/* ==========================================================================
   趣味数学游戏集 - 现代化主页样式表 (css/index.css)
   支持 5 大分类、实时检索、卡片微标签、底栏对齐与多端自适应
   ========================================================================== */

:root {
  --primary: #0d9488;
  --primary-hover: #0f766e;
  --primary-light: #ccfbf1;
  --accent: #f43f5e;
  --accent-hover: #e11d48;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07);
  --shadow-hover: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
  --radius-card: 14px;
  --radius-btn: 8px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  background-color: var(--bg-page);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

/* 顶部 Hero 区域 */
.hero-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0d9488 100%);
  color: #ffffff;
  padding: 3rem 1.5rem 2.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 0.6rem;
}

.hero-header p {
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 1.4rem;
}

.hero-stats {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.stat-chip {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 5px 14px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
}

/* 主容器 */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* 吸顶控制条（搜索与分类筛选） */
.sticky-control-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 252, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  margin-bottom: 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.search-box-wrapper {
  position: relative;
  max-width: 580px;
  margin: 0 auto 0.9rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 2.75rem 0.75rem 2.75rem;
  font-size: 0.96rem;
  border: 1.5px solid var(--border-color);
  border-radius: 9999px;
  background: #ffffff;
  outline: none;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.18);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.btn-clear-search {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  background: #e2e8f0;
  border: none;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: #475569;
  cursor: pointer;
  visibility: hidden;
}

.btn-clear-search.visible {
  visibility: visible;
}

/* 分类胶囊选项卡 */
.category-pills {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.pill-btn {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: #475569;
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
  box-shadow: var(--shadow-sm);
}

.pill-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pill-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 3px 10px rgba(13, 148, 136, 0.28);
}

.pill-count {
  display: inline-block;
  background: rgba(0, 0, 0, 0.08);
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 0.76rem;
  margin-left: 4px;
}

.pill-btn.active .pill-count {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

/* 分类分区标题 */
.category-section {
  margin-bottom: 3rem;
  scroll-margin-top: 140px;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.6rem;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 卡片网格 */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.5rem;
}

/* 单个卡片 */
.game-card {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-color);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  position: relative;
}

.game-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: #cbd5e1;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 0.75rem;
}

.game-card h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: #0f172a;
  line-height: 1.35;
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 6px;
  white-space: nowrap;
}

.badge-olympiad { background: #fee2e2; color: #b91c1c; }
.badge-ai { background: #dbeafe; color: #1d4ed8; }
.badge-touch { background: #dcfce7; color: #15803d; }
.badge-math { background: #fef3c7; color: #b45309; }
.badge-lang { background: #f3e8ff; color: #7e22ce; }
.badge-life { background: #e0e7ff; color: #4338ca; }

.game-card p {
  font-size: 0.91rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* 卡片底栏操作按钮组 */
.card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: auto;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-btn);
  transition: all 0.18s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 2px 6px rgba(13, 148, 136, 0.3);
}

.btn-secondary {
  background-color: #f1f5f9;
  color: #334155;
  border: 1px solid #cbd5e1;
}

.btn-secondary:hover {
  background-color: #e2e8f0;
  color: #0f172a;
}

.btn-coral {
  background-color: #ff6b6b;
  color: #ffffff;
}

.btn-coral:hover {
  background-color: #ee5252;
}

.btn-indigo {
  background-color: #4f46e5;
  color: #ffffff;
}

.btn-indigo:hover {
  background-color: #4338ca;
}

.btn-amber {
  background-color: #d97706;
  color: #ffffff;
}

.btn-amber:hover {
  background-color: #b45309;
}

/* 空状态提示 */
.empty-state {
  display: none;
  text-align: center;
  padding: 4rem 1.5rem;
  color: var(--text-muted);
}

.empty-state.visible {
  display: block;
}

.empty-state h3 {
  font-size: 1.3rem;
  color: #334155;
  margin-bottom: 0.5rem;
}

/* 页脚 */
footer {
  background-color: #0f172a;
  color: #94a3b8;
  text-align: center;
  padding: 2.5rem 1rem;
  margin-top: 4rem;
  font-size: 0.9rem;
}

footer p {
  max-width: 600px;
  margin: 0 auto;
}

footer a {
  color: #38bdf8;
  text-decoration: none;
}

/* 响应式断点 */
@media (max-width: 768px) {
  .hero-header { padding: 2rem 1rem 1.5rem; }
  .sticky-control-bar { padding: 0.75rem 0; margin-bottom: 1.5rem; }
  .category-pills { overflow-x: auto; justify-content: flex-start; padding-bottom: 4px; }
  .pill-btn { white-space: nowrap; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 4px; }
  .games-grid { grid-template-columns: 1fr; gap: 1rem; }
}

@media (min-width: 1920px) {
  .container { max-width: 1680px; }
  .games-grid { grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 2rem; }
  .game-card h3 { font-size: 1.3rem; }
  .game-card p { font-size: 1rem; }
}