/* ==================== 友情链接页面样式（优化版） ====================
 * 设计理念：Digital Minimalism + 纸张质感
 * 优化方向：增强视觉细节、保持克制美学
 * 继承自：theme-colors.css, fonts.css, sidebar.css, home.css
 * =========================================================== */

/* ==================== 页面头部 ==================== */
.friends-page {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
}

.friends-header {
  text-align: center;
  margin-bottom: calc(var(--gap) * 3);
  padding-bottom: calc(var(--gap) * 2);
  border-bottom: 2px solid var(--border);
  animation: fadeInUp 0.8s ease-out 0.2s forwards;
  opacity: 0;
}

.friends-header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--gap);
  letter-spacing: -0.01em;
}

.friends-intro {
  font-size: 16px;
  line-height: 1.6;
  color: var(--secondary);
  max-width: 600px;
  margin: 0 auto;
}

.friends-intro a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s ease-out;
}

.friends-intro a:hover {
  text-decoration-color: var(--primary);
}

/* ==================== 友链网格布局 ==================== */
.friends-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--gap) * 1.5);
  animation: fadeInUp 0.8s ease-out 0.4s forwards;
  opacity: 0;
}

/* ==================== 友链卡片 ==================== */
.friend-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: calc(var(--gap) * 2);
  /* 优化：增加微妙的径向渐变背景，增强纸张质感 */
  background:
    radial-gradient(circle at top right, rgba(232, 227, 220, 0.3) 0%, transparent 50%),
    var(--entry);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--content);
  /* 优化：使用更自然的缓动函数 */
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  /* 优化：增强阴影层次，带有温暖色调 */
  box-shadow:
    0 1px 3px rgba(43, 37, 32, 0.04),
    0 1px 2px rgba(43, 37, 32, 0.02),
    0 0 0 1px rgba(224, 216, 207, 0.1);
  overflow: hidden;
  cursor: pointer;
  /* 优化：入场动画增加缩放和轻微旋转 */
  animation: cardFadeIn 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  opacity: 0;
}

/* 优化后的卡片渐入动画 - 增加缩放和旋转 */
@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95) rotate(-1deg);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1) rotate(0);
  }
}

/* 优化：卡片悬停效果 - 增加倾斜和光晕 */
.friend-card:hover {
  transform: translateY(-8px) rotateX(2deg);
  border-color: rgba(107, 93, 84, 0.3);
  /* 增加温暖色调的光晕效果 */
  box-shadow:
    0 16px 32px rgba(43, 37, 32, 0.12),
    0 8px 16px rgba(43, 37, 32, 0.06),
    0 0 0 1px rgba(107, 93, 84, 0.15),
    0 0 40px rgba(232, 227, 220, 0.4);
}

/* 悬停时链接图标旋转 */
.friend-card:hover .friend-link-icon svg {
  transform: rotate(45deg) scale(1.1);
}

/* 悬停时头像轻微旋转 + 缩放 */
.friend-card:hover .friend-avatar img,
.friend-card:hover .friend-avatar-fallback {
  transform: rotate(5deg) scale(1.05);
  border-color: var(--primary);
  /* 优化：增加微妙的阴影 */
  box-shadow: 0 4px 12px rgba(43, 37, 32, 0.15);
}

/* ==================== 头像样式 ==================== */
.friend-avatar {
  width: 80px;
  height: 80px;
  margin-bottom: calc(var(--gap) * 1.2);
  flex-shrink: 0;
}

.friend-avatar img,
.friend-avatar-fallback {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 3px solid var(--border);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  object-fit: cover;
}

/* 优化：首字母头像 - 更丰富的渐变和纹理 */
.friend-avatar-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  /* 优化：使用更大胆的多色渐变 */
  background:
    linear-gradient(135deg,
      rgba(232, 227, 220, 0.9) 0%,
      rgba(224, 216, 207, 0.7) 50%,
      rgba(232, 227, 220, 0.9) 100%
    ),
    /* 增加微妙的噪点纹理 */
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 2px,
      rgba(43, 37, 32, 0.02) 2px,
      rgba(43, 37, 32, 0.02) 4px
    );
  color: var(--primary);
  font-size: 32px;
  font-weight: 700;
  font-family: var(--base-font);
  text-transform: uppercase;
  /* 优化：增加文字阴影增强可读性 */
  text-shadow: 0 1px 2px rgba(255, 254, 249, 0.8);
}

/* ==================== 友链信息 ==================== */
.friend-info {
  text-align: center;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.friend-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  margin: 0 0 calc(var(--gap) * 0.5) 0;
  transition: color 0.2s ease-out;
}

.friend-card:hover .friend-name {
  color: var(--content);
}

.friend-description {
  font-size: 14px;
  line-height: 1.6;
  color: var(--secondary);
  margin: 0;
  /* 限制两行，超出显示省略号 */
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ==================== 访问图标 ==================== */
.friend-link-icon {
  position: absolute;
  top: calc(var(--gap) * 1.2);
  right: calc(var(--gap) * 1.2);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--tertiary);
  color: var(--secondary);
  opacity: 0.6;
  transition: all 0.3s ease-out;
}

.friend-card:hover .friend-link-icon {
  opacity: 1;
  background: var(--primary);
  color: var(--theme);
  /* 优化：增加微妙的阴影 */
  box-shadow: 0 2px 8px rgba(43, 37, 32, 0.2);
}

.friend-link-icon svg {
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 空状态 ==================== */
.friends-empty {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 16px;
  color: var(--secondary);
  padding: calc(var(--gap) * 4) 0;
}

/* ==================== 淡入上移动画（复用 home.css） ==================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== 响应式设计 ==================== */

/* 中屏设备 (<=1200px): 2列布局 */
@media screen and (max-width: 1200px) {
  .friends-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 小屏设备 (<=768px): 1列布局 */
@media screen and (max-width: 768px) {
  .friends-grid {
    grid-template-columns: 1fr;
    gap: var(--gap);
  }

  .friends-header {
    margin-bottom: calc(var(--gap) * 2);
    padding-bottom: var(--gap);
  }

  .friends-header h1 {
    font-size: clamp(1.5rem, 6vw, 2rem);
  }

  .friend-card {
    padding: calc(var(--gap) * 1.5);
  }

  /* 移动端禁用3D倾斜效果，避免溢出 */
  .friend-card:hover {
    transform: translateY(-6px);
  }

  .friend-avatar {
    width: 64px;
    height: 64px;
  }

  .friend-avatar-fallback {
    font-size: 28px;
  }

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

  .friend-description {
    font-size: 13px;
  }
}

/* ==================== 深色模式优化 ==================== */
:root[data-theme="dark"] .friend-card {
  /* 深色模式下使用更深的阴影 */
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(65, 66, 68, 0.3);
  /* 深色模式下的背景渐变 */
  background:
    radial-gradient(circle at top right, rgba(65, 66, 68, 0.3) 0%, transparent 50%),
    var(--entry);
}

:root[data-theme="dark"] .friend-card:hover {
  box-shadow:
    0 16px 32px rgba(0, 0, 0, 0.6),
    0 8px 16px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(155, 156, 157, 0.2),
    0 0 40px rgba(65, 66, 68, 0.4);
}

/* 深色模式下的首字母头像 */
:root[data-theme="dark"] .friend-avatar-fallback {
  background:
    linear-gradient(135deg,
      rgba(65, 66, 68, 0.9) 0%,
      rgba(51, 51, 51, 0.7) 50%,
      rgba(65, 66, 68, 0.9) 100%
    ),
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 2px,
      rgba(218, 218, 219, 0.02) 2px,
      rgba(218, 218, 219, 0.02) 4px
    );
  text-shadow: 0 1px 2px rgba(29, 30, 32, 0.8);
}

/* ==================== 减少动画模式（无障碍） ==================== */
@media (prefers-reduced-motion: reduce) {
  .friends-page,
  .friends-header,
  .friends-grid,
  .friend-card,
  .friend-avatar img,
  .friend-avatar-fallback,
  .friend-link-icon svg {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
  }

  .friend-card:hover {
    transform: none;
  }

  .friend-card:hover .friend-avatar img,
  .friend-card:hover .friend-avatar-fallback,
  .friend-card:hover .friend-link-icon svg {
    transform: none;
  }
}

/* ==================== 高对比度模式（无障碍） ==================== */
@media (prefers-contrast: high) {
  .friend-card {
    border-width: 2px;
  }

  .friend-avatar img,
  .friend-avatar-fallback {
    border-width: 4px;
  }

  .friends-header {
    border-bottom-width: 3px;
  }
}