/* 6502.org - Modern Stylesheet
   A contemporary look that preserves the site's identity */

/* === Design Tokens === */
:root {
  --blue-700: #1e4f7a;
  --blue-600: #2a6099;
  --blue-500: #3574b4;
  --blue-400: #5a9fd4;
  --blue-100: #e0ecf5;
  --blue-75:  #e8f0f8;
  --blue-50:  #f0f5fa;

  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #2d3748;
  --gray-500: #4a5261;
  --gray-400: #6b7585;
  --gray-300: #b8bfc7;
  --gray-200: #d5d9df;
  --gray-100: #ebedf0;
  --gray-50:  #f4f5f7;

  --white: #ffffff;
  --green-700: #2d6a30;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Verdana, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Monaco, Consolas, "Courier New", monospace;
  --max-width: 1100px;
  --radius: 6px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.12);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.14);
  --transition: 150ms ease;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--gray-50);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

p  { padding: 0; margin: 12px 0 0 0; }
li { padding-bottom: 6px; }
form { margin: 0; padding: 0; }

a:link    { font-family: var(--font-body); text-decoration: none; color: var(--blue-600); transition: color var(--transition); }
a:visited { font-family: var(--font-body); text-decoration: none; color: var(--blue-700); }
a:hover   { font-family: var(--font-body); text-decoration: underline; color: var(--blue-500); }

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

/* === Legacy table defaults (for static pages in public/) === */
table { width: 100%; margin: 0; border-width: 0; }
td {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--gray-900);
  background-color: transparent;
  vertical-align: top;
  text-align: left;
}

/* === Named anchors (no href) should not look like links === */
a[name]:not([href]),
a[name]:not([href]):hover,
a[name]:not([href]):active {
  color: inherit;
  text-decoration: none;
  cursor: default;
}

.content-page a[name]:not([href]),
.content-page a[name]:not([href]):hover {
  color: inherit;
  text-decoration: none;
  cursor: default;
}

/* === Breadcrumbs === */
.breadcrumbs {
  padding-bottom: 10px;
  font-size: 14px;
  color: var(--gray-500);
}

/* === Documents Archive === */
.doc-folder {
  padding: 0 0 10px 15px;
  font-weight: bold;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 4px;
}

.doc-folder-desc {
  width: 100%;
  padding: 6px 0 2px 28px;
  font-weight: normal;
}

.doc-list {
  padding: 5px 0 0 15px;
}

.doc-item {
  padding-bottom: 15px;
}

.doc-item-detail {
  padding-left: 20px;
}

.doc-obsolete {
  display: none;
}

.doc-hidden {
  opacity: 0.4;
}

.doc-older-link {
  color: var(--gray-500);
  text-decoration: none;
  margin-left: 4px;
}

.doc-older-link:hover {
  color: var(--blue-500);
  text-decoration: underline;
}

@keyframes doc-highlight-fade {
  from { background-color: #fef9c3; }
  to   { background-color: transparent; }
}

.doc-highlight {
  animation: doc-highlight-fade 10s ease-out;
}

/* === Groups filter === */
.groups-filter {
  font-size: 13px;
  color: var(--gray-600);
  background: var(--gray-100);
  padding: 8px 12px;
  border-radius: var(--radius);
  margin: 12px 0 4px 0;
  display: inline-block;
}

.groups-filter label {
  cursor: pointer;
}

/* === Flash Messages === */
.flash-notice, .flash-alert {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 20px;
  font-size: 14px;
}

.flash-notice {
  background: #f0fdf4;
  border-bottom: 1px solid #bbf7d0;
  color: #166534;
}

.flash-alert {
  background: #fef2f2;
  border-bottom: 1px solid #fca5a5;
  color: #991b1b;
}

/* === Error Pages === */
.error-page {
  text-align: center;
  padding-top: 60px;
  padding-bottom: 60px;
}

.error-code {
  font-size: 48px;
  font-weight: 700;
  color: var(--blue-700);
  margin: 0;
}

.error-message {
  font-size: 18px;
  color: var(--gray-700);
  margin-top: 8px;
}

.error-contact {
  margin-top: 16px;
}

.error-home {
  margin-top: 24px;
}

.error-home a {
  text-decoration: none;
  font-weight: 500;
}

/* === External link indicator === */
.content-page a[href^="http"]:not([href*="6502.org"])::after,
.two-col-main a[href^="http"]:not([href*="6502.org"])::after,
a.offsite::after {
  content: "\2009\2197";
  font-size: 0.75em;
  vertical-align: super;
  opacity: 0.5;
  text-decoration: none;
  display: inline-block;
}

/* === Code styling === */
.code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green-700);
  background-color: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 2px 6px;
}

/* === Site Header === */
.site-header {
  background: linear-gradient(135deg, var(--blue-700) 0%, var(--blue-600) 50%, var(--blue-500) 100%);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 10;
}

.site-header a {
  color: var(--white);
  text-decoration: none;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.site-header a:hover { text-decoration: none; color: var(--white); }

.env-badge {
  margin-left: auto;
  background: var(--white);
  color: #c00;
  font-weight: 700;
  font-size: 13px;
  padding: 4px 12px;
  border-radius: var(--radius);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.site-icon {
  width: 48px;
  height: 48px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  display: block;
  margin-top: 2px;
}

.site-title-group {
  display: flex;
  flex-direction: column;
}

.site-title {
  color: var(--white);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.site-subtitle {
  color: var(--white);
  font-size: 14px;
  font-weight: 400;
  opacity: 0.8;
  margin-top: 2px;
}

/* === Site Navigation === */
.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  padding: 0 20px;
  background-color: var(--white);
  border-bottom: 1px solid var(--gray-200);
  font-size: 14px;
  max-width: 100%;
}

.nav-title {
  font-weight: 600;
  font-size: 14px;
  padding: 10px 0;
  margin-right: auto;
  color: var(--gray-700);
}

.nav-links {
  display: flex;
  gap: 2px;
  flex-wrap: wrap;
  align-items: center;
}

.nav-links a {
  padding: 10px 14px;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background-color var(--transition), color var(--transition);
}

.nav-links a:hover {
  background-color: var(--blue-50);
  color: var(--blue-600);
  text-decoration: none;
}

.nav-links a.nav-active {
  background-color: var(--blue-75);
  color: var(--blue-600);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  font-size: 22px;
  line-height: 1;
  color: var(--gray-700);
  border-radius: var(--radius);
  transition: background-color var(--transition);
}

.nav-toggle:hover {
  background-color: var(--gray-100);
}

/* === Site Footer === */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--gray-500);
  padding: 20px;
  border-top: 1px solid var(--gray-200);
  background-color: var(--white);
  margin-top: 40px;
}

.site-footer a {
  text-decoration: underline;
  font-size: 13px;
  color: var(--gray-500);
}

.site-footer a:hover {
  color: var(--blue-600);
}

/* === Content Page (single column) === */
.content-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 40px;
  background-color: var(--white);
  min-height: 50vh;
  font-size: 15px;
}

.content-page a:link,
.home-main a:link,
.two-col-main a:link        { text-decoration: underline; }
.content-page a:visited,
.home-main a:visited,
.two-col-main a:visited     { text-decoration: underline; }
.content-page a:hover,
.home-main a:hover,
.two-col-main a:hover       { text-decoration: underline; color: var(--blue-500); }

/* === Home Page Layout === */
.home-layout {
  display: flex;
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: var(--white);
  min-height: 50vh;
}

.home-main {
  flex: 1;
  min-width: 0;
  padding: 0 24px 40px 20px;
}

.home-sidebar {
  flex-shrink: 0;
  width: 290px;
  padding: 0 20px 24px 0;
  margin-top: 24px;
}

/* === Two-Column Layout (Documents, etc.) === */
.two-col-layout {
  display: flex;
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: var(--white);
  min-height: 50vh;
}

.two-col-main {
  flex: 1;
  min-width: 0;
  padding: 20px;
}

.two-col-sidebar {
  flex-shrink: 0;
  width: 290px;
  padding: 0 20px 20px 0;
  margin-top: 20px;
}

/* === Sidebar Boxes === */
.sidebar-box {
  margin-top: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}

.sidebar-box:first-child {
  margin-top: 0;
}

.sidebar-box .boxtitle {
  background: linear-gradient(135deg, var(--blue-700), var(--blue-600));
  color: var(--white);
  font-weight: 600;
  font-size: 13px;
  text-align: left;
  padding: 10px 14px;
}

.sidebar-box .box {
  background-color: var(--white);
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 450;
  line-height: 1.8;
}

.sidebar-box .box p:first-child {
  margin-top: 0;
}

.sidebar-box .box a:link    { font-size: 14px; color: var(--blue-600); text-decoration: none; }
.sidebar-box .box a:visited { font-size: 14px; color: var(--blue-700); }
.sidebar-box .box a:hover   { text-decoration: underline; color: var(--blue-500); }

.sidebar-list {
  list-style: disc;
  list-style-position: inside;
  margin: 0;
  padding: 12px 14px;
}

.sidebar-list li {
  padding-bottom: 2px;
}

.sidebar-box .sidebar-note {
  color: var(--gray-700);
  margin: 0;
  padding: 12px 14px 0;
}

.sidebar-box .sidebar-note + .sidebar-list {
  padding-top: 4px;
}

/* === Section Headings === */
.section-heading {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-700);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 24px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--gray-200);
}

.two-col-main > .section-heading:first-child {
  margin-top: 0;
}


/* === Featured Cards === */
.featured-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.featured-card {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition);
}

.featured-card:hover {
  box-shadow: var(--shadow-lg);
  background-color: var(--blue-50);
  border-color: var(--blue-500);
  text-decoration: none;
}

.featured-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  object-position: top;
}

.featured-card img.featured-card-center {
  object-position: center;
  display: block;
}

.featured-card-body {
  padding: 12px 14px;
}

.featured-card-body strong {
  display: block;
  font-size: 15px;
  color: var(--blue-600);
  margin-bottom: 4px;
}

.featured-card-body span {
  font-size: 13px;
  color: var(--gray-700);
  line-height: 1.4;
  text-decoration: none;
}

a.featured-card:link,
a.featured-card:visited,
a.featured-card:hover {
  text-decoration: none;
}

/* === Sidebar Callout === */
.sidebar-callout {
  margin-top: 24px;
  padding: 14px 16px;
  border: 1px dashed var(--gray-300);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-600);
}

.sidebar-callout strong {
  display: block;
  color: var(--gray-700);
  font-size: 14px;
  margin-bottom: 4px;
}

.sidebar-callout p {
  margin: 0;
}

.sidebar-callout p + p {
  margin-top: 10px;
}

.sidebar-callout a {
  color: var(--blue-600);
  font-weight: 500;
}

/* === Home Page Link Grid === */
.home-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 24px;
  margin-left: -13px;
}

/* === Home Page Link Items === */
.home-link-item {
  padding: 12px 14px 12px 10px;
  margin-bottom: 4px;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background-color var(--transition), border-color var(--transition);
}

.home-link-item:hover {
  background-color: var(--blue-50);
  border-left-color: var(--blue-500);
}

.home-link-item b a {
  font-size: 15px;
  color: var(--blue-600);
  text-decoration: none;
}

.home-link-item b a:hover {
  text-decoration: underline;
}

/* === News Items === */
.news-item {
  display: flex;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-100);
}

.news-item:first-child {
  padding-top: 0;
}

.news-date {
  flex-shrink: 0;
  width: 100px;
  font-size: 13px;
  color: var(--gray-500);
  white-space: nowrap;
  padding-top: 1px;
}

.news-body {
  flex: 1;
  min-width: 0;
}

/* === Mini-Project Items === */
.mini-project-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-100);
}

.mini-project-item:last-child {
  border-bottom: none;
}

.mini-project-item > a {
  font-weight: 500;
  font-size: 15px;
}

.mini-project-item .mp-author {
  color: var(--gray-500);
  font-size: 13px;
  margin-left: 4px;
}

.mini-project-item .mp-desc {
  margin-top: 6px;
  color: var(--gray-700);
  line-height: 1.5;
}

/* === Category Headers (folder icons on content pages) === */
.category-header {
  margin: 0;
  padding-top: 20px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* === Author bylines === */
.author {
  font-size: 12px;
  color: var(--gray-500);
}

/* === Description lists (no bullets) === */
.desc {
  list-style-type: none;
}

/* === Author bylines (inline font-size:10px spans on many pages) === */
.content-page span[style*="font-size:10px"],
.content-page span[style*="font-size: 10px"] {
  font-size: 12px !important;
  color: var(--gray-500);
}

/* === Content page lists === */
.content-page ul {
  padding-left: 28px;
}

.content-page ul li {
  margin-bottom: 5px;
}

.content-page ul li p {
  margin-top: 4px;
}

.item-desc {
  margin: 4px 0 0 28px;
}

/* === Better selection highlight === */
::selection {
  background-color: var(--blue-100);
  color: var(--gray-900);
}

/* === Focus styles for accessibility === */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blue-500);
  outline-offset: 2px;
  border-radius: 2px;
}

/* === About page: Section intros === */
.section-intro {
  color: var(--gray-500);
  font-size: 14px;
  margin: 0 0 16px;
}

/* === About page: Maintainers === */
.maintainer {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.maintainer-photo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.maintainer-info b {
  font-size: 16px;
}

.maintainer-info p {
  margin-top: 4px;
  color: var(--gray-700);
}

.forum-handle {
  font-size: 13px;
  color: var(--gray-400);
}

.forum-handle::before {
  content: "(";
}

.forum-handle::after {
  content: ")";
}

/* === About page: Contributors === */
.contributors-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 8px;
}

.contributor-hidden {
  display: none;
}

.contributors-grid a {
  display: block;
}

.contributors-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
}

/* === About page: In Memoriam === */
.memorial-panels {
  display: flex;
  gap: 24px;
}

.memorial-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 16px;
  background: var(--gray-50);
  border-radius: var(--radius);
}


.memorial-photo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 8px;
}

.memorial-panel b {
  display: block;
  font-size: 15px;
}

.memorial-panel b a:link,
.memorial-panel b a:visited {
  color: inherit;
  text-decoration: none;
}

.memorial-panel b a:hover {
  color: var(--blue-600);
  text-decoration: none;
}

.memorial-date {
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 2px;
}

.memorial-panel p {
  margin-top: 8px;
  text-wrap: balance;
  font-size: 14px;
  color: var(--gray-700);
}

/* === Responsive === */
@media (max-width: 768px) {
  .site-header {
    padding: 12px 16px;
  }

  .site-icon {
    width: 40px;
    height: 40px;
  }

  .site-title {
    font-size: 22px;
  }

  .site-subtitle {
    font-size: 12px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    padding: 0 16px;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    padding: 4px 0 8px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 10px 8px;
    border-radius: 0;
    width: 100%;
  }

  .home-layout,
  .two-col-layout {
    flex-direction: column;
  }

  .home-sidebar,
  .two-col-sidebar {
    width: 100%;
    padding: 0 16px 20px;
  }

  .home-main {
    padding: 20px 16px 0 16px;
  }

  .content-page {
    padding: 20px 16px 32px;
  }

  .site-footer {
    flex-direction: column;
    gap: 6px;
    padding: 16px;
    margin-top: 24px;
  }

  .featured-cards,
  .home-links-grid {
    grid-template-columns: 1fr;
  }

  .memorial-panels {
    flex-direction: column;
  }

  .home-link-item {
    padding: 12px 8px;
  }

  .news-item {
    flex-direction: column;
    gap: 2px;
  }

  .news-date {
    width: auto;
    font-weight: 600;
  }

  pre {
    overflow-x: auto;
    max-width: 100%;
  }

  table {
    display: block;
    overflow-x: auto;
  }
}