@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* =============================================
   CSS 变量 & 重置
   ============================================= */
:root {
  --c-bg: #0D0D0D;
  --c-accent: #E5003A;
  --c-fg: #F5F5F5;
  --c-surface: #1A1A1A;
  --c-surface2: #242424;
  --c-border: #2E2E2E;
  --c-muted: #888888;
  --c-accent-dim: rgba(229, 0, 58, 0.15);

  --nav-w: 220px;
  --radius: 18px;
  --radius-sm: 6px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: 150ms ease;
}

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

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

body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-fg);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

/* =============================================
   页面骨架：侧边导航 + 主区域
   ============================================= */
.page-wrapper {
  display: flex;
  min-height: 100vh;
}

/* =============================================
   左侧固定导航
   ============================================= */
.sidenav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  z-index: 100;
  overflow-y: auto;
}

.sidenav__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin: 20px auto 8px;
  background: var(--c-accent);
  border-radius: var(--radius-sm);
  color: var(--c-fg);
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.sidenav__brand:hover {
  opacity: 0.85;
  color: var(--c-fg);
}

.nav-icon-brand {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--c-fg);
  line-height: 1;
}

.sidenav__nav {
  flex: 1;
  padding: 12px 0;
}

.sidenav__nav dl {
  display: flex;
  flex-direction: column;
}

.sidenav__nav dt {
  display: block;
}

.nav-link {
  display: block;
  padding: 10px 20px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-muted);
  line-height: 1.4;
  transition: color var(--transition), background var(--transition);
  border-left: 3px solid transparent;
}

.nav-link:hover,
.nav-link--active {
  color: var(--c-fg);
  background: var(--c-surface2);
  border-left-color: var(--c-accent);
}

.sidenav__cta {
  display: block;
  margin: 12px 16px 20px;
  padding: 10px 12px;
  background: var(--c-accent);
  color: var(--c-fg);
  font-size: 0.82rem;
  font-weight: 700;
  text-align: center;
  border-radius: var(--radius-sm);
  min-height: 40px;
  line-height: 20px;
  transition: opacity var(--transition);
}

.sidenav__cta:hover {
  opacity: 0.85;
  color: var(--c-fg);
}

/* =============================================
   主内容区
   ============================================= */
.main-area {
  margin-left: var(--nav-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

main {
  flex: 1;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================================
   Hero（首页）
   ============================================= */
.hero-section {
  position: relative;
  min-height: 70vh;
  background: var(--c-bg);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(229,0,58,0.18) 0%, transparent 60%);
  pointer-events: none;
}

.hero-slash {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--c-bg);
  clip-path: polygon(0 40px, 100% 0, 100% 100%, 0 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 80px 24px 120px;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.hero-h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--c-fg);
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--c-muted);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-cta {
  display: inline-block;
  padding: 14px 36px;
  background: var(--c-accent);
  color: var(--c-fg);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  min-height: 48px;
  line-height: 20px;
  transition: opacity var(--transition);
}

.hero-cta:hover {
  opacity: 0.85;
  color: var(--c-fg);
}

/* =============================================
   首页：分类卡片
   ============================================= */
.categories-section {
  padding: 60px 0 40px;
}

.categories-section h2,
.content-section h2,
.recent-section h2,
.tags-section h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.categories-section h2 span,
.content-section h2 span,
.recent-section h2 span,
.tags-section h3 span {
  display: inline;
}

.feat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.feat-card {
  border-radius: var(--radius);
  overflow: hidden;
}

.feat-card__inner {
  display: block;
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 24px;
  border-bottom: 3px solid var(--c-accent);
  transition: background var(--transition);
  height: 100%;
}

.feat-card__inner:hover {
  background: var(--c-surface2);
  color: var(--c-fg);
}

.feat-card__label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 8px;
}

.feat-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: 8px;
  line-height: 1.3;
}

.feat-card h3 span {
  display: inline;
}

.feat-card__desc {
  font-size: 0.85rem;
  color: var(--c-muted);
  line-height: 1.5;
  margin-bottom: 12px;
}

.feat-card__count {
  font-size: 0.78rem;
  color: var(--c-accent);
  font-weight: 600;
}

/* =============================================
   首页：正文内容
   ============================================= */
.content-section {
  padding: 40px 0;
}

.content-section article {
  max-width: 760px;
}

/* =============================================
   首页：最新入口
   ============================================= */
.recent-section {
  padding: 40px 0;
}

.recent-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.recent-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--c-surface);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.recent-item a:hover {
  background: var(--c-surface2);
  color: var(--c-fg);
}

.recent-item__title {
  font-size: 0.9rem;
  font-weight: 500;
  flex: 1;
}

.recent-item__cat {
  font-size: 0.75rem;
  color: var(--c-accent);
  background: var(--c-accent-dim);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

/* =============================================
   标签云
   ============================================= */
.tags-section {
  padding: 40px 0 60px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-pill {
  display: inline-block;
  padding: 6px 14px;
  background: var(--c-surface);
  color: var(--c-fg);
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 4px;
  border: 1px solid var(--c-border);
  min-height: 32px;
  line-height: 20px;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.tag-pill:hover {
  background: var(--c-accent);
  color: var(--c-fg);
  border-color: var(--c-accent);
}

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--c-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--c-muted);
  transition: color var(--transition);
}

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

.breadcrumb span[aria-hidden] {
  color: var(--c-border);
}

/* =============================================
   eyebrow / meta
   ============================================= */
.cat-eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.entry-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.meta-item {
  font-size: 0.8rem;
  color: var(--c-muted);
}

.meta-item time {
  color: var(--c-muted);
}

.entry-date {
  font-size: 0.75rem;
  color: var(--c-muted);
  white-space: nowrap;
}

.page-date {
  display: block;
  font-size: 0.8rem;
  color: var(--c-muted);
  margin-top: 8px;
}

/* =============================================
   分类页英雄区
   ============================================= */
.cat-hero {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 40px;
}

.cat-hero__content h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
  color: var(--c-fg);
}

.cat-hero__desc {
  font-size: 0.95rem;
  color: var(--c-muted);
  max-width: 600px;
  line-height: 1.7;
  margin-top: 12px;
}

/* =============================================
   分类 / 入口 / 标签：两栏布局（aside在左）
   ============================================= */
.cat-body,
.entry-body,
.tag-body,
.about-body,
.privacy-body {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  padding: 0 0 60px;
  align-items: start;
}

.cat-aside,
.entry-aside,
.tag-aside,
.about-aside,
.privacy-aside {
  order: -1;
  position: sticky;
  top: 20px;
}

.cat-main,
.entry-content,
.tag-main,
.about-content,
.privacy-content {
  min-width: 0;
}

/* =============================================
   分类页：入口列表
   ============================================= */
.cat-main h2,
.tag-main h2,
.about-content h2,
.privacy-content h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-fg);
  margin: 32px 0 16px;
  letter-spacing: -0.02em;
}

.cat-main h2:first-child,
.tag-main h2:first-child,
.about-content h2:first-child,
.privacy-content h2:first-child {
  margin-top: 0;
}

.cat-main h2 span,
.tag-main h2 span,
.about-content h2 span,
.privacy-content h2 span {
  display: inline;
}

.entry-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 40px;
  counter-reset: none;
}

.entry-item {
  border-radius: var(--radius);
  background: var(--c-surface);
  border-bottom: 3px solid var(--c-border);
  overflow: hidden;
  transition: border-color var(--transition), background var(--transition);
}

.entry-item:hover {
  border-bottom-color: var(--c-accent);
  background: var(--c-surface2);
}

.entry-item__link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
}

.entry-item__link:hover {
  color: var(--c-fg);
}

.entry-item__num {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-accent);
  min-width: 36px;
  line-height: 1;
  opacity: 0.7;
}

.entry-item__body {
  flex: 1;
  min-width: 0;
}

.entry-item__title {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-fg);
  margin-bottom: 4px;
}

.entry-item__desc {
  display: block;
  font-size: 0.8rem;
  color: var(--c-muted);
  line-height: 1.4;
}

/* =============================================
   标签页：入口列表
   ============================================= */
.tag-hero {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 40px;
}

.tag-hero__content h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.tag-entry-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}

.tag-entry-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--c-surface);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  border-left: 3px solid transparent;
}

.tag-entry-item:hover {
  background: var(--c-surface2);
  border-left-color: var(--c-accent);
}

.tag-entry-item a {
  flex: 1;
  min-width: 0;
}

.tag-entry-item__title {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--c-fg);
}

.tag-entry-item__cat {
  font-size: 0.75rem;
  color: var(--c-accent);
  white-space: nowrap;
  background: var(--c-accent-dim);
  padding: 2px 8px;
  border-radius: 4px;
}

/* =============================================
   入口页
   ============================================= */
.entry-header-section {
  padding: 60px 0 32px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 40px;
}

.entry-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.sibling-link {
  display: flex;
  flex-direction: column;
  padding: 12px 14px;
  background: var(--c-surface);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  border-left: 3px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}

.sibling-link:hover {
  background: var(--c-surface2);
  border-left-color: var(--c-accent);
  color: var(--c-fg);
}

.sibling-link__title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-fg);
  margin-bottom: 2px;
}

.sibling-link__desc {
  font-size: 0.75rem;
  color: var(--c-muted);
  line-height: 1.4;
}

/* =============================================
   关于 / 隐私页
   ============================================= */
.about-header,
.privacy-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 40px;
}

.about-header__content h1,
.privacy-header__content h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

/* =============================================
   侧边栏 aside 块
   ============================================= */
.aside-block {
  margin-bottom: 28px;
  padding: 16px;
  background: var(--c-surface);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid var(--c-accent);
}

.aside-block h3 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.aside-block h3 span {
  display: inline;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-link {
  display: block;
  padding: 8px 10px;
  font-size: 0.84rem;
  color: var(--c-muted);
  border-radius: 4px;
  min-height: 36px;
  line-height: 20px;
  transition: color var(--transition), background var(--transition);
}

.aside-link:hover {
  color: var(--c-fg);
  background: var(--c-surface2);
}

.no-content {
  color: var(--c-muted);
  font-size: 0.9rem;
  padding: 24px 0;
}

/* =============================================
   正文 prose 排版
   ============================================= */
.prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-fg);
}

.prose h2, .prose h3, .prose h4 {
  font-weight: 700;
  color: var(--c-fg);
  margin: 28px 0 12px;
  letter-spacing: -0.02em;
}

.prose h2 { font-size: 1.2rem; }
.prose h3 { font-size: 1.05rem; }

.prose p {
  margin-bottom: 16px;
}

.prose a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  opacity: 0.8;
}

.prose ul, .prose ol {
  margin: 12px 0 16px 20px;
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 6px;
}

.prose blockquote {
  border-left: 3px solid var(--c-accent);
  padding-left: 16px;
  color: var(--c-muted);
  margin: 20px 0;
}

.prose code {
  background: var(--c-surface2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.87em;
}

.prose pre {
  background: var(--c-surface2);
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 16px 0;
}

.prose img {
  border-radius: var(--radius-sm);
  margin: 16px 0;
}

.prose--legal {
  font-size: 0.92rem;
  color: #c0c0c0;
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 32px 24px 20px;
  margin-top: auto;
}

.site-footer nav {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.footer-dl {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-dl__head {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.footer-dl dt a {
  font-size: 0.82rem;
  color: var(--c-muted);
  display: block;
  padding: 4px 0;
  min-height: 28px;
  line-height: 20px;
  transition: color var(--transition);
}

.footer-dl dt a:hover {
  color: var(--c-fg);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--c-muted);
  margin-top: 12px;
  display: block;
}

/* =============================================
   动效：parallax scroll（CSS只做非运动版）
   ============================================= */
@media (prefers-reduced-motion: no-preference) {
  .feat-card__inner {
    transition: background var(--transition), transform 150ms ease;
  }
  .feat-card__inner:hover {
    transform: translateY(-2px);
  }
  .entry-item {
    transition: border-color var(--transition), background var(--transition), transform 150ms ease;
  }
  .entry-item:hover {
    transform: translateX(2px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}

/* =============================================
   响应式：平板
   ============================================= */
@media (max-width: 1024px) {
  :root {
    --nav-w: 60px;
  }

  .sidenav {
    width: 60px;
    align-items: center;
  }

  .sidenav__brand {
    width: 44px;
    height: 44px;
    margin: 16px auto 8px;
  }

  .nav-link {
    padding: 12px 0;
    text-align: center;
    font-size: 0;
    border-left: none;
    border-bottom: 2px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
  }

  .nav-link::before {
    content: '●';
    font-size: 8px;
    color: var(--c-muted);
  }

  .nav-link--active::before,
  .nav-link:hover::before {
    color: var(--c-accent);
  }

  .sidenav__cta {
    font-size: 0;
    width: 44px;
    height: 44px;
    min-height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 8px auto 16px;
    border-radius: 50%;
  }

  .sidenav__cta::before {
    content: '→';
    font-size: 1.1rem;
    color: var(--c-fg);
  }

  .cat-body,
  .entry-body,
  .tag-body,
  .about-body,
  .privacy-body {
    grid-template-columns: 200px 1fr;
    gap: 24px;
  }
}

/* =============================================
   响应式：移动端
   ============================================= */
@media (max-width: 768px) {
  :root {
    --nav-w: 0px;
  }

  .sidenav {
    position: fixed;
    bottom: 0;
    top: auto;
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    border-right: none;
    border-top: 1px solid var(--c-border);
    z-index: 200;
    padding: 0 8px;
    overflow-x: auto;
    overflow-y: visible;
  }

  .sidenav__brand {
    width: 40px;
    height: 40px;
    min-width: 40px;
    margin: 8px 4px;
  }

  .sidenav__nav {
    flex: 1;
    padding: 0;
    overflow-x: auto;
  }

  .sidenav__nav dl {
    flex-direction: row;
  }

  .sidenav__nav dt {
    flex-shrink: 0;
  }

  .nav-link {
    padding: 0 10px;
    font-size: 0;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-left: none;
    border-bottom: 3px solid transparent;
  }

  .nav-link::before {
    content: '●';
    font-size: 7px;
    color: var(--c-muted);
  }

  .nav-link--active::before,
  .nav-link:hover::before {
    color: var(--c-accent);
  }

  .sidenav__cta {
    width: 40px;
    height: 40px;
    min-height: 40px;
    min-width: 40px;
    font-size: 0;
    padding: 0;
    margin: 8px 4px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .sidenav__cta::before {
    content: '→';
    font-size: 1rem;
    color: var(--c-fg);
  }

  .main-area {
    margin-left: 0;
    padding-bottom: 72px;
  }

  .wrap {
    padding: 0 16px;
  }

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

  .hero-content {
    padding: 60px 16px 100px;
  }

  .hero-h1 {
    font-size: 1.8rem;
  }

  .feat-cards {
    grid-template-columns: 1fr;
  }

  .cat-body,
  .entry-body,
  .tag-body,
  .about-body,
  .privacy-body {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .cat-aside,
  .entry-aside,
  .tag-aside,
  .about-aside,
  .privacy-aside {
    order: 1;
    position: static;
  }

  .site-footer nav {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .cat-hero,
  .tag-hero,
  .about-header,
  .privacy-header,
  .entry-header-section {
    padding: 32px 0 24px;
  }

  .entry-list {
    gap: 8px;
  }

  .entry-item__link {
    padding: 14px 16px;
  }
}

@media (max-width: 480px) {
  .site-footer nav {
    grid-template-columns: 1fr;
  }

  .breadcrumb {
    font-size: 0.75rem;
  }

  .entry-meta {
    flex-direction: column;
    gap: 4px;
  }
}