/* =========================================================
   核西南院 · 工程智能创新中心 门户网站  —  设计系统 v3
   参考 cbim.com.cn / 中设集团风格，国企科技蓝
   新增：轮播Carousel、详情Modal、导航优化
   ========================================================= */
:root{
  --c-navy:#0A1F44;        /* 深海军蓝：页脚/深色块 */
  --c-navy-2:#0E2A5C;
  --c-blue:#0A4DA6;        /* 企业蓝（主色） */
  --c-blue-500:#1A6FD0;
  --c-blue-300:#7FB6EC;
  --c-cyan:#16B8C4;        /* 科技青 */
  --c-teal:#00A29A;        /* 应急/城市 */
  --c-green:#2FA84F;       /* 双碳 */
  --c-amber:#F5A623;       /* 强调 */
  --c-bg:#F4F6FA;          /* 浅灰底 */
  --c-white:#FFFFFF;
  --c-ink:#16213A;         /* 正文 */
  --c-ink-2:#5A6678;       /* 次级文字 */
  --c-line:#E4E9F2;        /* 描边 */

  --container:1200px;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 10px 30px rgba(16,42,92,.08);
  --shadow-hover:0 18px 44px rgba(10,77,166,.18);
  --font: "Microsoft YaHei","PingFang SC","Source Han Sans SC","Hiragino Sans GB","思源黑体",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--c-ink);background:var(--c-white);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:70px 0}
.section--compact{padding:36px 0 60px}
.section--gray{background:var(--c-bg)}
.section--navy{background:var(--c-navy);color:#fff}

/* ---------- 区块标题 ---------- */
.eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--c-blue);font-weight:700;margin-bottom:12px;position:relative;padding-left:0}
.eyebrow::before{content:"";display:inline-block;width:22px;height:3px;background:var(--c-blue);vertical-align:middle;margin-right:10px;border-radius:2px}
.section-title{font-size:30px;font-weight:800;color:var(--c-ink);letter-spacing:.5px}
.section-title .accent{color:var(--c-blue)}
.section-head{margin-bottom:42px;max-width:760px}
.section-head p{color:var(--c-ink-2);margin-top:12px;font-size:15px}
.section--navy .section-title,.section--navy .section-head p{color:#fff}
.section--navy .eyebrow{color:var(--c-cyan)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:999px;font-weight:700;font-size:15px;transition:.25s;cursor:pointer;border:1px solid transparent}
.btn--primary{background:var(--c-blue);color:#fff}
.btn--primary:hover{background:var(--c-blue-500);box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn--ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn--line{background:#fff;color:var(--c-blue);border-color:var(--c-line)}
.btn--line:hover{border-color:var(--c-blue);box-shadow:var(--shadow)}

/* ========== 顶部导航 v3（防拥挤） ========== */
.site-header{position:sticky;top:0;z-index:999;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--c-line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px;gap:20px}
.nav__logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.nav__logo img{height:40px;width:auto;object-fit:contain}
/* 隐藏文字logo，只保留图片（新logo自带完整文字） */
.nav__logo .logo-text{display:none}
/* 导航菜单：紧凑但不重叠 */
.nav__menu{display:flex;gap:2px;flex:1;justify-content:center}
.nav__menu a{padding:10px 15px;font-size:14.5px;font-weight:600;color:var(--c-ink);border-radius:8px;position:relative;transition:.2s;white-space:nowrap}
.nav__menu a:hover{color:var(--c-blue);background:rgba(10,77,166,.05)}
.nav__menu a.active{color:var(--c-blue)}
.nav__menu a.active::after{content:"";position:absolute;left:16px;right:16px;bottom:3px;height:3px;background:var(--c-blue);border-radius:2px}
.nav__cta{display:flex;align-items:center;gap:10px;flex-shrink:0}
.nav__toggle{display:none;font-size:24px;background:none;border:none;cursor:pointer;color:var(--c-ink);padding:6px}

/* ---------- Hero 轮播 Carousel ---------- */
.hero-carousel{position:relative;width:100%;overflow:hidden;height:520px;background:var(--c-navy)}
.carousel__track{display:flex;transition:transform .7s cubic-bezier(.4,0,.2,1);height:100%}
.carousel__slide{min-width:100%;position:relative;display:flex;align-items:center;color:#fff;overflow:hidden}
.carousel__slide-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.04);transition:transform 8s linear}
.carousel__slide.active .carousel__slide-bg{transform:scale(1.08)}
.carousel__slide-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,31,68,.94) 0%,rgba(10,31,68,.75) 45%,rgba(10,31,68,.35) 75%,rgba(10,31,68,.12) 100%)}
.carousel__slide-inner{position:relative;z-index:2;max-width:640px;padding:0 60px}
.carousel__tag{display:inline-block;padding:6px 18px;border:1px solid rgba(255,255,255,.35);border-radius:999px;font-size:13px;letter-spacing:1.5px;margin-bottom:20px}
.carousel__slide h2{font-size:38px;line-height:1.3;font-weight:800;letter-spacing:1px;margin-bottom:16px;word-break:keep-all}
.carousel__slide h2 .hl{color:var(--c-cyan)}
.carousel__slide p{font-size:17px;margin:18px 0 28px;color:rgba(255,255,255,.88);max-width:520px;line-height:1.7}
.carousel__btns{display:flex;gap:14px;flex-wrap:wrap}

/* 轮播指示器 & 控制按钮 */
.carousel__dots{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:5;display:flex;gap:10px}
.carousel__dot{width:36px;height:4px;border-radius:2px;background:rgba(255,255,255,.35);cursor:pointer;transition:.3s;border:none}
.carousel__dot.active{background:#fff;width:48px}
.carousel__arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);color:#fff;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.25s;backdrop-filter:blur(4px)}
.carousel__arrow:hover{background:rgba(255,255,255,.3)}
.carousel__arrow.prev{left:24px}
.carousel__arrow.next{right:24px}
/* 自动播放暂停恢复 */
.hero-carousel:hover .carousel__slide-bg{animation-play-state:paused!important}
.hero--inner{min-height:180px;position:relative;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero--inner .hero__bg{position:absolute;inset:0;background-size:cover;background-position:center}
.hero--inner .hero__overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,31,68,.75),rgba(10,77,166,.6))}
.hero--inner .hero__inner{position:relative;z-index:1}
.hero--inner h1{font-size:34px;font-weight:800;text-shadow:0 2px 12px rgba(0,0,0,.3)}
.hero--inner p{font-size:15px;opacity:.9;margin-top:8px;max-width:600px}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:26px}
.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:#fff;border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;transition:.28s;display:flex;flex-direction:column;cursor:pointer}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.card__img{height:192px;background-size:cover;background-position:center;position:relative}
.card__img .tag{position:absolute;top:14px;left:14px;background:rgba(10,31,68,.78);color:#fff;font-size:12px;padding:4px 12px;border-radius:999px;font-weight:600}
.card__body{padding:22px;flex:1;display:flex;flex-direction:column}
.card__body h3{font-size:18px;font-weight:800;margin-bottom:10px}
.card__body p{color:var(--c-ink-2);font-size:14px;flex:1}
.card__more{margin-top:16px;color:var(--c-blue);font-weight:700;font-size:14px;display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.card__more:hover{gap:10px}

/* 能力方块（首页八宫格） */
.cap{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:26px;transition:.25s;position:relative;overflow:hidden}
.cap::before{content:"";position:absolute;left:0;top:0;width:4px;height:100%;background:var(--c-blue);opacity:.85}
.cap:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.cap .cap__icon{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,var(--c-blue),var(--c-cyan));display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;font-weight:800;margin-bottom:16px}
.cap h3{font-size:17px;font-weight:800;margin-bottom:8px}
.cap p{color:var(--c-ink-2);font-size:13.5px}
.cap--teal::before{background:var(--c-teal)}
.cap--green::before{background:var(--c-green)}
.cap--amber::before{background:var(--c-amber)}

/* ---------- 数据亮点 ---------- */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:24px;text-align:center}
.stat .num{font-size:40px;font-weight:800;color:#fff}
.stat .num span{color:var(--c-cyan)}
.stat .label{color:rgba(255,255,255,.8);font-size:14px;margin-top:6px}
/* 浅色背景上的 stats 变体（关于我们页等） */
.section--gray .stat .num{color:var(--c-navy)}
.section--gray .stat .num span{color:var(--c-primary)}
.section--gray .stat .label{color:var(--c-ink-2)}

/* ---------- Tabs / 筛选 ---------- */
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:36px}
.tabs button{padding:9px 22px;border:1px solid var(--c-line);background:#fff;border-radius:999px;font-size:14px;font-weight:600;color:var(--c-ink-2);cursor:pointer;transition:.2s}
.tabs button:hover{border-color:var(--c-blue);color:var(--c-blue)}
.tabs button.active{background:var(--c-blue);color:#fff;border-color:var(--c-blue)}

/* ---------- 时间轴 ---------- */
.timeline{position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:var(--c-line)}
.tl-item{position:relative;padding-bottom:30px}
.tl-item::before{content:"";position:absolute;left:-27px;top:5px;width:16px;height:16px;border-radius:50%;background:var(--c-blue);border:3px solid #fff;box-shadow:0 0 0 2px var(--c-blue)}
.tl-item .year{font-weight:800;color:var(--c-blue);font-size:16px}
.tl-item h4{font-size:16px;font-weight:700;margin:4px 0 6px}
.tl-item p{color:var(--c-ink-2);font-size:14px}

/* ---------- 流程步骤 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:26px;position:relative}
.step .n{counter-increment:step;font-size:30px;font-weight:800;color:var(--c-blue-300)}
.step .n::before{content:"0" counter(step)}
.step h4{font-size:16px;font-weight:800;margin:10px 0 6px}
.step p{font-size:13.5px;color:var(--c-ink-2)}

/* ---------- 列表/特性 ---------- */
.feature-list{display:grid;gap:14px}
.feature-list li{display:flex;gap:12px;align-items:flex-start;font-size:15px}
.feature-list li .dot{flex:none;width:8px;height:8px;border-radius:50%;background:var(--c-blue);margin-top:9px}
.kv{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 32px}
.kv div{border-bottom:1px dashed var(--c-line);padding:12px 0}
.kv div b{color:var(--c-blue)}

/* ---------- 两栏图文 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.split__media{height:380px;border-radius:var(--radius);background-size:cover;background-position:center;box-shadow:var(--shadow)}
.split h2{font-size:28px;font-weight:800;margin-bottom:18px}
.split p{color:var(--c-ink-2);margin-bottom:14px;line-height:1.7}

/* ========== 详情弹窗 Modal ========== */
.modal-overlay{display:none;position:fixed;inset:0;z-index:10000;background:rgba(10,31,68,.62);backdrop-filter:blur(6px);opacity:0;transition:opacity .3s;align-items:flex-start;justify-content:center;padding:40px 20px;overflow-y:auto}
.modal-overlay.show{display:flex;opacity:1}
.modal{background:#fff;border-radius:var(--radius);max-width:880px;width:100%;box-shadow:0 30px 80px rgba(0,0,0,.28);position:relative;overflow:hidden;animation:modalIn .35s ease-out}
@keyframes modalIn{from{opacity:0;transform:translateY(30px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
.modal__hero{height:320px;background-size:cover;background-position:center;position:relative}
.modal__hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,31,68,.15) 0%,rgba(10,31,68,.05) 40%,rgba(10,31,68,.92) 100%)}
.modal__hero-tag{position:absolute;top:22px;left:28px;z-index:3;background:rgba(255,255,255,.92);color:var(--c-blue);font-size:13px;padding:6px 16px;border-radius:999px;font-weight:700}
.modal__hero-title{position:absolute;z-index:3;left:28px;right:28px;bottom:24px;color:#fff}
.modal__hero-title h2{font-size:30px;font-weight:800;line-height:1.25;text-shadow:0 2px 12px rgba(0,0,0,.35)}
.modal__header-bar{display:flex;align-items:center;justify-content:flex-end;gap:10px;padding:12px 16px 0;position:relative;z-index:10}
.modal__top-actions{display:flex;gap:8px}
.modal__top-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 16px;border-radius:999px;font-size:13px;font-weight:700;cursor:pointer;border:none;transition:.22s;white-space:nowrap}
.modal__top-btn--dl{background:var(--c-blue);color:#fff}
.modal__top-btn--dl:hover{background:var(--c-blue-500);transform:translateY(-1px);box-shadow:0 4px 14px rgba(10,77,166,.2)}
.modal__top-btn--share{background:#fff;color:var(--c-ink-2);border:1px solid var(--c-line)}
.modal__top-btn--share:hover{border-color:var(--c-blue);color:var(--c-blue);box-shadow:0 4px 14px rgba(10,77,166,.1)}
.modal__close{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.92);border:none;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--c-ink);transition:.2s;flex-shrink:0}
.modal__close:hover{background:#fff;box-shadow:var(--shadow);transform:rotate(90deg)}
.modal__body{padding:34px 40px 40px}
.modal__body .modal__desc{font-size:15.5px;color:var(--c-ink-2);margin-bottom:28px;line-height:1.8;padding-bottom:24px;border-bottom:1px solid var(--c-line)}
.modal__sect{margin-bottom:26px}
.modal__sect h4{font-size:16px;font-weight:800;color:var(--c-blue);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.modal__sect h4::before{content:"";width:4px;height:18px;background:var(--c-blue);border-radius:2px}
.modal__feat{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.modal__feat span{display:flex;gap:10px;font-size:14.5px;color:var(--c-ink);align-items:flex-start;padding:10px 14px;background:var(--c-bg);border-radius:10px;line-height:1.5}
.modal__feat span i{flex:none;color:var(--c-cyan);font-weight:900;font-style:normal;font-size:13px;margin-top:3px}
.modal__gallery{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}
.modal__gallery img{height:180px;border-radius:var(--radius-sm);object-fit:cover;width:100%}
.modal__action{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap;padding-top:24px;border-top:1px solid var(--c-line)}

/* ---------- 弹窗分享/下载按钮组 ---------- */
.modal__share-bar{display:flex;gap:10px;margin-top:8px;flex-wrap:wrap}
.modal__share-btn{display:inline-flex;align-items:center;gap:7px;padding:9px 18px;border-radius:999px;font-size:13px;font-weight:700;cursor:pointer;border:1px solid var(--c-line);background:#fff;color:var(--c-ink-2);transition:.22s}
.modal__share-btn:hover{border-color:var(--c-blue);color:var(--c-blue);transform:translateY(-1px);box-shadow:0 4px 14px rgba(10,77,166,.12)}
.modal__share-btn--wechat{border-color:#07C160;color:#07C160;background:rgba(7,193,96,.04)}
.modal__share-btn--wechat:hover{background:rgba(7,193,96,.08);border-color:#07C160}
.modal__share-btn--download{border-color:var(--c-blue);color:#fff;background:var(--c-blue)}
.modal__share-btn--download:hover{background:var(--c-blue-500)}
/* 分享提示浮层 */
.share-toast{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(.9);z-index:11000;background:#fff;border-radius:16px;padding:36px 44px;text-align:center;box-shadow:0 24px 64px rgba(0,0,0,.25);opacity:0;pointer-events:none;transition:.3s}
.share-toast.show{opacity:1;transform:translate(-50%,-50%) scale(1);pointer-events:auto}
.share-toast h3{font-size:20px;font-weight:800;margin-bottom:12px}
.share-toast p{font-size:14px;color:var(--c-ink-2);margin-bottom:20px;line-height:1.7}
.share-qrcode{width:180px;height:180px;background:var(--c-bg);border-radius:12px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:13px;color:var(--c-ink-2)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--c-navy);color:#fff;padding:60px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.footer-grid h5{font-size:15px;font-weight:800;margin-bottom:18px;color:#fff}
.footer-grid a{display:block;color:rgba(255,255,255,.7);font-size:14px;padding:6px 0;transition:.2s}
.footer-grid a:hover{color:var(--c-cyan)}
.footer-brand img{height:42px;margin-bottom:16px;object-fit:contain}
.footer-brand p{color:rgba(255,255,255,.7);font-size:14px;max-width:340px;line-height:1.7}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:rgba(255,255,255,.55);font-size:13px}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(3,1fr);gap:30px 16px}
  .steps{grid-template-columns:repeat(2,1fr)}
  .carousel__slide h2{font-size:34px}
  .carousel__slide-inner{padding:0 40px;max-width:540px}
  .nav__menu a{padding:10px 11px;font-size:13.5px}
}
@media(max-width:760px){
  .nav__menu{position:fixed;top:70px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 24px;box-shadow:var(--shadow);display:none;border-bottom:1px solid var(--c-line);gap:0}
  .nav__menu.open{display:flex}
  .nav__menu a{padding:13px 0;font-size:16px}
  .nav__toggle{display:block}
  .nav__cta .btn--line{display:none}
  .carousel__slide h2{font-size:28px}
  .carousel__slide-inner{padding:0 24px;max-width:100%}
  .carousel__arrow{width:38px;height:38px;font-size:16px}
  .carousel__arrow.prev{left:10px}
  .carousel__arrow.next{right:10px}
  .hero-carousel{height:420px}
  .hero--inner{min-height:280px}
  .section{padding:56px 0}
  .grid--3,.grid--4,.grid--2{grid-template-columns:1fr}
  .split{grid-template-columns:1fr;gap:30px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .section-title{font-size:24px}
  .modal{max-width:100%;margin:0}
  .modal__body{padding:24px 20px}
  .modal__hero{height:200px}
  .modal__gallery{grid-template-columns:1fr}
  .modal__feat{grid-template-columns:1fr}
}