/* 满天星星 — 站点布局与排版 */

:root {
  --color-bg: #f1f1f1;
  --color-surface: #ffffff;
  --color-text: #333333;
  --color-muted: #666666;
  --color-meta: #888888;
  --color-link: #21759b;
  --color-link-hover: #135e96;
  --color-topbar: #23282d;
  --color-topbar-text: #eeeeee;
  --color-border: #e5e5e5;
  --color-border-post: #dddddd;
  --color-masthead-bg: #ffffff;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
  --content-width: 100%;
  --sidebar-width: 280px;
  --container-max: 1140px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

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

/* 顶栏导航（浅色横条，原 banner 风格） */
.site-topbar {
  background: var(--color-masthead-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-topbar__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.site-topbar__brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 0;
  text-decoration: none;
  color: #222;
  flex-shrink: 0;
}

.site-topbar__brand:hover {
  text-decoration: none;
  color: #222;
}

.site-topbar__brand:hover .site-topbar__title,
.site-topbar__brand:hover .site-topbar__subtitle {
  color: var(--color-link);
}

.site-topbar__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #f0c000;
  color: #1a1a1a;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1;
  flex-shrink: 0;
}

.site-topbar__name {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.25;
  white-space: nowrap;
}

.site-topbar__title {
  color: #222;
}

.site-topbar__sep {
  font-weight: 400;
  color: #555;
}

.site-topbar__subtitle {
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #222;
}

.site-topnav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.15rem;
  margin: 0 0 0 auto;
  padding: 0;
}

.site-topnav__link {
  display: block;
  padding: 0.85rem 0.85rem;
  font-size: 0.9375rem;
  color: var(--color-text);
  text-decoration: none;
}

.site-topnav__link:hover {
  color: #00a0d2;
  text-decoration: none;
}

.site-topnav__link.is-active {
  color: #00a0d2;
  text-decoration: none;
}

/* 站点标题区 Banner（深色底，原顶栏风格） */
.site-masthead {
  background: var(--color-topbar);
  border-bottom: 3px solid #0073aa;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.site-masthead__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.site-masthead__title {
  margin: 0 0 var(--space-sm);
  font-size: 1.75rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.35;
}

.site-masthead__title a {
  color: var(--color-topbar-text);
  text-decoration: none;
}

.site-masthead__title a:hover {
  color: #fff;
  text-decoration: none;
}

.site-masthead__tagline {
  margin: 0;
  font-size: 0.9375rem;
  color: #b0b5ba;
  font-style: italic;
}

/* 主栏 + 侧栏 */
.site-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
}

.site-content {
  flex: 1;
  min-width: 0;
  background: var(--color-surface);
  padding: var(--space-lg) var(--space-xl);
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.site-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
}

/* 侧栏小工具 */
.widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.widget__title {
  margin: 0;
  padding: 0.65rem 1rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #222;
  background: #fafafa;
  border-bottom: 1px solid var(--color-border);
}

.widget__body {
  padding: var(--space-md) 1rem;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-muted);
}

.widget__body p {
  margin: 0 0 var(--space-sm);
}

.widget__body p:last-child {
  margin-bottom: 0;
}

.widget__media {
  margin: 0 0 var(--space-sm);
}

.widget__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.widget__actions {
  margin: var(--space-md) 0 0;
  text-align: center;
}

.widget__btn {
  display: inline-block;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: #0073aa;
  border-radius: 4px;
  text-decoration: none;
}

.widget__btn:hover {
  color: #fff;
  background: #005a87;
  text-decoration: none;
}

.widget-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
}

.widget-list__item {
  margin: 0;
  padding: 0;
  border-bottom: 1px dotted #eee;
}

.widget-list__item:last-child {
  border-bottom: none;
}

.widget-list__item a {
  display: block;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  color: var(--color-link);
  line-height: 1.4;
}

.widget-list__item a:hover {
  background: #f9f9f9;
  text-decoration: none;
}

.widget-list__empty {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--color-meta);
}

/* 页脚 */
.site-footer {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg);
  font-size: 0.8125rem;
  color: var(--color-meta);
  text-align: center;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

/* 列表页栏目标题 */
.page-heading,
.post-list__heading {
  font-size: 1.375rem;
  font-weight: 600;
  margin: 0 0 var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
  color: #222;
}

/* 文章卡片（首页/列表） */
.post-card {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border-post);
}

.post-card:first-child {
  padding-top: 0;
}

.post-card:last-child {
  border-bottom: none;
}

.post-card__title {
  margin: 0 0 var(--space-sm);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.35;
}

.post-card__title a {
  color: #222;
  text-decoration: none;
}

.post-card__title a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.post-card__meta {
  margin: 0 0 var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-meta);
}

.post-card__sep {
  margin: 0 0.35rem;
}

.post-card__cat a {
  color: var(--color-meta);
}

.post-card__excerpt {
  margin: 0 0 var(--space-md);
  color: var(--color-text);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.post-card__excerpt p {
  margin: 0;
}

.post-card__more {
  margin: 0;
  font-size: 0.875rem;
}

.post-card__more a {
  font-weight: 600;
}

/* 兼容旧 list-item 类名 */
.list-item {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border-post);
}

.list-item__title {
  margin: 0 0 var(--space-sm);
  font-size: 1.5rem;
  font-weight: 600;
}

.list-item__title a {
  color: #222;
  text-decoration: none;
}

.list-item__title a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.list-item__meta {
  margin: 0 0 var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-meta);
}

.list-item__summary {
  margin: 0 0 var(--space-md);
  line-height: 1.75;
}

.list-item__tags {
  margin: 0 0 var(--space-sm);
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.1rem 0.45rem;
  margin-right: var(--space-xs);
  border: 1px solid var(--color-border);
  background: #fafafa;
  color: var(--color-muted);
}

.btn-link {
  font-size: 0.875rem;
  font-weight: 600;
}

/* 详情页 */
.article-detail__title {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  color: #222;
  line-height: 1.35;
}

.article-detail__meta {
  font-size: 0.8125rem;
  color: var(--color-meta);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px dotted var(--color-border);
}

.article-detail__body {
  line-height: 1.8;
  font-size: 0.9375rem;
}

.article-detail__body h2,
.article-detail__body h3,
.article-detail__body h4 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: #222;
  font-weight: 600;
}

.article-detail__body h2 {
  font-size: 1.25rem;
}

.article-detail__body h3 {
  font-size: 1.125rem;
}

.article-detail__body p {
  margin: 0 0 var(--space-md);
}

.article-detail__body ul,
.article-detail__body ol {
  margin: 0 0 var(--space-md);
  padding-left: 1.5rem;
}

.article-detail__body blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  border-left: 4px solid #0073aa;
  background: #f9f9f9;
  color: var(--color-muted);
}

.article-detail__body pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: var(--space-md);
  overflow-x: auto;
  background: #f5f5f5;
  border: 1px solid var(--color-border);
  line-height: 1.5;
}

.article-detail__body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: #f5f5f5;
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

.article-detail__body pre code {
  background: none;
  padding: 0;
}

.article-detail__body .article-figure {
  margin: var(--space-lg) 0;
}

.article-detail__body .article-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.article-detail__body .article-figure figcaption {
  margin-top: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-meta);
  text-align: center;
  line-height: 1.5;
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
}

.about-page p {
  margin: 0 0 var(--space-md);
}

.about-page ul {
  padding-left: 1.5rem;
}

.site-error,
.list-error,
.detail-error {
  color: #b32d2e;
  padding: var(--space-md);
  background: #fef7f7;
  border: 1px solid #f5c2c7;
}

.noscript-banner {
  margin: 0;
  padding: var(--space-md);
  background: #fff3cd;
  color: #664d03;
  text-align: center;
  border-bottom: 1px solid #ffc107;
}

[hidden] {
  display: none !important;
}

/* 响应式：窄屏侧栏下沉 */
@media (max-width: 900px) {
  .site-container {
    flex-direction: column;
  }

  .site-sidebar {
    width: 100%;
  }

  .site-masthead__title {
    font-size: 1.375rem;
    letter-spacing: 0.03em;
  }

  .site-topbar__name {
    font-size: 0.875rem;
  }

  .site-topbar__mark {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .site-topnav__link {
    padding: 0.65rem 0.5rem;
    font-size: 0.875rem;
  }

  .site-content {
    padding: var(--space-md);
  }
}

@media (max-width: 600px) {
  .site-topnav__link {
    padding: 0.6rem 0.65rem;
    font-size: 0.875rem;
  }
}