@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&family=Share+Tech+Mono&display=swap');

/* ===== 基础变量 ===== */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #000000;
  --c-border: #000000;
  --c-muted: #555555;
  --c-bg: #ffffff;
  --c-surface: #f5f5f5;
  --c-announce: #000000;

  --font-mono: 'Share Tech Mono', 'Fira Code', 'Courier New', monospace;
  --font-body: 'Fira Code', 'Share Tech Mono', monospace;

  --radius-card: 28px;
  --gap: 1rem;
  --max-w: 1200px;
  --grid-cols: 12;

  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 40px;
  --sp-6: 48px;
  --sp-8: 64px;
  --sp-10: 80px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; line-height: 1.6; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-black);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
ol, ul { list-style: none; }

/* ===== 网格容器 ===== */
.grid-container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-4);
}

/* ===== 公告条 ===== */
.announce-bar {
  background: var(--c-black);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-align: center;
  padding: var(--sp-1) var(--sp-2);
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== 顶部导航（两行：品牌行 + 菜单行）===== */
.site-header {
  border-bottom: 2px solid var(--c-black);
  background: var(--c-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand-row {
  border-bottom: 1px solid var(--c-black);
  padding-block: var(--sp-2);
}

.header-brand-row .grid-container {
  display: flex;
  align-items: center;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
}
.brand-link:hover { text-decoration: none; }

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-name {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-black);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-muted);
  letter-spacing: 0.06em;
  margin-left: var(--sp-1);
  display: none;
}

/* 结构抽签：header > nav > a×n（无 ul/li）*/
.header-nav-row {
  padding-block: 0;
}

.header-nav-row .grid-container {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  scrollbar-width: none;
}
.header-nav-row .grid-container::-webkit-scrollbar { display: none; }

.main-nav {
  display: flex;
  align-items: stretch;
  gap: 0;
  flex-wrap: nowrap;
}

.main-nav .nav-link {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--c-black);
  padding: var(--sp-2) var(--sp-3);
  border-right: 1px solid var(--c-black);
  white-space: nowrap;
  display: flex;
  align-items: center;
  min-height: 48px;
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
}
.main-nav .nav-link:first-child { border-left: 1px solid var(--c-black); }
.main-nav .nav-link:hover,
.main-nav .nav-link.is-active {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

/* ===== Hero（左图右文，点阵底纹，~45vh）===== */
.hero-section {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: stretch;
  overflow: hidden;
  border-bottom: 2px solid var(--c-black);
}

.hero-dot-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, #000 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-6);
  align-items: center;
  padding-block: var(--sp-8);
  position: relative;
  z-index: 1;
}

.hero-media {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-img {
  width: 100%;
  max-height: 340px;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 2px solid var(--c-black);
}

.hero-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  border: 2px solid var(--c-black);
  border-radius: var(--radius-card);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-surface);
  overflow: hidden;
}

.hero-placeholder-text {
  font-family: var(--font-mono);
  font-size: clamp(60px, 12vw, 140px);
  font-weight: 700;
  color: var(--c-black);
  opacity: 0.08;
  line-height: 1;
  user-select: none;
}

.hero-content {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--sp-3);
}

.hero-h1 {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.5vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--c-black);
}

.hero-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-muted);
  max-width: 480px;
}

.hero-cta {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* ===== 按钮 ===== */
.btn-primary,
.btn-secondary,
.btn-back {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 12px 24px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--c-black);
  color: var(--c-white);
  border: 2px solid var(--c-black);
}
.btn-primary:hover {
  background: var(--c-white);
  color: var(--c-black);
  text-decoration: none;
}

.btn-secondary {
  background: var(--c-white);
  color: var(--c-black);
  border: 2px solid var(--c-black);
}
.btn-secondary:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

.btn-back {
  background: transparent;
  color: var(--c-black);
  border: 1px solid var(--c-black);
}
.btn-back:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

/* ===== 正文区块 ===== */
.content-section {
  padding-block: var(--sp-8);
  border-bottom: 1px solid #e0e0e0;
}

/* 结构抽签：main > article > div > div（纯 div 层）*/
.content-main {
  max-width: 780px;
}

.content-main--wide {
  max-width: 960px;
}

.content-main--legal {
  max-width: 720px;
}

.prose-wrap {
  font-size: 16px;
  line-height: 1.8;
  color: #1a1a1a;
}

/* prose 内部样式 */
.prose-wrap h2 {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  margin-top: var(--sp-6);
  margin-bottom: var(--sp-1);
  letter-spacing: -0.01em;
}

/* 标题装饰：h2 后紧跟 hr */
.prose-wrap h2 + hr {
  border: none;
  border-top: 2px solid var(--c-black);
  margin-bottom: var(--sp-3);
}

.prose-wrap h3 {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  margin-top: var(--sp-4);
  margin-bottom: var(--sp-2);
}

.prose-wrap p {
  margin-bottom: var(--sp-3);
}

.prose-wrap ul,
.prose-wrap ol {
  list-style: disc;
  padding-left: var(--sp-4);
  margin-bottom: var(--sp-3);
}

.prose-wrap ol { list-style: decimal; }

.prose-wrap li {
  margin-bottom: var(--sp-1);
  line-height: 1.7;
}

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

.prose-wrap a:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
  border-radius: 2px;
  padding-inline: 2px;
}

.prose-wrap table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--sp-4);
  font-size: 14px;
}

.prose-wrap th,
.prose-wrap td {
  border: 1px solid var(--c-black);
  padding: var(--sp-1) var(--sp-2);
  text-align: left;
}

.prose-wrap th {
  background: var(--c-black);
  color: var(--c-white);
  font-weight: 600;
}

.prose-wrap blockquote {
  border-left: 4px solid var(--c-black);
  padding-left: var(--sp-3);
  margin-left: 0;
  margin-bottom: var(--sp-3);
  color: var(--c-muted);
  font-style: italic;
}

.prose-wrap code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--c-surface);
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1px 5px;
}

.prose-wrap pre {
  background: var(--c-black);
  color: var(--c-white);
  border-radius: 8px;
  padding: var(--sp-3);
  overflow-x: auto;
  margin-bottom: var(--sp-3);
  font-size: 13px;
}

.prose-wrap pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

/* 正文内 h2 后自动插 hr（通过 CSS 补充，不依赖 content 是否有 hr）*/
.prose-wrap h2:not(:has(+ hr))::after {
  content: '';
  display: block;
  border-top: 2px solid var(--c-black);
  margin-top: var(--sp-1);
  margin-bottom: var(--sp-3);
}

/* ===== 区块标题（模板自带 h2）===== */
.section-heading {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-top: var(--sp-6);
  margin-bottom: var(--sp-1);
}

.section-hr {
  border: none;
  border-top: 2px solid var(--c-black);
  margin-bottom: var(--sp-4);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  padding-block: var(--sp-3);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--c-muted); text-decoration: underline; }
.breadcrumb a:hover { color: var(--c-black); }
.breadcrumb span[aria-hidden] { color: #bbb; }

/* ===== 文章头 ===== */
.article-eyebrow,
.page-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  text-transform: uppercase;
  display: block;
  margin-bottom: var(--sp-2);
}

.article-h1,
.page-h1 {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-3);
}

.page-lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-muted);
  max-width: 680px;
  margin-bottom: var(--sp-4);
}

.article-header {
  padding-block: var(--sp-5) var(--sp-3);
  border-bottom: 1px solid #e0e0e0;
}

.about-header,
.privacy-header {
  padding-block: var(--sp-5) var(--sp-3);
  border-bottom: 1px solid #e0e0e0;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
}

.meta-label {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.meta-date { color: var(--c-black); }

.article-hero {
  margin-block: var(--sp-4);
}

.article-hero-img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 2px solid var(--c-black);
}

.article-back {
  padding-block: var(--sp-5);
}

/* ===== 栏目子页列表（结构抽签：ol > li > a + small）===== */
.subpage-section {
  padding-block: var(--sp-6);
  border-bottom: 1px solid #e0e0e0;
}

.cat-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap);
  margin-top: var(--sp-2);
}

.cat-item {
  border: 2px solid var(--c-black);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: background 0.15s;
}

.cat-item a {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding: var(--sp-3);
  text-decoration: none;
  min-height: 100px;
}

.cat-item a:hover { background: var(--c-black); }
.cat-item a:hover .cat-item-title,
.cat-item a:hover .cat-item-desc { color: var(--c-white); }

.cat-item-title {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-black);
  display: block;
}

.cat-item-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
  display: block;
}

.cat-item-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-muted);
  padding: var(--sp-1) var(--sp-3);
  border-top: 1px solid #e0e0e0;
}

/* ===== 首页精选卡片 ===== */
.featured-section {
  padding-block: var(--sp-8);
  border-bottom: 1px solid #e0e0e0;
}

.card-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--gap);
  margin-top: var(--sp-2);
}

.card {
  border: 2px solid var(--c-black);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.card a {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding: var(--sp-4);
  text-decoration: none;
  min-height: 140px;
}

.card a:hover { background: var(--c-black); }
.card a:hover .card-type,
.card a:hover .card-title,
.card a:hover .card-desc,
.card a:hover .card-date { color: var(--c-white); }

.card-type {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  display: block;
}

.card-title {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-black);
  display: block;
}

.card-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
  display: block;
  flex: 1;
}

.card-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-muted);
  display: block;
  margin-top: auto;
}

/* ===== 关于页导航列表 ===== */
.about-nav-block {
  padding-block: var(--sp-6);
}

.about-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  list-style: decimal;
  padding-left: var(--sp-4);
}

.about-nav-list li a {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-black);
  text-decoration: underline;
  text-underline-offset: 3px;
  padding-block: var(--sp-1);
  display: inline-block;
}

.about-nav-list li a:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
  border-radius: 2px;
  padding-inline: 4px;
}

/* ===== 隐私页底部导航 ===== */
.privacy-footer-nav {
  display: flex;
  gap: var(--sp-2);
  padding-block: var(--sp-5);
  flex-wrap: wrap;
}

/* ===== 页脚（三栏 dl 并排）===== */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  padding-top: var(--sp-8);
  border-top: 3px solid var(--c-black);
}

.footer-brand-row {
  padding-bottom: var(--sp-5);
  border-bottom: 1px solid #333;
  margin-bottom: var(--sp-5);
}

.footer-brand-huge {
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 100px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--c-white);
  opacity: 0.9;
  display: block;
}

/* 结构抽签：footer 三列 dl（三个 dl 并排）*/
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  padding-bottom: var(--sp-6);
  border-bottom: 1px solid #333;
}

.footer-col dt {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #888;
  margin-bottom: var(--sp-2);
  text-transform: uppercase;
}

.footer-col dd {
  margin-bottom: var(--sp-1);
}

.footer-col dd a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #ccc;
  text-decoration: none;
  padding-block: 4px;
  display: inline-block;
  min-height: 28px;
  transition: color 0.12s;
}

.footer-col dd a:hover {
  color: var(--c-white);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--sp-3);
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #666;
  line-height: 1.5;
}

.footer-links {
  display: flex;
  gap: var(--sp-3);
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #888;
  text-decoration: none;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding-inline: var(--sp-1);
}

.footer-links a:hover { color: var(--c-white); }

/* ===== 交错动效 ===== */
.stagger-list { }

.stagger-item {
  opacity: 0;
  transform: translateY(16px);
  animation: staggerIn 0.4s ease forwards;
  animation-delay: calc(var(--i, 0) * 80ms);
}

@keyframes staggerIn {
  to { opacity: 1; transform: translateY(0); }
}

/* hover 微交互 */
.cat-item,
.card {
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cat-item:hover,
.card:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--c-black);
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .stagger-item {
    opacity: 1;
    transform: none;
    animation: none;
  }
  .cat-item,
  .card {
    transition: none;
  }
  .cat-item:hover,
  .card:hover {
    transform: none;
    box-shadow: none;
  }
}

/* ===== 移动端断点 ===== */
@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
    padding-block: var(--sp-5);
  }

  .hero-content {
    text-align: left;
    align-items: flex-start;
  }

  .hero-cta {
    justify-content: flex-start;
  }

  .hero-media {
    order: -1;
  }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: var(--sp-3);
  }

  .footer-brand-huge {
    font-size: clamp(32px, 12vw, 60px);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
  }

  .card-list,
  .cat-list {
    grid-template-columns: 1fr;
  }

  .main-nav .nav-link {
    padding-inline: var(--sp-2);
    font-size: 12px;
  }

  .brand-tagline { display: none; }

  .grid-container {
    padding-inline: var(--sp-2);
  }

  .article-h1,
  .page-h1 {
    font-size: clamp(20px, 6vw, 32px);
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: clamp(18px, 6vw, 28px);
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary,
  .btn-back {
    width: 100%;
    justify-content: center;
  }

  .breadcrumb {
    font-size: 11px;
  }
}

/* ===== 品牌大字显示 ===== */
@media (min-width: 900px) {
  .brand-tagline { display: inline; }
}