/* ============================================================
 * 坦克大战 · 样式表  style.css
 * 街机厅风格：深色底 + 霓虹描边 + 等宽字体
 * ============================================================ */

:root {
  --bg:        #06080f;
  --bg-2:      #0d1220;
  --panel:     #111828;
  --panel-2:   #18213a;
  --line:      #26314f;
  --ink:       #dfe8f8;
  --ink-dim:   #8593b3;
  --gold:      #ffd54a;
  --gold-dim:  #b8841f;
  --cyan:      #38e8c8;
  --red:       #ff4d6d;
  --radius:    10px;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas,
          "Liberation Mono", Menlo, "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(1100px 700px at 50% -10%, #16203a 0%, transparent 62%),
    radial-gradient(700px 500px at 90% 110%, #1b1430 0%, transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 12px 28px;
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
}

/* 背景暗纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(120, 160, 230, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 230, 0.035) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 78%);
}

/* ============================================================
 *  外框
 * ============================================================ */
.cabinet {
  position: relative;
  width: 100%;
  max-width: 880px;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  padding: 0 4px;
}

.logo {
  margin: 0;
  font-size: 20px;
  letter-spacing: 3px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-shadow: 0 0 14px rgba(255, 213, 74, 0.35);
}

.logo em {
  font-style: normal;
  font-size: 11px;
  letter-spacing: 2.4px;
  color: var(--gold-dim);
}

.logo-mark {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--gold);
  box-shadow: 0 0 12px var(--gold), 0 0 26px rgba(255, 213, 74, 0.5);
  align-self: center;
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(0.86); }
}

.topbar-tools { display: flex; gap: 8px; }

.icon-btn {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  font-size: 16px;
  font-family: inherit;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.icon-btn:hover { background: var(--panel-2); border-color: var(--cyan); }
.icon-btn:active { transform: scale(0.94); }

/* ============================================================
 *  舞台：战场 + 侧栏
 * ============================================================ */
.stage {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  justify-content: center;
}

/* ---------- 战场 ---------- */
.screen-wrap {
  position: relative;
  flex: 0 0 auto;
  width: min(512px, calc(100vw - 36px));
  aspect-ratio: 1 / 1;
  border-radius: 14px;
  overflow: hidden;
  background: #080b14;
  border: 2px solid #2b3a5c;
  box-shadow:
    0 0 0 1px rgba(56, 232, 200, 0.12),
    0 22px 60px rgba(0, 0, 0, 0.65),
    inset 0 0 70px rgba(0, 0, 0, 0.55);
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #0a0e18;
}

/* CRT 扫描线 */
.scanlines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.16) 0px,
    rgba(0, 0, 0, 0.16) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: multiply;
  opacity: 0.55;
}

/* 关卡横幅 */
.banner {
  position: absolute;
  left: 0;
  right: 0;
  top: 42%;
  text-align: center;
  font-size: clamp(14px, 3.4vw, 20px);
  letter-spacing: 3px;
  color: var(--gold);
  text-shadow: 0 0 18px rgba(255, 213, 74, 0.8), 0 2px 0 #000;
  pointer-events: none;
  opacity: 0;
}
.banner.is-on { animation: banner 2.2s ease-out forwards; }

@keyframes banner {
  0%   { opacity: 0; transform: translateY(12px) scale(0.9); }
  14%  { opacity: 1; transform: translateY(0) scale(1); }
  70%  { opacity: 1; }
  100% { opacity: 0; transform: translateY(-10px); }
}

/* ============================================================
 *  覆盖层 / 弹窗
 * ============================================================ */
.overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(4, 7, 14, 0.78);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 5;
}
.overlay.is-on { display: flex; }

.screen { display: none; width: 100%; max-width: 380px; }
.screen.is-on { display: block; animation: pop 0.22s ease-out; }

@keyframes pop {
  from { opacity: 0; transform: translateY(10px) scale(0.97); }
  to   { opacity: 1; transform: none; }
}

.panel {
  background: linear-gradient(180deg, rgba(24, 33, 58, 0.96), rgba(12, 17, 30, 0.96));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 20px;
  text-align: center;
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.kicker {
  margin: 0 0 6px;
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--cyan);
  text-transform: uppercase;
}
.kicker.danger { color: var(--red); }

.panel-title {
  margin: 0 0 6px;
  font-size: 26px;
  letter-spacing: 4px;
  color: var(--gold);
  text-shadow: 0 0 20px rgba(255, 213, 74, 0.4);
}
.panel-title.small { font-size: 20px; }

.panel-sub {
  margin: 0 0 14px;
  font-size: 12px;
  color: var(--ink-dim);
  letter-spacing: 1px;
}

.kv {
  display: grid;
  gap: 6px;
  margin: 14px 0 18px;
  padding: 12px;
  border-radius: 10px;
  background: rgba(6, 9, 17, 0.6);
  border: 1px solid rgba(38, 49, 79, 0.8);
}
.kv > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12px;
}
.kv span { color: var(--ink-dim); letter-spacing: 1px; }
.kv b { font-size: 16px; color: var(--ink); letter-spacing: 1px; }

.btn {
  display: block;
  width: 100%;
  margin: 8px 0 0;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 14px;
  letter-spacing: 2px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.16s, background 0.16s, color 0.16s;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(180deg, #ffe08a, var(--gold) 55%, #e0a91c);
  color: #1a1200;
  font-weight: 700;
  box-shadow: 0 6px 0 #8a6210, 0 10px 26px rgba(255, 213, 74, 0.28);
}
.btn-primary:hover { box-shadow: 0 6px 0 #8a6210, 0 12px 34px rgba(255, 213, 74, 0.46); }
.btn-primary:active { box-shadow: 0 3px 0 #8a6210; }

.btn-ghost {
  background: transparent;
  color: var(--ink-dim);
  border-color: var(--line);
}
.btn-ghost:hover { color: var(--ink); border-color: var(--cyan); }

.btn kbd {
  font-family: inherit;
  font-size: 10px;
  padding: 1px 5px;
  margin-left: 6px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(0, 0, 0, 0.3);
  vertical-align: 1px;
}
.btn-ghost kbd { background: rgba(255, 255, 255, 0.07); border-color: var(--line); }

.tips {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 5px;
  font-size: 11px;
  color: var(--ink-dim);
}
.tips b { color: var(--ink); }

.fineprint {
  margin: 12px 0 0;
  font-size: 10.5px;
  line-height: 1.7;
  color: #6c7896;
}
.hot { color: var(--red); }

/* ============================================================
 *  侧栏 HUD
 * ============================================================ */
.hud {
  flex: 0 0 176px;
  width: 176px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.hud-block {
  background: linear-gradient(180deg, rgba(24, 33, 58, 0.85), rgba(13, 18, 32, 0.85));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 11px;
}

.hud-label {
  font-size: 9.5px;
  letter-spacing: 2px;
  color: var(--ink-dim);
  margin-bottom: 3px;
}

.hud-value {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--gold);
  text-shadow: 0 0 14px rgba(255, 213, 74, 0.28);
  font-variant-numeric: tabular-nums;
}
.hud-value.accent-red { color: var(--red); text-shadow: 0 0 14px rgba(255, 77, 109, 0.32); }
.hud-value.accent-gold { font-size: 17px; letter-spacing: 2px; }

.hud-sub {
  font-size: 10px;
  color: var(--ink-dim);
  margin-top: 2px;
}
.hud-sub span { color: var(--ink); }

/* 剩余敌人：一格一台车 */
.enemy-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  min-height: 12px;
  margin-top: 3px;
}
.pip {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--red);
  box-shadow: 0 0 7px rgba(255, 77, 109, 0.55);
  animation: pipIn 0.22s ease-out both;
}
@keyframes pipIn {
  from { transform: scale(0.2); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.hud-help {
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  font-size: 10.5px;
  color: var(--ink-dim);
  line-height: 1.9;
}
.hud-help p { margin: 0; }

kbd {
  display: inline-block;
  min-width: 17px;
  padding: 0 4px;
  margin-right: 3px;
  font-family: inherit;
  font-size: 10px;
  text-align: center;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
}

/* ============================================================
 *  触屏操作
 * ============================================================ */
.touch {
  display: none;
  margin-top: 14px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}
.touch.is-visible { display: flex; }

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 58px);
  grid-template-rows: repeat(3, 58px);
  gap: 6px;
}

.dbtn {
  font-family: inherit;
  font-size: 18px;
  color: var(--ink);
  background: rgba(24, 33, 58, 0.9);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.1s, transform 0.08s;
}
.dbtn:active { background: var(--cyan); color: #04202a; transform: scale(0.94); }

.dbtn.up    { grid-area: 1 / 2; }
.dbtn.left  { grid-area: 2 / 1; }
.dbtn.down  { grid-area: 2 / 2; }
.dbtn.right { grid-area: 2 / 3; }

.fire-btn {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  font-family: inherit;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 3px;
  color: #2a0d14;
  background: radial-gradient(circle at 34% 30%, #ff9db0, var(--red) 58%, #b8233f);
  border: 3px solid #7d1329;
  box-shadow: 0 8px 0 #7d1329, 0 12px 28px rgba(255, 77, 109, 0.32);
  cursor: pointer;
}
.fire-btn:active {
  transform: translateY(5px);
  box-shadow: 0 3px 0 #7d1329;
}

/* ============================================================
 *  页脚
 * ============================================================ */
.foot {
  margin-top: 16px;
  text-align: center;
  font-size: 10px;
  letter-spacing: 1.6px;
  color: #4f5a75;
}

/* ============================================================
 *  响应式
 * ============================================================ */
@media (max-width: 760px) {
  body { align-items: flex-start; padding-top: 14px; }

  .stage { flex-direction: column; align-items: center; }

  .hud {
    width: min(512px, calc(100vw - 36px));
    flex: 0 0 auto;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .hud-help { display: none; }
  .hud-block:nth-child(4) { grid-column: span 2; }

  .logo { font-size: 16px; letter-spacing: 2px; }
  .logo em { display: none; }

  .panel { padding: 18px 16px; }
  .panel-title { font-size: 21px; letter-spacing: 3px; }
}

@media (max-width: 420px) {
  .dpad {
    grid-template-columns: repeat(3, 50px);
    grid-template-rows: repeat(3, 50px);
  }
  .fire-btn { width: 92px; height: 92px; font-size: 15px; }
}

/* 大屏时给战场一点呼吸空间 */
@media (min-width: 900px) {
  .hud { flex-basis: 190px; width: 190px; }
}

/* 尊重"减少动态效果"偏好 */
@media (prefers-reduced-motion: reduce) {
  .logo-mark, .pip { animation: none; }
  .screen.is-on { animation: none; }
}