/* ============================================
   HDKSH 电子元器件 - 全局样式
   设计理念：科技感、工业风、高辨识度
   ============================================ */

/* 变量定义 */
:root {
  --bg-dark: #0a0e14;
  --bg-card: #131920;
  --bg-card-hover: #1a212c;
  --accent-cyan: #00d4aa;
  --accent-blue: #3b82f6;
  --accent-glow: rgba(0, 212, 170, 0.3);
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --border-subtle: rgba(139, 148, 158, 0.15);
  --font-display: 'Orbitron', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', -apple-system, sans-serif;
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 背景装饰 - 电路板风格网格 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 212, 170, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 170, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* 导航栏 */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition);
}

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

/* 主内容区 */
main {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

/* 英雄区 */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  position: relative;
}

/* 英雄区背景图 - 芯片/科技主题 */
.hero-with-bg {
  position: relative;
  overflow: hidden;
}

.hero-with-bg .hero-bg-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.hero-with-bg .hero-bg-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(10, 14, 20, 0.4) 0%, rgba(10, 14, 20, 0.65) 100%);
  z-index: -1;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.5;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: rgba(0, 212, 170, 0.15);
  border: 1px solid rgba(0, 212, 170, 0.4);
  border-radius: 2rem;
  font-size: 0.8rem;
  color: var(--accent-cyan);
  letter-spacing: 0.2em;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 2rem;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.btn {
  display: inline-block;
  padding: 0.9rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-dark);
  border: none;
}

.btn-primary:hover {
  background: #00f5c4;
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--accent-cyan);
  border: 2px solid var(--accent-cyan);
}

.btn-outline:hover {
  background: rgba(0, 212, 170, 0.1);
  transform: translateY(-2px);
}

/* 通用区块 */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.section-subtitle {
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

/* 品牌卡片网格 */
.brands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.brand-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.brand-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--accent-cyan);
  transition: height var(--transition);
}

.brand-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 212, 170, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.brand-card:hover::before {
  height: 100%;
}

.brand-card.hidden {
  display: none;
}

.brand-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.brand-logo {
  width: 48px;
  height: 48px;
  background: rgba(0, 212, 170, 0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent-cyan);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
}

.brand-region {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.brand-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.brand-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.brand-tag {
  padding: 0.25rem 0.75rem;
  background: rgba(0, 212, 170, 0.1);
  border-radius: 1rem;
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

/* 品牌筛选 */
.brand-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  justify-content: center;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: rgba(0, 212, 170, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* 首页简介区块 */
.intro-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

@media (max-width: 768px) {
  .intro-section {
    grid-template-columns: 1fr;
  }
}

.intro-text h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.intro-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.intro-visual {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.intro-stat {
  text-align: center;
  padding: 1rem;
}

.intro-stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
}

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

/* 优势区块 */
.advantages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
}

.advantage-card:hover {
  border-color: rgba(0, 212, 170, 0.3);
  transform: translateY(-4px);
}

.advantage-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1rem;
  background: rgba(0, 212, 170, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.advantage-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.advantage-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* 页脚 */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 2rem 2rem;
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

.footer-links {
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  display: block;
  margin-bottom: 0.5rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* 联系页表单 */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-item-icon {
  width: 40px;
  height: 40px;
  background: rgba(0, 212, 170, 0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.contact-item strong {
  display: block;
  margin-top: 0.25rem;
  color: var(--text-primary);
}

/* 关于我们 - 时间线 */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--border-subtle);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--bg-dark);
}

.timeline-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

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

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 产品详情页 */
.product-detail .product-section {
  margin-bottom: 2.5rem;
}

.product-detail .product-section h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--accent-cyan);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.product-detail .product-section ul {
  list-style: none;
  padding-left: 0;
}

.product-detail .product-section li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.product-detail .product-section li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.product-detail .product-section p {
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.product-detail .product-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.product-detail .product-table th,
.product-detail .product-table td {
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.product-detail .product-table th {
  color: var(--accent-cyan);
  font-weight: 600;
}

.product-detail .product-table td {
  color: var(--text-secondary);
}

.product-detail .product-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-cyan);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.product-detail .product-link:hover {
  text-decoration: underline;
}

.product-detail .sub-list {
  margin-left: 1rem;
  margin-top: 0.5rem;
}

.product-detail .sub-list li {
  padding-left: 1rem;
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }
  
  .hero {
    padding: 5rem 1.5rem 3rem;
  }
  
  .section {
    padding: 3rem 1.5rem;
  }
  
  .brands-grid {
    grid-template-columns: 1fr;
  }
}