* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

/* ARKA PLAN – ASLA BOZULMAZ */
body {
  min-height: 100vh;
  background: url("lobby.jpg") no-repeat center center fixed;
  background-size: cover;
  color: white;
}

/* KARARTMA */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: -1;
}

/* ÜST ALAN */
header {
  text-align: center;
  padding: 40px 20px;
}

header h1 {
  font-size: 36px;
}

header p {
  max-width: 700px;
  margin: 15px auto;
  font-size: 16px;
}

/* DİL */
.language a {
  color: white;
  margin: 0 6px;
  text-decoration: none;
  font-weight: bold;
}

/* TAB */
.tab {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}

.tab button {
  padding: 10px 18px;
  border: none;
  cursor: pointer;
  background: #ffffffcc;
  border-radius: 6px;
}

.tab button.active {
  background: #f1c40f;
}

/* İÇERİK */
.tabcontent {
  display: none;
  background: rgba(255,255,255,0.95);
  color: black;
  max-width: 900px;
  margin: 30px auto;
  padding: 20px;
  border-radius: 12px;
}

/* RESİMLER */
.tabcontent img {
  width: 100%;
  max-width: 400px;
  height: auto;
  display: block;
  margin: 15px auto;
  border-radius: 10px;
}

/* FOOTER */
footer {
  text-align: center;
  margin: 40px 0;
}

footer a {
  display: inline-block;
  margin: 10px;
  padding: 10px 18px;
  background: #25d366;
  color: white;
  border-radius: 6px;
  text-decoration: none;
}