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

/* =============================================
   CSS 变量 & 全局重置
   ============================================= */
:root {
  --c-bg: #1c1726;
  --c-primary: #6514ff;
  --c-accent: #bf00ff;
  --c-surface: #251e35;
  --c-surface2: #2f2645;
  --c-text: #f0eaff;
  --c-text-muted: #a090c0;
  --c-border: #3d2f60;
  --c-neon-line: #6514ff;
  --nav-w: 220px;
  --gap-xl: 64px;
  --gap-lg: 48px;
  --gap-md: 32px;
  --gap-sm: 20px;
  --gap-xs: 12px;
  --radius: 0px;
  --font-sans: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: 220ms cubic-bezier(.4,0,.2,1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--c-bg);
  color: var(--c-text);
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* section 顶部留出固定导航高度（移动端顶栏） */
section[id] {
  scroll-margin-top: 72px;
}

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover, a:focus-visible {
  color: var(--c-primary);
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}

ul { list-style: none; }
img { max-width: 100%; display: block; }

/* =============================================
   布局骨架
   ============================================= */
.site-wrapper {
  display: flex;
  min-height: 100vh;
}

.main-wrapper {
  flex: 1;
  margin-left: var(--nav-w);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* =============================================
   左侧固定 Header/Nav
   ============================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  background: var(--c-surface);
  border-right: 2px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  padding: var(--gap-md) var(--gap-sm);
  z-index: 900;
  overflow-y: auto;
}

.brand-block {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
  text-decoration: none;
  outline: none;
  padding: 8px 0;
}
.brand-link:focus-visible {
  outline: 2px solid var(--c-primary);
}

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

.brand-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: 0.03em;
  line-height: 1.2;
}

/* 汉堡按钮 */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: var(--c-primary);
  border: none;
  cursor: pointer;
  padding: 10px 12px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  flex-shrink: 0;
}
.nav-toggle:hover {
  background: var(--c-accent);
}
.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  transition: transform var(--transition), opacity var(--transition);
}

/* 搜索框 */
.header-search {
  flex-shrink: 0;
}
.search-input {
  width: 100%;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 10px 12px;
  min-height: 40px;
  outline: none;
  transition: border-color var(--transition);
}
.search-input::placeholder {
  color: var(--c-text-muted);
}
.search-input:focus {
  border-color: var(--c-primary);
}

/* 侧边导航链接 */
.side-nav {
  flex: 1;
}
.side-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--gap-xs);
}
.side-nav-links a {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text-muted);
  padding: 10px 14px;
  border-left: 3px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  min-height: 44px;
  line-height: 1.4;
  text-decoration: none;
}
.side-nav-links a:hover,
.side-nav-links a:focus-visible {
  color: var(--c-text);
  border-left-color: var(--c-primary);
  background: rgba(101,20,255,0.12);
  outline: none;
}

/* =============================================
   全屏遮罩菜单
   ============================================= */
.fullscreen-nav {
  position: fixed;
  inset: 0;
  background: rgba(28,23,38,0.97);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}
.fullscreen-nav.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav-close {
  position: absolute;
  top: 24px;
  right: 32px;
  background: none;
  border: 2px solid var(--c-border);
  color: var(--c-text);
  font-size: 1.5rem;
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), color var(--transition);
}
.nav-close:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.fullscreen-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  text-align: center;
}
.fullscreen-nav-links a {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: 0.04em;
  padding: 12px 24px;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  position: relative;
  transition: color var(--transition);
}
.fullscreen-nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--c-accent);
  transition: transform var(--transition);
}
.fullscreen-nav-links a:hover {
  color: var(--c-accent);
}
.fullscreen-nav-links a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* =============================================
   Hero
   ============================================= */
.hero-block {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--c-bg);
  border-bottom: 2px solid var(--c-border);
}

/* 网格底纹动画 */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(101,20,255,0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(101,20,255,0.15) 1px, transparent 1px);
  background-size: 48px 48px;
  animation: gridMove 8s linear infinite;
  z-index: 0;
}
@keyframes gridMove {
  0%   { background-position: 0 0; }
  100% { background-position: 48px 48px; }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--gap-lg) var(--gap-md);
  max-width: 780px;
  width: 100%;
}

.hero-h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--c-text);
  margin-bottom: var(--gap-sm);
  background: linear-gradient(135deg, var(--c-text) 30%, var(--c-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--c-text-muted);
  margin-bottom: var(--gap-md);
  line-height: 1.7;
}

.hero-cta {
  display: inline-block;
  background: var(--c-primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 36px;
  min-height: 48px;
  letter-spacing: 0.05em;
  border: 2px solid var(--c-primary);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  text-decoration: none;
}
.hero-cta:hover, .hero-cta:focus-visible {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
  transform: translateY(-2px);
  outline: none;
}

/* =============================================
   主内容区
   ============================================= */
.site-main {
  flex: 1;
  padding: var(--gap-xl) var(--gap-lg);
}

.content-section {
  display: grid;
  grid-template-columns: 200px 80px 1fr;
  grid-template-rows: auto 1fr;
  gap: var(--gap-lg);
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

/* aside 放在内容左侧 */
.content-aside {
  grid-column: 1;
  grid-row: 1 / 3;
  position: sticky;
  top: var(--gap-md);
  align-self: start;
  background: var(--c-surface);
  border-left: 3px solid var(--c-primary);
  padding: var(--gap-sm);
}

.aside-eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-primary);
  text-transform: uppercase;
  margin-bottom: var(--gap-xs);
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.aside-nav-list li a {
  font-size: 0.82rem;
  color: var(--c-text-muted);
  display: block;
  padding: 6px 8px;
  min-height: 32px;
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  text-decoration: none;
}
.aside-nav-list li a:hover {
  color: var(--c-text);
  border-left-color: var(--c-accent);
}

/* figure 几何装饰 */
.content-figure {
  grid-column: 2;
  grid-row: 1 / 3;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  align-items: center;
  padding-top: var(--gap-xs);
}

.geo-decoration {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  animation: geoPulse 3s ease-in-out infinite;
}
.geo-1 {
  background: var(--c-primary);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  animation-delay: 0s;
}
.geo-2 {
  background: var(--c-accent);
  border-radius: 50%;
  animation-delay: 1s;
}
.geo-3 {
  background: transparent;
  border: 3px solid var(--c-primary);
  animation-delay: 2s;
}
@keyframes geoPulse {
  0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.8; }
  50% { transform: scale(1.15) rotate(8deg); opacity: 1; }
}

/* 正文内容 */
.page-content-wrap {
  grid-column: 3;
  grid-row: 1 / 3;
  min-width: 0;
}

/* 正文内部 section 样式 */
.page-content-wrap section {
  margin-bottom: var(--gap-xl);
  padding-bottom: var(--gap-lg);
  border-bottom: 1px solid var(--c-border);
}
.page-content-wrap section:last-child {
  border-bottom: none;
}

.page-content-wrap h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: var(--gap-sm);
  padding-bottom: var(--gap-xs);
  border-bottom: 3px solid var(--c-primary);
  letter-spacing: 0.02em;
}

.page-content-wrap h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-accent);
  margin-top: var(--gap-md);
  margin-bottom: var(--gap-xs);
}

.page-content-wrap p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text);
  margin-bottom: var(--gap-sm);
}

.page-content-wrap ul,
.page-content-wrap ol {
  padding-left: 1.5em;
  margin-bottom: var(--gap-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-content-wrap ul { list-style: disc; }
.page-content-wrap ol { list-style: decimal; }

.page-content-wrap li {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-text);
}

.page-content-wrap strong {
  color: var(--c-accent);
  font-weight: 700;
}

.page-content-wrap blockquote {
  border-left: 4px solid var(--c-primary);
  background: var(--c-surface);
  padding: var(--gap-sm) var(--gap-md);
  margin: var(--gap-sm) 0;
  font-style: italic;
  color: var(--c-text-muted);
}

.page-content-wrap table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--gap-sm);
  font-size: 0.95rem;
}
.page-content-wrap th {
  background: var(--c-primary);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}
.page-content-wrap td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
}
.page-content-wrap tr:hover td {
  background: var(--c-surface);
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--c-surface);
  border-top: 2px solid var(--c-border);
  margin-top: auto;
}

/* 大 CTA 块 */
.footer-cta-block {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  padding: var(--gap-xl) var(--gap-lg);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-sm);
}

.footer-eyebrow {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
}

.footer-cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}

.footer-cta-btn {
  display: inline-block;
  background: var(--c-bg);
  color: var(--c-accent);
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 40px;
  min-height: 48px;
  border: 2px solid var(--c-bg);
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
  letter-spacing: 0.05em;
}
.footer-cta-btn:hover, .footer-cta-btn:focus-visible {
  background: transparent;
  color: #fff;
  border-color: #fff;
  outline: none;
}

/* 页脚两栏 */
.footer-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-xl);
  padding: var(--gap-xl) var(--gap-lg);
  max-width: 1100px;
  margin: 0 auto;
}

.footer-address {
  display: flex;
  flex-direction: column;
  gap: var(--gap-xs);
  font-style: normal;
}

.footer-brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: 0.03em;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  line-height: 1.6;
}

.footer-contact-link {
  font-size: 0.875rem;
  color: var(--c-primary);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-link-list li a {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  min-height: 40px;
  display: flex;
  align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition);
}
.footer-link-list li a:hover {
  color: var(--c-text);
  border-bottom-color: var(--c-primary);
}

/* 底栏 */
.footer-bottom {
  border-top: 1px solid var(--c-border);
  padding: var(--gap-sm) var(--gap-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--gap-xs);
}

.footer-copy,
.footer-meta {
  font-size: 0.8rem;
  color: var(--c-text-muted);
}

/* =============================================
   标题装饰 small
   ============================================= */
small.aside-eyebrow,
small.footer-eyebrow {
  font-family: var(--font-mono);
}

/* 为 build 自动补 small + h2/h3 组合提供样式 */
small + h2,
small + h3 {
  margin-top: 4px;
}
small:not([class]) {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-primary);
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: 4px;
}

/* =============================================
   Scroll Reveal 动效
   ============================================= */
.reveal-section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 400ms ease, transform 400ms ease;
}
.reveal-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-section {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-bg-grid {
    animation: none;
  }
  .geo-decoration {
    animation: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* =============================================
   响应式 — 平板 ≤1024px
   ============================================= */
@media (max-width: 1024px) {
  :root {
    --nav-w: 180px;
  }

  .content-section {
    grid-template-columns: 160px 60px 1fr;
    gap: var(--gap-md);
  }

  .site-main {
    padding: var(--gap-lg) var(--gap-md);
  }

  .footer-body {
    padding: var(--gap-lg) var(--gap-md);
  }

  .footer-cta-block {
    padding: var(--gap-lg) var(--gap-md);
  }
}

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

  /* 移动端 header 变顶栏 */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    padding: 10px 16px;
    gap: var(--gap-xs);
    border-right: none;
    border-bottom: 2px solid var(--c-border);
    overflow: visible;
  }

  .brand-block {
    flex: 1;
  }

  .brand-text {
    font-size: 0.95rem;
  }

  .side-nav {
    display: none;
  }

  .header-search {
    display: none;
  }

  .nav-toggle {
    order: 2;
    flex-shrink: 0;
  }

  .main-wrapper {
    margin-left: 0;
    margin-top: 62px;
  }

  section[id] {
    scroll-margin-top: 80px;
  }

  /* 正文区单列 */
  .content-section {
    display: block;
  }

  .content-aside {
    position: static;
    margin-bottom: var(--gap-md);
  }

  .content-figure {
    display: none;
  }

  .site-main {
    padding: var(--gap-md) 16px;
  }

  /* Hero */
  .hero-content {
    padding: var(--gap-lg) 16px;
  }

  /* 页脚 */
  .footer-body {
    grid-template-columns: 1fr;
    gap: var(--gap-md);
    padding: var(--gap-md) 16px;
  }

  .footer-bottom {
    padding: var(--gap-sm) 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .footer-cta-block {
    padding: var(--gap-lg) 16px;
  }

  /* 内容区字号保底 */
  .page-content-wrap p,
  .page-content-wrap li {
    font-size: 1rem;
  }
}

/* =============================================
   最小宽度保底 375px
   ============================================= */
@media (max-width: 400px) {
  .hero-cta {
    padding: 12px 20px;
    font-size: 0.9rem;
  }
  .footer-cta-btn {
    padding: 12px 24px;
  }
}