#rules {
  box-sizing: border-box;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 28px 40px;

  .rules_header {
    margin-bottom: 20px;

    .page_subtitle {
      margin: 0 0 6px;
    }

    p {
      margin: 0;
      color: #647181;
      line-height: 1.4;
    }
  }

  .rules_layout {
    display: grid;
    grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .rules_topics, .rule {
    min-width: 0;
    border: 1px solid #d8e0e8;
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(25, 48, 68, 0.06);
  }

  .rules_topics {
    padding: 16px;

    h3 {
      margin: 0 0 12px;
      color: #526171;
      font: 17px 'Acme';
    }
  }

  #rules_nav {
    display: grid;
    gap: 4px;
    margin: 0;
    list-style: none;

    .rule_nav_link {
      display: block;
      padding: 10px 12px;
      border-radius: 7px;
      color: #34475a;
      font: 16px 'Acme';
      text-decoration: none;

      &:hover, &:focus-visible {
        background: #eef5fb;
        color: #176b96;
      }

      &:focus-visible {
        outline: 2px solid var(--btn-primary);
        outline-offset: 2px;
      }

      &.selected {
        background: #eaf4fb;
        color: #176b96;
      }
    }
  }

  .rule {
    padding: 24px;
    color: #34475a;
    font-size: 16px;
    line-height: 1.6;
    overflow-wrap: anywhere;
    overflow-x: auto;

    h3 {
      margin: 0 0 18px;
      padding-bottom: 12px;
      border-bottom: 1px solid #e3e9ef;
      color: #263746;
      font: 28px 'Acme';
    }

    h4 {
      margin: 24px 0 8px;
      color: #263746;
      font: 21px 'Acme';
    }

    h5 {
      margin: 18px 0 6px;
      color: #34475a;
      font-size: 16px;
      font-weight: 700;
    }

    p {
      margin: 0 0 14px;
    }

    ul, ol {
      margin: 0 0 16px 24px;
      list-style-position: outside;
    }

    ul {
      list-style-type: disc;
    }

    ol {
      list-style-type: decimal;
    }

    li {
      margin-bottom: 6px;
    }

    a {
      color: #176b96;
      font-weight: 700;
      text-decoration: underline;

      &:hover {
        color: #0e4d71;
      }
    }

    strong {
      color: #263746;
      font-weight: 700;
    }

    em {
      font-style: italic;
    }

    .example {
      margin: 16px 0;
      padding: 14px 16px;
      border-left: 4px solid var(--btn-primary);
      border-radius: 0 8px 8px 0;
      background: #eef7fc;
      font-size: 0.9em;
    }

    .dictionary_intro {
      color: #526171;
      font-size: 17px;
    }

    .dictionary_note {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin: 18px 0 22px;
      padding: 14px 16px;
      border: 1px solid #b9dbea;
      border-radius: 9px;
      background: #eef8fc;

      i {
        flex: none;
        margin-top: 4px;
        color: #238cb9;
        font-size: 18px;
      }

      p {
        margin: 0;
      }
    }

    .dictionary_list {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-bottom: 26px;
    }

    .dictionary_entry {
      scroll-margin-top: 70px;
      padding: 16px;
      border: 1px solid #d8e0e8;
      border-radius: 9px;
      background: #f8fafb;

      &.selected {
        border-color: #1686bb;
        background: linear-gradient(135deg, #f2fbff 0%, #dff4fc 100%);
        box-shadow: 0 0 0 3px rgba(41, 182, 246, 0.2);
      }

      h4 {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 10px;
        margin: 0 0 7px;
        color: #176b96;
        font-size: 19px;
      }

      .dictionary_current {
        flex: none;
        padding: 4px 7px;
        border-radius: 999px;
        background: #1686bb;
        color: #fff;
        font: 11px Arial, sans-serif;
        font-weight: 700;
        letter-spacing: 0.025em;
        text-transform: uppercase;
      }

      p {
        margin: 0;
        font-size: 14px;
        line-height: 1.5;
      }
    }

    .achievement_guide_heading {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 22px;
      padding-bottom: 18px;
      border-bottom: 1px solid #e3e9ef;

      h3 {
        margin-bottom: 8px;
        padding: 0;
        border: 0;
      }
    }

    .achievement_intro {
      max-width: 620px;
      margin: 0;
      color: #526171;
      font-size: 17px;
    }

    .achievement_guide_link {
      display: inline-flex;
      flex: none;
      align-items: center;
      gap: 7px;
      min-height: 40px;
      padding: 0 13px;
      border: 1px solid #1686bb;
      border-radius: 8px;
      background: var(--btn-primary);
      color: #102f40;
      font: 15px 'Acme';
      text-decoration: none;

      &:hover,
      &:focus-visible {
        background: #56c6f7;
        color: #102f40;
        text-decoration: none;
      }
    }

    .achievement_basics {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
      margin-bottom: 24px;

      section {
        padding: 16px;
        border: 1px solid #d8e0e8;
        border-radius: 9px;
        background: #f8fafb;
      }

      > section > i {
        color: #238cb9;
        font-size: 20px;
      }

      h4 {
        margin: 8px 0 5px;
        font-size: 18px;
      }

      p {
        margin: 0;
        color: #526171;
        font-size: 14px;
        line-height: 1.5;
      }

      .fa-gem {
        color: var(--token-text);
      }
    }

    .achievement_rules_note,
    .achievement_page_help {
      margin-bottom: 22px;

      h4 {
        margin-top: 0;
      }
    }

    .achievement_rules_note {
      padding: 16px 18px;
      border-left: 4px solid #29b6f6;
      border-radius: 0 9px 9px 0;
      background: #eef8fc;

      p:last-child {
        margin-bottom: 0;
      }
    }

    .achievement_categories {
      padding-top: 4px;
      border-top: 1px solid #e3e9ef;

      > h4 {
        margin-bottom: 4px;
      }
    }

    .achievement_categories_intro {
      color: #647181;
    }

    .achievement_category_list {
      display: grid;
      gap: 12px;
    }

    .achievement_category {
      padding: 16px;
      border: 1px solid #d8e0e8;
      border-radius: 9px;
      background: #fff;
    }

    .achievement_category_heading {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;

      h5 {
        margin: 0;
        color: #263746;
        font: 19px 'Acme';
      }

      span {
        flex: none;
        padding: 4px 8px;
        border-radius: 999px;
        background: #eef4f8;
        color: #526171;
        font-size: 11px;
        font-weight: 700;
        text-transform: uppercase;
      }
    }

    .achievement_category_description {
      margin: 7px 0 12px;
      color: #647181;
      font-size: 14px;

      p {
        margin: 0;
      }
    }

    .achievement_goal_names {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin: 0;
      list-style: none;

      li {
        margin: 0;
        padding: 5px 8px;
        border: 1px solid #dce5eb;
        border-radius: 6px;
        background: #f8fafb;
        color: #526171;
        font-size: 12px;
      }
    }

    img {
      max-width: 100%;
      height: auto;
    }

    pre {
      max-width: 100%;
      overflow-x: auto;
    }
  }
}

@media (max-width: 700px) {
  #rules {
    padding: 20px 14px 32px;

    .rules_layout {
      grid-template-columns: 1fr;
      gap: 14px;
    }

    .rules_topics {
      padding: 14px;
    }

    #rules_nav {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;

      .rule_nav_link {
        padding: 8px 10px;
      }
    }

    .rule {
      padding: 18px;

      .dictionary_list {
        grid-template-columns: 1fr;
      }

      .achievement_guide_heading {
        flex-direction: column;
      }

      .achievement_basics {
        grid-template-columns: 1fr;
      }
    }
  }
}