/* ============================================================
   site.css — Base layer for all 12 company sites
   Skin-agnostic: layout, structure, reset, typography rhythm.
   Each skin (software/luxus/solar) overrides tokens.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body, "Inter", system-ui, sans-serif);
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 4px; }

/* ────── Layout primitives ────── */
.container {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}
.section { padding-block: clamp(64px, 9vw, 120px); }
.section-tight { padding-block: clamp(40px, 6vw, 72px); }

/* ────── Navigation ────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--nav-bg, var(--bg));
  border-bottom: 1px solid var(--border-subtle, transparent);
  backdrop-filter: var(--nav-blur, none);
  -webkit-backdrop-filter: var(--nav-blur, none);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  max-width: 1180px; margin-inline: auto;
  padding: 16px clamp(20px, 4vw, 40px);
  min-height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
  font-weight: var(--brand-weight, 700);
  font-size: var(--brand-size, 17px);
  color: var(--fg);
  letter-spacing: var(--brand-track, -0.01em);
  white-space: nowrap;
}
.brand svg { flex-shrink: 0; }
.nav-links {
  display: flex; align-items: center; gap: clamp(20px, 3vw, 36px);
  font-size: 15px;
}
.nav-links a {
  color: var(--fg-muted);
  transition: color 180ms ease;
  position: relative;
  padding-block: 4px;
}
.nav-links a:hover { color: var(--fg); }
.nav-links a[aria-current="page"] {
  color: var(--fg);
}
.nav-links a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--primary); border-radius: 1px;
}
.nav-aside { display: flex; align-items: center; gap: 16px; }
.lang-switch {
  display: inline-flex; gap: 0;
  font-family: var(--font-mono, "JetBrains Mono", ui-monospace, monospace);
  font-size: 12px;
  letter-spacing: 0.08em;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch a {
  padding: 6px 11px;
  color: var(--fg-muted);
  transition: all 180ms ease;
}
.lang-switch a:hover { color: var(--fg); }
.lang-switch a[aria-current="true"] {
  background: var(--primary);
  color: var(--on-primary);
}
.nav-toggle {
  display: none;
  background: none; border: none; padding: 8px;
  color: var(--fg);
}

/* Mobile nav */
@media (max-width: 760px) {
  .nav-links {
    position: fixed; inset: 64px 0 0 0;
    background: var(--bg);
    flex-direction: column; align-items: stretch;
    gap: 0;
    padding: 24px;
    transform: translateX(100%);
    transition: transform 240ms ease;
    z-index: 40;
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links a { padding: 14px 4px; border-bottom: 1px solid var(--border-subtle); font-size: 17px; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-aside { gap: 8px; }
}

/* ────── Hero ────── */
.hero {
  padding-block: clamp(72px, 11vw, 140px);
  position: relative;
  overflow: hidden;
}
.hero-eyebrow {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--primary);
  margin-bottom: 24px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, var(--hero-size, 4rem));
  line-height: var(--hero-lh, 1.05);
  letter-spacing: var(--hero-track, -0.025em);
  font-weight: var(--hero-weight, 700);
  margin: 0 0 24px 0;
  color: var(--fg);
  text-wrap: balance;
  max-width: var(--hero-max, 18ch);
}
.hero h1 em {
  font-style: normal;
  color: var(--primary);
}
.hero-sub {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  color: var(--fg-muted);
  margin: 0 0 36px 0;
  max-width: 56ch;
  text-wrap: pretty;
  line-height: 1.55;
}
.hero-cta-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ────── Buttons ────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  min-height: 48px;
  border-radius: var(--btn-radius, 10px);
  font-weight: 500;
  font-size: 15px;
  border: 1px solid transparent;
  transition: background 180ms ease, border-color 180ms ease, transform 120ms ease, color 180ms ease;
  white-space: nowrap;
  text-decoration: none;
  letter-spacing: var(--btn-track, 0);
}
.btn:active { transform: scale(0.985); }
.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border-strong);
}
.btn-ghost:hover { border-color: var(--fg); }
.btn-arrow::after {
  content: "→";
  transition: transform 200ms ease;
  font-size: 1.1em;
  line-height: 1;
}
.btn-arrow:hover::after { transform: translateX(3px); }

/* ────── Section heads ────── */
.eyebrow {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--primary);
  margin: 0 0 16px 0;
}
.section-head {
  max-width: 720px;
  margin-bottom: clamp(40px, 5vw, 64px);
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: var(--hero-weight, 700);
  margin: 0 0 16px 0;
  color: var(--fg);
  text-wrap: balance;
}
.section-head p {
  font-size: 1.05rem;
  color: var(--fg-muted);
  margin: 0;
  max-width: 56ch;
  line-height: 1.55;
}

/* ────── Cards / Tiles ────── */
.tile-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.tile {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--card-radius, 14px);
  transition: border-color 200ms ease, transform 200ms ease, background 200ms ease;
}
.tile:hover {
  border-color: var(--border-strong);
}
.tile-icon {
  width: 44px; height: 44px;
  margin-bottom: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: var(--icon-radius, 10px);
}
.tile h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: var(--hero-weight, 700);
  margin: 0 0 10px 0;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.tile p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--fg-muted);
}

/* ────── Process list (4-step "How we work") ────── */
.process-list {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(28px, 4vw, 48px);
  counter-reset: ps;
  position: relative;
}
.process-step {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  counter-increment: ps;
}
.process-step .step-num {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 500;
}
.process-step h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: var(--hero-weight, 600);
  margin: 0 0 8px 0;
  color: var(--fg);
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.process-step p {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--fg-muted);
  margin: 0;
}

/* ────── Value row (3 stat-ish columns) ────── */
.value-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(32px, 5vw, 56px);
}
.value-item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: var(--hero-weight, 700);
  margin: 0 0 8px 0;
  color: var(--fg);
}
.value-item .num {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3rem);
  font-weight: var(--hero-weight, 700);
  line-height: 1;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.value-item p { font-size: 0.95rem; color: var(--fg-muted); margin: 0; }

/* ────── CTA banner ────── */
.cta-banner {
  padding: clamp(40px, 6vw, 64px);
  background: var(--cta-bg, var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--card-radius, 14px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.cta-banner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: var(--hero-weight, 700);
  margin: 0;
  color: var(--fg);
  letter-spacing: -0.015em;
  max-width: 26ch;
  text-wrap: balance;
}
.cta-banner .cta-text { display: flex; flex-direction: column; gap: 10px; flex: 1 1 380px; min-width: 0; }
.cta-banner .cta-text .eyebrow { margin: 0; }
.cta-banner .cta-sub {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 56ch;
  text-wrap: pretty;
}
.cta-banner .cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.cta-banner .cta-actions .cta-mail {
  font-size: 0.92rem;
  color: var(--fg-muted);
  font-family: var(--font-mono, monospace);
  letter-spacing: 0.02em;
}
.cta-banner .cta-actions .cta-mail:hover { color: var(--fg); }

/* ────── About section (homepage) ────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}
@media (max-width: 760px) { .about-grid { grid-template-columns: 1fr; } }
.about-text p.lede {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.2vw, 1.55rem);
  line-height: 1.35;
  color: var(--fg);
  margin: 0 0 22px 0;
  font-weight: var(--hero-weight, 600);
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.about-text p { font-size: 1rem; color: var(--fg-muted); line-height: 1.65; margin: 0 0 16px 0; max-width: 60ch; }
.about-meta {
  border-left: 1px solid var(--border);
  padding-left: clamp(20px, 3vw, 32px);
}
@media (max-width: 760px) {
  .about-meta { border-left: 0; border-top: 1px solid var(--border); padding: 24px 0 0 0; }
}
.about-meta h3 {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--fg-subtle);
  margin: 0 0 6px 0;
  font-weight: 600;
}
.about-meta p { margin: 0 0 22px 0; color: var(--fg); font-size: 0.97rem; line-height: 1.5; }
.about-meta p:last-child { margin-bottom: 0; }

/* ────── Legal-certainty timeline (SKN-style, software sites) ────── */
.legal-timeline {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  counter-reset: lt;
}
.legal-timeline li {
  position: relative;
  padding: 28px 24px 24px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--card-radius, 14px);
  counter-increment: lt;
}
.legal-timeline li::before {
  content: counter(lt, decimal-leading-zero);
  position: absolute; top: 14px; right: 18px;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
}
.legal-timeline .legal-date {
  font-family: var(--font-mono, monospace);
  font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}
.legal-timeline .legal-court {
  font-size: 12px; color: var(--fg-subtle);
  margin-bottom: 16px;
}
.legal-timeline h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: var(--hero-weight, 600);
  letter-spacing: -0.01em;
  margin: 0 0 10px 0; color: var(--fg);
  text-wrap: balance;
}
.legal-timeline p {
  margin: 0; font-size: 0.93rem;
  color: var(--fg-muted); line-height: 1.55;
}

/* ────── Forms ────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(32px, 6vw, 64px);
  align-items: start;
}
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; } }

.info-block h3 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-subtle);
  margin: 0 0 8px 0;
  font-weight: 600;
}
.info-block p { margin: 0 0 28px 0; color: var(--fg); font-size: 1rem; line-height: 1.55; }
.info-block a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.info-block a:hover { color: var(--primary-hover); }

form.contact-form { display: grid; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 13px;
  color: var(--fg-muted);
  font-weight: 500;
}
.field input,
.field textarea {
  font: inherit;
  padding: 12px 14px;
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--input-radius, 8px);
  transition: border-color 180ms ease, background 180ms ease;
  min-height: 48px;
}
.field textarea { resize: vertical; min-height: 140px; line-height: 1.5; }
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--surface-hover, var(--surface));
}
.field input::placeholder,
.field textarea::placeholder { color: var(--fg-subtle); }

/* Invalid state — red border + inline message */
.field.is-invalid input,
.field.is-invalid textarea {
  border-color: var(--danger, #DC2626);
  background: var(--danger-soft, rgba(220, 38, 38, 0.04));
}
.field.is-invalid input:focus,
.field.is-invalid textarea:focus {
  border-color: var(--danger, #DC2626);
  box-shadow: 0 0 0 3px var(--danger-soft, rgba(220, 38, 38, 0.12));
}
.field-error {
  font-size: 13px;
  color: var(--danger, #DC2626);
  margin: 4px 0 0 0;
  min-height: 1px;
  line-height: 1.4;
}
.field-error:empty { display: none; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 540px) { .form-row { grid-template-columns: 1fr; } }
.form-note { font-size: 13px; color: var(--fg-subtle); margin: 4px 0 0 0; }
.form-success {
  display: none;
  padding: 16px 18px;
  background: var(--success-soft, rgba(34, 197, 94, 0.1));
  border: 1px solid var(--success, #22c55e);
  border-radius: var(--input-radius, 8px);
  color: var(--fg);
  font-size: 14px;
}
.form-success.is-visible { display: block; }

/* ────── Legal pages (Impressum, Datenschutz) ────── */
.legal {
  max-width: 760px;
}
.legal h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 12px 0;
  font-weight: var(--hero-weight, 700);
  color: var(--fg);
}
.legal .lede {
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin: 0 0 48px 0;
}
.legal h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: var(--hero-weight, 700);
  margin: 40px 0 12px 0;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.legal h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 28px 0 8px 0;
  color: var(--fg);
}
.legal p, .legal li {
  font-size: 0.97rem;
  line-height: 1.65;
  color: var(--fg-muted);
  margin: 0 0 12px 0;
}
.legal ul { padding-left: 22px; margin: 0 0 18px 0; }
.legal li { margin-bottom: 6px; }
.legal a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.legal strong { color: var(--fg); font-weight: 600; }
.legal address {
  font-style: normal;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--card-radius, 14px);
  padding: 20px 22px;
  margin: 8px 0 24px 0;
  font-size: 0.97rem;
  line-height: 1.6;
}

/* ────── Footer ────── */
.site-footer {
  border-top: 1px solid var(--border-subtle, var(--border));
  background: var(--footer-bg, var(--bg));
  margin-top: 80px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 56px clamp(20px, 4vw, 40px) 40px;
  max-width: 1180px;
  margin-inline: auto;
}
@media (max-width: 760px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; padding: 48px 24px 32px; }
}
@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-subtle);
  margin: 0 0 14px 0;
  font-weight: 600;
}
.footer-col p, .footer-col li, .footer-col a {
  font-size: 0.92rem;
  color: var(--fg-muted);
  line-height: 1.6;
  margin: 0 0 6px 0;
}
.footer-col a:hover { color: var(--fg); }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col .brand { font-size: 1rem; margin-bottom: 10px; }
.footer-bottom {
  border-top: 1px solid var(--border-subtle, var(--border));
  padding: 20px clamp(20px, 4vw, 40px);
  max-width: 1180px;
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--fg-subtle);
}

/* ────── Misc utilities ────── */
.divider { height: 1px; background: var(--border); margin-block: 48px; border: none; }
.text-mono { font-family: var(--font-mono, monospace); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}