/* ── Texty-themed portfolio ── */

:root {
  /* Texty warm palette */
  --bg:      #FAFAF8;
  --fg:      #1C1917;
  --muted:   #78716C;
  --border:  #D6D3D1;
  --surface: #F5F4F2;

  /* Legacy aliases kept for compatibility */
  --text-color:            var(--fg);
  --text-color-alt:        var(--muted);
  --background-color:      var(--bg);
  --background-color-alt:  var(--surface);

  /* Fonts */
  --font-serif:  "Instrument Serif", Georgia, serif;
  --font-sans:   "DM Sans", sans-serif;
  --font-mono:   "DM Mono", "JetBrains Mono", monospace;
  --font-family: var(--font-mono);

  /* Layout */
  --line-height:       1.25rem;
  --border-thickness:  1px;

  /* Weights */
  --font-weight-normal:  400;
  --font-weight-medium:  500;
  --font-weight-bold:    600;

  font-family: var(--font-family);
  font-optical-sizing: auto;
  font-weight: var(--font-weight-normal);
  font-style: normal;
  font-variant-numeric: tabular-nums lining-nums;
  font-size: 15px;
}

/* Light theme (default = texty warm) */
:root[data-theme="light"] {
  --fg:      #1C1917;
  --muted:   #78716C;
  --bg:      #FAFAF8;
  --surface: #F5F4F2;
  --border:  #D6D3D1;
  --text-color:           var(--fg);
  --text-color-alt:       var(--muted);
  --background-color:     var(--bg);
  --background-color-alt: var(--surface);
}

/* Dark theme: invert warmly */
:root[data-theme="dark"] {
  --fg:      #F5F4F2;
  --muted:   #A8A29E;
  --bg:      #1C1917;
  --surface: #28211E;
  --border:  #3D3733;
  --text-color:           var(--fg);
  --text-color-alt:       var(--muted);
  --background-color:     var(--bg);
  --background-color-alt: var(--surface);
}

* {
  box-sizing: border-box;
}

* + * {
  margin-top: var(--line-height);
}

/* ── Dot grid background ── */
html {
  display: flex;
  width: 100%;
  margin: 0;
  padding: 0;
  flex-direction: column;
  align-items: center;
  background-color: var(--bg);
  color: var(--fg);
  background-image: radial-gradient(circle, color-mix(in srgb, var(--fg) 12%, transparent) 1px, transparent 1px);
  background-size: 24px 24px;
  background-attachment: fixed;
  transition: background-color 0.3s, color 0.3s;
}

body {
  position: relative;
  width: 100%;
  margin: 0;
  padding: var(--line-height) 3rem;
  max-width: calc(min(80ch, round(down, 100%, 1ch)));
  line-height: var(--line-height);
  overflow-x: hidden;
  /* Fade out the dot grid behind the content column */
  background: radial-gradient(ellipse 100% 100% at 50% 0%, var(--bg) 60%, transparent 100%),
              var(--bg);
  background-color: var(--bg);
  transition: background-color 0.3s, color 0.3s;
}

/* ── Utilities ── */
.text-left    { width: 100%; text-align: left; }
.text-center  { text-align: center; }
.margin-0     { margin: 0; }
.container    { display: flex; justify-content: center; }
.text-v-center {
  display: flex;
  gap: 4px;
  align-items: center;
  justify-content: start;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  margin: calc(var(--line-height) * 2) 0 var(--line-height);
  line-height: var(--line-height);
}

/* Name — large serif italic, like texty's brand */
h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  font-size: 2.4rem;
  line-height: calc(2 * var(--line-height));
  margin-bottom: calc(var(--line-height) * 2);
  text-transform: none;
  letter-spacing: -0.01em;
}

/* Section headings — small-caps sans with left accent */
h2 {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  padding-left: 0.75rem;
  border-left: 2px solid var(--border);
  margin-top: calc(var(--line-height) * 2.5);
}

h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

p {
  margin-bottom: var(--line-height);
  word-break: break-word;
  word-wrap: break-word;
  hyphens: auto;
  line-height: 1.65;
}

strong { font-weight: var(--font-weight-bold); }
em     { font-style: italic; }

a {
  text-decoration-thickness: var(--border-thickness);
  text-underline-offset: 3px;
}
a:link, a:visited {
  color: var(--fg);
}
a:hover {
  color: var(--muted);
  text-decoration-color: var(--muted);
}

/* Inline content links (not nav/buttons) get a warm underline */
p a, li a, .now-card a {
  text-decoration-color: var(--border);
}
p a:hover, li a:hover, .now-card a:hover {
  text-decoration-color: var(--muted);
}

sub {
  position: relative;
  display: inline-block;
  margin: 0;
  vertical-align: sub;
  line-height: 0;
  width: calc(1ch / 0.75);
  font-size: .75rem;
}

/* ── Horizontal rule ── */
hr {
  position: relative;
  display: block;
  height: var(--line-height);
  margin: calc(var(--line-height) * 1.5) 0;
  border: none;
  color: var(--border);
}
hr:after {
  display: block;
  content: "";
  position: absolute;
  top: calc(var(--line-height) / 2 - var(--border-thickness));
  left: 0;
  width: 100%;
  border-top: 1px solid var(--border);
  height: 0;
}

/* ── Table ── */
table {
  position: relative;
  top: calc(var(--line-height) / 2);
  width: calc(round(down, 100%, 1ch));
  border-collapse: collapse;
  margin: 0 0 calc(var(--line-height) * 2);
}

th, td {
  border: var(--border-thickness) solid var(--border);
  padding:
    calc((var(--line-height) / 2))
    calc(1ch - var(--border-thickness) / 2)
    calc((var(--line-height) / 2) - var(--border-thickness));
  line-height: var(--line-height);
  vertical-align: top;
  text-align: left;
}
table tbody tr:first-child > * {
  padding-top: calc((var(--line-height) / 2) - var(--border-thickness));
}
th { font-weight: 700; }

.width-min { width: 0%; }
.width-auto { width: 100%; text-align: left; }

/* ── Header ── */
.header {
  margin-bottom: calc(var(--line-height) * 2);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  border: var(--border-thickness) solid var(--border) !important;
  border-radius: 12px;
}
.header h1 {
  margin: 0;
}
.header tr td:last-child {
  text-align: right;
}

/* ── Header nav ── */
.nav-split {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 1ch;
}
.nav-left, .nav-right {
  display: flex;
  gap: 1ch;
  margin: 0;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.8rem;
}
.nav-left *, .nav-right * {
  margin-top: 0;
}

/* ── Details / project cards ── */
details {
  border: var(--border-thickness) solid var(--border);
  border-radius: 10px;
  padding: calc(var(--line-height) - var(--border-thickness)) 1ch;
  margin-bottom: var(--line-height);
  background: var(--surface);
  transition: box-shadow 0.2s;
}
details:hover {
  box-shadow: 0 2px 12px color-mix(in srgb, var(--fg) 6%, transparent);
}

summary {
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  font-family: var(--font-mono);
}
details[open] summary {
  margin-bottom: var(--line-height);
}
summary::marker {
  display: inline-block;
  content: '▶';
  margin: 0;
}
details[open] > summary::marker {
  content: '▼';
}
details :last-child {
  margin-bottom: 0;
}

/* ── TOC nav ── */
#TOC {
  background: var(--surface);
  border: var(--border-thickness) solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem 0.9rem;
  margin-bottom: var(--line-height);
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  margin-top: 0;
}
.toc-label {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.toc-external {
  display: flex;
  gap: 0.75rem;
}
.toc-ext-link {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}
.toc-ext-link:hover { color: var(--fg); }

.toc-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: var(--border-thickness) solid var(--border);
  padding-top: 0.65rem;
}
.toc-list li { margin: 0; }
.toc-list a {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--muted);
  text-decoration: none;
  display: block;
  padding: 0.2rem 0;
  transition: color 0.15s;
}
.toc-list a:hover { color: var(--fg); }
.toc-list a.toc-active {
  color: var(--fg);
  font-weight: 600;
}

/* ── TOC active link ── */
#TOC a.toc-active {
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
}

/* ── Code / pre ── */
pre {
  white-space: pre;
  overflow-x: auto;
  margin: var(--line-height) 0;
  overflow-y: hidden;
}
figure pre { margin: 0; }
pre, code {
  font-family: var(--font-mono);
}
code {
  font-weight: var(--font-weight-medium);
}

/* ── Figure ── */
figure {
  margin: calc(var(--line-height) * 2) 3ch;
  overflow-x: auto;
  overflow-y: hidden;
}
figcaption {
  display: block;
  font-style: italic;
  margin-top: var(--line-height);
  color: var(--muted);
  font-size: 0.85rem;
}

/* ── Lists ── */
ul, ol {
  padding: 0;
  margin: 0 0 var(--line-height);
}
ul {
  list-style-type: square;
  padding: 0 0 0 2ch;
}
ol {
  list-style-type: none;
  counter-reset: item;
  padding: 0;
}
ol ul, ol ol, ul ol, ul ul {
  padding: 0 0 0 3ch;
  margin: 0;
}
ol li:before {
  content: counters(item, ".") ". ";
  counter-increment: item;
  font-weight: var(--font-weight-medium);
}
li {
  margin: 0;
  padding: 0;
}
li::marker {
  line-height: 0;
}

/* ── Images / video ── */
img, video {
  display: block;
  width: 100%;
  object-fit: contain;
  overflow: hidden;
}
img {
  font-style: italic;
  color: var(--muted);
  border-radius: 8px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 4px; height: var(--line-height); }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── Inputs / buttons ── */
input, button, textarea {
  border: var(--border-thickness) solid var(--border);
  border-radius: 6px;
  padding:
    calc(var(--line-height) / 2 - var(--border-thickness))
    calc(1ch - var(--border-thickness));
  margin: 0;
  font: inherit;
  font-weight: inherit;
  height: calc(var(--line-height) * 2);
  width: auto;
  overflow: visible;
  background: var(--bg);
  color: var(--fg);
  line-height: normal;
  -webkit-font-smoothing: inherit;
  -moz-osx-font-smoothing: inherit;
  -webkit-appearance: none;
}
input[type=checkbox] {
  display: inline-grid;
  place-content: center;
  vertical-align: top;
  width: 2ch;
  height: var(--line-height);
  cursor: pointer;
}
input[type=checkbox]:checked:before {
  content: "";
  width: 1ch;
  height: calc(var(--line-height) / 2);
  background: var(--fg);
}
button:focus, input:focus {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}
input {
  width: calc(round(down, 100%, 1ch));
}
::placeholder       { color: var(--muted); opacity: 1; }
::-ms-input-placeholder { color: var(--muted); }
button::-moz-focus-inner { padding: 0; border: 0; }

button {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
}
button:hover   { background: var(--surface); }
button:active  { transform: translate(1px, 1px); }

label {
  display: block;
  width: calc(round(down, 100%, 1ch));
  height: auto;
  line-height: var(--line-height);
  font-weight: var(--font-weight-medium);
  margin: 0;
}
label input { width: 100%; }

/* ── Tree ── */
.tree, .tree ul {
  position: relative;
  padding-left: 0;
  list-style-type: none;
  line-height: var(--line-height);
}
.tree ul { margin: 0; }
.tree ul li {
  position: relative;
  padding-left: 1.5ch;
  margin-left: 1.5ch;
  border-left: var(--border-thickness) solid var(--border);
}
.tree ul li:before {
  position: absolute;
  display: block;
  top: calc(var(--line-height) / 2);
  left: 0;
  content: "";
  width: 1ch;
  border-bottom: var(--border-thickness) solid var(--border);
}
.tree ul li:last-child { border-left: none; }
.tree ul li:last-child:after {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  content: "";
  height: calc(var(--line-height) / 2);
  border-left: var(--border-thickness) solid var(--border);
}

/* ── Grid ── */
.grid {
  --grid-cells: 0;
  display: flex;
  gap: 1ch;
  width: calc(round(down, 100%, (1ch * var(--grid-cells)) - (1ch * var(--grid-cells) - 1)));
  margin-bottom: var(--line-height);
}
.grid > *, .grid > input {
  flex: 0 0 calc(round(down, (100% - (1ch * (var(--grid-cells) - 1))) / var(--grid-cells), 1ch));
}
.grid:has(> :last-child:nth-child(1)) { --grid-cells: 1; }
.grid:has(> :last-child:nth-child(2)) { --grid-cells: 2; }
.grid:has(> :last-child:nth-child(3)) { --grid-cells: 3; }
.grid:has(> :last-child:nth-child(4)) { --grid-cells: 4; }
.grid:has(> :last-child:nth-child(5)) { --grid-cells: 5; }
.grid:has(> :last-child:nth-child(6)) { --grid-cells: 6; }
.grid:has(> :last-child:nth-child(7)) { --grid-cells: 7; }
.grid:has(> :last-child:nth-child(8)) { --grid-cells: 8; }
.grid:has(> :last-child:nth-child(9)) { --grid-cells: 9; }

/* ── Scroll progress bar ── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--fg);
  z-index: 200;
  transition: width 0.1s linear;
  margin: 0;
}

/* ── Sidebar TOC (desktop only) ── */
#toc-sidebar {
  display: none;
}

@media (min-width: 1280px) {
  #TOC { display: none; }

  #toc-sidebar {
    display: block;
    position: fixed;
    top: 3.5rem;
    left: calc(50vw - 380px - 210px);
    width: 180px;
  }
}

.toc-sidebar-label {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 0.7rem;
  line-height: 1;
}
.toc-sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0 0 0.8rem;
  border-left: 1px solid var(--border);
}
.toc-sidebar-list li { margin: 0; }
.toc-sidebar-list a {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--muted);
  text-decoration: none;
  display: block;
  padding: 0.22rem 0 0.22rem 0.8rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  line-height: 1.35;
  transition: color 0.15s, border-color 0.15s;
}
.toc-sidebar-list a:hover { color: var(--fg); }
.toc-sidebar-list a.toc-active {
  color: var(--fg);
  font-weight: 500;
  border-left-color: var(--fg);
}
.toc-sidebar-ext {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  border-top: 1px solid var(--border);
  padding-top: 0.65rem;
}
.toc-sidebar-ext a {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--muted);
  text-decoration: none;
  padding-left: 0.8rem;
  transition: color 0.15s;
  margin: 0;
}
.toc-sidebar-ext a:hover { color: var(--fg); }

/* ── Back to top + Theme toggle: side by side in bottom-right ── */
.back-to-top,
.theme-toggle-fixed {
  position: fixed;
  bottom: 1.25rem;
  z-index: 100;
  padding: 6px 14px;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  background: var(--bg);
  border: var(--border-thickness) solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: var(--font-weight-medium);
  color: var(--fg);
  min-width: 3.5rem;
  text-align: center;
  transition: opacity 0.2s, background 0.2s, box-shadow 0.2s;
}
.back-to-top:hover,
.theme-toggle-fixed:hover {
  background: var(--surface);
  box-shadow: 0 2px 8px color-mix(in srgb, var(--fg) 8%, transparent);
}

/* theme toggle anchored to the right, fixed width so calc is exact */
.theme-toggle-fixed {
  right: 1.25rem;
  width: 5rem;
}

/* back-to-top sits to its left with a 0.5rem gap */
.back-to-top {
  right: calc(1.25rem + 5rem + 0.5rem);
  width: 4rem;
  opacity: 0;
  pointer-events: none;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ── Typewriter cursor ── */
#cursor {
  animation: blink 1s step-end infinite;
  font-weight: var(--font-weight-normal);
  color: var(--muted);
}
@keyframes blink {
  50% { opacity: 0; }
}

/* ── Status line ── */
.status-line {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: calc(var(--line-height) / 2);
  margin-bottom: 0;
  font-family: var(--font-mono);
}

/* ── Subtitle ── */
.subtitle {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.01em;
}

/* ── Video embed ── */
.video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  margin: var(--line-height) 0;
  border: var(--border-thickness) solid var(--border);
  border-radius: 10px;
}
.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
}

/* ── Footer ── */
.site-footer {
  display: flex;
  justify-content: center;
  gap: 2ch;
  padding: var(--line-height) 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.8rem;
}
.site-footer * { margin-top: 0; }

/* ── Blog post preview ── */
.post-preview {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border: var(--border-thickness) solid var(--border);
  border-radius: 8px;
  margin: calc(var(--line-height) / 2) 0;
}
.post-date {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0;
}

/* ── Diagram boxes ── */
pre .diagram-box { margin-top: 0; }
.diagram-box {
  cursor: pointer;
  transition: text-shadow 0.2s;
}
.diagram-box:hover {
  text-shadow: 0 0 8px color-mix(in srgb, var(--fg) 60%, transparent);
}

/* ── Diagram visibility ── */
.diagram-mobile  { display: none; }
.diagram-desktop { display: block; }

/* ── Now card ── */
.now-card {
  background: var(--surface);
  border: var(--border-thickness) solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.25rem 0.5rem;
  margin-bottom: var(--line-height);
}
.now-card .now-updated {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0;
  margin-bottom: 0.6rem;
}
.now-card ul {
  margin-bottom: 0.75rem;
}
.now-card li {
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ── Skill pills ── */
.skill-groups {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: var(--line-height);
}
.skill-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin: 0;
}
.skill-label {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  min-width: 5.5rem;
  padding-top: 0.25rem;
  flex-shrink: 0;
}
.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
}
.pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fg);
  background: var(--surface);
  border: var(--border-thickness) solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  line-height: 1.6;
  white-space: nowrap;
  margin: 0;
}


/* ── What I Do cards ── */
.wid-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: 0;
  margin: var(--line-height) 0;
}

.wid-card {
  background: var(--surface);
  border: var(--border-thickness) solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1rem;
  cursor: pointer;
  transition: box-shadow 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}
.wid-card:hover {
  border-color: color-mix(in srgb, var(--fg) 25%, transparent);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--fg) 7%, transparent);
}

.wid-step {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.5rem;
  margin-top: 0;
}

.wid-title {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: 1.45rem;
  line-height: 1.15;
  color: var(--fg);
  margin: 0 0 0.85rem;
}

.wid-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.wid-list li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  line-height: 1.6;
  padding-left: 0.9ch;
  position: relative;
  margin: 0;
}
.wid-list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--border);
}

.wid-arrow {
  font-size: 1rem;
  color: var(--border);
  padding: 0 0.6rem;
  margin: 0;
  user-select: none;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.wid-footer {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
  border-top: var(--border-thickness) solid var(--border);
  padding-top: var(--line-height);
  margin-top: 0;
  margin-bottom: var(--line-height);
}


/* ── Terminal button ── */
.terminal-btn {
  padding: 2px 8px;
  font-size: 0.75rem;
  height: auto;
  line-height: 1.4;
  margin: 0;
  font-family: var(--font-mono);
}

/* ── Terminal overlay ── */
.terminal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  place-items: center;
  background: color-mix(in srgb, var(--fg) 40%, transparent);
  backdrop-filter: blur(4px);
  margin: 0;
}
.terminal-overlay.active { display: grid; }

.terminal-window {
  width: 90vw;
  max-width: 80ch;
  height: 70vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: var(--border-thickness) solid var(--border);
  border-radius: 12px;
  margin: 0;
  overflow: hidden;
  box-shadow: 0 24px 64px color-mix(in srgb, var(--fg) 18%, transparent);
}
.terminal-window * { margin-top: 0; }

.terminal-titlebar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 1ch;
  border-bottom: var(--border-thickness) solid var(--border);
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  font-family: var(--font-sans);
  color: var(--muted);
  background: var(--surface);
}

.terminal-close {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0 4px;
  height: auto;
  text-transform: lowercase;
  color: var(--muted);
  border-radius: 4px;
}
.terminal-close:hover { background: var(--border); }

.terminal-output {
  flex: 1;
  overflow-y: auto;
  padding: 1ch;
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 0;
  font-family: var(--font-mono);
}

.terminal-input-line {
  display: flex;
  align-items: center;
  border-top: var(--border-thickness) solid var(--border);
  padding: 4px 1ch;
  background: var(--surface);
}

.terminal-prompt {
  font-size: 0.8rem;
  font-weight: var(--font-weight-medium);
  white-space: pre;
  color: var(--muted);
  font-family: var(--font-mono);
}

.terminal-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 0.8rem;
  padding: 0;
  height: auto;
  outline: none;
  color: var(--fg);
  font-family: var(--font-mono);
}
.terminal-input:focus {
  outline: none;
}

/* ── Diagram highlight on scroll target ── */
@keyframes diagram-highlight {
  0%   { border-color: var(--fg); }
  25%  { border-color: var(--muted); }
  50%  { border-color: var(--fg); }
  75%  { border-color: var(--muted); }
  100% { border-color: var(--fg); }
}
.diagram-target-highlight {
  animation: diagram-highlight 1s ease;
}

/* ── Debug utilities ── */
.debug .debug-grid {
  --color: color-mix(in srgb, var(--fg) 8%, var(--bg) 92%);
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(var(--color) 0 1px, transparent 1px 100%),
    repeating-linear-gradient(90deg, var(--color) 0 1px, transparent 1px 100%);
  background-size: 1ch var(--line-height);
  margin: 0;
}
.debug .off-grid { background: rgba(255, 0, 0, 0.1); }
.debug-toggle-label { text-align: right; }

/* ── Body scroll lock when terminal open ── */
body.terminal-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

/* ══ RESPONSIVE ══ */

/* ── Tablet ── */
@media screen and (max-width: 768px) {
  :root { font-size: 14px; }
  .diagram-desktop { font-size: 0.75rem; }
}

/* ── Mobile ── */
@media screen and (max-width: 480px) {
  :root { font-size: 13px; }

  body { padding: var(--line-height) 1.25rem; }

  .toc-external { display: none; }

  .wid-grid {
    grid-template-columns: 1fr;
  }
  .wid-arrow {
    text-align: center;
    padding: 0.1rem 0;
    font-size: 1.1rem;
    transform: rotate(90deg);
    display: block;
  }

  .header {
    display: block;
    width: 100%;
    border-radius: 8px;
    top: 0;
    padding: var(--line-height) 1ch;
    margin-bottom: var(--line-height);
  }
  .header tbody, .header tr, .header td, .header th {
    display: block;
    width: 100%;
    border: none;
    padding: 0;
    margin: 0;
  }
  .header tbody tr:first-child > * { padding-top: 0; }
  .header tr td:last-child { text-align: left !important; }
  .header-nav {
    display: flex !important;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: var(--line-height);
    padding-top: var(--line-height) !important;
    border-top: var(--border-thickness) solid var(--border) !important;
  }
  .header-nav .header-links { width: 100%; flex: 1 1 100%; }
  .nav-split { flex-wrap: wrap; }
  .nav-right  { flex-wrap: wrap; }

  .subtitle {
    font-size: 0.8rem;
    line-height: 1.4;
  }
  .status-line { font-size: 0.7rem; }

  .diagram-desktop { display: none; }
  .diagram-mobile  { display: block; }

  details {
    padding: calc(var(--line-height) - var(--border-thickness)) 0.5ch;
    border-radius: 8px;
  }
  details summary { font-size: 0.85rem; line-height: 1.4; }

  ul { padding-left: 1.5ch; }
  ul ul, ol ul { padding-left: 2ch; }

  h1 {
    font-size: 1.9rem;
    line-height: calc(1.5 * var(--line-height));
    margin-bottom: var(--line-height);
  }

  #skills ~ p, #skills + p { font-size: 0.85rem; }

  .terminal-overlay.active {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 2vh;
  }
  .terminal-window {
    width: 100vw;
    max-width: 100vw;
    max-height: 96vh;
    border-left: none;
    border-right: none;
    border-radius: 0 0 12px 12px;
  }
  .terminal-output {
    min-height: 100px;
    max-height: none;
    flex: 1;
    font-size: 0.7rem;
  }
  .terminal-input, .terminal-prompt {
    font-size: 16px; /* prevents iOS zoom on focus */
  }
}