/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #165DFF;
  --primary-light: #4080FF;
  --primary-dark: #0E42D2;
  --secondary-color: #0FC6C2;
  --accent-color: #722ED1;
  --success-color: #00B42A;
  --warning-color: #FF7D00;
  --danger-color: #F53F3F;
  --text-dark: #1D2129;
  --text-medium: #4E5969;
  --text-light: #86909C;
  --bg-light: #F2F3F5;
  --bg-medium: #E5E6EB;
  --bg-dark: #1D2129;
  --white: #ffffff;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 按钮样式 */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  font-weight: 600;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--white);
  color: var(--primary-color);
  box-shadow: 0 4px 6px -1px rgba(30, 64, 175, 0.4);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 8px -1px rgba(30, 64, 175, 0.5);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--primary-light);
  color: var(--white);
  transform: translateY(-2px);
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.25rem 0;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(8px);
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 0.75rem 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: white;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-links a:hover:after,
.nav-links a.active:after {
  width: 100%;
}

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

.hamburger {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: white;
}

/* 英雄区域样式 */
.hero-features {
  list-style: none;
  margin: 1.5rem 0 2.5rem 0;
  padding: 0;
  color: white;
  font-family: 'Inter', sans-serif;
}

.hero-features li {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero-features li:before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--secondary-color);
  font-weight: bold;
  font-size: 1.2rem;
}

.hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  background-size: 600% 600%;
  animation: gradientShift 8s ease infinite;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 30%),
                    radial-gradient(circle at 80% 60%, rgba(255, 255, 255, 0.1) 0%, transparent 40%),
                    radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.12) 0%, transparent 35%),
                    linear-gradient(45deg, rgba(79, 70, 229, 0.2) 0%, transparent 50%),
                    linear-gradient(135deg, rgba(236, 72, 153, 0.15) 0%, transparent 50%);
  background-size: 120% 120%;
  animation: bgShift 20s ease infinite;
}

/* 网格背景 */
/* 取消网格背景 */
/* .grid-pattern {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 20px 20px;
  z-index: 0;
  opacity: 0.7;
  animation: gridMove 20s linear infinite;
} */

/* 专业统计学背景图案 */
.stat-pattern-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
}

/* 坐标轴基础样式 */
.axis {
  position: absolute;
  background-color: rgba(255, 255, 255, 0.1);
}

.axis-x {
  height: 1px;
  width: 80%;
  bottom: 10px;
  left: 10%;
}

.axis-y {
  width: 1px;
  height: 80%;
  top: 10%;
  left: 10%;
}

.axis-tick {
  position: absolute;
  background-color: rgba(255, 255, 255, 0.1);
  width: 5px;
  height: 1px;
  bottom: 0;
}

.axis-label {
  position: absolute;
  color: rgba(255, 255, 255, 0.15);
  font-size: 12px;
  transform: translateX(-50%);
  bottom: -15px;
}

/* 正态分布图 */
.normal-distribution {
  position: absolute;
  width: 35%;
  height: 30%;
  bottom: 10%;
  left: 10%;
  opacity: 0.85;
}

.distribution-curve {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.08) 100%);
  clip-path: path('M0,100 Q25,20 50,60 T100,100 L100,100 Z');
  animation: floatSlow 15s ease-in-out infinite;
}

.distribution-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: none;
  border-left: none;
  border-right: none;
  clip-path: path('M0,100 Q25,20 50,60 T100,100');
}

/* 折线图 */
.line-chart {
  position: absolute;
  width: 35%;
  height: 30%;
  top: 15%;
  right: 10%;
  opacity: 0.85;
}

.chart-line {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.05) 100%);
  transform-origin: left center;
}

.chart-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  z-index: 1;
}

.dot-a { top: 40%; left: 10%; }
.dot-b { top: 25%; left: 30%; }
.dot-c { top: 55%; left: 50%; }
.dot-d { top: 35%; left: 70%; }
.dot-e { top: 60%; left: 90%; }

/* 回归公式 */
.regression-formula {
  position: absolute;
  font-family: 'Arial', sans-serif;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.18);
  top: 55%;
  right: 15%;
  opacity: 0.8;
}

/* 统计符号 */
.stat-marker {
  position: absolute;
  font-family: 'Arial', sans-serif;
  font-size: 24px;
  color: rgba(255, 255, 255, 0.15);
  font-weight: bold;
}

.marker-mean { top: 15%; left: 15%; }
.marker-std { bottom: 15%; right: 15%; }

/* 动画效果 */
@keyframes floatSlow {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes lineMove {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 100% 50%;
  }
}

.chart-line { animation: lineMove 10s linear infinite; }

/* 箱线图 */
.box-plot {
  position: absolute;
  width: 20%;
  height: 20%;
  top: 50%;
  left: 15%;
  opacity: 0.8;
}

.box-container {
  position: absolute;
  bottom: 0;
  left: 30%;
  width: 40%;
  height: 70%;
  border: 2px solid rgba(255, 255, 255, 0.15);
  background-color: rgba(255, 255, 255, 0.03);
}

.box-median {
  position: absolute;
  bottom: 35%;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: rgba(255, 255, 255, 0.25);
}

.box-whisker-top {
  position: absolute;
  bottom: 70%;
  left: 50%;
  width: 2px;
  height: 20%;
  background-color: rgba(255, 255, 255, 0.15);
  transform: translateX(-50%);
}

.box-whisker-bottom {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 2px;
  height: 30%;
  background-color: rgba(255, 255, 255, 0.15);
  transform: translateX(-50%);
}

/* 统计符号 */
.stat-marker {
  position: absolute;
  font-family: 'Arial', sans-serif;
  font-size: 42px;
  color: rgba(255, 255, 255, 0.15);
  font-weight: bold;
  opacity: 0.8;
}

.marker-mean { top: 15%; left: 20%; }
.marker-std { bottom: 25%; right: 15%; }

/* 轻微动画效果 */
@keyframes pulse {
  0%, 100% {
    opacity: 0.7;
  }
  50% {
    opacity: 0.9;
  }
}

.chart-bar, .data-dot, .box-container { animation: pulse 5s ease-in-out infinite; }

/* 连接线 */
.data-points::after {
  content: '';
  position: absolute;
  top: 10%;
  left: 10%;
  width: 80%;
  height: 50%;
  background: none;
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
  z-index: -1;
  animation: morphSlow 12s ease-in-out infinite;
}

/* 统计符号 */
.stat-symbol {
  position: absolute;
  font-family: 'Arial', sans-serif;
  font-size: 40px;
  color: rgba(255, 255, 255, 0.1);
  font-weight: bold;
  opacity: 0.6;
  animation: rotateSlow 18s linear infinite;
}

.symbol-1 {
  top: 25%;
  left: 20%;
  transform: rotate(15deg);
}

.symbol-2 {
  bottom: 20%;
  right: 25%;
  transform: rotate(-10deg);
  animation-delay: 1s;
}

/* 动画效果 */
@keyframes floatSlow {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-15px) rotate(2deg);
  }
}

@keyframes barPulse {
  0%, 100% {
    height: var(--original-height);
    opacity: 0.7;
  }
  50% {
    height: calc(var(--original-height) * 1.15);
    opacity: 0.9;
  }
}

@keyframes morphSlow {
  0% {
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
  }
  50% {
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  }
  100% {
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
  }
}

@keyframes rotateSlow {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes gridMove {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 20px 20px;
  }
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes bgShift {
  0% {
    background-position: 0% 0%;
  }
  25% {
    background-position: 100% 25%;
  }
  50% {
    background-position: 0% 50%;
  }
  75% {
    background-position: 100% 75%;
  }
  100% {
    background-position: 0% 0%;
  }
}


.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  padding: 2rem 0;
  animation: fadeInUp 1s ease-out;
}

.btn-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  margin-left: 1rem;
  background-color: transparent;
  color: white;
  border: 1px solid white;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 0.9;
    transform: translateX(0);
  }
}

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

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: white;
  white-space: nowrap;
  display: inline-block;
  font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}



.typing-animation {
  overflow: hidden;
  border-right: 0.15em solid var(--primary-color);
  white-space: nowrap;
  margin: 0 auto;
  letter-spacing: 0.15em;
  animation: typing 3.5s steps(40, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
  from { width: 0 }
  to { width: 100% }
}

@keyframes blink-caret {
  from, to { border-color: transparent }
  50% { border-color: var(--primary-color); }
}

.subtitle-animation {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s ease-out 1.5s forwards;
}

.pulse-animation {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(22, 93, 255, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(22, 93, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(22, 93, 255, 0);
  }
}

.particle-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2.5rem;
  max-width: 600px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* 通用章节样式 */
.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--primary-dark);
  position: relative;
  display: inline-block;
}

.section-title.software-entry {
  font-size: 1.8rem;
  margin: 1rem 0;
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-light);
  text-align: center;
  max-width: 700px;
  margin: 0 auto 2.5rem;
}

/* 产品展示样式 */
.products {
  padding: 4rem 0;
  background-color: var(--white);
}/* 软件简介样式 */
.software-intro {
  padding: 6rem 0;
  background-color: var(--bg-light);
}

.software-intro-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
  background-color: var(--white);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.title-container {
  position: relative;
  margin: 1.5rem 0 1rem;
  padding: 0.5rem 0;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
  border-radius: 0.5rem;
  overflow: hidden;
}

.title-container h3 {
  font-size: 1.75rem;
  color: var(--white);
  margin: 0;
  padding: 0.75rem 1.5rem;
  position: relative;
  z-index: 1;
}

.software-intro h4 {
  font-size: 1.25rem;
  color: var(--text-dark);
  margin: 1.5rem 0 1rem;
}

.software-intro p {
  margin-bottom: 1.2rem;
  line-height: 1.7;
  color: var(--text-medium);
}

.software-intro ul {
  margin: 1rem 0 1.5rem 1.5rem;
}

.software-intro li {
  margin-bottom: 0.8rem;
  color: var(--text-medium);
}

.software-intro strong {
  color: var(--text-dark);
}

/* 高亮框样式 */
.highlight-box {
  padding: 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.highlight-box:hover {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.primary-highlight {
  border-left: 4px solid var(--primary-color);
  background-color: rgba(22, 93, 255, 0.03);
}

.secondary-highlight {
  border-left: 4px solid var(--secondary-color);
  background-color: rgba(15, 198, 194, 0.03);
}

/* 表格样式 */
.features-table-container, .advantages-table-container {
  margin: 1.5rem 0 2.5rem;
  overflow-x: auto;
}

.features-table, .advantages-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.features-table th,
.features-table td,
.advantages-table th,
.advantages-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--bg-medium);
}

.features-table thead,
.advantages-table thead {
  background-color: var(--primary-color);
  color: var(--white);
}

.features-table tbody tr:nth-child(even),
.advantages-table tbody tr:nth-child(even) {
  background-color: var(--bg-light);
}

.features-table tbody tr:hover,
.advantages-table tbody tr:hover {
  background-color: rgba(22, 93, 255, 0.05);
  transition: var(--transition);
}

.features-table td:first-child,
.advantages-table td:first-child {
  font-weight: 600;
  color: var(--primary-dark);
}

/* 产品卡片样式 */
.product-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.product-card {
  background-color: var(--white);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  text-align: left;
  display: block;
  text-decoration: none;
}

.product-card * {
  pointer-events: none;
}

.product-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  opacity: 0.95;
}

.product-card:nth-child(1) {
  border-top: 5px solid var(--primary-color);
}

.product-card:nth-child(2) {
  border-top: 5px solid var(--accent-color);
}

.product-card.featured {
  transform: translateY(-5px);
  cursor: pointer;
}

.product-card.featured:hover {
  transform: translateY(-15px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.product-card:nth-child(3) {
  border-top: 5px solid var(--secondary-color);
}

.product-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: var(--accent-color);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.product-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 2.5rem;
}

.product-card:nth-child(1) .product-icon {
  background-color: rgba(22, 93, 255, 0.1);
  color: var(--primary-color);
}

.product-card:nth-child(2) .product-icon {
  background-color: rgba(114, 46, 209, 0.1);
  color: var(--accent-color);
}

.product-card:nth-child(3) .product-icon {
  background-color: rgba(15, 198, 194, 0.1);
  color: var(--secondary-color);
}

.product-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}

.product-card p {
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.product-features {
  list-style: none;
  margin-bottom: 1rem;
  text-align: left;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 1rem;
}

.product-features li {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  color: var(--text-dark);
}

.product-features i {
  color: var(--success-color);
  margin-right: 0.75rem;
}

/* 功能特点样式 */
.features {
  padding: 8rem 0;
  background-color: var(--bg-light);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-item {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: left;
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.75rem;
}

.feature-item:nth-child(6n+1) .feature-icon {
  background-color: rgba(22, 93, 255, 0.1);
  color: var(--primary-color);
}

.feature-item:nth-child(6n+2) .feature-icon {
  background-color: rgba(15, 198, 194, 0.1);
  color: var(--secondary-color);
}

.feature-item:nth-child(6n+3) .feature-icon {
  background-color: rgba(114, 46, 209, 0.1);
  color: var(--accent-color);
}

.feature-item:nth-child(6n+4) .feature-icon {
  background-color: rgba(0, 180, 42, 0.1);
  color: var(--success-color);
}

.feature-item:nth-child(6n+5) .feature-icon {
  background-color: rgba(255, 125, 0, 0.1);
  color: var(--warning-color);
}

.feature-item:nth-child(6n+6) .feature-icon {
  background-color: rgba(245, 63, 63, 0.1);
  color: var(--danger-color);
}

.feature-item h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.feature-item p {
  color: var(--text-light);
}

/* 视频教程样式 */
.users {
  padding: 8rem 0;
  background-color: var(--bg-light);
}

.video-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 3rem;
  margin-top: 2rem;
}

.video-item {
  background-color: var(--white);
  padding: 1.5rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  overflow: hidden;
}

.video-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

.video-item h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
  text-align: center;
}

.video-item iframe {
  border-radius: 0.5rem;
  overflow: hidden;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .video-container {
    grid-template-columns: 1fr;
  }
}

.user-type:nth-child(3) .user-icon {
  background-color: rgba(15, 198, 194, 0.1);
  color: var(--secondary-color);
}

.user-type h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.user-type p {
  color: var(--text-light);
}

/* 已发表SCI论文列表样式 */
.papers {
  padding: 8rem 0;
  background-color: var(--white);
  text-align: center;
}

.papers-container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--bg-light);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  display: block;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--bg-medium);
  text-align: center;
}

.papers-image {
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  max-height: none !important;
  display: block !important;
  margin: 0 auto !important;
  border-radius: 0.5rem;
  transition: all 0.5s ease;
  object-fit: cover !important;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  overflow: hidden;
}

.papers-image:hover {
  transform: scale(1.02);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

/* 行动召唤样式 */
.cta {
  padding: 8rem 0;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.1) 0%, transparent 20%),
                    radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 30%);
  animation: gradientMove 15s ease infinite;
}

.cta .container {
  position: relative;
  z-index: 1;
}

.cta h2 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.cta p {
  font-size: 1.25rem;
  margin-bottom: 3rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0.9;
}

.qrcode-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  max-width: 400px;
  margin: 0 auto;
}

.qrcode-image {
  width: 200px;
  height: 200px;
  object-fit: contain;
  margin-bottom: 1.5rem;
  border: 5px solid white;
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.qrcode-text {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: white;
}

.qrcode-description {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 300px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.cta .btn-primary {
  background-color: var(--white);
  color: var(--primary-color);
}

.cta .btn-primary:hover {
  background-color: rgba(255, 255, 255, 0.9);
}

.cta .btn-secondary {
  background-color: transparent;
  color: var(--white);
  border-color: var(--white);
}

.cta .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* 页脚样式 */
.footer {
  background-color: var(--bg-dark);
  color: var(--white);
  padding: 5rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo {
  max-width: 250px;
}

.footer-logo .logo {
  color: var(--white);
  margin-bottom: 1rem;
}

.footer-logo p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-links h4 {
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-links h4:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--primary-light);
}

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

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 5px;
}

.social-icons {
  display: flex;
  gap: 1rem;
}

.social-icons a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  transition: var(--transition);
}

.social-icons a:hover {
  background-color: var(--primary-light);
  transform: translateY(-3px);
  padding-left: 0;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.75rem;
  }

  .section-title {
    font-size: 2.25rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    align-items: center;
    background-color: var(--white);
    padding: 2rem 0;
    gap: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    transform: translateY(-150%);
    transition: var(--transition);
    z-index: 999;
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .hamburger {
    display: block;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero p {
    font-size: 1.125rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .product-cards,
  .feature-grid,
  .user-types {
    grid-template-columns: 1fr;
  }

  .product-card.featured {
    transform: translateY(0);
  }

  .product-card:hover {
    transform: translateY(-5px);
  }
}

@media (max-width: 576px) {
  .hero h1 {
    font-size: 1.875rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

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

  .btn-primary,
  .btn-secondary {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
  }
}

/* 动画效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 0.8s ease-out forwards;
  opacity: 0;
}

.delay-1 {
  animation-delay: 0.2s;
}

.delay-2 {
  animation-delay: 0.4s;
}

.delay-3 {
  animation-delay: 0.6s;
}

/* VIP模态窗口样式 */
/* 标题样式 */
.vip-title {
  font-size: 1.8rem;
  text-align: center;
  color: #2c3e50;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #3498db;
}

.vip-tag {
  background-color: #3498db;
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.9rem;
  margin-left: 0.5rem;
}

/* 登录按钮样式 */
.vip-btn {
  background-color: #3498db;
  color: white;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.vip-btn:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.vip-btn i {
  margin-right: 8px;
}

/* 价格卡片样式 */
.blue-border {
  border: 2px solid #3498db !important;
}

/* 信息卡片样式 */
.info-card {
  background-color: #f8f9fa;
  border-radius: 10px;
  padding: 20px;
  margin: 20px 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  border-left: 4px solid #3498db;
}

/* VIP模态窗口样式 */
.modal {
  /* 已有样式保持不变 */
  display: none;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  overflow-y: auto;
}

.modal-content {
  background-color: #fefefe;
  margin: 5% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
  max-width: 900px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  position: relative;
}

.close-btn {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close-btn:hover {
  color: #333;
}

/* 登录按钮样式 */
.vip-login-top, .vip-login-bottom {
  text-align: center;
  margin: 20px 0;
}

.vip-login-top .btn-primary.large, .vip-login-bottom .btn-primary.large {
  font-size: 1.25rem;
  padding: 15px 30px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
}

.vip-login-top .btn-primary.large:hover, .vip-login-bottom .btn-primary.large:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* 价格卡片样式 */
.pricing-cards-row {
  display: flex;
  justify-content: space-between;
  margin: 30px 0;
  flex-wrap: wrap;
}

.pricing-card {
  flex: 1;
  min-width: 200px;
  margin: 0 10px;
  padding: 15px;
  border: 2px solid #ddd;
  border-radius: 10px;
  text-align: center;
  background-color: #f9f9f9;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}



.pricing-card h3 {
  margin-top: 0;
  color: #333;
}

.price {
  margin: 15px 0;
}

.original-price {
  text-decoration: line-through;
  color: #777;
  margin-right: 10px;
}

.current-price {
  font-size: 1.5em;
  font-weight: bold;
  color: #f44336;
}

.popular-tag {
  position: absolute;
  top: -10px;
  right: 20px;
  background-color: #FF9800;
  color: white;
  padding: 5px 10px;
  border-radius: 5px;
  font-weight: bold;
}

.popular {
  position: relative;
  border-color: #FF9800;
}

/* VIP信息样式 */
.vip-info, .login-issues {
  margin: 20px 0;
  line-height: 1.6;
}

.login-issues h3 {
  margin-top: 0;
}

.login-issues ol {
  padding-left: 20px;
}

.login-issues li {
  margin-bottom: 10px;
}

.wechat-qr-code {
  text-align: center;
  margin-top: 20px;
}

.qr-code-img {
  width: 180px;
  height: 180px;
  border: 1px solid #ddd;
  padding: 10px;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  margin-bottom: 10px;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .pricing-cards-row {
    flex-direction: column;
    align-items: center;
  }

  .pricing-card {
    width: 80%;
    margin-bottom: 20px;
  }
}

/* VIP模态窗口样式 */
.modal {
  display: none;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  overflow: auto;
}

.modal-content {
  background-color: #fff;
  margin: 5% auto;
  padding: 2rem;
  border-radius: 1rem;
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from {opacity: 0; transform: translateY(-20px);}
  to {opacity: 1; transform: translateY(0);}
}

.close-btn {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 2rem;
  font-weight: bold;
  color: #888;
  cursor: pointer;
  transition: color 0.3s;
}

.close-btn:hover {
  color: #333;
}

.modal-content h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  text-align: center;
}

.vip-info {
  margin-bottom: 2rem;
}

.vip-info p {
  margin-bottom: 1rem;
  line-height: 1.6;
}

.login-issues {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: #f9f9f9;
  border-radius: 0.5rem;
}

.login-issues h3 {
  margin-bottom: 1rem;
  color: var(--primary-dark);
}

.login-issues ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.login-issues li {
  margin-bottom: 0.5rem;
}

.pricing-cards {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.pricing-card {
  background-color: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 0.8rem;
  padding: 1.5rem;
  width: 100%;
  max-width: 250px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
}



.pricing-card.popular {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px var(--primary-color);
}

.popular-tag {
  position: absolute;
  top: -10px;
  right: 20px;
  background-color: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.pricing-card h3 {
  margin-bottom: 1rem;
  color: #333;
}

.price {
  margin-bottom: 1rem;
}

.original-price {
  text-decoration: line-through;
  color: #888;
  margin-right: 0.5rem;
}

.current-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.pricing-card p {
  margin-bottom: 1.5rem;
  color: #666;
}

.vip-login-btn {
  text-align: center;
  margin-top: 2rem;
}

.btn-primary.large {
  padding: 0.875rem 2rem;
  font-size: 1.125rem;
}

/* 滚动到顶部按钮 */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 999;
}

.scroll-to-top.active {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
}