/* 通用样式 - 智能健康管理系统官网 */

:root {
  --primary-color: #00b894;
  --primary-dark: #00a085;
  --primary-light: #55efc4;
  --secondary-color: #00cec9;
  --accent-color: #fdcb6e;
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --text-light: #b2bec3;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fffe;
  --bg-dark: #2d3436;
  --border-color: #dfe6e9;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-fluid {
  max-width: 100%;
  padding: 0 20px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
  transition: all 0.3s ease;
  position: relative;
}

.navbar-logo:hover {
  opacity: 0.9;
}

.navbar-logo-img {
  height: 42px;
  width: auto;
  display: block;
}

.navbar-logo-divider {
  width: 1px;
  height: 28px;
  background: linear-gradient(to bottom, transparent, var(--border-color), transparent);
  margin: 0 0.25rem;
}

.navbar-logo-text {
  display: inline-flex;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  align-items: center;
}

.navbar-menu a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--primary-color);
}

.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.navbar-menu a:hover::after,
.navbar-menu a.active::after {
  width: 100%;
}

.navbar-cta {
  padding: 0.625rem 1.5rem;
  background-color: var(--primary-color);
  color: white !important;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.navbar-cta::after {
  display: none !important;
}

.navbar-cta:hover {
  background-color: var(--primary-dark);
  color: white !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all 0.3s ease;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  outline: none;
}

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

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

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

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

.btn-large {
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
}

/* 卡片 */
.card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 章节标题 */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-subtitle {
  color: var(--primary-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

/* 网格布局 */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

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

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

/* 页脚 */
.footer {
  background-color: var(--bg-dark);
  color: white;
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h3 {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  font-weight: 700;
}

.footer-section p {
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  color: var(--text-light);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1100px) {
  .navbar-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: white;
    flex-direction: column;
    padding: 2rem;
    transition: left 0.3s ease;
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    z-index: 999;
  }

  .navbar-menu.active {
    left: 0;
  }

  .navbar-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {

  .section-title {
    font-size: 2rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .btn-large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: 1.75rem;
  }

  .section {
    padding: 3rem 0;
  }

  .card {
    padding: 1.5rem;
  }
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* 工具类 */
.text-center {
  text-align: center;
}

.text-primary {
  color: var(--primary-color);
}

.bg-secondary {
  background-color: var(--bg-secondary);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.py-1 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-2 { padding-top: 1rem; padding-bottom: 1rem; }
.py-3 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-4 { padding-top: 2rem; padding-bottom: 2rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

/* ===== 返回顶部按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 32px;
  z-index: 999;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 184, 148, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
  box-shadow: 0 6px 24px rgba(0, 184, 148, 0.55);
  transform: translateY(-3px);
}

.back-to-top:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 184, 148, 0.35);
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 24px;
    right: 18px;
    width: 40px;
    height: 40px;
    font-size: 14px;
  }
}