/* ==================================================================
   PSIGMBH — Swiss/Helvetic landing
   Inter (body) + Geist (display). Near-black on off-white.
   8px grid, 1px borders, single accent for CTAs only.
================================================================== */

:root {
  --bg: #FAFAFA;
  --bg-elevated: #FFFFFF;
  --ink: #0A0A0A;
  --ink-soft: #404040;
  --muted: #737373;
  --border: #E5E5E5;
  --border-strong: #D4D4D4;
  --accent: #1E40AF;
  --accent-hover: #1E3A8A;
  --accent-soft: rgba(30, 64, 175, 0.08);

  --max-width: 1200px;
  --gutter: 24px;            /* 8px * 3 */
  --section-pad: 120px;      /* 8px * 15 */

  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --display: 'Geist', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius: 6px;
  --focus: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

/* ------- Reset ------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'cv11', 'ss01', 'ss03';
}

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

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 120ms ease;
}
a:hover { color: var(--accent); }

/* Focus-visible rings on all interactive elements */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}
button:focus-visible,
.btn:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ------- Layout ------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ------- Typography ------- */
h1, h2, h3 {
  font-family: var(--display);
  margin: 0;
  color: var(--ink);
  font-weight: 600;
}

h1 {
  font-size: 40px;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
}

h2 {
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

h3 {
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  font-weight: 500;
}

p { margin: 0 0 16px; max-width: 65ch; }

.eyebrow {
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  margin: 0 0 16px;
}

.lead {
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0 0 32px;
}

.section-lead {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 65ch;
  margin: 0 0 48px;
}

@media (min-width: 1024px) {
  h1 { font-size: 64px; line-height: 1.0; margin-bottom: 32px; }
  h2 { font-size: 44px; line-height: 1.05; margin-bottom: 24px; }
  h3 { font-size: 18px; }
  .lead { font-size: 20px; max-width: 60ch; }
}

/* ------- Header ------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--ink);
  color: #fff;
  border-radius: 4px;
  font-family: var(--display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.brand-text {
  font-family: var(--display);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 32px;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--ink); }

/* ------- Hero ------- */
.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--border);
}

.hero h1 { max-width: 16ch; }

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ------- Buttons ------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  padding: 12px 20px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 120ms ease,
    background-color 120ms ease,
    color 120ms ease,
    border-color 120ms ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
  transform: translateY(-1px);
}
.btn-ghost:active { transform: translateY(0); }

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ------- Sections ------- */
.section { padding: 80px 0; }
.section-alt {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

@media (min-width: 1024px) {
  .section { padding: var(--section-pad) 0; }
  .hero { padding: 144px 0 120px; }
}

/* ------- Grid / cards ------- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}
@media (min-width: 1024px) {
  .grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 120ms ease;
}
.card:hover { border-color: var(--border-strong); }
.card h3 { margin-bottom: 12px; }
.card p { color: var(--ink-soft); margin: 0; }

/* Project cards: clickable, with a clear link affordance */
.project-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 120ms ease, transform 120ms ease;
}
.project-card:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}
.project-card p { flex: 1; }

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  margin-top: 4px;
  align-self: flex-start;
  transition: color 120ms ease, gap 120ms ease;
}
.project-link:hover {
  color: var(--accent-hover);
  gap: 10px;
}
.project-link svg { transition: transform 120ms ease; }
.project-link:hover svg { transform: translate(1px, -1px); }

/* ------- About ------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}
.about-grid p { color: var(--ink-soft); }

@media (min-width: 1024px) {
  .about-grid { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 80px; }
}

.about-facts {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.about-facts dl {
  margin: 0;
  display: grid;
  gap: 24px;
}
.about-facts dt {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 500;
  margin: 0 0 4px;
}
.about-facts dd {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

/* ------- Contact ------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}
@media (min-width: 1024px) {
  .contact-grid { grid-template-columns: 1fr 1fr; gap: 80px; }
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.contact-list li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.contact-list strong {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 500;
  align-self: center;
}
.contact-list a, .contact-list span:not(.bar-label) { color: var(--ink); }

/* ------- Form ------- */
.contact-form {
  display: grid;
  gap: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.contact-form input,
.contact-form textarea {
  font: inherit;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
  color: var(--ink);
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  width: 100%;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.contact-form input:hover,
.contact-form textarea:hover { border-color: var(--ink-soft); }
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form button { justify-self: start; margin-top: 8px; }

/* Honeypot — hidden from users, visible to bots */
.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
}

.form-status {
  margin: 8px 0 0;
  font-size: 14px;
  min-height: 20px;
  letter-spacing: normal;
  text-transform: none;
  font-weight: 400;
  color: var(--ink-soft);
}
.form-status--ok { color: #15803D; }
.form-status--err { color: #B91C1C; }

/* ------- Footer ------- */
.site-footer {
  background: var(--bg);
  color: var(--ink-soft);
  padding: 48px 0 32px;
  border-top: 1px solid var(--border);
}
.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--accent); }

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

.footer-brand {
  font-family: var(--display);
  font-weight: 500;
  font-size: 14px;
  color: var(--ink);
  margin: 0 0 4px;
}

.muted {
  color: var(--muted);
  margin: 4px 0;
  font-size: 13px;
}
.small { font-size: 12px; }

.imprint { padding-top: 32px; }
.imprint h2 {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-family: var(--sans);
}
.imprint p {
  font-size: 13px;
  line-height: 1.7;
  margin: 0 0 16px;
  color: var(--ink-soft);
  max-width: 65ch;
}
.imprint strong { color: var(--ink); font-weight: 500; }

/* ------- Mobile niceties ------- */
@media (max-width: 767px) {
  .brand-text { display: none; }
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 13px; }
  .hero { padding: 64px 0 64px; }
  .section { padding: 64px 0; }
  .card { padding: 24px; }
  .contact-form { padding: 24px; }
  .about-facts { padding: 24px; }
  .contact-list li { grid-template-columns: 80px 1fr; }
}