/* ================================================================
   文件：style.css
   说明：雅合科技官网 - 全站样式表
   维护：按模块分组，修改变量或对应选择器即可
   ================================================================ */

/* ================================================================
   一、全局变量与基础重置
   ================================================================ */
:root {
  --primary: #1a73e8;
  --primary-dark: #0d47a1;
  --primary-light: #e8f0fe;
  --secondary: #00adec;
  --accent: #2a5f8f;
  --gray-bg: #f8f9fa;
  --gray-light: #f0f0f0;
  --text-dark: #202124;
  --text-light: #5f6368;
  --text-muted: #80868b;
  --white: #ffffff;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.12);
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.06);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --radius-full: 40px;
  --transition: 0.3s ease;
  --transition-fast: 0.15s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  max-width: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  background: var(--white);
  overflow-x: hidden;
  font-size: 16px;
}

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

/* ================================================================
   二、容器（所有宽度统一管理）
   ================================================================ */
.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
}

/* ================================================================
   三、导航栏
   ================================================================ */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  padding: 0 15px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo img {
  height: 32px;
  width: auto;
  max-width: 100%;
}

nav {
  display: flex;
  align-items: center;
  gap: 0 20px;
}

nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-dark);
  transition: var(--transition);
  position: relative;
  white-space: nowrap;
  padding: 8px 0;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

nav a:hover {
  color: var(--primary);
}

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

/* ================================================================
   四、横幅（Banner）
   ================================================================ */
#banner {
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 20px 60px;
  background: linear-gradient(135deg, #1a3a5c, #2a5f8f);
}

#banner video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

#banner video::poster {
  background: linear-gradient(135deg, #1a3a5c, #2a5f8f);
}

#banner .overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 30%;
  background: linear-gradient(to top, rgba(255, 255, 255, 0.98), transparent);
  z-index: 1;
}

#banner .container {
  position: relative;
  z-index: 2;
  padding: 0 20px;
  text-align: center;
}

#banner h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  text-shadow: 
    0 0 20px rgba(0, 0, 0, 0.8),
    0 0 40px rgba(0, 0, 0, 0.6),
    0 2px 4px rgba(0, 0, 0, 0.5),
    0 0 60px rgba(0, 0, 0, 0.4);
  line-height: 1.2;
  letter-spacing: 1px;
}

#banner p {
  font-size: 1.3rem;
  color: #ffffff;
  max-width: 600px;
  margin: 0 auto 32px;
  text-shadow: 
    0 0 15px rgba(0, 0, 0, 0.8),
    0 0 30px rgba(0, 0, 0, 0.6),
    0 1px 2px rgba(0, 0, 0, 0.5);
  font-weight: 500;
}

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 14px 40px;
  border-radius: var(--radius-full);
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(26, 115, 232, 0.4);
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(26, 115, 232, 0.5);
}

/* ================================================================
   五、通用区块
   ================================================================ */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.section-subtitle {
  text-align: center;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 48px;
  font-size: 1.1rem;
}

/* ================================================================
   六、公司介绍（About）
   ================================================================ */
#about {
  position: relative;
  padding: 100px 0;
  min-height: 600px;
  background-image: url('../images/DSC_2260.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}

#about .about-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.85);
  z-index: 0;
}

#about .content {
  position: relative;
  z-index: 2;
}

#about .text {
  max-width: 800px;
  margin: 0 auto;
}

#about .text h2 {
  font-size: 2rem;
  margin-bottom: 16px;
  color: var(--primary-dark);
}

#about .text p {
  color: #000000;
  margin-bottom: 12px;
  word-wrap: break-word;
  line-height: 1.7;
}

#about .text strong {
  color: #1a73e8;
}

/* ================================================================
   七、滚动渐显效果
   ================================================================ */
.scroll-fade {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ================================================================
   八、企业文化（Culture）
   ================================================================ */
#culture {
  background: var(--gray-bg);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.value-card {
  padding: 28px 20px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  color: var(--white);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.value-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius);
  z-index: 0;
}

.value-card > * {
  position: relative;
  z-index: 1;
}

.value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.value-card h4 {
  font-size: 2.3rem;
  margin-bottom: 6px;
  color: var(--white);
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.8);
}

.value-card p {
  font-size: 1.4rem;
  color: var(--white);
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.8);
  font-weight: 600;
  margin: 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 900px;
  margin: 0 auto;
}

.stat-item {
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  color: var(--white);
}

.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius);
  z-index: 0;
}

.stat-item > * {
  position: relative;
  z-index: 1;
}

.stat-item .number {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
}

.stat-item .label {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  margin-top: 4px;
}

/* ================================================================
   八、产品中心
   ================================================================ */
#products {
  background: var(--white);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
  margin-top: 20px;
}

.category-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

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

.category-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.category-card h3 {
  padding: 20px 10px 10px;
  font-size: 1.4rem;
  color: var(--text-dark);
}

.category-card p {
  padding: 0 10px 20px;
  color: var(--text-light);
  font-size: 0.95rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  margin-top: 20px;
}

.product-card {
  background: var(--gray-bg);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

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

.product-card img {
  max-width: 100%;
  border-radius: var(--radius-sm);
}

.product-card i {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 16px;
  display: block;
}

.product-card h4 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.product-card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

.back-btn {
  display: inline-block;
  margin-bottom: 20px;
  background: transparent;
  border: none;
  color: var(--primary);
  font-size: 1rem;
  cursor: pointer;
  padding: 8px 0;
  transition: var(--transition);
}

.back-btn:hover {
  color: var(--primary-dark);
  transform: translateX(-4px);
}

.view {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#detailContent {
  max-width: 800px;
  margin: 0 auto;
}

#detailContent img {
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  border-radius: var(--radius);
  margin-bottom: 20px;
}

#detailContent h2 {
  font-size: 2rem;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

#detailContent .detail-desc {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-dark);
  margin-bottom: 20px;
}

#detailContent .detail-video video {
  width: 100%;
  border-radius: var(--radius);
}

/* ================================================================
   九、视频中心
   ================================================================ */
#video {
  background: var(--gray-bg);
}

.video-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
  margin-top: 20px;
}

.video-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.video-card .video-thumb {
  width: 100%;
  height: 180px;
  background: #1a1a1a;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

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

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

.video-card .play-icon {
  position: absolute;
  width: 50px;
  height: 50px;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.video-card .play-icon i {
  color: #fff;
  font-size: 1.5rem;
  margin-left: 3px;
}

.video-card:hover .play-icon {
  background: rgba(0, 0, 0, 0.8);
  transform: scale(1.1);
}

.video-card h4 {
  padding: 14px 10px 8px;
  font-size: 1.1rem;
  color: var(--text-dark);
}

.video-card p {
  padding: 0 10px 16px;
  font-size: 0.9rem;
  color: var(--text-light);
}

.video-player-wrapper {
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-player-wrapper video {
  width: 100%;
  height: 100%;
  display: block;
}

.video-player-title {
  text-align: center;
  font-size: 1.5rem;
  margin: 16px 0 8px;
  color: var(--primary-dark);
}

.video-player-desc {
  text-align: center;
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

/* ================================================================
   十、合作客户
   ================================================================ */
#clients {
  background: var(--white);
}

.client-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px 30px;
  margin-top: 16px;
}

.client-logos img {
  height: 50px;
  max-width: 150px;
  object-fit: contain;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.client-logos img:hover {
  opacity: 1;
  transform: scale(1.05);
}

.client-logos img.logo-large {
  height: 70px;
  max-width: 200px;
}

/* ================================================================
   十一、联系我们
   ================================================================ */
#contact {
  background: var(--white);
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px 40px;
  margin-top: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.05rem;
}

.contact-item i {
  font-size: 1.6rem;
  color: var(--primary);
  width: 40px;
  text-align: center;
}

/* ================================================================
   十二、页脚
   ================================================================ */
footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 40px 0 24px;
}

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

footer .footer-links a {
  color: rgba(255, 255, 255, 0.7);
  margin-left: 24px;
  transition: var(--transition);
}

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

/* ================================================================
   十三、滚动淡出（横幅文字）
   ================================================================ */
@keyframes fadeOutOnScroll {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-60px);
  }
}

.fade-out {
  animation: fadeOutOnScroll linear;
  animation-timeline: scroll(y);
  animation-range: 0% 60%;
  transform-origin: center bottom;
}

@supports not (animation-timeline: scroll()) {
  .fade-out {
    animation: none;
    opacity: 1 !important;
  }
}

/* ================================================================
   十四、公司资质板块
   ================================================================ */
#qualifications {
  background: var(--gray-bg);
  padding: 80px 0;
}

.qualification-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 20px;
}

.qualification-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
  padding-bottom: 24px;
}

.qualification-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.qualification-card .qualification-image {
  width: 100%;
  height: 220px;
  background: var(--gray-bg);
  overflow: hidden;
}

.qualification-card .qualification-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qualification-card .qualification-icon {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
}

.qualification-card .qualification-icon i {
  font-size: 5rem;
  color: var(--white);
}

.qualification-card h3 {
  font-size: 1.3rem;
  margin: 20px 16px 8px;
  color: var(--text-dark);
}

.qualification-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin: 0 16px 16px;
}

.qualification-card .btn-sm {
  padding: 10px 28px;
  font-size: 0.9rem;
}

/* ================================================================
   十五、公司技术专利板块（保留用于专利子页面）
   ================================================================ */
#patents {
  background: var(--gray-bg);
  padding: 80px 0;
}

.patent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
  margin-top: 20px;
}

.patent-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
  padding-bottom: 20px;
}

.patent-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.patent-card img {
  width: 100%;
  height: 300px;
  object-fit: contain;
  background: var(--gray-bg);
  padding: 15px;
  display: block;
  border-bottom: 1px solid #eee;
}

.patent-card h3 {
  font-size: 1.2rem;
  margin: 16px 16px 8px;
  color: var(--text-dark);
}

.patent-card .patent-number {
  color: var(--primary);
  font-weight: 500;
  margin: 0 16px 8px;
  font-size: 0.95rem;
}

.patent-card .patent-desc {
  color: var(--text-light);
  font-size: 0.95rem;
  margin: 0 16px 16px;
  line-height: 1.5;
}

/* ================================================================
   十六、飘动元素
   ================================================================ */
.floating-element {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.8;
  transition: none;
}

.floating-element img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }

  header .container {
    padding: 0 12px;
  }

  nav {
    gap: 0 10px;
  }

  nav a {
    font-size: 0.85rem;
    padding: 6px 0;
  }

  .logo {
    font-size: 0.9rem;
    gap: 6px;
  }

  .logo img {
    height: 26px;
  }

  #banner h1 {
    font-size: 2rem;
  }

  #banner p {
    font-size: 1rem;
  }

  .btn-primary {
    padding: 12px 30px;
    font-size: 0.9rem;
  }

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

  .section-subtitle {
    font-size: 1rem;
  }

  #about {
    padding: 60px 0;
  }

  #about .text h2 {
    font-size: 1.5rem;
  }

  #about .text p {
    font-size: 0.95rem;
  }

  .value-card h4 {
    font-size: 1.8rem;
  }

  .value-card p {
    font-size: 1.1rem;
  }

  .stat-item .number {
    font-size: 2.2rem;
  }

  .stats-grid {
    gap: 20px;
  }

  .category-grid,
  .product-grid,
  .video-list-grid,
  .patent-grid {
    gap: 16px;
  }

  .category-card img {
    height: 160px;
  }

  .patent-card img {
    height: 200px;
  }

  .client-logos img {
    height: 40px;
    max-width: 90px;
  }

  .client-logos img.logo-large {
    height: 55px;
    max-width: 120px;
  }

  .contact-item {
    font-size: 0.9rem;
  }

  .contact-item i {
    font-size: 1.4rem;
    width: 36px;
  }

  footer {
    padding: 20px 0;
  }

  footer .footer-links a {
    font-size: 0.85rem;
    margin: 0 8px;
  }
}