/* ==========================================================================
   NaNoCloud · 【风格 01 · 纳米矩阵】原生样式库
   深空蓝黑 #0A0F1E | 电光青 #22D3EE | 纯 CSS 纳米级高精质感
   ========================================================================== */

:root {
  --bg-space: #0A0F1E;
  --bg-card: rgba(13, 21, 39, 0.78);
  --bg-card-hover: rgba(18, 30, 54, 0.9);
  --border-nano: rgba(34, 211, 238, 0.18);
  --border-nano-glow: rgba(34, 211, 238, 0.45);
  --cyan-accent: #22D3EE;
  --cyan-glow: rgba(34, 211, 238, 0.32);
  --cyan-gradient: linear-gradient(135deg, #22D3EE 0%, #0284C7 100%);
  --text-pure: #FFFFFF;
  --text-light: #E2E8F0;
  --text-muted: #94A3B8;
  --text-dim: #8898AA;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --container-max: 1240px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

:focus-visible {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: #0D1527;
  color: var(--cyan-accent);
  border: 2px solid var(--cyan-accent);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 14px;
  z-index: 99999;
  transition: top 0.2s ease;
  text-decoration: none;
}

.skip-link:focus {
  top: 20px;
  outline: 2px solid var(--cyan-accent);
  outline-offset: 3px;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-space);
  color: var(--text-light);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-color: var(--bg-space);
  overflow-wrap: break-word;
  word-break: break-word;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  #nano-canvas {
    display: none !important;
  }
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* 中文标题超粗黑体 (思源黑体 Heavy / Noto Sans SC 900，回退苹方、微软雅黑) */
h1, h2, h3, h4, .hero-title, .section-title, .page-title {
  font-family: "Noto Sans SC", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 900;
  color: var(--text-pure);
  letter-spacing: -0.5px;
}

/* 数字专属字体 (Space Grotesk / 等宽回退) */
.stat-num, .price-amount, .nano-metric, .price-currency {
  font-family: "Space Grotesk", "SF Pro Display", "Roboto Mono", Consolas, monospace;
  font-weight: 700;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 12px 28px;
  min-height: 48px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--cyan-gradient);
  color: #050B14;
  font-weight: 800;
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.35);
  border-color: rgba(34, 211, 238, 0.6);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 28px rgba(34, 211, 238, 0.6);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(13, 21, 39, 0.7);
  color: var(--cyan-accent);
  border: 1px solid var(--border-nano-glow);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(34, 211, 238, 0.12);
  border-color: var(--cyan-accent);
  transform: translateY(-2px);
  box-shadow: 0 0 16px rgba(34, 211, 238, 0.25);
}

.btn-block {
  width: 100%;
}

/* 导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-nano);
  height: 72px;
  display: flex;
  align-items: center;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 900;
  color: var(--text-pure);
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid var(--cyan-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-accent);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14.5px;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--cyan-accent);
  text-shadow: 0 0 8px rgba(34, 211, 238, 0.5);
}

/* 页面头部通用 */
.page-header {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-nano);
  background: rgba(13, 21, 39, 0.5);
}

.page-title {
  font-size: 36px;
  margin-bottom: 12px;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 15.5px;
}

.page-content {
  padding: 60px 0 100px;
}

.content-block {
  background: var(--bg-card);
  border: 1px solid var(--border-nano);
  border-radius: var(--radius-md);
  padding: 38px;
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
}

.content-block h2 {
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--text-pure);
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-block h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--cyan-accent);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--cyan-accent);
}

.content-block p, .content-block li {
  color: #CBD5E1;
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.content-block ul {
  padding-left: 20px;
  list-style: disc;
  margin-bottom: 16px;
}

.content-block ul li {
  margin-bottom: 8px;
}

.back-home-wrap {
  margin-top: 40px;
  text-align: center;
}

/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-nano);
  border-radius: var(--radius-md);
  padding: 30px;
  backdrop-filter: blur(12px);
}

.sitemap-card h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--cyan-accent);
}

.sitemap-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sitemap-links a {
  color: #CBD5E1;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.sitemap-links a:hover {
  color: var(--cyan-accent);
  transform: translateX(4px);
  text-shadow: 0 0 8px rgba(34, 211, 238, 0.4);
}

/* 页脚 */
.footer {
  margin-top: auto;
  background-color: #060913;
  border-top: 1px solid var(--border-nano);
  padding: 46px 0 30px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 14.5px;
  font-weight: 500;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--cyan-accent);
  text-shadow: 0 0 8px rgba(34, 211, 238, 0.5);
}

.footer-bottom {
  text-align: center;
  padding-top: 22px;
  border-top: 1px solid rgba(34, 211, 238, 0.1);
  color: var(--text-dim);
  font-size: 12.5px;
}

/* 响应式媒体查询 */
@media (max-width: 768px) {
  .header {
    height: 64px;
  }
  .nav-links {
    display: none;
  }
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .content-block, .sitemap-card {
    padding: 24px 20px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
}