/* ============================================
   Christie's Inspired Hexo Theme
   Design tokens from christies.com:
   - Luxurious minimalism, gallery aesthetic
   - High contrast black/white palette
   - Serif branding + Sans-serif UI
   - Generous whitespace & negative space
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-black: #000000;
  --color-near-black: #1a1a1a;
  --color-dark-gray: #333333;
  --color-mid-gray: #666666;
  --color-light-gray: #999999;
  --color-border: #e0e0e0;
  --color-bg-light: #f7f7f7;
  --color-bg-warm: #f5f3f0;
  --color-white: #ffffff;
  --color-accent: #8b7355;

  --font-serif: 'Playfair Display', 'Noto Serif SC', 'Georgia', 'Times New Roman', serif;
  --font-sans: 'Noto Sans SC', 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-ui: 'Inter', 'Noto Sans SC', 'PingFang SC', sans-serif;

  --max-width: 1200px;
  --content-width: 780px;
  --header-height: 72px;

  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  line-height: 1.8;
  letter-spacing: 0.01em;
}

a {
  color: var(--color-near-black);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

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

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

::selection {
  background: var(--color-near-black);
  color: var(--color-white);
}

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-black);
}

.brand-logo:hover {
  color: var(--color-black);
  opacity: 0.8;
}

.header-nav {
  display: flex;
  gap: 36px;
}

.nav-link {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-dark-gray);
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-black);
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-black);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-black);
  transition: var(--transition);
}

/* --- Main Content Offset --- */
.main-content {
  margin-top: var(--header-height);
}

/* --- Hero Section (Index Page) --- */
.hero-section {
  background: var(--color-near-black);
  color: var(--color-white);
  padding: 100px 40px 90px;
  text-align: center;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-tagline {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.02em;
}

/* --- Posts Section --- */
.posts-section {
  padding: 80px 40px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
  margin-bottom: 56px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

/* --- Post Cards Grid --- */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.post-card {
  background: var(--color-white);
  padding: 40px;
  transition: background var(--transition);
}

.post-card:hover {
  background: var(--color-bg-light);
}

.post-card--featured {
  grid-column: 1 / -1;
  padding: 56px 40px;
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.post-card__meta time {
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--color-light-gray);
  letter-spacing: 0.05em;
}

.post-card__category {
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.post-card__title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 12px;
  letter-spacing: 0.01em;
  position: relative;
  z-index: 1;
}

.post-card--featured .post-card__title {
  font-size: 32px;
}

.post-card__title a {
  color: var(--color-near-black);
}

.post-card__title a:hover {
  color: var(--color-accent);
}

.post-card__excerpt {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-mid-gray);
  margin-bottom: 20px;
}

.post-card__link {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-near-black);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--color-near-black);
  transition: all var(--transition);
  position: relative;
  z-index: 2;
}

.post-card__link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* --- Article (Single Post) --- */
.article-header {
  background: var(--color-near-black);
  color: var(--color-white);
  padding: 80px 40px 72px;
  text-align: center;
}

.article-header__inner {
  max-width: var(--content-width);
  margin: 0 auto;
}

.article-header__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
  font-family: var(--font-ui);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.article-header__sep {
  color: rgba(255, 255, 255, 0.25);
}

.article-header__category {
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 12px;
}

.article-header__category:hover {
  color: rgba(255, 255, 255, 0.8);
}

.article-header__title {
  font-family: var(--font-serif);
  font-size: 40px;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

/* --- Article Body --- */
.article-body {
  padding: 64px 40px 80px;
}

.article-body__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  font-size: 16px;
  line-height: 2;
  color: var(--color-dark-gray);
}

.article-body__inner h1 {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 500;
  margin: 56px 0 24px;
  color: var(--color-near-black);
  letter-spacing: 0.01em;
  line-height: 1.4;
}

.article-body__inner h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 500;
  margin: 48px 0 20px;
  color: var(--color-near-black);
  letter-spacing: 0.01em;
  line-height: 1.4;
}

.article-body__inner h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  margin: 36px 0 16px;
  color: var(--color-near-black);
  line-height: 1.5;
}

.article-body__inner h4 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-near-black);
  letter-spacing: 0.02em;
}

.article-body__inner p {
  margin-bottom: 20px;
}

.article-body__inner a {
  color: var(--color-near-black);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.article-body__inner a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.article-body__inner blockquote {
  margin: 32px 0;
  padding: 24px 32px;
  border-left: 3px solid var(--color-near-black);
  background: var(--color-bg-warm);
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-mid-gray);
  font-size: 17px;
  line-height: 1.8;
}

.article-body__inner blockquote p:last-child {
  margin-bottom: 0;
}

.article-body__inner ul,
.article-body__inner ol {
  margin: 16px 0 20px;
  padding-left: 24px;
}

.article-body__inner li {
  margin-bottom: 8px;
}

.article-body__inner img {
  display: block;
  margin: 32px auto;
  border-radius: 2px;
}

.article-body__inner hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: 48px 0;
}

.article-body__inner > table,
.article-body__inner > *:not(figure) table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}

.article-body__inner > table th,
.article-body__inner > table td,
.article-body__inner > *:not(figure) table th,
.article-body__inner > *:not(figure) table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.article-body__inner > table th,
.article-body__inner > *:not(figure) table th {
  font-weight: 600;
  color: var(--color-near-black);
  border-bottom: 2px solid var(--color-near-black);
}

/* --- Code Blocks --- */
.article-body__inner code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
  background: var(--color-bg-warm);
  padding: 3px 7px;
  border-radius: 3px;
  color: #8b5d3b;
  border: 1px solid var(--color-border);
}

.article-body__inner pre {
  margin: 28px 0;
  padding: 0;
  background: var(--color-bg-warm);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  overflow-x: auto;
  line-height: 1.7;
}

.article-body__inner pre code {
  display: block;
  background: none;
  color: var(--color-dark-gray);
  padding: 24px 28px;
  font-size: 13.5px;
  border: none;
}

figure.highlight {
  margin: 28px 0;
  background: var(--color-bg-warm);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

figure.highlight pre {
  margin: 0;
  padding: 24px 28px;
  background: transparent;
  border: none;
}

figure.highlight table {
  margin: 0;
  border: none;
  width: 100%;
}

figure.highlight td {
  padding: 0;
  border: none;
}

figure.highlight .gutter {
  width: 52px;
  text-align: left;
  padding-left: 20px;
  padding-right: 12px;
  border-right: 1px solid var(--color-border);
  color: var(--color-light-gray);
  user-select: none;
  background: rgba(0, 0, 0, 0.02);
}

figure.highlight .gutter pre {
  padding: 24px 0;
  padding-left: 20px;
}

figure.highlight .code {
  padding-left: 20px;
}

figure.highlight .code pre {
  padding: 24px 0;
}

figure.highlight .line {
  line-height: 1.7;
}

/* Syntax highlighting — warm light theme */
.highlight .comment,
.highlight .quote { color: #998a7a; font-style: italic; }
.highlight .keyword,
.highlight .selector-tag { color: #7a3e9d; font-weight: 500; }
.highlight .string,
.highlight .addition { color: #5a7a3a; }
.highlight .number,
.highlight .literal { color: #b35e3a; }
.highlight .built_in,
.highlight .builtin-name { color: #2e6b9e; }
.highlight .function,
.highlight .title { color: #2e6b9e; }
.highlight .type,
.highlight .class .title { color: #8b6914; }
.highlight .attr,
.highlight .attribute { color: #8b6914; }
.highlight .symbol,
.highlight .bullet { color: #357a7a; }
.highlight .subst { color: var(--color-dark-gray); }
.highlight .meta { color: #6b5acd; }
.highlight .deletion { color: #c1392b; }
.highlight .regexp { color: #357a7a; }
.highlight .tag { color: #7a3e9d; }
.highlight .name { color: #c1392b; }
.highlight .selector-id,
.highlight .selector-class { color: #2e6b9e; }
.highlight .params { color: var(--color-mid-gray); }

/* --- Article Footer --- */
.article-footer {
  border-top: 1px solid var(--color-border);
}

.article-footer__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 40px;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.tag-item {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 6px 16px;
  border: 1px solid var(--color-border);
  color: var(--color-mid-gray);
  transition: all var(--transition);
}

.tag-item:hover {
  background: var(--color-near-black);
  border-color: var(--color-near-black);
  color: var(--color-white);
}

/* --- Article Navigation --- */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.article-nav__link {
  display: block;
  padding: 28px 24px;
  background: var(--color-white);
  transition: background var(--transition);
}

.article-nav__link:hover {
  background: var(--color-bg-light);
}

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

.article-nav__label {
  display: block;
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-light-gray);
  margin-bottom: 8px;
}

.article-nav__title {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--color-near-black);
  line-height: 1.5;
}

/* --- Archive Page --- */
.archive-page,
.taxonomy-page {
  min-height: 60vh;
}

.archive-header,
.taxonomy-header {
  background: var(--color-near-black);
  color: var(--color-white);
  padding: 72px 40px 64px;
  text-align: center;
}

.archive-header__inner,
.taxonomy-header__inner {
  max-width: var(--content-width);
  margin: 0 auto;
}

.archive-header__title,
.taxonomy-header__title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.archive-header__count,
.taxonomy-header__count {
  font-family: var(--font-ui);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  letter-spacing: 0.05em;
}

.archive-content,
.taxonomy-content {
  padding: 64px 40px 80px;
}

.archive-content__inner,
.taxonomy-content__inner {
  max-width: var(--content-width);
  margin: 0 auto;
}

.archive-year {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 400;
  color: var(--color-near-black);
  margin: 48px 0 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.04em;
}

.archive-year:first-child {
  margin-top: 0;
}

.archive-item {
  display: flex;
  align-items: baseline;
  gap: 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-bg-light);
  transition: background var(--transition);
}

.archive-item:hover {
  background: var(--color-bg-light);
  padding-left: 12px;
  padding-right: 12px;
  margin-left: -12px;
  margin-right: -12px;
}

.archive-item__date {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--color-light-gray);
  flex-shrink: 0;
  min-width: 70px;
  letter-spacing: 0.02em;
}

.archive-item__title {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--color-near-black);
  line-height: 1.5;
}

.archive-item__title:hover {
  color: var(--color-accent);
}

/* --- Tag Cloud --- */
.tag-cloud,
.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-cloud__item,
.category-list__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui);
  font-size: 13px;
  padding: 10px 20px;
  border: 1px solid var(--color-border);
  color: var(--color-mid-gray);
  transition: all var(--transition);
  letter-spacing: 0.03em;
}

.tag-cloud__item:hover,
.category-list__item:hover {
  background: var(--color-near-black);
  border-color: var(--color-near-black);
  color: var(--color-white);
}

.tag-cloud__count,
.category-list__count {
  font-size: 11px;
  color: var(--color-light-gray);
}

.tag-cloud__item:hover .tag-cloud__count,
.category-list__item:hover .category-list__count {
  color: rgba(255, 255, 255, 0.5);
}

/* --- Pagination --- */
.pagination {
  padding: 48px 40px;
  border-top: 1px solid var(--color-border);
}

.pagination__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.pagination__link {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-near-black);
  padding: 10px 24px;
  border: 1px solid var(--color-near-black);
  transition: all var(--transition);
}

.pagination__link:hover {
  background: var(--color-near-black);
  color: var(--color-white);
}

.pagination__link--disabled {
  color: var(--color-light-gray);
  border-color: var(--color-border);
  cursor: default;
  pointer-events: none;
}

.pagination__info {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--color-light-gray);
  letter-spacing: 0.05em;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-near-black);
  color: rgba(255, 255, 255, 0.4);
  padding: 48px 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand a {
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

.footer-brand a:hover {
  color: rgba(255, 255, 255, 0.9);
}

.footer-meta {
  text-align: right;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.03em;
  line-height: 1.8;
}

.footer-powered {
  margin-top: 4px;
  font-size: 11px;
  color: rgba(255, 255, 255, 0.25);
}

.footer-powered a {
  color: rgba(255, 255, 255, 0.35);
}

.footer-powered a:hover {
  color: rgba(255, 255, 255, 0.7);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 20px;
  }

  .header-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .header-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-link {
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-bg-light);
  }

  .nav-link::after {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-section {
    padding: 60px 20px 56px;
  }

  .hero-title {
    font-size: 32px;
  }

  .posts-section {
    padding: 48px 20px;
  }

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

  .post-card {
    padding: 28px 20px;
  }

  .post-card--featured {
    padding: 32px 20px;
  }

  .post-card__title {
    font-size: 20px;
  }

  .post-card--featured .post-card__title {
    font-size: 24px;
  }

  .article-header {
    padding: 56px 20px 48px;
  }

  .article-header__title {
    font-size: 28px;
  }

  .article-body {
    padding: 40px 20px 56px;
  }

  .article-body__inner h1 { font-size: 26px; }
  .article-body__inner h2 { font-size: 22px; }
  .article-body__inner h3 { font-size: 18px; }

  .article-footer__inner {
    padding: 28px 20px;
  }

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

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

  .archive-header,
  .taxonomy-header {
    padding: 48px 20px 40px;
  }

  .archive-content,
  .taxonomy-content {
    padding: 40px 20px 56px;
  }

  .archive-year {
    font-size: 24px;
  }

  .archive-item {
    flex-direction: column;
    gap: 4px;
  }

  .pagination {
    padding: 32px 20px;
  }

  .pagination__link {
    padding: 8px 16px;
    font-size: 11px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }

  .footer-meta {
    text-align: center;
  }

  .section-heading {
    margin-bottom: 32px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 26px;
  }

  .article-header__title {
    font-size: 24px;
  }
}