:root { color-scheme: light dark; --accent: #3a6b5c; }
* { box-sizing: border-box; }

body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  line-height: 1.6;
  color: #1c1c1c;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 2.2rem 0 1.8rem;
  margin-bottom: 2rem;
}

header a.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .01em;
  color: inherit;
  text-decoration: none;
}

nav a {
  color: #555;
  text-decoration: none;
  margin-left: 1.4rem;
  font-size: .88rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}
nav a:hover { color: var(--accent); }

.tagline { color: #666; font-size: 1.05rem; max-width: 32rem; margin-bottom: 3rem; }

h1 { font-size: 1.7rem; margin: 0 0 .4rem; }
h2 { font-size: 1.05rem; margin: 0 0 .3rem; }

.grid { display: grid; grid-template-columns: 1fr; gap: 1.6rem; margin-bottom: 3rem; }
@media (min-width: 640px) { .grid { grid-template-columns: 1fr 1fr; } }

.card {
  border: 1px solid #e4e4e4;
  border-radius: 10px;
  padding: 1.3rem 1.4rem;
}
.card .tag { color: var(--accent); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; margin-bottom: .4rem; display: block; }
.card p { color: #555; margin: .4rem 0 0; font-size: .93rem; }
.card a.more { font-size: .85rem; color: var(--accent); text-decoration: none; }

.post-body p { color: #333; margin: 0 0 1.1rem; }
.post-body { margin-top: 1.4rem; }

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #eee;
  color: #999;
  font-size: .8rem;
}

form.contact { margin-top: 1.5rem; display: grid; gap: .9rem; max-width: 26rem; }
form.contact label { font-size: .85rem; color: #555; display: block; margin-bottom: .3rem; }
form.contact input, form.contact textarea {
  width: 100%;
  padding: .6rem .7rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  font: inherit;
  background: #fff;
  color: #1c1c1c;
}
form.contact button {
  justify-self: start;
  padding: .6rem 1.3rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  cursor: pointer;
}

@media (prefers-color-scheme: dark) {
  body { color: #e2e2e2; }
  nav a { color: #999; }
  .tagline { color: #999; }
  .card { border-color: #2e2e2e; }
  .card p { color: #aaa; }
  .post-body p { color: #ccc; }
  footer { border-color: #2a2a2a; color: #777; }
  form.contact input, form.contact textarea { background: #1a1a1a; border-color: #333; color: #e2e2e2; }
}