:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --bg-table-alt: #151515;
  --text-primary: #c8c4b8;
  --text-secondary: #7a7568;
  --accent: #6b8a5e;
  --accent-hover: #7d9e6e;
  --danger: #8b3a3a;
  --warning: #9e7a2e;
  --border: #2a2a24;
  --radius: 6px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* NAV */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

nav .brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  white-space: nowrap;
}

nav .links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav .links a {
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  transition: background 0.2s;
}

nav .links a:hover {
  background: var(--bg-card);
  text-decoration: none;
}

nav .links a.active {
  background: var(--bg-card);
  color: var(--accent);
}

nav .separator {
  color: var(--border);
  font-size: 0.8rem;
}

/* MAIN CONTENT */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* HEADINGS */
h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 2px solid var(--border);
  color: var(--text-primary);
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

p {
  margin-bottom: 1rem;
}

/* SUBTITLE */
.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* TABLE OF CONTENTS */
.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.toc h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toc ul {
  list-style: none;
  columns: 2;
  column-gap: 2rem;
}

.toc li {
  margin-bottom: 0.4rem;
}

.toc a {
  font-size: 0.95rem;
}

/* TABLES */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}

thead {
  background: var(--bg-card);
}

th {
  padding: 0.75rem 0.75rem;
  text-align: left;
  font-weight: 600;
  color: var(--accent);
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tbody tr:nth-child(even) {
  background: var(--bg-table-alt);
}

tbody tr:hover {
  background: var(--bg-card);
}

/* ITEM NAMES (monospace) */
.item-name {
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--warning);
}

/* CARDS */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s, transform 0.2s;
}

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

.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* DETAILS/SUMMARY (collapsible sections) */
details {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 1rem 0;
  padding: 0;
}

details[open] {
  padding-bottom: 1rem;
}

summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

summary::before {
  content: '\25B6';
  font-size: 0.7rem;
  transition: transform 0.2s;
  color: var(--accent);
}

details[open] > summary::before {
  transform: rotate(90deg);
}

summary::-webkit-details-marker {
  display: none;
}

details > *:not(summary) {
  padding: 0 1.25rem;
}

/* ALERT BOXES */
.alert {
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  border-left: 4px solid;
}

.alert-info {
  background: rgba(78, 204, 163, 0.1);
  border-color: var(--accent);
}

.alert-warning {
  background: rgba(240, 165, 0, 0.1);
  border-color: var(--warning);
}

.alert-danger {
  background: rgba(233, 69, 96, 0.1);
  border-color: var(--danger);
}

/* LISTS */
ul, ol {
  margin: 0.5rem 0 1rem 1.5rem;
}

li {
  margin-bottom: 0.3rem;
}

/* BADGES */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-level1 {
  background: rgba(78, 204, 163, 0.2);
  color: var(--accent);
}

.badge-level2 {
  background: rgba(240, 165, 0, 0.2);
  color: var(--warning);
}

.badge-level3 {
  background: rgba(233, 69, 96, 0.2);
  color: var(--danger);
}

/* SECTION ICONS */
.section-icon {
  width: 24px;
  height: 24px;
  vertical-align: middle;
  margin-right: 0.4rem;
  opacity: 0.85;
}

h2 .section-icon {
  width: 26px;
  height: 26px;
}

h1 .section-icon {
  width: 32px;
  height: 32px;
}

td .section-icon {
  width: 18px;
  height: 18px;
  margin-right: 0.3rem;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

footer a {
  color: var(--text-secondary);
}

footer a:hover {
  color: var(--accent);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  nav {
    padding: 0.5rem 1rem;
    gap: 0.75rem;
  }

  nav .links {
    gap: 0.5rem;
  }

  main {
    padding: 1.5rem 1rem 3rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  .toc ul {
    columns: 1;
  }

  table {
    font-size: 0.8rem;
  }

  th, td {
    padding: 0.5rem;
  }
}

@media (max-width: 480px) {
  nav .brand {
    font-size: 0.95rem;
  }

  nav .links a {
    font-size: 0.8rem;
    padding: 0.2rem 0.4rem;
  }

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

/* PRINT */
@media print {
  nav, footer {
    display: none;
  }

  body {
    background: white;
    color: black;
    font-size: 11pt;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .card, details, .toc, .alert {
    border: 1px solid #ccc;
    background: white;
  }

  table {
    border: 1px solid #ccc;
  }

  th {
    background: #f0f0f0;
    color: black;
  }

  td {
    border: 1px solid #ddd;
  }

  tbody tr:nth-child(even) {
    background: #f9f9f9;
  }

  h1, h2, h3, .accent {
    color: black;
  }
}