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

:root {
  --primary: #1a5cd6;
  --primary-dark: #0e3a8f;
  --primary-light: #e8eefb;
  --accent: #00c9a7;
  --orange: #f0882a;
  --purple: #6366f1;
  --pink: #e74c6f;
  --text: #2c3e50;
  --text-light: #6b7c93;
  --bg: #ffffff;
  --bg-light: #f6f8fc;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
}

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

/* ===== 通用按钮 ===== */
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 92, 214, 0.35);
}

/* ===== 导航栏 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.logo-img {
  height: 40px;
  width: auto;
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
}

.nav {
  display: flex;
  gap: 8px;
}

.nav a {
  padding: 8px 16px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 6px;
  transition: all var(--transition);
}

.nav a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

/* 导航下拉菜单 */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.dropdown-arrow {
  font-size: 0.75rem;
  transition: transform var(--transition);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  border: 1px solid #e8ecf1;
  min-width: 180px;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 100;
}

.nav-dropdown-menu::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 12px;
  height: 12px;
  background: #fff;
  border-top: 1px solid #e8ecf1;
  border-left: 1px solid #e8ecf1;
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.nav-dropdown-menu a {
  display: block;
  padding: 10px 20px;
  color: var(--text);
  font-size: 0.93rem;
  font-weight: 500;
  white-space: nowrap;
  border-radius: 0;
  transition: all var(--transition);
}

.nav-dropdown-menu a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

/* 移动端汉堡菜单 */
.nav-toggle {
  display: none;
}

.nav-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-label span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 主横幅 ===== */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, #0b2a6e 0%, #1a5cd6 50%, #2563eb 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero-decor {
  position: absolute;
  border-radius: 50%;
  opacity: 0.07;
  pointer-events: none;
}

.hero-decor-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #fff 0%, transparent 70%);
  top: -200px;
  right: -100px;
  animation: float-slow 12s ease-in-out infinite;
}

.hero-decor-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  bottom: -100px;
  left: -80px;
  animation: float-slow 10s ease-in-out infinite reverse;
}

.hero-decor-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--orange) 0%, transparent 70%);
  top: 40%;
  left: 55%;
  animation: float-slow 14s ease-in-out infinite;
}

@keyframes float-slow {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -20px); }
}

.hero-grid-lines {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: space-evenly;
  pointer-events: none;
  opacity: 0.04;
}

.hero-grid-lines span {
  width: 1px;
  height: 100%;
  background: #fff;
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  padding-top: 20px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 24px;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: 4px;
  line-height: 1.3;
}

.hero-eng-logo {
  display: block;
  height: 32px;
  width: auto;
  margin-top: 10px;
  opacity: 0.6;
  filter: brightness(2);
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.95;
  margin-bottom: 10px;
}

.hero-desc {
  font-size: 1rem;
  opacity: 0.8;
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  background: #fff;
  color: var(--primary);
  font-size: 1.05rem;
}

.btn-hero-primary:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

.btn-hero-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.4);
  font-size: 1.05rem;
  padding: 12px 34px;
}

.btn-hero-outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.hero-tags {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-tag {
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  font-size: 0.85rem;
  opacity: 0.85;
}

/* ===== 主横幅右侧抽象插图 ===== */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  width: 420px;
  height: 420px;
  position: relative;
}

.illustration-ring {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, 0.15);
}

.ring-outer {
  width: 420px;
  height: 420px;
  top: 0;
  left: 0;
  animation: ring-pulse 4s ease-in-out infinite;
}

.ring-middle {
  width: 280px;
  height: 280px;
  top: 70px;
  left: 70px;
  border-color: rgba(255, 255, 255, 0.2);
  animation: ring-pulse 4s ease-in-out 0.5s infinite;
}

.ring-inner {
  width: 140px;
  height: 140px;
  top: 140px;
  left: 140px;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.04);
  animation: ring-pulse 4s ease-in-out 1s infinite;
}

@keyframes ring-pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.03); }
}

.illustration-dot {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px rgba(0, 201, 167, 0.5);
}

.dot-center {
  width: 22px;
  height: 22px;
  top: 199px;
  left: 199px;
  background: #fff;
  box-shadow: 0 0 28px rgba(255, 255, 255, 0.6);
  animation: dot-glow 2s ease-in-out infinite;
}

@keyframes dot-glow {
  0%, 100% { box-shadow: 0 0 28px rgba(255, 255, 255, 0.6); }
  50% { box-shadow: 0 0 44px rgba(255, 255, 255, 0.9), 0 0 8px rgba(255,255,255,1); }
}

.dot-1 {
  top: 70px;
  left: 290px;
  animation: blink 2s ease-in-out infinite;
}

.dot-2 {
  top: 310px;
  left: 80px;
  animation: blink 2s ease-in-out 0.7s infinite;
}

.dot-3 {
  top: 220px;
  left: 360px;
  width: 10px;
  height: 10px;
  background: var(--orange);
  box-shadow: 0 0 12px rgba(240, 136, 42, 0.5);
  animation: blink 2s ease-in-out 1.4s infinite;
}

.dot-4 {
  top: 360px;
  left: 240px;
  width: 12px;
  height: 12px;
  background: var(--purple);
  box-shadow: 0 0 14px rgba(99, 102, 241, 0.5);
  animation: blink 2s ease-in-out 0.3s infinite;
}

.dot-5 {
  top: 120px;
  left: 130px;
  width: 10px;
  height: 10px;
  background: var(--pink);
  box-shadow: 0 0 12px rgba(231, 76, 111, 0.5);
  animation: blink 2s ease-in-out 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.illustration-line {
  position: absolute;
  height: 1.5px;
  background: linear-gradient(90deg, rgba(255,255,255,0.05), rgba(255,255,255,0.25), rgba(255,255,255,0.05));
  transform-origin: left center;
}

.line-1 {
  width: 200px;
  top: 207px;
  left: 210px;
  transform: rotate(-25deg);
}

.line-2 {
  width: 170px;
  top: 316px;
  left: 87px;
  transform: rotate(-55deg);
}

.line-3 {
  width: 130px;
  top: 225px;
  left: 220px;
  transform: rotate(15deg);
}

.line-4 {
  width: 110px;
  top: 365px;
  left: 246px;
  transform: rotate(45deg);
}

/* 轨迹弧线 */
.illustration-arc {
  position: absolute;
  border-radius: 50%;
  border: 2px solid transparent;
}

.arc-1 {
  width: 200px;
  height: 200px;
  top: 110px;
  left: 160px;
  border-top-color: rgba(0, 201, 167, 0.35);
  border-right-color: rgba(0, 201, 167, 0.15);
  animation: spin-slow 20s linear infinite;
}

.arc-2 {
  width: 160px;
  height: 160px;
  top: 80px;
  left: 200px;
  border-bottom-color: rgba(240, 136, 42, 0.3);
  border-left-color: rgba(240, 136, 42, 0.12);
  animation: spin-slow 16s linear infinite reverse;
}

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

/* 浮动卡片 */
.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  padding: 12px 16px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  white-space: nowrap;
}

.float-card strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
}

.float-card small {
  display: block;
  font-size: 0.72rem;
  opacity: 0.7;
}

.float-icon {
  font-size: 1.3rem;
}

.float-card-1 {
  top: 30px;
  right: 10px;
  animation: card-float 6s ease-in-out infinite;
}

.float-card-2 {
  bottom: 40px;
  left: 0;
  animation: card-float 6s ease-in-out 1.5s infinite;
}

.float-card-3 {
  bottom: 140px;
  right: -10px;
  animation: card-float 6s ease-in-out 3s infinite;
}

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

/* ===== 亮点数据条 ===== */
.highlights {
  background: var(--bg);
  border-bottom: 1px solid #eef1f6;
}

.highlights-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.highlight-item {
  text-align: center;
  padding: 40px 16px;
  position: relative;
}

.highlight-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 25%;
  height: 50%;
  width: 1px;
  background: #e8ecf1;
}

.highlight-icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--primary-light);
  border-radius: 14px;
  margin-bottom: 14px;
}

.highlight-svg {
  width: 30px;
  height: 30px;
  color: var(--primary);
}

.highlight-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.highlight-label {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* ===== 通用区块 ===== */
.section {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 56px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* ===== 关于我们 ===== */
.about {
  background: var(--bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.9;
}

.about-right {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* 关于我们 - 物联网网络拓扑插图 */
.about-illustration {
  position: relative;
  width: 100%;
  height: 200px;
}

.about-illust-node {
  position: absolute;
}

.about-illust-node .node-svg {
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.12));
}

.node-center {
  top: 76px;
  left: calc(50% - 28px);
  z-index: 2;
}

.node-center .node-svg {
  width: 56px;
  height: 56px;
}

.node-1 {
  top: 10px;
  left: 15%;
  animation: node-bob 4s ease-in-out infinite;
}

.node-2 {
  top: 10px;
  right: 15%;
  animation: node-bob 4s ease-in-out 1s infinite;
}

.node-3 {
  bottom: 10px;
  left: 20%;
  animation: node-bob 4s ease-in-out 2s infinite;
}

.node-4 {
  bottom: 10px;
  right: 20%;
  animation: node-bob 4s ease-in-out 3s infinite;
}

@keyframes node-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.about-illust-line {
  position: absolute;
  background: linear-gradient(90deg, transparent, #c8d6e8, transparent);
  height: 2px;
  transform-origin: left center;
  z-index: 1;
}

.aline-1 {
  width: 130px;
  top: 96px;
  left: calc(15% + 30px);
  transform: rotate(-28deg);
}

.aline-2 {
  width: 130px;
  top: 96px;
  right: calc(15% + 30px);
  transform: rotate(28deg);
  transform-origin: right center;
}

.aline-3 {
  width: 120px;
  top: 110px;
  left: calc(20% + 20px);
  transform: rotate(28deg);
}

.aline-4 {
  width: 120px;
  top: 110px;
  right: calc(20% + 20px);
  transform: rotate(-28deg);
  transform-origin: right center;
}

/* 脉冲点 */
.about-illust-pulse {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  z-index: 3;
}

.about-illust-pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.pulse-1 {
  top: 72px;
  left: calc(15% + 48px);
}

.pulse-2 {
  top: 72px;
  right: calc(15% + 48px);
}

.pulse-3 {
  bottom: 28px;
  left: calc(20% + 38px);
}

.pulse-4 {
  bottom: 28px;
  right: calc(20% + 38px);
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.stat-item {
  background: var(--bg-light);
  padding: 24px 16px;
  border-radius: var(--radius);
  text-align: center;
  border-top: 3px solid var(--primary);
  transition: all var(--transition);
}

.stat-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.stat-number {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

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

/* ===== 业务领域 ===== */
.services {
  background: var(--bg-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--bg);
  padding: 36px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  text-align: center;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* 业务领域 SVG 插图 */
.service-illust {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto 18px;
}

.svc-icon-bg {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: var(--primary-light);
  opacity: 0.5;
}

.svc-svg {
  position: relative;
  z-index: 1;
  width: 80px;
  height: 80px;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--text);
}

.service-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* ===== 方案案例 ===== */
.solutions {
  background: var(--bg);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.solution-card {
  background: var(--bg-light);
  padding: 36px 32px;
  border-radius: var(--radius);
  border: 1px solid #e8ecf1;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border-color: var(--primary);
}

/* 方案案例 SVG 插图 */
.solution-illust {
  width: 120px;
  height: 80px;
  margin-bottom: 18px;
  opacity: 0.85;
}

.sol-svg {
  width: 100%;
  height: 100%;
}

.solution-card:hover .sol-svg {
  opacity: 1;
}

.solution-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 16px;
}

.solution-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--text);
}

.solution-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.8;
}

/* ===== 联系我们 ===== */
.contact {
  background: var(--bg-light);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-left {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 10px;
}

.contact-item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 0.95rem;
  color: var(--text-light);
}

/* 联系区信号波插图 */
.contact-illustration {
  position: relative;
  width: 100%;
  height: 140px;
}

.contact-illust-phone {
  position: absolute;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--primary);
  top: 46px;
  left: 20px;
}

.contact-illust-phone::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid #fff;
}

.contact-illust-phone::after {
  content: "";
  position: absolute;
  top: 22px;
  left: 22px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #fff;
}

/* 信号波弧线 */
.contact-illust-wave {
  position: absolute;
  border-radius: 50%;
  border: 2px solid transparent;
  left: 20px;
  top: 22px;
}

.wave-1 {
  width: 100px;
  height: 100px;
  border-top-color: var(--primary);
  border-right-color: rgba(26, 92, 214, 0.3);
  animation: wave-expand 3s ease-out infinite;
}

.wave-2 {
  width: 100px;
  height: 100px;
  border-top-color: var(--accent);
  border-right-color: rgba(0, 201, 167, 0.3);
  animation: wave-expand 3s ease-out 0.6s infinite;
}

.wave-3 {
  width: 100px;
  height: 100px;
  border-top-color: var(--orange);
  border-right-color: rgba(240, 136, 42, 0.3);
  animation: wave-expand 3s ease-out 1.2s infinite;
}

@keyframes wave-expand {
  0% { transform: scale(0.5); opacity: 1; }
  100% { transform: scale(2); opacity: 0; }
}

/* 信号点 */
.contact-illust-signal {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  animation: sig-move 4s ease-in-out infinite;
}

.sig-1 {
  background: var(--primary);
  top: 30px;
  left: 160px;
  animation-delay: 0s;
}

.sig-2 {
  background: var(--accent);
  top: 70px;
  left: 220px;
  animation-delay: 1.3s;
}

.sig-3 {
  background: var(--orange);
  top: 50px;
  left: 300px;
  width: 8px;
  height: 8px;
  animation-delay: 2.6s;
}

@keyframes sig-move {
  0% { opacity: 0; transform: translateX(-20px); }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translateX(30px); }
}

.contact-form {
  background: var(--bg);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #dde3ed;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 92, 214, 0.1);
}

.contact-form textarea {
  resize: vertical;
}

.contact-form .btn {
  align-self: flex-start;
}

/* ===== 页脚 ===== */
.footer {
  background: #0c1e3a;
  color: #a0b3cc;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.footer-logo-img {
  height: 44px;
  width: auto;
}

.footer-eng-logo {
  height: 28px;
  width: auto;
  opacity: 0.6;
  filter: brightness(2);
}

.footer-brand p {
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer-links h4 {
  color: #fff;
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.footer-links a {
  display: block;
  color: #a0b3cc;
  text-decoration: none;
  font-size: 0.93rem;
  padding: 6px 0;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: 0.85rem;
}

.footer-bottom p {
  margin-bottom: 4px;
}

/* ===== 响应式适配 ===== */

/* 平板 */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    padding-top: 0;
  }

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

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

  .hero-eng-logo {
    margin: 10px auto 0;
  }

  .hero-visual {
    display: none;
  }

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

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

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

  .highlight-item:nth-child(2)::after {
    display: none;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* 手机 */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .nav-label {
    display: flex;
  }

  .nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
    overflow: visible;
    z-index: 1001;
  }

  .nav > a {
    padding: 14px 16px;
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .nav-toggle:checked ~ .nav {
    transform: translateY(0);
    opacity: 1;
  }

  /* 移动端下拉菜单适配 */
  .nav-dropdown-menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    min-width: auto;
    padding: 0 0 0 16px;
    display: none;
    overflow: visible;
  }

  .nav-dropdown-menu a {
    padding: 14px 20px;
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .nav-dropdown-menu::before {
    display: none;
  }

  .nav-dropdown.open .nav-dropdown-menu {
    display: block;
  }

  .nav-dropdown-toggle {
    justify-content: space-between;
    padding: 14px 16px;
    min-height: 48px;
  }

  .hero {
    padding: 110px 0 70px;
  }

  .hero h1 {
    font-size: 2rem;
    letter-spacing: 2px;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .section {
    padding: 70px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .about-illustration {
    height: 160px;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr 1fr;
  }

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

  .highlights-inner {
    grid-template-columns: 1fr 1fr;
  }

  .highlight-item:not(:last-child)::after {
    display: none;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: auto;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
  }

  .stat-item {
    padding: 20px;
  }

  .highlights-inner {
    grid-template-columns: 1fr;
  }

  .contact-form {
    padding: 24px;
  }
}