/* ===== CSS Reset & Base ===== */
*,*::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','Microsoft YaHei',sans-serif;background:#0b0f1c;color:#e0e6f0;line-height:1.7;overflow-x:hidden}

/* ===== CSS Variables ===== */
:root{
  --bg-primary:#0b0f1c;
  --bg-secondary:#111627;
  --bg-card:#162033;
  --eth-blue:#627eea;
  --eth-blue-light:#7c93f0;
  --eth-cyan:#00d4aa;
  --green:#10b981;
  --green-light:#34d399;
  --nft-purple:#8b5cf6;
  --nft-purple-light:#a78bfa;
  --gold:#f59e0b;
  --gold-light:#fbbf24;
  --white:#ffffff;
  --text-primary:#e0e6f0;
  --text-secondary:#8892a8;
  --border-color:#1e2a45;
  --radius:12px;
  --radius-lg:20px;
  --shadow:0 4px 24px rgba(0,0,0,.25);
  --shadow-lg:0 8px 48px rgba(0,0,0,.4);
  --transition:.3s cubic-bezier(.4,0,.2,1);
}

/* ===== Animations ===== */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(16,185,129,.4)}50%{box-shadow:0 0 0 20px rgba(16,185,129,0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes progressFill{from{width:0}to{width:100%}}
@keyframes slideInLeft{from{opacity:0;transform:translateX(-30px)}to{opacity:1;transform:translateX(0)}}
@keyframes slideInRight{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:translateX(0)}}
@keyframes brandSwitch{0%,30%{opacity:1;transform:scale(1)}35%,100%{opacity:.2;transform:scale(.9)}}
@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
@keyframes glowPulse{0%,100%{text-shadow:0 0 20px rgba(98,126,234,.3)}50%{text-shadow:0 0 40px rgba(98,126,234,.6)}}

.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s,transform .8s}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ===== Header & Navigation ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(11,15,28,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--border-color);transition:var(--transition)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;padding:0 24px;height:64px;max-width:1280px;margin:0 auto}
.logo{font-size:1.5rem;font-weight:800;text-decoration:none;background:linear-gradient(135deg,var(--eth-blue),var(--eth-cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:flex;align-items:center;gap:8px}
.logo .logo-icon{font-size:1.8rem}
.nav-links{display:flex;list-style:none;gap:4px}
.nav-links a{color:var(--text-secondary);text-decoration:none;padding:8px 16px;border-radius:8px;font-size:.9rem;font-weight:500;transition:var(--transition);position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--white);background:rgba(98,126,234,.12)}
.mobile-menu-btn{display:none;background:none;border:none;color:var(--white);font-size:1.5rem;cursor:pointer;padding:8px}
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg-secondary);flex-direction:column;padding:16px;border-bottom:1px solid var(--border-color)}
  .nav-links.active{display:flex}
  .mobile-menu-btn{display:block}
}

/* ===== Container ===== */
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg,var(--white),var(--eth-blue-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}
.section-title p{color:var(--text-secondary);font-size:1.05rem;max-width:640px;margin:0 auto}

/* ===== Hero ===== */
.hero{min-height:100vh;display:flex;align-items:center;padding-top:64px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(ellipse at 30% 50%,rgba(98,126,234,.08) 0%,transparent 60%),radial-gradient(ellipse at 70% 20%,rgba(0,212,170,.06) 0%,transparent 50%);pointer-events:none}
.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;position:relative;z-index:1}
.hero-content h1{font-size:3rem;font-weight:900;line-height:1.2;margin-bottom:16px}
.hero-content h1 .gradient-text{background:linear-gradient(135deg,var(--eth-blue),var(--eth-cyan),var(--green));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradientShift 3s ease infinite;background-size:200% 200%}
.hero-content .subtitle{font-size:1.15rem;color:var(--text-secondary);margin-bottom:32px;max-width:500px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-image{display:flex;justify-content:center;align-items:center}
.hero-image img{max-width:100%;height:auto;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}
@media(max-width:1024px){
  .hero .container{grid-template-columns:1fr;text-align:center}
  .hero-content .subtitle{margin:0 auto 32px}
  .hero-btns{justify-content:center}
  .hero-image{order:-1}
}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:50px;font-size:1rem;font-weight:600;text-decoration:none;cursor:pointer;border:none;transition:var(--transition);white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--green),var(--eth-cyan));color:var(--white);box-shadow:0 4px 16px rgba(16,185,129,.3);animation:pulse 2s infinite}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(16,185,129,.4)}
.btn-secondary{background:rgba(255,255,255,.08);color:var(--white);border:1px solid var(--border-color)}
.btn-secondary:hover{background:rgba(255,255,255,.14);transform:translateY(-2px)}
.btn-eth{background:linear-gradient(135deg,var(--eth-blue),var(--nft-purple));color:var(--white);box-shadow:0 4px 16px rgba(98,126,234,.3)}
.btn-eth:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(98,126,234,.4)}
.btn-gold{background:linear-gradient(135deg,var(--gold),var(--gold-light));color:#1a1a1a;font-weight:700}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(245,158,11,.4)}
.btn-outline{background:transparent;color:var(--eth-blue);border:2px solid var(--eth-blue)}
.btn-outline:hover{background:rgba(98,126,234,.1)}

/* ===== Steps ===== */
.steps-section{background:var(--bg-secondary)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:36px 24px;text-align:center;border:1px solid var(--border-color);transition:var(--transition);position:relative;overflow:hidden}
.step-card:hover{transform:translateY(-6px);border-color:var(--eth-blue);box-shadow:0 12px 40px rgba(98,126,234,.15)}
.step-number{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:50%;font-size:1.5rem;font-weight:800;margin-bottom:20px}
.step-card:nth-child(1) .step-number{background:linear-gradient(135deg,var(--green),var(--eth-cyan));color:var(--white)}
.step-card:nth-child(2) .step-number{background:linear-gradient(135deg,var(--eth-blue),var(--nft-purple));color:var(--white)}
.step-card:nth-child(3) .step-number{background:linear-gradient(135deg,var(--gold),var(--gold-light));color:#1a1a1a}
.step-card h3{font-size:1.2rem;font-weight:700;color:var(--white);margin-bottom:8px}
.step-card p{color:var(--text-secondary);font-size:.95rem}
.step-progress{height:4px;background:linear-gradient(90deg,var(--green),var(--eth-cyan),var(--eth-blue));border-radius:2px;margin-top:16px;animation:progressFill 2s ease-out forwards}
@media(max-width:768px){.steps-grid{grid-template-columns:1fr}}

/* ===== Brands ===== */
.brands-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.brand-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;text-align:center;border:1px solid var(--border-color);transition:var(--transition)}
.brand-card:hover{border-color:var(--eth-cyan);transform:translateY(-4px)}
.brand-icon{font-size:3rem;margin-bottom:12px}
.brand-card h4{color:var(--white);font-size:1rem;margin-bottom:4px}
.brand-card span{color:var(--text-secondary);font-size:.85rem}
.brand-supported{display:inline-block;padding:4px 12px;background:rgba(16,185,129,.15);color:var(--green);border-radius:20px;font-size:.8rem;font-weight:600;margin-top:8px}
@media(max-width:768px){.brands-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.brands-grid{grid-template-columns:1fr}}

/* ===== Advantages ===== */
.advantages-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.advantage-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:32px 24px;border:1px solid var(--border-color);transition:var(--transition)}
.advantage-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.advantage-icon{font-size:2.5rem;margin-bottom:16px}
.advantage-card h3{font-size:1.15rem;font-weight:700;color:var(--white);margin-bottom:8px}
.advantage-card p{color:var(--text-secondary);font-size:.92rem}
@media(max-width:1024px){.advantages-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.advantages-grid{grid-template-columns:1fr}}

/* ===== NFT Showcase ===== */
.nft-section{background:linear-gradient(180deg,var(--bg-primary),rgba(139,92,246,.05),var(--bg-primary))}
.nft-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.nft-card{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-color);transition:var(--transition)}
.nft-card:hover{transform:translateY(-6px);border-color:var(--nft-purple);box-shadow:0 12px 40px rgba(139,92,246,.2)}
.nft-card img{width:100%;height:200px;object-fit:cover;display:block}
.nft-info{padding:16px}
.nft-info h4{color:var(--white);font-size:1rem;font-weight:700;margin-bottom:4px}
.nft-info .creator{color:var(--nft-purple-light);font-size:.85rem}
.nft-info .price{color:var(--eth-cyan);font-weight:700;margin-top:8px}
@media(max-width:1024px){.nft-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.nft-grid{grid-template-columns:1fr}}

/* ===== API Preview ===== */
.api-section{background:var(--bg-secondary)}
.api-preview{background:#0a0e1a;border-radius:var(--radius-lg);padding:32px;border:1px solid var(--border-color);overflow-x:auto;font-family:'Fira Code','Consolas',monospace;font-size:.9rem;line-height:1.8}
.api-preview .keyword{color:var(--nft-purple)}
.api-preview .string{color:var(--eth-cyan)}
.api-preview .comment{color:var(--text-secondary)}
.api-preview .func{color:var(--gold)}
.api-preview .url{color:var(--green)}

/* ===== CTA ===== */
.cta-section{text-align:center;padding:80px 0}
.cta-section h2{font-size:2.2rem;font-weight:800;color:var(--white);margin-bottom:16px;animation:glowPulse 3s infinite}
.cta-section p{color:var(--text-secondary);margin-bottom:32px;max-width:600px;margin-left:auto;margin-right:auto}
.cta-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===== About Page ===== */
.page-banner{min-height:40vh;display:flex;align-items:center;justify-content:center;text-align:center;position:relative;padding-top:64px}
.page-banner::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at center,rgba(98,126,234,.1) 0%,transparent 60%);pointer-events:none}
.page-banner h1{font-size:2.8rem;font-weight:900;background:linear-gradient(135deg,var(--white),var(--eth-blue-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-banner p{color:var(--text-secondary);font-size:1.1rem;max-width:600px;margin:12px auto 0}
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-content.reverse{direction:rtl}
.about-content.reverse>*{direction:ltr}
.about-text h3{font-size:1.5rem;font-weight:700;color:var(--white);margin-bottom:16px}
.about-text p{color:var(--text-secondary);margin-bottom:16px}
.about-image img{border-radius:var(--radius-lg);width:100%;box-shadow:var(--shadow-lg)}
.tech-features{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:24px}
.tech-feature{padding:16px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border-color)}
.tech-feature strong{color:var(--eth-cyan);display:block;margin-bottom:4px}
.tech-feature span{color:var(--text-secondary);font-size:.9rem}
.timeline{position:relative;padding:24px 0}
.timeline::before{content:'';position:absolute;left:24px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--eth-blue),var(--eth-cyan),var(--nft-purple))}
.timeline-item{position:relative;padding-left:60px;margin-bottom:32px}
.timeline-item::before{content:'';position:absolute;left:16px;top:4px;width:18px;height:18px;border-radius:50%;background:var(--eth-blue);border:3px solid var(--bg-primary)}
.timeline-item h4{color:var(--white);font-size:1.1rem}
.timeline-item .time{color:var(--eth-cyan);font-size:.85rem;font-weight:600}
.timeline-item p{color:var(--text-secondary)}
@media(max-width:768px){
  .about-content{grid-template-columns:1fr}
  .tech-features{grid-template-columns:1fr}
}

/* ===== Services Page ===== */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:36px 24px;border:1px solid var(--border-color);transition:var(--transition);text-align:center}
.service-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.service-card .service-icon{font-size:3rem;margin-bottom:20px}
.service-card h3{font-size:1.2rem;font-weight:700;color:var(--white);margin-bottom:12px}
.service-card p{color:var(--text-secondary);font-size:.92rem}
.service-card .service-tag{display:inline-block;padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:600;margin-top:12px}
.tag-hot{background:rgba(245,158,11,.15);color:var(--gold)}
.tag-new{background:rgba(0,212,170,.15);color:var(--eth-cyan)}
.tag-pro{background:rgba(139,92,246,.15);color:var(--nft-purple)}
.tag-free{background:rgba(16,185,129,.15);color:var(--green)}
@media(max-width:1024px){.services-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.services-grid{grid-template-columns:1fr}}

/* ===== FAQ Page ===== */
.faq-list{max-width:900px;margin:0 auto}
.faq-item{margin-bottom:12px}
.faq-item details{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);overflow:hidden;transition:var(--transition)}
.faq-item details:hover{border-color:var(--eth-blue)}
.faq-item summary{padding:20px 24px;cursor:pointer;font-weight:600;color:var(--white);font-size:1.05rem;list-style:none;display:flex;justify-content:space-between;align-items:center;user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'＋';font-size:1.3rem;color:var(--eth-blue);transition:var(--transition);flex-shrink:0;margin-left:16px}
.faq-item details[open] summary::after{content:'－';color:var(--eth-cyan)}
.faq-item details[open]{border-color:var(--eth-blue);box-shadow:0 4px 20px rgba(98,126,234,.1)}
.faq-item .faq-answer{padding:0 24px 20px;color:var(--text-secondary);font-size:.95rem;line-height:1.8}
.faq-item details[open] .faq-answer{animation:fadeIn .4s}

/* ===== Contact Page ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-form{background:var(--bg-card);padding:40px;border-radius:var(--radius-lg);border:1px solid var(--border-color)}
.contact-form h2{color:var(--white);margin-bottom:24px;font-size:1.5rem}
.form-group{margin-bottom:20px}
.form-group label{display:block;color:var(--text-secondary);margin-bottom:6px;font-size:.9rem;font-weight:500}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:14px 16px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius);color:var(--white);font-size:.95rem;transition:var(--transition);outline:none;font-family:inherit}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{border-color:var(--eth-blue);box-shadow:0 0 0 3px rgba(98,126,234,.15)}
.form-group textarea{resize:vertical;min-height:140px}
.contact-info-side{padding-top:20px}
.contact-info-side h2{color:var(--white);font-size:1.5rem;margin-bottom:24px}
.contact-info-card{background:var(--bg-card);padding:24px;border-radius:var(--radius);border:1px solid var(--border-color);margin-bottom:16px;transition:var(--transition)}
.contact-info-card:hover{border-color:var(--eth-cyan)}
.contact-info-card h4{color:var(--eth-cyan);margin-bottom:4px;font-size:.9rem;text-transform:uppercase;letter-spacing:1px}
.contact-info-card p,.contact-info-card a{color:var(--text-secondary);text-decoration:none;font-size:.95rem;display:block;word-break:break-all}
.contact-info-card a:hover{color:var(--eth-blue)}
.social-links{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}
.social-link{padding:10px 20px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:50px;color:var(--text-secondary);text-decoration:none;font-size:.9rem;transition:var(--transition)}
.social-link:hover{color:var(--white);border-color:var(--eth-blue);background:rgba(98,126,234,.1)}
@media(max-width:768px){.contact-grid{grid-template-columns:1fr}}

/* ===== Footer ===== */
.site-footer{background:var(--bg-secondary);border-top:1px solid var(--border-color);padding:40px 0 24px;text-align:center}
.footer-links{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;margin-bottom:20px}
.footer-links a{color:var(--text-secondary);text-decoration:none;font-size:.9rem;transition:var(--transition)}
.footer-links a:hover{color:var(--eth-blue)}
.footer-copyright{color:var(--text-secondary);font-size:.85rem}

/* ===== Back to Top ===== */
.back-to-top{position:fixed;bottom:32px;right:32px;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--eth-blue),var(--nft-purple));color:var(--white);border:none;cursor:pointer;font-size:1.3rem;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:var(--transition);z-index:999;box-shadow:var(--shadow)}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{transform:translateY(-4px)}

/* ===== Utility ===== */
.text-center{text-align:center}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-48{margin-top:48px}
.mb-24{margin-bottom:24px}
.mb-48{margin-bottom:48px}
.bg-secondary{background:var(--bg-secondary)}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:16px 0;color:var(--text-secondary);font-size:.85rem}
.breadcrumb a{color:var(--eth-blue);text-decoration:none}
.breadcrumb span{color:var(--text-secondary)}