:root {
  --panel: rgba(28, 36, 50, 0.78);
  --panel-solid: #1c2432;
  --line: rgba(255, 255, 255, 0.14);
  --text: #f4f6fa;
  --muted: #a9b3c4;
  --blue: #4f9bff;
  --red: #ff5a4a;
  --accent: #f2c14e;
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body {
  margin: 0; height: 100%; overflow: hidden; background: #1b2433; color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  user-select: none; -webkit-user-select: none;
}
/* chỉ chặn cử chỉ trình duyệt trong lúc chơi; menu vẫn cuộn được */
#app, #hud { touch-action: none; }
.screen { touch-action: pan-y; -webkit-overflow-scrolling: touch; overscroll-behavior: contain; }
#app canvas { display: block; position: fixed; inset: 0; }
.hidden { display: none !important; }
button { font: inherit; color: inherit; cursor: pointer; }

/* ---------- màn hình menu ---------- */
.screen {
  position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center;
  padding: 16px; overflow-y: auto;
  background: radial-gradient(circle at 30% 20%, #3b5c86 0%, #1b2433 70%);
}
#pause { background: rgba(12, 16, 24, 0.6); backdrop-filter: blur(4px); }
.panel {
  width: min(440px, 100%); background: var(--panel-solid); border: 1px solid var(--line);
  border-radius: 16px; padding: 22px; display: flex; flex-direction: column; gap: 14px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4); margin: auto;
}
h1 { margin: 0; font-size: 40px; letter-spacing: 2px; color: var(--accent); line-height: 1; }
h1 span { display: block; font-size: 14px; letter-spacing: 0; color: var(--muted); font-weight: 500; margin-top: 8px; }
h2 { margin: 0; font-size: 22px; letter-spacing: 1px; }
.field { display: flex; flex-direction: column; gap: 8px; font-size: 14px; color: var(--muted); }
.field b { color: var(--text); }
input[type="text"], .field input:not([type]) {
  background: #0f151f; border: 1px solid var(--line); border-radius: 10px; color: var(--text);
  padding: 10px 12px; font-size: 16px; user-select: text; -webkit-user-select: text;
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
.seg { display: flex; gap: 6px; }
.seg button {
  flex: 1; padding: 10px 6px; border-radius: 10px; border: 1px solid var(--line); background: #0f151f;
  font-size: 14px; color: var(--muted);
}
.seg button.on { background: #2b3a52; color: var(--text); border-color: var(--accent); }
.panel > button {
  padding: 13px; border-radius: 12px; border: 1px solid var(--line); background: #2b3a52; font-weight: 700;
  letter-spacing: 1px; font-size: 15px;
}
.panel > button.primary { background: var(--accent); color: #1b1b1b; border: none; font-size: 18px; }
.panel > button.ghost { background: transparent; color: var(--muted); }
.panel > button:disabled { opacity: 0.5; cursor: default; }
.keys { margin: 0; font-size: 12px; color: var(--muted); line-height: 1.6; }
body.touch .desk-only { display: none !important; }

/* ---------- HUD ---------- */
#hud { position: fixed; inset: 0; z-index: 10; pointer-events: none; }
#hud > * { position: absolute; }
#minimap {
  top: 14px; left: calc(14px + var(--safe-l)); width: 140px; height: 140px; border-radius: 10px;
  border: 3px solid rgba(20, 26, 36, 0.85);
}
#scorebox {
  top: 12px; left: 50%; transform: translateX(-50%); background: var(--panel); border-radius: 12px;
  padding: 8px 14px 6px; text-align: center; min-width: 270px;
}
#scorebox .row { display: flex; align-items: center; justify-content: center; gap: 10px; font-weight: 800; }
.cnt { min-width: 28px; padding: 2px 6px; border-radius: 6px; font-size: 16px; }
.cnt.blue { background: rgba(79, 155, 255, 0.25); color: #9cc7ff; }
.cnt.red { background: rgba(255, 90, 74, 0.25); color: #ffb0a6; }
.lbl { font-size: 13px; letter-spacing: 1px; }
.lbl.blue { color: var(--blue); }
.lbl.red { color: var(--red); }
.score { font-size: 24px; min-width: 64px; }
#scorebox .sub { font-size: 14px; font-weight: 700; margin-top: 3px; letter-spacing: 0.5px; }
#btn-settings {
  top: 12px; right: calc(14px + var(--safe-r)); width: 48px; height: 48px; border-radius: 50%; border: none;
  background: var(--panel); font-size: 24px; pointer-events: auto;
}
#btn-settings::after {
  content: "Esc"; position: absolute; left: 50%; top: 100%; transform: translateX(-50%); margin-top: 2px;
  font-size: 10px; color: var(--muted); text-shadow: 0 1px 2px #000;
}
body.touch #btn-settings::after { content: none; }
body.touch #btn-settings { width: 54px; height: 54px; }
#slots { top: 68px; right: calc(14px + var(--safe-r)); display: flex; gap: 6px; pointer-events: auto; }
.slot {
  position: relative; background: var(--panel); border: 2px solid transparent; border-radius: 6px; padding: 8px 10px;
  font-size: 12px; font-weight: 700; color: var(--muted); cursor: pointer; min-width: 78px;
}
.slot b { display: inline-block; background: rgba(255, 255, 255, 0.15); padding: 1px 5px; border-radius: 3px; margin-right: 5px; }
.slot.active { border-color: var(--accent); color: var(--text); }
.slot.empty { opacity: 0.45; }
.slot i { position: absolute; top: 1px; right: 4px; font-style: normal; font-size: 11px; color: var(--text); }
#killfeed { top: 112px; right: calc(14px + var(--safe-r)); display: flex; flex-direction: column; gap: 4px; align-items: flex-end; }
.feed { background: rgba(20, 26, 36, 0.7); padding: 4px 9px; border-radius: 6px; font-size: 13px; }
.feed span { color: var(--muted); }
.feed .me { color: var(--accent); }
.feed .ally { color: #9cc7ff; }
.feed .enemy { color: #ffb0a6; }

#crosshair { top: 50%; left: 50%; width: 0; height: 0; }
#crosshair i { position: absolute; background: #fff; box-shadow: 0 0 2px #000; transition: transform 0.12s; }
#crosshair i:nth-child(1), #crosshair i:nth-child(2) { width: 2px; height: 8px; left: -1px; }
#crosshair i:nth-child(3), #crosshair i:nth-child(4) { width: 8px; height: 2px; top: -1px; }
#crosshair i:nth-child(1) { top: -15px; }
#crosshair i:nth-child(2) { top: 7px; }
#crosshair i:nth-child(3) { left: -15px; }
#crosshair i:nth-child(4) { left: 7px; }
#crosshair.aim i:nth-child(1) { transform: translateY(5px); }
#crosshair.aim i:nth-child(2) { transform: translateY(-5px); }
#crosshair.aim i:nth-child(3) { transform: translateX(5px); }
#crosshair.aim i:nth-child(4) { transform: translateX(-5px); }
/* ống ngắm x4 */
#scope { inset: 0; display: none; }
#scope.show { display: block; background: radial-gradient(circle at center, transparent 0, transparent 34vmin, #000 34.4vmin); }
#scope i { position: absolute; background: rgba(0, 0, 0, 0.85); }
#scope .h { left: 0; right: 0; top: 50%; height: 2px; margin-top: -1px; }
#scope .v { top: 0; bottom: 0; left: 50%; width: 2px; margin-left: -1px; }

/* bảng người chơi (Tab) */
#scoreboard {
  top: 50%; left: 50%; transform: translate(-50%, -50%); width: min(860px, calc(100vw - 32px)); max-height: 82vh;
  overflow-y: auto; background: rgba(18, 24, 34, 0.92); border: 1px solid var(--line); border-radius: 14px;
  padding: 14px 16px; z-index: 6;
}
.sb-head { text-align: center; font-weight: 800; letter-spacing: 1px; margin-bottom: 10px; color: var(--accent); }
.sb-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.team h3 { margin: 0 0 6px; font-size: 14px; letter-spacing: 1px; display: flex; justify-content: space-between; }
.team.blue h3 { color: var(--blue); }
.team.red h3 { color: var(--red); }
.team table { width: 100%; border-collapse: collapse; font-size: 13px; }
.team th { text-align: left; font-weight: 600; color: var(--muted); font-size: 11px; padding: 3px 4px; }
.team td { padding: 4px; border-top: 1px solid rgba(255, 255, 255, 0.06); }
.team td.k, .team td.d, .team th:nth-child(3), .team th:nth-child(4) { text-align: center; width: 38px; }
.team td.nm { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.team td.nm em { color: var(--accent); font-style: normal; font-size: 11px; }
.team tr.me td { background: rgba(242, 193, 78, 0.12); }
.team tr.off td { opacity: 0.55; }
.team td.hp { width: 110px; white-space: nowrap; }
.hbar { display: inline-block; width: 60px; height: 6px; background: rgba(0, 0, 0, 0.5); border-radius: 3px; overflow: hidden; vertical-align: middle; margin-right: 6px; }
.hbar i { display: block; height: 100%; background: #6ee07a; }
.team.red .hbar i { background: #ff7a6a; }
.st { font-size: 11px; font-weight: 700; color: var(--muted); }
@media (max-width: 720px), (max-height: 430px) {
  .team table { font-size: 11px; }
  .team td.hp { width: 80px; }
  .hbar { width: 36px; }
}

#hitmarker { top: 50%; left: 50%; width: 22px; height: 22px; margin: -11px 0 0 -11px; opacity: 0; }
#hitmarker::before, #hitmarker::after {
  content: ""; position: absolute; left: 10px; top: 0; width: 2px; height: 22px; background: #fff;
}
#hitmarker::before { transform: rotate(45deg); }
#hitmarker::after { transform: rotate(-45deg); }
#hitmarker.show { opacity: 1; }
#hitmarker.head::before, #hitmarker.head::after { background: var(--red); }

#health {
  left: calc(80px + var(--safe-l)); top: 56%; display: flex; align-items: center; gap: 10px;
  font-size: 24px; font-weight: 800; text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}
#health .bar { width: 180px; height: 10px; background: rgba(0, 0, 0, 0.4); border-radius: 6px; overflow: hidden; }
#hp-fill { height: 100%; width: 100%; background: #6ee07a; transition: width 0.15s; }
#health.zombie #hp-fill { background: #b6e04f; }
#ammo {
  right: calc(28px + var(--safe-r)); bottom: 18px; font-size: 40px; font-weight: 800;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
}
#ammo small { font-size: 22px; opacity: 0.85; }
#hint {
  bottom: 70px; left: 50%; transform: translateX(-50%); background: var(--panel); padding: 8px 14px;
  border-radius: 8px; font-size: 14px; white-space: nowrap;
}
kbd {
  font-family: inherit; background: rgba(255, 255, 255, 0.18); border-radius: 4px; padding: 1px 6px; margin: 0 2px;
  font-weight: 700;
}
#banner {
  top: 24%; left: 50%; transform: translate(-50%, -10px); text-align: center; opacity: 0;
  transition: opacity 0.3s, transform 0.3s; text-shadow: 0 3px 8px rgba(0, 0, 0, 0.6);
}
#banner.show { opacity: 1; transform: translate(-50%, 0); }
#banner h2 { font-size: 40px; color: var(--accent); letter-spacing: 2px; white-space: nowrap; }
#banner p { margin: 6px 0 0; font-size: 17px; font-weight: 600; }
#damage-vignette {
  inset: 0; opacity: 0;
  background: radial-gradient(ellipse at center, rgba(255, 0, 0, 0) 55%, rgba(200, 0, 0, 0.75) 100%);
}
#dmg-layer { inset: 0; overflow: hidden; }
.dmg {
  position: absolute; left: 0; top: 0; font-weight: 900; font-size: 22px; color: #fff;
  text-shadow: 0 0 3px #000, 0 2px 2px #000;
}
.dmg.head { color: #ffcf3a; font-size: 28px; }
#lock-hint {
  top: 58%; left: 50%; transform: translateX(-50%); background: var(--panel); padding: 10px 16px; border-radius: 10px;
  font-weight: 600;
}
body.locked #lock-hint { display: none; }

/* ---------- điều khiển cảm ứng ---------- */
#touch-controls { inset: 0; display: none; pointer-events: auto; z-index: 1; }
/* nút cài đặt & ô vũ khí phải nằm trên vùng vuốt camera */
#btn-settings, #slots { z-index: 5; }
body.touch #touch-controls { display: block; }
#touch-controls > * { position: absolute; }
#look-zone { inset: 0; }
#joy-zone { left: 0; bottom: 0; width: 40%; height: 62%; }
#joystick {
  position: absolute; left: calc(40px + var(--safe-l)); bottom: 28px; width: min(150px, 38vh); height: min(150px, 38vh);
  border-radius: 50%; background: rgba(60, 90, 120, 0.45); border: 2px solid rgba(240, 220, 120, 0.45);
}
#stick {
  position: absolute; left: 50%; top: 50%; width: 42%; height: 42%; margin: -21% 0 0 -21%; border-radius: 50%;
  background: rgba(240, 220, 120, 0.75);
}
.tbtn {
  border-radius: 50%; border: 2px solid rgba(255, 255, 255, 0.25); background: rgba(70, 80, 96, 0.6);
  font-weight: 800; font-size: 13px; letter-spacing: 1px; color: #fff;
}
.tbtn:active, .tbtn.on { background: rgba(242, 193, 78, 0.55); }
#t-jump { left: calc(150px + var(--safe-l)); top: 22%; width: min(110px, 28vh); height: min(110px, 28vh); }
#t-aim { right: calc(70px + var(--safe-r)); top: 34%; width: min(78px, 20vh); height: min(78px, 20vh); }
#t-view { right: calc(170px + var(--safe-r)); top: 18%; width: min(60px, 16vh); height: min(60px, 16vh); font-size: 11px; }
#t-prone { right: calc(165px + var(--safe-r)); top: 40%; width: min(66px, 17vh); height: min(66px, 17vh); font-size: 12px; }
#t-board { right: calc(72px + var(--safe-r)); top: 12px; width: 44px; height: 44px; font-size: 18px; letter-spacing: 0; z-index: 5; }
#t-reload { right: calc(230px + var(--safe-r)); bottom: 50px; width: min(78px, 20vh); height: min(78px, 20vh); }
#t-fire {
  right: calc(40px + var(--safe-r)); bottom: 60px; width: min(130px, 32vh); height: min(130px, 32vh);
  background: rgba(230, 90, 80, 0.7); font-size: 16px;
}
body.touch #ammo { bottom: 4px; right: calc(60px + var(--safe-r)); font-size: 28px; }
body.touch #ammo small { font-size: 16px; }
body.touch #health { left: calc(30px + var(--safe-l)); top: 52%; font-size: 18px; }
body.touch #health .bar { width: 130px; }
body.touch #hint { bottom: 8px; font-size: 12px; }
body.touch #minimap { width: 110px; height: 110px; }

/* menu gọn khi màn hình thấp (điện thoại xoay ngang): 2 cột, nút VÀO TRẬN luôn hiện */
@media (max-height: 520px) {
  .screen { align-items: flex-start; padding: 10px 16px; }
  .menu-panel {
    width: min(760px, 100%); display: grid; grid-template-columns: 1fr 1fr; column-gap: 16px; row-gap: 8px;
    padding: 12px 16px;
  }
  .menu-panel h1 { grid-column: 1 / -1; font-size: 26px; }
  .menu-panel h1 span { display: inline; margin: 0 0 0 10px; font-size: 12px; }
  .menu-panel .field { gap: 4px; font-size: 12px; }
  .menu-panel .seg button { padding: 8px 4px; font-size: 12px; }
  .menu-panel input:not([type]) { padding: 7px 10px; }
  .menu-panel > button { grid-column: 1 / -1; padding: 10px; }
  .menu-panel > button.primary {
    position: sticky; bottom: 0; z-index: 2; box-shadow: 0 -8px 16px rgba(28, 36, 50, 0.9);
  }
  .menu-panel > button.ghost, .menu-panel .keys { display: none; }
  #pause .panel { gap: 8px; padding: 14px 16px; }
}

#rotate-hint {
  display: none; position: fixed; inset: 0; z-index: 100; background: #1b2433; align-items: center;
  justify-content: center; font-size: 20px; font-weight: 700; text-align: center; padding: 16px;
}
@media (orientation: portrait) and (pointer: coarse) {
  #rotate-hint { display: flex; }
}
@media (max-height: 430px) {
  #scorebox { padding: 4px 10px 3px; min-width: 220px; }
  .score { font-size: 18px; }
  #scorebox .sub { font-size: 11px; }
  .slot { padding: 5px 7px; font-size: 10px; min-width: 58px; }
  #slots { top: 62px; }
  #killfeed { top: 96px; }
  .feed { font-size: 11px; }
  #banner h2 { font-size: 26px; }
  #banner p { font-size: 13px; }
}
@media (max-width: 720px) {
  #banner h2 { font-size: 26px; }
  #hint { white-space: normal; max-width: 90vw; text-align: center; }
}