/* Knotenwerk IT — Demo von FatCat Digital
   Dunkel, technisch-präzise: Raster, Monospace-Akzente, 1-px-Linien. */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/inter-german.woff2") format("woff2");
}
@font-face {
  font-family: "JB Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/jetbrains-mono-regular.woff2") format("woff2");
}
@font-face {
  font-family: "JB Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/jetbrains-mono-medium.woff2") format("woff2");
}

:root {
  --bg: #0a0d10;
  --bg-2: #0f1418;
  --bg-3: #141b21;
  --line: #1e2830;
  --line-2: #2b3843;
  --text: #e7edf2;
  --muted: #94a3b0;      /* 7.4:1 auf --bg */
  --dim: #7d8c99;        /* >=4.9:1 auf allen Flächen */
  --accent: #5eead4;
  --accent-ink: #04201b;
  --warn: #fbbf24;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "JB Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  --wrap: 77.5rem;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 4px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 120px; }
body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
  background-position: -1px -1px;
  background-attachment: fixed;
  color: var(--text);
  font: 400 1rem/1.6 var(--sans);
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
/* Raster nur angedeutet: Schleier darüber */
body::before {
  content: "";
  position: fixed; inset: 0;
  background: radial-gradient(ellipse at 70% 0%, rgba(10,13,16,.55), rgba(10,13,16,.92) 60%);
  pointer-events: none;
  z-index: -1;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
::selection { background: var(--accent); color: var(--accent-ink); }

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

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip {
  position: absolute; left: 16px; top: -100px; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: 8px 14px; font-weight: 600;
}
.skip:focus { top: 16px; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.muted { color: var(--muted); }
.dim { color: var(--dim); }

/* ---------- Kopf: Demo-Leiste + Navigation ---------- */
.top { position: sticky; top: 0; z-index: 50; }

.demobar {
  background: #000;
  border-bottom: 1px solid var(--line);
  font: 400 .75rem/1.45 var(--mono);
  color: var(--muted);
  text-align: center;
  padding: 7px 16px;
}
.demobar p { display: flex; flex-wrap: wrap; justify-content: center; gap: 2px 12px; }
.demobar__tag {
  color: var(--accent-ink); background: var(--accent);
  padding: 0 6px; border-radius: 2px; font-weight: 500; margin-right: 2px;
}
.demobar a { color: var(--accent); text-underline-offset: 3px; }
.demobar a:hover { color: #fff; }
@media (max-width: 40rem) {
  .demobar { font-family: "Inter", system-ui, sans-serif; padding: 6px 12px; }
  .demobar p { display: block; }
  .demobar a { display: block; }
}

.header {
  background: rgba(10, 13, 16, .86);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand__name { font: 500 1.02rem/1 var(--mono); letter-spacing: -0.02em; }
.brand__it { color: var(--accent); }

.nav ul { display: flex; align-items: center; gap: 4px; }
.nav a {
  display: inline-flex; align-items: baseline; gap: 6px;
  padding: 8px 12px; text-decoration: none; color: var(--muted);
  font-size: .9rem; border-radius: var(--radius);
  transition: color .2s, background-color .2s;
}
.nav a:hover { color: var(--text); background: var(--bg-3); }
.nav__n { font: 400 .7rem var(--mono); color: var(--dim); }
.nav .nav__cta {
  margin-left: 8px; color: var(--text);
  border: 1px solid var(--line-2);
}
.nav .nav__cta:hover { border-color: var(--accent); color: var(--accent); background: transparent; }

.navtoggle { display: none; }

@media (max-width: 860px) {
  .navtoggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 44px; height: 44px; background: none; border: 1px solid var(--line-2);
    border-radius: var(--radius); color: var(--text); cursor: pointer;
  }
  .navtoggle__bars, .navtoggle__bars::before, .navtoggle__bars::after {
    display: block; width: 18px; height: 1.5px; background: currentColor; position: relative;
    transition: transform .25s, background-color .25s;
  }
  .navtoggle__bars::before, .navtoggle__bars::after { content: ""; position: absolute; left: 0; }
  .navtoggle__bars::before { top: -6px; }
  .navtoggle__bars::after { top: 6px; }
  .navtoggle[aria-expanded="true"] .navtoggle__bars { background: transparent; }
  .navtoggle[aria-expanded="true"] .navtoggle__bars::before { transform: translateY(6px) rotate(45deg); }
  .navtoggle[aria-expanded="true"] .navtoggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

  .nav {
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--bg); border-bottom: 1px solid var(--line);
    display: none;
  }
  /* ohne JS bleibt das Menü sichtbar */
  .nav.is-open, html:not(.js) .nav { display: block; position: static; }
  .nav ul { flex-direction: column; align-items: stretch; gap: 0; padding: 8px var(--gutter) 16px; }
  .nav a { padding: 14px 4px; border-bottom: 1px solid var(--line); border-radius: 0; font-size: 1rem; }
  .nav .nav__cta { margin: 12px 0 0; justify-content: center; border-radius: var(--radius); }
  html:not(.js) .navtoggle { display: none; }
  html:not(.js) .header__inner { height: auto; flex-wrap: wrap; padding-top: 12px; padding-bottom: 4px; }
  html:not(.js) .nav { width: 100%; }
  .header { position: relative; }
}

/* ---------- Grundbausteine ---------- */
.eyebrow, .sechead__n {
  display: inline-flex; align-items: center; gap: 10px;
  font: 400 .78rem/1.4 var(--mono); color: var(--accent);
  letter-spacing: .02em; text-transform: lowercase;
}
.dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px rgba(94, 234, 212, .14);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 12px 22px;
  font: 500 .95rem/1.2 var(--sans); text-decoration: none;
  border-radius: var(--radius); border: 1px solid transparent; cursor: pointer;
  transition: background-color .2s, color .2s, border-color .2s, transform .2s;
}
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: #99f6e4; }
.btn span { font-family: var(--mono); }
.btn--primary span { transition: transform .2s; }
.btn--primary:hover span { transform: translateX(3px); }
.btn--ghost { border-color: var(--line-2); color: var(--text); background: rgba(15, 20, 24, .6); }
.btn--ghost:hover { border-color: var(--muted); }

.ticks li {
  position: relative; padding-left: 20px;
  font: 400 .8rem/1.5 var(--mono); color: var(--muted);
}
.ticks li + li { margin-top: 6px; }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 9px; height: 1px; background: var(--accent);
}

/* ---------- Hero ---------- */
.hero { padding: clamp(48px, 8vw, 104px) 0 clamp(56px, 8vw, 112px); border-bottom: 1px solid var(--line); }
.hero__grid { display: grid; gap: clamp(40px, 5vw, 72px); align-items: center; }
@media (min-width: 1024px) { .hero__grid { grid-template-columns: 1fr 1.05fr; } }

.hero__title {
  margin-top: 22px;
  font-size: clamp(2.35rem, 1.4rem + 4.2vw, 4.4rem);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.02;
}
.hero__lead { margin-top: 24px; max-width: 34em; color: var(--muted); font-size: clamp(1rem, .95rem + .3vw, 1.15rem); }
.hero__actions { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 12px; }
@media (max-width: 420px) { .hero__actions .btn { width: 100%; } }

.spec {
  margin: 40px 0 0; display: grid; border-top: 1px solid var(--line);
}
.spec > div {
  display: grid; grid-template-columns: 9.5em 1fr; gap: 12px;
  padding: 11px 0; border-bottom: 1px solid var(--line);
  font-size: .9rem;
}
.spec dt { font: 400 .75rem/1.9 var(--mono); color: var(--dim); text-transform: lowercase; }
.spec dd { margin: 0; color: var(--text); }
@media (max-width: 400px) { .spec > div { grid-template-columns: 1fr; gap: 0; } }

.hero__diagram { margin: 0; }
.diagram__frame {
  border: 1px solid var(--line-2); border-radius: 6px;
  background: linear-gradient(180deg, rgba(20, 27, 33, .9), rgba(10, 13, 16, .9));
  overflow: hidden;
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, .9), 0 0 0 1px rgba(255,255,255,.02) inset;
}
.diagram__bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; border-bottom: 1px solid var(--line);
  font: 400 .72rem var(--mono); color: var(--dim);
}
.diagram__live { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); }
.diagram__live i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.diagram__cap { margin-top: 14px; font: 400 .75rem/1.6 var(--mono); color: var(--dim); max-width: 60ch; }

.net { width: 100%; height: auto; }
.net__dot { fill: #22303a; }
.link { stroke: var(--line-2); stroke-width: 1.5; fill: none; }
.link--dash { stroke: var(--accent); stroke-opacity: .55; stroke-dasharray: 4 5; }
.node rect { fill: var(--bg-2); stroke: var(--line-2); stroke-width: 1; }
.node--accent rect { stroke: var(--accent); stroke-opacity: .7; }
.node--core rect { fill: var(--accent); stroke: var(--accent); }
.node--core .node__v { fill: var(--accent-ink); font-weight: 500; }
.node__k { font: 400 11px var(--mono); fill: var(--dim); }
.node__v { font: 400 12px var(--mono); fill: var(--text); }
.node--accent .node__k { fill: var(--accent); }
.node__led { fill: var(--accent); }
.packet { fill: var(--accent); }
.packet--warm { fill: #e7edf2; }

/* ---------- Sektionen ---------- */
.section { padding: clamp(72px, 10vw, 136px) 0; }
.section--line { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(15, 20, 24, .55); }

.sechead { max-width: 760px; margin-bottom: clamp(40px, 5vw, 64px); }
.sechead h2, .monitor__text h2, .contact__info h2 {
  margin-top: 16px;
  font-size: clamp(1.8rem, 1.2rem + 2.4vw, 3rem);
  letter-spacing: -0.03em;
}
.sechead__lead { margin-top: 18px; color: var(--muted); font-size: 1.05rem; max-width: 40em; }

/* Leistungen: Karten mit Haarlinien (Gap-Trick) */
.cards {
  display: grid; gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden;
}
@media (min-width: 680px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card {
  position: relative; background: var(--bg);
  padding: 32px 28px 30px;
  transition: background-color .3s;
}
.card:hover { background: var(--bg-2); }
.card__n { position: absolute; top: 20px; right: 22px; font: 400 .72rem var(--mono); color: var(--dim); }
.card__icon {
  width: 40px; height: 40px; fill: none; stroke: var(--accent); stroke-width: 1.4;
  stroke-linejoin: round; stroke-linecap: round;
}
.card h3 { margin-top: 26px; font-size: 1.2rem; }
.card > p { margin-top: 10px; color: var(--muted); font-size: .95rem; }
.card .ticks { margin-top: 20px; padding-top: 18px; border-top: 1px dashed var(--line-2); }

/* Ablauf */
.steps { display: grid; gap: 0; counter-reset: s; position: relative; }
@media (min-width: 900px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.step {
  position: relative; padding: 28px 24px 28px 28px;
  border-left: 1px solid var(--line-2);
}
.step::before {
  content: ""; position: absolute; left: -5px; top: 32px;
  width: 9px; height: 9px; background: var(--bg); border: 1px solid var(--accent);
  transform: rotate(45deg);
}
@media (min-width: 900px) {
  .step { border-left: 0; border-top: 1px solid var(--line-2); padding: 36px 28px 0 0; }
  .step::before { left: 0; top: -5px; }
}
.step__k { font: 400 .75rem var(--mono); color: var(--accent); }
.step h3 { margin-top: 12px; font-size: 1.2rem; }
.step > p:not([class]) { margin-top: 10px; color: var(--muted); font-size: .95rem; }
.step__out {
  margin-top: 18px; display: inline-flex; gap: 10px; align-items: baseline; flex-wrap: wrap;
  font: 400 .8rem var(--mono); color: var(--text);
}
.step__out span { color: var(--dim); }
.step__out span::after { content: " →"; }

/* Überwachung / Terminal */
.monitor { display: grid; gap: 48px; align-items: center; }
@media (min-width: 980px) { .monitor { grid-template-columns: .9fr 1.1fr; gap: 72px; } }
.monitor__text > p:not([class]) { margin-top: 18px; color: var(--muted); font-size: 1.05rem; }
.note { margin-top: 18px; font: 400 .75rem var(--mono); color: var(--dim); }

.term {
  border: 1px solid var(--line-2); border-radius: 6px; background: #06080a; overflow: hidden;
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, .9);
}
.term__bar {
  display: flex; align-items: center; gap: 7px;
  padding: 10px 14px; border-bottom: 1px solid var(--line);
  font: 400 .72rem var(--mono); color: var(--dim);
}
.term__bar i { width: 9px; height: 9px; border-radius: 50%; border: 1px solid var(--line-2); }
.term__bar span { margin-left: auto; }
.term__log { padding: 18px 16px 22px; font: 400 .8rem/1.9 var(--mono); color: var(--text); overflow-x: auto; }
.term__log li { display: grid; grid-template-columns: auto auto 1fr; gap: 0 12px; white-space: nowrap; }
@media (max-width: 520px) {
  .term__log { font-size: .74rem; line-height: 1.6; }
  .term__log li { grid-template-columns: auto 1fr; white-space: normal; padding: 4px 0; }
  .term__log .msg { grid-column: 2; }
}
.term__log time { color: var(--dim); }
.ok { color: var(--accent); }
.warn { color: var(--warn); }
.info { color: #93c5fd; }
.term__cursor span { animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Modelle */
.plans { display: grid; gap: 16px; }
@media (min-width: 900px) { .plans { grid-template-columns: repeat(3, 1fr); gap: 0; } }
.plan {
  display: flex; flex-direction: column;
  padding: 32px 28px; border: 1px solid var(--line-2); background: var(--bg);
  border-radius: 6px;
}
@media (min-width: 900px) {
  .plan { border-radius: 0; }
  .plan + .plan { border-left: 0; }
  .plan:first-child { border-radius: 6px 0 0 6px; }
  .plan:last-child { border-radius: 0 6px 6px 0; }
}
.plan--main { background: var(--bg-3); box-shadow: inset 0 2px 0 var(--accent); }
.plan__k { display: flex; justify-content: space-between; align-items: center; gap: 8px; font: 400 .75rem var(--mono); color: var(--dim); }
.plan__badge { color: var(--accent); border: 1px solid rgba(94, 234, 212, .4); padding: 2px 8px; border-radius: 99px; }
.plan h3 { margin-top: 18px; font-size: 1.5rem; }
.plan__for { margin-top: 8px; color: var(--muted); font-size: .95rem; }
.plan .ticks { margin: 24px 0 28px; }
.plan__price {
  margin-top: auto; padding-top: 18px; border-top: 1px solid var(--line);
  font: 500 .8rem var(--mono); color: var(--text);
}

.quote {
  margin: clamp(48px, 6vw, 80px) 0 0; max-width: 860px;
  padding-left: 28px; border-left: 2px solid var(--accent);
}
.quote p { font-size: clamp(1.2rem, 1rem + 1vw, 1.65rem); line-height: 1.4; letter-spacing: -0.015em; }
.quote footer { margin-top: 16px; font: 400 .78rem var(--mono); color: var(--dim); display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.quote__tag { color: var(--warn); border: 1px solid rgba(251, 191, 36, .45); padding: 1px 8px; border-radius: 2px; }

/* FAQ */
.faq { display: grid; gap: 0 72px; }
@media (min-width: 980px) { .faq { grid-template-columns: .8fr 1.2fr; } }
.faq__list { border-top: 1px solid var(--line-2); }
.faq details { border-bottom: 1px solid var(--line-2); }
.faq summary {
  position: relative; list-style: none; cursor: pointer;
  padding: 22px 48px 22px 0; font-size: 1.05rem; font-weight: 500;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font: 400 1.2rem var(--mono); color: var(--accent); transition: transform .2s;
}
.faq details[open] summary::after { content: "−"; }
.faq summary:hover { color: var(--accent); }
.faq details p { padding: 0 48px 24px 0; color: var(--muted); }

/* Kontakt */
.contact { display: grid; gap: 48px; }
@media (min-width: 980px) { .contact { grid-template-columns: 1fr 1fr; gap: 80px; } }
.contact__info > p:not([class]) { margin-top: 18px; color: var(--muted); font-size: 1.05rem; max-width: 34em; }
.addr { margin: 32px 0 0; border-top: 1px solid var(--line); }
.addr > div { display: grid; grid-template-columns: 7.5em 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.addr dt { font: 400 .75rem/1.9 var(--mono); color: var(--dim); }
.addr dd { margin: 0; }
.addr a { text-decoration-color: var(--line-2); text-underline-offset: 4px; }
.addr a:hover { color: var(--accent); }

.form {
  padding: clamp(24px, 4vw, 40px); border: 1px solid var(--line-2); border-radius: 6px;
  background: var(--bg-2);
}
.form__row + .form__row { margin-top: 18px; }
.form__row--half { display: grid; gap: 18px; }
@media (min-width: 560px) { .form__row--half { grid-template-columns: 1fr 1fr; } }
.form label { display: block; margin-bottom: 7px; font: 400 .75rem var(--mono); color: var(--muted); }
.form input:not([type="checkbox"]), .form select, .form textarea {
  width: 100%; min-height: 46px; padding: 11px 13px;
  font: 400 1rem/1.4 var(--sans); color: var(--text);
  background: var(--bg); border: 1px solid var(--line-2); border-radius: var(--radius);
  transition: border-color .2s;
}
.form textarea { resize: vertical; min-height: 110px; }
.form select {
  appearance: none; -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
  background-size: 5px 5px; background-repeat: no-repeat;
}
.form ::placeholder { color: var(--dim); }
.form input:hover, .form select:hover, .form textarea:hover { border-color: var(--dim); }
.form input:focus-visible, .form select:focus-visible, .form textarea:focus-visible { outline-offset: 0; border-color: var(--accent); }
.form [aria-invalid="true"] { border-color: var(--warn) !important; }
.form__check { display: flex; gap: 12px; align-items: flex-start; }
.form__check input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--accent); flex: none; }
.form__check label { margin: 0; font: 400 .85rem/1.5 var(--sans); color: var(--muted); }
.form .btn { margin-top: 26px; width: 100%; }
.form__msg { margin-top: 16px; font: 400 .85rem/1.5 var(--mono); min-height: 1.5em; }
.form__msg.is-ok { color: var(--accent); }
.form__msg.is-err { color: var(--warn); }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 32px 0 40px; background: var(--bg); }
.footer__inner { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; }
.footer__brand { font: 500 .95rem var(--mono); }
.footer__brand .dim { font-weight: 400; font-size: .8rem; }
.footer__links { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.footer__links a { font-size: .9rem; color: var(--muted); text-underline-offset: 4px; }
.footer__links a:hover { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* 4K-Bildschirme: ab 1920 px wächst die Grundschrift mit (bei 3840 px ≈ 1,6×).
   Weil Schriften, Abstände und --wrap in rem stehen, skaliert das ganze Layout gleichmäßig. */
@media (min-width: 1921px) { html { font-size: calc(100% + (100vw - 1920px) / 192); } }