/* Minimal, readable, light (parchment) / dark. */

@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+Telugu:wght@500;600&display=swap");

:root {
  /* Light: warm parchment. */
  --bg: #f7f0e1;
  --fg: #2a251e;
  --muted: #776b5a;
  --rule: #e3d8c1;
  --accent: #8a3b12;
  --code-bg: #eee4cf;
  --measure: 40rem;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Charter,
    "Bitstream Charter", "Source Serif Pro", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --telugu: "Noto Serif Telugu", serif;
  --mono: "JetBrains Mono", "Iosevka", "Fira Code", ui-monospace, SFMono-Regular,
    Menlo, Consolas, monospace;
  color-scheme: light dark;
}

:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
}

/* Dark: follows the system unless the toggle forced light; or forced dark. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161616;
    --fg: #e4e1dc;
    --muted: #9a958e;
    --rule: #2c2b29;
    --accent: #e3a27a;
    --code-bg: #1f1e1d;
  }
}
:root[data-theme="dark"] {
  --bg: #161616;
  --fg: #e4e1dc;
  --muted: #9a958e;
  --rule: #2c2b29;
  --accent: #e3a27a;
  --code-bg: #1f1e1d;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 112.5%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
  max-width: var(--measure);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--serif);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

/* ---- header / footer ---------------------------------------------------- */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  margin-bottom: 3rem;
}

.site-name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.15rem 0.6rem;
  color: var(--fg);
  text-decoration: none;
}

.name-te {
  font-family: var(--telugu);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.3;
}

.name-en {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  font-family: var(--sans);
  font-size: 0.85rem;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.mode-toggle {
  display: inline-flex;
  align-self: center;
  padding: 0;
  color: var(--muted);
  background: none;
  border: 0;
  cursor: pointer;
}

.mode-toggle[hidden] {
  display: none;
}

.mode-toggle svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Show the moon in light mode (click for dark), the sun in dark mode. */
.icon-sun {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-moon {
    display: none;
  }
  :root:not([data-theme="light"]) .icon-sun {
    display: block;
  }
}

:root[data-theme="dark"] .icon-moon {
  display: none;
}

:root[data-theme="dark"] .icon-sun {
  display: block;
}

.mode-toggle:hover {
  color: var(--accent);
}

.site-header nav a:hover {
  color: var(--accent);
}

.site-footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-footer a {
  color: inherit;
}

/* ---- typography ---------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  font-weight: 600;
  margin: 2.2em 0 0.6em;
}

h1 {
  font-size: 1.7rem;
  margin-top: 0;
}
h2 {
  font-size: 1.3rem;
}
h3 {
  font-size: 1.1rem;
}

p,
ul,
ol,
blockquote,
pre,
table,
figure {
  margin: 0 0 1.2em;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
  color: var(--muted);
  font-style: italic;
}

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

figure {
  text-align: center;
}

figcaption {
  font-size: 0.85rem;
  color: var(--muted);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
}

th,
td {
  border-bottom: 1px solid var(--rule);
  padding: 0.35rem 0.6rem;
  text-align: left;
}

/* ---- code ---------------------------------------------------------------- */

code,
pre {
  font-family: var(--mono);
  font-size: 0.82em;
}

:not(pre) > code {
  background: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 0.9rem 1rem;
  border-radius: 4px;
  overflow-x: auto;
  line-height: 1.5;
}

/* Copy button (added by site.js). */
.code-block {
  position: relative;
}

.code-block .copy {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  padding: 0.1rem 0.45rem;
  font: 0.7rem var(--sans);
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}

.code-block:hover .copy,
.code-block .copy:focus-visible {
  opacity: 1;
}

@media (hover: none) {
  .code-block .copy {
    opacity: 1;
  }
}

/* D2 diagrams, inlined as SVG at build time. */
.diagram {
  margin: 0 0 1.2em;
  text-align: center;
}

.diagram svg {
  max-width: 100%;
  height: auto;
}

/* D2 paints a solid background rect; let the page background show through.
   !important because D2's own (dark-mode) rules are more specific. */
.diagram svg.d2-svg > rect:first-child {
  fill: transparent !important;
}

/* Display math can overflow on phones. */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
}

/* ---- posts --------------------------------------------------------------- */

.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  margin-bottom: 0.3rem;
}

.post-meta {
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tag {
  margin-right: 0.4rem;
}

.toc {
  font-family: var(--sans);
  font-size: 0.85rem;
  margin-bottom: 2rem;
  color: var(--muted);
}

.toc summary {
  cursor: pointer;
}

.toc ol,
.toc ul {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  display: flex;
  gap: 1.25rem;
  padding: 0.3rem 0;
}

.post-list time {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  padding-top: 0.2rem;
}

.more {
  font-family: var(--sans);
  font-size: 0.85rem;
}

/* Footnotes. cmarkit emits <section role="doc-endnotes"> with a ↩︎ backlink
   after each note's paragraph; keep the backlink on the same line. */
section[role="doc-endnotes"] {
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding-top: 1rem;
}

section[role="doc-endnotes"] li > p {
  display: inline;
}

section[role="doc-endnotes"] a[role="doc-backlink"] {
  margin-left: 0.3rem;
  text-decoration: none;
}

a.fn-label {
  text-decoration: none;
}

@media (max-width: 30rem) {
  html {
    font-size: 106%;
  }
  .post-list li {
    flex-direction: column;
    gap: 0;
  }
}