/* ============================================================
   四次元空间 · 浅色科技空间视觉体系（v2）
   设计母题：四维空间 / 透视网格 / 坐标轴 / 数据光弧
   内容区浅色提亮，Hero 保留深空感作对比
   ============================================================ */

/* ---------- 设计 Token ---------- */
:root {
  /* 浅色内容区色板（对齐 xyaqyun.cn 校安云官网） */
  --bg: #f4f8fd;                 /* 页面主底：浅蓝白 */
  --bg-alt: #e6ecf4;             /* 交替区块底：浅蓝灰 */
  --bg-deep: #dfe9f7;             /* 更明显的浅蓝底（节奏区） */
  --panel: #ffffff;              /* 卡片 */
  --ink: #10233f;                /* 主文字：深蓝黑 */
  --muted: #45556b;              /* 次级文字 */
  --faint: #7c8ba0;              /* 弱文字 */
  --cyan: #35b6ff;               /* 亮蓝（渐变强调） */
  --blue: #0a6cf1;               /* 主蓝（按钮/强调） */
  --blue-bright: #5ad5ff;        /* 亮蓝渐变端 */
  --teal: #00c2a8;               /* 青绿点缀 */
  --violet: #7c5cff;             /* 紫罗兰点缀 */
  --line: rgba(10, 108, 241, 0.12);
  --line-strong: rgba(10, 108, 241, 0.26);
  --ok: #16a34a;

  /* Hero 深海军蓝区（对齐参考站） */
  --space-bg: #081c34;
  --space-ink: #e8f1ff;
  --space-muted: #a9bce0;
  --space-line: rgba(125, 214, 255, 0.22);

  /* 页脚深色 */
  --foot-bg: #0d2846;

  /* 字体 */
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-tech: "Space Grotesk", "Noto Sans SC", monospace;

  /* 尺寸节奏 */
  --radius: 16px;
  --radius-sm: 9px;
  --shadow-card: 0 2px 12px rgba(20, 48, 100, 0.06);
  --shadow-card-hover: 0 16px 36px rgba(20, 48, 100, 0.12);
  --shadow-glow: 0 0 22px rgba(10, 108, 241, 0.2);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 基础 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 全站细颗粒噪点纹理（低透明） */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* 全站背景网格底纹（浅色坐标感） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(24, 66, 132, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 66, 132, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 30%, transparent 78%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}
ul {
  list-style: none;
}
ul li {
  margin: 8px 0;
}
a {
  color: var(--blue);
}
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
::selection {
  background: rgba(10, 108, 241, 0.16);
}

/* 区块：交替底增强节奏 */
section {
  padding: 88px 0;
  position: relative;
  z-index: 2;
}
/* 交替区块：上下渐变过渡，模块衔接自然 */
section:nth-of-type(even) {
  background:
    radial-gradient(ellipse 90% 70% at 85% 0%, rgba(53, 182, 255, 0.07), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 110px, var(--bg-alt) calc(100% - 110px), var(--bg) 100%);
}
/* 交替区块顶部加一道柔和分隔光 */
section:nth-of-type(even)::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(10, 108, 241, 0.22), transparent);
  pointer-events: none;
}
.page-content {
  margin-top: 72px;
  padding-top: 40px;
  background: var(--bg) !important;
}

/* 重点板块节奏区：校安云 / 智能建造实训 使用更明显的浅蓝底 */
#xiaoanyun, #smart-build {
  background:
    radial-gradient(ellipse 80% 60% at 12% 8%, rgba(10, 108, 241, 0.08), transparent 55%),
    radial-gradient(ellipse 70% 60% at 90% 30%, rgba(53, 182, 255, 0.1), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 150px, var(--bg-deep) calc(100% - 150px), var(--bg) 100%);
}

/* 标题体系 */
.section-title {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.section-title::before {
  content: attr(data-index);
  font-family: var(--font-tech);
  font-size: 15px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 1px;
  opacity: 0.9;
}
.section-title::after {
  content: "";
  width: 46px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
  border-radius: 2px;
}
.sub-title {
  margin: 40px 0 14px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sub-title::before {
  content: "";
  width: 6px;
  height: 6px;
  transform: rotate(45deg);
  background: var(--blue);
  box-shadow: 0 0 8px rgba(10, 108, 241, 0.55);
}
.desc {
  margin-bottom: 22px;
  color: var(--muted);
  max-width: 760px;
}

/* ---------- 页面加载动画：四维立方体线框 ---------- */
.page-loader {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: #ffffff;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 22px;
  transition: opacity 0.5s ease, visibility 0.5s;
}
.page-loader.hide {
  opacity: 0;
  visibility: hidden;
}
.loader-cube {
  width: 64px;
  height: 64px;
  position: relative;
  transform-style: preserve-3d;
  animation: cubeSpin 2.4s var(--ease-out) infinite;
}
.loader-cube .face {
  position: absolute;
  inset: 14px;
  border: 1.5px solid var(--blue);
  border-radius: 6px;
  opacity: 0.85;
  box-shadow: inset 0 0 18px rgba(10, 108, 241, 0.18);
}
.loader-cube .face.f2 { transform: rotateY(90deg); }
.loader-cube .face.f3 { transform: rotateX(90deg); }
.loader-cube .face.f4 { transform: rotateX(-90deg); }
.loader-cube .face.f5 { transform: rotateY(-90deg); }
@keyframes cubeSpin {
  0%   { transform: rotateX(-18deg) rotateY(0deg); }
  50%  { transform: rotateX(18deg) rotateY(180deg); }
  100% { transform: rotateX(-18deg) rotateY(360deg); }
}
.loader-text {
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 导航（滚动吸附切换） ---------- */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 999;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s, box-shadow 0.3s;
}
body.home header {
  background: linear-gradient(180deg, rgba(6, 13, 34, 0.72), rgba(6, 13, 34, 0));
}
header.scrolled {
  background: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--line);
  box-shadow: 0 4px 24px rgba(20, 48, 100, 0.08);
}
.nav-wrap {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(90deg, #10233f 20%, #0a6cf1 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
body.home header:not(.scrolled) .logo {
  background: linear-gradient(90deg, #fff 20%, #7dd6ff 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.logo svg {
  flex: none;
}
.logo span {
  white-space: nowrap;
}
.nav-list {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-list a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 13px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  position: relative;
}
.nav-list a:hover {
  color: var(--ink);
  background: rgba(10, 108, 241, 0.07);
}
.nav-list a.active {
  color: var(--blue);
  font-weight: 600;
}
.nav-list a.active::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: 2px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
  border-radius: 2px;
}
/* 首页 hero 上（未滚动）：导航文字浅色 */
body.home header:not(.scrolled) .nav-list a {
  color: var(--space-muted);
}
body.home header:not(.scrolled) .nav-list a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}
body.home header:not(.scrolled) .nav-list a.active {
  color: #7dd6ff;
}
body.home header:not(.scrolled) .menu-btn {
  color: #e8f1ff;
  border-color: rgba(122, 162, 255, 0.3);
}
.menu-btn {
  display: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--ink);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--line);
  align-items: center;
  justify-content: center;
}

/* ---------- Hero（深空区） ---------- */
#home {
  margin-top: 0;
  padding-top: 0;
  min-height: 92vh;
  position: relative;
  overflow: hidden;
  background: var(--space-bg);
}
#home::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 90% 80% at 75% 20%, rgba(10, 108, 241, 0.2), transparent 62%),
    radial-gradient(ellipse 70% 90% at 15% 75%, rgba(53, 182, 255, 0.14), transparent 60%);
  pointer-events: none;
}
#bg-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.9;
}
.carousel {
  position: relative;
  width: 100%;
  height: 88vh;
  min-height: 620px;
  overflow: hidden;
  z-index: 2;
}
.carousel-inner {
  width: 100%;
  height: 100%;
}
.carousel-item {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  opacity: 0;
  transition: opacity 0.9s ease;
}
.carousel-item.active {
  opacity: 1;
}
.carousel-bg {
  position: absolute;
  width: 100%; height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 1;
  animation: kenburns 16s ease-in-out infinite alternate;
}
.carousel-item:nth-child(1) .carousel-bg {
  background-image: linear-gradient(100deg, rgba(8,28,52,0.92) 0%, rgba(8,28,52,0.58) 40%, rgba(8,28,52,0.26) 62%, rgba(8,28,52,0.08) 100%), url("/images/slide1.jpg");
}
.carousel-item:nth-child(2) .carousel-bg {
  background-image: linear-gradient(100deg, rgba(8,28,52,0.92) 0%, rgba(8,28,52,0.58) 40%, rgba(8,28,52,0.26) 62%, rgba(8,28,52,0.08) 100%), url("/images/slide2.jpg");
}
.carousel-item:nth-child(3) .carousel-bg {
  background-image: linear-gradient(100deg, rgba(8,28,52,0.92) 0%, rgba(8,28,52,0.58) 40%, rgba(8,28,52,0.26) 62%, rgba(8,28,52,0.08) 100%), url("/images/slide3.jpg");
}
@keyframes kenburns {
  from { transform: scale(1) translateX(0); }
  to   { transform: scale(1.09) translateX(-1.5%); }
}
.carousel-item .container {
  position: relative;
  z-index: 3;
  padding-top: 15vh;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 3px;
  color: #7dd6ff;
  margin-bottom: 20px;
  padding: 7px 16px;
  border: 1px solid rgba(125, 214, 255, 0.32);
  border-radius: 999px;
  background: rgba(53, 182, 255, 0.1);
}
.hero-eyebrow::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: #7dd6ff;
  box-shadow: 0 0 8px #7dd6ff;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
.banner h1 {
  font-size: clamp(34px, 5.4vw, 58px);
  font-weight: 900;
  letter-spacing: 1px;
  line-height: 1.22;
  margin-bottom: 18px;
  color: var(--space-ink);
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}
.banner h1 .hl {
  background: linear-gradient(92deg, #35b6ff 5%, #5ad5ff 55%, #9bd8ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.banner p {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--space-muted);
  max-width: 640px;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45);
}
.banner-desc {
  margin-top: 26px;
  max-width: 660px;
}
.banner-desc p {
  font-size: 15px;
  color: #c3d3f2;
}
.carousel::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 120px;
  z-index: 4;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, var(--space-bg));
}
.carousel-prev, .carousel-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px; height: 46px;
  border-radius: 50%;
  background: rgba(10, 20, 44, 0.5);
  border: 1px solid rgba(122, 162, 255, 0.3);
  color: #e8f1ff;
  font-size: 20px;
  cursor: pointer;
  z-index: 5;
  transition: 0.25s var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
}
.carousel-prev:hover, .carousel-next:hover {
  background: rgba(53, 182, 255, 0.16);
  border-color: #7dd6ff;
  color: #7dd6ff;
  box-shadow: 0 0 22px rgba(53, 182, 255, 0.35);
}
.carousel-prev { left: 26px; }
.carousel-next { right: 26px; }
.carousel-indicators {
  position: absolute;
  bottom: 44px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}
.indicator {
  width: 26px;
  height: 3px;
  border-radius: 3px;
  background: rgba(169, 188, 224, 0.35);
  cursor: pointer;
  transition: 0.3s;
}
.indicator.active {
  background: #7dd6ff;
  box-shadow: 0 0 12px rgba(125, 214, 255, 0.8);
}

/* hero 下方三卡片（悬浮于深空边界，浅色面板） */
#home > .container {
  margin-top: -56px;
  position: relative;
  z-index: 6;
}

/* ---------- 数据面板卡片（浅色） ---------- */
.card-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  margin-top: 32px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px 30px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s var(--ease-out), border-color 0.3s, box-shadow 0.3s;
}
.card::before {
  content: attr(data-tag);
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--faint);
}
.card::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(10, 108, 241, 0.4);
  box-shadow: var(--shadow-card-hover);
}
.card:hover::after {
  opacity: 1;
}
.card h3 {
  color: var(--ink);
  margin-bottom: 12px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.card h4 {
  color: var(--blue);
  font-size: 16px;
  margin-bottom: 10px;
}
.card p {
  color: var(--muted);
  font-size: 14px;
}
.card ul {
  padding-left: 0;
  list-style: none;
}
.card ul li {
  color: var(--muted);
  font-size: 14px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--line);
}
.card ul li:last-child {
  border-bottom: none;
}
/* 两列列表 */
.card ul.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 18px;
}
.case-card .case-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--blue);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: gap 0.25s var(--ease-out);
}
.case-card .case-link:hover {
  gap: 12px;
  color: var(--ink);
}

/* ---------- Hero 双按钮（对齐参考站 CTA） ---------- */
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}
.hero-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-decoration: none;
  transition: 0.25s var(--ease-out);
  cursor: pointer;
}
.hero-cta .btn-primary {
  background: linear-gradient(92deg, #0a6cf1, #35b6ff);
  color: #fff;
  box-shadow: 0 8px 22px rgba(10, 108, 241, 0.35);
}
.hero-cta .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(10, 108, 241, 0.45);
}
.hero-cta .btn-ghost {
  background: rgba(125, 214, 255, 0.08);
  border: 1px solid rgba(125, 214, 255, 0.4);
  color: #dbeaff;
}
.hero-cta .btn-ghost:hover {
  background: rgba(53, 182, 255, 0.16);
  border-color: #5ad5ff;
  color: #fff;
}

/* ---------- 场景标签胶囊（对齐参考站演练场景标签） ---------- */
.tag-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}
.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid rgba(10, 108, 241, 0.2);
  background: linear-gradient(135deg, rgba(10, 108, 241, 0.06), rgba(53, 182, 255, 0.1));
  color: var(--blue);
  transition: 0.25s var(--ease-out);
}
.tag-pill:hover {
  border-color: var(--blue);
  background: linear-gradient(135deg, rgba(10, 108, 241, 0.12), rgba(53, 182, 255, 0.18));
  transform: translateY(-1px);
}
.tag-pill .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--blue), var(--teal));
}

.more-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  background: linear-gradient(92deg, #0a6cf1, #35b6ff);
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 6px 18px rgba(10, 108, 241, 0.28);
  transition: 0.25s var(--ease-out);
}
.more-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(10, 108, 241, 0.4);
}

/* 图标式卡片（hero 三卡 / 服务能力） */
.icon-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  text-align: left;
}
.card-icon {
  flex: none;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(10, 108, 241, 0.1), rgba(53, 182, 255, 0.18));
  border: 1px solid rgba(10, 108, 241, 0.22);
  color: var(--blue);
  margin-bottom: 4px;
  transition: 0.3s var(--ease-out);
}
.icon-card:hover .card-icon {
  transform: scale(1.08);
  box-shadow: var(--shadow-glow);
}
.icon-card h3 {
  margin-bottom: 8px;
}
.icon-card p {
  margin: 0;
}

/* 五列卡组（智能建造实训） */
.cards-5 {
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.cards-5 .card {
  padding: 24px 20px;
}
.cards-5 .card h3 {
  font-size: 16px;
}

/* ---------- 版本对比 ---------- */
.version-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 26px;
}
.version {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: 0.3s var(--ease-out);
}
.version::before {
  content: "";
  position: absolute;
  left: 0; top: 22px; bottom: 22px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--blue), var(--cyan));
  box-shadow: 0 0 12px rgba(10, 108, 241, 0.45);
}
.version:hover {
  transform: translateY(-4px);
  border-color: rgba(10, 108, 241, 0.4);
  box-shadow: var(--shadow-card-hover);
}
.version h3 {
  margin-bottom: 12px;
  color: var(--ink);
  font-size: 18px;
}
.version ul li {
  color: var(--muted);
  font-size: 14px;
  padding-left: 4px;
}

/* ---------- 新闻列表 ---------- */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 34px;
}
.news-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid rgba(10, 108, 241, 0.45);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow-card);
  transition: 0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.news-item::after {
  content: "";
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--blue), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.news-item:hover {
  transform: translateX(6px);
  border-left-color: var(--blue);
  box-shadow: var(--shadow-card-hover);
}
.news-item:hover::after {
  opacity: 1;
}
.news-date {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--faint);
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 10px;
}
.news-date::before {
  content: "";
  width: 14px; height: 1px;
  background: var(--blue);
}
.news-item h3 {
  color: var(--ink);
  margin-bottom: 10px;
  font-size: 17px;
  font-weight: 700;
}
.news-item p {
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 项目案例卡片 ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  margin-top: 36px;
}
.case-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: 0.35s var(--ease-out);
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--line-strong);
}
.case-img {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-deep);
}
.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.55s var(--ease-out);
}
.case-card:hover .case-img img {
  transform: scale(1.05);
}
.case-img::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 76px;
  background: linear-gradient(180deg, transparent, rgba(8, 28, 52, 0.55));
}
.case-tag {
  position: absolute;
  left: 16px; top: 16px;
  z-index: 1;
  background: rgba(8, 28, 52, 0.72);
  color: #e8f1ff;
  font-family: var(--font-tech);
  font-size: 12px;
  letter-spacing: 1.5px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(90, 213, 255, 0.35);
}
.case-body {
  padding: 22px 24px 26px;
}
.case-body h3 {
  color: var(--ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
}
.case-date {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--faint);
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.case-date::before {
  content: "";
  width: 14px; height: 1px;
  background: var(--blue);
}
.case-body p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.85;
}
.dyn-block {
  margin-top: 64px;
}
@media (max-width: 860px) {
  .case-grid { grid-template-columns: 1fr; }
}

/* ---------- 版本角标 / 学生端专区 ---------- */
.version .badge {
  position: absolute;
  right: 16px; top: 16px;
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 1px;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(10, 108, 241, 0.1);
  color: var(--blue);
  border: 1px solid rgba(10, 108, 241, 0.3);
}
.version .badge.hot {
  background: rgba(0, 194, 168, 0.12);
  color: var(--teal);
  border-color: rgba(0, 194, 168, 0.35);
}
.version .tagline {
  color: var(--faint);
  font-size: 13px;
  margin-bottom: 14px;
  line-height: 1.7;
}
.version .tick { color: var(--teal); }
.version .cross { color: var(--faint); opacity: 0.55; }
.stu-block {
  margin-top: 34px;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 30px;
  align-items: stretch;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.stu-media {
  min-height: 260px;
  background: var(--bg-deep);
}
.stu-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.stu-body {
  padding: 28px 28px 30px 0;
}
.stu-body h3 {
  color: var(--ink);
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 10px;
}
.stu-body .stu-role {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue);
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 14px;
}
.stu-body .stu-role::before {
  content: "";
  width: 16px; height: 2px;
  background: var(--blue);
}
.stu-body ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 18px;
  margin-top: 4px;
}
.stu-body ul li {
  color: var(--muted);
  font-size: 14px;
  padding-left: 22px;
  position: relative;
  line-height: 1.7;
}
.stu-body ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 8px;
  width: 7px; height: 7px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--cyan);
}
.stu-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.stu-tags span {
  font-size: 12px;
  color: var(--ink);
  background: rgba(10, 108, 241, 0.07);
  border: 1px solid rgba(10, 108, 241, 0.16);
  border-radius: 999px;
  padding: 5px 11px;
}
@media (max-width: 1120px) {
  .version-box { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .stu-block { grid-template-columns: 1fr; }
  .stu-body { padding: 24px 22px; }
  .stu-body ul { grid-template-columns: 1fr; }
}

/* ---------- 表单 ---------- */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-item {
  margin-bottom: 18px;
}
.form-item label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--ink);
  letter-spacing: 0.3px;
}
.red {
  color: #e5484d;
}
.form-item input,
.form-item textarea {
  width: 100%;
  background: #f8fafd;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--font-body);
  color: var(--ink);
  transition: 0.25s;
}
.form-item input::placeholder,
.form-item textarea::placeholder {
  color: var(--faint);
}
.form-item input:focus,
.form-item textarea:focus {
  border-color: var(--blue);
  outline: none;
  box-shadow: 0 0 0 3px rgba(10, 108, 241, 0.14);
  background: #fff;
}
.form-item textarea {
  min-height: 120px;
  resize: vertical;
}
.submit-btn {
  background: linear-gradient(92deg, #0a6cf1, #35b6ff);
  color: #fff;
  border: none;
  padding: 13px 36px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  box-shadow: 0 6px 18px rgba(10, 108, 241, 0.28);
  transition: 0.25s var(--ease-out);
}
.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(10, 108, 241, 0.4);
}
#formTip {
  margin-top: 12px;
  font-size: 14px;
}

/* ---------- 联系我们双栏 ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  margin-top: 34px;
}
.contact-info h3 {
  margin-bottom: 18px;
}
.contact-info ul li {
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  color: var(--muted);
  display: flex;
  gap: 8px;
}
.contact-info ul li strong {
  color: var(--ink);
  flex: none;
}
.contact-info ul li:last-child {
  border-bottom: none;
}
.contact-note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--faint);
}

/* ---------- 服务流程：深海军蓝节奏带 ---------- */
#process {
  background:
    radial-gradient(ellipse 70% 90% at 20% 15%, rgba(53, 182, 255, 0.14), transparent 60%),
    radial-gradient(ellipse 60% 80% at 85% 80%, rgba(10, 108, 241, 0.18), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, #0d2846 160px, #081c34 22%, #081c34 78%, #0d2846 calc(100% - 160px), var(--bg) 100%);
}
#process .section-title,
#process .desc {
  color: #e8f1ff;
}
#process .section-title::before {
  color: #5ad5ff;
}
#process .section-title::after {
  background: linear-gradient(90deg, #35b6ff, transparent);
}
#process .process-item {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(125, 214, 255, 0.22);
  box-shadow: 0 8px 26px rgba(4, 12, 28, 0.35);
  backdrop-filter: blur(4px);
}
#process .process-item:hover {
  border-color: rgba(125, 214, 255, 0.5);
  box-shadow: 0 14px 34px rgba(4, 12, 28, 0.45);
}
#process .process-item h3 {
  color: #e8f1ff;
}
#process .process-item p {
  color: #a9bce0;
}
#process .process-item:not(:last-child)::after {
  background: linear-gradient(90deg, #35b6ff, transparent);
}

/* ---------- 服务流程（坐标推进 + 连接线） ---------- */
.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.process-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px 28px;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: 0.3s var(--ease-out);
}
/* 流程间连接线 */
.process-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -16px;
  top: 50%;
  width: 12px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
  opacity: 0.5;
  transform: translateY(-50%);
}
.process-item:hover {
  transform: translateY(-6px);
  border-color: rgba(10, 108, 241, 0.4);
  box-shadow: var(--shadow-card-hover);
}
.process-num {
  display: block;
  font-family: var(--font-tech);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 14px;
  background: linear-gradient(120deg, var(--blue), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.process-item h3 {
  color: var(--ink);
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 700;
}
.process-item p {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: 0.3s;
  z-index: 998;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
}
.back-top.show {
  opacity: 1;
  visibility: visible;
}
.back-top:hover {
  border-color: var(--blue);
  color: var(--blue);
  box-shadow: var(--shadow-glow);
}

/* ---------- 页脚（深色保留） ---------- */
footer {
  background: var(--foot-bg);
  color: #e8f1ff;
  padding: 56px 0 0;
  margin-top: 60px;
  position: relative;
  z-index: 2;
}
footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, #4d8dff, transparent);
  opacity: 0.7;
}
.footer-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 34px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.1fr;
  gap: 34px;
  text-align: left;
}
.footer-col h4 {
  color: #fff;
  margin-bottom: 16px;
  font-size: 15px;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-col h4::before {
  content: "";
  width: 4px; height: 4px;
  transform: rotate(45deg);
  background: #4d8dff;
  box-shadow: 0 0 8px #4d8dff;
}
.footer-col p {
  font-size: 13px;
  color: #a9bce0;
  line-height: 1.9;
}
.footer-col ul li {
  font-size: 13px;
  color: #a9bce0;
  margin: 7px 0;
}
.footer-col ul li a {
  color: #a9bce0;
  text-decoration: none;
  transition: 0.2s;
}
.footer-col ul li a:hover {
  color: #7dd6ff;
}
.footer-bottom {
  border-top: 1px solid rgba(169, 188, 224, 0.14);
  padding: 18px 24px;
  text-align: center;
  font-size: 13px;
  color: #7d90b5;
}

/* ---------- 滚动显示动画（克制） ---------- */
.scroll-animate {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.scroll-animate.active {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 子页头部（浅色科技） ---------- */
.sub-hero {
  padding: 118px 0 52px;
  position: relative;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #eaf2fd, var(--bg));
}
.sub-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 90% at 15% 8%, rgba(10, 108, 241, 0.1), transparent 60%),
    radial-gradient(ellipse 60% 80% at 85% 25%, rgba(53, 182, 255, 0.08), transparent 60%);
  pointer-events: none;
}
.sub-hero .container {
  position: relative;
  z-index: 2;
}
.sub-hero h1 {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 900;
  letter-spacing: 1px;
  margin-bottom: 10px;
  color: var(--ink);
}
.sub-hero h1 .hl {
  background: linear-gradient(92deg, var(--blue) 20%, var(--cyan) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sub-hero .crumb {
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--blue);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sub-hero .crumb::before {
  content: "";
  width: 26px; height: 1px;
  background: var(--blue);
}
.sub-hero .desc {
  color: var(--muted);
  font-size: 15px;
  max-width: 720px;
}

/* ---------- 数据光带（首页数字概览） ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: 30px;
}
.stat-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: 0.3s var(--ease-out);
}
.stat-item:hover {
  border-color: rgba(10, 108, 241, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}
.stat-num {
  font-family: var(--font-tech);
  font-size: 36px;
  font-weight: 700;
  background: linear-gradient(120deg, #0a6cf1, #35b6ff 70%, #5ad5ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}
.stat-label {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 1px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-list { gap: 0; }
  .nav-list a { padding: 8px 9px; font-size: 13px; }
  .nav-wrap { padding: 0 16px; }
}
@media (max-width: 1080px) {
  .cards-5 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 920px) {
  .menu-btn { display: flex; }
  .nav-list {
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 20px 24px;
    gap: 6px;
    display: none;
    box-shadow: 0 12px 30px rgba(20, 48, 100, 0.12);
  }
  .nav-list.open { display: flex; }
  .nav-list a { padding: 12px 10px; width: 100%; font-size: 15px; color: var(--muted); }
  /* 首页移动端展开菜单：白底深字 */
  body.home header .nav-list a,
  body.home header .nav-list a.active { color: var(--muted); }
  body.home header .nav-list a.active { color: var(--blue); }
  body.home header .nav-list a:hover { color: var(--ink); background: rgba(10, 108, 241, 0.06); }
}
@media (max-width: 900px) {
  .process-list { grid-template-columns: repeat(2, 1fr); }
  .process-item:nth-child(2)::after { display: none; }
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
  .card ul.two-col { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .carousel { height: 76vh; min-height: 520px; }
  .carousel-item .container { padding-top: 13vh; }
  .banner-desc { display: none; }
  .version-box { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; }
  .footer-wrap { grid-template-columns: 1fr 1fr; gap: 26px; }
  .carousel-prev, .carousel-next { width: 38px; height: 38px; font-size: 17px; }
  .carousel-prev { left: 12px; }
  .carousel-next { right: 12px; }
  header { position: fixed; }
  .page-content { margin-top: 68px; }
  .section-title { font-size: 24px; }
}
@media (max-width: 640px) {
  .cards-5 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-wrap { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: 1fr; }
  .process-item::after { display: none; }
  .cards-5 { grid-template-columns: 1fr; }
}

/* ---------- 无障碍：减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .scroll-animate { opacity: 1; transform: none; transition: none; }
  .carousel-bg { animation: none; }
  .loader-cube, .loader-cube .face { animation: none; }
  .hero-eyebrow::before, .indicator.active { animation: none; }
  #bg-canvas { display: none; }
}

/* ---------- 板块配图 ---------- */
.section-media {
  margin: 36px 0 30px;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(10, 108, 241, 0.14);
  box-shadow: 0 18px 44px rgba(16, 35, 63, 0.14);
  position: relative;
  padding: 10px;
  background: linear-gradient(180deg, #ffffff, #eef3fa);
}
.section-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}
.section-media::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--cyan), transparent);
  opacity: 0.75;
}
/* 案例图卡 */
.card-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
}
.case-card::before {
  display: none;
}
.case-card {
  padding-top: 18px;
}
@media (max-width: 768px) {
  .section-media { margin-top: 24px; }
}

/* ---------- 智能建造卡片（图标版） ---------- */
.cards-5 {
  gap: 20px;
}
.tr-card {
  text-align: left;
  padding: 26px 22px 28px;
  display: flex;
  flex-direction: column;
}
.tr-card .card-icon {
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
}
.tr-card h3 {
  font-size: 15px;
  line-height: 1.55;
  margin-bottom: 12px;
  min-height: 46px;
  display: flex;
  align-items: flex-start;
}
.tr-card p {
  font-size: 13px;
  color: var(--muted);
  flex: 1;
}

/* ---------- 配套服务条 ---------- */
.service-strip {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 26px;
  background: linear-gradient(100deg, rgba(10, 108, 241, 0.06), rgba(53, 182, 255, 0.06));
  border: 1px solid rgba(10, 108, 241, 0.18);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}
.service-strip-icon {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(10, 166, 216, 0.14));
  border: 1px solid rgba(37, 99, 235, 0.22);
  color: var(--blue);
}
.service-strip p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}
.service-strip p strong {
  color: var(--ink);
}
@media (max-width: 1080px) {
  .cards-5 { grid-template-columns: repeat(3, 1fr); }
  .tr-card h3 { min-height: 0; }
}
@media (max-width: 640px) {
  .cards-5 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .cards-5 { grid-template-columns: 1fr; }
}

/* ============================================================
   v4 · 统一布局规范（2026-09-30）
   规范：内容区保持白色 | 上下 section 间距统一增大
        蓝/浅蓝背景通栏到屏幕边缘 | 卡片与文字容器统一对齐
   ============================================================ */

/* 1) 间距与底色 Token（去灰感，向纯净浅蓝调整） */
:root {
  --sec-pad: 104px;          /* 区块统一上下留白（桌面） */
  --sec-pad-m: 56px;         /* 区块统一上下留白（移动端） */
  --bg: #f7faff;             /* 页面主底：更纯净浅蓝白（去灰） */
  --bg-alt: #eef5ff;         /* 交替底：浅蓝（不再灰蓝） */
  --bg-deep: #e2eeff;        /* 重点区：更明显浅蓝 */
  --sec-blue: #eef5ff;       /* 浅蓝通栏 */
  --sec-blue-deep: #e2eeff;  /* 重点浅蓝通栏 */
}

/* 2) 容器统一对齐：导航 / 内容 / 页脚同一宽度（左右边缘完全对齐） */
.nav-wrap {
  max-width: 1200px;
}

/* 3) 区块：上下间距统一增大，背景通栏 */
section {
  padding: var(--sec-pad) 0;
}

/* 4) 显式通栏背景类（优先级高于旧 nth-of-type 规则） */
section.sec-white {
  background: #ffffff;
}
section.sec-blue {
  background:
    radial-gradient(ellipse 80% 60% at 85% 0%, rgba(53, 182, 255, 0.06), transparent 55%),
    var(--sec-blue);
}
section.sec-blue-deep {
  background:
    radial-gradient(ellipse 70% 60% at 12% 8%, rgba(10, 108, 241, 0.07), transparent 55%),
    radial-gradient(ellipse 60% 60% at 90% 30%, rgba(53, 182, 255, 0.08), transparent 55%),
    var(--sec-blue-deep);
}

/* 5) 重点产品区：统一为浅蓝通栏（覆盖旧的灰蓝渐变） */
#xiaoanyun, #smart-build {
  background:
    radial-gradient(ellipse 70% 60% at 12% 8%, rgba(10, 108, 241, 0.07), transparent 55%),
    radial-gradient(ellipse 60% 60% at 90% 30%, rgba(53, 182, 255, 0.08), transparent 55%),
    var(--sec-blue-deep);
}

/* 6) 关闭旧 nth-of-type 奇偶灰蓝交替的分隔光 */
section:nth-of-type(even)::before {
  display: none;
}

/* 7) 子页内容区：背景交给通栏类，内容区保持白色 */
.page-content {
  background: none !important;
}

/* 8) 移动端：间距收拢但保持统一 */
@media (max-width: 768px) {
  section {
    padding: var(--sec-pad-m) 0;
  }
}