/* ====================================================================
   仙路湾加速 - 全面 UI 视觉规范：动漫次元 · 星芒光轨 (Anime Cyber-Aether)
   深度暗夜宇宙、霓虹青与樱花粉高光、拟真磨砂玻璃、3D倾斜与原生极速性能
   ==================================================================== */

:root {
  /* 核心主题色彩：动漫暗夜星域与光轨高光 */
  --nn-bg-main: #070913;
  --nn-bg-card: rgba(15, 20, 39, 0.78);
  --nn-bg-card-hover: rgba(23, 31, 58, 0.9);
  --nn-bg-subtle: rgba(20, 27, 53, 0.65);
  
  --nn-border: rgba(99, 102, 241, 0.22);
  --nn-border-hover: rgba(56, 189, 248, 0.5);
  --nn-border-dark: rgba(129, 140, 248, 0.35);
  --nn-border-glow: rgba(56, 189, 248, 0.75);
  
  --nn-primary: #38bdf8;
  --nn-primary-hover: #7dd3fc;
  --nn-primary-light: rgba(56, 189, 248, 0.12);
  --nn-primary-border: rgba(56, 189, 248, 0.35);
  
  --nn-accent-sakura: #f472b6;
  --nn-accent-indigo: #818cf8;
  --nn-accent-purple: #c084fc;
  --nn-accent-amber: #fbbf24;
  --nn-accent-emerald: #34d399;
  
  --nn-text-main: #f8fafc;
  --nn-text-body: #cbd5e1;
  --nn-text-muted: #94a3b8;
  --nn-text-light: #64748b;
  
  /* 阴影与光晕效果 */
  --nn-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --nn-shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.45), 0 0 1px 1px rgba(99, 102, 241, 0.15);
  --nn-shadow-lg: 0 16px 36px -8px rgba(0, 0, 0, 0.6), 0 0 20px rgba(56, 189, 248, 0.15);
  --nn-shadow-glow: 0 0 25px rgba(56, 189, 248, 0.35);
  
  --nn-radius-sm: 8px;
  --nn-radius-md: 14px;
  --nn-radius-lg: 20px;
  
  --nn-font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --nn-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--nn-font-sans);
  background-color: var(--nn-bg-main);
  background-image: 
    radial-gradient(circle at 12% 18%, rgba(56, 189, 248, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 88% 22%, rgba(168, 85, 247, 0.09) 0%, transparent 48%),
    radial-gradient(circle at 50% 75%, rgba(244, 114, 182, 0.06) 0%, transparent 55%);
  background-attachment: fixed;
  color: var(--nn-text-body);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

a {
  color: var(--nn-primary);
  text-decoration: none;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover {
  color: var(--nn-primary-hover);
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
}

img, svg {
  vertical-align: middle;
}

/* 自然环境粒子特效 Canvas (浮动光蝶与灵动星屑萤火) */
.nn-ambient-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
}

.nn-container {
  width: 100%;
  max-width: 1140px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 2;
}

.nn-text-highlight {
  color: var(--nn-primary);
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

/* ====================================================================
   顶部导航 Header (吸顶玻璃拟态、霓虹徽标、动态收缩)
   ==================================================================== */
.nn-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(7, 9, 19, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--nn-border);
  transition: all 0.3s ease;
}

.nn-header.is-scrolled {
  background-color: rgba(5, 7, 15, 0.95);
  border-bottom-color: rgba(56, 189, 248, 0.3);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

.nn-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  transition: height 0.3s ease;
}

.nn-header.is-scrolled .nn-header__inner {
  height: 58px;
}

.nn-header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--nn-text-main);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: transform 0.2s ease;
}

.nn-header__brand:hover {
  transform: scale(1.02);
}

.nn-header__brand svg {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.5));
}

.nn-header__nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nn-header__link {
  color: var(--nn-text-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 4px;
  position: relative;
  transition: color 0.25s ease;
}

.nn-header__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--nn-primary), var(--nn-accent-sakura));
  transition: width 0.25s ease, left 0.25s ease;
  border-radius: 2px;
}

.nn-header__link:hover {
  color: var(--nn-text-main);
}

.nn-header__link:hover::after {
  width: 100%;
  left: 0;
}

.nn-header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff !important;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--nn-radius-sm);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.35);
  transition: all 0.25s ease;
}

.nn-header__cta:hover {
  background: linear-gradient(135deg, #0369a1, #7dd3fc);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.6);
  transform: translateY(-1px);
}

.nn-header__toggle {
  display: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--nn-border);
  padding: 8px 10px;
  border-radius: var(--nn-radius-sm);
  cursor: pointer;
  color: var(--nn-text-main);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.nn-header__toggle:hover {
  border-color: var(--nn-primary);
  background: rgba(56, 189, 248, 0.1);
}

/* ====================================================================
   按钮系统：光泽扫过、渐变流动、磁吸跟随、点击波纹反馈
   ==================================================================== */
.nn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: var(--nn-radius-md);
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease, background 0.25s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
  text-decoration: none;
  user-select: none;
}

.nn-btn:active {
  transform: scale(0.97) !important;
}

/* 主 CTA：呼吸光晕与光泽流光扫过 */
.nn-btn--primary {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 50%, #818cf8 100%);
  background-size: 200% 200%;
  color: #ffffff !important;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.15) inset;
  animation: nnBtnFlow 6s ease infinite;
}

@keyframes nnBtnFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.nn-btn--primary:hover {
  box-shadow: 0 6px 28px rgba(56, 189, 248, 0.65), 0 0 12px rgba(244, 114, 182, 0.3);
  transform: translateY(-2px);
}

.nn-btn--glow {
  animation: nnPulseGlow 3s ease-in-out infinite, nnBtnFlow 6s ease infinite;
}

@keyframes nnPulseGlow {
  0%, 100% {
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
  }
  50% {
    box-shadow: 0 6px 30px rgba(56, 189, 248, 0.65), 0 0 15px rgba(244, 114, 182, 0.35);
  }
}

/* 光泽扫过动画 (Shimmer Sheen) */
.nn-btn__shimmer {
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
  animation: nnShimmerSweep 4.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes nnShimmerSweep {
  0%, 60% {
    left: -100%;
  }
  100% {
    left: 200%;
  }
}

/* 次级按钮：磨砂玻璃质感 */
.nn-btn--secondary {
  background: var(--nn-bg-card);
  color: var(--nn-text-main) !important;
  border-color: var(--nn-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nn-btn--secondary:hover {
  background: var(--nn-bg-card-hover);
  border-color: var(--nn-border-hover);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.25);
  transform: translateY(-2px);
}

.nn-btn--glass {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
}

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

/* 点击爆发粒子容器 */
.nn-click-particle {
  position: fixed;
  pointer-events: none;
  border-radius: 50%;
  z-index: 9999;
  transform: translate(-50%, -50%);
  animation: nnParticlePop 0.65s cubic-bezier(0.1, 0.8, 0.3, 1) forwards;
}

@keyframes nnParticlePop {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx), var(--dy)) scale(0);
  }
}

/* ====================================================================
   Hero 首屏主视觉：动漫次元科技双栏与光轨领航姬
   ==================================================================== */
.nn-hero {
  position: relative;
  padding: 60px 0 72px;
  border-bottom: 1px solid var(--nn-border);
  overflow: hidden;
}

.nn-hero__glow {
  position: absolute;
  top: -100px;
  right: -50px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, rgba(168, 85, 247, 0.1) 40%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 1;
}

.nn-hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 2;
}

.nn-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--nn-primary-border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--nn-primary);
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
}

.nn-hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--nn-primary);
  box-shadow: 0 0 8px var(--nn-primary);
  animation: nnDotBlink 2s ease-in-out infinite;
}

@keyframes nnDotBlink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.nn-hero__title {
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--nn-text-main);
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #ffffff 40%, #7dd3fc 75%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.3));
}

.nn-hero__desc {
  font-size: 1.12rem;
  color: var(--nn-text-body);
  margin-bottom: 22px;
  line-height: 1.7;
}

/* 实时专线状态指示条 */
.nn-hero__live-pulse {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.86rem;
  color: var(--nn-text-muted);
  margin-bottom: 30px;
  backdrop-filter: blur(8px);
}

.nn-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--nn-accent-emerald);
  box-shadow: 0 0 10px var(--nn-accent-emerald);
  animation: nnPulseRing 1.8s cubic-bezier(0.24, 0, 0.38, 1) infinite;
}

@keyframes nnPulseRing {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.nn-pulse-divider {
  color: rgba(255, 255, 255, 0.2);
}

.nn-hero__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.nn-hero__trust-label {
  font-size: 0.84rem;
  color: var(--nn-text-muted);
  margin-bottom: 10px;
}

.nn-hero__trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.nn-hero__trust-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--nn-text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.nn-hero__trust-item svg {
  width: 16px;
  height: 16px;
  color: var(--nn-primary);
}

/* ====================================================================
   动漫次元舞台：旋转法阵、光轨领航姬立绘与全息微卡片
   ==================================================================== */
.nn-anime-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1;
  margin: 0 auto;
}

/* 旋转赛博法阵 Halo */
.nn-anime-halo {
  position: absolute;
  inset: -20px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  animation: nnHaloSpin 50s linear infinite;
}

.nn-halo-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.3));
}

@keyframes nnHaloSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* 动漫人物立绘 */
.nn-anime-character {
  position: relative;
  width: 88%;
  height: 88%;
  z-index: 2;
  filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.7));
  animation: nnCharFloat 5.5s ease-in-out infinite;
  transform-origin: center bottom;
}

@keyframes nnCharFloat {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

.nn-anime-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* 头发与衣摆微摆动动画 */
.nn-hair-sway-l {
  transform-origin: 160px 210px;
  animation: nnHairSwayL 4s ease-in-out infinite;
}

@keyframes nnHairSwayL {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-2.5deg); }
}

.nn-hair-sway-r {
  transform-origin: 300px 210px;
  animation: nnHairSwayR 4.2s ease-in-out infinite;
}

@keyframes nnHairSwayR {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(2.5deg); }
}

.nn-anime__ribbon {
  transform-origin: 230px 318px;
  animation: nnRibbonFlutter 3.2s ease-in-out infinite;
}

@keyframes nnRibbonFlutter {
  0%, 100% { transform: rotate(0deg) skewX(0deg); }
  50% { transform: rotate(3deg) skewX(2deg); }
}

.nn-beacon-led {
  animation: nnLedPulse 1.8s ease-in-out infinite;
}

@keyframes nnLedPulse {
  0%, 100% { fill: #ec4899; filter: drop-shadow(0 0 3px #ec4899); }
  50% { fill: #f472b6; filter: drop-shadow(0 0 8px #f472b6); }
}

.nn-pupil-tracker {
  transition: transform 0.08s ease-out;
}

/* 悬浮全息状态标签 Holo Tags */
.nn-holo-tag {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--nn-radius-sm);
  padding: 8px 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 12px rgba(56, 189, 248, 0.2);
  z-index: 3;
  pointer-events: none;
}

.nn-holo-tag__icon {
  font-size: 1.2rem;
}

.nn-holo-tag__label {
  font-size: 0.72rem;
  color: var(--nn-text-muted);
}

.nn-holo-tag__val {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--nn-text-main);
}

.nn-holo-tag--top {
  top: 10%;
  left: -8%;
  animation: nnHoloTag1 4.5s ease-in-out infinite;
}

@keyframes nnHoloTag1 {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.nn-holo-tag--mid {
  right: -8%;
  top: 45%;
  animation: nnHoloTag2 5s ease-in-out infinite 0.5s;
}

@keyframes nnHoloTag2 {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.nn-holo-tag--bottom {
  bottom: 6%;
  left: -4%;
  animation: nnHoloTag3 4.8s ease-in-out infinite 1s;
}

@keyframes nnHoloTag3 {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

/* ====================================================================
   区块通用与滚动展现 (Scroll Reveal)
   ==================================================================== */
.nn-section {
  padding: 76px 0;
  border-bottom: 1px solid var(--nn-border);
  position: relative;
  z-index: 2;
}

.nn-section--alt {
  background: rgba(12, 16, 33, 0.45);
}

.nn-section__header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.nn-section__title {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--nn-text-main);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff 40%, #7dd3fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nn-section__subtitle {
  font-size: 1rem;
  color: var(--nn-text-muted);
}

/* 滚动进入动画 */
.nn-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.nn-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====================================================================
   1. 功能特点 Features (3D 倾斜、鼠标局部光线跟随、动漫玻璃质感)
   ==================================================================== */
.nn-features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.nn-feature-card {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 32px;
  box-shadow: var(--nn-shadow-md);
  transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1), box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
}

/* 鼠标局部光线跟随 (Spotlight Follow) */
.nn-feature-card::before,
.nn-support-card::before,
.nn-scenario-card::before,
.nn-price-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle 240px at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(56, 189, 248, 0.12), transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.nn-feature-card:hover::before,
.nn-support-card:hover::before,
.nn-scenario-card:hover::before,
.nn-price-card:hover::before {
  opacity: 1;
}

.nn-feature-card:hover {
  border-color: var(--nn-border-hover);
  box-shadow: var(--nn-shadow-lg);
}

.nn-feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--nn-radius-sm);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--nn-primary);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

.nn-feature-card__icon svg {
  width: 24px;
  height: 24px;
}

.nn-feature-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 10px;
}

.nn-feature-card__desc {
  font-size: 0.95rem;
  color: var(--nn-text-body);
  line-height: 1.65;
}

/* ====================================================================
   2. 流媒体与 AI 支持面板 (双擎协同、霓虹矩阵)
   ==================================================================== */
.nn-support__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.nn-support-card {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 32px;
  box-shadow: var(--nn-shadow-md);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1), border-color 0.25s ease, box-shadow 0.25s ease;
}

.nn-support-card:hover {
  border-color: var(--nn-border-hover);
  box-shadow: var(--nn-shadow-lg);
}

.nn-support-card__title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 12px;
}

.nn-support-card__desc {
  font-size: 0.92rem;
  color: var(--nn-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.nn-support-card__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.nn-support-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--nn-radius-sm);
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.nn-support-item:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}

.nn-support-item svg {
  width: 22px;
  height: 22px;
  color: var(--nn-primary);
  flex-shrink: 0;
}

.nn-support-item__name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--nn-text-main);
}

.nn-support-item__status {
  font-size: 0.76rem;
  color: var(--nn-accent-emerald);
}

/* ====================================================================
   3. 链路仿真测速对比微组件 & 专线对比表格
   ==================================================================== */
.nn-ping-box {
  background: rgba(15, 20, 39, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--nn-radius-md);
  padding: 24px;
  margin-bottom: 32px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(14px);
}

.nn-ping-box__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.nn-ping-box__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--nn-text-main);
}

.nn-ping-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nn-primary);
  box-shadow: 0 0 10px var(--nn-primary);
}

.nn-ping-box__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--nn-primary);
  padding: 6px 14px;
  border-radius: var(--nn-radius-sm);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nn-ping-box__btn:hover {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--nn-primary);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.nn-ping-box__btn.is-measuring svg {
  animation: nnSpin 0.8s linear infinite;
}

@keyframes nnSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.nn-ping-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.nn-ping-card {
  padding: 18px;
  border-radius: var(--nn-radius-sm);
  position: relative;
  overflow: hidden;
}

.nn-ping-card--good {
  background: rgba(6, 78, 59, 0.25);
  border: 1px solid rgba(52, 211, 153, 0.4);
}

.nn-ping-card--bad {
  background: rgba(127, 29, 29, 0.25);
  border: 1px solid rgba(248, 113, 113, 0.4);
}

.nn-ping-card__tag {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--nn-text-muted);
  margin-bottom: 6px;
}

.nn-ping-card__val {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 10px;
}

.nn-ping-card--good .nn-ping-card__val {
  color: var(--nn-accent-emerald);
  text-shadow: 0 0 12px rgba(52, 211, 153, 0.5);
}

.nn-ping-card--bad .nn-ping-card__val {
  color: #f87171;
  text-shadow: 0 0 12px rgba(248, 113, 113, 0.5);
}

.nn-ping-card__val small {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--nn-text-muted);
}

.nn-ping-card__details {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--nn-text-muted);
  flex-wrap: wrap;
}

.nn-status-pill {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.nn-status-pill--good {
  background: rgba(52, 211, 153, 0.2);
  color: var(--nn-accent-emerald);
}

.nn-status-pill--bad {
  background: rgba(248, 113, 113, 0.2);
  color: #f87171;
}

/* 动感声波/光轨指示波形 */
.nn-ping-wave {
  height: 4px;
  margin-top: 14px;
  border-radius: 2px;
}

.nn-ping-wave--smooth {
  background: linear-gradient(90deg, #34d399, #38bdf8, #34d399);
  background-size: 200% 100%;
  animation: nnWaveFlow 2s linear infinite;
}

.nn-ping-wave--jitter {
  background: linear-gradient(90deg, #f87171, #fbbf24, #f87171);
  background-size: 200% 100%;
  animation: nnWaveFlow 0.8s steps(4) infinite;
}

@keyframes nnWaveFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* 优势对比 Benefits Table */
.nn-benefits__wrapper {
  overflow-x: auto;
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  box-shadow: var(--nn-shadow-md);
}

.nn-benefits-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.nn-benefits-table th,
.nn-benefits-table td {
  padding: 18px 22px;
  border-bottom: 1px solid var(--nn-border);
}

.nn-benefits-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--nn-text-main);
  font-weight: 700;
}

.nn-benefits-table th.nn-highlight,
.nn-benefits-table td.nn-highlight {
  color: var(--nn-primary);
  font-weight: 600;
  background: rgba(56, 189, 248, 0.06);
}

.nn-benefits-table tr:last-child td {
  border-bottom: none;
}

/* ====================================================================
   4. 使用场景卡 Scenarios (3张卡片)
   ==================================================================== */
.nn-scenarios__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.nn-scenario-card {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 28px;
  box-shadow: var(--nn-shadow-md);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1), border-color 0.25s ease, box-shadow 0.25s ease;
}

.nn-scenario-card:hover {
  border-color: var(--nn-border-hover);
  box-shadow: var(--nn-shadow-lg);
}

.nn-scenario-card__title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 8px;
}

.nn-scenario-card__devices {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--nn-primary);
  background: rgba(56, 189, 248, 0.1);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 16px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.nn-scenario-card__desc {
  font-size: 0.94rem;
  color: var(--nn-text-body);
  line-height: 1.65;
}

/* ====================================================================
   5. 定价方案 Pricing (周期平滑切换、彩虹流光边框、推荐档突出)
   ==================================================================== */
.nn-pricing-toggle {
  display: inline-flex;
  align-items: center;
  background: rgba(15, 20, 39, 0.9);
  border: 1px solid var(--nn-border);
  border-radius: 999px;
  padding: 4px;
  margin-top: 20px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.nn-pricing-toggle__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--nn-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s ease;
}

.nn-pricing-toggle__btn.is-active {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
}

.nn-pricing-toggle__badge {
  background: var(--nn-accent-sakura);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 999px;
  box-shadow: 0 0 8px rgba(244, 114, 182, 0.6);
}

.nn-pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.nn-price-card {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 36px 28px;
  box-shadow: var(--nn-shadow-md);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1), border-color 0.25s ease, box-shadow 0.25s ease;
}

.nn-price-card:hover {
  border-color: var(--nn-border-hover);
  box-shadow: var(--nn-shadow-lg);
}

/* 推荐主力版：彩虹流光霓虹边框 & 微放大 */
.nn-price-card--featured {
  background: rgba(18, 25, 52, 0.92);
  border-color: rgba(56, 189, 248, 0.6);
  box-shadow: 0 12px 36px rgba(56, 189, 248, 0.2), 0 0 0 1px rgba(56, 189, 248, 0.3);
  transform: scale(1.02);
}

.nn-price-card--featured:hover {
  box-shadow: 0 16px 45px rgba(56, 189, 248, 0.35), 0 0 0 1px var(--nn-primary);
}

.nn-price-card__badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, var(--nn-accent-sakura), #ec4899);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  box-shadow: 0 0 12px rgba(244, 114, 182, 0.6);
}

.nn-price-card__name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--nn-text-main);
  margin-bottom: 6px;
}

.nn-price-card__desc {
  font-size: 0.88rem;
  color: var(--nn-text-muted);
  margin-bottom: 22px;
}

.nn-price-card__price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--nn-border);
}

.nn-price-card__currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--nn-primary);
}

.nn-price-card__amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--nn-text-main);
  line-height: 1;
  letter-spacing: -0.03em;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nn-price-card__amount.is-animating {
  transform: scale(1.1);
  color: var(--nn-primary);
}

.nn-price-card__period {
  font-size: 0.95rem;
  color: var(--nn-text-muted);
}

.nn-price-card__features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.nn-price-card__features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--nn-text-body);
}

.nn-price-card__features li::before {
  content: "✓";
  color: var(--nn-primary);
  font-weight: 800;
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
}

/* ====================================================================
   6. 常见问题解答 FAQ (手风琴交互与高光展开)
   ==================================================================== */
.nn-faq__list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.nn-faq__item {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.nn-faq__item[open] {
  border-color: var(--nn-border-hover);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.nn-faq__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--nn-text-main);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color 0.2s ease;
}

.nn-faq__summary::-webkit-details-marker {
  display: none;
}

.nn-faq__summary:hover {
  color: var(--nn-primary);
}

.nn-faq__icon {
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--nn-primary);
  transition: transform 0.25s ease;
}

.nn-faq__item[open] .nn-faq__icon {
  transform: rotate(45deg);
}

.nn-faq__answer {
  padding: 0 24px 22px;
  font-size: 0.96rem;
  color: var(--nn-text-body);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 14px;
}

/* ====================================================================
   Final CTA 跃迁星环转化区
   ==================================================================== */
.nn-cta-banner {
  position: relative;
  padding: 90px 0;
  text-align: center;
  border-bottom: 1px solid var(--nn-border);
  overflow: hidden;
  background: radial-gradient(circle at center, rgba(30, 41, 79, 0.6) 0%, rgba(7, 9, 19, 0.95) 70%);
}

.nn-cta-banner__warp {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 500px;
  height: 500px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px dashed rgba(56, 189, 248, 0.25);
  pointer-events: none;
  animation: nnWarpRotate 40s linear infinite;
}

@keyframes nnWarpRotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.nn-cta-banner__title {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--nn-text-main);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 40%, #7dd3fc 80%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nn-cta-banner__desc {
  font-size: 1.08rem;
  color: var(--nn-text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

/* ====================================================================
   页脚 Footer
   ==================================================================== */
.nn-footer {
  background: rgba(5, 7, 15, 0.98);
  padding: 48px 0 36px;
  border-top: 1px solid var(--nn-border);
  position: relative;
  z-index: 2;
}

.nn-footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 20px;
}

.nn-footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--nn-text-main);
  font-weight: 700;
  font-size: 1.15rem;
}

.nn-footer__brand svg {
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.4));
}

.nn-footer__nav {
  display: flex;
  gap: 20px;
}

.nn-footer__nav a {
  color: var(--nn-text-muted);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.nn-footer__nav a:hover {
  color: var(--nn-primary);
}

.nn-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--nn-text-light);
  flex-wrap: wrap;
  gap: 10px;
}

/* ====================================================================
   移动端吸底 CTA 栏
   ==================================================================== */
.nn-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(7, 9, 19, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(56, 189, 248, 0.35);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.7);
  padding: 12px 20px;
  z-index: 99;
}

.nn-sticky-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 500px;
  margin: 0 auto;
}

.nn-sticky-bar__text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--nn-text-main);
}

.nn-sticky-bar__cta {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff !important;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 8px 20px;
  border-radius: var(--nn-radius-sm);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
}

/* ====================================================================
   文章页与指南中心样式支持 (保持全站动漫科技暗夜沉浸感)
   ==================================================================== */
.nn-page-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--nn-border);
  background: rgba(12, 16, 33, 0.5);
}

.nn-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--nn-text-muted);
  margin-bottom: 16px;
}

.nn-breadcrumb a {
  color: var(--nn-text-muted);
}

.nn-breadcrumb a:hover {
  color: var(--nn-primary);
}

.nn-page-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--nn-text-main);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  line-height: 1.3;
}

.nn-page-meta {
  display: flex;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--nn-text-muted);
  flex-wrap: wrap;
}

.nn-article-layout {
  padding: 48px 0 64px;
}

.nn-article-body {
  max-width: 820px;
  margin: 0 auto;
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 40px;
  box-shadow: var(--nn-shadow-md);
}

.nn-article-body p {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--nn-text-body);
  margin-bottom: 20px;
}

.nn-article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--nn-border);
}

.nn-article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--nn-text-main);
  margin-top: 24px;
  margin-bottom: 12px;
}

.nn-article-body ul,
.nn-article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.nn-article-body li {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 8px;
  color: var(--nn-text-body);
}

.nn-article-callout {
  background: rgba(56, 189, 248, 0.1);
  border-left: 4px solid var(--nn-primary);
  padding: 16px 20px;
  border-radius: 0 var(--nn-radius-sm) var(--nn-radius-sm) 0;
  margin: 28px 0;
  font-size: 0.95rem;
  color: var(--nn-text-main);
}

.nn-article-callout strong {
  color: var(--nn-primary);
}

.nn-article-cta-box {
  background: rgba(15, 20, 39, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--nn-radius-md);
  padding: 28px;
  text-align: center;
  margin: 40px 0 20px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.nn-article-cta-box__title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 8px;
}

.nn-article-cta-box__desc {
  font-size: 0.95rem;
  color: var(--nn-text-muted);
  margin-bottom: 20px;
}

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

.nn-article-links__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 12px;
}

.nn-article-links ul {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 指南中心列表页 */
.nn-guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.nn-guide-card {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 28px;
  box-shadow: var(--nn-shadow-md);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.nn-guide-card:hover {
  transform: translateY(-2px);
  border-color: var(--nn-primary);
  box-shadow: var(--nn-shadow-lg);
}

.nn-guide-card__meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--nn-text-muted);
  margin-bottom: 12px;
}

.nn-guide-card__tag {
  color: var(--nn-primary);
  font-weight: 700;
}

.nn-guide-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 10px;
  line-height: 1.4;
}

.nn-guide-card__desc {
  font-size: 0.95rem;
  color: var(--nn-text-body);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.nn-guide-card__read {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--nn-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 法律合规页 Layout */
.nn-legal-layout {
  padding: 48px 0 64px;
}

.nn-legal-card {
  max-width: 860px;
  margin: 0 auto;
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 44px;
  box-shadow: var(--nn-shadow-md);
}

.nn-legal-card h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-top: 32px;
  margin-bottom: 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--nn-border);
}

.nn-legal-card h2:first-of-type {
  margin-top: 0;
}

.nn-legal-card p {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--nn-text-body);
  margin-bottom: 16px;
}

.nn-legal-card ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

.nn-legal-card li {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--nn-text-body);
  margin-bottom: 6px;
}

/* 站点地图 Sitemap Page */
.nn-sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 32px;
}

.nn-sitemap-group {
  background: var(--nn-bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--nn-border);
  border-radius: var(--nn-radius-md);
  padding: 24px;
}

.nn-sitemap-group__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--nn-text-main);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--nn-border);
}

.nn-sitemap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nn-sitemap-list a {
  font-size: 0.95rem;
  color: var(--nn-text-body);
  display: flex;
  justify-content: space-between;
}

.nn-sitemap-list a:hover {
  color: var(--nn-primary);
}

.nn-sitemap-list span {
  font-size: 0.8rem;
  color: var(--nn-text-light);
}

/* ====================================================================
   响应式断点适配
   ==================================================================== */
@media (max-width: 992px) {
  .nn-hero__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .nn-hero__actions {
    justify-content: center;
  }
  
  .nn-hero__trust-list {
    justify-content: center;
  }
  
  .nn-anime-stage {
    margin-top: 20px;
  }
  
  .nn-features__grid,
  .nn-support__grid,
  .nn-scenarios__grid,
  .nn-pricing__grid,
  .nn-guides-grid {
    grid-template-columns: 1fr;
  }
  
  .nn-price-card--featured {
    transform: none;
  }
  
  .nn-ping-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nn-header__nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(7, 9, 19, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--nn-border);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
  }
  
  .nn-header__nav.is-open {
    display: flex;
  }
  
  .nn-header__toggle {
    display: block;
  }
  
  .nn-hero__title {
    font-size: 2.15rem;
  }
  
  .nn-hero__actions {
    flex-direction: column;
    width: 100%;
  }
  
  .nn-hero__actions .nn-btn {
    width: 100%;
  }
  
  .nn-article-body,
  .nn-legal-card {
    padding: 24px 18px;
  }
  
  .nn-footer__top {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  
  .nn-sitemap-grid {
    grid-template-columns: 1fr;
  }
}

/* ====================================================================
   性能与用户辅助功能：prefers-reduced-motion
   ==================================================================== */
@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;
  }
  
  .nn-reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  
  .nn-ambient-canvas {
    display: none !important;
  }
  
  .nn-anime-halo,
  .nn-anime-character,
  .nn-holo-tag,
  .nn-btn__shimmer {
    animation: none !important;
  }
}