/* ===== 湖南汉舟安全科技有限责任公司官网样式 ===== */
:root {
  --primary: #003477;
  --primary-2: #00428E;
  --accent: #C8161D;
  --light-blue: #eaf3fb;
  --text: #23313f;
  --muted: #5c6b7a;
  --bg: #ffffff;
  --bg-alt: #f5f8fc;
  --shadow: 0 10px 30px rgba(0, 52, 119, 0.10);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(0,52,119,0.08);
  transition: box-shadow .3s;
}
.site-header.scrolled { box-shadow: 0 4px 18px rgba(0,52,119,0.12); }
.header-inner { display: flex; align-items: center; gap: 28px; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo { width: 42px; height: 42px; object-fit: contain; }
.brand-text { line-height: 1.2; }
.brand-text strong { display: block; font-size: 20px; color: var(--primary); letter-spacing: 2px; }
.brand-text span { font-size: 9px; color: var(--muted); letter-spacing: .5px; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  padding: 8px 14px; font-size: 15px; color: var(--text); border-radius: 6px;
  transition: color .2s, background .2s;
}
.nav a:hover { color: var(--primary); background: var(--light-blue); }
.nav a.active { color: var(--primary); font-weight: bold; }
.header-contact { text-align: right; line-height: 1.3; flex-shrink: 0; }
.header-contact .tel-label { display: block; font-size: 11px; color: var(--muted); }
.header-contact .tel-num { font-size: 16px; font-weight: bold; color: var(--accent); }
.nav-toggle { display: none; }

/* ===== 首屏 ===== */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0;
  background: url("../images/hero.png") center/cover no-repeat;
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.55) 0%, rgba(255,255,255,.15) 40%, rgba(255,255,255,.75) 100%);
}
.hero-content { position: relative; z-index: 1; text-align: center; padding-top: 72px; }
.hero-en { font-size: 14px; letter-spacing: 6px; color: var(--primary-2); margin-bottom: 18px; }
.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  color: var(--primary);
  letter-spacing: 10px;
  text-shadow: 0 2px 20px rgba(255,255,255,.8);
}
.hero-sub { font-size: clamp(18px, 3vw, 26px); color: var(--primary-2); letter-spacing: 14px; margin: 14px 0 26px; }
.hero-desc { max-width: 640px; margin: 0 auto 36px; color: var(--text); font-size: 16px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; }
.btn {
  display: inline-block; padding: 13px 40px; border-radius: 40px; font-size: 16px;
  transition: transform .2s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 24px rgba(0,52,119,.35); }
.btn-primary:hover { background: var(--primary-2); }
.btn-ghost { border: 1.5px solid var(--primary); color: var(--primary); background: rgba(255,255,255,.7); }
.btn-ghost:hover { background: #fff; }

/* ===== 数据亮点 ===== */
.stats-bar { background: var(--primary); color: #fff; padding: 40px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat .stat-num { font-size: 46px; font-weight: 700; font-family: Georgia, serif; }
.stat .stat-plus { font-size: 20px; font-weight: 700; color: #ffd7d9; }
.stat p { font-size: 13px; opacity: .85; margin-top: 4px; }

/* ===== 通用 section ===== */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 54px; }
.section-en { font-size: 14px; letter-spacing: 4px; color: var(--accent); text-transform: uppercase; }
.section-head h2 { font-size: 34px; color: var(--primary); letter-spacing: 6px; margin-top: 6px; }
.section-head.light h2, .section-head.light .section-en { color: #fff; }
.section-line { width: 64px; height: 3px; background: var(--accent); margin: 16px auto 0; border-radius: 2px; }

/* ===== 企业简介 ===== */
.about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: start; }
.about-text h3 { color: var(--primary); font-size: 24px; margin-bottom: 14px; }
.about-text > p { margin-bottom: 20px; color: var(--muted); }
.about-text strong { color: var(--primary-2); }
.about-block { margin-bottom: 18px; }
.about-block h4 { color: var(--primary); font-size: 17px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.dot { width: 8px; height: 8px; background: var(--accent); border-radius: 50%; display: inline-block; }
.about-block p { font-size: 14.5px; color: var(--muted); }
.about-motto {
  margin-top: 24px; padding: 16px 22px; background: var(--light-blue);
  border-left: 4px solid var(--primary);
  color: var(--primary); font-size: 17px; letter-spacing: 3px; font-weight: bold;
  display: flex; flex-direction: column; gap: 2px;
}
.about-img img { border-radius: 12px; box-shadow: var(--shadow); width: 100%; object-fit: cover; }

/* ===== 业务范围 ===== */
.biz-tabs { display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.biz-tab {
  padding: 10px 28px; border: 1.5px solid var(--primary); background: transparent;
  color: var(--primary); font-size: 16px; border-radius: 30px; cursor: pointer;
  transition: all .25s; font-family: inherit;
}
.biz-tab:hover { background: var(--light-blue); }
.biz-tab.active { background: var(--primary); color: #fff; }
.biz-panel { display: none; animation: fadeUp .4s ease; }
.biz-panel.active { display: block; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.biz-lead { text-align: center; color: var(--primary-2); font-size: 17px; font-weight: bold; margin-bottom: 26px; }
.biz-list {
  max-width: 820px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px 36px;
  counter-reset: biz;
}
.biz-list li {
  counter-increment: biz;
  background: #fff; border-radius: 10px; padding: 14px 16px 14px 56px; position: relative;
  box-shadow: 0 2px 10px rgba(0,52,119,.06); font-size: 15px;
  transition: transform .2s, box-shadow .2s;
}
.biz-list li:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.biz-list li::before {
  content: counter(biz, decimal-leading-zero);
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  font-weight: 700; color: var(--accent); font-size: 18px; font-family: Georgia, serif;
}
.product-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; max-width: 900px; margin: 0 auto;
}
.product-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  color: #fff; text-align: center; padding: 34px 10px; border-radius: 12px;
  font-size: 18px; letter-spacing: 4px; box-shadow: var(--shadow);
  transition: transform .2s;
}
.product-card:hover { transform: translateY(-4px); }

/* ===== 主要业绩 ===== */
.ach-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ach-card {
  background: #fff; border-radius: 12px; padding: 28px 26px;
  box-shadow: 0 2px 12px rgba(0,52,119,.07);
  border-top: 3px solid var(--primary);
  transition: transform .2s, box-shadow .2s;
}
.ach-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-top-color: var(--accent); }
.ach-card h3 { font-size: 18px; color: var(--primary); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.ach-icon { color: var(--accent); font-size: 16px; }
.ach-card ul { list-style: none; }
.ach-card li {
  font-size: 13.5px; color: var(--muted); padding: 7px 0 7px 18px; position: relative;
  border-bottom: 1px dashed #e3ebf3;
}
.ach-card li:last-child { border-bottom: none; }
.ach-card li::before { content: "·"; position: absolute; left: 2px; color: var(--accent); font-weight: bold; }

/* ===== 案例展示 ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card {
  background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 12px rgba(0,52,119,.08);
  transition: transform .25s, box-shadow .25s;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case-card img { width: 100%; height: 220px; object-fit: cover; transition: transform .4s; }
.case-card:hover img { transform: scale(1.04); }
.case-card figcaption { padding: 16px 18px 18px; }
.case-card figcaption strong { display: block; font-size: 15px; color: var(--primary); line-height: 1.5; }
.case-card figcaption span { display: inline-block; margin-top: 10px; font-size: 12px; color: var(--accent); background: #fdeff0; padding: 3px 12px; border-radius: 20px; }

/* ===== 联系我们 ===== */
.contact { background: linear-gradient(135deg, var(--primary) 0%, #002a60 100%); color: #fff; }
.contact .section-en { color: #ffd7d9; }
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.contact-item {
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15);
  border-radius: 12px; padding: 32px 22px; text-align: center; transition: background .25s;
}
.contact-item:hover { background: rgba(255,255,255,.14); }
.contact-icon { font-size: 32px; margin-bottom: 12px; }
.contact-item h3 { font-size: 17px; margin-bottom: 8px; letter-spacing: 2px; }
.contact-item p { font-size: 14px; opacity: .88; }
.contact-item a:hover { text-decoration: underline; }

/* ===== 页脚 ===== */
.site-footer { background: #00204a; color: rgba(255,255,255,.75); padding: 30px 0; }
.footer-inner { text-align: center; }
.footer-motto { letter-spacing: 4px; color: rgba(255,255,255,.9); margin-bottom: 8px; font-size: 14px; }
.site-footer p { font-size: 13px; }

/* ===== 滚动显现 ===== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .header-contact { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .ach-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .biz-list { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav {
    position: fixed; top: 72px; left: 0; right: 0; background: #fff;
    flex-direction: column; padding: 12px 24px 20px; gap: 2px;
    box-shadow: 0 12px 24px rgba(0,52,119,.15);
    transform: translateY(-130%); transition: transform .3s;
  }
  .nav.open { transform: none; }
  .nav a { padding: 12px 8px; border-bottom: 1px solid #f0f4f8; }
  .nav-toggle {
    display: flex; flex-direction: column; gap: 5px; margin-left: auto;
    background: none; border: none; cursor: pointer; padding: 6px;
  }
  .nav-toggle span { width: 24px; height: 2.5px; background: var(--primary); border-radius: 2px; transition: transform .3s, opacity .3s; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
  .section { padding: 64px 0; }
  .ach-grid, .case-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { letter-spacing: 6px; }
  .hero-sub { letter-spacing: 8px; }
  .biz-list { gap: 10px; }
}