/* ===== Social Services Library - 极简排版 + 无白线版 ===== */
: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, 0.85); 
  --glass-bg: rgba(255, 255, 255, 0.2); 
  --glass-border: transparent; /* 去除白线的核心 */
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.08); 
  --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.12);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1); 
  --gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
}

[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, 0.85); 
  --glass-bg: rgba(30, 41, 59, 0.2); 
  --glass-border: transparent; /* 去除白线的核心 */
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.2); 
  --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.3);
  --gradient: linear-gradient(135deg, #818cf8, #a78bfa);
}

* { 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: background-color 0.3s ease, color 0.3s ease; -webkit-font-smoothing: antialiased;
}

body::before {
  content: ''; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: radial-gradient(at 80% 20%, rgba(99, 102, 241, 0.08) 0px, transparent 50%), radial-gradient(at 20% 80%, rgba(139, 92, 246, 0.05) 0px, transparent 50%);
  background-attachment: fixed;
}

.social-card, .logo-icon, .theme-toggle { transform: translateZ(0); backface-visibility: hidden; }

/* ===============================
   彻底移除输入框和按钮的边框白线
   =============================== */
input, .dropdown-btn, .theme-toggle, .dropdown-content, .social-card, .social-tag, .page-number { 
    border: none !important; outline: none !important; 
}

/* 交互效果 */
input:focus { box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2), var(--shadow) !important; transform: translateY(-1px); }
.dropdown-btn:hover, .theme-toggle:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover) !important; background: var(--card-bg) !important; }

/* 下拉菜单 */
.dropdown-content { position: absolute; top: 100%; right: 0; background: var(--card-bg); backdrop-filter: blur(8px); border-radius: 18px; box-shadow: var(--shadow); padding: 18px; min-width: 350px; max-height: 500px; overflow-y: auto; z-index: 1000; display: none; flex-direction: column; gap: 14px; margin-top: 12px; }
.dropdown-content.show { display: flex; animation: fadeInUp 0.25s 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 rgba(150, 150, 150, 0.1); 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, 0.08); transform: translateX(3px); }
.filter-option.active { background: var(--gradient); color: white; box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2); }

/* 活动标签 */
.active-filter { background: var(--gradient); color: white; padding: 8px 16px; border-radius: 20px; font-size: 13px; display: inline-flex; align-items: center; gap: 8px; font-weight: 500; box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2); transition: var(--transition); }
.active-filter:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(99, 102, 241, 0.25); }

/* ===============================
   网格：强制 1 行 4 个卡片排版
   =============================== */
.social-grid { display: grid; grid-template-columns: repeat(4, 1fr) !important; gap: 22px; margin-bottom: 30px; }

/* 卡片内部 */
.social-card { background: var(--card-bg); backdrop-filter: blur(4px); border-radius: 16px; padding: 20px; box-shadow: var(--shadow); transition: var(--transition); display: flex; flex-direction: column; position: relative; overflow: hidden; min-height: 190px; }
.social-card.hidden { display: none !important; }
.social-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient); opacity: 0; transition: opacity 0.25s ease; }
.social-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.social-card:hover::before { opacity: 1; }

.social-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 24px; color: white; margin-bottom: 16px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12); }
.social-name { font-family: 'Poppins', sans-serif; font-weight: 600; font-size: 17px; margin-bottom: 10px; color: var(--text-color); line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.social-desc, .social-handle { font-size: 14px; color: var(--text-secondary); line-height: 1.4; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex-grow: 1; min-height: 40px; }
.social-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.social-tag { background: rgba(99, 102, 241, 0.08); color: var(--primary-color); padding: 4px 10px; border-radius: 16px; font-size: 11px; font-weight: 500; transition: var(--transition); }
.social-tag:hover { background: rgba(99, 102, 241, 0.15); }
.social-link { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-color); text-decoration: none; font-weight: 600; font-size: 14px; transition: var(--transition); margin-top: auto; align-self: flex-start; }
.social-link:hover { gap: 10px; color: var(--secondary-color); }

/* 分页控件 */
.pagination-controls { display: flex; justify-content: center; align-items: center; gap: 15px; margin: 40px 0; padding: 20px; flex-wrap: wrap; }
.pagination-btn { background: var(--gradient); color: white; padding: 12px 24px; border-radius: 12px; font-size: 15px; font-weight: 600; cursor: pointer; transition: var(--transition); box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2); display: flex; align-items: center; gap: 8px; min-width: 120px; justify-content: center; }
.pagination-btn:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(99, 102, 241, 0.3); }
.pagination-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination-info { color: var(--text-secondary); font-size: 14px; text-align: center; min-width: 200px; }
.pagination-numbers { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: center; }
.page-number { background: var(--glass-bg); width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 14px; cursor: pointer; transition: var(--transition); color: var(--text-color); font-weight: 500; }
.page-number:hover { background: var(--card-bg); transform: translateY(-2px); }
.page-number.active { background: var(--gradient); color: white; box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2); }
.page-number.ellipsis { cursor: default; background: transparent; width: 20px; }

/* 状态 */
.loading-indicator { text-align: center; padding: 40px; color: var(--text-secondary); font-size: 16px; grid-column: 1 / -1; }
.loading-indicator i { font-size: 32px; margin-bottom: 15px; color: var(--primary-color); animation: spin 1.5s linear infinite; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-secondary); font-size: 16px; grid-column: 1 / -1; }
.empty-state i { font-size: 48px; margin-bottom: 15px; color: var(--primary-color); opacity: 0.5; }
.empty-state .small { font-size: 14px; margin-top: 8px; opacity: 0.7; }

/* 返回顶部按钮 */
.back-to-top { position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px; background: var(--primary-color); color: white; border-radius: 50%; display: flex; justify-content: center; align-items: center; text-decoration: none; box-shadow: var(--shadow); transition: var(--transition); opacity: 0; visibility: hidden; z-index: 999; }
.back-to-top.active { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--secondary-color); transform: translateY(-5px); color: white; }

/* 动画和滚动条 */
.dropdown-content::-webkit-scrollbar { width: 5px; }
.dropdown-content::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.08); border-radius: 3px; }
.dropdown-content::-webkit-scrollbar-thumb { background: var(--primary-color); border-radius: 3px; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* 手机端降级显示，保证可读性 */
@media (max-width: 1200px) { .social-grid { grid-template-columns: repeat(3, 1fr) !important; } }
@media (max-width: 992px) { .social-grid { grid-template-columns: repeat(2, 1fr) !important; } }
@media (max-width: 600px) { .social-grid { grid-template-columns: 1fr !important; } .dropdown-content { right: 0; left: 0; min-width: 100%; } }

/* ========================================================
   版权 Footer (完全为你原本的 100% 原版代码，绝无半点改动)
   ======================================================== */
footer {
  text-align: center;
  padding: 35px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05); /* 极弱的分界线 */
  font-size: 15px;
  color: var(--text-secondary);
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

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;
}

/* 确保页脚内容完全居中 */
footer p {
  margin: 0;
  text-align: center;
  width: 100%;
}