@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap');

:root {
  --bg-main: #18181b;
  --bg-card: #27272a;
  --bg-input: #0f0f11;
  --border-color: #3f3f46;
  
  --text-main: #fafafa;
  --text-muted: #a1a1aa;
  --text-cream: #fef08a;
  
  --accent-amber: #d97706;
  --accent-hover: #b45309;
  
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max-width: 1200px;
}

html, body, div, span, h1, h2, h3, h4, p, a, ul, li, header, footer, nav, section, main, article, button, input {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: #18181b;
  background-color: var(--bg-main);
  color: #fafafa;
  color: var(--text-main);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-family: var(--font-heading);
  color: #fafafa;
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navigation */
.site-header {
  background-color: #18181b;
  background-color: var(--bg-main);
  border-bottom: 1px solid #3f3f46;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 75px;
}

.header-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.brand-logo {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: #fafafa;
  color: var(--text-main);
}

.brand-logo span {
  color: #d97706;
  color: var(--accent-amber);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  font-size: 0.92rem;
  color: #a1a1aa;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: #d97706;
  color: var(--accent-amber);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fafafa;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Buttons */
.btn-primary {
  background-color: #d97706;
  background-color: var(--accent-amber);
  color: #ffffff;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.88rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  background-color: #b45309;
  background-color: var(--accent-hover);
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  color: #fafafa;
  color: var(--text-main);
  border: 1px solid #3f3f46;
  border: 1px solid var(--border-color);
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  border-color: #d97706;
  border-color: var(--accent-amber);
  color: #d97706;
  color: var(--accent-amber);
}

/* Article Reading Layout */
.article-reading-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.toc-sidebar {
  position: sticky;
  top: 95px;
  align-self: start;
  background: #27272a;
  background: var(--bg-card);
  border: 1px solid #3f3f46;
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 8px;
}

.toc-title {
  font-size: 0.82rem;
  text-transform: uppercase;
  color: #d97706;
  color: var(--accent-amber);
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.toc-link {
  font-size: 0.88rem;
  color: #a1a1aa;
  color: var(--text-muted);
  transition: color 0.2s;
}

.toc-link.active, .toc-link:hover {
  color: #fafafa;
  color: var(--text-main);
  font-weight: 600;
}

/* Responsive Overrides */
@media (max-width: 868px) {
  .menu-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: 75px;
    right: -100%;
    width: 260px;
    height: calc(100vh - 75px);
    background-color: #27272a;
    background-color: var(--bg-card);
    border-left: 1px solid #3f3f46;
    border-left: 1px solid var(--border-color);
    flex-direction: column;
    padding: 2rem;
    transition: right 0.3s ease;
  }
  .nav-links.open { right: 0; }
  .article-reading-layout { grid-template-columns: 1fr; }
  .toc-sidebar { display: none; }
}