/* Base / Reset */
* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  line-height: 1.5;
  background: #111418;
  color: #e9eef3;
}

/* Theme variables */
:root {
  --bg: #111418;
  --text: #e9eef3;
  --muted: #a8b3be;

  --surface: rgba(255,255,255,0.05);
  --surfaceHover: rgba(255,255,255,0.09);
  --border: rgba(255,255,255,0.14);

  --accent: #03d0d0;
  --accentSoft: rgba(3,208,208,.14);
  --accentBorder: rgba(3,208,208,.38);

}

/* Header / Navigation */
header {
  padding: 18px;
}

.site-nav {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  column-gap: 28px;
}

.nav-group {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.nav-left {
  justify-content: flex-end;
  padding-right: 24px;
}

.nav-right {
  justify-content: flex-start;
  padding-left: 24px;
}

/* Logo */
.nav-logo {
  background: none;
  border: none;
  padding: 0;
  margin: 0 28px;
  text-decoration: none;
}

.nav-logo img {
  display: block;
  height: 56px;
  width: auto;
}

.nav-logo:hover {
  text-shadow: 0 0 12px rgba(3,208,208,0.35);
}

/* Nav buttons */
.site-nav a:not(.nav-logo) {
  display: inline-flex;
  align-items: center;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.site-nav a:not(.nav-logo):hover {
  background: var(--surfaceHover);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
}

.site-nav a.active {
  border-color: var(--accent);
  color: var(--accent);
}

.site-nav a[target="_blank"] {
  color: var(--muted);
}

.site-nav a[target="_blank"]:hover {
  color: var(--accent);
}

/* Main layout */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 72px 18px 0;
}

/* Shared components */
.section-divider {
  width: 100%;
  max-width: 900px;
  height: 1px;
  margin: 96px auto 0;
  background: linear-gradient(
    to right,
    transparent,
    color-mix(in srgb, var(--accent) 35%, var(--border)),
    transparent
  );
}

.section-subtitle {
  margin: 10px auto 0;
  color: var(--muted);
  max-width: 60ch;
  text-align: center;
}

.accent {
  color: var(--accent);
}

/*    Footer */
.site-footer {
  margin-top: 120px;
  padding: 32px 18px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-copy {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--accent);
}

/* ===============================
   Mobile
================================ */
@media (max-width: 720px) {
  .site-nav {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    justify-items: center;
    row-gap: 16px;
  }

  .nav-logo { order: 1; margin: 0; }
  .nav-left { order: 2; justify-content: center; }
  .nav-right { order: 3; justify-content: center; }
}

@media (max-width: 600px) {
  .footer-inner {
    justify-content: center;
    text-align: center;
  }
}