/**
 * 东儿科技 - UI/UX Pro Max 设计系统
 * 风格: Trust & Authority / Enterprise Gateway
 * 配色: 专业深蓝 + 蓝色 CTA，高对比可访问性
 */
@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@300;400;500;600;700&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

:root {
  /* 主色 - 深蓝/海军 */
  --color-primary: #0F172A;
  --color-primary-hover: #1e293b;
  --color-secondary: #334155;
  --color-cta: #0369A1;
  --color-cta-hover: #0284c7;
  --color-bg: #F8FAFC;
  --color-bg-card: #ffffff;
  --color-text: #020617;
  --color-text-muted: #475569;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  /* 排版 */
  --font-heading: "Lexend", "Microsoft YaHei", sans-serif;
  --font-body: "Source Sans 3", "Microsoft YaHei", sans-serif;

  /* 动效 - 150-300ms 符合 UX 规范 */
  --transition-fast: 150ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* 圆角与阴影 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 10px 24px rgba(15, 23, 42, 0.12);
}

/* 尊重用户「减少动效」设置 */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-smooth: 0ms;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 全局基础 */
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-primary);
}

/* 可点击元素统一：手型 + 焦点环（符合 Pre-Delivery Checklist） */
a, button, [role="button"], .cursor-pointer,
.navbar-nav a, .sidebar a, .feature-content, .feature-more,
.bellows__header, .back-to-top {
  cursor: pointer;
}

a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible,
.navbar-nav a:focus-visible,
.sidebar a:focus-visible,
.back-to-top:focus-visible {
  outline: 2px solid var(--color-cta);
  outline-offset: 2px;
}

/* 链接悬停使用主题色 */
a:hover {
  color: var(--color-cta);
  transition: color var(--transition-base);
}