:root {
  --green:      #35C982;  /* HacKSU green  */
  --dim-green:  #4dcb90;  /* dimmed green  */
  --amber:      #4683FF;  /* HacKSU blue   */
  --red:        #ff4444;
  --bg:         #142027;
  --bg2:        #0d1a22;
  --border:     #1a2a3f;  /* blue-tinted border */
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 20px; }

body {
  background: var(--bg);
  color: var(--green);
  font-family: 'Courier New', Courier, monospace;
  height: 100vh;
  overflow: hidden;
  user-select: none;
}

/* CRT scanlines */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(0,0,0,0.04) 2px,
    rgba(0,0,0,0.04) 4px
  );
  pointer-events: none;
  z-index: 1000;
}

/* ── Slides ─────────────────────────────────────────────── */
#deck { width: 100vw; height: 100vh; position: relative; }

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 16px 48px 62px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  background: rgba(20, 32, 39, 0.55);
}
.slide.active { opacity: 1; pointer-events: all; }

/* ── Slide header bar ───────────────────────────────────── */
.slide-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 12px;
  font-size: 17px;
  color: var(--dim-green);
  letter-spacing: 1px;
}
.slide-header .tag { color: var(--amber); letter-spacing: 3px; text-transform: uppercase; }
.slide-header img { height: 38px !important; }

/* ── Slide body ─────────────────────────────────────────── */
.slide-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 10px;
  overflow: hidden;
  min-height: 0;
}

h1 {
  font-size: 3.2em;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--green);
  text-shadow: 0 0 24px rgba(53,201,130,0.4);
  line-height: 1.1;
}
h2 {
  font-size: 1.5em;
  letter-spacing: 2px;
  color: var(--amber);
  text-transform: uppercase;
  flex-shrink: 0;
}
h3 { font-size: 0.95em; color: var(--amber); letter-spacing: 1px; text-transform: uppercase; }

p, li { font-size: 0.95em; line-height: 1.7; color: #e8e8e8; }
ul { list-style: none; padding-left: 0; }
ul li::before { content: '> '; color: var(--green); }

.subtitle  { font-size: 1.1em; color: #a0e8c8; letter-spacing: 2px; }
.hl-green  { color: var(--green);  font-weight: bold; }
.hl-amber  { color: var(--amber); }
.hl-red    { color: var(--red); }
.hl-dim    { color: #8899aa; }

/* ── Layout helpers ─────────────────────────────────────── */
.two-col   { display: grid; grid-template-columns: 1fr 1fr;     gap: 14px; flex: 1; min-height: 0; }
.three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; flex: 1; min-height: 0; }

.box {
  border: 1px solid var(--border);
  padding: 12px 14px;
  background: rgba(13, 26, 34, 0.85);
  backdrop-filter: blur(2px);
  overflow: auto;
}
.box h3 {
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.box ul li { font-size: 0.85em; }
.box p     { font-size: 0.85em; color: #cdd; }

.pill {
  display: inline-block;
  border: 1px solid var(--green);
  padding: 1px 8px;
  font-size: 0.75em;
  color: var(--green);
  margin: 2px;
}
.pill.amber { border-color: var(--amber); color: var(--amber); }

/* ── Code blocks ────────────────────────────────────────── */
pre {
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: auto;
  flex: 1;
  min-height: 0;
  max-height: 100%;
  font-size: 0.8em;
}
pre code.hljs {
  padding: 16px 20px;
  background: #080d12;
  font-family: 'Courier New', Courier, monospace;
}

/* ── ASCII / diagram boxes ──────────────────────────────── */
.ascii {
  font-size: 0.78em;
  color: var(--dim-green);
  line-height: 1.5;
  padding: 14px 16px;
  border: 1px solid var(--border);
  background: rgba(5, 10, 14, 0.85);
  white-space: pre;
}

/* ── Side-by-side parser view ───────────────────────────── */
.parser-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  font-size: 0.78em;
}
.pv-header {
  padding: 7px 14px;
  font-weight: bold;
  letter-spacing: 2px;
  font-size: 0.9em;
}
.pv-c   { background: #0d0505; }
.pv-py  { background: #050d05; border-left: 1px solid var(--border); }
.pv-c  .pv-header { background: #1a0808; color: #ff8888; border-bottom: 1px solid var(--border); }
.pv-py .pv-header { background: #081a08; color: #88ff88; border-bottom: 1px solid var(--border); }
.pv-body { padding: 12px 14px; }
.pv-body .line {
  padding: 1px 0;
  white-space: pre;
  font-family: 'Courier New', Courier, monospace;
}
.pv-body .line.skip    { color: #2a2a2a; }
.pv-body .line.active  { color: #ffffff; }
.pv-body .line.comment { color: #7a9e8a; font-style: italic; }
.pv-body .line.exec    { color: var(--amber); font-weight: bold; }
.pv-body .line.str     { color: #4ec9b0; }

/* ── Terminal prompt lines ──────────────────────────────── */
.prompt-line { font-size: 0.9em; margin: 2px 0; }
.prompt-line .prompt { color: var(--green); }
.prompt-line .cmd    { color: #fff; }

/* ── Info bar ───────────────────────────────────────────── */
.info-bar {
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: rgba(5,5,5,0.8);
  font-size: 0.83em;
  color: #cdd;
  flex-shrink: 0;
}

/* ── Blink cursor ───────────────────────────────────────── */
.cursor::after {
  content: '█';
  animation: blink 1s step-end infinite;
  color: var(--green);
}
@keyframes blink { 50% { opacity: 0; } }

/* ── Navigation footer ──────────────────────────────────── */
#nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 10px;
  border-top: 1px solid var(--border);
  background: var(--bg);
  z-index: 100;
}
#nav button {
  background: none;
  border: 1px solid var(--dim-green);
  color: var(--dim-green);
  padding: 3px 14px;
  font-family: inherit;
  font-size: 0.82em;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 1px;
}
#nav button:hover:not(:disabled) {
  border-color: var(--green);
  color: var(--green);
  text-shadow: 0 0 6px var(--green);
}
#nav button:disabled { opacity: 0.25; cursor: default; }

#progress-dots { display: flex; gap: 6px; align-items: center; }
.dot {
  width: 6px; height: 6px;
  border: 1px solid var(--dim-green);
  border-radius: 50%;
  transition: background 0.2s;
  cursor: pointer;
}
.dot.active { background: var(--green); box-shadow: 0 0 5px var(--green); }
#slide-counter { font-size: 0.78em; color: var(--dim-green); min-width: 48px; text-align: center; }
#key-hint { font-size: 0.72em; color: #333; }

/* Networking content uses the template's colors, type, and layouts. */
html { font-size: clamp(18px, 1.8vw, 28px); }
.slide-body { justify-content: center; gap: 22px; }
.slide-body h2 { margin-bottom: 8px; }
.two-col, .three-col { flex: initial; }
.box { min-width: 0; padding: 24px; }
.box p { font-size: 1em; }
.box p + p { margin-top: 16px; }
.box code { font-size: 0.9em; }
.box h3 { font-size: 1.05em; }
.slide-header .timing { color: #b6c8d2; font-size: 0.85em; letter-spacing: 0; }
.info-bar { font-size: 0.9em; line-height: 1.6; }
.network-path { display: flex; align-items: center; justify-content: center; gap: 16px; margin: 20px 0; }
.network-node { border: 1px solid var(--green); padding: 24px 18px; text-align: center; color: #e8e8e8; line-height: 1.6; }
.network-node code { font-size: 0.85em; }
.path-arrow { color: var(--amber); font-size: 1.6em; }
table { width: 100%; border-collapse: collapse; color: #e8e8e8; font-size: 0.95em; }
th, td { text-align: left; padding: 14px 16px; border-bottom: 1px solid #38505c; }
th { color: var(--green); }
.layer-table { font-size: 0.85em; }
.layer-table td { padding: 11px 16px; }
.encapsulation { border: 2px solid var(--green); padding: 22px; font-size: 1.2em; }
.encapsulation div { border: 1px solid var(--amber); margin-top: 18px; padding: 22px; color: #e8e8e8; }
pre { flex: initial; padding: 22px; background: #080d12; color: #e8e8e8; line-height: 1.7; font-size: 1em; }
.box pre { padding: 14px; font-size: 0.9em; }
code { overflow-wrap: anywhere; }
pre code { white-space: pre-wrap; }
.steps { padding-left: 32px; }
.steps li { margin-bottom: 18px; }
a { color: #a0e8c8; text-underline-offset: 4px; }
.sources { columns: 2; column-gap: 40px; }
.sources li { break-inside: avoid; margin-bottom: 14px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); }
#nav #progress-dots button { width: 8px; height: 8px; padding: 0; flex-shrink: 0; }
#key-hint { color: #b6c8d2; }
#notes-link { font-size: 0.75em; }
:focus-visible { outline: 2px solid #fff; outline-offset: 4px; }

@media (max-width: 1000px) {
  html { font-size: 18px; }
  #key-hint { display: none; }
  .network-path { gap: 8px; }
  .network-node { padding: 18px 10px; }
}
@media (max-width: 650px) {
  html { font-size: 16px; }
  .slide { padding: 12px 18px 100px; overflow-y: auto; }
  .slide-body { flex: initial; overflow: visible; gap: 20px; }
  .slide-header { gap: 12px; align-items: flex-start; }
  .slide-header .tag { font-size: 0.7em; letter-spacing: 1px; }
  .slide-header .timing { font-size: 0.65em; }
  .slide-header img { height: 28px !important; }
  h1 { font-size: 2.4em; }
  h2 { font-size: 1.3em; }
  .two-col, .three-col { grid-template-columns: 1fr; }
  .network-path { flex-direction: column; margin: 0; }
  .network-node { width: 100%; padding: 12px; }
  .path-arrow { transform: rotate(90deg); line-height: 1; }
  .encapsulation, .encapsulation div { padding: 12px; }
  table { font-size: 0.8em; }
  th, td, .layer-table td { padding: 8px 5px; }
  .layer-table { font-size: 0.72em; }
  .sources { columns: 1; }
  #nav { flex-wrap: wrap; gap: 12px; }
  #progress-dots { order: 5; width: 100%; justify-content: center; flex-wrap: wrap; gap: 5px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}