:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --dark-gradient: linear-gradient(135deg, #0c0c0c 0%, #1a1a1a 100%);
  --glass-bg: rgba(255,255,255,0.10);
  --glass-border: rgba(255,255,255,0.20);
  --text-light: rgba(255,255,255,0.90);
  --text-muted: rgba(255,255,255,0.70);
}

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

body {
  font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  background: var(--dark-gradient);
  color: var(--text-light);
  overflow-x: hidden;
  line-height: 1.6;
}

/* 动态背景粒子 */
.bg-animation {
  position: fixed; 
  top: 0; 
  left: 0; 
  width: 100vw; 
  height: 100vh; 
  z-index: -1; 
  overflow: hidden;
  pointer-events: none;
}
.particle {
  position: absolute; 
  width: 4px; 
  height: 4px;
  background: linear-gradient(45deg, #667eea, #764ba2);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
  opacity: 0.4;
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0); opacity: 0.4; }
  50% { transform: translateY(-20px) rotate(180deg); opacity: 1; }
}

/* 页眉 */
.site-header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 40px;
  background: linear-gradient(135deg, rgba(102,126,234,0.20), rgba(118,75,162,0.20));
  backdrop-filter: blur(20px);
  background-color: rgba(255,255,255,0.10);
  border-bottom: 1px solid var(--glass-border);
  min-height: 120px;
  overflow: hidden;
  color: #fff;
  font-family: "Helvetica Neue", sans-serif;
}
.site-header::before {
  content: '';
  position: absolute;
  top: -50%; 
  left: -50%; 
  width: 200%; 
  height: 200%;
  background: radial-gradient(circle, rgba(102,126,234,0.10), transparent 70%);
  animation: rotate 20s linear infinite;
  pointer-events: none;
}
@keyframes rotate {
  0% { transform: rotate(0deg);}
  100% { transform: rotate(360deg);}
}
.header-left { 
  z-index: 2; 
  display: flex; 
  align-items: center; 
  gap: 1rem;
}
.header-left .logo,
.logo {
  width: 80px; 
  height: 64px;
  border-radius: 15px;
  box-shadow: 0 15px 30px rgba(102,126,234,0.3);
  transition: all 0.3s;
  animation: logoFloat 3s ease-in-out infinite;
  background: white;
}
@keyframes logoFloat { 
  0%, 100% { transform: translateY(0px);}
  50% { transform: translateY(-8px); } 
}
.logo:hover { 
  transform: scale(1.1) translateY(-5px); 
  box-shadow: 0 25px 50px rgba(102,126,234,0.5);
}
.header-content { 
  z-index: 2; 
  flex: 1; 
  text-align: center; 
  padding: 0 40px;
}
.site-header h1 {
  font-size: 2.4rem; 
  font-weight: 700;
  background: linear-gradient(135deg, #667eea, #764ba2, #f093fb);
  background-size: 300% 300%;
  -webkit-background-clip: text; 
  -webkit-text-fill-color: transparent;
  background-clip: text; 
  color: transparent;
  animation: gradientShift 4s ease-in-out infinite;
  margin-bottom: 0.5rem; 
  text-shadow: 0 0 30px rgba(102,126,234,0.5);
}
@keyframes gradientShift { 
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; } 
}
.header-subtitle, .header-description { 
  opacity: 0; 
  animation: slideUp 1s ease-out forwards; 
}
.header-subtitle { 
  font-size: 1rem; 
  color: var(--text-muted); 
  margin-bottom: 0.3rem; 
  animation-delay: 0.5s;
}
.header-description { 
  font-size: 0.95rem; 
  color: var(--text-light); 
  animation-delay: 0.7s; 
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px);}
  to   { opacity: 1; transform: translateY(0);}
}
.header-content p strong {
  color: #fff;
}
.header-right {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}
.header-button {
  background-color: #6a5acd;
  border: none;
  padding: 8px 14px;
  color: white;
  font-size: 14px;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.3s;
}
.header-button:hover {
  background-color: #836fff;
}

/* 通知栏 */
.notice {
  padding: 2rem; 
  margin: 2rem auto; 
  max-width: 1200px;
  background: var(--glass-bg); 
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border); 
  border-radius: 20px;
  text-align: center; 
  position: relative; 
  overflow: hidden;
}
.notice::before {
  content: ''; 
  position: absolute; 
  top: 0; 
  left: -100%; 
  width: 100%; 
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.10), transparent);
  animation: shimmer 3s infinite;
  pointer-events: none;
}
@keyframes shimmer { 
  0% { left: -100%; }
  100% { left: 100%; } 
}
.notice p { 
  margin-bottom: 1rem; 
  font-size: 1.1rem; 
}
.notice strong {
  background: var(--accent-gradient);
  -webkit-background-clip: text; 
  -webkit-text-fill-color: transparent;
  background-clip: text; 
  color: transparent;
  font-weight: 700;
}

/* 项目网格 */
.projects {
  max-width: 1400px; 
  margin: 2rem auto; 
  padding: 0 2rem;
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(350px,1fr)); 
  gap: 2rem;
}
.project-item {
  background: var(--glass-bg); 
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border); 
  border-radius: 24px;
  padding: 2rem; 
  transition: all 0.4s cubic-bezier(.175,.885,.32,1.275);
  position: relative; 
  overflow: hidden; 
  cursor: pointer;
}
.project-item::before {
  content: ''; 
  position: absolute; 
  inset: 0;
  background: linear-gradient(135deg, rgba(102,126,234,0.1), rgba(118,75,162,0.1));
  opacity: 0; 
  transition: opacity 0.3s;
}
.project-item:hover::before { opacity: 1; }
.project-item:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 30px 60px rgba(102,126,234,0.3);
  border-color: rgba(102,126,234,0.5);
}
.project-item:nth-child(odd):hover {
  box-shadow: 0 30px 60px rgba(240,147,251,0.3);
}
.project-title {
  display: block; 
  font-size: 1.2rem; 
  font-weight: 600;
  color: var(--text-light); 
  text-decoration: none;
  margin-bottom: 1rem; 
  position: relative; 
  z-index: 2;
  transition: all 0.3s;
  outline: none;
}
.project-title:hover, .project-title:focus {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
  outline: 2px solid #667eea;
  outline-offset: 2px;
}
.project-subtitle {
  color: var(--text-muted); 
  font-size: 0.95rem; 
  line-height: 1.6; 
  position: relative; 
  z-index: 2;
}
/* 数字标签 */
.project-item::after {
  content: attr(data-number);
  position: absolute; 
  top: 1rem; 
  right: 1rem;
  min-width: 40px; 
  height: 40px;
  padding: 0 8px;
  background: var(--accent-gradient); 
  border-radius: 50%;
  display: flex; 
  align-items: center; 
  justify-content: center;
  font-weight: 700; 
  font-size: 0.9rem; 
  color: white;
  opacity: 0.8; 
  transition: all 0.3s;
  white-space: nowrap;
}
.project-item:hover::after { 
  opacity: 1; 
  transform: scale(1.1);
}

/* 页脚 */
footer {
  margin-top: 6rem; 
  padding: 4rem 2rem; 
  text-align: center;
  background: linear-gradient(135deg, rgba(12,12,12,0.9), rgba(26,26,26,0.9));
  backdrop-filter: blur(20px); 
  border-top: 1px solid var(--glass-border);
  position: relative;
}
.invest-button {
  display: inline-block; 
  padding: 1rem 2.5rem;
  background: var(--secondary-gradient); 
  color: white;
  text-decoration: none; 
  border-radius: 50px; 
  font-weight: 600;
  margin: 1.5rem 0; 
  transition: all 0.3s;
  box-shadow: 0 10px 30px rgba(240,147,251,0.3);
  position: relative; 
  overflow: hidden;
  border: none;
}
.invest-button::before {
  content: ''; 
  position: absolute; 
  top: 0; 
  left: -100%; 
  width: 100%; 
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}
.invest-button:hover::before { left: 100%; }
.invest-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 40px rgba(240,147,251,0.5);
}
footer p { 
  margin: 1rem 0; 
  color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 768px) {
  .site-header { 
    padding: 1.5rem 1rem; 
    flex-direction: column; 
    gap: 1rem;
  }
  .header-left { align-self: flex-start; }
  .header-content { text-align: center; padding: 10px 0; }
  .site-header h1 { font-size: 1.4rem; }
  .projects { grid-template-columns: 1fr; padding: 0 1rem; gap: 1.5rem; margin: 2rem auto;}
  .project-item { padding: 1rem;}
  .notice { font-size: 0.95rem; padding: 1rem; }
}

@media (max-width: 768px) {
  .notice-columns {
    flex-direction: column;
    gap: 1.5rem;
  }
  .notice-col {
    max-width: none;
    width: 100%;
    padding: 1rem;
  }
}

/* 滚动条 */
::-webkit-scrollbar { width: 8px;}
::-webkit-scrollbar-track { background: rgba(255,255,255,0.1);}
::-webkit-scrollbar-thumb { background: var(--primary-gradient); border-radius: 4px;}
::-webkit-scrollbar-thumb:hover { background: var(--secondary-gradient);}