/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.6;color:#fff;background:#0A0A0A;-webkit-font-smoothing:antialiased;}
ul{list-style:none;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
button,input,textarea{font:inherit;}

/* ===== CSS Variables ===== */
:root{
  --primary:#FF2D2D;
  --secondary:#007BFF;
  --bg-dark:#0A0A0A;
  --bg-light:#FFFFFF;
  --surface-dark:#1A1A1A;
  --surface-mid:#F5F5F5;
  --text-primary:#FFFFFF;
  --text-secondary:#CCCCCC;
  --border-strong:#333333;
  --metal-silver:#C0C0C0;
  --font-headline:Impact,'Arial Black',sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --container-max:1200px;
  --header-height:70px;
}

/* ===== Container ===== */
.container{max-width:var(--container-max);margin:0 auto;padding:0 20px;}

/* ===== Skip Link ===== */
.skip-link{
  position:absolute;top:-100px;left:0;z-index:10000;padding:8px 16px;background:var(--primary);color:#fff;font-weight:bold;transition:top 0.3s;
}
.skip-link:focus{top:0;}

/* ===== Header ===== */
.site-header{
  position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(10,10,10,0.95);backdrop-filter:blur(6px);border-bottom:2px solid var(--border-strong);height:var(--header-height);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;height:100%;gap:20px;
}
.brand{display:flex;align-items:center;gap:8px;font-size:24px;font-weight:bold;font-family:var(--font-headline);color:var(--primary);letter-spacing:-1px;}
.brand-icon{font-size:30px;line-height:1;}
.nav-wrap{flex:1;display:flex;justify-content:center;}
.nav-list{display:flex;gap:4px;}
.nav-item{position:relative;}
.nav-link{
  display:block;padding:8px 16px;font-size:14px;font-weight:600;color:var(--text-secondary);border-radius:50px;transition:all 0.3s;position:relative;overflow:hidden;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--text-primary);background:rgba(255,255,255,0.05);}
.nav-link[aria-current="page"]{color:var(--primary);}
.nav-link[aria-current="page"]::after{
  content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60%;height:3px;background:var(--primary);border-radius:2px;
}
.cta-button{
  background:var(--primary);color:#fff;padding:10px 24px;border-radius:50px;font-weight:bold;font-size:14px;transition:transform 0.3s,box-shadow 0.3s;white-space:nowrap;border:2px solid transparent;
}
.cta-button:hover,.cta-button:focus-visible{transform:scale(1.05);box-shadow:0 0 15px rgba(255,45,45,0.4);border-color:var(--text-primary);}

/* ===== Mobile Nav Toggle ===== */
.nav-toggle{display:none;background:none;border:2px solid var(--metal-silver);border-radius:8px;width:44px;height:44px;cursor:pointer;position:relative;transition:border-color 0.3s;}
.nav-toggle .toggle-icon,.nav-toggle .toggle-icon::before,.nav-toggle .toggle-icon::after{display:block;width:24px;height:2px;background:var(--text-primary);transition:all 0.3s;position:absolute;left:50%;transform:translateX(-50%);}
.nav-toggle .toggle-icon{top:50%;transform:translate(-50%,-50%);}
.nav-toggle .toggle-icon::before{content:'';top:-8px;}
.nav-toggle .toggle-icon::after{content:'';top:8px;}
.nav-toggle[aria-expanded="true"] .toggle-icon{background:transparent;}
.nav-toggle[aria-expanded="true"] .toggle-icon::before{top:0;transform:translate(-50%,-50%) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .toggle-icon::after{top:0;transform:translate(-50%,-50%) rotate(-45deg);}

@media (max-width:768px){
  .nav-toggle{display:block;}
  .nav-wrap{
    position:fixed;top:var(--header-height);left:0;width:100%;height:calc(100vh - var(--header-height));background:rgba(10,10,10,0.98);flex-direction:column;align-items:center;justify-content:flex-start;padding:40px 20px;transform:translateX(100%);transition:transform 0.4s ease;overflow-y:auto;
  }
  .nav-list{flex-direction:column;gap:8px;width:100%;max-width:400px;}
  .nav-link{font-size:18px;padding:12px 24px;text-align:center;border-radius:12px;}
  .site-header[data-open] .nav-wrap{transform:translateX(0);}
  .cta-button{display:none;}
}

/* ===== Footer ===== */
.site-footer{
  background:var(--surface-dark);border-top:3px solid var(--primary);padding:60px 20px 30px;margin-top:80px;
}
.footer-inner{display:grid;grid-template-columns:1fr 1fr 1fr;gap:40px;align-items:start;}
.footer-brand{font-family:var(--font-headline);font-size:28px;color:var(--primary);display:flex;align-items:center;gap:10px;}
.footer-contact p{margin-bottom:6px;font-size:14px;color:var(--text-secondary);}
.footer-contact a{color:var(--secondary);}
.footer-links{display:flex;flex-direction:column;gap:12px;}
.footer-links a{color:var(--text-secondary);font-size:15px;transition:color 0.3s;padding:4px 0;}
.footer-links a:hover,.footer-links a:focus-visible{color:var(--primary);}
.footer-icp{grid-column:1 / -1;text-align:center;margin-top:20px;font-size:12px;color:var(--text-secondary);border-top:1px solid var(--border-strong);padding-top:20px;}
.footer-trust{grid-column:1 / -1;text-align:center;font-size:13px;color:var(--text-secondary);margin-top:10px;line-height:1.4;}
@media (max-width:768px){
  .footer-inner{grid-template-columns:1fr;text-align:center;gap:30px;}
  .footer-brand{justify-content:center;}
  .footer-links{align-items:center;}
}

/* ===== General Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;border-radius:50px;font-weight:bold;font-size:15px;cursor:pointer;border:2px solid transparent;transition:all 0.3s;
}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary);}
.btn-primary:hover,.btn-primary:focus-visible{background:transparent;color:var(--primary);border-color:var(--primary);transform:scale(1.03);}
.btn-secondary{background:transparent;color:var(--primary);border:2px solid var(--primary);}
.btn-secondary:hover,.btn-secondary:focus-visible{background:var(--primary);color:#fff;}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:12px 0;font-size:14px;color:var(--text-secondary);display:flex;flex-wrap:wrap;gap:4px;}
.breadcrumb a{color:var(--secondary);}
.breadcrumb a:hover{text-decoration:underline;}
.breadcrumb .current{color:var(--text-primary);}

/* ===== Cards ===== */
.card{
  background:var(--surface-dark);border:3px solid var(--border-strong);border-radius:12px;padding:24px;box-shadow:0 8px 20px rgba(0,0,0,0.5);transition:transform 0.3s,box-shadow 0.3s;
}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(255,45,45,0.15);}

/* ===== Section Title ===== */
.section-title{
  font-family:var(--font-headline);font-size:32px;color:var(--text-primary);margin-bottom:20px;display:flex;align-items:center;gap:15px;
}
.section-title::after{content:'';flex:1;height:2px;background:linear-gradient(90deg,var(--primary),transparent);}

/* ===== Speed Line Decoration ===== */
.speed-line{position:relative;overflow:hidden;}
.speed-line::before{
  content:'';position:absolute;top:50%;left:-20%;width:140%;height:2px;background:linear-gradient(90deg,transparent,var(--metal-silver),transparent);transform:rotate(-10deg);opacity:0.3;pointer-events:none;
}

/* ===== Image Container Base ===== */
.image-wrapper{position:relative;overflow:hidden;background:var(--surface-dark);aspect-ratio:16/9;border:2px solid var(--border-strong);}
.image-wrapper img{width:100%;height:100%;object-fit:cover;}

/* ===== Responsive ===== */
@media (max-width:480px){
  :root{--header-height:60px;}
  .brand{font-size:20px;}
  .brand-icon{font-size:24px;}
}
@media (min-width:769px){
  .site-header[data-open] .nav-wrap{display:flex;} /* override mobile */
}

/* ===== Focus & Reduced Motion ===== */
:focus-visible{outline:3px solid var(--primary);outline-offset:2px;}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important;}
  .cta-button:hover{transform:none!important;}
  .card:hover{transform:none!important;}
  .nav-link[aria-current="page"]::after{transition:none;}
}