/* ============================================================
   DataEngineX — main.css
   Brand: Blue-grey #37474f primary · Teal #00897b accent
   Mobile-first · No external dependencies
   ============================================================ */

/* ── Custom properties ──────────────────────────────────────── */
:root {
  --color-primary:      #37474f;
  --color-primary-dark: #263238;
  --color-accent:       #00897b;
  --color-accent-dark:  #00695c;
  --color-accent-light: #e0f2f1;
  --color-dark:         #263238;
  --color-text:         #212121;
  --color-text-muted:   #607d8b;
  --color-bg:           #ffffff;
  --color-bg-light:     #eceff1;
  --color-bg-code:      #1e272e;
  --color-border:       #cfd8dc;

  --font-sans:  system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:  "JetBrains Mono", "Fira Code", "Cascadia Code", ui-monospace, "Courier New", monospace;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.12), 0 4px 8px rgba(0,0,0,.06);

  --transition: 160ms ease;

  --container-width: 1160px;
  --container-pad:   1.25rem;
}

/* ── Reset / base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul, ol { list-style: none; }

code, kbd, pre {
  font-family: var(--font-mono);
  font-size: .875em;
}

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

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.35rem;
  border-radius: var(--radius-md);
  font-size: .9375rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0,137,123,.35);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-light);
  text-decoration: none;
}

.btn-secondary--dark {
  color: var(--color-bg);
  border-color: rgba(255,255,255,.4);
}
.btn-secondary--dark:hover {
  border-color: #fff;
  background: rgba(255,255,255,.1);
}

/* ── Badges ─────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: .2rem .6rem;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  background: var(--color-bg-light);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}
.badge--teal {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
  border-color: #b2dfdb;
}

/* ── Section headings ───────────────────────────────────────── */
.section-headline {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  text-align: center;
  margin-bottom: .75rem;
}
.section-sub {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: 3rem;
}

/* ── Code window chrome ─────────────────────────────────────── */
.code-window {
  background: var(--color-bg-code);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.code-window--sm { border-radius: var(--radius-md); }

.code-window-bar {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .65rem 1rem;
  background: #2b3840;
  border-bottom: 1px solid #37474f;
}
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot--red    { background: #ff5f57; }
.dot--yellow { background: #ffbd2e; }
.dot--green  { background: #28c940; }

.code-window-title {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: #90a4ae;
  margin-left: .5rem;
}

.code-block {
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: #cfd8dc;
  tab-size: 2;
}

/* YAML syntax colours */
.code-block .ky { color: #80cbc4; }   /* key */
.code-block .s  { color: #a5d6a7; }   /* string value */
.code-block .n  { color: #ffcc80; }   /* number */
.code-block .b  { color: #ce93d8; }   /* bool / keyword */
.code-block .p  { color: #90a4ae; }   /* punctuation */
.code-block .c  { color: #546e7a; font-style: italic; } /* comment */

/* ══════════════════════════════════════════════════════════════
   HEADER / NAV
══════════════════════════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 60px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -.02em;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-d  { color: var(--color-primary); }
.nav-logo-ex { color: var(--color-accent); }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px; height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-links {
  display: none;
  position: absolute;
  top: 60px;
  left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: 1rem var(--container-pad);
  flex-direction: column;
  gap: .25rem;
}
.nav-links.is-open { display: flex; }

.nav-link {
  display: block;
  padding: .5rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}
.nav-link:hover { background: var(--color-bg-light); text-decoration: none; }

.nav-link--cta {
  background: var(--color-accent);
  color: #fff !important;
  font-weight: 600;
  border-radius: var(--radius-md);
  padding: .45rem 1rem;
}
.nav-link--cta:hover {
  background: var(--color-accent-dark);
}

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .nav-links {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    background: none;
    border: none;
    padding: 0;
    margin-left: auto;
    gap: .25rem;
  }
}

/* ══════════════════════════════════════════════════════════════
   HERO
══════════════════════════════════════════════════════════════ */
.hero {
  padding: 5rem 0 4rem;
  background: linear-gradient(160deg, #f8fafb 0%, var(--color-bg) 60%);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-eyebrow {
  display: flex;
  gap: .5rem;
  margin-bottom: 1.25rem;
}

.hero-headline {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.03em;
  color: var(--color-primary-dark);
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1.75rem;
}

.hero-install {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
  font-size: .9rem;
}
.install-cmd {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .3rem .7rem;
  font-size: .875rem;
  color: var(--color-accent-dark);
  user-select: all;
}
.install-hint {
  color: var(--color-text-muted);
  font-size: .875rem;
}

@media (min-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

/* ══════════════════════════════════════════════════════════════
   PROBLEM STRIP
══════════════════════════════════════════════════════════════ */
.problem-strip {
  background: var(--color-dark);
  color: #fff;
  padding: 4.5rem 0;
}

.problem-inner {
  text-align: center;
}

.problem-headline {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  color: #fff;
  margin-bottom: 2.5rem;
}

.problem-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem 4rem;
  margin-bottom: 2.5rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stat-value {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  color: var(--color-accent);
  line-height: 1;
  letter-spacing: -.03em;
}
.stat-label {
  font-size: .9375rem;
  color: #90a4ae;
  margin-top: .35rem;
  font-weight: 500;
}

.problem-sub {
  font-size: 1rem;
  color: #b0bec5;
  max-width: 60ch;
  margin-inline: auto;
  line-height: 1.75;
}
.problem-sub strong { color: #fff; }

/* ══════════════════════════════════════════════════════════════
   FEATURES GRID
══════════════════════════════════════════════════════════════ */
.features {
  padding: 5rem 0;
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 600px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .features-grid { grid-template-columns: repeat(3, 1fr); }
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #b2dfdb;
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px; height: 48px;
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--color-accent-dark);
  flex-shrink: 0;
}

.feature-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: .5rem;
}
.feature-desc {
  font-size: .9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ══════════════════════════════════════════════════════════════
   CODE DEMO
══════════════════════════════════════════════════════════════ */
.code-demo {
  background: var(--color-bg-light);
  padding: 5rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.code-demo-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}

@media (min-width: 960px) {
  .code-demo-inner {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
  }
}

.code-demo-text h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 1rem;
}
.code-demo-text p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}
.code-demo-text code {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .1rem .4rem;
  color: var(--color-accent-dark);
  font-size: .875em;
}

.demo-benefits {
  margin: 1.5rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: .65rem;
}
.demo-benefits li {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  font-size: .9375rem;
  color: var(--color-text);
  line-height: 1.5;
}
.demo-benefits li svg {
  flex-shrink: 0;
  color: var(--color-accent);
  margin-top: .1rem;
}
.demo-benefits li code {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .1rem .35rem;
  font-size: .8125rem;
  color: var(--color-accent-dark);
}

/* ══════════════════════════════════════════════════════════════
   ECOSYSTEM
══════════════════════════════════════════════════════════════ */
.ecosystem {
  padding: 5rem 0;
  background: var(--color-bg);
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .ecosystem-grid { grid-template-columns: repeat(3, 1fr); }
}

.eco-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  background: var(--color-bg);
  transition: box-shadow var(--transition), transform var(--transition);
}
.eco-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.eco-card--primary {
  border-color: #b2dfdb;
  background: linear-gradient(135deg, #f8fffe 0%, #e0f2f1 100%);
}

.eco-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.eco-icon {
  width: 44px; height: 44px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}
.eco-card--primary .eco-icon {
  background: #fff;
  border-color: #b2dfdb;
}
.eco-version {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--color-accent-dark);
  background: var(--color-accent-light);
  border: 1px solid #b2dfdb;
  padding: .15rem .55rem;
  border-radius: 999px;
}
.eco-badge {
  font-size: .75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  padding: .15rem .55rem;
  border-radius: 999px;
}

.eco-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: .25rem;
}
.eco-package {
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--color-text-muted);
  margin-bottom: .75rem;
}
.eco-package code {
  color: var(--color-accent-dark);
}
.eco-desc {
  font-size: .9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}
.eco-link {
  font-size: .875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}
.eco-link:hover { color: var(--color-accent-dark); text-decoration: underline; }

/* ══════════════════════════════════════════════════════════════
   INSTALL STRIP
══════════════════════════════════════════════════════════════ */
.install-strip {
  background: var(--color-primary-dark);
  color: #fff;
  padding: 5rem 0;
}

.install-inner {
  text-align: center;
}
.install-inner h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: .75rem;
  color: #fff;
}
.install-sub {
  font-size: 1.0625rem;
  color: #90a4ae;
  margin-bottom: 2.5rem;
}

.install-blocks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 740px;
  margin-inline: auto;
  margin-bottom: 2.5rem;
  text-align: left;
}
@media (min-width: 680px) {
  .install-blocks { grid-template-columns: 1fr 1.6fr; }
}

.install-group {}
.install-label {
  display: block;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #80cbc4;
  margin-bottom: .5rem;
}

.install-ctas {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .75rem;
}

/* ══════════════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════════════ */
.site-footer {
  background: var(--color-dark);
  color: #90a4ae;
  padding: 3rem 0 2rem;
  border-top: 1px solid #37474f;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (min-width: 640px) {
  .footer-inner {
    grid-template-columns: 1fr auto auto;
    align-items: center;
  }
}

.footer-brand .nav-logo-d  { color: #b0bec5; }
.footer-brand .nav-logo-ex { color: var(--color-accent); }
.footer-brand .nav-logo-d,
.footer-brand .nav-logo-ex {
  font-size: 1.125rem;
  font-weight: 800;
}
.footer-tagline {
  font-size: .8125rem;
  color: #546e7a;
  margin-top: .3rem;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem .75rem;
}
.footer-nav a {
  font-size: .875rem;
  color: #78909c;
  transition: color var(--transition);
}
.footer-nav a:hover { color: #fff; text-decoration: none; }

.footer-copy {
  font-size: .8125rem;
  color: #546e7a;
}

/* ══════════════════════════════════════════════════════════════
   PAGE TEMPLATE (prose)
══════════════════════════════════════════════════════════════ */
.page-wrapper {
  padding: 4rem 0 5rem;
}

.prose {
  max-width: 72ch;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.prose-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}
.prose-headline {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--color-primary-dark);
  letter-spacing: -.025em;
  line-height: 1.2;
  margin-bottom: .5rem;
}
.prose-description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Prose content styles */
.prose-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin: 2.5rem 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--color-border);
}
.prose-body h3 {
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 2rem 0 .75rem;
}
.prose-body p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}
.prose-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.prose-body a:hover { color: var(--color-accent-dark); }

.prose-body ul,
.prose-body ol {
  margin: 0 0 1.25rem 1.5rem;
}
.prose-body ul { list-style: disc; }
.prose-body ol { list-style: decimal; }
.prose-body li {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: .35rem;
  color: var(--color-text);
}

.prose-body strong { font-weight: 700; color: var(--color-primary-dark); }
.prose-body em { font-style: italic; }

.prose-body code {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .15rem .4rem;
  font-size: .875em;
  color: var(--color-accent-dark);
}

.prose-body pre {
  background: var(--color-bg-code);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
}
.prose-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #cfd8dc;
  font-size: .875rem;
  line-height: 1.7;
}

/* Tables */
.prose-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9375rem;
  margin: 1.5rem 0;
}
.prose-body th {
  background: var(--color-bg-light);
  font-weight: 700;
  color: var(--color-primary-dark);
  text-align: left;
  padding: .65rem 1rem;
  border: 1px solid var(--color-border);
  font-size: .875rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.prose-body td {
  padding: .6rem 1rem;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  line-height: 1.5;
}
.prose-body tr:nth-child(even) td {
  background: var(--color-bg-light);
}
.prose-body td code {
  font-size: .8125rem;
}

/* Horizontal rule */
.prose-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}

/* Blockquote */
.prose-body blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 1.5rem 0;
  padding: .75rem 1.25rem;
  background: var(--color-accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-primary-dark);
  font-style: italic;
}

/* ══════════════════════════════════════════════════════════════
   UTILITY / HELPERS
══════════════════════════════════════════════════════════════ */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── Print ───────────────────────────────────────────────────── */
@media print {
  .site-header, .site-footer, .hero-ctas, .install-strip { display: none; }
  body { font-size: 12pt; color: #000; }
  a::after { content: " (" attr(href) ")"; font-size: .8em; }
}