/* ===========================================================
   空战演习 · 界面
   沿用设计台的纸张 / 钢笔线基调，颜色全部走 CSS 变量（跟着纸张主题走）
   =========================================================== */

:root{
  --paper:      #f4efe4;
  --paper-2:    #ece5d6;
  --ink:        #23262e;
  --ink-soft:   #5a6070;
  --ink-faint:  #8e93a1;
  --accent:     #b2543a;
  --accent-2:   #3c6e8f;
  --card:       #fbf8f1;
  --card-hi:    #ffffff;
  --panel-a:    #f7f3ea;
  --panel-b:    #efe8d9;
  --panel-head-a:#fbf8f1;
  --panel-head-b:#f1ebdd;
  --hair:       rgba(35,38,46,.17);
  --hair-2:     rgba(35,38,46,.32);
  --hover:      rgba(35,38,46,.05);
  --shadow-c:   rgba(35,38,46,.22);
  --grain:      rgba(35,38,46,.055);
  --grain2:     rgba(35,38,46,.032);
  --float-bg:   rgba(251,248,241,.92);
  --font: "PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,system-ui,sans-serif;
  --hand: "Bradley Hand","Segoe Print","Comic Sans MS","Chalkboard SE",var(--font);
}

*{ box-sizing:border-box; }
html,body{ height:100%; margin:0; overflow:hidden; }
body{
  font-family:var(--font); color:var(--ink); background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
#app{ position:fixed; inset:0; }

canvas#view{ position:absolute; inset:0; width:100%; height:100%; display:block; }
canvas#hud{ position:absolute; inset:0; width:100%; height:100%; display:block; pointer-events:none; }

/* 纸纹颗粒 */
#app::after{
  content:""; position:absolute; inset:0; pointer-events:none; z-index:90;
  opacity:.5; mix-blend-mode:multiply;
  background-image:
    radial-gradient(var(--grain) 1px, transparent 1.2px),
    radial-gradient(var(--grain2) 1px, transparent 1.2px);
  background-size:3px 3px, 7px 7px;
  background-position:0 0, 2px 3px;
}

/* =================== 顶条 =================== */
#gamebar{
  position:absolute; left:0; right:0; top:0; z-index:40;
  display:flex; align-items:center; gap:10px; padding:9px 14px;
  pointer-events:none;
}
#gamebar > *{ pointer-events:auto; }
#gamebar .spacer{ flex:1; pointer-events:none; }
#gamebar .tag{
  font-family:var(--hand); font-size:14px; letter-spacing:.06em;
  padding:3px 12px; color:var(--ink);
  background:var(--float-bg); border:1.5px solid var(--ink);
  border-radius:9px 7px 10px 8px / 8px 10px 7px 9px;
  box-shadow:1.5px 1.5px 0 var(--shadow-c);
}

.tbtn{
  font-family:var(--font); font-size:12.5px; color:var(--ink); text-decoration:none;
  background:var(--card); border:1.6px solid var(--ink);
  border-radius:8px 5px 9px 6px / 6px 9px 5px 8px;
  padding:6px 12px; cursor:pointer; white-space:nowrap;
  box-shadow:1.5px 1.5px 0 var(--shadow-c);
  transition:transform .07s, background .15s;
}
.tbtn:hover{ background:var(--card-hi); transform:translate(-1px,-1px); }
.tbtn:active{ transform:translate(1px,1px); box-shadow:.5px .5px 0 var(--shadow-c); }
.tbtn.ghost{ background:var(--float-bg); border-style:dashed; }
.tbtn.primary{ background:var(--accent); color:var(--paper); border-color:var(--ink); }
.tbtn.primary:hover{ filter:brightness(1.08); }
.tbtn.big{ font-size:15px; padding:10px 26px; }

/* =================== 覆盖层 =================== */
.overlay{
  position:absolute; inset:0; z-index:60; display:none;
  align-items:center; justify-content:center;
  background:rgba(35,38,46,.34);
}
.overlay.show{ display:flex; }

.card{
  width:min(760px, 92vw); max-height:88vh; overflow:auto;
  padding:24px 30px 26px;
  background:linear-gradient(var(--panel-head-a), var(--panel-b));
  border:2px solid var(--ink);
  border-radius:16px 12px 18px 13px / 13px 18px 12px 16px;
  box-shadow:8px 8px 0 var(--shadow-c);
  text-align:center;
}
.card h1{
  margin:0 0 4px; font-size:30px; letter-spacing:.22em;
  font-family:var(--hand);
}
.card .sub{ font-size:13.5px; color:var(--ink-soft); margin-bottom:16px; letter-spacing:.05em; }
.card .sub b{ font-family:var(--hand); font-size:16px; color:var(--accent); }

.cols{ display:grid; grid-template-columns:1fr 1fr; gap:8px 26px; text-align:left; margin-bottom:18px; }
.cols h3{
  font-size:12px; letter-spacing:.18em; color:var(--ink-faint);
  margin:6px 0 6px; padding-bottom:4px; border-bottom:1.4px dashed var(--hair);
}
.cols ul{ margin:0; padding-left:16px; }
.cols li{ font-size:12.5px; line-height:1.85; color:var(--ink-soft); }
.cols b{ color:var(--ink); }
.card .hint{ font-size:11px; color:var(--ink-faint); margin-top:14px; }
.card .tbtn{ margin:0 4px; }

@media (max-width: 700px){
  .cols{ grid-template-columns:1fr; }
  .card h1{ font-size:22px; }
}