/* ============================================
   SDI Self-Guided Tour — Styles
   Brand colors from Simulation Dynamics Style Guide
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --sdi-dark: #225459;
  --sdi-teal: #7EB2BC;
  --sdi-light: #D6DAE1;
  --sdi-text: #373F3F;
  --sdi-coral: #DF6154;
  --sdi-bg: #f8f9fa;
  --sdi-white: #ffffff;
  --sdi-sidebar-width: 16rem;
  --sdi-content-max: 52rem;

  /* Grid dot colors matching the original images */
  --dot-customers: var(--sdi-teal);
  --dot-strategic: #F5A623;
  --dot-cases: #4CD964;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--sdi-text);
  background: var(--sdi-bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-weight: 700;
  color: var(--sdi-dark);
  line-height: 1.3;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; border-bottom: 2px solid var(--sdi-light); padding-bottom: 0.3em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 1rem; font-weight: 600; }

p {
  margin-bottom: 1em;
}

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

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

/* --- Page Shell --- */
.site-header {
  background: var(--sdi-dark);
  color: var(--sdi-white);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header img {
  height: 2.5rem;
}

.site-header .site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--sdi-white);
  white-space: nowrap;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--sdi-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}

.site-body {
  display: flex;
  flex: 1;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sdi-sidebar-width);
  background: var(--sdi-white);
  border-right: 1px solid var(--sdi-light);
  position: sticky;
  top: 3.5rem;
  height: calc(100vh - 3.5rem);
  overflow-y: auto;
  padding: 1rem 0;
  flex-shrink: 0;
}

.sidebar nav {
  padding: 0 0.5rem;
}

.sidebar a {
  display: block;
  padding: 0.35rem 0.75rem;
  color: var(--sdi-text);
  border-radius: 0.25rem;
  font-size: 0.9rem;
  transition: background 0.15s, color 0.15s;
}

.sidebar a:hover {
  background: rgba(126, 178, 188, 0.1);
  color: var(--sdi-dark);
  text-decoration: none;
}

.sidebar a.active {
  background: rgba(126, 178, 188, 0.15);
  color: var(--sdi-dark);
  font-weight: 600;
}

.sidebar-section {
  margin-bottom: 0.25rem;
}

.sidebar-section summary {
  display: flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--sdi-text);
  border-radius: 0.25rem;
  list-style: none;
  transition: background 0.15s;
}

.sidebar-section summary:hover {
  background: rgba(126, 178, 188, 0.1);
}

.sidebar-section summary::-webkit-details-marker {
  display: none;
}

.sidebar-section summary::before {
  content: '▸';
  display: inline-block;
  width: 1em;
  margin-right: 0.25rem;
  transition: transform 0.15s;
  font-size: 0.75rem;
}

.sidebar-section[open] > summary::before {
  transform: rotate(90deg);
}

.sidebar-section .children {
  padding-left: 1.25rem;
}

/* --- Main Content --- */
.content {
  flex: 1;
  min-width: 0;
  padding: 2rem 2.5rem;
  max-width: var(--sdi-content-max);
}

.content > h1:first-child {
  margin-top: 0;
}

/* --- Prose Styling (rendered markdown) --- */
.prose img {
  max-width: 60%;
  height: auto;
  border-radius: 0.5rem;
  margin: 1em 0;
}

.prose ul,
.prose ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.prose li {
  margin-bottom: 0.35em;
}

.prose blockquote {
  border-left: 4px solid var(--sdi-coral);
  padding: 0.75rem 1rem;
  margin: 1em 0;
  background: rgba(223, 97, 84, 0.05);
  border-radius: 0 0.25rem 0.25rem 0;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--sdi-light);
  margin: 2rem 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.8rem;
  line-height: 1.5;
}

.prose th,
.prose td {
  border: 1px solid var(--sdi-light);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.prose th {
  background: var(--sdi-dark);
  color: var(--sdi-white);
  font-weight: 600;
}

.prose code {
  background: rgba(34, 84, 89, 0.08);
  padding: 0.15em 0.35em;
  border-radius: 0.2em;
  font-size: 0.9em;
}

.prose strong {
  color: var(--sdi-dark);
}

.prose em {
  color: #555;
}

/* --- Callout Boxes (replacing > [!IMPORTANT]) --- */
.callout {
  border-left: 4px solid var(--sdi-teal);
  background: rgba(126, 178, 188, 0.08);
  padding: 0.75rem 1rem;
  margin: 1.25em 0;
  border-radius: 0 0.375rem 0.375rem 0;
  font-weight: 500;
  color: var(--sdi-dark);
}

/* --- Interactive Navigation Grid --- */
.nav-grid {
  background: var(--sdi-white);
  border: 1px solid var(--sdi-light);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
  overflow-x: auto;
}

.nav-grid table {
  border-collapse: collapse;
  width: 100%;
  min-width: 28rem;
}

.nav-grid th {
  font-size: 0.8rem;
  font-weight: 600;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0 0.75rem 0.75rem;
  text-align: center;
  border: none;
  background: none;
}

.nav-grid th:first-child {
  text-align: left;
}

.nav-grid td {
  padding: 0.5rem 0.75rem;
  text-align: center;
  border: none;
  background: none;
}

.nav-grid td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--sdi-text);
  font-size: 0.95rem;
}

.nav-grid .dot {
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.nav-grid .dot:hover {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px rgba(126, 178, 188, 0.2);
}

.nav-grid .dot.active {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px rgba(126, 178, 188, 0.3);
}

.nav-grid .dot-customers { background: var(--dot-customers); }
.nav-grid .dot-strategic { background: var(--dot-strategic); }
.nav-grid .dot-cases { background: var(--dot-cases); }

.nav-grid .dot.dimmed {
  opacity: 0.3;
}

.nav-grid .row-label {
  transition: opacity 0.2s;
}

.nav-grid .row-label.dimmed {
  opacity: 0.4;
}

/* --- Section Nav (breakout topics) --- */
.section-nav {
  background: var(--sdi-white);
  border: 1px solid var(--sdi-light);
  border-radius: 0.5rem;
  padding: 1rem 1.5rem;
  margin-bottom: 2rem;
}

.section-nav h4 {
  margin-top: 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #888;
  margin-bottom: 0.75rem;
}

.section-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.section-nav li {
  margin-bottom: 0.35rem;
}

.section-nav li::before {
  content: '';
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  margin-right: 0.5rem;
  vertical-align: middle;
}

.section-nav li.strategic::before {
  background: var(--dot-strategic);
}

.section-nav li.case-study::before {
  background: var(--dot-cases);
}

.section-nav a {
  color: var(--sdi-text);
  font-weight: 500;
}

.section-nav a:hover {
  color: var(--sdi-dark);
}

.section-nav .active a {
  color: var(--sdi-dark);
  font-weight: 700;
}

.section-nav .description {
  font-size: 0.8rem;
  color: #888;
  margin-left: 1.1rem;
}

/* --- Prev/Next Navigation --- */
.page-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--sdi-light);
}

.page-nav a {
  display: block;
  padding: 0.75rem 1rem;
  border: 1px solid var(--sdi-light);
  border-radius: 0.375rem;
  color: var(--sdi-text);
  transition: border-color 0.2s, background 0.2s;
}

.page-nav a:hover {
  border-color: var(--sdi-teal);
  background: rgba(126, 178, 188, 0.05);
  text-decoration: none;
}

.page-nav .label {
  font-size: 0.75rem;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.page-nav .title {
  font-weight: 600;
  color: var(--sdi-dark);
}

.page-nav .next {
  text-align: right;
}

/* --- Footer --- */
.site-footer {
  background: var(--sdi-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  margin-top: auto;
}

.site-footer a {
  color: var(--sdi-teal);
}

.site-footer img {
  height: 2rem;
  margin-bottom: 0.5rem;
}

/* --- Mobile Sidebar --- */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 40;
}

@media (max-width: 768px) {
  .hamburger {
    display: block;
  }

  .sidebar {
    position: fixed;
    left: -100%;
    top: 3.5rem;
    z-index: 50;
    transition: left 0.25s ease;
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.15);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-backdrop.open {
    display: block;
  }

  .content {
    padding: 1.25rem 1rem;
  }

  .site-header .site-title {
    font-size: 0.95rem;
  }

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

  .nav-grid {
    padding: 1rem;
  }
}

/* --- Print --- */
@media print {
  .sidebar, .site-header, .hamburger, .page-nav, .nav-grid, .section-nav {
    display: none !important;
  }
  .content {
    max-width: 100%;
    padding: 0;
  }
}