@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;500;600;700&family=Libre+Baskerville:wght@400;700&display=swap');

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

:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-ink: #000000;
  --c-gray-100: #f5f5f5;
  --c-gray-200: #e8e8e8;
  --c-gray-400: #999999;
  --c-gray-600: #555555;
  --c-border: #222222;
  --font-serif: 'Cormorant Garamond', 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-sans: system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --max-w: 1200px;
  --gutter: 2rem;
  --header-h: 60px;
  --topbar-h: 36px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  background: var(--c-white);
  color: var(--c-black);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 0.75rem 0 1.5rem;
}

.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── 顶部公告条 ── */
.top-bar {
  background: var(--c-black);
  color: var(--c-white);
  text-align: center;
  padding: 0.5rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── 顶部 header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--c-white);
  border-bottom: 1px solid var(--c-border);
  height: var(--header-h);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--c-black);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 70%;
}

/* ── 汉堡按钮 ── */
.hamburger {
  background: none;
  border: 1px solid var(--c-black);
  cursor: pointer;
  width: 44px;
  height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--c-black);
  transition: transform 220ms ease, opacity 220ms ease;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.hamburger.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ── 全屏遮罩菜单 ── */
.fullscreen-menu {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--c-black);
  color: var(--c-white);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 4rem var(--gutter);
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.fullscreen-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.menu-close {
  position: absolute;
  top: calc(var(--topbar-h) + 0.75rem);
  right: var(--gutter);
  background: none;
  border: 1px solid var(--c-white);
  color: var(--c-white);
  font-size: 1.2rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.nav-link {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--c-white);
  letter-spacing: 0.02em;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.2rem;
  transition: border-color 220ms ease;
}

.nav-link:hover {
  border-color: var(--c-white);
}

/* ── 粘性锚点条 ── */
.anchor-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 100;
  background: var(--c-white);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.anchor-bar::-webkit-scrollbar {
  display: none;
}

.anchor-link {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  padding: 0.7rem 1.2rem;
  white-space: nowrap;
  border-right: 1px solid var(--c-border);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background 220ms ease;
}

.anchor-link:hover {
  background: var(--c-black);
  color: var(--c-white);
}

/* ── main 布局：内容 + aside ── */
main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gutter);
  align-items: start;
}

article {
  min-width: 0;
}

/* ── aside ── */
.site-aside {
  position: sticky;
  top: calc(var(--header-h) + 1rem);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 2rem;
}

.aside-block {
  border: 1px solid var(--c-border);
  padding: 1.25rem;
}

.aside-heading {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.aside-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.aside-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--c-gray-600);
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--c-gray-200);
  transition: color 220ms ease;
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-link:hover,
.aside-link.is-active {
  color: var(--c-black);
  font-weight: 700;
}

.aside-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

/* ── div 通用 ── */
.section-inner {
  padding: 2rem 0;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}

/* ── Hero 首页 ── */
.hero-section {
  min-height: 70vh;
  display: flex;
  align-items: flex-end;
  border-bottom: 2px solid var(--c-black);
  padding-bottom: 0;
}

.hero-section .section-inner {
  padding: 4rem 0 3rem;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  font-weight: 700;
  border: 1px solid var(--c-black);
  padding: 0.2rem 0.6rem;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
  max-width: 18ch;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--c-gray-600);
  max-width: 55ch;
  line-height: 1.7;
}

/* ── 内页 hero ── */
.page-hero-section .section-inner {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 0;
}

.page-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  margin-top: 1rem;
}

.page-desc {
  font-size: 1rem;
  color: var(--c-gray-600);
  max-width: 60ch;
  line-height: 1.7;
  margin-top: 0.75rem;
}

/* ── entry ── */
.entry-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  margin-top: 1rem;
  margin-bottom: 0.75rem;
}

.entry-dates {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.entry-date {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--c-gray-400);
  letter-spacing: 0.04em;
}

.entry-hero-img {
  margin-top: 1.5rem;
}

.entry-hero-img .hero-img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

/* ── prose ── */
.prose-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--c-black);
}

.prose-content h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 0.4rem;
}

.prose-content h2 + hr {
  margin: 0.4rem 0 1rem;
}

.prose-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.5rem 0 0.3rem;
}

.prose-content h3 + hr {
  margin: 0.3rem 0 0.8rem;
}

.prose-content p {
  margin-bottom: 1.2rem;
}

.prose-content ul,
.prose-content ol {
  margin: 0.8rem 0 1.2rem 1.4rem;
}

.prose-content li {
  margin-bottom: 0.4rem;
}

.prose-content a {
  border-bottom: 1px solid var(--c-black);
  transition: opacity 220ms ease;
}

.prose-content a:hover {
  opacity: 0.6;
}

/* ── 分类卡片网格（子页列表） ── */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
  margin-top: 0.5rem;
}

.cat-block {
  background: var(--c-white);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem;
  transition: background 220ms ease, color 220ms ease;
  min-height: 110px;
}

.cat-block:hover {
  background: var(--c-black);
  color: var(--c-white);
}

.cat-block strong {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
}

.cat-desc {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--c-gray-600);
  line-height: 1.5;
}

.cat-block:hover .cat-desc {
  color: var(--c-gray-200);
}

/* ── 条目列表 ── */
.entry-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--c-border);
}

.entry-item {
  border-bottom: 1px solid var(--c-border);
}

.entry-link {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  transition: background 220ms ease;
}

.entry-link:hover {
  padding-left: 0.5rem;
}

.entry-num {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--c-gray-400);
  letter-spacing: 0.08em;
  flex-shrink: 0;
  min-width: 2rem;
  padding-top: 0.2rem;
}

.entry-info {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.entry-info strong {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
}

.entry-meta {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--c-gray-400);
}

/* ── 子页网格（children grid / tag grid） ── */
.children-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 0.5rem;
}

/* ── 玻璃拟态卡片（高对比黑白版） ── */
.glass-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--c-border);
  backdrop-filter: blur(0px);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.4rem;
  transition: background 220ms ease, border-color 220ms ease, transform 220ms ease;
}

.glass-card:hover {
  background: var(--c-black);
  color: var(--c-white);
  transform: translateY(-2px);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.card-desc {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--c-gray-600);
  line-height: 1.5;
}

.glass-card:hover .card-desc {
  color: var(--c-gray-200);
}

.card-meta {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--c-gray-400);
  margin-top: auto;
}

.glass-card:hover .card-meta {
  color: var(--c-gray-200);
}

/* ── sibling links ── */
.siblings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 0.5rem;
}

.sibling-link {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem;
  border: 1px solid var(--c-border);
  transition: background 220ms ease;
}

.sibling-link:hover {
  background: var(--c-black);
  color: var(--c-white);
}

.sibling-link strong {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
}

.sibling-link span {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--c-gray-600);
}

.sibling-link:hover span {
  color: var(--c-gray-200);
}

/* ── related list ── */
.related-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--c-border);
}

.related-link {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--c-border);
  transition: padding-left 220ms ease;
}

.related-link:hover {
  padding-left: 0.5rem;
}

.related-num {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--c-gray-400);
  flex-shrink: 0;
  min-width: 2rem;
  padding-top: 0.2rem;
}

.related-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.related-info strong {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
}

.related-meta {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--c-gray-400);
}

/* ── tag pills ── */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.tag-pill {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  border: 1px solid var(--c-border);
  padding: 0.3rem 0.75rem;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  transition: background 220ms ease, color 220ms ease;
}

.tag-pill:hover,
.tag-pill.is-active {
  background: var(--c-black);
  color: var(--c-white);
}

/* ── breadcrumb ── */
.breadcrumb {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--c-gray-400);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--c-gray-600);
  transition: color 220ms ease;
}

.breadcrumb a:hover {
  color: var(--c-black);
}

/* ── footer ── */
.site-footer {
  border-top: 2px solid var(--c-black);
  margin-top: 4rem;
}

.footer-top {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem var(--gutter);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.footer-address {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.8;
  font-style: normal;
  color: var(--c-gray-600);
}

.footer-address strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--c-black);
  margin-bottom: 0.4rem;
}

.footer-dl {
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

.footer-dl dt {
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  color: var(--c-black);
}

.footer-dl dd {
  margin: 0 0 0.4rem 0;
}

.footer-dl dd a {
  color: var(--c-gray-600);
  transition: color 220ms ease;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

.footer-dl dd a:hover {
  color: var(--c-black);
}

.footer-ul {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}

.footer-ul li a {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--c-gray-600);
  transition: color 220ms ease;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

.footer-ul li a:hover {
  color: var(--c-black);
}

.footer-bottom {
  border-top: 1px solid var(--c-border);
  text-align: center;
  padding: 1.25rem var(--gutter);
}

.footer-bottom p {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--c-gray-400);
  letter-spacing: 0.04em;
}

/* ── stagger animation ── */
@media (prefers-reduced-motion: no-preference) {
  .stagger-item {
    opacity: 0;
    transform: translateY(16px);
    animation: staggerIn 380ms ease forwards;
    animation-delay: calc(var(--i, 0) * 80ms + 100ms);
  }

  @keyframes staggerIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .stagger-item {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* ── 响应式 ── */
@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .site-aside {
    position: static;
    padding-top: 0;
    border-top: 1px solid var(--c-border);
    margin-top: 2rem;
    padding-bottom: 2rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem var(--gutter);
  }
}

@media (max-width: 600px) {
  :root {
    --gutter: 1rem;
  }

  .hero-section {
    min-height: 70vh;
  }

  .children-grid {
    grid-template-columns: 1fr;
  }

  .cat-grid {
    grid-template-columns: 1fr;
  }

  .siblings-grid {
    grid-template-columns: 1fr;
  }

  .brand-logo {
    font-size: 0.9rem;
  }

  .anchor-bar {
    top: var(--header-h);
  }

  .footer-ul {
    display: none;
  }
}