:root {
  --parchment:   #ece3d0;  /* page background  */
  --parchment-2: #f4ecdb;  /* card background  */
  --bark:        #3a2c1d;  /* darkest brown    */
  --loam:        #5c4631;  /* mid brown        */
  --moss:        #586647;  /* muted green      */
  --moss-deep:   #3f4a33;
  --gold:        #b08d57;  /* accent           */
  --gold-soft:   #c9aa6e;
  --ink:         #2e2519;  /* body text        */
  --ink-soft:    #5b4f3e;

  --sidebar-width: 260px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--serif);
  color: var(--ink);
  background-color: var(--parchment);
  background-image:
    radial-gradient(circle at 20% 0%, rgba(176, 141, 87, 0.08), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(88, 102, 71, 0.10), transparent 55%);
  line-height: 1.6;
}

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  flex: 0 0 var(--sidebar-width);
  background: linear-gradient(180deg, var(--loam) 0%, var(--bark) 100%);
  color: var(--parchment);
  padding: 2rem 1.5rem;
  border-right: 3px solid var(--gold);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}

.sidebar-crest {
  text-align: center;
  font-size: 2rem;
  color: var(--gold-soft);
  margin-bottom: 0.25rem;
}

.site-title {
  margin: 0;
  text-align: center;
  font-size: 2rem;
  letter-spacing: 0.08em;
  color: var(--parchment);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.site-tagline {
  margin: 0.25rem 0 1.75rem;
  text-align: center;
  font-size: 0.8rem;
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
}

.site-tagline::after {
  content: "";
  display: block;
  width: 60%;
  height: 1px;
  margin: 1rem auto 0;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav li { margin: 0.35rem 0; }

.nav a {
  display: block;
  padding: 0.6rem 0.9rem;
  color: var(--parchment);
  text-decoration: none;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  border-left: 3px solid transparent;
  border-radius: 2px;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.nav a::before {
  content: "\2767";
  color: var(--gold-soft);
  margin-right: 0.6rem;
  opacity: 0;
  transition: opacity 0.18s ease;
}

.nav a:hover,
.nav a:focus {
  background-color: rgba(176, 141, 87, 0.18);
  border-left-color: var(--gold);
  color: #fff;
}

.nav a:hover::before,
.nav a:focus::before { opacity: 1; }

.nav a.is-active {
  background-color: rgba(176, 141, 87, 0.28);
  border-left-color: var(--gold);
  color: #fff;
}

.nav a.is-active::before { opacity: 1; }

.sidebar-footer {
  margin-top: auto;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.7rem;
  color: var(--gold-soft);
  opacity: 0.8;
}

.sidebar-footer p { margin: 0; }

.content {
  flex: 1 1 auto;
  padding: 3rem clamp(1.5rem, 5vw, 4rem);
  max-width: 70rem;
}

.hero {
  border-bottom: 2px solid var(--gold);
  padding-bottom: 1.5rem;
  margin-bottom: 2.5rem;
}

.hero-heading {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--bark);
  letter-spacing: 0.02em;
}

.hero-sub {
  margin: 0.5rem 0 0;
  font-size: 1.1rem;
  font-style: italic;
  color: var(--ink-soft);
}

.panel {
  background: var(--parchment-2);
  border: 1px solid rgba(58, 44, 29, 0.18);
  border-top: 3px solid var(--moss);
  border-radius: 4px;
  padding: 1.75rem 2rem;
  margin-bottom: 1.75rem;
  box-shadow: 0 2px 6px rgba(58, 44, 29, 0.10);
}

.panel-heading {
  margin: 0 0 0.75rem;
  font-size: 1.5rem;
  color: var(--moss-deep);
}

.panel-heading::before {
  content: "\25C6";
  color: var(--gold);
  margin-right: 0.5rem;
  font-size: 0.8em;
  vertical-align: middle;
}

.placeholder {
  margin: 0;
  color: var(--ink-soft);
}

code {
  background: rgba(58, 44, 29, 0.10);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}

@media (max-width: 700px) {
  .layout { flex-direction: column; }

  .sidebar {
    width: 100%;
    flex-basis: auto;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 3px solid var(--gold);
  }

  .nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.25rem;
  }

  .sidebar-footer { margin-top: 1.5rem; }
}