/* ============================================================
   建沅网络 · 站点级共享样式（base.css）
   SITE-001：全站禁止内联样式与 <style>，样式一律置于 assets/css/
   覆盖：设计变量 / 排版 / 头部导航 / 主容器 / 卡片 / 按钮 /
         网格 / 标签 / 规矩卡 / 时间线 / 页脚
   ============================================================ */

:root {
  --color-primary: #0e7490;        /* 深水蓝：品牌主色 */
  --color-primary-dark: #155e75;
  --color-accent: #06b6d4;         /* 活水青：点缀色 */
  --color-bg: #ffffff;
  --color-surface: #f0f9ff;        /* 浅水色底 */
  --color-text: #0f172a;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 28px rgba(14, 116, 144, 0.14);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--color-border);
}

.site-nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--color-text);
  text-decoration: none;
}

.brand-mark { color: var(--color-primary); }

.nav-links {
  display: flex;
  gap: 1.4rem;
  margin-left: auto;
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a:hover { color: var(--color-primary); }

.nav-links a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 700;
}

/* ---------- 主容器与区块 ---------- */
.site-main { max-width: 1080px; margin: 0 auto; padding: 0 1.25rem; }

.section { padding: 3.5rem 0; }

.section-title { font-size: 1.6rem; line-height: 1.3; margin: 0 0 0.5rem; }

.section-sub { color: var(--color-muted); margin: 0 0 2rem; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.card h3 { margin: 0 0 0.6rem; font-size: 1.1rem; line-height: 1.4; }

.card p { margin: 0; color: var(--color-muted); font-size: 0.95rem; }

/* ---------- 标签 / 角标 ---------- */
.tag {
  display: inline-block;
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  background: var(--color-surface);
  border: 1px solid rgba(14, 116, 144, 0.25);
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 0.7rem;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 0.72rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.btn-primary { background: var(--color-primary); color: #ffffff; }

.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

.btn-ghost { border: 1px solid var(--color-border); color: var(--color-text); }

.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- 通用网格 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr; }
}

/* ---------- 三条规矩 ---------- */
.rule-card { position: relative; }

.rule-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.8rem;
}

/* ---------- 发展节拍时间线 ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline li {
  position: relative;
  padding: 0 0 1.6rem 1.8rem;
  border-left: 2px solid var(--color-border);
  margin-left: 0.4rem;
}

.timeline li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -0.42rem;
  top: 0.35rem;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-primary);
}

.timeline .t-label { font-weight: 700; color: var(--color-primary); }

.timeline p { margin: 0.25rem 0 0; color: var(--color-muted); }

/* ---------- 询盘表单 ---------- */
.lead-form {
  max-width: 560px;
  margin: 2rem auto 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.6rem 1.6rem 1.4rem;
  text-align: left;
  box-shadow: var(--shadow-sm);
}

.lead-form h3 {
  margin: 0 0 1.1rem;
  color: var(--color-text);
  font-size: 1.05rem;
}

.lead-form-row { margin-bottom: 1rem; }

.lead-form-row label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--color-text);
}

.lead-form-row input,
.lead-form-row textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
}

.lead-form-row input:focus,
.lead-form-row textarea:focus {
  outline: 2px solid rgba(14, 116, 144, 0.3);
  border-color: var(--color-primary);
}

.lead-form .btn { border: none; cursor: pointer; }

.lead-form .lead-form-status {
  margin: 0.9rem 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  margin-top: 2rem;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.8rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem 1.5rem;
}

.footer-brand { font-weight: 700; color: var(--color-text); }

.footer-inner p { margin: 0; color: var(--color-muted); font-size: 0.9rem; }

.footer-links {
  margin-left: auto;
  display: flex;
  gap: 1.1rem;
}

.footer-links a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

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

@media (max-width: 720px) {
  .footer-links { margin-left: 0; }
}