/* 宠物护理品牌 PETBIAO 网站样式表 */
:root {
  /* 品牌配色 - 基于 Logo 橄榄绿 */
  --primary: #a4b353;
  --primary-dark: #7a8a3a;
  --primary-light: #c4d16e;
  --primary-soft: #f0f4d8;
  --primary-very-soft: #f8f9ed;
  
  /* 中性色 */
  --text-dark: #2d3325;
  --text-body: #55594b;
  --text-muted: #7f8572;
  --white: #ffffff;
  --bg-light: #fafbf5;
  --border: #e3e8d1;
  
  /* 辅助色 */
  --accent: #e8927c;
  --accent-soft: #fdf0ec;
  --shadow: 0 4px 24px rgba(124, 139, 58, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.25s ease;
}

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-body);
  line-height: 1.7;
  background-color: var(--white);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 92%;
  max-width: 1200px;
  margin: 0 auto;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(124, 139, 58, 0.25);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-dark);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--white);
}

.btn-white {
  background-color: var(--white);
  color: var(--primary-dark);
}

.btn-white:hover {
  background-color: var(--primary-soft);
}

/* 头部导航 */
.header {
  background-color: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 22px;
  color: var(--text-dark);
}

.logo img {
  height: 42px;
  width: auto;
}

.nav {
  display: flex;
  gap: 36px;
}

.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-dark);
  position: relative;
}

.nav a:hover,
.nav a.active {
  color: var(--primary-dark);
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-very-soft);
  color: var(--primary-dark);
  transition: var(--transition);
}

.icon-btn:hover {
  background-color: var(--primary-soft);
}

.mobile-menu {
  display: none;
}

/* 通用标题区 */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 52px;
}

.section-title .tag {
  display: inline-block;
  padding: 6px 18px;
  background-color: var(--primary-soft);
  color: var(--primary-dark);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.section-title h2 {
  font-size: 34px;
  color: var(--text-dark);
  margin-bottom: 14px;
  font-weight: 700;
}

.section-title p {
  font-size: 16px;
  color: var(--text-muted);
}

/* 页脚 */
.footer {
  background-color: var(--text-dark);
  color: #c8d0b0;
  padding: 70px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 50px;
}

.footer-brand img {
  height: 50px;
  margin-bottom: 18px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 280px;
}

.footer h4 {
  color: var(--white);
  font-size: 16px;
  margin-bottom: 22px;
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: #9ca58a;
}

/* 响应式 */
@media (max-width: 900px) {
  .nav {
    display: none;
  }
  
  .mobile-menu {
    display: block;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .section-title h2 {
    font-size: 26px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
}