/* ============================================
   InterTechno Engineering GmbH — v3
   Inter-only. No decorative serif. Engineered look.
   ============================================ */

:root {
  --primary: #1B3A4B;
  --primary-dark: #12293A;
  --secondary: #2E6E8E;
  --accent: #A8C5D6;

  --ink: #111517;
  --ink-2: #3E4A52;
  --ink-3: #7A848C;

  --paper: #FAFAF7;       /* warm off-white, nicht rein weiß */
  --paper-2: #F1EFEA;
  --card: #FFFFFF;
  --rule: #D8D4CB;
  --rule-2: #E8E4DC;
  --rule-dark: rgba(168, 197, 214, 0.22);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --container: 1240px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 70px; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

@media (max-width: 760px) { .container { padding: 0 20px; } }

section { padding: 120px 0; border-top: 1px solid var(--rule); }
section:first-of-type { border-top: none; }

@media (max-width: 768px) { section { padding: 72px 0; } }

/* ---------- Typo: Inter only ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 500;
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: -0.022em;
}

h1 {
  font-size: clamp(2rem, 4.3vw, 3.2rem);
  font-weight: 500;
  letter-spacing: -0.028em;
  line-height: 1.04;
}

h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.022em;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: -0.012em;
  margin-bottom: 0.4rem;
}

p {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink-2);
  max-width: 62ch;
}

p + p { margin-top: 1rem; }

.lead {
  font-size: 1.15rem;
  font-weight: 400;
  line-height: 1.55;
  color: var(--ink);
  letter-spacing: -0.012em;
  max-width: 56ch;
}

/* Mono label used EVERYWHERE for technical markers */
.mono {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Chapter marker: pure mono, minimal */
.chapter {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 2.5rem;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.chapter .num {
  color: var(--ink);
  font-weight: 500;
}

.chapter .dash {
  width: 24px;
  height: 1px;
  background: var(--ink-3);
}

.chapter.on-dark {
  border-bottom-color: var(--rule-dark);
  color: var(--accent);
}

.chapter.on-dark .num { color: var(--paper); }
.chapter.on-dark .dash { background: var(--accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  min-height: 48px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn .arr {
  font-family: var(--font-mono);
  font-weight: 400;
  transform: translateY(-0.5px);
}

.btn-light {
  background: var(--paper);
  color: var(--primary);
  border-color: var(--paper);
}

.btn-light:hover {
  background: transparent;
  color: var(--paper);
  border-color: var(--paper);
}

.btn-dark {
  background: var(--primary);
  color: var(--paper);
  border-color: var(--primary);
}

.btn-dark:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  background: var(--primary);
  color: var(--paper);
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: box-shadow 0.2s ease;
}

.site-header.scrolled { box-shadow: 0 1px 0 rgba(18,41,58,0.15); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 40px;
  max-width: var(--container);
  margin: 0 auto;
}

@media (max-width: 760px) { .nav { padding: 14px 20px; } }

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--paper);
  line-height: 1;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0;
  border-radius: 1px;
  transform: translateY(3px);
}

.brand-name {
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: -0.012em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: rgba(255,255,255,0.55);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.75rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 400;
  color: rgba(255,255,255,0.82);
  padding: 6px 0;
  transition: color 0.15s ease;
}

.nav-links a:hover { color: var(--paper); }

/* Hamburger */
.nav-toggle {
  display: none;
  background: transparent; border: none; cursor: pointer;
  padding: 8px; color: var(--paper);
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
}

.nav-toggle span {
  display: block; width: 22px; height: 1px;
  background: var(--paper); position: relative;
  transition: all 0.25s ease;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: ""; position: absolute; left: 0;
  width: 22px; height: 1px; background: var(--paper);
  transition: all 0.25s ease;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top: 6px; }

.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { transform: rotate(45deg); top: 0; }
.nav-toggle.open span::after  { transform: rotate(-45deg); top: 0; }

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; top: 0; right: 0;
    width: min(340px, 85vw); height: 100vh;
    background: var(--primary);
    flex-direction: column; align-items: flex-start;
    gap: 0; padding: 90px 28px 28px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links li { width: 100%; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .nav-links a { display: block; padding: 18px 0; font-size: 1rem; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--primary);
  color: var(--paper);
  padding: 0;
  border-top: none;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  min-height: 78vh;
}

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; min-height: auto; }
}

.hero-copy {
  padding: 120px 56px 80px;
  max-width: 720px;
  align-self: center;
}

@media (max-width: 960px) { .hero-copy { padding: 72px 24px 56px; } }

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent);
  margin-bottom: 2.25rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-kicker .bar {
  width: 32px; height: 1px;
  background: var(--accent);
  display: inline-block;
}

.hero h1 {
  color: var(--paper);
  font-size: clamp(1.9rem, 4.4vw, 3.2rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  max-width: 14ch;
}

.hero-sub {
  font-size: 1.02rem;
  line-height: 1.55;
  color: rgba(255,255,255,0.78);
  margin-bottom: 2.25rem;
  max-width: 50ch;
}

.hero-cta-row {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.hero-cta-row .secondary {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.62);
}

.hero-cta-row .secondary a {
  color: var(--paper);
  border-bottom: 1px solid rgba(255,255,255,0.3);
  padding-bottom: 1px;
}
.hero-cta-row .secondary a:hover { border-color: var(--paper); }

/* Hero right: engineered blueprint-style diagram */
.hero-diagram {
  position: relative;
  background: #0F2230;
  border-left: 1px solid rgba(168,197,214,0.12);
  overflow: hidden;
  min-height: 420px;
}

@media (max-width: 960px) { .hero-diagram { min-height: 360px; } }

.hero-diagram .grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(168,197,214,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(168,197,214,0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

.hero-diagram .diagram-label {
  position: absolute;
  left: 32px;
  top: 32px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--accent);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  z-index: 3;
}

.hero-diagram .diagram-label .sub {
  color: rgba(168,197,214,0.55);
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.7rem;
  margin-top: 4px;
  display: block;
}

.hero-diagram .diagram-coords {
  position: absolute;
  right: 32px;
  top: 32px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.7;
  color: rgba(168,197,214,0.6);
  text-align: right;
  z-index: 3;
}

.hero-diagram .diagram-coords strong {
  color: var(--accent);
  font-weight: 500;
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
  font-size: 0.68rem;
}

.hero-diagram svg.diagram {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
}

.hero-diagram .callout {
  position: absolute;
  z-index: 3;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: rgba(168,197,214,0.78);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 4px 8px;
  background: rgba(15,34,48,0.9);
  border: 1px solid rgba(168,197,214,0.2);
}

/* Hero bottom meta-strip */
.hero-meta-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--primary-dark);
  color: rgba(255,255,255,0.72);
  border-top: 1px solid rgba(168,197,214,0.18);
}

.hero-meta-strip > div {
  padding: 22px 28px;
  border-right: 1px solid rgba(168,197,214,0.12);
  font-size: 0.88rem;
  line-height: 1.5;
}

.hero-meta-strip > div:last-child { border-right: none; }

.hero-meta-strip .mlabel {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 4px;
  display: block;
}

@media (max-width: 880px) {
  .hero-meta-strip { grid-template-columns: 1fr 1fr; }
  .hero-meta-strip > div { border-right: 1px solid rgba(168,197,214,0.12); border-bottom: 1px solid rgba(168,197,214,0.12); }
  .hero-meta-strip > div:nth-child(2n) { border-right: none; }
}

@media (max-width: 560px) {
  .hero-meta-strip { grid-template-columns: 1fr; }
  .hero-meta-strip > div { border-right: none; }
  .hero-meta-strip > div:last-child { border-bottom: none; }
}

/* ---------- Intro / Über uns ---------- */
.intro .two-col {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 80px;
  align-items: start;
}

.intro .col-head h2 { max-width: 14ch; }

.intro .quote {
  margin-top: 2rem;
  padding-left: 18px;
  border-left: 2px solid var(--primary);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.5;
  max-width: 46ch;
}

@media (max-width: 880px) {
  .intro .two-col { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- Leistungen: nummerierte Tabelle ---------- */
.services { background: var(--paper-2); }

.services .top {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  margin-bottom: 3rem;
}

@media (max-width: 880px) {
  .services .top { grid-template-columns: 1fr; gap: 24px; }
}

.services-table {
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.services-row {
  display: grid;
  grid-template-columns: 70px 1.2fr 2fr;
  gap: 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  transition: background 0.15s ease, padding 0.15s ease;
  color: inherit;
  text-decoration: none;
  position: relative;
}

.services-row::after {
  content: "→";
  position: absolute;
  right: 8px;
  top: 32px;
  font-family: var(--font-mono);
  color: var(--ink-3);
  opacity: 0;
  transition: opacity .15s ease, transform .2s ease;
}
.services-row:hover::after { opacity: 1; transform: translateX(4px); color: var(--primary); }

.services-row:last-child { border-bottom: none; }

.services-row:hover { background: rgba(27, 58, 75, 0.035); }

.services-row .s-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

.services-row .s-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -0.018em;
}

.services-row .s-desc {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 56ch;
  margin: 0;
}

@media (max-width: 700px) {
  .services-row {
    grid-template-columns: 40px 1fr;
    gap: 12px 16px;
    padding: 20px 0;
  }
  .services-row .s-desc {
    grid-column: 2 / 3;
    margin-top: 6px;
  }
  .services-row .s-title { font-size: 1.05rem; }
}

/* ---------- Wasser nützen ---------- */
.water-use {
  background: var(--primary);
  color: var(--paper);
  border-top-color: transparent;
}

.water-use h2,
.water-use .chapter .num,
.water-use .chapter .label { color: var(--paper); }

.water-use p { color: rgba(255,255,255,0.82); }

.split {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 72px;
  align-items: start;
}

.split-reverse .split-panel { order: 2; }

@media (max-width: 880px) {
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split-reverse .split-panel { order: 0; }
}

/* ---------- Referenz/Kennzahlen-Panel ---------- */
.ref-panel {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 0;
  position: relative;
}

.ref-panel.dark {
  background: #0F2230;
  border-color: rgba(168,197,214,0.18);
  color: var(--paper);
}

.ref-panel .rp-head {
  padding: 18px 24px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--ink-3);
  letter-spacing: 0.03em;
}

.ref-panel.dark .rp-head {
  border-bottom-color: rgba(168,197,214,0.18);
  color: var(--accent);
}

.ref-panel .rp-head .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--secondary);
  display: inline-block;
  margin-right: 8px;
  vertical-align: middle;
}

.ref-panel.dark .rp-head .dot { background: var(--accent); }

.ref-panel .rp-body { padding: 8px 0; }

.ref-item {
  display: grid;
  grid-template-columns: 80px 1fr 80px;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--rule-2);
  align-items: baseline;
}

.ref-panel.dark .ref-item { border-bottom-color: rgba(168,197,214,0.1); }

.ref-item:last-child { border-bottom: none; }

.ref-item .r-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.ref-panel.dark .ref-item .r-num { color: rgba(168,197,214,0.7); }

.ref-item .r-title {
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.012em;
  line-height: 1.35;
}

.ref-panel.dark .ref-item .r-title { color: var(--paper); }

.ref-item .r-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  margin-top: 3px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.ref-panel.dark .ref-item .r-sub { color: rgba(168,197,214,0.55); }

.ref-item .r-year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink);
  text-align: right;
}

.ref-panel.dark .ref-item .r-year { color: var(--accent); }

.ref-panel .rp-foot {
  padding: 14px 24px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  display: flex;
  justify-content: space-between;
}

.ref-panel.dark .rp-foot {
  border-top-color: rgba(168,197,214,0.18);
  color: rgba(168,197,214,0.55);
}

/* Feature list — plain, editorial */
.feature-list {
  list-style: none;
  margin-top: 2rem;
}

.feature-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.98rem;
  line-height: 1.5;
  align-items: baseline;
}

.feature-list li:first-child { border-top: 1px solid var(--rule); }

.feature-list li .n {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-3);
}

.feature-list.on-dark li {
  border-bottom-color: var(--rule-dark);
  color: rgba(255,255,255,0.92);
}

.feature-list.on-dark li:first-child { border-top-color: var(--rule-dark); }
.feature-list.on-dark li .n { color: var(--accent); }

/* ---------- Warum iteag ---------- */
.why { background: var(--paper); }

.why-top {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 80px;
  margin-bottom: 3rem;
  align-items: start;
}

@media (max-width: 880px) {
  .why-top { grid-template-columns: 1fr; gap: 24px; }
}

.why-list { border-top: 1px solid var(--ink); }

.why-item {
  display: grid;
  grid-template-columns: 80px 1fr 1.3fr;
  gap: 40px;
  padding: 36px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}

.why-item .w-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.why-item h3 {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0;
  max-width: 18ch;
}

.why-item p {
  font-size: 1rem;
  color: var(--ink-2);
  margin: 0;
  max-width: 50ch;
}

@media (max-width: 880px) {
  .why-item {
    grid-template-columns: 40px 1fr;
    gap: 14px;
    padding: 28px 0;
  }
  .why-item p { grid-column: 2 / 3; margin-top: 8px; }
}

/* ---------- Kontakt ---------- */
.contact {
  background: var(--primary);
  color: var(--paper);
  border-top-color: transparent;
}

.contact h2 { color: var(--paper); }
.contact p { color: rgba(255,255,255,0.82); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 72px;
  align-items: start;
}

@media (max-width: 880px) {
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
}

.contact-info-block {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.contact-info-block .block-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--rule-dark);
  align-items: baseline;
}

.contact-info-block .block-row:last-child { border-bottom: 1px solid var(--rule-dark); }

.contact-info-block .bl-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.contact-info-block .bl-val {
  font-size: 1rem;
  font-weight: 400;
  color: var(--paper);
  line-height: 1.5;
  letter-spacing: -0.005em;
}

.contact-info-block a {
  color: var(--paper);
  border-bottom: 1px solid rgba(168,197,214,0.45);
  padding-bottom: 2px;
}

.contact-info-block a:hover { border-bottom-color: var(--accent); }

/* Form */
.contact-form { display: grid; gap: 20px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 6px; }

.field label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field label .req { color: var(--accent); }

.field input,
.field textarea {
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(168,197,214,0.4);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 10px 0;
  min-height: 44px;
  border-radius: 0;
  transition: border-color 0.18s ease;
  resize: vertical;
  letter-spacing: -0.005em;
}

.field textarea { min-height: 120px; line-height: 1.55; }

.field input::placeholder,
.field textarea::placeholder { color: rgba(255,255,255,0.32); }

.field input:focus,
.field textarea:focus {
  outline: none;
  border-bottom-color: var(--accent);
}

.form-submit { margin-top: 12px; justify-self: start; }

.form-success {
  display: none;
  padding: 22px 24px;
  background: rgba(168,197,214,0.08);
  border: 1px solid rgba(168,197,214,0.35);
  color: var(--paper);
  font-size: 0.98rem;
  line-height: 1.55;
}

.form-success.visible { display: block; }

.form-note {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
  max-width: 48ch;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.65);
  padding: 56px 0 32px;
  font-size: 0.88rem;
  border-top: none;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(168,197,214,0.15);
}

@media (max-width: 880px) { .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 560px) { .footer-top { grid-template-columns: 1fr; } }

.footer-brand .brand-name { color: var(--paper); font-size: 1rem; display: block; font-weight: 500; }
.footer-brand .brand-sub { color: rgba(255,255,255,0.5); font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; }
.footer-brand address {
  font-style: normal;
  margin-top: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.footer-col ul { list-style: none; }
.footer-col li { padding: 5px 0; }
.footer-col a { color: rgba(255,255,255,0.72); transition: color 0.15s ease; }
.footer-col a:hover { color: var(--paper); }

.footer-copy {
  margin-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

::selection { background: var(--accent); color: var(--primary); }

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


/* ---------- Subpage hero ---------- */
.subhero {
  background: var(--primary);
  color: var(--paper);
  padding: 90px 0 70px;
  border-top: none;
  position: relative;
  overflow: hidden;
}

.subhero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(168,197,214,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(168,197,214,0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  opacity: 0.7;
}

.subhero .container { position: relative; z-index: 1; }

.subhero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(168,197,214,0.75);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 2.25rem;
}
.subhero .breadcrumb a { color: rgba(168,197,214,0.75); border-bottom: 1px solid transparent; transition: border-color .15s ease; }
.subhero .breadcrumb a:hover { border-bottom-color: var(--accent); }
.subhero .breadcrumb .sep { opacity: 0.5; }
.subhero .breadcrumb .here { color: var(--paper); }

.subhero .kicker {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1.5rem;
}
.subhero .kicker .bar { width: 24px; height: 1px; background: var(--accent); }

.subhero h1 {
  color: var(--paper);
  max-width: 20ch;
  margin-bottom: 1.25rem;
  letter-spacing: -0.028em;
  font-size: clamp(2rem, 4vw, 2.9rem);
}
.subhero .lead { color: rgba(255,255,255,0.82); max-width: 60ch; font-size: 1.05rem; }

/* Leistung-Layout: zwei Spalten */
.leistung-body {
  display: grid;
  grid-template-columns: 1fr 1.55fr;
  gap: 80px;
  align-items: start;
}
@media (max-width: 900px) { .leistung-body { grid-template-columns: 1fr; gap: 32px; } }

.leistung-body .side {
  position: sticky;
  top: 90px;
  border-top: 1px solid var(--ink);
  padding-top: 18px;
}

.leistung-body .side .mono {
  display: block;
  margin-bottom: 10px;
  color: var(--ink-3);
}

.leistung-body .side h3 {
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  max-width: 14ch;
}

.leistung-body .side .side-list {
  list-style: none;
  border-top: 1px solid var(--rule);
  margin-top: 1rem;
}
.leistung-body .side .side-list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
  color: var(--ink-2);
}
.leistung-body .side .side-list li .n {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-3);
}

.leistung-body .main h2 {
  font-size: 1.55rem;
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}
.leistung-body .main h2:first-child { margin-top: 0; }

.leistung-body .main p { max-width: 64ch; }

.leistung-body .main .callout {
  margin: 2rem 0;
  padding: 22px 24px;
  background: var(--paper-2);
  border-left: 2px solid var(--primary);
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.55;
}

/* Sibling navigation */
.siblings {
  background: var(--paper-2);
}
.siblings .grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 780px) { .siblings .grid { grid-template-columns: 1fr; } }

.siblings .card {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 22px 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 150px;
  transition: border-color .2s ease, transform .2s ease;
}
.siblings .card:hover { border-color: var(--primary); transform: translateY(-2px); }
.siblings .card .n {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.siblings .card .t {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.015em;
  line-height: 1.25;
}
.siblings .card .arr {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--primary);
}

/* CTA strip */
.cta-strip {
  background: var(--primary-dark);
  color: var(--paper);
  padding: 60px 0;
  border-top: 1px solid rgba(168,197,214,0.12);
}
.cta-strip .row {
  display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap;
}
.cta-strip h3 {
  color: var(--paper);
  font-size: 1.6rem;
  max-width: 22ch;
  letter-spacing: -0.022em;
  line-height: 1.2;
}
.cta-strip p { color: rgba(255,255,255,0.7); max-width: 42ch; margin-top: 4px; }


/* ============================================
   ANIMATIONS
   ============================================ */

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

/* Staggered rows */
.stagger > * {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.stagger.in > * { opacity: 1; transform: none; }
.stagger.in > *:nth-child(1) { transition-delay: 0.03s; }
.stagger.in > *:nth-child(2) { transition-delay: 0.08s; }
.stagger.in > *:nth-child(3) { transition-delay: 0.13s; }
.stagger.in > *:nth-child(4) { transition-delay: 0.18s; }
.stagger.in > *:nth-child(5) { transition-delay: 0.23s; }
.stagger.in > *:nth-child(6) { transition-delay: 0.28s; }
.stagger.in > *:nth-child(7) { transition-delay: 0.33s; }
.stagger.in > *:nth-child(8) { transition-delay: 0.38s; }
.stagger.in > *:nth-child(9) { transition-delay: 0.43s; }
.stagger.in > *:nth-child(10) { transition-delay: 0.48s; }
.stagger.in > *:nth-child(11) { transition-delay: 0.53s; }
.stagger.in > *:nth-child(12) { transition-delay: 0.58s; }

/* Hero: small fade-up on copy */
.hero-copy .hero-kicker,
.hero-copy h1,
.hero-copy .hero-sub,
.hero-copy .hero-cta-row {
  opacity: 0;
  transform: translateY(14px);
  animation: heroRise 0.8s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}
.hero-copy .hero-kicker   { animation-delay: 0.05s; }
.hero-copy h1             { animation-delay: 0.15s; }
.hero-copy .hero-sub      { animation-delay: 0.28s; }
.hero-copy .hero-cta-row  { animation-delay: 0.42s; }

@keyframes heroRise {
  to { opacity: 1; transform: none; }
}

/* Hero diagram: line draw-in */
svg.diagram .anim-draw {
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
  animation: drawLine 2.2s ease-out 0.4s forwards;
}
svg.diagram .anim-draw-2 {
  stroke-dasharray: 800;
  stroke-dashoffset: 800;
  animation: drawLine 1.8s ease-out 0.9s forwards;
}
svg.diagram .anim-fade {
  opacity: 0;
  animation: fadeIn 0.6s ease-out forwards;
}
svg.diagram .anim-fade-1 { animation-delay: 1.6s; }
svg.diagram .anim-fade-2 { animation-delay: 1.9s; }
svg.diagram .anim-fade-3 { animation-delay: 2.2s; }

@keyframes drawLine {
  to { stroke-dashoffset: 0; }
}
@keyframes fadeIn {
  to { opacity: 1; }
}

/* Water flow in penstock - continuous */
svg.diagram .flow {
  stroke-dasharray: 4 8;
  animation: flow 1.8s linear infinite;
}
@keyframes flow {
  to { stroke-dashoffset: -24; }
}

/* Turbine spin */
svg.diagram .turbine-blade {
  transform-origin: 510px 398px;
  transform-box: fill-box;
  animation: spin 3s linear infinite;
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Hero kicker bar grow */
.hero-kicker .bar {
  transform-origin: left center;
  animation: barGrow 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) 0.1s both;
}
@keyframes barGrow {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* Brand mark subtle pulse on load */
.brand-mark {
  animation: markIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
@keyframes markIn {
  0%   { transform: translateY(3px) scale(0.6); opacity: 0; }
  100% { transform: translateY(3px) scale(1);   opacity: 1; }
}

/* Chapter marker: dash grow in view */
.chapter .dash {
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) 0.2s;
}
.chapter.in-view .dash { transform: scaleX(1); }

/* Subhero kicker bar */
.subhero .kicker .bar {
  transform-origin: left center;
  animation: barGrow 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) 0.15s both;
}

/* Meta strip cells fade up sequentially */
.hero-meta-strip.in > div {
  animation: metaIn 0.6s ease-out both;
}
.hero-meta-strip.in > div:nth-child(1) { animation-delay: 0.7s; }
.hero-meta-strip.in > div:nth-child(2) { animation-delay: 0.8s; }
.hero-meta-strip.in > div:nth-child(3) { animation-delay: 0.9s; }
.hero-meta-strip.in > div:nth-child(4) { animation-delay: 1.0s; }
.hero-meta-strip > div { opacity: 0; }
@keyframes metaIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}

/* Link underline sweep on nav hover */
.nav-links a {
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

/* Respect user pref */
@media (prefers-reduced-motion: reduce) {
  .reveal, .stagger > *,
  .hero-copy .hero-kicker,
  .hero-copy h1,
  .hero-copy .hero-sub,
  .hero-copy .hero-cta-row,
  svg.diagram .anim-draw,
  svg.diagram .anim-draw-2,
  svg.diagram .anim-fade,
  svg.diagram .flow,
  svg.diagram .turbine-blade,
  .hero-kicker .bar,
  .brand-mark,
  .chapter .dash,
  .hero-meta-strip.in > div {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
    stroke-dashoffset: 0 !important;
  }
}