/* ============================================================
   LMM Technologies — shared design system
   Editorial · light · research-grade
   ============================================================ */

:root {
  /* Typography */
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono:  'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* Color — text */
  --color-text-primary:   #14181f;
  --color-text-secondary: #3f4754;
  --color-text-tertiary:  #8a93a3;

  /* Color — surfaces */
  --color-bg:        #ffffff;
  --color-bg-subtle: #f6f7f9;
  --color-bg-ink:    #0e1320;

  /* Color — borders */
  --color-border-primary:   #c3c9d3;
  --color-border-secondary: #d3d8e0;
  --color-border-tertiary:  #e7eaef;

  /* Color — accent */
  --color-accent:        #2456c8;
  --color-accent-soft:   #eaf0fc;
  --color-accent-ink:    #16306f;

  /* Layout */
  --maxw: 1080px;
  --maxw-read: 720px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--color-accent); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

/* ── Site navigation ─────────────────────────────────────── */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.86);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--color-border-tertiary);
}
.site-nav-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.85rem 1.5rem;
}
.brand {
  font-family: var(--font-serif);
  font-size: 1.15rem; font-weight: 600;
  color: var(--color-text-primary); text-decoration: none;
  letter-spacing: -0.01em;
}
.brand .brand-mark { color: var(--color-accent); }
.nav-links { display: flex; gap: 1.6rem; align-items: center; }
.nav-links a {
  font-size: 0.9rem; font-weight: 500;
  color: var(--color-text-secondary); text-decoration: none;
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--color-text-primary); }
.nav-links a.nav-cta {
  font-family: var(--font-mono); font-size: 0.78rem;
  letter-spacing: 0.03em;
  border: 1px solid var(--color-border-primary);
  padding: 0.4rem 0.8rem; border-radius: 999px;
}
.nav-links a.nav-cta:hover { border-color: var(--color-accent); color: var(--color-accent); }
@media (max-width: 620px) {
  .nav-links { gap: 1rem; }
  .nav-links a.label-full { display: none; }
}

/* ── Shared eyebrow / labels ─────────────────────────────── */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-text-tertiary);
}

/* ── Section scaffolding ─────────────────────────────────── */
.section { padding: 5rem 0; }
.section + .section { border-top: 1px solid var(--color-border-tertiary); }
.section-subtle { background: var(--color-bg-subtle); }
.section-head { max-width: var(--maxw-read); margin-bottom: 2.5rem; }
.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 500; font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  line-height: 1.18; letter-spacing: -0.015em;
  margin: 0.7rem 0 0.9rem;
}
.section-head p {
  color: var(--color-text-secondary); font-size: 1.06rem;
  max-width: 60ch;
}

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden;
  background: var(--color-bg-ink); color: #eef1f6;
  padding: 6.5rem 0 6rem;
}
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 60% at 78% 18%, rgba(36,86,200,0.30), transparent 60%),
    radial-gradient(ellipse 60% 55% at 12% 92%, rgba(36,86,200,0.16), transparent 60%);
}
.hero-grid {
  position: relative; z-index: 1;
  max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3rem; align-items: center;
}
.hero .eyebrow { color: rgba(255,255,255,0.55); }
.hero h1 {
  font-family: var(--font-serif); font-weight: 500;
  font-size: clamp(2.4rem, 5.4vw, 3.8rem); line-height: 1.08;
  letter-spacing: -0.02em; margin: 1.1rem 0 1.1rem;
}
.hero .lede {
  font-size: 1.18rem; color: rgba(255,255,255,0.74);
  max-width: 34ch; line-height: 1.6;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2rem; }
.hero-meta { margin-top: 2.2rem; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
.hero-figure { display: flex; justify-content: center; align-items: center; }
@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-figure { order: -1; }
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-block; text-decoration: none;
  font-size: 0.92rem; font-weight: 600;
  padding: 0.72rem 1.3rem; border-radius: 999px;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: #ffffff; color: #0e1320; }
.btn-primary:hover { background: #e6ebf5; }
.btn-ghost { background: transparent; color: #eef1f6; border: 1px solid rgba(255,255,255,0.32); }
.btn-ghost:hover { border-color: #ffffff; }
.btn-dark { background: var(--color-text-primary); color: #fff; }
.btn-dark:hover { background: #000; }

/* ── Stat band ───────────────────────────────────────────── */
.stat-band {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem;
  max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem;
}
.stat { padding: 0.4rem 0; }
.stat .stat-num {
  font-family: var(--font-serif); font-weight: 500;
  font-size: clamp(1.9rem, 3.6vw, 2.6rem); line-height: 1;
  color: var(--color-text-primary); letter-spacing: -0.02em;
}
.stat .stat-num span { color: var(--color-accent); }
.stat .stat-label {
  margin-top: 0.5rem; font-size: 0.86rem; color: var(--color-text-secondary);
  line-height: 1.45;
}
@media (max-width: 760px) { .stat-band { grid-template-columns: repeat(2, 1fr); gap: 1.6rem 1.2rem; } }

/* ── Card grid ───────────────────────────────────────────── */
.grid { display: grid; gap: 1.1rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border-tertiary);
  border-radius: 14px; padding: 1.5rem;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.card:hover { border-color: var(--color-border-primary); transform: translateY(-2px); box-shadow: 0 12px 30px -18px rgba(20,24,31,0.25); }
.card h3 {
  font-family: var(--font-sans); font-weight: 700; font-size: 1.05rem;
  color: var(--color-text-primary); margin-bottom: 0.45rem; letter-spacing: -0.01em;
}
.card p { color: var(--color-text-secondary); font-size: 0.95rem; }
.card .card-kicker {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-accent); margin-bottom: 0.7rem;
}

/* link card (for read-more) */
a.card { text-decoration: none; display: block; }
a.card .card-arrow { color: var(--color-accent); font-weight: 600; font-size: 0.9rem; margin-top: 0.9rem; display: inline-block; }

/* ── Pipeline / steps ────────────────────────────────────── */
.pipeline { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: stretch; }
.pipe-step {
  flex: 1 1 150px; background: var(--color-bg); border: 1px solid var(--color-border-tertiary);
  border-radius: 12px; padding: 1.1rem 1.1rem 1.2rem; position: relative;
}
.pipe-step .pipe-n {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--color-accent);
  letter-spacing: 0.08em;
}
.pipe-step h4 { font-size: 0.98rem; font-weight: 700; margin: 0.35rem 0 0.3rem; letter-spacing: -0.01em; }
.pipe-step p { font-size: 0.85rem; color: var(--color-text-secondary); line-height: 1.5; }

/* ── Callout ─────────────────────────────────────────────── */
.callout {
  background: var(--color-accent-soft);
  border-left: 3px solid var(--color-accent);
  padding: 1.3rem 1.5rem; border-radius: 0 10px 10px 0;
  margin: 0; font-size: 1rem; color: var(--color-text-secondary);
}
.callout strong { color: var(--color-accent-ink); }

/* ── Pull quote ──────────────────────────────────────────── */
.pull {
  font-family: var(--font-serif); font-style: italic;
  font-size: clamp(1.3rem, 2.6vw, 1.65rem); line-height: 1.4;
  color: var(--color-text-primary); max-width: 24ch;
}

/* ── Two-column feature ──────────────────────────────────── */
.feature { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 3rem; align-items: start; }
@media (max-width: 820px) { .feature { grid-template-columns: 1fr; gap: 1.5rem; } }

/* ── Prose (research / article) ──────────────────────────── */
.prose { max-width: var(--maxw-read); margin: 0 auto; }
.prose h2 {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 1.75rem; line-height: 1.2; letter-spacing: -0.015em;
  margin: 3.2rem 0 1rem;
}
.prose h3 {
  font-family: var(--font-sans); font-weight: 700; font-size: 1.12rem;
  margin: 2rem 0 0.5rem; letter-spacing: -0.01em;
}
.prose p { margin-bottom: 1.15rem; color: var(--color-text-secondary); }
.prose strong { color: var(--color-text-primary); font-weight: 600; }
.prose ul { margin: 0.4rem 0 1.3rem 0; list-style: none; }
.prose ul li { position: relative; padding-left: 1.3rem; margin-bottom: 0.6rem; color: var(--color-text-secondary); }
.prose ul li::before {
  content: ''; position: absolute; left: 0; top: 0.62rem;
  width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent);
}
.prose-lead { font-size: 1.12rem; color: var(--color-text-secondary); }

/* ── Tables ──────────────────────────────────────────────── */
.table-wrap { margin: 1.5rem 0 0.6rem; overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
thead th {
  background: var(--color-bg-ink); color: #fff; font-weight: 600;
  text-align: center; padding: 0.65rem 0.9rem; font-size: 0.82rem;
}
thead th:first-child { text-align: left; }
tbody td { padding: 0.6rem 0.9rem; border-bottom: 1px solid var(--color-border-tertiary); text-align: center; }
tbody td:first-child { text-align: left; font-weight: 600; color: var(--color-text-primary); }
tbody tr:last-child td { border-bottom: 2px solid var(--color-bg-ink); }
.hl { background: var(--color-accent-soft); font-weight: 700; color: var(--color-accent-ink); }
.table-caption { font-size: 0.82rem; color: var(--color-text-tertiary); font-style: italic; text-align: center; margin-top: 0.5rem; }

/* ── Architecture diagram (mono pre) ─────────────────────── */
.arch-diagram {
  background: var(--color-bg-subtle); border: 1px solid var(--color-border-tertiary);
  border-radius: 10px; padding: 1.4rem; margin: 1.4rem 0;
  font-family: var(--font-mono); font-size: 0.74rem; line-height: 1.65;
  white-space: pre; overflow-x: auto; color: var(--color-text-primary);
}

/* ── Media figure (video / image) ────────────────────────── */
.media-fig { margin: 1.6rem 0 0.6rem; }
.media-fig video, .media-fig img {
  display: block; width: 100%; max-width: 680px; margin: 0 auto;
  border: 1px solid var(--color-border-tertiary); border-radius: 10px;
  background: var(--color-bg-subtle);
}
.media-fig figcaption {
  font-size: 0.82rem; color: var(--color-text-tertiary); font-style: italic;
  text-align: center; margin-top: 0.5rem;
}

/* ── Divider ─────────────────────────────────────────────── */
.divider { border: none; height: 1px; background: linear-gradient(to right, transparent, var(--color-border-secondary), transparent); margin: 3rem 0; }

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  background: var(--color-bg-ink); color: rgba(255,255,255,0.6);
  padding: 3.5rem 0 2.5rem;
}
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2rem; }
.site-footer .foot-brand { font-family: var(--font-serif); font-size: 1.2rem; color: #fff; }
.site-footer .foot-tag { font-size: 0.9rem; margin-top: 0.4rem; max-width: 34ch; }
.site-footer a { color: rgba(255,255,255,0.78); text-decoration: none; }
.site-footer a:hover { color: #fff; }
.foot-links { display: flex; gap: 2.5rem; }
.foot-col h5 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: 0.7rem; }
.foot-col a { display: block; font-size: 0.9rem; margin-bottom: 0.4rem; }
.foot-legal { width: 100%; border-top: 1px solid rgba(255,255,255,0.1); margin-top: 1rem; padding-top: 1.5rem; font-size: 0.8rem; color: rgba(255,255,255,0.4); }

.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; }

/* ── Pose-skeleton hero motif ────────────────────────────── */
.skeleton { width: 100%; max-width: 360px; height: auto; }
.skeleton .bone { stroke: rgba(120,160,255,0.55); stroke-width: 2.2; stroke-linecap: round; fill: none; }
.skeleton .joint { fill: #8fb4ff; }
.skeleton .joint-core { fill: #ffffff; }
@media (prefers-reduced-motion: no-preference) {
  .skeleton .limb-anim { animation: sway 3.6s ease-in-out infinite; transform-origin: center; transform-box: fill-box; }
  .skeleton .pulse { animation: pulse 2.8s ease-in-out infinite; }
}
@keyframes sway {
  0%, 100% { transform: rotate(0deg); }
  50%      { transform: rotate(7deg); }
}
@keyframes pulse {
  0%, 100% { opacity: 0.5; r: 4; }
  50%      { opacity: 1;   r: 5.5; }
}