:root,
:root.light{
  color-scheme: light;
  --bg1: hsl(210 35% 96%);
  --bg2: hsl(210 30% 90%);
  --line: hsla(210 35% 28% / 0.12);
  --bold: hsla(210 35% 28% / 0.20);
  --glow: hsla(210 60% 35% / 0.10);

  --text: rgba(10,16,28,0.92);
  --text2: rgba(10,16,28,0.72);
  --card: rgba(255,255,255,0.76);
  --card-bd: hsla(210 35% 28% / 0.16);
  --shadow: rgba(0,0,0,0.18);
  --vignette: rgba(0,0,0,0.14);

  --link: hsla(210 45% 28% / 0.95);
  --hr: rgba(10,16,28,0.12);

  --codebg: rgba(10,16,28,0.08);
  --prebg: rgba(10,16,28,0.05);
  --quote: hsla(210 45% 28% / 0.12);

  --btn: hsla(210 45% 28% / 0.10);
  --btnbd: hsla(210 45% 28% / 0.20);
  --btnhv: hsla(210 45% 28% / 0.14);

  --copybg: rgba(10,16,28,0.06);
  --copybd: rgba(10,16,28,0.16);
  --copyhv: rgba(10,16,28,0.10);

  --page-bg-a: rgba(180,222,255,.34);
  --page-bg-b: rgba(126,196,255,.24);
  --page-bg-c: rgba(204,228,255,.26);
  --page-grad-1: #fbfdff;
  --page-grad-2: #f2f8ff;
  --page-grad-3: #edf5ff;
}

*{ box-sizing:border-box; }
html,body{ height:100%; margin:0; }
body{
  overflow:hidden;
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", Arial;
  background:
    radial-gradient(1200px 800px at 30% 20%, hsla(var(--h) 90% 70% / 0.10), transparent 55%),
    radial-gradient(1000px 700px at 70% 60%, hsla(calc(var(--h) + 50) 90% 70% / 0.10), transparent 60%),
    linear-gradient(180deg, var(--bg1), var(--bg2));
}

.bg{ position:fixed; inset:0; pointer-events:none; transform: translateZ(0); }
.bg::before{
  content:""; position:absolute; inset:-20%;
  background:
    repeating-linear-gradient(to right, transparent 0, transparent calc(var(--grid-size) * 5 - 1px),
      var(--bold) calc(var(--grid-size) * 5 - 1px), var(--bold) calc(var(--grid-size) * 5)),
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--grid-size) * 5 - 1px),
      var(--bold) calc(var(--grid-size) * 5 - 1px), var(--bold) calc(var(--grid-size) * 5)),
    repeating-linear-gradient(to right, transparent 0, transparent calc(var(--grid-size) - 1px),
      var(--line) calc(var(--grid-size) - 1px), var(--line) var(--grid-size)),
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--grid-size) - 1px),
      var(--line) calc(var(--grid-size) - 1px), var(--line) var(--grid-size));
  filter: drop-shadow(0 0 10px var(--glow));
  animation: rt_drift 18s linear infinite;
}
.bg::after{
  content:""; position:absolute; inset:-20%;
  background:
    radial-gradient(800px 300px at 50% 0%, hsla(var(--h) 90% 70% / 0.10), transparent 70%),
    linear-gradient(180deg, transparent 0%, hsla(var(--h) 90% 70% / 0.06) 50%, transparent 100%);
  mix-blend-mode: screen;
  opacity: 0.8;
  animation: rt_scan 6.5s ease-in-out infinite;
}
.vignette{
  position:fixed; inset:0; pointer-events:none;
  background: radial-gradient(1200px 900px at 50% 40%, transparent 55%, var(--vignette) 100%);
}

.wrap{
  position:relative;
  height:100%;
  overflow:auto;
  -webkit-overflow-scrolling: touch;
  padding: max(16px, env(safe-area-inset-top)) 12px max(18px, env(safe-area-inset-bottom));
}
.card{
  width: min(980px, 96vw);
  margin: 0 auto;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--card-bd);
  box-shadow: 0 10px 50px var(--shadow);
  backdrop-filter: blur(10px);
  padding: 22px 18px;
}
@media (min-width: 900px){
  .card{ padding: 32px 34px; }
  .wrap{ padding-left: 18px; padding-right: 18px; }
}

.topbar{
  display:flex; gap:10px; align-items:center; justify-content:space-between;
  margin-bottom: 12px; opacity:.95; flex-wrap:wrap;
}
.badge{
  display:inline-flex; align-items:center; gap:8px;
  padding: 6px 10px; border-radius: 999px;
  border: 1px solid rgba(127,127,127,0.20);
  background: rgba(127,127,127,0.10);
  color: var(--text2); font-size: 12px;
}
.dot{
  width:8px; height:8px; border-radius:50%;
  background: hsla(var(--h) 90% 70% / 0.75);
  box-shadow: 0 0 12px hsla(var(--h) 90% 70% / 0.35);
}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px; padding: 8px 12px; border-radius: 12px;
  border: 1px solid var(--btnbd);
  background: var(--btn);
  color: var(--text);
  text-decoration:none;
  font-weight: 800; font-size: 12px;
  user-select:none;
  transition: transform .15s ease, background .15s ease;
  white-space:nowrap;
}
.btn:hover{ background: var(--btnhv); transform: translateY(-1px); }

/* Markdown */
.markdown{ line-height: 1.78; font-size: 15px; color: var(--text); word-break: break-word; }
.markdown h1,.markdown h2,.markdown h3,.markdown h4{ line-height: 1.25; margin: 22px 0 12px; letter-spacing: .2px; }
.markdown h1{ font-size: clamp(22px, 4vw, 34px); margin-top: 4px; }
.markdown h2{ font-size: clamp(18px, 3vw, 24px); }
.markdown h3{ font-size: 18px; opacity: .95; }
.markdown h4{ font-size: 16px; opacity: .95; }
.markdown p{ margin: 10px 0; color: var(--text2); }
.markdown strong{ color: var(--text); }
.markdown a{ color: var(--link); text-decoration:none; }
.markdown a:hover{ text-decoration: underline; }
.markdown hr{ border:0; height:1px; background: var(--hr); margin: 18px 0; }
.markdown blockquote{
  margin: 14px 0; padding: 10px 12px;
  border-left: 4px solid var(--quote);
  background: rgba(127,127,127,0.08);
  border-radius: 12px;
  color: var(--text2);
}
.markdown ul, .markdown ol{ margin: 10px 0 10px 22px; color: var(--text2); }
.markdown li{ margin: 6px 0; }

.markdown pre{
  position: relative;
  margin: 12px 0;
  padding: 14px;
  border-radius: 14px;
  background: var(--prebg);
  border: 1px solid rgba(127,127,127,0.18);
  overflow:auto;
  box-shadow: 0 10px 30px rgba(0,0,0,0.10);
  tab-size: 2;
  -moz-tab-size: 2;
  white-space: pre;
}
.markdown pre code{
  display:block;
  padding:0;
  background: transparent;
  border-radius: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-variant-ligatures: none;
}
.markdown code{
  padding: 2px 6px;
  border-radius: 8px;
  background: var(--codebg);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
}

/* Copy button */
.copy-btn{
  position:absolute;
  top:10px; right:10px;
  z-index:2;
  display:inline-flex; align-items:center; gap:8px;
  padding:7px 10px;
  border-radius:10px;
  border:1px solid var(--copybd);
  background: var(--copybg);
  color: var(--text);
  font-weight:800;
  font-size:12px;
  cursor:pointer;
  user-select:none;
  -webkit-tap-highlight-color: transparent;
  opacity:0;
  transform: translateY(-2px);
  pointer-events:none;
  transition: opacity .15s ease, transform .15s ease, background .15s ease;
  backdrop-filter: blur(6px);
}
.copy-btn:hover{ background: var(--copyhv); }
.markdown pre:hover .copy-btn,
.markdown pre:focus-within .copy-btn{
  opacity:1;
  transform: translateY(0);
  pointer-events:auto;
}
@media (hover: none){
  .copy-btn{ opacity:1; transform:none; pointer-events:auto; }
}
.copy-btn .ico{
  width:14px; height:14px; display:inline-block;
  background: currentColor;
  -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2" ry="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>') center/contain no-repeat;
          mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2" ry="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>') center/contain no-repeat;
}

.markdown img{
  max-width: 100%;
  height:auto;
  display:block;
  margin:14px auto;
  border-radius:14px;
  border:1px solid rgba(127,127,127,0.18);
  box-shadow: 0 10px 30px rgba(0,0,0,0.18);
}
.markdown mjx-container{ overflow-x:auto; overflow-y:hidden; padding-bottom:2px; }

/* 兜底：隐藏任何第三方 code toolbar */
.markdown .code-toolbar > .toolbar,
.markdown .toolbar, .markdown .toolbar-item{ display:none !important; }

@keyframes rt_drift{ from { transform: translate3d(-2%, -2%, 0); } to { transform: translate3d( 2%,  2%, 0); } }
@keyframes rt_scan{ 0% { transform: translate3d(0,-8%,0); opacity: 0.35; } 50% { transform: translate3d(0, 8%,0); opacity: 0.85; } 100% { transform: translate3d(0,-8%,0); opacity: 0.35; } }