/* ===== 重置 & 基础变量 ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
    --primary:#2563eb;
    --primary-dark:#1e40af;
    --primary-light:#3b82f6;
    --accent:#06b6d4;
    --accent-2:#8b5cf6;
    --dark:#0f172a;
    --dark-2:#1e293b;
    --gray-50:#f8fafc;
    --gray-100:#f1f5f9;
    --gray-200:#e2e8f0;
    --gray-300:#cbd5e1;
    --gray-500:#64748b;
    --gray-600:#475569;
    --gray-700:#334155;
    --gray-900:#0f172a;
    --white:#ffffff;
    --radius:16px;
    --radius-sm:10px;
    --shadow-sm:0 1px 3px rgba(15,23,42,.08);
    --shadow:0 8px 30px rgba(15,23,42,.08);
    --shadow-lg:0 20px 60px rgba(15,23,42,.12);
    --gradient:linear-gradient(135deg,#2563eb 0%,#06b6d4 100%);
    --gradient-2:linear-gradient(135deg,#8b5cf6 0%,#2563eb 100%);
    --transition:all .35s cubic-bezier(.4,0,.2,1);
    --max-width:1200px;
}

html{scroll-behavior:smooth;font-size:16px}
body{
    font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color:var(--gray-700);
    background:var(--white);
    line-height:1.7;
    overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}
sup{font-size:.5em;font-weight:700;vertical-align:super;margin-left:2px}

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

/* ===== 按钮 ===== */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:6px;
    padding:14px 32px;border-radius:var(--radius-sm);font-size:.95rem;font-weight:600;
    cursor:pointer;border:none;transition:var(--transition);white-space:nowrap;
}
.btn-primary{background:var(--gradient);color:#fff;box-shadow:0 4px 20px rgba(37,99,235,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(37,99,235,.45)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.4)}
.btn-outline:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.8)}
.btn-light{background:#fff;color:var(--primary);box-shadow:var(--shadow)}
.btn-light:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.btn-full{width:100%}

.gradient-text{
    background:var(--gradient);-webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
}

/* ===== 导航栏 ===== */
.navbar{
    position:fixed;top:0;left:0;right:0;z-index:1000;
    background:rgba(15,23,42,.4);backdrop-filter:blur(20px);
    border-bottom:1px solid rgba(255,255,255,.08);
    transition:var(--transition);
}
.navbar.scrolled{background:rgba(255,255,255,.95);backdrop-filter:blur(20px);box-shadow:var(--shadow-sm)}
.nav-container{
    max-width:var(--max-width);margin:0 auto;padding:0 24px;
    height:70px;display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{display:flex;align-items:center;gap:8px;font-size:1.3rem;font-weight:800;color:#fff;transition:var(--transition)}
.navbar.scrolled .nav-logo{color:var(--dark)}
.logo-icon{font-size:1.4rem;filter:drop-shadow(0 0 8px rgba(6,182,212,.6))}
.nav-menu{display:flex;gap:8px}
.nav-link{
    position:relative;padding:8px 16px;font-size:.92rem;font-weight:500;color:rgba(255,255,255,.8);
    border-radius:8px;transition:var(--transition);
}
.nav-link:hover,.nav-link.active{color:#fff}
.navbar.scrolled .nav-link{color:var(--gray-600)}
.navbar.scrolled .nav-link:hover,.navbar.scrolled .nav-link.active{color:var(--primary)}
.nav-link::after{
    content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);
    width:0;height:2px;background:var(--gradient);border-radius:2px;transition:var(--transition);
}
.nav-link:hover::after,.nav-link.active::after{width:60%}

.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:var(--transition)}
.navbar.scrolled .nav-toggle span{background:var(--dark)}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{
    position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;
    text-align:center;overflow:hidden;background:var(--dark);color:#fff;
}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-grid{
    position:absolute;inset:0;
    background-image:linear-gradient(rgba(37,99,235,.07) 1px,transparent 1px),
                     linear-gradient(90deg,rgba(37,99,235,.07) 1px,transparent 1px);
    background-size:50px 50px;
    mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,#000 30%,transparent 80%);
    -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,#000 30%,transparent 80%);
}
.hero-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;animation:float 8s ease-in-out infinite}
.orb-1{width:500px;height:500px;background:radial-gradient(circle,#2563eb,transparent);top:-100px;right:-50px}
.orb-2{width:400px;height:400px;background:radial-gradient(circle,#8b5cf6,transparent);bottom:-80px;left:-50px;animation-delay:2s}
@keyframes float{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-30px) scale(1.05)}}

.hero-content{position:relative;z-index:2;max-width:800px;padding:120px 24px 80px}
.hero-badge{
    display:inline-block;padding:8px 20px;border-radius:50px;font-size:.85rem;font-weight:500;
    background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);
    margin-bottom:28px;backdrop-filter:blur(10px);
}
.hero-title{font-size:clamp(2.2rem,6vw,4rem);font-weight:800;line-height:1.2;letter-spacing:-.02em;margin-bottom:24px}
.hero-subtitle{font-size:1.05rem;color:rgba(255,255,255,.7);margin-bottom:40px;line-height:1.8}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:60px}

.hero-stats{display:flex;gap:40px;justify-content:center;flex-wrap:wrap}
.hero-stat{display:flex;flex-direction:column;align-items:center}
.hero-stat-num{font-size:2rem;font-weight:800;background:var(--gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-stat-label{font-size:.85rem;color:rgba(255,255,255,.5);margin-top:4px}

.scroll-indicator{
    position:absolute;bottom:30px;left:50%;transform:translateX(-50%);z-index:2;
    width:28px;height:46px;border:2px solid rgba(255,255,255,.3);border-radius:14px;
    display:flex;justify-content:center;
}
.scroll-indicator span{
    width:4px;height:8px;background:rgba(255,255,255,.6);border-radius:2px;margin-top:8px;
    animation:scrollDown 2s infinite;
}
@keyframes scrollDown{0%{transform:translateY(0);opacity:1}100%{transform:translateY(12px);opacity:0}}

/* ===== 通用 Section ===== */
.section{padding:100px 0;position:relative}
.section-alt{background:var(--gray-50)}
.section-header{text-align:center;max-width:680px;margin:0 auto 64px}
.section-tag{
    display:inline-block;padding:6px 18px;border-radius:50px;font-size:.78rem;font-weight:700;
    letter-spacing:.08em;color:var(--primary);background:rgba(37,99,235,.08);
    border:1px solid rgba(37,99,235,.15);margin-bottom:16px;
}
.section-title{font-size:clamp(1.8rem,4vw,2.6rem);font-weight:800;color:var(--dark);margin-bottom:16px;letter-spacing:-.01em}
.section-desc{font-size:1.05rem;color:var(--gray-500)}

/* ===== 关于我们 ===== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}
.about-text h3{font-size:1.6rem;font-weight:700;color:var(--dark);margin-bottom:20px}
.about-text p{margin-bottom:16px;color:var(--gray-600);line-height:1.9}
.about-values{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:32px}
.value-item{padding:24px;background:var(--gray-50);border-radius:var(--radius);border:1px solid var(--gray-200);transition:var(--transition)}
.value-item:hover{border-color:var(--primary-light);box-shadow:var(--shadow);transform:translateY(-4px)}
.value-icon{font-size:2rem;margin-bottom:12px}
.value-item h4{font-size:1.05rem;font-weight:700;color:var(--dark);margin-bottom:6px}
.value-item p{font-size:.9rem;color:var(--gray-500);margin:0}

.about-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.about-card{
    padding:28px;background:#fff;border-radius:var(--radius);border:1px solid var(--gray-200);
    box-shadow:var(--shadow-sm);transition:var(--transition);
}
.about-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.about-card-icon{font-size:2.2rem;margin-bottom:14px;display:inline-block}
.about-card h4{font-size:1.1rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.about-card p{font-size:.9rem;color:var(--gray-500);line-height:1.6}

/* ===== 服务领域 ===== */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{
    position:relative;padding:36px 30px;background:#fff;border-radius:var(--radius);
    border:1px solid var(--gray-200);box-shadow:var(--shadow-sm);transition:var(--transition);
    overflow:hidden;
}
.service-card::before{
    content:'';position:absolute;top:0;left:0;right:0;height:4px;
    background:var(--gradient);transform:scaleX(0);transform-origin:left;transition:transform .4s ease;
}
.service-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:transparent}
.service-card:hover::before{transform:scaleX(1)}
.service-num{position:absolute;top:24px;right:28px;font-size:3.5rem;font-weight:900;color:var(--gray-100);line-height:1;transition:var(--transition)}
.service-card:hover .service-num{color:rgba(37,99,235,.08)}
.service-icon{font-size:2.5rem;margin-bottom:16px;display:inline-block}
.service-card h3{font-size:1.3rem;font-weight:700;color:var(--dark);margin-bottom:12px;position:relative;z-index:1}
.service-card>p{font-size:.92rem;color:var(--gray-500);margin-bottom:18px;line-height:1.7}
.service-list{display:flex;flex-direction:column;gap:8px}
.service-list li{font-size:.88rem;color:var(--gray-600);padding-left:22px;position:relative}
.service-list li::before{content:'✓';position:absolute;left:0;color:var(--primary);font-weight:700}

.service-card-cta{
    background:var(--gradient);color:#fff;display:flex;align-items:center;justify-content:center;
    border:none;
}
.service-card-cta::before{display:none}
.service-card-cta:hover{transform:translateY(-8px);box-shadow:0 20px 60px rgba(37,99,235,.3)}
.service-cta-content h3{color:#fff;font-size:1.4rem;margin-bottom:8px}
.service-cta-content p{color:rgba(255,255,255,.85);font-size:.92rem;margin-bottom:20px}

/* ===== 核心优势 ===== */
.advantage-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.advantage-item{
    padding:32px;background:#fff;border-radius:var(--radius);border:1px solid var(--gray-200);
    text-align:center;transition:var(--transition);
}
.advantage-item:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--primary-light)}
.advantage-icon-wrap{
    width:64px;height:64px;margin:0 auto 18px;border-radius:18px;
    background:linear-gradient(135deg,rgba(37,99,235,.1),rgba(6,182,212,.1));
    display:flex;align-items:center;justify-content:center;font-size:1.8rem;
}
.advantage-item h4{font-size:1.15rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.advantage-item p{font-size:.9rem;color:var(--gray-500);line-height:1.6}

/* ===== 成功案例 ===== */
.cases-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.case-card{
    background:#fff;border-radius:var(--radius);overflow:hidden;
    border:1px solid var(--gray-200);box-shadow:var(--shadow-sm);transition:var(--transition);
}
.case-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.case-image{height:200px;position:relative;display:flex;align-items:flex-end;padding:20px}
.case-tag{
    display:inline-block;padding:6px 14px;border-radius:50px;font-size:.78rem;font-weight:600;
    background:rgba(255,255,255,.95);color:var(--primary);backdrop-filter:blur(10px);
}
.case-bg-1{background:linear-gradient(135deg,#667eea,#764ba2)}
.case-bg-2{background:linear-gradient(135deg,#f093fb,#f5576c)}
.case-bg-3{background:linear-gradient(135deg,#4facfe,#00f2fe)}
.case-bg-4{background:linear-gradient(135deg,#43e97b,#38f9d7)}
.case-bg-5{background:linear-gradient(135deg,#fa709a,#fee140)}
.case-bg-6{background:linear-gradient(135deg,#30cfd0,#330867)}
.case-bg-7{background:linear-gradient(135deg,#2563eb,#06b6d4)}
.case-bg-8{background:linear-gradient(135deg,#f59e0b,#ef4444)}
.case-body{padding:24px}
.case-body h3{font-size:1.15rem;font-weight:700;color:var(--dark);margin-bottom:10px}
.case-body>p{font-size:.9rem;color:var(--gray-500);margin-bottom:14px;line-height:1.6}
.case-tags{display:flex;flex-wrap:wrap;gap:8px}
.case-tags span{
    padding:4px 10px;border-radius:6px;font-size:.76rem;font-weight:500;
    background:var(--gray-100);color:var(--gray-600);
}

/* ===== 合作流程 ===== */
.process-horizontal{display:flex;gap:0;position:relative}
.process-h-step{flex:1;text-align:center;position:relative;padding:0 12px}
.process-h-num{
    width:56px;height:56px;margin:0 auto 20px;border-radius:50%;
    background:#fff;border:3px solid var(--primary);
    display:flex;align-items:center;justify-content:center;
    font-size:1.3rem;font-weight:800;color:var(--primary);
    position:relative;z-index:2;box-shadow:var(--shadow-sm);transition:var(--transition);
}
.process-h-step:hover .process-h-num{background:var(--gradient);color:#fff;border-color:transparent;transform:scale(1.1)}
.process-h-body h4{font-size:1.1rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.process-h-body p{font-size:.88rem;color:var(--gray-500);line-height:1.6}
.process-h-line{
    position:absolute;top:28px;left:calc(50% + 28px);right:calc(-50% + 28px);
    height:3px;background:var(--gray-200);z-index:1;
}
.process-h-step:last-child .process-h-line{display:none}
.process-h-step:hover .process-h-line{background:var(--gradient)}

/* ===== 联系我们 ===== */
.contact-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:48px}
.contact-card-item{
    text-align:center;padding:36px 24px;background:#fff;border-radius:var(--radius);
    border:1px solid var(--gray-200);box-shadow:var(--shadow-sm);transition:var(--transition);
}
.contact-card-item:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--primary-light)}
.contact-card-icon{
    width:64px;height:64px;margin:0 auto 16px;border-radius:18px;
    background:linear-gradient(135deg,rgba(37,99,235,.1),rgba(6,182,212,.1));
    display:flex;align-items:center;justify-content:center;font-size:1.8rem;
}
.contact-card-item h4{font-size:1.1rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.contact-card-item p{font-size:.92rem;color:var(--gray-600);line-height:1.5}
.contact-card-sub{font-size:.82rem;color:var(--gray-500);margin-top:4px}

.contact-banner{
    background:var(--gradient);border-radius:var(--radius);overflow:hidden;
}
.contact-banner-content{
    padding:48px;text-align:center;color:#fff;
}
.contact-banner-content h3{font-size:1.6rem;font-weight:700;margin-bottom:12px}
.contact-banner-content p{font-size:1rem;color:rgba(255,255,255,.85);margin-bottom:24px;line-height:1.7}
.contact-banner-content strong{color:#fff}

/* ===== 页脚 ===== */
.footer{background:var(--dark);color:rgba(255,255,255,.6);padding:64px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:48px}
.footer-brand .nav-logo{margin-bottom:16px}
.footer-brand p{font-size:.9rem;line-height:1.7;max-width:320px}
.footer-col h4{font-size:1rem;font-weight:700;color:#fff;margin-bottom:16px}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col li{font-size:.9rem;transition:var(--transition)}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
    border-top:1px solid rgba(255,255,255,.1);padding-top:24px;
    display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
}
.footer-bottom p{font-size:.85rem}
.footer-tech{color:rgba(255,255,255,.4) !important}

/* ===== 返回顶部 ===== */
.back-to-top{
    position:fixed;bottom:30px;right:30px;width:48px;height:48px;border-radius:50%;
    background:var(--gradient);color:#fff;border:none;font-size:1.4rem;cursor:pointer;
    box-shadow:0 4px 20px rgba(37,99,235,.35);z-index:900;
    opacity:0;visibility:hidden;transform:translateY(20px);transition:var(--transition);
}
.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(37,99,235,.5)}

/* ===== 滚动动画 ===== */
.reveal{opacity:0;transform:translateY(40px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ===== 响应式 ===== */
@media(max-width:1024px){
    .services-grid,.advantage-grid{grid-template-columns:repeat(2,1fr)}
    .cases-grid{grid-template-columns:repeat(2,1fr)}
    .about-grid{gap:40px}
    .contact-cards{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
    .nav-menu{
        position:fixed;top:70px;left:0;right:0;flex-direction:column;
        background:rgba(15,23,42,.97);backdrop-filter:blur(20px);padding:20px;
        gap:4px;transform:translateY(-120%);transition:transform .4s ease;visibility:hidden;
    }
    .nav-menu.open{transform:translateY(0);visibility:visible}
    .nav-link{color:rgba(255,255,255,.85);padding:12px 16px}
    .nav-toggle{display:flex}
    .hero-stats{gap:24px}
    .hero-stat-num{font-size:1.6rem}
    .about-grid{grid-template-columns:1fr;gap:40px}
    .about-values,.about-cards{grid-template-columns:1fr 1fr}
    .services-grid,.cases-grid,.advantage-grid{grid-template-columns:1fr}
    .contact-cards{grid-template-columns:1fr 1fr}
    .contact-banner-content{padding:36px 24px}
    .process-horizontal{flex-direction:column;gap:0}
    .process-h-step{flex:none;text-align:left;padding:12px 0 12px 76px;position:relative}
    .process-h-num{margin:0;position:absolute;left:0;top:8px}
    .process-h-line{
        top:64px;left:27px;right:auto;width:3px;
        height:calc(100% - 20px);bottom:auto;
        background:linear-gradient(to bottom,var(--primary),var(--accent));
    }
    .process-h-step:hover .process-h-line{background:linear-gradient(to bottom,var(--primary),var(--accent))}
    .process-h-step:last-child .process-h-line{display:none}
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
    .section{padding:70px 0}
    .section-header{margin-bottom:48px}
    .footer-bottom{flex-direction:column;text-align:center}
}
@media(max-width:480px){
    .about-values,.about-cards,.footer-grid,.contact-cards{grid-template-columns:1fr}
    .hero-actions{flex-direction:column;align-items:center}
    .hero-actions .btn{width:100%;max-width:280px}
    .contact-banner-content{padding:28px 20px}
    .container{padding:0 16px}
}