/* mytcp talk — ink + moss, not purple-glow defaults */

:root {
  --bg: #0c1218;
  --ink: #e8efe9;
  --muted: #8fa099;
  --accent: #3dba8b;
  --accent-dim: #2a7a5c;
  --warn: #d4a574;
  --panel: rgba(20, 32, 28, 0.85);
  --line: rgba(61, 186, 139, 0.28);
  --empty: rgba(255, 255, 255, 0.06);
  --filled: rgba(61, 186, 139, 0.14);
}

html.reveal-full-page,
.reveal-viewport {
  background: var(--bg);
}

.reveal {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 36px;
  color: var(--ink);
}

.reveal h1,
.reveal h2,
.reveal h3 {
  font-family: Fraunces, Georgia, serif;
  font-weight: 700;
  text-transform: none;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.reveal h1 {
  font-size: 2.4em;
  margin: 0.15em 0 0.35em;
}

.reveal h2 {
  font-size: 1.55em;
  margin-bottom: 0.6em;
}

.reveal h3 {
  font-size: 0.85em;
  margin: 0 0 0.4em;
}

.reveal .brand {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.55em;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.reveal .subtitle {
  font-size: 0.8em;
  color: var(--muted);
  max-width: 24em;
  margin: 0 auto 1em;
  line-height: 1.35;
}

.reveal .meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.42em;
  color: var(--muted);
}

.reveal .tagline {
  font-family: "Fraunces", Georgia, serif;
  font-style: italic;
  font-size: 0.6em;
  color: var(--accent);
  max-width: 30em;
  margin: 0.4em auto 0;
  line-height: 1.4;
}

.reveal .section-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.4em;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5em;
}

.reveal .lede {
  font-family: Fraunces, Georgia, serif;
  font-size: 1.05em;
  font-weight: 500;
  line-height: 1.35;
  color: var(--ink);
}

.reveal .soft {
  color: var(--muted);
  font-size: 0.82em;
}

.reveal .note-line {
  margin-top: 1em;
  font-size: 0.8em;
  color: var(--warn);
}

.reveal .punch {
  margin-top: 0.9em;
  font-family: Fraunces, Georgia, serif;
  font-size: 0.85em;
  color: var(--accent);
}

.reveal .caption {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.5em;
  color: var(--muted);
  margin-top: 0.75em;
}

.reveal ul,
.reveal ol {
  display: block;
  margin: 0 auto;
  text-align: left;
  width: fit-content;
  max-width: 90%;
}

.reveal li {
  margin: 0.35em 0;
  line-height: 1.3;
}

.reveal code {
  font-family: "IBM Plex Mono", monospace;
  background: rgba(61, 186, 139, 0.12);
  padding: 0.08em 0.28em;
  border-radius: 0.2em;
  color: var(--accent);
}

.reveal :not(pre) > code + code {
  margin-left: 0.35em;
}

.reveal .code-path {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.45em;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin: 0 0 0.5em;
}

.reveal pre {
  box-sizing: border-box;
  box-shadow: none;
  background: #12181c;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8em 1em;
  width: 100%;
  margin: 0 0 0.6em;
  font-size: 0.6em;
  line-height: 1.38;
  text-align: left;
}

.reveal pre code .hljs-comment {
  color: #9fb8a8;
  font-style: normal;
}

.reveal pre code {
  max-height: 460px;
  text-align: left;
}

.reveal pre code {
  background: transparent;
  color: #e8efe9;
  padding: 0;
  max-height: none;
  tab-size: 4;
  white-space: pre !important;
}

.reveal .hljs {
  background: transparent;
  white-space: pre !important;
  tab-size: 4;
}

/* highlight.js line-numbers table must keep indent */
.reveal .hljs-ln-code,
.reveal td.hljs-ln-code,
.reveal .hljs-ln-code .hljs-ln {
  white-space: pre !important;
  tab-size: 4;
}

/* stepped code (data-line-numbers="1-3|4-6"): the comments carry the story,
   so no numbers; lines outside the current step dim */
.reveal .hljs-ln-numbers {
  display: none;
}

.reveal .hljs.has-highlights tr:not(.highlight-line) {
  opacity: 0.3;
}

/* each step is a copy of the code stacked over the first; it must sit inside
   the padding and hide the copy underneath */
.reveal pre.code-wrapper {
  position: relative;
}

.reveal pre.code-wrapper code.hljs.fragment {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: inherit;
  border-radius: inherit;
  background: #12181c;
}

.reveal .hljs.has-highlights tr {
  transition: opacity 0.3s ease;
}

.reveal .hljs-ln-numbers {
  color: #5a6a62;
  padding-right: 0.8em !important;
  white-space: nowrap !important;
}

.reveal table.hljs-ln {
  border-collapse: collapse;
  width: auto;
}

.reveal table.hljs-ln td {
  border: none;
  padding: 0;
}

.reveal pre.big-code {
  font-size: 0.85em;
  text-align: center;
  background: transparent;
  border: none;
}

.reveal pre.big-code code {
  color: var(--accent);
  background: rgba(61, 186, 139, 0.1);
  padding: 0.4em 0.7em;
  border-radius: 0.3em;
}

.reveal pre.diagram-code {
  font-size: 0.64em;
}

.reveal pre.diagram-code.strace {
  font-size: 0.52em;
  line-height: 1.35;
}

.reveal blockquote {
  background: var(--panel);
  border-left: 4px solid var(--accent);
  box-shadow: none;
  width: 90%;
  margin: 0.5em auto;
  padding: 0.7em 1em;
  font-size: 0.95em;
  line-height: 1.5;
  color: var(--ink);
}

.reveal .black-box {
  margin: 1.2em auto;
  max-width: 16em;
  padding: 1.2em 1.5em;
  background: linear-gradient(135deg, #1a2228, #0a0e12);
  border: 1px dashed var(--muted);
  border-radius: 0.4em;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7em;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.reveal .two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2em;
  text-align: left;
  font-size: 0.92em;
}

.reveal .two-col h3.ok { color: var(--accent); }
.reveal .two-col h3.no { color: var(--warn); }

.reveal .goals {
  font-size: 0.92em;
}

.reveal table.compact {
  font-size: 0.75em;
  margin: 0.5em auto;
  border-collapse: collapse;
  width: 100%;
}

.reveal table.compact td,
.reveal table.compact th {
  border-bottom: 1px solid var(--line);
  padding: 0.45em 0.6em;
  text-align: left;
}

.reveal table.compact th {
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
  font-size: 0.9em;
}

.reveal table.mono-ish td:first-child {
  font-family: "IBM Plex Mono", monospace;
  color: var(--accent);
}

.reveal .lab-diagram {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2em;
  font-size: 0.8em;
}

.reveal .lab-diagram .box {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.45em 1.2em;
  border-radius: 0.3em;
  min-width: 12em;
  text-align: center;
}

.reveal .lab-diagram .box.accent {
  border-color: var(--accent);
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95em;
}

.reveal .lab-diagram .arrow {
  color: var(--muted);
  font-size: 0.9em;
}

.reveal .lab-diagram .bidirectional {
  color: var(--accent);
  font-size: 0.75em;
  margin: 0.2em 0;
}

/* —— annotated hexdumps —— */
.reveal pre.hexdump {
  font-size: 0.47em;
  line-height: 1.3;
  padding: 0.6em 1em;
  margin-bottom: 0.5em;
}

.reveal pre.hexdump code {
  color: #5d6d66;
}

/* one hue per layer, the same on every slide; within a layer, fields
   alternate between banded (1) and plain (2) so boundaries stay visible */
.reveal .eth1  { --c: #9dd4ff; --t: rgba(124, 196, 255, 0.24); }
.reveal .eth2  { --c: #7cc4ff; }
.reveal .arp1  { --c: #f6e87e; --t: rgba(241, 224, 90, 0.2); }
.reveal .arp2  { --c: #e6d44e; }
.reveal .ip1   { --c: #ffc98f; --t: rgba(255, 184, 107, 0.24); }
.reveal .ip2   { --c: #f0a656; }
.reveal .icmp1 { --c: #86ece3; --t: rgba(94, 224, 214, 0.2); }
.reveal .icmp2 { --c: #4fd3c8; }
.reveal .tcp1  { --c: #dcb6f5; --t: rgba(199, 146, 234, 0.26); }
.reveal .tcp2  { --c: #bb86e2; }
.reveal .http1, .reveal .app1 { --c: #9ceba6; --t: rgba(127, 220, 138, 0.2); }
.reveal .http2, .reveal .app2 { --c: #6fd07b; }
.reveal .tls1  { --c: #ff9cad; --t: rgba(255, 122, 144, 0.24); }
.reveal .tls2  { --c: #f56a83; }
.reveal .f0    { --c: #5d6d66; }

.reveal pre.hexdump code span[class] {
  color: var(--c);
  background: var(--t, transparent);
  border-radius: 3px;
}

/* stepped layers: always visible; a wrap layer is grey until its step, a peel
   layer turns grey on its step */
.reveal .slides section pre.hexdump span.fragment:is(.wrap, .peel) {
  opacity: 1;
  visibility: inherit;
  transition: color 0.5s ease, background-color 0.5s ease;
}

.reveal pre.hexdump code span.fragment.wrap:not(.visible),
.reveal pre.hexdump code span.fragment.peel.visible {
  color: #5d6d66;
  background: transparent;
}

/* their table rows stay in place, dimmed until the layer arrives */
.reveal .slides section tr.fragment.dim-in {
  opacity: 0.3;
  visibility: inherit;
  transition: opacity 0.5s ease;
}

.reveal .slides section tr.fragment.dim-in.visible {
  opacity: 1;
}

/* plain fields get a hollow chip, banded ones a filled chip */
.reveal .chip:is(.eth2, .arp2, .ip2, .icmp2, .tcp2, .http2, .app2, .tls2) {
  background: transparent;
  box-shadow: inset 0 0 0 2px var(--c);
}

.reveal a.jump {
  color: inherit;
  text-decoration: underline dotted var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

.reveal a.jump:hover {
  color: var(--accent);
}

.reveal pre.hexdump.tight {
  font-size: 0.42em;
  line-height: 1.25;
  margin-bottom: 0.3em;
}

/* preamble google frames: long hex + field table on one slide */
.reveal .slides section.hex-dense h2 {
  font-size: 1.15em;
  margin-bottom: 0.35em;
  padding-bottom: 0.15em;
}

.reveal .slides section.hex-dense .code-path {
  font-size: 0.4em;
  margin: 0 0 0.25em;
}

.reveal .slides section.hex-dense pre.hexdump.tight {
  font-size: 0.34em;
  line-height: 1.2;
  padding: 0.35em 0.7em;
  margin-bottom: 0.15em;
}

.reveal .slides section.hex-dense table.compact.hexlegend {
  font-size: 0.34em;
  margin: 0.15em 0;
}

.reveal .slides section.hex-dense table.compact.hexlegend td,
.reveal .slides section.hex-dense table.compact.hexlegend th {
  padding: 0.1em 0.45em;
}

.reveal .slides section.hex-dense .hexnote {
  font-size: 0.42em;
  margin-top: 0.15em;
  max-width: 88%;
}

.reveal .chip {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  border-radius: 3px;
  margin-right: 0.2em;
  vertical-align: -0.1em;
  background: var(--c, currentColor);
}

.reveal .slides section table.compact.hexlegend {
  font-size: 0.46em;
  margin: 0.3em 0;
}

.reveal .slides section table.compact.hexlegend td,
.reveal .slides section table.compact.hexlegend th {
  padding: 0.22em 0.6em;
}

.reveal .slides section table.compact.hexlegend td:first-child {
  width: 1%;
  white-space: nowrap;
}

/* byte-field tables: the same column positions on every slide, so stepping
   from one dump to the next doesn't shift the columns */
.reveal .slides section table.hexlegend:is(.fields, .fields2) {
  table-layout: fixed;
  width: 100%;
}

.reveal .slides section table.hexlegend:is(.fields, .fields2) :is(th, td) {
  box-sizing: border-box;
}

.reveal .slides section table.hexlegend:is(.fields, .fields2) th:nth-child(1) { width: 3%; }
.reveal .slides section table.hexlegend:is(.fields, .fields2) th:nth-child(2) { width: 8%; }
.reveal .slides section table.hexlegend.fields th:nth-child(3) { width: 30%; }
.reveal .slides section table.hexlegend.fields2 th:nth-child(3) { width: 22%; }

.reveal .slides section table.hexlegend:is(.fields, .fields2) td:nth-child(2) {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.reveal .hexlabel {
  margin: 0.3em 0 0.2em;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.42em;
  color: var(--muted);
}

.reveal .hexlabel strong {
  color: var(--ink);
}

.reveal .hexkey {
  margin: 0.2em 0 0;
  font-size: 0.46em;
  color: var(--ink);
}

.reveal .hexkey .chip {
  margin-left: 0.8em;
}

.reveal .hexkey .chip:first-child {
  margin-left: 0;
}

.reveal .hexnote {
  font-size: 0.6em;
  margin-top: 0.4em;
}

/* —— rabbit-hole pointer strip —— */
.reveal .rabbit {
  margin-top: 0.9em;
  padding: 0.5em 0.8em;
  border: 1px dashed var(--warn);
  border-radius: 6px;
  font-size: 0.6em;
  line-height: 1.5;
  color: var(--ink);
}

.reveal .rabbit span {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85em;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--warn);
  margin-right: 0.7em;
}

/* —— origin story —— */
.reveal .story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4em;
  font-size: 0.78em;
  line-height: 1.4;
}

.reveal .story-beat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 0.8em 1em;
}

.reveal .story-beat p {
  margin: 0 0 0.5em;
}

.reveal .story-where {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7em;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

/* —— progressive layer board —— */
.reveal .layer-board {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  max-width: 32em;
  margin: 0;
  font-size: 0.72em;
}

.reveal .layer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1em;
  padding: 0.55em 0.85em;
  border-radius: 0.35em;
  border: 1px solid var(--line);
  background: var(--empty);
  transition: background 0.4s ease, border-color 0.4s ease;
}

.reveal .layer .lbl {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85em;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: left;
}

.reveal .layer .lbl em {
  font-style: normal;
  opacity: 0.7;
  font-size: 0.85em;
}

.reveal .layer .val {
  font-family: Fraunces, Georgia, serif;
  font-size: 1.05em;
  color: var(--muted);
  text-align: right;
}

/* two protocols side by side on the same layer below */
.reveal .layer-row {
  display: flex;
  gap: 0.3em;
}

.reveal .layer-row > .layer[data-id="ctl"] {
  flex: 0 0 34%;
}

.reveal .layer-row > .layer[data-id="trn"] {
  flex: 1;
}

.reveal .layer.filled {
  background: var(--filled);
  border-color: var(--accent-dim);
}

.reveal .layer.filled .lbl {
  color: var(--accent);
}

.reveal .layer.filled .val {
  color: var(--ink);
}

.reveal .layer.optional:not(.filled) {
  border-style: dashed;
  opacity: 0.75;
}

.reveal .stages {
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.1em;
  color: var(--accent);
  letter-spacing: 0.04em;
}

/* —— layout: content slides anchored top-left, dividers centered —— */
.reveal .slides section {
  box-sizing: border-box;
  height: 100%;
  padding: 56px 72px 40px;
  text-align: left;
}

.reveal .slides section.divider {
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.reveal .slides section.divider .subtitle {
  margin-left: auto;
  margin-right: auto;
}

.reveal .slides section:not(.divider) h2 {
  font-size: 1.35em;
  margin: 0 0 0.7em;
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--line);
}

.reveal .slides section:not(.divider) ul,
.reveal .slides section:not(.divider) ol,
.reveal .slides section:not(.divider) blockquote,
.reveal .slides section:not(.divider) .black-box,
.reveal .slides section:not(.divider) table.compact {
  margin-left: 0;
  margin-right: 0;
}

/* speaker notes hint */
.reveal .slide-number {
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  color: var(--muted);
  background: transparent;
}

.reveal .mermaid {
  display: flex;
  justify-content: center;
  background: transparent;
}

.reveal .mermaid svg {
  max-width: 100%;
  height: auto;
  /* mermaid draws the lifelines far past the diagram and clips them itself */
  overflow: hidden;
}

.reveal .mermaid.spread svg {
  width: 840px;
}

.reveal .mermaid.journey svg {
  width: 1180px;
}

.reveal .mermaid.tcp-life svg {
  max-height: 480px;
  width: auto;
}

.reveal .mermaid.wire-life svg {
  max-height: 480px;
  width: auto;
}

.reveal .mermaid.tls-life svg {
  max-height: 470px;
  width: auto;
}

/* stepped diagrams: solid message lines draw from sender to receiver,
   and the arrowhead lands once the line gets there */
.reveal .slides section .mermaid .fragment {
  transition: opacity 0.35s ease;
}

.reveal .slides section .mermaid line.fragment.draw {
  opacity: 1;
  visibility: inherit;
  /* mermaid's own id-scoped rule sets none on message lines */
  stroke-dasharray: 1 !important;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 0.45s ease-out;
}

.reveal .slides section .mermaid line.fragment.draw.visible {
  stroke-dashoffset: 0;
}

.reveal .slides section .mermaid polygon.head.fragment.visible {
  transition-delay: 0.35s;
}

.reveal .step-controls {
  display: flex;
  justify-content: center;
  gap: 0.35em;
  margin: 0.2em 0 0.4em;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.4em;
}

.reveal .step-controls button {
  font: inherit;
  min-width: 2.2em;
  padding: 0.25em 0.6em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}

.reveal .step-controls button:hover {
  color: var(--ink);
  border-color: var(--accent);
}

.reveal .step-controls button:first-child {
  color: var(--accent);
  border-color: var(--accent);
  margin-right: 0.2em;
}

.reveal .step-controls button.done {
  color: var(--ink);
  border-color: var(--accent);
}

.reveal .step-controls button.now {
  color: #0c1218;
  background: var(--accent);
}

/* three dumps on one slide (the TCP handshake) */
.reveal pre.hexdump.stack3 {
  padding: 0.35em 1em;
  margin-bottom: 0.1em;
}

.reveal pre.hexdump.stack3 + .hexlabel {
  margin-top: 0.15em;
}

/* code slides that carry a struct plus its methods */
.reveal .slides section.code-tight pre {
  font-size: 0.52em;
  margin-bottom: 0.4em;
}

/* the row a comparison table is building up to */
.reveal table tr.em-row td {
  color: var(--accent);
  font-weight: 600;
  border-top: 2px solid var(--accent);
}