/* Reset & Variables */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Brand Colors */
  --color-primary: #0A192F;
  --color-accent: #D4AF37;
  --color-card-bg: #1A2A4A;
  --color-cta: #FF6B35;
  --color-light-bg: #F5F0EB;
  --color-text: #2D2D2D;
  --color-text-light: #8C8C8C;
  --color-border: #4A4A4A;
  --color-white: #FFFFFF;

  /* Typography */
  --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-body: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --fw-bold: 900;
  --fw-normal: 300;
  --fw-light: 100;
  --fs-heading: clamp(1.5rem, 4vw, 3rem);
  --fs-body: 1rem;
  --fs-small: 0.75rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-slow: 0.4s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: var(--fw-normal);
  background-color: var(--color-primary);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Focus */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-accent);
  color: var(--color-primary);
  padding: var(--space-sm) var(--space-md);
  z-index: 10000;
  font-weight: 700;
  border-radius: 0 0 4px 4px;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 0;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header-logo {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.5rem;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* Navigation toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: 1001;
}
.nav-toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Navigation */
.site-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-slow), opacity var(--transition-slow);
  padding: var(--space-lg) var(--space-md);
}
.site-nav[data-open="true"] {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.nav-list a {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.125rem;
  color: var(--color-white);
  text-decoration: none;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}
.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-accent);
}
.nav-list a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Scroll progress */
.scroll-progress {
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cta));
  width: 0%;
  position: absolute;
  bottom: -3px;
  left: 0;
  transition: width 50ms linear;
}

/* Main content offset */
#main-content {
  padding-top: var(--header-height);
}

/* Footer */
.site-footer {
  background-color: var(--color-primary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) var(--space-md) var(--space-lg);
  margin-top: var(--space-xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}
@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

.footer-logo {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-size: var(--fs-small);
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}

.footer-icp {
  font-size: var(--fs-small);
  color: var(--color-text-light);
}

.footer-nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.footer-nav a {
  color: var(--color-white);
  text-decoration: none;
  font-size: var(--fs-body);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}
.footer-nav a:hover,
.footer-nav a:focus-visible {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.footer-contact p {
  font-size: var(--fs-small);
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
}
.footer-contact a {
  color: var(--color-accent);
  text-decoration: none;
}
.footer-contact a:hover {
  text-decoration: underline;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: var(--space-lg) auto 0;
  text-align: center;
  font-size: var(--fs-small);
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
}

/* Utility classes */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Button */
.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1rem;
  padding: var(--space-sm) var(--space-lg);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  border-radius: 0; /* sharp corners */
}
.btn-primary {
  background-color: var(--color-cta);
  color: var(--color-white);
  border-color: var(--color-cta);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}

/* Image placeholder base */
.image-placeholder {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: var(--fs-small);
  aspect-ratio: 16/9;
  width: 100%;
  height: auto;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* Mobile-first: larger screens */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
  .site-nav {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    border-bottom: none;
    padding: 0;
    background: transparent;
  }
  .nav-list {
    flex-direction: row;
    gap: var(--space-lg);
  }
  .nav-list a {
    font-size: 1rem;
    border-bottom: none;
  }
  .scroll-progress {
    bottom: -1px;
  }
}

/* Print */
@media print {
  .site-header,
  .scroll-progress {
    position: static;
  }
  #main-content {
    padding-top: 0;
  }
}