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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--color-slate);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-main);
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* 布局辅助 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.container-reading {
  max-width: var(--container-reading);
}

/* 按钮风格 Kitty POP! */
.pop-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  border-radius: var(--radius-full);
  padding: 12px 24px;
  cursor: pointer;
  border: 2px solid var(--color-slate);
  transition: transform 0.15s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.15s ease, background-color 0.2s ease;
  user-select: none;
  font-size: 0.98rem;
  line-height: 1.2;
}

.pop-btn-primary {
  background-color: var(--color-coral);
  color: var(--color-white);
  box-shadow: var(--shadow-pop);
}

.pop-btn-primary:hover {
  background-color: var(--color-coral-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-pop-lg);
}

.pop-btn-primary:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--color-slate);
}

.pop-btn-yellow {
  background-color: var(--color-yellow);
  color: var(--color-slate);
  box-shadow: var(--shadow-pop);
}

.pop-btn-yellow:hover {
  background-color: #ffd84d;
  transform: translateY(-2px);
  box-shadow: var(--shadow-pop-lg);
}

.pop-btn-purple {
  background-color: var(--color-purple);
  color: var(--color-white);
  box-shadow: var(--shadow-pop);
}

.pop-btn-purple:hover {
  background-color: var(--color-purple-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-pop-lg);
}

.pop-btn-ghost {
  background-color: var(--color-white);
  color: var(--color-slate);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.pop-btn-ghost:hover {
  border-color: var(--color-slate);
  box-shadow: var(--shadow-pop);
  transform: translateY(-2px);
}

.pop-btn-lg {
  padding: 15px 32px;
  font-size: 1.1rem;
}

.pop-btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
}

/* 徽章 Badge */
.pop-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  border: 1.5px solid currentColor;
}

.badge-coral {
  background-color: var(--color-coral-light);
  color: var(--color-coral-dark);
  border-color: var(--color-coral);
}

.badge-yellow {
  background-color: var(--color-yellow-light);
  color: #8c7300;
  border-color: #e5c53b;
}

.badge-purple {
  background-color: var(--color-purple-light);
  color: var(--color-purple);
  border-color: var(--color-purple);
}

.badge-mint {
  background-color: var(--color-mint-light);
  color: #17684d;
  border-color: #79caa8;
}

/* 猫爪贴纸与气泡 */
.paw-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 卡片风格 */
.pop-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: 28px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.pop-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-coral);
}

/* 节标题 */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-slate);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-sec);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* 网格 */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* 响应式断点 */
@media (max-width: 992px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .section-title {
    font-size: 1.85rem;
  }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .section-header {
    margin-bottom: 32px;
  }
  .pop-card {
    padding: 20px;
  }
}