/* About Page - AI驱动的登录页实验室 */

:root {
  --primary-blue: #00E5FF;
  --primary-green: #1DE9B6;
  --dark-bg: #0a0f1c;
  --darker-bg: #060b14;
  --card-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: #b0c4de;
  --text-muted: #8892b0;
  --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.15);
  --gradient-primary: linear-gradient(135deg, var(--primary-blue), var(--primary-green));
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 页面加载动画 */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--darker-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hide {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
}

.ai-brain-loader {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
}

.brain-core {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: pulse 2s ease-in-out infinite;
}

.neural-network {
  position: absolute;
  inset: 0;
}

.neuron {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--primary-blue);
  border-radius: 50%;
  animation: orbit 3s linear infinite;
}

.neuron:nth-child(1) { animation-delay: 0s; }
.neuron:nth-child(2) { animation-delay: 0.75s; }
.neuron:nth-child(3) { animation-delay: 1.5s; }
.neuron:nth-child(4) { animation-delay: 2.25s; }

.loader-text {
  color: var(--text-secondary);
  font-size: 14px;
  animation: fadeInOut 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

@keyframes orbit {
  0% { transform: rotate(0deg) translateX(35px) rotate(0deg); }
  100% { transform: rotate(360deg) translateX(35px) rotate(-360deg); }
}

@keyframes fadeInOut {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* 返回首页按钮 */
.back-home-btn {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text-primary);
  text-decoration: none;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  font-size: 14px;
  font-weight: 500;
}

.back-home-btn:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--primary-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.back-home-btn .material-icons {
  font-size: 18px;
}

/* 浮动目录导航 */
.floating-nav {
  position: fixed;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  z-index: 1000;
}

.nav-toggle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.nav-toggle:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.nav-menu {
  position: absolute;
  right: 60px;
  top: 0;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  backdrop-filter: blur(15px);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(20px);
  transition: all 0.3s ease;
}

.nav-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.nav-header {
  padding: 16px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--primary-blue);
}

.nav-links {
  list-style: none;
  padding: 8px 0;
}

.nav-links li {
  margin: 0;
}

.nav-links a {
  display: block;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 14px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-blue);
  background: rgba(0, 229, 255, 0.1);
}

/* 阅读进度条 */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-primary);
  z-index: 1001;
  transition: width 0.1s ease;
}

/* 主要内容 */
.main-content {
  padding-top: 0;
}

/* Hero 区域 */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(0, 229, 255, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(29, 233, 182, 0.1) 0%, transparent 50%);
}

.floating-shapes {
  position: absolute;
  inset: 0;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: var(--gradient-primary);
  opacity: 0.1;
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 100px;
  height: 100px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 150px;
  height: 150px;
  top: 60%;
  right: 15%;
  animation-delay: 2s;
}

.shape-3 {
  width: 80px;
  height: 80px;
  bottom: 20%;
  left: 60%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-content {
  text-align: center;
  max-width: 800px;
  padding: 0 20px;
  z-index: 1;
}

.hero-icon {
  margin-bottom: 30px;
}

.logo-img {
  width: 200px;
  /* height: 120px; */
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(11,19,37,.9), rgba(20,34,66,.9));
  padding: 15px;
  box-shadow: 0 8px 32px rgba(0, 229, 255, .18);
  animation: logoFloat 6s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(-10px) scale(1.05); }
}

.hero-title {
  margin-bottom: 20px;
}

.title-line {
  display: block;
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
  animation: titleGlow 3s ease-in-out infinite;
}

.title-subtitle {
  display: block;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 400;
  color: var(--text-secondary);
}

@keyframes titleGlow {
  0%, 100% { filter: drop-shadow(0 0 10px rgba(0, 229, 255, 0.3)); }
  50% { filter: drop-shadow(0 0 20px rgba(0, 229, 255, 0.6)); }
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

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

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 5px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* 内容区域 */
.content-section {
  padding: 80px 0;
  position: relative;
}

.content-section:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

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

.section-header {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 40px;
  justify-content: center;
}

.section-icon {
  font-size: 2rem;
  color: var(--primary-blue);
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* 项目简介 */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.intro-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.intro-visual {
  display: flex;
  justify-content: center;
}

.code-animation {
  width: 300px;
  height: 200px;
  background: var(--darker-bg);
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.code-line {
  height: 20px;
  background: var(--gradient-primary);
  border-radius: 10px;
  margin-bottom: 15px;
  opacity: 0;
  animation: codeType 4s ease-in-out infinite;
}

.code-line:nth-child(1) { width: 80%; animation-delay: 0s; }
.code-line:nth-child(2) { width: 60%; animation-delay: 0.5s; }
.code-line:nth-child(3) { width: 90%; animation-delay: 1s; }
.code-line:nth-child(4) { width: 70%; animation-delay: 1.5s; }

@keyframes codeType {
  0%, 20% { opacity: 0; width: 0; }
  40%, 80% { opacity: 1; }
  100% { opacity: 0; }
}

/* 项目亮点 */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.highlight-card {
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 30px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

.highlight-card:hover::before {
  left: 100%;
}

.highlight-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card-icon .material-icons {
  font-size: 2rem;
  color: white;
}

.highlight-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.highlight-card ul {
  list-style: none;
}

.highlight-card li {
  color: var(--text-secondary);
  margin-bottom: 8px;
  position: relative;
  padding-left: 20px;
}

.highlight-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary-blue);
  font-weight: bold;
}

/* 项目价值标签页 */
.value-tabs {
  max-width: 800px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 12px 24px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 25px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 14px;
  font-weight: 500;
  backdrop-filter: blur(10px);
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.tab-content {
  position: relative;
  min-height: 200px;
}

.tab-panel {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
}

.tab-panel.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
}

.value-item {
  text-align: center;
  padding: 30px 20px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.value-item:hover {
  transform: translateY(-5px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.value-item .material-icons {
  font-size: 3rem;
  color: var(--primary-blue);
  margin-bottom: 15px;
}

.value-item h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.value-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 技术特色 */
.tech-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: flex-start;
  margin-top: 20px;
}

.tech-visual {
  display: flex;
  justify-content: center;
}

.tech-stack {
  position: relative;
  width: 300px;
  height: 300px;
}

.tech-layer {
  position: absolute;
  width: 80px;
  height: 80px;
  background: var(--card-bg);
  border: 2px solid var(--glass-border);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  cursor: pointer;
}

.tech-layer:hover {
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.tech-layer[data-tech="html"] {
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
}

.tech-layer[data-tech="css"] {
  bottom: 20px;
  left: 20px;
}

.tech-layer[data-tech="js"] {
  bottom: 20px;
  right: 20px;
}

.tech-icon {
  font-size: 2rem;
  margin-bottom: 5px;
}

.tech-name {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.tech-features {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.feature-item:hover {
  transform: translateX(10px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.feature-item .material-icons {
  font-size: 2rem;
  color: var(--primary-blue);
  flex-shrink: 0;
}

.feature-item h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.feature-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 参与贡献 */
.contribute-intro {
  text-align: center;
  margin-bottom: 50px;
}

.contribute-intro h3 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--primary-blue);
}

.contribute-intro p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.contributor-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.contributor-card {
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 30px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  text-align: center;
}

.contributor-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.contributor-icon {
  width: 70px;
  height: 70px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.contributor-icon .material-icons {
  font-size: 2.5rem;
  color: white;
}

.contributor-card h4 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.contributor-card ul {
  list-style: none;
  margin-bottom: 25px;
}

.contributor-card li {
  color: var(--text-secondary);
  margin-bottom: 8px;
  position: relative;
  padding-left: 20px;
  text-align: left;
}

.contributor-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary-green);
  font-weight: bold;
}

.contribute-actions {
  margin-top: 20px;
}

.contribute-btn {
  display: inline-block;
  padding: 12px 24px;
  background: var(--gradient-primary);
  color: white;
  text-decoration: none;
  border-radius: 25px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.contribute-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 229, 255, 0.3);
  filter: brightness(1.1);
}

/* 诚恳说明 */
.statement-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.statement-card {
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 25px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.statement-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.statement-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--primary-blue);
}

.statement-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.transparency-note {
  text-align: center;
  padding: 30px;
  background: rgba(0, 229, 255, 0.05);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

.transparency-note p {
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.transparency-note strong {
  color: var(--primary-blue);
}

/* 如何开始 */
.start-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
}

.step-item {
  display: flex;
  gap: 20px;
  padding: 25px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.step-item:hover {
  transform: translateY(-3px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.step-number {
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.step-content p {
  color: var(--text-secondary);
  margin-bottom: 15px;
  line-height: 1.6;
}

.step-link {
  color: var(--primary-blue);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.step-link:hover {
  color: var(--primary-green);
  text-decoration: underline;
}

/* 联系我们 */
.contact-content {
  max-width: 800px;
  margin: 0 auto;
}

.contact-main {
  text-align: center;
  margin-bottom: 40px;
}

.contact-main h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.contact-main p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.6;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  text-decoration: none;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.contact-link:hover {
  transform: translateY(-3px);
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-glow);
}

.contact-link .material-icons {
  font-size: 2rem;
  color: var(--primary-blue);
  flex-shrink: 0;
}

.contact-link h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.contact-link p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

.thank-you {
  text-align: center;
  padding: 30px;
  background: var(--gradient-primary);
  border-radius: 16px;
  color: white;
}

.thank-you h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.thank-you p {
  font-size: 1.1rem;
  margin: 0;
}

/* 魔法传送门返回顶部 */
.magic-portal {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    transform: scale(0.8);
}

.magic-portal.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.magic-portal:hover {
    transform: scale(1.1);
}

.portal-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(
        from 0deg,
        #ff0080,
        #ff8c00,
        #ffd700,
        #00ff80,
        #00bfff,
        #8a2be2,
        #ff0080
    );
    animation: portalRotate 3s linear infinite;
    padding: 4px;
}

.portal-inner {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.portal-inner::before {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(
        circle,
        rgba(255, 255, 255, 0.3) 0%,
        rgba(255, 255, 255, 0.1) 30%,
        transparent 70%
    );
    animation: portalPulse 2s ease-in-out infinite;
}

.portal-core {
    font-size: 14px;
    animation: coreFloat 2s ease-in-out infinite;
    z-index: 2;
    filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.8));
}

.portal-particles {
    position: absolute;
    width: 72px;
    height: 72px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.particle {
    position: absolute;
    font-size: 8px;
    animation: particleOrbit 4s linear infinite;
    opacity: 0.8;
}

.particle:nth-child(1) {
    animation-delay: 0s;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.particle:nth-child(2) {
    animation-delay: -0.67s;
    top: 25%;
    right: 0;
    transform: translateY(-50%);
}

.particle:nth-child(3) {
    animation-delay: -1.33s;
    top: 75%;
    right: 0;
    transform: translateY(-50%);
}

.particle:nth-child(4) {
    animation-delay: -2s;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.particle:nth-child(5) {
    animation-delay: -2.67s;
    top: 75%;
    left: 0;
    transform: translateY(-50%);
}

.particle:nth-child(6) {
    animation-delay: -3.33s;
    top: 25%;
    left: 0;
    transform: translateY(-50%);
}

.portal-tooltip {
    position: absolute;
    bottom: 100%;
    right: 0;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.portal-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    right: 20px;
    border: 5px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.8);
}

.magic-portal:hover .portal-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

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

@keyframes portalPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.1;
    }
}

@keyframes coreFloat {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-3px) scale(1.1);
    }
}

@keyframes particleOrbit {
    from {
        transform: rotate(0deg) translateX(36px) rotate(0deg);
    }
    to {
        transform: rotate(360deg) translateX(36px) rotate(-360deg);
    }
}

/* 魔法爆炸效果 */
@keyframes magicExplosion {
    0% {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
    100% {
        opacity: 0;
        transform: scale(3) rotate(720deg);
    }
}

@keyframes magicParticleExplosion {
    0% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(var(--dx), var(--dy)) scale(0.3);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .floating-nav {
    top: 10px;
    right: 15px;
    transform: none;
  }
  
  .back-home-btn {
    top: 15px;
    left: 15px;
    padding: 10px 12px;
  }

  .back-text {
    display: none;
  }
  .content-section{
    padding: 40px 0;
  }
  .nav-toggle{
    width: 40px;
    height: 40px;
  }
  .material-icons{
    font-size: 20px;
  }
  .hero-stats {
    gap: 20px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .intro-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .section-header {
    flex-direction: column;
    text-align: center;
  }

  /* 修复移动端区域重叠问题 */
  .section {
    margin-bottom: 80px;
  }

  .project-value {
    margin-bottom: 100px;
  }

  .tech-features {
    margin-top: 40px;
    padding-top: 40px;
  }

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

  .nav-menu {
    right: 0;
    transform: translateX(100%);
  }

  .nav-menu.show {
    transform: translateX(0);
  }

  .tab-buttons {
    gap: 10px;
  }

  .tab-btn {
    padding: 10px 16px;
    font-size: 13px;
  }

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

  .tech-showcase {
    grid-template-columns: 1fr;
    gap: 40px;
    margin-top: 60px;
  }

  .tech-stack {
    width: 250px;
    height: 250px;
  }

  .tech-layer {
    width: 60px;
    height: 60px;
  }

  .tech-icon {
    font-size: 1.5rem;
  }

  .feature-item {
    padding: 15px;
  }

  .feature-item:hover {
    transform: translateY(-3px);
  }

  .magic-portal {
    bottom: 20px;
    right: 20px;
    width: 36px;
    height: 36px;
  }

  .portal-core {
    font-size: 11px;
  }

  .particle {
    font-size: 6px;
  }

  .portal-particles {
    width: 54px;
    height: 54px;
  }

  .portal-tooltip {
    font-size: 11px;
    padding: 6px 10px;
  }
}

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

  .section-container {
    padding: 0 15px;
  }
  #value .section-container {
    min-height: 800px;
  }
  .highlight-card {
    padding: 20px;
  }

  .code-animation {
    width: 100%;
    max-width: 280px;

  }

  .value-item {
    padding: 20px 15px;
  }

  .tech-stack {
    width: 200px;
    height: 200px;
  }

  .tech-layer {
    width: 50px;
    height: 50px;
  }

  .tech-icon {
    font-size: 1.2rem;
  }

  .tech-name {
    font-size: 0.7rem;
  }

  .contributor-types {
    grid-template-columns: 1fr;
  }

  .contributor-card {
    padding: 20px;
  }

  .statement-content {
    grid-template-columns: 1fr;
  }

  .start-steps {
    grid-template-columns: 1fr;
  }

  .step-item {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .contact-links {
    grid-template-columns: 1fr;
  }

  .contact-link {
    flex-direction: column;
    text-align: center;
  }
}