/* ==========================================================================
   YTOO 歪兔机场 (ytoo1.cfd) - 视觉核心 CSS 样式库
   风格：深海冷压风（Deep Oceanic）
   配色：深海蓝黑渐变、浮游生物荧光、潜水艇视界
   包含：鼠标尾翼、水下光斑、暗照声呐、玻璃拟态、PBN输血页脚
   ========================================================================== */

:root {
  /* 深海底色调 */
  --bg-abyss: #01060e;
  --bg-ocean-dark: #030d1d;
  --bg-ocean-mid: #06172d;
  --bg-ocean-surface: #0a2240;
  
  /* 深海拟态面板与边框 */
  --bg-panel: rgba(5, 21, 43, 0.68);
  --bg-panel-hover: rgba(8, 30, 59, 0.85);
  --bg-panel-solid: #061933;
  --border-cyan: rgba(0, 242, 254, 0.16);
  --border-cyan-bright: rgba(0, 242, 254, 0.45);
  --border-glow: rgba(0, 229, 255, 0.6);

  /* 浮游生物与荧光霓虹色系 */
  --neon-cyan: #00f2fe;
  --neon-teal: #00e5ff;
  --neon-plankton: #00ffc8;
  --neon-blue: #3b82f6;
  --neon-depth: #0284c7;

  /* 文字颜色 */
  --text-primary: #f0f7ff;
  --text-secondary: #93c5fd;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* 字体与基准 */
  --font-sans: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  --max-width: 1240px;

  /* 圆角与过渡 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at 50% 0%, #082142 0%, #030d1d 60%, #01060e 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  cursor: default;
}

/* 鼠标尾翼 Canvas 悬浮层 */
#cursor-trail-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* 背景浮游生物 Canvas */
#plankton-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
}

/* 容器居中 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   导航栏 Header Navbar (潜水艇观察窗风格)
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(2, 10, 22, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-cyan);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
}

.brand-badge {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, #00f2fe 0%, #0072ff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.25rem;
  color: #01060e;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
  position: relative;
}

.brand-badge::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 14px;
  border: 1px solid var(--neon-cyan);
  opacity: 0.5;
  animation: pulse-ring 3s infinite ease-in-out;
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, #ffffff 0%, var(--neon-teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-domain {
  font-size: 0.72rem;
  color: var(--neon-plankton);
  font-family: var(--font-mono);
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--neon-cyan);
  transition: var(--transition);
  box-shadow: 0 0 8px var(--neon-cyan);
}

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

.nav-cta {
  background: linear-gradient(135deg, var(--neon-cyan) 0%, #0066ff 100%);
  color: #01060e !important;
  font-weight: 700 !important;
  padding: 8px 20px !important;
  border-radius: 30px;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.35);
  transition: var(--transition) !important;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.6);
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-cyan);
  color: var(--neon-cyan);
  font-size: 1.5rem;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section - 深海视界 & 深度计
   ========================================================================== */
.hero-section {
  padding: 160px 0 90px 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-depth-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.3);
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--neon-plankton);
  font-family: var(--font-mono);
  margin-bottom: 1.5rem;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.15);
}

.sonar-dot {
  width: 8px;
  height: 8px;
  background-color: var(--neon-plankton);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--neon-plankton);
  animation: sonar-blink 1.5s infinite;
}

@keyframes sonar-blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.7); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  letter-spacing: -0.5px;
}

.hero-title span.glow-text {
  background: linear-gradient(135deg, #ffffff 0%, var(--neon-cyan) 50%, var(--neon-plankton) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 15px rgba(0, 242, 254, 0.3));
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2.2rem;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  gap: 1.2rem;
  align-items: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--neon-cyan) 0%, #0066ff 100%);
  color: #01060e;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 14px 32px;
  border-radius: 40px;
  text-decoration: none;
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.4);
  transition: var(--transition);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 45px rgba(0, 242, 254, 0.7);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(6, 25, 50, 0.8);
  color: var(--neon-cyan);
  border: 1px solid var(--border-cyan-bright);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: 40px;
  text-decoration: none;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.25);
  transform: translateY(-2px);
}

.hero-metrics {
  display: flex;
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-cyan);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-size: 1.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--neon-teal);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
}

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

/* 潜水艇声呐与窗口卡片 */
.submarine-window-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan-bright);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), inset 0 0 20px rgba(0, 242, 254, 0.05);
  position: relative;
}

.sonar-radar-box {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 360px;
  margin: 0 auto;
  border-radius: 50%;
  border: 2px solid rgba(0, 242, 254, 0.3);
  background: radial-gradient(circle, rgba(0, 242, 254, 0.05) 0%, rgba(3, 13, 29, 0.9) 70%);
  overflow: hidden;
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.15), inset 0 0 30px rgba(0, 242, 254, 0.2);
}

.radar-ring {
  position: absolute;
  inset: 15%;
  border-radius: 50%;
  border: 1px dashed rgba(0, 242, 254, 0.2);
}

.radar-ring-inner {
  position: absolute;
  inset: 35%;
  border-radius: 50%;
  border: 1px solid rgba(0, 242, 254, 0.15);
}

.radar-sweep {
  position: absolute;
  width: 50%;
  height: 50%;
  top: 0;
  right: 0;
  transform-origin: 0% 100%;
  background: conic-gradient(from 0deg, rgba(0, 242, 254, 0.4) 0deg, transparent 60deg);
  animation: radar-spin 4s linear infinite;
}

@keyframes radar-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.radar-node {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(2, 10, 22, 0.8);
  border: 1px solid var(--neon-cyan);
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--neon-plankton);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

.radar-node.hk { top: 25%; left: 15%; }
.radar-node.jp { top: 20%; right: 20%; }
.radar-node.sg { bottom: 30%; left: 20%; }
.radar-node.us { bottom: 25%; right: 15%; }

.ping-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--neon-plankton);
}

/* ==========================================================================
   通用 Section 样式与标题
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 4rem auto;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--neon-plankton);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1rem;
}

.section-title span {
  color: var(--neon-cyan);
  text-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   4大核心优势（潜水艇深海能力网格）
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.feature-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  padding: 2.2rem 1.8rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  background: var(--bg-panel-hover);
  border-color: var(--border-cyan-bright);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 242, 254, 0.15);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid var(--border-cyan-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--neon-cyan);
  margin-bottom: 1.5rem;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.2);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.8rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   价格检索 & 套餐区域 (Pricing Section)
   ========================================================================== */
.pricing-toggle-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.toggle-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.toggle-label.active {
  color: var(--neon-cyan);
}

.pricing-switch {
  position: relative;
  width: 60px;
  height: 30px;
  background: rgba(6, 25, 50, 0.9);
  border: 1px solid var(--border-cyan-bright);
  border-radius: 20px;
  cursor: pointer;
  padding: 3px;
}

.switch-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  transition: var(--transition);
}

.pricing-switch.yearly .switch-dot {
  transform: translateX(30px);
}

.discount-badge {
  background: rgba(0, 255, 200, 0.15);
  color: var(--neon-plankton);
  border: 1px solid var(--neon-plankton);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 12px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.price-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-lg);
  padding: 2.2rem 1.8rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.price-card.popular {
  background: rgba(8, 32, 64, 0.85);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.25);
  transform: translateY(-8px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--neon-cyan), #0066ff);
  color: #01060e;
  font-weight: 800;
  font-size: 0.78rem;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.price-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.price-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  min-height: 40px;
}

.price-amount-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 1.5rem;
  border-bottom: 1px dashed var(--border-cyan);
  padding-bottom: 1.5rem;
}

.currency {
  font-size: 1.2rem;
  color: var(--neon-cyan);
  font-weight: 700;
}

.amount {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
}

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

.price-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.price-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 0.9rem;
}

.price-features li span.icon-check {
  color: var(--neon-plankton);
  font-weight: bold;
}

.btn-price {
  width: 100%;
  padding: 12px;
  border-radius: 30px;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  transition: var(--transition);
  background: rgba(0, 242, 254, 0.1);
  color: var(--neon-cyan);
  border: 1px solid var(--border-cyan-bright);
}

.btn-price:hover {
  background: linear-gradient(135deg, var(--neon-cyan), #0066ff);
  color: #01060e;
  border-color: transparent;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
}

.price-card.popular .btn-price {
  background: linear-gradient(135deg, var(--neon-cyan), #0066ff);
  color: #01060e;
  border-color: transparent;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
}

/* ==========================================================================
   SEO 文章矩阵 Grid (SEO Articles Section)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.article-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-5px);
  background: var(--bg-panel-hover);
  border-color: var(--border-cyan-bright);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 242, 254, 0.15);
}

.article-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.article-tag {
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.2);
  color: var(--neon-cyan);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 3px 10px;
  border-radius: 12px;
}

.article-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 0.8rem;
}

.article-title a {
  color: #ffffff;
  text-decoration: none;
  transition: var(--transition);
}

.article-title a:hover {
  color: var(--neon-cyan);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-footer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(0, 242, 254, 0.1);
  padding-top: 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.read-more-link {
  color: var(--neon-cyan);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  text-decoration: underline;
  color: var(--neon-plankton);
}

/* ==========================================================================
   用户评价 User Testimonials
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.8rem;
}

.testimonial-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-cyan-bright);
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1rem;
}

.user-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--neon-cyan), #0055ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #01060e;
  font-size: 1.1rem;
}

.user-details h4 {
  font-size: 1rem;
  color: #fff;
}

.user-role {
  font-size: 0.78rem;
  color: var(--neon-plankton);
}

.rating-stars {
  color: #facc15;
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   常见问题 FAQ Accordion Section
   ========================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--border-cyan-bright);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
}

.faq-question {
  padding: 1.4rem 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-question h3 {
  font-size: 1.08rem;
  font-weight: 600;
  color: #ffffff;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--neon-cyan);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.4s ease;
  padding: 0 1.8rem;
  background: rgba(3, 15, 33, 0.4);
}

.faq-item.active .faq-answer {
  max-height: 350px;
  padding: 0 1.8rem 1.5rem 1.8rem;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   文章详情页 (Single Article Detail Styles)
   ========================================================================== */
.article-detail-page {
  padding: 140px 0 90px 0;
}

.article-header-area {
  max-width: 860px;
  margin: 0 auto 3rem auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--neon-cyan);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.article-main-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: 1.2rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-cyan);
  padding-bottom: 1.5rem;
}

.article-content-wrapper {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--neon-cyan);
  margin: 2.2rem 0 1rem 0;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(0, 242, 254, 0.2);
}

.article-body h3 {
  font-size: 1.28rem;
  font-weight: 600;
  color: #ffffff;
  margin: 1.8rem 0 0.8rem 0;
}

.article-body p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.2rem;
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-secondary);
}

.article-body li {
  margin-bottom: 0.6rem;
  line-height: 1.7;
}

.article-body a {
  color: var(--neon-cyan);
  text-decoration: underline;
}

.article-body a:hover {
  color: var(--neon-plankton);
}

.article-cta-box {
  background: radial-gradient(circle at 50% 50%, rgba(0, 242, 254, 0.15) 0%, rgba(5, 21, 43, 0.9) 100%);
  border: 1px solid var(--border-cyan-bright);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  margin: 3rem 0;
}

.article-cta-box h3 {
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 0.8rem;
}

.article-cta-box p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.code-block {
  background: rgba(2, 10, 22, 0.95);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-sm);
  padding: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--neon-plankton);
  overflow-x: auto;
  margin: 1.5rem 0;
}

/* ==========================================================================
   【核心任务 2：页脚 PBN 权重精准输血管道】
   小字号、低调、优雅、与深海蓝黑深度融合
   ========================================================================== */
footer.site-footer {
  background: #01060e;
  border-top: 1px solid rgba(0, 242, 254, 0.15);
  padding: 40px 0 25px 0;
  position: relative;
  z-index: 10;
}

.footer-inner {
  text-align: center;
  max-width: 1000px;
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 1.5rem;
}

.footer-brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-brand-domain {
  font-size: 0.8rem;
  color: var(--neon-plankton);
  font-family: var(--font-mono);
}

.footer-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0.5rem auto 1.8rem auto;
  line-height: 1.6;
}

/* PBN 友情链接专区 (低调、融入、小字号) */
.pbn-links-area {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.2rem;
  margin-top: 1.2rem;
}

.pbn-title {
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 1px;
  margin-bottom: 0.8rem;
  text-transform: uppercase;
}

.pbn-link-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 18px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.pbn-link-item a {
  font-size: 0.78rem;
  color: #4b6382;
  text-decoration: none;
  transition: var(--transition);
}

.pbn-link-item a:hover {
  color: var(--neon-cyan);
  text-shadow: 0 0 8px rgba(0, 242, 254, 0.4);
}

.footer-copyright {
  margin-top: 1.8rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ==========================================================================
   移动端响应式 (Mobile Responsive Layout)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }

  .hero-desc {
    margin: 0 auto 2rem auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-metrics {
    justify-content: center;
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .submarine-window-card {
    max-width: 420px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(2, 10, 22, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-cyan);
    transform: translateY(-150%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .nav-menu.mobile-open {
    transform: translateY(0);
  }

  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .article-content-wrapper {
    padding: 1.8rem 1.2rem;
  }

  .article-main-title {
    font-size: 1.7rem;
  }
}