/* ============================================================
   像素跑酷 · 界面样式
   设计基调：深色 UI 外壳 + 复古像素游戏内画面
   所有装饰（边框、阴影、色块）均用 CSS 实现，不引入外部图片/字体
   ============================================================ */

:root {
  --bg: #0d1117;
  --bg-2: #131a24;
  --panel: #182130;
  --panel-2: #1f2b3d;
  --line: #2c3a4f;
  --txt: #e6edf3;
  --txt-dim: #93a4bb;
  --accent: #4ade80;      /* 军绿高亮 */
  --accent-2: #f2c14e;    /* 星徽金 */
  --danger: #ef4444;
  --xtu-red: #8c1b2a;     /* 湘大红 */
  --shadow: 0 0 0 2px #0d1117, 0 0 0 4px var(--line);
  --font: "Courier New", Consolas, "Menlo", monospace,
          "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  background:
    radial-gradient(1000px 600px at 50% -10%, #1b2637 0%, transparent 60%),
    var(--bg);
  color: var(--txt);
  font-family: var(--font);
  display: flex;
  justify-content: center;
  padding: 14px;
  min-height: 100%;
  -webkit-font-smoothing: none;
}

.app {
  width: 100%;
  max-width: 1080px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ----------------------------- 顶栏 ---------------------------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 46px; height: 46px; flex: 0 0 46px;
  display: grid; place-items: center;
  background: var(--xtu-red);
  color: #ffe9c7; font-size: 22px; font-weight: 700;
  border: 3px solid #ffd9a0;
  box-shadow: 0 4px 0 #4c0d16, 0 0 0 3px #0d1117;
  letter-spacing: 0;
}
.brand-text h1 { font-size: 20px; letter-spacing: 1px; }
.brand-text p { font-size: 11px; color: var(--txt-dim); letter-spacing: 1px; margin-top: 3px; }

.topbar-right { display: flex; align-items: center; gap: 8px; }
.badge {
  font-size: 12px; color: var(--accent-2);
  border: 2px solid #4a3a15; background: #221c0c;
  padding: 5px 10px; box-shadow: 0 3px 0 #0d1117;
}

/* ----------------------------- 按钮 ---------------------------- */
.btn {
  font-family: var(--font); font-size: 13px; letter-spacing: 1px;
  color: var(--txt); background: var(--panel-2);
  border: 2px solid var(--line); padding: 9px 16px;
  cursor: pointer; box-shadow: 0 4px 0 #0b0f15;
  transition: transform .06s ease, box-shadow .06s ease, background .15s ease;
  user-select: none;
}
.btn:hover { background: #26364d; }
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 #0b0f15; }
.btn-primary {
  background: var(--accent); color: #06210f; border-color: #1e6b3a; font-weight: 700;
}
.btn-primary:hover { background: #6ef0a0; }
.btn-ghost { background: transparent; }
.btn-lg { padding: 12px 26px; font-size: 15px; }
.btn-xs { padding: 4px 8px; font-size: 11px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ----------------------------- 舞台 ---------------------------- */
.stage {
  position: relative;
  background: #05070b;
  border: 3px solid var(--line);
  box-shadow: 0 0 0 3px #0d1117, 0 18px 40px rgba(0,0,0,.55);
  display: flex; justify-content: center; align-items: center;
  overflow: hidden;
  min-height: 300px;
  padding: 8px;
}
#game {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #7ec8e3;
}

/* ----------------------------- HUD ----------------------------- */
.hud {
  position: absolute; left: 10px; top: 10px; right: 10px;
  display: flex; flex-direction: column; gap: 6px;
  pointer-events: none; opacity: 0; transition: opacity .25s ease;
}
.hud.on { opacity: 1; }
.hud-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.hud-row-2 { justify-content: space-between; }
.hud-item {
  background: rgba(10,14,20,.72);
  border: 2px solid rgba(255,255,255,.14);
  padding: 4px 10px; display: flex; gap: 8px; align-items: baseline;
}
.hud-label { font-size: 10px; color: var(--txt-dim); letter-spacing: 1px; }
.hud-value { font-size: 15px; font-weight: 700; color: #fff; }
.hud-lives .hearts { letter-spacing: 2px; font-size: 15px; color: var(--danger); }
.hud-lives .hearts .off { color: #3a4453; }

.hud-theme {
  font-size: 11px; padding: 4px 10px; color: #cfe8ff;
  background: rgba(10,14,20,.72); border: 2px solid rgba(255,255,255,.14);
}
.hud-combo {
  font-size: 11px; padding: 4px 10px; color: var(--accent-2);
  background: rgba(10,14,20,.72); border: 2px solid rgba(242,193,78,.35);
  transition: transform .1s ease;
}
.hud-combo.pop { transform: scale(1.18); }
.hud-diff {
  font-size: 11px; padding: 4px 10px; color: #ffd9a0;
  background: rgba(10,14,20,.72); border: 2px solid rgba(255,180,90,.4);
}
/* 无缝过场进行中：场景标签柔和提示"前方将进入新场景"，不闪烁 */
.hud-theme.swap {
  color: var(--accent-2); border-color: rgba(242,193,78,.55);
  animation: swapIn .5s ease both;
}
@keyframes swapIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --------------------------- 切换横幅 -------------------------- */
.banner {
  position: absolute; left: 50%; top: 28%;
  transform: translate(-50%, -50%) scale(.8);
  padding: 10px 22px;
  background: rgba(13,17,23,.9);
  border: 3px solid var(--accent);
  color: #fff; font-size: 15px; letter-spacing: 3px;
  opacity: 0; pointer-events: none;
}
/* 过场横幅：与引擎 1.8s 过场的后半段对齐（自上方滑入 → 停留 → 淡出） */
.banner.show { animation: bannerIn 1.5s cubic-bezier(.2,.9,.25,1) forwards; }
@keyframes bannerIn {
  0%   { opacity: 0; transform: translate(-50%, -140%) scale(.85); }
  22%  { opacity: 1; transform: translate(-50%, -50%) scale(1.06); }
  34%  { transform: translate(-50%, -50%) scale(1); }
  72%  { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -74%) scale(.98); }
}

/* --------------------------- 覆盖层 ---------------------------- */
.overlay {
  position: absolute; inset: 0;
  background: rgba(5, 8, 12, .86);
  backdrop-filter: blur(2px);
  display: none; align-items: center; justify-content: center;
  padding: 16px; overflow: auto;
}
.overlay.show { display: flex; animation: fadeIn .22s ease; }
@keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }

.panel {
  width: min(660px, 100%);
  background: var(--panel);
  border: 3px solid var(--line);
  box-shadow: 0 0 0 3px #0d1117, 0 20px 50px rgba(0,0,0,.6);
  padding: 20px;
  display: flex; flex-direction: column; gap: 14px; align-items: center;
  text-align: center;
}
.panel-sm { width: min(380px, 100%); }
.panel-title { font-size: 22px; letter-spacing: 2px; }
.panel-sub { font-size: 12px; color: var(--txt-dim); letter-spacing: 1px; }

.help-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; }
.help-card {
  background: var(--panel-2); border: 2px solid var(--line);
  padding: 12px; text-align: left; font-size: 12px; line-height: 1.9;
}
.help-card b { color: var(--accent); letter-spacing: 2px; }
.help-card p { color: var(--txt-dim); }
kbd {
  background: #0b0f15; border: 1px solid var(--line);
  padding: 1px 6px; font-size: 11px; color: #fff;
}

/* --------------------------- 难度选择 -------------------------- */
.diff-block { width: 100%; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.diff-title {
  font-size: 12px; letter-spacing: 2px; color: var(--accent);
  display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; justify-content: center;
}
.diff-title i { font-style: normal; font-size: 10px; color: var(--txt-dim); letter-spacing: 1px; }
.diff-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; width: 100%; }
.diff {
  font-family: var(--font); cursor: pointer; text-align: center;
  display: flex; flex-direction: column; gap: 4px; align-items: center;
  padding: 12px 8px; color: var(--txt-dim);
  background: var(--panel-2); border: 3px solid var(--line);
  box-shadow: 0 4px 0 #0b0f15; transition: transform .12s ease, border-color .12s ease, color .12s ease;
}
.diff:hover { transform: translateY(-2px); border-color: #39506e; }
.diff:active { transform: translateY(2px); box-shadow: 0 1px 0 #0b0f15; }
.diff-name { font-size: 16px; letter-spacing: 2px; color: #fff; }
.diff-tag { font-size: 9px; letter-spacing: 2px; opacity: .8; }
.diff-desc { font-size: 10px; line-height: 1.6; }
.diff-mul { font-size: 10px; color: #7d8ba3; }
.diff.on {
  color: var(--txt); border-color: var(--accent);
  background: #16281d; box-shadow: 0 4px 0 #0b0f15, 0 0 14px rgba(46,204,113,.28);
}
.diff.on .diff-name { color: var(--accent); }
.diff.on .diff-mul { color: var(--accent-2); }
.diff.on::after { content: '● 已选'; font-size: 9px; letter-spacing: 1px; color: var(--accent); }

.diff-mini { display: flex; gap: 6px; align-items: center; justify-content: center; flex-wrap: wrap; font-size: 11px; color: var(--txt-dim); }
.diff-mini-btn.on { border-color: var(--accent); color: var(--accent); }

.theme-preview { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; font-size: 11px; color: var(--txt-dim); }
.tp { display: flex; align-items: center; gap: 6px; }
.sw { width: 14px; height: 14px; display: inline-block; border: 1px solid #000; }
.sw-forest { background: linear-gradient(#7ec8e3 50%, #4e8c3b 50%); }
.sw-field { background: linear-gradient(#8fd3f4 50%, #c0503c 50%); }
.sw-campus { background: linear-gradient(#6fb7e8 50%, #9aa0a6 50%); }

/* --------------------------- 结算面板 -------------------------- */
.result-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; width: 100%;
}
.res {
  background: var(--panel-2); border: 2px solid var(--line);
  padding: 10px 6px; display: flex; flex-direction: column; gap: 6px;
}
.res-label { font-size: 10px; color: var(--txt-dim); letter-spacing: 1px; }
.res-value { font-size: 18px; font-weight: 700; }
.res-main { grid-column: span 3; background: #12261a; border-color: #2f6b45; }
.res-main .res-value { font-size: 34px; color: var(--accent); }

.rank-line {
  display: none; font-size: 13px; color: var(--accent-2);
  border: 2px dashed #6b5418; padding: 6px 14px; background: #221c0c;
  animation: blink 1.1s steps(2, start) infinite;
}
.rank-line.on { display: block; }
@keyframes blink { 50% { opacity: .45 } }

.submit-row { display: flex; gap: 8px; width: 100%; justify-content: center; }
.name-input {
  font-family: var(--font); font-size: 13px; color: var(--txt);
  background: #0b0f15; border: 2px solid var(--line); padding: 9px 12px;
  width: min(240px, 60%); outline: none;
}
.name-input:focus { border-color: var(--accent); }
.submit-tip { font-size: 11px; color: var(--txt-dim); min-height: 14px; }

.board { width: 100%; background: #0b0f15; border: 2px solid var(--line); padding: 10px; text-align: left; }
.board-head { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--accent); letter-spacing: 2px; margin-bottom: 8px; }
.board-list { list-style: none; font-size: 12px; }
.board-list li { display: flex; justify-content: space-between; gap: 10px; padding: 4px 0; border-bottom: 1px dashed #223; color: var(--txt-dim); }
.board-list li b { color: #fff; font-weight: 700; }
.board-list li.me { color: var(--accent-2); }
.dtag {
  font-style: normal; font-size: 9px; letter-spacing: 1px;
  margin-left: 6px; padding: 1px 5px; color: #9fb4c9; border: 1px solid #3a4a63;
}
.board-empty { justify-content: center; color: #55637a; }

/* --------------------------- 触控栏 ---------------------------- */
.touchbar { display: none; gap: 10px; }
.tbtn {
  flex: 1; font-family: var(--font); font-size: 15px; letter-spacing: 2px;
  padding: 16px; color: #06210f; background: var(--accent);
  border: 3px solid #1e6b3a; box-shadow: 0 5px 0 #0b0f15; cursor: pointer;
}
.tbtn:active { transform: translateY(3px); box-shadow: 0 2px 0 #0b0f15; }

.foot { font-size: 11px; color: #5c6b81; text-align: center; line-height: 1.7; }

/* --------------------------- 响应式 ---------------------------- */
@media (max-width: 720px) {
  .help-grid { grid-template-columns: 1fr; }
  .diff-row { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: repeat(2, 1fr); }
  .res-main { grid-column: span 2; }
  .brand-text h1 { font-size: 16px; }
  .touchbar { display: flex; }
  body { padding: 8px; }
}