/* Operandis v1.2 — Direction C "Origin"
   Dark theme, Questrial typography, green accent
   ============================================ */

/* ---- Font ---- */
@font-face {
  font-family: 'Questrial';
  src: url('../fonts/Questrial-Regular.woff2') format('woff2'),
       url('../fonts/Questrial-Regular.woff') format('woff');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ---- Tokens (CSS variables) ---- */
:root {
  --bg:        #0E0E0E;
  --surface:   #151515;
  --surface2:  #1C1C1C;
  --border:    #222222;
  --border2:   #2E2E2E;
  --text-hi:   #F0F0F0;
  --text-mid:  #8A8A8A;
  --text-lo:   #4A4A4A;
  --green:     #39FF14;
  --green-dim: rgba(57, 255, 20, 0.15);

  --pad-x:     56px;
  --pad-x-sm:  24px;
  --maxw:      1440px;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text-hi);
  font-family: 'Questrial', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { margin: 0; font-weight: 400; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ---- Skip link (a11y) ---- */
.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--green); color: var(--bg);
  padding: 12px 16px; font-size: 12px; letter-spacing: 0.1em;
  text-transform: uppercase; z-index: 200;
}
.skip:focus { left: 0; }

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--pad-x);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav__logo {
  font-size: 30px; line-height: 1; letter-spacing: -0.01em;
  color: var(--text-hi);
}
.nav__logo .dot { color: var(--green); }
.dot { color: var(--green); }
.nav__links { display: flex; gap: 40px; align-items: center; }
.nav__link {
  background: none; border: none; cursor: pointer;
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-mid);
  padding: 2px 0; border-bottom: 1px solid transparent;
  transition: color 150ms, border-color 150ms;
  text-decoration: none;
}
.nav__link:hover { color: var(--text-hi); }
.nav__link.is-active {
  color: var(--text-hi);
  border-bottom-color: var(--green);
}
.nav__toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 32px; height: 32px; padding: 0;
  color: var(--text-hi);
}
.nav__toggle svg { width: 100%; height: 100%; }

/* ---- Footer ---- */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.footer__grid {
  padding: 56px var(--pad-x) 40px;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 48px;
}
.footer__brand-line {
  font-size: 13px; color: var(--text-lo);
  margin-top: 16px; line-height: 1.8;
}
.footer__addr {
  font-size: 13px; color: var(--text-mid); line-height: 1.9;
}
.footer__addr a { color: var(--green); }
.footer__addr a:hover { text-decoration: underline; }
.footer__legal {
  text-align: right;
  font-size: 11px; color: var(--text-lo);
  letter-spacing: 0.06em; text-transform: uppercase;
  line-height: 2;
}
.footer__legal a { color: var(--text-lo); }
.footer__legal a:hover { color: var(--text-mid); }

/* ---- Generic page header (used on inner pages) ---- */
.page-head {
  padding: 80px var(--pad-x) 56px;
  border-bottom: 1px solid var(--border);
}
.page-head__eyebrow {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--text-lo); margin-bottom: 20px;
}
.page-head__h1 {
  font-size: clamp(40px, 6vw, 64px); color: var(--text-hi); line-height: 1;
}
.page-head__sub {
  font-size: 15px; color: var(--text-mid);
  margin-top: 20px; max-width: 560px; line-height: 1.7;
}

/* =========================================================
   HOME
   ========================================================= */

/* Hero */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex; flex-direction: column; justify-content: flex-end;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0.25;
}
.hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top,
    rgba(14,14,14,1) 0%,
    rgba(14,14,14,0.2) 60%,
    transparent 100%);
}
.hero__content {
  position: relative; z-index: 1;
  padding: 0 var(--pad-x) 72px;
  max-width: 860px;
}
.hero__h1 {
  font-size: clamp(48px, 6.5vw, 88px);
  line-height: 1.0; color: var(--text-hi); margin-bottom: 28px;
}
.hero__lead {
  font-size: clamp(20px, 2.4vw, 32px); color: var(--text-mid);
  line-height: 1.55; max-width: 680px;
}

/* Why-section */
.why {
  padding: 80px var(--pad-x);
  border-top: 1px solid var(--border);
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 80px; align-items: center;
}
.why__eyebrow {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--text-lo); margin-bottom: 24px;
}
.why__h2 {
  font-size: clamp(28px, 3.4vw, 38px);
  color: var(--text-hi); line-height: 1.1; margin-bottom: 28px;
}
.why__p {
  font-size: clamp(18px, 2.1vw, 28px); color: var(--text-mid); line-height: 1.6;
  margin-bottom: 20px;
}
.why__p:last-child { margin-bottom: 0; }
.why__img-wrap {
  background: var(--surface2);
  aspect-ratio: 4/3;
  position: relative; overflow: hidden;
}
.why__img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

/* Services */
.svc {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 80px var(--pad-x);
}
.svc__head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 56px; gap: 24px;
}
.svc__title {
  font-size: clamp(26px, 3vw, 34px); color: var(--text-hi);
}
.svc__label {
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-lo);
}
.svc__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--border);
}
.svc__card {
  background: var(--surface);
  padding: 40px 36px;
}
.svc__num {
  font-size: clamp(20px, 2.4vw, 33px); color: var(--green);
  letter-spacing: 0.12em; margin-bottom: 20px;
}
.svc__name {
  font-size: clamp(32px, 3.6vw, 48px); color: var(--text-hi);
  margin-bottom: 20px; line-height: 1.05;
}
.svc__desc {
  font-size: clamp(16px, 1.9vw, 26px); color: var(--text-mid);
  line-height: 1.6; margin-bottom: 28px;
}
.svc__cta {
  font-size: 11px; color: var(--text-lo);
  letter-spacing: 0.1em; text-transform: uppercase;
  border-bottom: 1px solid var(--text-lo);
  display: inline-block; padding-bottom: 2px;
  transition: color 150ms, border-color 150ms;
}
.svc__cta:hover { color: var(--text-hi); border-bottom-color: var(--green); }
.svc__cta .dot { color: var(--green); }

/* Contact CTA strip */
.cta-strip {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 72px var(--pad-x);
  display: flex; justify-content: space-between; align-items: center;
  gap: 32px; flex-wrap: wrap;
}
.cta-strip__eyebrow {
  font-size: 11px; color: var(--text-lo);
  letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 16px;
}
.cta-strip__h {
  font-size: clamp(28px, 3.4vw, 36px); color: var(--text-hi);
}
.cta-strip__h .dot { color: var(--green); }
.cta-strip__mail {
  font-size: 18px; color: var(--green);
  border-bottom: 1px solid rgba(57,255,20,0.3); padding-bottom: 4px;
  transition: border-color 150ms;
}
.cta-strip__mail:hover { border-bottom-color: var(--green); }

/* =========================================================
   SERVICES PAGE (4 items, list layout)
   ========================================================= */
.svc-row {
  display: grid; grid-template-columns: 80px 320px 1fr;
  gap: 48px; padding: 56px var(--pad-x);
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.svc-row__num {
  font-size: clamp(20px, 2.4vw, 33px); color: var(--green);
  letter-spacing: 0.1em; padding-top: 5px;
}
.svc-row__title {
  font-size: clamp(34px, 4.0vw, 52px); color: var(--text-hi); line-height: 1.05;
}
.svc-row__desc {
  font-size: clamp(16px, 1.9vw, 26px); color: var(--text-mid);
  line-height: 1.6; margin-bottom: 24px;
}
.svc-row__tags {
  font-size: clamp(14px, 1.6vw, 22px); color: var(--green);
  letter-spacing: 0.04em; line-height: 1.5;
}

/* =========================================================
   REFERENZEN
   ========================================================= */
.refs-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border);
  margin: 0;
}
.ref-card {
  background: var(--surface);
  aspect-ratio: 4/3;
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 28px 28px 24px;
  position: relative; overflow: hidden;
  transition: background 200ms;
}
.ref-card:hover { background: var(--surface2); }
.ref-card__top {
  display: flex; justify-content: space-between; align-items: flex-start;
}
.ref-card__num {
  font-size: 11px; color: var(--green); letter-spacing: 0.1em;
}
.ref-card__type {
  font-size: 11px; color: var(--text-lo);
  letter-spacing: 0.08em; text-transform: uppercase;
}
.ref-card__name {
  font-size: 18px; color: var(--text-hi); margin-bottom: 6px;
}
.ref-card__year {
  font-size: 11px; color: var(--text-lo);
}

/* =========================================================
   TEAM
   ========================================================= */
.team-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1px; background: var(--border);
}
.team-card {
  background: var(--surface);
  padding: 56px;
}
.team-card__photo {
  width: 100%; max-width: 600px;
  aspect-ratio: 1/1;
  margin-bottom: 32px;
  overflow: hidden;
  border: 1px solid var(--border2);
}
.team-card__photo img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center top;
  filter: grayscale(100%);
  transition: filter 400ms;
}
.team-card:hover .team-card__photo img { filter: grayscale(60%); }
.team-card__name {
  font-size: 26px; color: var(--text-hi); margin-bottom: 8px;
}
.team-card__role {
  font-size: 11px; color: var(--green);
  letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 24px;
}
.team-card__bio {
  font-size: 14px; color: var(--text-mid); line-height: 1.8;
  max-width: 700px;
}

/* =========================================================
   KONTAKT
   ========================================================= */
.contact {
  padding: 80px var(--pad-x);
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 96px;
}
.contact__eyebrow {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--text-lo); margin-bottom: 24px;
}
.contact__h1 {
  font-size: clamp(36px, 5vw, 52px);
  color: var(--text-hi); line-height: 1.05; margin-bottom: 48px;
}
.contact__h1 .dot { color: var(--green); }
.contact__block { margin-bottom: 36px; }
.contact__block:last-child { margin-bottom: 0; }
.contact__label {
  font-size: 11px; color: var(--green);
  letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 10px;
}
.contact__value {
  font-size: 18px; color: var(--text-hi);
}
.contact__addr {
  font-size: 14px; color: var(--text-mid); line-height: 1.8;
}
a.contact__value:hover { color: var(--green); }

/* Form */
.form { display: flex; flex-direction: column; gap: 28px; padding-top: 20px; }
.form__row label {
  display: block;
  font-size: 11px; color: var(--text-lo);
  letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 10px;
}
.form__input,
.form__textarea {
  width: 100%;
  background: none; border: none;
  border-bottom: 1px solid var(--border2);
  padding: 14px 0;
  font-family: inherit; font-size: 15px;
  color: var(--text-hi); outline: none;
  transition: border-color 200ms;
}
.form__input:focus,
.form__textarea:focus { border-bottom-color: var(--green); }
.form__textarea { resize: vertical; min-height: 110px; }
/* Honeypot — hidden from humans */
.form__hp {
  position: absolute; left: -9999px;
  width: 1px; height: 1px; opacity: 0;
}
.form__submit {
  align-self: flex-start;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--bg); background: var(--text-hi);
  border: none; padding: 14px 32px;
  cursor: pointer;
  transition: background 200ms, color 200ms;
}
.form__submit:hover { background: var(--green); }

/* Form: success / error banner */
.form__msg {
  padding: 24px 28px; margin-bottom: 24px;
  border: 1px solid var(--border2);
  font-size: 14px; line-height: 1.6;
}
.form__msg--ok { border-color: var(--green); color: var(--text-hi); }
.form__msg--ok .dot { color: var(--green); }
.form__msg--err { border-color: #803333; color: #f0c4c4; }

/* =========================================================
   IMPRESSUM / DATENSCHUTZ (text pages)
   ========================================================= */
.legal {
  padding: 64px var(--pad-x) 96px;
  max-width: 820px;
}
.legal h2 {
  font-size: 22px; color: var(--text-hi);
  margin: 40px 0 16px; line-height: 1.3;
}
.legal h2:first-of-type { margin-top: 0; }
.legal p {
  font-size: 14px; color: var(--text-mid);
  line-height: 1.8; margin-bottom: 16px;
}
.legal a { color: var(--green); }
.legal a:hover { text-decoration: underline; }
.legal ul {
  padding-left: 20px; color: var(--text-mid);
  font-size: 14px; line-height: 1.8;
}

/* =========================================================
   404
   ========================================================= */
.notfound {
  min-height: 70vh;
  display: flex; flex-direction: column;
  justify-content: center; align-items: flex-start;
  padding: 96px var(--pad-x);
}
.notfound__eyebrow {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--green); margin-bottom: 20px;
}
.notfound__h1 {
  font-size: clamp(48px, 7vw, 88px);
  color: var(--text-hi); line-height: 1; margin-bottom: 24px;
}
.notfound__p {
  font-size: 16px; color: var(--text-mid);
  line-height: 1.7; max-width: 480px; margin-bottom: 32px;
}
.notfound__back {
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-hi);
  border-bottom: 1px solid var(--green);
  padding-bottom: 4px;
}

/* =========================================================
   RESPONSIVE — tablet and mobile
   ========================================================= */
@media (max-width: 960px) {
  :root { --pad-x: 32px; }

  .nav { padding: 0 32px; }
  .nav__links {
    display: none;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column; gap: 0;
    padding: 16px 32px 24px;
  }
  .nav__links.is-open { display: flex; }
  .nav__link {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav__link:last-child { border-bottom: none; }
  .nav__link.is-active { border-bottom-color: var(--border); color: var(--green); }
  .nav__toggle { display: block; }

  .hero__content { padding: 0 32px 56px; }
  .why { grid-template-columns: 1fr; gap: 40px; padding: 64px 32px; }
  .svc { padding: 64px 32px; }
  .svc__grid { grid-template-columns: 1fr; }
  .cta-strip { padding: 48px 32px; flex-direction: column; align-items: flex-start; }

  .svc-row {
    grid-template-columns: 56px 1fr;
    gap: 24px; padding: 40px 32px;
  }
  .svc-row__title { grid-column: 2; }
  .svc-row > div:last-child { grid-column: 2; }

  .refs-grid { grid-template-columns: repeat(2, 1fr); }

  .team-grid { grid-template-columns: 1fr; }
  .team-card { padding: 40px 32px; }
  .team-card__photo { max-width: none; }

  .contact { grid-template-columns: 1fr; gap: 56px; padding: 64px 32px; }

  .footer__grid {
    grid-template-columns: 1fr; gap: 32px;
    padding: 48px 32px 32px;
  }
  .footer__legal { text-align: left; }

  .page-head { padding: 56px 32px 40px; }
}

@media (max-width: 560px) {
  :root { --pad-x: 20px; }
  .hero { min-height: 78vh; }
  .hero__h1 { font-size: clamp(34px, 9.5vw, 46px); line-height: 1.05; }
  /* On mobile we keep the <br> as a space; CSS rule above tolerates wrap */
  .hero__h1 br { display: none; }
  .hero__content { padding: 0 20px 40px; }
  .nav { padding: 0 20px; }
  .nav__links { padding: 16px 20px 24px; }
  .why { padding: 48px 20px; }
  .svc { padding: 48px 20px; }
  .cta-strip { padding: 40px 20px; }
  .svc-row { padding: 32px 20px; gap: 20px; }
  .refs-grid { grid-template-columns: 1fr; }
  .team-card { padding: 32px 20px; }
  .contact { padding: 48px 20px; gap: 40px; }
  .footer__grid { padding: 40px 20px 24px; }
  .page-head { padding: 48px 20px 32px; }
  .legal { padding: 48px 20px 64px; }
  .notfound { padding: 64px 20px; }
}