/* diyjz 企业官网 - 前台响应式样式 */
:root {
  --primary: #1e5eff;
  --primary-dark: #0f1e3d;
  --primary-soft: #eef3ff;
  --text: #1a2233;
  --text-light: #5a6478;
  --border: #e5e9f2;
  --bg-gray: #f5f7fa;
  --radius: 8px;
  --shadow: 0 4px 20px rgba(15, 30, 61, 0.08);
  --container: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text); line-height: 1.7; background: #fff;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.center { text-align: center; margin-top: 40px; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; }
.logo-mark {
  width: 36px; height: 36px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #4d8bff);
  color: #fff; font-size: 20px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.site-nav { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 16px; border-radius: 6px; font-size: 15px; color: var(--text); transition: 0.2s;
}
.nav-link:hover { color: var(--primary); background: var(--primary-soft); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; transition: 0.3s; border-radius: 2px; }

/* ---------- 轮播 ---------- */
.hero { position: relative; }
.hero-slides { position: relative; height: 480px; overflow: hidden; }
.hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity 0.8s; background: var(--primary-dark); }
.hero-slide.show { opacity: 1; z-index: 1; }
.hero-slide img { width: 100%; height: 100%; object-fit: cover; }
.hero-mask { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10, 20, 45, 0.75), rgba(10, 20, 45, 0.25)); }
.hero-caption { position: relative; z-index: 2; height: 100%; display: flex; flex-direction: column; justify-content: center; color: #fff; max-width: var(--container); }
.hero-caption h2 { font-size: 40px; margin-bottom: 14px; letter-spacing: 1px; }
.hero-caption p { font-size: 17px; opacity: 0.9; margin-bottom: 28px; max-width: 560px; }
.hero-dots { position: absolute; bottom: 22px; left: 0; right: 0; text-align: center; z-index: 3; }
.dot {
  width: 10px; height: 10px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255, 255, 255, 0.45); margin: 0 5px; transition: 0.3s;
}
.dot.active { background: #fff; width: 24px; border-radius: 6px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 12px 32px; border-radius: var(--radius);
  font-size: 15px; font-weight: 500; cursor: pointer; border: 1px solid transparent; transition: 0.25s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #1a4fd6; transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--primary-dark); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-block { width: 100%; border: none; }

/* ---------- 通用区块 ---------- */
.section { padding: 80px 0; }
.section-gray { background: var(--bg-gray); }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head h2 { font-size: 30px; position: relative; display: inline-block; padding-bottom: 14px; }
.section-head h2::after {
  content: ""; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 48px; height: 3px; background: var(--primary); border-radius: 2px;
}
.section-sub { color: #a0a8b8; font-size: 13px; letter-spacing: 3px; margin-top: 6px; }

/* ---------- 首页简介 + 统计 ---------- */
.intro-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center; }
.intro-text p { color: var(--text-light); font-size: 15.5px; margin-bottom: 14px; }
.stats-box {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
  background: var(--primary-soft); border-radius: 14px; padding: 34px 28px;
}
.stat { text-align: center; }
.stat-num { font-size: 34px; font-weight: 800; color: var(--primary); }
.stat-label { color: var(--text-light); font-size: 14px; margin-top: 4px; }

/* ---------- 卡片网格 ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: 0.3s; display: block;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.card-cover { height: 190px; overflow: hidden; }
.card-cover img { width: 100%; height: 100%; object-fit: cover; transition: 0.4s; }
.card:hover .card-cover img { transform: scale(1.06); }
.img-placeholder {
  width: 100%; height: 100%;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}
.card-body { padding: 22px; }
.card-body h3 { font-size: 18px; margin: 10px 0 8px; }
.card-body p { color: var(--text-light); font-size: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.more { display: inline-block; margin-top: 12px; color: var(--primary); font-size: 14px; }
.tag {
  display: inline-block; font-size: 12px; color: var(--primary); background: var(--primary-soft);
  padding: 2px 10px; border-radius: 20px;
}

/* ---------- 新闻 ---------- */
.news-list { display: flex; flex-direction: column; gap: 22px; }
.news-row {
  display: grid; grid-template-columns: 220px 1fr; gap: 24px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: 0.3s;
}
.news-row:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.news-cover { height: 150px; overflow: hidden; }
.news-cover img, .news-cover .img-placeholder { width: 100%; height: 100%; object-fit: cover; }
.news-info { padding: 18px 22px 18px 0; display: flex; flex-direction: column; }
.news-info h3 { font-size: 18px; margin: 8px 0; }
.news-info p { color: var(--text-light); font-size: 14px; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-meta { display: flex; gap: 18px; color: #a0a8b8; font-size: 13px; }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(120deg, var(--primary-dark), var(--primary)); color: #fff; padding: 64px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.cta-inner h2 { font-size: 28px; margin-bottom: 8px; }
.cta-inner p { opacity: 0.85; }

/* ---------- 内页横幅 ---------- */
.page-banner {
  background: linear-gradient(120deg, var(--primary-dark), var(--primary));
  color: #fff; padding: 72px 0; text-align: center;
}
.page-banner h1 { font-size: 32px; margin-bottom: 10px; }
.crumb { font-size: 13px; opacity: 0.75; }
.crumb a:hover { text-decoration: underline; }

/* ---------- 筛选 ---------- */
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.chip {
  padding: 7px 20px; border-radius: 20px; border: 1px solid var(--border);
  font-size: 14px; color: var(--text-light); transition: 0.2s;
}
.chip:hover, .chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.empty-tip { text-align: center; color: #a0a8b8; padding: 60px 0; }

/* ---------- 详情页 ---------- */
.detail-wrap { max-width: 900px; }
.detail-head h1 { font-size: 28px; margin: 12px 0; }
.detail-meta { color: #a0a8b8; font-size: 13px; display: flex; gap: 20px; }
.detail-cover { margin: 28px 0; border-radius: var(--radius); overflow: hidden; }
.detail-cover img { width: 100%; max-height: 420px; object-fit: cover; }
.detail-summary {
  background: var(--primary-soft); border-left: 4px solid var(--primary);
  padding: 18px 22px; border-radius: 0 var(--radius) var(--radius) 0; margin: 24px 0;
}
.detail-content p { color: var(--text-light); font-size: 15.5px; margin-bottom: 16px; }
.detail-back { margin: 40px 0; }

/* ---------- 分页 ---------- */
.pager { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 46px; }
.pager a, .pager .disabled {
  padding: 8px 20px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.pager a:hover { border-color: var(--primary); color: var(--primary); }
.pager .disabled { color: #c0c6d2; }
.pager-info { color: var(--text-light); font-size: 14px; }

/* ---------- 关于我们 ---------- */
.about-text { max-width: 900px; margin: 0 auto; }
.about-text p { color: var(--text-light); font-size: 15.5px; margin-bottom: 16px; text-indent: 2em; }
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.value-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 24px; text-align: center; transition: 0.3s; }
.value-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.value-card h3 { font-size: 18px; color: var(--primary); margin-bottom: 10px; }
.value-card p { color: var(--text-light); font-size: 14px; }
.timeline { max-width: 760px; margin: 0 auto; }
.timeline-item { display: flex; gap: 26px; position: relative; padding-bottom: 36px; }
.timeline-item::before {
  content: ""; position: absolute; left: 58px; top: 14px; bottom: 0;
  width: 2px; background: var(--border);
}
.timeline-item:last-child::before { display: none; }
.timeline-year {
  width: 76px; height: 32px; flex-shrink: 0; border-radius: 20px;
  background: var(--primary); color: #fff; font-weight: 600; font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
.timeline-body { padding-top: 3px; }
.timeline-body p { color: var(--text-light); }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 46px; align-items: start; }
.contact-info h2, .contact-form-box h2 { font-size: 24px; margin-bottom: 26px; }
.info-item { margin-bottom: 22px; }
.info-item h4 { color: #a0a8b8; font-size: 13px; font-weight: 500; margin-bottom: 6px; }
.info-item p { font-size: 17px; font-weight: 500; }
.contact-form-box { background: var(--bg-gray); border-radius: 14px; padding: 36px; }
.form-notice { padding: 12px 18px; border-radius: var(--radius); margin-bottom: 20px; font-size: 14px; }
.form-notice.ok { background: #e8f8ef; color: #0d8a4d; }
.form-notice.err { background: #fdeeee; color: #c0392b; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-item { margin-bottom: 18px; }
.form-item label { display: block; font-size: 14px; margin-bottom: 7px; color: var(--text); }
.form-item label i { color: #c0392b; font-style: normal; }
.form-item input, .form-item textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 14px; font-family: inherit; transition: 0.2s; background: #fff;
}
.form-item input:focus, .form-item textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30, 94, 255, 0.12);
}
.honeypot { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--primary-dark); color: #b8c2d8; padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 44px; }
.footer-logo { color: #fff; font-size: 20px; font-weight: 700; margin-bottom: 14px; }
.footer-desc { font-size: 14px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col p { font-size: 14px; margin-bottom: 8px; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 20px 0;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: #8d99b5;
}
.footer-bottom a { color: #8d99b5; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 30px; width: 42px; height: 42px;
  background: var(--primary); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: 0.3s; z-index: 90; box-shadow: var(--shadow);
}
.back-top.show { opacity: 1; pointer-events: auto; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .intro-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-slides { height: 420px; }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 12px 20px 20px;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .site-nav.open { display: flex; }
  .hero-slides { height: 360px; }
  .hero-caption h2 { font-size: 26px; }
  .hero-caption p { font-size: 15px; }
  .section { padding: 56px 0; }
  .card-grid { grid-template-columns: 1fr; }
  .news-row { grid-template-columns: 1fr; }
  .news-cover { height: 180px; }
  .news-info { padding: 0 18px 18px; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .stats-box { grid-template-columns: 1fr 1fr; padding: 24px 18px; }
  .stat-num { font-size: 26px; }
  .cta-inner { justify-content: center; text-align: center; }
  .page-banner { padding: 52px 0; }
  .page-banner h1 { font-size: 26px; }
  .value-grid { grid-template-columns: 1fr; }
  .timeline-item { flex-direction: column; gap: 12px; }
  .timeline-item::before { display: none; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-slides { height: 300px; }
  .hero-caption h2 { font-size: 22px; }
  .btn { padding: 10px 24px; }
  .contact-form-box { padding: 24px 18px; }
}