/* ============================================================
   南京微相 Micro Phase 企业官网 · 全站样式
   纯 CSS，无第三方依赖，可自由修改
   ============================================================ */
:root {
  --primary: #0b5cab;      /* 主色·深蓝（科技感） */
  --primary-dark: #08427b;
  --accent: #12a5b0;       /* 强调色·青（医疗感） */
  --ink: #1a2b3c;          /* 正文墨色 */
  --ink-soft: #4a5b6d;
  --bg: #f6f9fc;
  --card: #ffffff;
  --line: #e3eaf1;
  --radius: 10px;
  --maxw: 1120px;
  font-size: 16px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--accent); }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand svg { flex: none; }
.brand-name { font-size: 1.15rem; font-weight: 700; color: var(--ink); }
.brand-name span { color: var(--primary); }
.main-nav ul { display: flex; gap: 6px; list-style: none; }
.main-nav a {
  display: block; padding: 8px 16px; border-radius: 6px;
  color: var(--ink-soft); font-weight: 500;
}
.main-nav a:hover { background: var(--bg); color: var(--primary); }
.main-nav a.active { color: var(--primary); background: #e8f1fa; }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  border-radius: 6px; padding: 8px 10px; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px; background: var(--ink);
  margin: 4px 0; transition: 0.2s;
}

/* ---------- 首屏 Banner ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, var(--accent) 130%);
  color: #fff; padding: 96px 0 88px;
}
.hero h1 { font-size: 2.3rem; line-height: 1.35; max-width: 720px; }
.hero p.sub { margin-top: 18px; font-size: 1.1rem; opacity: 0.92; max-width: 640px; }
.hero .hero-actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 28px; border-radius: 8px;
  font-weight: 600; transition: 0.2s;
}
.btn-primary { background: #fff; color: var(--primary); }
.btn-primary:hover { background: #eaf3fb; color: var(--primary-dark); }
.btn-outline { border: 1.5px solid rgba(255,255,255,0.75); color: #fff; }
.btn-outline:hover { background: rgba(255,255,255,0.12); color: #fff; }
.btn-solid { background: var(--primary); color: #fff; }
.btn-solid:hover { background: var(--primary-dark); color: #fff; }

/* ---------- 通用区块 ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--card); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-head .kicker {
  display: inline-block; color: var(--accent); font-weight: 700;
  letter-spacing: 2px; font-size: 0.85rem; margin-bottom: 10px;
}
.section-head h2 { font-size: 1.8rem; color: var(--ink); }
.section-head p { margin-top: 12px; color: var(--ink-soft); }

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

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(11, 92, 171, 0.10); }
.card img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
.card-body { padding: 22px; }
.card-body h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--ink); }
.card-body p { font-size: 0.94rem; color: var(--ink-soft); }

/* 数字亮点 */
.stat {
  text-align: center; padding: 28px 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
}
.stat .num { font-size: 1.9rem; font-weight: 800; color: var(--primary); }
.stat .num small { font-size: 1rem; font-weight: 600; }
.stat .label { margin-top: 6px; color: var(--ink-soft); font-size: 0.92rem; }

/* 图文两栏 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split img { border-radius: var(--radius); border: 1px solid var(--line); }
.split h2 { font-size: 1.6rem; margin-bottom: 16px; }
.split p + p { margin-top: 12px; }
.split ul.checklist { margin-top: 16px; list-style: none; }
.split ul.checklist li { padding-left: 28px; position: relative; margin-bottom: 8px; color: var(--ink-soft); }
.split ul.checklist li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z"/></svg>') center/12px no-repeat;
}

/* 列表页（产品/新闻） */
.page-banner {
  background: linear-gradient(120deg, var(--primary-dark), var(--primary));
  color: #fff; padding: 56px 0; text-align: center;
}
.page-banner h1 { font-size: 1.9rem; }
.page-banner p { margin-top: 10px; opacity: 0.9; }

/* 资讯动态（预留模块） */
.news-empty {
  text-align: center; padding: 64px 20px; color: var(--ink-soft);
  background: var(--card); border: 1px dashed var(--line); border-radius: var(--radius);
}
.news-item {
  display: flex; gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--line);
}
.news-item .date {
  flex: none; width: 76px; text-align: center; color: var(--primary);
  font-weight: 700; font-size: 0.9rem; padding-top: 4px;
}
.news-item h3 { font-size: 1.08rem; }
.news-item .tag {
  display: inline-block; font-size: 0.78rem; color: var(--accent);
  border: 1px solid var(--accent); border-radius: 999px;
  padding: 1px 10px; margin-left: 8px; vertical-align: 2px;
}
.news-item p { color: var(--ink-soft); font-size: 0.94rem; margin-top: 6px; }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact-info dt { font-weight: 700; margin-top: 20px; color: var(--ink); }
.contact-info dt:first-child { margin-top: 0; }
.contact-info dd { color: var(--ink-soft); margin-top: 4px; }
.form-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-weight: 600; margin-bottom: 6px; }
.form-field input, .form-field textarea, .form-field select {
  width: 100%; padding: 11px 14px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 0.95rem; font-family: inherit; background: #fff;
}
.form-field input:focus, .form-field textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
.form-note { font-size: 0.85rem; color: var(--ink-soft); margin-top: 10px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #10243a; color: #c3d2e0; margin-top: 0; }
.footer-inner { padding: 56px 20px 0; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.site-footer .footer-title { color: #fff; font-size: 1rem; margin-bottom: 14px; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #c3d2e0; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  margin-top: 40px; border-top: 1px solid rgba(255,255,255,0.12);
  padding: 18px 20px; text-align: center; font-size: 0.85rem; color: #8fa5ba;
}
.footer-bottom a { color: #8fa5ba; }

/* ---------- 响应式 ---------- */
/* ---------- 单页官网补充 ---------- */
section[id] { scroll-margin-top: 76px; }  /* 锚点跳转避开吸顶导航 */
.brand img, .brand > svg { height: 40px; width: auto; }

/* 三大业务板块：明显的类别结构 */
.audience-note {
  max-width: 760px; margin: -28px auto 44px; padding: 14px 22px;
  background: #eaf4f6; border-left: 4px solid var(--accent);
  border-radius: 6px; color: var(--ink-soft); font-size: 0.95rem;
  text-align: left;
}
.biz-block { padding: 40px 0 8px; }
.biz-block + .biz-block { border-top: 1px dashed var(--line); margin-top: 40px; }
.biz-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 10px; }
.biz-no {
  font-size: 2.6rem; font-weight: 800; line-height: 1;
  color: #d4e2f0; letter-spacing: 1px;
}
.biz-title h3 { font-size: 1.35rem; color: var(--ink); display: inline; }
.biz-title .biz-industry {
  display: inline-block; margin-left: 12px; font-size: 0.8rem; font-weight: 600;
  color: var(--accent); background: #e7f6f7; border-radius: 999px; padding: 2px 12px;
  vertical-align: 3px;
}
.biz-title p { color: var(--ink-soft); margin-top: 6px; max-width: 720px; }

/* 页脚 logo 白色版 */
.footer-logo { height: 38px; width: auto; margin-bottom: 14px; }

@media (max-width: 640px) {
  .biz-head { flex-direction: column; gap: 4px; }
  .biz-no { font-size: 2rem; }
}

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .hero { padding: 64px 0 56px; }
  .hero h1 { font-size: 1.6rem; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
  /* 移动端导航折叠 */
  .nav-toggle { display: block; }
  .main-nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line); padding: 12px 20px 18px;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 2px; }
  .main-nav a { padding: 12px 10px; }
}