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

/* ===========================
   CSS 变量 & 基础重置
=========================== */
:root {
  --green: #00ff80;
  --blue: #0000ff;
  --black: #000000;
  --white: #ffffff;
  --grey-dark: #111111;
  --grey-mid: #222222;
  --grey-light: #333333;
  --text: #e8e8e8;
  --text-dim: #aaaaaa;
  --border: 2px solid var(--green);
  --border-blue: 2px solid var(--blue);
  --font-main: 'Varela Round', 'Nunito Sans', system-ui, sans-serif;
  --font-body: 'Nunito Sans', system-ui, sans-serif;
  --radius: 0px;
  --transition: none;
  --max-w: 1200px;
  --side-w: 280px;
}

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

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

body {
  background: var(--black);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

a:hover, a:focus {
  color: var(--white);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

ul, ol { list-style: none; }

/* ===========================
   排版
=========================== */
h1, h2, h3, h4, h5 {
  font-family: var(--font-main);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
}

h1 { font-size: clamp(1.8rem, 5vw, 3rem); }
h2 { font-size: clamp(1.3rem, 3vw, 2rem); margin-bottom: 0.25em; }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p { margin-bottom: 1em; }

/* ===========================
   布局工具
=========================== */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ===========================
   Header / Brand
=========================== */
.site-header {
  background: var(--black);
  border-bottom: 3px solid var(--green);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

.brand-row {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--grey-light);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.brand-logo {
  height: 36px;
  width: auto;
}

.brand-name {
  font-family: var(--font-main);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: 0.02em;
}

.nav-row {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ===========================
   导航 aside > nav > ul > li > a
=========================== */
.site-aside {
  display: block;
  width: 100%;
}

.site-aside nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.6rem 0;
}

.site-aside nav ul li a {
  display: inline-block;
  padding: 0.45rem 1rem;
  background: var(--grey-mid);
  border: 2px solid var(--grey-light);
  border-radius: 9999px;
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 600;
  min-height: 40px;
  line-height: 1.4;
  white-space: nowrap;
  transition: var(--transition);
}

.site-aside nav ul li a:hover,
.site-aside nav ul li a:focus {
  background: var(--green);
  color: var(--black);
  border-color: var(--green);
  text-decoration: none;
}

/* ===========================
   Hero（首页双图错位）
=========================== */
.hero {
  min-height: 70vh;
  background: var(--black);
  border-bottom: 3px solid var(--blue);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 1.25rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  width: 100%;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  z-index: 2;
}

.hero-h1 {
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  color: var(--green);
  text-shadow: 3px 3px 0 var(--blue);
  line-height: 1.1;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 480px;
  line-height: 1.6;
  margin-bottom: 0;
}

.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-collage {
  position: relative;
  height: 400px;
}

.hero-img {
  position: absolute;
  object-fit: cover;
  border: 3px solid var(--green);
}

.hero-img-a {
  width: 70%;
  height: 70%;
  top: 0;
  left: 0;
  z-index: 2;
}

.hero-img-b {
  width: 65%;
  height: 65%;
  bottom: 0;
  right: 0;
  z-index: 1;
  border-color: var(--blue);
}

/* ===========================
   Buttons
=========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.5rem;
  border-radius: 9999px;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  border: 2px solid transparent;
  min-height: 44px;
  text-decoration: none;
  transition: var(--transition);
}

.btn-primary {
  background: var(--green);
  color: var(--black);
  border-color: var(--green);
}

.btn-primary:hover, .btn-primary:focus {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}

.btn-outline:hover, .btn-outline:focus {
  background: var(--blue);
  color: var(--white);
  text-decoration: none;
}

.btn-sm {
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  min-height: 36px;
  border-radius: 9999px;
  background: var(--grey-mid);
  color: var(--green);
  border: 2px solid var(--green);
}

.btn-sm:hover, .btn-sm:focus {
  background: var(--green);
  color: var(--black);
  text-decoration: none;
}

/* ===========================
   Inner Hero（内页）
=========================== */
.inner-hero {
  padding: 3rem 0 2rem;
  border-bottom: 2px solid var(--grey-light);
  margin-bottom: 2.5rem;
}

.inner-h1 {
  color: var(--green);
  margin-bottom: 0.5rem;
}

.topic-hero-label,
.tag-hero-label {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.update-date {
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

/* ===========================
   subtitle (h2 + p.subtitle)
=========================== */
.subtitle {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  margin-top: 0;
}

/* ===========================
   Content Layout（2列）
   main > article.wrap > div > section
=========================== */
.content-section {
  display: grid;
  grid-template-columns: 1fr var(--side-w);
  gap: 2.5rem;
  padding-bottom: 3rem;
  align-items: start;
}

.page-content {
  min-width: 0;
}

/* ===========================
   Prose（正文）
=========================== */
.prose h2 {
  margin-top: 2rem;
  margin-bottom: 0.4rem;
  padding-left: 0.75rem;
  border-left: 4px solid var(--green);
}

.prose h3 {
  margin-top: 1.5rem;
  color: var(--text);
}

.prose p {
  line-height: 1.75;
  color: var(--text);
}

.prose a {
  color: var(--green);
  border-bottom: 1px solid var(--green);
}

.prose ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.prose ol {
  list-style: decimal;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

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

.prose blockquote {
  border-left: 4px solid var(--blue);
  padding: 0.75rem 1.25rem;
  background: var(--grey-mid);
  margin: 1.5rem 0;
  color: var(--text-dim);
}

.prose code {
  background: var(--grey-mid);
  padding: 0.1em 0.4em;
  border-radius: var(--radius);
  font-size: 0.9em;
  color: var(--green);
}

.prose pre {
  background: var(--grey-mid);
  padding: 1rem;
  overflow-x: auto;
  border: 2px solid var(--grey-light);
  margin-bottom: 1.5rem;
}

/* ===========================
   Article Meta
=========================== */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  background: var(--grey-mid);
  border-left: 4px solid var(--blue);
}

.article-meta span { display: inline-flex; align-items: center; gap: 0.3rem; }
.article-meta a { color: var(--green); }
.article-h1 { margin-bottom: 0.5rem; }

.article-hero-wrap {
  margin-bottom: 1.5rem;
  border: 2px solid var(--grey-light);
  overflow: hidden;
}

.article-hero-img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

/* ===========================
   Aside（侧边栏，内容右侧）
=========================== */
.page-aside {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-width: 0;
}

.page-aside nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-aside nav ul li a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-left: 3px solid var(--grey-light);
  color: var(--text-dim);
  font-size: 0.875rem;
  min-height: 40px;
  line-height: 1.4;
}

.page-aside nav ul li a:hover,
.page-aside nav ul li a:focus {
  border-left-color: var(--green);
  color: var(--white);
  text-decoration: none;
}

.aside-related,
.aside-tags,
.aside-cats {
  border-top: 2px solid var(--grey-light);
  padding-top: 1.25rem;
}

.aside-related h2,
.aside-tags h2,
.aside-cats h2 {
  font-size: 0.95rem;
  color: var(--green);
  margin-bottom: 0.15rem;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.aside-link-item {
  display: block;
  padding: 0.5rem 0.75rem;
  background: var(--grey-mid);
  border: 1px solid var(--grey-light);
  color: var(--text);
  font-size: 0.875rem;
  min-height: 40px;
  line-height: 1.4;
  text-decoration: none;
}

.aside-link-item strong {
  display: block;
  font-weight: 600;
  color: var(--white);
}

.aside-link-item:hover,
.aside-link-item:focus {
  border-color: var(--green);
  background: var(--grey-light);
  text-decoration: none;
}

/* ===========================
   Glass Cards
=========================== */
.glass-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,255,128,0.2);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.glass-card:hover {
  border-color: var(--green);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0;
}

.card-title a {
  color: var(--white);
  text-decoration: none;
}

.card-title a:hover, .card-title a:focus {
  color: var(--green);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-count {
  display: inline-block;
  font-size: 0.75rem;
  background: var(--blue);
  color: var(--white);
  padding: 0.15rem 0.6rem;
  border-radius: 9999px;
  font-weight: 700;
}

.cat-label {
  display: inline-block;
  font-size: 0.75rem;
  background: var(--grey-mid);
  color: var(--green);
  padding: 0.15rem 0.6rem;
  border-radius: 9999px;
  margin-bottom: 0.25rem;
  text-decoration: none;
  border: 1px solid var(--green);
}

/* ===========================
   Grids
=========================== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.article-grid.sm {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

/* ===========================
   child-block-link（子页 a > strong）
=========================== */
.child-block-link {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.25rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,255,128,0.2);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  text-decoration: none;
  min-height: 44px;
}

.child-block-link strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}

.child-block-link .child-desc {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.child-block-link:hover,
.child-block-link:focus {
  border-color: var(--green);
  background: rgba(0,255,128,0.06);
  text-decoration: none;
}

/* ===========================
   Tag Cloud / Pills
=========================== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tag-cloud.small .tag-pill {
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  background: var(--grey-mid);
  border: 1px solid var(--grey-light);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 600;
  min-height: 40px;
  text-decoration: none;
  transition: var(--transition);
}

.tag-pill:hover, .tag-pill:focus {
  background: var(--green);
  color: var(--black);
  border-color: var(--green);
  text-decoration: none;
}

/* ===========================
   Sections Spacing
=========================== */
.home-topics,
.home-latest,
.home-tags {
  padding: 3rem 0;
  border-top: 2px solid var(--grey-light);
}

.topic-children,
.tag-articles,
.related-articles {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--grey-light);
}

/* ===========================
   Breadcrumb
=========================== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem 0;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-bottom: 1px solid var(--grey-light);
  margin-bottom: 1.5rem;
}

.breadcrumb a { color: var(--green); }
.breadcrumb a:hover { color: var(--white); text-decoration: none; }
.bc-sep { color: var(--grey-light); padding: 0 0.1rem; }

/* ===========================
   Footer
=========================== */
.site-footer {
  background: var(--grey-dark);
  border-top: 3px solid var(--green);
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-col dt {
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--grey-light);
}

.footer-col dd {
  margin-bottom: 0.4rem;
}

.footer-col dd a {
  color: var(--text-dim);
  font-size: 0.875rem;
  text-decoration: none;
}

.footer-col dd a:hover, .footer-col dd a:focus {
  color: var(--green);
}

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--grey-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.copyright {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
}

.footer-links a:hover, .footer-links a:focus {
  color: var(--green);
}

/* ===========================
   Scroll Reveal
=========================== */
.reveal-section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal-section.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal-section {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-collage { transform: none !important; }
}

/* Parallax hint on hero collage */
.hero-collage {
  will-change: transform;
}

/* ===========================
   Responsive
=========================== */
@media (max-width: 960px) {
  .content-section {
    grid-template-columns: 1fr;
  }
  .page-aside {
    position: static;
    border-top: 2px solid var(--grey-light);
    padding-top: 2rem;
  }
  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .hero-inner {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero {
    min-height: auto;
  }
  .hero-collage {
    height: 260px;
  }
  .hero-img-a {
    width: 65%;
    height: 65%;
  }
  .hero-img-b {
    width: 60%;
    height: 60%;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  .site-aside nav ul {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.4rem;
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .topic-grid {
    grid-template-columns: 1fr;
  }
  .inner-hero {
    padding: 2rem 0 1.5rem;
  }
}

@media (max-width: 480px) {
  .brand-name { font-size: 1.1rem; }
  .hero-h1 { font-size: 1.7rem; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; text-align: center; }
}