/* ========== Reset & Base ========== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a2e;background:#f8f9fc;line-height:1.7;min-height:100vh}
a{color:#4a6cf7;text-decoration:none;transition:color .2s}
a:hover{color:#3651d5}
img{max-width:100%;height:auto}
.container{max-width:1100px;margin:0 auto;padding:0 20px}

/* ========== Header ========== */
header{background:#0f0f23;position:sticky;top:0;z-index:100;box-shadow:0 2px 12px rgba(0,0,0,.15)}
.header-container{max-width:1100px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:64px}
.logo a{display:flex;align-items:center;text-decoration:none}
.logo h1{font-size:1.6rem;color:#fff;font-weight:800;letter-spacing:1px}
nav ul{display:flex;list-style:none;gap:6px}
nav a{display:block;padding:8px 16px;color:#c0c0d8;font-size:.9rem;font-weight:500;border-radius:6px;transition:all .2s}
nav a:hover,nav a:focus{color:#fff;background:rgba(255,255,255,.1)}

/* ========== Page Banner ========== */
.page-banner{background:linear-gradient(135deg,#0f0f23 0%,#1a1a3e 50%,#0d1b3e 100%);color:#fff;padding:60px 0;text-align:center}
.page-banner h2,.page-banner h1{font-size:2.2rem;margin-bottom:12px;font-weight:700}
.page-banner p{font-size:1.05rem;color:#a0a0c8;max-width:600px;margin:0 auto}

/* ========== Hero Banner (首页) ========== */
.hero-banner{background:linear-gradient(135deg,#0f0f23 0%,#1e1e4a 40%,#0a1a4a 100%);color:#fff;padding:100px 0 80px;text-align:center;position:relative;overflow:hidden}
.hero-banner::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 30% 50%,rgba(74,108,247,.15) 0%,transparent 70%)}
.hero-banner .container{position:relative;z-index:1}
.hero-banner h2{font-size:2.5rem;font-weight:800;margin-bottom:20px;line-height:1.3}
.hero-banner p{font-size:1.1rem;color:#b0b0d8;max-width:700px;margin:0 auto 32px;line-height:1.8}
.btn-primary{display:inline-block;padding:14px 40px;background:linear-gradient(135deg,#4a6cf7,#6c8cff);color:#fff;font-size:1rem;font-weight:600;border-radius:8px;border:none;cursor:pointer;transition:all .3s;box-shadow:0 4px 15px rgba(74,108,247,.4)}
.btn-primary:hover{background:linear-gradient(135deg,#3651d5,#5a7cf7);color:#fff;transform:translateY(-1px);box-shadow:0 6px 20px rgba(74,108,247,.5)}

/* ========== Features (首页) ========== */
.features{padding:80px 0;background:#fff}
.features h2,.faq-section h2,.why-gmgn h2,.about-intro h2,.about-mission h2,.about-values h2,.about-timeline h2,.products-grid h2,.contact-intro h2,.contact-methods h2,.contact-faq h2,.sitemap-content h2{text-align:center;font-size:1.8rem;font-weight:700;margin-bottom:48px;color:#0f0f23;position:relative}
.features h2::after,.faq-section h2::after,.why-gmgn h2::after{content:'';display:block;width:50px;height:3px;background:linear-gradient(90deg,#4a6cf7,#6c8cff);margin:16px auto 0;border-radius:2px}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.feature-item{background:#f8f9fc;border:1px solid #e8ecf4;border-radius:12px;padding:32px 24px;transition:all .3s}
.feature-item:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.08);border-color:#c8d0e8}
.feature-item h3{font-size:1.15rem;color:#1a1a2e;margin-bottom:12px;font-weight:700}
.feature-item p{font-size:.95rem;color:#5a5a7a;line-height:1.7}

/* ========== FAQ (首页) ========== */
.faq-section{padding:80px 0;background:#f8f9fc}
.faq-item{margin-bottom:24px;background:#fff;border:1px solid #e8ecf4;border-radius:10px;overflow:hidden}
.faq-item h3{font-size:1.05rem;font-weight:600;padding:20px 24px;cursor:pointer;color:#1a1a2e;background:#fff;margin:0;transition:background .2s}
.faq-item h3:hover{background:#f0f3fb}
.faq-answer{padding:0 24px 24px}
.faq-answer p{margin-bottom:12px;font-size:.95rem;color:#4a4a6a;line-height:1.8}
.steps h4{font-size:.95rem;color:#4a6cf7;margin-bottom:8px}
.steps p strong{color:#1a1a2e}

/* ========== Why GMGN (首页) ========== */
.why-gmgn{padding:80px 0;background:#fff}
.why-gmgn ul{list-style:none;max-width:700px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.why-gmgn li{position:relative;padding:16px 20px 16px 40px;background:#f0f3fb;border-radius:8px;font-size:.95rem;color:#3a3a5a}
.why-gmgn li::before{content:'✓';position:absolute;left:16px;top:16px;color:#4a6cf7;font-weight:700}

/* ========== About Pages ========== */
.about-intro,.contact-intro,.sitemap-content{padding:60px 0;background:#fff}
.about-intro p,.contact-intro p{font-size:1rem;color:#4a4a6a;line-height:1.9;max-width:900px;margin:0 auto;text-align:justify}

.about-mission,.about-values,.about-timeline,.contact-methods,.contact-faq{padding:60px 0;background:#f8f9fc}
.about-values{background:#fff}
.about-timeline{background:#fff}

.mission-grid,.values-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.mission-item,.value-item{background:#fff;border:1px solid #e8ecf4;border-radius:10px;padding:28px 24px}
.mission-item h3,.value-item h3{font-size:1.1rem;color:#1a1a2e;margin-bottom:12px;font-weight:700}
.mission-item p,.value-item p{font-size:.95rem;color:#5a5a7a;line-height:1.8}

.timeline{max-width:800px;margin:0 auto;position:relative;padding-left:30px}
.timeline::before{content:'';position:absolute;left:12px;top:0;bottom:0;width:2px;background:#d8dce8}
.timeline-item{position:relative;margin-bottom:32px;padding-left:20px}
.timeline-item::before{content:'';position:absolute;left:-24px;top:6px;width:14px;height:14px;border-radius:50%;background:#4a6cf7;border:3px solid #fff;box-shadow:0 0 0 3px #4a6cf7}
.timeline-item h3{font-size:1.05rem;color:#1a1a2e;margin-bottom:8px;font-weight:700}
.timeline-item p{font-size:.93rem;color:#5a5a7a;line-height:1.8}

/* ========== Products ========== */
.products-grid{padding:60px 0;background:#fff}
.product-card{background:#f8f9fc;border:1px solid #e8ecf4;border-radius:12px;padding:32px;margin-bottom:24px;transition:all .3s}
.product-card:hover{box-shadow:0 4px 20px rgba(0,0,0,.06);border-color:#c8d0e8}
.product-card h3{font-size:1.2rem;color:#1a1a2e;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid #4a6cf7;display:inline-block}
.product-desc{font-size:.93rem;color:#4a4a6a;line-height:1.8;margin-bottom:10px}

/* ========== Contact ========== */
.contact-methods .container{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.contact-card{background:#fff;border:1px solid #e8ecf4;border-radius:10px;padding:28px 24px;transition:all .3s}
.contact-card:hover{box-shadow:0 4px 20px rgba(0,0,0,.06)}
.contact-card h3{font-size:1.1rem;color:#1a1a2e;margin-bottom:12px;font-weight:700}
.contact-card p{font-size:.93rem;color:#5a5a7a;line-height:1.7;margin-bottom:8px}
.contact-value{font-weight:600;color:#4a6cf7!important;background:#f0f3fb;padding:10px 14px;border-radius:6px;font-size:.9rem!important;word-break:break-all}
.contact-note{font-size:.82rem!important;color:#999!important;margin-top:8px}

/* ========== Sitemap ========== */
.sitemap-section{margin-bottom:36px}
.sitemap-section h3{font-size:1.1rem;color:#1a1a2e;margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid #e8ecf4}
.sitemap-section ul{list-style:none}
.sitemap-section li{padding:10px 0;border-bottom:1px dashed #e8ecf4}
.sitemap-section li:last-child{border-bottom:none}
.sitemap-section a{font-weight:600}
.sitemap-section span{color:#888;font-size:.9rem}

/* ========== Footer ========== */
footer{background:#0f0f23;color:#a0a0c8;padding:48px 0 32px}
.footer-container{max-width:1100px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:1fr 1fr;gap:40px}
.footer-links h4{font-size:1rem;color:#fff;margin-bottom:16px;font-weight:600}
.footer-links ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.footer-links a{color:#8088a8;font-size:.9rem;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-info{font-size:.85rem;line-height:2;color:#707090}
.footer-info a{color:#8088a8}
.footer-info a:hover{color:#fff}

/* ========== Responsive ========== */
@media(max-width:768px){
  .header-container{flex-direction:column;height:auto;padding:12px 20px;gap:12px}
  nav ul{flex-wrap:wrap;justify-content:center}
  .hero-banner{padding:60px 0 50px}
  .hero-banner h2{font-size:1.6rem}
  .hero-banner p{font-size:.95rem}
  .page-banner h2{font-size:1.6rem}
  .feature-grid,.mission-grid,.values-grid{grid-template-columns:1fr}
  .footer-container{grid-template-columns:1fr;gap:24px}
  .contact-methods .container{grid-template-columns:1fr}
  .timeline{padding-left:20px}
  .features h2,.faq-section h2,.why-gmgn h2,.about-intro h2,.about-mission h2,.about-values h2,.about-timeline h2,.products-grid h2,.contact-intro h2,.contact-methods h2,.contact-faq h2,.sitemap-content h2{font-size:1.4rem}
}