/* ===== 24 种编程语言的 Hello World 程序 ===== */

:root {
  --brand: #2f6f9f;
  --brand-dark: #24577d;
  --brand-light: #eaf3fa;
  --text: #333;
  --text-dim: #777;
  --border: #e2e6ea;
  --code-bg: #f6f8fa;
  --term-bg: #1f2430;
  --term-fg: #d7dde8;
  --warn: #b9521a;
  --warn-bg1: #d9534f;
  --warn-bg2: #e07b39;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font: 15px/1.9 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: #fff;
}

a { color: var(--brand); }
a:hover { color: #e96900; }

/* ---------- 顶部：备案进行中 ---------- */
.beian-banner {
  background: linear-gradient(135deg, var(--warn-bg1), var(--warn-bg2));
  color: #fff;
  padding: 46px 20px 44px;
  text-align: center;
}

.banner-inner {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
}

.banner-text { text-align: center; }

.banner-main {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: 10px;
  line-height: 1.15;
  text-shadow: 0 3px 10px rgba(0, 0, 0, .2);
}

.banner-sub {
  font-size: 14px;
  letter-spacing: 2px;
  opacity: .92;
  margin-top: 8px;
}

/* ---------- 正文容器 ---------- */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 34px 20px 52px;
}

.site-name {
  font-size: 34px;
  line-height: 1.3;
  margin: 0 0 6px;
  color: #222;
  text-align: center;
  letter-spacing: 4px;
  font-weight: 800;
}

.site-slogan {
  font-size: 15px;
  color: var(--text-dim);
  text-align: center !important;
  margin: 0 0 26px !important;
}

.site-slogan::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  background: var(--brand);
  border-radius: 2px;
  margin: 14px auto 0;
}

.container > p { margin: 0 0 16px; text-align: justify; }

/* ---------- 目录 ---------- */
.toc {
  background: #fafbfc;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px 16px;
  margin: 26px 0 34px;
}
.toc-title { font-weight: 700; color: #444; margin-bottom: 8px; }
.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 14px;
}
.toc-list li { counter-increment: toc; flex: 0 0 auto; }
.toc-list li::before {
  content: counter(toc, decimal-leading-zero) ".";
  color: #aaa;
  margin-right: 5px;
  font-family: Consolas, Menlo, monospace;
  font-size: 12px;
}
.toc-list li:last-child::before { content: "附"; }

/* ---------- 各语言章节 ---------- */
.lang {
  padding-top: 14px;
  margin-bottom: 34px;
  border-top: 1px dashed var(--border);
}
.lang:first-of-type { border-top: none; }

.lang h2 {
  font-size: 21px;
  margin: 0 0 12px;
  color: #222;
  scroll-margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.lang h2 .num {
  font-family: Consolas, Menlo, monospace;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: var(--brand);
  border-radius: 4px;
  padding: 2px 8px;
  letter-spacing: .5px;
}
.lang h3 {
  font-size: 16px;
  color: var(--brand-dark);
  margin: 22px 0 10px;
}

.env {
  background: var(--brand-light);
  border-left: 3px solid var(--brand);
  padding: 8px 12px;
  border-radius: 0 4px 4px 0;
  font-size: 14px;
  margin-bottom: 14px !important;
  text-align: left !important;
}
.env b { color: var(--brand-dark); }

/* ---------- 代码块 ---------- */
pre {
  margin: 0 0 16px;
  padding: 13px 16px;
  border-radius: 6px;
  overflow-x: auto;
  font: 13px/1.75 Consolas, "Cascadia Mono", Menlo, "Courier New", monospace;
  tab-size: 4;
}
pre.code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  color: #24292e;
}
pre.term {
  background: var(--term-bg);
  color: var(--term-fg);
  border: 1px solid #2c3242;
}
pre .cm { color: #6a9955; }
pre.term .cm { color: #7f9a6a; }

/* ---------- 列表 ---------- */
.notes { margin: 0 0 16px; padding-left: 22px; }
.notes li { margin-bottom: 6px; }
ul.notes { list-style: disc; }
ol.notes { list-style: decimal; }

.rank {
  margin: 0 0 18px;
  padding-left: 22px;
  columns: 2;
  column-gap: 30px;
}
.rank.rank-3col { columns: 3; }
.rank li { break-inside: avoid; }

.source { font-size: 13px; color: var(--text-dim); }

/* ---------- 页脚备案 ---------- */
.site-footer {
  background: #f5f7f9;
  border-top: 1px solid var(--border);
  padding: 26px 20px 34px;
  text-align: center;
  font-size: 13.5px;
  color: #666;
}
.foot-note { margin: 0 0 12px; color: #999; font-size: 12.5px; }

.beian {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px 26px;
  flex-wrap: wrap;
}
.beian a {
  color: #555;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.beian a:hover { color: var(--brand); }
.beian-icon {
  width: 18px;
  height: 18px;
  object-fit: contain;
  flex: 0 0 auto;
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .beian-banner { padding: 34px 16px 32px; }
  .banner-main { font-size: 34px; letter-spacing: 6px; }
  .banner-sub { font-size: 12.5px; letter-spacing: 1px; }
  .site-name { font-size: 26px; }
  .title { font-size: 22px; }
  .rank, .rank.rank-3col { columns: 1; }
  pre { font-size: 12px; }
  .beian { flex-direction: column; gap: 8px; }
}