/* =========================================================
   Blog System
   Fonts
   - Section Title: Optima / URW Classico / Segoe UI / serif
   - Body Text: Suisse Int'l / Inter / system sans
   - Small Section Headings: Suisse Int'l / Inter / system sans
   ========================================================= */

:root {
  --blog-bg: #fffef2;
  --blog-bg-soft: #f0efe2;
  --blog-text: #1f1f1a;
  --blog-text-soft: #5f5c4f;
  --blog-border: #d9d5c3;
  --blog-link: #1f1f1a;
  --blog-max-width: 1440px;
  --blog-content-max: 860px;
  --blog-radius: 20px;
  --blog-radius-sm: 12px;
  --blog-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);

  --blog-font-heading: "Optima", "URW Classico", "Segoe UI", serif;
  --blog-font-body: "Suisse Int'l", "Suisse Intl", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --blog-font-subheading: "Suisse Int'l", "Suisse Intl", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --blog-space-2xs: 0.375rem;
  --blog-space-xs: 0.5rem;
  --blog-space-sm: 0.75rem;
  --blog-space-md: 1rem;
  --blog-space-lg: 1.5rem;
  --blog-space-xl: 2rem;
  --blog-space-2xl: 3rem;
  --blog-space-3xl: 4rem;
  --blog-space-4xl: 6rem;
}

/* =========================================================
   Base Blog Page
   ========================================================= */

body {
  background: var(--blog-bg);
  color: var(--blog-text);
}

.article,
.blog_content,
.blog_related,
.blog_nav,
.articles__title,
.articles__filter,
.articles {
  font-family: var(--blog-font-body);
  color: var(--blog-text);
}

.blog_content,
.article {
  background: var(--blog-bg);
}

/* =========================================================
   Blog Nav
   ========================================================= */

.blog_nav {
  background: var(--blog-bg-soft);
  border-bottom: 1px solid var(--blog-border);
}

.blog_nav .grid {
  align-items: center;
  min-height: 76px;
}

.blog_nav__title h3 {
  margin: 0;
  font-family: var(--blog-font-heading);
  font-weight: 700;
  font-size: clamp(1.5rem, 2vw, 2rem);
  line-height: 1.1;
  color: var(--blog-text);
}

.blog_nav__menu {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.blog_nav__menu a {
  position: relative;
  text-decoration: none;
  color: var(--blog-text);
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  padding-bottom: 0.2rem;
  transition: opacity 0.25s ease;
}

.blog_nav__menu a:hover {
  opacity: 0.7;
}

.blog_nav__menu a.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 100%;
  height: 2px;
  background: var(--blog-text);
}

/* =========================================================
   Blog Hero
   ========================================================= */

.blog_hero {
  background: var(--blog-bg-soft);
  padding: 0;
}

.blog_hero__image {
  display: block;
  width: 100%;
  height: clamp(260px, 42vw, 620px);
  object-fit: cover;
}

/* =========================================================
   Article Title / Meta Area
   ========================================================= */

.article__title {
  padding-top: var(--blog-space-3xl);
  padding-bottom: var(--blog-space-2xl);
}

.blog_meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--blog-space-sm) var(--blog-space-md);
  margin-bottom: var(--blog-space-lg);
}

.blog_meta__topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.blog_meta__topic {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--blog-text);
  background: var(--blog-bg-soft);
  border: 1px solid var(--blog-border);
  border-radius: 999px;
  padding: 0.5rem 0.875rem;
  transition: background 0.25s ease, border-color 0.25s ease, opacity 0.25s ease;
}

.blog_meta__topic:hover {
  opacity: 0.8;
}

.blog_meta__topic span {
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 0.8rem;
  line-height: 1;
}

.blog_meta__date {
  color: var(--blog-text-soft);
  font-family: var(--blog-font-body);
  font-weight: 400;
  font-size: 0.95rem;
  line-height: 1.4;
}

.blog_title h1 {
  margin: 0;
  font-family: var(--blog-font-heading);
  font-weight: 700;
  font-size: clamp(2.2rem, 4.5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--blog-text);
}

/* =========================================================
   Blog Content
   ========================================================= */

.blog_content {
  padding-bottom: var(--blog-space-4xl);
}

/* 让正文模块整体都限宽居中 */
.blog_content > * {
  max-width: var(--blog-content-max);
  margin-left: auto;
  margin-right: auto;
}

/* 让富文本内容内部常见元素也稳定居中 */
.blog_content p,
.blog_content ul,
.blog_content ol,
.blog_content h2,
.blog_content h3,
.blog_content h4,
.blog_content blockquote,
.blog_content figure,
.blog_content table {
  max-width: var(--blog-content-max);
  margin-left: auto;
  margin-right: auto;
}

.blog_content h2,
.blog_content h3,
.blog_content h4,
.blog_related__heading {
  font-family: var(--blog-font-heading);
  font-weight: 700;
  color: var(--blog-text);
  letter-spacing: -0.01em;
}

.blog_content h2 {
  font-size: clamp(1.75rem, 3vw, 2.6rem);
  line-height: 1.12;
  margin-top: var(--blog-space-3xl);
  margin-bottom: var(--blog-space-lg);
}

.blog_content h3 {
  font-size: clamp(1.35rem, 2vw, 1.8rem);
  line-height: 1.2;
  margin-top: var(--blog-space-2xl);
  margin-bottom: var(--blog-space-md);
}

.blog_content h4 {
  font-size: 1.1rem;
  line-height: 1.3;
  margin-top: var(--blog-space-xl);
  margin-bottom: var(--blog-space-sm);
}

.blog_content p,
.blog_content li,
.blog_content blockquote,
.blog_content figcaption,
.blog_content td,
.blog_content th {
  font-family: var(--blog-font-body);
  font-weight: 400;
  color: var(--blog-text);
  font-size: clamp(1rem, 1.1vw, 1.1rem);
  line-height: 1.8;
}

.blog_content p {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.blog_content a {
  color: var(--blog-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.blog_content ul,
.blog_content ol {
  margin-top: 0;
  margin-bottom: 1.5rem;
  padding-left: 1.25rem;
}

.blog_content li {
  margin-bottom: 0.5rem;
}

/* 图片块 */
.blog_content figure {
  margin-top: var(--blog-space-2xl);
  margin-bottom: var(--blog-space-2xl);
}

.blog_content__figure {
  max-width: var(--blog-content-max);
  margin-left: auto;
  margin-right: auto;
}

.blog_content img,
.blog_content__image {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--blog-radius);
}

/* figcaption */
.blog_content figcaption,
.blog_content__caption {
  color: var(--blog-text-soft);
  font-size: 0.95rem;
  margin-top: 0.75rem;
  text-align: center;
}

/* blockquote */
.blog_content blockquote {
  margin-top: var(--blog-space-2xl);
  margin-bottom: var(--blog-space-2xl);
  padding: 1.25rem 1.5rem;
  background: var(--blog-bg-soft);
  border-left: 4px solid var(--blog-border);
  border-radius: 0 var(--blog-radius-sm) var(--blog-radius-sm) 0;
}

/* 表格容器与样式 */
.blog_content table {
  width: 100%;
  max-width: var(--blog-content-max);
  border-collapse: collapse;
  margin-top: var(--blog-space-2xl);
  margin-bottom: var(--blog-space-2xl);
  background: transparent;
}

.blog_content th,
.blog_content td {
  border: 1px solid var(--blog-border);
  padding: 0.9rem 1rem;
  text-align: left;
  vertical-align: top;
}

.blog_content th {
  background: var(--blog-bg-soft);
  font-family: var(--blog-font-subheading);
  font-weight: 700;
}

/* 长表格在小屏可横向滚动时更稳 */
.blog_content .table-wrap {
  max-width: var(--blog-content-max);
  margin: var(--blog-space-2xl) auto;
  overflow-x: auto;
}

/* =========================================================
   Related Articles
   ========================================================= */

.blog_related {
  background: var(--blog-bg-soft);
  padding: var(--blog-space-3xl) 0 var(--blog-space-4xl);
  border-top: 1px solid var(--blog-border);
}

.blog_related__inner {
  width: 100%;
}

.blog_related__heading {
  margin: 0 0 var(--blog-space-xl);
  font-size: clamp(1.75rem, 2.5vw, 2.5rem);
  line-height: 1.1;
}

.blog_related__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.blog_related__card {
  min-width: 0;
}

.blog_related__link {
  display: block;
  height: 100%;
  text-decoration: none;
  color: inherit;
  background: var(--blog-bg);
  border: 1px solid var(--blog-border);
  border-radius: var(--blog-radius);
  overflow: hidden;
  box-shadow: var(--blog-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
}

.blog_related__link:hover {
  transform: translateY(-2px);
  opacity: 0.95;
}

.blog_related__imageWrap {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--blog-bg-soft);
}

.blog_related__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.blog_related__body {
  padding: 1.25rem;
}

.blog_related__title {
  margin: 0 0 0.75rem;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.35;
  color: var(--blog-text);
}

.blog_related__date {
  display: inline-block;
  font-family: var(--blog-font-body);
  font-weight: 400;
  font-size: 0.92rem;
  color: var(--blog-text-soft);
}

/* =========================================================
   Blog Listing Page
   ========================================================= */

.articles__title {
  padding-top: var(--blog-space-3xl);
  padding-bottom: var(--blog-space-lg);
  background: var(--blog-bg);
}

.articles__title h1 {
  margin: 0;
  font-family: var(--blog-font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.05;
  color: var(--blog-text);
}

.articles__filter {
  padding-bottom: var(--blog-space-xl);
  background: var(--blog-bg);
}

.articles__topics h5 {
  margin: 0 0 1rem;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--blog-text-soft);
}

.articles__topic {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0 0.625rem 0.625rem 0;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  background: var(--blog-bg-soft);
  border: 1px solid var(--blog-border);
  text-decoration: none;
  color: var(--blog-text);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.articles__topic:hover {
  opacity: 0.82;
}

.articles__topic--active {
  background: var(--blog-text);
  border-color: var(--blog-text);
  color: var(--blog-bg);
}

.articles__topic h6,
.articles__topic small {
  margin: 0;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 0.84rem;
  line-height: 1;
}

.articles {
  padding-bottom: var(--blog-space-4xl);
  background: var(--blog-bg);
}

.articles__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.articles__paginate {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: var(--blog-space-2xl);
}

.articles__paginate a {
  text-decoration: none;
  color: var(--blog-text);
  background: var(--blog-bg-soft);
  border: 1px solid var(--blog-border);
  border-radius: 999px;
  padding: 0.8rem 1.2rem;
  transition: opacity 0.25s ease;
}

.articles__paginate a:hover {
  opacity: 0.82;
}

.articles__paginate h6,
.articles__paginate small {
  margin: 0;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 0.85rem;
  line-height: 1;
}

/* =========================================================
   Optional: Generic Article Card Support
   ========================================================= */

.articleCard,
.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--blog-bg);
  border: 1px solid var(--blog-border);
  border-radius: var(--blog-radius);
  overflow: hidden;
  box-shadow: var(--blog-shadow);
}

.articleCard__image,
.article-card__image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}

.articleCard__body,
.article-card__body {
  padding: 1.25rem;
}

.articleCard__title,
.article-card__title {
  margin: 0 0 0.75rem;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.35;
  color: var(--blog-text);
}

.articleCard__meta,
.article-card__meta {
  font-family: var(--blog-font-body);
  font-weight: 400;
  font-size: 0.92rem;
  color: var(--blog-text-soft);
}

/* =========================================================
   Article Card
   ========================================================= */

.articleCard {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: var(--blog-text);
  background: var(--blog-bg);
  border: 1px solid var(--blog-border);
  border-radius: var(--blog-radius);
  overflow: hidden;
  box-shadow: var(--blog-shadow);
  transition: transform 0.25s ease, opacity 0.25s ease, box-shadow 0.25s ease;
}

.articleCard:hover {
  transform: translateY(-2px);
  opacity: 0.96;
}

.articleCard__cover {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--blog-bg-soft);
}

.articleCard__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.articleCard__details {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.25rem;
}

.articleCard__title,
.articleCard__details h4 {
  margin: 0 0 0.75rem;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.35;
  color: var(--blog-text);
}

.articleCard__excerpt,
.articleCard__details p {
  margin: 0 0 1.25rem;
  font-family: var(--blog-font-body);
  font-weight: 400;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--blog-text-soft);
}

.articleCard__cta,
.articleCard__details h6 {
  margin: auto 0 0;
  font-family: var(--blog-font-subheading);
  font-weight: 700;
  font-size: 0.84rem;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blog-text);
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 1199px) {
  .blog_related__grid,
  .articles__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article__title {
    padding-top: var(--blog-space-2xl);
  }
}

@media (max-width: 767px) {
  .blog_nav .grid {
    min-height: auto;
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .blog_nav__title,
  .blog_nav__menu {
    width: 100%;
  }

  .blog_nav__menu {
    justify-content: flex-start;
    gap: 1rem;
    margin-top: 0.75rem;
  }

  .blog_hero__image {
    height: 240px;
  }

  .article__title {
    padding-top: 2rem;
    padding-bottom: 1.5rem;
  }

  .blog_title h1 {
    font-size: clamp(1.9rem, 8vw, 2.8rem);
  }

  .blog_meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .blog_content {
    padding-bottom: 3rem;
  }

  .blog_content h2 {
    margin-top: 2.25rem;
  }

  .blog_related {
    padding: 2.5rem 0 3rem;
  }

  .blog_related__grid,
  .articles__grid {
    grid-template-columns: 1fr;
  }

  .articles__paginate {
    flex-direction: column;
    align-items: flex-start;
  }

  .blog_content table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

@media (max-width: 479px) {
  .blog_meta__topics {
    gap: 0.5rem;
  }

  .blog_meta__topic,
  .articles__topic {
    padding: 0.55rem 0.85rem;
  }

  .blog_related__body {
    padding: 1rem;
  }
}