/* ============================================
   潮点创意 — Dark Tech Theme
   ============================================ */
:root {
    --bg: #0a0a0f;
    --bg-2: #12121a;
    --bg-3: #1a1a26;
    --surface: #1e1e2e;
    --border: rgba(255,255,255,.08);
    --border-hover: rgba(255,255,255,.18);
    --text: #e4e4e7;
    --text-2: #9898a6;
    --text-3: #5a5a6e;
    --accent: #a855f7;
    --accent-2: #06b6d4;
    --gradient: linear-gradient(135deg, #a855f7, #06b6d4);
    --font-en: 'Space Grotesk', monospace;
    --font-cn: 'Noto Sans SC', sans-serif;
    --ease: cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

html{scroll-behavior:smooth;font-size:16px;-webkit-font-smoothing:antialiased}

body{
    font-family:var(--font-cn);
    background:var(--bg);
    color:var(--text);
    line-height:1.6;
    overflow-x:hidden;
}

a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- cursor glow ---------- */
.cursor-glow{
    position:fixed;
    width:400px;height:400px;
    border-radius:50%;
    pointer-events:none;
    background:radial-gradient(circle, rgba(168,85,247,.12) 0%, transparent 70%);
    transform:translate(-50%,-50%);
    z-index:9999;
    transition:opacity .3s;
    opacity:0;
}
body:hover .cursor-glow{opacity:1}

/* ---------- header ---------- */
.header{
    position:fixed;top:0;left:0;width:100%;
    z-index:100;
    padding:20px 0;
    transition:all .4s var(--ease);
}
.header.scrolled{
    background:rgba(10,10,15,.85);
    backdrop-filter:blur(16px);
    padding:12px 0;
    border-bottom:1px solid var(--border);
}
.header-inner{
    max-width:1200px;margin:0 auto;padding:0 24px;
    display:flex;justify-content:space-between;align-items:center;
}

.logo{display:flex;align-items:center;gap:10px}
.logo-icon{
    display:inline-flex;align-items:center;justify-content:center;
    width:36px;height:36px;
    border-radius:8px;
    background:var(--gradient);
    color:#fff;font-family:var(--font-en);font-weight:700;font-size:.8rem;
}
.logo-text{font-family:var(--font-en);font-weight:600;font-size:1.1rem;letter-spacing:.04em;color:#fff}
.logo-dot{color:var(--accent)}

.nav{display:flex;gap:32px;align-items:center}
.nav-link{
    font-size:.85rem;
    color:var(--text-2);
    position:relative;
    transition:color .3s;
    font-family:var(--font-cn);
}
.nav-link::before{
    content:attr(data-index);
    font-family:var(--font-en);
    font-size:.6rem;
    color:var(--text-3);
    position:absolute;top:-10px;left:0;
    opacity:0;transform:translateY(4px);
    transition:all .3s var(--ease);
}
.nav-link:hover,.nav-link.active{color:#fff}
.nav-link:hover::before,.nav-link.active::before{opacity:1;transform:translateY(0)}

.menu-toggle{
    display:none;
    background:none;border:none;cursor:pointer;
    flex-direction:column;gap:5px;padding:4px;
}
.menu-toggle span{
    display:block;width:24px;height:2px;
    background:var(--text);
    transition:all .3s var(--ease);
    transform-origin:center;
}
.menu-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- hero ---------- */
.hero{
    min-height:100vh;
    display:flex;align-items:center;
    position:relative;
    overflow:hidden;
    padding:120px 0 80px;
}
.hero-grid-bg{
    position:absolute;inset:0;
    background-image:
        linear-gradient(rgba(168,85,247,.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(168,85,247,.06) 1px, transparent 1px);
    background-size:60px 60px;
    mask-image:radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 100%);
    -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 100%);
}
.hero-content{
    max-width:1200px;margin:0 auto;padding:0 24px;
    display:grid;grid-template-columns:1fr 1fr;gap:80px;
    align-items:center;width:100%;
}
.hero-tag{
    display:inline-flex;align-items:center;gap:8px;
    font-family:var(--font-en);font-size:.8rem;
    color:var(--text-2);letter-spacing:.08em;
    margin-bottom:24px;
}
.tag-dot{
    width:6px;height:6px;border-radius:50%;
    background:var(--accent);
    box-shadow:0 0 8px var(--accent);
    animation:pulse 2s infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

.hero-title{
    font-size:clamp(3rem,6vw,5.5rem);
    font-weight:900;
    line-height:1.05;
    letter-spacing:-.03em;
    margin-bottom:24px;
}
.gradient-text{
    background:var(--gradient);
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
}
.hero-desc{
    font-size:1.05rem;
    color:var(--text-2);
    line-height:1.8;
    margin-bottom:40px;
    max-width:480px;
}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}

/* buttons */
.btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:14px 28px;
    border-radius:8px;
    font-size:.9rem;font-weight:500;
    transition:all .3s var(--ease);
    border:none;cursor:pointer;
    font-family:var(--font-cn);
}
.btn-primary{
    background:var(--gradient);color:#fff;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(168,85,247,.3)}
.btn-ghost{
    border:1px solid var(--border-hover);
    color:var(--text);
    background:transparent;
}
.btn-ghost:hover{border-color:var(--accent);color:#fff}
.btn-lg{padding:18px 36px;font-size:1rem}
.btn-full{width:100%;justify-content:center}

/* hero stats */
.hero-stats-grid{
    display:grid;grid-template-columns:1fr 1fr;gap:16px;
}
.stat-card{
    background:var(--bg-2);
    border:1px solid var(--border);
    border-radius:12px;
    padding:28px 24px;
    text-align:center;
    transition:all .4s var(--ease);
}
.stat-card:hover{
    border-color:var(--accent);
    transform:translateY(-4px);
    box-shadow:0 12px 40px rgba(168,85,247,.12);
}
.stat-num{
    font-family:var(--font-en);
    font-size:2.4rem;font-weight:700;
    background:var(--gradient);
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
}
.stat-unit{
    font-family:var(--font-en);
    font-size:1.2rem;font-weight:600;
    color:var(--accent-2);
}
.stat-label{
    display:block;margin-top:6px;
    font-size:.8rem;color:var(--text-3);
}

/* ---------- sections ---------- */
.section{padding:100px 0}

.section-label,.about-label{
    display:flex;align-items:center;gap:12px;
    margin-bottom:16px;
}
.label-line{width:40px;height:1px;background:var(--accent)}
.label-text{
    font-family:var(--font-en);font-size:.75rem;
    color:var(--text-3);letter-spacing:.15em;
}
.label-num{
    font-family:var(--font-en);font-size:.7rem;
    color:var(--text-3);opacity:.5;
}

.section-title{
    font-size:clamp(2rem,4vw,3rem);
    font-weight:800;
    margin-bottom:48px;
    letter-spacing:-.02em;
}

/* ---------- about ---------- */
.about-layout{
    display:grid;grid-template-columns:200px 1fr;
    gap:40px 60px;
}
.about-label{
    grid-column:1/-1;
}
.about-main{grid-column:1/-1}
.about-lead{
    font-size:1.15rem;
    color:var(--text-2);
    line-height:1.9;
    max-width:800px;
    margin-bottom:24px;
}
.about-detail p{
    color:var(--text-2);
    line-height:1.9;
    margin-bottom:24px;
    max-width:700px;
}
.about-tags{display:flex;gap:10px;flex-wrap:wrap}
.tag{
    padding:6px 16px;
    border:1px solid var(--border);
    border-radius:100px;
    font-size:.8rem;
    color:var(--text-2);
    transition:all .3s var(--ease);
}
.tag:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- services ---------- */
.services-list{display:flex;flex-direction:column}
.service-row{
    display:grid;
    grid-template-columns:60px 180px 1fr auto;
    align-items:center;
    gap:24px;
    padding:28px 0;
    border-bottom:1px solid var(--border);
    cursor:pointer;
    transition:all .4s var(--ease);
}
.service-row:first-child{border-top:1px solid var(--border)}
.service-row:hover{padding-left:16px;background:rgba(168,85,247,.03)}
.service-num{
    font-family:var(--font-en);font-size:.8rem;
    color:var(--text-3);
}
.service-name{
    font-size:1.15rem;font-weight:600;
    transition:color .3s;
}
.service-row:hover .service-name{color:var(--accent)}
.service-desc{
    font-size:.9rem;color:var(--text-3);
    transition:color .3s;
}
.service-row:hover .service-desc{color:var(--text-2)}
.service-arrow{
    font-family:var(--font-en);
    font-size:1.2rem;
    color:var(--text-3);
    transition:all .3s var(--ease);
}
.service-row:hover .service-arrow{color:var(--accent);transform:translateX(4px)}

/* ---------- works ---------- */
.works-section{background:var(--bg-2)}
.works-mosaic{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    grid-auto-rows:260px;
    gap:16px;
}
.work-item{
    position:relative;
    border-radius:12px;
    overflow:hidden;
    cursor:pointer;
}
.work-bg{
    position:absolute;inset:0;
    transition:transform .6s var(--ease);
}
.work-item:hover .work-bg{transform:scale(1.08)}
.work-overlay{
    position:absolute;inset:0;
    background:linear-gradient(to top, rgba(0,0,0,.8) 0%, transparent 50%);
    padding:24px;
    display:flex;flex-direction:column;justify-content:flex-end;
    transition:all .4s var(--ease);
}
.work-cat{
    font-family:var(--font-en);
    font-size:.7rem;
    color:var(--accent);
    letter-spacing:.08em;
    text-transform:uppercase;
    margin-bottom:6px;
}
.work-overlay h3{font-size:1.1rem;font-weight:600;margin-bottom:4px}
.work-overlay p{font-size:.85rem;color:var(--text-2)}

.work-hero-item{grid-row:span 2}
.work-wide-item{grid-column:span 2}

/* ---------- process ---------- */
.process-timeline{
    display:flex;flex-direction:column;gap:0;
    padding-left:40px;
    position:relative;
}
.process-item{
    display:flex;gap:40px;
    position:relative;
    padding:32px 0;
    opacity:0;transform:translateY(20px);
    transition:all .6s var(--ease);
}
.process-item.visible{opacity:1;transform:translateY(0)}
.process-marker{
    display:flex;flex-direction:column;align-items:center;
    position:relative;
    flex-shrink:0;
}
.marker-num{
    width:48px;height:48px;
    border-radius:50%;
    border:1px solid var(--border);
    display:flex;align-items:center;justify-content:center;
    font-family:var(--font-en);font-size:.85rem;font-weight:600;
    color:var(--text-2);
    background:var(--bg);
    transition:all .4s var(--ease);
    position:relative;
    z-index:1;
}
.process-item:hover .marker-num{
    border-color:var(--accent);
    color:var(--accent);
    box-shadow:0 0 20px rgba(168,85,247,.2);
}
.marker-line{
    width:1px;
    flex:1;
    background:var(--border);
    margin-top:8px;
}
.process-content h3{
    font-size:1.2rem;font-weight:600;
    margin-bottom:8px;
    padding-top:12px;
}
.process-content p{
    color:var(--text-2);font-size:.95rem;
    max-width:500px;
}

/* ---------- CTA ---------- */
.cta-section{padding:60px 0}
.cta-box{
    background:var(--bg-2);
    border:1px solid var(--border);
    border-radius:20px;
    padding:80px 40px;
    text-align:center;
    position:relative;
    overflow:hidden;
}
.cta-box::before{
    content:'';position:absolute;
    width:600px;height:600px;
    background:radial-gradient(circle, rgba(168,85,247,.1) 0%, transparent 70%);
    top:-300px;left:50%;transform:translateX(-50%);
    pointer-events:none;
}
.cta-box h2{
    font-size:clamp(2rem,4vw,3rem);
    font-weight:800;
    margin-bottom:16px;
}
.cta-box p{
    color:var(--text-2);
    margin-bottom:32px;
    font-size:1.05rem;
}

/* ---------- contact ---------- */
.contact-split{
    display:grid;grid-template-columns:1fr 1fr;
    gap:60px;
}
.contact-block{margin-bottom:28px}
.contact-label{
    font-family:var(--font-en);
    font-size:.7rem;
    letter-spacing:.12em;
    color:var(--accent);
    text-transform:uppercase;
    margin-bottom:6px;
    display:block;
}
.contact-block p{color:var(--text-2);font-size:.95rem}

.contact-form{display:flex;flex-direction:column;gap:16px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.contact-form input,
.contact-form select,
.contact-form textarea{
    width:100%;
    padding:14px 18px;
    background:var(--bg-2);
    border:1px solid var(--border);
    border-radius:8px;
    color:var(--text);
    font-size:.9rem;
    font-family:var(--font-cn);
    transition:border-color .3s;
    outline:none;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus{
    border-color:var(--accent);
}
.contact-form select{cursor:pointer;appearance:none;
    background-image:url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%239898a6' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat:no-repeat;background-position:right 16px center;
}
.contact-form textarea{resize:vertical;min-height:100px}
.contact-form option{background:var(--bg-2);color:var(--text)}

/* ---------- footer ---------- */
.footer{
    border-top:1px solid var(--border);
    padding:48px 0 32px;
}
.footer-top{
    display:flex;justify-content:space-between;align-items:flex-start;
    margin-bottom:40px;
}
.footer-brand{display:flex;flex-direction:column;gap:8px}
.footer-brand .logo-icon{width:32px;height:32px;font-size:.7rem}
.footer-brand p{color:var(--text-3);font-size:.85rem;margin-top:4px}
.footer-nav{display:flex;gap:24px}
.footer-nav a{
    font-size:.85rem;color:var(--text-3);
    transition:color .3s;
}
.footer-nav a:hover{color:var(--accent)}
.footer-bottom{
    display:flex;justify-content:space-between;
    padding-top:24px;
    border-top:1px solid var(--border);
}
.footer-bottom p{font-size:.8rem;color:var(--text-3)}

/* ---------- back to top ---------- */
.back-to-top{
    position:fixed;bottom:32px;right:32px;
    width:44px;height:44px;
    border-radius:50%;
    background:var(--surface);
    border:1px solid var(--border);
    color:var(--text);
    font-size:1.1rem;
    cursor:pointer;
    opacity:0;pointer-events:none;
    transition:all .3s var(--ease);
    z-index:90;
}
.back-to-top.visible{opacity:1;pointer-events:auto}
.back-to-top:hover{
    border-color:var(--accent);
    background:var(--accent);
    color:#fff;
    transform:translateY(-3px);
}

/* ---------- animations ---------- */
.fade-up{opacity:0;transform:translateY(30px);transition:all .7s var(--ease)}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ---------- responsive ---------- */
@media(max-width:900px){
    .hero-content{grid-template-columns:1fr;gap:48px}
    .hero-stats-grid{grid-template-columns:1fr 1fr}
    .about-layout{grid-template-columns:1fr}
    .service-row{grid-template-columns:40px 1fr auto;gap:16px}
    .service-desc{display:none}
    .works-mosaic{grid-template-columns:1fr 1fr;grid-auto-rows:200px}
    .work-hero-item{grid-row:span 1}
    .work-wide-item{grid-column:span 1}
    .contact-split{grid-template-columns:1fr}
}
@media(max-width:640px){
    .section{padding:72px 0}
    .hero{padding:100px 0 60px}
    .hero-title{font-size:2.8rem}
    .nav{
        position:fixed;top:0;right:-100%;
        width:70%;height:100vh;
        background:var(--bg);
        flex-direction:column;
        justify-content:center;
        gap:28px;
        padding:40px;
        transition:right .4s var(--ease);
        border-left:1px solid var(--border);
    }
    .nav.open{right:0}
    .menu-toggle{display:flex}
    .hero-stats-grid{grid-template-columns:1fr 1fr}
    .stat-card{padding:20px 16px}
    .stat-num{font-size:1.8rem}
    .works-mosaic{grid-template-columns:1fr;grid-auto-rows:180px}
    .form-row{grid-template-columns:1fr}
    .cta-box{padding:48px 24px}
    .footer-top{flex-direction:column;gap:24px}
    .footer-bottom{flex-direction:column;gap:8px;text-align:center}
    .footer-brand{flex-direction:row;align-items:center;flex-wrap:wrap}
}