/* D.ONE engineering – Stylesheet
   Schriften lokal (keine externen Requests). Dunkles Design als bewusste Entscheidung. */

@font-face {
  font-family: "Archivo";
  src: url("fonts/archivo-var.woff2") format("woff2");
  font-weight: 400 800;
  font-stretch: 62.5% 125%;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}

:root {
  --bg: #0b0d10;
  --bg-raised: #12151a;
  --line: #232830;
  --line-strong: #363d48;
  --grid: rgba(255, 255, 255, 0.045);
  --text: #e7eaee;
  --text-2: #b6bcc6;
  --muted: #8f97a3;
  --accent: #f2b705;
  --accent-ink: #0b0d10;
  --accent-soft: rgba(242, 183, 5, 0.12);

  --font-sans: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --fs-hero: clamp(2.7rem, 7vw, 5.4rem);
  --fs-h2: clamp(1.9rem, 3.6vw, 2.9rem);
  --fs-h3: 1.45rem;
  --fs-body: 1.0625rem;
  --fs-small: 0.92rem;
  --fs-mono: 0.78rem;

  --gutter: clamp(16px, 5vw, 48px);
  --container: 1180px;
  --radius: 2px;

  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  font-stretch: 100%;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.1; text-wrap: balance; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.02em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- Wortmarke ---------- */
/* D.ONE gibt die Breite vor; Maßlinie und ENGINEERING spannen sich darüber. */

.wordmark {
  display: inline-grid;
  grid-template-columns: max-content;
  row-gap: 0.2rem;
  font-family: var(--font-sans);
  font-weight: 800;
  font-stretch: 125%;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--text);
  white-space: nowrap;
}
.wordmark .wm-name { display: block; }
.wordmark .dot {
  display: inline-block;
  width: 0.2em;
  height: 0.2em;
  margin: 0 0.05em;
  background: var(--accent);
  vertical-align: baseline;
}
.wordmark .wm-dim {
  position: relative;
  height: 9px;
  border-inline: 1px solid var(--line-strong);
  background: linear-gradient(var(--muted), var(--muted)) center / 100% 1px no-repeat;
}
.wordmark .wm-dim::before,
.wordmark .wm-dim::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 0;
  height: 0;
  border-block: 2px solid transparent;
  transform: translateY(-50%);
}
.wordmark .wm-dim::before { left: 0; border-right: 7px solid var(--muted); }
.wordmark .wm-dim::after { right: 0; border-left: 7px solid var(--muted); }
.wordmark .wm-sub {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-weight: 400;
  font-stretch: 100%;
  font-size: 0.6rem;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--muted);
}
.wordmark .wm-sub i { font-style: normal; }

/* ---------- Navigation ---------- */

.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: rgba(11, 13, 16, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 64px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--text-2);
  padding-block: 0.25rem;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.nav-links a:hover { color: var(--text); border-color: var(--accent); }
.nav-links .nav-cta { color: var(--accent); }
.nav-links .nav-cta:hover { color: var(--accent); }

.nav-toggle {
  display: none;
  appearance: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
}

@media (max-width: 800px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    display: none;
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--gutter) 1rem;
  }
  .nav-links a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
    font-size: 1rem;
  }
  .nav-links .nav-cta {
    margin-top: 0.75rem;
    justify-content: center;
    border-bottom: 1px solid var(--accent);
  }
  .site-header.is-open .nav-links { display: flex; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.3rem;
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 0.15s, background-color 0.15s, color 0.15s, transform 0.15s;
  cursor: pointer;
}
.btn:hover { border-color: var(--text-2); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover { background: #ffc61a; border-color: #ffc61a; }
.btn .arrow { font-family: var(--font-mono); font-weight: 500; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3.5rem, 9vw, 7.5rem) clamp(3rem, 7vw, 5.5rem);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 75% 90% at 72% 45%, #000 20%, transparent 72%);
  mask-image: radial-gradient(ellipse 75% 90% at 72% 45%, #000 20%, transparent 72%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero-copy { display: flex; flex-direction: column; gap: 1.6rem; }
.hero h1 {
  font-size: var(--fs-hero);
  font-weight: 700;
  font-stretch: 112%;
  letter-spacing: -0.03em;
  line-height: 0.98;
}
.hero h1 .dot {
  display: inline-block;
  width: 0.16em;
  height: 0.16em;
  margin-left: 0.06em;
  background: var(--accent);
}
.hero .lead {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  color: var(--text-2);
  max-width: 34em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  color: var(--muted);
}

/* Technische Zeichnung */
.drawing-wrap { position: relative; }
.drawing {
  width: 100%;
  height: auto;
  overflow: visible;
}
.drawing .outline {
  fill: none;
  stroke: var(--text);
  stroke-width: 1.6;
  stroke-linejoin: miter;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: draw 1.6s cubic-bezier(0.65, 0, 0.25, 1) 0.15s forwards;
}
.drawing .hole {
  fill: none;
  stroke: var(--text);
  stroke-width: 1.4;
}
.drawing .bend {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.3;
  stroke-dasharray: 9 5 2 5;
}
.drawing .dim {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1;
}
.drawing .ext { stroke: var(--line-strong); }
.drawing .dim-arrow { fill: var(--muted); }
.drawing text {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--muted);
  letter-spacing: 0.04em;
}
.drawing text.bend-label { fill: var(--accent); }
.drawing text.title { fill: var(--text-2); font-weight: 500; }
.drawing .centerline {
  stroke: var(--line-strong);
  stroke-width: 0.8;
  stroke-dasharray: 12 3 2 3;
}
.drawing .fade { animation: fadein 0.6s ease 1.2s both; }

@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .drawing-wrap { max-width: 540px; }
}

/* ---------- Spec-Band ---------- */

.strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-raised);
}
.strip ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0;
  padding-block: 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.strip li { display: flex; align-items: center; }
.strip li + li::before {
  content: "";
  display: inline-block;
  width: 4px; height: 4px;
  margin-inline: 1.1rem;
  background: var(--line-strong);
}

/* ---------- Sektionen ---------- */

.section {
  padding-block: clamp(4rem, 9vw, 7.5rem);
  border-top: 1px solid var(--line);
  scroll-margin-top: 64px;
}
.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 3fr);
  gap: 2rem clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.section-aside {
  position: sticky;
  top: calc(64px + 2rem);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.section-aside .note {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: var(--line-strong);
  letter-spacing: 0.04em;
}
.section-body { display: flex; flex-direction: column; gap: 2.5rem; min-width: 0; }
.section h2 {
  font-size: var(--fs-h2);
  font-weight: 700;
  font-stretch: 110%;
  letter-spacing: -0.025em;
  max-width: 18em;
}
.section .intro {
  color: var(--text-2);
  max-width: 38em;
  font-size: 1.08rem;
}

@media (max-width: 800px) {
  .section-grid { grid-template-columns: 1fr; gap: 1.25rem; }
  .section-aside { position: static; }
}

/* ---------- Leistungen ---------- */

.services { border-top: 1px solid var(--line); }
.service {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.8fr);
  gap: 0.75rem 2.5rem;
  padding-block: 1.9rem;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.15s;
}
.service h3 {
  font-size: var(--fs-h3);
  font-weight: 700;
  font-stretch: 108%;
  letter-spacing: -0.015em;
}
.service .service-text { display: flex; flex-direction: column; gap: 1rem; min-width: 0; }
.service p { color: var(--text-2); max-width: 44em; }
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--muted);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .service { grid-template-columns: 1fr; gap: 0.75rem; }
}

/* ---------- Referenzen ---------- */

.refs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.ref {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.75rem;
  background: var(--bg);
  transition: background-color 0.2s;
  min-width: 0;
}
.ref:hover { background: var(--bg-raised); }
.ref-head { display: flex; flex-direction: column; gap: 0.35rem; }
.ref h3 {
  font-size: 1.5rem;
  font-weight: 700;
  font-stretch: 110%;
  letter-spacing: -0.02em;
}
.ref .domain {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  width: fit-content;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.ref .domain:hover { color: var(--accent); border-color: var(--accent); }
.ref .about { color: var(--text-2); font-size: var(--fs-small); }
.ref-work {
  margin-top: auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.ref-work ul { display: flex; flex-direction: column; gap: 0.35rem; }
.ref-work li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: var(--fs-small);
}
.ref-work li::before {
  content: "";
  flex: none;
  width: 6px; height: 6px;
  background: var(--accent);
  transform: translateY(-1px);
}

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

/* ---------- Über / Arbeitsweise ---------- */

.about-text { display: flex; flex-direction: column; gap: 1.2rem; max-width: 40em; }
.about-text p { color: var(--text-2); }
.about-text .person { color: var(--text); }
.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}
.principle { display: flex; flex-direction: column; gap: 0.6rem; }
.principle h3 {
  font-size: 1.15rem;
  font-weight: 700;
  font-stretch: 108%;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.principle h3::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--accent);
  flex: none;
}
.principle p { color: var(--text-2); font-size: var(--fs-small); }

@media (max-width: 800px) {
  .principles { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* ---------- Kontakt ---------- */

.contact { display: flex; flex-direction: column; gap: 2.5rem; }
.contact .mail {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  width: fit-content;
  max-width: 100%;
  font-size: clamp(1.3rem, 3.6vw, 2.6rem);
  font-weight: 700;
  font-stretch: 108%;
  letter-spacing: -0.02em;
  line-height: 1.15;
  border-bottom: 2px solid var(--line-strong);
  padding-bottom: 0.15em;
  transition: border-color 0.15s, color 0.15s;
  overflow-wrap: anywhere;
}
.contact .mail:hover { border-color: var(--accent); }
.contact .mail .arrow { font-family: var(--font-mono); font-weight: 500; color: var(--accent); }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.contact-block { display: flex; flex-direction: column; gap: 0.5rem; }
.contact-block address {
  font-style: normal;
  color: var(--text-2);
  line-height: 1.6;
}
.contact-block a { border-bottom: 1px solid var(--line-strong); }
.contact-block a:hover { border-color: var(--accent); }

@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: var(--muted);
  letter-spacing: 0.03em;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.footer-links a { border-bottom: 1px solid transparent; transition: color 0.15s, border-color 0.15s; }
.footer-links a:hover { color: var(--text); border-color: var(--accent); }

/* ---------- Dokumentseiten (Impressum, Datenschutz, 404) ---------- */

.doc {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
  max-width: 68ch;
}
.doc header { display: flex; flex-direction: column; gap: 0.75rem; }
.doc h1 {
  font-size: var(--fs-h2);
  font-weight: 700;
  font-stretch: 110%;
  letter-spacing: -0.025em;
}
.doc section { display: flex; flex-direction: column; gap: 0.75rem; }
.doc h2 {
  font-size: 1.2rem;
  font-weight: 700;
  font-stretch: 108%;
  padding-top: 0.5rem;
}
.doc p, .doc li, .doc address { color: var(--text-2); font-style: normal; }
.doc ul { list-style: disc; padding-left: 1.2rem; display: flex; flex-direction: column; gap: 0.3rem; }
.doc a { border-bottom: 1px solid var(--line-strong); }
.doc a:hover { border-color: var(--accent); }
.doc .todo {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius);
}
.doc .stand { color: var(--muted); font-family: var(--font-mono); font-size: var(--fs-mono); }

/* ---------- Bewegung reduzieren ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .drawing .outline { animation: none; stroke-dashoffset: 0; }
  .drawing .fade { animation: none; }
  * { transition-duration: 0.01ms !important; }
}

/* ---------- Statische Navigation (Dokumentseiten ohne Toggle) ---------- */

.nav-links.nav-static {
  display: flex;
  position: static;
  flex-direction: row;
  gap: 1.5rem;
  padding: 0;
  border: 0;
  background: none;
}
@media (max-width: 800px) {
  .nav-links.nav-static { gap: 1rem; }
  .nav-links.nav-static a {
    padding: 0.25rem 0;
    border-bottom: 1px solid transparent;
    font-size: 0.85rem;
  }
  .nav-links.nav-static a:hover { border-color: var(--accent); }
}
@media (max-width: 480px) {
  .site-header.static-nav .wordmark .wm-dim,
  .site-header.static-nav .wordmark .wm-sub { display: none; }
}