/* === RESET === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;border:0;font:inherit;vertical-align:baseline}
html{scroll-behavior:smooth;text-size-adjust:100%;-webkit-text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;font-family:'Inter',sans-serif;background:#F8F9FA;color:#2C3E50;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,svg,video,canvas{display:block;max-width:100%;height:auto}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{cursor:pointer;background:none;border:none;font:inherit;color:inherit}
:focus-visible{outline:3px solid #E63946;outline-offset:2px;border-radius:4px}
@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}}

/* === CSS VARIABLES === */
:root{
  --color-red:#E63946;
  --color-blue:#1D3557;
  --color-gold:#F4A261;
  --color-silver:#E5E5E5;
  --color-dark:#0B1D3A;
  --color-light:#F8F9FA;
  --color-text:#2C3E50;
  --color-green:#2ECC71;
  --font-heading:'Montserrat Black','Arial Black',sans-serif;
  --font-body:'Inter','Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono','Consolas',monospace;
  --container-max:1280px;
  --container-pad:24px;
  --header-upper-h:56px;
  --header-lower-h:60px;
  --z-header:200;
  --z-progress:210;
  --z-nav:190;
  --shadow-card:0 4px 20px rgba(0,0,0,0.08),0 1px 4px rgba(0,0,0,0.04);
  --shadow-float:0 12px 40px rgba(0,0,0,0.12);
  --radius-sm:4px;
  --radius-md:8px;
  --radius-lg:12px;
  --transition:0.25s cubic-bezier(0.4,0,0.2,1)
}

/* === UTILITY === */
.page-container{width:100%;max-width:var(--container-max);margin:0 auto;padding-left:var(--container-pad);padding-right:var(--container-pad)}
.skip-link{position:absolute;top:-100%;left:16px;z-index:300;padding:12px 24px;background:var(--color-red);color:#fff;font-weight:700;border-radius:0 0 6px 6px;transition:top 0.3s}
.skip-link:focus{top:0}

/* === SCROLL PROGRESS === */
.scroll-progress{position:fixed;top:0;left:0;width:0;height:4px;z-index:var(--z-progress);background:linear-gradient(90deg,var(--color-red),var(--color-gold));border-radius:0 2px 2px 0;pointer-events:none;transition:width 0.1s linear}
@media(prefers-reduced-motion:reduce){.scroll-progress{display:none}}

/* === HEADER UPPER === */
.site-header{position:sticky;top:0;z-index:var(--z-header);font-family:var(--font-body)}
.header-upper{background:var(--color-dark);height:var(--header-upper-h);display:flex;align-items:center;position:relative;overflow:hidden}
.header-upper__inner{display:flex;align-items:center;gap:20px;height:100%;position:relative}
.header-brand{font-family:var(--font-heading);font-size:1.25rem;color:#fff;letter-spacing:1px;white-space:nowrap}
.header-brand::after{content:'';display:inline-block;width:4px;height:4px;background:var(--color-red);border-radius:50%;margin-left:6px;vertical-align:middle;animation:pulse-dot 2s ease-in-out infinite}
.header-tagline{font-size:0.85rem;color:var(--color-silver);opacity:0.85;white-space:nowrap;font-weight:400;letter-spacing:0.3px}
.data-flow{display:flex;align-items:center;gap:8px;margin-left:auto;flex-shrink:0}
.data-dot{width:6px;height:6px;border-radius:50%;background:var(--color-red);animation:pulse-dot 1.8s ease-in-out infinite;opacity:0.7}
.data-dot:nth-child(odd){background:var(--color-gold)}
@keyframes pulse-dot{0%,100%{opacity:0.3;transform:scale(0.8)}50%{opacity:1;transform:scale(1.2)}}
.speed-line{position:absolute;bottom:-2px;left:0;width:100%;height:3px;background:linear-gradient(90deg,transparent 5%,var(--color-red) 20%,var(--color-gold) 50%,var(--color-red) 80%,transparent 95%);opacity:0.9;pointer-events:none}
.speed-line::after{content:'';position:absolute;top:0;left:-20%;width:140%;height:100%;background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,0.3) 50%,transparent 100%);animation:shine 3s ease-in-out infinite}
@keyframes shine{0%{transform:translateX(-30%)}100%{transform:translateX(30%)}}

/* === HEADER LOWER === */
.header-lower{background:var(--color-blue);min-height:var(--header-lower-h);display:flex;align-items:center;position:relative;box-shadow:0 2px 12px rgba(0,0,0,0.15)}
.header-lower__inner{display:flex;align-items:center;width:100%;position:relative}
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;gap:5px;background:rgba(255,255,255,0.08);border-radius:var(--radius-sm);transition:background var(--transition);flex-shrink:0}
.nav-toggle:hover,.nav-toggle:focus-visible{background:rgba(255,255,255,0.18)}
.nav-toggle__bar{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.main-nav{width:100%}
.nav-list{display:flex;align-items:center;gap:0;height:100%}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;gap:6px;padding:14px 18px;font-family:var(--font-mono);font-size:0.85rem;font-weight:500;color:rgba(255,255,255,0.8);letter-spacing:0.5px;transition:color var(--transition),background var(--transition);white-space:nowrap;position:relative}
.nav-link::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:3px;background:var(--color-red);border-radius:2px 2px 0 0;transition:width var(--transition)}
.nav-link:hover{color:#fff;background:rgba(255,255,255,0.06)}
.nav-link:hover::after{width:60%}
.nav-link[aria-current="page"]{color:var(--color-red);background:rgba(230,57,70,0.12)}
.nav-link[aria-current="page"]::after{width:70%;background:var(--color-red)}
.nav-link__num{font-family:var(--font-mono);font-size:0.7rem;color:var(--color-gold);opacity:0.7;font-weight:500;min-width:22px;letter-spacing:0}
.nav-link[aria-current="page"] .nav-link__num{opacity:1;color:var(--color-gold)}

/* === FOOTER === */
.site-footer{background:var(--color-dark);color:var(--color-silver);padding:48px 0 32px;position:relative;overflow:hidden;border-top:4px solid var(--color-red)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px 48px;position:relative;z-index:1}
.footer-column--brand{display:flex;flex-direction:column;gap:16px}
.footer-brand{font-family:var(--font-heading);font-size:1.4rem;color:#fff;letter-spacing:1px}
.footer-brand::after{content:'·赛场';color:var(--color-red);font-family:var(--font-heading)}
.footer-desc{font-size:0.88rem;line-height:1.7;color:rgba(255,255,255,0.6);max-width:360px}
.footer-heading{font-family:var(--font-heading);font-size:0.9rem;color:var(--color-gold);letter-spacing:0.5px;margin-bottom:16px;text-transform:uppercase}
.footer-contact-list,.footer-legal-list{display:flex;flex-direction:column;gap:12px}
.footer-contact-item{font-size:0.85rem;line-height:1.6;color:rgba(255,255,255,0.7)}
.footer-contact-link{color:var(--color-gold);transition:color var(--transition);border-bottom:1px solid transparent}
.footer-contact-link:hover,.footer-contact-link:focus-visible{color:#fff;border-bottom-color:var(--color-gold)}
.footer-legal-item{margin-bottom:0}
.footer-link{font-size:0.85rem;color:var(--color-silver);transition:color var(--transition),padding-left var(--transition);display:inline-block;position:relative;padding-left:14px}
.footer-link::before{content:'›';position:absolute;left:0;color:var(--color-red);font-weight:700;transition:transform var(--transition)}
.footer-link:hover{color:var(--color-red);padding-left:18px}
.footer-link:hover::before{transform:translateX(2px)}
.footer-icp{font-size:0.78rem;color:rgba(255,255,255,0.35);margin-top:24px;font-family:var(--font-mono);letter-spacing:0.3px}
.speed-line--footer{position:absolute;top:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,transparent 10%,var(--color-red) 30%,var(--color-gold) 60%,var(--color-red) 90%,transparent 100%);opacity:0.6}

/* === COMMON COMPONENTS === */
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;background:var(--color-red);color:#fff;font-family:var(--font-body);font-size:0.95rem;font-weight:600;border-radius:var(--radius-sm);transition:background var(--transition),transform var(--transition),box-shadow var(--transition);box-shadow:0 4px 14px rgba(230,57,70,0.3)}
.btn-primary:hover,.btn-primary:focus-visible{background:#c62e3a;transform:translateY(-1px);box-shadow:0 6px 20px rgba(230,57,70,0.4)}
.btn-secondary{display:inline-flex;align-items:center;gap:8px;padding:10px 28px;background:var(--color-blue);color:#fff;font-family:var(--font-body);font-size:0.9rem;font-weight:500;border-radius:var(--radius-sm);border:1px solid rgba(255,255,255,0.1);transition:background var(--transition),transform var(--transition),border-color var(--transition)}
.btn-secondary:hover,.btn-secondary:focus-visible{background:#152a44;border-color:var(--color-gold);transform:translateY(-1px)}
.tag{display:inline-flex;align-items:center;padding:4px 14px;background:rgba(244,162,97,0.15);color:var(--color-gold);font-family:var(--font-mono);font-size:0.75rem;font-weight:500;border-radius:20px;border:1px solid rgba(244,162,97,0.25);letter-spacing:0.3px}
.card{background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-card);border:1px solid var(--color-silver);overflow:hidden;transition:transform var(--transition),box-shadow var(--transition)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-float)}
.card__header{padding:16px 20px;background:var(--color-blue);color:#fff;font-family:var(--font-heading);font-size:0.95rem;letter-spacing:0.3px}
.card__body{padding:20px;background:var(--color-light);font-size:0.88rem;line-height:1.7;color:var(--color-text)}
.section-title{font-family:var(--font-heading);font-size:2rem;color:var(--color-dark);margin-bottom:24px;position:relative;padding-left:48px;line-height:1.2}
.section-title::before{content:attr(data-num);position:absolute;left:0;top:0;font-family:var(--font-mono);font-size:1.2rem;color:var(--color-red);font-weight:700;opacity:0.7;line-height:1.4}
.section-title::after{content:'';display:block;width:60px;height:3px;background:var(--color-red);margin-top:8px;border-radius:2px}
.page-section{padding:72px 0;position:relative}
.page-section:nth-child(even){background:rgba(29,53,87,0.03)}

/* === RESPONSIVE === */
@media(max-width:1023px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-column--brand{grid-column:1/-1}
  .footer-desc{max-width:100%}
  .nav-link{padding:12px 14px;font-size:0.8rem}
}
@media(max-width:767px){
  :root{--container-pad:16px;--header-upper-h:48px;--header-lower-h:52px}
  .header-upper__inner{gap:12px}
  .header-brand{font-size:1.05rem}
  .header-tagline{font-size:0.75rem;overflow:hidden;text-overflow:ellipsis;max-width:120px}
  .data-flow{display:none}
  .speed-line{height:2px}
  .nav-toggle{display:flex}
  .main-nav{position:absolute;top:100%;left:0;width:100%;background:var(--color-blue);box-shadow:0 8px 24px rgba(0,0,0,0.25);max-height:0;overflow:hidden;transition:max-height 0.4s cubic-bezier(0.4,0,0.2,1),opacity 0.3s;opacity:0;border-top:2px solid var(--color-red)}
  .main-nav[data-open]{max-height:520px;opacity:1}
  .nav-list{flex-direction:column;width:100%;padding:8px 0}
  .nav-item{width:100%}
  .nav-link{width:100%;padding:14px 20px;justify-content:flex-start;font-size:0.9rem;border-bottom:1px solid rgba(255,255,255,0.06)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{background:rgba(230,57,70,0.15);border-left:4px solid var(--color-red)}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-column--brand{grid-column:1}
  .footer-brand{font-size:1.2rem}
  .footer-heading{font-size:0.85rem;margin-bottom:12px}
  .section-title{font-size:1.5rem;padding-left:36px}
  .section-title::before{font-size:1rem}
  .page-section{padding:48px 0}
  .header-lower{min-height:var(--header-lower-h)}
}
@media(min-width:768px)and(max-width:1023px){
  .data-flow{gap:6px}
  .data-dot{width:5px;height:5px}
  .nav-link{padding:12px 12px;font-size:0.78rem;gap:4px}
  .nav-link__num{min-width:18px;font-size:0.65rem}
}

/* === PRINT === */
@media print{
  .site-header,.site-footer,.scroll-progress,.data-flow,.speed-line,.nav-toggle{display:none!important}
  body{background:#fff;color:#000}
  .page-section{padding:24px 0;page-break-inside:avoid}
}