/* ========== 全局变量 ========== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --primary-bg: #eff6ff;
  --accent: #0ea5e9;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --gray: #64748b;
  --gray-light: #f1f5f9;
  --white: #ffffff;
  --shadow: 0 4px 24px rgba(37, 99, 235, 0.08);
  --shadow-hover: 0 8px 40px rgba(37, 99, 235, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

.section {
  padding: 100px 0;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(37,99,235,0.08);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

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

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

.logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.logo-text { display: flex; flex-direction: column; }
.logo-main { font-weight: 700; font-size: 18px; color: var(--dark); line-height: 1.2; }
.logo-sub { font-size: 12px; color: var(--gray); }

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

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--gray);
  transition: var(--transition);
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: var(--primary-bg);
}

.nav-cta {
  background: var(--primary);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

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

.hamburger span {
  width: 24px; height: 2px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #2563eb 100%);
  overflow: hidden;
  padding-top: 72px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.particles {
  position: absolute;
  inset: 0;
}

.particle {
  position: absolute;
  width: 4px; height: 4px;
  background: rgba(255,255,255,0.3);
  border-radius: 50%;
  animation: float linear infinite;
}

@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100px) scale(1); opacity: 0; }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 80px 0;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  color: white;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 64px;
  margin-bottom: 48px;
}

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

.stat-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37,99,235,0.4);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: white;
  background: rgba(255,255,255,0.1);
}

.btn-full { width: 100%; }

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.5);
  font-size: 12px;
}

.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid rgba(255,255,255,0.5);
  border-bottom: 2px solid rgba(255,255,255,0.5);
  transform: rotate(45deg);
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translate(0,0); }
  50% { transform: rotate(45deg) translate(5px,5px); }
}

/* ========== 通用 Section ========== */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  background: var(--primary-bg);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--gray);
  max-width: 560px;
  margin: 0 auto;
}

/* ========== 核心功能 ========== */
.features {
  background: var(--white);
}

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

.feature-card {
  background: var(--white);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

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

.feature-icon {
  width: 56px; height: 56px;
  background: var(--primary-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg { width: 32px; height: 32px; }

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--dark);
}

.feature-card p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
}

/* ========== 产品优势 ========== */
.advantages {
  background: var(--gray-light);
}

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

.advantage-item {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
}

.advantage-item:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.advantage-num {
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.3;
}

.advantage-item h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--dark);
}

.advantage-item p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
}

/* ========== 应用场景 ========== */
.scenarios {
  background: var(--white);
}

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

.scenario-card {
  background: linear-gradient(135deg, var(--primary-bg), #f0f9ff);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.scenario-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.scenario-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.scenario-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--dark);
}

.scenario-card p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
}

/* ========== 客户案例 ========== */
.cases {
  background: var(--gray-light);
}

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

.case-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.case-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.case-company { font-weight: 700; font-size: 16px; color: var(--dark); }
.case-tag { background: var(--primary-bg); color: var(--primary); padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; }

.case-content {
  flex: 1;
  margin-bottom: 16px;
}

.case-content p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
  font-style: italic;
}

.case-result {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.case-result span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

/* ========== 资料下载 ========== */
.download {
  background: var(--white);
}

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

.download-card {
  background: var(--gray-light);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: var(--transition);
  border: 1px solid transparent;
}

.download-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.download-icon {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.download-info { flex: 1; }
.download-info h4 { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.download-info p { font-size: 12px; color: var(--gray); }

.download-btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.download-btn:hover { background: var(--primary-dark); }

/* ========== 联系我们 ========== */
.contact {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
}

.contact .section-header .section-tag { background: rgba(255,255,255,0.1); color: var(--primary-light); }
.contact .section-title { color: white; }
.contact .section-desc { color: rgba(255,255,255,0.7); }

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-form-box {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 36px;
}

.contact-form-box h3 {
  color: white;
  font-size: 20px;
  margin-bottom: 24px;
}

.form-group { margin-bottom: 16px; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  color: white;
  font-size: 15px;
  outline: none;
  transition: var(--transition);
  font-family: inherit;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,0.4);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary-light);
  background: rgba(255,255,255,0.12);
}

.form-success {
  text-align: center;
  padding: 40px 20px;
}

.success-icon {
  width: 64px; height: 64px;
  background: #10b981;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin: 0 auto 16px;
}

.form-success p { color: rgba(255,255,255,0.8); font-size: 16px; }

.contact-info-box {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 36px;
}

.contact-info-box h3 {
  color: white;
  font-size: 20px;
  margin-bottom: 24px;
}

.contact-info-list { display: flex; flex-direction: column; gap: 20px; }

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

.info-icon { font-size: 24px; flex-shrink: 0; margin-top: 2px; }

.info-label { font-size: 12px; color: rgba(255,255,255,0.5); margin-bottom: 2px; }
.info-value { font-size: 15px; color: white; font-weight: 500; }

/* ========== 页脚 ========== */
.footer {
  background: #0a0f1e;
  padding: 64px 0 0;
  color: rgba(255,255,255,0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo-main { color: white; }
.footer-brand .logo-sub { color: rgba(255,255,255,0.5); }
.footer-desc { font-size: 14px; line-height: 1.8; }

.footer-links h4,
.footer-contact h4 {
  color: white;
  font-size: 16px;
  margin-bottom: 20px;
}

.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 14px; transition: var(--transition); }
.footer-links a:hover { color: var(--primary-light); }

.footer-contact p { font-size: 14px; margin-bottom: 8px; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* ========== 管理后台悬浮入口 ========== */
.admin-float {
  position: fixed;
  bottom: 12px;
  right: 12px;
  background: rgba(15, 23, 42, 0.3);
  color: rgba(255,255,255,0.5);
  padding: 6px 12px;
  border-radius: 16px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  z-index: 999;
  opacity: 0.4;
}

.admin-float:hover {
  background: rgba(15, 23, 42, 0.6);
  color: white;
  opacity: 1;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .features-grid,
  .advantages-grid,
  .scenarios-grid,
  .cases-grid,
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-cta { display: none; }
  .hamburger { display: flex; }

  .hero-title { font-size: 32px; }
  .hero-stats { flex-direction: column; gap: 24px; }
  .hero-buttons { flex-direction: column; align-items: center; }

  .section { padding: 64px 0; }
  .section-title { font-size: 28px; }

  .features-grid,
  .advantages-grid,
  .scenarios-grid,
  .cases-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}