/* Guiyan Deep Space Design System */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{overflow-x:hidden;max-width:100%;scroll-behavior:smooth}
img{max-width:100%;height:auto}

:root{
  --cyan:#00dfff;
  --hero-bg:#070d2a;
  --dark-navy:#1a1e3a;
  --light-bg:#f6fbfe;
  --body-text:#373b59;
  --white:#ffffff;
  --card-shadow:0 0 20px 0 rgba(20,19,48,0.07);
  --card-shadow-light:0 0 30px 0 rgb(244,245,252);
  --radius-sm:4px;
  --radius-md:6px;
  --radius-lg:16px;
  --font-main:"PingFang SC","PingFangSC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",sans-serif;
}

body{font-family:var(--font-main);font-size:16px;line-height:1.6;color:var(--body-text);background:#fff}

/* ── HEADER / NAV ── */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(7,13,42,0.97);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(0,223,255,0.12);
}
.nav{
  max-width:1200px;margin:0 auto;
  padding:0 24px;height:64px;
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;
}
.nav-logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.nav-logo img{height:36px;width:auto}
.nav-logo span{color:var(--white);font-size:18px;font-weight:600;letter-spacing:0.02em}

.nav-links{display:flex;align-items:center;gap:8px;list-style:none}
.nav-links a{
  color:rgba(255,255,255,0.82);font-size:15px;font-weight:500;
  text-decoration:none;padding:8px 14px;border-radius:var(--radius-md);
  transition:color .2s,background .2s;white-space:nowrap;
}
.nav-links a:hover{color:var(--cyan);background:rgba(0,223,255,0.08)}
.nav-links a.active{color:var(--cyan)}

/* Language switcher */
.lang-switcher{position:relative;display:flex;align-items:center}
.lang-btn{
  background:none;border:1px solid rgba(0,223,255,0.35);
  color:rgba(255,255,255,0.85);font-size:13px;font-weight:500;
  padding:6px 12px;border-radius:var(--radius-md);cursor:pointer;
  display:flex;align-items:center;gap:5px;transition:border-color .2s,color .2s;
  font-family:var(--font-main);white-space:nowrap;
}
.lang-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.lang-btn .arrow{font-size:10px;transition:transform .2s;display:inline-block}
.lang-btn.open .arrow{transform:rotate(180deg)}
.lang-dropdown{
  position:absolute;top:calc(100% + 8px);right:0;
  background:#0f1635;border:1px solid rgba(0,223,255,0.2);
  border-radius:var(--radius-md);overflow:hidden;
  min-width:120px;box-shadow:0 8px 32px rgba(0,0,0,0.4);
  display:none;z-index:2000;
}
.lang-dropdown.open{display:block}
.lang-dropdown a{
  display:block;padding:10px 16px;color:rgba(255,255,255,0.82);
  text-decoration:none;font-size:14px;font-weight:500;
  transition:background .15s,color .15s;white-space:nowrap;
}
.lang-dropdown a:hover{background:rgba(0,223,255,0.12);color:var(--cyan)}
.lang-dropdown a.active{color:var(--cyan);background:rgba(0,223,255,0.08)}

.nav-cta{
  background:var(--cyan);color:var(--hero-bg) !important;
  font-weight:600 !important;padding:9px 20px !important;
  border-radius:var(--radius-md);white-space:nowrap;
  transition:opacity .2s !important;
}
.nav-cta:hover{opacity:.85;background:var(--cyan) !important;color:var(--hero-bg) !important}

.nav-toggle{
  display:none;background:none;border:0;
  color:var(--white);font-size:26px;cursor:pointer;
  padding:4px 8px;margin-left:auto;flex-shrink:0;line-height:1;
}

/* ── MOBILE NAV ── */
@media(max-width:768px){
  .nav-toggle{display:block}
  .nav-desktop{display:none}
  .nav-links{
    display:none;flex-direction:column;align-items:center;
    position:fixed;inset:64px 0 0 0;width:100vw;
    background:rgba(7,13,42,0.98);
    backdrop-filter:blur(16px);
    padding:32px 24px 40px;gap:4px;
    overflow-y:auto;z-index:999;
  }
  .nav-links.open{display:flex}
  .nav-links li{width:100%;text-align:center}
  .nav-links a{
    display:block;width:100%;padding:14px 0;
    font-size:18px;border-radius:var(--radius-lg);
  }
  .nav-links a.nav-cta{
    margin-top:8px;display:block;
    padding:14px 0 !important;font-size:17px !important;
    background:var(--cyan);color:var(--hero-bg) !important;
    border-radius:var(--radius-md);
  }
  /* mobile lang switcher inside menu */
  .lang-switcher{width:100%;justify-content:center;margin-top:12px}
  .lang-btn{font-size:15px;padding:10px 20px}
  .lang-dropdown{
    position:static;display:none;background:rgba(0,223,255,0.06);
    border:1px solid rgba(0,223,255,0.2);border-radius:var(--radius-md);
    margin-top:6px;width:100%;box-shadow:none;
  }
  .lang-dropdown.open{display:block}
  .lang-dropdown a{text-align:center;padding:12px 16px;font-size:16px}
}

/* ── HERO ── */
.hero{
  background:var(--hero-bg);
  background-image:url('../images/hero-bg.jpg');
  background-size:cover;background-position:center;
  position:relative;overflow:hidden;
  padding:96px 24px 80px;
  min-height:600px;display:flex;align-items:center;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(7,13,42,0.92) 40%,rgba(26,30,58,0.80) 100%);
}
/* starfield dots */
.hero::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background-image:
    radial-gradient(1px 1px at 15% 25%,rgba(0,223,255,0.6) 0%,transparent 100%),
    radial-gradient(1px 1px at 70% 15%,rgba(255,255,255,0.5) 0%,transparent 100%),
    radial-gradient(1.5px 1.5px at 40% 60%,rgba(0,223,255,0.4) 0%,transparent 100%),
    radial-gradient(1px 1px at 85% 45%,rgba(255,255,255,0.4) 0%,transparent 100%),
    radial-gradient(1px 1px at 55% 80%,rgba(0,223,255,0.3) 0%,transparent 100%),
    radial-gradient(2px 2px at 20% 70%,rgba(255,255,255,0.3) 0%,transparent 100%);
}
.hero-inner{
  position:relative;z-index:1;
  max-width:1200px;margin:0 auto;width:100%;
  display:flex;flex-direction:column;align-items:center;text-align:center;
}
.hero h1{
  font-size:54px;font-weight:500;line-height:1.38;
  color:var(--white);margin-bottom:20px;
}
.hero h1 .accent{color:var(--cyan)}
.hero p.sub{
  font-size:18px;line-height:1.7;color:rgba(255,255,255,0.78);
  max-width:640px;margin:0 auto 36px;
}
.hero-badges{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:32px}
.badge{
  background:rgba(0,223,255,0.12);border:1px solid rgba(0,223,255,0.28);
  color:rgba(255,255,255,0.88);font-size:13px;font-weight:500;
  padding:6px 14px;border-radius:100px;
}
.btn-primary{
  display:inline-block;background:var(--cyan);color:var(--hero-bg);
  font-size:17px;font-weight:600;text-decoration:none;
  padding:16px 40px;border-radius:var(--radius-md);
  transition:opacity .2s,transform .15s;letter-spacing:0.02em;
  border:none;cursor:pointer;font-family:var(--font-main);
}
.btn-primary:hover{opacity:.88;transform:translateY(-1px)}
.btn-secondary{
  display:inline-block;background:transparent;
  color:var(--white);font-size:16px;font-weight:500;
  text-decoration:none;padding:14px 32px;border-radius:var(--radius-md);
  border:1px solid rgba(255,255,255,0.3);transition:border-color .2s,background .2s;
}
.btn-secondary:hover{border-color:var(--cyan);background:rgba(0,223,255,0.08)}
.hero-ctas{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ── SECTIONS ── */
.section{padding:72px 24px}
.section-light{background:var(--light-bg)}
.section-dark{background:var(--dark-navy)}
.section-darker{background:var(--hero-bg)}
.container{max-width:1200px;margin:0 auto}

.section-tag{
  display:inline-block;font-size:13px;font-weight:600;
  color:var(--cyan);text-transform:uppercase;letter-spacing:0.1em;
  margin-bottom:12px;
}
.section-title{
  font-size:40px;font-weight:500;line-height:1.4;
  color:var(--dark-navy);margin-bottom:16px;
}
.section-dark .section-title,.section-darker .section-title{color:var(--white)}
.section-sub{font-size:16px;line-height:1.88;color:rgba(55,59,89,0.7);max-width:600px}
.section-dark .section-sub,.section-darker .section-sub{color:rgba(255,255,255,0.65)}
.section-head{text-align:center;margin-bottom:56px}

/* ── STATS STRIP ── */
.stats{background:var(--dark-navy);padding:48px 24px}
.stats-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:repeat(4,1fr);gap:32px;
}
.stat-item{text-align:center}
.stat-num{font-size:42px;font-weight:600;color:var(--cyan);display:block;line-height:1.1}
.stat-label{font-size:14px;color:rgba(255,255,255,0.65);margin-top:6px}

/* ── FEATURES GRID ── */
.features-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;
}
.feature-card{
  background:#fff;border-radius:var(--radius-lg);
  padding:32px;box-shadow:var(--card-shadow);
  transition:transform .2s,box-shadow .2s;
  display:flex;flex-direction:column;gap:16px;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(20,19,48,0.12)}
.feature-card .icon-wrap{
  width:56px;height:56px;border-radius:var(--radius-md);
  background:linear-gradient(135deg,rgba(0,223,255,0.15),rgba(0,223,255,0.05));
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
  overflow:hidden;
}
.feature-card .icon-wrap img{width:40px;height:40px;object-fit:cover;border-radius:4px}
.feature-card h3{font-size:20px;font-weight:500;line-height:1.4;color:var(--dark-navy)}
.feature-card p{font-size:14px;line-height:1.71;color:rgba(55,59,89,0.72);flex:1}

/* ── IMAGE + TEXT ── */
.split-section{
  display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;
}
.split-section.reverse{direction:rtl}
.split-section.reverse>*{direction:ltr}
.split-img{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--card-shadow)}
.split-img img{width:100%;height:320px;object-fit:cover;display:block}
.split-text .section-tag{display:block;margin-bottom:16px}
.split-text h2{font-size:36px;font-weight:500;color:var(--dark-navy);margin-bottom:16px;line-height:1.35}
.split-text p{font-size:16px;line-height:1.88;color:rgba(55,59,89,0.78);margin-bottom:24px}
.check-list{list-style:none;display:flex;flex-direction:column;gap:10px}
.check-list li{display:flex;align-items:flex-start;gap:10px;font-size:15px;color:var(--body-text)}
.check-list li::before{content:"✓";color:var(--cyan);font-weight:700;flex-shrink:0;margin-top:1px}

/* ── ADVANTAGE CARDS ── */
.advantage-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:24px;
}
.advantage-card{
  background:rgba(255,255,255,0.04);border:1px solid rgba(0,223,255,0.12);
  border-radius:var(--radius-lg);padding:28px;
  display:flex;gap:20px;align-items:flex-start;
  transition:background .2s,border-color .2s;
}
.advantage-card:hover{background:rgba(0,223,255,0.06);border-color:rgba(0,223,255,0.3)}
.adv-icon{width:48px;height:48px;flex-shrink:0;border-radius:var(--radius-md);overflow:hidden}
.adv-icon img{width:100%;height:100%;object-fit:cover}
.adv-body h3{font-size:18px;font-weight:500;color:var(--white);margin-bottom:8px}
.adv-body p{font-size:14px;line-height:1.71;color:rgba(255,255,255,0.6)}

/* ── TESTIMONIALS ── */
.testimonials-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.testimonial-card{
  background:#fff;border-radius:var(--radius-lg);padding:28px;
  box-shadow:var(--card-shadow);display:flex;flex-direction:column;gap:12px;
}
.t-stars{color:var(--cyan);font-size:16px;letter-spacing:2px}
.t-text{font-size:14px;line-height:1.71;color:rgba(55,59,89,0.82);flex:1}
.t-author{font-size:13px;font-weight:600;color:var(--dark-navy)}
.t-country{font-size:12px;color:rgba(55,59,89,0.5)}

/* ── PRICING ── */
.pricing-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;align-items:start;
}
.pricing-card{
  background:#fff;border-radius:var(--radius-lg);padding:36px 28px;
  box-shadow:var(--card-shadow);position:relative;
  border:2px solid transparent;transition:border-color .2s;
}
.pricing-card.featured{border-color:var(--cyan)}
.pricing-badge{
  position:absolute;top:-14px;left:50%;transform:translateX(-50%);
  background:var(--cyan);color:var(--hero-bg);font-size:12px;font-weight:700;
  padding:4px 16px;border-radius:100px;white-space:nowrap;
}
.pricing-name{font-size:20px;font-weight:600;color:var(--dark-navy);margin-bottom:8px}
.pricing-price{font-size:48px;font-weight:700;color:var(--hero-bg);line-height:1;margin-bottom:4px}
.pricing-price span{font-size:16px;font-weight:400;color:rgba(55,59,89,0.6)}
.pricing-desc{font-size:14px;color:rgba(55,59,89,0.65);margin-bottom:24px;line-height:1.5}
.pricing-features{list-style:none;display:flex;flex-direction:column;gap:10px;margin-bottom:28px}
.pricing-features li{font-size:14px;color:var(--body-text);display:flex;align-items:center;gap:8px}
.pricing-features li::before{content:"✓";color:var(--cyan);font-weight:700;flex-shrink:0}
.btn-pricing{
  display:block;width:100%;text-align:center;
  padding:14px;border-radius:var(--radius-md);font-size:16px;font-weight:600;
  text-decoration:none;transition:opacity .2s;font-family:var(--font-main);
}
.btn-pricing.primary{background:var(--cyan);color:var(--hero-bg)}
.btn-pricing.outline{background:transparent;border:1.5px solid var(--cyan);color:var(--cyan)}
.btn-pricing:hover{opacity:.85}

/* ── CTA BANNER ── */
.cta-banner{
  background:linear-gradient(135deg,var(--hero-bg) 0%,var(--dark-navy) 100%);
  padding:72px 24px;text-align:center;
}
.cta-banner h2{font-size:40px;font-weight:500;color:var(--white);margin-bottom:16px}
.cta-banner p{font-size:18px;color:rgba(255,255,255,0.7);margin-bottom:36px;max-width:560px;margin-left:auto;margin-right:auto}

/* ── PLATFORMS ── */
.platforms-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.platform-card{
  background:#fff;border-radius:var(--radius-lg);padding:28px 20px;
  text-align:center;box-shadow:var(--card-shadow);
  transition:transform .2s;text-decoration:none;
}
.platform-card:hover{transform:translateY(-3px)}
.platform-card .p-icon{font-size:40px;margin-bottom:12px;display:block}
.platform-card h3{font-size:16px;font-weight:600;color:var(--dark-navy);margin-bottom:6px}
.platform-card p{font-size:13px;color:rgba(55,59,89,0.65)}

/* ── FOOTER ── */
.site-footer{background:var(--hero-bg);padding:56px 24px 32px;border-top:1px solid rgba(0,223,255,0.1)}
.footer-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;
  margin-bottom:48px;
}
.footer-brand img{height:36px;width:auto;margin-bottom:16px}
.footer-brand p{font-size:14px;line-height:1.71;color:rgba(255,255,255,0.55);max-width:280px}
.footer-col h4{font-size:14px;font-weight:600;color:var(--white);margin-bottom:16px;letter-spacing:0.05em;text-transform:uppercase}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,0.55);text-decoration:none;padding:4px 0;transition:color .15s}
.footer-col a:hover{color:var(--cyan)}
.footer-bottom{
  max-width:1200px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;
  border-top:1px solid rgba(255,255,255,0.08);padding-top:24px;
}
.footer-bottom p{font-size:13px;color:rgba(255,255,255,0.4)}
.footer-bottom .footer-lang{display:flex;gap:16px}
.footer-bottom .footer-lang a{font-size:13px;color:rgba(255,255,255,0.5);text-decoration:none;transition:color .15s}
.footer-bottom .footer-lang a:hover,.footer-bottom .footer-lang a.active{color:var(--cyan)}

/* ── INNER PAGE HERO ── */
.page-hero{
  background:var(--hero-bg);padding:72px 24px 56px;
  border-bottom:1px solid rgba(0,223,255,0.1);text-align:center;
}
.page-hero h1{font-size:44px;font-weight:500;color:var(--white);margin-bottom:14px;line-height:1.3}
.page-hero p{font-size:18px;color:rgba(255,255,255,0.68);max-width:600px;margin:0 auto}

/* ── PROSE ── */
.prose{max-width:800px;margin:0 auto}
.prose h2{font-size:28px;font-weight:600;color:var(--dark-navy);margin:40px 0 14px}
.prose h3{font-size:20px;font-weight:600;color:var(--dark-navy);margin:28px 0 10px}
.prose p{font-size:16px;line-height:1.88;color:rgba(55,59,89,0.85);margin-bottom:16px}
.prose ul{padding-left:24px;margin-bottom:16px}
.prose ul li{font-size:15px;line-height:1.7;color:rgba(55,59,89,0.82);margin-bottom:8px}
.prose a{color:var(--cyan);text-decoration:none}
.prose a:hover{text-decoration:underline}

/* ── CONTACT ── */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.contact-info h2{font-size:32px;font-weight:500;color:var(--dark-navy);margin-bottom:16px}
.contact-info p{font-size:16px;line-height:1.88;color:rgba(55,59,89,0.78);margin-bottom:28px}
.contact-item{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.contact-item .ci-icon{font-size:24px;width:44px;text-align:center;flex-shrink:0}
.contact-item p{font-size:15px;color:var(--body-text);margin:0}
.contact-form{background:#fff;border-radius:var(--radius-lg);padding:36px;box-shadow:var(--card-shadow)}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:14px;font-weight:500;color:var(--dark-navy);margin-bottom:6px}
.form-group input,.form-group textarea,.form-group select{
  width:100%;padding:12px 14px;font-family:var(--font-main);
  border:1.5px solid rgba(55,59,89,0.18);border-radius:var(--radius-md);
  font-size:15px;color:var(--dark-navy);background:#fff;outline:none;
  transition:border-color .2s;
}
.form-group input:focus,.form-group textarea:focus{border-color:var(--cyan)}
.form-group textarea{min-height:120px;resize:vertical}
.form-submit{
  display:block;width:100%;padding:14px;background:var(--cyan);
  color:var(--hero-bg);font-size:16px;font-weight:600;
  border:none;border-radius:var(--radius-md);cursor:pointer;
  font-family:var(--font-main);transition:opacity .2s;
}
.form-submit:hover{opacity:.85}

/* ── FAQ ── */
.faq-list{display:flex;flex-direction:column;gap:16px}
.faq-item{
  background:#fff;border-radius:var(--radius-lg);
  border:1px solid rgba(55,59,89,0.1);overflow:hidden;
}
.faq-q{
  width:100%;text-align:left;background:none;border:0;
  padding:20px 24px;font-family:var(--font-main);
  font-size:16px;font-weight:500;color:var(--dark-navy);
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  gap:12px;
}
.faq-q .faq-arrow{font-size:18px;transition:transform .2s;flex-shrink:0}
.faq-q.open .faq-arrow{transform:rotate(180deg)}
.faq-a{display:none;padding:0 24px 20px;font-size:15px;line-height:1.7;color:rgba(55,59,89,0.78)}
.faq-a.open{display:block}

/* ── RESPONSIVE ── */
@media(max-width:992px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .pricing-grid{grid-template-columns:1fr;max-width:420px;margin:0 auto}
  .footer-grid{grid-template-columns:1fr 1fr}
  .platforms-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .hero h1{font-size:34px}
  .hero{padding:64px 20px 56px;min-height:auto}
  .section{padding:52px 20px}
  .section-title{font-size:28px}
  .features-grid{grid-template-columns:1fr}
  .advantage-grid{grid-template-columns:1fr}
  .testimonials-grid{grid-template-columns:1fr}
  .split-section{grid-template-columns:1fr;direction:ltr}
  .split-section.reverse{direction:ltr}
  .contact-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
  .page-hero h1{font-size:32px}
  .cta-banner h2{font-size:28px}
}
@media(max-width:480px){
  .hero h1{font-size:28px}
  .stats-grid{grid-template-columns:1fr 1fr}
  .stat-num{font-size:32px}
  .pricing-grid{max-width:100%}
  .platforms-grid{grid-template-columns:1fr 1fr}
}