*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;line-height:1.6}
:root{
  --color-primary:#C8102E;
  --color-secondary:#1A1A1A;
  --color-accent1:#B0B0B0;
  --color-accent2:#7F3FBF;
  --gradient-start:#C8102E;
  --gradient-end:#7F3FBF;
  --text-primary:#FFFFFF;
  --text-secondary:#B0B0B0;
  --bg-light:#F5F5F5;
  --font-heading:'Inter','Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --max-width:1200px;
  --header-top-h:48px;
  --header-bottom-h:64px;
  --shadow-card:0 2px 12px rgba(0,0,0,0.15);
  --radius:8px;
  --transition:0.3s cubic-bezier(0.25,0.46,0.45,0.94)
}
body{font-family:var(--font-body);color:var(--text-primary);background:var(--color-secondary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:var(--color-primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--gradient-end)}
a:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:4px}
:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:4px}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.skip-link{position:absolute;top:-100%;left:0;z-index:1000;padding:12px 24px;background:var(--color-primary);color:var(--text-primary);font-weight:700;transition:top 0.3s}
.skip-link:focus{top:0}
.site-header{position:sticky;top:0;z-index:900;background:var(--color-secondary);border-bottom:1px solid rgba(176,176,176,0.2)}
.header-top{border-bottom:1px solid rgba(176,176,176,0.12);height:var(--header-top-h);display:flex;align-items:center;background:rgba(26,26,26,0.98)}
.header-top-inner{max-width:var(--max-width);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;width:100%;height:100%}
.brand{font-family:var(--font-heading);font-weight:800;font-size:1.25rem;color:var(--text-primary);letter-spacing:0.5px;transition:color var(--transition);display:flex;align-items:center;gap:8px}
.brand:hover{color:var(--color-primary)}
.header-tagline{font-size:0.8rem;color:var(--text-secondary);letter-spacing:1px;font-weight:400;display:none}
@media(min-width:640px){.header-tagline{display:inline}}
.header-bottom{height:var(--header-bottom-h);display:flex;align-items:center;background:linear-gradient(135deg,rgba(26,26,26,0.98) 60%,rgba(200,16,46,0.08) 100%);position:relative}
.header-bottom::after{content:'';position:absolute;bottom:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--gradient-start),var(--gradient-end));transform:skewX(-12deg);transform-origin:left}
.header-bottom-inner{max-width:var(--max-width);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;width:100%;height:100%}
.main-nav{display:none}
.main-nav[data-open]{display:block;position:fixed;top:calc(var(--header-top-h) + var(--header-bottom-h));left:0;right:0;bottom:0;background:rgba(26,26,26,0.96);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);padding:32px 24px;z-index:800;overflow-y:auto}
.main-nav[data-open] .nav-list{flex-direction:column;gap:4px}
.main-nav[data-open] .nav-list a{font-size:1.25rem;padding:14px 20px;border-bottom:1px solid rgba(176,176,176,0.1)}
@media(min-width:900px){.main-nav{display:flex;align-items:center;flex:1}.main-nav[data-open]{position:static;background:transparent;backdrop-filter:none;padding:0;overflow:visible}.main-nav[data-open] .nav-list{flex-direction:row;gap:0}}
.nav-list{display:flex;align-items:center;gap:0}
.nav-list a{display:block;padding:10px 20px;font-family:var(--font-heading);font-weight:600;font-size:0.95rem;color:var(--text-primary);letter-spacing:0.3px;position:relative;transition:color var(--transition),background var(--transition);border-radius:4px}
.nav-list a:hover{color:var(--color-primary);background:rgba(200,16,46,0.08)}
.nav-list a[aria-current="page"]{color:var(--color-primary);background:rgba(200,16,46,0.1)}
.nav-list a[aria-current="page"]::after{content:'';position:absolute;bottom:0;left:20%;right:20%;height:2px;background:var(--color-primary);border-radius:1px}
.btn-primary{display:inline-flex;align-items:center;justify-content:center;padding:10px 28px;font-family:var(--font-heading);font-weight:700;font-size:0.9rem;color:var(--text-primary);background:linear-gradient(135deg,var(--gradient-start),var(--gradient-end));border-radius:var(--radius);border:none;cursor:pointer;transition:transform var(--transition),box-shadow var(--transition);text-decoration:none;white-space:nowrap;letter-spacing:0.5px;box-shadow:0 4px 16px rgba(200,16,46,0.3)}
.btn-primary:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 8px 28px rgba(200,16,46,0.45);color:var(--text-primary)}
.btn-primary:active{transform:translateY(0) scale(0.98)}
.nav-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;background:transparent;border:1px solid rgba(176,176,176,0.3);border-radius:6px;cursor:pointer;gap:5px;padding:8px;transition:border-color var(--transition),background var(--transition)}
.nav-toggle:hover{border-color:var(--color-primary);background:rgba(200,16,46,0.08)}
.nav-toggle-line{display:block;width:20px;height:2px;background:var(--text-primary);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(min-width:900px){.nav-toggle{display:none}}
.site-footer{background:var(--color-secondary);border-top:1px solid rgba(176,176,176,0.15);position:relative}
.site-footer::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--gradient-start),var(--gradient-end));opacity:0.6}
.footer-main{padding:56px 24px 32px}
.footer-inner{max-width:var(--max-width);margin:0 auto}
.footer-brand{margin-bottom:40px}
.footer-logo{font-family:var(--font-heading);font-weight:800;font-size:1.5rem;color:var(--text-primary);letter-spacing:0.5px;transition:color var(--transition)}
.footer-logo:hover{color:var(--color-primary)}
.footer-desc{color:var(--text-secondary);font-size:0.9rem;margin-top:8px;max-width:500px;line-height:1.7}
.footer-links{display:grid;grid-template-columns:1fr;gap:32px}
@media(min-width:640px){.footer-links{grid-template-columns:1fr 1fr}}
@media(min-width:900px){.footer-links{grid-template-columns:1fr 1fr 1fr;gap:48px}}
.footer-heading{font-family:var(--font-heading);font-weight:700;font-size:1rem;color:var(--text-primary);margin-bottom:16px;letter-spacing:0.5px;position:relative;display:inline-block}
.footer-heading::after{content:'';display:block;width:32px;height:2px;background:var(--color-primary);margin-top:6px;border-radius:1px}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-list a{color:var(--text-secondary);font-size:0.9rem;transition:color var(--transition),padding-left var(--transition);padding-left:0}
.footer-list a:hover{color:var(--color-primary);padding-left:6px}
.footer-contact-item{color:var(--text-secondary);font-size:0.9rem;margin-bottom:6px;line-height:1.6}
.footer-bottom{border-top:1px solid rgba(176,176,176,0.12);padding:20px 24px;text-align:center}
.footer-bottom .footer-inner{display:flex;flex-direction:column;align-items:center;gap:8px}
@media(min-width:640px){.footer-bottom .footer-inner{flex-direction:row;justify-content:space-between;flex-wrap:wrap}}
.footer-icp{font-size:0.8rem;color:var(--text-secondary)}
.footer-copyright{font-size:0.8rem;color:var(--text-secondary)}
.footer-trust{font-size:0.75rem;color:var(--text-secondary);opacity:0.7;max-width:600px;margin:4px auto 0;line-height:1.5}
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px;width:100%}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:16px 0;font-size:0.85rem;color:var(--text-secondary)}
.breadcrumb a{color:var(--text-secondary);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--color-primary)}
.breadcrumb .sep{color:var(--text-secondary);opacity:0.4}
.breadcrumb [aria-current="page"]{color:var(--text-primary);font-weight:600}
.section-title{font-family:var(--font-heading);font-weight:800;font-size:1.75rem;color:var(--text-primary);margin-bottom:24px;position:relative;display:inline-block;letter-spacing:-0.3px}
.section-title::after{content:'';display:block;width:48px;height:3px;background:linear-gradient(90deg,var(--gradient-start),var(--gradient-end));margin-top:8px;border-radius:2px;transform:skewX(-8deg)}
@media(min-width:768px){.section-title{font-size:2.25rem}}
.card{background:rgba(255,255,255,0.04);border:1px solid rgba(176,176,176,0.12);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition)}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(0,0,0,0.25);border-color:rgba(200,16,46,0.3)}
.grid{display:grid;gap:24px;grid-template-columns:1fr}
@media(min-width:640px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:900px){.grid{grid-template-columns:repeat(3,1fr)}}
.scroll-progress{position:fixed;top:0;left:0;width:0;height:3px;background:linear-gradient(90deg,var(--gradient-start),var(--gradient-end));z-index:999;border-radius:0 2px 2px 0;transition:width 0.1s linear;pointer-events:none}
@media(prefers-reduced-motion:reduce){.scroll-progress{display:none}}
.back-to-top{position:fixed;bottom:32px;right:32px;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--gradient-start),var(--gradient-end));color:var(--text-primary);border:none;font-size:1.25rem;cursor:pointer;box-shadow:0 4px 20px rgba(200,16,46,0.35);display:flex;align-items:center;justify-content:center;opacity:0;transform:translateY(20px);pointer-events:none;transition:opacity 0.4s,transform 0.4s,box-shadow var(--transition);z-index:800}
.back-to-top.visible{opacity:1;transform:translateY(0);pointer-events:auto}
.back-to-top:hover{box-shadow:0 8px 32px rgba(200,16,46,0.5);transform:translateY(-2px)}
.back-to-top:active{transform:translateY(0) scale(0.95)}
@media(prefers-reduced-motion:reduce){.back-to-top{transition:none}}
@media(max-width:480px){.back-to-top{bottom:20px;right:20px;width:40px;height:40px;font-size:1rem}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition-duration:0.01ms!important;animation-duration:0.01ms!important;scroll-behavior:auto}}