:root {
  --wood-dark: #2a1f17;
  --wood-mid: #3d2e22;
  --wood-grain: #4a3728;
  --parchment: #d4c4a0;
  --parchment-light: #e2d5b8;
  --parchment-dark: #b8a882;
  --ink: #2c1810;
  --ink-light: #5c4033;
  --ink-faint: #8a7560;
  --wax: #8b3a2a;
  --wax-dark: #6b2a1a;
  --wax-highlight: #a84a35;
  --amber: #c4956a;
  --mist-glow: rgba(138, 154, 107, 0.15);
  --ember: #d4854a;
}

body {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: url("/assets/background-66efee96.jpg") center / cover no-repeat fixed;
  background-color: var(--wood-dark);
}

.den {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr;
  grid-template-columns: 1fr;
}

.den > nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(180deg, var(--wood-dark), var(--wood-grain));
  border-bottom: 2px solid rgba(0, 0, 0, 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  overflow-x: auto;

  & a, & button {
    font-family: inherit;
    font-size: 0.8125rem;
    color: var(--parchment-dark);
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border: none;
    background: none;
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s;

    &:hover {
      color: var(--parchment-light);
    }

    &.active {
      color: var(--parchment-light);
      background: rgba(255, 255, 255, 0.06);
      border-radius: 2px;
    }
  }

  & .spacer {
    flex: 1;
  }

  & .fragments {
    font-size: 0.75rem;
    color: var(--amber);
    padding: 0.4rem 0.75rem;
  }
}

.den > main {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sheet {
  background:
    radial-gradient(ellipse at 20% 10%, rgba(255, 255, 255, 0.08), transparent 60%),
    linear-gradient(170deg, var(--parchment-light), var(--parchment) 40%, var(--parchment-dark));
  padding: 1.5rem;
  position: relative;
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.25),
    0 8px 24px rgba(0, 0, 0, 0.3);

  &::before {
    content: "";
    position: absolute;
    inset: 5px;
    border: 1px solid var(--parchment-dark);
    pointer-events: none;
  }

  & h2 {
    font-size: 1.125rem;
    font-weight: normal;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--parchment-dark);
  }

  & a {
    color: var(--ink);
    text-underline-offset: 2px;

    &:hover {
      color: var(--wax);
    }
  }
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 1px;
  overflow: hidden;
  margin: 0.5rem 0;

  & > span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--amber), var(--ember));
    transition: width 0.3s;
  }
}

@media (max-width: 600px) {
  .den > nav {
    padding: 0.4rem 0.5rem;

    & a, & button {
      font-size: 0.75rem;
      padding: 0.35rem 0.5rem;
    }
  }

  .den > main {
    padding: 1rem;
  }

  .sheet {
    padding: 1rem;
  }
}