/* ========================================
   site.css — 全站共享样式
   轻量级，无框架依赖
   字体：DM Sans、Playfair Display 自托管（latin + latin-ext，SIL OFL）
======================================== */

@import url('fonts-self-hosted.css');

:root {
  --ink: #1a1a1a;
  --ink-2: #444;
  --ink-3: #888;
  --bg: #fafaf8;
  --bg-2: #f2f1ee;
  --bg-3: #e8e6e0;
  --accent: #c0392b;
  --accent-2: #e74c3c;
  --accent-soft: rgba(192, 57, 43, 0.12);
  --gold: #c8a96e;
  --line: #dddbd4;
  --serif: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --sans: 'DM Sans', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --mono: 'DM Mono', 'SF Mono', 'Fira Code', 'Courier New', monospace;
  /* 横向黄金分割：正文宽 ≈ 视口 × φ/(1+φ) ≈ 61.8%，两侧留白对称共分其余 */
  --phi: 1.6180339887;
  --phi-inv: 0.6180339887;
  --layout-gutter: max(1rem, min(3.2vw, 2.75rem));
  --layout-content-ideal: calc(100vw * var(--phi-inv));
  --layout-content-floor: calc(100vw - 2 * var(--layout-gutter));
  --max-w-article: 960px;
  --max-w-wide-hub: 1220px;
  --max-w: var(--max-w-article);
  --max-w-wide: var(--max-w-wide-hub);
  --r: 6px;
  --article-radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e6df;
    --ink-2: #b8b5ac;
    --ink-3: #777;
    --bg: #171614;
    --bg-2: #1f1e1b;
    --bg-3: #2a2925;
    --accent: #e05245;
    --accent-2: #f06b5c;
    --accent-soft: rgba(224, 82, 69, 0.15);
    --gold: #d4b87a;
    --line: #2e2d29;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ── Page layout（内容区与两侧留白满足黄金占比，自适应 + 最大宽度封顶） ── */
.page-wrap {
  --golden-inner: min(
    var(--max-w-article),
    max(var(--layout-content-ideal), var(--layout-content-floor))
  );
  width: var(--golden-inner);
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding: 2.5rem var(--layout-gutter) 4rem;
  flex: 1;
  box-sizing: border-box;
}

.page-wrap.wide {
  --golden-inner: min(
    var(--max-w-wide-hub),
    max(var(--layout-content-ideal), var(--layout-content-floor))
  );
  width: var(--golden-inner);
  max-width: 100%;
}

.page-wrap.article-page {
  /* 与 .page-wrap 共用同一套黄金宽度 */
}

/* ── Breadcrumb（内页：弱化顶栏感，让位给大标题） ── */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: clamp(1.25rem, 2vw, 2rem);
}

.breadcrumb a {
  color: var(--ink-3);
  text-decoration: none;
  transition: color 0.15s;
}

.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span.sep { opacity: 0.35; font-weight: 400; letter-spacing: 0; }
.breadcrumb span.current { color: var(--ink-2); text-transform: none; letter-spacing: 0.01em; font-size: 0.8rem; }

.article-page .breadcrumb span.current:last-of-type {
  color: var(--ink-3);
  font-weight: 500;
}

/* ── Article：杂志感头区 + 统一入账宽度 ── */
.article-entry {
  position: relative;
}

.article-hero,
.article-header {
  margin-bottom: clamp(2rem, 3.5vw, 3rem);
  padding: clamp(1.25rem, 2.2vw, 1.85rem) clamp(1.1rem, 3vw, 2rem);
  padding-left: clamp(1.25rem, 3vw, 2rem);
  border-radius: var(--article-radius);
  background:
    linear-gradient(145deg, rgba(250, 250, 248, 0.98) 0%, rgba(242, 241, 238, 0.55) 48%, rgba(250, 250, 248, 0.2) 100%),
    var(--bg);
  border: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, 0 18px 48px rgba(10, 10, 10, 0.045);
  position: relative;
  overflow: hidden;
}

.article-hero::before,
.article-header::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--gold) 100%);
  border-radius: var(--article-radius) 0 0 var(--article-radius);
  opacity: 0.92;
}

.article-hero::after,
.article-header::after {
  content: '';
  position: absolute;
  right: -18%;
  top: -40%;
  width: clamp(220px, 38vw, 420px);
  aspect-ratio: 1 / var(--phi);
  background: radial-gradient(ellipse at center, var(--accent-soft) 0%, transparent 68%);
  pointer-events: none;
}

.article-title {
  font-family: var(--serif);
  font-size: clamp(1.85rem, 1.2rem + 2.8vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
  font-weight: 600;
  font-style: normal;
  color: var(--ink);
  margin: 0 0 clamp(1rem, 1.5vw, 1.35rem);
  max-width: min(36ch, 100%);
  text-wrap: balance;
  position: relative;
  z-index: 1;
}

.article-dek {
  font-family: var(--sans);
  font-size: clamp(1rem, 0.92rem + 0.35vw, 1.125rem);
  line-height: 1.65;
  color: var(--ink-2);
  font-weight: 400;
  margin: 0 0 clamp(0.65rem, 1vw, 0.85rem);
  max-width: 36ch;
  position: relative;
  z-index: 1;
}

.article-byline {
  font-family: var(--sans);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--ink-3);
  margin: 0 0 clamp(0.85rem, 1.2vw, 1.05rem);
  position: relative;
  z-index: 1;
}

.article-byline a {
  color: var(--ink-2);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.article-byline a:hover {
  color: var(--accent);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-3);
  position: relative;
  z-index: 1;
}

.article-meta time {
  font-feature-settings: 'tnum' 1;
  letter-spacing: 0.02em;
}

.article-meta .meta-sep {
  opacity: 0.35;
  user-select: none;
  font-weight: 400;
}

.article-meta .tag {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: border-color 0.15s, color 0.15s, box-shadow 0.15s;
}

.article-meta .tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ── 文末版权声明（可见文案；浅色纹理便于截图溯源，不阻拦正文复制） ── */
.article-copyright {
  margin-top: clamp(2rem, 3.8vw, 2.75rem);
  padding: clamp(1.15rem, 2vw, 1.65rem) clamp(1rem, 2.5vw, 1.5rem);
  border-radius: var(--article-radius);
  border: 1px solid var(--line);
  background-color: rgba(252, 251, 248, 0.92);
  background-image:
    repeating-linear-gradient(
      -26deg,
      transparent,
      transparent 34px,
      rgba(160, 155, 145, 0.06) 34px,
      rgba(160, 155, 145, 0.06) 35px
    );
  font-family: var(--sans);
  font-size: 0.8125rem;
  line-height: 1.72;
  color: var(--ink-3);
  position: relative;
}

.article-copyright-lead {
  margin: 0 0 0.65rem;
  font-size: 0.875rem;
  color: var(--ink-2);
}

.article-copyright p {
  margin: 0 0 0.65rem;
}

.article-copyright-list {
  margin: 0 0 0.85rem 1.15rem;
  padding: 0;
}

.article-copyright-list li {
  margin-bottom: 0.35rem;
}

.article-copyright-canonical {
  word-break: break-all;
}

.article-copyright-canonical a {
  color: var(--ink-2);
  font-weight: 500;
}

.article-copyright-canonical a:hover {
  color: var(--accent);
}

.article-copyright-more {
  margin-bottom: 0 !important;
}

.article-copyright-more a {
  color: var(--accent);
  font-weight: 600;
  text-underline-offset: 0.15em;
}

.article-copyright-more a:hover {
  color: var(--gold);
}

/* 独立版权声明页正文（blog/copyright.html） */
.copyright-policy-page .copyright-policy-inner {
  max-width: min(52rem, 100%);
}

.copyright-policy-page .copyright-policy-inner h2 {
  font-family: var(--sans);
  font-size: clamp(1.05rem, 0.95rem + 0.35vw, 1.2rem);
  margin: 1.75rem 0 0.65rem;
  color: var(--ink);
}

.copyright-policy-page .copyright-policy-inner h2:first-child {
  margin-top: 0;
}

.copyright-policy-page .copyright-policy-inner p,
.copyright-policy-page .copyright-policy-inner li {
  font-family: var(--sans);
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-2);
}

.copyright-policy-page .copyright-policy-inner ul {
  margin: 0.5rem 0 1rem 1.15rem;
  padding: 0;
}

/* ── Article body（正文层级：通顺长文） ── */
.article-body {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.article-body > p:first-of-type {
  font-family: var(--sans);
  font-size: clamp(1.05rem, 0.95rem + 0.45vw, 1.2rem);
  line-height: 1.72;
  color: var(--ink-2);
  font-weight: 500;
}

.article-body h2 {
  font-family: var(--sans);
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.45rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: clamp(2.2rem, 4vw, 2.85rem) 0 0.85rem;
  padding-bottom: 0.55rem;
  border-bottom: none;
  position: relative;
}

.article-body h2::after {
  content: '';
  display: block;
  margin-top: 0.65rem;
  width: calc(1rem * var(--phi));
  height: 2px;
  background: linear-gradient(90deg, var(--accent), rgba(200, 169, 110, 0.55));
  border-radius: 1px;
}

.article-body h3 {
  font-family: var(--sans);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  margin: 1.75rem 0 0.5rem;
}

.article-body p, .article-body strong { 
  margin-bottom: 1.2rem; 
}

.article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(192,57,43,.3);
  text-underline-offset: 3px;
}

.article-body a:hover { text-decoration-color: var(--accent); }

.article-body ul, .article-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

.article-body li { margin-bottom: .4rem; }

.article-body blockquote {
  border-left: none;
  padding: 1.15rem 1.35rem 1.15rem 2rem;
  margin: clamp(1.5rem, 3vw, 2rem) 0;
  background: linear-gradient(90deg, var(--accent-soft) 0%, var(--bg-2) 38%, var(--bg-2) 100%);
  border-radius: 0 var(--r) var(--r) 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--ink-2);
  position: relative;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset;
}

.article-body blockquote::before {
  content: '“';
  font-family: var(--serif);
  font-size: 2.5rem;
  line-height: 0;
  color: var(--accent);
  opacity: 0.35;
  position: absolute;
  left: 0.65rem;
  top: 1.15rem;
}

.article-body code {
  font-family: var(--mono);
  font-size: .85em;
  background: var(--bg-2);
  padding: .1em .35em;
  border-radius: 3px;
}

.article-body pre {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin-bottom: 1.2rem;
}

.article-body pre code {
  background: none;
  padding: 0;
  font-size: .88rem;
}

.article-body img {
  max-width: 100%;
  border-radius: var(--r);
  margin: 1.2rem 0;
  border: 1px solid var(--line);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.2rem;
  font-size: .9rem;
}

.article-body th, .article-body td {
  padding: .55rem .9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.article-body th { background: var(--bg-2); font-weight: 600; }

/* ── 智库列表（纵向列表排版） ── */
.blog-hub__article-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  border-radius: calc(var(--r) + 2px);
  /* border: 1px solid var(--line); */
  background: var(--bg);
  overflow: hidden;
}

.blog-hub__article-list--pinned {
  margin-top: 0.85rem;
}

.blog-list-item {
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.blog-list-item:last-child {
  border-bottom: none;
}

.blog-list-item__link {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.65rem 1.15rem;
  padding: clamp(0.95rem, 2vw, 1.2rem) clamp(1rem, 2vw, 1.25rem);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s ease;
}

.blog-list-item__link:hover {
  background: rgba(242, 241, 238, 0.55);
}

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

.blog-list-item__date {
  flex: 0 0 auto;
  min-width: 5.75rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-3);
  font-feature-settings: 'tnum' 1;
  padding-top: 0.22rem;
}

.blog-list-item__text {
  flex: 1 1 min(100%, 12rem);
  min-width: 0;
}

.blog-list-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem 0.85rem;
}

.blog-list-item__cat {
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

.blog-list-item__title {
  font-family: var(--serif);
  font-size: clamp(1.02rem, 0.95rem + 0.25vw, 1.15rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.35;
}

.blog-list-item__link:hover .blog-list-item__title {
  color: var(--accent);
}

.blog-list-item__dek {
  margin: 0.4rem 0 0;
  font-family: var(--sans);
  font-size: 0.865rem;
  color: var(--ink-3);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.blog-list-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.55rem;
}

.blog-list-item__tag {
  font-size: 0.68rem;
  color: var(--ink-3);
  background: var(--bg-2);
  padding: 0.12rem 0.42rem;
  border-radius: 4px;
}

.blog-hub__empty {
  margin-top: 0.85rem;
  font-size: 0.88rem;
  color: var(--ink-3);
  line-height: 1.6;
}

.blog-hub__empty code {
  font-size: 0.82rem;
}

@media (min-width: 720px) {
  .blog-list-item__link {
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 1rem 1.35rem;
  }

  .blog-list-item__date {
    border-right: 1px solid var(--line);
    padding-right: 1.15rem;
    margin-right: 0;
    align-self: stretch;
    padding-top: 0.35rem;
  }
}

/* ── 智库 hub：首屏 ── */
.blog-hub__hero {
  position: relative;
  margin-bottom: clamp(2.25rem, 4vw, 3.5rem);
  padding: clamp(1.75rem, 3vw, 2.75rem) clamp(1.25rem, 3vw, 2.5rem);
  border-radius: calc(var(--article-radius) + 2px);
  border: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(242, 241, 238, 0.65) 0%, rgba(250, 250, 248, 0.92) 42%, rgba(255, 255, 255, 0.35) 100%),
    var(--bg);
  box-shadow: 0 20px 56px rgba(10, 10, 10, 0.055);
  overflow: hidden;
}

.blog-hub__hero::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--gold));
  border-radius: inherit;
}

.blog-hub__hero::after {
  content: '';
  position: absolute;
  right: -15%;
  bottom: -35%;
  width: min(52vw, 520px);
  aspect-ratio: var(--phi);
  background: radial-gradient(ellipse at 40% 40%, var(--accent-soft), transparent 62%);
  pointer-events: none;
}

.blog-hub__kicker {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.65rem;
  position: relative;
  z-index: 1;
}

.blog-hub__title {
  font-family: var(--serif);
  font-size: clamp(2rem, 1.2rem + 3.5vw, 3.35rem);
  font-weight: 600;
  letter-spacing: -0.038em;
  line-height: 1.1;
  color: var(--ink);
  margin: 0 0 0.85rem;
  max-width: 18ch;
  text-wrap: balance;
  position: relative;
  z-index: 1;
}

.blog-hub__title-brand {
  margin-right: 0.35rem;
  font-style: normal;
}

.blog-hub__lede {
  font-family: var(--sans);
  font-size: clamp(0.98rem, 0.9rem + 0.35vw, 1.15rem);
  line-height: 1.65;
  color: var(--ink-2);
  max-width: 42ch;
  margin: 0 0 1rem;
  position: relative;
  z-index: 1;
}

.blog-hub__stats {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink-3);
  position: relative;
  z-index: 1;
}

.blog-hub__stats-num {
  font-family: var(--serif);
  font-size: 1.15em;
  font-weight: 600;
  color: var(--ink);
  margin-right: 0.15rem;
}

.blog-hub__section {
  margin-bottom: clamp(2rem, 3vw, 2.75rem);
}

.blog-hub__featured {
  margin-bottom: 2rem;
}

@media (prefers-reduced-motion: reduce) {
  .blog-list-item__link {
    transition: none;
  }
}

/* ── Section heading（区块标签：与优质博客分区一致） ── */
.section-h {
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.25rem;
  padding-bottom: 0;
  border-bottom: none;
}

.section-h::after {
  content: '';
  display: block;
  width: calc(1rem * var(--phi));
  height: 2px;
  margin-top: 0.65rem;
  background: linear-gradient(90deg, var(--accent), rgba(200, 169, 110, 0.6));
  border-radius: 1px;
}

/* ── Related posts ── */
.related {
  margin-top: clamp(3rem, 5vw, 4rem);
  padding-top: clamp(2rem, 3vw, 2.75rem);
  border-top: 1px solid var(--line);
}

.related .section-h {
  margin-bottom: 1rem;
}

.related-list {
  list-style: none;
  margin-top: 0.5rem;
}

.related-list li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  transition: background 0.15s;
  margin: 0 -0.35rem;
  padding-left: 0.35rem;
  padding-right: 0.35rem;
  border-radius: var(--r);
}

.related-list li:hover {
  background: rgba(242, 241, 238, 0.55);
}

.related-list a {
  font-family: var(--serif);
  color: var(--ink);
  text-decoration: none;
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  flex: 1 1 200px;
}

.related-list a:hover { color: var(--accent); }

.related-list .r-date {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-3);
  font-feature-settings: 'tnum' 1;
}

/* ── Mobile ── */
@media (max-width: 640px) {
  .article-hero,
  .article-header {
    padding: 1.15rem 1.1rem 1.15rem 1.25rem;
  }
  .article-title {
    max-width: 100%;
  }
  .breadcrumb {
    letter-spacing: 0.04em;
  }
  .header-inner { padding: 0 1rem; gap: 1rem; }
  .page-wrap {
    padding: 1.5rem max(1rem, var(--layout-gutter)) 3rem;
  }
  .blog-hub__hero {
    padding: 1.35rem 1.15rem;
  }
}