/* ==========================================================================
   STEINWALD datentechnik — DC-HI-NET Onepager
   Design system: Technical Swiss Grid (industrial B2B, steel blue + red accent)
   ========================================================================== */

/* Schriften: siehe fonts.css (lokal gehostet, kein Google-Fonts-CDN — DSGVO) */

:root {
  /* Brand colors — derived from the original STEINWALD material (steel-blue
     gradient housings, red "CAQ" accent, color-coded protocol arrows) */
  --color-bg: #f3f6f8;
  --color-surface: #ffffff;
  --color-surface-alt: #eef2f5;
  --color-ink: #14212c;
  --color-ink-muted: #526270;
  --color-primary: #16324f;
  --color-primary-dark: #0b1e33;
  --color-primary-light: #2c5580;
  --color-accent: #c31432;
  --color-accent-dark: #970f27;
  --color-border: #dbe3e9;
  --color-border-strong: #b9c6d0;

  /* protocol-family badge colors, matching the original interface diagram */
  --tag-digimatic: #d9791e;
  --tag-rs: #cf4a3c;
  --tag-bcd: #b23a63;
  --tag-analog: #7a5aa6;
  --tag-inductive: #2f6fa8;
  --tag-incremental: #3f8f52;

  --font-head: 'IBM Plex Sans', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(11, 30, 51, 0.08);
  --shadow-md: 0 6px 20px rgba(11, 30, 51, 0.10);
  --shadow-lg: 0 16px 40px rgba(11, 30, 51, 0.16);

  --container: min(1200px, 100% - 2.5rem);
  --section-pad: clamp(3rem, 6vw, 6rem);

  color-scheme: light;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

html { overflow-x: hidden; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
  overflow-x: hidden;
}

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

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 700; line-height: 1.15; margin: 0 0 0.6em; color: var(--color-primary-dark); letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: clamp(1.15rem, 1.6vw, 1.35rem); }
p { margin: 0 0 1em; color: var(--color-ink-muted); max-width: 68ch; }
p:last-child { margin-bottom: 0; }
ul { padding-left: 1.2em; margin: 0 0 1em; }
li { margin-bottom: 0.4em; }
code, .mono { font-family: var(--font-mono); }

a { color: var(--color-primary-light); }
a:focus-visible, button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.container { width: var(--container); margin-inline: auto; }
.section { padding-block: var(--section-pad); }
.section-alt { background: var(--color-surface); }
.section-dark { background: var(--color-primary); color: #fff; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark p { color: #cfdbe6; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-accent);
  margin-bottom: 0.9em;
}
.eyebrow::before { content: ""; width: 1.6em; height: 2px; background: var(--color-accent); display: inline-block; }
/* Auf dunklem Hintergrund (Hero, Kontakt) reicht der normale Rot-Akzent nicht auf 4.5:1 Kontrast (nur 2.16:1) —
   hellerer Rosé-Ton für WCAG AA (ca. 6.6:1) */
.hero .eyebrow, .section-dark .eyebrow { color: #ff9bab; }
.hero .eyebrow::before, .section-dark .eyebrow::before { background: #ff9bab; }

.section-head { max-width: 62ch; margin-bottom: 2.4rem; }
.section-head--center { margin-inline: auto; text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  font-family: var(--font-head); font-weight: 600; font-size: 0.98rem;
  padding: 0.85em 1.6em; border-radius: var(--radius-md);
  border: 2px solid transparent; cursor: pointer; text-decoration: none;
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease, color 150ms ease;
  min-height: 44px;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--color-accent); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-accent-dark); color: #fff; }
.btn-ghost { background: transparent; border-color: rgba(255,255,255,0.5); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,0.12); color: #fff; }
.btn-outline { background: transparent; border-color: var(--color-border-strong); color: var(--color-primary); }
.btn-outline:hover { border-color: var(--color-primary); background: var(--color-surface-alt); }
.btn-sm { padding: 0.5em 1em; font-size: 0.85rem; min-height: 36px; }

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute; left: 1rem; top: -60px; background: var(--color-accent); color: #fff;
  padding: 0.7em 1.2em; border-radius: var(--radius-sm); z-index: 200; transition: top 150ms ease;
  font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.nav-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 0.7rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; }
.brand img { height: 34px; width: auto; }
.brand-name { font-family: var(--font-head); font-weight: 700; color: var(--color-primary-dark); font-size: 1rem; }

.nav-links { display: flex; align-items: center; gap: 1.6rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--color-ink); text-decoration: none; font-weight: 500; font-size: 0.95rem; padding: 0.4em 0; border-bottom: 2px solid transparent; }
.nav-links a:hover { border-color: var(--color-accent); }

.nav-right { display: flex; align-items: center; gap: 0.8rem; }

.lang-switch { display: flex; align-items: center; border: 1px solid var(--color-border-strong); border-radius: 999px; overflow: hidden; }
.lang-switch a, .lang-switch span {
  font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600;
  padding: 0.4em 0.85em; min-height: 32px; display: inline-flex; align-items: center;
}
.lang-switch .lang-link { color: var(--color-ink-muted); text-decoration: none; cursor: pointer; }
.lang-switch .lang-link:hover { background: var(--color-surface-alt); color: var(--color-primary); }
.lang-switch .lang-current { background: var(--color-primary); color: #fff; }

.nav-toggle {
  display: none; background: none; border: none; cursor: pointer; padding: 0.5em;
  min-width: 44px; min-height: 44px; align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 22px; height: 2px; background: var(--color-primary-dark);
  position: relative; transition: transform 150ms ease, opacity 150ms ease;
}
.nav-toggle span::before { position: absolute; top: -7px; }
.nav-toggle span::after { position: absolute; top: 7px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-links {
    position: fixed; inset: 64px 0 auto 0; background: var(--color-surface);
    flex-direction: column; align-items: stretch; gap: 0; padding: 0.5rem 1.25rem 1.25rem;
    box-shadow: var(--shadow-md); transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: transform 180ms ease, opacity 180ms ease; max-height: calc(100vh - 64px); overflow-y: auto;
  }
  .nav-links.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { display: block; padding: 0.9em 0; border-bottom: 1px solid var(--color-border); }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Hero ---------- */
.hero { padding-block: clamp(2.5rem, 7vw, 5.5rem); background:
  radial-gradient(1200px 500px at 85% -10%, #24507c 0%, transparent 60%), var(--color-primary);
  color: #fff; overflow: clip;
}
.hero-grid { display: grid; gap: clamp(2rem, 5vw, 3.5rem); grid-template-columns: 1.05fr 1fr; align-items: center; }
.hero h1 { color: #fff; }
.hero .lede { color: #d7e3ee; font-size: 1.1rem; max-width: 54ch; }
.hero-points { list-style: none; padding: 0; margin: 1.6rem 0 2rem; display: grid; gap: 0.8rem; }
.hero-points li { display: flex; gap: 0.7em; align-items: flex-start; color: #e7eef5; margin: 0; }
.hero-points svg { flex-shrink: 0; margin-top: 0.2em; color: var(--color-accent); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; }
.hero-figure { background: #fff; border-radius: var(--radius-lg); padding: 0.6rem; box-shadow: var(--shadow-lg); }
.hero-figure img { border-radius: var(--radius-md); }
.hero-figure figcaption { font-size: 0.8rem; color: var(--color-ink-muted); padding: 0.6em 0.4em 0.2em; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
}

/* ---------- Protocol badges ---------- */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(150px, 100%), 1fr)); gap: 0.7rem; margin: 1.6rem 0; }
.badge {
  display: flex; align-items: center; gap: 0.6em; padding: 0.7em 0.9em; border-radius: var(--radius-md);
  background: var(--color-surface); border: 1px solid var(--color-border); font-family: var(--font-mono);
  font-size: 0.85rem; font-weight: 600; color: var(--color-ink);
}
.badge::before { content: ""; width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; background: var(--tag-color, var(--color-primary)); }
.badge--digimatic { --tag-color: var(--tag-digimatic); }
.badge--rs { --tag-color: var(--tag-rs); }
.badge--bcd { --tag-color: var(--tag-bcd); }
.badge--analog { --tag-color: var(--tag-analog); }
.badge--inductive { --tag-color: var(--tag-inductive); }
.badge--incremental { --tag-color: var(--tag-incremental); }

.software-target-list { display: flex; flex-wrap: wrap; gap: 0.6rem; list-style: none; padding: 0; margin: 1.2rem 0; }
.software-target-list li {
  background: var(--color-surface-alt); border: 1px solid var(--color-border); border-radius: 999px;
  padding: 0.5em 1.1em; font-weight: 600; font-size: 0.9rem; color: var(--color-primary-dark); margin: 0;
}

.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.split img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }

.feature-list { list-style: none; padding: 0; margin: 1.2rem 0; }
.feature-list li { display: flex; gap: 0.7em; align-items: flex-start; }
.feature-list svg { flex-shrink: 0; margin-top: 0.25em; color: var(--color-accent); }

.protocol-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.6rem; box-shadow: var(--shadow-sm); }

/* ---------- Product cards ---------- */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); gap: 1.4rem; margin-top: 2rem; }
.product-card {
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 1.7rem; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; gap: 0.9rem;
}
.product-card__icon {
  width: 46px; height: 46px; border-radius: var(--radius-md); background: var(--color-primary);
  color: #fff; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.product-card h3 { margin-bottom: 0; }
.product-card .tagline { font-family: var(--font-mono); font-size: 0.82rem; color: var(--color-accent); font-weight: 600; }
.product-card__variants { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.4rem; }
.product-card__variants span {
  font-family: var(--font-mono); font-size: 0.72rem; background: var(--color-surface-alt); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); padding: 0.25em 0.55em; color: var(--color-primary-dark);
}
.product-card details { margin-top: 0.3rem; }
.product-card summary { cursor: pointer; font-weight: 600; color: var(--color-primary); font-size: 0.92rem; list-style: none; display: flex; align-items: center; gap: 0.4em; }
.product-card summary::-webkit-details-marker { display: none; }
.product-card summary::before { content: "+"; font-family: var(--font-mono); width: 1.2em; text-align: center; }
.product-card details[open] summary::before { content: "–"; }

/* ---------- Sender gallery ---------- */
.sender-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(150px, 100%), 1fr)); gap: 0.9rem; margin: 1.4rem 0; }
.sender-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 0.7rem; text-align: center; }
.sender-item img { margin-inline: auto; max-height: 60px; width: auto; object-fit: contain; }
.sender-item figcaption { font-size: 0.74rem; color: var(--color-ink-muted); margin-top: 0.5em; line-height: 1.35; }

/* ---------- Tool cards ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); gap: 1.2rem; margin-top: 1.6rem; }
.tool-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.5rem; box-shadow: var(--shadow-sm); }
.tool-card h3 { font-family: var(--font-mono); font-size: 1.05rem; }

/* ---------- Service cards ---------- */
.service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); gap: 1.4rem; margin-top: 1.8rem; }
.service-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.8rem; box-shadow: var(--shadow-sm); }
.price-tag { font-family: var(--font-mono); font-weight: 600; color: var(--color-accent); display: block; margin-top: 1rem; font-size: 0.9rem; }

/* ---------- Tips / accordion ---------- */
.tips-list { display: grid; gap: 0.8rem; margin-top: 1.6rem; }
.tip-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.tip-item summary { cursor: pointer; padding: 1rem 1.2rem; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1em; align-items: center; }
.tip-item summary::-webkit-details-marker { display: none; }
.tip-item summary::after { content: "+"; font-family: var(--font-mono); font-size: 1.1rem; color: var(--color-accent); }
.tip-item[open] summary::after { content: "–"; }
.tip-item .tip-body { padding: 0 1.2rem 1.1rem; margin: 0; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 0.8rem; margin-top: 1.6rem; max-width: 78ch; }
.faq-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.faq-item summary { cursor: pointer; padding: 1rem 1.2rem; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1em; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-family: var(--font-mono); font-size: 1.1rem; color: var(--color-accent); flex-shrink: 0; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding: 0 1.2rem 1.1rem; margin: 0; }

/* ---------- Download list ---------- */
.download-list { list-style: none; padding: 0; margin: 1.6rem 0; display: grid; gap: 0.9rem; }
.download-list li {
  display: flex; align-items: center; gap: 1em; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: 1rem 1.2rem;
}
.download-list .dl-icon { width: 38px; height: 38px; border-radius: var(--radius-sm); background: var(--color-surface-alt); color: var(--color-primary); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.download-list strong { display: block; color: var(--color-ink); font-family: var(--font-mono); font-size: 0.92rem; }
.download-list span { font-size: 0.85rem; color: var(--color-ink-muted); }

/* ---------- Contact / footer ---------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 5vw, 4rem); }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.8rem; box-shadow: var(--shadow-sm); }
.contact-card address { font-style: normal; line-height: 1.8; }
.contact-card a { color: var(--color-primary); font-weight: 600; text-decoration: none; }
.contact-card a:hover { text-decoration: underline; }

.legal-block { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.6rem 1.8rem 1.8rem; margin-top: 1.4rem; max-width: 78ch; }
.legal-block .demo-flag { display: inline-block; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; background: #fdf1d6; color: #8a5a00; border-radius: 999px; padding: 0.3em 0.8em; margin-bottom: 0.9em; }
.legal-block h3 { color: var(--color-primary-dark); }
.legal-block h4 { font-size: 0.98rem; color: var(--color-primary-dark); margin: 1.3rem 0 0.4em; }
.legal-block h4:first-of-type { margin-top: 0.4rem; }
.legal-block p, .legal-block li { color: var(--color-ink-muted); font-size: 0.9rem; max-width: none; }
.legal-block ul { margin: 0.4rem 0 0.9rem 1.1rem; padding: 0; }
.legal-block address { font-style: normal; }
.legal-block .tbd { background: #fdf1d6; color: #8a5a00; font-family: var(--font-mono); font-size: 0.82em; padding: 0.1em 0.45em; border-radius: 4px; white-space: normal; }
.legal-block .legal-disclaimer { margin-top: 1.4rem; padding-top: 1rem; border-top: 1px dashed var(--color-border); font-size: 0.82rem; font-style: italic; }

.site-footer { background: var(--color-primary-dark); color: #c9d6e2; padding-block: 3rem 2rem; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); gap: 2rem; margin-bottom: 2rem; }
.footer-grid h3 { color: #fff; font-size: 0.95rem; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 0.5em; }
.footer-grid a { text-decoration: none; color: #c9d6e2; }
.footer-grid a:hover { color: #fff; text-decoration: underline; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 1.4rem; display: flex; flex-wrap: wrap; gap: 0.8rem 1.6rem; justify-content: space-between; font-size: 0.82rem; }

/* ---------- Cookie banner ---------- */
.cookie-banner {
  position: fixed; left: 50%; bottom: 1rem; z-index: 300;
  width: calc(100% - 2rem); max-width: 760px; transform: translateX(-50%);
  background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: 1.4rem 1.6rem; display: grid; gap: 1rem;
}
.cookie-banner[hidden] { display: none; }
.cookie-banner p { font-size: 0.9rem; margin: 0; }
.cookie-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; }

/* ---------- Utility ---------- */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
[data-lang="en"][hidden], [data-lang="de"][hidden] { display: none !important; }
.stand-date { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-ink-muted); }

@media (max-width: 480px) {
  .cookie-banner { width: calc(100% - 1.2rem); bottom: 0.6rem; padding: 1.1rem 1.2rem; }
}