/* ===== CSS变量和基础样式 ===== */
:root {
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --accent-color: #06b6d4;
  --text-color: #1f2937;
  --text-secondary: #6b7280;
  --bg-color: #f8fafc;
  --card-bg: rgba(255, 255, 255, 0.9);
  --glass-bg: rgba(255, 255, 255, 0.25);
  --glass-border: rgba(255, 255, 255, 0.18);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #06b6d4);
}

[data-theme='dark'] {
  --primary-color: #818cf8;
  --secondary-color: #a78bfa;
  --accent-color: #22d3ee;
  --text-color: #f1f5f9;
  --text-secondary: #cbd5e1;
  --bg-color: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.8);
  --glass-bg: rgba(15, 23, 42, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
  --gradient: linear-gradient(135deg, #818cf8, #a78bfa, #22d3ee);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: var(--transition);
  background-image:
    radial-gradient(at 80% 20%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 20% 80%, rgba(139, 92, 246, 0.1) 0px, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 性能优化 ===== */
.social-grid {
  content-visibility: auto;
  contain-intrinsic-size: 500px;
}

.social-card {
  content-visibility: auto;
  contain-intrinsic-size: 300px;
}

/* ===== 头部样式 ===== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 40px 0 30px;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 20px;
  position: relative;
}

.logo::before {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  background: var(--gradient);
  border-radius: 20px;
  opacity: 0.1;
  z-index: -1;
}

.logo-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 28px;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
  position: relative;
  overflow: hidden;
}

.logo-icon::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transform: rotate(45deg);
  animation: shine 3s infinite;
}

.logo-text h1 {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 32px;
  margin-bottom: 8px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text p {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 400;
}

/* ===== 搜索和筛选区域 ===== */
.search-filter-section {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
  align-items: center;
  justify-content: space-between;
}

.search-box {
  position: relative;
  flex-grow: 1;
  max-width: 600px;
}

.search-box input {
  width: 100%;
  padding: 18px 25px 18px 60px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  font-size: 16px;
  box-shadow: var(--shadow);
  color: var(--text-color);
  transition: var(--transition);
  font-weight: 400;
}

.search-box input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3), var(--shadow);
  border-color: var(--primary-color);
}

.search-box i {
  position: absolute;
  left: 25px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary-color);
  font-size: 18px;
  z-index: 1;
}

.filter-section {
  position: relative;
}

.dropdown-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  padding: 18px 25px;
  border-radius: 16px;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  color: var(--text-color);
  white-space: nowrap;
  font-weight: 500;
}

.dropdown-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  background: var(--card-bg);
}

.dropdown-content {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 20px;
  min-width: 350px;
  max-height: 500px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
  flex-direction: column;
  gap: 15px;
  margin-top: 15px;
}

.dropdown-content.show {
  display: flex;
  animation: fadeInUp 0.3s ease;
}

.dropdown-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dropdown-group h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--primary-color);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--glass-border);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-color);
  font-weight: 400;
}

.filter-option:hover {
  background: rgba(99, 102, 241, 0.1);
  transform: translateX(5px);
}

.filter-option.active {
  background: var(--gradient);
  color: white;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.theme-toggle {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  width: 55px;
  height: 55px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow);
  color: var(--text-color);
  font-size: 20px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.theme-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-hover);
}

/* ===== 活动筛选器 ===== */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.active-filter {
  background: var(--gradient);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
  transition: var(--transition);
}

.active-filter:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* ===== 社交网格布局 ===== */
.social-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.social-card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.6s ease forwards;
}

.social-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}

.social-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.social-card:hover::before {
  opacity: 1;
}

.social-icon {
  width: 70px;
  height: 70px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: white;
  margin-bottom: 25px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  position: relative;
  overflow: hidden;
}

.social-name {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--text-color);
  line-height: 1.3;
  word-break: break-word;
  overflow-wrap: break-word;
}

.social-desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 25px;
  flex-grow: 1;
  line-height: 1.7;
  word-break: break-word;
  overflow-wrap: break-word;
}

.social-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.social-tag {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary-color);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid rgba(99, 102, 241, 0.2);
  transition: var(--transition);
}

.social-tag:hover {
  background: rgba(99, 102, 241, 0.2);
  transform: translateY(-1px);
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition);
  padding: 8px 0;
  position: relative;
}

.social-link:hover {
  gap: 15px;
  color: var(--secondary-color);
}

/* ===== 页脚 ===== */
footer {
  text-align: center;
  padding: 40px 0;
  border-top: 1px solid var(--glass-border);
  font-size: 15px;
  color: var(--text-secondary);
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 2px;
  background: var(--gradient);
}

footer b {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 动画定义 ===== */
@keyframes shine {
  0% {
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
  }

  100% {
    transform: translateX(100%) translateY(100%) rotate(45deg);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 滚动条样式 ===== */
.dropdown-content::-webkit-scrollbar {
  width: 6px;
}

.dropdown-content::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 3px;
}

.dropdown-content::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 3px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .social-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
  }
}

@media (max-width: 768px) {
  .social-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 25px;
    padding: 30px 0 20px;
  }

  .search-filter-section {
    display: grid;
    grid-template-columns: 1fr auto auto;
    grid-template-rows: auto;
    gap: 12px;
    align-items: center;
    width: 100%;
  }

  .search-box {
    grid-column: 1 / 4;
    grid-row: 1;
    max-width: 100%;
    order: 1;
  }

  .filter-section {
    grid-column: 1;
    grid-row: 2;
    order: 2;
    width: 100%;
  }

  .theme-toggle {
    grid-column: 3;
    grid-row: 2;
    order: 3;
    width: 50px;
    height: 50px;
    font-size: 18px;
  }

  .dropdown-btn {
    width: 100%;
    justify-content: space-between;
  }

  .dropdown-content {
    right: auto;
    left: 0;
    min-width: 100%;
  }

  .social-card {
    padding: 24px;
    min-height: 260px;
  }

  .social-name {
    font-size: 20px;
  }

  .social-desc {
    font-size: 14px;
  }

  .social-icon {
    width: 60px;
    height: 60px;
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .social-grid {
    grid-template-columns: 1fr;
  }

  .search-filter-section {
    grid-template-columns: 1fr auto;
    gap: 10px;
  }

  .search-box {
    grid-column: 1 / 3;
  }

  .filter-section {
    grid-column: 1;
    grid-row: 2;
  }

  .theme-toggle {
    grid-column: 2;
    grid-row: 2;
    width: 45px;
    height: 45px;
    font-size: 16px;
  }

  .dropdown-btn {
    padding: 12px 16px;
    font-size: 14px;
  }

  .search-box input {
    padding: 14px 18px 14px 45px;
    font-size: 14px;
  }

  .search-box i {
    left: 18px;
    font-size: 15px;
  }

  .social-card {
    padding: 20px;
    min-height: 240px;
  }

  .social-name {
    font-size: 18px;
  }

  .social-desc {
    font-size: 13px;
  }
}

/* ===== 延迟动画 ===== */
.social-card:nth-child(odd) {
  animation-delay: 0.1s;
}

.social-card:nth-child(even) {
  animation-delay: 0.2s;
}