/* ============================================
   国产一区品牌官网 - 全局样式表
   设计理念：现代科技感 + 二次元美学
   主色调：紫蓝渐变 (#7C3AED → #06B6D4)
   ============================================ */

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

:root {
  --primary-purple: #7C3AED;
  --primary-cyan: #06B6D4;
  --secondary-pink: #EC4899;
  --accent-orange: #F59E0B;
  --dark-bg: #0F172A;
  --light-bg: #FFFFFF;
  --text-dark: #1E293B;
  --text-light: #F1F5F9;
  --border-color: #E2E8F0;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.2);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Microsoft YaHei', '微软雅黑', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--light-bg);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 响应式容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ============================================
   头部导航栏
   ============================================ */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.9) 100%);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  padding: 0 30px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 700;
  font-size: 24px;
  background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 30px;
  margin: 0;
}

nav a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  font-size: 15px;
  position: relative;
  transition: var(--transition);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-purple), var(--primary-cyan));
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.search-box {
  position: relative;
  width: 200px;
}

.search-box input {
  width: 100%;
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background-color: #F8FAFC;
  font-size: 14px;
  transition: var(--transition);
  cursor: pointer;
}

.search-box input:hover {
  border-color: var(--primary-purple);
  background-color: #F1F5F9;
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.btn-contact {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-cyan) 100%);
  color: white;
  border: none;
  border-radius: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.btn-contact:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-dark);
}

@media (max-width: 768px) {
  .header-content {
    padding: 0 16px;
    height: 60px;
  }

  nav {
    display: none;
  }

  nav.active {
    display: block;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow-md);
  }

  nav ul {
    flex-direction: column;
    gap: 15px;
  }

  .search-box {
    width: 150px;
  }

  .menu-toggle {
    display: block;
  }

  .header-actions {
    gap: 10px;
  }

  .search-box {
    display: none;
  }
}

/* ============================================
   Hero Banner 英雄区
   ============================================ */
.hero {
  position: relative;
  height: 600px;
  background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-cyan) 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="1200" height="600" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.hero p {
  font-size: 20px;
  margin-bottom: 40px;
  opacity: 0.95;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
  padding: 14px 40px;
  border: none;
  border-radius: 25px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background-color: white;
  color: var(--primary-purple);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: white;
  border: 2px solid white;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  .hero {
    height: 400px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: 16px;
  }

  .hero-buttons {
    gap: 12px;
  }

  .btn-primary, .btn-secondary {
    padding: 12px 30px;
    font-size: 14px;
  }
}

/* ============================================
   内容区块通用样式
   ============================================ */
section {
  padding: 80px 0;
}

section h2 {
  font-size: 42px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 50px;
  background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (max-width: 768px) {
  section {
    padding: 50px 0;
  }

  section h2 {
    font-size: 28px;
    margin-bottom: 30px;
  }
}

/* ============================================
   功能卡片网格
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.feature-card {
  background: white;
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-purple), var(--primary-cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

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

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 15px;
  color: var(--text-dark);
}

.feature-card p {
  color: #64748B;
  font-size: 14px;
  line-height: 1.8;
}

.feature-card .icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 15px;
}

/* ============================================
   视频卡片
   ============================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.video-card {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  background-color: #000;
  cursor: pointer;
  group: 'video';
  aspect-ratio: 16 / 9;
}

.video-card video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-card:hover .video-overlay {
  opacity: 1;
}

.play-button {
  width: 60px;
  height: 60px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary-purple);
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  transform: scale(0.8);
}

.video-card:hover .play-button {
  transform: scale(1);
}

.video-title {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 15px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: white;
  font-size: 14px;
  font-weight: 500;
}

/* ============================================
   专家卡片
   ============================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 25px;
}

.expert-card {
  text-align: center;
  background: white;
  border-radius: 12px;
  padding: 25px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 15px;
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: white;
  border: 3px solid var(--border-color);
}

.expert-card h3 {
  font-size: 18px;
  margin-bottom: 5px;
}

.expert-card .title {
  color: var(--primary-purple);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}

.expert-card p {
  font-size: 13px;
  color: #64748B;
  margin-bottom: 15px;
}

.expert-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.expert-actions button {
  padding: 8px 16px;
  border: 1px solid var(--primary-purple);
  background: transparent;
  color: var(--primary-purple);
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.expert-actions button:hover {
  background: var(--primary-purple);
  color: white;
}

/* ============================================
   FAQ 折叠区
   ============================================ */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: 12px;
  margin-bottom: 15px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.faq-question {
  padding: 20px;
  background: #F8FAFC;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--text-dark);
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover {
  background: #F1F5F9;
}

.faq-question.active {
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
  color: white;
}

.faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: transform 0.3s ease;
}

.faq-question.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: #64748B;
  line-height: 1.8;
}

.faq-answer.active {
  padding: 20px;
  max-height: 500px;
}

/* ============================================
   用户评价区
   ============================================ */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
}

.testimonial-card {
  background: white;
  border-radius: 12px;
  padding: 25px;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--primary-purple);
  transition: var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-md);
}

.testimonial-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 15px;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.testimonial-info h4 {
  font-size: 14px;
  margin-bottom: 2px;
}

.testimonial-info .date {
  font-size: 12px;
  color: #94A3B8;
}

.testimonial-rating {
  color: var(--accent-orange);
  font-size: 14px;
}

.testimonial-text {
  color: #64748B;
  font-size: 14px;
  line-height: 1.8;
  font-style: italic;
}

/* ============================================
   底部Footer
   ============================================ */
footer {
  background: linear-gradient(135deg, var(--dark-bg) 0%, #1E293B 100%);
  color: var(--text-light);
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h3 {
  font-size: 16px;
  margin-bottom: 20px;
  color: white;
}

.footer-section ul {
  list-style: none;
}

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

.footer-section a {
  color: #CBD5E1;
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--primary-cyan);
}

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

.footer-qr img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  margin-bottom: 10px;
}

.footer-qr p {
  font-size: 12px;
  color: #CBD5E1;
}

.footer-divider {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  margin-top: 30px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copyright {
  font-size: 14px;
  color: #CBD5E1;
}

.footer-social {
  display: flex;
  gap: 15px;
}

.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  transition: var(--transition);
  font-size: 18px;
}

.social-icon:hover {
  background: var(--primary-cyan);
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  footer {
    padding: 40px 0 20px;
  }

  .footer-content {
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-social {
    justify-content: center;
  }
}

/* ============================================
   动画效果
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .container {
    max-width: 900px;
  }
}

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

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }

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

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }

  .hero p {
    font-size: 14px;
  }

  section h2 {
    font-size: 24px;
  }

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

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

/* ============================================
   打印样式
   ============================================ */
@media print {
  header, footer, .btn-contact, .hero-buttons {
    display: none;
  }

  body {
    background: white;
  }

  section {
    page-break-inside: avoid;
  }
}