/* ==========================================================================
   山水云 ShanShuiYun - 山峦数据流 + 量子云海 + 赛博科技 视觉样式表
   ========================================================================== */

:root {
  /* 统一管理颜色 */
  --bg-dark: #020617;                         /* 深空黑 */
  --bg-card: rgba(8, 17, 38, 0.78);
  --bg-card-hover: rgba(12, 26, 56, 0.88);
  --bg-surface: rgba(6, 14, 32, 0.82);
  --primary: #10B981;                         /* 主色：山峦青 */
  --primary-light: #06B6D4;                   /* 次色：云海青 */
  --secondary: #06B6D4;                       /* 云海青 */
  --accent: #10B981;                          /* 山峦青 */
  --accent-gold: #f59e0b;
  --text-main: #FFFFFF;                       /* 主文字：纯白 (对比度 19.8:1) */
  --text-secondary: rgba(255, 255, 255, 0.76);/* 次要文字 (对比度 > 10.8:1，远超 4.5:1) */
  --text-muted: rgba(255, 255, 255, 0.66);    /* 辅助文字 (对比度 > 8.2:1，远超 4.5:1) */
  --border-color: rgba(16, 185, 129, 0.18);
  --border-highlight: rgba(6, 182, 212, 0.55);
  --shadow-lg: 0 20px 50px -15px rgba(2, 6, 23, 0.85);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.3), 0 0 30px rgba(6, 182, 212, 0.22);

  /* 统一管理圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  /* 统一管理间距与内容宽度 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 88px;
  --container-width: 1200px;
}

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

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

body {
  font-family: "Inter", "Noto Sans SC", "Source Han Sans SC", "思源黑体", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  position: relative;
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 固定页眉不遮挡锚点标题 */
section[id],
article[id],
div[id] {
  scroll-margin-top: 92px;
}

/* 无障碍：跳转到主要内容链接 */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 9999;
  padding: 12px 20px;
  background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
  color: #020617;
  font-weight: 700;
  border-radius: var(--radius-md);
  box-shadow: 0 0 24px rgba(16, 185, 129, 0.7);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 14px;
  outline: 3px solid #FFFFFF;
  outline-offset: 2px;
}

/* 键盘访问焦点样式 */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
details:focus-visible {
  outline: 2px solid #06B6D4;
  outline-offset: 3px;
  border-radius: 6px;
}

/* 确保内容层级在全屏赛博山峦背景之上 */
header,
main,
footer {
  position: relative;
  z-index: 2;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

ul {
  list-style: none;
}

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

/* ==========================================================================
   全屏背景动效层：山峦起伏数据流 SVG + 渐隐细网格 + 双青色呼吸光晕
   ========================================================================== */
.cyber-bg-layer {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  background-color: #020617;
}

/* 叠加细网格线（带 radial mask 让边缘渐隐） */
.cyber-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(16, 185, 129, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(6, 182, 212, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 75% 70% at 50% 45%, #000 25%, transparent 85%);
  mask-image: radial-gradient(ellipse 75% 70% at 50% 45%, #000 25%, transparent 85%);
}

/* 2 个青/青大型 blur 光晕缓慢呼吸缩放 */
.cyber-halo {
  position: absolute;
  border-radius: 50%;
  filter: blur(115px);
  opacity: 0.28;
  will-change: transform, opacity;
}

.cyber-halo-1 {
  width: 560px;
  height: 560px;
  top: -120px;
  left: 8%;
  background: radial-gradient(circle, #10B981 0%, transparent 70%);
  animation: haloBreathe1 9s ease-in-out infinite alternate;
}

.cyber-halo-2 {
  width: 620px;
  height: 620px;
  bottom: -140px;
  right: 6%;
  background: radial-gradient(circle, #06B6D4 0%, transparent 70%);
  animation: haloBreathe2 11s ease-in-out infinite alternate;
}

@keyframes haloBreathe1 {
  0% { transform: scale(0.88) translate(0, 0); opacity: 0.22; }
  100% { transform: scale(1.18) translate(30px, 25px); opacity: 0.36; }
}

@keyframes haloBreathe2 {
  0% { transform: scale(1.12) translate(0, 0); opacity: 0.32; }
  100% { transform: scale(0.86) translate(-35px, -20px); opacity: 0.2; }
}

/* 全屏山峦起伏数据流 SVG 容器 */
.cyber-mountain-streams {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.65;
}

.stream-path {
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
}

.stream-path-1 {
  stroke: #10B981;
  stroke-dasharray: 220 180;
  animation: mountainFlow 8.5s linear infinite;
}

.stream-path-2 {
  stroke: #06B6D4;
  stroke-dasharray: 180 210;
  animation: mountainFlowReverse 9.2s linear infinite;
}

.stream-path-3 {
  stroke: #10B981;
  stroke-dasharray: 260 160;
  animation: mountainFlow 9.8s linear infinite;
}

.stream-path-4 {
  stroke: #06B6D4;
  stroke-dasharray: 200 190;
  animation: mountainFlowReverse 8.2s linear infinite;
}

.stream-path-5 {
  stroke: #10B981;
  stroke-dasharray: 240 200;
  animation: mountainFlow 10s linear infinite;
}

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

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

/* 路径交汇节点处发光小圆点按节奏脉冲 */
.stream-node {
  animation: streamNodePulse 2.8s ease-in-out infinite;
  transform-box: fill-box;
  transform-origin: center;
}

.stream-node.delay-1 { animation-delay: 0.6s; }
.stream-node.delay-2 { animation-delay: 1.2s; }
.stream-node.delay-3 { animation-delay: 1.8s; }
.stream-node.delay-4 { animation-delay: 2.3s; }

@keyframes streamNodePulse {
  0%, 100% {
    opacity: 0.35;
    transform: scale(0.85);
  }
  50% {
    opacity: 1;
    transform: scale(1.45);
  }
}

/* ==========================================================================
   布局容器与通用区块
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
  position: relative;
}

.section-alt {
  background: rgba(2, 6, 23, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.38);
  color: var(--primary-light);
  font-family: "Space Grotesk", "Inter", monospace;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-family: "Space Grotesk", "Inter", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, #FFFFFF 0%, #10B981 55%, #06B6D4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.0625rem;
}

/* ==========================================================================
   CTA 按钮规范：山青色渐变按钮，圆角 12px，带 30px 青色辉光，hover 时光晕扩大
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  min-width: 48px;
  padding: 12px 28px;
  border-radius: var(--radius-md); /* 12px 圆角 */
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease, background 0.25s ease;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
  color: #020617;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.55), 0 0 30px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 48px rgba(16, 185, 129, 0.85), 0 0 70px rgba(6, 182, 212, 0.65);
  filter: brightness(1.08);
}

.btn-outline {
  background: rgba(8, 17, 38, 0.72);
  color: var(--text-main);
  border-radius: var(--radius-md);
  border: 1px solid rgba(6, 182, 212, 0.5);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.18);
}

.btn-outline:hover {
  background: rgba(16, 185, 129, 0.16);
  border-color: #10B981;
  transform: translateY(-2px);
  box-shadow: 0 0 45px rgba(16, 185, 129, 0.42), 0 0 60px rgba(6, 182, 212, 0.35);
}

.btn-lg {
  min-height: 54px;
  padding: 14px 36px;
  font-size: 1.125rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   顶部导航栏
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: var(--space-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: "Space Grotesk", "Inter", "Noto Sans SC", "思源黑体", sans-serif;
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text-main);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.22), rgba(6, 182, 212, 0.22));
  border: 1px solid var(--border-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 18px rgba(16, 185, 129, 0.25);
}

.brand-sub {
  font-family: "Space Grotesk", monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-light);
  display: block;
  letter-spacing: 0.8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 6px 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
}

.nav-links a:hover,
.nav-links a.active-nav {
  color: #FFFFFF;
  background: rgba(16, 185, 129, 0.14);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.2);
}

/* ==========================================================================
   主视觉区 (Hero Section) - 大标题布局 + 340x340px 神经网络山水核心
   ========================================================================== */
.hero {
  padding: 84px 0 72px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-lg);
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.38);
  color: #10B981;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 22px;
}

.hero-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 12px #10B981;
  flex-shrink: 0;
}

/* 左侧：H1「山水云」使用 Space Grotesk，700 字重，山青到云青渐变 + 双层文字阴影 */
.hero-title {
  font-family: "Space Grotesk", "Inter", "Noto Sans SC", "Source Han Sans SC", "思源黑体", sans-serif;
  font-size: 3.15rem;
  font-weight: 700;
  line-height: 1.22;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
  color: #FFFFFF;
  text-shadow:
    0 2px 14px rgba(16, 185, 129, 0.35),
    0 6px 32px rgba(6, 182, 212, 0.28);
}

.hero-title span {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-weight: 700;
  background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter:
    drop-shadow(0 2px 12px rgba(16, 185, 129, 0.45))
    drop-shadow(0 6px 28px rgba(6, 182, 212, 0.38));
}

.hero-subtitle {
  font-size: 1.2rem;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 18px;
  max-width: 620px;
}

.hero-intro-box {
  background: rgba(8, 17, 38, 0.75);
  border-left: 3px solid #10B981;
  border-top: 1px solid rgba(6, 182, 212, 0.2);
  border-right: 1px solid rgba(6, 182, 212, 0.2);
  border-bottom: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin-bottom: 30px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  max-width: 620px;
}

.hero-intro-box strong {
  color: #FFFFFF;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: 42px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
}

.metric-value {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text-main);
}

.metric-value span {
  color: var(--primary-light);
}

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

/* 右侧动画容器（保持原有栅格位置，内置 340×340px 神经网络核心 + 200×120px 山峦剪影） */
.hero-visual {
  background: linear-gradient(160deg, rgba(8, 17, 38, 0.88), rgba(2, 6, 23, 0.94));
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.visual-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.visual-title {
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-pill {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.16);
  color: #10B981;
  font-weight: 600;
}

/* 340×340px 神经网络核心舞台 */
.neural-core-stage {
  width: 340px;
  height: 340px;
  max-width: 100%;
  margin: 0 auto 20px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(16, 185, 129, 0.12) 0%, rgba(6, 182, 212, 0.05) 48%, transparent 72%);
  border-radius: 16px;
}

/* 4 个角落叠加等宽字体数据标签 */
.cyber-corner-tag {
  position: absolute;
  font-family: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.6px;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(2, 6, 23, 0.85);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #10B981;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.25);
  z-index: 5;
  pointer-events: none;
}

.cyber-corner-tag.top-left {
  top: 8px;
  left: 8px;
  color: #10B981;
  border-color: rgba(16, 185, 129, 0.45);
}

.cyber-corner-tag.top-right {
  top: 8px;
  right: 8px;
  color: #06B6D4;
  border-color: rgba(6, 182, 212, 0.45);
}

.cyber-corner-tag.bottom-left {
  bottom: 8px;
  left: 8px;
  color: #06B6D4;
  border-color: rgba(6, 182, 212, 0.45);
}

.cyber-corner-tag.bottom-right {
  bottom: 8px;
  right: 8px;
  color: #10B981;
  border-color: rgba(16, 185, 129, 0.45);
}

/* 340×340px 神经网络多边形连线与双层反向旋转轨道 SVG */
.neural-network-svg {
  width: 340px;
  height: 340px;
  position: absolute;
  inset: 0;
  z-index: 2;
}

.orbit-cw {
  transform-origin: 170px 170px;
  animation: orbitRotateCW 22s linear infinite;
}

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

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

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

/* 神经网络多边形与交叉连线流动动画 */
.neural-line-emerald {
  stroke: #10B981;
  stroke-dasharray: 18 10;
  animation: neuralSignal 4.5s linear infinite;
}

.neural-line-cyan {
  stroke: #06B6D4;
  stroke-dasharray: 14 12;
  animation: neuralSignalReverse 5.2s linear infinite;
}

@keyframes neuralSignal {
  0% { stroke-dashoffset: 112; }
  100% { stroke-dashoffset: 0; }
}

@keyframes neuralSignalReverse {
  0% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: 104; }
}

/* 所有神经网络节点按节奏脉冲发光 */
.neural-node {
  animation: neuralNodeGlow 2.2s ease-in-out infinite;
  transform-box: fill-box;
  transform-origin: center;
}

.neural-node.n-delay-1 { animation-delay: 0.4s; }
.neural-node.n-delay-2 { animation-delay: 0.9s; }
.neural-node.n-delay-3 { animation-delay: 1.4s; }
.neural-node.n-delay-4 { animation-delay: 1.8s; }

@keyframes neuralNodeGlow {
  0%, 100% {
    opacity: 0.45;
    transform: scale(0.85);
  }
  50% {
    opacity: 1;
    transform: scale(1.4);
  }
}

/* 中心 200×120px 山峦剪影 SVG：上下浮动 4 秒一周期 + 双层 drop-shadow 辉光 */
.mountain-silhouette-wrap {
  width: 200px;
  height: 120px;
  position: relative;
  z-index: 4;
  animation: mountainFloat 4s ease-in-out infinite;
  filter:
    drop-shadow(0 0 12px rgba(16, 185, 129, 0.72))
    drop-shadow(0 0 26px rgba(6, 182, 212, 0.52));
}

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

.node-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.node-name {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-weight: 600;
  font-size: 0.88rem;
}

.node-badge {
  font-size: 0.7rem;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(6, 182, 212, 0.16);
  color: var(--primary-light);
}

.node-ping {
  font-family: monospace;
  font-size: 0.88rem;
  color: #10B981;
  font-weight: 700;
  flex-shrink: 0;
}

/* ==========================================================================
   产品核心优势介绍 (3个图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.feature-illustration {
  height: 190px;
  background: linear-gradient(145deg, rgba(2, 6, 23, 0.9) 0%, rgba(16, 185, 129, 0.12) 100%);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
}

.feature-body {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.feature-tag {
  font-family: "Space Grotesk", monospace;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

.feature-title {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  color: var(--text-secondary);
  font-size: 0.96rem;
  margin-bottom: 20px;
  flex: 1;
}

.feature-points {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.88rem;
  color: #FFFFFF;
}

/* ==========================================================================
   流媒体与 AI 支持图卡（无行内样式，统一复用类）
   ========================================================================== */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(10px);
}

.media-card:hover {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.media-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.media-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
}

.icon-ai  { background: rgba(16, 185, 129, 0.16); color: #34d399; }
.icon-cl  { background: rgba(245, 158, 11, 0.16); color: #fbbf24; }
.icon-nf  { background: rgba(239, 68, 68, 0.16);  color: #f87171; }
.icon-dp  { background: rgba(59, 130, 246, 0.18); color: #60a5fa; }
.icon-yt  { background: rgba(220, 38, 38, 0.18);  color: #fca5a5; }
.icon-tk  { background: rgba(6, 182, 212, 0.18);  color: #22d3ee; }
.icon-sp  { background: rgba(34, 197, 94, 0.16);  color: #4ade80; }
.icon-acg { background: rgba(168, 85, 247, 0.18); color: #c084fc; }

.unlock-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.15);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.media-name {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.media-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.media-regions {
  font-size: 0.78rem;
  color: var(--primary-light);
  padding-top: 10px;
  border-top: 1px dashed var(--border-color);
}

/* ==========================================================================
   套餐价格对比表
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 44px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  backdrop-filter: blur(10px);
}

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

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.14) 0%, rgba(8, 17, 38, 0.95) 38%);
  border: 2px solid #10B981;
  box-shadow: var(--shadow-glow);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
  color: #020617;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.5);
}

.plan-name {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.price-currency {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.price-amount {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2.85rem;
  font-weight: 700;
  line-height: 1;
}

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

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 30px;
  flex: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: #FFFFFF;
}

.check-icon {
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
}

/* 参数横向对比表（仅让表格容器横向滚动，包含 caption 与表头关联） */
.compare-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  backdrop-filter: blur(10px);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.compare-table caption {
  padding: 16px 20px 12px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.94rem;
}

.compare-table thead th {
  background: rgba(16, 185, 129, 0.08);
  color: var(--text-main);
  font-weight: 700;
}

.compare-table tbody th {
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.01);
}

.compare-table tr:last-child th,
.compare-table tr:last-child td {
  border-bottom: none;
}

.table-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.highlight-price {
  color: var(--primary-light);
}

.table-cta-cyan {
  color: var(--primary-light);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.table-cta-emerald {
  color: var(--accent);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

/* ==========================================================================
   用户评价 (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(10px);
}

.review-stars {
  color: var(--accent-gold);
  font-size: 1.05rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-content {
  color: #FFFFFF;
  font-size: 0.96rem;
  margin-bottom: 22px;
  font-style: normal;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #10B981, #06B6D4);
  color: #020617;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.author-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.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-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
  backdrop-filter: blur(10px);
}

.faq-item[open] {
  border-color: var(--border-highlight);
}

.faq-question {
  min-height: 48px;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
}

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

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.14);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  background: linear-gradient(135deg, #10B981, #06B6D4);
  color: #020617;
}

.faq-answer {
  padding: 16px 24px 22px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  border-top: 1px solid rgba(16, 185, 129, 0.12);
}

/* ==========================================================================
   底部召唤横幅 (CTA Banner)
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.18) 0%, rgba(6, 182, 212, 0.15) 100%);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  text-align: center;
  box-shadow: var(--shadow-glow);
  backdrop-filter: blur(12px);
}

.cta-banner h2 {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 2.1rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.cta-banner p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
}

/* ==========================================================================
   极简规范页脚 (只保留四个标题，打开新页面展示)
   ========================================================================== */
.site-footer {
  background: rgba(2, 6, 23, 0.92);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}

.footer-only-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 42px;
}

.footer-only-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}

.footer-only-links a:hover {
  color: #FFFFFF;
  border-color: var(--border-highlight);
  background: rgba(16, 185, 129, 0.12);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.25);
}

/* ==========================================================================
   独立子页面通用样式 (网站地图 / 关于我们 / 服务条款 / 隐私政策 / 知识科普)
   ========================================================================== */
.subpage-main {
  padding: 64px 0 96px;
  min-height: calc(100vh - 160px);
}

.subpage-card {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  backdrop-filter: blur(12px);
}

.subpage-card h1 {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subpage-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.subpage-section {
  margin-bottom: 32px;
}

.subpage-section.mb-0 {
  margin-bottom: 0;
}

.subpage-section h2 {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.subpage-section p,
.subpage-section li {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 10px;
}

.subpage-section strong {
  color: #FFFFFF;
}

.subpage-section ul {
  padding-left: 20px;
  list-style: disc;
}

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

.link-emerald {
  color: var(--primary);
}

.cta-row-gap {
  margin-top: 20px;
}

/* ==========================================================================
   知识科普页：9篇 SEO 专栏文章样式
   ========================================================================== */
.seo-toc-box {
  background: rgba(2, 6, 23, 0.72);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 36px;
}

.seo-toc-title {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.subpage-card .seo-toc-list,
.seo-toc-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 20px;
  list-style: none;
  padding-left: 0;
}

.seo-toc-list li {
  margin-bottom: 0;
}

.seo-toc-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: #FFFFFF;
  font-size: 0.9rem;
  line-height: 1.45;
}

.seo-toc-list a:hover {
  border-color: #06B6D4;
  background: rgba(6, 182, 212, 0.16);
  color: #10B981;
}

.seo-articles-list {
  max-width: 900px;
  margin: 36px auto 0;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.seo-article-card:hover {
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.seo-article-card.brand-featured {
  border: 2px solid #10B981;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.seo-article-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.seo-article-cat {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #10B981;
  font-size: 0.78rem;
  font-weight: 700;
}

.seo-article-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: "Space Grotesk", monospace;
}

.seo-article-card h2 {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.38;
  color: #FFFFFF;
  margin-bottom: 18px;
}

.seo-article-card h3 {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: #06B6D4;
  margin: 20px 0 10px;
}

.seo-article-card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.78;
  margin-bottom: 14px;
}

.seo-article-card strong {
  color: #FFFFFF;
}

.seo-inline-link {
  color: #10B981;
  font-weight: 700;
  border-bottom: 1px dashed #06B6D4;
  padding-bottom: 1px;
}

.seo-inline-link:hover {
  color: #06B6D4;
  border-bottom-style: solid;
}

.seo-keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

.seo-kw-tag {
  font-size: 0.76rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.28);
  color: #06B6D4;
}

.article-faq-box {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed rgba(16, 185, 129, 0.28);
}

.article-faq-title {
  font-family: "Space Grotesk", "Noto Sans SC", "思源黑体", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: #10B981;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-faq-list .faq-question {
  padding: 14px 18px;
  font-size: 0.96rem;
}

.article-faq-list .faq-answer {
  padding: 12px 18px 16px;
  font-size: 0.92rem;
}

.article-cta-wrap {
  margin-top: 18px;
}

/* ==========================================================================
   动画无障碍降级：遵循 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;
  }
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保 360/390/768/1440px 完美显示且无横向溢出
   ========================================================================== */
.hero-grid > *,
.features-grid > *,
.pricing-grid > *,
.reviews-grid > *,
.media-ai-grid > *,
.seo-toc-list > * {
  min-width: 0;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .media-ai-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 60px 0;
  }

  .navbar-inner {
    flex-wrap: wrap;
    padding: 12px 16px;
  }

  .navbar-inner .btn {
    padding: 8px 16px;
    font-size: 0.9rem;
    min-height: 44px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
  }

  .nav-links a {
    white-space: nowrap;
    min-height: 44px;
    font-size: 0.86rem;
    padding: 8px 6px;
    background: rgba(8, 17, 38, 0.75);
    border: 1px solid rgba(16, 185, 129, 0.16);
  }

  .hero {
    padding: 48px 0 56px;
  }

  .hero-tag {
    max-width: 100%;
    font-size: 0.8rem;
    padding: 6px 12px;
  }

  .hero-title {
    font-size: 1.95rem;
  }

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

  .hero-visual {
    padding: 18px 14px;
  }

  .neural-core-stage {
    width: 100%;
    max-width: 280px;
    height: 280px;
  }

  .neural-network-svg {
    width: 100%;
    height: 100%;
  }

  /* 手机端按钮全宽单栏，高度 >= 52px 适合手指点击 */
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn,
  .cta-banner .btn {
    width: 100%;
    min-height: 52px;
    font-size: 1.05rem;
  }

  .hero-metrics {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .media-ai-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .section-title {
    font-size: 1.75rem;
  }

  .cta-banner {
    padding: 40px 20px;
  }

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

  .footer-only-links a {
    width: 100%;
    text-align: center;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(8, 17, 38, 0.75);
    border-color: var(--border-color);
  }

  .subpage-card,
  .seo-article-card {
    padding: 28px 18px;
  }

  .subpage-card .seo-toc-list,
  .seo-toc-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .seo-article-card h2 {
    font-size: 1.28rem;
  }
}