/* ===============================
   RESET & BASIS
=============================== */
:root {
  --color-primary: #0B3D3D;
  --color-accent: #00A3A3;
  --color-dark-gray: #1F2937;
  --color-light-gray: #F3F4F6;
  --radius: 8px;
  --radius-card: 12px;
  --max-width: 1200px;
}

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  color: var(--color-dark-gray);
  background-color: #fff;
  line-height: 1.6;
}

/* Container zentriert */
.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 0;
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
  outline: none;
}

/* Headings */
h1, h2, h3 {
  color: var(--color-primary);
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.5rem;
}

/* ===============================
   NAVIGATION
=============================== */
header {
  background-color: var(--color-light-gray);
  padding: 1rem 0;
}

.brand {
  font-size: 1.75rem;
  font-weight: bold;
  color: var(--color-primary);
  text-transform: uppercase;
}

nav {
  margin-top: 1rem;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-list li a {
  color: var(--color-dark-gray);
  padding: 0.5rem;
}

.nav-list li a:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ===============================
   HERO SECTION
=============================== */
.hero {
  background-color: var(--color-light-gray);
  padding: 4rem 0;
  text-align: center;
}

.hero-buttons {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: bold;
  text-align: center;
  transition: background-color 0.3s, color 0.3s;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
  border: none;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-primary);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--color-primary);
  color: #fff;
}

.btn:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ===============================
   SECTIONS
=============================== */
section {
  padding: 4rem 0;
}

/* ===============================
   KARTEN (LEISTUNGEN)
=============================== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background-color: #fff;
  border-radius: var(--radius-card);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  padding: 2rem;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* ===============================
   USP LISTE
=============================== */
.usp-section {
  background-color: var(--color-light-gray);
}

.usp-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.usp-list li {
  background: #fff;
  padding: 1.25rem;
  border-radius: var(--radius-card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  text-align: center;
}

/* ===============================
   REFERENZEN / LOGO BOXEN
=============================== */
.references .ref-logos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 2rem;
  justify-items: center;
}

.ref-logo {
  width: 120px;
  height: 60px;
  background: var(--color-light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--color-dark-gray);
}

/* ===============================
   PLATZHALTER-BILDER
=============================== */
.ph-image {
  width: 100%;
  height: 180px;
  background-color: #e0e0e0;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

/* ===============================
   FORMULAR
=============================== */
.contact-section form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: var(--radius);
  font-family: inherit;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.form-checkbox input {
  margin-top: 0.4rem;
}

/* ===============================
   FOOTER
=============================== */
footer {
  background-color: var(--color-light-gray);
  text-align: center;
  padding: 2rem 0;
  font-size: 0.9rem;
  color: var(--color-dark-gray);
}

/* ===============================
   RESPONSIVE
=============================== */
@media (max-width: 600px) {
  .hero-buttons {
    flex-direction: column;
  }
}