/* ==========================================================================
   测试牛 · 设计系统
   语言：墨色 + 朱砂；衬线正文、无衬线界面；明暗双主题
   ========================================================================== */

:root {
  --font-ui: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-text: "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  --max: 46rem;
  --max-wide: 64rem;
  --radius: 14px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #faf9f6;
  --bg-raised: #ffffff;
  --bg-soft: #f1efe9;
  --ink: #1c1b1a;
  --ink-2: #4a4844;
  --ink-3: #8a867e;
  --line: #e5e2da;
  --accent: #c0392b;
  --accent-soft: rgba(192, 57, 43, 0.08);
  --code-bg: #f4f2ec;
  --shadow: 0 1px 2px rgba(28, 27, 26, 0.05), 0 8px 24px rgba(28, 27, 26, 0.06);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #141312;
  --bg-raised: #1d1c1a;
  --bg-soft: #242220;
  --ink: #e8e6e1;
  --ink-2: #b5b1a9;
  --ink-3: #7d7a72;
  --line: #2e2c29;
  --accent: #e0655a;
  --accent-soft: rgba(224, 101, 90, 0.12);
  --code-bg: #201e1c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* ---------- 基础 ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.35s var(--ease), color 0.35s var(--ease);
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; text-underline-offset: 3px; }

::selection { background: var(--accent); color: #fff; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0.75rem; top: 0.75rem; }

/* ---------- 头部 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background-color 0.35s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: var(--max-wide);
  height: 3.75rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.logo:hover { text-decoration: none; color: var(--accent); }
.logo svg { color: var(--accent); }

.site-nav {
  display: flex;
  gap: 0.25rem;
  margin-left: auto;
}
.site-nav a {
  position: relative;
  color: var(--ink-2);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-size: 0.95rem;
  transition: color 0.2s, background-color 0.2s;
}
.site-nav a:hover { color: var(--ink); background: var(--bg-soft); text-decoration: none; }
.site-nav a.active { color: var(--accent); font-weight: 600; }
.site-nav a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateX(-50%);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--bg-raised);
  color: var(--ink-2);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, transform 0.4s var(--ease);
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: rotate(24deg); }
:root[data-theme="light"] .icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }

/* ---------- 首屏 Hero ---------- */

.hero {
  padding: clamp(4rem, 12vh, 7.5rem) 0 clamp(3rem, 8vh, 5rem);
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -6rem 0 auto auto;
  width: 22rem;
  height: 22rem;
  background: radial-gradient(circle, var(--accent-soft), transparent 65%);
  pointer-events: none;
  z-index: -1;
}

.hero-kicker {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 1.25rem;
}

.hero-title {
  font-family: var(--font-text);
  font-size: clamp(2.6rem, 7vw, 4.2rem);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 1.5rem;
}
.hero-title .accent { color: var(--accent); }

.hero-desc {
  color: var(--ink-2);
  font-size: 1.08rem;
  max-width: 34rem;
  margin: 0 0 2.25rem;
}

.hero-actions { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.72rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background-color 0.25s, color 0.25s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px var(--accent-soft); }
.btn-primary:hover { color: #fff; filter: brightness(1.06); }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: var(--bg-raised); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin: 3rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line);
}
.hero-stats dt {
  font-family: var(--font-text);
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
}
.hero-stats dd { margin: 0; color: var(--ink-3); font-size: 0.88rem; }

/* ---------- 区块 ---------- */

.section { padding: 2.5rem 0 3.5rem; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.section-head h2 {
  font-family: var(--font-text);
  font-size: 1.55rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.section-head h2::before {
  content: "";
  width: 0.45rem;
  height: 1.15rem;
  border-radius: 3px;
  background: var(--accent);
}

.more-link { color: var(--ink-3); font-size: 0.9rem; white-space: nowrap; }
.more-link:hover { color: var(--accent); }

/* ---------- 时间流（思考） ---------- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6.4rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--line);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 5.4rem 1fr;
  gap: 2rem;
  padding: 1.1rem 0;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: 6.4rem;
  top: 1.75rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--ink-3);
  transform: translateX(-3px);
  transition: border-color 0.25s, background-color 0.25s, transform 0.25s var(--ease);
}
.timeline-item:hover::before {
  border-color: var(--accent);
  background: var(--accent);
  transform: translateX(-3px) scale(1.35);
}

.timeline-item time {
  color: var(--ink-3);
  font-size: 0.85rem;
  text-align: right;
  padding-top: 0.15rem;
  font-variant-numeric: tabular-nums;
}

.timeline-body h3 {
  margin: 0 0 0.2rem;
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.5;
}
.timeline-body h3 a { color: var(--ink); transition: color 0.2s; }
.timeline-body h3 a:hover { color: var(--accent); text-decoration: none; }
.timeline-body p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.92rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 年份分组 */
.year-group { position: relative; margin-bottom: 2.5rem; }
.year-title {
  font-family: var(--font-text);
  font-size: 1.3rem;
  color: var(--ink-3);
  margin: 0 0 0.5rem;
  padding-left: 8.4rem;
}

/* ---------- 卡片（文章） ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 1.25rem;
}

.card {
  position: relative;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem 1.5rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s, border-color 0.3s, background-color 0.35s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}
.card-link { position: absolute; inset: 0; border-radius: var(--radius); }
.card-link:hover { text-decoration: none; }

.card-meta {
  color: var(--ink-3);
  font-size: 0.82rem;
  margin-bottom: 0.55rem;
  display: flex;
  gap: 0.45rem;
  align-items: center;
}
.dot { color: var(--ink-3); }

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.12rem;
  line-height: 1.5;
  font-weight: 600;
}
.card p {
  margin: 0 0 0.9rem;
  color: var(--ink-2);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tags { display: inline-flex; flex-wrap: wrap; gap: 0.45rem; }
.tag {
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.12rem 0.55rem;
  border-radius: 999px;
}

/* ---------- 页头 / 面包屑 ---------- */

.page-head { padding: 3rem 0 0.5rem; }
.page-head h1 {
  font-family: var(--font-text);
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin: 0.6rem 0 0.8rem;
}
.page-desc { color: var(--ink-2); margin: 0 0 1rem; max-width: 36rem; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--ink-3);
  font-size: 0.85rem;
}
.breadcrumb a { color: var(--ink-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span:last-child { color: var(--ink-2); }

/* ---------- 详情页 ---------- */

.article-page { padding-top: 2.5rem; padding-bottom: 4rem; }

.article-head h1 {
  font-family: var(--font-text);
  font-size: clamp(1.8rem, 4.5vw, 2.5rem);
  line-height: 1.35;
  margin: 1rem 0 0.9rem;
}
.article-meta {
  color: var(--ink-3);
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.75rem;
}

.summary-box {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.4rem;
  margin-bottom: 2.25rem;
}
.summary-box strong {
  display: block;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  margin-bottom: 0.3rem;
}
.summary-box p { margin: 0; color: var(--ink-2); font-size: 0.95rem; }

/* 正文排版 */
.prose {
  font-family: var(--font-text);
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--ink);
}
.prose p { margin: 0 0 1.4em; }
.prose h2, .prose h3, .prose h4 {
  font-family: var(--font-text);
  line-height: 1.5;
  margin: 2.2em 0 0.9em;
  scroll-margin-top: 5rem;
}
.prose h2 { font-size: 1.5rem; padding-left: 0.75rem; border-left: 4px solid var(--accent); }
.prose h3 { font-size: 1.25rem; }
.prose h4 { font-size: 1.1rem; }
.prose a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.prose a:hover { text-decoration-color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.5em; margin: 0 0 1.4em; }
.prose li { margin-bottom: 0.4em; }
.prose li::marker { color: var(--accent); }
.prose blockquote {
  margin: 0 0 1.4em;
  padding: 0.2rem 1.2rem;
  border-left: 3px solid var(--line);
  color: var(--ink-2);
}
.prose img { max-width: 100%; height: auto; border-radius: var(--radius); }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  border: 1px solid var(--line);
  padding: 0.15em 0.4em;
  border-radius: 6px;
}
.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  overflow-x: auto;
  margin: 0 0 1.5em;
  font-size: 0.88rem;
  line-height: 1.7;
}
.prose pre code { background: none; border: none; padding: 0; font-size: inherit; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5em;
  font-size: 0.95rem;
}
.prose th, .prose td { border: 1px solid var(--line); padding: 0.55rem 0.8rem; text-align: left; }
.prose th { background: var(--bg-soft); }

/* 上一篇 / 下一篇 */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.pager-link {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
  transition: border-color 0.25s, transform 0.25s var(--ease);
}
.pager-link:hover { text-decoration: none; border-color: var(--accent); transform: translateY(-2px); }
.pager-next { text-align: right; }
.pager-label { color: var(--ink-3); font-size: 0.8rem; }
.pager-title { color: var(--ink); font-weight: 600; font-size: 0.95rem; }
.pager-link.is-empty { visibility: hidden; }

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding: 2.5rem 0 3rem;
  transition: border-color 0.35s var(--ease);
}
.footer-inner { max-width: var(--max-wide); text-align: center; }
.footer-brand { font-family: var(--font-text); font-weight: 600; margin: 0 0 0.9rem; }
.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 0.9rem;
}
.footer-nav a { color: var(--ink-3); font-size: 0.88rem; }
.footer-nav a:hover { color: var(--accent); }
.footer-copy { color: var(--ink-3); font-size: 0.82rem; margin: 0; }

/* ---------- 浮动组件 ---------- */

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #f0a35e));
  z-index: 60;
  transition: width 0.1s linear;
}

.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--ink-2);
  cursor: pointer;
  opacity: 0;
  transform: translateY(0.75rem);
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s var(--ease), color 0.2s, border-color 0.2s;
  z-index: 40;
  box-shadow: var(--shadow);
}
.back-top.is-visible { opacity: 1; transform: none; pointer-events: auto; }
.back-top:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- 进入动效 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; transition-duration: 0.01ms !important; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 640px) {
  .header-inner { gap: 0.75rem; }
  .site-nav a { padding: 0.35rem 0.55rem; font-size: 0.9rem; }
  .timeline::before { left: 0.35rem; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.15rem; padding-left: 1.4rem; }
  .timeline-item::before { left: 0.35rem; top: 0.55rem; }
  .timeline-item time { text-align: left; }
  .year-title { padding-left: 1.4rem; }
  .pager { grid-template-columns: 1fr; }
  .pager-next { text-align: left; }
  .hero-stats { gap: 1.75rem; }
}

/* ---------- 搜索 ---------- */

.search-entry {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--bg-raised);
  color: var(--ink-2);
  transition: color 0.2s, border-color 0.2s;
}
.search-entry:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.search-entry.active { color: var(--accent); border-color: var(--accent); }

.search-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.5rem 0 1rem;
  padding: 0.85rem 1.2rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-3);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  color: var(--accent);
}
.search-box input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ink);
  font-size: 1.05rem;
  font-family: var(--font-ui);
}
.search-box input::placeholder { color: var(--ink-3); }
.search-box kbd {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-3);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0.1rem 0.45rem;
}

.search-filters { display: flex; gap: 0.6rem; margin-bottom: 0.5rem; }
.chip {
  padding: 0.35rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--ink-2);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.is-on { background: var(--accent); border-color: var(--accent); color: #fff; }

.search-status { color: var(--ink-3); font-size: 0.88rem; min-height: 1.4rem; margin: 0.5rem 0 1rem; }

.search-results { list-style: none; margin: 0; padding: 0; }
.search-hit {
  padding: 1.1rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
}
.hit-meta { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.3rem; }
.hit-meta time { color: var(--ink-3); font-size: 0.8rem; }
.hit-type {
  font-size: 0.72rem;
  padding: 0.08rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.search-hit h3 { margin: 0 0 0.3rem; font-size: 1.08rem; font-weight: 600; }
.search-hit h3 a { color: var(--ink); }
.search-hit h3 a:hover { color: var(--accent); text-decoration: none; }
.search-hit p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.92rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-hit mark {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}

/* ---------- 标签 ---------- */

a.tag { transition: background-color 0.2s, color 0.2s; }
a.tag:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* 卡片整卡链接之上，保证标签可点 */
.card .tags { position: relative; z-index: 1; }

.timeline-body .tags { display: flex; margin-top: 0.4rem; }

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.25rem 0 0.5rem;
}
.tag-cloud .chip { text-decoration: none; }
.tag-cloud .chip:hover { text-decoration: none; }
.chip-count {
  margin-left: 0.35rem;
  font-size: 0.75em;
  opacity: 0.65;
}