/**
 * 星际网络 - 引流量·全域精准获客解决方案
 * 样式表设计系统
 * 
 * 设计原则：
 * - 现代专业风格，适合B2B营销服务
 * - 渐变色彩营造科技感和活力
 * - 卡片式布局，信息层次清晰
 * - 流畅的交互动效提升用户体验
 */

/* ============================================
   CSS 变量定义 - 设计系统核心
   与整站风格统一：橙色渐变主色调
   ============================================ */
:root {
  /* 主色调 - 橙色渐变（与整站统一） */
  --ll-primary: #F5A623;
  --ll-primary-dark: #E8941F;
  --ll-primary-light: #FFB84D;

  /* 辅助色 - 深橙色 */
  --ll-accent: #E85D04;
  --ll-accent-dark: #D15100;
  --ll-accent-light: #FF8C42;

  /* 渐变色（与整站统一） */
  --ll-gradient-primary: linear-gradient(135deg, #F5A623 0%, #FF8C42 50%, #E85D04 100%);
  --ll-gradient-accent: linear-gradient(135deg, #E85D04 0%, #F48C06 100%);
  --ll-gradient-hero: linear-gradient(135deg, #F5A623 0%, #E85D04 50%, #F48C06 100%);
  --ll-gradient-card: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);

  /* 中性色 */
  --ll-text-primary: #333333;
  --ll-text-secondary: #666666;
  --ll-text-muted: #999999;
  --ll-bg-primary: #ffffff;
  --ll-bg-secondary: #f8f9fa;
  --ll-bg-dark: #1a1a1a;
  --ll-border: #e9ecef;
  --ll-border-light: #f1f5f9;

  /* 阴影系统 */
  --ll-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --ll-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --ll-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --ll-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --ll-shadow-glow: 0 0 40px rgba(245, 166, 35, 0.3);
  --ll-shadow-accent: 0 0 40px rgba(232, 93, 4, 0.3);

  /* 间距系统 */
  --ll-space-xs: 0.25rem;
  --ll-space-sm: 0.5rem;
  --ll-space-md: 1rem;
  --ll-space-lg: 1.5rem;
  --ll-space-xl: 2rem;
  --ll-space-2xl: 3rem;
  --ll-space-3xl: 4rem;
  --ll-space-4xl: 6rem;

  /* 圆角系统 */
  --ll-radius-sm: 0.375rem;
  --ll-radius-md: 0.5rem;
  --ll-radius-lg: 0.75rem;
  --ll-radius-xl: 1rem;
  --ll-radius-2xl: 1.5rem;
  --ll-radius-full: 9999px;

  /* 字体系统（与整站统一） */
  --ll-font-sans: 'verdana', sans-serif;
  --ll-font-display: 'verdana', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  /* 过渡动画 */
  --ll-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --ll-transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --ll-transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index 层级 */
  --ll-z-base: 0;
  --ll-z-dropdown: 100;
  --ll-z-sticky: 200;
  --ll-z-fixed: 300;
  --ll-z-modal: 400;
  --ll-z-popover: 500;
}

/* ============================================
   基础重置与通用样式
   ============================================ */
.liuliang {
  font-family: var(--ll-font-sans);
  color: var(--ll-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.liuliang *,
.liuliang *::before,
.liuliang *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

.liuliang a {
  text-decoration: none;
  /* color: inherit; */
}

.liuliang ul,
.liuliang ol {
  list-style: none;
}

/* ============================================
   页面标题区域 - Hero Section
   ============================================ */
.liuliang-hero {
  position: relative;
  min-height: 550px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ll-gradient-hero);
  overflow: hidden;
  padding: var(--ll-space-4xl) var(--ll-space-xl);
}


@media screen and (max-width: 767px) {
  .liuliang-hero {
    height: 300px;
  }
}

.liuliang-hero.liuliang-banner {
  background-image: url('../subbanner/2.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}


/* 背景装饰元素 - 橙色主题 */
/* .liuliang-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse, rgba(255, 140, 66, 0.3) 0%, transparent 70%);
  animation: ll-float 20s ease-in-out infinite;
} */

/* .liuliang-hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 60%;
  height: 100%;
  background: radial-gradient(ellipse, rgba(245, 166, 35, 0.25) 0%, transparent 60%);
  animation: ll-float 15s ease-in-out infinite reverse;
} */

@keyframes ll-float {

  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }

  33% {
    transform: translate(30px, -30px) rotate(5deg);
  }

  66% {
    transform: translate(-20px, 20px) rotate(-3deg);
  }
}

.liuliang-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
  text-align: center;
}

.liuliang-title {
  font-family: var(--ll-font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.2;
  margin-bottom: var(--ll-space-lg);
  /* text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3); */
  opacity: 0;
  transform: translateY(30px);
  animation: ll-fade-up 0.8s ease-out forwards;
}

.liuliang-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(30px);
  animation: ll-fade-up 0.8s ease-out 0.2s forwards;
}

@keyframes ll-fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   通用区块样式
   ============================================ */
.liuliang-section {
  padding: var(--ll-space-4xl) var(--ll-space-xl);
  position: relative;
}

.liuliang-section-inner {
  max-width: 1600px;
  margin: 0 auto;
}

.liuliang-section-header {
  text-align: center;
  margin-bottom: var(--ll-space-3xl);
}

.liuliang-section-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: var(--ll-gradient-primary);
  color: #ffffff;
  font-size: 1.5rem;
  font-weight: 700;
  border-radius: var(--ll-radius-full);
  margin-bottom: var(--ll-space-lg);
  box-shadow: var(--ll-shadow-glow);
  transition: transform var(--ll-transition-base);
}

.liuliang-section-num:hover {
  transform: scale(1.1) rotate(5deg);
}

.liuliang-section-title {
  font-family: var(--ll-font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--ll-text-primary);
  margin-bottom: var(--ll-space-md);
}

.liuliang-section-desc {
  font-size: 1rem;
  color: var(--ll-text-secondary);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================
   互联网推广类产品区块
   ============================================ */
.liuliang-promotion {
  background: var(--ll-bg-secondary);
}

.liuliang-promotion-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--ll-space-xl);
}

.liuliang-promotion-card {
  background: var(--ll-gradient-card);
  border-radius: var(--ll-radius-2xl);
  padding: var(--ll-space-2xl);
  box-shadow: var(--ll-shadow-md);
  border: 1px solid var(--ll-border-light);
  transition: all var(--ll-transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.liuliang-promotion-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--ll-gradient-primary);
  transform: scaleX(0);
  transition: transform var(--ll-transition-base);
}

.liuliang-promotion-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--ll-shadow-xl);
}

/* .liuliang-promotion-card:hover::before {
  transform: scaleX(1);
} */

.liuliang-card-icon {
  width: 64px;
  height: 64px;
  background: var(--ll-gradient-primary);
  border-radius: var(--ll-radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--ll-space-lg);
  transition: all var(--ll-transition-base);
}

.liuliang-card-icon svg {
  width: 32px;
  height: 32px;
  color: #ffffff;
}

.liuliang-promotion-card:hover .liuliang-card-icon {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--ll-shadow-glow);
}

.liuliang-promotion-card h3 {
  font-family: var(--ll-font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ll-text-primary);
  margin-bottom: var(--ll-space-sm);
}

.liuliang-promotion-card p {
  font-size: 0.95rem;
  color: var(--ll-text-secondary);
  line-height: 1.6;
}

/* ============================================
   短视频策划运营区块
   ============================================ */
.liuliang-video {
  background: var(--ll-bg-primary);
}

.liuliang-video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: var(--ll-space-lg);
  min-height: 500px;
}

.liuliang-video-card {
  background: var(--ll-bg-secondary);
  border-radius: var(--ll-radius-2xl);
  overflow: hidden;
  position: relative;
  transition: all var(--ll-transition-base);
  cursor: pointer;
  border: 1px solid var(--ll-border-light);
}

.liuliang-video-card-large {
  grid-column: span 2;
  grid-row: span 2;
  /* background: var(--ll-gradient-primary); */
  background-image: url('../subbanner/22.jpg');
  background-size: cover;
}

.liuliang-video-card-large .liuliang-video-tag {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.liuliang-video-card-wide {
  grid-column: span 2;
}

.liuliang-video-card-bg {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--ll-space-xl);
  /* background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.7) 100%); */
}

.liuliang-video-card-content {
  padding: var(--ll-space-lg);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.liuliang-video-card-large .liuliang-video-card-content {
  padding: var(--ll-space-xl);
  color: #ffffff;
}

.liuliang-video-tag {
  display: inline-block;
  background: var(--ll-gradient-accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--ll-space-xs) var(--ll-space-md);
  border-radius: var(--ll-radius-full);
  margin-bottom: var(--ll-space-md);
  width: fit-content;
}

.liuliang-video-card h3 {
  font-family: var(--ll-font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ll-text-primary);
  margin-bottom: var(--ll-space-sm);
}

.liuliang-video-card-large h3 {
  font-size: 1.5rem;
  color: #ffffff;
}

.liuliang-video-card p {
  font-size: 0.9rem;
  color: var(--ll-text-secondary);
  line-height: 1.5;
}

.liuliang-video-card-large p {
  color: rgba(255, 255, 255, 0.9);
}

.liuliang-video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--ll-shadow-lg);
}

.liuliang-video-card-large:hover {
  box-shadow: var(--ll-shadow-glow);
}

/* ============================================
   天助全域通区块
   ============================================ */
.liuliang-tianzhu {
  background: var(--ll-bg-secondary);
  position: relative;
  overflow: hidden;
}

.liuliang-tianzhu::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(245, 166, 35, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(232, 93, 4, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.liuliang-tianzhu-header {
  text-align: center;
  margin-bottom: var(--ll-space-3xl);
  position: relative;
  z-index: 1;
}

.liuliang-tianzhu-content {
  position: relative;
  z-index: 1;
}

.liuliang-tianzhu-main {
  max-width: 900px;
  margin: 0 auto;
}

.liuliang-tianzhu-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--ll-space-xl);
}

.liuliang-tianzhu-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--ll-space-lg);
  background: var(--ll-bg-primary);
  padding: var(--ll-space-xl);
  border-radius: var(--ll-radius-2xl);
  box-shadow: var(--ll-shadow-md);
  border: 1px solid var(--ll-border-light);
  transition: all var(--ll-transition-base);
}

.liuliang-tianzhu-feature:hover {
  transform: translateX(10px);
  box-shadow: var(--ll-shadow-lg);
  border-color: var(--ll-primary-light);
}

.liuliang-feature-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  background: var(--ll-gradient-primary);
  border-radius: var(--ll-radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--ll-transition-base);
}

.liuliang-feature-icon svg {
  width: 28px;
  height: 28px;
  color: #ffffff;
}

.liuliang-tianzhu-feature:hover .liuliang-feature-icon {
  transform: scale(1.1) rotate(10deg);
  box-shadow: var(--ll-shadow-glow);
}

.liuliang-feature-text h4 {
  font-family: var(--ll-font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ll-text-primary);
  margin-bottom: var(--ll-space-xs);
}

.liuliang-feature-text p {
  font-size: 0.95rem;
  color: var(--ll-text-secondary);
  line-height: 1.6;
}

/* ============================================
   CTA 行动号召区域
   ============================================ */
.liuliang-cta {
  /* background: var(--ll-gradient-hero); */
  padding: var(--ll-space-4xl) var(--ll-space-xl);
  background-image: url('../subbanner/33.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* .liuliang-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(245, 166, 35, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(232, 93, 4, 0.2) 0%, transparent 50%);
} */

.liuliang-cta-inner {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}

.liuliang-cta h2 {
  font-family: var(--ll-font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: #ffffff;
  margin-bottom: var(--ll-space-md);
}

.liuliang-cta p {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--ll-space-xl);
}

.liuliang-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--ll-space-md) var(--ll-space-2xl);
  background: #ffffff;
  /* color: var(--ll-primary-dark); */
  color: #ff8315;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--ll-radius-full);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: all var(--ll-transition-base);
  cursor: pointer;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

/* .liuliang-cta-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(245, 166, 35, 0.2), transparent);
  transition: left 0.5s;
} */

.liuliang-cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
  border-color: var(--ll-primary);
  /* color: var(--ll-primary); */
  color: #ff8315;
}

.liuliang-cta-btn:hover::before {
  left: 100%;
}

.liuliang-cta-btn:active {
  transform: translateY(-1px);
}

/* ============================================
   滚动动画类
   ============================================ */
.ll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.ll-animate.ll-visible {
  opacity: 1;
  transform: translateY(0);
}

.ll-animate-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.ll-animate-left.ll-visible {
  opacity: 1;
  transform: translateX(0);
}

.ll-animate-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.ll-animate-right.ll-visible {
  opacity: 1;
  transform: translateX(0);
}

.ll-animate-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.ll-animate-scale.ll-visible {
  opacity: 1;
  transform: scale(1);
}

/* 延迟动画 */
.ll-delay-1 {
  transition-delay: 0.1s;
}

.ll-delay-2 {
  transition-delay: 0.2s;
}

.ll-delay-3 {
  transition-delay: 0.3s;
}

.ll-delay-4 {
  transition-delay: 0.4s;
}

/* ============================================
   响应式设计
   ============================================ */

/* 平板设备 (768px - 1199px) */
@media (max-width: 1199px) {
  .liuliang-section {
    padding: var(--ll-space-3xl) var(--ll-space-lg);
  }

  .liuliang-video-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
    min-height: auto;
  }

  .liuliang-video-card-large {
    grid-column: span 2;
    grid-row: span 1;
    min-height: 300px;
  }

  .liuliang-video-card-wide {
    grid-column: span 2;
  }

  .liuliang-tianzhu-features {
    gap: var(--ll-space-lg);
  }
}

/* 移动设备 (< 768px) */
@media (max-width: 767px) {
  :root {
    --ll-space-4xl: 4rem;
    --ll-space-3xl: 3rem;
  }

  .liuliang-hero {
    min-height: 35vh;
    padding: var(--ll-space-3xl) var(--ll-space-md);
  }

  .liuliang-section {
    padding: var(--ll-space-3xl) var(--ll-space-md);
  }

  .liuliang-section-num {
    width: 50px;
    height: 50px;
    font-size: 1.25rem;
  }

  .liuliang-promotion-grid {
    grid-template-columns: 1fr;
    gap: var(--ll-space-lg);
  }

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

  .liuliang-video-card,
  .liuliang-video-card-large,
  .liuliang-video-card-wide {
    grid-column: span 1;
    min-height: 200px;
  }

  .liuliang-video-card-large {
    min-height: 280px;
  }

  .liuliang-tianzhu-features {
    grid-template-columns: 1fr;
    gap: var(--ll-space-md);
  }

  .liuliang-tianzhu-feature {
    flex-direction: column;
    text-align: center;
    padding: var(--ll-space-lg);
  }

  .liuliang-feature-icon {
    margin: 0 auto;
  }

  .liuliang-cta {
    padding: var(--ll-space-3xl) var(--ll-space-md);
  }

  .liuliang-cta-btn {
    width: 100%;
    max-width: 300px;
  }
}

/* 小屏移动设备 (< 480px) */
@media (max-width: 479px) {

  .liuliang-promotion-card,
  .liuliang-tianzhu-feature {
    padding: var(--ll-space-lg);
  }

  .liuliang-card-icon {
    width: 56px;
    height: 56px;
  }

  .liuliang-card-icon svg {
    width: 28px;
    height: 28px;
  }
}

/* ============================================
   无障碍与性能优化
   ============================================ */

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {

  .liuliang-hero::before,
  .liuliang-hero::after {
    animation: none;
  }

  .liuliang-title,
  .liuliang-subtitle {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .ll-animate,
  .ll-animate-left,
  .ll-animate-right,
  .ll-animate-scale {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .liuliang-promotion-card,
  .liuliang-video-card,
  .liuliang-tianzhu-feature,
  .liuliang-cta-btn {
    transition: none;
  }
}

/* 焦点状态 */
.liuliang-promotion-card:focus-visible,
.liuliang-video-card:focus-visible,
.liuliang-tianzhu-feature:focus-visible,
.liuliang-cta-btn:focus-visible {
  outline: 2px solid var(--ll-primary);
  outline-offset: 2px;
}

/* 悬停时标签颜色变化 */
.liuliang-promotion-card:hover .liuliang-card-icon,
.liuliang-tianzhu-feature:hover .liuliang-feature-icon {
  background: var(--ll-gradient-primary);
}

/* 打印样式 */
@media print {

  .liuliang-hero,
  .liuliang-cta {
    background: var(--ll-bg-secondary) !important;
    color: var(--ll-text-primary) !important;
  }

  .liuliang-title,
  .liuliang-cta h2 {
    color: var(--ll-text-primary) !important;
  }

  .liuliang-promotion-card,
  .liuliang-video-card,
  .liuliang-tianzhu-feature {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--ll-border);
  }
}