/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #0366d6;
  --color-primary-dark: #024ea4;
  --color-primary-light: #0969da;
  --color-bg: #ffffff;
  --color-sidebar-bg: #f6f8fa;
  --color-text: #24292e;
  --color-text-muted: #6a737d;
  --color-border: #e1e4e8;
  --color-border-light: #d0d7de;
  --color-warning-bg: #fffbdd;
  --color-warning-border: #f9c513;
  --color-code-bg: #f6f8fa;
  --color-code-border: #d0d7de;
  --color-success: #2da44e;
  --sidebar-width: 320px;
  --header-height: 56px;
  --content-max-width: 1400px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ===== Layout ===== */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  gap: var(--spacing-md);
  z-index: 100;
}

#sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background-color: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  z-index: 50;
}

#content {
  margin-top: var(--header-height);
  margin-left: var(--sidebar-width);
  margin-right: var(--spacing-xl);
  padding: var(--spacing-xl);
  max-width: var(--content-max-width);
}

/* ===== Header ===== */
#hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--color-text);
}

#logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

#logo {
  height: 36px;
  width: auto;
}

#logo-text {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-left: var(--spacing-sm);
}

#search-placeholder {
  flex: 1;
  /* Phase 2: Search box will go here */
}

/* ===== Track Picker ===== */
#track-picker {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-md);
}

#track-picker button {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
}

#track-picker button:hover {
  background-color: var(--color-sidebar-bg);
  border-color: var(--color-text-muted);
}

#track-picker button.active {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* ===== Navigation Tree ===== */
#nav-tree {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  flex: 1;
  overflow-y: auto;
  margin: 0 calc(-1 * var(--spacing-md));
  padding: 0 var(--spacing-md);
}

.nav-section {
  margin-bottom: var(--spacing-md);
}

.nav-section-header {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-sm);
}

.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  border-left: 3px solid transparent;
  color: var(--color-text);
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
  border-radius: 0 6px 6px 0;
}

.nav-item:hover {
  background-color: var(--color-border-light);
}

.nav-item.active {
  background-color: var(--color-primary-light);
  color: white;
  border-left-color: var(--color-primary-dark);
  font-weight: 500;
}

.nav-item.stub {
  opacity: 0.5;
  font-style: italic;
  cursor: default;
}

.nav-item.stub:hover {
  background-color: transparent;
}

.nav-item.stub::after {
  content: " (Coming soon)";
  font-size: 12px;
  color: var(--color-text-muted);
}

/* Nested items (Balloon children) */
.nav-children {
  margin-left: var(--spacing-md);
  margin-top: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.nav-group {
  margin-bottom: var(--spacing-sm);
}

.nav-group-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  border-left: 3px solid transparent;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
  border-radius: 0 6px 6px 0;
}

.nav-group-toggle:hover {
  background-color: var(--color-border-light);
}

.nav-group-toggle::after {
  content: "▶";
  font-size: 10px;
  transition: transform 0.2s;
}

.nav-group.expanded .nav-group-toggle::after {
  transform: rotate(90deg);
}

.nav-group.collapsed .nav-children {
  display: none;
}

/* ===== Main Content Typography ===== */
#content h1 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

#content h2 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border-light);
}

#content h3 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

#content h4 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

#content h5, #content h6 {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

#content p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

#content ul, #content ol {
  padding-left: 2em;
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

#content li {
  margin-bottom: var(--spacing-xs);
}

#content li > p {
  margin-bottom: var(--spacing-xs);
}

#content a {
  color: var(--color-primary);
  text-decoration: none;
}

#content a:hover {
  text-decoration: underline;
}

/* Code blocks */
#content pre {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: 6px;
  padding: var(--spacing-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
  font-size: 14px;
  line-height: 1.45;
}

#content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 85%;
}

#content pre code {
  background: none;
  padding: 0;
  border: none;
}

#content p code,
#content li code,
#content td code {
  background-color: rgba(175, 184, 193, 0.2);
  padding: 3px 6px;
  border-radius: 6px;
}

/* Tables */
#content table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: var(--spacing-md);
  overflow: auto;
  display: block;
}

#content table th,
#content table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  text-align: left;
}

#content table th {
  background-color: var(--color-sidebar-bg);
  font-weight: 600;
}

#content table tr:nth-child(even) {
  background-color: var(--color-sidebar-bg);
}

/* Blockquotes */
#content blockquote {
  margin: 0 0 var(--spacing-md) 0;
  padding: 0 var(--spacing-md);
  border-left: 4px solid var(--color-border);
  color: var(--color-text-muted);
}

/* Warning blockquotes (⚠️ pattern) */
#content blockquote:has(strong:first-child) {
  background-color: var(--color-warning-bg);
  border-left-color: var(--color-warning-border);
  padding: var(--spacing-md);
  border-radius: 6px;
}

#content blockquote p:first-child strong:first-child {
  color: var(--color-text);
}

/* Details/Summary */
#content details {
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-md);
}

#content summary {
  cursor: pointer;
  font-weight: 600;
  margin: calc(-1 * var(--spacing-md));
  padding: var(--spacing-md);
  user-select: none;
}

#content summary:hover {
  background-color: var(--color-sidebar-bg);
}

#content details[open] summary {
  margin-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

/* Horizontal rules */
#content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-xl) 0;
}

/* ===== Images ===== */
#content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

#content img[style*="display: block"] {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Landing Page ===== */
.landing {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.landing-logo {
  width: 200px;
  height: auto;
  margin-bottom: var(--spacing-lg);
}

.landing h1 {
  border-bottom: none;
  margin-bottom: var(--spacing-md);
}

.landing h2 {
  font-size: 20px;
  border-bottom: none;
  margin-top: var(--spacing-xl);
  text-align: left;
}

.landing ul {
  text-align: left;
}

.landing .cta {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md);
  background-color: var(--color-sidebar-bg);
  border-radius: 6px;
  font-weight: 500;
}

/* ===== Toast (Continue Where You Left Off) ===== */
#toast {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-text);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  z-index: 200;
  max-width: 500px;
  animation: slideUp 0.3s ease-out;
}

#toast.hidden {
  display: none;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translate(-50%, 20px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

#toast-message {
  flex: 1;
  font-size: 14px;
}

#toast button {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
}

#toast button:hover {
  background-color: var(--color-primary-dark);
}

#toast-dismiss {
  background-color: transparent !important;
  font-size: 20px;
  padding: 0 var(--spacing-sm);
}

#toast-dismiss:hover {
  background-color: rgba(255, 255, 255, 0.1) !important;
}

/* ===== Pinout FAB (Floating Action Button) ===== */
#pinout-fab {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.2s;
  z-index: 150;
}

#pinout-fab:hover {
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

#pinout-fab.hidden {
  display: none;
}

.fab-image {
  width: 80px;
  height: auto;
  border-radius: 4px;
  display: block;
}

.fab-label {
  color: var(--color-primary);
  font-weight: 600;
  padding-right: var(--spacing-xs);
}

/* ===== Pinout Modal ===== */
#pinout-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
}

#pinout-modal.hidden {
  display: none;
}

#pinout-modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  cursor: pointer;
}

#pinout-modal-content {
  position: relative;
  background-color: var(--color-bg);
  border-radius: 8px;
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
}

#pinout-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

#pinout-modal-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

#pinout-modal-close {
  background: none;
  border: none;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  padding: var(--spacing-xs);
  color: var(--color-text-muted);
  transition: color 0.2s;
}

#pinout-modal-close:hover {
  color: var(--color-text);
}

#pinout-modal-body {
  padding: var(--spacing-lg);
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

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

body.modal-open {
  overflow: hidden;
}

/* ===== Responsive (< 768px) ===== */
@media (max-width: 767px) {
  #hamburger {
    display: block;
  }

  #sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease-out;
  }

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

  #content {
    margin-left: 0;
    padding: var(--spacing-md);
  }

  body.sidebar-open::after {
    content: "";
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 40;
  }

  /* Pinout FAB - mobile adjustments */
  #pinout-fab {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .fab-image {
    display: none;
  }

  .fab-label {
    padding-right: 0;
  }

  /* Pinout Modal - mobile adjustments */
  #pinout-modal-content {
    max-width: 95vw;
    max-height: 95vh;
    margin: var(--spacing-sm);
  }

  #pinout-modal-body {
    padding: var(--spacing-md);
  }
}

/* ===== Print ===== */
@media print {
  #header,
  #sidebar,
  #toast,
  #pinout-fab,
  #pinout-modal {
    display: none !important;
  }

  #content {
    margin-left: 0;
    margin-top: 0;
    max-width: 100%;
  }

  #content h1 {
    page-break-before: always;
  }

  #content h1:first-child {
    page-break-before: avoid;
  }

  #content a {
    color: var(--color-text);
    text-decoration: underline;
  }

  #content pre,
  #content blockquote,
  #content table {
    page-break-inside: avoid;
  }
}