:root {
  --bg: #0f1216;
  --panel: #171b21;
  --panel-hover: #1d232b;
  --text: #e7ecf3;
  --muted: #9aa6b2;
  --accent: #4f9cff;
  --border: #262d36;
  --radius: 10px;
  --sidebar-w: 240px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- header --- */
.site-header {
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 1rem 1.5rem;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tagline {
  color: var(--muted);
  font-size: 0.9rem;
}

/* --- layout --- */
.layout {
  display: flex;
  align-items: flex-start;
  min-height: calc(100vh - 120px);
}

/* --- sidebar --- */
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  border-right: 1px solid var(--border);
  padding: 1rem 0.75rem;
  position: sticky;
  top: 0;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.sidebar-link:hover {
  background: var(--panel);
  color: var(--text);
}

.sidebar-link.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: inset 3px 0 0 var(--accent);
}

.sidebar-link .num {
  flex: 0 0 1.4rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.sidebar-link.home {
  margin-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding-bottom: 0.7rem;
}

/* --- main view --- */
.view {
  flex: 1 1 auto;
  padding: 1.75rem 2rem;
  max-width: 960px;
}

.hero h2 {
  font-size: 1.9rem;
  margin: 0 0 0.4rem;
}

.lede {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.5rem;
}

/* --- card grid (home) --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  text-align: center;
  height: 180px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1rem 1.2rem;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.card:hover {
  background: var(--panel-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-num {
  position: absolute;
  top: 0.7rem;
  right: 0.9rem;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 700;
}

.card-icon {
  font-size: 2.4rem;
  line-height: 1;
  margin-bottom: 0.7rem;
}

.card-title {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.card-owner {
  margin-top: auto;
  color: var(--muted);
  font-size: 0.85rem;
}

.card-owner::before {
  content: "Owner: ";
  color: #5f6b78;
}

/* --- detail view --- */
.back-link {
  display: inline-block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.back-link:hover {
  color: var(--accent);
}

.detail-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.detail-num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
}

.detail-head h2 {
  margin: 0.1rem 0 0.3rem;
  font-size: 1.7rem;
}

.detail-owner {
  margin: 0;
  color: var(--muted);
}

.detail-note {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-style: italic;
}

.detail-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  margin: 1rem 0;
}

.detail-block h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
}

.sub-list {
  margin: 0;
  padding-left: 1.2rem;
}

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

code {
  background: #0b0e12;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1rem 0.35rem;
  font-size: 0.85em;
}

/* --- footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  color: var(--muted);
}

/* --- responsive --- */
@media (max-width: 700px) {
  .layout {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    flex-basis: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    position: static;
  }
  .sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .view {
    padding: 1.25rem;
  }
}