/* 基础样式 */
:root {
  --color-primary: #2563eb;
  --color-secondary: #6b7280;
  --color-background: #f8fafc;
  --color-text: #1f2937;
  --color-light: #e5e7eb;
  --color-white: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: all 0.3s ease;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  height: 40px;
  width: auto;
}

.brand-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: #2563eb;
}

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

.nav-link {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #2563eb;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #2563eb;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  z-index: 1001;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: #333;
  margin: 3px 0;
  transition: 0.3s;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 汉堡菜单动画已在上方定义，此处删除重复代码 */

/* 英雄区域 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.highlight {
  color: #fbbf24;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.stat-item {
  text-align: center;
  min-width: 120px;
  animation: fadeIn 0.8s ease-out;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: #ffffff;
  transition: all 0.3s ease;
  position: relative;
  display: inline-block;
  cursor: pointer;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.stat-number::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #ffffff;
  transform: scaleX(0);
  transition: transform 0.5s ease;
}

.stat-item:hover .stat-number::after {
  transform: scaleX(1);
}

.stat-number.completed {
  animation: pulse-once 0.5s ease-out;
  color: #fbbf24;
  text-shadow: 0 0 15px rgba(251, 191, 36, 0.7);
}

@keyframes pulse-once {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.8;
}

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

/* 圆形商业模式 */
.circular-model {
  position: relative;
  width: 400px;
  height: 400px;
  margin: 0 auto;
  overflow: visible;
  max-width: 100%;
}

.circle-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px); /* Safari 支持 */
  border: 2px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
  transition: background-color 1.5s ease, box-shadow 1.5s ease;
  animation: glow 3s infinite alternate;
  z-index: 10;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.2);
}

/* 闪烁灯光效果 */
.circle-center::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
  opacity: 0;
  animation: shine 5s infinite;
  pointer-events: none;
  z-index: 1;
}

.center-text {
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.2;
  transition: color 1.5s ease;
  text-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
  position: relative;
  z-index: 2;
  background: linear-gradient(45deg, #ff8a00, #ffcc00, #ffdd55);
  background-size: 200% 200%;
  border-radius: 50%;
  padding: 10px;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: sunGlow 3s infinite alternate, sunShine 5s infinite;
}

@keyframes sunGlow {
  0% {
    box-shadow: 0 0 10px rgba(255, 170, 0, 0.6);
    background-position: 0% 50%;
  }
  50% {
    box-shadow: 0 0 20px rgba(255, 170, 0, 0.8), 0 0 30px rgba(255, 170, 0, 0.4);
    background-position: 100% 50%;
  }
  100% {
    box-shadow: 0 0 15px rgba(255, 170, 0, 0.7), 0 0 25px rgba(255, 170, 0, 0.5);
    background-position: 0% 50%;
  }
}

@keyframes sunShine {
  0% {
    opacity: 0.8;
  }
  25% {
    opacity: 1;
  }
  50% {
    opacity: 0.9;
  }
  75% {
    opacity: 1;
  }
  100% {
    opacity: 0.8;
  }
}

/* 闪烁灯光动画 */
@keyframes shine {
  0% {
    transform: rotate(0deg);
    opacity: 0;
  }
  25% {
    opacity: 0.5;
  }
  50% {
    opacity: 0;
  }
  75% {
    opacity: 0.5;
  }
  100% {
    transform: rotate(360deg);
    opacity: 0;
  }
}

/* 发光动画效果 */
@keyframes glow {
  0% {
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
  }
  50% {
    box-shadow: 0 0 25px rgba(255, 255, 255, 0.8), 0 0 40px rgba(255, 255, 255, 0.4);
  }
  100% {
    box-shadow: 0 0 35px rgba(255, 255, 255, 0.9), 0 0 60px rgba(255, 255, 255, 0.5);
  }
}

.circle-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  transform-origin: center center;
}

.circle-item {
  position: absolute;
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  text-align: center;
  font-weight: 500;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 10px;
  line-height: 1.2;
  transition: all 0.3s ease;
  z-index: 1;
  transform-origin: center center;
}

.circle-item:hover {
  transform: scale(1.1) !important;
  background: rgba(255, 255, 255, 0.3);
  z-index: 2;
}

/* 轨道旋转动画 */
.rotating-track {
  animation: rotate 40s linear infinite;
  animation-play-state: running;
  position: relative;
  z-index: 5;
}

/* 文字反向旋转，保持朝上 */
.counter-rotate {
  animation: counter-rotate 40s linear infinite;
  animation-play-state: running;
}

.circular-model:hover .rotating-track,
.circular-model:hover .counter-rotate {
  animation-play-state: paused;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes counter-rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(-360deg);
  }
}

/* 通用区域样式 */
section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #1f2937;
}

.section-header p {
  font-size: 1.1rem;
  color: #6b7280;
  max-width: 600px;
  margin: 0 auto;
}

/* 核心理念 */
.concept {
  background: #f8fafc;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.concept-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.concept-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.concept-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.concept-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.concept-card p {
  color: #6b7280;
  line-height: 1.6;
}

/* 商业模式 */
.business-model {
  background: white;
}

/* 商业模式图解 */
.business-model-diagram {
  max-width: 900px;
  margin: 0 auto 4rem;
}

/* 商业模式图解中的连接器中心 */
.connector-center {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 20px 0;
}

.connector-center span {
  background: #2563eb;
  color: white;
  border-radius: 50%;
  width: 120px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.3;
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.5);
  animation: pulse-animation 2s infinite;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.model-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: #1f2937;
  text-align: center;
  position: relative;
  display: inline-block;
}

.model-title:after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: #2563eb;
  border-radius: 3px;
}

.model-diagram {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.diagram-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.diagram-row.reverse {
  direction: rtl;
}

.diagram-row.reverse .diagram-arrow {
  transform: scaleX(-1);
}

.diagram-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 1.5rem 0;
}

.connector-line {
  width: 2px;
  height: 30px;
  background: #2563eb;
  margin-bottom: 0.5rem;
}

.model-description {
  background: rgba(37, 99, 235, 0.05);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 6rem;
}

@media (max-width: 768px) {
  .model-description {
    margin-top: 2rem;
  }
}

.model-description p {
  color: #4b5563;
  line-height: 1.8;
  text-align: center;
}

.model-content {
  margin-top: 4rem;
}

.model-flow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.flow-step {
  flex: 1;
  min-width: 200px;
  text-align: center;
  padding: 1.5rem;
}

.flow-arrow {
  font-size: 1.5rem;
  color: #2563eb;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
}

.step-number {
  width: 50px;
  height: 50px;
  background: #2563eb;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 1rem;
}

.step-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #1f2937;
}

.step-content p {
  font-size: 0.9rem;
  color: #6b7280;
  line-height: 1.5;
}

.model-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: #f8fafc;
  padding: 2rem;
  border-radius: 12px;
}

.feature-card h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: #2563eb;
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* 商业模式图解中的卡片样式 */
.diagram-card {
  background: white;
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: center;
}

.diagram-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.diagram-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  width: 100%;
}

@media (max-width: 768px) {
  .diagram-icon {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .diagram-icon {
    font-size: 1.6rem;
  }
}

.diagram-content h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #1f2937;
}

.diagram-content p {
  font-size: 0.85rem;
  color: #6b7280;
  line-height: 1.4;
}

.diagram-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #2563eb;
}

/* 核心优势 */
.advantages {
  background: #f8fafc;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.advantage-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.advantage-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.advantage-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.advantage-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.advantage-card p {
  color: #6b7280;
  line-height: 1.6;
}

/* 挑战 */
.challenges {
  background: white;
}

.challenges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.challenge-card {
  background: #f8fafc;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.challenge-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.challenge-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.challenge-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.challenge-card p {
  color: #6b7280;
  line-height: 1.6;
}

/* 社会意义 */
.social-impact {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.impact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.impact-text {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.impact-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.impact-item p {
  color: #6b7280;
  line-height: 1.6;
}

.impact-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.impact-quote {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  position: relative;
}

.impact-quote::before {
  content: """;
  position: absolute;
  top: -20px;
  left: 20px;
  font-size: 5rem;
  color: rgba(37, 99, 235, 0.1);
  font-family: serif;
}

.impact-quote blockquote {
  font-style: italic;
  color: #4b5563;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

/* 公益传播计算器 */
.calculator {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  padding: 5rem 0;
}

/* 闪烁标语 */
.slogan-highlight {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin: 2rem auto;
  padding: 1rem;
  border-radius: 8px;
  background: linear-gradient(45deg, #2563eb, #3b82f6, #60a5fa);
  background-size: 200% 200%;
  color: white;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.5);
  animation: colorChange 5s infinite alternate, pulse 2s infinite, glow 1.5s infinite alternate;
  position: relative;
  overflow: hidden;
  letter-spacing: 1px;
}

.slogan-highlight::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: rgba(255, 255, 255, 0.1);
  transform: rotate(30deg);
  animation: shine 3s infinite;
}

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

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

@keyframes glow {
  0% { box-shadow: 0 0 5px rgba(37, 99, 235, 0.5); }
  100% { box-shadow: 0 0 20px rgba(37, 99, 235, 0.8), 0 0 30px rgba(37, 99, 235, 0.6); }
}

@keyframes shine {
  0% { transform: translateX(-100%) rotate(30deg); }
  100% { transform: translateX(100%) rotate(30deg); }
}

.calculator-container {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  max-width: 900px;
  margin: 0 auto;
}

.calculator-sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.calculator-slider {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.calculator-slider label {
  font-weight: 500;
  color: #1f2937;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.slider-value {
  font-weight: 600;
  color: #2563eb;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: #e5e7eb;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #2563eb;
  cursor: pointer;
  transition: all 0.2s ease;
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #2563eb;
  cursor: pointer;
  transition: all 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
}

.slider::-moz-range-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
}

.slider-hint {
  font-size: 0.8rem;
  color: #6b7280;
  margin-top: 0.5rem;
}

.calculator-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.result-card {
  background: #f8fafc;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s ease;
}

.result-card.highlight {
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.result-title {
  font-size: 1rem;
  font-weight: 500;
  color: #6b7280;
  margin-bottom: 0.5rem;
}

.result-value {
  font-size: 2rem;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 0.5rem;
}

.result-note {
  font-size: 0.8rem;
  color: #6b7280;
}

/* 脉动文字效果 */
.pulse-text {
  animation: pulse-animation 2s infinite;
  font-weight: 600;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.7);
  padding: 10px;
  border-radius: 50%;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* 闪光效果 */
.flash-effect {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
  animation: shine 3s infinite;
  pointer-events: none;
}

/* 数字动画效果 */
@keyframes countUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-animation {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

/* 响应式样式 */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-title {
    font-size: 2.8rem;
  }
  
  .circular-model {
    width: 350px;
    height: 350px;
    margin-top: 2rem;
  }
  
  .impact-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: white;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: right 0.3s ease;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .circular-model {
    width: 300px;
    height: 300px;
  }
  
  .circle-center {
    width: 100px;
    height: 100px;
  }
  
  .circle-item {
    width: 70px;
    height: 70px;
    font-size: 0.7rem;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
  
  .diagram-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .diagram-arrow {
    transform: rotate(90deg);
    margin: 1rem 0;
  }
  
  .diagram-row.reverse .diagram-arrow {
    transform: rotate(90deg);
  }
  
  .model-flow {
    flex-direction: column;
  }
  
  .flow-arrow {
    transform: rotate(90deg);
    margin: 1rem 0;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }
  
  .circular-model {
    width: 250px;
    height: 250px;
  }
  
  .circle-center {
    width: 80px;
    height: 80px;
    font-size: 0.8rem;
  }
  
  .circle-item {
    width: 60px;
    height: 60px;
    font-size: 0.6rem;
  }
  
  .stat-number {
    font-size: 1.5rem;
  }
  
  .section-header h2 {
    font-size: 1.8rem;
  }
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: -60px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #2563eb;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: bottom 0.3s ease, background 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  z-index: 99;
}

.back-to-top.visible {
  bottom: 30px;
}

.back-to-top:hover {
  background: #1d4ed8;
}

/* 参与方式 */
.participate {
  background: #f8fafc;
}

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

.participate-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.participate-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.participate-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.participate-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.participate-card p {
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.qr-codes {
  display: flex;
  justify-content: center;
  gap: 2rem;
}

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

.qr-item img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  margin-bottom: 0.5rem;
}

.qr-item span {
  font-size: 0.9rem;
  color: #6b7280;
}

.benefits {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.benefit {
  color: #059669;
  font-weight: 500;
}

.contact-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: center;
}

.contact-qr {
  width: 80px;
  height: 80px;
  border-radius: 8px;
}

.contact-details p {
  margin: 0.2rem 0;
  font-size: 0.9rem;
  color: #6b7280;
}

/* 声明 */
.statement {
  background: #1f2937;
  color: white;
}

.statement-content {
  max-width: 800px;
  margin: 0 auto;
}

.statement h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
  color: #fbbf24;
}

.statement-text p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
  font-size: 1rem;
}

.statement-highlight {
  background: rgba(251, 191, 36, 0.1);
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #fbbf24;
  margin-top: 2rem;
}

.statement-highlight p {
  margin: 0;
  font-weight: 500;
  color: #fbbf24;
}

/* 联系我们 */
.contact {
  background: white;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.contact-item {
  text-align: center;
  padding: 2rem;
  background: #f8fafc;
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.contact-item:hover {
  transform: translateY(-5px);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.contact-item h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.contact-item p {
  color: #6b7280;
  margin: 0.5rem 0;
}

/* 页脚 */
.footer {
  background: #1f2937;
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  height: 40px;
  width: auto;
}

.footer-brand p {
  color: #9ca3af;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
}

.footer-section h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #fbbf24;
}

.footer-section a {
  display: block;
  color: #9ca3af;
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-legal {
  flex: 1;
}

.footer-legal p {
  color: #9ca3af;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.footer-certificates {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: #9ca3af;
}

.separator {
  color: #6b7280;
}

.footer-copyright {
  color: #9ca3af;
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-stats {
    justify-content: center;
  }

  .circular-model {
    width: 300px;
    height: 300px;
  }

  .circle-item {
    width: 60px;
    height: 60px;
    font-size: 0.7rem;
    padding: 5px;
  }

  .circle-center {
    width: 100px;
    height: 100px;
  }

  .center-text {
    font-size: 0.9rem;
  }

  .model-flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    display: block;
    transform: rotate(90deg);
  }

  .impact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .qr-codes {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .contact-info {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  section {
    padding: 3rem 0;
  }

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

  .section-header h2 {
    font-size: 2rem;
  }

  .concept-grid,
  .advantages-grid,
  .participate-grid {
    grid-template-columns: 1fr;
  }

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

  .circular-model {
    width: 250px;
    height: 250px;
  }

  .circle-item {
    width: 50px;
    height: 50px;
    font-size: 0.6rem;
  }

  .circle-center {
    width: 80px;
    height: 80px;
  }

  .center-text {
    font-size: 0.8rem;
  }
}

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

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

/* 滚动动画 */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 选择文本样式 */
::selection {
  background: #2563eb;
  color: white;
}

::-moz-selection {
  background: #2563eb;
  color: white;
}

/* 社会意义 */
.social-impact {
  background: white;
}

.impact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.impact-item {
  margin-bottom: 2rem;
}

.impact-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #1f2937;
}

.impact-item p {
  color: #6b7280;
  line-height: 1.6;
}

.impact-quote {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 2rem;
  border-radius: 12px;
  color: white;
}

.impact-quote blockquote {
  font-size: 1.1rem;
  line-height: 1.8;
  font-style: italic;
  position: relative;
}

.impact-quote blockquote::before {
  content: '"';
  font-size: 4rem;
  position: absolute;
  top: -1rem;
  left: -1rem;
  opacity: 0.3;
}

/* 参与方式 */
.participate {
  background: #f8fafc;
}

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

.participate-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.participate-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.participate-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.participate-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.participate-card p {
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.qr-codes {
  display: flex;
  justify-content: center;
  gap: 2rem;
}

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

.qr-item img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  margin-bottom: 0.5rem;
}

.qr-item span {
  font-size: 0.9rem;
  color: #6b7280;
}

.benefits {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.benefit {
  color: #059669;
  font-weight: 500;
}

.contact-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: center;
}

.contact-qr {
  width: 80px;
  height: 80px;
  border-radius: 8px;
}

.contact-details p {
  margin: 0.2rem 0;
  font-size: 0.9rem;
  color: #6b7280;
}

/* 声明 */
.statement {
  background: #1f2937;
  color: white;
}

.statement-content {
  max-width: 800px;
  margin: 0 auto;
}

.statement h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
  color: #fbbf24;
}

.statement-text p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
  font-size: 1rem;
}

.statement-highlight {
  background: rgba(251, 191, 36, 0.1);
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #fbbf24;
  margin-top: 2rem;
}

.statement-highlight p {
  margin: 0;
  font-weight: 500;
  color: #fbbf24;
}

/* 联系我们 */
.contact {
  background: white;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.contact-item {
  text-align: center;
  padding: 2rem;
  background: #f8fafc;
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.contact-item:hover {
  transform: translateY(-5px);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.contact-item h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

.contact-item p {
  color: #6b7280;
  margin: 0.5rem 0;
}

/* 页脚 */
.footer {
  background: #1f2937;
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  height: 40px;
  width: auto;
}

.footer-brand p {
  color: #9ca3af;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
}

.footer-section h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #fbbf24;
}

.footer-section a {
  display: block;
  color: #9ca3af;
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-legal {
  flex: 1;
}

.footer-legal p {
  color: #9ca3af;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.footer-certificates {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: #9ca3af;
}

.separator {
  color: #6b7280;
}

.footer-copyright {
  color: #9ca3af;
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-stats {
    justify-content: center;
  }

  .circular-model {
    width: 300px;
    height: 300px;
  }

  .circle-item {
    width: 60px;
    height: 60px;
    font-size: 0.7rem;
    padding: 5px;
  }

  .circle-center {
    width: 100px;
    height: 100px;
  }

  .center-text {
    font-size: 0.9rem;
  }

  .model-flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    display: block;
    transform: rotate(90deg);
  }

  .impact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .qr-codes {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .contact-info {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  section {
    padding: 3rem 0;
  }

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

  .section-header h2 {
    font-size: 2rem;
  }

  .concept-grid,
  .advantages-grid,
  .participate-grid {
    grid-template-columns: 1fr;
  }

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

  .circular-model {
    width: 250px;
    height: 250px;
  }

  .circle-item {
    width: 50px;
    height: 50px;
    font-size: 0.6rem;
  }

  .circle-center {
    width: 80px;
    height: 80px;
  }

  .center-text {
    font-size: 0.8rem;
  }
}

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

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

/* 滚动动画 */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 选择文本样式 */
::selection {
  background: #2563eb;
  color: white;
}

::-moz-selection {
  background: #2563eb;
  color: white;
}