/* =========================
   Base
========================= */
.markdown-content-style {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: #24292f;          /* GitHub text */
  background-color: #ffffff;
}

/* =========================
   Headings
========================= */
.markdown-content-style h1,
.markdown-content-style h2,
.markdown-content-style h3,
.markdown-content-style h4 {
  font-weight: 600;
  line-height: 1.35;
  margin: 1.6em 0 0.6em;
}

.markdown-content-style h1 {
  font-size: 1.8em;
  border-bottom: 1px solid #d0d7de;
  padding-bottom: 0.3em;
}

.markdown-content-style h2 {
  font-size: 1.4em;
  border-bottom: 1px solid #eaeef2;
  padding-bottom: 0.25em;
}

.markdown-content-style h3 {
  font-size: 1.15em;
}

/* =========================
   Paragraph / Inline
========================= */
.markdown-content-style p {
  margin: 0.8em 0;
}

.markdown-content-style strong {
  font-weight: 600;
}

.markdown-content-style em {
  font-style: italic;
}

.markdown-content-style del {
  color: #6e7781;
}

/* =========================
   Link
========================= */
.markdown-content-style a {
  color: #5154f0; /* GitHub green */
  text-decoration: none;
}

.markdown-content-style a:hover {
  text-decoration: underline;
}

/* =========================
   Table
========================= */
.markdown-content-style table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.95em;
}

.markdown-content-style th,
.markdown-content-style td {
  padding: 0.6em 0.8em;
  border: 1px solid #d0d7de;
  text-align: left;
}

.markdown-content-style th {
  background: linear-gradient(135deg, #f6f8fa, #ffffff);
  font-weight: 600;
}

.markdown-content-style tbody tr:nth-child(even) {
  background-color: #f6f8fa;
}

/* =========================
   List
========================= */
.markdown-content-style ul,
.markdown-content-style ol {
  padding-left: 1.5em;
  margin: 0.8em 0;
}

.markdown-content-style li {
  margin: 0.4em 0;
}

/* =========================
   Checkbox (Gradient Green)
   Structure-agnostic
========================= */
.markdown-content-style input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;

  width: 1.35em;
  height: 1.35em;

  border-radius: 6px;
  border: 2px solid #22c55e;
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);

  display: inline-grid;
  place-content: center;

  vertical-align: middle;
  margin-right: 0.4em;

  cursor: default;
}

/* チェックマーク */
.markdown-content-style input[type="checkbox"]::before {
  content: "";
  width: 0.4em;
  height: 0.75em;
  border-right: 2.5px solid #166534;
  border-bottom: 2.5px solid #166534;
  transform: rotate(45deg);
  opacity: 0;
}

/* checked */
.markdown-content-style input[type="checkbox"]:checked {
  background: linear-gradient(135deg, #4ade80, #22c55e);
  border-color: #16a34a;
}

.markdown-content-style input[type="checkbox"]:checked::before {
  opacity: 1;
}
/* =========================
   Blockquote (up to 3 levels)
========================= */

/* level 1 */
.markdown-content-style blockquote {
  margin: 1em 0;
  padding: 0.8em 1em;
  background-color: #f6f8fa;
  border-left: 4px solid #d0d7de;
  color: #57606a;
}

/* level 2 */
.markdown-content-style blockquote blockquote {
  margin-top: 0.8em;
  background-color: #ffffff;
  border-left-color: #22c55e; /* green accent */
  color: #374151;
}

/* level 3 */
.markdown-content-style blockquote blockquote blockquote {
  background-color: #f0fdf4;  /* very light green */
  border-left-color: #16a34a; /* deeper green */
  color: #065f46;
}
/* =========================
   Horizontal Rule
========================= */
.markdown-content-style hr {
  border: none;
  border-top: 1px solid #d0d7de;
  margin: 2em 0;
}