/* Reset & Variables */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --color-red: #E63946;
  --color-red-dark: #c02d39;
  --color-blue: #1D3557;
  --color-blue-light: #2a4a7f;
  --color-gold: #F4A261;
  --color-dark: #2B2D42;
  --color-light-gray: #F8F9FA;
  --color-white: #FFFFFF;
  --color-green: #2A9D8F;
  --color-yellow: #E9C46A;
  --font-heading: "Oswald", "Bebas Neue", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-data: "Fira Code", "Consolas", monospace;
  --container-max: 1200px;
  --radius-btn: 50px;
  --radius-card: 16px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
  --transition: 0.3s ease;
}
html {
  font-size: 16px;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-light-gray);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a {
  color: var(--color-red);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover, a:focus-visible {
  color: var(--color-blue);
}
:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 2px;
  border-radius: 4px;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
ul {
  list-style: none;
}
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
/* Skip Link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  background: var(--color-red);
  color: var(--color-white);
  padding: 12px 24px;
  border-radius: 0 0 var(--radius-btn) 0;
  font-weight: 700;
  transition: left 0.2s;
}
.skip-link:focus {
  left: 0;
}
/* Header */
.site-header {
  background: var(--color-blue);
  padding: 12px 0;
  border-bottom: 3px solid var(--color-red);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.header-logo {
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: none;
}
.logo-red {
  color: var(--color-red);
}
.logo-blue {
  color: var(--color-white);
}
.logo-text {
  color: var(--color-gold);
  font-size: 1rem;
  margin-left: 4px;
  font-family: var(--font-body);
}
.header-logo:hover .logo-red,
.header-logo:focus-visible .logo-red {
  color: var(--color-gold);
}
/* Navigation */
.header-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}
.nav-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-link {
  display: block;
  padding: 8px 16px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-white);
  background: transparent;
  border-radius: var(--radius-btn);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-link:hover,
.nav-link:focus-visible {
  background: var(--color-red);
  color: var(--color-white);
}
.nav-link[aria-current="page"] {
  background: var(--color-red);
  color: var(--color-white);
}
/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--color-white);
  border-radius: 8px;
  padding: 6px 4px;
  cursor: pointer;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
}
.mobile-nav-toggle .bar {
  display: block;
  width: 26px;
  height: 3px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.mobile-nav-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.mobile-nav-toggle[aria-expanded="true"] .bar:nth-child(2) {
  opacity: 0;
}
.mobile-nav-toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}
/* Footer */
.site-footer {
  background: var(--color-blue);
  color: var(--color-white);
  padding: 40px 0 20px;
  margin-top: 80px;
  font-size: 0.9rem;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.footer-brand {
  text-align: center;
}
.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-red);
  letter-spacing: 2px;
}
.footer-logo:hover {
  color: var(--color-gold);
}
.footer-tagline {
  color: rgba(255,255,255,0.7);
  margin-top: 4px;
}
.footer-nav {
  display: flex;
  justify-content: center;
}
.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  color: var(--color-white);
  font-weight: 500;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition);
}
.footer-links a:hover,
.footer-links a:focus-visible {
  border-bottom-color: var(--color-red);
  color: var(--color-white);
}
.contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  text-align: center;
  color: rgba(255,255,255,0.8);
}
.contact-info a {
  color: var(--color-gold);
  font-weight: 600;
}
.contact-info a:hover {
  color: var(--color-red);
}
.footer-bottom {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.6);
  font-size: 0.8rem;
}
.icp {
  letter-spacing: 1px;
}
/* Floating Contact */
.floating-contact {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
}
.float-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--color-red);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, background var(--transition);
  text-decoration: none;
}
.float-btn:hover,
.float-btn:focus-visible {
  transform: scale(1.1);
  background: var(--color-gold);
  color: var(--color-dark);
}
/* Scroll Progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: var(--color-red);
  z-index: 999;
  width: 0%;
  transition: width 0.2s linear;
}
@media (prefers-reduced-motion: reduce) {
  .scroll-progress {
    display: none;
  }
}
/* Mobile Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
  }
  .header-logo {
    font-size: 1.4rem;
  }
  .mobile-nav-toggle {
    display: flex;
  }
  .header-nav {
    display: none;
    width: 100%;
    justify-content: center;
    background: var(--color-blue-light);
    border-radius: var(--radius-card);
    padding: 12px 0;
    margin-top: 8px;
  }
  .header-nav[data-open] {
    display: flex;
  }
  .nav-list {
    flex-direction: column;
    align-items: center;
    gap: 4px;
  }
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px 16px;
    font-size: 1rem;
  }
  .footer-links {
    gap: 16px;
  }
  .contact-info {
    flex-direction: column;
    gap: 8px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: center;
  }
  .floating-contact {
    bottom: 16px;
    right: 16px;
  }
  .float-btn {
    width: 44px;
    height: 44px;
    font-size: 0.65rem;
  }
}
@media (max-width: 480px) {
  .header-logo {
    font-size: 1.2rem;
  }
  .nav-link {
    font-size: 0.9rem;
  }
}
/* Utility for images placeholder (future use) */
.img-placeholder {
  background: linear-gradient(135deg, var(--color-blue) 0%, var(--color-red) 100%);
  border-radius: var(--radius-card);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-family: var(--font-data);
  font-size: 0.9rem;
  text-transform: uppercase;
}
/* Base button style */
.btn {
  display: inline-block;
  padding: 10px 28px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-white);
  background: var(--color-red);
  border: none;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background var(--transition), transform 0.2s, box-shadow var(--transition);
  text-decoration: none;
  text-align: center;
}
.btn:hover, .btn:focus-visible {
  background: var(--color-gold);
  color: var(--color-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}
/* Content section defaults */
.main-content {
  min-height: 60vh;
  padding: 40px 0;
}