/* RESET & VARIABLES */
:root {
  /* Typography */
  --font-main: "Helvetica Neue", Helvetica, Arial, sans-serif;
  /* Fallback to system fonts for performance/simplicity */
  --font-mono: "Fira Code", monospace;

  --size-xs: 0.75rem;
  --size-s: 1rem;
  --size-m: 1.5rem;
  --size-l: 2rem;
  --size-xl: 3rem;
  --size-xxl: 5rem;

  /* Colors - Dark Theme by Default */
  --color-bg: #222;
  --color-bg-rgb: 34, 34, 34;
  --color-text: #f8f8f8;
  --color-text-light: #ccc;
  --color-accent: #ddd;
  --color-border: #444;

  /* Layout */
  --nav-height: 60px;
  --footer-height: 100px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

/* UTILITIES */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* LAYOUT SHELL */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--size-m);
  background: rgba(var(--color-bg-rgb), 0.9);
  /* slight transparency */
  /* backdrop-filter: blur(5px); */
  z-index: 1000;
  border-bottom: 1px solid transparent;
  /* Prepare for optional border */
}

.site-nav ul {
  display: flex;
  gap: var(--size-m);
}

.site-nav a {
  text-transform: uppercase;
  font-size: var(--size-xs);
  letter-spacing: 1px;
}

.site-nav a:hover {
  text-decoration: underline;
}

.site-main {
  flex: 1;
  padding-top: var(--nav-height);
  /* Space for fixed header */
  position: relative;
  /* For absolute positioned children */
}

.site-footer {
  padding: var(--size-m);
  border-top: 1px solid var(--color-border);
  font-size: var(--size-xs);
  color: var(--color-text-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-footer .contact-info {
  display: flex;
  gap: var(--size-s);
  align-items: center;
}

.site-footer .contact-info a {
  color: var(--color-text-light);
  font-size: 1.5rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
}

.site-footer .contact-info a:hover {
  color: var(--color-text);
}

.site-footer .credits a {
  color: var(--color-text-light);
  text-decoration: underline;
  transition: color 0.2s;
}

.site-footer .credits a:hover {
  color: var(--color-text);
}

/* RESPONSIVE BASE */
@media (max-width: 768px) {
  :root {
    --size-m: 1rem;
    --size-l: 1.5rem;
    --size-xl: 2rem;
  }
}

/* Breadcrumbs */
.site-breadcrumb ol {
  display: flex;
  gap: 0.5rem;
  font-size: var(--size-xs);
  color: var(--color-text-light);
  padding: var(--size-xs) var(--size-m);
  list-style: none;
  /* Ensure no bullets */
}

.site-breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-border);
}

.site-breadcrumb a:hover {
  text-decoration: underline;
}