/* ============================================================
   base.css — 主题变量 + 重置 + 全站公共组件
   换整站配色：只改下面 :root 里的颜色变量，不用动 HTML / JS
   当前主题：A 简约留白（墨绿 #1D6B58）
   ============================================================ */
:root {
  --color-primary: #1D6B58;
  --color-primary-dark: #14503F;
  --color-primary-soft: #E8F1ED;
  --color-bg: #FFFFFF;
  --color-surface: #F5F7F6;
  --color-border: #E3E8E5;
  --color-text: #1A1A1A;
  --color-muted: #5F6B66;
  --color-white: #FFFFFF;
  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 14px;
  --max-width: 1200px;
  --shadow: 0 6px 24px rgba(26, 42, 35, .06);
  --shadow-hover: 0 12px 32px rgba(26, 42, 35, .10);
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, h4 { margin: 0; line-height: 1.3; font-weight: 600; }
h1 { font-size: 36px; }
h2 { font-size: 28px; }
h3 { font-size: 18px; }
h4 { font-size: 15px; }
p { margin: 0 0 14px; }
ul, ol { margin: 0; padding: 0; list-style: none; }
code { background: var(--color-surface); padding: 2px 6px; border-radius: var(--radius-sm); font-size: 13px; }
[hidden] { display: none !important; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }
.section--tight { padding: 44px 0; }
.section--soft { background: var(--color-surface); }

/* ---------- 通用文字块 ---------- */
.eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}
.section-head h2 { font-size: 28px; }
.text-link { color: var(--color-primary); font-size: 14px; white-space: nowrap; }
.text-link:hover { color: var(--color-primary-dark); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 15px;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.btn-primary { background: var(--color-primary); color: var(--color-white); }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary-soft); }
.btn-light { background: var(--color-white); color: var(--color-primary-dark); }
.btn-light:hover { background: var(--color-primary-soft); }
.btn-block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}
.header-inner { display: flex; align-items: center; gap: 32px; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  width: 30px; height: 30px;
  border-radius: 8px 8px 12px 12px;
  background: var(--color-primary);
  position: relative;
}
.brand-mark::after {
  content: ""; position: absolute;
  left: 6px; right: 6px; top: -5px; height: 5px;
  border-radius: 3px 3px 0 0;
  background: var(--color-primary-dark);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 19px; letter-spacing: .06em; }
.brand-text small { font-size: 10px; letter-spacing: .18em; color: var(--color-muted); }
.nav { display: flex; align-items: center; gap: 30px; margin-left: auto; }
.nav-link { font-size: 15px; color: var(--color-muted); position: relative; padding: 6px 0; }
.nav-link:hover, .nav-link.is-active { color: var(--color-primary); }
.nav-link.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--color-primary); border-radius: 2px;
}
.header-cta { flex-shrink: 0; padding: 9px 20px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; margin-left: auto; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-text); margin: 5px 0; border-radius: 2px; }

/* ---------- 面包屑 ---------- */
.breadcrumb { display: flex; gap: 10px; font-size: 13px; color: var(--color-muted); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span[aria-hidden] { color: var(--color-border); }

/* ---------- 页头 ---------- */
.page-head { padding: 56px 0 40px; background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.page-head--compact { padding: 26px 0 0; background: var(--color-bg); border: 0; }
.page-head h1 { font-size: 34px; margin-bottom: 12px; }
.page-head p { color: var(--color-muted); max-width: 660px; margin: 0; }

/* ---------- 标签 / 徽章 ---------- */
.badge {
  position: absolute; top: 14px; left: 14px;
  background: var(--color-primary); color: var(--color-white);
  font-size: 12px; padding: 4px 10px; border-radius: 20px;
}
.tag {
  display: inline-block; font-size: 12px; color: var(--color-primary);
  background: var(--color-primary-soft); padding: 5px 12px; border-radius: 20px;
}

/* ---------- 询盘引导条 ---------- */
.cta-bar { background: var(--color-primary); color: var(--color-white); padding: 40px 0; }
.cta-bar__inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.cta-bar h2 { font-size: 24px; margin-bottom: 6px; }
.cta-bar p { margin: 0; opacity: .85; font-size: 14px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #14211C; color: #C9D4CE; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.4fr auto; gap: 40px; padding-bottom: 40px; }
.brand--footer { color: var(--color-white); margin-bottom: 16px; }
.brand--footer .brand-text small { color: #8FA49A; }
.footer-desc { font-size: 13px; max-width: 320px; color: #9FB2A8; }
.footer-col h4 { color: var(--color-white); margin-bottom: 16px; }
.footer-col a, .footer-col p { display: block; font-size: 13px; margin: 0 0 9px; color: #9FB2A8; }
.footer-col a:hover { color: var(--color-white); }
.footer-col--qr { text-align: center; }
.footer-col--qr img { margin: 0 auto 8px; border-radius: var(--radius-sm); }
.footer-col--qr span { display: block; font-size: 12px; color: #8FA49A; }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 16px;
  border-top: 1px solid #26362E; padding: 18px 24px;
  font-size: 12px; color: #8FA49A;
}

/* ---------- 表单 ---------- */
.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 18px; }
.field > span { font-size: 14px; }
.field em { color: #C0492F; font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  outline: none;
  transition: border-color .18s ease;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--color-primary); }
.field textarea { resize: vertical; min-height: 110px; }
.field input.is-invalid, .field select.is-invalid { border-color: #C0492F; }
.field-error { color: #C0492F; font-size: 12px; min-height: 0; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-notice { padding: 12px 14px; border-radius: var(--radius-sm); font-size: 14px; margin-bottom: 16px; }
.form-notice.is-ok { background: var(--color-primary-soft); color: var(--color-primary-dark); }
.form-notice.is-demo { background: #FFF6E5; color: #854F0B; }
.form-notice.is-error { background: #FCEBEB; color: #A32D2D; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  h1 { font-size: 30px; }
  h2 { font-size: 24px; }
  .section { padding: 52px 0; }
  .header-inner { height: 62px; gap: 16px; }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .nav {
    position: absolute; top: 62px; left: 0; right: 0;
    background: var(--color-bg); border-bottom: 1px solid var(--color-border);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px 24px 16px; display: none;
  }
  .nav.is-open { display: flex; }
  .nav-link { padding: 12px 0; border-bottom: 1px solid var(--color-border); }
  .nav-link.is-active::after { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-col:first-child, .footer-col--qr { grid-column: 1 / -1; }
  .cta-bar__inner { flex-direction: column; align-items: flex-start; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  h1 { font-size: 26px; }
  h2 { font-size: 21px; }
  .page-head { padding: 40px 0 30px; }
  .footer-grid { grid-template-columns: 1fr; }
}