:root {
  /* 基础色彩系统 */
  --bg: #ffffff;
  --bg-secondary: #f9fafb;
  --card: #f8fafc;
  --card-hover: #f1f5f9;
  --text: #111827;
  --text-secondary: #374151;
  --muted: #6b7280;
  --border: #e5e7eb;
  --border-light: #f3f4f6;

  /* 主色调系统 */
  --primary: #16a34a;
  --primary-hover: #15803d;
  --primary-light: #dcfce7;
  --primary-text: #ffffff;
  
  /* 阴影系统 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.12);
  --shadow-avatar: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* 深色主题覆盖变量 */
:root[data-theme='dark'] {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --card: #1e293b;
  --card-hover: #334155;
  --text: #f1f5f9;
  --text-secondary: #e2e8f0;
  --muted: #94a3b8;
  --border: #334155;
  --border-light: #475569;

  --primary: #22c55e;
  --primary-hover: #4ade80;
  --primary-light: #166534;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.5);
  --shadow-avatar: 0 4px 20px rgba(0, 0, 0, 0.4);
}

* { 
  box-sizing: border-box; 
}

html, body { 
  margin: 0; 
  padding: 0; 
  background: var(--bg); 
  color: var(--text); 
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji', sans-serif; 
  font-weight: 400; 
  line-height: 1.5;
  transition: background 0.3s ease, color 0.3s ease;
}

.topbar { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  padding: 14px 20px; 
  border-bottom: 1px solid var(--border); 
  position: sticky; 
  top: 0; 
  background: var(--bg);
  backdrop-filter: blur(10px);
  z-index: 10;
  transition: border-color 0.3s ease;
}

.brand { 
  font-weight: 600; 
  font-size: 16px; 
  letter-spacing: -0.2px;
  transition: color 0.2s ease;
}

.brand:hover {
  color: var(--primary);
}

.nav .btn { 
  color: var(--bg); 
  background: var(--primary); 
  padding: 8px 14px; 
  border-radius: 8px; 
  text-decoration: none; 
  font-weight: 600;
  transition: all 0.2s ease;
}

.nav .btn:hover { 
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-icon { 
  display: inline-flex; 
  align-items: center; 
  gap: 8px; 
}

.btn-icon .icon { 
  font-size: 18px; 
  line-height: 1; 
}

/* 统一导航图标按钮样式 */
.nav-icon { 
  display: inline-flex; 
  align-items: center;
  justify-content: center;
  text-decoration: none; 
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 40px;
  height: 32px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-icon .icon { 
  font-size: 16px; 
  line-height: 1; 
}

.nav-icon:hover { 
  transform: translateY(-1px);
  background: var(--card-hover);
  border-color: var(--primary);
}

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

.nav select { 
  display: none; 
}

.theme-switch { 
  display: flex; 
  align-items: center; 
  gap: 8px; 
}

.theme-btn { 
  background: var(--card); 
  color: var(--text); 
  border: 1px solid var(--border); 
  border-radius: 8px; 
  width: 40px; 
  height: 32px; 
  display: inline-flex; 
  align-items: center; 
  justify-content: center; 
  cursor: pointer; 
  transition: all 0.2s ease;
}

.theme-btn .icon { 
  font-size: 16px; 
  line-height: 1; 
}

.theme-btn:hover { 
  transform: translateY(-1px);
  background: var(--card-hover);
  border-color: var(--primary);
}

.theme-btn.active { 
  background: var(--primary); 
  color: var(--primary-text); 
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.lang-switch { 
  display: flex; 
  align-items: center; 
  gap: 8px; 
}

.lang-btn { 
  background: var(--card); 
  color: var(--text); 
  border: 1px solid var(--border); 
  border-radius: 8px; 
  width: 40px; 
  height: 32px; 
  display: inline-flex; 
  align-items: center; 
  justify-content: center; 
  cursor: pointer; 
  transition: all 0.2s ease;
  font-size: 14px;
}

.lang-btn .flag { 
  font-size: 14px; 
  line-height: 1; 
}

.lang-btn:hover { 
  transform: translateY(-1px);
  background: var(--card-hover);
  border-color: var(--primary);
}

.lang-btn.active { 
  background: var(--primary); 
  color: var(--primary-text); 
  border-color: var(--primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.center { 
  max-width: 1024px; 
  margin: 48px auto; 
  padding: 0 20px; 
  display: flex; 
  flex-direction: column; 
  align-items: center; 
  gap: 28px; 
}

.profile-card { 
  display: flex; 
  flex-direction: column; 
  align-items: center; 
  gap: 14px; 
  text-align: center; 
  max-width: 480px;
  margin: 0 auto;
}

.avatar { 
  width: 112px; 
  height: 112px; 
  border-radius: 50%; 
  border: 4px solid var(--border-light); 
  background: var(--bg-secondary); 
  object-fit: cover;
  box-shadow: var(--shadow-avatar);
  transition: all 0.3s ease;
}

.avatar:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

:root[data-theme='dark'] .avatar { 
  border-color: #475569;
  background: var(--bg-secondary); 
}

.handle { 
  margin: 6px 0 0; 
  font-size: 24px; 
  font-weight: 600; 
  letter-spacing: -0.5px; 
  line-height: 1.2;
  transition: color 0.2s ease;
}

.bio { 
  margin: 8px 0 0; 
  color: var(--text-secondary); 
  font-size: 16px; 
  line-height: 1.6; 
  max-width: 560px; 
  font-weight: 400; 
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.filter-btn {
  background: var(--card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  background: var(--card-hover);
  border-color: var(--primary);
  color: var(--primary);
}

.filter-btn.active {
  background: var(--primary);
  color: var(--primary-text);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.link-list { 
  width: 100%; 
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px; 
}

@media (max-width: 768px) {
  .link-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .link-list {
    grid-template-columns: 1fr;
  }
}

.link-item { 
  display: flex; 
  flex-direction: column;
  align-items: flex-start; 
  justify-content: space-between; 
  background: var(--card); 
  border: 1px solid var(--border); 
  border-radius: 12px; 
  padding: 20px; 
  text-decoration: none; 
  color: var(--text); 
  transition: all 0.25s ease;
  position: relative;
  height: 100%;
  gap: 12px;
}

.link-item:hover { 
  background: var(--card-hover); 
  transform: translateY(-2px); 
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.link-item .left { 
  display: flex; 
  align-items: center; 
  gap: 12px; 
}

.link-item .bullet { 
  display: inline-block; 
  width: 10px; 
  height: 10px; 
  border-radius: 50%; 
  background: #7dd3fc;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.9);
  }
}

:root[data-theme='dark'] .link-item .bullet { 
  background: #60a5fa; 
}

.link-item .title { 
  font-weight: 500; 
  font-size: 16px;
  transition: color 0.2s ease;
}

.link-item:hover .title {
  color: var(--primary);
}

.link-item .right { 
  color: var(--primary); 
  font-weight: 500; 
  font-size: 14px;
  transition: all 0.2s ease;
  align-self: flex-end;
}

.link-item:hover .right {
  color: var(--primary-hover);
  transform: translateX(2px);
}

.social-row { 
  display: flex; 
  align-items: center; 
  gap: 12px; 
  margin-top: 12px; 
}

.social-btn { 
  background: var(--card); 
  color: var(--text); 
  border: 1px solid var(--border); 
  border-radius: 8px; 
  width: 38px; 
  height: 38px; 
  display: inline-flex; 
  align-items: center; 
  justify-content: center; 
  text-decoration: none;
  transition: all 0.2s ease;
}

.social-btn:hover { 
  transform: translateY(-2px) scale(1.05);
  background: var(--card-hover);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.footer { 
  text-align: center; 
  color: var(--muted); 
  padding: 32px 0; 
  border-top: 1px solid var(--border); 
  margin-top: 40px;
  font-size: 14px;
  transition: all 0.3s ease;
}