*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --lake:    #0c6b8f;
  --lake-mid:#0a8fb5;
  --sky:     #e8f6fb;
  --dark:    #0d1a22;
  --mid:     #2a3f4d;
  --muted:   #607080;
  --white:   #ffffff;
  --accent:  #00c4b3;
}
html { scroll-behavior: smooth; }
body { font-family: 'Inter', sans-serif; color: var(--dark); background: var(--white); line-height: 1.65; }

.obf span { display: none; }

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(12,107,143,.1);
}
.nav-logo { font-size: 1.3rem; font-weight: 800; letter-spacing: -.5px; color: var(--lake); text-decoration: none; }
.nav-logo span { color: var(--accent); }
.nav-back { color: var(--lake); font-size: .875rem; font-weight: 600; text-decoration: none; }
.nav-back:hover { text-decoration: underline; }

main { max-width: 760px; margin: 0 auto; padding: 8rem 2rem 5rem; }
h1 { font-size: 2.2rem; font-weight: 800; letter-spacing: -.03em; margin-bottom: 2.5rem; }
h2 { font-size: 1.1rem; font-weight: 700; margin: 2rem 0 .4rem; color: var(--lake); }
h3 { font-size: 1rem; font-weight: 700; margin: 1.25rem 0 .4rem; }
p { font-size: .95rem; color: var(--mid); margin-bottom: .6rem; }
ul { padding-left: 1.4rem; margin-bottom: .75rem; }
ul li { font-size: .925rem; color: var(--mid); margin-bottom: .3rem; }
a { color: var(--lake); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: none; border-top: 1px solid rgba(12,107,143,.1); margin: 2rem 0; }

.highlight-box {
  background: var(--sky); border-left: 3px solid var(--lake-mid);
  padding: 1rem 1.25rem; border-radius: 0 8px 8px 0;
  margin: 1rem 0 1.25rem;
}
.highlight-box p { margin: 0; font-size: .9rem; }
.intro { font-size: .9rem; color: var(--muted); margin-bottom: 2.5rem; }

footer {
  background: var(--dark); color: rgba(255,255,255,.7);
  text-align: center; padding: 2rem; font-size: .85rem;
}
.footer-logo { font-size: 1.1rem; font-weight: 800; color: var(--white); margin-bottom: .5rem; }
.footer-logo span { color: var(--accent); }
footer a { color: rgba(255,255,255,.85); text-decoration: none; }
footer a:hover { color: var(--white); }

.skip-link {
  position: absolute; left: 0; top: -100%;
  background: var(--accent); color: var(--dark);
  padding: .5rem 1.25rem; font-weight: 600;
  text-decoration: none; z-index: 200;
}
.skip-link:focus { top: 0; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

@media(max-width:600px){ nav { padding: .875rem 1.25rem; } main { padding: 6rem 1.25rem 4rem; } }