:root {
  --bg: #000000;
  --paper: #000000;
  --ink: #00ff66;
  --muted: #00b84a;
  --line: #008a36;
  --link: #00ff66;
  --link2: #7dffb2;
  --shadow: rgba(0, 0, 0, 0.08);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  font-family: "MS PGothic", "MS Gothic", "Meiryo", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.7;
  background: var(--bg);
}

a { color: var(--link); text-decoration: underline; }
a:hover { color: var(--link2); }
a:visited { color: #00c954; }

.top {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  box-shadow: none;
}

.top__inner {
  max-width: none;
  margin: 0;
  padding: 10px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand__mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  font-weight: 700;
  border: 1px solid var(--line);
  background: #000;
  box-shadow: none;
  color: var(--ink);
}

.brand__title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.4px;
  font-family: "MS PGothic", "MS Gothic", "Meiryo", system-ui, -apple-system, "Segoe UI", sans-serif;
}

.brand__tag {
  font-size: 12px;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav a {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  text-decoration: underline;
  border-radius: 0;
}

.nav a:hover {
  background: transparent;
}

.wrap {
  max-width: 980px;
  margin: 16px auto;
  padding: 0 8px;
}

.layout {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.side {
  width: 260px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.side__title {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
}

.menu {
  display: block;
}

.menu__item {
  display: block;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}

.menu__item:hover {
  background: #001a0a;
}

.menu__folder {
  position: relative;
  outline: none;
}

.menu__item--folder {
  cursor: default;
}

.menu__item--folder::after {
  content: "\25B6";
  float: right;
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.menu__context {
  display: none;
  position: absolute;
  top: 6px;
  left: calc(100% - 2px);
  min-width: 220px;
  border: 1px solid var(--line);
  background: var(--paper);
  z-index: 20;
}

.menu__folder:hover .menu__context,
.menu__folder:focus-within .menu__context {
  display: block;
}

.menu__contextItem {
  display: block;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  background: transparent;
}

.menu__contextItem:hover {
  background: #001a0a;
}

.menu__path {
  font-weight: 700;
}

.menu__desc {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.main {
  flex: 1;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: none;
  padding: 16px;
}

.panel h1 {
  margin: 0 0 8px;
  font-size: 26px;
  font-size: 20px;
  font-family: "MS PGothic", "MS Gothic", "Meiryo", system-ui, -apple-system, "Segoe UI", sans-serif;
}

.note {
  color: var(--muted);
}

.grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.tile {
  display: block;
  padding: 10px 12px;
  background: #000;
  border: 1px solid var(--line);
  box-shadow: none;
  text-decoration: none;
  color: inherit;
  border-radius: 0;
}

.tile__title {
  font-weight: 700;
  letter-spacing: 0.3px;
  font-family: inherit;
}

.tile__desc {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.foot {
  margin: 20px 0 10px;
  color: var(--muted);
}

@media (max-width: 720px) {
  .layout {
    flex-direction: column;
  }

  .side {
    width: 100%;
  }

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