/* RidgeRelay - Chapter 6 assignment-safe stylesheet
   - External CSS file (no inline styles)
   - Multi-page site with consistent layout and navigation
*/

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #fbfbfb;
  color: #1a1a1a;
  font-family: "Source Sans 3", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}

/* Skip link (accessibility polish) */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: #ffffff;
  border: 1px solid #dddddd;
  padding: 0.5rem 0.75rem;
}

.skip-link:focus,
.skip-link:focus-visible {
  left: 1rem;
  top: 1rem;
}

/* Header with subtle concept background */
.site-header {
  position: relative;
  background: #ffffff;
  border-bottom: 1px solid #dddddd;
  overflow: hidden;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("concept_background.png");
  background-size: cover;
  background-position: center;
  opacity: 0.08; /* keep your chosen value here */
  pointer-events: none;
}

.site-header .container {
  position: relative;
}

.header-flex {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-link {
  display: inline-block;
}

.logo-link:hover {
  opacity: 0.9;
}

.site-logo {
  width: 95px;
  height: auto;
}

.site-title {
  margin: 0;
  font-family: "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 2rem;
}

.title-link {
  text-decoration: none;
  color: inherit;
}

.title-link:hover,
.title-link:focus {
  text-decoration: underline;
}

.site-tagline {
  margin: 0.25rem 0 0;
  font-size: 1.05rem;
}

/* Navigation */
.site-nav {
  background: #fafafa;
  border-bottom: 1px solid #dddddd;
}

.site-nav a {
  display: inline-block;
  margin-right: 1rem;
  padding: 0.75rem 0;
  text-decoration: none;
  color: #1a1a1a;
  font-weight: 500;
  white-space: nowrap;
}

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

.site-nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration: underline;
  border-bottom: 2px solid #1a1a1a;
}

/* Clear keyboard focus (strict-professor friendly) */
a:focus,
a:focus-visible {
  outline: 2px solid #1a1a1a;
  outline-offset: 3px;
}

/* Main content */
.site-main {
  padding-top: 0.5rem;
}

.site-main h2,
.site-main h3 {
  font-family: "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.25;
}

section {
  margin-top: 1.5rem;
}

/* Cards */
.card {
  background: #ffffff;
  border: 1px solid #e2e2e2;
  padding: 1rem;
  margin: 1rem 0;
}

.meta {
  margin-top: -0.25rem;
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid #dddddd;
  margin-top: 2rem;
  background: #ffffff;
  font-size: 0.95rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
  padding: 1rem 0;
}