/* ==========================================================================
   cybersteveharris.com — stylesheet
   Dark by default, light theme available via the header toggle or OS setting.
   ========================================================================== */

:root {
  --bg: #0a0e14;
  --bg-alt: #0f151e;
  --surface: #121a25;
  --surface-2: #17212e;
  --border: #223044;
  --border-soft: #1a2534;
  --text: #e8eef6;
  --text-muted: #8fa3ba;
  --accent: #2ee6c5;
  --accent-strong: #14c7a6;
  --accent-ink: #04231e;
  --accent-soft: rgba(46, 230, 197, 0.12);
  --amber: #f5b661;
  --shadow: 0 20px 50px -25px rgba(0, 0, 0, 0.9);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 14px;
  --radius-sm: 8px;
  --container: 1120px;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme='dark']) {
    --bg: #f6f8fb;
    --bg-alt: #eef2f7;
    --surface: #ffffff;
    --surface-2: #f2f5f9;
    --border: #dbe3ec;
    --border-soft: #e6ecf3;
    --text: #0d1622;
    --text-muted: #5a6b80;
    --accent: #0d9488;
    --accent-strong: #0b7d73;
    --accent-ink: #ffffff;
    --accent-soft: rgba(13, 148, 136, 0.1);
    --amber: #b4700f;
    --shadow: 0 18px 40px -28px rgba(15, 34, 58, 0.45);
  }
}

:root[data-theme='light'] {
  --bg: #f6f8fb;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --surface-2: #f2f5f9;
  --border: #dbe3ec;
  --border-soft: #e6ecf3;
  --text: #0d1622;
  --text-muted: #5a6b80;
  --accent: #0d9488;
  --accent-strong: #0b7d73;
  --accent-ink: #ffffff;
  --accent-soft: rgba(13, 148, 136, 0.1);
  --amber: #b4700f;
  --shadow: 0 18px 40px -28px rgba(15, 34, 58, 0.45);
}

/* --------------------------------------------------------------- reset -- */

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
  font-weight: 650;
}

h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.3vw, 2.05rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1.1em; }

code, pre { font-family: var(--mono); font-size: 0.9em; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.5rem;
}
.container--narrow { max-width: 760px; }
.muted { color: var(--text-muted); }
.center { text-align: center; }

/* -------------------------------------------------------------- header -- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-weight: 650;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; color: var(--accent); }

.brand__mark {
  font-family: var(--mono);
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 6px;
  padding: 0.1rem 0.4rem;
  font-size: 0.85rem;
}

.nav {
  display: flex;
  gap: 1.6rem;
  margin-left: auto;
  font-size: 0.94rem;
}
.nav a { color: var(--text-muted); font-weight: 500; }
.nav a:hover { color: var(--text); text-decoration: none; }

.site-header__actions { display: flex; gap: 0.5rem; align-items: center; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }

.icon-moon { display: none; }
:root[data-theme='light'] .icon-moon { display: block; }
:root[data-theme='light'] .icon-sun { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme='dark']) .icon-moon { display: block; }
  :root:not([data-theme='dark']) .icon-sun { display: none; }
}

.nav-toggle { display: none; }

@media (max-width: 800px) {
  .nav {
    position: absolute;
    inset: 64px 0 auto;
    flex-direction: column;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1.5rem 1rem;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 0.7rem 0; border-bottom: 1px solid var(--border-soft); }
  .nav-toggle { display: inline-grid; }
  .site-header__actions { margin-left: auto; }
}

/* ---------------------------------------------------------------- hero -- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-soft);
  background: linear-gradient(to bottom, var(--bg-alt), var(--bg));
}

/* Faint vertical rule grid, fading out towards the bottom of the hero. */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    color-mix(in srgb, var(--border) 70%, transparent) 0 1px,
    transparent 1px 72px
  );
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), transparent 75%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), transparent 75%);
  pointer-events: none;
}

.hero__glow {
  position: absolute;
  top: -180px;
  left: 50%;
  width: 720px;
  height: 460px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, var(--accent-soft), transparent);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  padding: clamp(3.5rem, 8vw, 6.5rem) 1.5rem clamp(3rem, 6vw, 4.5rem);
  max-width: 820px;
  text-align: center;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero__lede {
  font-size: 1.12rem;
  color: var(--text-muted);
  max-width: 58ch;
  margin-inline: auto;
}

.hero__actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 2rem 0 0;
}

.hero__stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin: 3rem 0 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border-soft);
}
@media (max-width: 560px) {
  .hero__stats { gap: 1.25rem 2rem; }
  .hero__stats > div { flex: 1 1 40%; }
}
.hero__stats dt {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.hero__stats dd { margin: 0.35rem 0 0; font-weight: 600; }

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: var(--accent-strong); }

.btn--ghost { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.link-arrow { font-weight: 600; font-size: 0.95rem; white-space: nowrap; }
.link-arrow::after { content: ' \2192'; }

.link-back {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.link-back:hover { color: var(--accent); text-decoration: none; }

/* ------------------------------------------------------------ sections -- */

.section { padding: clamp(3rem, 6vw, 4.5rem) 0; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--border-soft); }
.section--tall { padding: clamp(5rem, 12vw, 8rem) 0; }

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}
.section__head h2 { margin: 0; }

.page-header {
  padding: clamp(2.75rem, 6vw, 4.25rem) 0 0;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-alt);
  padding-bottom: clamp(2rem, 4vw, 3rem);
}
.page-header__lede {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 62ch;
  margin-bottom: 0;
}
.page-header--post h1 { max-width: 22ch; }

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

.grid { display: grid; gap: 1.25rem; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.card:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); transform: translateY(-2px); }

.post-card h3 { margin: 0.5rem 0 0.55rem; }
.post-card h3 a { color: var(--text); }
.post-card h3 a:hover { color: var(--accent); text-decoration: none; }
.post-card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 1rem; }

.post-card__meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}
.dot { width: 3px; height: 3px; border-radius: 50%; background: currentColor; }

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
}

.cta {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(2rem, 5vw, 3rem);
  text-align: center;
  box-shadow: var(--shadow);
}
.cta p { color: var(--text-muted); max-width: 56ch; margin-inline: auto; }
.cta .btn { margin-top: 0.5rem; }

/* --------------------------------------------------------------- prose -- */

.prose { font-size: 1.02rem; }
.prose > :first-child { margin-top: 0; }
.prose h2 { margin-top: 2.5rem; }
.prose h3 { margin-top: 2rem; }
.prose ul, .prose ol { padding-left: 1.25rem; margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.45em; }
.prose li::marker { color: var(--accent); }

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
}

.prose code {
  background: var(--surface-2);
  border: 1px solid var(--border-soft);
  border-radius: 5px;
  padding: 0.12em 0.4em;
  color: var(--accent);
}

.prose pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  line-height: 1.55;
}
.prose pre code { background: none; border: 0; padding: 0; color: var(--text); }

.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

.table-wrap { overflow-x: auto; margin: 1.5rem 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.94rem; }
.prose th, .prose td {
  text-align: left;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
.prose th {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Cards rendered from markdown (used on Resources / Services pages) */
.prose .stack { display: grid; gap: 1rem; margin: 1.5rem 0 2rem; }
.prose .stack .card { padding: 1.25rem 1.4rem; }
.prose .stack .card h3 { margin-top: 0; margin-bottom: 0.35rem; font-size: 1.05rem; }
.prose .stack .card p { margin-bottom: 0; color: var(--text-muted); font-size: 0.95rem; }

/* ------------------------------------------------------------ post nav -- */

.post-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.post-nav__item {
  flex: 1 1 240px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  color: var(--text);
}
.post-nav__item:hover { border-color: var(--accent); text-decoration: none; }
.post-nav__item span {
  display: block;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}
.post-nav__item--right { text-align: right; }

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

.site-footer {
  border-top: 1px solid var(--border-soft);
  background: var(--bg-alt);
  padding: 2.5rem 0;
  font-size: 0.92rem;
}
.site-footer__inner { display: grid; gap: 1.5rem; }
.site-footer__brand { display: flex; align-items: flex-start; gap: 0.75rem; }
.site-footer__brand p { margin: 0.1rem 0 0; font-size: 0.88rem; }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.site-footer__nav a { color: var(--text-muted); }
.site-footer__nav a:hover { color: var(--accent); }
.site-footer__legal { margin: 0; font-size: 0.85rem; }

@media (min-width: 800px) {
  .site-footer__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
  .site-footer__legal { grid-column: 1 / -1; }
}

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