/**
 * 长护云官网 - 全站样式
 * 设计规范：
 *  - 主色调：深藏青 #0B1B3B / 科技蓝 #1E5AF0 / 白色，点缀清新绿 #2ECC8F
 *  - 字体：PingFang SC / Microsoft YaHei / Noto Sans SC（无衬线）
 *  - 动效：滚动渐现、数字滚动、背景线条流动（克制优雅，优先 transform/opacity）
 */

/* ==================== 1. 变量与基础重置 ==================== */
:root {
  --navy: #0B1B3B;          /* 深藏青（主色） */
  --navy-2: #102450;        /* 深藏青-浅一档 */
  --navy-3: #0A1530;        /* 深藏青-深一档（页脚/深底） */
  --blue: #1E5AF0;          /* 科技蓝（强调色） */
  --blue-light: #4D7FFF;    /* 科技蓝-亮 */
  --green: #2ECC8F;         /* 清新绿（健康/安全提示） */
  --text: #1F2A44;          /* 正文主色 */
  --text-light: #5A6B8C;    /* 正文次要色 */
  --bg: #FFFFFF;
  --bg-soft: #F5F8FD;       /* 浅色区块底 */
  --border: #E3EAF6;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(11, 27, 59, 0.08);
  --shadow-hover: 0 20px 56px rgba(30, 90, 240, 0.16);
  --header-h: 72px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }

ul, ol, li { list-style: none; }

strong { color: var(--blue); font-weight: 700; }

/* 锚点定位时为吸顶导航预留高度 */
section[id] { scroll-margin-top: calc(var(--header-h) + 12px); }

/* ==================== 2. 通用工具 ==================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; }

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--blue);
  background: rgba(30, 90, 240, 0.08);
  border: 1px solid rgba(30, 90, 240, 0.18);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 16px;
  font-weight: 600;
}

.section-title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
  letter-spacing: 0.5px;
}

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

.sub-title {
  margin: 56px 0 24px;
  font-size: 22px;
  color: var(--navy);
  text-align: center;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-light) 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(30, 90, 240, 0.35);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(30, 90, 240, 0.45); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.16); border-color: #fff; }

.btn-lg { padding: 14px 36px; font-size: 16px; }

/* ==================== 3. 滚动渐显动效 ==================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.6, 0.2, 1), transform 0.7s cubic-bezier(0.2, 0.6, 0.2, 1);
  will-change: opacity, transform;
}
.reveal.visible { opacity: 1; transform: none; }

/* 网格子项交错延迟 */
.province-grid > .reveal:nth-child(2n) { transition-delay: 0.08s; }
.province-grid > .reveal:nth-child(3n) { transition-delay: 0.16s; }
.solution-grid > .reveal:nth-child(2) { transition-delay: 0.1s; }
.solution-grid > .reveal:nth-child(3) { transition-delay: 0.2s; }
.solution-grid > .reveal:nth-child(4) { transition-delay: 0.3s; }
.pain-grid > .reveal:nth-child(2) { transition-delay: 0.12s; }
.pain-grid > .reveal:nth-child(3) { transition-delay: 0.24s; }
.tech-grid > .reveal:nth-child(2) { transition-delay: 0.1s; }
.tech-grid > .reveal:nth-child(3) { transition-delay: 0.2s; }
.tech-grid > .reveal:nth-child(4) { transition-delay: 0.3s; }
.stats-grid > .reveal:nth-child(2) { transition-delay: 0.1s; }
.stats-grid > .reveal:nth-child(3) { transition-delay: 0.2s; }
.stats-grid > .reveal:nth-child(4) { transition-delay: 0.3s; }

/* 用户偏好减少动效时全部直接显示 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ==================== 4. 顶部导航 ==================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-h);
  transition: background 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}

/* 滚动后吸顶：半透明深色 + 模糊 */
.site-header.scrolled {
  background: rgba(11, 27, 59, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand-logo { width: 38px; height: 38px; flex-shrink: 0; }

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 2px;
}

.brand-sub {
  font-size: 10px;
  letter-spacing: 3px;
  color: rgba(255, 255, 255, 0.55);
}

.site-nav { display: flex; align-items: center; gap: 6px; }

.nav-link {
  position: relative;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  transition: color 0.25s ease, background 0.25s ease;
}
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.nav-link.active { color: #fff; }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), var(--green));
}

.nav-cta { margin-left: 10px; padding: 9px 22px; }

/* 汉堡按钮（移动端） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  margin: 0 auto;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==================== 5. 首屏 Banner ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: #fff;
  background: var(--navy);
}

/* 背景大图 + 蓝色渐变遮罩 */
.hero-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(160deg, rgba(11, 27, 59, 0.92) 0%, rgba(11, 27, 59, 0.72) 45%, rgba(30, 90, 240, 0.45) 100%),
    url("https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=Modern%20smart%20city%20skyline%20at%20dusk%20with%20glowing%20blue%20digital%20network%20connection%20lines%20and%20data%20particles%2C%20healthcare%20technology%20concept%2C%20deep%20navy%20blue%20color%20tones%2C%20clean%20futuristic%20corporate%20style%2C%20wide%20panoramic%20view&image_size=landscape_16_9");
  background-size: cover;
  background-position: center;
  animation: heroZoom 18s ease-out forwards;
}
@keyframes heroZoom {
  from { transform: scale(1.08); }
  to { transform: scale(1); }
}

/* 轻量网格线条（流动感） */
.hero-grid {
  position: absolute; inset: -1px;
  background-image:
    linear-gradient(rgba(77, 127, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(77, 127, 255, 0.12) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 45%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 45%, #000 30%, transparent 75%);
  animation: gridFlow 24s linear infinite;
}
@keyframes gridFlow {
  from { background-position: 0 0, 0 0; }
  to { background-position: 64px 64px, 64px 64px; }
}

/* 漂浮粒子 */
.hero-particles span {
  position: absolute;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: rgba(77, 127, 255, 0.55);
  box-shadow: 0 0 12px rgba(77, 127, 255, 0.8);
  opacity: 0;
  animation: floatUp 12s linear infinite;
}
.hero-particles span:nth-child(1) { left: 12%; bottom: 8%; animation-delay: 0s; }
.hero-particles span:nth-child(2) { left: 28%; bottom: 4%; animation-delay: 2.4s; width: 4px; height: 4px; }
.hero-particles span:nth-child(3) { left: 45%; bottom: 10%; animation-delay: 4.8s; }
.hero-particles span:nth-child(4) { left: 62%; bottom: 5%; animation-delay: 1.8s; width: 4px; height: 4px; }
.hero-particles span:nth-child(5) { left: 78%; bottom: 12%; animation-delay: 3.6s; }
.hero-particles span:nth-child(6) { left: 88%; bottom: 6%; animation-delay: 6s; width: 4px; height: 4px; }
.hero-particles span:nth-child(7) { left: 8%;  bottom: 18%; animation-delay: 7.2s; width: 4px; height: 4px; }
.hero-particles span:nth-child(8) { left: 70%; bottom: 20%; animation-delay: 8.4s; }
@keyframes floatUp {
  0% { opacity: 0; transform: translateY(0); }
  12% { opacity: 0.9; }
  85% { opacity: 0.35; }
  100% { opacity: 0; transform: translateY(-52vh); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-top: var(--header-h);
}

.hero-badge {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 2px;
  color: #CFE0FF;
  border: 1px solid rgba(160, 190, 255, 0.4);
  background: rgba(30, 90, 240, 0.18);
  border-radius: 999px;
  padding: 6px 18px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(32px, 5.6vw, 58px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: 1px;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(90deg, #5B8CFF, var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 22px;
  font-size: clamp(15px, 2vw, 19px);
  color: rgba(255, 255, 255, 0.78);
  letter-spacing: 1px;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* 向下滚动指示 */
.hero-scroll {
  position: absolute;
  left: 50%; bottom: 30px;
  transform: translateX(-50%);
  z-index: 2;
  padding: 8px;
}
.hero-scroll-mouse {
  display: block;
  width: 24px; height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: 14px;
  position: relative;
}
.hero-scroll-mouse::after {
  content: "";
  position: absolute;
  left: 50%; top: 7px;
  width: 4px; height: 8px;
  margin-left: -2px;
  border-radius: 2px;
  background: var(--green);
  animation: scrollHint 1.8s ease-in-out infinite;
}
@keyframes scrollHint {
  0%, 100% { transform: translateY(0); opacity: 1; }
  60% { transform: translateY(12px); opacity: 0.2; }
}

/* ==================== 6. 数据概览条 ==================== */
.stats {
  background: linear-gradient(180deg, var(--navy-3) 0%, var(--navy) 100%);
  padding: 64px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat + .stat { border-left: 1px solid rgba(255, 255, 255, 0.1); }

.stat-number {
  font-size: clamp(34px, 4.6vw, 52px);
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.stat-number .suffix {
  font-size: 0.55em;
  font-weight: 700;
  color: var(--green);
  margin-left: 2px;
}

.stat-label {
  margin-top: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.66);
}

/* ==================== 7. 政策背景 ==================== */
.policy { background: var(--bg-soft); }

.policy-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.policy-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.policy-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

.policy-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(30, 90, 240, 0.12), rgba(46, 204, 143, 0.12));
  color: var(--blue);
  margin-bottom: 18px;
}
.policy-icon svg { width: 28px; height: 28px; }

.policy-card h3 { font-size: 19px; color: var(--navy); margin-bottom: 10px; }
.policy-card p { color: var(--text-light); font-size: 15px; }

/* 流程步骤 */
.policy-flow {
  margin-top: 40px;
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.flow-step {
  flex: 1 1 200px;
  max-width: 240px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  position: relative;
}
.flow-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--green);
  letter-spacing: 2px;
}
.flow-step h4 { margin-top: 6px; font-size: 17px; color: var(--navy); }
.flow-step p { margin-top: 6px; font-size: 13px; color: var(--text-light); }

.flow-arrow {
  align-self: center;
  color: var(--blue);
  font-size: 22px;
  font-weight: 700;
  flex: 0 0 auto;
}

/* 省市数据卡片 */
.province-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.province-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.province-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(30, 90, 240, 0.35); }

.province-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border);
}

.province-name { font-size: 17px; font-weight: 700; color: var(--navy); }

.province-badge {
  font-size: 11px;
  color: var(--blue);
  background: rgba(30, 90, 240, 0.08);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}

.province-card ul li {
  font-size: 14px;
  color: var(--text-light);
  padding: 3px 0;
}

/* 全国卡高亮 */
.province-card.highlight {
  background: linear-gradient(150deg, var(--navy) 0%, var(--navy-2) 100%);
  border-color: transparent;
}
.province-card.highlight .province-name,
.province-card.highlight ul li { color: #fff; }
.province-card.highlight ul li strong { color: var(--green); }
.province-card.highlight header { border-bottom-color: rgba(255, 255, 255, 0.18); }
.province-card.highlight .province-badge {
  color: var(--green);
  background: rgba(46, 204, 143, 0.14);
}

.data-note {
  margin-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #98A6C0;
}

/* ==================== 8. 行业痛点 ==================== */
.pain { background: #fff; }

.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pain-card {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px 30px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.pain-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }

.pain-num {
  position: absolute;
  top: -14px; right: 8px;
  font-size: 84px;
  font-weight: 800;
  color: rgba(30, 90, 240, 0.07);
  line-height: 1;
  user-select: none;
}

.pain-card h3 {
  font-size: 18px;
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.55;
  position: relative;
}
.pain-card p { font-size: 15px; color: var(--text-light); position: relative; }

/* ==================== 9. 解决方案 ==================== */
.solution {
  background:
    radial-gradient(ellipse 60% 40% at 85% 0%, rgba(30, 90, 240, 0.06), transparent),
    var(--navy);
  color: #fff;
}
.solution .section-title { color: #fff; }
.solution .section-desc { color: rgba(255, 255, 255, 0.65); }
.solution .section-tag {
  color: #9DBAFF;
  background: rgba(30, 90, 240, 0.2);
  border-color: rgba(120, 160, 255, 0.35);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.solution-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 30px 24px;
  transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease;
}
.solution-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(120, 160, 255, 0.45);
}

.solution-icon {
  width: 54px; height: 54px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(30, 90, 240, 0.35), rgba(46, 204, 143, 0.25));
  color: #BFD2FF;
  margin-bottom: 18px;
}
.solution-icon svg { width: 30px; height: 30px; }

.solution-card h3 { font-size: 18px; margin-bottom: 6px; }

.solution-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--green);
  background: rgba(46, 204, 143, 0.12);
  border-radius: 999px;
  padding: 2px 10px;
  margin-bottom: 12px;
}

.solution-card p { font-size: 14px; color: rgba(255, 255, 255, 0.68); }

/* ==================== 10. 核心竞争优势 ==================== */
.tech { background: #fff; }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.tech-card {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 26px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.tech-card::before {
  content: "";
  position: absolute;
  top: 0; left: 26px;
  width: 44px; height: 4px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, var(--blue), var(--green));
}
.tech-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); background: #fff; }

.tech-card h3 { font-size: 19px; color: var(--navy); margin-bottom: 10px; }
.tech-card p { font-size: 15px; color: var(--text-light); }

/* ==================== 11. 商业模式 ==================== */
.business { background: var(--bg-soft); }

.business-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.business-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.business-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

.business-card h3 { font-size: 21px; color: var(--navy); margin-bottom: 8px; }
.business-desc { color: var(--text-light); font-size: 15px; margin-bottom: 22px; }

.business-data {
  display: flex;
  gap: 40px;
  margin-bottom: 24px;
}
.business-data dt { font-size: 13px; color: var(--text-light); }
.business-data dd {
  font-size: 30px;
  font-weight: 800;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}
.business-data dd small { font-size: 13px; font-weight: 500; color: var(--text-light); margin-left: 3px; }

/* 纯 CSS 毛利率环形图 */
.donut-wrap { display: flex; justify-content: flex-start; }
.donut {
  width: 132px; height: 132px;
  border-radius: 50%;
  background: conic-gradient(var(--green) 0 46.7%, #E6EDF8 46.7% 100%);
  display: flex; align-items: center; justify-content: center;
}
.donut-center {
  width: 96px; height: 96px;
  border-radius: 50%;
  background: #fff;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  line-height: 1.3;
}
.donut-center strong { font-size: 22px; color: var(--navy); }
.donut-center em { font-style: normal; font-size: 12px; color: var(--text-light); }

/* SaaS 列表 */
.saas-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.saas-list li {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px 14px 40px;
  font-size: 15px;
  color: var(--text);
  font-weight: 500;
}
.saas-list li::before {
  content: "";
  position: absolute;
  left: 16px; top: 50%;
  width: 9px; height: 9px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(46, 204, 143, 0.18);
}

/* ==================== 12. 业务拓展 ==================== */
.expand { background: #fff; }

.expand-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 24px;
  align-items: start;
}

.expand-group > h3 {
  font-size: 18px;
  color: var(--navy);
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid var(--green);
  line-height: 1.4;
}

.expand-items { display: grid; gap: 14px; }
.expand-group:first-child .expand-items { grid-template-columns: repeat(3, 1fr); }

.expand-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.expand-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(30, 90, 240, 0.35); }
.expand-card h4 { font-size: 16px; color: var(--navy); margin-bottom: 6px; }
.expand-card p { font-size: 13.5px; color: var(--text-light); }

/* ==================== 13. 落地路径（时间轴） ==================== */
.roadmap { background: var(--navy); color: #fff; }
.roadmap .section-title { color: #fff; }
.roadmap .section-tag {
  color: #9DBAFF;
  background: rgba(30, 90, 240, 0.2);
  border-color: rgba(120, 160, 255, 0.35);
}

.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  counter-reset: stage;
  padding-top: 12px;
}
/* 横向连接线 */
.timeline::before {
  content: "";
  position: absolute;
  top: 22px; left: 8%; right: 8%;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--green));
  opacity: 0.5;
}

.timeline-item { position: relative; padding-top: 44px; }

.timeline-item::before {
  counter-increment: stage;
  content: counter(stage);
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--navy-2);
  border: 2px solid var(--blue);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 6px rgba(30, 90, 240, 0.15);
  z-index: 1;
}

.timeline-phase {
  display: block;
  text-align: center;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-item h3 {
  text-align: center;
  font-size: 19px;
  margin-bottom: 10px;
}

.timeline-item p {
  text-align: center;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.68);
  max-width: 300px;
  margin: 0 auto;
}

/* ==================== 14. 合作伙伴（按城市分组 + 无缝滚动） ==================== */
.partner { background: var(--bg-soft); overflow: hidden; }

/* 城市分组容器 */
.city-block { margin-bottom: 28px; }

/* 城市标题行 */
.city-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 14px;
  letter-spacing: 1.5px;
}
.city-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue);
  background: rgba(30, 90, 240, 0.08);
  border: 1px solid rgba(30, 90, 240, 0.2);
  border-radius: 999px;
  padding: 2px 10px;
  letter-spacing: 0;
}

/* 双家城市：两城市并排 */
.city-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

/* 单家城市：四列网格 */
.city-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

/* 静态卡片容器（2家并排或单张居中） */
.partner-static {
  display: flex;
  gap: 22px;
}
.partner-static .partner-card { flex: 1; width: auto; }

/* 滚动容器：左右淡出遮罩，视觉更柔和 */
.marquee {
  position: relative;
  overflow: hidden;
  padding: 6px 0 10px;
  mask-image: linear-gradient(90deg, transparent 0, #000 6%, #000 94%, transparent 100%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 6%, #000 94%, transparent 100%);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marqueeScroll 32s linear infinite;
}

/* 鼠标悬停暂停，方便查看 */
.marquee:hover .marquee-track { animation-play-state: paused; }

@keyframes marqueeScroll {
  from { transform: translateX(0); }
  /* 两组列表循环位移 -50% 实现无缝衔接 */
  to { transform: translateX(-50%); }
}

.marquee-group {
  display: flex;
  gap: 22px;
  padding-right: 22px; /* 组间距 = 卡片间距，保证循环处均匀 */
}

.partner-card {
  width: 320px;
  flex-shrink: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px 24px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.partner-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(30, 90, 240, 0.35); }
.partner-card h3 {
  font-size: 18px;
  color: var(--navy);
  letter-spacing: 1px;
  margin-bottom: 8px;
  line-height: 1.5;
}
.partner-card p { font-size: 13.5px; color: var(--text-light); }

.partner-date {
  display: inline-block;
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--green);
  background: rgba(46, 204, 143, 0.1);
  border: 1px solid rgba(46, 204, 143, 0.25);
  border-radius: 999px;
  padding: 3px 14px;
  font-variant-numeric: tabular-nums;
}

/* 减少动效偏好：停止滚动，直接平铺展示 */
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; flex-wrap: wrap; width: auto; justify-content: center; }
  .marquee-group[aria-hidden="true"] { display: none; }
  .marquee { mask-image: none; -webkit-mask-image: none; }
}

/* 响应式：平板 */
@media (max-width: 1024px) {
  .city-pair { grid-template-columns: 1fr; }
  .city-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 响应式：手机 */
@media (max-width: 560px) {
  .city-grid { grid-template-columns: 1fr; }
  .partner-static { flex-direction: column; }
  .partner-card { width: 268px; padding: 24px 18px 20px; }
}

/* ==================== 15. 关于我们 ==================== */
.about { background: #fff; }

.about-intro {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 40px;
  align-items: center;
}

.about-text h3 { font-size: 21px; color: var(--navy); margin-bottom: 16px; }
.about-text p { color: var(--text-light); font-size: 15.5px; margin-bottom: 12px; text-align: justify; }

.about-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.about-figure img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }

/* 使命愿景 */
.mv-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.mv-card {
  background: linear-gradient(150deg, var(--navy) 0%, var(--navy-2) 100%);
  border-radius: var(--radius);
  padding: 32px 30px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.mv-card::after {
  content: "";
  position: absolute;
  right: -30px; bottom: -30px;
  width: 130px; height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 204, 143, 0.25), transparent 70%);
}
.mv-card h3 {
  font-size: 15px;
  letter-spacing: 4px;
  color: var(--green);
  margin-bottom: 10px;
}
.mv-card p { font-size: 19px; font-weight: 600; line-height: 1.6; }

/* 团队 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 860px;
  margin: 0 auto;
}

.team-card {
  text-align: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 22px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.team-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }

.team-card img {
  width: 108px; height: 108px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid rgba(30, 90, 240, 0.25);
  box-shadow: 0 6px 18px rgba(11, 27, 59, 0.12);
}

.team-card h4 { font-size: 18px; color: var(--navy); }
.team-card p { font-size: 14px; color: var(--text-light); margin-top: 4px; }

/* ==================== 16. 联系我们 ==================== */
.contact {
  background:
    radial-gradient(ellipse 55% 60% at 90% 20%, rgba(30, 90, 240, 0.12), transparent),
    var(--bg-soft);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
}

.contact-info .section-title { text-align: left; margin-bottom: 0; }
.contact-info .section-tag { margin-bottom: 12px; }
.contact-info .section-desc { margin: 14px 0 28px; }

.contact-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 15.5px;
}

.contact-label {
  flex: 0 0 52px;
  font-size: 13px;
  color: var(--text-light);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  padding: 3px 0;
}

.contact-list a { color: var(--blue); font-weight: 500; }
.contact-list a:hover { text-decoration: underline; }

.contact-qr {
  justify-self: center;
  text-align: center;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 20px;
  box-shadow: var(--shadow);
}
.contact-qr img {
  width: 180px; height: 180px;
  border-radius: 10px;
  object-fit: cover;
}
.contact-qr p { margin-top: 12px; font-size: 14px; color: var(--text-light); }

/* ==================== 17. 页脚 ==================== */
.site-footer {
  background: var(--navy-3);
  color: rgba(255, 255, 255, 0.62);
  text-align: center;
  padding: 34px 0;
  font-size: 14px;
}

.footer-brand { color: rgba(255, 255, 255, 0.85); font-weight: 600; letter-spacing: 1px; }
.footer-copy { margin-top: 8px; }
.footer-icp { margin-top: 8px; }
.footer-icp a { color: rgba(255, 255, 255, 0.6); text-decoration: none; font-size: 13px; }
.footer-icp a:hover { color: rgba(255, 255, 255, 0.9); text-decoration: underline; }
.footer-note { margin-top: 8px; font-size: 12.5px; color: rgba(255, 255, 255, 0.4); }

/* ==================== 18. 返回顶部 ==================== */
.back-top {
  position: fixed;
  right: 26px; bottom: 30px;
  z-index: 900;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--blue), var(--blue-light));
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(30, 90, 240, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { transform: translateY(-3px); }

/* ==================== 19. 响应式 ==================== */
@media (max-width: 1024px) {
  .section { padding: 72px 0; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .stat + .stat { border-left: none; }

  .province-grid { grid-template-columns: repeat(3, 1fr); }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .policy-cards { grid-template-columns: 1fr; }

  .expand-grid { grid-template-columns: 1fr; }
  .expand-group:first-child .expand-items { grid-template-columns: repeat(3, 1fr); }

  .about-intro { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 32px; }
  .contact-info .section-title { text-align: center; }
  .contact-list { max-width: 520px; margin: 0 auto; }
}

@media (max-width: 768px) {
  /* 移动端抽屉菜单 */
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: 0; right: 0;
    width: min(78vw, 320px);
    height: 100vh;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: calc(var(--header-h) + 24px) 28px 40px;
    background: rgba(11, 27, 59, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.2, 0.7, 0.3, 1);
    box-shadow: -12px 0 40px rgba(0, 0, 0, 0.3);
    z-index: 1000;
  }
  .site-nav.open { transform: translateX(0); }
  .site-nav .nav-link { width: 100%; padding: 13px 10px; font-size: 16px; border-radius: 10px; }
  .site-nav .nav-link.active::after { display: none; }
  .site-nav .nav-link.active { background: rgba(30, 90, 240, 0.22); }
  .nav-cta { margin: 18px 0 0; width: 100%; }

  .hero { min-height: 88vh; }
  .hero-actions .btn { width: min(240px, 80%); }

  .business-grid { grid-template-columns: 1fr; }
  .mv-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; max-width: 380px; }

  /* 时间轴改纵向 */
  .timeline { grid-template-columns: 1fr; gap: 44px; }
  .timeline::before {
    top: 10px; bottom: 10px; left: 22px; right: auto;
    width: 2px; height: auto;
    background: linear-gradient(180deg, var(--blue), var(--green));
  }
  .timeline-item { padding-top: 0; padding-left: 64px; }
  .timeline-item::before { left: 0; top: 0; transform: none; }
  .timeline-phase { text-align: left; }
  .timeline-item h3, .timeline-item p { text-align: left; margin: 0; }

  .expand-group:first-child .expand-items { grid-template-columns: 1fr; }
  .flow-arrow { display: none; }
  .policy-flow { flex-direction: column; align-items: stretch; }
  .flow-step { max-width: none; }
}

@media (max-width: 560px) {
  .container { padding: 0 18px; }
  .section { padding: 60px 0; }

  .stats-grid { grid-template-columns: 1fr 1fr; gap: 24px 16px; }
  .stat-number { font-size: 30px; }
  .stat-label { font-size: 12.5px; }

  .province-grid { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .pain-grid { grid-template-columns: 1fr; }
  /* 移动端滚动卡片适当收窄，一屏可见约 1.2 张 */
  .partner-card { width: 268px; padding: 24px 18px 20px; }
  .saas-list { grid-template-columns: 1fr; }
  .business-data { gap: 24px; }

  .contact-qr { padding: 22px 22px 16px; }
  .contact-qr img { width: 150px; height: 150px; }

  .back-top { right: 16px; bottom: 20px; width: 42px; height: 42px; }
}