/* =============================================================
   Software Architects — Variant B (Technical)
   ============================================================= */

:root {
  --bg: #0E1116;
  --bg-elev: #12161D;
  --fg: #E8EAED;
  --fg-muted: #9AA4B2;
  --accent: #5EE6A8;
  --accent-2: #C7D2FE;
  --rule: #1F242D;
  --rule-strong: #2A3340;

  --font-sans: 'Inter', 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --wide-max: 1120px;
  --page-gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-gap: clamp(72px, 10vw, 120px);

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

html { -webkit-text-size-adjust: 100%; overflow-x: hidden; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  position: relative;
  overflow-x: clip;
}

/* Blueprint grid background — full-page, faint, fades out below 640px */
@media (min-width: 640px) {
  body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
      linear-gradient(to right, var(--rule) 1px, transparent 1px),
      linear-gradient(to bottom, var(--rule) 1px, transparent 1px);
    background-size: 80px 80px;
    opacity: 0.35;
    mask-image: radial-gradient(ellipse at 50% 20%, #000 0%, rgba(0,0,0,0.7) 70%, transparent 100%);
  }
  body > * { position: relative; z-index: 1; }
}

@media (min-width: 900px) {
  body { font-size: 17px; }
}

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

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { color: var(--fg); }

h1, h2, h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--fg);
}

p { margin: 0 0 1.1em; }

strong { font-weight: 500; color: var(--fg); }

address { font-style: normal; }

/* Utility */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px; left: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.6rem 1rem;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: 13px;
}
.skip-link:focus { top: 0; }

.wide {
  max-width: var(--wide-max);
  margin: 0 auto;
  padding-left: var(--page-gutter);
  padding-right: var(--page-gutter);
}

.section {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  border-bottom: 1px solid var(--rule);
}

.mono-marker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.5rem;
}
.mono-marker span { color: var(--fg-muted); margin-right: 0.6em; }

.mono-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin: 0 0 1.75rem;
}
.mono-eyebrow__sep { color: var(--rule-strong); margin: 0 0.4em; }

.mono-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin: 1.5rem 0 0;
}

.section-heading {
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  font-weight: 700;
  margin: 0 0 2.25rem;
  text-wrap: balance;
}

.divider {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
  text-align: center;
  margin: 3rem 0 1.75rem;
  opacity: 0.8;
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* =============================================================
   Site header
   ============================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}

.site-header__inner {
  max-width: var(--wide-max);
  margin: 0 auto;
  padding: 0.9rem var(--page-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15em;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--fg);
  letter-spacing: 0;
}
.wordmark__bracket { color: var(--accent); }
.wordmark:hover .wordmark__bracket { color: var(--fg); }

.site-nav { position: relative; }

.site-nav__toggle {
  display: none;
  appearance: none;
  border: 1px solid var(--rule-strong);
  background: transparent;
  padding: 8px 10px;
  cursor: pointer;
  color: var(--fg);
  border-radius: 2px;
}
.site-nav__bars,
.site-nav__bars::before,
.site-nav__bars::after {
  content: "";
  display: block;
  width: 20px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.site-nav__bars { position: relative; }
.site-nav__bars::before { position: absolute; top: -6px; left: 0; }
.site-nav__bars::after  { position: absolute; top:  6px; left: 0; }

.site-nav__toggle[aria-expanded="true"] .site-nav__bars { background: transparent; }
.site-nav__toggle[aria-expanded="true"] .site-nav__bars::before { transform: translateY(6px) rotate(45deg); }
.site-nav__toggle[aria-expanded="true"] .site-nav__bars::after  { transform: translateY(-6px) rotate(-45deg); }

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}

.site-nav__list a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--fg-muted);
  padding: 0.5rem 0;
  transition: color 0.15s var(--ease);
}
.site-nav__list a.is-active { color: var(--accent); }
.site-nav__list a.is-active::before { content: "> "; }
.site-nav__list a:hover { color: var(--accent); }

@media (max-width: 719px) {
  .site-nav__toggle { display: inline-flex; }
  .site-nav__list {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    padding: 0.75rem var(--page-gutter) 1.25rem;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
  }
  .site-nav[data-open="true"] .site-nav__list {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-nav__list a {
    display: block;
    font-size: 14px;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--rule);
  }
  .site-nav__list li:last-child a { border-bottom: 0; }
}

/* =============================================================
   Hero
   ============================================================= */

.hero {
  padding-top: clamp(4rem, 10vw, 7rem);
  padding-bottom: var(--section-gap);
  border-bottom: 1px solid var(--rule);
}

.hero__heading {
  font-size: clamp(2.1rem, 6vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0 0 1.5rem;
  max-width: 16ch;
  text-wrap: balance;
}

.hero__lede {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--fg-muted);
  max-width: 34em;
  margin: 0 0 2rem;
}

.hero__cta { margin: 0; }

/* =============================================================
   Monospace button
   ============================================================= */

.btn-mono {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  padding: 0.8rem 1.2rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  border-radius: 2px;
  transition: color 0.15s var(--ease), background 0.15s var(--ease), border-color 0.15s var(--ease);
}
.btn-mono:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn-mono--inline {
  padding: 0.5rem 0.9rem;
  font-size: 0.9rem;
}

.link-mono {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}
.link-mono:hover { color: var(--fg); }

/* =============================================================
   Card grid (services + industries)
   ============================================================= */

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.card {
  background: var(--bg);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0;
}

.card__title {
  font-family: var(--font-sans);
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  font-weight: 500;
  margin: 0;
  color: var(--fg);
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.card__body {
  color: var(--fg-muted);
  margin: 0;
  font-size: 0.95rem;
}

@media (min-width: 720px) {
  .cards { grid-template-columns: 1fr 1fr 1fr; }
  .card { padding: 2rem; }
}

/* =============================================================
   Technologies strip
   ============================================================= */

.tech-strip {
  padding: 1rem 0;
}

.tech-strip__list {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 2;
  color: var(--fg);
  margin: 0;
  word-spacing: 0.15em;
}
.tech-strip__list > span { display: inline-block; }
.tech-strip__list > span + span { margin-left: 0.5em; }
.tech-strip__list > span:nth-child(even) { color: var(--fg-muted); }

/* =============================================================
   About
   ============================================================= */

.about {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

.about__text p { max-width: 36em; color: var(--fg-muted); }
.about__text > p:first-of-type { color: var(--fg); }
.about__languages { color: var(--fg); }

.about__portrait {
  margin: 0;
  width: 160px;
}
.about__portrait img {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule-strong);
  filter: saturate(0.7) contrast(1.05) brightness(0.95);
  border-radius: 2px;
}

@media (min-width: 720px) {
  .about {
    grid-template-columns: 1fr auto;
    gap: 3rem;
  }
  .about__text { order: 1; }
  .about__portrait { order: 2; width: 180px; }
}

/* =============================================================
   Contact
   ============================================================= */

.contact__lede { color: var(--fg-muted); margin-bottom: 1.75rem; }

.contact__email { margin: 0 0 2rem; }

.contact__address {
  color: var(--fg-muted);
  margin: 0 0 2rem;
  line-height: 1.8;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.contact__imprint { margin: 0; }

/* =============================================================
   Footer
   ============================================================= */

.site-footer {
  margin-top: var(--section-gap);
  padding: 2.25rem 0 2.75rem;
  border-top: 1px solid var(--rule);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.site-footer__mark {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--fg-muted);
  margin: 0;
}
.site-footer__mark span { color: var(--accent); }

.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.site-footer__meta a { color: var(--fg-muted); }
.site-footer__meta a:hover { color: var(--accent); }

@media (min-width: 720px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* =============================================================
   Imprint page
   ============================================================= */

.imprint-page .section { border-bottom: 0; }

.imprint {
  padding-top: clamp(4rem, 10vw, 6rem);
  padding-bottom: var(--section-gap);
}

.imprint__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem 2rem;
  margin: 2rem 0;
  padding: 1.5rem;
  border: 1px solid var(--rule);
  background: color-mix(in oklab, var(--bg) 85%, var(--bg-elev));
}
.imprint__list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.imprint__list dd {
  margin: 0;
  line-height: 1.6;
  color: var(--fg);
}

@media (min-width: 720px) {
  .imprint__list {
    grid-template-columns: 240px 1fr;
    gap: 1rem 2rem;
    align-items: baseline;
    padding: 2rem 2.25rem;
  }
}

.imprint__back { margin-top: 2.5rem; }