*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: 'Noto Serif SC', 'Times New Roman', serif; font-weight: 400; line-height: 1.6; color: #F5F5F5; background: #0B1A30; min-height: 100vh; }
:focus-visible { outline: 2px solid #FF6B35; outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; } }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { max-width: 100%; display: block; height: auto; }

/* CSS Variables */
:root {
  --primary: #0B1A30;
  --secondary: #FF6B35;
  --white: #FFFFFF;
  --gray-light: #F5F5F5;
  --gray-medium: #CCCCCC;
  --dark-gray: #4A4A4A;
  --gradient-start: #0B1A30;
  --gradient-end: #1A2D4A;
  --heading-font: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --body-font: 'Noto Serif SC', 'Times New Roman', serif;
  --number-font: 'Roboto Mono', 'Consolas', monospace;
  --max-width: 1200px;
  --header-height: 72px;
}

/* Content Container */
.content-container { max-width: var(--max-width); margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .content-container { padding: 0 32px; } }
@media (min-width: 1200px) { .content-container { padding: 0 48px; } }

/* Skip Link */
.skip-link { position: absolute; top: -100%; left: 16px; background: var(--secondary); color: var(--white); padding: 8px 16px; z-index: 1000; border-radius: 4px; font-weight: 600; transition: top 0.2s; }
.skip-link:focus { top: 8px; }

/* Typography */
h1, h2, h3, h4, h5, h6 { font-family: var(--heading-font); font-weight: 700; letter-spacing: -0.5px; }
h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }
body, p, li { font-family: var(--body-font); font-size: 1rem; }
small { font-size: 0.875rem; }
.text-number { font-family: var(--number-font); font-weight: 500; }

/* Header */
.site-header { background: var(--primary); border-bottom: 2px solid var(--secondary); position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-height); gap: 16px; }
.brand { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.brand-link { display: flex; align-items: baseline; gap: 8px; }
.brand-logo { font-family: var(--heading-font); font-weight: 700; font-size: 1.8rem; color: var(--white); letter-spacing: -1px; }
.brand-badge { display: inline-block; background: var(--secondary); color: var(--primary); padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 700; margin-left: 4px; vertical-align: middle; }
.brand-subtext { font-family: var(--body-font); font-size: 0.8rem; color: var(--gray-medium); display: none; }
@media (min-width: 640px) { .brand-subtext { display: inline-block; } }

/* Navigation */
.header-nav { display: none; }
@media (min-width: 768px) { .header-nav { display: flex; } }
.nav-list { display: flex; gap: 24px; }
.nav-list a { font-family: var(--heading-font); font-weight: 600; font-size: 0.95rem; color: var(--gray-light); padding: 6px 0; position: relative; transition: color 0.2s; }
.nav-list a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--secondary); transition: width 0.25s; }
.nav-list a:hover, .nav-list a:focus-visible { color: var(--secondary); }
.nav-list a:hover::after, .nav-list a:focus-visible::after { width: 100%; }
.nav-list [aria-current="page"] { color: var(--secondary); }
.nav-list [aria-current="page"]::after { width: 100%; background: var(--secondary); }

/* Mobile Navigation Toggle */
.header-actions { display: flex; align-items: center; gap: 16px; }
.nav-toggle { display: flex; flex-direction: column; justify-content: center; gap: 5px; width: 32px; height: 32px; background: none; border: none; cursor: pointer; padding: 4px; }
@media (min-width: 768px) { .nav-toggle { display: none; } }
.hamburger-line { display: block; width: 100%; height: 3px; background: var(--white); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
[data-open] .hamburger-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
[data-open] .hamburger-line:nth-child(2) { opacity: 0; }
[data-open] .hamburger-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Nav Overlay */
[data-nav] { position: absolute; top: var(--header-height); left: 0; width: 100%; background: var(--primary); padding: 16px 24px; display: none; flex-direction: column; border-top: 2px solid var(--secondary); box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
[data-nav][data-open] { display: flex; }
[data-nav] .nav-list { flex-direction: column; gap: 12px; }
[data-nav] .nav-list a { font-size: 1.1rem; padding: 8px 0; }
@media (min-width: 768px) { [data-nav] { position: static; background: none; padding: 0; border: none; box-shadow: none; display: flex; } [data-nav] .nav-list { flex-direction: row; gap: 24px; } }

/* CTA Button */
.btn-cta { display: inline-flex; align-items: center; justify-content: center; padding: 10px 24px; background: var(--secondary); color: var(--primary); font-family: var(--heading-font); font-weight: 700; font-size: 0.95rem; border: none; border-radius: 6px; cursor: pointer; transition: background 0.2s, transform 0.15s; text-decoration: none; }
.btn-cta:hover, .btn-cta:focus-visible { background: #e55c2a; transform: scale(1.02); }
.btn-cta:active { transform: scale(0.98); }

/* Footer */
.site-footer { background: var(--primary); border-top: 2px solid var(--secondary); padding: 40px 0 24px; }
.footer-main { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 640px) { .footer-main { grid-template-columns: 2fr 1fr; gap: 32px; } }
@media (min-width: 1024px) { .footer-main { grid-template-columns: 2fr 1fr 1fr; } }
.footer-brand .brand { margin-bottom: 12px; }
.footer-tagline { color: var(--gray-medium); font-size: 0.9rem; margin-top: 4px; }
.footer-contact { margin-top: 16px; display: flex; flex-direction: column; gap: 6px; font-size: 0.875rem; color: var(--gray-light); }
.footer-contact address { font-style: normal; color: var(--gray-medium); }
.footer-phone::before { content: '📞 '; }
.footer-email::before { content: '✉️ '; }
.footer-links ul { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a { color: var(--gray-light); font-size: 0.9rem; transition: color 0.2s; }
.footer-links a:hover, .footer-links a:focus-visible { color: var(--secondary); }
.footer-legal { grid-column: 1 / -1; border-top: 1px solid var(--dark-gray); padding-top: 20px; margin-top: 16px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 0.8rem; color: var(--gray-medium); }
.footer-copyright { white-space: nowrap; }
.footer-icp { color: var(--gray-medium); }

/* Scroll Progress Indicator */
[data-scroll-progress] { position: fixed; top: 0; left: 0; height: 3px; background: var(--secondary); z-index: 200; width: 0%; transition: width 0.1s linear; }
@media (prefers-reduced-motion: reduce) { [data-scroll-progress] { display: none; } }

/* Generic Utility Classes */
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-white { color: var(--white); }
.text-gray { color: var(--gray-medium); }
.bg-primary { background: var(--primary); }
.bg-secondary { background: var(--secondary); }
.bg-white { background: var(--white); }
.bg-gray-light { background: var(--gray-light); }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.p-4 { padding: 16px; }
.text-center { text-align: center; }

/* Grid Systems */
.grid-2, .grid-3, .grid-auto { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

/* Card Component */
.card { background: var(--white); color: var(--primary); border-radius: 8px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.2s, box-shadow 0.2s; clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%); }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

/* Breadcrumb (generic) */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 0; font-size: 0.875rem; color: var(--gray-medium); }
.breadcrumb a { color: var(--secondary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span::before { content: '/'; margin-right: 8px; color: var(--gray-medium); }
.breadcrumb span:first-child::before { content: none; }

/* Chamfer panel decorative */
.chamfer-panel { position: relative; background: var(--gradient-end); clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px)); padding: 24px; }

/* Score bar */
.score-bar { display: flex; align-items: center; gap: 8px; font-family: var(--number-font); font-size: 2rem; font-weight: 700; }
.score-bar .bar { flex: 1; height: 8px; background: var(--gray-medium); border-radius: 4px; overflow: hidden; }
.score-bar .bar-fill { height: 100%; background: var(--secondary); border-radius: 4px; transition: width 0.3s; }

/* Main content skip target */
#main-content { outline: none; }