/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:#FFFFFF;color:#1A1A1A;line-height:1.5;min-height:100vh;display:flex;flex-direction:column}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
input,button{font:inherit;border:none;outline:none;background:none;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid #D4AF37;outline-offset:2px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition-duration:0ms!important;animation-duration:0ms!important;scroll-behavior:auto!important}}

/* ===== CSS VARIABLES ===== */
:root{
  --color-red:#C8102E;
  --color-black:#1A1A1A;
  --color-gold:#D4AF37;
  --color-darkgray:#2E2E2E;
  --color-white:#FFFFFF;
  --color-lightgray:#F5F5F5;
  --color-brightred:#E63946;
  --color-darkgold:#B8960C;
  --font-primary:'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'SF Mono','Courier New',Consolas,monospace;
  --nav-width:220px;
  --header-height:64px;
  --z-header:100;
  --z-nav:200;
  --z-progress:300;
  --transition-fast:200ms ease;
  --shadow-card:0 2px 12px rgba(26,26,26,0.08);
  --border-print:2px solid var(--color-black);
}

/* ===== SKIP LINK ===== */
.skip-link{position:fixed;top:0;left:0;z-index:999;padding:8px 16px;background:#1A1A1A;color:#FFFFFF;font-size:14px;transform:translateY(-120%);transition:transform var(--transition-fast)}.skip-link:focus{transform:translateY(0)}

/* ===== SCROLL PROGRESS ===== */
.scroll-progress{position:fixed;top:0;left:0;width:0;height:3px;background:#C8102E;z-index:var(--z-progress);transition:width 150ms ease;pointer-events:none}@media(prefers-reduced-motion:reduce){.scroll-progress{transition:none}}

/* ===== HEADER ===== */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:#1A1A1A;z-index:var(--z-header);border-bottom:2px solid #C8102E}
.site-header-inner{display:flex;align-items:center;height:100%;padding:0 20px;max-width:1440px;margin:0 auto;gap:16px}
.brand-area{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{display:flex;align-items:center;gap:8px;color:#FFFFFF;font-weight:bold;font-size:18px}
.brand-logo svg{flex-shrink:0}
.brand-text{letter-spacing:1px}
.brand-note{font-size:11px;color:#D4AF37;writing-mode:vertical-rl;text-orientation:mixed;transform:rotate(180deg);opacity:0.8;letter-spacing:2px;line-height:1.2;margin-left:2px}
.side-nav{display:none;position:fixed;top:var(--header-height);left:0;bottom:0;width:var(--nav-width);background:#1A1A1A;border-right:1px solid #2E2E2E;padding:32px 16px;overflow-y:auto;z-index:var(--z-nav)}
.side-nav[data-open]{display:block}
.nav-list{display:flex;flex-direction:column;gap:4px}
.nav-list li a{display:block;padding:10px 16px;color:#CCCCCC;font-size:15px;font-weight:500;border-left:3px solid transparent;transition:all var(--transition-fast);position:relative}
.nav-list li a:hover,.nav-list li a:focus-visible{color:#FFFFFF;background:#2E2E2E;border-left-color:#C8102E}
.nav-list li a[aria-current="page"]{color:#FFFFFF;background:#2E2E2E;border-left-color:#C8102E;font-weight:700}
.nav-list li a[aria-current="page"]::after{content:'';position:absolute;bottom:4px;left:16px;right:16px;height:2px;background:#D4AF37;transform:scaleX(0.3);transform-origin:left;transition:transform var(--transition-fast)}
.nav-list li a[aria-current="page"]:hover::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.search-box{position:relative;width:200px}
.search-input{width:100%;padding:8px 14px;background:#2E2E2E;color:#FFFFFF;border:1px solid #4A4A4A;border-radius:4px;font-size:14px;transition:border-color var(--transition-fast)}
.search-input::placeholder{color:#888888}
.search-input:focus{border-color:#D4AF37}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 20px;font-size:14px;font-weight:600;border-radius:4px;transition:all var(--transition-fast);white-space:nowrap}
.btn-primary{background:#C8102E;color:#FFFFFF}.btn-primary:hover,.btn-primary:focus-visible{background:#E63946}
.nav-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;gap:5px;background:#2E2E2E;border-radius:4px;padding:8px;margin-left:auto;flex-shrink:0}
.nav-toggle span{display:block;width:22px;height:2px;background:#FFFFFF;border-radius:1px;transition:all var(--transition-fast)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(min-width:1024px){
  .site-header{height:100vh;width:var(--nav-width);border-bottom:none;border-right:2px solid #C8102E}
  .site-header-inner{flex-direction:column;align-items:stretch;padding:24px 16px;height:100%;max-width:none;gap:24px}
  .brand-area{flex-direction:column;align-items:flex-start;gap:4px;padding-bottom:16px;border-bottom:1px solid #2E2E2E}
  .brand-note{writing-mode:vertical-rl;transform:rotate(180deg);margin-left:0;margin-top:4px;font-size:10px}
  .side-nav{position:static;display:block!important;width:auto;border-right:none;padding:0;background:transparent;overflow:visible}
  .nav-list{gap:2px}
  .nav-list li a{padding:10px 12px;font-size:14px}
  .header-actions{flex-direction:column;gap:8px;margin-left:0;margin-top:auto;padding-top:16px;border-top:1px solid #2E2E2E}
  .search-box{width:100%}
  .btn{width:100%;text-align:center}
  .nav-toggle{display:none}
}

/* ===== MAIN CONTENT ===== */
#main-content{flex:1;margin-top:var(--header-height)}@media(min-width:1024px){#main-content{margin-top:0;margin-left:var(--nav-width)}}
.page-content{max-width:1120px;margin:0 auto;padding:32px 20px 64px}
.page-content .container{width:100%}
.section-number{font-family:var(--font-mono);font-size:48px;font-weight:700;color:#D4AF37;line-height:1;letter-spacing:-1px;display:block;margin-bottom:8px}
.section-title{font-size:42px;font-weight:700;font-style:italic;line-height:1.1;color:#1A1A1A;margin-bottom:16px}
.section-title .highlight{color:#C8102E}
.section-subtitle{font-size:18px;color:#2E2E2E;font-weight:400;max-width:640px;margin-bottom:32px}
.gold-line{width:60px;height:2px;background:#D4AF37;margin:16px 0 24px}
.tag-label{display:inline-block;font-size:11px;font-weight:600;color:#D4AF37;text-transform:uppercase;letter-spacing:2px;writing-mode:vertical-rl;transform:rotate(180deg);position:absolute;right:-24px;top:8px;white-space:nowrap}
.card{background:#FFFFFF;border:2px solid #1A1A1A;box-shadow:var(--shadow-card);padding:24px;position:relative;transition:all var(--transition-fast)}
.card::before{content:'';position:absolute;top:4px;left:4px;right:-4px;bottom:-4px;border:1px solid #B8960C;pointer-events:none;z-index:-1}
.card:hover{border-color:#C8102E;box-shadow:0 4px 20px rgba(200,16,46,0.12)}
.card .data-highlight{font-family:var(--font-mono);font-size:32px;font-weight:700;color:#D4AF37;line-height:1.1;display:block}
.card .card-title{font-size:20px;font-weight:700;margin:12px 0 8px}
.card .card-desc{font-size:14px;color:#2E2E2E;line-height:1.6}
@media(max-width:767px){
  .section-number{font-size:36px}
  .section-title{font-size:28px}
  .card{padding:16px}
  .card .data-highlight{font-size:24px}
}

/* ===== FOOTER ===== */
.site-footer{background:#1A1A1A;color:#CCCCCC;border-top:3px solid #C8102E;margin-top:auto}
@media(min-width:1024px){.site-footer{margin-left:var(--nav-width)}}
.footer-inner{max-width:1120px;margin:0 auto;padding:48px 20px 24px;display:grid;grid-template-columns:1fr;gap:32px}
@media(min-width:640px){.footer-inner{grid-template-columns:1fr 1fr}}
@media(min-width:1024px){.footer-inner{grid-template-columns:2fr 1fr 1fr 1fr}}
.footer-brand .brand-logo{color:#FFFFFF;margin-bottom:12px}
.footer-brand .brand-logo .brand-text{font-size:20px}
.footer-tagline{font-size:13px;color:#999999;margin-top:8px;max-width:280px;line-height:1.6}
.footer-heading{font-size:13px;font-weight:700;color:#D4AF37;text-transform:uppercase;letter-spacing:1px;margin-bottom:12px}
.footer-links ul{display:flex;flex-direction:column;gap:8px}
.footer-links ul li a{font-size:14px;color:#CCCCCC;transition:color var(--transition-fast);position:relative;display:inline-block}
.footer-links ul li a::after{content:'';position:absolute;left:0;bottom:-2px;width:0;height:1px;background:#D4AF37;transition:width var(--transition-fast)}
.footer-links ul li a:hover,.footer-links ul li a:focus-visible{color:#FFFFFF}
.footer-links ul li a:hover::after{width:100%}
.footer-contact p{font-size:14px;margin-bottom:6px;color:#CCCCCC}
.footer-contact a{color:#D4AF37;transition:color var(--transition-fast)}
.footer-contact a:hover{color:#C8102E}
.footer-icp p{font-size:12px;color:#888888;margin-bottom:4px}
.footer-address{font-size:12px;color:#666666}
.footer-bottom{border-top:1px solid #2E2E2E;padding:16px 20px;text-align:center;font-size:12px;color:#888888;max-width:1120px;margin:0 auto}

/* ===== UTILITY ===== */
.container{max-width:1120px;margin:0 auto;padding:0 20px}
.grid-2{display:grid;grid-template-columns:1fr;gap:24px}@media(min-width:640px){.grid-2{grid-template-columns:1fr 1fr}}
.grid-3{display:grid;grid-template-columns:1fr;gap:24px}@media(min-width:640px){.grid-3{grid-template-columns:1fr 1fr}}@media(min-width:1024px){.grid-3{grid-template-columns:1fr 1fr 1fr}}
.flex-center{display:flex;align-items:center;justify-content:center}
.text-gold{color:#D4AF37}
.text-red{color:#C8102E}
.font-mono{font-family:var(--font-mono)}
.mt-16{margin-top:16px}
.mt-32{margin-top:32px}
.mb-16{margin-bottom:16px}
.mb-32{margin-bottom:32px}
.p-16{padding:16px}
.p-24{padding:24px}
@media(max-width:767px){
  .p-24{padding:16px}
  .mt-32{margin-top:20px}
  .mb-32{margin-bottom:20px}
}