/* ==========================================================================
   Dan Burgett — Dev Blog
   Custom theme. No frameworks. CSS variables drive light/dark.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;

  --maxw: 760px;
  --maxw-wide: 1080px;
  --radius: 16px;
  --radius-sm: 10px;
  --pad: clamp(1.1rem, 4vw, 2rem);

  --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.18);
  --shadow-md: 0 12px 30px -12px rgba(2, 6, 23, 0.45);
  --shadow-lg: 0 30px 60px -20px rgba(2, 6, 23, 0.55);

  --ring: 0 0 0 1px var(--border);
  --transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark (default) */
:root,
[data-theme="dark"] {
  --bg: #0a0e16;
  --bg-grad-1: rgba(99, 102, 241, 0.16);
  --bg-grad-2: rgba(34, 211, 238, 0.12);
  --surface: #121826;
  --surface-2: #161d2e;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #e7eaf1;
  --heading: #f8fafc;
  --muted: #97a1b2;
  --accent: #818cf8;
  --accent-2: #2dd4bf;
  --accent-ink: #0a0e16;
  --code-bg: #0f1524;
  --inline-code: #fca5a5;
  --inline-code-bg: rgba(248, 113, 113, 0.12);
  --nav-bg: rgba(10, 14, 22, 0.72);
}

/* Light */
[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-grad-1: rgba(99, 102, 241, 0.12);
  --bg-grad-2: rgba(13, 148, 136, 0.1);
  --surface: #ffffff;
  --surface-2: #ffffff;
  --border: rgba(15, 23, 42, 0.09);
  --border-strong: rgba(15, 23, 42, 0.16);
  --text: #2b3445;
  --heading: #0f172a;
  --muted: #5b6575;
  --accent: #4f46e5;
  --accent-2: #0d9488;
  --accent-ink: #ffffff;
  --code-bg: #0f1524;
  --inline-code: #be123c;
  --inline-code-bg: rgba(190, 18, 60, 0.08);
  --nav-bg: rgba(246, 247, 251, 0.75);
}

/* ---------- Base ---------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  background-image: radial-gradient(
      60rem 60rem at 110% -10%,
      var(--bg-grad-1),
      transparent 55%
    ),
    radial-gradient(50rem 50rem at -10% 0%, var(--bg-grad-2), transparent 50%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  color: var(--heading);
  line-height: 1.2;
  font-weight: 750;
  letter-spacing: -0.02em;
  margin: 2rem 0 0.75rem;
}

h1 {
  font-size: clamp(1.9rem, 5vw, 2.6rem);
}
h2 {
  font-size: clamp(1.45rem, 3.5vw, 1.85rem);
}
h3 {
  font-size: 1.3rem;
}

p {
  margin: 0 0 1.1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--accent-2);
}

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

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.container-wide {
  max-width: var(--maxw-wide);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
  padding-block: clamp(2rem, 6vw, 4rem);
}

.gradient-text {
  background: linear-gradient(115deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 0.6rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border-radius: 999px;
  font-weight: 650;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.btn svg {
  width: 1.05em;
  height: 1.05em;
}
.btn-primary {
  background: linear-gradient(115deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  box-shadow: var(--shadow-md);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--accent-ink);
}
.btn-ghost {
  background: var(--surface);
  color: var(--heading);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--heading);
}

/* ---------- Navbar ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.site-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 64px;
  max-width: var(--maxw-wide);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--heading);
  font-size: 1.05rem;
}
.brand:hover {
  color: var(--heading);
}
.brand-mark {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.94rem;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover {
  color: var(--heading);
  background: var(--surface);
}
.nav-links a.is-active {
  color: var(--heading);
  background: var(--surface);
  box-shadow: var(--ring);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition),
    transform var(--transition);
}
.icon-btn:hover {
  color: var(--accent-2);
  border-color: var(--border-strong);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
}
.theme-toggle .moon {
  display: none;
}
[data-theme="light"] .theme-toggle .moon {
  display: block;
}
[data-theme="light"] .theme-toggle .sun {
  display: none;
}

.nav-toggle {
  display: none;
}

/* ---------- Mobile nav ---------- */
@media (max-width: 720px) {
  .nav-toggle {
    display: grid;
  }
  .nav-links {
    position: fixed;
    inset: 64px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    padding: 1rem var(--pad) 1.4rem;
    background: var(--nav-bg);
    backdrop-filter: saturate(160%) blur(14px);
    -webkit-backdrop-filter: saturate(160%) blur(14px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-130%);
    transition: transform 240ms ease;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .nav-links a {
    padding: 0.7rem 0.85rem;
    font-size: 1rem;
  }
}

/* ---------- Hero (home) ---------- */
.hero {
  text-align: center;
  padding-block: clamp(1.5rem, 5vw, 3rem) clamp(2rem, 6vw, 3.5rem);
}
.hero-avatar {
  --size: 132px;
  width: var(--size);
  height: var(--size);
  margin: 0 auto 1.6rem;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: var(--shadow-lg);
}
.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--bg);
  display: block;
}
.hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2.1rem, 6vw, 3.2rem);
}
.hero .lead {
  max-width: 38ch;
  margin: 0 auto 1.8rem;
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--muted);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* ---------- Section headers ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.section-head h2 {
  margin: 0;
}
.section-head a {
  font-weight: 650;
  font-size: 0.95rem;
  white-space: nowrap;
}

/* ---------- Post cards / list ---------- */
.card-grid {
  display: grid;
  gap: 1.1rem;
}
@media (min-width: 720px) {
  .card-grid.cols-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition),
    box-shadow var(--transition);
  overflow: hidden;
}
.post-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(115deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity var(--transition);
}
.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.post-card:hover::before {
  opacity: 1;
}
.post-card .post-date {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-2);
  letter-spacing: 0.02em;
}
.post-card h3 {
  margin: 0;
  font-size: 1.25rem;
}
.post-card h3 a {
  color: var(--heading);
}
.post-card h3 a:hover {
  color: var(--accent);
}
.post-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}
.post-card .stretched-link::after {
  content: "";
  position: absolute;
  inset: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.2rem;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  position: relative;
  z-index: 1;
  transition: color var(--transition), border-color var(--transition);
}
.tag:hover {
  color: var(--accent-2);
  border-color: var(--border-strong);
}

/* ---------- Page header ---------- */
.page-header {
  margin-bottom: 2rem;
}
.page-header h1 {
  margin-top: 0;
}
.page-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 1rem;
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.5rem;
}
.page-meta .dot {
  opacity: 0.5;
}

/* ---------- About page ---------- */
.about-head {
  display: flex;
  align-items: center;
  gap: clamp(1.5rem, 5vw, 2.75rem);
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.about-photo {
  flex: 0 0 auto;
  width: clamp(160px, 40vw, 220px);
  border-radius: 22px;
  padding: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: var(--shadow-lg);
}
.about-photo img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 18px;
  border: 3px solid var(--bg);
  object-fit: cover;
}
.about-intro {
  flex: 1 1 280px;
}
.about-intro h1 {
  margin: 0.3rem 0 0.5rem;
}
.about-loc {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
}
.about-loc svg {
  width: 16px;
  height: 16px;
  color: var(--accent-2);
}
.about-certs {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.about-certs h2 {
  margin-top: 0;
}
.about-certs .tag svg {
  width: 14px;
  height: 14px;
  color: var(--accent-2);
}

/* ---------- Article / prose ---------- */
.prose {
  font-size: 1.075rem;
}
.prose > :first-child {
  margin-top: 0;
}
.prose h2,
.prose h3 {
  scroll-margin-top: 84px;
}
.prose ul,
.prose ol {
  padding-left: 1.4rem;
  margin: 0 0 1.2rem;
}
.prose li {
  margin-bottom: 0.4rem;
}
.prose img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-block: 1rem;
}
.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.4rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
}
.prose a:hover {
  text-decoration-color: var(--accent-2);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.prose th,
.prose td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}
.prose th {
  background: var(--surface);
  color: var(--heading);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}
.prose :not(pre) > code {
  color: var(--inline-code);
  background: var(--inline-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 6px;
}
pre {
  background: var(--code-bg) !important;
  color: #e7eaf1;
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  overflow-x: auto;
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}
pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* ---------- Tags index ---------- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.tag-cloud .tag {
  font-size: 0.92rem;
  padding: 0.45rem 1rem;
}

/* ---------- Work With Me page ---------- */
.cta-hero {
  text-align: center;
  padding: clamp(1rem, 4vw, 2rem) 0 clamp(1.5rem, 5vw, 2.5rem);
}
.brand-logo {
  width: min(340px, 78vw);
  margin: 0 auto 1.6rem;
  color: var(--heading);
}
.brand-logo svg {
  width: 100%;
  height: auto;
  display: block;
}

.cta-hero .lead {
  max-width: 52ch;
  margin: 0 auto 1.8rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2.5vw, 1.22rem);
}

.service-grid {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: 1fr;
  margin: 1rem 0 2.5rem;
}
@media (min-width: 680px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.service-card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition),
    box-shadow var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.service-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  border-radius: 13px;
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: var(--shadow-sm);
}
.service-icon svg {
  width: 24px;
  height: 24px;
}
.service-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}
.service-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.97rem;
}

.cta-panel {
  text-align: center;
  padding: clamp(2rem, 6vw, 3.2rem);
  border-radius: var(--radius);
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--accent) 16%, var(--surface)),
    color-mix(in srgb, var(--accent-2) 14%, var(--surface))
  );
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-md);
}
.cta-panel h2 {
  margin-top: 0;
}
.cta-panel p {
  color: var(--muted);
  max-width: 46ch;
  margin-inline: auto;
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2.5rem;
  list-style: none;
  padding: 0;
}
.pagination a,
.pagination span {
  display: grid;
  place-items: center;
  min-width: 42px;
  height: 42px;
  padding-inline: 0.6rem;
  border-radius: 11px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
}
.pagination .active span {
  background: linear-gradient(115deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  border-color: transparent;
}
.pagination .disabled span {
  opacity: 0.4;
}

/* ---------- Footer ---------- */
.site-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding-block: 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw-wide);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}
.footer-links a {
  color: var(--muted);
}
.footer-links a:hover {
  color: var(--accent-2);
}

/* ---------- Misc ---------- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
.back-link:hover {
  color: var(--accent-2);
}
.back-link svg {
  width: 16px;
  height: 16px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}