/* ============================================
   七层协议科技 - 全新科技风样式
   深色主题 | 粒子动画 | 玻璃拟态 | 霓虹渐变
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --bg-primary: #060818;
  --bg-secondary: #0a0e2a;
  --bg-card: rgba(16, 22, 58, 0.6);
  --bg-card-hover: rgba(22, 30, 72, 0.8);
  --accent-cyan: #00e5ff;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #64748b;
  --border-glow: rgba(0, 229, 255, 0.3);
  --gradient-main: linear-gradient(135deg, #00e5ff 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-text: linear-gradient(135deg, #00e5ff 0%, #8b5cf6 100%);
  --gradient-card: linear-gradient(135deg, rgba(0, 229, 255, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
  --shadow-glow: 0 0 30px rgba(0, 229, 255, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --radius: 16px;
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 全局背景网格 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

/* ---------- 通用容器 ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 50px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 2px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-title .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 60px;
  text-align: center;
}

.text-center {
  text-align: center;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(6, 8, 24, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 229, 255, 0.1);
  padding: 12px 0;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-logo .logo-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient-main);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  box-shadow: var(--shadow-glow);
  overflow: hidden;
  padding: 4px;
}

.nav-logo .logo-icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.nav-logo .logo-text span {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-menu a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent-cyan);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: width 0.3s ease;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 28px;
  background: var(--gradient-main);
  color: #fff !important;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.3);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 229, 255, 0.5);
}

.nav-cta::after {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 26px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* ---------- Hero 区域 ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  z-index: 0;
  pointer-events: none;
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: rgba(0, 229, 255, 0.15);
  top: -100px;
  right: -100px;
  animation: floatGlow 8s ease-in-out infinite;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: rgba(139, 92, 246, 0.12);
  bottom: -100px;
  left: -50px;
  animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 50px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero h1 .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--accent-cyan);
  margin-left: 4px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

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

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 36px;
  background: var(--gradient-main);
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 4px 25px rgba(0, 229, 255, 0.35);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 35px rgba(0, 229, 255, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 36px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero 底部数据条 */
.hero-stats {
  display: flex;
  gap: 50px;
  margin-top: 70px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-stat-item .num {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-item .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- 核心业务区 ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 40px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.service-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
  background: var(--gradient-card);
  border: 1px solid rgba(0, 229, 255, 0.15);
}

.service-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

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

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.service-tag {
  padding: 4px 14px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 50px;
  font-size: 0.78rem;
  color: var(--accent-cyan);
}

/* ---------- 技术架构区 ---------- */
.tech-section {
  background: linear-gradient(180deg, transparent 0%, rgba(10, 14, 42, 0.5) 50%, transparent 100%);
}

.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.tech-visual {
  position: relative;
  height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tech-orb {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(0, 229, 255, 0.2), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(0, 229, 255, 0.2);
  position: relative;
  animation: rotateOrb 20s linear infinite;
}

.tech-orb::before,
.tech-orb::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(0, 229, 255, 0.1);
}

.tech-orb::before {
  inset: -40px;
  border-color: rgba(59, 130, 246, 0.15);
  border-style: dashed;
  animation: rotateOrb 30s linear infinite reverse;
}

.tech-orb::after {
  inset: -80px;
  border-color: rgba(139, 92, 246, 0.1);
  border-style: dotted;
  animation: rotateOrb 40s linear infinite;
}

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

.tech-orb-inner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 2;
}

.tech-orb-inner .orb-icon {
  font-size: 3rem;
  margin-bottom: 10px;
}

.tech-orb-inner .orb-label {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  letter-spacing: 3px;
  text-transform: uppercase;
}

.tech-orb-node {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 15px var(--accent-cyan);
}

.tech-features {
  list-style: none;
}

.tech-features li {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.tech-feature-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 12px;
  background: var(--gradient-card);
  border: 1px solid rgba(0, 229, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.tech-features h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.tech-features p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---------- 数据统计区 ---------- */
.stats-section {
  padding: 80px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.stat-card {
  text-align: center;
  padding: 40px 20px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

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

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---------- 关于我们区 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h2 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}

.about-text h2 .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}

.about-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.about-list li::before {
  content: '';
  width: 20px;
  height: 20px;
  min-width: 20px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.about-list li::after {
  content: '✓';
  position: absolute;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

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

.about-card {
  padding: 30px 24px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.about-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-5px);
}

.about-card .card-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}

.about-card h4 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.about-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.about-card:nth-child(2) {
  transform: translateY(30px);
}

.about-card:nth-child(3) {
  transform: translateY(-10px);
}

/* ---------- CTA 区域 ---------- */
.cta-section {
  padding: 80px 0;
}

.cta-box {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 24px;
  padding: 70px 50px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.05) 0%, transparent 60%);
  animation: ctaPulse 6s ease-in-out infinite;
}

@keyframes ctaPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 1; }
}

.cta-box h2 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-box h2 .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-box p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 36px;
  position: relative;
  z-index: 1;
}

.cta-box .hero-buttons {
  justify-content: center;
  position: relative;
  z-index: 1;
}

/* ---------- 页脚 ---------- */
.footer {
  background: rgba(6, 8, 24, 0.8);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 70px 0 30px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand .nav-logo {
  margin-bottom: 20px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-col h6 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--accent-cyan);
}

.footer-contact p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-contact p .icon {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 30px;
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-bottom .icp {
  cursor: pointer;
  transition: var(--transition);
}

.footer-bottom .icp:hover {
  color: var(--accent-cyan);
}

/* ---------- 联系页面 ---------- */
.page-header {
  padding: 160px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-header h1 .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-header .breadcrumb {
  display: flex;
  justify-content: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.page-header .breadcrumb a {
  color: var(--accent-cyan);
  transition: var(--transition);
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  margin-bottom: 60px;
}

.contact-form-wrapper {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 44px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.contact-form-wrapper h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.contact-form-wrapper > p {
  color: var(--text-muted);
  margin-bottom: 30px;
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 22px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 18px;
  background: rgba(6, 8, 24, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

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

.contact-info-wrapper {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 36px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition);
}

.contact-info-card:hover {
  border-color: var(--border-glow);
}

.contact-info-card h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.contact-info-card h3 .icon {
  color: var(--accent-cyan);
}

.contact-info-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.contact-info-card p .icon {
  color: var(--accent-cyan);
  font-size: 1rem;
}

.map-wrapper {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 20px;
}

.map-wrapper iframe {
  width: 100%;
  height: 400px;
  border: 0;
  filter: invert(0.92) hue-rotate(180deg) brightness(0.9) contrast(0.85);
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* ---------- 返回顶部 ---------- */
#backtotop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--gradient-main);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.3);
}

#backtotop.show {
  opacity: 1;
  visibility: visible;
}

#backtotop::before {
  content: '↑';
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
}

#backtotop:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.5);
}

/* ---------- 加载动画 ---------- */
.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-spinner {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(0, 229, 255, 0.1);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tech-grid,
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .tech-visual {
    height: 320px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(6, 8, 24, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 30px;
    transition: right 0.4s ease;
    border-left: 1px solid rgba(0, 229, 255, 0.1);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

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

  .hero-stats {
    flex-wrap: wrap;
    gap: 30px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

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

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

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

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

  .about-card:nth-child(2),
  .about-card:nth-child(3) {
    transform: none;
  }

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

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

  .cta-box {
    padding: 50px 25px;
  }

  .cta-box h2 {
    font-size: 1.8rem;
  }

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

  .page-header h1 {
    font-size: 2.2rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.9rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    text-align: center;
    justify-content: center;
  }

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

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

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
}