/* ============================================================
   jeffreypratt.net — main stylesheet
   ============================================================ */

/* --- Self-hosted Castoro (TiroTypeworks/Castoro v3.01 on GitHub) --- */
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-Regular.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-Regular.woff")  format("woff");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-Italic.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-Italic.woff")  format("woff");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-Medium.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-Medium.woff")  format("woff");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-MediumItalic.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-MediumItalic.woff")  format("woff");
  font-weight: 500;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-Semibold.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-Semibold.woff")  format("woff");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-SemiboldItalic.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-SemiboldItalic.woff")  format("woff");
  font-weight: 600;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-Bold.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-Bold.woff")  format("woff");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Castoro";
  src: url("../fonts/castoro/Castoro-BoldItalic.woff2") format("woff2"),
       url("../fonts/castoro/Castoro-BoldItalic.woff")  format("woff");
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}

/* --- CSS custom properties --- */
:root {
  --font-body: "Castoro", Georgia, "Times New Roman", Times, serif;
  --font-code: "Google Sans Code", ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  --color-bg:         #ffffff;
  --color-text:       #1a1a1a;
  --color-text-muted: #555555;
  --color-link:       #0066cc;
  --color-link-hover: #004499;
  --color-border:     #e0e0e0;
  --color-code-bg:    #f5f5f5;
  --color-tag-bg:     #eef3fa;
  --color-tag-text:   #0055aa;

  /* 1rem = 10px (62.5% of 16px browser default) */
  --max-width:    93rem;  /* 930px */
  --spacing-sm:   1rem;   /*  10px */
  --spacing-md:   2rem;   /*  20px */
  --spacing-lg:   4rem;   /*  40px */
  --spacing-xl:   6rem;   /*  60px */
}

[data-theme="dark"],
.dark-mode {
  --color-bg:         #1a1a1a;
  --color-text:       #e8e8e8;
  --color-text-muted: #aaaaaa;
  --color-link:       #5599ee;
  --color-link-hover: #88bbff;
  --color-border:     #3a3a3a;
  --color-code-bg:    #2a2a2a;
  --color-tag-bg:     #1e2a3a;
  --color-tag-text:   #88bbff;
}

/* Auto mode: follow system preference unless user has set a theme */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --color-bg:         #1a1a1a;
    --color-text:       #e8e8e8;
    --color-text-muted: #aaaaaa;
    --color-link:       #5599ee;
    --color-link-hover: #88bbff;
    --color-border:     #3a3a3a;
    --color-code-bg:    #2a2a2a;
    --color-tag-bg:     #1e2a3a;
    --color-tag-text:   #88bbff;
  }
}

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

/*
 * 62.5% trick: makes 1rem = 10px (at the 16px browser default).
 * Body text is set to 2rem = 20px. All rem values below are
 * therefore multiples of 10px for straightforward mental arithmetic.
 */
html {
  font-size: 62.5%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 2rem;     /* 20px */
  line-height: 1.5;
  transition: background 0.2s, color 0.2s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  margin-top: 3.6rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

h1 { font-size: 3.6rem; }  /* 36px */
h2 { font-size: 2.8rem; }  /* 28px */
h3 { font-size: 2.2rem; }  /* 22px */

p { margin: 0 0 2rem; }

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: var(--color-link-hover); }

blockquote {
  margin: 3rem 0;
  padding: 1rem 2.5rem;
  border-left: 3px solid var(--color-border);
  color: var(--color-text-muted);
  font-style: italic;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 4rem 0;
}

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

/* --- Code --- */
code, kbd, samp {
  font-family: var(--font-code);
  font-size: 0.875em;
}

:not(pre) > code {
  background: var(--color-code-bg);
  padding: 0.15em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--color-code-bg);
  padding: 2rem 2.5rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
  margin: 3rem 0;
  /* Setting font-size here (not just on pre code) ensures the block's
     anonymous "strut" uses the same metrics as the code lines, so the
     line-number spans stay aligned throughout. */
  font-size: 1.6rem;  /* 16px */
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;  /* override the 0.875em from code, kbd, samp */
}

/* --- Code block: line numbers + copy button (added by code.js) --- */

/* .code-block wraps the pre so the copy button can be positioned
   outside the pre's scroll container. */
.code-block {
  position: relative;
  margin: 3rem 0;
}

.code-block pre {
  margin: 0;
  /* Extra left padding makes room for the line-number gutter (5rem)
     plus a gap (1.5rem) between the gutter border and the code. */
  padding-left: 7rem;
}

/* The gutter itself: one child <span> per line, positioned absolute
   so it sits in the pre's left padding area. */
.line-numbers-rows {
  position: absolute;
  top: 0;
  left: 0;
  width: 5.5rem;
  padding-top: 2rem;   /* matches pre padding-top */
  padding-bottom: 2rem;
  bottom: 0;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  border-right: 1px solid var(--color-border);
  font-family: var(--font-code);
  font-size: 1.6rem;  /* matches pre code */
  line-height: 1.5;
  counter-reset: linenumber;
}

.line-numbers-rows > span {
  display: block;
  counter-increment: linenumber;
}

.line-numbers-rows > span::before {
  content: counter(linenumber);
  color: var(--color-text-muted);
  display: block;
  padding-right: 1rem;
  text-align: right;
}

/* Copy button: sits in the top-right corner of the wrapper. */
.code-copy-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.3rem 1rem;
  background: var(--color-code-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: var(--font-code);
  font-size: 1.3rem;  /* 13px */
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  z-index: 1;
}

.code-copy-btn:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.code-copy-btn.is-copied {
  color: #2a9a6a;
  border-color: #2a9a6a;
}

/* --- KaTeX --- */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1rem 0;
}


/* --- Layout --- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-logo {
  font-size: 2.2rem;  /* 22px */
  font-weight: bold;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}
.site-logo:hover { color: var(--color-link); }

.site-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 1.9rem;  /* 19px */
}
.site-nav a:hover { color: var(--color-link); }

.site-header__right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* Social links */
.social-links {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.social-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
}
.social-links a:hover { color: var(--color-link); }

/* Theme toggle */
.theme-toggle {
  display: flex;
  gap: 0.25rem;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 2px;
}

.theme-toggle button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 1.4rem;  /* 14px */
  padding: 2px 8px;
  border-radius: 16px;
  transition: background 0.15s, color 0.15s;
}

.theme-toggle button.active {
  background: var(--color-link);
  color: #fff;
}

.theme-toggle button:hover:not(.active) {
  background: var(--color-code-bg);
  color: var(--color-text);
}

/* Main content */
.site-main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1.6rem;  /* 16px */
  color: var(--color-text-muted);
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-footer p { margin: 0; }

/* --- Blog listing --- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list__item {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list__item:first-child { padding-top: 0; }

.post-list__date {
  font-size: 1.6rem;  /* 16px */
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.post-list__title {
  margin: 0 0 0.7rem;
  font-size: 2.2rem;  /* 22px */
}

.post-list__title a {
  color: var(--color-text);
  text-decoration: none;
}

.post-list__title a:hover { color: var(--color-link); }

.post-list__excerpt {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.8rem;  /* 18px */
}

/* --- Post --- */
.post__header { margin-bottom: 4rem; }

.post__title { margin-top: 0; }

.post__meta {
  display: flex;
  align-items: baseline;
  gap: 2rem;
  flex-wrap: wrap;
  font-size: 1.6rem;  /* 16px */
  color: var(--color-text-muted);
}

.post__tags { display: flex; gap: 0.8rem; flex-wrap: wrap; }

/* Tags */
.tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 1px 8px;
  border-radius: 3px;
  font-size: 1.4rem;  /* 14px */
  text-decoration: none;
}
.tag:hover { opacity: 0.8; }

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-border);
  font-size: 1.8rem;  /* 18px */
}

.pagination a { color: var(--color-link); text-decoration: none; }
.pagination a:hover { text-decoration: underline; }
.pagination__count { color: var(--color-text-muted); }

/* --- Projects --- */
.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.project-list__item {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.project-list__item:first-child { padding-top: 0; }

.project-list__name {
  margin: 0 0 0.7rem;
  font-size: 2.2rem;  /* 22px */
}

.project-list__desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.8rem;
  font-style: italic;
}

/* --- Tag index page --- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 3rem 0;
}

/* --- Contact form --- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-top: 3rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.form-group label {
  font-size: 1.8rem;  /* 18px */
  font-weight: bold;
}

.form-group input,
.form-group textarea {
  font-family: var(--font-body);
  font-size: 2rem;  /* 20px — matches body */
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1rem 1.5rem;
  width: 100%;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-link);
}

.form-group textarea { min-height: 16rem; resize: vertical; }

.btn {
  display: inline-block;
  background: var(--color-link);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 1.2rem 2.8rem;
  font-family: var(--font-body);
  font-size: 2rem;  /* 20px */
  cursor: pointer;
  text-decoration: none;
  align-self: flex-start;
  transition: background 0.15s;
}

.btn:hover { background: var(--color-link-hover); color: #fff; }

/* --- Responsive --- */
@media (max-width: 600px) {
  html { font-size: 56.25%; }  /* 1rem ≈ 9px; body ≈ 18px */

  .site-header__inner { gap: 1.5rem; }

  .site-header__right { margin-left: 0; width: 100%; }

  .site-main { padding: var(--spacing-lg) var(--spacing-md); }
}