/* ==========================================================================
   蓝河工具箱 (Lanhe Toolbox) - 全局样式表 (iOS 风格浅色版)
   主题色系：基于logo.png提取的科技蓝 (#3c50a0, #506ec8) 及 iOS 经典设计语言
   ========================================================================== */

/* 变量声明 */
:root {
  --color-bg-base: #f5f5f7;
  --color-bg-surface: #ffffff;
  --color-bg-card: #ffffff;
  --color-border: rgba(0, 0, 0, 0.06);
  --color-border-hover: rgba(60, 80, 160, 0.25);
  
  /* 品牌主题色 & iOS 规范色 */
  --color-primary: #3c50a0;
  --color-primary-light: #506ec8;
  --color-primary-dark: #273b8c;
  
  --color-text-primary: #1d1d1f;      /* Apple 经典主要文字 */
  --color-text-secondary: #6e6e73;    /* Apple 经典次要文字 */
  --color-text-muted: #86868b;        /* Apple 辅助说明文字 */
  --color-success: #34c759;           /* iOS 经典绿色开关 */
  --color-warning: #ff9500;           /* iOS 经典黄色警告 */
  
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "SF Compact Display", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-normal: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 12px 30px 0 rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 25px -5px rgba(60, 80, 160, 0.15);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  overflow-x: hidden;
  position: relative;
}

/* iOS 风格顶部氛围背景光 */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 600px;
  background: radial-gradient(circle at top, rgba(60, 80, 160, 0.05) 0%, rgba(245, 245, 247, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

/* 链接 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

/* 导航栏 (iOS 模糊半透明) */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-img {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
  border-radius: 0.45rem;
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: #000000;
  letter-spacing: -0.02em;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: 0.25rem 0;
  position: relative;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 80%;
}

.header-cta {
  display: flex;
  align-items: center;
}

.btn-header {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--color-primary);
  border: 1px solid transparent;
  border-radius: 99px; /* iOS 胶囊样式 */
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-header:hover {
  background: var(--color-primary-light);
  transform: scale(1.02);
}

/* 汉堡菜单按钮 (移动端) */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

.menu-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: var(--color-text-primary);
}

/* 移动端导航抽屉 */
.mobile-nav {
  display: none;
  position: fixed;
  top: 3.75rem;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  z-index: 49;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.02);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  color: var(--color-primary);
}

/* 主体内容 */
.main {
  flex: 1;
}

/* 按钮通用 - iOS 圆角样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 99px; /* iOS 典型胶囊按钮 */
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(60, 80, 160, 0.2);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(60, 80, 160, 0.3);
}

.btn-secondary {
  background: rgba(0, 0, 0, 0.04);
  color: var(--color-primary);
  border: 1px solid transparent;
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.08);
  transform: translateY(-1px);
}

/* iOS 风格卡片 (纯白背景, 轻柔边框与柔和阴影) */
.glass-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: 1.25rem; /* 20px 圆角 */
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--color-border-hover);
  transform: scale(1.01);
  box-shadow: var(--shadow-lg);
}

/* 页脚样式 (浅色精致排版) */
.footer {
  background: #ffffff;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  padding: 4rem 1.5rem 2rem;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1.25fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand .logo-text {
  font-size: 1.35rem;
}

.footer-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  max-width: 320px;
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-text-primary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-link:hover {
  color: var(--color-primary);
  padding-left: 2px;
}

.footer-info-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.825rem;
  color: var(--color-text-muted);
}

.footer-beian {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.footer-beian:hover {
  color: var(--color-primary);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-link {
  color: var(--color-text-muted);
}

.footer-bottom-link:hover {
  color: var(--color-text-secondary);
}

/* 隐藏文本的无障碍类 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .footer-container {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-list {
    display: none;
  }

  .header-container {
    gap: 0.75rem;
  }

  .header-cta {
    display: flex;
    margin-left: auto;
  }

  .btn-header {
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
  }

  .btn-header svg {
    width: 1rem;
    height: 1rem;
  }

  .btn-header span {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
}

/* 微动效 */
@keyframes fadeIn {
  from { opacity: 1; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  opacity: 1;
  animation: fadeIn 0.35s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 4px 12px rgba(60, 80, 160, 0.2); }
  50% { box-shadow: 0 4px 20px rgba(60, 80, 160, 0.4); }
}

.pulse-glow {
  animation: pulseGlow 2.5s infinite ease-in-out;
}