/* =====================================================================
   Datus marketing-site design system
   Developer-friendly, terminal/CLI aesthetic.
   Brand: #402DF3 (indigo) on deep navy #0B1542.
   Self-contained plain CSS — shared by every MPA page and the static blog.
   ===================================================================== */

:root {
  /* Brand */
  --brand: #402df3;
  --brand-bright: #6b5cff;
  --brand-soft: rgba(64, 45, 243, 0.16);
  --brand-glow: rgba(107, 92, 255, 0.35);
  --brand-ink: #0b1542; /* deep navy */

  /* Surfaces */
  --bg: #070b1f;
  --bg-2: #0b1230;
  --panel: rgba(17, 24, 56, 0.6);
  --panel-solid: #0e1638;
  --panel-2: rgba(13, 20, 52, 0.85);
  --line: rgba(124, 137, 196, 0.16);
  --line-strong: rgba(124, 137, 196, 0.28);

  /* Text */
  --ink: #eef1ff;
  --ink-dim: #c2c8ec;
  --ink-muted: #8a93c4;
  --ink-faint: #5e6796;

  /* Terminal accents */
  --term-green: #5be3a7;
  --term-cyan: #57d4f0;
  --term-amber: #ffc24b;
  --term-pink: #f78fce;

  /* Radii / shadow */
  --r-sm: 8px;
  --r: 12px;
  --r-lg: 18px;
  --r-xl: 26px;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.7);
  --shadow-brand: 0 20px 50px -20px rgba(64, 45, 243, 0.45);

  /* Type */
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SF Mono", "Menlo",
    "Cascadia Code", "Fira Code", monospace;

  /* Layout */
  --maxw: 1180px;
  --nav-h: 64px;
}

/* ----------------------------- base ----------------------------- */
/* Minimal reset — the static blog pages load only this stylesheet (no Tailwind
   preflight), so normalize body margin and native control styling here. */
html,
body {
  margin: 0;
  padding: 0;
}

.site-root {
  background:
    radial-gradient(1100px 600px at 78% -8%, rgba(64, 45, 243, 0.22), transparent 60%),
    radial-gradient(900px 520px at 8% 4%, rgba(11, 21, 66, 0.9), transparent 55%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
}

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

.site-root a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--brand-bright);
  background: var(--brand-soft);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 12px;
}

.section {
  padding-block: clamp(64px, 8vw, 116px);
  position: relative;
}

.section-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.h2 {
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 14px 0 0;
}

.lead {
  color: var(--ink-dim);
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.6;
  margin-top: 16px;
}

.muted {
  color: var(--ink-muted);
}

.brand-text {
  color: var(--brand-bright);
}

.grad-text {
  background: linear-gradient(100deg, #ffffff 0%, #c5bdff 55%, var(--brand-bright) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ----------------------------- buttons ----------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 44px;
  padding: 0 20px;
  border-radius: var(--r-sm);
  font-family: inherit;
  font-weight: 600;
  font-size: 14.5px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease,
    background 0.16s ease, border-color 0.16s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(180deg, var(--brand-bright) 0%, var(--brand) 100%);
  color: #fff;
  box-shadow: var(--shadow-brand), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 26px 60px -18px rgba(64, 45, 243, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.02);
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: var(--brand-bright);
  background: var(--brand-soft);
}

.btn-sm { height: 38px; padding: 0 15px; font-size: 13.5px; }
.btn-lg { height: 50px; padding: 0 26px; font-size: 15.5px; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--brand-bright);
  font-weight: 600;
  font-size: 14.5px;
}
.link-arrow:hover { gap: 10px; }

/* ----------------------------- nav ----------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(7, 11, 31, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-nav__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.site-nav__logo { display: flex; align-items: center; gap: 9px; flex-shrink: 0; }
.site-nav__logo img { height: 26px; width: auto; }
.site-nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}
.site-nav__spacer { flex: 1; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--r-sm);
  /* reset native <button> styling (Products/Community triggers) for blog pages
     that don't load Tailwind preflight */
  background: transparent;
  border: 0;
  font-family: inherit;
  color: var(--ink-dim);
  font-size: 14.5px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.04); }
.nav-link svg { opacity: 0.7; }

/* dropdown */
.nav-dd { position: relative; }
.nav-dd__menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 280px;
  background: var(--panel-solid);
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  padding: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
}
.nav-dd:hover .nav-dd__menu,
.nav-dd:focus-within .nav-dd__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dd__item {
  display: block;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  transition: background 0.14s ease;
}
.nav-dd__item:hover { background: var(--brand-soft); }
.nav-dd__item-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 7px;
}
.nav-dd__item-desc {
  font-size: 12.5px;
  color: var(--ink-muted);
  margin-top: 2px;
  line-height: 1.4;
}

.nav-ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
  font-family: var(--font-mono);
}
.nav-ghost-btn:hover { border-color: var(--brand-bright); background: var(--brand-soft); }
.nav-ghost-btn .star { color: var(--term-amber); }

.site-nav__burger {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  width: 38px;
  height: 36px;
  color: var(--ink);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ----------------------------- footer ----------------------------- */
.site-foot {
  border-top: 1px solid var(--line);
  background: rgba(5, 8, 24, 0.6);
  padding-block: 54px 28px;
}

/* ----------------------------- card ----------------------------- */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px;
  transition: border-color 0.18s ease, transform 0.18s ease,
    box-shadow 0.18s ease;
}
.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--brand-soft);
  border: 1px solid var(--line-strong);
  color: var(--brand-bright);
  margin-bottom: 16px;
}
.card__title { font-size: 17px; font-weight: 650; margin: 0 0 8px; }
.card__body { color: var(--ink-muted); font-size: 14.5px; line-height: 1.6; margin: 0; }

/* ----------------------------- terminal ----------------------------- */
.term {
  background: linear-gradient(180deg, #0c1330 0%, #080d22 100%);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow), 0 0 0 1px rgba(64, 45, 243, 0.08);
  overflow: hidden;
  font-family: var(--font-mono);
}
.term__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}
.term__dot { width: 11px; height: 11px; border-radius: 50%; }
.term__dot--r { background: #ff5f57; }
.term__dot--y { background: #febc2e; }
.term__dot--g { background: #28c840; }
.term__title {
  margin-left: 8px;
  font-size: 12.5px;
  color: var(--ink-faint);
}
.term__body {
  padding: 18px 18px 22px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-dim);
}
.term__line { white-space: pre-wrap; overflow-wrap: anywhere; }
.term__prompt { color: var(--brand-bright); }
.term__cmd { color: #fff; }
.term__ok { color: var(--term-green); }
.term__dim { color: var(--ink-faint); }
.term__cy { color: var(--term-cyan); }
.term__am { color: var(--term-amber); }
.cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  margin-left: 2px;
  background: var(--brand-bright);
  vertical-align: text-bottom;
  animation: blink 1.05s steps(2, start) infinite;
}
@keyframes blink { to { opacity: 0; } }

/* ----------------------------- grids ----------------------------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ----------------------------- responsive ----------------------------- */
@media (max-width: 920px) {
  .site-nav__links { display: none; }
  .site-nav__burger { display: inline-flex; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr !important; }

  /* static blog nav: burger toggles `.open` (React nav uses its own menu) */
  .site-nav.open .site-nav__links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    padding: 12px 16px 18px;
    background: var(--panel-solid);
    border-bottom: 1px solid var(--line-strong);
  }
  .site-nav.open .nav-dd__menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: 0;
    padding-left: 12px;
    min-width: 0;
  }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .container { padding-inline: 18px; }
}

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


/* blog index */
.blog-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.blog-tab{font-family:var(--font-mono);font-size:13px;color:var(--ink-muted);padding:7px 13px;border-radius:999px;border:1px solid var(--line);background:var(--panel)}
.blog-tab:hover{color:#fff;border-color:var(--brand-bright)}
.blog-cat{padding-block:36px;border-top:1px solid var(--line);scroll-margin-top:var(--nav-h)}
.blog-cat__label{font-size:22px;font-weight:700;margin:0}
.blog-cat__desc{color:var(--ink-muted);font-size:14.5px;margin:6px 0 0;max-width:60ch}
.post-list{display:grid;gap:2px;margin-top:18px}
.post-row{display:flex;gap:20px;justify-content:space-between;align-items:baseline;padding:16px;border-radius:12px;transition:background .15s ease}
.post-row:hover{background:var(--panel)}
.post-row__title{font-size:16.5px;font-weight:650;margin:0;color:var(--ink)}
.post-row__desc{font-size:14px;color:var(--ink-muted);margin:5px 0 0;line-height:1.55;max-width:66ch}
.post-row__date{font-family:var(--font-mono);font-size:12.5px;color:var(--ink-faint);white-space:nowrap;flex-shrink:0}
/* article */
.post-title{font-size:clamp(28px,3.6vw,42px);line-height:1.12;letter-spacing:-0.02em;font-weight:750;margin:14px 0 0}
.post-meta{font-family:var(--font-mono);font-size:13px;color:var(--ink-faint);margin:14px 0 0}
.post-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:48px;padding-top:32px;border-top:1px solid var(--line)}
.prose{margin-top:32px;color:var(--ink-dim);font-size:16.5px;line-height:1.75}
.prose h2{font-size:26px;font-weight:700;letter-spacing:-0.01em;color:var(--ink);margin:42px 0 14px;line-height:1.2}
.prose h3{font-size:20px;font-weight:650;color:var(--ink);margin:32px 0 12px}
.prose h4{font-size:17px;font-weight:650;color:var(--ink);margin:26px 0 10px}
.prose p{margin:0 0 18px}
.prose a{color:var(--brand-bright);text-decoration:underline;text-underline-offset:2px}
.prose a.header-anchor{text-decoration:none;color:inherit}
.prose ul,.prose ol{margin:0 0 18px;padding-left:24px;display:grid;gap:8px}
.prose li{padding-left:4px}
.prose strong{color:var(--ink);font-weight:650}
.prose blockquote{margin:24px 0;padding:4px 18px;border-left:3px solid var(--brand);color:var(--ink-muted);background:var(--panel);border-radius:0 8px 8px 0}
.prose code{font-family:var(--font-mono);font-size:0.88em;background:rgba(124,137,196,.14);padding:2px 6px;border-radius:5px;color:#dfe3ff}
.prose pre{margin:22px 0;padding:16px 18px;border-radius:12px;background:#070d22;border:1px solid var(--line-strong);overflow-x:auto}
.prose pre code{background:none;padding:0;font-size:13.5px;line-height:1.6;color:#dfe3ff}
.prose img{max-width:100%;height:auto;border-radius:12px;border:1px solid var(--line);margin:24px 0}
.prose table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14.5px}
.prose th,.prose td{border:1px solid var(--line-strong);padding:10px 12px;text-align:left}
.prose th{background:var(--panel);color:var(--ink);font-weight:650}
.prose hr{border:none;border-top:1px solid var(--line);margin:36px 0}
@media (max-width:640px){.post-row{flex-direction:column;gap:6px}.post-row__date{order:-1}}