/* haha的知识库 — 黑白灰简约升级版 */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --ink-2: #555555;
  --ink-3: #9a9a9a;
  --line: #e8e8e4;
  --line-strong: #d4d4cf;
  --accent: #111111;
  --radius: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 8px 24px rgba(0,0,0,.07);
}

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}
.site-logo {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 2px;
}
.site-logo:hover { color: var(--ink-2); }
.site-nav { display: flex; gap: 26px; flex-wrap: wrap; justify-content: flex-end; row-gap: 6px; }
.site-nav a {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  padding: 4px 0;
  transition: color .2s;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a.active {
  color: var(--ink);
  font-weight: 600;
}
.site-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* 主内容 */
main.container { padding-top: 48px; padding-bottom: 72px; }

h1 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  line-height: 1.35;
}
.page-sub {
  color: var(--ink-3);
  font-size: 14px;
  margin-bottom: 36px;
}

h2 {
  font-size: 19px;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  letter-spacing: .5px;
}
h2 .h2-num {
  color: var(--ink-3);
  font-weight: 600;
  margin-right: 8px;
  font-size: 15px;
}
h3 { font-size: 16px; font-weight: 700; margin: 28px 0 10px; }

p { margin: 10px 0; }

a { color: var(--ink-2); text-decoration: none; border-bottom: 1px solid transparent; transition: color .2s, border-color .2s; }
a:hover { color: var(--ink); border-bottom-color: var(--ink-3); }

ul, ol { margin: 12px 0 12px 26px; }
li { margin: 8px 0; }

blockquote {
  border-left: 3px solid var(--line-strong);
  padding-left: 16px;
  color: var(--ink-2);
  margin: 16px 0;
}

code {
  background: #efefec;
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 14px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  color: var(--ink);
}

strong { font-weight: 700; }

/* 首页入口卡片 */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin: 32px 0 8px;
}
.entry-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px 22px;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: all .28s ease;
}
.entry-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.entry-card .entry-index {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 1px;
  margin-bottom: 14px;
}
.entry-card .entry-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .5px;
  margin-bottom: 4px;
}
.entry-card .entry-en {
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: .5px;
  margin-bottom: 12px;
}
.entry-card .entry-desc {
  font-size: 13px;
  color: var(--ink-2);
  line-height: 1.7;
}

/* 神话系列卡片 */
.myth-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 16px 0 28px;
}
.myth-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--ink);
  transition: all .22s ease;
}
.myth-card:hover {
  border-color: var(--line-strong);
  transform: translateX(3px);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}
.myth-card .myth-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}
.myth-card .myth-desc {
  font-size: 13px;
  color: var(--ink-2);
}
.myth-card .myth-date {
  font-size: 12px;
  color: var(--ink-3);
  float: right;
  margin-top: 2px;
}

/* 句子卡片（英语页） */
.sentence-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 14px 0;
  box-shadow: var(--shadow-sm);
}
.sentence-card .en {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
  line-height: 1.6;
}
.sentence-card .zh {
  font-size: 14.5px;
  color: var(--ink-2);
  margin-bottom: 8px;
}
.sentence-card .point {
  display: inline-block;
  font-size: 12.5px;
  color: var(--ink-2);
  background: #f1f1ee;
  border-radius: 6px;
  padding: 3px 10px;
  line-height: 1.6;
}
.sentence-card .point b { color: var(--ink); font-weight: 600; }

/* 词表 */
.vocab-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px 20px;
  margin: 16px 0;
}
.vocab-item {
  font-size: 14px;
  color: var(--ink-2);
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}
.vocab-item b { color: var(--ink); font-weight: 600; margin-right: 6px; }

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 26px 0;
  font-size: 13px;
  color: var(--ink-3);
  text-align: center;
  letter-spacing: .5px;
}

/* 元信息 */
.meta { color: var(--ink-3); font-size: 13px; }

/* 分隔线 */
.divider { border: none; border-top: 1px solid var(--line); margin: 32px 0; }

/* 链接面包屑 */
.crumbs {
  font-size: 13px;
  color: var(--ink-3);
  margin-bottom: 28px;
}
.crumbs a { color: var(--ink-2); }
.crumbs a:hover { color: var(--ink); }

/* 待办 checkbox */
.task-item { list-style: none; }
input[type="checkbox"] { accent-color: var(--ink); margin-right: 6px; }

/* 手机适配 */
@media (max-width: 560px) {
  .container { padding: 0 18px; }
  h1 { font-size: 25px; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 13px; }
  .entry-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .entry-card { padding: 18px 16px; }
  main.container { padding-top: 36px; }
}

/* 首页分区标题 */
.section-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--ink-3);
  margin: 46px 0 0;
  display: flex;
  align-items: center;
  gap: 14px;
}
.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}
.section-title:first-of-type { margin-top: 36px; }