/* ========================================
   YogeshWebDev — Reading Theme + 3-col Layout
   ======================================== */

@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  color-scheme: light;

  /* Warm, eye-friendly palette (reduces blue light) */
  --page:        #f6f1e7;
  --side:        #f1ebdd;
  --surface:     #fbf8f1;
  --surface-soft:#eee8da;
  --ink:         #2f2f2b;
  --ink-soft:    #5a5a52;
  --ink-faint:   #8a8a80;
  --mark:        #4f6f58;   /* deep sage green */
  --mark-soft:   #e3ebdd;
  --rule:        #e2dbc9;
  --hover:       #ece6d7;
  --shadow:      0 1px 2px rgba(60,55,40,0.04), 0 4px 12px rgba(60,55,40,0.04);

  /* Layout */
  --leftbar-w:  16rem;
  --rightbar-w: 14rem;
  --content-w:  46rem;      /* ~720px @ 16px */
  --gap:        2rem;

  /* Type */
  --font-text: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-ui:   "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;

  --reading-size: 18px;
  --reading-line: 1.75;

  /* Radius */
  --r-sm: 5px;
  --r-md: 8px;
  --r-lg: 12px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;      /* fixed navbar offset */
  background: var(--page);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;

  background: var(--page);
  color: var(--ink);

  font-family: var(--font-text);
  font-size: var(--reading-size);
  line-height: var(--reading-line);

  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Auto padding — only when sidebars exist & visible */
body:has(#navbar nav)   { padding-left:  var(--leftbar-w); }
body:has(#rightbar:not([hidden])) { padding-right: var(--rightbar-w); }

/* ---------- Content column ---------- */
main {
  width: 100%;
  max-width: var(--content-w);
  min-height: 100vh;
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

main > h1 {
  margin: 0 0 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);

  font-family: var(--font-text);
  font-size: clamp(1.85rem, 1.4rem + 1.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  text-wrap: balance;                 /* modern browsers */
  overflow-wrap: anywhere;
}

/* Chapter label above each h2 */
main section {
  margin: 0 0 3rem;
  counter-increment: chapter;
  scroll-margin-top: 5rem;
}

main { counter-reset: chapter; }

main section > h2 {
  position: relative;
  margin: 0 0 1.25rem;
  padding-top: 0.5rem;

  font-family: var(--font-text);
  font-size: clamp(1.3rem, 1.1rem + 0.6vw, 1.6rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

main section > h2::before {
  content: "Chapter " counter(chapter);
  display: block;
  margin-bottom: 0.4rem;

  color: var(--mark);
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

main h3 {
  margin: 1.75rem 0 0.6rem;
  font-size: 1.2rem;
  line-height: 1.4;
}

main p {
  margin: 0.75rem 0 1.15rem;
  color: var(--ink-soft);
}

main strong { color: var(--ink); font-weight: 600; }

main a {
  color: var(--mark);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
main a:hover { text-decoration-thickness: 2px; }

/* ---------- Details (accordions) ---------- */
main details {
  margin: 0.6rem 0;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  transition: border-color 0.15s, box-shadow 0.15s;
}

main details:hover { border-color: #d4ccb6; }
main details[open] {
  border-color: var(--mark);
  box-shadow: var(--shadow);
}

main summary {
  position: relative;
  padding: 0.85rem 1.1rem 0.85rem 2.6rem;
  list-style: none;
  cursor: pointer;
  border-radius: var(--r-md);
  user-select: none;

  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 0.94rem;
  font-weight: 500;
  line-height: 1.55;
  transition: background 0.15s, color 0.15s;
}

main summary::-webkit-details-marker { display: none; }

main summary::before {
  content: "";
  position: absolute;
  left: 1.15rem;
  top: 50%;
  width: 0.35rem;
  height: 0.35rem;
  border-right: 2px solid var(--ink-faint);
  border-bottom: 2px solid var(--ink-faint);
  transform: translateY(-70%) rotate(-45deg);
  transition: transform 0.2s, border-color 0.2s;
}

main summary:hover { background: var(--hover); }

main details[open] > summary {
  color: var(--mark);
  font-weight: 600;
  background: var(--mark-soft);
  border-radius: var(--r-md) var(--r-md) 0 0;
}

main details[open] > summary::before {
  transform: translateY(-40%) rotate(45deg);
  border-color: var(--mark);
}

main details > *:not(summary) {
  padding: 0 1.1rem 1.1rem 2.6rem;
  margin: 0;
}

main details > *:not(summary):first-of-type { padding-top: 0.5rem; }

/* ---------- Code ---------- */
pre {
  max-width: 100%;
  margin: 1.3rem 0;
  padding: 1.15rem 1.3rem;
  overflow-x: auto;

  background: var(--surface-soft);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: var(--r-md);

  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  tab-size: 2;
}

code { font-family: var(--font-mono); font-size: 0.88em; }

:not(pre) > code {
  padding: 0.12em 0.4em;
  background: var(--surface-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow-wrap: anywhere;
}

/* ---------- Lists ---------- */
main ul, main ol {
  padding-left: 1.5rem;
  color: var(--ink-soft);
}
main li { margin: 0.4rem 0; padding-left: 0.15rem; }
main li::marker { color: var(--mark); }

/* ---------- Tables ---------- */
main table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: 0.9rem;
}
main th, main td {
  padding: 0.75rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
}
main th {
  background: var(--surface-soft);
  color: var(--ink);
  font-weight: 600;
}

/* ---------- Media ---------- */
main img, main video, main iframe {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
}

/* ---------- Focus / selection ---------- */
::selection { background: var(--mark-soft); color: var(--ink); }
:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 3px;
  border-radius: 3px;
}


/* ---------- Responsive ---------- */
@media (max-width: 1150px) {
  body:has(#rightbar:not([hidden])) { padding-right: 0; }
  #rightbar { display: none; }
}

@media (max-width: 860px) {
  body:has(#navbar nav) { padding-left: 0; }
  main { padding: 2rem 1.25rem 4rem; }
  main > h1 { margin-top: 1rem; }
}

@media (max-width: 520px) {
  :root { --reading-size: 16.5px; --reading-line: 1.7; }
  main { padding: 1.5rem 1rem 3rem; }
  main section { margin-bottom: 2.25rem; }
  main summary { padding: 0.75rem 0.9rem 0.75rem 2.3rem; font-size: 0.92rem; }
  main summary::before { left: 0.95rem; }
  main details > *:not(summary) { padding: 0 0.9rem 0.9rem 2.3rem; }
  pre { padding: 0.9rem; font-size: 0.78rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media print {
  body { padding: 0 !important; background: #fff; color: #000; }
  main { max-width: none; padding: 0; }
  main details { break-inside: avoid; }
  main details > *:not(summary) { display: block !important; }
  #navbar, #rightbar { display: none !important; }
}