
  opacity: 0;
  color: #ffffff;
  background: rgba(8, 15, 19, 0.84);
  border: 1px solid rgba(111, 231, 151, 0.65);
  box-shadow: 0 0 18px rgba(72, 222, 126, 0.22);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  transform: translateX(-50%);
  transition: opacity 140ms linear;
}

#reloadIndicator {
  position: absolute;
  left: 50%;
  bottom: 80px;
  min-width: 170px;
  padding: 8px 15px;
  opacity: 0;
  color: #ffd477;
  background: rgba(7, 11, 14, 0.84);
  border: 1px solid rgba(255, 191, 83, 0.52);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 3px;
  text-align: center;
  transform: translateX(-50%);
  transition: opacity 100ms linear;
}

#reloadIndicator.visible {
  opacity: 1;
}

#scopeOverlay {
  position: absolute;
  inset: 0;
  z-index: 18;
  opacity: 0;
  background: radial-gradient(
    circle at center,
    transparent 0,
    transparent min(28vw, 44vh),
    rgba(0, 0, 0, 0.96) calc(min(28vw, 44vh) + 3px),
    #000 100%
  );
  transition: opacity 110ms ease;
}

#scopeOverlay.active {
  opacity: 1;
}

.scope-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(56vw, 88vh);
  height: min(56vw, 88vh);
  border: 3px solid rgba(10, 12, 13, 0.92);
  border-radius: 50%;
  box-shadow: inset 0 0 45px rgba(0, 0, 0, 0.52);
  transform: translate(-50%, -50%);
}

.scope-line-x,
.scope-line-y {
  position: absolute;
  top: 50%;
  left: 50%;
  background: rgba(18, 18, 18, 0.9);
  box-shadow: 0 0 1px rgba(255, 255, 255, 0.45);
  transform: translate(-50%, -50%);
}

.scope-line-x { width: min(56vw, 88vh); height: 1px; }
.scope-line-y { width: 1px; height: min(56vw, 88vh); }

.scope-center {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  border: 1px solid rgba(180, 30, 25, 0.92);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

#crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 28px;
  height: 28px;
  transform: translate(-50%, -50%);
  filter: drop-shadow(0 0 2px #000);
}

#crosshair span {
  position: absolute;
  display: block;
  background: rgba(255, 255, 255, 0.97);
}

#crosshair .top,
#crosshair .bottom {
  left: 13px;
  width: 2px;
  height: 8px;
}

#crosshair .top { top: 0; }
#crosshair .bottom { bottom: 0; }

#crosshair .left,
#crosshair .right {
  top: 13px;
  width: 8px;
  height: 2px;
}

#crosshair .left { left: 0; }
#crosshair .right { right: 0; }

#hitMarker {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  opacity: 0;
  transform: translate(-50%, -50%) rotate(45deg);
}

#hitMarker::before,
#hitMarker::after {
  content: "";
  position: absolute;
  top: 11px;
  left: 1px;
  width: 22px;
  height: 2px;
  background: #ff5252;
  box-shadow: 0 0 5px #000;
}

#hitMarker::after {
  transform: rotate(90deg);
}

#damageVignette {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle, transparent 42%, rgba(190, 0, 0, 0.74) 100%);
  transition: opacity 90ms linear;
}

.screen {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
  background:
    radial-gradient(circle at center, rgba(27, 38, 48, 0.52), rgba(2, 4, 7, 0.94)),
    rgba(3, 5, 8, 0.88);
}

.screen.hidden {
  display: none;
}

.action-button.hidden {
  display: none;
}

.panel {
  width: min(720px, calc(100vw - 36px));
  padding: 34px 42px;
  background: rgba(12, 16, 21, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.82);
}

/* 主菜单采用程序化钢板、警戒条与扫描网格，保持单文件且不依赖图片。 */
#modeScreen {
  overflow-y: auto;
  background:
    linear-gradient(115deg, rgba(238, 96, 38, 0.1), transparent 38%),
    radial-gradient(circle at 72% 30%, rgba(54, 111, 135, 0.28), transparent 34%),
    linear-gradient(180deg, rgba(3, 6, 9, 0.64), rgba(2, 4, 6, 0.96));
}

#modeScreen::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.24;
  background-image:
    linear-gradient(rgba(129, 164, 177, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(129, 164, 177, 0.16) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, #000, transparent 82%);
  pointer-events: none;
}

#modeScreen::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    rgba(255, 255, 255, 0.08) 4px
  );
  pointer-events: none;
}

#modeScreen .main-menu-panel {
  position: relative;
  z-index: 1;
  width: min(940px, calc(100vw - 42px));
  padding: 38px 46px 32px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(28, 36, 42, 0.97), rgba(8, 12, 16, 0.97)),
    rgba(9, 13, 17, 0.96);
  border: 1px solid rgba(174, 201, 211, 0.26);
  border-left: 5px solid #dc6939;
  box-shadow:
    0 30px 100px rgba(0, 0, 0, 0.84),
    inset 0 0 80px rgba(84, 126, 141, 0.08);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

#modeScreen .main-menu-panel::before {
  content: "";
  position: absolute;
  top: 0;
  right: 24px;
  width: 260px;
  height: 8px;
  background: repeating-linear-gradient(135deg, #e1703e 0 15px, #1a2025 15px 30px);
}

.menu-kicker {
  margin-bottom: 8px;
  color: #7fb6c8;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 5px;
  text-align: left;
}

#modeScreen .main-title {
  margin: 0;
  color: #f1f3ef;
  font-size: clamp(54px, 8vw, 98px);
  font-weight: 1000;
  line-height: 1;
  letter-spacing: 14px;
  text-align: left;
  text-shadow: 5px 5px 0 rgba(109, 39, 23, 0.72), 0 0 38px rgba(226, 97, 47, 0.28);
}

#modeScreen .main-title span {
  color: #e26a38;
}

.menu-subtitle-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 12px 0 28px;
  color: #c0cbd0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  text-align: left;
}

.menu-subtitle-row::before {
  content: "";
  width: 66px;
  height: 3px;
  background: #e26a38;
  box-shadow: 0 0 14px rgba(226, 106, 56, 0.55);
}

#modeScreen .mode-grid {
  gap: 18px;
  margin: 0 0 20px;
}

#modeScreen .mode-card {
  position: relative;
  min-height: 190px;
  padding: 26px 26px 22px;
  overflow: hidden;
  text-align: left;
  background:
    linear-gradient(145deg, rgba(56, 70, 78, 0.82), rgba(16, 22, 27, 0.96));
  border: 1px solid rgba(162, 193, 204, 0.23);
  border-bottom: 3px solid #576b75;
}

#modeScreen .mode-card:hover {
  border-color: rgba(238, 141, 73, 0.72);
  border-bottom-color: #e2733e;
  background: linear-gradient(145deg, rgba(72, 83, 88, 0.9), rgba(24, 31, 36, 0.98));
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.42);
}

.mode-card-number {
  position: absolute;
  top: 10px;
  right: 15px;
  color: rgba(255, 255, 255, 0.09);
  font-size: 62px;
  font-weight: 1000;
  line-height: 1;
}

.mode-card-tag {
  display: inline-block !important;
  margin-bottom: 16px;
  padding: 4px 8px;
  color: #ffc379 !important;
  background: rgba(195, 82, 38, 0.2);
  border: 1px solid rgba(226, 106, 56, 0.35);
  font-size: 10px !important;
  font-weight: 800;
  letter-spacing: 2px;
}

#modeScreen .mode-card strong {
  margin-bottom: 12px;
  color: #f5e3c7;
  font-size: 28px;
}

.menu-status-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-bottom: 20px;
  background: rgba(143, 170, 179, 0.16);
  border: 1px solid rgba(143, 170, 179, 0.16);
}

.menu-status-strip span {
  padding: 10px 8px;
  color: #94a8b1;
  background: rgba(8, 13, 17, 0.86);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
}

#modeScreen .controls {
  padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #84949b;
}

#modeScreen .controls b {
  display: inline-block;
  min-width: 28px;
  padding: 1px 5px;
  color: #eef3f3;
  background: #283139;
  border: 1px solid #46545d;
  text-align: center;
}

.title {
  margin: 0 0 8px;
  font-size: clamp(38px, 6vw, 68px);
  font-weight: 900;
  letter-spacing: 8px;
  text-shadow: 0 0 26px rgba(235, 70, 45, 0.55);
}

.subtitle {
  margin: 0 0 25px;
  color: #f0b146;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 4px;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.map-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0;
}

#endlessMapScreen .panel {
  width: min(1080px, calc(100vw - 36px));
  margin: auto;
}

#endlessMapScreen {
  align-items: flex-start;
  overflow-y: auto;
  padding: 24px 0;
}

.endless-map-button {
  min-height: 330px;
  padding: 14px;
  text-align: left;
}

.endless-map-button strong {
  margin-bottom: 8px;
  font-size: 20px;
  text-align: center;
}

.endless-map-preview {
  display: block;
  width: 100%;
  height: 150px;
  margin: 8px 0 12px;
  background: #071015;
  border: 1px solid rgba(148, 201, 219, 0.36);
  box-shadow: inset 0 0 22px rgba(0, 0, 0, 0.85);
}

.map-layout-label {
  display: block;
  margin-bottom: 5px;
  color: #f0b146 !important;
  font-size: 11px !important;
  font-weight: 700;
  letter-spacing: 2px;
  text-align: center;
}

.mode-button,
.action-button {
  color: #fff;
  background: linear-gradient(180deg, #28323c, #171d23);
  border: 1px solid rgba(255, 255, 255, 0.25);
  cursor: pointer;
  font-family: inherit;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.mode-button {
  min-height: 150px;
  padding: 20px;
}

.mode-button:hover,
.action-button:hover {
  border-color: #f0b146;
  background: linear-gradient(180deg, #3a4651, #20272e);
  transform: translateY(-2px);
}

.mode-button strong {
  display: block;
  margin-bottom: 10px;
  color: #ffd078;
  font-size: 24px;
  letter-spacing: 3px;
}

.mode-button span {
  color: #bfc7cf;
  font-size: 13px;
  line-height: 1.75;
}

.action-button {
  min-width: 190px;
  margin: 8px;
  padding: 13px 22px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
}

.controls {
  color: #c4ccd4;
  font-size: 13px;
  line-height: 2;
  letter-spacing: 1px;
}

.controls b {
  color: #fff;
}

.prompt {
  margin-top: 20px;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
  animation: pulse 1.15s ease-in-out infinite alternate;
}

#pauseScreen {
  cursor: pointer;
  background: rgba(3, 5, 8, 0.78);
}

#pauseScreen .panel {
  width: min(500px, calc(100vw - 36px));
}

#loadingScreen {
  z-index: 50;
}

#resultTitle.fail {
  color: #ef4a3d;
}

#resultTitle.win {
  color: #71e47c;
}

@keyframes pulse {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

@keyframes ammoPulse {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

@media (max-width: 640px) {
  .mode-grid,
  .map-grid {
    grid-template-columns: 1fr;
  }

  #gameInfo {
    top: auto;
    right: 12px;
    bottom: 12px;
    min-width: 210px;
  }

  #minimapPanel {
    top: 12px;
    right: 12px;
    width: 148px;
    padding: 7px;
  }

  #minimap {
    width: 132px;
    height: 132px;
  }

  #minimapHeader {
    margin-bottom: 4px;
    font-size: 10px;
  }

  #minimapHeader small,
  .minimap-legend {
    display: none;
  }

  .endless-map-button {
    min-height: 300px;
  }

  #healthPanel {
    top: 12px;
    left: 12px;
    width: 220px;
  }

  #modeScreen .main-menu-panel {
    width: calc(100vw - 24px);
    margin: 12px 0;
    padding: 30px 22px 24px;
  }

  #modeScreen .main-title {
    font-size: 48px;
    letter-spacing: 8px;
  }

  .menu-status-strip {
    grid-template-columns: 1fr;
  }
}