/* aiknow.org.cn — AIHOT Dark Theme Navigation */

.site-nav {
  display: flex;
  align-items: center;
  padding: 10px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  position: sticky;
  top: 0;
  background: rgba(10,10,15,0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  z-index: 100;
  gap: 8px;
}

.site-nav-toggle {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.site-nav-toggle-btn {
  display: none;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  color: #a0a0b8;
  cursor: pointer;
  flex-shrink: 0;
  user-select: none;
}

.site-nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #e4e4ec;
  flex-shrink: 0;
}
.site-nav-logo img {
  width: 28px; height: 28px;
  border-radius: 5px;
}
.site-nav-logo span {
  font-weight: 700;
  font-size: 1.05rem;
  color: #e4e4ec;
  white-space: nowrap;
}

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 auto;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.site-nav-links::-webkit-scrollbar { display: none; }

.site-nav-links a {
  padding: 5px 12px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #666680;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.15s;
}
.site-nav-links a:hover {
  color: #a0a0b8;
  background: rgba(255,255,255,0.04);
}
.site-nav-links a.active {
  color: #8aa4ff;
  background: rgba(108,140,255,0.10);
  font-weight: 600;
}

.site-nav-ctas, .site-nav-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.site-nav-cta {
  padding: 5px 12px;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.15s;
  color: #fff;
}
.site-nav-cta.write {
  background: linear-gradient(135deg, #a78bfa, #8b5cf6);
}
.site-nav-cta.search {
  background: linear-gradient(135deg, #6c8cff, #4f6ef6);
}
.site-nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108,140,255,0.3);
}

.site-nav-theme {
  width: 28px; height: 28px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.1);
  background: transparent;
  color: #666680;
  cursor: pointer;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
  padding: 0;
  transition: all 0.15s;
}
.site-nav-theme:hover {
  background: rgba(255,255,255,0.06);
  color: #a0a0b8;
}

/* Light theme nav */
[data-theme="light"] .site-nav {
  background: rgba(255,255,255,0.85);
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
[data-theme="light"] .site-nav-logo { color: #1a1a2e; }
[data-theme="light"] .site-nav-logo span { color: #1a1a2e; }
[data-theme="light"] .site-nav-links a { color: #7a7a9a; }
[data-theme="light"] .site-nav-links a:hover { color: #4a4a6a; background: rgba(0,0,0,0.04); }
[data-theme="light"] .site-nav-links a.active { color: #2563eb; background: rgba(37,99,235,0.08); }
[data-theme="light"] .site-nav-toggle-btn { border-color: rgba(0,0,0,0.1); color: #4a4a6a; }
[data-theme="light"] .site-nav-theme { border-color: rgba(0,0,0,0.1); color: #7a7a9a; }
[data-theme="light"] .site-nav-theme:hover { background: rgba(0,0,0,0.04); color: #4a4a6a; }

@media (max-width: 768px) {
  .site-nav { padding: 8px 14px; gap: 6px; flex-wrap: nowrap; }
  .site-nav-logo img { width: 24px; height: 24px; }
  .site-nav-logo span { font-size: 0.95rem; }
  .site-nav-toggle-btn { display: flex; order: 2; }
  .site-nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 8px;
    right: 8px;
    margin: 6px 0 0;
    padding: 10px;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 12px;
    background: rgba(10,10,15,0.96);
    box-shadow: 0 14px 36px rgba(0,0,0,0.24);
    grid-template-columns: repeat(3,minmax(0,1fr));
    gap: 6px;
    overflow: visible;
  }
  .site-nav-toggle:checked ~ .site-nav-links { display: grid; }
  .site-nav-links a {
    min-width: 0;
    text-align: center;
    font-size: 0.8125rem;
    padding: 8px 6px;
    white-space: normal;
    line-height: 1.25;
  }
  .site-nav-actions, .site-nav-ctas { order: 3; margin-left: auto; }
  .site-nav-cta { font-size: 0.75rem; padding: 4px 8px; }
  [data-theme="light"] .site-nav-links {
    background: rgba(255,255,255,0.98);
    border-color: rgba(0,0,0,0.08);
    box-shadow: 0 14px 36px rgba(15,23,42,0.14);
  }
}

@media (max-width: 480px) {
  .site-nav { padding: 8px 10px; gap: 5px; }
  .site-nav-logo span { display: inline; font-size: 0.88rem; }
  .site-nav-links {
    left: 6px;
    right: 6px;
    grid-template-columns: repeat(2,minmax(0,1fr));
    padding: 8px;
  }
  .site-nav-links a { font-size: 0.78rem; padding: 8px 6px; }
  .site-nav-ctas, .site-nav-actions { gap: 4px; }
  .site-nav-cta { font-size: 0.72rem; padding: 5px 7px; }
  .site-nav-theme { width: 30px; height: 30px; }
}

@media (max-width: 360px) {
  .site-nav-logo span { display: none; }
  .site-nav-cta { font-size: 0.68rem; padding: 5px 6px; }
}

/* OPC 选择器下拉菜单 */
.site-nav-dropdown{position:relative;display:inline-block}
.opc-trigger{cursor:pointer}
.site-nav-dropdown .opc-menu{display:none;position:absolute;top:100%;right:0;margin-top:6px;background:var(--bg2,#11161e);border:1px solid var(--border,#1f2937);border-radius:8px;padding:6px;min-width:160px;box-shadow:0 8px 24px rgba(0,0,0,.5);z-index:200}
.site-nav-dropdown:hover .opc-menu{display:block}
.opc-menu a{display:block;padding:8px 12px;font-size:13px;color:var(--text,#e5e7eb);border-radius:4px;white-space:nowrap}
.opc-menu a:hover{background:var(--bg3,#1a212b);text-decoration:none}
.opc-menu a.active{background:var(--accent,#3b82f6);color:#fff}