/* SCOND'S BLOG — 暖色纸本阅读主题 */

:root {
  --paper: #F7F0DF;
  --paper-soft: #FFF9EC;
  --ink: #2F281F;
  --ink-soft: #6E6254;
  --accent: #C7952E;
  --link: #80601A;
  --hairline: #E4D4AE;
  --nav-bg: rgba(247, 240, 223, 0.94);
  --code-bg: #EFE5CC;
  --btn-text: #FFF9EC;
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "Source Han Serif CN", "STSong", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 8px;
}

[data-theme="dark"] {
  --paper: #1E1A14;
  --paper-soft: #272117;
  --ink: #EDE2CB;
  --ink-soft: #B7AA8F;
  --accent: #C7952E;
  --link: #D9AC4A;
  --hairline: #4A4032;
  --nav-bg: rgba(30, 26, 20, 0.94);
  --code-bg: #3A3124;
  --btn-text: #1E1A14;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

img { max-width: 100%; height: auto; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- 导航 ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
  transition: background-color 0.25s ease;
}

.nav-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 3.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--ink);
  font-size: 1.05rem;
  white-space: nowrap;
}
.brand:hover { color: var(--link); text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.95rem;
  padding: 0.25rem 0;
}
.nav-links a:hover { color: var(--link); text-decoration: none; }
.nav-links a.is-active { color: var(--ink); font-weight: 600; border-bottom: 2px solid var(--accent); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--ink-soft);
}
.theme-toggle:hover { color: var(--link); }
.theme-toggle svg { width: 18px; height: 18px; }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: inline; }

/* ---------- 页头 ---------- */

.masthead {
  padding: 2rem 0 1.6rem;
  text-align: center;
}
.masthead .tagline {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 1rem;
}
.masthead::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 1px;
  background: var(--accent);
  margin: 1.2rem auto 0;
}

.page-head {
  padding-top: 3rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2.4rem;
}
.page-head--plain {
  border-bottom: 0;
  margin-bottom: 1.6rem;
}
.page-head h1 {
  margin: 0 0 0.35rem;
  font-size: 2rem;
  line-height: 1.3;
}
.page-head-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.35rem;
}
.page-head-row h1 { margin: 0; }
.rss-btn {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--link);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 0.1rem 0.62rem;
  line-height: 1.6;
  white-space: nowrap;
}
.rss-btn:hover {
  background: var(--accent);
  color: var(--btn-text);
  text-decoration: none;
}
.page-head .tagline {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.98rem;
}

/* ---------- 首页文章列表 ---------- */

.post-item {
  padding: 1.7rem 0;
  border-bottom: 1px solid var(--hairline);
}
.post-item:first-child { padding-top: 0.6rem; }
.post-item time {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}
.post-item h2 {
  margin: 0.4rem 0 0.2rem;
  font-size: 1.45rem;
  line-height: 1.42;
}
.post-item:first-child h2 { font-size: 1.7rem; }
.post-item h2 a { color: var(--ink); }
.post-item h2 a:hover { color: var(--link); text-decoration: none; }
.post-item .subtitle {
  margin: 0.25rem 0 0.6rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}
.post-item .excerpt {
  margin: 0 0 0.85rem;
  color: var(--ink-soft);
  font-size: 0.97rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2.2rem 0 3rem;
  font-family: var(--sans);
  font-size: 0.95rem;
}

/* ---------- 标签 ---------- */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.tag {
  display: inline-block;
  padding: 0.14rem 0.62rem;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.8rem;
  line-height: 1.6;
  background: #F1E3C3;
  color: #7A5B1E;
}
.tag[data-tag="思考"] { background: #E4E0D3; color: #5D5A4A; }
.tag[data-tag="跑步"] { background: #E4D9C8; color: #5F5340; }
.tag[data-tag="旅行"] { background: #DDE7D6; color: #4F5D45; }
.tag[data-tag="年度回顾"] { background: #E7DFD9; color: #6B5B52; }
.tag[data-tag="合集"] { background: #D8E1E4; color: #44565E; }
a.tag:hover { filter: brightness(0.97); text-decoration: none; }

[data-theme="dark"] .tag { background: #4A3E24; color: #E6C887; }
[data-theme="dark"] .tag[data-tag="思考"] { background: #3D3B31; color: #CFC9AE; }
[data-theme="dark"] .tag[data-tag="跑步"] { background: #41392D; color: #D8C7A8; }
[data-theme="dark"] .tag[data-tag="旅行"] { background: #33402F; color: #B9CFAE; }
[data-theme="dark"] .tag[data-tag="年度回顾"] { background: #40372F; color: #DCC6B8; }
[data-theme="dark"] .tag[data-tag="合集"] { background: #2F3B40; color: #AFC8D2; }

/* ---------- 文章页 ---------- */

.post-head {
  padding-top: 3.2rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2.2rem;
}
.post-head .tags { margin-bottom: 1.1rem; }
.post-head h1 {
  margin: 0 0 0.5rem;
  font-size: 2.05rem;
  line-height: 1.36;
}
.post-head .subtitle {
  margin: 0 0 1.05rem;
  color: var(--ink-soft);
  font-size: 1.18rem;
  line-height: 1.6;
}
.post-meta {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.post-cover {
  display: block;
  margin: 0 0 2.4rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}

.post-grid {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: block;
}
.post-main {
  max-width: 44rem;
  margin: 0 auto;
}

.post-content,
.prose {
  max-width: 44rem;
}
.prose h2 {
  font-size: 1.45rem;
  margin: 2.5rem 0 0.8rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--hairline);
  scroll-margin-top: 5rem;
}
.prose h3 {
  font-size: 1.2rem;
  margin: 2.1rem 0 0.6rem;
  scroll-margin-top: 5rem;
}
.prose p { margin: 0 0 1.25rem; }
.prose blockquote {
  margin: 1.7rem 0;
  padding: 0.35rem 0 0.35rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-size: 1.05rem;
}
.prose blockquote p { margin: 0 0 0.5rem; }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose a {
  text-decoration: underline;
  text-decoration-color: var(--hairline);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--link); }
.prose code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
}
.prose pre {
  background: #2F281F;
  color: #F7F0DF;
  padding: 1rem 1.2rem;
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.6;
  margin: 0 0 1.4rem;
}
.prose pre code {
  background: none;
  color: inherit;
  padding: 0;
}
.prose img {
  display: block;
  margin: 1.2rem auto;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}
.prose ul,
.prose ol {
  padding-left: 1.4rem;
  margin: 0 0 1.25rem;
}
.prose li { margin: 0.35rem 0; }
.prose .found-list {
  list-style: none;
  padding-left: 0;
  margin: 0.6rem 0 0;
}
.prose .found-list li {
  position: relative;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  margin: 0.55rem 0;
  padding-left: 1.05rem;
}
.prose .found-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink-soft);
  opacity: 0.8;
}
.copy-btn {
  margin-left: 0.55rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  line-height: 1;
  padding: 0.24rem 0.55rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.copy-btn:hover {
  border-color: var(--accent);
  color: var(--link);
}
.copy-btn.is-copied {
  border-color: var(--accent);
  color: var(--link);
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--hairline);
  margin: 2.5rem auto;
  max-width: 60%;
}
.prose table {
  border-collapse: collapse;
  margin: 1.4rem 0;
  width: 100%;
}
.prose th,
.prose td {
  border: 1px solid var(--hairline);
  padding: 0.5rem 0.75rem;
  font-size: 0.95rem;
}
.prose th {
  background: var(--paper-soft);
}
.prose strong { font-weight: 700; }

/* ---------- 目录 ---------- */

.toc {
  font-family: var(--sans);
  font-size: 0.88rem;
}
.toc h3 {
  margin: 0 0 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}
.toc ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.8rem;
  border-left: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.toc a { color: var(--ink-soft); }
.toc a:hover { color: var(--link); text-decoration: none; }

.toc-mobile {
  margin: 0 0 1.6rem;
  font-family: var(--sans);
  font-size: 0.9rem;
}
.toc-mobile summary {
  cursor: pointer;
  color: var(--ink-soft);
  padding: 0.35rem 0;
}
.toc-mobile ul {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0 0 0 0.8rem;
  border-left: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.toc-mobile a { color: var(--ink-soft); }

/* ---------- 上一篇 / 下一篇 ---------- */

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin: 3rem 0 0;
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
  font-family: var(--sans);
}
.post-nav a { color: var(--ink); }
.post-nav .label {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 0.2rem;
}
.post-nav .title { line-height: 1.5; }
.post-nav a:hover .title { color: var(--link); text-decoration: underline; }
.post-nav .next { text-align: right; }

/* ---------- 相关阅读 ---------- */

.related {
  margin-top: 2.6rem;
  font-family: var(--sans);
  font-size: 0.92rem;
}
.related h3 {
  margin: 0 0 0.8rem;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}
.related ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.related time {
  color: var(--ink-soft);
  font-size: 0.82rem;
  margin-right: 0.55rem;
}

/* ---------- 归档 ---------- */

.filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2.2rem;
  font-family: var(--sans);
}
.pill {
  background: var(--paper-soft);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 0.28rem 0.85rem;
  cursor: pointer;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-family: inherit;
}
.pill:hover { border-color: var(--accent); color: var(--link); }
.pill.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
.pill-count {
  color: var(--ink-soft);
  font-size: 0.78rem;
  margin-left: 0.25rem;
  opacity: 0.85;
}
.pill.is-active .pill-count { color: var(--paper); opacity: 0.8; }

.archive-year { margin-bottom: 2.4rem; }
.archive-year h2 {
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--sans);
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}
.archive-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.45rem 0;
  font-family: var(--sans);
}
.archive-item time {
  color: var(--ink-soft);
  font-size: 0.88rem;
  min-width: 4.4rem;
}
.archive-item a {
  color: var(--ink);
  font-size: 1rem;
}
.archive-item a:hover { color: var(--link); }
.archive-item .archive-tags {
  margin-left: auto;
  display: flex;
  gap: 0.4rem;
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--hairline);
  background: var(--paper-soft);
  padding: 2.4rem 0 3rem;
  font-family: var(--sans);
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.site-footer .wrap { max-width: 44rem; }
.footer-bio { margin: 0 0 0.3rem; }
.footer-contact { margin: 0 0 0.9rem; }
.footer-friends {
  margin: 0 0 1.2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 1.1rem;
}
.footer-label {
  color: var(--ink);
  font-weight: 600;
  margin-right: 0.2rem;
}
.footer-copy {
  margin: 0;
  border-top: 1px solid var(--hairline);
  padding-top: 1.1rem;
  font-size: 0.82rem;
}

/* ---------- 其他页面 ---------- */

.page-center {
  min-height: 58vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 1.25rem;
}
.page-center h1 {
  margin: 0 0 0.5rem;
  font-size: 3.5rem;
}
.page-center p { color: var(--ink-soft); font-family: var(--sans); }
.btn {
  display: inline-block;
  margin-top: 0.4rem;
  padding: 0.45rem 1.15rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--link);
  font-family: var(--sans);
}
.btn:hover {
  background: var(--accent);
  color: var(--btn-text);
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (max-width: 760px) {
  body { font-size: 16px; }
  .nav-inner { height: 3.4rem; padding: 0 1rem; gap: 0.6rem; }
  .brand { font-size: 0.95rem; }
  .nav-right { gap: 0.55rem; }
  .nav-links { gap: 0.85rem; }
  .nav-links a { font-size: 0.88rem; }
  .theme-toggle { width: 2rem; height: 2rem; }
  .theme-toggle svg { width: 16px; height: 16px; }
  .masthead { padding: 1.6rem 0 1.3rem; }
  .page-head { padding-top: 2.2rem; padding-bottom: 1.1rem; }
  .page-head h1 { font-size: 1.7rem; }
  .post-head { padding-top: 2.2rem; padding-bottom: 1.3rem; }
  .post-head h1 { font-size: 1.7rem; }
  .post-head .subtitle { font-size: 1.06rem; }
  .post-item h2 { font-size: 1.3rem; }
  .post-item:first-child h2 { font-size: 1.5rem; }
  .archive-item { flex-wrap: wrap; gap: 0.2rem 0.8rem; }
  .archive-item time { min-width: 0; }
  .archive-item .archive-tags { margin-left: 0; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav .next { text-align: left; }
}

@media (min-width: 1100px) {
  .post-grid {
    display: grid;
    grid-template-columns: minmax(0, 44rem) 14rem;
    gap: 3.5rem;
    justify-content: center;
    align-items: start;
  }
  .post-side {
    position: sticky;
    top: 5.5rem;
    grid-column: 2;
    grid-row: 1;
  }
  .post-main { grid-column: 1; grid-row: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}