/* ============================================================================
   AI GAME · 沙漠对决 / DUST DUEL — UI 视觉（CS2 风格）
   仅使用系统字体与纯 CSS，无任何外部图片/字体/网络资源。
   性能约定：无 backdrop-filter、无大面积动画；过渡仅用 transform / opacity。
   层级：canvas 0 · #scope-overlay 20 · #hud 30 · .screen 40 · #loading 100 ·
         #fatal-error 120（.screen 的 z-index 由 index.html 内联定义，勿改）
   ========================================================================== */

/* ---------------------------------------------------------------------------
   0. 设计变量 / 基础
   --------------------------------------------------------------------------- */
:root {
  --bg: #0b0c0e; --panel: rgba(12, 14, 16, .82); --panel-2: rgba(9, 10, 12, .94); --line: rgba(255, 255, 255, .10);
  --line-soft: rgba(255, 255, 255, .06); --accent: #f5a623; --accent-hi: #ffc257; --accent-dim: rgba(245, 166, 35, .40);
  --accent-soft: rgba(245, 166, 35, .12); --text: #ece6d9; --text-dim: #a9a294; --text-mute: #7d786e; --danger: #e05243;
  --win: #f5c15a; --lose: #b4453a; --font-ui: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: Consolas, "Segoe UI", monospace;
  --cut-sm: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 7px 100%, 0 calc(100% - 7px));
  --cut-md: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  --cut-lg: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  --gap-edge: clamp(14px, 1.6vw, 24px);
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: var(--bg); color: var(--text);
  font-family: var(--font-ui); font-size: 16px; line-height: 1.4; -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility; user-select: none;
}
button, input, select, textarea { font-family: inherit; }
button { -webkit-appearance: none; appearance: none; }
::selection { background: rgba(245, 166, 35, .35); color: #fff; }
.hidden { display: none !important; }
.num, #score-player, #score-bot, #ammo-value, #health-value, #result-score, #stat-kills, #stat-deaths, #stat-hs, #stat-acc,
#stat-best, .setting-value, #loading-text, #fps {
  font-family: var(--font-num);
}

/* 画布与所有可点击按钮（菜单层 pointer-events:auto，HUD 层 none） */
#game-canvas { background: var(--bg); cursor: crosshair; }
#game-canvas:focus { outline: none; }
#btn-start, #btn-help, #btn-settings, #btn-help-back, #btn-settings-back, #btn-resume, #btn-restart, #btn-pause-settings,
#btn-pause-menu, #btn-rematch, #btn-change-diff, #btn-results-menu {
  pointer-events: auto;
}

/* 设置项细节 id（滑条/数值/分段容器） */
#sens, #vol { min-width: 0; }
#sens-value, #vol-value { min-width: 52px; }
#scale-options, #crosshair-options { flex-wrap: wrap; }
#stat-diff { font-size: 18px; }
#pause-score-player, #pause-score-bot { font-family: var(--font-num); }

/* 通用滚动条（菜单在低分辨率下可能内部滚动） */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: rgba(255, 255, 255, .03); }
::-webkit-scrollbar-thumb { background: rgba(245, 166, 35, .32); }
::-webkit-scrollbar-thumb:hover { background: rgba(245, 166, 35, .55); }

/* 全屏界面层阴影遮罩（.screen 的 position/inset/z-index 由内联样式给） */
.screen {
  display: flex; align-items: center; justify-content: center; padding: var(--gap-edge); overflow-y: auto; overflow-x: hidden;
  pointer-events: auto;
}

/* ---------------------------------------------------------------------------
   1. 通用按钮 / 面板 / 键帽 / 分段按钮
   --------------------------------------------------------------------------- */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px;
  padding: 0 26px; border: 1px solid var(--line); background: rgba(16, 18, 21, .88); color: #ddd6c8; font-size: 14px;
  font-weight: 600; letter-spacing: .14em; cursor: pointer; clip-path: var(--cut-sm);
  transition: transform .12s ease, opacity .12s ease; -webkit-tap-highlight-color: transparent;
}
.btn:hover { border-color: var(--accent-dim); background: rgba(245, 166, 35, .14); color: #fff; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn-primary {
  border-color: #f5a623; background: linear-gradient(180deg, #ffc257 0%, #f5a623 52%, #dc8a10 100%); color: #17130b;
  font-weight: 800;
}
.btn-primary:hover {
  border-color: #ffd27a; background: linear-gradient(180deg, #ffd27a 0%, #ffb52f 52%, #ea9612 100%); color: #0d0a05;
}
.btn-primary::after {
  content: ""; position: absolute; left: 6px; right: 6px; top: 0; height: 1px; background: rgba(255, 255, 255, .55);
  opacity: .75; pointer-events: none;
}
.btn-ghost { border-color: rgba(255, 255, 255, .16); background: rgba(12, 14, 16, .55); color: #b9b2a4; }
.btn-ghost:hover { border-color: var(--accent-dim); background: rgba(245, 166, 35, .10); color: #f0e6d2; }
.panel {
  position: relative; width: 100%; max-width: 700px; max-height: calc(100vh - var(--gap-edge) * 2); overflow-y: auto;
  padding: 30px 34px 28px; background: linear-gradient(180deg, rgba(20, 22, 26, .97) 0%, rgba(10, 11, 13, .97) 100%);
  border: 1px solid var(--line); clip-path: var(--cut-md); box-shadow: 0 24px 60px rgba(0, 0, 0, .55);
}
.panel::before {
  content: ""; position: absolute; top: 0; left: 0; width: 104px; height: 2px;
  background: linear-gradient(90deg, var(--accent), rgba(245, 166, 35, 0)); pointer-events: none;
}
.panel-wide { max-width: 1060px; }
.panel-title {
  position: relative; margin: 0 0 22px; padding-left: 14px; font-size: 22px; font-weight: 800; letter-spacing: .22em;
  color: #f4eee1;
}
.panel-title::before {
  content: ""; position: absolute; left: 0; top: 3px; bottom: 3px; width: 3px;
  background: linear-gradient(180deg, var(--accent), rgba(245, 166, 35, .12));
}
.panel-title::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -11px; height: 1px;
  background: linear-gradient(90deg, rgba(245, 166, 35, .35), rgba(255, 255, 255, .04) 60%, transparent);
}
.key {
  display: inline-block; min-width: 34px; padding: 4px 9px; background: linear-gradient(180deg, #2c3036 0%, #15171a 100%);
  border: 1px solid #464c54; border-bottom: 2px solid #050607; border-radius: 3px; color: #f2e9d8;
  font-family: var(--font-num); font-size: 12px; font-weight: 700; letter-spacing: .06em; text-align: center;
  white-space: nowrap; box-shadow: 0 1px 0 rgba(0, 0, 0, .5);
}
.seg {
  display: flex; flex-wrap: nowrap; gap: 2px; padding: 2px; background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line-soft); width: max-content; max-width: 100%;
}
.seg-btn {
  min-width: 42px; padding: 6px 11px; border: 0; background: transparent; color: var(--text-dim); font-size: 12px;
  letter-spacing: .04em; cursor: pointer; transition: transform .1s ease, opacity .1s ease;
}
.seg-btn:hover { background: rgba(255, 255, 255, .07); color: #fff; }
.seg-btn.active { background: linear-gradient(180deg, #ffc257 0%, #f5a623 100%); color: #17130b; font-weight: 700; }
.seg-btn:focus-visible { outline: 1px solid var(--accent); outline-offset: 1px; }

/* ---------------------------------------------------------------------------
   2. 主菜单 #menu —— 暖沙暗调 + 网格 + 扫描线 + HUD 装饰
   --------------------------------------------------------------------------- */
#menu { display: block; padding: 0; background: #090a0b; overflow-y: auto; overflow-x: hidden; }
.menu-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 42% 26% at 50% 28%, rgba(245, 166, 35, .10), transparent 72%),
    radial-gradient(ellipse 60% 42% at 75% 8%, rgba(245, 166, 35, .20), transparent 70%),
    radial-gradient(ellipse 46% 36% at 16% 92%, rgba(198, 122, 42, .16), transparent 72%),
    radial-gradient(ellipse 80% 26% at 50% 80%, rgba(245, 166, 35, .08), transparent 70%),
    radial-gradient(circle 1.5px at 82% 34%, rgba(255, 214, 150, .34), transparent 60%),
    radial-gradient(circle 1px at 12% 26%, rgba(255, 214, 150, .28), transparent 60%),
    radial-gradient(circle 1.5px at 64% 72%, rgba(255, 214, 150, .22), transparent 60%),
    radial-gradient(circle 1px at 31% 61%, rgba(255, 214, 150, .26), transparent 60%),
    radial-gradient(circle 1px at 88% 63%, rgba(255, 214, 150, .20), transparent 60%),
    radial-gradient(circle 1px at 46% 17%, rgba(255, 214, 150, .20), transparent 60%),
    linear-gradient(to top, rgba(245, 166, 35, .14), rgba(245, 166, 35, 0) 26%),
    linear-gradient(168deg, #241f16 0%, #15140f 34%, #0d0e10 62%, #08090b 100%);
}
.menu-bg::before {
  content: ""; position: absolute; inset: 14px; border: 1px solid rgba(245, 166, 35, .10); pointer-events: none;
}
.menu-bg::after {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, .22) 0 1px, transparent 1px 4px); opacity: .42;
  pointer-events: none;
}
.menu-grid {
  position: absolute; left: 50%; bottom: 0; width: 180%; height: 62%; pointer-events: none;
  transform: translateX(-50%) perspective(520px) rotateX(64deg); transform-origin: 50% 100%;
  background-image: linear-gradient(rgba(245, 166, 35, .22) 1px, transparent 1px), linear-gradient(90deg, rgba(245, 166, 35,
    .22) 1px, transparent 1px); background-size: 60px 60px; opacity: .62;
  -webkit-mask-image: linear-gradient(to top, rgba(0, 0, 0, .95), transparent 74%);
  mask-image: linear-gradient(to top, rgba(0, 0, 0, .95), transparent 74%);
}

/* 底部两侧 HUD 装饰小字 */
#menu::before {
  content: "MAP // DE_DUST_DUEL · MODE // DUEL 1V1 · 8 KILLS"; position: fixed; left: 30px; bottom: 20px; z-index: 3;
  font-family: var(--font-num); font-size: 9.5px; letter-spacing: .22em; color: #63605a; pointer-events: none;
}
#menu::after {
  content: "ENGINE // WEBGL1 · OFFLINE · NO EXTERNAL ASSETS"; position: fixed; right: 30px; bottom: 20px; z-index: 3;
  font-family: var(--font-num); font-size: 9.5px; letter-spacing: .22em; color: #63605a; pointer-events: none;
}
.menu-topline {
  position: absolute; top: 24px; left: 34px; right: 34px; display: flex; align-items: center; justify-content: space-between;
  z-index: 3; pointer-events: none;
}
.tag {
  display: inline-flex; align-items: center; padding: 3px 10px; border: 1px solid rgba(245, 166, 35, .45);
  background: rgba(245, 166, 35, .08); color: var(--accent); font-family: var(--font-num); font-size: 10px;
  letter-spacing: .30em;
}
.tag.dim { border-color: rgba(255, 255, 255, .14); background: transparent; color: var(--text-mute); letter-spacing: .20em; }
.menu-content {
  position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 100%; max-width: 820px; min-height: 100vh; margin: 0 auto; padding: 62px 40px 30px; text-align: center;
}
#menu-title {
  position: relative; display: inline-block; margin: 20px 0 0; font-size: clamp(56px, 7.4vw, 104px); font-weight: 900;
  line-height: .98; letter-spacing: .16em; text-indent: .16em;
  background: linear-gradient(180deg, #fff8ea 0%, #f3e6cc 42%, #cfae74 78%, #a8823f 100%); -webkit-background-clip: text;
  background-clip: text; color: transparent; transform: skewX(-6deg);
}
#menu-title::before {
  content: ""; position: absolute; left: 50%; top: -16px; width: 72px; height: 3px; margin-left: -36px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
#menu-title::after {
  content: ""; position: absolute; left: 50%; bottom: -15px; width: 240px; height: 1px; margin-left: -120px;
  background: linear-gradient(90deg, transparent, rgba(245, 166, 35, .62), transparent);
}
#menu-sub {
  margin-top: 30px; font-size: clamp(11px, .95vw, 13px); letter-spacing: .30em; text-indent: .30em; color: #b3a58a;
}
.diff-section { width: 100%; margin-top: 30px; }
.section-label {
  display: flex; align-items: center; gap: 12px; font-size: 10.5px; letter-spacing: .34em; color: var(--text-mute);
  text-align: left;
}
.section-label::after {
  content: ""; flex: 1 1 auto; height: 1px;
  background: linear-gradient(90deg, rgba(245, 166, 35, .35), rgba(255, 255, 255, .03));
}
.diff-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 14px; }
.diff-card {
  position: relative; padding: 16px 16px 15px;
  background: linear-gradient(180deg, rgba(18, 20, 23, .84) 0%, rgba(10, 11, 13, .84) 100%);
  border: 1px solid rgba(255, 255, 255, .09); clip-path: var(--cut-sm); text-align: left; cursor: pointer;
  transition: transform .14s ease, opacity .14s ease;
}
.diff-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: transparent; pointer-events: none;
}
.diff-card:hover {
  transform: translateY(-2px); border-color: rgba(245, 166, 35, .42);
  background: linear-gradient(180deg, rgba(32, 28, 20, .92) 0%, rgba(14, 13, 11, .92) 100%);
}
.diff-card.selected {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(245, 166, 35, .20) 0%, rgba(38, 30, 16, .92) 55%, rgba(18, 16, 12, .94) 100%);
}
.diff-card.selected::before { background: linear-gradient(90deg, var(--accent), rgba(245, 166, 35, 0) 88%); }
.diff-name { font-size: 21px; font-weight: 800; letter-spacing: .10em; color: #f0e8da; }
.diff-card.selected .diff-name { color: #ffe0a3; }
.diff-en { margin-top: 3px; font-family: var(--font-num); font-size: 9.5px; letter-spacing: .30em; color: var(--text-mute); }
.diff-card.selected .diff-en { color: var(--accent); }
.diff-desc { margin-top: 10px; min-height: 38px; font-size: 11.5px; line-height: 1.65; color: var(--text-dim); }
.diff-card.selected .diff-desc { color: #ded4c0; }
.diff-meter { margin-top: 13px; height: 3px; background: rgba(255, 255, 255, .08); }
.diff-meter i { display: block; height: 100%; background: var(--accent); opacity: .8; }
.diff-card[data-difficulty="easy"] .diff-meter i { background: #6fa96b; }
.diff-card[data-difficulty="hard"] .diff-meter i { background: #d0574c; }
.menu-actions { display: flex; flex-wrap: wrap; gap: 10px; width: 100%; max-width: 640px; margin-top: 28px; }
#btn-start { flex: 1 0 100%; min-height: 58px; font-size: 17px; letter-spacing: .44em; text-indent: .44em; }
#btn-start::after {
  content: "›"; position: absolute; right: 22px; top: 50%; margin-top: -15px; font-size: 26px; line-height: 1; opacity: .75;
  pointer-events: none;
}
#btn-help, #btn-settings { flex: 1 1 0; min-height: 42px; font-size: 13px; letter-spacing: .18em; }
#menu-best { margin-top: 24px; font-size: 11.5px; letter-spacing: .12em; color: var(--text-mute); }
#menu-best::before { content: "◆"; margin-right: 8px; font-size: 7px; vertical-align: 2px; color: var(--accent); }
.menu-foot { margin-top: 8px; font-size: 10px; letter-spacing: .14em; color: #5d594f; }

/* ---------------------------------------------------------------------------
   3. 操作说明 #help
   --------------------------------------------------------------------------- */
#help, #settings {
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, .14) 0 1px, transparent 1px 4px),
    radial-gradient(ellipse 72% 62% at 50% 40%, rgba(23, 21, 16, .95) 0%, rgba(5, 6, 7, .985) 78%);
}
.help-columns { display: grid; grid-template-columns: minmax(0, .96fr) minmax(0, 1.04fr); gap: 34px; }
.key-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.key-table td {
  padding: 5px 8px; border-bottom: 1px dashed rgba(255, 255, 255, .07); color: var(--text-dim); vertical-align: middle;
}
.key-table tr:last-child td { border-bottom: 0; }
.key-table td:first-child { width: 46%; padding-left: 0; }
.key-table tr:hover td { background: rgba(245, 166, 35, .05); color: #efe7d8; }
.help-tips { border-left: 1px solid rgba(245, 166, 35, .22); padding-left: 22px; }
.tip-title { margin: 0 0 8px; font-size: 11px; font-weight: 700; letter-spacing: .26em; color: var(--accent); }
.tip-title + ul { margin-top: 0; }
.help-tips ul { margin: 0 0 16px; padding-left: 17px; font-size: 12.5px; line-height: 1.8; color: #b6ae9e; }
.help-tips li { margin-bottom: 4px; }
.help-tips li::marker { color: rgba(245, 166, 35, .65); }
.help-tips b { color: #f5d38a; font-weight: 600; }
#btn-help-back, #btn-settings-back { display: block; margin: 24px auto 0; min-width: 200px; }

/* ---------------------------------------------------------------------------
   4. 设置 #settings
   --------------------------------------------------------------------------- */
#settings .panel { max-width: 700px; }
.setting-row {
  display: grid; grid-template-columns: 148px minmax(0, 1fr) 70px; align-items: center; gap: 16px; padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}
.setting-row label { font-size: 13.5px; color: #cfc8ba; letter-spacing: .04em; }
.setting-value { font-family: var(--font-num); font-size: 13px; color: var(--accent); text-align: right; }
.slider {
  -webkit-appearance: none; appearance: none; width: 100%; height: 18px; background: transparent; cursor: pointer;
  accent-color: var(--accent);
}
.slider::-webkit-slider-runnable-track {
  height: 4px; background: rgba(255, 255, 255, .14); border: 1px solid rgba(255, 255, 255, .06);
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 12px; height: 16px; margin-top: -7px; border: 1px solid #1a150c;
  border-radius: 0; background: linear-gradient(180deg, #ffd27a 0%, #f5a623 100%);
  box-shadow: 0 0 0 1px rgba(245, 166, 35, .45);
}
.slider:hover::-webkit-slider-thumb { background: linear-gradient(180deg, #fff0c4 0%, #ffb52f 100%); }
.slider:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; }
.setting-hint {
  margin: 16px 0 4px; padding-left: 10px; border-left: 2px solid rgba(245, 166, 35, .35); font-size: 11.5px; line-height: 1.7;
  color: #878176;
}

/* ---------------------------------------------------------------------------
   5. 暂停 #pause-menu
   --------------------------------------------------------------------------- */
#pause-menu { background: linear-gradient(180deg, rgba(7, 8, 9, .82), rgba(7, 8, 9, .92)); }
#pause-menu .panel { max-width: 420px; text-align: center; }
#pause-menu .panel-title { text-align: left; }
.pause-score { margin: 4px 0 22px; font-size: 14px; letter-spacing: .12em; color: var(--text-dim); }
.pause-score b { margin: 0 4px; font-family: var(--font-num); font-size: 26px; font-weight: 800; color: var(--accent); }
.pause-actions { display: flex; flex-direction: column; gap: 9px; }
.pause-actions .btn { width: 100%; }
.pause-hint { margin-top: 18px; font-size: 10.5px; letter-spacing: .14em; color: #6e6a61; }

/* ---------------------------------------------------------------------------
   6. 结算 #results
   --------------------------------------------------------------------------- */
#results { background: radial-gradient(ellipse 60% 55% at 50% 38%, rgba(18, 19, 22, .74) 0%, rgba(6, 7, 8, .94) 82%); }
#results .panel { max-width: 860px; text-align: center; }
#result-kicker { font-size: 10.5px; letter-spacing: .42em; text-indent: .42em; color: var(--text-mute); }
#result-title {
  margin: 10px 0 2px; font-size: clamp(46px, 4.6vw, 66px); font-weight: 900; line-height: 1.05; letter-spacing: .24em;
  text-indent: .24em; color: var(--win); text-shadow: 0 2px 18px rgba(245, 193, 90, .25); transform: skewX(-5deg);
}
#result-score { font-family: var(--font-num); font-size: 34px; font-weight: 800; letter-spacing: .18em; color: #f2ead9; }
.result-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 24px 0 26px;
  background: rgba(255, 255, 255, .07); border: 1px solid var(--line-soft);
}
.stat {
  display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 13px 8px 12px;
  background: rgba(10, 11, 13, .88);
}
.stat-label { font-size: 10px; letter-spacing: .18em; color: var(--text-mute); }
.stat > span:last-child {
  font-family: var(--font-num); font-size: 25px; font-weight: 800; line-height: 1.15; color: #f0e6d2;
}
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.result-actions .btn { min-width: 150px; }

/* 失败配色（JS 可在 #results 或 #result-title 上加 .lose/.defeat，或 data-result="lose"） */
#results.lose #result-title, #results.defeat #result-title, #results[data-result="lose"] #result-title, #result-title.lose,
#result-title.defeat {
  color: var(--lose); text-shadow: 0 2px 18px rgba(180, 69, 58, .30);
}
#results.lose #result-score,
#results.defeat #result-score,
#results[data-result="lose"] #result-score { color: #d9b2ac; }
#results.lose .panel::before, #results.defeat .panel::before, #results[data-result="lose"] .panel::before {
  background: linear-gradient(90deg, var(--danger), rgba(224, 82, 67, 0));
}

/* ---------------------------------------------------------------------------
   7. HUD #hud —— 全部 pointer-events:none
   --------------------------------------------------------------------------- */
#hud { position: fixed; inset: 0; z-index: 30; pointer-events: none; font-family: var(--font-ui); }
.hud-panel { background: var(--panel); border: 1px solid var(--line); clip-path: var(--cut-sm); }

/* 7.1 顶部分数栏 */
#topbar {
  position: absolute; top: var(--gap-edge); left: 50%; transform: translateX(-50%); display: flex; align-items: center;
  justify-content: center; gap: clamp(16px, 2vw, 30px); min-width: 300px; padding: 5px 22px; background: var(--panel);
  border: 1px solid var(--line); clip-path: var(--cut-sm);
}
.score-side { display: flex; align-items: center; gap: 8px; }
.score-player-side, .score-bot-side { flex: 0 0 auto; }
.score-label { font-size: 10px; letter-spacing: .18em; color: var(--text-mute); }
#score-player, #score-bot {
  min-width: 22px; font-family: var(--font-num); font-size: 30px; font-weight: 800; line-height: 1; text-align: center;
}
#score-player { color: var(--accent); }
#score-bot { color: #d0574c; }
#match-info {
  padding: 0 16px; text-align: center; border-left: 1px solid var(--line-soft); border-right: 1px solid var(--line-soft);
}
#match-diff { font-size: 11px; font-weight: 700; letter-spacing: .22em; color: var(--accent); }
#match-mode { margin-top: 2px; font-size: 9.5px; letter-spacing: .12em; color: var(--text-mute); }

/* 7.2 击杀信息 #killfeed */
#killfeed {
  position: absolute; top: var(--gap-edge); right: var(--gap-edge); display: flex; flex-direction: column;
  align-items: flex-end; gap: 4px; max-width: 46vw;
}
.kf-row {
  display: flex; align-items: center; gap: 8px; padding: 4px 9px 4px 11px; background: rgba(10, 12, 14, .72);
  border: 1px solid rgba(255, 255, 255, .07); border-right: 2px solid var(--accent); font-size: 12px; color: var(--text);
  white-space: nowrap; opacity: 1; transition: opacity .35s ease, transform .35s ease;
}
.kf-row.kf-old { opacity: .45; }
.kf-row.kf-out { opacity: 0; transform: translateX(14px); }
.kf-killer { color: #e7e0d2; }
.kf-weapon {
  padding: 1px 6px; border: 1px solid rgba(245, 166, 35, .28); background: rgba(245, 166, 35, .07);
  font-family: var(--font-num); font-size: 10.5px; letter-spacing: .06em; color: var(--accent);
}
.kf-victim { color: #d9695b; }
.kf-hs { font-size: 10px; letter-spacing: .06em; color: #ffd24a; }
.kf-hs:empty { display: none; }

/* 7.3 击杀横幅 / 中央消息 */
#kill-banner {
  position: absolute; top: 17%; left: 50%; transform: translate(-50%, -6px) scale(.97); opacity: 0;
  font-size: clamp(24px, 2.4vw, 34px); font-weight: 900; letter-spacing: .16em; white-space: nowrap; color: var(--win);
  text-shadow: 0 2px 12px rgba(0, 0, 0, .8), 0 0 22px rgba(245, 193, 90, .25);
  transition: opacity .16s ease, transform .16s ease;
}
#kill-banner.show { opacity: 1; transform: translate(-50%, 0) scale(1); }
#center-msg {
  position: absolute; top: 33%; left: 50%; transform: translate(-50%, 6px); opacity: 0; padding: 8px 26px;
  background: rgba(10, 12, 14, .60); border-left: 2px solid var(--accent); border-right: 2px solid var(--accent);
  font-size: 18px; letter-spacing: .24em; white-space: nowrap; color: #f0e6d2;
  transition: opacity .18s ease, transform .18s ease;
}
#center-msg.show { opacity: 1; transform: translate(-50%, 0); }
#center-msg.warn { color: #ff9a5c; border-color: var(--danger); background: rgba(46, 14, 10, .62); }

/* 7.4 动态准星 #crosshair
   JS 只需改 --spread（px，间隙）与 --ch-color（颜色）；.firing 时额外扩散。 */
#crosshair {
  position: absolute; left: 50%; top: 50%; width: 0; height: 0; --spread: 6px; --kick: 0px; --ch-len: 8px; --ch-thick: 2px;
  --ch-dot: 2px; --ch-color: #4dff6b;
}
.ch-line { position: absolute; background: var(--ch-color); box-shadow: 0 0 2px rgba(0, 0, 0, .9); }
.ch-top, .ch-bottom { width: var(--ch-thick); height: var(--ch-len); left: calc(var(--ch-thick) / -2); }
.ch-top { bottom: calc(var(--spread) + var(--kick)); }
.ch-bottom { top: calc(var(--spread) + var(--kick)); }
.ch-left, .ch-right { width: var(--ch-len); height: var(--ch-thick); top: calc(var(--ch-thick) / -2); }
.ch-left { right: calc(var(--spread) + var(--kick)); }
.ch-right { left: calc(var(--spread) + var(--kick)); }
.ch-dot {
  position: absolute; left: calc(var(--ch-dot) / -2); top: calc(var(--ch-dot) / -2); width: var(--ch-dot);
  height: var(--ch-dot); background: var(--ch-color); box-shadow: 0 0 3px rgba(0, 0, 0, .9);
}
#crosshair.ch-ak47 { --ch-len: 8px; --ch-thick: 2px; --ch-dot: 2px; }
#crosshair.ch-deagle { --ch-len: 11px; --ch-thick: 3px; --ch-dot: 3px; }
#crosshair.ch-awm { --ch-len: 10px; --ch-thick: 1px; --ch-dot: 0px; }
#crosshair.ch-awm .ch-dot { display: none; }
#crosshair.firing, #crosshair.spread { --kick: 6px; }

/* 7.5 命中反馈 #hitmarker */
#hitmarker {
  position: absolute; left: 50%; top: 50%; width: 0; height: 0; opacity: 0; transform: scale(.85);
  transition: opacity .07s ease, transform .07s ease;
}
#hitmarker.show { opacity: 1; transform: scale(1); }
.hm-line {
  position: absolute; left: -5px; top: -1px; width: 10px; height: 2px; background: #fff;
  box-shadow: 0 0 3px rgba(0, 0, 0, .8);
}
.hm-1 { transform: translate(-7px, -7px) rotate(45deg); }
.hm-2 { transform: translate(7px, -7px) rotate(-45deg); }
.hm-3 { transform: translate(7px, 7px) rotate(45deg); }
.hm-4 { transform: translate(-7px, 7px) rotate(-45deg); }
#hitmarker.headshot .hm-line { background: #ffd24a; }
#hitmarker.kill .hm-line { width: 13px; background: #ff5a45; }
#hitmarker.kill.show { transform: scale(1.18); }

/* 7.6 受伤方向 #damage-dir（容器 style 设 --dir，箭头按角度旋转） */
#damage-dir { position: absolute; inset: 0; opacity: 0; transition: opacity .18s ease; }
#damage-dir.show { opacity: 1; }
.dd-arrow { position: absolute; inset: 0; transform: rotate(var(--dir, 0deg)); transform-origin: 50% 50%; }
.dd-arrow::before {
  content: ""; position: absolute; left: 50%; top: 34px; margin-left: -15px; width: 0; height: 0;
  border-left: 15px solid transparent; border-right: 15px solid transparent; border-bottom: 26px solid rgba(224, 60, 44, .92);
}
.dd-arrow::after {
  content: ""; position: absolute; left: 50%; top: 42px; margin-left: -5px; width: 0; height: 0;
  border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 9px solid #ffe1cf;
}

/* 7.7 受伤 / 低血 / 复活保护 全屏暗角 */
#damage-vignette, #lowhp-vignette, #spawn-shield { position: absolute; inset: 0; opacity: 0; transition: opacity .25s ease; }
#damage-vignette {
  background: radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 0) 42%, rgba(150, 20, 12, .35) 72%, rgba(190, 25, 15, .62)
    100%);
}
#damage-vignette.show { opacity: 1; }
#lowhp-vignette {
  background: radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 0) 38%, rgba(120, 8, 6, .42) 70%, rgba(150, 10, 8, .72) 100%);
}
#lowhp-vignette.show { opacity: 1; animation: lowhp-pulse 1.15s ease-in-out infinite; }
@keyframes lowhp-pulse {
  0%, 100% { opacity: .55; }
  50% { opacity: 1; }
}
#spawn-shield {
  background: radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 0) 55%, rgba(70, 160, 220, .16) 82%, rgba(110, 200, 255, .28)
    100%); border: 1px solid rgba(120, 200, 255, .18);
}
#spawn-shield.show { opacity: 1; animation: shield-breathe 1.6s ease-in-out infinite; }
@keyframes shield-breathe {
  0%, 100% { opacity: .45; }
  50% { opacity: .90; }
}

/* 7.8 左下血量面板 */
#health-panel {
  position: absolute; left: var(--gap-edge); bottom: var(--gap-edge); display: flex; align-items: center; gap: 12px;
  min-width: 212px; padding: 10px 16px 10px 12px; background: var(--panel); border: 1px solid var(--line);
  border-left: 2px solid var(--accent); clip-path: var(--cut-sm);
}
#health-icon {
  display: flex; align-items: center; justify-content: center; flex: 0 0 auto; width: 30px; height: 30px;
  border: 1px solid var(--accent-dim); background: var(--accent-soft); color: var(--accent); font-family: var(--font-num);
  font-size: 19px; font-weight: 800; line-height: 1;
}
.hp-body { display: flex; flex-direction: column; gap: 6px; flex: 1 1 auto; }
#health-number-row { display: flex; align-items: baseline; gap: 6px; }
#health-value { font-family: var(--font-num); font-size: 32px; font-weight: 800; line-height: .9; color: #fff; }
.hp-label { font-size: 10px; letter-spacing: .16em; color: var(--text-mute); }
#armor-box { display: flex; align-items: baseline; gap: 3px; margin-left: auto; }
#armor-value { font-family: var(--font-num); font-size: 14px; color: #9fb6c9; }
.armor-label { font-size: 9px; letter-spacing: .10em; color: #65727c; }
#health-bar { width: 100%; height: 4px; background: rgba(255, 255, 255, .10); overflow: hidden; }
#health-bar-fill { width: 100%; height: 100%; background: linear-gradient(90deg, #d98a16 0%, #f5a623 60%, #ffce6a 100%); }
#health-panel.low { border-left-color: var(--danger); }
#health-panel.low #health-icon { border-color: rgba(224, 82, 67, .55); background: rgba(224, 82, 67, .14); color: #ff6a55; }
#health-panel.low #health-value { color: #ff6a55; animation: hp-beat .9s ease-in-out infinite; }
#health-panel.low #health-bar-fill { background: linear-gradient(90deg, #a32418 0%, #e05243 100%); }
@keyframes hp-beat {
  0%, 100% { opacity: 1; }
  50% { opacity: .55; }
}

/* 7.9 右下弹药面板 */
#ammo-panel {
  position: absolute; right: var(--gap-edge); bottom: var(--gap-edge); display: flex; flex-direction: column;
  align-items: flex-end; min-width: 216px; padding: 9px 16px 11px; background: var(--panel); border: 1px solid var(--line);
  border-right: 2px solid var(--accent); clip-path: var(--cut-sm);
}
#weapon-name {
  font-family: var(--font-num); font-size: 11px; letter-spacing: .26em; text-transform: uppercase; color: var(--accent);
}
#ammo-row { display: flex; align-items: baseline; justify-content: flex-end; gap: 7px; margin-top: 1px; }
#ammo-value { font-family: var(--font-num); font-size: 38px; font-weight: 800; line-height: 1; color: #fff; }
#ammo-reserve { font-family: var(--font-num); font-size: 15px; color: var(--text-mute); }
#reload-hint {
  margin-top: 4px; font-size: 10.5px; letter-spacing: .10em; color: var(--accent); opacity: 0; transition: opacity .12s ease;
}
#reload-hint.show { opacity: 1; }
#reload-bar {
  width: 100%; height: 3px; margin-top: 5px; background: rgba(255, 255, 255, .10); opacity: 0; transition: opacity .12s ease;
}
#reload-bar.show { opacity: 1; }
#reload-bar-fill { width: 0%; height: 100%; background: linear-gradient(90deg, #d98a16, #ffce6a); }
#ammo-panel.low { border-right-color: var(--danger); }
#ammo-panel.low #ammo-value { color: #ff6a55; }

/* 7.10 武器槽 #weapon-slots */
#weapon-slots { position: absolute; right: var(--gap-edge); bottom: calc(var(--gap-edge) + 112px); display: flex; gap: 6px; }
.slot {
  display: flex; align-items: center; gap: 7px; padding: 4px 9px 4px 5px; background: rgba(10, 12, 14, .72);
  border: 1px solid rgba(255, 255, 255, .08); color: var(--text-mute); font-size: 11px; letter-spacing: .06em;
  clip-path: var(--cut-sm);
}
.slot-key {
  display: flex; align-items: center; justify-content: center; width: 16px; height: 16px;
  border: 1px solid rgba(255, 255, 255, .18); font-family: var(--font-num); font-size: 10px; color: inherit;
}
.slot-name { font-size: 11px; letter-spacing: .02em; white-space: nowrap; }
.slot.active { color: #fff; border-color: rgba(245, 166, 35, .75); background: rgba(245, 166, 35, .15); }
.slot.active .slot-key { border-color: var(--accent); background: var(--accent); color: #16120a; font-weight: 700; }

/* 7.11 连杀 / FPS / 调试 */
#status-bar {
  position: absolute; left: var(--gap-edge); bottom: calc(var(--gap-edge) + 84px); display: flex; flex-direction: column;
  align-items: flex-start; gap: 3px;
}
#streak { min-height: 16px; font-size: 12.5px; letter-spacing: .18em; color: var(--accent); }
#streak.hot { color: #ffd24a; text-shadow: 0 0 14px rgba(255, 190, 60, .45); }
#fps { font-family: var(--font-num); font-size: 10.5px; letter-spacing: .08em; color: #6e6a61; }
#debug {
  position: absolute; top: calc(var(--gap-edge) + 46px); left: var(--gap-edge); display: none; min-width: 250px;
  max-width: 44vw; max-height: 46vh; overflow: hidden; padding: 9px 12px; background: rgba(6, 8, 10, .72);
  border: 1px solid rgba(245, 166, 35, .28); border-left: 2px solid var(--accent); font-family: var(--font-num);
  font-size: 11px; line-height: 1.55; color: #9fdcff; white-space: pre-wrap;
}
#debug.show { display: block; }

/* ---------------------------------------------------------------------------
   8. AWM 开镜 #scope-overlay —— 圆形视野 + 粗黑镜筒 + 细十字 + 刻度
   --------------------------------------------------------------------------- */
#scope-overlay { position: fixed; inset: 0; z-index: 20; pointer-events: none; overflow: hidden; }
.scope-vignette {
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 41.6vmin, rgba(0, 0, 0, .96) 42.1vmin,
    #000 100%); animation: scope-fade .14s ease-out;
}
.scope-lens {
  position: absolute; left: 50%; top: 50%; width: 84vmin; height: 84vmin; border: 8px solid #000; border-radius: 50%;
  overflow: hidden; transform: translate(-50%, -50%);
  box-shadow: inset 0 0 0 2px rgba(140, 148, 155, .28), inset 0 0 44px rgba(0, 0, 0, .75);
  animation: scope-zoom .16s ease-out;
}
.scope-glass {
  position: absolute; inset: 0; border-radius: 50%;
  background: radial-gradient(circle at 50% 44%, rgba(130, 160, 170, .07) 0%, rgba(0, 0, 0, 0) 58%), radial-gradient(circle at
    50% 50%, rgba(0, 0, 0, 0) 62%, rgba(0, 0, 0, .55) 100%);
}
.scope-cross-h {
  position: absolute; left: 0; right: 0; top: 50%; height: 1px; margin-top: -.5px; background: rgba(0, 0, 0, .88);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .05);
}
.scope-cross-v {
  position: absolute; top: 0; bottom: 0; left: 50%; width: 1px; margin-left: -.5px; background: rgba(0, 0, 0, .88);
  box-shadow: 1px 0 0 rgba(255, 255, 255, .05);
}
.scope-center-dot {
  position: absolute; left: 50%; top: 50%; width: 3px; height: 3px; margin: -1.5px 0 0 -1.5px; border-radius: 50%;
  background: rgba(0, 0, 0, .95);
}
.scope-ticks { position: absolute; }
.scope-ticks-t {
  left: 50%; top: 5.5%; width: 15px; height: 11%; margin-left: -7.5px;
  background: repeating-linear-gradient(to bottom, rgba(0, 0, 0, .82) 0 1px, transparent 1px 7px);
}
.scope-ticks-b {
  left: 50%; bottom: 5.5%; width: 15px; height: 11%; margin-left: -7.5px;
  background: repeating-linear-gradient(to top, rgba(0, 0, 0, .82) 0 1px, transparent 1px 7px);
}
.scope-ticks-l {
  top: 50%; left: 5.5%; height: 15px; width: 11%; margin-top: -7.5px;
  background: repeating-linear-gradient(to right, rgba(0, 0, 0, .82) 0 1px, transparent 1px 7px);
}
.scope-ticks-r {
  top: 50%; right: 5.5%; height: 15px; width: 11%; margin-top: -7.5px;
  background: repeating-linear-gradient(to left, rgba(0, 0, 0, .82) 0 1px, transparent 1px 7px);
}
@keyframes scope-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scope-zoom {
  from { transform: translate(-50%, -50%) scale(1.12); opacity: 0; }
  to { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

/* ---------------------------------------------------------------------------
   9. 加载页 #loading / 错误页 #fatal-error
   --------------------------------------------------------------------------- */
#loading {
  position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse 60% 55% at 50% 42%, #191712 0%, #0c0d0f 54%, #07080a 100%);
}
#loading::before {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, .28) 0 1px, transparent 1px 4px); opacity: .45;
  pointer-events: none;
}
#loading::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 0) 52%, rgba(0, 0, 0, .58) 100%); pointer-events: none;
}
.loading-box { position: relative; z-index: 1; text-align: center; }
.loading-logo {
  font-family: var(--font-num); font-size: 11px; letter-spacing: .62em; text-indent: .62em; color: var(--accent);
}
.loading-title {
  margin-top: 10px; font-size: clamp(34px, 3.6vw, 52px); font-weight: 900; letter-spacing: .28em; text-indent: .28em;
  color: #f4ecdc; transform: skewX(-5deg);
}
.loading-bar {
  width: min(340px, 62vw); height: 4px; margin: 26px auto 0; background: rgba(255, 255, 255, .10); overflow: hidden;
}
#loading-fill { width: 0%; height: 100%; background: linear-gradient(90deg, #c97c10 0%, #f5a623 60%, #ffd27a 100%); }
#loading-text { margin-top: 14px; font-size: 12px; letter-spacing: .18em; color: var(--text-mute); }
#fatal-error {
  position: fixed; inset: 0; z-index: 120; display: flex; align-items: center; justify-content: center;
  padding: var(--gap-edge); background: rgba(6, 6, 7, .97);
}
#fatal-error .panel { max-width: 760px; }
#fatal-error .panel-title { color: #ff6a55; }
#fatal-error .panel-title::before { background: linear-gradient(180deg, #ff6a55, var(--danger)); }
#fatal-error-text {
  margin: 4px 0 16px; max-height: 42vh; overflow: auto; padding: 12px 14px; background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(224, 82, 67, .28); font-family: var(--font-num); font-size: 12px; line-height: 1.6; color: #ffb3a6;
  white-space: pre-wrap; word-break: break-word;
}
.fatal-hint {
  padding-left: 10px; border-left: 2px solid rgba(245, 166, 35, .40); font-size: 12px; line-height: 1.7;
  color: var(--text-mute);
}

/* ---------------------------------------------------------------------------
   10. 低分辨率 / 高度不足 / 无障碍降级
   --------------------------------------------------------------------------- */
@media (max-height: 720px) {
  .menu-content { padding-top: 54px; padding-bottom: 26px; }
  #menu-title { font-size: clamp(48px, 6.6vw, 78px); }
  #menu-sub { margin-top: 20px; }
  .diff-section { margin-top: 22px; }
  .diff-desc { min-height: 0; font-size: 11px; }
  .menu-actions { margin-top: 22px; }
  #menu-best { margin-top: 18px; }
  .panel { padding: 24px 28px 22px; }
}
@media (max-width: 1100px) {
  .help-columns { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .help-tips { border-left: 0; border-top: 1px solid rgba(245, 166, 35, .18); padding-left: 0; padding-top: 14px; }
  .diff-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .diff-cards { grid-template-columns: minmax(0, 1fr); }
  .diff-desc { min-height: 0; }
  #menu::before, #menu::after { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------------------------------------------------------------------------
   沉浸模式（全屏 + Pointer Lock）
   --------------------------------------------------------------------------- */
html, body { overscroll-behavior: none; }
#game-canvas { touch-action: none; }
/* 鼠标锁定期间强制隐藏系统光标（Pointer Lock 本身也会隐藏，这里作为兜底） */
body.pointer-locked,
body.pointer-locked * { cursor: none !important; }