/* ==========================================================================
   thoughts.dongyuanxiang.com — 随笔与思考
   与主站同一套「纸张」质感：米黄纸面、褐色墨字、衬线排版。
   ========================================================================== */

:root {
  color-scheme: light;
  --ink: #4c4032;
  --ink-soft: rgba(76, 64, 50, 0.72);
  --ink-faint: rgba(76, 64, 50, 0.52);
  --paper: #f5edd8;
  --paper-lit: #fbf6e9;
  --surrounding: #d5cebf;
  --line: rgba(117, 95, 61, 0.2);
  --line-strong: rgba(117, 95, 61, 0.42);
  --accent: #9a743d;
  --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", SimSun, serif;
  --latin: Georgia, "Times New Roman", serif;
  --measure: 34em;
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  margin: 0;
  padding: clamp(14px, 3vw, 48px);
  color: var(--ink);
  background-color: var(--surrounding);
  background-image: linear-gradient(120deg, rgba(255, 255, 255, 0.3), transparent 45%);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

/* ---------- 纸张 ---------- */

.paper {
  position: relative;
  width: min(100%, 1080px);
  min-height: calc(100vh - clamp(28px, 6vw, 96px));
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 4vw, 46px) clamp(20px, 6vw, 84px) clamp(20px, 3vw, 34px);
  border: 1px solid rgba(117, 95, 61, 0.18);
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse at 16% 8%, rgba(154, 116, 61, 0.07), transparent 34%),
    radial-gradient(ellipse at 88% 92%, rgba(154, 116, 61, 0.09), transparent 38%),
    repeating-linear-gradient(0deg, rgba(116, 88, 47, 0.018) 0, rgba(116, 88, 47, 0.018) 1px, transparent 1px, transparent 5px);
  box-shadow: 0 18px 46px rgba(72, 59, 42, 0.2), inset 0 0 60px rgba(128, 96, 48, 0.06);
}

/* ---------- 页眉 ---------- */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: clamp(16px, 2.4vw, 24px);
  border-bottom: 1px solid var(--line);
}

.masthead--minimal {
  justify-content: flex-end;
  padding-bottom: clamp(12px, 1.8vw, 18px);
  border-bottom: 0;
}

.masthead-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.masthead-nav a {
  position: relative;
  color: var(--ink-soft);
  padding: 4px 0;
  text-decoration: none;
  transition: color 0.2s ease;
}

.masthead-nav a::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--ink-soft);
  content: "";
  transition: width 0.25s ease;
}

.masthead-nav a:hover,
.masthead-nav a:focus-visible {
  color: var(--ink);
  outline: none;
}

.masthead-nav a:hover::after,
.masthead-nav a:focus-visible::after {
  width: 100%;
}

/* ---------- 首页 hero ---------- */

.hero {
  padding: clamp(36px, 6vw, 64px) 0 clamp(26px, 4vw, 40px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-family: var(--latin);
  font-size: 11px;
  font-style: italic;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.5rem, 4vw, 3.6rem);
  font-weight: 500;
  letter-spacing: 0.22em;
  line-height: 1.25;
}

.hero p {
  max-width: 34em;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 2;
  letter-spacing: 0.04em;
}

/* ---------- 文章列表 ---------- */

.article-section {
  flex: 1;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}

.section-head h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.section-head .count {
  color: var(--ink-faint);
  font-size: 11px;
  letter-spacing: 0.14em;
  font-variant-numeric: tabular-nums;
}

.article-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-item {
  border-bottom: 1px solid var(--line);
}

.article-link {
  position: relative;
  display: grid;
  grid-template-columns: 4.2em minmax(0, 1fr) auto;
  align-items: baseline;
  gap: clamp(14px, 2vw, 30px);
  padding: clamp(22px, 3vw, 30px) 8px;
  text-decoration: none;
  transition: transform 0.3s ease;
}

.article-link::before {
  position: absolute;
  top: 0;
  right: 8px;
  bottom: 0;
  left: 8px;
  background: linear-gradient(90deg, rgba(255, 253, 247, 0.7), rgba(255, 253, 247, 0.2));
  border-left: 2px solid rgba(154, 116, 61, 0.5);
  content: "";
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 0;
}

.article-link:hover::before,
.article-link:focus-visible::before {
  opacity: 1;
}

.article-link:focus-visible {
  outline: none;
}

.article-link > * {
  position: relative;
  z-index: 1;
}

.article-date {
  color: var(--ink-faint);
  font-family: var(--latin);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.article-main {
  min-width: 0;
}

.article-title {
  display: block;
  margin: 0;
  font-size: clamp(1.28rem, 2vw, 1.6rem);
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.5;
  transition: color 0.2s ease;
}

.article-subtitle {
  display: block;
  margin-top: 2px;
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.7;
}

.article-excerpt {
  display: -webkit-box;
  max-width: 38em;
  margin: 8px 0 0;
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.95;
  letter-spacing: 0.03em;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-faint);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.tag {
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.1em;
}

.article-arrow {
  font-family: var(--latin);
  font-size: 13px;
  opacity: 0.45;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.article-link:hover .article-arrow,
.article-link:focus-visible .article-arrow {
  opacity: 0.9;
  transform: translateX(4px);
}

.empty-state {
  padding: 60px 0;
  color: var(--ink-faint);
  text-align: center;
  letter-spacing: 0.1em;
}

/* ---------- 文章页 ---------- */

.article-paper {
  padding-top: clamp(18px, 3vw, 30px);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 40px);
  color: var(--ink-soft);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: color 0.2s ease, gap 0.2s ease;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--ink);
  gap: 12px;
  outline: none;
}

.article-header {
  padding-bottom: clamp(22px, 3vw, 32px);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.article-header .eyebrow {
  margin-bottom: 18px;
}

.article-header h1 {
  margin: 0 auto;
  max-width: 18em;
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  font-weight: 500;
  letter-spacing: 0.16em;
  line-height: 1.35;
}

.article-header .lede {
  margin: 10px auto 0;
  max-width: 26em;
  color: var(--accent);
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  letter-spacing: 0.1em;
  line-height: 1.8;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 16px;
  margin-top: clamp(18px, 2.6vw, 26px);
  color: var(--ink-faint);
  font-size: 11.5px;
  letter-spacing: 0.14em;
}

.article-meta-row .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
}

/* 正文 */

.prose {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 56px) 0 clamp(10px, 2vw, 18px);
  font-size: clamp(1.02rem, 1.24vw, 1.1rem);
  line-height: 2.15;
  letter-spacing: 0.045em;
  text-align: justify;
  text-justify: inter-ideograph;
}

.prose > * + * {
  margin-top: 1.55em;
}

.prose p {
  margin: 0;
  text-indent: 2em;
}

/* 每节第一个段落（正文开头或紧跟小标题之后）不缩进 */
.prose > p:first-of-type,
.prose > h2 + p,
.prose > h3 + p {
  text-indent: 0;
}

.prose h2,
.prose h3 {
  margin-top: 2.2em;
  margin-bottom: 0.9em;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.6;
  text-align: left;
}

.prose h2:first-child {
  margin-top: 0;
}

/* 小标题带一条短横线，作为章节分隔 */
.prose h2::after {
  display: block;
  width: 1.6em;
  height: 1px;
  margin-top: 0.55em;
  background: var(--line-strong);
  content: "";
}

.prose h2 {
  font-size: 1.25em;
}

.prose h3 {
  font-size: 1.1em;
  color: var(--ink-soft);
}

.prose blockquote {
  margin: 2em 0;
  padding: 0.2em 0 0.2em 1.4em;
  border-left: 2px solid rgba(154, 116, 61, 0.45);
  color: var(--ink-soft);
  font-size: 0.98em;
}

.prose blockquote p {
  text-indent: 0;
}

.prose em {
  color: var(--ink-soft);
}

.prose hr {
  width: 4em;
  margin: 2.6em auto;
  border: 0;
  border-top: 1px solid var(--line-strong);
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

/* 文末 */

.article-end {
  display: grid;
  place-items: center;
  gap: 12px;
  padding: clamp(18px, 3vw, 28px) 0 clamp(6px, 1.6vw, 12px);
}

.article-end-mark {
  width: 3.4em;
  height: 1px;
  background: var(--line-strong);
}

.article-end p {
  margin: 0;
  color: var(--ink-faint);
  font-size: 11.5px;
  letter-spacing: 0.2em;
}

.article-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 20px);
  margin-top: clamp(18px, 3vw, 28px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.article-nav a {
  display: grid;
  gap: 4px;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2vw, 22px);
  border: 1px solid var(--line);
  border-radius: 2px;
  text-decoration: none;
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.25s ease;
}

.article-nav a:hover,
.article-nav a:focus-visible {
  border-color: var(--line-strong);
  background-color: rgba(255, 253, 247, 0.6);
  outline: none;
  transform: translateY(-2px);
}

.article-nav .nav-label {
  color: var(--ink-faint);
  font-family: var(--latin);
  font-size: 10.5px;
  font-style: italic;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.article-nav .nav-title {
  font-size: 15px;
  letter-spacing: 0.08em;
  line-height: 1.6;
}

.article-nav .next {
  text-align: right;
}

.article-nav .back-all {
  grid-column: 1 / -1;
  justify-items: center;
  text-align: center;
  border-style: dashed;
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: auto;
  padding-top: clamp(26px, 4vw, 42px);
  color: var(--ink-faint);
  font-size: 11.5px;
  line-height: 1.8;
  text-align: center;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.public-security-record {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}

.public-security-record img {
  width: 14px;
  height: 14px;
  object-fit: contain;
}

.separator {
  padding: 0 0.7em;
  opacity: 0.6;
}

/* ---------- 入场动效 ---------- */

.article-item {
  animation: rise 0.6s ease both;
  animation-delay: var(--delay, 0ms);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- 响应式 ---------- */

@media (max-width: 760px) {
  body {
    padding: 10px;
  }

  .paper {
    min-height: calc(100vh - 20px);
    padding: 20px 20px 24px;
  }

  .masthead {
    align-items: flex-start;
  }

  .masthead--minimal {
    padding-bottom: 10px;
  }

  .masthead-nav {
    width: 100%;
    justify-content: flex-end;
    gap: 10px;
    font-size: 12px;
  }

  .hero {
    padding: 30px 0 22px;
  }

  .hero h1 {
    letter-spacing: 0.16em;
  }

  .article-link {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 20px 6px;
  }

  .article-date {
    order: 2;
  }

  .article-main {
    order: 1;
  }

  .article-meta {
    order: 3;
  }

  .article-arrow {
    display: none;
  }

  .article-excerpt {
    -webkit-line-clamp: 3;
  }

  .prose {
    font-size: 1rem;
    line-height: 2.05;
    letter-spacing: 0.02em;
  }

  .article-nav {
    grid-template-columns: 1fr;
  }

  .article-nav .next {
    text-align: left;
  }
}