/* ==========================================================================
   飞鸟云 (Feiniao Cloud) - 高性能纯原生 CSS 样式表 (Midnight Emerald 典藏主题)
   设计规范：专业级现代 Web 视觉、高辨识度实体感按钮、明晰导航分割线、流体渐入动效
   ========================================================================== */

:root {
  /* Midnight Emerald 色彩系统 */
  --bg-primary: #071010;
  --bg-secondary: #0b1816;
  --bg-card: rgba(13, 27, 25, 0.72);
  --bg-card-hover: rgba(20, 41, 38, 0.88);
  --bg-nav: rgba(7, 16, 16, 0.88);
  
  /* 品牌核心主色 */
  --primary: #10b981;          /* Cyber Mint */
  --primary-light: #34d399;    /* Bright Mint */
  --primary-dark: #059669;     /* Deep Emerald */
  --accent-teal: #06b6d4;      /* Radiant Teal */
  --accent-cyan: #22d3ee;      /* Electric Cyan */
  --accent-amber: #f59e0b;     /* High-contrast Warm Gold */
  
  /* 渐变组合 */
  --btn-primary-gradient: linear-gradient(135deg, #10b981 0%, #059669 60%, #0d9488 100%);
  --btn-primary-hover: linear-gradient(135deg, #34d399 0%, #10b981 60%, #059669 100%);
  --badge-glow-gradient: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  --hero-text-gradient: linear-gradient(135deg, #ffffff 20%, #34d399 60%, #22d3ee 100%);
  
  /* 边框与阴影 */
  --border-subtle: rgba(16, 185, 129, 0.16);
  --border-strong: rgba(16, 185, 129, 0.35);
  --border-nav: 2px solid rgba(16, 185, 129, 0.28);
  --shadow-btn: 0 4px 14px rgba(16, 185, 129, 0.35), 0 1px 2px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  --shadow-btn-hover: 0 6px 22px rgba(16, 185, 129, 0.55), 0 2px 4px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  --shadow-card: 0 12px 36px -8px rgba(0, 0, 0, 0.65), 0 0 20px rgba(16, 185, 129, 0.05);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.2);
  
  /* 文字层级 */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  /* 容器与圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --container-max: 1200px;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 12% 15%, rgba(16, 185, 129, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 88% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(16, 185, 129, 0.08) 0%, transparent 45%);
  background-attachment: fixed;
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ==========================================================================
   导航栏 (Navbar) - 清晰的分界线与高质感粘性悬浮
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: var(--border-nav);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.7), 0 2px 0 rgba(6, 182, 212, 0.18);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

/* 品牌 Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  transition: var(--transition);
}

.brand-logo:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.brand-logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 10px rgba(16, 185, 129, 0.6));
}

.brand-name-highlight {
  background: linear-gradient(135deg, #ffffff 40%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.75rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.925rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--primary-light);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary-light);
  box-shadow: 0 0 8px var(--primary-light);
  transition: width 0.25s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* 导航操作区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   按钮系统规范 (Distinct Button Affordance)
   极高辨识度的视觉实体感：微立体厚度、高对比外框、点击反馈
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0.72rem 1.45rem;
  font-size: 0.935rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

/* 主行动按钮 (Primary CTA) */
.btn-primary {
  background: var(--btn-primary-gradient);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: var(--shadow-btn);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: skewX(-20deg);
  transition: 0.6s ease;
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  box-shadow: var(--shadow-btn-hover);
  transform: translateY(-2px);
}

.btn-primary:hover::after {
  left: 140%;
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.4), inset 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* 次要/幽灵按钮 (Ghost/Secondary CTA) - 强化实体边界 */
.btn-ghost {
  color: var(--text-main);
  background: rgba(16, 185, 129, 0.08);
  border: 1.5px solid rgba(16, 185, 129, 0.4);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.btn-ghost:hover {
  background: rgba(16, 185, 129, 0.18);
  border-color: var(--primary-light);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.25);
  transform: translateY(-2px);
}

.btn-ghost:active {
  transform: translateY(1px);
  background: rgba(16, 185, 129, 0.25);
}

/* 大型按钮 */
.btn-lg {
  padding: 0.92rem 2.15rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* 汉堡按钮 */
.menu-toggle {
  display: none;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  transition: var(--transition);
}

.menu-toggle:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--primary-light);
}

/* ==========================================================================
   首屏横幅区 (Hero Section) - 双列布局与动画矢量艺术展示
   ========================================================================== */
.hero {
  padding-top: 140px;
  padding-bottom: 90px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  text-align: left;
}

.badge-promo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fbbf24;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 1.75rem;
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.18);
  animation: pulse-glow-amber 3s infinite ease-in-out;
}

@keyframes pulse-glow-amber {
  0%, 100% { border-color: rgba(245, 158, 11, 0.4); box-shadow: 0 0 16px rgba(245, 158, 11, 0.18); }
  50% { border-color: rgba(245, 158, 11, 0.75); box-shadow: 0 0 28px rgba(245, 158, 11, 0.35); }
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-title .gradient-text {
  background: var(--hero-text-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.875rem;
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.trust-item svg {
  color: var(--primary-light);
}

/* ==========================================================================
   Hero 右侧动态矢量艺术组件 (Animated Hero Vector Art - Transparent BG)
   展示核心卖点：IPLC 28ms 延迟、1.2Gbps 满血、零日志加密、4K/AI 原生解锁
   ========================================================================== */
.hero-art-wrapper {
  position: relative;
  width: 100%;
  max-width: 500px;
  height: 440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

/* 核心雷达与发光轨道 */
.art-radar-core {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px dashed rgba(16, 185, 129, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rotate-radar 30s linear infinite;
}

.art-radar-inner {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 1px solid rgba(6, 182, 212, 0.35);
  box-shadow: 0 0 35px rgba(16, 185, 129, 0.15), inset 0 0 30px rgba(6, 182, 212, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rotate-reverse 20s linear infinite;
}

@keyframes rotate-radar {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes rotate-reverse {
  0% { transform: rotate(360deg); }
  100% { transform: rotate(0deg); }
}

.art-center-logo {
  position: relative;
  z-index: 5;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.3) 0%, rgba(9, 19, 18, 0.95) 75%);
  border: 2px solid var(--primary-light);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: pulse-core 4s ease-in-out infinite;
}

.art-center-logo svg {
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 0 12px #34d399);
}

@keyframes pulse-core {
  0%, 100% { transform: scale(1); box-shadow: 0 0 25px rgba(16, 185, 129, 0.4); }
  50% { transform: scale(1.06); box-shadow: 0 0 45px rgba(52, 211, 153, 0.7); }
}

/* 漂浮营销卖点标签卡片 (Floating Marketing HUD Cards) */
.hud-card {
  position: absolute;
  z-index: 10;
  background: rgba(13, 27, 25, 0.92);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 0 16px rgba(16, 185, 129, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  white-space: nowrap;
}

.hud-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(16, 185, 129, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-light);
  flex-shrink: 0;
}

.hud-title {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.2;
}

.hud-val {
  font-size: 0.95rem;
  font-weight: 800;
  color: #ffffff;
}

/* 位置与流体微悬浮动效 */
.hud-pos-1 {
  top: 25px;
  left: 10px;
  animation: float-badge-1 5s ease-in-out infinite;
}

.hud-pos-2 {
  top: 40px;
  right: 5px;
  animation: float-badge-2 6s ease-in-out infinite 0.5s;
}

.hud-pos-3 {
  bottom: 45px;
  left: 0px;
  animation: float-badge-3 5.5s ease-in-out infinite 1s;
}

.hud-pos-4 {
  bottom: 25px;
  right: 15px;
  animation: float-badge-4 6.5s ease-in-out infinite 1.5s;
}

@keyframes float-badge-1 {
  0%, 100% { transform: translateY(0px) rotate(-1deg); }
  50% { transform: translateY(-10px) rotate(1deg); }
}

@keyframes float-badge-2 {
  0%, 100% { transform: translateY(0px) rotate(1deg); }
  50% { transform: translateY(-12px) rotate(-1deg); }
}

@keyframes float-badge-3 {
  0%, 100% { transform: translateY(0px) rotate(-1deg); }
  50% { transform: translateY(10px) rotate(1deg); }
}

@keyframes float-badge-4 {
  0%, 100% { transform: translateY(0px) rotate(1deg); }
  50% { transform: translateY(12px) rotate(-1deg); }
}

/* ==========================================================================
   渐入淡出动效系统 (Fade-In Scroll Animation System)
   ========================================================================== */
.fade-in-section {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1), transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.fade-in-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 通用区块排版 */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 52px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-light);
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 0.85rem;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 核心优势图卡区 (Dynamic Cards) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.adv-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.adv-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--primary-light);
}

.adv-icon-wrapper svg {
  width: 28px;
  height: 28px;
}

.adv-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: #fff;
}

.adv-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 */
.media-ai-card {
  background: linear-gradient(135deg, rgba(16, 36, 33, 0.85) 0%, rgba(9, 19, 18, 0.95) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 2.75rem;
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 40px;
  align-items: center;
  box-shadow: var(--shadow-card);
}

.media-ai-content h3 {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 0.85rem;
}

.media-ai-content p {
  color: var(--text-muted);
  font-size: 0.975rem;
  line-height: 1.7;
  margin-bottom: 1.35rem;
}

.service-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.badge-item:hover {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--primary-light);
}

.badge-item span.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary-light);
  box-shadow: 0 0 6px var(--primary-light);
}

.media-ai-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.stat-box {
  background: rgba(7, 16, 16, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  text-align: center;
  transition: var(--transition);
}

.stat-box:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--primary-light);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   定价卡片区 (Pricing Section)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-strong);
}

.pricing-card.popular {
  border: 2px solid var(--primary-light);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.18) 0%, rgba(11, 24, 22, 0.95) 100%);
  box-shadow: 0 0 40px rgba(16, 185, 129, 0.25);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--btn-primary-gradient);
  color: #fff;
  font-size: 0.825rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.5);
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.plan-header {
  margin-bottom: 1.5rem;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.price-amount {
  font-size: 3.1rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.plan-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-muted);
}

.plan-features li svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--primary-light);
}

.plan-features li.strong-item {
  color: #fff;
  font-weight: 600;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   支持平台与下载专区 (Supported Platforms)
   ========================================================================== */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.platform-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
}

.platform-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--primary-light);
  border: 1px solid var(--border-subtle);
}

.platform-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.platform-clients {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  min-height: 42px;
  line-height: 1.5;
}

.platform-card .btn {
  width: 100%;
}

/* ==========================================================================
   深度特性解析区 (Why Choose Feiniao Cloud)
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.why-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: var(--transition);
  display: flex;
  gap: 20px;
}

.why-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.why-card-icon {
  font-size: 2.4rem;
  line-height: 1;
  flex-shrink: 0;
}

.why-card-content h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.why-card-content p {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   用户评价跑马灯区 (Testimonials Marquee)
   ========================================================================== */
.marquee-wrapper {
  overflow: hidden;
  position: relative;
  width: 100%;
  padding: 20px 0;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent);
}

.marquee-track {
  display: flex;
  gap: 20px;
  width: max-content;
  animation: scroll-marquee 40s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes scroll-marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(calc(-50% - 10px)); }
}

.review-card {
  width: 350px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.65rem;
  flex-shrink: 0;
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.reviewer-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
}

.review-stars {
  color: #fbbf24;
  letter-spacing: 2px;
  font-size: 0.85rem;
}

.review-text {
  font-size: 0.885rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.review-tag {
  display: inline-block;
  margin-top: 0.85rem;
  font-size: 0.75rem;
  color: var(--primary-light);
  background: rgba(16, 185, 129, 0.1);
  padding: 3px 10px;
  border-radius: 4px;
}

/* ==========================================================================
   常见问题解答区 (FAQ Section)
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--border-strong);
  background: rgba(18, 38, 35, 0.85);
}

.faq-question {
  padding: 1.35rem 1.65rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon-arrow {
  transition: transform 0.25s ease;
  color: var(--text-dim);
}

.faq-item[open] .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary-light);
}

.faq-answer {
  padding: 0 1.65rem 1.45rem 1.65rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(16, 185, 129, 0.1);
  padding-top: 1.15rem;
}

/* ==========================================================================
   底部转化区 (Bottom CTA Section)
   ========================================================================== */
.bottom-cta {
  padding: 95px 0;
  position: relative;
  text-align: center;
}

.bottom-cta-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(6, 182, 212, 0.15) 50%, rgba(9, 19, 18, 0.95) 100%);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 4.5rem 2.5rem;
  max-width: 980px;
  margin: 0 auto;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), 0 0 50px rgba(16, 185, 129, 0.2);
  position: relative;
  overflow: hidden;
}

.bottom-cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1.15rem;
  letter-spacing: -0.02em;
}

.bottom-cta-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2.5rem auto;
  line-height: 1.75;
}

.bottom-cta-btn-wrap {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.footer {
  border-top: 2px solid rgba(16, 185, 129, 0.25);
  background: #040909;
  padding: 55px 0 35px 0;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand-summary {
  max-width: 440px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

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

.footer-nav-link {
  text-decoration: none;
  color: var(--text-muted);
  transition: var(--transition);
  font-weight: 600;
}

.footer-nav-link:hover {
  color: var(--primary-light);
}

.footer-bottom {
  padding-top: 25px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.825rem;
}

/* 独立子页通用排版 (about, terms, privacy, sitemap) */
.subpage-header {
  padding: 135px 0 50px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(11, 24, 22, 0.5);
}

.subpage-body {
  padding: 60px 0 100px 0;
  max-width: 860px;
  margin: 0 auto;
}

.legal-article h2 {
  font-size: 1.5rem;
  color: #fff;
  margin: 2.5rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-article p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1.25rem;
  font-size: 0.975rem;
}

.legal-article ul {
  margin-left: 1.5rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.legal-article li {
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   响应式媒体查询 (Responsive Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    text-align: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-trust-bar {
    justify-content: center;
  }
  .hero-art-wrapper {
    margin-top: 20px;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  /* 移动端菜单激活状态 */
  .navbar.mobile-active .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 74px;
    left: 0;
    width: 100%;
    background: #071010;
    border-bottom: var(--border-nav);
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.8);
  }

  .navbar.mobile-active .nav-actions {
    display: flex;
    position: absolute;
    top: 375px;
    left: 0;
    width: 100%;
    background: #071010;
    padding: 0 1.5rem 1.5rem 1.5rem;
    flex-direction: column;
    gap: 12px;
  }

  .hero {
    padding-top: 110px;
    padding-bottom: 50px;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .hero-art-wrapper {
    height: 380px;
    max-width: 360px;
  }

  .art-radar-core {
    width: 260px;
    height: 260px;
  }

  .art-radar-inner {
    width: 180px;
    height: 180px;
  }

  .hud-card {
    padding: 8px 12px;
  }

  .hud-val {
    font-size: 0.85rem;
  }

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .media-ai-card {
    grid-template-columns: 1fr;
    padding: 1.85rem;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .platforms-grid {
    grid-template-columns: 1fr;
  }

  .why-grid {
    grid-template-columns: 1fr;
  }

  .bottom-cta-box {
    padding: 2.75rem 1.5rem;
  }

  .bottom-cta-title {
    font-size: 1.85rem;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 16px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ==========================================================================
   推荐资讯 (Article Hub) & 文章详情页专用排版样式
   ========================================================================== */

/* 面包屑导航 (Breadcrumb Navigation) */
.breadcrumb {
  padding: 18px 0;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.breadcrumb-item a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

.breadcrumb-separator {
  color: var(--text-dim);
  user-select: none;
}

.breadcrumb-item.active {
  color: var(--primary-light);
  font-weight: 600;
}

/* 资讯中心 Hub 头部与 3 列网格 */
.hub-hero {
  padding: 130px 0 50px 0;
  text-align: center;
  background: radial-gradient(circle at 50% 10%, rgba(16, 185, 129, 0.12) 0%, transparent 60%);
  border-bottom: 1px solid var(--border-subtle);
}

.hub-hero h1 {
  font-size: 2.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.hub-hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.7;
}

.article-hub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  padding: 60px 0 100px 0;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.article-card-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.775rem;
  font-weight: 700;
  color: var(--primary-light);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  color: #fff;
  margin-bottom: 0.75rem;
  transition: var(--transition);
}

.article-card:hover .article-card-title {
  color: var(--primary-light);
}

.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1rem;
}

/* 文章详情页主体排版 (Article Reader Layout) */
.article-detail-wrap {
  padding: 120px 0 80px 0;
}

.article-container {
  max-width: 880px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-main-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  color: #fff;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.author-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: #fff;
}

.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--btn-primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #fff;
  font-weight: 800;
}

/* 目录引导盒 (Table of Contents) */
.article-toc {
  background: rgba(13, 27, 25, 0.9);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin-bottom: 2.75rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.article-toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.article-toc-list li a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.925rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-toc-list li a:hover {
  color: var(--primary-light);
  transform: translateX(3px);
}

/* 文章正文 Typography */
.article-prose {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-prose h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: #fff;
  margin: 3rem 0 1.25rem 0;
  padding-left: 12px;
  border-left: 4px solid var(--primary-light);
  scroll-margin-top: 95px;
}

.article-prose h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 2rem 0 0.85rem 0;
  scroll-margin-top: 95px;
}

.article-prose p {
  margin-bottom: 1.45rem;
}

.article-prose ul, .article-prose ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.article-prose li {
  margin-bottom: 0.6rem;
}

.article-prose strong {
  color: #ffffff;
  font-weight: 700;
}

/* 提示与引用区块 */
.callout-box {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-left: 4px solid var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  color: #e2e8f0;
  font-size: 0.975rem;
}

.callout-box.tip {
  border-left-color: var(--primary-light);
}

.callout-box.warning {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.3);
  border-left-color: var(--accent-amber);
}

/* 外部权威信源引用 */
.external-citation {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--accent-teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
  transition: var(--transition);
}

.external-citation:hover {
  color: var(--accent-cyan);
}

/* 比较表格样式 */
.article-table-wrap {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
}

.article-table th {
  background: rgba(16, 185, 129, 0.15);
  color: #fff;
  padding: 12px 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

.article-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: #fff;
}

/* 正文内转化横幅 */
.article-cta-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.18) 0%, rgba(9, 19, 18, 0.95) 100%);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  margin: 3.5rem 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.75rem;
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 1.5rem auto;
  font-size: 0.95rem;
}

/* 作者专栏名片 (E-E-A-T Signal) */
.author-bio-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-top: 3.5rem;
  display: flex;
  align-items: center;
  gap: 20px;
}

.author-bio-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--btn-primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
}

.author-bio-info h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.author-bio-info p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 资讯网格响应式适配 */
@media (max-width: 1024px) {
  .article-hub-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .article-hub-grid {
    grid-template-columns: 1fr;
  }
  .article-main-title {
    font-size: 1.85rem;
  }
  .author-bio-card {
    flex-direction: column;
    text-align: center;
  }
}