/* AI Rules Hub — 工具站样式（保留暗色主题，简化视觉噪音） */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: #0a0a0f;
  min-height: 100vh;
}

/* 保留原有网格背景，降低对比度 */
.bg-grid {
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

.hero-glow {
  background: radial-gradient(ellipse 70% 40% at 50% -10%, rgba(99, 102, 241, 0.12), transparent);
}

/* 顶部轻量光晕（保留原有 orb 元素，减弱强度） */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

/* 搜索框 */
.search-box {
  background: rgba(18, 18, 26, 0.9);
  border: 1px solid rgba(99, 102, 241, 0.18);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-box:focus-within {
  border-color: rgba(99, 102, 241, 0.45);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

/* 规则卡片 — 干净边框，轻 hover */
.rule-card {
  background: #12121a;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  animation: fadeIn 0.4s ease forwards;
  opacity: 0;
  transform: translateY(8px);
}

.rule-card:hover {
  border-color: rgba(99, 102, 241, 0.28);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.tag {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

.btn-copy {
  background: #4f46e5;
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn-copy:hover {
  background: #6366f1;
}

.btn-copy:active {
  transform: scale(0.98);
}

.btn-copy.copied {
  background: #059669;
}

.gradient-text {
  background: linear-gradient(135deg, #fff 0%, #c7d2fe 55%, #22d3ee 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@keyframes fadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 筛选按钮 */
.filter-btn {
  background: #12121a;
  color: #9ca3af;
  border: 1px solid #1f2937;
}

.filter-btn:hover {
  border-color: rgba(99, 102, 241, 0.4);
  color: #c7d2fe;
}

.filter-btn.active {
  background: #4f46e5;
  color: #fff;
  border-color: transparent;
}

/* 分类横向滚动（手机端） */
.category-scroll {
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.category-scroll::-webkit-scrollbar {
  display: none;
}

/* AdSense 广告位占位 */
.ad-slot {
  min-height: 90px;
  border: 1px dashed rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  background: rgba(18, 18, 26, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #4b5563;
  font-size: 0.75rem;
  text-align: center;
  padding: 1rem;
}

.ad-slot--responsive {
  min-height: 100px;
}

@media (min-width: 768px) {
  .ad-slot--leaderboard {
    min-height: 90px;
  }
}

/* SEO 介绍区 */
.seo-section {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.seo-section h2 {
  color: #e5e7eb;
}

.seo-section p,
.seo-section li {
  color: #9ca3af;
  line-height: 1.7;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #0a0a0f;
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #6366f1;
}

@media (prefers-reduced-motion: reduce) {
  .rule-card {
    animation: none;
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}