/* paulkaspers.nl, base stylesheet.
 * Single stylesheet for the whole site. Mobile-first, dark mode via prefers-color-scheme,
 * no external resources, no CDN fonts.
 */

/* --- design tokens ---------------------------------------------------- */

:root {
  color-scheme: light;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --color-bg: #faf9f6;
  --color-bg-soft: #f1efe9;
  --color-text: #1a1a1a;
  --color-text-muted: #555555;
  --color-accent: #1d4ed8;
  --color-accent-hover: #1e3a8a;
  --color-border: #d4d4d0;
  --color-code-bg: #ece9df;
  --color-focus: #1d4ed8;

  --measure: 36rem;
  --measure-wide: 60rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius: 4px;
}

/* Follow the OS preference unless the user explicitly picked 'light'. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --color-bg: #14140f;
    --color-bg-soft: #1f1f1a;
    --color-text: #e8e6e1;
    --color-text-muted: #a8a6a0;
    --color-accent: #93c5fd;
    --color-accent-hover: #bfdbfe;
    --color-border: #3a3a34;
    --color-code-bg: #24241f;
    --color-focus: #93c5fd;
  }
}

/* Manual override via theme.js (injected toggle button). */
:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #14140f;
  --color-bg-soft: #1f1f1a;
  --color-text: #e8e6e1;
  --color-text-muted: #a8a6a0;
  --color-accent: #93c5fd;
  --color-accent-hover: #bfdbfe;
  --color-border: #3a3a34;
  --color-code-bg: #24241f;
  --color-focus: #93c5fd;
}

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

/* --- reset & base ----------------------------------------------------- */

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

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

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1 0 auto; }

/* --- skip link -------------------------------------------------------- */

.skip-link {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: var(--space-4);
  top: var(--space-4);
  width: auto;
  height: auto;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg);
  color: var(--color-accent);
  border: 2px solid var(--color-focus);
  border-radius: var(--radius);
  z-index: 1000;
  font-family: var(--font-sans);
  font-weight: 600;
  text-decoration: none;
}

/* --- focus ------------------------------------------------------------ */

:focus { outline: none; }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

h1 {
  font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);
  margin-top: 0;
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.375rem, 1.2rem + 0.7vw, 1.625rem);
  margin-top: var(--space-12);
}

h3 {
  font-size: 1.25rem;
  margin-top: var(--space-8);
}

p, ul, ol { margin: 0 0 var(--space-4) 0; }

ul, ol { padding-left: 1.5rem; }
li { margin-bottom: var(--space-2); }

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

a:hover {
  color: var(--color-accent-hover);
  text-decoration-thickness: 2px;
}

strong { font-weight: 600; }
em { font-style: italic; }

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background-color: var(--color-code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background-color: var(--color-code-bg);
  padding: var(--space-4);
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
}

blockquote {
  margin: var(--space-6) 0;
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-border);
  color: var(--color-text-muted);
  font-style: italic;
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-12) 0;
}

/* --- page layout ------------------------------------------------------ */

.site-header,
.site-footer,
main {
  width: 100%;
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.site-header,
.site-footer { max-width: var(--measure-wide); }

main { max-width: var(--measure-wide); }

.prose {
  max-width: var(--measure);
  margin: 0 auto;
}

/* --- header & nav ----------------------------------------------------- */

.site-header {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-12);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-title {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.site-title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.site-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-6);
  font-family: var(--font-sans);
  font-size: 1rem;
}

.site-nav li { margin: 0; }

.site-nav a {
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) 0;
  display: inline-block;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
}

.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

.site-nav li:has(.theme-toggle) {
  margin-left: var(--space-2);
}

.site-nav .theme-toggle {
  background: transparent;
  border: 1px solid transparent;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  margin: calc(var(--space-2) * -1) 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.2;
  min-height: 0;
  border-radius: var(--radius);
  cursor: pointer;
  display: inline-block;
}

.site-nav .theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-border);
  background-color: var(--color-bg-soft);
}

.site-nav .theme-toggle svg {
  width: 1em;
  height: 1em;
  vertical-align: -0.15em;
  margin-right: 0.4em;
}

.site-nav .lang-switcher {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: var(--space-2) var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

.site-nav .lang-switcher:hover {
  color: var(--color-text);
  border-color: var(--color-border);
  background-color: var(--color-bg-soft);
}

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

.site-footer {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  margin-top: var(--space-16);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-8);
  justify-content: space-between;
}

.site-footer p { margin: 0; }

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.site-footer li { margin: 0; }

/* --- article ---------------------------------------------------------- */

.article-meta {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.article-meta time { font-variant-numeric: tabular-nums; }

article header h1 { margin-bottom: var(--space-2); }

article p:first-of-type::first-letter {
  /* Subtle emphasis on the opening letter, no drop cap, just a touch heavier. */
  font-weight: 500;
}

/* --- article list ----------------------------------------------------- */

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.article-list > li { margin: 0; }

.article-list article > h2 {
  margin-top: 0;
  margin-bottom: var(--space-2);
  font-family: var(--font-sans);
  font-size: 1.5rem;
}

.article-list article > h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.article-list article > h2 a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.article-list .article-meta {
  margin-bottom: var(--space-3);
}

.article-list p { margin-bottom: var(--space-3); }

.article-list .read-more {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
}

/* --- homepage intro --------------------------------------------------- */

.intro {
  padding-bottom: var(--space-12);
  margin-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.intro p { font-size: 1.1875rem; }

.section-title {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-top: 0;
  margin-bottom: var(--space-6);
}

/* --- tools ------------------------------------------------------------ */

.tool-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 40rem) {
  .tool-list { grid-template-columns: repeat(2, 1fr); }
}

.tool-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-6);
  background-color: var(--color-bg-soft);
}

.tool-card h2 {
  margin-top: 0;
  margin-bottom: var(--space-2);
  font-size: 1.25rem;
}

.tool-card h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.tool-card h2 a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.tool-card p:last-child { margin-bottom: 0; }

/* --- form elements for tools ------------------------------------------ */

label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

textarea,
input[type="text"],
input[type="file"],
select,
button {
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
}

textarea,
input[type="text"],
select {
  width: 100%;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  color: var(--color-text);
}

textarea {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  min-height: 8rem;
  resize: vertical;
}

textarea:focus-visible,
input:focus-visible,
select:focus-visible {
  border-color: var(--color-focus);
}

button {
  background-color: var(--color-accent);
  color: #ffffff;
  border: 1px solid var(--color-accent);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 600;
  min-height: 44px;
  transition: background-color 0.15s ease;
}

button:hover { background-color: var(--color-accent-hover); border-color: var(--color-accent-hover); }

button.secondary {
  background-color: transparent;
  color: var(--color-accent);
}

button.secondary:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-accent-hover);
}

@media (prefers-color-scheme: dark) {
  button { color: #14140f; }
  button:hover { color: #14140f; }
}

.tool-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-4) 0;
}

.tool-output {
  margin-top: var(--space-4);
}

.tool-status {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  min-height: 1.5em;
}

.tool-status.error { color: #b91c1c; }

@media (prefers-color-scheme: dark) {
  .tool-status.error { color: #fca5a5; }
}

.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-8);
  text-align: center;
  background-color: var(--color-bg-soft);
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.dropzone:hover,
.dropzone.is-active {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.dropzone:focus-within {
  border-color: var(--color-focus);
}

dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--space-2) var(--space-6);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  margin: var(--space-4) 0;
}

dt { font-weight: 600; color: var(--color-text-muted); }
dd { margin: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  margin: var(--space-4) 0;
}

th, td {
  text-align: left;
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  background-color: var(--color-bg-soft);
}

.list-footer {
  margin-top: var(--space-8);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
}

/* --- extension lookup results ----------------------------------------- */

.ext-results { margin-top: var(--space-4); }

.ext-entry,
.ext-suggestions {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.ext-entry > header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.ext-entry > header h3 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  margin: 0;
  color: var(--color-accent);
}

.ext-count {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin: 0;
}

.ext-interpretation {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-6);
  margin-bottom: var(--space-4);
}

.ext-interpretation h4 {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 var(--space-3) 0;
}

.ext-platforms {
  margin: 0 0 var(--space-3) 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.platform-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-muted);
}

.ext-meta {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-3) 0;
}

.ext-description {
  margin: 0 0 var(--space-3) 0;
  font-size: 1rem;
}

.ext-magic {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.ext-suggestion-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.ext-suggestion-list li { margin: 0; }

button.ext-suggestion {
  background-color: var(--color-bg);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  min-height: 0;
}

button.ext-suggestion:hover {
  border-color: var(--color-accent);
  background-color: var(--color-bg-soft);
}

@media (prefers-color-scheme: dark) {
  button.ext-suggestion:hover { color: var(--color-accent-hover); }
}

/* --- next steps (toolchain handoff) ----------------------------------- */

.next-steps {
  margin-top: var(--space-6);
  padding: var(--space-4) var(--space-6);
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.next-steps h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-3) 0;
  color: var(--color-text);
}

.next-steps ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.next-steps li {
  margin: 0 0 var(--space-3) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3);
}

.next-steps li:last-child { margin-bottom: 0; }

.next-steps button {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  min-height: 0;
}

.next-steps button:hover {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

@media (prefers-color-scheme: dark) {
  .next-steps button:hover { color: var(--color-bg); }
}

.next-steps .hint {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.handoff-banner {
  margin-bottom: var(--space-6);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg-soft);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
}

.handoff-banner p {
  margin: 0;
}

.handoff-banner strong {
  color: var(--color-text);
}

/* --- visually hidden, still exposed to screen readers ----------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- reduced motion --------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- print ------------------------------------------------------------ */

@media print {
  body { font-size: 11pt; color: #000; background: #fff; }
  .site-nav, .site-footer ul { display: none; }
  a { color: #000; text-decoration: underline; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.85em; }
  .prose { max-width: none; }
}