:root {
  --green-primary: #4caf50;
  --green-dark: #388e3c;
  --green-darker: #2e7d32;
  --sidebar-width: 260px;
  --text-color: #1f2a24;
  --muted-text: #5c6b63;
  --border-color: #e2e8e4;
  --bg-color: #ffffff;
  --sidebar-bg: #388e3c;
  --sidebar-text: #f2f7f3;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

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

a {
  color: var(--green-darker);
}

a:hover {
  color: var(--green-dark);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.img-portrait {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}

.content video {
  display: block;
  width: 100%;
  height: auto;
  margin: 1rem 0;
  border-radius: 6px;
  background: #000;
}

/*
 * Shows only the middle 40% (vertically) of an image, cropping 30% off
 * the top and 30% off the bottom without distorting the image.
 * Usage: <div class="crop-middle" style="--crop-aspect: <img-width>/<img-height * 0.4>;">
 *          <img src="..." alt="...">
 *        </div>
 * --crop-aspect must be the image's natural width divided by 40% of its
 * natural height (e.g. a 3024x4032 photo -> 3024 / (4032 * 0.4) = 15/8).
 */
.crop-middle {
  overflow: hidden;
  position: relative;
  aspect-ratio: var(--crop-aspect, 16 / 9);
  border-radius: 6px;
}

.crop-middle img {
  position: absolute;
  top: -75%;
  left: 0;
  width: 100%;
  border-radius: 0;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-brand {
  padding: 0 1.25rem 1.25rem;
  font-weight: 700;
  font-size: 1.05rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  margin-bottom: 0.75rem;
}

.sidebar-brand a {
  color: var(--sidebar-text);
  text-decoration: none;
}

.nav-list, .nav-sublist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: 0.5rem 1.25rem;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  font-weight: 600;
  border-left: 3px solid #fff;
  padding-left: calc(1.25rem - 3px);
}

.nav-group-title {
  display: block;
  padding: 0.9rem 1.25rem 0.35rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.65);
}

.nav-sublist .nav-link {
  padding-left: 2rem;
}

.nav-sublist .nav-link.active {
  padding-left: calc(2rem - 3px);
}

.nav-toggle {
  display: none;
}

.nav-backdrop {
  display: none;
}

/* Content */
.content {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem;
  max-width: 900px;
}

.content h1 {
  margin-top: 0;
  color: var(--green-darker);
}

.content h2 {
  margin-top: 2.25rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--border-color);
  color: var(--green-dark);
}

.content blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 4px solid var(--green-primary);
  background: #f1f8f1;
  color: var(--text-color);
}

.content em {
  color: var(--muted-text);
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}

.content table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
}

.content th,
.content td {
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.7rem;
  text-align: left;
}

.content th {
  background: #f1f8f1;
  color: var(--green-darker);
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  color: var(--muted-text);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    position: fixed;
    top: 0.9rem;
    left: 1rem;
    z-index: 30;
    width: 38px;
    height: 34px;
    background: var(--sidebar-bg);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
  }

  .nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background: #fff;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 25;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 20;
  }

  .nav-backdrop.visible {
    display: block;
  }

  .content {
    padding: 4.5rem 1.5rem 2.5rem;
    max-width: 100%;
  }
}