/* ============================================================
   协会网 SaaS - 基础样式与通用组件
   适用于主站与分站
   ============================================================ */

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

:root {
  --text-1: #1A1A1A;
  --text-2: #4A4A4A;
  --text-3: #888;
  --text-4: #B0B0B0;
  --bg-page: #FFFFFF;
  --bg-section: #FAFAFA;
  --bg-card: #FFFFFF;
  --border: #EAEAEA;
  --border-strong: #D0D0D0;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10);
  --container: 1200px;
  --header-h: 72px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--text-1);
  background: var(--bg-page);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 11px 26px; border-radius: var(--radius); border: none;
  font-size: 15px; font-weight: 500; cursor: pointer; transition: var(--transition);
  white-space: nowrap; font-family: inherit;
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: var(--shadow-primary); }
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.06); color: #fff; }
.btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-ghost { background: var(--primary-soft); color: var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.btn-lg { padding: 14px 34px; font-size: 16px; }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-block { display: flex; width: 100%; }

/* ===== 区块标题 ===== */
.section { padding: 72px 0; }
.section-soft { background: var(--bg-section); }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 {
  font-size: 32px; font-weight: 700; color: var(--text-1);
  position: relative; display: inline-block; padding-bottom: 14px;
}
.section-title h2::after {
  content: ''; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 56px; height: 4px; border-radius: 2px; background: var(--gradient);
}
.section-title p { margin-top: 14px; color: var(--text-3); font-size: 16px; max-width: 680px; margin-left: auto; margin-right: auto; }
.section-title.left { text-align: left; }
.section-title.left h2::after { left: 0; transform: none; }
.section-title.left p { margin-left: 0; }

/* ===== Header（共享组件，由 header.js 注入）===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}
.site-header .container {
  height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 8px; background: var(--gradient);
  display: flex; align-items: center; justify-content: center; color: #fff;
  font-size: 18px; font-weight: 700; flex-shrink: 0;
}
.brand-text { color: var(--text-1); }
.brand-sub { font-size: 11px; color: var(--text-3); font-weight: 400; margin-top: 2px; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  padding: 8px 14px; border-radius: 6px; font-size: 15px; color: var(--text-2);
  font-weight: 500;
}
.nav-menu a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-menu a.active { color: var(--primary); background: var(--primary-soft); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text-1); border-radius: 1px;
  transition: var(--transition); position: relative;
}
.menu-toggle span + span { margin-top: 6px; }

/* ===== Footer ===== */
.site-footer {
  background: #1A1A1A; color: #B0B0B0; padding: 56px 0 24px; margin-top: 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .brand-logo { width: 36px; height: 36px; }
.footer-brand .name { color: #fff; font-size: 17px; font-weight: 700; }
.footer-desc { font-size: 13px; line-height: 1.7; color: #888; }
.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 16px; font-weight: 600; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 13px; color: #B0B0B0; }
.footer-col a:hover { color: var(--footer-accent); }
.footer-contact-item { display: flex; gap: 8px; font-size: 13px; margin-bottom: 10px; color: #B0B0B0; }
.footer-contact-item .ico { color: var(--footer-accent); flex-shrink: 0; }
.footer-qrcodes { display: flex; gap: 14px; margin-top: 12px; }
.footer-qrcode { text-align: center; }
.footer-qrcode .qr {
  width: 84px; height: 84px; background: #2A2A2A; border-radius: 6px;
  display: flex; align-items: center; justify-content: center; color: #666; font-size: 11px;
  border: 1px solid #333;
}
.footer-qrcode .label { font-size: 11px; color: #888; margin-top: 6px; }
.footer-bottom {
  border-top: 1px solid #2A2A2A; padding-top: 20px; text-align: center;
  font-size: 12px; color: #666;
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); transition: var(--transition); overflow: hidden;
}
.card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); transform: translateY(-2px); }

/* ===== 网格 ===== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== 标签 ===== */
.tag {
  display: inline-block; padding: 3px 10px; border-radius: 4px;
  font-size: 12px; font-weight: 500; background: var(--primary-soft); color: var(--primary);
}
.tag-accent { background: var(--accent-soft); color: var(--accent); }
.tag-gray { background: #F0F0F0; color: #666; }

/* ===== 表单 ===== */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 14px; color: var(--text-2); margin-bottom: 8px; font-weight: 500; }
.form-label .req { color: var(--primary); margin-left: 2px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--border-strong);
  border-radius: var(--radius); font-size: 14px; font-family: inherit;
  background: #fff; transition: var(--transition); color: var(--text-1);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
.form-textarea { min-height: 120px; resize: vertical; }
.form-hint { font-size: 12px; color: var(--text-3); margin-top: 6px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 18px 0; font-size: 13px; color: var(--text-3);
  display: flex; align-items: center; gap: 8px;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--text-4); }

/* ===== 响应式 ===== */
@media (max-width: 968px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 56px 0; }
  .section-title h2 { font-size: 26px; }
}
@media (max-width: 768px) {
  :root { --header-h: 60px; }
  .nav-menu, .header-actions .btn:not(.menu-toggle-btn) {
    display: none;
  }
  .nav-menu.open {
    display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0;
    background: #fff; padding: 12px; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md); gap: 2px; align-items: stretch;
  }
  .nav-menu.open a { padding: 12px 14px; }
  .menu-toggle { display: block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .container { padding: 0 16px; }
  .section { padding: 44px 0; }
  .section-title h2 { font-size: 24px; }
  .section-title p { font-size: 14px; }
  .btn-lg { padding: 12px 24px; font-size: 15px; }
}