/* The Headless Studio — clean, modern, reads like documentation you'd trust. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --text: #1a2027;
  --text-soft: #5b6470;
  --accent: #5b5bd6;
  --accent-soft: #eceafd;
  --border: #e4e7eb;
  --code-bg: #272822; /* matches the monokai blocks */
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101318;
    --bg-soft: #171b22;
    --text: #e7eaee;
    --text-soft: #9aa4b1;
    --accent: #8b8bf5;
    --accent-soft: #23233f;
    --border: #262c35;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 1.05rem;
  -webkit-font-smoothing: antialiased;
}

main, .site-header, .site-footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Links — accent everywhere by default; no browser blue/purple.
   Component links (nav, cards, lists) override with their own colors. */
a { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); text-underline-offset: 2px; }
a:hover { text-decoration-color: var(--accent); }
/* No a:visited override — it would out-specify component colors like .btn
   (turning a clicked button's text purple-on-purple). Author `a{color}`
   already prevents the browser's default visited-purple on prose links. */

/* Header */
.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.site-title {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-title .cursor {
  color: var(--accent);
  animation: blink 1.2s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.site-header nav a {
  color: var(--text-soft);
  text-decoration: none;
  margin-left: 1.25rem;
  font-size: 0.95rem;
}

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

/* Hero */
.hero { padding: 2.5rem 0 1.5rem; }

.hero h1 {
  font-size: 2.1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

.hero p { color: var(--text-soft); font-size: 1.1rem; max-width: 38rem; }

/* Article cards */
.article-list { padding-bottom: 3rem; }

.card {
  display: block;
  padding: 1.25rem 1.4rem;
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  background: var(--bg-soft);
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover { border-color: var(--accent); transform: translateY(-1px); }

.card h2 { margin: 0 0 0.35rem; font-size: 1.25rem; letter-spacing: -0.01em; }
.card p { margin: 0.25rem 0; color: var(--text-soft); font-size: 0.98rem; }

.meta { color: var(--text-soft); font-size: 0.88rem; }

/* Article body */
article { padding: 2rem 0 1rem; }

.article-header h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

article h2 { font-size: 1.45rem; margin-top: 2.25rem; letter-spacing: -0.01em; }
article h3 { font-size: 1.15rem; margin-top: 1.75rem; }

article a { color: var(--accent); }

article img {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}

article blockquote {
  margin: 1.25rem 0;
  padding: 0.1rem 1.25rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 0 8px 8px 0;
  color: var(--text-soft);
}

article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  display: block;
  overflow-x: auto;
}

article th, article td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

article th { color: var(--text-soft); font-weight: 600; }

/* Code */
code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
}

p code, li code, h2 code, h3 code {
  background: var(--accent-soft);
  padding: 0.12em 0.35em;
  border-radius: 5px;
}

.highlight {
  background: var(--code-bg);
  border-radius: 10px;
  margin: 1.25rem 0;
  overflow-x: auto;
}

.highlight pre {
  margin: 0;
  padding: 1rem 1.2rem;
  line-height: 1.55;
  font-size: 0.86rem;
}

/* CTA box */
.cta {
  margin: 3rem 0;
  padding: 1.5rem 1.6rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-soft);
}

.cta h3 { margin: 0 0 0.5rem; }
.cta p { color: var(--text-soft); font-size: 0.97rem; }

.subscribe { display: flex; gap: 0.6rem; margin: 1rem 0; flex-wrap: wrap; }

.subscribe input {
  flex: 1;
  min-width: 14rem;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

.subscribe button {
  padding: 0.6rem 1.3rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}

.subscribe button:hover { filter: brightness(1.1); }

.cta-small { font-size: 0.9rem !important; margin: 0.4rem 0; }

/* Footer */
.site-footer {
  padding-top: 1rem;
  padding-bottom: 2.5rem;
  color: var(--text-soft);
  font-size: 0.88rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
  .hero h1 { font-size: 1.6rem; }
  .article-header h1 { font-size: 1.55rem; }
  .site-header { flex-direction: column; gap: 0.5rem; }
  .site-header nav a { margin-left: 0; margin-right: 1.25rem; }
  .book-actions { flex-direction: column; }
}

/* Footer links */
.footer-links { margin-top: 0.4rem; }
.footer-links a { color: var(--text-soft); }
.footer-links a:hover { color: var(--accent); }

/* Book landing page */
.book-hero { padding: 2.5rem 0 1.5rem; border-bottom: 1px solid var(--border); }
.book-hero::after { content: ""; display: block; clear: both; }   /* contain the float */
.book-cover-shot {
  float: left; width: 200px; margin: 0.3rem 1.75rem 1rem 0;
  border-radius: 8px; border: 1px solid var(--border);
  box-shadow: 0 12px 30px rgba(0,0,0,0.35);
}
.book-dl-note { color: var(--text-soft); font-size: 0.9rem; margin-top: 0.75rem; }
@media (max-width: 560px) {
  .book-cover-shot { float: none; display: block; width: 170px; margin: 0 auto 1.25rem; }
  .book-hero { text-align: center; }
  .book-actions { justify-content: center; }
}
.book-hero h1 { font-size: 2.3rem; letter-spacing: -0.02em; margin: 0 0 0.25rem; }
.book-sub {
  color: var(--accent);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1rem; margin: 0 0 1rem;
}
.book-actions { display: flex; gap: 0.75rem; margin-top: 1.5rem; }
.btn {
  display: inline-block; padding: 0.6rem 1.3rem; border-radius: 8px;
  background: var(--accent); color: #fff; text-decoration: none;
  font-weight: 600; font-size: 0.95rem;
}
.btn:hover { filter: brightness(1.1); }
.btn-ghost {
  background: transparent; color: var(--accent);
  border: 1px solid var(--accent);
}

.book-toc { padding: 2rem 0; }
.book-toc h2 { font-size: 1.2rem; margin: 1.75rem 0 0.75rem; }
.book-list { padding-left: 1.5rem; margin: 0; }
.book-list li { margin: 0.55rem 0; }
.book-list li::marker { color: var(--text-soft); }
.book-list a {
  color: var(--accent);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.12s;
}
.book-list a:hover { text-decoration-color: var(--accent); }

/* Book chapter pages */
.book-chapter { padding: 2rem 0 1rem; }
.book-chapter h1 { font-size: 2rem; letter-spacing: -0.02em; line-height: 1.2; }
.book-full hr { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }

.book-nav {
  display: flex; justify-content: space-between; align-items: center;
  gap: 1rem; padding: 1.5rem 0; margin-top: 1rem;
  border-top: 1px solid var(--border);
}
.book-nav a { color: var(--accent); text-decoration: none; font-size: 0.95rem; }
.book-nav a:hover { text-decoration: underline; }

.book-foot {
  margin: 2.5rem 0; padding: 1.4rem 1.5rem;
  border: 1px solid var(--border); border-radius: 14px;
  background: var(--bg-soft);
}
.book-foot p { color: var(--text-soft); font-size: 0.95rem; margin: 0 0 0.8rem; }

pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #49483e }
.highlight { background: #272822; color: #F8F8F2 }
.highlight .c { color: #959077 } /* Comment */
.highlight .err { color: #ED007E; background-color: #1E0010 } /* Error */
.highlight .esc { color: #F8F8F2 } /* Escape */
.highlight .g { color: #F8F8F2 } /* Generic */
.highlight .k { color: #66D9EF } /* Keyword */
.highlight .l { color: #AE81FF } /* Literal */
.highlight .n { color: #F8F8F2 } /* Name */
.highlight .o { color: #FF4689 } /* Operator */
.highlight .x { color: #F8F8F2 } /* Other */
.highlight .p { color: #F8F8F2 } /* Punctuation */
.highlight .ch { color: #959077 } /* Comment.Hashbang */
.highlight .cm { color: #959077 } /* Comment.Multiline */
.highlight .cp { color: #959077 } /* Comment.Preproc */
.highlight .cpf { color: #959077 } /* Comment.PreprocFile */
.highlight .c1 { color: #959077 } /* Comment.Single */
.highlight .cs { color: #959077 } /* Comment.Special */
.highlight .gd { color: #FF4689 } /* Generic.Deleted */
.highlight .ge { color: #F8F8F2; font-style: italic } /* Generic.Emph */
.highlight .ges { color: #F8F8F2; font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #F8F8F2 } /* Generic.Error */
.highlight .gh { color: #F8F8F2 } /* Generic.Heading */
.highlight .gi { color: #A6E22E } /* Generic.Inserted */
.highlight .go { color: #66D9EF } /* Generic.Output */
.highlight .gp { color: #FF4689; font-weight: bold } /* Generic.Prompt */
.highlight .gs { color: #F8F8F2; font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #959077 } /* Generic.Subheading */
.highlight .gt { color: #F8F8F2 } /* Generic.Traceback */
.highlight .kc { color: #66D9EF } /* Keyword.Constant */
.highlight .kd { color: #66D9EF } /* Keyword.Declaration */
.highlight .kn { color: #FF4689 } /* Keyword.Namespace */
.highlight .kp { color: #66D9EF } /* Keyword.Pseudo */
.highlight .kr { color: #66D9EF } /* Keyword.Reserved */
.highlight .kt { color: #66D9EF } /* Keyword.Type */
.highlight .ld { color: #E6DB74 } /* Literal.Date */
.highlight .m { color: #AE81FF } /* Literal.Number */
.highlight .s { color: #E6DB74 } /* Literal.String */
.highlight .na { color: #A6E22E } /* Name.Attribute */
.highlight .nb { color: #F8F8F2 } /* Name.Builtin */
.highlight .nc { color: #A6E22E } /* Name.Class */
.highlight .no { color: #66D9EF } /* Name.Constant */
.highlight .nd { color: #A6E22E } /* Name.Decorator */
.highlight .ni { color: #F8F8F2 } /* Name.Entity */
.highlight .ne { color: #A6E22E } /* Name.Exception */
.highlight .nf { color: #A6E22E } /* Name.Function */
.highlight .nl { color: #F8F8F2 } /* Name.Label */
.highlight .nn { color: #F8F8F2 } /* Name.Namespace */
.highlight .nx { color: #A6E22E } /* Name.Other */
.highlight .py { color: #F8F8F2 } /* Name.Property */
.highlight .nt { color: #FF4689 } /* Name.Tag */
.highlight .nv { color: #F8F8F2 } /* Name.Variable */
.highlight .ow { color: #FF4689 } /* Operator.Word */
.highlight .pm { color: #F8F8F2 } /* Punctuation.Marker */
.highlight .w { color: #F8F8F2 } /* Text.Whitespace */
.highlight .mb { color: #AE81FF } /* Literal.Number.Bin */
.highlight .mf { color: #AE81FF } /* Literal.Number.Float */
.highlight .mh { color: #AE81FF } /* Literal.Number.Hex */
.highlight .mi { color: #AE81FF } /* Literal.Number.Integer */
.highlight .mo { color: #AE81FF } /* Literal.Number.Oct */
.highlight .sa { color: #E6DB74 } /* Literal.String.Affix */
.highlight .sb { color: #E6DB74 } /* Literal.String.Backtick */
.highlight .sc { color: #E6DB74 } /* Literal.String.Char */
.highlight .dl { color: #E6DB74 } /* Literal.String.Delimiter */
.highlight .sd { color: #E6DB74 } /* Literal.String.Doc */
.highlight .s2 { color: #E6DB74 } /* Literal.String.Double */
.highlight .se { color: #AE81FF } /* Literal.String.Escape */
.highlight .sh { color: #E6DB74 } /* Literal.String.Heredoc */
.highlight .si { color: #E6DB74 } /* Literal.String.Interpol */
.highlight .sx { color: #E6DB74 } /* Literal.String.Other */
.highlight .sr { color: #E6DB74 } /* Literal.String.Regex */
.highlight .s1 { color: #E6DB74 } /* Literal.String.Single */
.highlight .ss { color: #E6DB74 } /* Literal.String.Symbol */
.highlight .bp { color: #F8F8F2 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #A6E22E } /* Name.Function.Magic */
.highlight .vc { color: #F8F8F2 } /* Name.Variable.Class */
.highlight .vg { color: #F8F8F2 } /* Name.Variable.Global */
.highlight .vi { color: #F8F8F2 } /* Name.Variable.Instance */
.highlight .vm { color: #F8F8F2 } /* Name.Variable.Magic */
.highlight .il { color: #AE81FF } /* Literal.Number.Integer.Long */
/* Book EPUB email capture */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.book-signup {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.4rem 1.6rem; margin: 1.75rem 0 0;
}
.book-signup strong { display: block; font-size: 1.05rem; }
.book-signup > p {
  color: var(--text-soft); font-size: 0.92rem;
  margin: 0.4rem 0 1rem; max-width: 62ch;
}
.signup-form { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.signup-form input[type="email"] {
  flex: 1 1 250px; padding: 0.6rem 0.85rem; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg);
  color: var(--text); font: inherit; font-size: 0.95rem;
}
.signup-form input[type="email"]:focus { outline: none; border-color: var(--accent); }
.signup-form button { cursor: pointer; border: none; font: inherit; font-weight: 600; }
.signup-skip { margin: 0.85rem 0 0; font-size: 0.85rem; }
.signup-skip a { color: var(--text-soft); }
@media (max-width: 560px) { .signup-form input[type="email"] { flex-basis: 100%; } }
.signup-status { margin: 0.75rem 0 0; font-size: 0.9rem; color: var(--text-soft); min-height: 1.2em; }
.signup-status a { color: var(--accent); }