/* ============================================
   新聚程科技 - 全局样式
   现代科技风 / 响应式 / 无框架依赖
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  /* 主色调 - 科技蓝青 */
  --color-primary: #00d4ff;
  --color-primary-dark: #0099cc;
  --color-secondary: #6c63ff;
  --color-accent: #00ffc8;

  /* 文字色 */
  --color-text: #2c3e50;
  --color-text-light: #6b7c93;
  --color-text-lighter: #95a5a6;
  --color-heading: #1a2332;

  /* 背景色 */
  --color-bg: #ffffff;
  --color-bg-gray: #f5f7fa;
  --color-bg-dark: #0a1628;
  --color-bg-footer: #0d1b2a;

  /* 边框/分割线 */
  --color-border: #e8ecf1;
  --color-border-light: #f0f3f7;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(10, 22, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 22, 40, 0.08);
  --shadow-lg: 0 16px 48px rgba(10, 22, 40, 0.12);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 间距 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;

  /* 容器 */
  --container-max: 1200px;
  --nav-height: 70px;

  /* 过渡 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC',
    'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
 
}

/* ---------- 通用容器 ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-2xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-title h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title p {
  color: var(--color-text-light);
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
}

/* ---------- 导航栏 ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.site-nav.scrolled {
  height: 60px;
  background: rgba(10, 22, 40, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.nav-container {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo img {
  height: 40px;
  width: auto;
  transition: height var(--transition-normal);
}

.site-nav.scrolled .nav-logo img {
  height: 34px;
}

.nav-menu {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.nav-link {
  position: relative;
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
}

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

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero Banner ---------- */
.hero {
  position: relative;
  height: clamp(300px, 50vw, 600px);
  min-height: 300px;
  overflow: hidden;
  margin-top: var(--nav-height);
  background: var(--color-bg-dark);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../img/hero-banner.jpg');
  background-size: cover;
  background-position: center;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 40, 0.3) 0%,
    rgba(10, 22, 40, 0.7) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #fff;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  line-height: 1.8;
  animation: fadeInUp 0.8s 0.15s both cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-buttons {
  margin-top: var(--space-md);
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.3s both cubic-bezier(0.4, 0, 0.2, 1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.45);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ---------- 分类区块 ---------- */
.category-section {
  padding: var(--space-xl) 0;
}

.category-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--color-heading);
}

.category-title::before {
  content: '';
  width: 4px;
  height: 28px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  border-radius: 2px;
}

/* ---------- 作品卡片网格 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.video-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s forwards cubic-bezier(0.4, 0, 0.2, 1);
}

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

.video-card-thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-gray);
}

.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.video-card:hover .video-card-thumb img {
  transform: scale(1.08);
}

.video-card-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 22, 40, 0);
  transition: background var(--transition-normal);
}

.video-card:hover .video-card-play {
  background: rgba(10, 22, 40, 0.4);
}

.video-card-play svg {
  width: 56px;
  height: 56px;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition-normal);
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

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

.video-card-caption {
  padding: var(--space-sm);
  text-align: center;
}

.video-card-caption h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-heading);
  transition: color var(--transition-fast);
}

.video-card:hover .video-card-caption h4 {
  color: var(--color-primary-dark);
}

/* ---------- 作品展示区域 ---------- */
.works-area {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-gray);
}

.works-section {
  padding-bottom: var(--space-xl);
}

.works-section:last-child {
  padding-bottom: 0;
}

/* 锚点导航偏移：避免固定导航遮挡板块标题 */
section[id] {
  scroll-margin-top: calc(var(--nav-height) + 16px);
}

/* ---------- 首页特色 ---------- */
.features {
  background: var(--color-bg-gray);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.feature-card {
  background: #fff;
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--color-border-light);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-sm);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(108, 99, 255, 0.1));
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  fill: var(--color-primary-dark);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-xs);
}

.feature-card p {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---------- 关于/联系方式 ---------- */
.about-section {
  background: var(--color-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-text p {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  line-height: 1.9;
}

.about-list li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.about-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-primary-dark);
  font-weight: 700;
}

.contact-card {
  background: linear-gradient(135deg, var(--color-bg-dark), #142238);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  color: #fff;
  box-shadow: var(--shadow-lg);
}

.contact-card h3 {
  color: #fff;
  font-size: 1.4rem;
  margin-bottom: var(--space-md);
}

.contact-list li {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-label {
  color: var(--color-primary);
  font-weight: 600;
  min-width: 70px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  color: rgba(255, 255, 255, 0.8);
  overflow: hidden;
}

.footer-bg {
  position: absolute;
  inset: 0;
  background-image: url('../img/footer-bg.jpg');
  background-size: cover;
  background-position: center bottom;
}

.footer-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(13, 27, 42, 0.85) 0%,
    rgba(13, 27, 42, 0.95) 100%
  );
}

.footer-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md) var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-title {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  position: relative;
  padding-bottom: 8px;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.footer-tagline {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 4px;
  line-height: 1.8;
}

.footer-list li {
  font-size: 0.9rem;
  padding: 4px 0;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-label {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ---------- 视频弹窗 ---------- */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: var(--space-md);
}

.video-modal.open {
  opacity: 1;
  visibility: visible;
}

.video-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.video-modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 10;
  line-height: 1;
}

.video-modal-close:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: rotate(90deg);
}

.video-modal-content {
  position: relative;
  z-index: 5;
  width: 100%;
  max-width: 960px;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.video-modal.open .video-modal-content {
  transform: scale(1);
}

.video-modal-content video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 入场动画延迟类 */
.delay-1 {
  animation-delay: 0.1s !important;
}
.delay-2 {
  animation-delay: 0.2s !important;
}
.delay-3 {
  animation-delay: 0.3s !important;
}
.delay-4 {
  animation-delay: 0.4s !important;
}
.delay-5 {
  animation-delay: 0.5s !important;
}
.delay-6 {
  animation-delay: 0.6s !important;
}
.delay-7 {
  animation-delay: 0.7s !important;
}
.delay-8 {
  animation-delay: 0.8s !important;
}

/* ---------- 响应式 - 大屏 ---------- */
@media (max-width: 1200px) {
  .video-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

/* ---------- 响应式 - 平板 ---------- */
@media (max-width: 992px) {
  :root {
    --space-2xl: 64px;
    --space-xl: 48px;
  }

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

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* ---------- 响应式 - 平板竖 ---------- */
@media (max-width: 768px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 260px;
    height: 100vh;
    flex-direction: column;
    gap: 0;
    padding-top: 80px;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    transition: right var(--transition-normal);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-link {
    padding: 16px 24px;
    font-size: 1rem;
    border-radius: 0;
  }

  .nav-link.active::after {
    left: 24px;
    transform: none;
    bottom: 8px;
  }

  .hero {
    height: clamp(280px, 60vw, 450px);
  }

  .hero-title {
    font-size: clamp(1.6rem, 6vw, 2.5rem);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .features-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .feature-card {
    padding: var(--space-md) var(--space-sm);
  }
}

/* ---------- 响应式 - 手机 ---------- */
@media (max-width: 480px) {
  :root {
    --space-2xl: 48px;
    --space-xl: 32px;
    --space-lg: 28px;
    --nav-height: 60px;
  }

  .video-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .video-card-caption {
    padding: 10px 8px;
  }

  .video-card-caption h4 {
    font-size: 0.85rem;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }

  .category-title {
    margin-bottom: var(--space-md);
  }

  .contact-card {
    padding: var(--space-md);
  }

  .video-modal-close {
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }
}

/* ---------- 工具类 ---------- */
.text-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0;
}
.mb-1 {
  margin-bottom: var(--space-xs);
}
.mb-2 {
  margin-bottom: var(--space-sm);
}
.mb-3 {
  margin-bottom: var(--space-md);
}
.mb-4 {
  margin-bottom: var(--space-lg);
}
.mt-3 {
  margin-top: var(--space-md);
}

/* 减少动画（尊重用户偏好） */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}