/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Roboto", "Helvetica", "Arial", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: #FFFFFF;
  background-color: #0A192F;
  -webkit-font-smoothing: antialiased;
}
:root {
  --clr-primary: #FF6B35;
  --clr-primary-dark: #CC4C1A;
  --clr-secondary: #0A192F;
  --clr-accent: #00B4D8;
  --clr-accent2: #9B59B6;
  --clr-neutral-dark: #1A1A2E;
  --clr-neutral-light: #E0E0E0;
  --clr-text-primary: #FFFFFF;
  --clr-text-secondary: #B0B0B0;
  --font-heading: "Impact", "Arial Black", sans-serif;
  --font-body: "Roboto", "Helvetica", "Arial", sans-serif;
  --header-height: 64px;
  --container-max: 1200px;
  --gap: 1.5rem;
}
a { color: var(--clr-accent); text-decoration: none; }
a:hover, a:focus-visible { color: var(--clr-primary); outline: 2px solid var(--clr-primary); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--font-heading); line-height: 1.1; font-weight: 900; letter-spacing: 0.02em; }
h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1rem; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* Skip Link */
.skip-link {
  position: absolute; top: -1000px; left: 0; z-index: 1000;
  background: var(--clr-primary); color: #0A192F; padding: 0.5rem 1rem;
  font-weight: bold; text-decoration: none;
}
.skip-link:focus { top: 0; outline: 2px solid var(--clr-accent); }

/* Container */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--gap); }

/* Grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--gap); }
.grid-item { background: var(--clr-neutral-dark); padding: var(--gap); border-radius: 4px; border-left: 4px solid var(--clr-primary); }

/* Buttons */
.btn {
  display: inline-block; padding: 0.75rem 2rem;
  font-family: var(--font-heading); font-size: 1rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: 0.05em;
  border: 2px solid var(--clr-primary); background: transparent; color: var(--clr-primary);
  transition: all 0.3s ease;
}
.btn:hover, .btn:focus-visible { background: var(--clr-primary); color: #0A192F; }
.btn--primary { background: var(--clr-primary); color: #0A192F; }
.btn--primary:hover { background: var(--clr-primary-dark); }

/* Breadcrumb */
.breadcrumb { padding: 1rem 0; font-size: 0.875rem; color: var(--clr-text-secondary); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.breadcrumb li::after { content: "/"; margin-left: 0.5rem; color: var(--clr-text-secondary); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--clr-accent); }
.breadcrumb [aria-current="page"] { color: var(--clr-text-primary); font-weight: bold; }

/* Header */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 100;
  background: var(--clr-secondary); border-bottom: 1px solid rgba(0,180,216,0.3);
  height: var(--header-height); display: flex; align-items: center;
}
.header-inner {
  max-width: var(--container-max); width: 100%; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; padding: 0 var(--gap);
}
.brand {
  font-family: var(--font-heading); font-size: 1.5rem; font-weight: 900;
  color: var(--clr-primary); text-transform: uppercase; letter-spacing: 0.05em;
}
.brand:hover { color: var(--clr-accent); }

.nav-links ul { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a {
  font-family: var(--font-body); font-weight: 700; font-size: 0.875rem;
  color: var(--clr-text-primary); text-transform: uppercase; letter-spacing: 0.08em;
  padding: 0.5rem 0; border-bottom: 2px solid transparent; transition: border-color 0.2s;
}
.nav-links a:hover, .nav-links a:focus-visible { border-bottom-color: var(--clr-primary); color: var(--clr-primary); }
.nav-links a[aria-current="page"] { border-bottom-color: var(--clr-primary); color: var(--clr-primary); }

/* Mobile Nav Toggle */
.nav-toggle { display: none; flex-direction: column; gap: 4px; padding: 0.5rem; }
.nav-toggle-bar { width: 24px; height: 2px; background: var(--clr-text-primary); display: block; transition: transform 0.2s; }
[data-open] ~ .nav-toggle .nav-toggle-bar:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
[data-open] ~ .nav-toggle .nav-toggle-bar:nth-child(2) { opacity: 0; }
[data-open] ~ .nav-toggle .nav-toggle-bar:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: var(--header-height); left: 0; width: 100%; height: calc(100vh - var(--header-height));
    background: var(--clr-neutral-dark); flex-direction: column; align-items: center;
    transform: translateX(100%); transition: transform 0.3s ease-in-out;
    overflow-y: auto;
  }
  .nav-links[data-open] { transform: translateX(0); }
  .nav-links ul { flex-direction: column; gap: 0; width: 100%; }
  .nav-links a { display: block; padding: 1rem 2rem; border-bottom: 1px solid rgba(0,180,216,0.2); width: 100%; text-align: center; }
  .nav-links a[aria-current="page"] { background: rgba(255,107,53,0.15); }
}

/* Footer */
.site-footer {
  background: var(--clr-neutral-dark); border-top: 2px solid var(--clr-primary);
  padding: 3rem 0 2rem; margin-top: 4rem;
}
.footer-inner {
  max-width: var(--container-max); margin: 0 auto; padding: 0 var(--gap);
  display: grid; grid-template-columns: 1fr 1fr 2fr; gap: 2rem;
}
.footer-brand .brand { font-size: 1.25rem; }
.footer-links ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { color: var(--clr-accent); font-size: 0.875rem; }
.footer-links a:hover { color: var(--clr-primary); }
.footer-info p, .footer-copyright p { font-size: 0.75rem; color: var(--clr-text-secondary); margin-bottom: 0.25rem; }
.footer-copyright { grid-column: 1 / -1; text-align: center; margin-top: 1rem; padding-top: 1rem; border-top: 1px solid rgba(0,180,216,0.2); }

@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-links ul { flex-direction: row; justify-content: center; gap: 1rem; }
}

/* Image Container (placeholder base) */
.img-container { position: relative; overflow: hidden; background: var(--clr-neutral-dark); aspect-ratio: 16 / 9; }
.img-container img { width: 100%; height: 100%; object-fit: cover; }

/* Back to Top */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 99;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--clr-primary); color: #0A192F;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover, .back-to-top:focus-visible { background: var(--clr-accent); color: #0A192F; }

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