/* CSS Variables */
:root {
  /* Base colors */
  --color-text: #1a1a1a;
  --color-background: #ffffff;
  --color-border: #e0e0e0;
  --color-accent: #0366d6;
  --color-image-background: #ffffff;

  /* Alert colors */
  --color-note: #0969da;
  --color-tip: #1a7f37;
  --color-warning: #9a6700;
  --color-severe: #bc4c00;
  --color-caution: #d1242f;
  --color-important: #8250df;

  /* Stackup colors */
  --stackup-bg: white;
  --stackup-text: #000000;
  --stackup-connector: #666666;
  --stackup-border: black;
  --stackup-fr4: #6d744b;
  --stackup-ptfe: #fcfcfa;
  --stackup-polyimide: #cd8200;
  --stackup-phenolic: #5c1106;
  --stackup-aluminum: #d5d5d5;
  --stackup-silkscreen: #FFFFFF;
  --stackup-solder-mask: #00A650;
  --stackup-copper: #FF8C00;
  --stackup-paste: #f0f0f0;
  --stackup-default: #808080;

  /* Navbar */
  --navbar-height: 48px;
  --navbar-background: #ffffff;
  --navbar-text: #1a1a1a;
  --navbar-border: #e0e0e0;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas,
    Liberation Mono, monospace;
  --line-height-base: 1.5;
  --line-height-heading: 1.2;
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
}

/* Dark mode color scheme */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #ffffff;
    --color-background: #121212;
    --color-border: #333333;
    --color-accent: #58a6ff;
    --color-image-background: #121212;

    --color-note: #2f81f7;
    --color-tip: #3fb950;
    --color-warning: #d29922;
    --color-severe: #db6d28;
    --color-caution: #f85149;
    --color-important: #a371f7;

    --navbar-background: #1a1a1a;
    --navbar-text: #ffffff;
    --navbar-border: #333333;
  }
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Light mode styles */
body.light-mode {
  --color-text: #1a1a1a;
  --color-background: #ffffff;
  --color-border: #e0e0e0;
  --color-accent: #0366d6;
  --color-image-background: #ffffff;

  --color-note: #0969da;
  --color-tip: #1a7f37;
  --color-warning: #9a6700;
  --color-severe: #bc4c00;
  --color-caution: #d1242f;
  --color-important: #8250df;

  --stackup-bg: white;
  --stackup-text: #000000;
  --stackup-connector: #666666;
  --stackup-border: black;
  --stackup-fr4: #6d744b;
  --stackup-ptfe: #fcfcfa;
  --stackup-polyimide: #cd8200;
  --stackup-phenolic: #5c1106;
  --stackup-aluminum: #d5d5d5;
  --stackup-silkscreen: #FFFFFF;
  --stackup-solder-mask: #00A650;
  --stackup-copper: #FF8C00;
  --stackup-paste: #f0f0f0;
  --stackup-default: #808080;

  --navbar-background: #ffffff;
  --navbar-text: #1a1a1a;
  --navbar-border: #e0e0e0;

  background-color: var(--color-background);
  color: var(--color-text);
}

/* Dark mode styles */
body.dark-mode {
  --color-text: #ffffff;
  --color-background: #121212;
  --color-border: #333333;
  --color-accent: #58a6ff;
  --color-image-background: #121212;

  --color-note: #2f81f7;
  --color-tip: #3fb950;
  --color-warning: #d29922;
  --color-severe: #db6d28;
  --color-caution: #f85149;
  --color-important: #a371f7;

  --stackup-bg: #121212;
  --stackup-text: #e0e0e0;
  --stackup-connector: #888888;
  --stackup-border: #444444;
  --stackup-fr4: #4a4a3a;
  --stackup-ptfe: #a0a0a0;
  --stackup-polyimide: #8b5a00;
  --stackup-phenolic: #3a0a04;
  --stackup-aluminum: #a0a0a0;
  --stackup-silkscreen: #333333;
  --stackup-solder-mask: #005533;
  --stackup-copper: #cc6600;
  --stackup-paste: #444444;
  --stackup-default: #505050;

  --navbar-background: #1a1a1a;
  --navbar-text: #ffffff;
  --navbar-border: #333333;

  background-color: var(--color-background);
  color: var(--color-text);
}

/* ========== NAVBAR ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background-color: var(--navbar-background);
  color: var(--navbar-text);
  border-bottom: 1px solid var(--navbar-border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  z-index: 1000;
  gap: 8px;
  font-size: var(--font-size-sm);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.navbar-toggle {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--navbar-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color 0.15s;
}

.navbar-toggle:hover {
  background-color: rgba(128, 128, 128, 0.1);
}

.navbar-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 500;
  opacity: 0.85;
  display: flex;
  align-items: center;
  gap: 6px;
}

.navbar-title span {
  white-space: nowrap;
}

.navbar-title .sep {
  opacity: 0.3;
  font-weight: 300;
}

.navbar-theme-toggle {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--navbar-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color 0.15s;
}

.navbar-theme-toggle:hover {
  background-color: rgba(128, 128, 128, 0.1);
}

body.dark-mode .navbar-theme-toggle svg {
  transform: rotate(40deg);
}

.sun-moon {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

/* ========== TOC DRAWER ========== */
.toc-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1099;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

body.toc-open .toc-backdrop {
  opacity: 1;
  visibility: visible;
}

.toc {
  position: fixed;
  left: 0;
  top: 0;
  width: 280px;
  height: 100%;
  padding: calc(var(--navbar-height) + 16px) 16px 16px;
  background: var(--color-background);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  font-size: 13px;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  box-shadow: 4px 0 16px rgba(0, 0, 0, 0.1);
}

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

.toc a {
  display: block;
  padding: 8px 12px;
  color: var(--color-text);
  text-decoration: none;
  opacity: 0.65;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-radius: 6px;
  transition: opacity 0.2s, background-color 0.2s;
}

.toc a:hover {
  opacity: 1;
  background: rgba(128, 128, 128, 0.08);
}

body.dark-mode .toc a:hover {
  background: rgba(255, 255, 255, 0.05);
}

.toc a.active {
  opacity: 1;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(3, 102, 214, 0.06);
}

body.dark-mode .toc a.active {
  background: rgba(88, 166, 255, 0.08);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  line-height: var(--line-height-heading);
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
h6 {
  font-size: var(--font-size-base);
}

code,
pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
}

/* Lists */
ul,
ol {
  margin-bottom: 1.5em;
  padding-left: 1.5em;
  max-width: 70ch;
}

ul {
  list-style-type: disc;
}

ol {
  list-style-type: decimal;
}

li {
  margin-bottom: 0.5em;
}

/* ========== LAYOUT ========== */
.container {
  margin-top: var(--navbar-height);
  padding: 2rem 2rem;
  height: calc(100vh - var(--navbar-height));
  margin-left: auto;
  margin-right: auto;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}

section {
  scroll-snap-align: start;
  min-height: calc(100vh - var(--navbar-height));
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  padding: 3rem 2rem;
  box-sizing: border-box;
}

/* Custom scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(128, 128, 128, 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(128, 128, 128, 0.5);
}

/* ========== TABLES ========== */
table {
  table-layout: auto;
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.5rem 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
  align-self: stretch;
}

body.dark-mode table {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

th,
td {
  word-wrap: break-word;
  padding: 12px 16px;
  vertical-align: middle;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
}

th:last-child,
td:last-child {
  border-right: none;
}

tr:last-child td {
  border-bottom: none;
}

th {
  background-color: rgba(128, 128, 128, 0.04);
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--color-border);
}

body.dark-mode th {
  background-color: rgba(255, 255, 255, 0.03);
}

tr:nth-child(even) {
  background-color: rgba(128, 128, 128, 0.015);
}

tr:hover td {
  background-color: rgba(128, 128, 128, 0.04);
  transition: background-color 0.15s ease;
}

body.dark-mode tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Ensure images inside tables scale properly */
td > div.image-wrapper,
td > div.svg-inline,
td > div.stackup-inline {
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 100%;
}

td img,
td svg {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0;
}

/* ========== IMAGES ========== */
img {
  cursor: pointer;
  max-width: 100%;
  height: auto;
}

.svg-inline {
  cursor: pointer;
  max-width: 100%;
  display: block;
  border-radius: 6px;
  overflow: hidden;
}

.svg-inline svg {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Stackup styling */
.stackup-inline {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--color-border);
  background-color: var(--stackup-bg);
  padding: 15px;
}

body.dark-mode .stackup-inline {
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.4);
}

.stackup-inline svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.svg-container {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--color-image-background);
  padding: 0;
  border-radius: 4px;
  line-height: 0;
}

/* ========== MODAL ========== */
.modal {
  display: flex;
  opacity: 0;
  pointer-events: none;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.98);
  padding: 0;
  box-sizing: border-box;
  overflow: hidden;
  cursor: pointer;
  transition: opacity 0.25s ease-out, visibility 0.25s ease-out;
  visibility: hidden;
  justify-content: center;
  align-items: center;
}

body.dark-mode .modal {
  background-color: rgba(18, 18, 18, 0.98);
}

.modal.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.modal-content-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.modal-content {
  position: relative;
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  margin: auto;
  cursor: pointer;
  transform: scale(0.96);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-label {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 16px;
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.85);
  color: #ffffff;
  font-size: 13px;
  font-weight: 500;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: opacity 0.3s ease;
}

body.modal-open {
  overflow: hidden;
}

.dark-mode .modal,
.dark-mode .modal-content-container {
  background-color: var(--color-background);
}

/* Drill layer styling */
.dark-mode .drill-layer {
  filter: invert(1) brightness(1.5);
}

/* ========== LINKS ========== */
a {
  color: var(--color-accent, #0366d6);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent, #0366d6);
  text-decoration: underline;
}

body.dark-mode a {
  color: var(--color-accent, #58a6ff);
}

body.dark-mode a:hover {
  color: var(--color-accent, #58a6ff);
}

/* ========== TYPOGRAPHY ========== */
p {
  margin-bottom: 1.5em;
  line-height: 1.6;
}

pre {
  margin-top: 1.5em;
  margin-bottom: 1.5em;
  padding: 1.2rem;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  line-height: 1.6;
}

/* ========== ALERTS ========== */
.markdown-alert {
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  color: inherit;
  border-left: .25em solid #888;
  border-radius: 6px;
  background-color: rgba(128, 128, 128, 0.05);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.markdown-alert>:first-child {
  margin-top: 0
}

.markdown-alert>:last-child {
  margin-bottom: 0
}

.markdown-alert .markdown-alert-title {
  display: flex;
  font-weight: 600;
  align-items: center;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.markdown-alert .markdown-alert-title .octicon {
  margin-right: 0.5rem;
  display: inline-block;
  overflow: visible !important;
  vertical-align: text-bottom;
  fill: currentColor;
}

.markdown-alert.markdown-alert-note {
  border-left-color: var(--color-note);
  background-color: rgba(9, 105, 218, 0.04);
}

.markdown-alert.markdown-alert-note .markdown-alert-title {
  color: var(--color-note);
}

.markdown-alert.markdown-alert-important {
  border-left-color: var(--color-important);
  background-color: rgba(130, 80, 223, 0.04);
}

.markdown-alert.markdown-alert-important .markdown-alert-title {
  color: var(--color-important);
}

.markdown-alert.markdown-alert-warning {
  border-left-color: var(--color-warning);
  background-color: rgba(154, 103, 0, 0.04);
}

.markdown-alert.markdown-alert-warning .markdown-alert-title {
  color: var(--color-warning);
}

.markdown-alert.markdown-alert-tip {
  border-left-color: var(--color-tip);
  background-color: rgba(26, 127, 55, 0.04);
}

.markdown-alert.markdown-alert-tip .markdown-alert-title {
  color: var(--color-tip);
}

.markdown-alert.markdown-alert-caution {
  border-left-color: var(--color-caution);
  background-color: rgba(209, 36, 47, 0.04);
}

.markdown-alert.markdown-alert-caution .markdown-alert-title {
  color: var(--color-caution);
}

/* ========== CODE FENCES ========== */
.named-fence-block {
  position: relative;
  padding-top: 2em;
}

.named-fence-filename {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0 4px;
  font-weight: bold;
  color: #000000;
  background: #c0c0c0;
  opacity: 0.6;
}

/* ========== MATH ========== */
math[display="block"] {
  overflow-x: auto;
  padding: 1rem 2rem;
  text-align: left;
  font-size: 1.1em;
}

mtext {
  margin-left: 1ch;
  margin-right: 1ch;
  display: inline;
}

/* ========== ACCESSIBILITY ========== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: #fff;
  padding: 8px 16px;
  z-index: 10000;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========== MOBILE RESPONSIVE ========== */
@media (max-width: 768px) {
  :root {
    --navbar-height: 48px;
  }

  .container {
    padding: 1rem;
    height: auto;
    overflow-y: visible;
    scroll-snap-type: none;
  }

  section {
    padding: 1rem 0;
    min-height: auto;
    scroll-snap-align: none;
  }

  h1 {
    font-size: var(--font-size-2xl);
  }
  h2 {
    font-size: var(--font-size-xl);
  }
  h3 {
    font-size: var(--font-size-lg);
  }

  ul, ol {
    max-width: 100%;
  }

  /* Tables stack vertically on mobile */
  table,
  thead,
  tbody,
  th,
  td,
  tr {
    display: block;
  }

  thead {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  table {
    border: none;
    box-shadow: none;
    overflow: visible;
  }

  tr {
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
    background: var(--color-background);
  }

  body.dark-mode tr {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  }

  td {
    border: none;
    border-bottom: 1px solid rgba(128, 128, 128, 0.1);
    padding: 0.75rem 1rem;
    text-align: left;
  }

  td:last-child {
    border-bottom: none;
  }

  td::before {
    content: attr(data-label);
    display: block;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.6;
    margin-bottom: 0.25rem;
    color: var(--color-text);
  }

  td:empty::before {
    display: none;
  }

  /* Remove desktop hover effects on mobile */
  tr:hover td {
    background-color: transparent;
  }

  tr:nth-child(even) {
    background-color: transparent;
  }

  /* Images full width on mobile */
  .svg-inline,
  .svg-inline svg,
  .stackup-inline,
  .stackup-inline svg {
    width: 100% !important;
    max-width: 100% !important;
  }

  img {
    width: 100%;
    max-width: 100%;
    height: auto;
  }

  /* Math overflow handling */
  math[display="block"] {
    padding: 0.5rem 0.5rem;
    font-size: 1em;
  }

  /* TOC drawer full width on very small screens */
  .toc {
    width: 85vw;
    max-width: 320px;
  }

  /* Modal adjustments */
  .modal-content {
    max-width: 95%;
    max-height: 95%;
  }

  .modal-label {
    font-size: 12px;
    padding: 6px 12px;
    bottom: 12px;
  }
}

/* ========== PRINT ========== */
@media print {
  body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: var(--color-background) !important;
    color: var(--color-text) !important;
  }

  body * {
    color: var(--color-text) !important;
  }

  body.dark-mode {
    background-color: var(--color-background) !important;
    color: var(--color-text) !important;
  }

  .modal, .toc, .toc-backdrop,
  .navbar, .navbar-toggle, .navbar-theme-toggle {
    display: none !important;
  }

  .container {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    overflow: visible;
    height: auto;
    padding-bottom: 60px;
  }

  section {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    page-break-before: always;
    page-break-after: always;
    page-break-inside: avoid;
    min-height: auto;
    height: auto;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  section:first-of-type {
    page-break-before: avoid;
  }

  section:last-of-type {
    page-break-after: avoid;
  }

  .svg-container {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    page-break-inside: avoid;
  }

  img {
    max-width: 100%;
    width: auto;
    height: auto;
    display: block;
    margin: 0 auto;
    page-break-inside: avoid;
    max-height: 90vh;
  }

  td img {
    max-width: 100%;
    width: auto;
    height: auto;
    max-height: 90vh;
  }

  table {
    margin-left: auto;
    margin-right: auto;
    page-break-inside: avoid;
    width: 100%;
    max-width: 100%;
  }

  ul, ol {
    margin-left: auto;
    margin-right: auto;
    page-break-inside: avoid;
  }

  p {
    margin-left: auto;
    margin-right: auto;
  }

  pre, code {
    background-color: #f6f8fa !important;
    color: #1a1a1a !important;
    page-break-inside: avoid;
  }

  a {
    color: #0366d6 !important;
  }
}