/* ====================================================================
   BitzNet - 设计说明 03：机甲整备库 · 蓝图线稿 · 终端控制台
   规范：Layer 1.5 Specification + Layer 2 Performance & QA
   配色：--bg-console (#0A1218), --line-cyan (#4ECDC4), --accent-orange (#FF6B35)
   ==================================================================== */

:root {
  --bg-console: #0A1218;
  --bg-panel: #0f1c24;
  --bg-panel-light: #162732;
  --line-cyan: #4ECDC4;
  --line-dim: #2A4A52;
  --line-bright: #6ee7b7;
  --accent-orange: #FF6B35;
  --accent-orange-hover: #ff8554;
  --text-main: #D0F0F0;
  --text-muted: #6A9A9A;
  --grid: rgba(78, 205, 196, 0.08);
  --grid-line: rgba(78, 205, 196, 0.18);
  --hazard: repeating-linear-gradient(-45deg, rgba(255, 107, 53, 0.18), rgba(255, 107, 53, 0.18) 10px, transparent 10px, transparent 20px);
  --hazard-cyan: repeating-linear-gradient(-45deg, rgba(78, 205, 196, 0.12), rgba(78, 205, 196, 0.12) 8px, transparent 8px, transparent 16px);

  --nn-font: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --nn-container: 1160px;
}

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

html {
  font-family: var(--nn-font);
  background-color: var(--bg-console);
  background-image: 
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--line-cyan);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* 基础版心容器 */
.nn-container {
  width: 100%;
  max-width: var(--nn-container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 警示条纹条装与技术装饰线 */
.nn-hazard-strip {
  height: 6px;
  width: 100%;
  background: var(--hazard);
  border-bottom: 1px solid var(--line-dim);
}

.nn-tech-meta {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--nn-font);
}

/* 按钮规范：动词开头，触控目标 ≥44px，唯一撞色 accent-orange，磁吸 CTA */
.nn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--nn-font);
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  letter-spacing: 0.03em;
  position: relative;
  will-change: transform;
}

.nn-btn:hover {
  text-decoration: none;
}

.nn-btn-primary {
  background-color: var(--accent-orange);
  color: #0A1218;
  border-color: var(--accent-orange);
  box-shadow: 0 0 16px rgba(255, 107, 53, 0.35);
}

.nn-btn-primary:hover {
  background-color: var(--accent-orange-hover);
  border-color: var(--accent-orange-hover);
  color: #0A1218;
  box-shadow: 0 0 24px rgba(255, 107, 53, 0.55);
}

.nn-btn-secondary {
  background-color: rgba(42, 74, 82, 0.35);
  color: var(--line-cyan);
  border-color: var(--line-cyan);
}

.nn-btn-secondary:hover {
  background-color: rgba(78, 205, 196, 0.15);
  color: var(--text-main);
  border-color: var(--line-cyan);
}

.nn-btn-lg {
  min-height: 48px;
  padding: 13px 30px;
  font-size: 16px;
}

.nn-btn-block {
  width: 100%;
}

/* Header 整备库顶部状态栏 */
.nn-header {
  background-color: rgba(10, 18, 24, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-dim);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nn-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nn-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--line-cyan);
  min-height: 44px;
  letter-spacing: 0.04em;
}

.nn-logo:hover {
  text-decoration: none;
  color: var(--text-main);
}

.nn-logo-box {
  width: 34px;
  height: 34px;
  border: 1px solid var(--line-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(78, 205, 196, 0.1);
}

/* 顶部状态遥测指示栏 (HUD) */
.nn-hud-strip {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 11px;
  color: var(--text-muted);
  border-left: 1px solid var(--line-dim);
  border-right: 1px solid var(--line-dim);
  padding: 0 16px;
  height: 32px;
}

.nn-hud-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--line-cyan);
  box-shadow: 0 0 8px var(--line-cyan);
}

.nn-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nn-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.nn-nav a:hover,
.nn-nav a.is-active {
  color: var(--line-cyan);
  text-decoration: none;
  text-shadow: 0 0 8px rgba(78, 205, 196, 0.4);
}

.nn-header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nn-burger-btn {
  display: none;
  background: none;
  border: 1px solid var(--line-dim);
  min-height: 44px;
  min-width: 44px;
  padding: 10px;
  border-radius: 4px;
  cursor: pointer;
}

.nn-burger-btn svg {
  width: 22px;
  height: 22px;
  stroke: var(--line-cyan);
}

/* 移动端菜单抽屉 */
.nn-mobile-drawer {
  display: none;
  background-color: var(--bg-panel);
  border-bottom: 2px solid var(--line-cyan);
  padding: 20px;
}

.nn-mobile-drawer.is-open {
  display: block;
}

.nn-mobile-drawer ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.nn-mobile-drawer a {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

/* 区块公用样式 */
.nn-section {
  padding: 72px 0;
  border-bottom: 1px solid var(--line-dim);
  position: relative;
}

.nn-section:last-of-type {
  border-bottom: none;
}

.nn-section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px auto;
}

.nn-section-tag {
  display: inline-block;
  font-size: 11px;
  color: var(--line-cyan);
  border: 1px solid var(--line-dim);
  background-color: rgba(78, 205, 196, 0.06);
  padding: 2px 10px;
  margin-bottom: 12px;
  letter-spacing: 0.1em;
}

.nn-section-title {
  font-size: 26px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.nn-section-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Hero 主控制台开机画面 */
.nn-hero {
  padding: 80px 0 68px 0;
  background-color: rgba(15, 28, 36, 0.7);
  border-bottom: 1px solid var(--line-dim);
  position: relative;
}

.nn-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--line-cyan), transparent);
}

.nn-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.nn-hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--line-cyan);
  border: 1px solid var(--line-dim);
  background-color: rgba(78, 205, 196, 0.08);
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 18px;
}

.nn-hero-title {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.nn-hero-title-accent {
  color: var(--line-cyan);
  text-shadow: 0 0 16px rgba(78, 205, 196, 0.4);
}

.nn-hero-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 28px;
}

.nn-hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.nn-hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dim);
}

.nn-hero-badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.nn-hero-badge-item svg {
  width: 16px;
  height: 16px;
  color: var(--line-cyan);
}

/* Hero 控制台仪表盘卡片（蓝图线稿与尺寸标注） */
.nn-hero-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-top: 2px solid var(--line-cyan);
  border-radius: 4px;
  padding: 24px;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.nn-hero-card::after {
  content: "+";
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-size: 14px;
  color: var(--line-cyan);
  opacity: 0.6;
}

.nn-hero-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-dim);
  font-size: 12px;
  font-weight: 600;
  color: var(--line-cyan);
}

.nn-metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.nn-metric-box {
  background-color: var(--bg-console);
  border: 1px solid var(--line-dim);
  border-radius: 2px;
  padding: 12px 14px;
  position: relative;
}

.nn-metric-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
  letter-spacing: 0.04em;
}

.nn-metric-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--nn-font);
}

.nn-metric-notice {
  font-size: 12px;
  color: var(--text-muted);
  background-color: rgba(42, 74, 82, 0.25);
  border-left: 3px solid var(--line-cyan);
  padding: 10px 14px;
  line-height: 1.55;
}

/* 特性卡片（仪表盘参数区，每个特性一个实时读数） */
.nn-features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.nn-feature-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color 0.2s ease;
}

.nn-feature-card:hover {
  border-color: var(--line-cyan);
}

.nn-feature-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.nn-feature-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nn-feature-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 3px;
  background-color: rgba(78, 205, 196, 0.08);
  border: 1px solid var(--line-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--line-cyan);
  flex-shrink: 0;
}

.nn-feature-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
}

.nn-feature-gauge {
  font-size: 11px;
  font-weight: 700;
  color: var(--line-cyan);
  background-color: rgba(78, 205, 196, 0.1);
  border: 1px solid var(--line-dim);
  padding: 3px 8px;
  border-radius: 2px;
}

.nn-feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 支持服务与场景区域 (流媒体与 AI) */
.nn-tech-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 32px;
}

.nn-tech-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 28px;
}

.nn-tech-box-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nn-tech-box-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.6;
}

.nn-tag-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.nn-tag {
  background-color: var(--bg-console);
  border: 1px solid var(--line-dim);
  border-radius: 2px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--text-main);
}

/* 使用场景卡：整备阶段命令日志 */
.nn-scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.nn-scenario-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 24px 28px;
  position: relative;
}

.nn-scenario-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-dim);
}

.nn-scenario-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

.nn-scenario-device {
  font-size: 11px;
  color: var(--line-cyan);
  background-color: rgba(78, 205, 196, 0.08);
  padding: 2px 8px;
  border-radius: 2px;
  border: 1px solid var(--line-dim);
}

.nn-scenario-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 定价区：三种整备权限（基础 / 进阶[推荐] / 核心） */
.nn-pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.nn-pricing-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.nn-pricing-card.is-featured {
  border-color: var(--line-cyan);
  box-shadow: 0 0 24px rgba(78, 205, 196, 0.15);
  background-color: var(--bg-panel-light);
}

.nn-pricing-ribbon {
  position: absolute;
  top: 14px;
  right: 16px;
  background-color: rgba(78, 205, 196, 0.15);
  border: 1px solid var(--line-cyan);
  color: var(--line-cyan);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 2px;
  letter-spacing: 0.06em;
}

.nn-pricing-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.nn-pricing-target {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.nn-pricing-price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-dim);
}

.nn-pricing-price {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-main);
}

.nn-pricing-unit {
  font-size: 13px;
  color: var(--text-muted);
}

.nn-pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.nn-pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.45;
}

.nn-pricing-feature-item svg {
  width: 15px;
  height: 15px;
  color: var(--line-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

/* FAQ 手风琴：命令行系统诊断问答 */
.nn-faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.nn-faq-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  overflow: hidden;
}

.nn-faq-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 16px 20px;
  background: none;
  border: none;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--nn-font);
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
}

.nn-faq-prefix {
  color: var(--line-cyan);
  margin-right: 8px;
}

.nn-faq-btn svg {
  width: 16px;
  height: 16px;
  color: var(--line-cyan);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.nn-faq-item.is-open .nn-faq-btn svg {
  transform: rotate(180deg);
}

.nn-faq-answer {
  display: none;
  padding: 0 20px 18px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px dashed var(--line-dim);
}

.nn-faq-item.is-open .nn-faq-answer {
  display: block;
}

/* Final CTA 尾部命令启动区 */
.nn-final-cta {
  background-color: var(--bg-panel);
  border-top: 1px solid var(--line-dim);
  border-bottom: 1px solid var(--line-dim);
  padding: 72px 0;
  text-align: center;
  position: relative;
}

.nn-final-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--hazard);
}

.nn-final-cta-inner {
  max-width: 640px;
  margin: 0 auto;
}

.nn-final-cta-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
}

.nn-final-cta-desc {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 26px;
}

/* Footer 页脚：底部状态行 + 版权与版本号 + 联盟披露 */
.nn-footer {
  background-color: #070d12;
  border-top: 1px solid var(--line-dim);
  padding: 44px 0 28px 0;
  margin-top: auto;
}

.nn-footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 18px;
}

.nn-footer-status-bar {
  font-size: 11px;
  color: var(--line-cyan);
  border: 1px solid var(--line-dim);
  padding: 4px 14px;
  background-color: rgba(78, 205, 196, 0.05);
}

.nn-footer-legal-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  list-style: none;
}

.nn-footer-legal-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  color: var(--text-muted);
}

.nn-footer-legal-nav a:hover {
  color: var(--line-cyan);
  text-decoration: underline;
}

.nn-footer-disclosure {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.nn-footer-copy {
  font-size: 12px;
  color: var(--text-muted);
}

/* 移动端吸底 CTA 栏 */
.nn-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--bg-panel);
  border-top: 1px solid var(--line-cyan);
  padding: 10px 16px;
  z-index: 99;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.6);
}

.nn-sticky-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.nn-sticky-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

/* ====================================================================
   内页与 SEO 文章排版规范 (Articles & Subpages)
   ==================================================================== */
.nn-page-header {
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--line-dim);
  padding: 48px 0;
  position: relative;
}

.nn-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.nn-breadcrumb a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--line-cyan);
}

.nn-page-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 12px;
}

.nn-page-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

.nn-article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding: 48px 0;
}

.nn-article-sidebar {
  display: flex;
  flex-direction: column;
}

.nn-article-body {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 40px;
}

.nn-article-lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-main);
  background-color: rgba(78, 205, 196, 0.06);
  border-left: 3px solid var(--line-cyan);
  padding: 16px 20px;
  border-radius: 0 4px 4px 0;
  margin-bottom: 32px;
}

.nn-prose h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-main);
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-dim);
}

.nn-prose h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--line-cyan);
  margin: 24px 0 12px 0;
}

.nn-prose p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 18px;
}

.nn-prose ul, .nn-prose ol {
  margin: 0 0 20px 24px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.75;
}

.nn-prose li {
  margin-bottom: 6px;
}

.nn-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 13px;
}

.nn-prose th, .nn-prose td {
  border: 1px solid var(--line-dim);
  padding: 10px 14px;
  text-align: left;
}

.nn-prose th {
  background-color: rgba(78, 205, 196, 0.08);
  font-weight: 600;
  color: var(--line-cyan);
}

.nn-prose td {
  color: var(--text-main);
}

.nn-prose code {
  background-color: #070d12;
  border: 1px solid var(--line-dim);
  border-radius: 2px;
  padding: 2px 6px;
  font-size: 13px;
  color: var(--line-cyan);
}

.nn-prose pre {
  background-color: #070d12;
  border: 1px solid var(--line-dim);
  color: var(--text-main);
  padding: 16px 20px;
  border-radius: 4px;
  overflow-x: auto;
  margin: 20px 0;
  font-size: 13px;
}

.nn-article-cta-box {
  background-color: rgba(255, 107, 53, 0.06);
  border: 1px solid var(--accent-orange);
  border-radius: 4px;
  padding: 24px;
  margin: 36px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nn-article-cta-content h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.nn-article-cta-content p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0;
}

.nn-related-links-box {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dim);
}

.nn-related-links-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.nn-related-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nn-related-links-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--line-cyan);
}

.nn-related-links-list a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* 侧边栏 */
.nn-sidebar-widget {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 24px;
  margin-bottom: 24px;
}

.nn-widget-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-dim);
}

.nn-widget-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nn-widget-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.45;
}

.nn-widget-list a:hover {
  color: var(--line-cyan);
}

/* 指南中心卡片流与缩略图 */
.nn-guides-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.nn-guide-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease;
}

.nn-guide-card:hover {
  border-color: var(--line-cyan);
}

.nn-guide-thumb {
  width: 100%;
  height: 130px;
  background-color: var(--bg-console);
  border: 1px solid var(--line-dim);
  border-radius: 2px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.nn-guide-thumb svg {
  width: 100%;
  height: 100%;
}

.nn-guide-tag {
  font-size: 11px;
  font-weight: 700;
  color: var(--line-cyan);
  background-color: rgba(78, 205, 196, 0.08);
  border: 1px solid var(--line-dim);
  padding: 2px 8px;
  border-radius: 2px;
  align-self: flex-start;
  margin-bottom: 10px;
}

.nn-guide-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 8px;
}

.nn-guide-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.nn-guide-footer {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line-dim);
  padding-top: 10px;
}

.nn-guide-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

/* 网站地图样式 */
.nn-sitemap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  padding: 40px 0;
}

.nn-sitemap-section {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dim);
  border-radius: 4px;
  padding: 24px;
}

.nn-sitemap-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--line-cyan);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-dim);
}

.nn-sitemap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nn-sitemap-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--text-main);
}

/* ====================================================================
   响应式断点规范
   ==================================================================== */
@media (max-width: 992px) {
  .nn-hud-strip {
    display: none;
  }
  .nn-hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .nn-features-grid,
  .nn-tech-matrix,
  .nn-scenarios-grid {
    grid-template-columns: 1fr;
  }
  .nn-pricing-grid {
    grid-template-columns: 1fr;
  }
  .nn-guides-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nn-article-layout {
    grid-template-columns: 1fr;
  }
  .nn-sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nn-nav {
    display: none;
  }
  .nn-burger-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .nn-hero-title {
    font-size: 28px;
  }
  .nn-section-title {
    font-size: 22px;
  }
  .nn-hero-cta {
    flex-direction: column;
    align-items: stretch;
  }
  .nn-sticky-bar {
    display: block;
  }
  .nn-guides-grid {
    grid-template-columns: 1fr;
  }
  .nn-article-body {
    padding: 24px 18px;
  }
  .nn-article-cta-box {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
  .nn-footer-legal-nav {
    flex-direction: column;
    gap: 8px;
  }
}