/* Layout: ruhige Einspalten-Seite, Hero mit "Patchfeld" als Leistungs-Überblick; nur Systemschriften (keine externen Server, DSGVO). */
:root {
  --bg: #f4f6f8; --surface: #ffffff; --ink: #142230; --muted: #566676;
  --line: #d8dee5; --accent: #1d5ba6; --accent-ink: #ffffff; --led: #23955a;
  --mark: #fff1b8; --rack: #1b2a38; --rack-ink: #d6e1ec; --rack-line: #2f4256;
  --f-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --f-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --f-mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0f1820; --surface: #16222d; --ink: #e5ecf2; --muted: #9aabbb;
  --line: #273746; --accent: #6aa8ee; --accent-ink: #0b1622; --led: #4cc883;
  --mark: #4a3f12; --rack: #0b131a; --rack-ink: #c7d4e0; --rack-line: #263544; color-scheme: dark } }
:root[data-theme="dark"] {
  --bg: #0f1820; --surface: #16222d; --ink: #e5ecf2; --muted: #9aabbb;
  --line: #273746; --accent: #6aa8ee; --accent-ink: #0b1622; --led: #4cc883;
  --mark: #4a3f12; --rack: #0b131a; --rack-ink: #c7d4e0; --rack-line: #263544; color-scheme: dark }

* { box-sizing: border-box }
html { scroll-behavior: smooth }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--f-body);
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.wrap { max-width: 1080px; margin: 0 auto }
.narrow { max-width: 760px }
a { color: var(--accent) }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px }
h1, h2, h3 { font-family: var(--f-display); text-wrap: balance; line-height: 1.15; margin: 0 }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; letter-spacing: -0.02em }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 650; letter-spacing: -0.01em }
h3 { font-size: 1.125rem; font-weight: 650 }
.kicker { font: 600 0.75rem/1 var(--f-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 14px; display: flex; align-items: center; gap: 8px }
.led { width: 8px; height: 8px; border-radius: 50%; background: var(--led); box-shadow: 0 0 0 3px color-mix(in srgb, var(--led) 25%, transparent) }

/* Kopfzeile */
.top { border-bottom: 1px solid var(--line) }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 16px; flex-wrap: wrap }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font: 600 1.05rem var(--f-display) }
.brand b { color: var(--accent) }
.mark { display: grid; grid-template-columns: repeat(3, 6px); gap: 3px; padding: 5px; border-radius: 4px; background: var(--rack) }
.mark i { height: 6px; border-radius: 1px; background: var(--led) }
.mark i:nth-child(2) { background: var(--rack-ink) }
.top nav { display: flex; gap: 20px; flex-wrap: wrap }
.top nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem }
.top nav a:hover { color: var(--ink) }

/* Hero */
.hero { padding-block: clamp(40px, 8vw, 88px) }
.hgrid { display: grid; grid-template-columns: 1.25fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: center }
.htext { min-width: 0 }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 58ch; margin: 18px 0 0 }
.lead.small { font-size: 1.05rem }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px }
.btn { display: inline-block; padding: 12px 20px; border-radius: 6px; background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 600 }
.btn:hover { filter: brightness(1.08) }
.btn.ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--line) }
.btn.ghost:hover { box-shadow: inset 0 0 0 1px var(--muted) }

.rack { background: var(--rack); color: var(--rack-ink); border-radius: 10px; padding: 16px; font-family: var(--f-mono); font-size: 0.9rem; min-width: 0 }
.rack-h { display: flex; justify-content: space-between; gap: 8px; font-size: 0.68rem; letter-spacing: 0.14em; opacity: .65; padding-bottom: 12px; border-bottom: 1px dashed var(--rack-line); margin-bottom: 6px }
.rack ul { list-style: none; margin: 0; padding: 0 }
.rack li { display: flex; align-items: center; gap: 12px; padding: 10px 4px; border-bottom: 1px solid var(--rack-line) }
.rack li:last-child { border-bottom: 0 }
.rack code { font: inherit; opacity: .5; font-variant-numeric: tabular-nums }
.rack em { font-style: normal; opacity: .6 }
.port { flex: none; width: 18px; height: 12px; border-radius: 2px; border: 1px solid var(--rack-line); position: relative }
.port.on::after { content: ""; position: absolute; right: 2px; top: 2px; width: 4px; height: 4px; border-radius: 50%; background: var(--led) }
@media (prefers-reduced-motion: no-preference) { .port.on::after { animation: blink 3.2s infinite } .rack li:nth-child(2) .port::after { animation-delay: .7s } .rack li:nth-child(4) .port::after { animation-delay: 1.9s } }
@keyframes blink { 0%, 86%, 100% { opacity: 1 } 90% { opacity: .2 } }

/* Abschnitte */
.block { padding-block: clamp(48px, 8vw, 80px); border-top: 1px solid var(--line) }
.block.alt { background: var(--surface); margin-inline: calc(-1 * max(16px, env(safe-area-inset-left, 0px))); padding-inline: max(16px, env(safe-area-inset-left, 0px)) }
.block h2 { margin-bottom: 28px }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 22px; display: flex; flex-direction: column; gap: 10px }
.card p { margin: 0; color: var(--muted) }
.card .meta { margin-top: auto; padding-top: 10px; border-top: 1px solid var(--line); font: 0.8rem var(--f-mono); color: var(--ink) }
.note { color: var(--muted); font-size: 0.95rem; margin: 22px 0 0 }

.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px }
.steps li { counter-increment: s; border-top: 2px solid var(--accent); padding-top: 14px }
.steps li::before { content: "0" counter(s); font: 600 0.8rem var(--f-mono); color: var(--accent); display: block; margin-bottom: 6px }
.steps p { margin: 6px 0 0; color: var(--muted) }

.kgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start }
.contact { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; min-width: 0 }
.row { display: grid; grid-template-columns: 110px minmax(0, 1fr) auto; gap: 12px; align-items: baseline; padding: 18px 20px; border-bottom: 1px solid var(--line) }
.row:last-child { border-bottom: 0 }
.lbl { font: 600 0.72rem var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted) }
.val { overflow-wrap: anywhere; font-size: 1.05rem }
.copy { font: 0.8rem var(--f-body); padding: 6px 10px; border-radius: 5px; border: 1px solid var(--line); background: transparent; color: var(--ink); cursor: pointer }
.copy:hover { border-color: var(--muted) }

/* Rechtstexte */
.legal { padding-block: clamp(36px, 6vw, 64px) }
.legal h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); margin-bottom: 24px }
.prose { max-width: 68ch }
.prose h2 { font-size: 1.2rem; margin: 36px 0 10px }
.prose p, .prose li { color: var(--ink) }
.prose p { margin: 0 0 12px }
.prose ul { padding-left: 1.2em }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0 }
.tw { overflow-x: auto; margin: 8px 0 16px }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; min-width: 520px }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line) }
.prose th { font: 600 0.75rem var(--f-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted) }
mark { background: var(--mark); color: var(--ink); padding: 0 3px; border-radius: 3px }

/* Fußzeile */
.foot { border-top: 1px solid var(--line); padding-block: 28px; color: var(--muted); font-size: 0.9rem }
.fgrid { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap }
.foot strong { color: var(--ink) }
.foot nav { display: flex; gap: 20px; flex-wrap: wrap; align-items: flex-start }
.foot a { color: var(--muted) }
.foot a:hover { color: var(--ink) }

@media (max-width: 820px) {
  .hgrid, .kgrid { grid-template-columns: 1fr }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)) }
}
@media (max-width: 560px) {
  .cards, .steps { grid-template-columns: 1fr }
  .row { grid-template-columns: 1fr auto }
  .row .lbl { grid-column: 1 / -1 }
  .top nav { gap: 14px }
}
.form-box { border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; background: var(--surface); margin: 8px 0 16px }
.form-box ul { list-style: none; padding: 0 } .form-box li { padding: 4px 0 }
.hero.quiet { padding-block: clamp(32px, 6vw, 64px) }
.doclist { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line) }
.doclist li { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 14px 0; border-bottom: 1px solid var(--line) }
.doclist a { font-weight: 600; text-decoration: none } .doclist a:hover { text-decoration: underline }
.doclist span { font: 0.8rem var(--f-mono); color: var(--muted) }
.led.err { background: #c2410c; box-shadow: 0 0 0 3px color-mix(in srgb, #c2410c 25%, transparent) }
.about p { margin: 0 0 12px; max-width: 58ch }
.projlist { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line) }
.projlist li { padding: 14px 0; border-bottom: 1px solid var(--line); display: grid; gap: 4px }
.projlist span { color: var(--muted) }