* {
  box-sizing: border-box;
}

html {
  font-family: Arial, Helvetica, sans-serif;
  color: #333;
  background: #fff;
}

body {
  margin: 0;
  line-height: 1.6;
}

/* HEADER */

.site-header {
  background: #252525;
  height: 82px;
}

.header-inner {
  width: min(1180px, 92%);
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.logo {
  width: 145px;
  height: auto;
  display: block;
}

/* TITELBILD */

.hero {
  width: 100%;
  height: clamp(260px, 39vw, 560px);
  background-image: url("../images/header.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* INHALT */

.content-area {
  background:
    linear-gradient(rgba(0, 126, 190, 0.86), rgba(0, 126, 190, 0.86)),
    url("../images/background.png") center / cover no-repeat;
  padding: 70px 4%;
}

.cards {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.card {
  background: rgba(255, 255, 255, 0.96);
  padding: 34px 32px;
  border-radius: 3px;
  box-shadow: 0 3px 15px rgba(0, 0, 0, 0.12);
}

.card h1,
.card h2 {
  margin: 0 0 22px;
  font-size: 24px;
  line-height: 1.25;
  font-weight: 500;
  color: #333;
}

.card p {
  margin: 0 0 18px;
}

.card ul {
  margin: 0;
  padding-left: 20px;
}

.card li {
  margin-bottom: 8px;
}

/* FOOTER */

footer {
  background: #222;
  color: #aaa;
}

.footer-inner {
  width: min(1180px, 92%);
  margin: 0 auto;
  padding: 48px 0;
}

.footer-inner h2 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 18px;
}

.footer-inner nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 7px;
}

.footer-inner a {
  color: #aaa;
  text-decoration: none;
}

.footer-inner a:hover,
.footer-inner a:focus {
  color: #fff;
  text-decoration: underline;
}

.copyright {
  background: #0785c1;
  color: #fff;
  text-align: center;
  padding: 16px 4%;
  font-size: 13px;
}

/* TABLET */

@media (max-width: 900px) {
  .cards {
    grid-template-columns: 1fr;
    max-width: 680px;
  }

  .content-area {
    padding: 45px 5%;
  }
}

/* SMARTPHONE */

@media (max-width: 600px) {
  .site-header {
    height: 68px;
  }

  .logo {
    width: 120px;
  }

  .hero {
    height: 250px;
  }

  .content-area {
    padding: 30px 18px;
  }

  .card {
    padding: 26px 22px;
  }

  .card h1,
  .card h2 {
    font-size: 21px;
  }

  .footer-inner {
    padding: 35px 0;
  }
}

/* Feinanpassung Desktop */
@media (min-width: 901px) {
  .hero {
    height: 430px;
  }

  .cards {
    width: min(1250px, 94%);
    gap: 24px;
  }

  .card {
    padding: 32px 30px;
    font-size: 16px;
  }
}

/* Rechtliche Unterseiten */

.legal-page {
  background: #f5f5f5;
  padding: 55px 20px 70px;
}

.legal-content {
  max-width: 1000px;
  margin: 0 auto;
  background: #fff;
  padding: 45px 55px;
  box-shadow: 0 2px 12px rgba(0,0,0,.08);
}

.legal-content h1 {
  margin: 0 0 35px;
  font-size: 32px;
  font-weight: 500;
}

.legal-content h2 {
  margin: 32px 0 12px;
  font-size: 21px;
  font-weight: 500;
}

.legal-content p,
.legal-content li {
  font-size: 16px;
  line-height: 1.7;
}

.legal-content a {
  color: #0785c1;
}

@media (max-width: 600px) {
  .legal-page {
    padding: 25px 12px 40px;
  }

  .legal-content {
    padding: 28px 22px;
  }

  .legal-content h1 {
    font-size: 27px;
  }

  .legal-content h2 {
    font-size: 19px;
  }
}

/* Optische Annäherung an das ursprüngliche 3OS-Design */
@media (min-width: 901px) {

  .content-area {
    padding: 48px 4% 52px;
    background:
      linear-gradient(rgba(0, 72, 215, .78), rgba(0, 72, 215, .78)),
      url("../images/background.png") center / cover no-repeat;
  }

  .cards {
    width: 920px;
    max-width: 92%;
    gap: 18px;
    align-items: stretch;
  }

  .card {
    padding: 30px 25px;
    text-align: center;
    font-size: 14px;
    line-height: 1.65;
    min-height: 375px;
    border-radius: 3px;
    box-shadow: none;
  }

  .card h1,
  .card h2 {
    font-size: 21px;
    text-align: center;
    margin-bottom: 20px;
  }

  .card p {
    text-align: center;
  }

  .card ul {
    display: inline-block;
    text-align: left;
    padding-left: 18px;
  }

  .card li {
    margin-bottom: 6px;
  }
}

footer {
  background: #050505;
}

.footer-inner {
  padding-top: 42px;
  padding-bottom: 42px;
}

.copyright {
  background: #087ef5;
  padding: 17px 4%;
}

.copyright a {
  color: inherit;
  text-decoration: underline;
}

.copyright a:hover,
.copyright a:focus {
  color: #fff;
}

/* 3OS Minimal Design 2026 */

html {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
               "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  height: 72px;
  background: #1d1d1f;
}

.logo {
  width: 118px;
}

/* Inhaltsbereich */
.content-area {
  background:
    linear-gradient(
      135deg,
      rgba(0, 76, 190, .91),
      rgba(0, 122, 255, .88)
    ),
    url("../images/background.png") center / cover no-repeat;
}

/* Karten */
.card {
  background: rgba(255,255,255,.96);
  border: 1px solid rgba(255,255,255,.45);
  border-radius: 16px;
  box-shadow: 0 10px 35px rgba(0,0,0,.10);
}

.card h1,
.card h2 {
  font-weight: 600;
  letter-spacing: -.02em;
  color: #1d1d1f;
}

.card p,
.card li {
  color: #3a3a3c;
}

/* Footer */
footer {
  background: #1d1d1f;
}

.footer-inner {
  padding-top: 38px;
  padding-bottom: 38px;
}

.footer-inner h2 {
  font-size: 12px;
  letter-spacing: .04em;
}

.footer-inner a {
  color: #a1a1a6;
  transition: color .15s ease;
}

.footer-inner a:hover,
.footer-inner a:focus {
  color: #f5f5f7;
}

.copyright {
  background: #0071e3;
  font-size: 12px;
  padding: 13px 4%;
}

/* Desktop */
@media (min-width: 901px) {

  .content-area {
    padding-top: 52px;
    padding-bottom: 58px;
  }

  .cards {
    width: 980px;
    gap: 20px;
  }

  .card {
    padding: 34px 30px 38px;
    min-height: 370px;
  }

  .card h1,
  .card h2 {
    font-size: 22px;
  }
}

/* Mobile */
@media (max-width: 600px) {

  .site-header {
    height: 62px;
  }

  .logo {
    width: 105px;
  }

  .card {
    border-radius: 14px;
  }
}

/* Minimal Light Content */
.content-area {
  background: #f5f5f7;
}

.card {
  background: #ffffff;
  border: 1px solid rgba(0,0,0,.06);
  box-shadow: 0 8px 30px rgba(0,0,0,.06);
}

@media (min-width: 901px) {
  .content-area {
    padding-top: 64px;
    padding-bottom: 68px;
  }

  .cards {
    width: 1040px;
    gap: 22px;
  }

  .card {
    padding: 38px 34px 42px;
  }
}

/* Finales minimalistisches Feintuning */

.card,
.card p,
.card ul {
  text-align: left;
}

.card h1,
.card h2 {
  text-align: left;
  font-size: 23px;
  margin-bottom: 24px;
}

.card p,
.card li {
  font-size: 15px;
  line-height: 1.65;
}

.card ul {
  display: block;
  margin: 0;
}

.footer-inner {
  padding-top: 30px;
  padding-bottom: 30px;
}

@media (min-width: 901px) {
  .cards {
    width: 1120px;
    gap: 24px;
  }

  .card {
    padding: 40px 38px;
    min-height: 390px;
  }

  .content-area {
    padding-top: 58px;
    padding-bottom: 58px;
  }
}

/* 3OS Akzentfarbe für Überschriften */
.card h1,
.card h2 {
  color: #0071e3;
}

/* Footer kompakter */
.footer-inner {
  padding-top: 24px;
  padding-bottom: 24px;
}

.footer-inner h2 {
  margin-bottom: 12px;
}

.footer-inner nav {
  gap: 5px;
}

.copyright {
  padding-top: 10px;
  padding-bottom: 10px;
}