:root {
  --ink: #1f1e1a;
  --paper: #f9f4ea;
  --line: #d8ccb4;
  --muted: #5d5a52;
  --card: rgba(255, 253, 248, 0.93);
  --shadow: 0 18px 46px rgba(31, 30, 26, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background:
    radial-gradient(circle at 90% 2%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 42%),
    radial-gradient(circle at 10% 100%, color-mix(in srgb, var(--accent-soft) 28%, transparent), transparent 44%),
    var(--paper);
}

.shell {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(10px);
  background: rgba(249, 244, 234, 0.88);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.wordmark {
  text-decoration: none;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: "Fraunces", "Times New Roman", serif;
  font-weight: 700;
  font-size: 1.15rem;
}

.menu {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.menu a {
  text-decoration: none;
  color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: 999px;
  background: #fff;
  padding: 0.34rem 0.72rem;
  font-size: 0.9rem;
}

.menu a:hover,
.menu a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.hero {
  padding: 4.4rem 0 2.4rem;
}

.hero h1 {
  margin: 0;
  font-family: "Fraunces", "Times New Roman", serif;
  line-height: 1.06;
  letter-spacing: 0.01em;
  font-size: clamp(2.1rem, 6.1vw, 4rem);
}

.hero p {
  margin: 0.92rem 0 0;
  max-width: 70ch;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.18rem);
}

.hero-chips {
  margin-top: 1.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.hero-chips span {
  border-radius: 999px;
  padding: 0.34rem 0.72rem;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--line));
  background: color-mix(in srgb, var(--accent-soft) 35%, #fff);
}

.cta-row {
  margin-top: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.72rem;
}

.btn {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.65rem 0.96rem;
  font-size: 0.92rem;
  font-weight: 600;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-secondary {
  color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  background: #fff;
}

.cluster-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
  margin: 1.4rem 0 2.8rem;
}

.cluster-card {
  grid-column: span 6;
  text-decoration: none;
  color: var(--ink);
  border-radius: 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 1rem;
}

.cluster-card h2 {
  margin: 0;
  font-family: "Fraunces", "Times New Roman", serif;
  font-size: 1.25rem;
}

.cluster-card p {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

.cluster-card:hover,
.cluster-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.surface {
  border-radius: 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 1rem 1.05rem;
  margin: 1rem 0;
}

.surface h2 {
  margin: 0;
  font-family: "Fraunces", "Times New Roman", serif;
}

.surface ol,
.surface ul {
  margin: 0.75rem 0 0;
  padding-left: 1.15rem;
}

.surface li {
  margin-bottom: 0.45rem;
}

.faq details {
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: 12px;
  padding: 0.62rem 0.76rem;
  margin-top: 0.55rem;
  background: #fff;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.article h2 {
  margin-top: 1.8rem;
  font-family: "Fraunces", "Times New Roman", serif;
}

.article p,
.article li {
  font-size: 1rem;
}

.doc-frame {
  width: 100%;
  min-height: 72vh;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: 12px;
  background: #fff;
}

footer {
  border-top: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  margin-top: 2.8rem;
  padding: 1rem 0 2rem;
  font-size: 0.9rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .cluster-card {
    grid-column: span 12;
  }
}

@media (max-width: 640px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}