/* ============================================================
   猎货通 · base.css
   设计令牌 / reset / 基础排版 / 按钮 / 布局工具类
   （首页与专题页共享）
   ============================================================ */

/* ============ 设计令牌（对齐产品 UI 设计说明） ============ */
:root {
  --primary: #1890ff;
  --primary-hover: #40a9ff;
  --primary-ink: #0a6cff;
  --success: #52c41a;
  --warning: #fa8c16;
  --danger: #ff4d4f;
  --ink: #0a2540;
  --ink-2: #102f54;
  --text: #1f2937;
  --text-2: #5b6472;
  --bg: #f5f7fa;
  --card: #ffffff;
  --line: #e8edf3;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-card: 0 2px 8px rgba(10, 37, 64, 0.06);
  --shadow-pop: 0 8px 28px rgba(10, 37, 64, 0.14);
  --maxw: 1160px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { line-height: 1.3; color: var(--ink); margin: 0 0 0.5em; }
h1 { font-size: clamp(28px, 5vw, 46px); font-weight: 900; letter-spacing: -0.5px; }
h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; }
h3 { font-size: 19px; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--primary-ink); text-decoration: none; }
a:hover { color: var(--primary-hover); }
/* 焦点样式必须保留（a11y） */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px;
}
img, svg { max-width: 100%; }

/* ============ 布局工具类 ============ */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section.alt { background: #fff; }
.lead { font-size: 17px; color: var(--text-2); max-width: 760px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px;
  color: var(--primary-ink); background: rgba(24, 144, 255, 0.1);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 14px; text-transform: none;
}
.center { text-align: center; }
.center .lead { margin-left: auto; margin-right: auto; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font); font-size: 15px; font-weight: 700;
  padding: 13px 26px; border-radius: var(--radius-sm); cursor: pointer;
  border: 2px solid transparent; transition: all 0.18s ease; line-height: 1;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(24, 144, 255, 0.32); }
.btn-primary:hover { background: var(--primary-hover); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.45); }
.btn-ghost:hover { background: rgba(255,255,255,0.12); color: #fff; }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: #14365f; color: #fff; }
.btn-outline { background: #fff; color: var(--primary-ink); border-color: var(--line); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary-ink); }

/* ============ 通用卡片（跨页复用） ============ */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: 26px; box-shadow: var(--shadow-card); transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-pop); }
.card .ic {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(24,144,255,0.1); color: var(--primary-ink); margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--text-2); font-size: 15px; margin: 0; }

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }