@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300&display=swap');

/* ===== 基础重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background: #000;
  color: #fff;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Source Serif 4', 'Playfair Display', Georgia, serif;
  font-weight: 400;
  line-height: 1.65;
  background: #000;
  color: #fff;
  overflow-x: hidden;
  /* 底部导航条高度补偿 */
  padding-bottom: 56px;
}

/* ===== 12栏网格基础 ===== */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

/* ===== 全局链接 ===== */
a {
  color: inherit;
  text-decoration: none;
}

a:hover, a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

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

ul, ol {
  list-style: none;
}

/* ===== 页面包裹 ===== */
.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== 底部固定导航条 ===== */
.site-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #000;
  border-top: 1px solid #fff;
  padding: 0 1rem;
  height: 56px;
  display: flex;
  align-items: center;
}

.site-nav ol {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.site-nav ol::-webkit-scrollbar {
  display: none;
}

.site-nav ol li {
  flex-shrink: 0;
}

.site-nav ol li a {
  display: flex;
  align-items: center;
  height: 56px;
  padding: 0 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: #fff;
  white-space: nowrap;
  border-right: 1px solid rgba(255,255,255,0.15);
  transition: background 0.18s ease, color 0.18s ease;
}

.site-nav ol li:first-child a {
  border-left: 1px solid rgba(255,255,255,0.15);
}

.site-nav ol li a:hover,
.site-nav ol li a:focus-visible {
  background: #fff;
  color: #000;
  text-decoration: none;
}

/* 给锚点区块留出导航条空间 */
article[id] {
  scroll-margin-top: 0;
}

/* ===== 主区域 ===== */
.site-main {
  flex: 1;
}

.home-article {
  width: 100%;
}

/* ===== Hero 区块 ===== */
.hero-block {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}

/* 网格底纹 */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 4rem 1.5rem 5rem;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.hero-brand {
  margin-bottom: 2.5rem;
}

.brand-link {
  display: inline-block;
}

.brand-text {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.4);
  padding: 0.4rem 1.2rem;
  display: inline-block;
}

.brand-logo {
  max-height: 48px;
  width: auto;
  filter: invert(1);
}

.hero-h1 {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: #fff;
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-family: 'Source Serif 4', serif;
  font-weight: 300;
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.6;
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 2rem;
  background: #fff;
  color: #000;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  border: 1px solid #fff;
  transition: background 0.2s ease, color 0.2s ease;
}

.hero-cta:hover,
.hero-cta:focus-visible {
  background: transparent;
  color: #fff;
  text-decoration: none;
}

/* ===== 内容布局：aside + 正文 ===== */
.content-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0;
  align-items: start;
}

/* ===== Aside 侧边栏（左侧） ===== */
.site-aside {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,0.15);
  padding: 2.5rem 1.5rem 2rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.2) transparent;
}

.aside-inner {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.aside-title {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: #fff;
  margin-bottom: 0.25rem;
}

.aside-lead {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.aside-nav-list li a {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.55rem 0;
  font-family: 'Source Serif 4', serif;
  font-size: 0.82rem;
  font-weight: 400;
  color: rgba(255,255,255,0.6);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color 0.18s;
  min-height: 40px;
}

.aside-nav-list li a:hover,
.aside-nav-list li a:focus-visible {
  color: #fff;
  text-decoration: none;
}

.aside-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: rgba(255,255,255,0.3);
  flex-shrink: 0;
  letter-spacing: 0.05em;
}

/* ===== 正文主容器 ===== */
.main-content {
  padding: 3rem 2.5rem 4rem;
  min-width: 0;
}

/* 正文内部段落与标题样式 */
.main-content h1 {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.15;
  color: #fff;
  margin-bottom: 1.5rem;
}

.main-content h2 {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 2rem);
  line-height: 1.25;
  color: #fff;
  margin-top: 3.5rem;
  margin-bottom: 0.75rem;
  padding-top: 2.5rem;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.main-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.main-content h3 {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.3;
  color: #fff;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
}

.main-content p {
  font-family: 'Source Serif 4', serif;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.85);
  margin-bottom: 1.1rem;
  max-width: 68ch;
}

.main-content ul,
.main-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.1rem;
}

.main-content ul {
  list-style: disc;
}

.main-content ol {
  list-style: decimal;
}

.main-content li {
  font-family: 'Source Serif 4', serif;
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.82);
  margin-bottom: 0.4rem;
}

.main-content a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255,255,255,0.4);
  transition: text-decoration-color 0.18s;
}

.main-content a:hover {
  text-decoration-color: #fff;
}

.main-content strong {
  font-weight: 600;
  color: #fff;
}

.main-content em {
  font-style: italic;
  color: rgba(255,255,255,0.9);
}

.main-content blockquote {
  border-left: 3px solid rgba(255,255,255,0.4);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  color: rgba(255,255,255,0.6);
  font-style: italic;
}

.main-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: rgba(255,255,255,0.08);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.main-content pre {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 1.25rem;
  overflow-x: auto;
  border-radius: 4px;
  margin-bottom: 1.25rem;
}

.main-content pre code {
  background: transparent;
  padding: 0;
  font-size: 0.875rem;
}

.main-content hr {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.12);
  margin: 2.5rem 0;
}

.main-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.main-content th,
.main-content td {
  text-align: left;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.82);
}

.main-content th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.45);
  font-weight: 500;
  border-bottom-color: rgba(255,255,255,0.25);
}

/* article 区块分隔 */
.main-content article {
  padding-top: 1rem;
  margin-bottom: 2rem;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #000;
  border-top: 1px solid rgba(255,255,255,0.2);
  margin-bottom: 0;
}

.footer-cta-block {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
}

.footer-cta-text {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.01em;
  text-align: center;
}

.footer-bottom {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  padding: 1.25rem 2rem;
  justify-content: space-between;
}

.footer-address {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.4);
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.footer-address a {
  color: rgba(255,255,255,0.5);
  transition: color 0.18s;
}

.footer-address a:hover {
  color: #fff;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.footer-links li a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.04em;
  border-right: 1px solid rgba(255,255,255,0.1);
  transition: color 0.18s;
}

.footer-links li:first-child a {
  border-left: 1px solid rgba(255,255,255,0.1);
}

.footer-links li a:hover,
.footer-links li a:focus-visible {
  color: #fff;
  text-decoration: none;
}

.footer-copy {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

/* ===== subtitle 抽签契约 ===== */
.subtitle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.05em;
  line-height: 1.5;
  margin-top: 0.3rem;
  margin-bottom: 1rem;
}

/* h2 + p.subtitle 模式 */
.main-content h2 + p.subtitle,
.main-content h2 + p.subhead,
.main-content h2 + p.desc,
.main-content h2 + p.lead {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.04em;
  margin-top: 0.2rem;
  margin-bottom: 1.25rem;
}

/* ===== 动效：Scroll Reveal ===== */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.55s ease, transform 0.55s ease;
  }

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

  /* Hover micro-interactions */
  .site-aside .aside-nav-list li a {
    transition: color 0.2s ease, padding-left 0.2s ease;
  }

  .site-aside .aside-nav-list li a:hover {
    padding-left: 0.4rem;
  }

  .hero-cta {
    transition: background 0.22s ease, color 0.22s ease, transform 0.18s ease;
  }

  .hero-cta:hover {
    transform: translateY(-2px);
  }

  .site-nav ol li a {
    transition: background 0.18s ease, color 0.18s ease;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }

  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== 响应式断点 ===== */

/* 平板 */
@media (max-width: 900px) {
  .content-layout {
    grid-template-columns: 180px 1fr;
  }

  .site-aside {
    padding: 2rem 1rem 1.5rem;
  }

  .main-content {
    padding: 2rem 1.5rem 3rem;
  }
}

/* 移动端 */
@media (max-width: 640px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .site-aside {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.12);
    padding: 1.5rem 1rem 1rem;
  }

  .aside-nav-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }

  .aside-nav-list li a {
    font-size: 0.75rem;
    min-height: 40px;
    border-bottom-color: rgba(255,255,255,0.08);
  }

  .main-content {
    padding: 1.5rem 1rem 2.5rem;
  }

  .main-content h2 {
    margin-top: 2.5rem;
    padding-top: 2rem;
  }

  .hero-inner {
    padding: 3rem 1rem 4rem;
  }

  .hero-block {
    min-height: 65vh;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
    gap: 0.75rem;
  }

  .footer-links {
    width: 100%;
  }

  .footer-links li a {
    font-size: 0.65rem;
    padding: 0 0.6rem;
  }

  .site-nav ol li a {
    padding: 0 0.55rem;
    font-size: 0.65rem;
  }
}

@media (max-width: 375px) {
  .hero-h1 {
    font-size: 1.75rem;
  }

  .main-content p {
    font-size: 1rem;
  }
}