/* Rivtech · Keep in Flow */

:root {
  --paper: #f4f3ed;
  --paper-2: #e9e8df;
  --ink: #18241f;
  --muted: #4f5d56;
  --rule: #c7ccc3;
  --cyan: #0084d1;
  --cyan-deep: #0084d1;
  --cyan-text: #0084d1;
  --night: #121b17;

  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --pad: clamp(20px, 4.4vw, 72px);
  --gap: clamp(20px, 2.4vw, 40px);
  --header: 92px;

  --flow-accent: var(--cyan);
  --flow-deep: var(--cyan-deep);
  --flow-ink: var(--ink);
  --flow-paper: var(--paper);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: calc(var(--header) + 16px); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-kerning: normal;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
::selection { background: var(--cyan); color: var(--ink); }
:focus-visible { outline: 2px solid var(--cyan-text); outline-offset: 5px; border-radius: 2px; }
 .footer :focus-visible { outline-color: var(--cyan); }
[hidden] { display: none !important; }

.skip {
  position: absolute; left: var(--pad); top: -80px; z-index: 60;
  background: var(--ink); color: var(--paper); padding: 12px 18px; font-size: 14px;
}
.skip:focus { top: 12px; }

/* Typografische Bausteine */
.label {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
}
.label b { font-weight: 400; color: var(--ink); }

.display {
  font-weight: 500;
  letter-spacing: -.052em;
  line-height: .93;
}
.dot { color: var(--cyan); }
.lead {
  font-size: clamp(1.25rem, 1.75vw, 1.7rem);
  line-height: 1.38;
  letter-spacing: -.012em;
  max-width: 34ch;
}
.lead b { font-weight: 500; }
.lead span { color: var(--muted); }
.text-link {
  display: inline-flex; align-items: center; gap: 14px;
  font-size: 15px; padding: 10px 0 9px;
  border-bottom: 1px solid currentColor;
}
.text-link .arrow { display: inline-block; transition: transform .25s ease; }
.text-link:hover .arrow, .text-link:focus-visible .arrow { transform: translate(4px, -2px); }

.sr { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.button {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 15px 26px; border-radius: 999px; border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper); font: inherit; font-size: 15px; cursor: pointer;
  transition: background .2s, color .2s;
}
.button:hover { background: var(--cyan); border-color: var(--cyan); color: var(--night); }

/* Kopf */
.header {
  position: sticky; top: 0; z-index: 30;
  background: var(--paper); border-bottom: 1px solid transparent; transition: border-color .2s;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  min-height: var(--header);
  padding: 0 var(--pad);
}
.brand {
  font-size: 30px; font-weight: 700; letter-spacing: -.055em; line-height: 1;
  padding: 6px 0;
}
.brand i {
  display: inline-block; width: .2em; height: .2em; margin-left: .06em;
  border-radius: 50%; background: var(--cyan);
}
.nav { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 36px); font-size: 14px; }
.nav a { position: relative; padding: 11px 0; display: inline-flex; gap: 6px; align-items: baseline; }
.nav a small { font-family: var(--mono); font-size: 10px; color: var(--muted); }
.nav a:not(.nav-contact)::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 4px; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .25s ease;
}
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav .nav-contact { border: 1px solid var(--ink); border-radius: 999px; padding: 9px 18px; transition: background .2s, color .2s; }
.nav .nav-contact:hover { background: var(--ink); color: var(--paper); }
.nav .lang { padding: 12px 0; font-family: var(--mono); font-size: 12px; letter-spacing: .06em; color: var(--muted); }
.nav .lang b { font-weight: 400; color: var(--ink); }
.nav .lang::after { display: none; }
.header.is-scrolled { border-bottom-color: var(--rule); }
.nav .nav-contact[aria-current="page"] { background: var(--ink); color: var(--paper); }
.menu-button { display: none; }
.page-first { padding-top: clamp(40px, 6vw, 96px); }
.page-first h1.display { font-size: clamp(2.5rem, 5.6vw, 5.8rem); line-height: .98; }
.section-head h1 { grid-column: 4 / 13; }

/* Startseite: Einstieg */
.hero {
  position: relative;
  min-height: clamp(640px, calc(100svh - var(--header)), 960px);
  padding: clamp(24px, 5vh, 64px) var(--pad) clamp(28px, 4vh, 48px);
  display: grid;
  grid-template-rows: auto auto 1fr;
  overflow: hidden;
  isolation: isolate;
}
.hero .label { position: relative; z-index: 2; }
.hero h1 {
  position: relative; z-index: 2;
  font-size: clamp(3.3rem, 8.6vw, 9.6rem);
  margin-top: clamp(18px, 3vh, 34px);
}
.hero h1 > span:not(.dot) { display: block; }
.hero-intro { text-shadow: 0 0 10px var(--paper), 0 0 3px var(--paper); position: relative; z-index: 2; margin-top: clamp(26px, 4vh, 44px); max-width: 30ch; }
.hero-floor {
  position: relative; z-index: 2;
  display: flex; align-items: flex-end; justify-content: space-between; gap: 24px;
  padding-top: 32px;
}
.hero-floor { justify-content: flex-start; align-items: center; gap: 28px; align-self: end; }
.hero-flow {
  position: absolute; inset: 33% -1% 0 0; z-index: 1;
  --flow-fade: .4;
}

/* Flussgrafik: Canvas mit ruhender SVG-Fassung */
:where(.flow) { position: relative; }
.flow > img, .flow > canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.flow > img { object-fit: cover; }
.flow > canvas { opacity: 0; }
.flow.is-live > canvas { opacity: 1; }
.flow.is-live > img { visibility: hidden; }

/* Abschnitte */
.section { padding: clamp(72px, 11vw, 160px) var(--pad); }
.section-head {
  display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--gap);
  margin-bottom: clamp(40px, 6vw, 88px);
}
.section-head .label { grid-column: 1 / 4; padding-top: .9em; }
.section-head h2 { grid-column: 4 / 13; }
.section-head .lead { grid-column: 7 / 13; margin-top: clamp(20px, 3vw, 40px); max-width: 36ch; }
h2.display { font-size: clamp(2.5rem, 5.6vw, 5.8rem); line-height: .98; }

/* Drei Zustände */
.states-flow { height: clamp(220px, 28vw, 420px); margin: 0 calc(var(--pad) * -1); }
.states-flow > img, .states-flow > canvas { left: var(--pad); width: calc(100% - var(--pad) * 2); }
.states { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.state {
  position: relative; display: flex; flex-direction: column; gap: 14px;
  padding: 26px var(--gap) 8px 0;
  transition: opacity .3s;
}
.state + .state { padding-left: var(--gap); border-left: 1px solid var(--rule); }
.state h2 { font-size: clamp(2rem, 3.2vw, 3.2rem); font-weight: 500; letter-spacing: -.045em; line-height: 1; margin-top: 6px; }
.state .tagline { font-size: clamp(1.15rem, 1.4vw, 1.35rem); letter-spacing: -.015em; line-height: 1.3; }
.state p:not(.tagline):not(.label) { color: var(--muted); max-width: 34ch; }
.state .text-link { align-self: flex-start; margin-top: auto; }
.state .label { color: var(--ink); }
.state .label em { font-style: normal; color: var(--muted); }

/* Fachliches Fundament */
.split { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--gap); }
.split-copy { grid-column: 1 / 6; display: flex; flex-direction: column; gap: 26px; align-items: flex-start; }
.split-copy h2 { margin-top: 10px; }
.split-copy p:not(.label) { max-width: 38ch; color: var(--muted); }

/* Bildunterschrift unter den drei Zuständen */
.caption { display: grid; grid-template-columns: repeat(3, 1fr); margin: 10px 0 0; font-family: var(--mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.caption span { padding-left: 2px; }

/* Kontakt und Formular */
.form { grid-column: 7 / 13; display: flex; flex-direction: column; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.field input, .field textarea {
  font: inherit; font-size: 1.1rem; color: var(--ink); background: transparent;
  border: 0; border-bottom: 1px solid var(--ink); border-radius: 0; padding: 8px 0 10px;
}
.field textarea { resize: vertical; min-height: 140px; border: 1px solid var(--rule); border-bottom-color: var(--ink); padding: 12px; }
.field input:focus-visible, .field textarea:focus-visible { outline: 2px solid var(--cyan-text); outline-offset: 4px; }
.trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-note { font-size: 14px; color: var(--muted); max-width: 52ch; }
.form-note a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.form .button { align-self: flex-start; }
.legal-body h2:first-child { margin-top: 0; }
.legal a:not(.text-link) { text-decoration: underline; text-underline-offset: 3px; }

/* Unterseiten */
.page-hero { padding: clamp(28px, 6vh, 72px) var(--pad) clamp(40px, 6vw, 80px); }
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 6rem); margin-top: clamp(18px, 3vh, 34px); max-width: 15ch; text-wrap: balance; }
.page-hero .lead { margin-top: clamp(24px, 3vw, 44px); margin-left: calc(100% / 12 * 6); max-width: 32ch; }

/* Rechtliche Seiten */
.legal { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--gap); padding: 0 var(--pad) clamp(72px, 9vw, 130px); }
.legal-body { grid-column: 1 / -1; max-width: 62ch; }
.legal h2 { font-size: 1.5rem; font-weight: 500; letter-spacing: -.02em; margin: 2.4em 0 .6em; }
.legal p { max-width: 62ch; }

/* Fuß: klar gegliedert */
.footer { background: var(--night); color: #d5dbd6; padding: clamp(56px, 7vw, 96px) var(--pad) 0; font-size: 15px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1.6fr 1fr 1fr; gap: 32px var(--gap); }
.footer-brand .brand { font-size: 34px; color: var(--paper); }
.footer-brand p { margin-top: 10px; font-family: var(--mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: #a9b6af; }
.footer-col { display: flex; flex-direction: column; align-items: flex-start; gap: 0; }
.footer-col .label { color: #a9b6af; margin-bottom: 8px; }
.footer-col a { padding: 6px 0; }
.footer-col a:hover { color: var(--paper); text-decoration: underline; text-underline-offset: 4px; }
.footer-mail { font-size: clamp(1.2rem, 1.6vw, 1.5rem); letter-spacing: -.02em; color: var(--paper); border-bottom: 1px solid var(--cyan); }
.footer-col .footer-mail { padding: 0; margin: 2px 0 14px; }
.footer-col p:not(.label) { color: #a9b6af; max-width: 28ch; }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px 32px;
  margin-top: clamp(48px, 6vw, 80px); padding: 20px 0 24px; border-top: 1px solid #34413b;
  font-size: 13px; color: #a9b6af;
}

/* Einblendungen */
.js [data-reveal] { transition: opacity .9s cubic-bezier(.2, .7, .2, 1), transform .9s cubic-bezier(.2, .7, .2, 1); }
.js [data-reveal].is-pending { opacity: 0; transform: translateY(28px); }

/* Breiten */
@media (max-width: 1080px) {
  .form { grid-column: 1 / -1; margin-top: 36px; }

  .section-head .label { grid-column: 1 / -1; padding-top: 0; }
  .section-head h2, .section-head h1, .section-head .lead { grid-column: 1 / -1; }
  .section-head .lead { margin-top: 8px; }

  .split-copy { grid-column: 1 / -1; }

  .legal-body { grid-column: 1 / -1; }
  .page-hero .lead { margin-left: calc(100% / 12 * 3); }
}

@media (max-width: 760px) {
  :root { --header: 72px; }
  body { font-size: 1rem; }
  .brand { font-size: 26px; }
  .header { flex-wrap: wrap; }
  .nav { flex-wrap: wrap; gap: 4px 18px; }
  .js .menu-button {
    display: inline-flex; align-items: center; gap: 10px;
    min-height: 44px; padding: 9px 16px; border: 1px solid var(--ink); border-radius: 999px; background: transparent;
    font-size: 14px; cursor: pointer;
  }
  .menu-button i { width: 12px; height: 8px; border-top: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transition: transform .2s; }
  .menu-open .menu-button i { transform: scaleY(.25); }
  .js .nav { display: none; width: 100%; flex-direction: column; align-items: stretch; gap: 0; padding: 6px 0 20px; font-size: 1.5rem; letter-spacing: -.03em; }
  .js .menu-open .nav { display: flex; }
  .js .nav a { padding: 12px 0; border-bottom: 1px solid var(--rule); }
  .js .nav a::after { display: none; }
  .js .nav .nav-contact, .js .nav .nav-contact[aria-current="page"] { border: 0; border-radius: 0; padding: 12px 0; border-bottom: 1px solid var(--rule); background: none; color: inherit; }
  .js .nav a[aria-current="page"] { color: var(--cyan-text); }
  .js .nav .lang { border-bottom: 0; padding-top: 16px; font-size: 14px; }
  .hero { min-height: 0; grid-template-rows: auto; padding-bottom: 24px; }
  .hero h1 { font-size: clamp(2.9rem, 14.2vw, 4.6rem); }
  .hero-intro { font-size: 1.15rem; margin-top: 22px; }
  .hero-flow { position: relative; inset: auto; height: clamp(250px, 78vw, 380px); margin: 10px calc(var(--pad) * -1) 0; --flow-fade: 0; }
  .hero-floor { padding-top: 8px; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 14px 24px; }
  .hero-floor .label { text-align: left; }

  .states-flow { height: 260px; }
  .states { grid-template-columns: 1fr; }
  .caption { font-size: 11px; letter-spacing: .04em; }
  .state, .state + .state { padding: 24px 0 30px; border-left: 0; border-top: 1px solid var(--rule); }
  .state:first-child { border-top: 0; }

  .page-hero .lead { margin-left: 0; }

  .footer-grid { grid-template-columns: 1fr 1fr; }

  .form { grid-column: 1 / -1; margin-top: 36px; }
  .js .nav .lang { border-bottom: 0; padding-top: 18px; font-size: 14px; }
  .footer-brand, .footer-col:nth-child(2) { grid-column: 1 / -1; }

}

@media (max-width: 400px) {
  .hero h1 { font-size: 13.4vw; }
  .page-hero h1 { font-size: 12.4vw; }
}

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal], .text-link .arrow { transition: none; }
}

@media print {
  .flow, .menu-button { display: none !important; }
   .footer { background: none; color: #000; }
}
.notfound-links { margin-top: 32px; display: flex; gap: 28px; flex-wrap: wrap; }
.notfound-legal a:hover { color: var(--paper); }
.page-hero-small .lead { margin-left: 0; max-width: 62ch; font-size: clamp(1.1rem, 1.4vw, 1.3rem); }
.legal p + p { margin-top: 1em; }

/* Einzelseiten, Stand 05.10.2026 */
.hero-quote h1 { font-size: clamp(2.6rem, 5.6vw, 6.2rem); line-height: 1; max-width: 15ch; }
.tech-page { padding-top: clamp(28px, 4vw, 56px); }
.tech-page .section-head { margin-bottom: clamp(16px, 2.5vw, 36px); }
.tech-page .section-head h1 { grid-column: 1 / -1; }

.field textarea { min-height: 110px; }
/* Kontakt im Format der übrigen Seiten */
.contact-page {
  position: relative; isolation: isolate; overflow: hidden;
  min-height: clamp(640px, calc(100svh - var(--header)), 960px);
  padding: clamp(24px, 5vh, 64px) var(--pad) clamp(28px, 4vh, 48px);
}
.contact-page .split { position: relative; z-index: 2; align-items: start; }
.contact-page h1 { font-size: clamp(2.6rem, 5.6vw, 6.2rem); line-height: 1; margin-top: clamp(18px, 3vh, 34px); }
.contact-page .hero-intro { margin-top: clamp(22px, 3.5vh, 40px); }

.contact-page .form { padding-top: clamp(26px, 4.5vh, 52px); gap: 22px; }
.contact-page .field textarea { border: 0; border-bottom: 1px solid var(--ink); padding: 8px 0 10px; min-height: 0; resize: vertical; }
.contact-flow { position: absolute; inset: 74% -1% 0 0; z-index: 1; --flow-fade: .4; }
@media (max-width: 1080px) {
  .contact-page { min-height: 0; display: flex; flex-direction: column; padding-bottom: 0; }
  .contact-page .split { order: 1; }
  .contact-flow { order: 2; position: relative; inset: auto; height: clamp(200px, 30vw, 300px); margin: 40px calc(var(--pad) * -1) 0; --flow-fade: 0; }
}
@media (max-width: 760px) { .contact-page .form { padding-top: 0; }
}
@media (min-width: 761px) { .hero-quote h1 > span { white-space: nowrap; }
}