/* ============================================
   合法私人调查 - 前台主样式
   简约大气 · 线条简约 · 视觉高级感
   ============================================ */
:root {
    --primary: #0f1923;
    --primary-light: #1a2a3a;
    --accent: #b8935a;
    --accent-dark: #9a7a48;
    --accent-light: #d4b77a;
    --text: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --bg: #ffffff;
    --bg-light: #f8f7f4;
    --bg-dark: #f0efeb;
    --border: #e8e6e1;
    --shadow: 0 2px 20px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --header-height: 80px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.8;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none;transition:var(--transition)}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.4}
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.text-center{text-align:center}
.text-accent{color:var(--accent)}
.section-padding{padding:80px 0}
.section-title{text-align:center;margin-bottom:50px}
.section-title h2{font-size:32px;color:var(--primary);margin-bottom:12px;letter-spacing:2px}
.section-title .title-line{width:50px;height:2px;background:var(--accent);margin:16px auto}
.section-title p{color:var(--text-light);font-size:15px;max-width:600px;margin:0 auto}

/* Header */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:rgba(255,255,255,0.95);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border);z-index:1000;transition:var(--transition)}
.site-header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,0.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:700;color:var(--primary)}
.logo-icon{width:40px;height:40px;background:var(--primary);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--accent);font-size:18px}
.logo span{color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{padding:8px 20px;font-size:15px;color:var(--text-light);border-radius:6px;position:relative;transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{color:var(--accent);background:rgba(184,147,90,0.08)}
.main-nav a.active::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:20px;height:2px;background:var(--accent);border-radius:1px}
.header-phone{display:flex;align-items:center;gap:8px;font-size:16px;font-weight:600;color:var(--accent)}
.header-phone .phone-icon{font-size:20px}
.menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--text);border-radius:1px;transition:var(--transition)}

/* Hero */
.hero{position:relative;height:100vh;min-height:600px;display:flex;align-items:center;justify-content:center;background:var(--primary);overflow:hidden}
.hero-bg{position:absolute;inset:0;background:linear-gradient(135deg,#0f1923 0%,#1a2a3a 40%,#0f1923 100%)}
.hero-bg::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 20% 50%,rgba(184,147,90,0.08) 0%,transparent 60%),radial-gradient(ellipse at 80% 20%,rgba(184,147,90,0.05) 0%,transparent 50%)}
.hero-bg::after{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(184,147,90,0.05) 1px,transparent 1px),linear-gradient(90deg,rgba(184,147,90,0.05) 1px,transparent 1px);background-size:80px 80px}
.hero-content{position:relative;text-align:center;color:#fff;z-index:2}
.hero-content h1{font-size:56px;font-weight:700;letter-spacing:6px;margin-bottom:20px;line-height:1.2}
.hero-content h1 span{color:var(--accent)}
.hero-content .hero-sub{font-size:18px;color:rgba(255,255,255,0.6);letter-spacing:4px;margin-bottom:40px}
.hero-line{width:60px;height:1px;background:var(--accent);margin:0 auto 40px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;border-radius:6px;font-size:15px;font-weight:500;transition:var(--transition);cursor:pointer;border:none;letter-spacing:1px}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 4px 15px rgba(184,147,90,0.3)}
.btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,0.3)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:rgba(184,147,90,0.1)}
.btn-dark{background:var(--primary);color:#fff}
.btn-dark:hover{background:var(--primary-light)}
.scroll-indicator{position:absolute;bottom:40px;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:8px;color:rgba(255,255,255,0.3);font-size:12px;letter-spacing:2px;animation:bounce 2s infinite}
.scroll-indicator .mouse{width:24px;height:38px;border:1px solid rgba(255,255,255,0.3);border-radius:12px;position:relative}
.scroll-indicator .mouse::after{content:'';position:absolute;top:8px;left:50%;transform:translateX(-50%);width:3px;height:8px;background:rgba(255,255,255,0.4);border-radius:2px;animation:scroll-dot 2s infinite}
@keyframes bounce{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(8px)}}
@keyframes scroll-dot{0%{opacity:1;top:8px}100%{opacity:0;top:20px}}

/* Services Grid */
.home-services{background:var(--bg-light)}
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{background:var(--bg);padding:40px 30px;border-radius:var(--radius);border:1px solid var(--border);transition:var(--transition);position:relative;overflow:hidden}
.service-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--accent);transform:scaleX(0);transition:var(--transition)}
.service-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:transparent}
.service-card:hover::before{transform:scaleX(1)}
.service-card .card-icon{width:56px;height:56px;background:rgba(184,147,90,0.1);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:20px}
.service-card h3{font-size:18px;color:var(--primary);margin-bottom:12px}
.service-card p{color:var(--text-light);font-size:14px;line-height:1.8}
.service-card .card-link{display:inline-flex;align-items:center;gap:6px;margin-top:20px;color:var(--accent);font-size:14px;font-weight:500}
.service-card .card-link::after{content:'\2192';transition:var(--transition)}
.service-card:hover .card-link::after{transform:translateX(4px)}

/* Advantages */
.advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.advantage-item{text-align:center;padding:40px 20px;border-radius:var(--radius);transition:var(--transition)}
.advantage-item:hover{background:var(--bg-light)}
.advantage-num{font-size:48px;font-weight:700;color:var(--accent);line-height:1;margin-bottom:8px}
.advantage-unit{font-size:14px;color:var(--text-muted);margin-bottom:12px}
.advantage-item h4{font-size:16px;color:var(--primary);margin-bottom:8px}

/* News */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.news-card{display:flex;gap:20px;padding:24px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);transition:var(--transition)}
.news-card:hover{box-shadow:var(--shadow);border-color:transparent}
.news-card .news-thumb{flex-shrink:0;width:160px;height:120px;background:var(--bg-light);border-radius:6px;overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:13px}
.news-card .news-info{flex:1}
.news-card .news-info .news-meta{font-size:12px;color:var(--text-muted);margin-bottom:8px;display:flex;gap:12px}
.news-card .news-info h3{font-size:16px;color:var(--primary);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card .news-info p{font-size:13px;color:var(--text-light);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* CTA */
.cta-section{background:var(--primary);padding:80px 0;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at center,rgba(184,147,90,0.1) 0%,transparent 70%)}
.cta-section h2{font-size:36px;margin-bottom:16px;position:relative;letter-spacing:2px}
.cta-section p{font-size:16px;color:rgba(255,255,255,0.6);margin-bottom:32px;position:relative}
.cta-section .btn{position:relative}

/* Page Banner */
.page-banner{height:360px;background:var(--primary);display:flex;align-items:center;justify-content:center;position:relative;margin-top:var(--header-height);overflow:hidden}
.page-banner::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 30% 50%,rgba(184,147,90,0.1) 0%,transparent 60%),radial-gradient(ellipse at 70% 30%,rgba(184,147,90,0.06) 0%,transparent 50%)}
.page-banner::after{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(184,147,90,0.03) 1px,transparent 1px),linear-gradient(90deg,rgba(184,147,90,0.03) 1px,transparent 1px);background-size:60px 60px}
.page-banner-content{position:relative;text-align:center;color:#fff;z-index:2}
.page-banner-content h1{font-size:36px;letter-spacing:4px;margin-bottom:12px}
.page-banner .breadcrumb{font-size:14px;color:rgba(255,255,255,0.5)}
.page-banner .breadcrumb a{color:rgba(255,255,255,0.5)}
.page-banner .breadcrumb a:hover{color:var(--accent)}
.page-banner .breadcrumb span{margin:0 8px}

/* About */
.about-content{max-width:900px;margin:0 auto}
.about-content h3{font-size:22px;color:var(--primary);margin:40px 0 16px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.about-content h3:first-child{margin-top:0}
.about-content p{color:var(--text-light);margin-bottom:16px;line-height:2}
.about-content ul{padding-left:0}
.about-content li{padding:8px 0;color:var(--text-light);line-height:1.8;position:relative;padding-left:20px}
.about-content li::before{content:'';position:absolute;left:0;top:16px;width:6px;height:6px;background:var(--accent);border-radius:50%}
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin:24px 0}
.value-item{text-align:center;padding:30px 20px;background:var(--bg-light);border-radius:var(--radius);transition:var(--transition)}
.value-item:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.value-icon{font-size:32px;margin-bottom:12px}
.value-item h4{font-size:16px;color:var(--primary);margin-bottom:8px}
.value-item p{font-size:13px;color:var(--text-light);line-height:1.6}

/* Services Page */
.service-detail-grid{display:flex;flex-direction:column;gap:16px;max-width:900px;margin:0 auto}
.service-detail-card{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:var(--transition)}
.service-detail-card:hover{box-shadow:var(--shadow-hover);border-color:transparent}
.service-detail-header{padding:30px;background:var(--bg-light);display:flex;align-items:center;gap:16px;cursor:pointer}
.service-detail-header .sd-icon{width:50px;height:50px;background:rgba(184,147,90,0.1);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}
.service-detail-header h3{font-size:18px;color:var(--primary)}
.service-detail-header .sd-arrow{margin-left:auto;color:var(--accent);transition:var(--transition);font-size:14px}
.service-detail-body{padding:24px 30px;display:none}
.service-detail-card.open .service-detail-body{display:block}
.service-detail-card.open .sd-arrow{transform:rotate(180deg)}
.service-detail-body h4{font-size:15px;color:var(--primary);margin:16px 0 8px}
.service-detail-body p{color:var(--text-light);font-size:14px;line-height:1.8}
.service-detail-body ul{padding:0}
.service-detail-body li{padding:6px 0;color:var(--text-light);font-size:14px;position:relative;padding-left:16px}
.service-detail-body li::before{content:'\2022';position:absolute;left:0;color:var(--accent)}

/* News Page */
.news-filter{display:flex;gap:8px;margin-bottom:30px;flex-wrap:wrap}
.news-filter a{padding:8px 20px;border-radius:4px;font-size:14px;color:var(--text-light);border:1px solid var(--border);transition:var(--transition)}
.news-filter a:hover,.news-filter a.active{color:#fff;background:var(--accent);border-color:var(--accent)}
.news-list-card{display:flex;gap:24px;padding:28px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px;transition:var(--transition)}
.news-list-card:hover{box-shadow:var(--shadow);border-color:transparent}
.news-list-thumb{flex-shrink:0;width:220px;height:150px;background:var(--bg-light);border-radius:6px;overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--text-muted)}
.news-list-info{flex:1}
.news-list-info .nl-meta{font-size:12px;color:var(--text-muted);margin-bottom:10px;display:flex;gap:16px}
.news-list-info .nl-tag{display:inline-block;padding:2px 10px;background:rgba(184,147,90,0.1);color:var(--accent);border-radius:3px;font-size:12px}
.news-list-info h3{font-size:18px;color:var(--primary);margin-bottom:10px}
.news-list-info h3 a:hover{color:var(--accent)}
.news-list-info p{font-size:14px;color:var(--text-light);line-height:1.8;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}

/* News Detail */
.news-detail{max-width:800px;margin:0 auto}
.news-detail h1{font-size:28px;color:var(--primary);margin-bottom:16px;line-height:1.4}
.news-detail .nd-meta{font-size:14px;color:var(--text-muted);padding-bottom:20px;border-bottom:1px solid var(--border);margin-bottom:30px;display:flex;gap:20px}
.news-detail .nd-content{font-size:16px;line-height:2;color:var(--text)}
.news-detail .nd-content h3{font-size:20px;color:var(--primary);margin:30px 0 16px}
.news-detail .nd-content h4{font-size:16px;color:var(--primary);margin:20px 0 8px}
.news-detail .nd-content p{margin-bottom:16px}
.news-detail .nd-content ul{padding-left:0;margin-bottom:16px}
.news-detail .nd-content li{padding:4px 0 4px 20px;position:relative}
.news-detail .nd-content li::before{content:'\2022';position:absolute;left:0;color:var(--accent)}

/* Pagination */
.pagination{display:flex;justify-content:center;gap:4px;margin-top:40px}
.pagination a,.pagination span{display:inline-flex;align-items:center;justify-content:center;min-width:40px;height:40px;padding:0 12px;border-radius:6px;font-size:14px;color:var(--text-light);border:1px solid var(--border);transition:var(--transition)}
.pagination a:hover{color:var(--accent);border-color:var(--accent)}
.pagination .current{background:var(--accent);color:#fff;border-color:var(--accent)}

/* Contact */
.contact-layout{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-form-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:40px}
.contact-form-card h3{font-size:22px;color:var(--primary);margin-bottom:24px}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:14px;color:var(--text);margin-bottom:8px;font-weight:500}
.form-group label .required{color:#e74c3c}
.form-control{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:6px;font-size:14px;font-family:inherit;color:var(--text);background:var(--bg);transition:var(--transition);outline:none}
.form-control:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(184,147,90,0.1)}
textarea.form-control{resize:vertical;min-height:120px}
select.form-control{appearance:auto}
.contact-info-card{background:var(--primary);border-radius:var(--radius);padding:40px;color:#fff}
.contact-info-card h3{font-size:22px;margin-bottom:30px;color:#fff}
.contact-info-list .ci-item{display:flex;align-items:flex-start;gap:16px;padding:20px 0;border-bottom:1px solid rgba(255,255,255,0.1)}
.contact-info-list .ci-item:last-child{border-bottom:none}
.ci-icon{width:44px;height:44px;background:rgba(184,147,90,0.15);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.ci-item h4{font-size:14px;color:rgba(255,255,255,0.6);font-weight:400;margin-bottom:4px}
.ci-item p{font-size:16px;color:#fff}
.flow-steps{display:flex;gap:0;margin-top:24px}
.flow-step{flex:1;text-align:center;padding:30px 20px;position:relative}
.flow-step::after{content:'\2192';position:absolute;right:-8px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:20px}
.flow-step:last-child::after{display:none}
.step-num{font-size:36px;font-weight:700;color:rgba(184,147,90,0.15);margin-bottom:12px}
.flow-step h4{font-size:16px;color:var(--primary);margin-bottom:8px}
.flow-step p{font-size:13px;color:var(--text-light)}
.info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin:24px 0}
.info-item{display:flex;align-items:flex-start;gap:16px;padding:24px;background:var(--bg-light);border-radius:var(--radius);transition:var(--transition)}
.info-item:hover{box-shadow:var(--shadow)}
.info-icon{font-size:28px}
.info-item h4{font-size:14px;color:var(--text-muted);margin-bottom:4px}
.info-item p{font-size:16px;color:var(--primary);font-weight:500}

/* Footer */
.site-footer{background:var(--primary);color:rgba(255,255,255,0.7);padding-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.08)}
.footer-about .logo{color:#fff;margin-bottom:16px}
.footer-about .logo span{color:var(--accent)}
.footer-about p{font-size:14px;line-height:1.8;color:rgba(255,255,255,0.5)}
.footer-col h4{font-size:16px;color:#fff;margin-bottom:20px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--accent)}
.footer-col ul{padding:0}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:14px;color:rgba(255,255,255,0.5)}
.footer-col a:hover{color:var(--accent)}
.footer-contact-list .fc-item{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:14px}
.footer-bottom{padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,0.3)}
.footer-bottom a{color:rgba(255,255,255,0.3)}
.footer-bottom a:hover{color:var(--accent)}

/* Back to Top */
.back-to-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:var(--accent);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition);z-index:999;border:none;box-shadow:0 2px 10px rgba(184,147,90,0.3)}
.back-to-top.show{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--accent-dark);transform:translateY(-2px)}

/* Animations - CSS-only fallback for no-JS or slow observer */
@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeInUp 0.7s ease both}
.fade-in:nth-child(1){animation-delay:0s}
.fade-in:nth-child(2){animation-delay:0.1s}
.fade-in:nth-child(3){animation-delay:0.15s}
.fade-in:nth-child(4){animation-delay:0.2s}
.fade-in:nth-child(5){animation-delay:0.25s}
.fade-in:nth-child(6){animation-delay:0.3s}

/* Toast */
.toast{position:fixed;top:100px;left:50%;transform:translateX(-50%) translateY(-20px);padding:14px 28px;border-radius:8px;font-size:14px;z-index:9999;opacity:0;transition:all 0.3s ease;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast-success{background:#27ae60;color:#fff;box-shadow:0 4px 15px rgba(39,174,96,0.3)}
.toast-error{background:#e74c3c;color:#fff;box-shadow:0 4px 15px rgba(231,76,60,0.3)}

/* Responsive */
@media(max-width:1024px){
    .service-grid,.values-grid{grid-template-columns:repeat(2,1fr)}
    .advantages-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:repeat(2,1fr)}
    .service-detail-grid{max-width:100%}
    .contact-layout{grid-template-columns:1fr}
}
@media(max-width:768px){
    :root{--header-height:64px}
    .main-nav{display:none;position:fixed;top:var(--header-height);left:0;right:0;background:var(--bg);flex-direction:column;padding:20px;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
    .main-nav.open{display:flex}
    .main-nav a{padding:12px 20px;width:100%}
    .menu-toggle{display:flex}
    .header-phone{display:none}
    .hero-content h1{font-size:32px;letter-spacing:3px}
    .hero-content .hero-sub{font-size:14px;letter-spacing:2px}
    .page-banner{height:240px}
    .page-banner-content h1{font-size:28px}
    .service-grid,.news-grid{grid-template-columns:1fr}
    .advantages-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1fr}
    .news-list-card{flex-direction:column}
    .news-list-thumb{width:100%;height:180px}
    .info-grid{grid-template-columns:1fr}
    .flow-steps{flex-direction:column}
    .flow-step::after{display:none}
    .section-padding{padding:50px 0}
    .values-grid{grid-template-columns:1fr}
}