/* Digital MBSE Solutions LLC — blue / black / white B2B theme */
:root {
  --bg: #0a0e17;
  --bg-alt: #0f172a;
  --surface: #111827;
  --surface-raised: #1e293b;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-bright: #3b82f6;
  --accent-hover: #1d4ed8;
  --border: #1e3a5f;
  --border-soft: #334155;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.28);
  --max: 1100px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 1.05rem;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent-bright); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: #60a5fa; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--white);
  padding: 0.5rem 1rem;
  z-index: 1000;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(10px);
  color: var(--text);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  text-decoration: none;
  color: var(--text);
}
.logo:hover { color: var(--text); }
.logo-mark {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
}
.logo-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem 0.95rem;
  flex-wrap: wrap;
}
.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent-bright);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  font-family: inherit;
}
.btn-primary {
  background: var(--accent);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--white);
}
.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--accent-bright);
}
.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.12);
  color: var(--text);
  border-color: #60a5fa;
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-soft);
}
.btn-outline:hover {
  border-color: var(--accent-bright);
  color: var(--accent-bright);
}
.btn-header {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

/* Hero */
.hero {
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(37, 99, 235, 0.22), transparent 55%),
    linear-gradient(165deg, #0a0e17 0%, #0f172a 50%, #111827 100%);
  color: var(--text);
  padding: 3.5rem 0 3.25rem;
}
.hero-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #93c5fd;
  margin-bottom: 0.85rem;
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 4vw, 2.55rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--white);
  max-width: 20ch;
}
.hero-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 42rem;
  margin: 0 0 1.75rem;
}
.hero-lead strong { color: var(--text); }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Media / figures */
.media {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 16 / 10;
  background: var(--surface-raised);
}
.media figcaption {
  padding: 0.65rem 0.9rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-soft);
  background: var(--surface);
}
.media-tall img { aspect-ratio: 4 / 3; }
.media-square img { aspect-ratio: 1 / 1; }

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}
.gallery .media img { aspect-ratio: 4 / 3; }

.media-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: center;
}
.media-split.reverse > :first-child { order: 2; }

/* Sections */
.section {
  padding: 3.25rem 0;
}
.section-alt { background: var(--bg-alt); }
.section-surface { background: var(--surface); }

.section-header {
  margin-bottom: 1.75rem;
  max-width: 42rem;
}
.section-header h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.45rem, 2.5vw, 1.85rem);
  color: var(--white);
  line-height: 1.25;
}
.section-header p {
  margin: 0;
  color: var(--text-muted);
}

.muted { color: var(--text-muted); }
.small { font-size: 0.9rem; }

/* Cards / grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--white);
}
.card p { margin: 0; color: var(--text-muted); font-size: 0.98rem; }
.card a.card-link {
  display: inline-block;
  margin-top: 0.85rem;
  font-weight: 600;
  text-decoration: none;
}
.card a.card-link:hover { text-decoration: underline; }
.card .card-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 8px;
  background: rgba(37, 99, 235, 0.18);
  color: var(--accent-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.85rem;
  border: 1px solid var(--border);
}

.list-check {
  list-style: none;
  padding: 0;
  margin: 0;
}
.list-check li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.65rem;
  color: var(--text-muted);
}
.list-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--accent-bright);
}

.pill {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.2);
  color: #93c5fd;
  margin-bottom: 0.65rem;
  border: 1px solid var(--border);
}
.pill-amber {
  background: rgba(217, 119, 6, 0.15);
  color: #fbbf24;
  border-color: rgba(217, 119, 6, 0.35);
}

.callout {
  border-left: 4px solid var(--accent);
  background: var(--surface);
  padding: 1.15rem 1.35rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-left-color: var(--accent);
}
.callout.caution {
  border-left-color: #d97706;
  background: rgba(217, 119, 6, 0.08);
}
.callout h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: var(--white);
}
.callout p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }

.stack-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--border-soft);
}
.stack-row:last-child { border-bottom: none; }
.stack-num {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.stack-row h3 { margin: 0 0 0.35rem; font-size: 1.1rem; color: var(--white); }
.stack-row p { margin: 0; color: var(--text-muted); }

.cta-band {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 55%, #1e40af 100%);
  color: var(--text);
  padding: 2.75rem 0;
  text-align: center;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cta-band h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  color: var(--white);
}
.cta-band p {
  margin: 0 auto 1.35rem;
  max-width: 36rem;
  color: var(--text-muted);
}
.cta-band .btn-primary {
  background: var(--white);
  color: #0f172a;
}
.cta-band .btn-primary:hover {
  background: #e2e8f0;
  color: #0a0e17;
}

/* Page hero (inner pages) */
.page-hero {
  background:
    radial-gradient(ellipse 70% 80% at 90% 10%, rgba(37, 99, 235, 0.18), transparent 50%),
    var(--bg-alt);
  color: var(--text);
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  color: var(--white);
}
.page-hero p {
  margin: 0;
  color: var(--text-muted);
  max-width: 42rem;
}

/* Contact form */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  align-items: start;
}
.form-card label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--text);
}
.form-card .field { margin-bottom: 1rem; }
.form-card input,
.form-card textarea,
.form-card select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  font: inherit;
  background: var(--bg);
  color: var(--text);
}
.form-card input:focus,
.form-card textarea:focus,
.form-card select:focus {
  outline: 2px solid var(--accent-bright);
  outline-offset: 1px;
  border-color: var(--accent);
}
.form-card textarea { min-height: 140px; resize: vertical; }
.form-card select option { background: var(--surface); color: var(--text); }
.form-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

.contact-details dt {
  font-weight: 600;
  color: var(--text);
  font-size: 0.85rem;
  margin-top: 1rem;
}
.contact-details dt:first-child { margin-top: 0; }
.contact-details dd {
  margin: 0.2rem 0 0;
  color: var(--text-muted);
}
.contact-details a { text-decoration: none; }
.contact-details a:hover { text-decoration: underline; }

/* Footer */
.site-footer {
  background: #060912;
  color: var(--text-muted);
  padding: 2.5rem 0 1.5rem;
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}
.footer-brand strong {
  display: block;
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 0.35rem;
}
.footer-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--white); }
.footer-nav li { margin-bottom: 0.35rem; }
.footer-heading {
  color: var(--white);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.65rem;
}
.footer-bottom {
  border-top: 1px solid var(--border-soft);
  padding-top: 1.15rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  font-size: 0.82rem;
}

.prose h2 {
  color: var(--white);
  margin-top: 2rem;
  margin-bottom: 0.65rem;
}
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--text-muted); }
.prose ul { color: var(--text-muted); padding-left: 1.25rem; }
.prose li { margin-bottom: 0.4rem; }
.prose strong { color: var(--text); }

@media (max-width: 960px) {
  .hero-layout,
  .media-split,
  .media-split.reverse > :first-child { grid-template-columns: 1fr; order: initial; }
  .media-split.reverse > :first-child { order: 0; }
  .gallery { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { max-width: none; }
  .gallery { grid-template-columns: 1fr; }
}

@media (min-width: 641px) and (max-width: 960px) {
  .gallery { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .nav { width: 100%; }
}