/* 阅读进度条 */
.reading-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--color-accent); z-index: 1000; transition: width 0.1s linear;
}

/* 头部 */
.site-header {
  position: sticky; top: 0; z-index: 900;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--transition);
}
[data-theme="dark"] .site-header { background: rgba(15,15,15,0.85); }
.site-header--hidden { transform: translateY(-100%); }

.site-header__inner {
  max-width: 1100px; margin: 0 auto; height: var(--header-height);
  padding: 0 var(--space-6);
  display: flex; align-items: center; justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: var(--space-2); font-weight: 600; color: var(--color-text); }
.brand:hover { color: var(--color-text); }
.brand__mark { font-size: 1.25rem; }
.brand__name { font-size: 1.05rem; letter-spacing: -0.01em; }

.site-nav { display: flex; gap: var(--space-8); }
.site-nav__link {
  position: relative; font-size: var(--text-sm); font-weight: 500;
  color: var(--color-text-soft); padding: var(--space-2) 0;
}
.site-nav__link::after {
  content: ''; position: absolute; left: 0; bottom: -2px; width: 100%; height: 2px;
  background: var(--color-accent); transform: scaleX(0); transform-origin: left; transition: transform var(--transition);
}
.site-nav__link:hover, .site-nav__link.active { color: var(--color-text); }
.site-nav__link:hover::after, .site-nav__link.active::after { transform: scaleX(1); }

.site-header__actions { display: flex; align-items: center; gap: var(--space-1); }
.icon-btn {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full); color: var(--color-text-soft); transition: background var(--transition), color var(--transition);
}
.icon-btn:hover { background: var(--color-surface-hover); color: var(--color-text); }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* 搜索弹窗 */
.search-modal {
  position: fixed; inset: 0; z-index: 1100; display: flex; justify-content: center;
  align-items: flex-start; padding-top: 14vh; opacity: 0; visibility: hidden; transition: all var(--transition);
}
.search-modal.active { opacity: 1; visibility: visible; }
.search-modal__overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.4); backdrop-filter: blur(2px); }
.search-modal__panel {
  position: relative; width: 100%; max-width: 560px; margin: 0 var(--space-4);
  background: var(--color-surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); overflow: hidden; transform: translateY(-12px); transition: transform var(--transition);
}
.search-modal.active .search-modal__panel { transform: translateY(0); }
.search-modal__bar { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-4) var(--space-5); border-bottom: 1px solid var(--color-border); color: var(--color-text-faint); }
.search-modal__input { flex: 1; border: none; background: none; font-size: var(--text-lg); color: var(--color-text); outline: none; }
.search-modal__input::placeholder { color: var(--color-text-faint); }
.search-modal__kbd { font-family: var(--font-mono); font-size: var(--text-xs); padding: 2px 6px; background: var(--color-bg-subtle); border-radius: var(--radius-sm); color: var(--color-text-faint); }
.search-modal__results { max-height: 420px; overflow-y: auto; padding: var(--space-3); }
.search-modal__hint { text-align: center; color: var(--color-text-faint); padding: var(--space-10) 0; }
.search-result { padding: var(--space-4); border-radius: var(--radius); cursor: pointer; transition: background var(--transition); }
.search-result:hover { background: var(--color-surface-hover); }
.search-result__title { font-weight: 600; margin-bottom: 2px; }
.search-result__excerpt { font-size: var(--text-sm); color: var(--color-text-soft); line-height: 1.5; }
.search-result__date { font-size: var(--text-xs); color: var(--color-text-faint); margin-top: var(--space-1); }

/* 通用按钮 */
.btn-ghost {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5); border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full); font-size: var(--text-sm); font-weight: 500;
  color: var(--color-text-soft); transition: all var(--transition);
}
.btn-ghost:hover { background: var(--color-surface-hover); color: var(--color-text); border-color: var(--color-text-faint); }

/* 标签 */
.tag {
  display: inline-flex; align-items: center; padding: 3px var(--space-3);
  background: var(--color-bg-subtle); color: var(--color-text-soft);
  font-size: var(--text-xs); font-weight: 500; border-radius: var(--radius-full);
  transition: all var(--transition); cursor: pointer;
}
.tag:hover { background: var(--color-accent); color: #fff; }

/* 骨架屏 */
.skeleton-feed { padding: var(--space-8) 0; }
.skeleton-line { height: 16px; background: linear-gradient(90deg, var(--color-bg-subtle) 25%, var(--color-surface-hover) 50%, var(--color-bg-subtle) 75%); background-size: 200% 100%; animation: sk 1.4s infinite; border-radius: var(--radius-sm); margin-bottom: var(--space-3); }
.skeleton-line--title { height: 32px; width: 60%; margin-bottom: var(--space-5); }
.skeleton-line--short { width: 40%; }
@keyframes sk { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

.loading { display: flex; align-items: center; justify-content: center; padding: var(--space-12); color: var(--color-text-faint); }
.loading::after { content: ''; width: 20px; height: 20px; margin-left: var(--space-2); border: 2px solid var(--color-border); border-top-color: var(--color-accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state { text-align: center; padding: var(--space-16) var(--space-6); color: var(--color-text-soft); }

.error-state { text-align: center; padding: var(--space-8); background: rgba(229,57,53,0.08); border: 1px solid rgba(229,57,53,0.2); border-radius: var(--radius-lg); color: #c62828; }

.widget__loading { color: var(--color-text-faint); font-size: var(--text-sm); }

/* 回到顶部 */
.back-to-top {
  position: fixed; right: var(--space-6); bottom: var(--space-6); z-index: 800;
  width: 44px; height: 44px; border-radius: var(--radius-full);
  background: var(--color-surface); border: 1px solid var(--color-border);
  box-shadow: var(--shadow); color: var(--color-text-soft);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: all var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { color: var(--color-accent); border-color: var(--color-accent); }

/* 写文章按钮 */
.upload-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: #242424;
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s;
}
[data-theme="dark"] .upload-btn {
  background: #ededed;
  color: #242424;
}
.upload-btn:hover {
  opacity: 0.85;
}