/* Reset */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:'Inter','-apple-system','BlinkMacSystemFont','Segoe UI',sans-serif;background:#F5F7FA;color:#0A2647;line-height:1.6;min-height:100vh}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
input,button{font:inherit;border:none;outline:none;background:transparent}

/* CSS Variables */
:root{
  --color-primary:#0A2647;
  --color-primary-light:#1E3A5F;
  --color-primary-dark:#061A2E;
  --color-accent:#FF6B35;
  --color-accent-light:#FF8C5A;
  --color-accent-dark:#CC552A;
  --color-bg:#F5F7FA;
  --color-card:#FFFFFF;
  --color-text:#0A2647;
  --color-text-secondary:#4A5568;
  --color-text-on-primary:#FFFFFF;
  --color-text-on-accent:#FFFFFF;
  --color-border:#E2E8F0;
  --font-heading:800 36px/1.1 'Inter',sans-serif;
  --font-subheading:800 28px/1.2 'Inter',sans-serif;
  --font-body:400 16px/1.6 'Inter',sans-serif;
  --font-mono:500 14px/1.5 'JetBrains Mono',monospace;
  --container-max:1280px;
  --header-height:120px;
  --header-brand-height:60px;
}

/* Container */
.container{width:100%;max-width:var(--container-max);margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
@media(min-width:1024px){.container{padding:0 48px}}

/* Skip link */
.skip-link{position:absolute;top:-100%;left:8px;z-index:9999;padding:8px 16px;background:var(--color-accent);color:#fff;font-weight:600;border-radius:0 0 4px 4px;transition:top .2s}
.skip-link:focus{top:0;outline:2px solid var(--color-accent-light);outline-offset:2px}

/* Site Header */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:100;background:var(--color-primary);color:var(--color-text-on-primary);box-shadow:0 2px 8px rgba(0,0,0,.15)}
.brand-bar{height:var(--header-brand-height);border-bottom:1px solid var(--color-primary-light)}
.brand-bar .container{display:flex;align-items:center;height:100%;gap:16px}
.brand{display:flex;flex-direction:column;align-items:flex-start;line-height:1.2}
.brand-logo-text{font-size:22px;font-weight:800;letter-spacing:1px;text-transform:uppercase}
.brand-sub{font-size:12px;font-weight:400;color:var(--color-accent-light);margin-top:-2px}
.search-area{flex:1;max-width:360px;margin-left:auto}
.search-input{width:100%;padding:8px 14px;border-radius:4px;background:var(--color-primary-light);color:var(--color-text-on-primary);font-size:14px;border:1px solid var(--color-primary-light);transition:border .2s}
.search-input::placeholder{color:rgba(255,255,255,.5)}
.search-input:focus{border-color:var(--color-accent);outline:none}
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;gap:5px;cursor:pointer;background:none;border:none;color:var(--color-text-on-primary)}
.nav-toggle-bar{display:block;width:24px;height:2px;background:var(--color-text-on-primary);border-radius:1px;transition:transform .3s,opacity .3s}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-bar{background:var(--color-primary-dark)}
.nav-list{display:flex;align-items:center;height:50px;gap:0}
.nav-item{height:100%}
.nav-link{display:flex;align-items:center;height:100%;padding:0 20px;font-size:14px;font-weight:500;letter-spacing:0.3px;transition:background .2s,color .2s;border-bottom:3px solid transparent;white-space:nowrap}
.nav-link:hover,.nav-link:focus-visible{background:rgba(255,255,255,.08);outline:none}
.nav-link[aria-current="page"]{border-bottom-color:var(--color-accent);color:var(--color-accent-light);background:rgba(255,107,53,.1)}
@media(max-width:767px){
  .nav-toggle{display:flex}
  .search-area{display:none}
  .nav-bar{position:absolute;top:var(--header-brand-height);left:0;width:100%;background:var(--color-primary-dark);max-height:0;overflow:hidden;transition:max-height .3s ease}
  .nav-bar[data-open]{max-height:400px}
  .nav-list{flex-direction:column;height:auto;padding:8px 0}
  .nav-item{width:100%;height:auto}
  .nav-link{padding:14px 20px;border-bottom:none;border-left:3px solid transparent;justify-content:flex-start}
  .nav-link[aria-current="page"]{border-left-color:var(--color-accent);border-bottom:none}
}
@media(min-width:768px){
  .nav-list{justify-content:center}
}

/* Site Footer */
.site-footer{background:var(--color-primary-dark);color:var(--color-text-on-primary);padding:48px 0 24px;margin-top:80px}
.footer-top{display:grid;grid-template-columns:1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid var(--color-primary-light);margin-bottom:24px}
@media(min-width:768px){.footer-top{grid-template-columns:1fr 1fr 1.5fr}}
.footer-brand .brand{font-size:24px;font-weight:800;letter-spacing:1px;color:var(--color-text-on-primary)}
.footer-desc{font-size:14px;color:rgba(255,255,255,.7);margin-top:8px}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-link{font-size:14px;color:var(--color-accent-light);transition:opacity .2s}
.footer-link:hover,.footer-link:focus-visible{opacity:.8;outline:none}
.footer-contact{display:flex;flex-direction:column;gap:8px;font-size:13px;color:rgba(255,255,255,.6)}
.contact-item{line-height:1.5}
.footer-bottom{text-align:center}
.footer-copyright{font-size:13px;color:rgba(255,255,255,.5);margin-bottom:6px}
.footer-trust{font-size:12px;color:rgba(255,255,255,.4)}

/* Universal Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;font-size:15px;font-weight:600;border-radius:2px;cursor:pointer;transition:background .2s,transform .2s,box-shadow .2s;border:2px solid transparent;line-height:1.2;text-align:center}
.btn-primary{background:var(--color-accent);color:var(--color-text-on-accent);border-color:var(--color-accent)}
.btn-primary:hover,.btn-primary:focus-visible{background:var(--color-accent-dark);transform:translateY(-1px);box-shadow:0 4px 12px rgba(255,107,53,.3)}
.btn-outline{background:transparent;color:var(--color-primary);border-color:var(--color-primary)}
.btn-outline:hover,.btn-outline:focus-visible{background:var(--color-primary);color:var(--color-text-on-primary)}
.btn-small{padding:8px 18px;font-size:13px}

/* Card */
.card{background:var(--color-card);border:1px solid var(--color-border);border-radius:2px;box-shadow:0 2px 8px rgba(0,0,0,.04);transition:box-shadow .2s,transform .2s}
.card:hover{box-shadow:0 6px 20px rgba(0,0,0,.08);transform:translateY(-2px)}

/* Tag */
.tag{display:inline-flex;align-items:center;padding:2px 10px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:0.5px;border-radius:2px;background:var(--color-primary-light);color:var(--color-text-on-primary)}
.tag-accent{background:var(--color-accent);color:var(--color-text-on-accent)}

/* Data Table base */
.data-table{width:100%;border-collapse:collapse;font-size:14px}
.data-table th,.data-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--color-border)}
.data-table th{background:var(--color-primary);color:var(--color-text-on-primary);font-weight:600;font-size:13px;letter-spacing:0.5px}
.data-table tr[data-expandable]{cursor:pointer}
.data-table tr[data-expandable] .expand-icon::after{content:'+';margin-left:8px;font-weight:700;color:var(--color-accent)}
.data-table tr[data-expanded] .expand-icon::after{content:'–'}
.data-table tr[data-expanded]+.detail-row{display:table-row}

/* Sections & animate */
.section{padding:64px 0}
@media(max-width:767px){.section{padding:40px 0}}
.fade-in-up{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.fade-in-up.is-visible{opacity:1;transform:translateY(0)}
@media(prefers-reduced-motion:reduce){
  .fade-in-up{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* Scroll progress bar */
.scroll-progress-bar{position:fixed;top:0;left:0;height:3px;background:var(--color-accent);z-index:200;width:0;transition:width .1s linear}

/* Back to top */
.back-to-top{position:fixed;bottom:32px;right:32px;width:48px;height:48px;border-radius:2px;background:var(--color-primary);color:var(--color-text-on-primary);display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s,transform .2s;border:none;box-shadow:0 2px 8px rgba(0,0,0,.2);z-index:90}
.back-to-top.is-visible{opacity:1;visibility:visible}
.back-to-top:hover,.back-to-top:focus-visible{transform:translateY(-4px);outline:2px solid var(--color-accent);outline-offset:2px}
.back-to-top::after{content:'↑';font-weight:700}

/* Focus visible global */
:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}

/* Generic image container placeholder */
.img-box{position:relative;overflow:hidden;background:var(--color-border);min-height:120px;display:flex;align-items:center;justify-content:center;color:var(--color-text-secondary);font-size:13px}
.img-box.ratio-16-9{padding-bottom:56.25%}
.img-box.ratio-4-3{padding-bottom:75%}
.img-box img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}

/* Grid utilities */
.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}}