/* ─────────────────────────────────────────────────────────────
   Ingenieurbüro Dennis Hunger – Stylesheet
   ───────────────────────────────────────────────────────────── */

/* ── CUSTOM PROPERTIES ──────────────────────────────────────── */
:root {
  --clr-bg:         #f5f6f8;
  --clr-surface:    #ffffff;
  --clr-dark:       #1a1e26;
  --clr-darker:     #111418;
  --clr-text:       #2c3040;
  --clr-muted:      #6b7280;
  --clr-accent:     #1e6fa8;
  --clr-accent-lt:  #2585c8;
  --clr-accent-dim: #e8f1f8;
  --clr-border:     #dde1e8;

  --radius:         8px;
  --radius-lg:      14px;
  --shadow-sm:      0 1px 4px rgba(0,0,0,.07);
  --shadow-md:      0 4px 20px rgba(0,0,0,.09);
  --shadow-lg:      0 8px 40px rgba(0,0,0,.12);

  --nav-h:          68px;
  --transition:     0.25s ease;
  --font:           'Inter', system-ui, sans-serif;

  --max-w:          1120px;
  --gutter:         clamp(1.25rem, 5vw, 2.5rem);
}

/* ── RESET ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: 1rem; }

/* ── UTILITY ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 2rem;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn--primary {
  background: var(--clr-accent);
  color: #fff;
  box-shadow: 0 2px 10px rgba(30,111,168,.35);
}
.btn--primary:hover {
  background: var(--clr-accent-lt);
  transform: translateY(-2px);
  box-shadow: 0 4px 18px rgba(30,111,168,.45);
}
.btn--full { width: 100%; }

.section {
  padding-block: clamp(4rem, 8vw, 7rem);
}
.section__title {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--clr-darker);
  margin-bottom: .75rem;
  text-align: center;
}
.section__title--left { text-align: left; }
.section__sub {
  font-size: 1.05rem;
  color: var(--clr-muted);
  max-width: 600px;
  margin-inline: auto;
  text-align: center;
  margin-bottom: 3rem;
}

/* ── NAVIGATION ─────────────────────────────────────────────── */
.nav {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(17, 20, 24, .92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: background var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(17, 20, 24, .98);
  box-shadow: 0 2px 16px rgba(0,0,0,.3);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav__logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.nav__logo-main {
  font-size: .65rem;
  font-weight: 500;
  color: rgba(255,255,255,.5);
  letter-spacing: .14em;
  text-transform: uppercase;
}
.nav__logo-name {
  font-size: .9rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .01em;
  white-space: nowrap;
}
.nav__links {
  display: flex;
  gap: 2.25rem;
}
.nav__links a {
  color: rgba(255,255,255,.75);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .02em;
  transition: color var(--transition);
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 2px;
  background: var(--clr-accent);
  transition: width var(--transition);
}
.nav__links a:hover { color: #fff; }
.nav__links a:hover::after { width: 100%; }

/* Burger */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.nav__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── HERO ───────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 72svh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(160deg, #111418 0%, #1a2535 55%, #0d1b2e 100%);
  overflow: hidden;
  padding-block: calc(var(--nav-h) + 2.5rem) 3.5rem;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse 70% 60% at 80% 40%, rgba(30,111,168,.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 10% 80%, rgba(30,111,168,.08) 0%, transparent 60%);
  pointer-events: none;
}
/* subtle grid pattern */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.hero__content {
  position: relative;
  z-index: 1;
  max-width: 780px;
}
.hero__eyebrow {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 1.25rem;
}
.hero__headline {
  font-size: clamp(2rem, 5.5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: #ffffff;
  letter-spacing: -.02em;
  margin-bottom: 1.5rem;
}
.hero__sub {
  font-size: clamp(.95rem, 1.5vw, 1.15rem);
  color: rgba(255,255,255,.65);
  max-width: 560px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

/* ── LEISTUNGEN / CARDS ─────────────────────────────────────── */
.leistungen { background: var(--clr-bg); }
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
}
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-accent);
}
.card__icon {
  width: 52px;
  height: 52px;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  padding: 10px;
}
.card__icon svg { width: 100%; height: 100%; }
.card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--clr-darker);
  margin-bottom: .6rem;
}
.card__text {
  font-size: .9rem;
  color: var(--clr-muted);
  line-height: 1.6;
}

/* ── ÜBER UNS ───────────────────────────────────────────────── */
.ueber-uns {
  background: var(--clr-surface);
}
.ueber-uns__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.ueber-uns__text p {
  color: var(--clr-muted);
  margin-bottom: 1rem;
  font-size: .97rem;
}
.ueber-uns__facts {
  display: flex;
  gap: 2.5rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.fact__value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--clr-accent);
  letter-spacing: -.03em;
  line-height: 1;
}
.fact__label {
  display: block;
  font-size: .78rem;
  font-weight: 500;
  color: var(--clr-muted);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-top: .3rem;
}
.ueber-uns__photo {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 3 / 4;
  max-height: 520px;
}
.ueber-uns__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

/* ── LEISTUNGSMERKMALE ──────────────────────────────────────── */
.merkmale {
  background: linear-gradient(135deg, #111418 0%, #1a2535 100%);
  padding-block: 3rem;
  border-top: 1px solid rgba(255,255,255,.06);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.merkmale__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem 2.5rem;
}
.merkmal {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.merkmal__icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  color: var(--clr-accent);
  margin-top: 2px;
}
.merkmal__icon svg { width: 100%; height: 100%; }
.merkmal strong {
  display: block;
  font-size: .92rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: .3rem;
}
.merkmal p {
  font-size: .82rem;
  color: rgba(255,255,255,.5);
  line-height: 1.55;
  margin: 0;
}

/* ── KONTAKT ────────────────────────────────────────────────── */
.kontakt {
  background: var(--clr-bg);
}
.kontakt__inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: start;
}
.kontakt__info p {
  color: var(--clr-muted);
  margin-bottom: 2rem;
  font-size: .97rem;
}
.kontakt__details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.kontakt__item {
  display: flex;
  align-items: flex-start;
  gap: .85rem;
}
.kontakt__item svg {
  width: 22px;
  height: 22px;
  color: var(--clr-accent);
  flex-shrink: 0;
  margin-top: 2px;
}
.kontakt__item strong {
  display: block;
  font-size: .8rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--clr-muted);
  margin-bottom: .2rem;
}
.kontakt__item a {
  color: var(--clr-text);
  font-size: .95rem;
  line-height: 1.5;
  transition: color var(--transition);
}
.kontakt__item a:hover { color: var(--clr-accent); }

/* Form */
.kontakt__form {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.form-group label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--clr-text);
  letter-spacing: .03em;
}
.form-group input,
.form-group textarea {
  padding: .7rem 1rem;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-bg);
  color: var(--clr-text);
  font-size: .93rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(30,111,168,.12);
}
.form-group input.invalid,
.form-group textarea.invalid {
  border-color: #e05252;
}
.form-group--privacy label { font-size: .85rem; font-weight: 400; color: var(--clr-muted); }
.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  cursor: pointer;
}
.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--clr-accent);
}
.checkbox-label .link { color: var(--clr-accent); }

/* Spinner */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Form status */
.form-status {
  font-size: .88rem;
  padding: .6rem .9rem;
  border-radius: var(--radius);
  display: none;
}
.form-status.success {
  display: block;
  background: #e6f4ea;
  color: #2e7d32;
  border: 1px solid #a5d6a7;
}
.form-status.error {
  display: block;
  background: #fdecea;
  color: #c62828;
  border: 1px solid #ef9a9a;
}

/* ── FOOTER ─────────────────────────────────────────────────── */
.footer {
  background: var(--clr-darker);
  padding-block: 1.75rem;
  border-top: 1px solid rgba(255,255,255,.06);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__copy {
  font-size: .83rem;
  color: rgba(255,255,255,.4);
}
.footer__links {
  display: flex;
  gap: 1.75rem;
}
.footer__links a {
  font-size: .83rem;
  color: rgba(255,255,255,.4);
  transition: color var(--transition);
}
.footer__links a:hover { color: rgba(255,255,255,.8); }

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  .ueber-uns__inner { grid-template-columns: 1fr; }
  .ueber-uns__photo { max-height: 380px; aspect-ratio: 4 / 3; }
  .kontakt__inner { grid-template-columns: 1fr; }
  .merkmale__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 580px) {
  .merkmale__grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav__links {
    position: fixed;
    inset-block: var(--nav-h) 0;
    inset-inline: 0;
    background: rgba(17,20,24,.97);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    transform: translateX(100%);
    transition: transform .3s ease;
  }
  .nav__links.open { transform: translateX(0); }
  .nav__links a { font-size: 1.2rem; }
  .nav__burger { display: flex; }

  .form-row { grid-template-columns: 1fr; }

  .ueber-uns__facts { gap: 1.5rem; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}