/* ============================================
   上海星展瀚电子 企业官网 - 自定义样式
   ============================================ */

/* ---------- 全局基础样式 ---------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  overflow-x: hidden;
}

/* ---------- 导航栏样式 ---------- */
.navbar {
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.97) !important;
  box-shadow: 0 2px 20px rgba(76, 29, 149, 0.1);
}

.navbar.scrolled .nav-link {
  color: #4c1d95 !important;
}

.navbar.scrolled .nav-link:hover {
  color: #7c3aed !important;
}

.navbar.scrolled .nav-logo-text {
  color: #4c1d95 !important;
}

/* 导航链接悬停下划线效果 */
.nav-link {
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: #7c3aed;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* ---------- Hero 区域背景 ---------- */
.hero-bg {
  background-image: url('../images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  overflow: hidden;
}

/* 紫色半透明遮罩层 —— 让背景图和品牌紫色融合 */
.hero-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(76, 29, 149, 0.55) 0%, rgba(124, 58, 237, 0.45) 50%, rgba(109, 40, 217, 0.5) 100%);
  pointer-events: none;
}

/* Hero 区域浮动光点动画 */
.hero-bg::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  top: -150px;
  right: -150px;
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-40px, 40px); }
}

/* ---------- 滚动动画 ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- 品牌卡片样式 ---------- */
.brand-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid #e5e7eb;
}

.brand-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(76, 29, 149, 0.15);
  border-color: #7c3aed;
}

/* 品牌卡片顶部色条 */
.brand-card .card-accent {
  height: 4px;
  background: linear-gradient(90deg, #4c1d95, #7c3aed);
  border-radius: 4px 4px 0 0;
}

/* ---------- 应用领域卡片 ---------- */
.app-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.app-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(76, 29, 149, 0.1);
}

.app-card .icon-wrapper {
  transition: background-color 0.3s ease;
}

.app-card:hover .icon-wrapper {
  background-color: #7c3aed;
}

.app-card:hover .icon-wrapper svg {
  color: white;
}

/* ---------- 优势卡片 ---------- */
.advantage-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(76, 29, 149, 0.1);
}

/* ---------- 联系信息卡片 ---------- */
.contact-card {
  transition: transform 0.3s ease;
}

.contact-card:hover {
  transform: translateY(-4px);
}

/* ---------- 移动端菜单动画 ---------- */
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.mobile-menu.open {
  max-height: 300px;
}

/* ---------- 汉堡菜单按钮动画 ---------- */
.hamburger-line {
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* ---------- 区域分隔装饰线 ---------- */
.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, #4c1d95, #7c3aed);
  margin: 0 auto;
  border-radius: 2px;
}

/* ---------- 按钮悬停效果 ---------- */
.btn-primary {
  background: linear-gradient(135deg, #7c3aed, #6d28d9);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4);
}

/* ---------- 响应式微调 ---------- */
@media (max-width: 768px) {
  .hero-bg {
    min-height: 70vh;
  }
}

@media (min-width: 769px) {
  .hero-bg {
    min-height: 85vh;
  }
}