/* 劳伦斯实验室 · 全站共享样式 —— 比特辉光 (Bit Glow)
   深空黑蓝底 × 比特青 × 算力紫 · AI 时代数字比特 / 算力意象 */
:root {
  --night: #05070f;
  --night-2: #0b1120;
  --night-3: #131b30;
  --bit: #3fe0ff;        /* 主色 · 比特青 */
  --bit-soft: #9fe8ff;   /* 高亮青 */
  --bit-dim: #4e7c96;    /* 暗青 */
  --violet: #7c6cff;     /* 辅色 · 算力紫 */
  --violet-soft: #b8b0ff;
  --text: #e8ecf6;
  --text-dim: #8b94a8;
  --line: rgba(94, 160, 255, .16);
  --sans: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  /* 旧版「夜幕金殿」变量名兼容别名 —— 旧页面内联样式仍引用，值已换为新配色 */
  --gold: var(--bit);
  --gold-bright: var(--bit-soft);
  --gold-dim: var(--bit-dim);
  --serif: var(--sans);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  /* 比特矩阵网格 + 青/紫辉光 铺在深空黑蓝底上 */
  background:
    radial-gradient(1100px 520px at 50% -8%, rgba(63, 224, 255, .10), transparent 62%),
    radial-gradient(900px 480px at 86% 26%, rgba(124, 108, 255, .07), transparent 60%),
    linear-gradient(rgba(94, 160, 255, .042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(94, 160, 255, .042) 1px, transparent 1px),
    var(--night);
  background-size: auto, auto, 44px 44px, 44px 44px, auto;
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.7;
  min-height: 100vh;
}
::selection { background: rgba(63, 224, 255, .25); color: #fff; }
a { color: var(--bit-soft); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶部导航 */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; max-width: 1180px; margin: 0 auto;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--sans); }
.brand .mark {
  width: 42px; height: 42px; border: 1px solid var(--bit);
  border-radius: 10px; display: grid; place-items: center;
  color: var(--bit); font-size: 1.3rem; font-weight: 700;
  background: linear-gradient(160deg, rgba(63, 224, 255, .16), transparent);
  box-shadow: 0 0 14px rgba(63, 224, 255, .18);
}
.brand .name { font-size: 1.25rem; letter-spacing: 4px; color: var(--bit-soft); }
.brand .name small { display: block; font-size: .62rem; letter-spacing: 2px; color: var(--text-dim); font-family: var(--mono); }
.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a { color: var(--text-dim); font-size: .92rem; letter-spacing: 1px; }
.site-nav a:hover, .site-nav a.active {
  color: var(--bit-soft); text-decoration: none;
  text-shadow: 0 0 12px rgba(63, 224, 255, .45);
}

main { max-width: 1180px; margin: 0 auto; padding: 24px; }

/* 首页主视觉（404 等页面复用） */
.hero { text-align: center; padding: 84px 16px 56px; }
.hero .lintel {
  display: inline-block; padding: 6px 18px; border: 1px solid var(--line);
  border-radius: 999px; color: var(--bit-dim); font-size: .8rem; letter-spacing: 6px;
  font-family: var(--mono);
}
.hero h1 {
  font-family: var(--sans); font-size: clamp(2.6rem, 7vw, 4.6rem);
  letter-spacing: 14px; margin: 28px 0 10px; font-weight: 800;
  background: linear-gradient(180deg, #c8f6ff 8%, var(--bit) 52%, var(--violet) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 28px rgba(63, 224, 255, .22));
}
.hero .slogan { font-size: 1.15rem; letter-spacing: 3px; color: var(--bit-soft); }
.hero .sub { margin-top: 14px; color: var(--text-dim); font-size: .95rem; letter-spacing: 1px; }

/* 展馆卡片（HUD 角标 + 辉光） */
.halls { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 18px; padding: 8px 0 40px; }
.hall {
  position: relative; display: block; padding: 26px 24px;
  background: linear-gradient(160deg, rgba(19, 27, 48, .9), rgba(11, 17, 32, .94));
  border: 1px solid var(--line); border-radius: 14px;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.hall:hover {
  transform: translateY(-4px); border-color: var(--bit);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .5), 0 0 26px rgba(63, 224, 255, .16), 0 0 46px rgba(124, 108, 255, .10);
  text-decoration: none;
}
.hall::before, .hall::after, .card::before, .card::after {
  content: ""; position: absolute; width: 16px; height: 16px; opacity: .65; pointer-events: none;
}
.hall::before, .card::before { top: -1px; left: -1px; border-top: 2px solid var(--bit); border-left: 2px solid var(--bit); border-top-left-radius: 12px; }
.hall::after, .card::after { bottom: -1px; right: -1px; border-bottom: 2px solid var(--violet); border-right: 2px solid var(--violet); border-bottom-right-radius: 12px; }
.hall .glyph { font-size: 2rem; }
.hall h2 { font-size: 1.3rem; letter-spacing: 3px; color: var(--bit-soft); margin: 10px 0 6px; font-weight: 700; }
.hall p { color: var(--text-dim); font-size: .9rem; }
.hall .tag {
  position: absolute; top: 18px; right: 18px; font-size: .68rem; letter-spacing: 2px;
  padding: 3px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--bit-dim);
  font-family: var(--mono);
}
.hall .tag.hot { color: var(--violet-soft); border-color: rgba(124, 108, 255, .45); }
.hall .go { display: inline-block; margin-top: 14px; font-size: .85rem; color: var(--bit); letter-spacing: 2px; font-family: var(--mono); }

/* 段落块 */
.section { margin: 28px 0 8px; }
.section h2 {
  font-size: 1.4rem; letter-spacing: 4px; color: var(--bit-soft); font-weight: 700;
  margin-bottom: 14px; padding-left: 12px; border-left: 3px solid var(--bit);
}
.section p, .section li { color: var(--text-dim); font-size: .94rem; }
.section ul { padding-left: 22px; }

/* 更新 feed */
.feed { display: grid; gap: 12px; }
.feed .item {
  display: flex; gap: 14px; align-items: baseline; padding: 12px 16px;
  background: rgba(19, 27, 48, .5); border: 1px solid rgba(94, 160, 255, .12); border-radius: 10px;
}
.feed .date { font-size: .78rem; color: var(--bit-dim); white-space: nowrap; font-variant-numeric: tabular-nums; font-family: var(--mono); }
.feed .txt { font-size: .92rem; color: var(--text); }
.feed .txt small { color: var(--text-dim); margin-left: 8px; }

/* 内容页 */
.page-head { padding: 56px 16px 28px; text-align: center; }
.page-head h1 { font-size: 2.2rem; letter-spacing: 8px; color: var(--bit-soft); font-weight: 800; }
.page-head p { color: var(--text-dim); margin-top: 10px; font-size: .95rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.card {
  position: relative; display: block; padding: 20px;
  background: rgba(19, 27, 48, .55);
  border: 1px solid rgba(94, 160, 255, .14); border-radius: 12px;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.card:hover {
  border-color: var(--bit); transform: translateY(-3px); text-decoration: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .4), 0 0 20px rgba(63, 224, 255, .12);
}
.card h3 { font-size: 1.02rem; color: var(--bit-soft); letter-spacing: 1px; }
.card p { color: var(--text-dim); font-size: .84rem; margin-top: 6px; }

/* 比特点缀（0101 之类的小字） */
.bits { font-family: var(--mono); color: var(--bit-dim); letter-spacing: 3px; font-size: .72rem; }

/* 页脚 + 访问计数器 */
.site-footer {
  border-top: 1px solid var(--line); margin-top: 40px; padding: 28px 24px 40px;
  text-align: center; color: var(--text-dim); font-size: .82rem;
}
.site-footer a { color: var(--bit-dim); }
.site-footer .icp { margin-top: 8px; }
.counter {
  margin-top: 12px; font-family: var(--mono); font-size: .8rem;
  letter-spacing: 1px; color: var(--text-dim);
}
.counter b {
  color: var(--bit); font-weight: 600;
  text-shadow: 0 0 12px rgba(63, 224, 255, .55);
  font-variant-numeric: tabular-nums;
}
.counter .bits { font-size: .7rem; }

@media (max-width: 640px) {
  .site-header { flex-direction: column; gap: 12px; }
  .hero { padding: 56px 12px 40px; }
  .hero h1 { letter-spacing: 8px; }
  .halls { grid-template-columns: 1fr; }
}

/* 创意小游戏页：卡片内链接与开源徽标 */
.card > a { color: inherit; text-decoration: none; display: block; }
.card .gh {
  display: inline-block; margin-top: 12px; padding: 3px 10px;
  border: 1px solid rgba(94,160,255,.35); border-radius: 999px;
  color: #9fe8ff; font-family: var(--mono, monospace); font-size: .68rem;
  letter-spacing: .04em; text-decoration: none;
}
.card .gh:hover { border-color: #3fe0ff; background: rgba(63,224,255,.1); }