/* ==========================================================================
   锦云 JinYun - 赛博科技视觉样式库
   主题设计：电路锦网 + 神经锦光 + 赛博科技
   配色规范：主背景 #020617 | 主色 #06B6D4 电路青 | 次色 #A855F7 神经紫
   字体规范：大标题 JetBrains Mono 700 | 正文 思源黑体 / Inter
   ========================================================================== */

:root {
  /* 基础色盘 */
  --bg-primary: #020617;
  --bg-secondary: #0b1120;
  --bg-card: rgba(11, 17, 32, 0.78);
  --bg-card-hover: rgba(15, 23, 42, 0.92);
  
  --color-cyan: #06B6D4;
  --color-purple: #A855F7;
  
  --border-color: rgba(6, 182, 212, 0.22);
  --border-purple: rgba(168, 85, 247, 0.3);
  --border-active: #06B6D4;

  --text-main: #FFFFFF;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-dim: rgba(255, 255, 255, 0.5);

  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --radius-btn: 4px;
  --radius-card: 12px;

  --glow-cyan: 0 0 20px rgba(6, 182, 212, 0.45);
  --glow-purple: 0 0 20px rgba(168, 85, 247, 0.45);
  --glow-text: 0 0 12px rgba(6, 182, 212, 0.8), 0 0 30px rgba(6, 182, 212, 0.4);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-primary);
}

/* ==========================================================================
   全屏电路背景与动态光晕层 (PCB Traces + Grid + Breathing Glow)
   ========================================================================== */

.cyber-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 细网格层（带径向渐变遮罩让边缘渐隐） */
.cyber-grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(6, 182, 212, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.08) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-mask-image: radial-gradient(ellipse 85% 65% at 50% 35%, black 40%, transparent 85%);
  mask-image: radial-gradient(ellipse 85% 65% at 50% 35%, black 40%, transparent 85%);
  opacity: 0.85;
}

/* 两个青/紫大型 blur 光晕缓慢呼吸缩放 */
.glow-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(140px);
}

.glow-orb-cyan {
  top: 5%;
  left: 10%;
  width: 480px;
  height: 480px;
  background: var(--color-cyan);
  opacity: 0.22;
  animation: orb-breath-1 8s ease-in-out infinite alternate;
}

.glow-orb-purple {
  top: 30%;
  right: 8%;
  width: 520px;
  height: 520px;
  background: var(--color-purple);
  opacity: 0.20;
  animation: orb-breath-2 10s ease-in-out infinite alternate;
}

@keyframes orb-breath-1 {
  0% { transform: scale(0.85) translate(0, 0); opacity: 0.16; }
  100% { transform: scale(1.15) translate(40px, 30px); opacity: 0.26; }
}

@keyframes orb-breath-2 {
  0% { transform: scale(1.15) translate(0, 0); opacity: 0.24; }
  100% { transform: scale(0.85) translate(-40px, -20px); opacity: 0.15; }
}

/* 全屏 PCB 走线 SVG（3条横向多段折线路径 + 节点脉冲发光） */
.pcb-circuit-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.85;
}

/* 走线流动动画模拟电路信号 (4-8 秒一周期) */
.pcb-line {
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.pcb-line-cyan-1 {
  stroke: var(--color-cyan);
  stroke-dasharray: 40 180;
  animation: pcb-flow 5s linear infinite;
}

.pcb-line-purple {
  stroke: var(--color-purple);
  stroke-dasharray: 50 200;
  animation: pcb-flow 7s linear infinite reverse;
}

.pcb-line-cyan-2 {
  stroke: var(--color-cyan);
  stroke-dasharray: 60 220;
  animation: pcb-flow 6s linear infinite;
}

@keyframes pcb-flow {
  0% { stroke-dashoffset: 800; }
  100% { stroke-dashoffset: 0; }
}

/* 电路底线 (静态微弱衬底) */
.pcb-line-base-cyan {
  stroke: rgba(6, 182, 212, 0.15);
  stroke-width: 1;
}

.pcb-line-base-purple {
  stroke: rgba(168, 85, 247, 0.15);
  stroke-width: 1;
}

/* 路径交汇发光节点脉冲 */
.pcb-node {
  fill: #ffffff;
  transform-origin: center;
  animation: node-pulse 2s infinite ease-in-out;
}

.pcb-node-cyan {
  filter: drop-shadow(0 0 6px var(--color-cyan));
}

.pcb-node-purple {
  filter: drop-shadow(0 0 6px var(--color-purple));
  animation-delay: 1s;
}

@keyframes node-pulse {
  0%, 100% { r: 2.5; opacity: 0.5; }
  50% { r: 4.5; opacity: 1; }
}

/* ==========================================================================
   页面容器与布局结构 (维持现有结构与组件不变)
   ========================================================================== */

.page-wrapper {
  position: relative;
  z-index: 1;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 84px 0;
  position: relative;
}

/* ==========================================================================
   CTA 按钮规范：青色描边无填充，hover 填充青色+字变黑，圆角 4px，等宽字体
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius-btn);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  outline: none;
  transition: all 0.22s ease-in-out;
  white-space: nowrap;
  user-select: none;
  min-height: 46px;
}

/* 主 CTA：青色描边无填充，hover 填充青色 + 文字变黑 */
.btn-primary {
  background: transparent;
  color: var(--color-cyan);
  border: 1px solid var(--color-cyan);
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.25);
}

.btn-primary:hover {
  background: var(--color-cyan);
  color: #020617;
  box-shadow: 0 0 24px rgba(6, 182, 212, 0.65);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

/* 次级按钮：紫色或半透明描边，hover 时紫色发光 */
.btn-secondary {
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-secondary:hover {
  border-color: var(--color-purple);
  color: var(--color-purple);
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.4);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
  min-height: 38px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   页眉导航 Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  color: #FFFFFF;
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid var(--color-cyan);
  border-radius: var(--radius-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  box-shadow: 0 0 14px rgba(6, 182, 212, 0.35);
}

.logo-text span {
  color: var(--color-cyan);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s;
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-cyan);
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.mobile-menu-toggle {
  display: none;
}

.menu-toggle-label {
  display: none;
  cursor: pointer;
  padding: 6px;
  color: #FFFFFF;
}

/* ==========================================================================
   主视觉区 (Hero Section)：左侧大标题 + 右侧 340×340 神经网络锦鲤核心
   ========================================================================== */

.hero-section {
  padding: 80px 0 60px;
  position: relative;
}

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

/* 左侧内容 */
.hero-content-left {
  text-align: left;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.badge-tag.pulse::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background-color: var(--color-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-cyan);
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.3); opacity: 1; }
}

/* H1「锦云」使用 JetBrains Mono 等宽字体，文字带青色发光阴影 */
.hero-title {
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  color: #FFFFFF;
}

.hero-title-brand {
  color: #FFFFFF;
  text-shadow: 0 0 12px var(--color-cyan), 0 0 28px rgba(6, 182, 212, 0.7), 0 0 50px rgba(6, 182, 212, 0.35);
}

.hero-title-sub {
  display: block;
  font-size: 28px;
  margin-top: 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  background: linear-gradient(135deg, #FFFFFF 0%, var(--color-cyan) 60%, var(--color-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 简介 */
.hero-subtitle {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-dim);
  margin-bottom: 34px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

/* 指标条 */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  backdrop-filter: blur(12px);
}

.stat-item {
  text-align: center;
  padding: 4px 8px;
  border-right: 1px solid var(--border-color);
}

.stat-item:last-child {
  border-right: none;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 800;
  color: #FFFFFF;
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
  margin-bottom: 2px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-dim);
}

/* ==========================================================================
   右侧 340×340px 神经网络核心动画 (多层多边形连线 + 2层虚线圆轨道 + 锦鲤)
   ========================================================================== */

.hero-visual-right {
  display: flex;
  justify-content: center;
  align-items: center;
}

.neural-core-wrapper {
  position: relative;
  width: 340px;
  height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 4个角落叠加等宽字体数据标签 */
.core-tag {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-cyan);
  text-shadow: 0 0 8px rgba(6, 182, 212, 0.6);
  letter-spacing: 0.5px;
  pointer-events: none;
  z-index: 5;
}

.tag-tl { top: 0; left: 0; }
.tag-tr { top: 0; right: 0; color: var(--color-purple); text-shadow: 0 0 8px rgba(168, 85, 247, 0.6); }
.tag-bl { bottom: 0; left: 0; }
.tag-br { bottom: 0; right: 0; color: #10B981; text-shadow: 0 0 8px rgba(16, 185, 129, 0.6); }

/* 神经网络连线 SVG 容器 */
.neural-svg-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 340px;
  height: 340px;
  pointer-events: none;
}

/* 2层虚线圆轨道 (青/紫反向旋转) */
.orbit-track-cyan {
  transform-origin: 170px 170px;
  animation: orbit-rotate-cw 20s linear infinite;
}

.orbit-track-purple {
  transform-origin: 170px 170px;
  animation: orbit-rotate-ccw 16s linear infinite;
}

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

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

/* 多边形连线 dashoffset 流动动画模拟神经信号传递 */
.neural-line-cyan {
  stroke: var(--color-cyan);
  stroke-dasharray: 8 14;
  animation: neural-dash 4s linear infinite;
}

.neural-line-purple {
  stroke: var(--color-purple);
  stroke-dasharray: 10 16;
  animation: neural-dash 5s linear infinite reverse;
}

@keyframes neural-dash {
  0% { stroke-dashoffset: 150; }
  100% { stroke-dashoffset: 0; }
}

/* 节点小圆点按节奏脉冲发光 */
.neural-node {
  transform-origin: center;
  animation: neural-node-pulse 2s infinite ease-in-out;
}

.neural-node-cyan {
  fill: #FFFFFF;
  filter: drop-shadow(0 0 6px var(--color-cyan));
}

.neural-node-purple {
  fill: #FFFFFF;
  filter: drop-shadow(0 0 6px var(--color-purple));
  animation-delay: 1s;
}

@keyframes neural-node-pulse {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.6); opacity: 1; }
}

/* 中心 140×100px 锦鲤 SVG 动画 */
.koi-container {
  position: relative;
  z-index: 3;
  width: 140px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: koi-swim 3s ease-in-out infinite;
  /* 双层 drop-shadow 辉光 */
  filter: drop-shadow(0 0 12px var(--color-cyan)) drop-shadow(0 0 28px var(--color-purple));
}

@keyframes koi-swim {
  0% {
    transform: translateY(0) rotate(0deg) scaleX(1);
  }
  25% {
    transform: translateY(-5px) rotate(4deg) scaleX(1.03);
  }
  50% {
    transform: translateY(0) rotate(0deg) scaleX(1);
  }
  75% {
    transform: translateY(5px) rotate(-4deg) scaleX(0.97);
  }
  100% {
    transform: translateY(0) rotate(0deg) scaleX(1);
  }
}

/* ==========================================================================
   产品核心优势卡片 (保持栅格与组件结构不变)
   ========================================================================== */

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
  color: #FFFFFF;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 16px;
  color: var(--text-dim);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  position: relative;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  opacity: 0;
  transition: opacity 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--color-cyan);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.25);
}

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

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-btn);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  margin-bottom: 22px;
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: rgba(168, 85, 247, 0.1);
  border-color: var(--border-purple);
  color: var(--color-purple);
}

.feature-title {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid rgba(6, 182, 212, 0.15);
}

.tag-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: var(--radius-btn);
  background: rgba(6, 182, 212, 0.06);
  color: var(--color-cyan);
  border: 1px solid rgba(6, 182, 212, 0.18);
}

/* ==========================================================================
   流媒体与 AI 支持图卡
   ========================================================================== */

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.matrix-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 34px 30px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.matrix-card:hover {
  border-color: var(--color-cyan);
  background: var(--bg-card-hover);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.2);
}

.matrix-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.matrix-badge-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}

.icon-stream {
  background: rgba(239, 68, 68, 0.12);
  color: #EF4444;
  border-color: rgba(239, 68, 68, 0.3);
}

.icon-ai {
  background: rgba(6, 182, 212, 0.12);
  color: var(--color-cyan);
  border-color: rgba(6, 182, 212, 0.3);
}

.matrix-title {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
}

.matrix-desc {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 22px;
}

.supported-logos {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: auto;
}

.service-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 6px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  text-align: center;
  transition: all 0.2s;
}

.service-pill:hover {
  background: rgba(6, 182, 212, 0.08);
  border-color: var(--color-cyan);
  transform: translateY(-2px);
}

.service-icon {
  width: 22px;
  height: 22px;
  margin-bottom: 6px;
}

.service-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: #FFFFFF;
}

.service-sub {
  font-size: 10px;
  color: var(--color-cyan);
  margin-top: 2px;
}

/* ==========================================================================
   套餐价格对比表 (Pricing Table)
   ========================================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-cyan);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.3);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.12) 0%, rgba(11, 17, 32, 0.95) 100%);
  border: 1px solid var(--color-cyan);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.3);
}

.hot-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-purple) 100%);
  color: #020617;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  padding: 3px 12px;
  border-radius: var(--radius-btn);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 18px;
}

.plan-name {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 12px;
  color: var(--text-dim);
  min-height: 36px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(6, 182, 212, 0.15);
}

.price-currency {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-cyan);
}

.price-number {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1;
}

.price-period {
  font-size: 13px;
  color: var(--text-dim);
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

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

.feature-check {
  color: var(--color-cyan);
  font-weight: 800;
}

.feature-highlight {
  color: #FFFFFF;
  font-weight: 600;
}

/* ==========================================================================
   用户评价 (User Reviews)
   ========================================================================== */

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-cyan);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.review-stars {
  color: #F59E0B;
  font-size: 14px;
  margin-bottom: 12px;
}

.review-text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid rgba(6, 182, 212, 0.15);
}

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-btn);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--color-cyan);
}

.author-info h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
}

.author-info p {
  font-size: 11px;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题 FAQ
   ========================================================================== */

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item:hover {
  border-color: var(--color-cyan);
}

.faq-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

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

.faq-arrow {
  width: 18px;
  height: 18px;
  color: var(--color-cyan);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(6, 182, 212, 0.1);
  padding-top: 14px;
}

/* 底部 CTA 横幅 */
.bottom-cta-banner {
  margin: 60px 0 20px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.12) 0%, rgba(168, 85, 247, 0.14) 100%);
  border: 1px solid var(--color-cyan);
  border-radius: var(--radius-btn);
  padding: 50px 32px;
  text-align: center;
  box-shadow: 0 0 35px rgba(6, 182, 212, 0.2);
}

.bottom-cta-banner h2 {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.bottom-cta-banner p {
  font-size: 15px;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto 28px;
}

/* ==========================================================================
   页脚规范：严格仅保留 4 个标题链接在新窗口打开
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-color);
  background: #020617;
  padding: 44px 0 32px;
  margin-top: auto;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-link {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-btn);
  transition: all 0.2s;
  text-decoration: none;
}

.footer-link:hover {
  color: var(--color-cyan);
  background: rgba(6, 182, 212, 0.08);
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.footer-copyright {
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ==========================================================================
   子页面排版 (关于我们、服务条款、隐私政策、网站地图、知识科普)
   ========================================================================== */

.subpage-hero {
  padding: 56px 0 36px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(11, 17, 32, 0.6);
}

.subpage-title {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.subpage-desc {
  font-size: 15px;
  color: var(--text-dim);
  max-width: 660px;
  margin: 0 auto;
}

.subpage-content {
  max-width: 900px;
  margin: 46px auto 70px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 42px;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

.subpage-section {
  margin-bottom: 36px;
}

.subpage-section:last-child {
  margin-bottom: 0;
}

.subpage-heading {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.subpage-heading svg {
  color: var(--color-cyan);
}

.subpage-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
}

.subpage-list {
  padding-left: 20px;
  margin-bottom: 14px;
}

.subpage-list li {
  list-style: disc;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 8px;
}

.subpage-list li strong {
  color: #FFFFFF;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.sitemap-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 22px;
}

.sitemap-card h2,
.sitemap-card h3 {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--color-cyan);
  margin-bottom: 12px;
  font-weight: 700;
}

.sitemap-card ul li {
  margin-bottom: 8px;
}

.sitemap-card a {
  color: var(--text-muted);
  font-size: 13px;
  text-decoration: none;
}

.sitemap-card a:hover {
  color: var(--color-cyan);
  text-decoration: underline;
}

/* ==========================================================================
   知识科普 9 篇 SEO 深度技术文章排版体系
   ========================================================================== */

.wiki-toc-section {
  margin-bottom: 50px;
}

.wiki-toc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.toc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 16px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  text-decoration: none;
}

.toc-card:hover {
  border-color: var(--color-cyan);
  transform: translateY(-3px);
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.25);
}

.toc-card-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-cyan);
  font-weight: 700;
  margin-bottom: 6px;
}

.toc-card-title {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
  line-height: 1.45;
}

.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 44px 38px;
  margin-bottom: 50px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  position: relative;
}

.seo-article-card:last-child {
  margin-bottom: 0;
}

.seo-article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  opacity: 0.8;
}

.article-header {
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(6, 182, 212, 0.15);
}

.article-main-title {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.35;
  margin-bottom: 14px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.meta-badge {
  padding: 2px 8px;
  border-radius: var(--radius-btn);
  background: rgba(6, 182, 212, 0.1);
  color: var(--color-cyan);
  border: 1px solid rgba(6, 182, 212, 0.25);
}

.article-body {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.85;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body h2 {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin: 28px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-body h2::before {
  content: ">";
  color: var(--color-cyan);
  font-weight: 800;
}

.article-body h3 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-cyan);
  margin: 20px 0 10px;
}

.article-body ul {
  padding-left: 20px;
  margin-bottom: 18px;
}

.article-body ul li {
  list-style: square;
  margin-bottom: 8px;
  color: var(--text-muted);
}

.article-body ul li strong {
  color: #FFFFFF;
}

.article-quote-box {
  background: rgba(6, 182, 212, 0.05);
  border-left: 3px solid var(--color-cyan);
  padding: 16px 20px;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  margin: 20px 0;
  font-size: 14px;
  color: var(--text-main);
}

.seo-internal-link {
  color: var(--color-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: all 0.2s;
}

.seo-internal-link:hover {
  color: #FFFFFF;
  text-shadow: 0 0 10px var(--color-cyan);
}

.article-cta-box {
  margin-top: 32px;
  padding: 24px;
  background: rgba(11, 17, 32, 0.8);
  border: 1px solid var(--color-cyan);
  border-radius: var(--radius-btn);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.article-cta-text h4 {
  font-family: var(--font-mono);
  font-size: 16px;
  color: #FFFFFF;
  margin-bottom: 4px;
}

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

@media (max-width: 860px) {
  .wiki-toc-grid {
    grid-template-columns: 1fr;
  }
  .seo-article-card {
    padding: 28px 20px;
  }
  .article-cta-box {
    flex-direction: column;
    text-align: center;
  }
  .article-cta-box .btn {
    width: 100%;
  }
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机端单栏完美呈现，触控热区友好
   ========================================================================== */

@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero-layout-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

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

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

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

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

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

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

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

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #020617;
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    display: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  }

  #mobile-nav-check:checked ~ .nav-menu {
    display: flex;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-title-sub {
    font-size: 20px;
  }

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

  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }

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

  .supported-logos {
    grid-template-columns: repeat(2, 1fr);
  }

  .subpage-content {
    padding: 24px 18px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
}

@media (max-width: 480px) {
  .stats-strip {
    grid-template-columns: 1fr;
  }

  .stat-item {
    border-right: none !important;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
  }

  .stat-item:last-child {
    border-bottom: none;
  }

  .neural-core-wrapper {
    transform: scale(0.9);
  }
}

/* ==========================================================================
   无障碍与体验增强 (WCAG 2.1 & 锚点防遮挡 & 减弱动效)
   ========================================================================== */

/* 键盘快速跳过导航 */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  background: var(--color-cyan);
  color: #020617;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  z-index: 99999;
  border-radius: var(--radius-btn);
  text-decoration: none;
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.8);
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  top: 20px;
  outline: 3px solid #FFFFFF;
}

/* 锚点防固定页眉遮挡偏移 */
[id] {
  scroll-margin-top: 88px;
}

/* 手机端触控热区保底规范 (至少 44×44px) */
.btn, .nav-link, .footer-link, .faq-summary, .toc-card, .seo-internal-link {
  min-height: 44px;
  box-sizing: border-box;
}

.nav-link {
  display: inline-flex;
  align-items: center;
}

/* 面包屑导航规范 */
.breadcrumb-nav {
  padding: 14px 0;
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.breadcrumb-nav a {
  color: var(--color-cyan);
  text-decoration: none;
  transition: opacity 0.2s;
}

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

.breadcrumb-separator {
  margin: 0 8px;
  color: var(--text-dim);
}

/* 减弱动效模式 (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;
  }
}

/* 390px (iPhone 标准) 与 360px (窄屏安卓) 极致防撑破保障 */
@media (max-width: 390px) {
  .site-header {
    padding: 0 12px;
  }
  
  .hero-section {
    padding: 30px 12px;
  }

  .hero-title {
    font-size: 26px;
    letter-spacing: -0.5px;
  }

  .hero-title-sub {
    font-size: 16px;
  }

  .neural-core-wrapper {
    transform: scale(0.82);
    margin: 10px auto;
  }

  .pricing-card {
    padding: 24px 16px;
  }

  .article-container, .subpage-content {
    padding: 20px 12px;
  }
}

@media (max-width: 360px) {
  .hero-title {
    font-size: 23px;
  }

  .btn {
    padding: 10px 14px;
    font-size: 13px;
  }

  .stat-val {
    font-size: 20px;
  }
}