/* ==========================================================================
   Blueprint Design System
   Based on cascette-rs Ribbit server UI + growingSWE blog typography.
   Pure CSS, no build tools, no JavaScript frameworks.
   ========================================================================== */

/* --- Fonts --------------------------------------------------------------- */

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/JetBrainsMono-Regular.woff2) format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/JetBrainsMono-Italic.woff2) format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/JetBrainsMono-Medium.woff2) format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(fonts/JetBrainsMono-Bold.woff2) format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url(fonts/JetBrainsMono-ExtraBold.woff2) format("woff2");
}

/* --- Variables ----------------------------------------------------------- */

:root {
  --bp-blue: #3b82f6;
  --bp-blue-light: #93c5fd;
  --bp-blue-bg: rgba(59, 130, 246, 0.08);
  --bp-blue-bg-soft: rgba(59, 130, 246, 0.03);
  --bp-blue-accent: rgba(59, 130, 246, 0.12);
  --bp-text: #334155;
  --bp-text-label: #475569;
  --bp-muted: #94a3b8;
  --bp-border: #cbd5e1;
  --bp-border-strong: #94a3b8;
  --bp-border-light: #cbd5e1;
  --background: #fff;
  --foreground: #1a1a1a;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono",
    Menlo, Consolas, "Liberation Mono", monospace;
}

/* --- Reset --------------------------------------------------------------- */

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.6;
  color: var(--foreground);
  background: var(--background);
}

/* --- Grid background ----------------------------------------------------- */

.bp-grid-bg {
  background-image: radial-gradient(
    circle,
    rgba(59, 130, 246, 0.12) 1px,
    transparent 1px
  );
  background-size: 24px 24px;
  min-height: 100vh;
  position: relative;
}

/* --- Corner marks -------------------------------------------------------- */

.bp-corner-marks {
  position: absolute;
  inset: 24px;
  pointer-events: none;
}

.bp-corner-mark {
  border-color: var(--bp-muted);
  pointer-events: none;
  opacity: 0.5;
  width: 12px;
  height: 12px;
  position: absolute;
}

.bp-corner-mark--tl {
  border-top: 1px solid;
  border-left: 1px solid;
  top: 0;
  left: 0;
}
.bp-corner-mark--tr {
  border-top: 1px solid;
  border-right: 1px solid;
  top: 0;
  right: 0;
}
.bp-corner-mark--bl {
  border-bottom: 1px solid;
  border-left: 1px solid;
  bottom: 0;
  left: 0;
}
.bp-corner-mark--br {
  border-bottom: 1px solid;
  border-right: 1px solid;
  bottom: 0;
  right: 0;
}

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

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px 64px;
  position: relative;
}

/* --- Header -------------------------------------------------------------- */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 0;
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--bp-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-accent {
  color: var(--bp-blue);
}

.nav-link {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bp-muted);
  font-size: 0.72rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--bp-blue);
}

/* --- Hero ---------------------------------------------------------------- */

.hero {
  padding: 64px 0 0;
}

.hero h1 {
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--bp-text);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-body {
  color: var(--bp-muted);
  font-size: 0.88rem;
  line-height: 1.75;
  max-width: 600px;
  margin-bottom: 24px;
}

.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bp-blue);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: gap 0.2s;
}

.cta-link:hover {
  gap: 10px;
}

/* --- Dividers ------------------------------------------------------------ */

.section-divider {
  border: none;
  border-top: 1px dashed var(--bp-border);
  margin: 24px 0;
}

/* --- Stat cards ---------------------------------------------------------- */

.stat-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 24px 0;
}

.stat-card {
  border: 1px solid var(--bp-border);
  background: var(--background);
  border-radius: 2px;
  padding: 16px 20px;
  transition: 0.25s;
}

.stat-card:hover {
  border-color: var(--bp-blue);
  box-shadow: 0 0 0 1px var(--bp-blue);
  transform: translateY(-2px);
}

.stat-label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--bp-text-label);
  font-size: 0.7rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.stat-value {
  color: var(--bp-text);
  font-size: 1.25rem;
  font-weight: 700;
}

/* --- Info box ------------------------------------------------------------ */

.info-box {
  border: 1px dashed var(--bp-border-strong);
  background: var(--bp-blue-bg-soft);
  border-radius: 2px;
  padding: 12px 16px;
  font-size: 0.82rem;
  color: var(--bp-text);
  line-height: 1.6;
}

/* --- Product / card grid ------------------------------------------------- */

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.product-card {
  border: 1px solid var(--bp-border);
  background: var(--background);
  border-radius: 2px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: 0.25s;
  display: block;
}

.product-card:hover {
  border-color: var(--bp-blue);
  box-shadow: 0 0 0 1px var(--bp-blue);
  transform: translateY(-2px);
}

.product-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--bp-text);
  margin-bottom: 6px;
}

.product-meta {
  font-size: 0.75rem;
  color: var(--bp-muted);
  line-height: 1.6;
}

/* --- Tag buttons --------------------------------------------------------- */

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 16px 0;
}

.tag-btn {
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--bp-muted);
  background: transparent;
  border: 1px solid var(--bp-muted);
  border-radius: 3px;
  padding: 4px 10px;
  cursor: pointer;
  text-decoration: none;
  transition: 0.15s;
}

.tag-btn:hover,
.tag-btn.active {
  color: var(--bp-blue);
  border-color: var(--bp-blue);
  background: var(--bp-blue-bg);
}

/* --- Blog post list (listing page) --------------------------------------- */

.post-list {
  display: flex;
  flex-direction: column;
}

.post-entry {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 16px 0;
  border-top: 1px dashed var(--bp-border);
  transition: background 0.15s;
}

.post-entry:last-child {
  border-bottom: 1px dashed var(--bp-border);
}

.post-entry:hover {
  background: var(--bp-blue-bg-soft);
}

.post-entry:hover .post-title {
  color: var(--bp-blue);
}

.post-date {
  font-size: 0.68rem;
  color: var(--bp-muted);
  margin-bottom: 4px;
}

.post-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--foreground);
  margin-bottom: 4px;
  transition: color 0.15s;
}

.post-excerpt {
  font-size: 0.82rem;
  color: var(--bp-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.post-tag {
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--bp-muted);
  border: 1px solid var(--bp-border);
  border-radius: 2px;
  padding: 2px 8px;
}

/* --- Article layout ------------------------------------------------------ */

.bp-article {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.bp-header {
  padding: 2rem 0 2.5rem;
}

.bp-back-link {
  color: var(--bp-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  transition: color 0.15s;
  display: inline-flex;
}

.bp-back-link:hover {
  color: var(--bp-blue);
}

.bp-back-link svg {
  width: 14px;
  height: 14px;
}

/* --- Article content typography ------------------------------------------ */

.bp-content {
  color: var(--bp-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.8;
}

.bp-content h1 {
  color: var(--bp-text);
  margin: 0 0 1.5rem;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
}

.bp-content h2 {
  color: var(--bp-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px dashed var(--bp-border-light);
  margin: 3rem 0 1rem;
  padding-bottom: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
}

.bp-content h3 {
  color: var(--bp-text-label);
  margin: 2rem 0 0.75rem;
  font-size: 1rem;
  font-weight: 700;
}

.bp-content p {
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
}

.bp-content ul,
.bp-content ol {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
  font-size: 0.92rem;
}

.bp-content li {
  margin-bottom: 0.4rem;
}

.bp-content strong {
  color: var(--bp-text);
  font-weight: 700;
}

.bp-content em {
  font-style: italic;
}

.bp-content blockquote {
  border-left: 2px solid var(--bp-blue);
  color: var(--bp-text-label);
  background: var(--bp-blue-bg-soft);
  border-radius: 0 2px 2px 0;
  margin: 1.25rem 0;
  padding: 0.75rem 1rem;
  font-size: 0.88rem;
  font-style: normal;
}

.bp-content blockquote p {
  margin-bottom: 0;
}

.bp-content code {
  border: 1px solid var(--bp-border-light);
  color: var(--bp-text);
  background: rgba(148, 163, 184, 0.1);
  border-radius: 2px;
  padding: 0.15rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.bp-content pre {
  border: 1px solid var(--bp-border-light);
  background: #f8fafc;
  border-radius: 2px;
  margin: 1.25rem 0;
  padding: 1rem;
  font-size: 0.85rem;
  line-height: 1.6;
  overflow-x: auto;
}

.bp-content pre code {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
}

.bp-content a {
  color: var(--bp-blue);
  border-bottom: 1px solid var(--bp-border-light);
  text-decoration: none;
  transition: border-color 0.15s;
}

.bp-content a:hover {
  border-bottom-color: var(--bp-blue);
}

.bp-content hr {
  border: none;
  border-top: 1px dashed var(--bp-border-light);
  margin: 2rem 0;
}

/* Article tables */

.bp-content table {
  border-collapse: collapse;
  border: 1px dashed var(--bp-border-light);
  border-radius: 2px;
  width: 100%;
  font-size: 0.85rem;
  margin: 1.25rem 0;
  overflow: hidden;
}

.bp-content thead {
  border-bottom: 1px dashed var(--bp-border-light);
}

.bp-content th {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--bp-muted);
  border: none;
  padding: 8px 12px;
  font-size: 0.65rem;
  font-weight: 600;
}

.bp-content td {
  text-align: left;
  color: var(--bp-text);
  padding: 8px 12px;
}

.bp-content tr {
  border-bottom: 1px dashed var(--bp-border-light);
}

.bp-content tr:last-child {
  border-bottom: none;
}

.bp-content th + th,
.bp-content td + td {
  border-left: 1px dashed var(--bp-border-light);
}

/* Article images */

.bp-content img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--bp-border-light);
  border-radius: 2px;
  margin: 1.25rem 0;
}

/* --- Demo card (for interactive / figure content) ------------------------ */

.bp-demo-card {
  background: var(--background);
  border: 1px dashed var(--bp-border-strong);
  border-radius: 2px;
  margin: 2rem 0;
  overflow: hidden;
}

.bp-demo-header {
  border-bottom: 1px dashed var(--bp-border-strong);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--bp-muted);
  padding: 0.5rem 1rem;
  font-size: 0.7rem;
  font-weight: 600;
}

.bp-demo-content {
  padding: 24px;
}

.bp-demo-footer {
  border-top: 1px dashed var(--bp-border-strong);
  padding: 0.5rem 1rem;
}

/* --- Blog footer CTA ----------------------------------------------------- */

.blog-footer-cta {
  max-width: 1000px;
  margin: 0 auto;
}

.blog-footer-cta__divider {
  border: none;
  border-top: 1px dashed var(--bp-border);
  height: 0;
  margin-bottom: 2.5rem;
}

.blog-footer-cta__cta {
  margin-bottom: 2.5rem;
}

.blog-footer-cta__cta-heading {
  color: var(--bp-text);
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.blog-footer-cta__cta-body {
  color: var(--bp-muted);
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  line-height: 1.7;
}

.blog-footer-cta__email {
  color: var(--bp-blue);
  border-bottom: 1px solid var(--bp-blue);
  font-size: 0.78rem;
  text-decoration: none;
  transition: opacity 0.15s;
}

.blog-footer-cta__email:hover {
  opacity: 0.75;
}

.blog-footer-cta__similar {
  margin-bottom: 2.5rem;
}

.blog-footer-cta__section-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bp-muted);
  margin: 0 0 1rem;
  font-size: 0.7rem;
  font-weight: 700;
}

.blog-footer-cta__list {
  display: flex;
  flex-direction: column;
}

.blog-footer-cta__post-row {
  border-bottom: 1px dashed var(--bp-border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.65rem 0;
  text-decoration: none;
  transition: color 0.15s;
}

.blog-footer-cta__post-row:first-child {
  border-top: 1px dashed var(--bp-border);
}

.blog-footer-cta__post-row:hover .blog-footer-cta__post-title {
  color: var(--bp-blue);
}

.blog-footer-cta__post-title {
  color: var(--bp-text);
  min-width: 0;
  font-size: 0.78rem;
  font-weight: 500;
  transition: color 0.15s;
}

.blog-footer-cta__post-tags {
  flex-shrink: 0;
  display: flex;
  gap: 0.3rem;
}

.blog-footer-cta__tag {
  border: 1px solid var(--bp-border);
  color: var(--bp-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
  border-radius: 2px;
  padding: 0.1rem 0.35rem;
  font-size: 0.55rem;
}

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

.footer-info {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px dashed var(--bp-border);
  font-size: 0.72rem;
  color: var(--bp-muted);
}

/* --- Reading progress bar ------------------------------------------------ */

.reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 9999;
  pointer-events: none;
  background: transparent;
}

.reading-progress-bar {
  background: var(--bp-blue);
  height: 100%;
  width: 0;
  transition: width 80ms linear;
}

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

@media (max-width: 640px) {
  .stat-cards {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .bp-corner-marks {
    display: none;
  }

  .hero h1 {
    font-size: 1.4rem;
  }

  .bp-demo-content {
    padding: 16px;
  }

  .blog-footer-cta__post-row {
    flex-direction: column;
    gap: 0.35rem;
  }
}

@media (min-width: 768px) {
  .bp-content h1 {
    font-size: 1.75rem;
  }

  .bp-header {
    padding: 2.5rem 0 3rem;
  }
}

/* --- Syntax highlighting (Prism.js) -------------------------------------- */

/* Override Prism defaults to match blueprint palette */
code[class*="language-"],
pre[class*="language-"] {
  color: var(--bp-text);
  text-shadow: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.6;
  tab-size: 4;
  hyphens: none;
}

.bp-content pre[class*="language-"] {
  border: 1px solid var(--bp-border-light);
  background: #f8fafc;
  border-radius: 2px;
  margin: 1.25rem 0;
  padding: 1rem;
  overflow-x: auto;
}

.bp-content pre[class*="language-"] code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: inherit;
}

/* Light mode token colors */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #94a3b8;
  font-style: italic;
}

.token.punctuation {
  color: #64748b;
}

.token.namespace {
  opacity: 0.7;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #dc2626;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #16a34a;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string {
  color: #64748b;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #2563eb;
}

.token.function,
.token.class-name {
  color: #9333ea;
}

.token.regex,
.token.important,
.token.variable {
  color: #d97706;
}

.token.important,
.token.bold {
  font-weight: 700;
}

.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}

/* Language label on code blocks */
pre[class*="language-"]::before {
  content: attr(data-lang);
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--bp-muted);
  font-size: 0.6rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--bp-border-light);
}

pre[class*="language-"]:not([data-lang])::before {
  display: none;
}

/* --- Dark mode ----------------------------------------------------------- */

@media (prefers-color-scheme: dark) {
  :root {
    --bp-blue: #60a5fa;
    --bp-blue-light: #93c5fd;
    --bp-blue-bg: rgba(96, 165, 250, 0.12);
    --bp-blue-bg-soft: rgba(96, 165, 250, 0.06);
    --bp-blue-accent: rgba(96, 165, 250, 0.15);
    --bp-text: #cbd5e1;
    --bp-text-label: #94a3b8;
    --bp-muted: #64748b;
    --bp-border: #334155;
    --bp-border-strong: #475569;
    --bp-border-light: #334155;
    --background: #0f172a;
    --foreground: #e2e8f0;
  }

  .bp-grid-bg {
    background-image: radial-gradient(
      circle,
      rgba(96, 165, 250, 0.08) 1px,
      transparent 1px
    );
  }

  .stat-card,
  .product-card {
    background: #1e293b;
  }

  .info-box {
    background: rgba(96, 165, 250, 0.04);
  }

  .bp-content pre {
    background: #1e293b;
  }

  .bp-content code {
    background: rgba(96, 165, 250, 0.1);
    border-color: rgba(96, 165, 250, 0.2);
  }

  .bp-content pre code {
    background: transparent;
    border: none;
  }

  .bp-content img {
    border-color: #334155;
  }

  .bp-demo-card {
    background: #1e293b;
  }

  /* Syntax highlighting dark mode */
  .bp-content pre[class*="language-"] {
    background: #1e293b;
  }

  .token.comment,
  .token.prolog,
  .token.doctype,
  .token.cdata {
    color: #64748b;
  }

  .token.punctuation {
    color: #94a3b8;
  }

  .token.property,
  .token.tag,
  .token.boolean,
  .token.number,
  .token.constant,
  .token.symbol,
  .token.deleted {
    color: #f87171;
  }

  .token.selector,
  .token.attr-name,
  .token.string,
  .token.char,
  .token.builtin,
  .token.inserted {
    color: #4ade80;
  }

  .token.operator,
  .token.entity,
  .token.url,
  .language-css .token.string {
    color: #94a3b8;
  }

  .token.atrule,
  .token.attr-value,
  .token.keyword {
    color: #60a5fa;
  }

  .token.function,
  .token.class-name {
    color: #c084fc;
  }

  .token.regex,
  .token.important,
  .token.variable {
    color: #fbbf24;
  }
}