/* ==========================================================================
   Fisiología Respiratoria — Estilo editorial tipo Claude
   Fuentes libres autohospedadas · Modo claro/oscuro · Print-ready
   ========================================================================== */

/* --- @font-face (ruta relativa: ../fonts/ desde assets/css/) ------------- */

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/source-serif-4-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Source Serif 4';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/source-serif-4-latin-400-italic.woff2') format('woff2');
}
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/source-serif-4-latin-600-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/source-serif-4-latin-700-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Hanken Grotesk';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/hanken-grotesk-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Hanken Grotesk';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/hanken-grotesk-latin-500-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Hanken Grotesk';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/hanken-grotesk-latin-600-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Hanken Grotesk';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/hanken-grotesk-latin-700-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-latin-500-normal.woff2') format('woff2');
}

/* --- Design tokens (CSS custom properties) ------------------------------- */

:root {
  /* Typography stacks — easy to swap with licensed fonts */
  --font-body:    'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-heading: 'Hanken Grotesk', -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', Consolas, 'Courier New', monospace;

  /* Modular scale (minor third ×1.2) */
  --fs-sm:   0.833rem;
  --fs-base: 1rem;
  --fs-md:   1.125rem;
  --fs-lg:   1.35rem;
  --fs-xl:   1.62rem;
  --fs-2xl:  1.944rem;
  --fs-3xl:  2.333rem;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2.5rem;
  --space-2xl: 4rem;

  /* Layout */
  --content-width: 740px;
  --content-measure: 70ch;

  /* Light palette (Claude warm) */
  --c-bg:            #FAF9F5;
  --c-bg-secondary:  #F3F1EB;
  --c-surface:       #EDEAE3;
  --c-text:          #1A1A18;
  --c-text-secondary:#6B6B65;
  --c-accent:        #D97757;
  --c-accent-hover:  #C4653A;
  --c-accent-light:  rgba(217, 119, 87, 0.10);
  --c-border:        #DDD9D0;
  --c-border-light:  #E8E5DD;
  --c-link:          #C4653A;
  --c-link-hover:    #A84E2A;
  --c-code-bg:       #F0EDE6;
  --c-code-border:   #E0DCD4;
  --c-bq-bg:         #F5F3ED;
  --c-bq-border:     #D97757;
  --c-table-head:    #EDEAE3;
  --c-table-stripe:  #F7F5F0;
  --c-hr:            #D5D2CA;
  --c-shadow:        rgba(0,0,0,0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg:            #1F1E1C;
    --c-bg-secondary:  #272624;
    --c-surface:       #2E2D2A;
    --c-text:          #E8E6DF;
    --c-text-secondary:#A5A29A;
    --c-accent:        #E8946A;
    --c-accent-hover:  #F0B090;
    --c-accent-light:  rgba(232, 148, 106, 0.12);
    --c-border:        #3A3835;
    --c-border-light:  #333230;
    --c-link:          #E8946A;
    --c-link-hover:    #F0B090;
    --c-code-bg:       #292826;
    --c-code-border:   #3A3835;
    --c-bq-bg:         #262523;
    --c-bq-border:     #D97757;
    --c-table-head:    #2E2D2A;
    --c-table-stripe:  #242320;
    --c-hr:            #3A3835;
    --c-shadow:        rgba(0,0,0,0.25);
  }
}

/* --- Base reset ---------------------------------------------------------- */

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.72;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* --- Layout -------------------------------------------------------------- */

.content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

article {
  max-width: var(--content-measure);
}

/* --- Navigation ---------------------------------------------------------- */

.site-nav {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg) 0;
}

.nav-home {
  font-family: var(--font-heading);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--c-text-secondary);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.15s ease;
}
.nav-home:hover { color: var(--c-accent); }

/* --- Footer -------------------------------------------------------------- */

.site-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--c-border-light);
}
.site-footer p {
  font-family: var(--font-heading);
  font-size: var(--fs-sm);
  color: var(--c-text-secondary);
}

/* --- Typography ---------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-text);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-3xl); margin: 0 0 var(--space-lg); }
h2 { font-size: var(--fs-2xl); margin: var(--space-2xl) 0 var(--space-md); padding-top: var(--space-md); }
h3 { font-size: var(--fs-xl);  margin: var(--space-xl) 0 var(--space-sm); }
h4 { font-size: var(--fs-lg);  margin: var(--space-lg) 0 var(--space-sm); }
h5 { font-size: var(--fs-md);  margin: var(--space-lg) 0 var(--space-xs); }
h6 { font-size: var(--fs-base); margin: var(--space-md) 0 var(--space-xs); text-transform: uppercase; letter-spacing: 0.04em; }

article > h2:first-child { margin-top: 0; }

p  { margin: 0 0 var(--space-md); }
p:last-child { margin-bottom: 0; }

strong { font-weight: 700; }
em     { font-style: italic; }

a {
  color: var(--c-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  transition: color 0.15s ease;
}
a:hover { color: var(--c-link-hover); }

small { font-size: var(--fs-sm); }

sup, sub { font-size: 0.75em; }

/* Anchor links on headings */
.anchor-link {
  font-family: var(--font-heading);
  font-weight: 400;
  color: var(--c-accent);
  opacity: 0;
  margin-right: 0.35em;
  font-size: 0.8em;
  transition: opacity 0.15s ease;
  text-decoration: none;
}
h1:hover .anchor-link,
h2:hover .anchor-link,
h3:hover .anchor-link,
h4:hover .anchor-link,
h5:hover .anchor-link,
h6:hover .anchor-link { opacity: 1; }

h1 > a, h2 > a, h3 > a, h4 > a, h5 > a, h6 > a {
  color: inherit;
  text-decoration: none;
}

/* --- Lists --------------------------------------------------------------- */

ul, ol {
  margin: 0 0 var(--space-md);
  padding-left: 1.5em;
}
li { margin-bottom: 0.3em; }
li > ul, li > ol { margin-top: 0.3em; margin-bottom: 0; }
li > p { margin-bottom: 0.3em; }

/* --- Horizontal rule ----------------------------------------------------- */

hr {
  border: none;
  height: 1px;
  background: var(--c-hr);
  margin: var(--space-xl) 0;
}

/* --- Images -------------------------------------------------------------- */

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--space-lg) 0;
  border-radius: 6px;
  border: 1px solid var(--c-border-light);
}

/* --- Blockquotes / callouts ---------------------------------------------- */

blockquote {
  margin: var(--space-md) 0 var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--c-bq-bg);
  border-left: 3px solid var(--c-bq-border);
  border-radius: 0 6px 6px 0;
  color: var(--c-text);
  font-size: 0.95em;
}
blockquote p:last-child { margin-bottom: 0; }

blockquote blockquote {
  margin: var(--space-sm) 0;
  background: var(--c-accent-light);
  border-left-color: var(--c-accent-hover);
}

blockquote h3 {
  font-size: var(--fs-md);
  margin-top: 0;
  margin-bottom: var(--space-sm);
  color: var(--c-accent);
}

/* --- Tables -------------------------------------------------------------- */

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--space-md) 0 var(--space-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92em;
  line-height: 1.55;
  margin: var(--space-md) 0 var(--space-lg);
}

thead th {
  font-family: var(--font-heading);
  font-weight: 600;
  text-align: left;
  background: var(--c-table-head);
  padding: 0.65em 0.9em;
  border-bottom: 2px solid var(--c-border);
  white-space: nowrap;
}

tbody td {
  padding: 0.55em 0.9em;
  border-bottom: 1px solid var(--c-border-light);
  vertical-align: top;
}

tbody tr:nth-child(even) { background: var(--c-table-stripe); }
tbody tr:hover           { background: var(--c-accent-light); }

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

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--c-code-bg);
  border: 1px solid var(--c-code-border);
  padding: 0.12em 0.35em;
  border-radius: 4px;
  word-break: break-word;
}

/* --- Code blocks (highlight.js) ------------------------------------------ */

pre.hljs {
  margin: var(--space-md) 0 var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--c-code-bg);
  border: 1px solid var(--c-code-border);
  border-radius: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  line-height: 1.55;
  font-size: 0.88em;
}
pre.hljs code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  word-break: normal;
}

/* highlight.js token colors — warm palette */
.hljs-keyword,
.hljs-selector-tag,
.hljs-built_in     { color: #D97757; }
.hljs-string,
.hljs-addition     { color: #6A8759; }
.hljs-number,
.hljs-literal      { color: #6897BB; }
.hljs-comment,
.hljs-quote        { color: #888; font-style: italic; }
.hljs-attr,
.hljs-attribute    { color: #B07D48; }
.hljs-type,
.hljs-title,
.hljs-section      { color: #C4653A; font-weight: 600; }
.hljs-name         { color: #D97757; }
.hljs-symbol,
.hljs-bullet       { color: #CC7832; }
.hljs-meta         { color: #888; }
.hljs-deletion     { color: #D44; }
.hljs-emphasis     { font-style: italic; }
.hljs-strong       { font-weight: bold; }

@media (prefers-color-scheme: dark) {
  .hljs-keyword,
  .hljs-selector-tag,
  .hljs-built_in     { color: #E8946A; }
  .hljs-string,
  .hljs-addition     { color: #A5C261; }
  .hljs-number,
  .hljs-literal      { color: #7EB8DA; }
  .hljs-comment,
  .hljs-quote        { color: #777; }
  .hljs-attr,
  .hljs-attribute    { color: #D4A76A; }
  .hljs-type,
  .hljs-title,
  .hljs-section      { color: #E8946A; }
  .hljs-name         { color: #E8946A; }
}

/* --- KaTeX adjustments --------------------------------------------------- */

.katex-display {
  margin: var(--space-lg) 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-sm) 0;
}

.katex {
  font-size: 1.1em;
}

.katex-display > .katex {
  font-size: 1.15em;
}

/* --- Index page ---------------------------------------------------------- */

.index-page { padding-top: var(--space-2xl); }

.index-header {
  margin-bottom: var(--space-xl);
}
.index-header h1 {
  font-size: var(--fs-3xl);
  margin-bottom: var(--space-xs);
}
.index-header .subtitle {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  color: var(--c-text-secondary);
  font-weight: 400;
}

.index-nav ul {
  list-style: none;
  padding: 0;
}
.index-nav li {
  margin-bottom: 0;
}
.index-nav a {
  display: block;
  padding: var(--space-md) var(--space-lg);
  border-radius: 8px;
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--c-text);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
  border: 1px solid transparent;
}
.index-nav a:hover {
  background: var(--c-accent-light);
  border-color: var(--c-border-light);
  color: var(--c-accent);
}

/* --- Index folder dropdowns ---------------------------------------------- */

.index-folder {
  margin-top: var(--space-md);
  border: 1px solid var(--c-border-light);
  border-radius: 8px;
  overflow: hidden;
}

.index-folder summary {
  display: block;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--c-text);
  cursor: pointer;
  background: var(--c-bg-secondary);
  transition: background 0.15s ease, color 0.15s ease;
  list-style: none;
}
.index-folder summary::-webkit-details-marker { display: none; }
.index-folder summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 0.5em;
  transition: transform 0.2s ease;
  color: var(--c-accent);
}
.index-folder[open] summary::before {
  transform: rotate(90deg);
}
.index-folder summary:hover {
  background: var(--c-accent-light);
  color: var(--c-accent);
}

.index-folder ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.index-folder li {
  margin-bottom: 0;
}
.index-folder a {
  display: block;
  padding: var(--space-sm) var(--space-lg) var(--space-sm) calc(var(--space-lg) + 1.2em);
  font-family: var(--font-heading);
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--c-text);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
  border-top: 1px solid var(--c-border-light);
}
.index-folder a:hover {
  background: var(--c-accent-light);
  color: var(--c-accent);
}

/* --- Responsive ---------------------------------------------------------- */

@media (max-width: 768px) {
  :root {
    --fs-3xl: 1.8rem;
    --fs-2xl: 1.5rem;
    --fs-xl:  1.25rem;
  }

  .content {
    padding: var(--space-lg) var(--space-md);
  }

  .site-nav {
    padding: var(--space-sm) var(--space-md) 0;
  }

  .site-footer {
    padding: var(--space-lg) var(--space-md) var(--space-md);
  }

  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
  }
  thead th { white-space: nowrap; }

  blockquote {
    padding: var(--space-sm) var(--space-md);
    margin-left: 0;
    margin-right: 0;
  }

  pre.hljs {
    padding: var(--space-sm) var(--space-md);
    border-radius: 4px;
  }

  .katex-display {
    font-size: 0.9em;
  }
}

@media (max-width: 480px) {
  :root {
    --fs-3xl: 1.55rem;
    --fs-2xl: 1.3rem;
    --fs-xl:  1.15rem;
  }

  .content {
    padding: var(--space-md) var(--space-sm);
  }

  .index-nav a {
    padding: var(--space-sm) var(--space-md);
  }
}

/* --- Print --------------------------------------------------------------- */

@media print {
  :root {
    --c-bg: #fff;
    --c-text: #000;
    --c-text-secondary: #444;
    --c-border: #ccc;
    --c-border-light: #ddd;
    --c-code-bg: #f5f5f5;
    --c-code-border: #ddd;
    --c-bq-bg: #fafafa;
    --c-bq-border: #999;
    --c-table-head: #eee;
    --c-table-stripe: #f9f9f9;
    --c-hr: #ccc;
    --c-accent: #333;
    --c-link: #000;
  }

  body {
    font-size: 11pt;
    line-height: 1.6;
  }

  .site-nav,
  .site-footer,
  .anchor-link { display: none !important; }

  .content {
    max-width: 100%;
    padding: 0;
    margin: 0;
  }

  article { max-width: 100%; }

  a { color: #000; text-decoration: underline; }
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  h1, h2, h3, h4 { page-break-after: avoid; }

  table, pre, blockquote, img { page-break-inside: avoid; }

  table { white-space: normal; }

  img {
    max-width: 80%;
    margin: 0.8em auto;
    border: none;
  }

  pre.hljs {
    border: 1px solid #ddd;
    white-space: pre-wrap;
    word-wrap: break-word;
  }

  .katex-display { overflow: visible; }
}