/* ===== 基础变量 ===== */
:root{
    --navy-900:#0a1f44;
    --navy-800:#102a5c;
    --navy-700:#163680;
    --navy-600:#1d4298;
    --blue-500:#2b6fd6;
    --blue-400:#5b9bf0;
    --gold-500:#c9a35a;
    --gold-400:#dcc07f;
    --gold-300:#ebd9a8;
    --ink-900:#1a1f2e;
    --ink-700:#3a4152;
    --ink-500:#5b6477;
    --ink-300:#9aa3b5;
    --ink-100:#eef1f6;
    --bg-alt:#f5f7fb;
    --white:#ffffff;
    --shadow-sm:0 2px 8px rgba(16,42,92,.06);
    --shadow-md:0 8px 30px rgba(16,42,92,.10);
    --shadow-lg:0 20px 50px rgba(10,31,68,.16);
    --radius:6px;
    --radius-lg:14px;
    --container:1200px;
    --t:.35s cubic-bezier(.4,0,.2,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{
    font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans CN",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
    color:var(--ink-700);
    background:var(--white);
    line-height:1.75;
    font-size:15px;
    -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%}

.container{max-width:var(--container);margin:0 auto;padding:0 24px}

/* ===== 顶部公告条 ===== */
.topbar{
    background:var(--navy-900);
    color:rgba(255,255,255,.78);
    font-size:12.5px;
    padding:8px 0;
    border-bottom:1px solid rgba(255,255,255,.06);
}
.topbar-inner{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.topbar-divider{width:1px;height:12px;background:rgba(255,255,255,.18)}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:16px}
.topbar-right a{color:rgba(255,255,255,.82);transition:color var(--t)}
.topbar-right a:hover{color:var(--gold-400)}
.topbar-btn{
    background:var(--gold-500);color:var(--navy-900)!important;
    padding:5px 14px;border-radius:3px;font-weight:600;
}
.topbar-btn:hover{background:var(--gold-400)}

/* ===== 导航 ===== */
.navbar{
    position:sticky;top:0;z-index:1000;
    background:rgba(255,255,255,.96);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--ink-100);
    transition:box-shadow var(--t),padding var(--t);
}
.navbar.scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:12px;color:var(--navy-800)}
.logo-mark{color:var(--gold-500);display:flex}
.logo-text{display:flex;flex-direction:column;line-height:1.1}
.logo-text strong{font-size:19px;color:var(--navy-900);letter-spacing:.5px;font-weight:700}
.logo-text small{font-size:9.5px;color:var(--ink-500);letter-spacing:1.5px;margin-top:2px}
.nav-menu{display:flex;align-items:center;gap:6px}
.nav-link{
    padding:8px 14px;font-size:14.5px;color:var(--ink-700);
    border-radius:3px;position:relative;transition:color var(--t);
    font-weight:500;
}
.nav-link::after{
    content:"";position:absolute;left:50%;bottom:2px;transform:translateX(-50%);
    width:0;height:2px;background:var(--gold-500);transition:width var(--t);
}
.nav-link:hover{color:var(--navy-800)}
.nav-link.active{color:var(--navy-900);font-weight:600}
.nav-link.active::after{width:20px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--navy-800);transition:var(--t)}

/* ===== Hero ===== */
.hero{
    position:relative;
    background:
      linear-gradient(135deg,rgba(10,31,68,.96) 0%,rgba(22,54,128,.92) 60%,rgba(29,66,152,.88) 100%),
      radial-gradient(circle at 20% 30%,rgba(201,163,90,.18),transparent 50%),
      radial-gradient(circle at 80% 70%,rgba(43,111,214,.25),transparent 50%);
    color:#fff;
    padding:90px 0 130px;
    overflow:hidden;
}
.hero::before{
    content:"";position:absolute;inset:0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
        linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
    background-size:50px 50px;
    mask-image:radial-gradient(circle at center,#000 0%,transparent 70%);
}
.hero-inner{position:relative;z-index:2;max-width:880px}
.hero-eyebrow{
    display:inline-block;font-size:12.5px;letter-spacing:2px;
    color:var(--gold-300);border:1px solid rgba(201,163,90,.4);
    padding:6px 16px;border-radius:30px;margin-bottom:24px;
    background:rgba(201,163,90,.08);
}
.hero-title{
    font-size:46px;line-height:1.3;font-weight:700;
    color:#fff;letter-spacing:1px;margin-bottom:24px;
}
.hero-title .accent{
    background:linear-gradient(90deg,var(--gold-300),var(--gold-500));
    -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-desc{
    font-size:16px;color:rgba(255,255,255,.82);
    max-width:760px;margin-bottom:36px;line-height:1.9;
}
.hero-actions{display:flex;gap:16px;margin-bottom:60px;flex-wrap:wrap}
.btn{
    display:inline-flex;align-items:center;justify-content:center;
    padding:13px 30px;border-radius:4px;font-size:15px;font-weight:600;
    cursor:pointer;border:none;transition:all var(--t);letter-spacing:.5px;
}
.btn-primary{background:var(--gold-500);color:var(--navy-900)}
.btn-primary:hover{background:var(--gold-400);transform:translateY(-2px);box-shadow:0 10px 24px rgba(201,163,90,.35)}
.btn-ghost{
    background:transparent;color:#fff;border:1px solid rgba(255,255,255,.4);
}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn-block{width:100%}

.hero-stats{display:flex;gap:50px;flex-wrap:wrap}
.stat{position:relative}
.stat-num{
    display:inline-block;font-size:42px;font-weight:700;
    color:var(--gold-300);line-height:1;font-family:" DIN Alternate","Helvetica Neue",sans-serif;
}
.stat-plus{color:var(--gold-300);font-size:20px;font-weight:600;margin-left:2px}
.stat-label{font-size:13px;color:rgba(255,255,255,.7);margin-top:6px;letter-spacing:.5px}
.stat:not(:last-child)::after{
    content:"";position:absolute;right:-25px;top:8px;
    width:1px;height:36px;background:rgba(255,255,255,.15);
}
.hero-wave{position:absolute;bottom:-1px;left:0;right:0;line-height:0;z-index:1}
.hero-wave svg{width:100%;height:60px}

/* ===== 通用 Section ===== */
.section{padding:90px 0;position:relative}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:720px;margin:0 auto 60px}
.section-eyebrow{
    display:block;font-size:12px;letter-spacing:3px;
    color:var(--gold-500);font-weight:600;margin-bottom:14px;
}
.section-title{
    font-size:34px;color:var(--navy-900);font-weight:700;
    letter-spacing:1px;margin-bottom:14px;
    position:relative;display:inline-block;
}
.section-title::after{
    content:"";display:block;width:50px;height:3px;
    background:linear-gradient(90deg,var(--gold-500),var(--gold-300));
    margin:14px auto 0;border-radius:2px;
}
.section-subtitle{font-size:15px;color:var(--ink-500);line-height:1.8}

/* ===== 平台介绍 ===== */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.about-text p{margin-bottom:18px;color:var(--ink-700);font-size:15.5px;line-height:1.95}
.about-text strong{color:var(--navy-800)}
.about-list{margin-top:24px;display:grid;gap:12px}
.about-list li{display:flex;align-items:center;gap:12px;font-size:14.5px;color:var(--ink-700)}
.check{
    width:22px;height:22px;border-radius:50%;background:var(--navy-800);
    color:#fff;display:inline-flex;align-items:center;justify-content:center;
    font-size:12px;flex-shrink:0;
}
.about-card{
    background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);
    overflow:hidden;border:1px solid var(--ink-100);
}
.about-card-head{
    background:var(--navy-900);padding:14px 20px;
    display:flex;align-items:center;gap:8px;
}
.about-card-head .dot{width:11px;height:11px;border-radius:50%}
.dot-red{background:#ff5f57}.dot-yellow{background:#febc2e}.dot-green{background:#28c840}
.about-card-title{margin-left:auto;color:rgba(255,255,255,.85);font-size:13px;letter-spacing:.5px}
.about-card-body{padding:24px}
.mini-chart{display:flex;align-items:flex-end;gap:10px;height:120px;margin-bottom:20px;padding:0 4px}
.mini-chart .bar{
    flex:1;background:linear-gradient(180deg,var(--blue-400),var(--navy-700));
    border-radius:4px 4px 0 0;transition:height var(--t);
    position:relative;
}
.mini-chart .bar:nth-child(odd){background:linear-gradient(180deg,var(--gold-400),var(--gold-500))}
.about-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;border-top:1px solid var(--ink-100);padding-top:20px}
.metric{display:flex;flex-direction:column;gap:4px}
.metric-label{font-size:12px;color:var(--ink-500)}
.metric-val{font-size:20px;font-weight:700;color:var(--navy-900)}
.metric-val.warn{color:#e8743b}
.metric-val.ok{color:#2ba471}

/* ===== 解决方案 Tab ===== */
.solutions-tabs{
    display:flex;justify-content:center;gap:8px;margin-bottom:48px;
    flex-wrap:wrap;border-bottom:1px solid var(--ink-100);padding-bottom:0;
}
.sol-tab{
    background:none;border:none;cursor:pointer;
    padding:14px 26px;font-size:15px;font-weight:600;
    color:var(--ink-500);position:relative;transition:color var(--t);
    font-family:inherit;
}
.sol-tab::after{
    content:"";position:absolute;left:50%;bottom:-1px;transform:translateX(-50%);
    width:0;height:3px;background:var(--gold-500);transition:width var(--t);
}
.sol-tab:hover{color:var(--navy-800)}
.sol-tab.active{color:var(--navy-900)}
.sol-tab.active::after{width:60%}

.sol-panel{display:none;animation:fadeIn .5s ease}
.sol-panel.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

.sol-panel-intro{text-align:center;max-width:760px;margin:0 auto 48px}
.sol-panel-intro h3{
    font-size:24px;color:var(--navy-900);font-weight:700;margin-bottom:14px;letter-spacing:.5px;
}
.sol-panel-intro p{color:var(--ink-500);font-size:15px;line-height:1.85}

/* 舆情监测卡片 */
.sol-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.sol-card{
    background:#fff;border:1px solid var(--ink-100);border-radius:var(--radius-lg);
    padding:36px 30px;transition:all var(--t);position:relative;overflow:hidden;
}
.sol-card::before{
    content:"";position:absolute;top:0;left:0;width:100%;height:3px;
    background:linear-gradient(90deg,var(--navy-800),var(--gold-500));
    transform:scaleX(0);transform-origin:left;transition:transform var(--t);
}
.sol-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent}
.sol-card:hover::before{transform:scaleX(1)}
.sol-icon{
    width:60px;height:60px;border-radius:12px;
    background:linear-gradient(135deg,var(--navy-800),var(--navy-600));
    color:var(--gold-300);display:flex;align-items:center;justify-content:center;
    margin-bottom:22px;
}
.sol-card h4{font-size:19px;color:var(--navy-900);margin-bottom:14px;font-weight:700}
.sol-card p{color:var(--ink-500);font-size:14px;line-height:1.85;margin-bottom:20px}
.sol-tags{display:flex;flex-wrap:wrap;gap:8px}
.sol-tags li{
    font-size:12px;color:var(--navy-700);background:var(--ink-100);
    padding:5px 12px;border-radius:30px;
}

/* 舆情预警 */
.warning-features{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.warn-feature{
    background:#fff;border-radius:var(--radius-lg);padding:38px 30px;
    border:1px solid var(--ink-100);transition:all var(--t);
}
.warn-feature:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent}
.warn-icon{
    width:64px;height:64px;border-radius:50%;
    background:linear-gradient(135deg,rgba(201,163,90,.15),rgba(43,111,214,.1));
    display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:20px;
}
.warn-feature h4{font-size:19px;color:var(--navy-900);margin-bottom:14px;font-weight:700}
.warn-feature p{color:var(--ink-500);font-size:14px;line-height:1.85}
.channels{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.channels span{
    font-size:12px;padding:5px 12px;border-radius:4px;
    background:var(--navy-900);color:#fff;font-weight:500;
}

/* 舆情分析 */
.analysis-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.analysis-item{
    background:#fff;border-radius:var(--radius-lg);padding:32px 28px;
    border:1px solid var(--ink-100);transition:all var(--t);position:relative;
    border-left:3px solid var(--gold-500);
}
.analysis-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.analysis-item-wide{grid-column:span 3;background:linear-gradient(135deg,var(--navy-900),var(--navy-700));color:#fff;border-left-color:var(--gold-500)}
.analysis-item-wide h4,.analysis-item-wide p{color:#fff}
.analysis-item-wide .analysis-num{color:var(--gold-300)}
.analysis-num{
    font-size:14px;font-weight:700;color:var(--gold-500);letter-spacing:2px;
    margin-bottom:14px;display:block;
}
.analysis-item h4{font-size:18px;color:var(--navy-900);margin-bottom:12px;font-weight:700}
.analysis-item p{color:var(--ink-500);font-size:13.5px;line-height:1.8}

/* 舆情报告 */
.report-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.report-card{
    background:#fff;border-radius:var(--radius-lg);padding:38px 32px;
    border:1px solid var(--ink-100);transition:all var(--t);position:relative;
}
.report-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.report-card-highlight{
    background:linear-gradient(135deg,var(--navy-900) 0%,var(--navy-700) 100%);
    color:#fff;border-color:transparent;
}
.report-card-highlight h4{color:#fff}
.report-card-highlight p{color:rgba(255,255,255,.78)}
.report-badge{
    display:inline-block;font-size:11px;font-weight:700;letter-spacing:2px;
    padding:5px 14px;border-radius:30px;
    background:rgba(201,163,90,.15);color:var(--gold-500);
    margin-bottom:18px;
}
.report-card-highlight .report-badge{background:rgba(220,192,127,.2);color:var(--gold-300)}
.report-card h4{font-size:22px;color:var(--navy-900);margin-bottom:14px;font-weight:700}
.report-card p{color:var(--ink-500);font-size:14px;line-height:1.85}

/* ===== 行业覆盖 ===== */
.industries-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.industry{
    background:#fff;border:1px solid var(--ink-100);border-radius:var(--radius-lg);
    padding:34px 20px;display:flex;flex-direction:column;align-items:center;gap:14px;
    transition:all var(--t);cursor:default;
}
.industry:hover{
    transform:translateY(-6px);box-shadow:var(--shadow-md);
    background:linear-gradient(135deg,var(--navy-900),var(--navy-700));color:#fff;
    border-color:transparent;
}
.ind-icon{font-size:36px;line-height:1}
.industry span:last-child{font-size:16px;font-weight:600;color:var(--navy-900);letter-spacing:.5px}
.industry:hover span:last-child{color:#fff}

/* ===== 服务优势 ===== */
.advantages-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.advantage{
    background:#fff;border-radius:var(--radius-lg);padding:38px 32px;
    border:1px solid var(--ink-100);transition:all var(--t);
}
.advantage:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent}
.adv-icon{
    width:60px;height:60px;border-radius:12px;
    background:linear-gradient(135deg,var(--navy-800),var(--blue-500));
    color:var(--gold-300);display:flex;align-items:center;justify-content:center;margin-bottom:22px;
}
.advantage h4{font-size:19px;color:var(--navy-900);margin-bottom:12px;font-weight:700}
.advantage p{color:var(--ink-500);font-size:14px;line-height:1.85}

/* ===== CTA ===== */
.cta-band{
    background:
      linear-gradient(135deg,var(--navy-900),var(--navy-700)),
      radial-gradient(circle at 20% 50%,rgba(201,163,90,.2),transparent 50%);
    color:#fff;padding:60px 0;
}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-text h3{font-size:26px;font-weight:700;margin-bottom:8px;letter-spacing:.5px}
.cta-text p{color:rgba(255,255,255,.78);font-size:15px}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:50px}
.contact-info{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.contact-item{
    background:var(--bg-alt);border-radius:var(--radius-lg);padding:28px 24px;
    border-left:3px solid var(--gold-500);transition:all var(--t);
}
.contact-item:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px)}
.ci-label{font-size:12px;color:var(--ink-500);letter-spacing:1px;margin-bottom:8px;text-transform:uppercase}
.ci-value{font-size:18px;font-weight:700;color:var(--navy-900);margin-bottom:6px;word-break:break-all}
.ci-sub{font-size:12.5px;color:var(--ink-500)}

.contact-form{
    background:#fff;border:1px solid var(--ink-100);border-radius:var(--radius-lg);
    padding:36px 32px;box-shadow:var(--shadow-sm);
}
.contact-form h4{font-size:20px;color:var(--navy-900);margin-bottom:22px;font-weight:700}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.contact-form input,
.contact-form select,
.contact-form textarea{
    width:100%;padding:12px 14px;font-size:14px;font-family:inherit;
    border:1px solid var(--ink-100);border-radius:4px;background:#fff;color:var(--ink-700);
    transition:border var(--t);outline:none;
}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{
    border-color:var(--navy-600);box-shadow:0 0 0 3px rgba(43,111,214,.1);
}
.contact-form select{margin-bottom:14px;cursor:pointer}
.contact-form textarea{margin-bottom:18px;resize:vertical;font-family:inherit}
.form-tip{font-size:12px;color:var(--ink-500);text-align:center;margin-top:12px}

/* ===== 页脚 ===== */
.footer{background:var(--navy-900);color:rgba(255,255,255,.7);padding:60px 0 0}
.footer-inner{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:40px}
.footer-brand .logo{color:#fff;margin-bottom:18px}
.footer-brand .logo-text strong{color:#fff}
.footer-brand .logo-text small{color:rgba(255,255,255,.5)}
.footer-brand .logo-mark{color:var(--gold-400)}
.footer-desc{font-size:13px;line-height:1.85;color:rgba(255,255,255,.6)}
.footer-col h5{
    color:#fff;font-size:15px;margin-bottom:18px;font-weight:600;letter-spacing:.5px;
    position:relative;padding-bottom:10px;
}
.footer-col h5::after{content:"";position:absolute;left:0;bottom:0;width:30px;height:2px;background:var(--gold-500)}
.footer-col ul{display:grid;gap:10px}
.footer-col li{font-size:13.5px;color:rgba(255,255,255,.65);transition:color var(--t)}
.footer-col li a:hover{color:var(--gold-400)}
.footer-bottom{
    border-top:1px solid rgba(255,255,255,.08);padding:20px 0;
    font-size:12.5px;color:rgba(255,255,255,.5);
}
.footer-bottom .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom-right{display:flex;gap:20px}
.footer-bottom-right a:hover{color:var(--gold-400)}

/* ===== 滚动动画 ===== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media(max-width:992px){
    .about-grid,.contact-grid{grid-template-columns:1fr;gap:40px}
    .sol-cards,.warning-features,.analysis-grid,.report-cards,.advantages-grid{grid-template-columns:repeat(2,1fr)}
    .industries-grid{grid-template-columns:repeat(4,1fr)}
    .analysis-item-wide{grid-column:span 2}
    .hero-title{font-size:36px}
    .footer-inner{grid-template-columns:1fr 1fr;gap:30px}
}
@media(max-width:768px){
    .topbar-right{display:none}
    .nav-menu{
        position:fixed;top:72px;left:0;right:0;background:#fff;
        flex-direction:column;align-items:stretch;padding:20px;
        box-shadow:var(--shadow-md);gap:0;transform:translateY(-150%);
        transition:transform var(--t);max-height:calc(100vh - 72px);overflow-y:auto;
    }
    .nav-menu.open{transform:translateY(0)}
    .nav-link{padding:14px;border-bottom:1px solid var(--ink-100)}
    .nav-link::after{display:none}
    .nav-toggle{display:flex}
    .nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .nav-toggle.open span:nth-child(2){opacity:0}
    .nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .section{padding:60px 0}
    .section-title{font-size:26px}
    .hero{padding:60px 0 100px}
    .hero-title{font-size:30px}
    .hero-desc{font-size:14.5px}
    .hero-stats{gap:30px}
    .stat-num{font-size:32px}
    .stat:not(:last-child)::after{right:-15px;height:28px}
    .sol-cards,.warning-features,.analysis-grid,.report-cards,.advantages-grid,.industries-grid{grid-template-columns:1fr}
    .analysis-item-wide{grid-column:span 1}
    .contact-info{grid-template-columns:1fr}
    .form-row{grid-template-columns:1fr}
    .footer-inner{grid-template-columns:1fr}
    .cta-inner{flex-direction:column;text-align:center}
}