/* =========================================================
   青葵笔记 · 前台样式
   设计基调：浅灰底 + 纯白卡片，无圆角无阴影，正文灰、标题近黑，
   橙红作强调色。卡片网格 3 列，移动端降为 1 列。
   ========================================================= */

:root {
  --bg:          #fafbfc;
  --card:        #ffffff;
  --ink:         #0e0c1b;   /* 标题 */
  --text:        #6e6d76;   /* 正文 */
  --text-soft:   #9b9aa4;
  --line:        #eceef1;
  --line-strong: #dfe2e8;
  --accent:      #f0522e;   /* 强调：橙红 */
  --accent-soft: #fdeee9;
  --foot-bg:     #f2f5f7;

  --wrap: 1128px;
  --gap:  24px;
  --radius: 0px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--ink);
  color: #fff; padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 0; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }

/* ------------------------------------------------ 头部 */

.site-head { background: var(--bg); position: relative; }

.head-inner {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding-top: 40px;
  padding-bottom: 30px;
}

.brand { display: block; flex: 0 0 auto; line-height: 1.25; }

.brand-name {
  display: block;
  font-size: 25px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: .5px;
}
.brand-sub {
  display: block;
  font-size: 13px;
  color: var(--text-soft);
  margin-top: 3px;
}

.nav {
  flex: 1 1 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 26px;
  align-items: center;
  padding-top: 2px;
  min-width: 0;
}

.nav-link {
  position: relative;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  padding: 4px 0;
  white-space: nowrap;
  transition: color .16s ease;
}
.nav-link:hover { color: var(--accent); }
.nav-link.is-on { color: var(--accent); }
.nav-link.is-on::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -4px;
  height: 2px; background: var(--accent);
}
.ext-mark { font-size: 12px; opacity: .6; margin-left: 3px; vertical-align: 1px; }

.head-tools { display: flex; align-items: center; gap: 6px; flex: 0 0 auto; padding-top: 4px; }

.icon-btn {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  background: none; border: 0; cursor: pointer; color: var(--ink);
  border-radius: 50%;
  transition: background .16s ease;
}
.icon-btn:hover { background: #eef0f3; }
.icon-btn svg {
  width: 21px; height: 21px; fill: none;
  stroke: currentColor; stroke-width: 1.8; stroke-linecap: round;
}
.nav-toggle { display: none; }

.search-bar { border-top: 1px solid var(--line); background: var(--card); }
.search-inner { display: flex; gap: 12px; padding-top: 16px; padding-bottom: 16px; }
.search-inner input {
  flex: 1 1 auto;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  padding: 10px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  outline: none;
}
.search-inner input:focus { border-color: var(--accent); }
.search-inner button {
  border: 1px solid var(--ink); background: var(--ink); color: #fff;
  padding: 10px 24px; font-size: 15px; font-family: inherit; cursor: pointer;
  transition: opacity .16s ease;
}
.search-inner button:hover { opacity: .82; }

/* ------------------------------------------------ 卡片网格 */

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  padding-bottom: 20px;
  /* 同行卡片等高，让底部元信息横向对齐 */
  align-items: stretch;
}

.card {
  background: var(--card);
  padding: 28px;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: 0 6px 22px rgba(14, 12, 27, .07); }

.card-terms {
  display: flex; flex-wrap: wrap; gap: 5px 13px;
  font-size: 13px; color: var(--text-soft); margin-bottom: 10px;
}
.term { color: var(--text-soft); transition: color .16s ease; }
.term:hover { color: var(--accent); }
.term-tag { color: #a9a8b1; }
.term-tag:hover { color: var(--accent); }
.term-ext { color: var(--text-soft); }
.term-ext .ext-mark { font-size: 10px; opacity: .6; margin-left: 2px; }

.card-title {
  margin: 0 0 16px;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .2px;
}
.card-title a { transition: color .16s ease; }
.card-title a:hover { color: var(--accent); }

.card-cover {
  display: block;
  margin: 0 0 16px;
  overflow: hidden;
  background: #eef0f3;
  aspect-ratio: 16 / 9;
}
.card-cover img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .35s ease;
}
.card:hover .card-cover img { transform: scale(1.03); }

.card-excerpt {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px;
  font-size: 12px; color: var(--text-soft);
}
.meta-author { color: var(--text); }
.meta-dot { color: #c9c8d0; }

/* 无封面图时，卡片高度对齐 */
.card-noimg .card-title { margin-bottom: 12px; }

/* ------------------------------------------------ 页头 / 空态 / 分页 */

.page-head { padding: 14px 0 34px; }
.page-title {
  margin: 0 0 8px; font-size: 30px; font-weight: 700;
  color: var(--ink); letter-spacing: .5px;
}
.page-sub { margin: 0; font-size: 15px; color: var(--text-soft); max-width: 62ch; }

.head-tools-line {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px;
}
.chip {
  display: inline-block; padding: 6px 14px;
  border: 1px solid var(--line-strong); background: var(--card);
  font-size: 13px; color: var(--text); transition: all .16s ease;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.is-on { background: var(--accent); border-color: var(--accent); color: #fff; }

.empty { padding: 80px 0 110px; text-align: center; }
.empty-title { margin: 0 0 8px; font-size: 20px; color: var(--ink); font-weight: 700; }
.empty-sub { margin: 0; color: var(--text-soft); font-size: 15px; }

.pager {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 30px 0 60px; flex-wrap: wrap;
}
.pg {
  padding: 7px 14px; font-size: 14px; color: var(--text);
  border: 1px solid transparent; transition: all .16s ease;
}
a.pg:hover { border-color: var(--accent); color: var(--accent); }
.pg-cur { background: var(--ink); color: #fff; border-color: var(--ink); }
.pg.is-off { color: #c9c8d0; cursor: default; }
.pg-gap { color: #c9c8d0; padding: 7px 4px; }
.pg-nums { display: flex; gap: 2px; align-items: center; flex-wrap: wrap; }

/* ------------------------------------------------ 文章页 */

.post-wrap { background: var(--card); padding-bottom: 10px; margin-bottom: 60px; }

.post-head { padding: 46px 48px 26px; border-bottom: 1px solid var(--line); }

.post-title {
  margin: 0 0 20px; font-size: 34px; line-height: 1.35;
  font-weight: 700; color: var(--ink); letter-spacing: .3px;
}

.post-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 13px;
  font-size: 14px; color: var(--text-soft);
}
.post-meta .dot { color: #c9c8d0; }
.post-meta .author { color: var(--text); font-weight: 600; }
.post-meta .sec-link { color: var(--accent); }
.post-meta .sec-link:hover { text-decoration: underline; }

.post-body { padding: 34px 48px 10px; font-size: 17px; line-height: 1.85; }
.post-body > *:first-child { margin-top: 0; }
.post-body > *:last-child  { margin-bottom: 0; }

.post-body h1, .post-body h2, .post-body h3, .post-body h4 {
  color: var(--ink); font-weight: 700; line-height: 1.4;
  margin: 1.9em 0 .8em; letter-spacing: .2px;
}
.post-body h1 { font-size: 27px; }
.post-body h2 { font-size: 23px; padding-bottom: .35em; border-bottom: 1px solid var(--line); }
.post-body h3 { font-size: 19px; }
.post-body h4 { font-size: 17px; }

.post-body p  { margin: 1.15em 0; }
.post-body ul, .post-body ol { margin: 1.15em 0; padding-left: 1.5em; }
.post-body li { margin: .45em 0; }
.post-body li > ul, .post-body li > ol { margin: .4em 0; }

.post-body a { color: var(--accent); border-bottom: 1px solid rgba(240,82,46,.32); }
.post-body a:hover { border-bottom-color: var(--accent); }

.post-body strong { color: var(--ink); font-weight: 600; }

.post-body blockquote {
  margin: 1.5em 0; padding: 4px 0 4px 20px;
  border-left: 3px solid var(--accent);
  color: var(--text-soft); background: var(--bg);
  padding: 12px 18px;
}
.post-body blockquote p { margin: .5em 0; }

.post-body code {
  font-family: "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .88em; background: var(--bg); color: #d2402a;
  padding: 2px 6px; border: 1px solid var(--line);
}
.post-body pre {
  background: #f7f8fa; border: 1px solid var(--line);
  padding: 18px 20px; overflow-x: auto; margin: 1.5em 0; line-height: 1.6;
}
.post-body pre code { background: none; border: 0; padding: 0; color: var(--text); font-size: 14px; }

.post-body img { margin: 1.5em 0; }

/* 视频：保持 16:9 并自适应容器宽度 */
.post-body iframe,
.post-body video {
  max-width: 100%;
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  border: 0;
  margin: 1.5em 0;
  display: block;
  background: #f2f3f6;
}

/* 音频：撑满正文宽度，但不做 16:9，保持播放器自身高度 */
.post-body audio {
  width: 100%;
  margin: 1.2em 0;
  display: block;
}

/* 图文编辑产生的图片容器：居中且不溢出 */
.post-body figure { margin: 1.5em 0; text-align: center; }
.post-body figure img { margin: 0; }
.post-body figcaption {
  font-size: 14px; color: var(--text-soft); margin-top: .6em; text-align: center;
}

.post-body hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }

.post-body table {
  width: 100%; border-collapse: collapse; margin: 1.6em 0; font-size: 15px;
}
.post-body th, .post-body td { border: 1px solid var(--line-strong); padding: 10px 14px; text-align: left; }
.post-body th { background: var(--bg); color: var(--ink); font-weight: 600; }

.post-body .task-list-item { list-style: none; margin-left: -1.2em; }
.post-body input[type=checkbox] { margin-right: 8px; }

/* 文章底部：标签 + 分享 */

.post-foot { padding: 30px 48px 0; border-top: 1px solid var(--line); margin-top: 34px; }

.post-tags { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding-bottom: 26px; }
.post-tags-label { font-size: 13px; color: var(--text-soft); }
.tag-pill {
  font-size: 13px; padding: 4px 12px;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--line-strong); transition: all .16s ease;
}
.tag-pill:hover { border-color: var(--accent); color: var(--accent); }

.share {
  border-top: 1px solid var(--line);
  padding: 26px 0 34px;
  display: flex; flex-wrap: wrap; gap: 16px 24px; align-items: center;
}
.share-lead { font-size: 14px; color: var(--text-soft); margin-right: 4px; }

.share-btns { display: flex; flex-wrap: wrap; gap: 10px; }

.share-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 16px; font-size: 14px;
  border: 1px solid var(--line-strong); background: var(--card);
  color: var(--text); cursor: pointer; font-family: inherit;
  transition: all .16s ease;
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }
.share-btn.is-wx { border-color: #c5e3a8; background: #f2fae8; color: #4a7c22; }
.share-btn.is-wx:hover { border-color: #7ab648; color: #3c6a1a; }
.share-btn svg { width: 16px; height: 16px; fill: currentColor; }

/* 微信二维码弹层 */
.wx-mask {
  position: fixed; inset: 0; background: rgba(14,12,27,.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 90; padding: 20px;
}
.wx-mask[hidden] { display: none; }
.wx-modal {
  background: var(--card); padding: 30px 30px 26px;
  width: 100%; max-width: 320px; text-align: center;
  animation: pop .2s ease;
}
@keyframes pop { from { transform: scale(.94); opacity: 0 } to { transform: scale(1); opacity: 1 } }
.wx-modal h3 { margin: 0 0 6px; font-size: 17px; color: var(--ink); font-weight: 700; }
.wx-modal .wx-tip { margin: 0 0 16px; font-size: 13px; color: var(--text-soft); }
.wx-qr { width: 200px; height: 200px; margin: 0 auto 14px; background: #fff; border: 1px solid var(--line); }
.wx-qr img, .wx-qr canvas { width: 100%; height: 100%; display: block; }
.wx-modal .wx-close {
  margin-top: 4px; border: 0; background: none; cursor: pointer;
  font-size: 13px; color: var(--text-soft); font-family: inherit; padding: 6px 10px;
}
.wx-modal .wx-close:hover { color: var(--accent); }

/* 上一篇 / 下一篇 */

.post-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  border-top: 1px solid var(--line); margin-top: 10px;
}
.pn-item { padding: 24px 0; min-width: 0; }
.pn-item + .pn-item { border-left: 1px solid var(--line); padding-left: 34px; }
.pn-label { display: block; font-size: 12px; color: var(--text-soft); margin-bottom: 6px; }
.pn-title { font-size: 15px; color: var(--ink); display: block; transition: color .16s ease; }
.pn-item:hover .pn-title { color: var(--accent); }
.pn-next { text-align: right; }

/* 相关文章 */
.rel-block { padding-bottom: 70px; }
.rel-head {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 22px;
}
.rel-head h2 { margin: 0; font-size: 20px; color: var(--ink); font-weight: 700; }
.rel-head .rel-more { font-size: 13px; color: var(--text-soft); }
.rel-head .rel-more:hover { color: var(--accent); }

/* ------------------------------------------------ 归档 / 标签页 */

.archive-year {
  display: grid; grid-template-columns: 96px 1fr; gap: 28px;
  padding: 28px 0; border-bottom: 1px solid var(--line);
}
.archive-year:last-child { border-bottom: 0; }
.archive-count { font-size: 30px; color: var(--accent); font-weight: 700; line-height: 1; }
.archive-count small { display: block; font-size: 12px; color: var(--text-soft); font-weight: 400; margin-top: 8px; letter-spacing: 1px; }
.archive-list { margin: 0; padding: 0; list-style: none; min-width: 0; }
.archive-list li {
  display: flex; gap: 16px; align-items: baseline;
  padding: 7px 0; border-bottom: 1px dashed var(--line);
}
.archive-list li:last-child { border-bottom: 0; }
.archive-list time { flex: 0 0 48px; font-size: 13px; color: var(--text-soft); font-variant-numeric: tabular-nums; }
.archive-list a { font-size: 15.5px; color: var(--ink); transition: color .16s ease; }
.archive-list a:hover { color: var(--accent); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 12px; padding-bottom: 60px; }
.tag-cloud a {
  padding: 10px 20px; background: var(--card); border: 1px solid var(--line);
  font-size: 15px; color: var(--text); transition: all .16s ease;
}
.tag-cloud a:hover { border-color: var(--accent); color: var(--accent); }
.tag-cloud .n { color: var(--text-soft); font-size: 12px; margin-left: 5px; }
.tag-cloud a:hover .n { color: var(--accent); }

/* 关于页 */

.about-card { background: var(--card); padding: 44px 48px; margin-bottom: 26px; }
.about-card h2 {
  margin: 0 0 18px; font-size: 22px; color: var(--ink); font-weight: 700;
  padding-bottom: 14px; border-bottom: 1px solid var(--line);
}
.about-card p { margin: 1em 0; }
.about-card a { color: var(--accent); }
.about-card ul { padding-left: 1.4em; }
.about-card li { margin: .4em 0; }

.stat-row { display: flex; flex-wrap: wrap; gap: 40px; }
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-n { font-size: 32px; font-weight: 700; color: var(--accent); line-height: 1; }
.stat-l { font-size: 13px; color: var(--text-soft); }

/* ------------------------------------------------ 页脚 */

.site-foot { background: var(--foot-bg); margin-top: 70px; }
.foot-inner { padding-top: 42px; padding-bottom: 42px; text-align: center; }
.foot-line { margin: 0 0 10px; font-size: 14.5px; color: var(--text-soft); }
.foot-meta { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: center; align-items: center; }
.foot-meta a { color: var(--text-soft); transition: color .16s ease; }
.foot-meta a:hover { color: var(--accent); }

/* ------------------------------------------------ 响应式 */

@media (max-width: 1000px) {
  .grid { grid-template-columns: repeat(2, 1fr); --gap: 26px; }
  .nav { gap: 6px 20px; }
  .nav-link { font-size: 16px; }
  .post-head, .post-body, .post-foot { padding-left: 34px; padding-right: 34px; }
  .post-title { font-size: 29px; }
}

@media (max-width: 760px) {
  .wrap { padding: 0 20px; }
  .head-inner { padding-top: 26px; padding-bottom: 14px; flex-wrap: wrap; }
  .brand-name { font-size: 21px; }

  .nav-toggle { display: inline-flex; }
  .nav {
    order: 3; flex-basis: 100%;
    display: none; flex-direction: column; align-items: flex-start;
    gap: 0; padding-top: 6px; padding-bottom: 8px;
    border-top: 1px solid var(--line); margin-top: 8px;
  }
  .nav.is-open { display: flex; }
  /* 移动端保持原有观感，只微调到 16px 与桌面 17px 协调 */
  .nav-link { width: 100%; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
  .nav-link.is-on::after { display: none; }
  .nav-link.is-on { font-weight: 600; }

  .grid { grid-template-columns: 1fr; --gap: 20px; }
  .card { padding: 24px; }

  .page-title { font-size: 24px; }
  .post-wrap { margin-bottom: 40px; }
  .post-head { padding: 30px 24px 20px; }
  .post-title { font-size: 24px; }
  .post-body { padding: 26px 24px 6px; font-size: 16.5px; }
  .post-body h2 { font-size: 20px; }
  .post-body h3 { font-size: 17.5px; }
    .post-foot { padding: 24px 24px 0; }
  .share { gap: 12px; }
  .share-btn { flex: 1 1 auto; justify-content: center; }
  .post-nav { grid-template-columns: 1fr; }
  .pn-item + .pn-item { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
  .pn-next { text-align: left; }
  .archive-year { grid-template-columns: 1fr; gap: 14px; }
  .archive-count small { display: inline; margin-left: 8px; }
  .about-card { padding: 28px 24px; }
  .wx-qr { width: 176px; height: 176px; }
}