/* ============ 基础变量 ============ */
:root{
  --navy:#143a67;
  --navy-deep:#0f2d54;
  --blue:#1e5aa8;
  --orange:#e8833a;
  --orange-soft:#f4a259;
  --teal:#0f766e;
  --bg:#f5f8fc;
  --bg-alt:#eef3fa;
  --text:#1f2d3d;
  --muted:#5b6b7d;
  --border:#e3e9f2;
  --white:#fff;
  --shadow:0 10px 30px rgba(20,58,103,.10);
  --radius:16px;
  --maxw:1140px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans CN",system-ui,sans-serif;
  color:var(--text);
  background:var(--white);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ============ 导航 ============ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(255,255,255,.0);
  transition:background .3s, box-shadow .3s, padding .3s;
  padding:18px 0;
}
.nav.scrolled{
  background:rgba(255,255,255,.95);
  box-shadow:0 4px 20px rgba(20,58,103,.08);
  padding:10px 0;
}
.nav__inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between}
.nav__brand{display:flex;align-items:center;gap:10px;color:var(--white);transition:color .3s}
.nav.scrolled .nav__brand{color:var(--navy)}
.nav__logo{width:38px;height:38px;object-fit:contain}
.nav__brand-text{font-weight:700;font-size:18px;letter-spacing:.5px}
.nav__links{display:flex;gap:26px}
.nav__links a{color:rgba(255,255,255,.9);font-size:15px;font-weight:500;position:relative;padding:4px 0;transition:color .3s}
.nav.scrolled .nav__links a{color:var(--navy)}
.nav__links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--orange);transition:width .25s}
.nav__links a:hover{color:var(--orange)}
.nav__links a:hover::after{width:100%}

/* ============ 导航下拉（招标信息） ============ */
.nav__item--sub{position:relative}
.nav__item--sub .nav__item-link{display:inline-block}
.nav__caret{display:inline-block;width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;margin-left:5px;vertical-align:middle;opacity:.85;cursor:pointer}
.nav__sub{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);min-width:156px;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 12px 30px rgba(20,58,103,.16);padding:8px;display:none;flex-direction:column;z-index:60}
.nav__item--sub:hover .nav__sub{display:flex}
.nav__sub a{color:var(--navy)!important;font-size:14px;font-weight:500;padding:9px 14px;border-radius:8px;white-space:nowrap}
.nav__sub a:hover{background:var(--bg-alt);color:var(--orange)!important}
.nav__sub a::after{display:none}

.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__toggle span{width:24px;height:2px;background:#fff;transition:.3s}
.nav.scrolled .nav__toggle span{background:var(--navy)}

/* ============ Hero ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;overflow:hidden;text-align:center;color:#fff}
.hero__bg{
  position:absolute;inset:0;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(232,131,58,.35), transparent 60%),
    radial-gradient(900px 500px at 0% 110%, rgba(30,90,168,.55), transparent 60%),
    linear-gradient(135deg,var(--navy-deep),var(--navy) 55%,#1c4a82);
}
.hero__bg::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:46px 46px;mask-image:radial-gradient(circle at 50% 40%,#000,transparent 75%)
}
.hero__content{position:relative;z-index:2;padding:120px 24px 80px;max-width:820px}
.hero__logo{width:96px;height:96px;margin:0 auto 22px;filter:drop-shadow(0 6px 18px rgba(0,0,0,.25))}
.hero__title{font-size:clamp(28px,5vw,46px);font-weight:800;letter-spacing:1px;line-height:1.25}
.hero__subtitle{margin-top:14px;font-size:15px;letter-spacing:4px;color:var(--orange-soft);font-weight:600}
.hero__slogan{margin-top:18px;font-size:clamp(15px,2vw,18px);color:rgba(255,255,255,.85)}
.hero__scroll{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);width:26px;height:42px;border:2px solid rgba(255,255,255,.6);border-radius:14px;display:flex;justify-content:center;padding-top:8px}
.hero__scroll-dot{width:4px;height:8px;border-radius:3px;background:#fff;animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:0;transform:translateY(-4px)}40%{opacity:1}100%{opacity:0;transform:translateY(12px)}}

/* ============ 通用 section ============ */
.section{padding:84px 0}
.section--alt{background:var(--bg)}
.section__head{text-align:center;margin-bottom:42px}
.section__label{display:inline-block;font-size:13px;letter-spacing:3px;color:var(--orange);font-weight:700;margin-bottom:8px}
.section__title{font-size:clamp(24px,3.4vw,34px);font-weight:800;color:var(--navy);position:relative;padding-bottom:14px}
.section__title::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:54px;height:4px;border-radius:3px;background:linear-gradient(90deg,var(--orange),var(--orange-soft))}
.section__lead{text-align:center;color:var(--muted);max-width:720px;margin:-18px auto 36px;font-size:16px}

/* ============ 关于诚竣 ============ */
.about__intro{max-width:880px;margin:0 auto 40px;color:var(--muted);font-size:16px}
.about__intro p{margin-bottom:16px}
.about__intro strong{color:var(--navy)}
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin:8px 0 48px}
.stat{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px 14px;text-align:center;box-shadow:var(--shadow);transition:transform .25s}
.stat:hover{transform:translateY(-6px)}
.stat__num{font-size:34px;font-weight:800;color:var(--navy);line-height:1}
.stat__num span{font-size:16px;margin-left:2px;color:var(--orange)}
.stat__label{margin-top:10px;font-size:14px;color:var(--muted)}
.about__depts{text-align:center}
.block__title{font-size:20px;color:var(--navy);margin-bottom:18px;font-weight:700}
.chips{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:30px}
.chip{background:var(--bg-alt);border:1px solid var(--border);color:var(--navy);padding:8px 18px;border-radius:999px;font-size:15px;font-weight:600}
.org{max-width:760px;margin:0 auto;border:1px solid var(--border);border-radius:var(--radius);padding:18px;background:#fff;box-shadow:var(--shadow)}
.org img{margin:0 auto}

/* ============ 卡片 ============ */
.cards{display:grid;gap:22px}
.cards--3{grid-template-columns:repeat(3,1fr)}
.cards--4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:0 16px 38px rgba(20,58,103,.16)}
.card__icon{width:54px;height:54px;border-radius:14px;background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.card__icon svg{width:28px;height:28px}
.card__title{font-size:19px;color:var(--navy);margin-bottom:10px;font-weight:700}
.card__title--accent{color:var(--orange)}
.card__text{color:var(--muted);font-size:15px}

.biz{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);position:relative;overflow:hidden;transition:transform .25s,box-shadow .25s}
.biz:hover{transform:translateY(-6px);box-shadow:0 16px 38px rgba(20,58,103,.16)}
.biz__no{font-size:40px;font-weight:800;color:var(--bg-alt);position:absolute;top:14px;right:18px;line-height:1}
.biz__title{font-size:18px;color:var(--navy);font-weight:700;margin-bottom:10px;position:relative}
.biz__text{color:var(--muted);font-size:14.5px;position:relative}

/* ============ 企业备案 画廊 ============ */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.gallery__item{margin:0;background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);cursor:pointer;transition:transform .25s}
.gallery__item:hover{transform:translateY(-5px)}
.gallery__item img{width:100%;height:240px;object-fit:contain;background:#fafcff;padding:14px}
.gallery__item figcaption{padding:12px 16px;font-size:15px;font-weight:600;color:var(--navy);border-top:1px solid var(--border);text-align:center}

/* ============ 业绩 ============ */
.filters{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:30px}
.filter{background:var(--white);border:1px solid var(--border);color:var(--navy);padding:9px 22px;border-radius:999px;font-size:15px;font-weight:600;cursor:pointer;transition:.2s}
.filter:hover{border-color:var(--orange);color:var(--orange)}
.filter.active{background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;border-color:transparent}
.ach__group{margin-bottom:34px}
.ach__group-title{font-size:20px;color:var(--navy);font-weight:700;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.ach__group-title::before{content:"";width:6px;height:22px;border-radius:3px;background:linear-gradient(180deg,var(--orange),var(--orange-soft))}
.ach__table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.ach__table thead th{background:var(--navy);color:#fff;text-align:left;padding:14px 18px;font-size:14.5px;font-weight:600;letter-spacing:.5px}
.ach__table tbody td{padding:13px 18px;font-size:14.5px;border-top:1px solid var(--border);color:var(--text);vertical-align:top}
.ach__table tbody tr:nth-child(even){background:var(--bg-alt)}
.ach__table tbody tr:hover{background:#fff5ec}
.ach__idx{color:var(--orange);font-weight:700;width:48px}
.ach__hint{text-align:center;color:var(--muted);font-size:14px;margin-top:14px}
.ach__hint code{background:var(--bg-alt);padding:2px 8px;border-radius:6px;color:var(--navy);font-size:13px}

/* ============ 招标信息 ============ */
.tender__list{display:flex;flex-direction:column;gap:14px}
.tender__item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px 20px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.tender__item:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(20,58,103,.12)}
.tender__top{display:flex;justify-content:space-between;align-items:baseline;gap:14px;flex-wrap:wrap}
.tender__title{font-size:17px;color:var(--navy);font-weight:700;margin:0}
.tender__date{flex-shrink:0;font-size:13px;color:var(--muted)}
.tender__content{margin-top:8px;color:var(--muted);font-size:15px;white-space:pre-wrap;line-height:1.7}
.tender__empty{text-align:center;color:var(--muted);padding:30px 0}

/* ============ 联系我们 ============ */
.contact{display:grid;grid-template-columns:1.4fr .6fr;gap:36px;align-items:start;max-width:920px;margin:0 auto}
.contact__info{display:flex;flex-direction:column;gap:6px}
.contact__row{display:flex;gap:16px;align-items:flex-start;padding:16px 18px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow)}
.contact__ico{font-size:22px;line-height:1.4}
.contact__row b{color:var(--navy);font-size:15px}
.contact__row a{color:var(--blue);font-weight:600}
.contact__row a:hover{color:var(--orange)}
.contact__qr{text-align:center;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.contact__qr img{width:180px;height:180px;margin:0 auto 12px;object-fit:contain}
.contact__qr p{color:var(--muted);font-size:14px}

/* ============ 页脚 ============ */
.footer{background:var(--navy-deep);color:rgba(255,255,255,.8);padding:34px 0}
.footer__inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px}
.footer__brand{display:flex;align-items:center;gap:10px;font-weight:600;color:#fff}
.footer__logo{width:34px;height:34px}
.footer__copy{font-size:13.5px}

/* ============ 灯箱 ============ */
.lightbox{position:fixed;inset:0;background:rgba(10,20,35,.92);display:none;align-items:center;justify-content:center;z-index:100;padding:30px}
.lightbox.open{display:flex}
.lightbox img{max-width:92%;max-height:88%;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox__close{position:absolute;top:22px;right:28px;background:none;border:0;color:#fff;font-size:38px;line-height:1;cursor:pointer}

/* ============ 滚动揭示动画 ============ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.show{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:980px){
  .stats{grid-template-columns:repeat(3,1fr)}
  .cards--4{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .contact{grid-template-columns:1fr}
  .contact__qr{max-width:320px;margin:0 auto}
}
@media (max-width:680px){
  .nav__links{position:fixed;top:62px;right:0;background:#fff;flex-direction:column;width:200px;padding:18px 22px;gap:6px;box-shadow:0 12px 30px rgba(20,58,103,.16);transform:translateX(120%);transition:transform .3s;border-radius:0 0 0 14px}
  .nav__links.open{transform:none}
  .nav__links a{color:var(--navy)!important}
  .nav__item--sub .nav__caret{display:none}
  .nav__item--sub .nav__sub{position:static;transform:none;display:flex;box-shadow:none;border:0;padding:2px 0 2px 14px;min-width:0}
  .nav__item--sub .nav__sub a{padding:8px 12px;font-size:14px;background:none}
  .nav__toggle{display:flex}
  .cards--3,.cards--4,.gallery{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .section{padding:60px 0}
  .ach__table thead{display:none}
  .ach__table,.ach__table tbody,.ach__table tr,.ach__table td{display:block;width:100%}
  .ach__table tr{margin-bottom:12px;border:1px solid var(--border);border-radius:12px;overflow:hidden}
  .ach__table td{border-top:0;padding:10px 16px}
  .ach__table td.ach__idx{background:var(--navy);color:#fff;width:auto}
}