:root{
  --sidebar-blue:#3b78b3;
  --sidebar-hover:#346ca2;
  --white-line:rgba(255,255,255,.4);
  --text-dark:#1a202c;
}

*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',sans-serif;}
body{background-color:#f4f7f9;}

.tuzuk-container{display:flex;min-height:100vh;}

.sidebar{
  width:320px;
  background-color:var(--sidebar-blue);
  color:#fff;
  position:sticky;
  top:0;
  height:100vh;
  overflow-y:auto;
  flex-shrink:0;
  border-right:1px solid rgba(0,0,0,.1);
}

.sidebar-header{
  padding:25px 20px;
  font-size:1.1rem;
  font-weight:700;
  border-bottom:2px solid var(--white-line);
}

.nav-group{border-bottom:1px solid var(--white-line);}

.nav-btn{
  width:100%;
  padding:18px 20px;
  background:transparent;
  border:none;
  color:#fff;
  text-align:left;
  cursor:pointer;
  font-size:.95rem;
  font-weight:600;
  transition:.2s;
}

.nav-btn:hover{background:var(--sidebar-hover);}

.nav-btn.disabled{
  opacity:.55;
  cursor:not-allowed;
}
.nav-btn.disabled:hover{background:transparent;}

.main-content{
  flex:1;
  padding:40px;
  display:flex;
  justify-content:center;
}

.document-card{
  background:#fff;
  width:100%;
  max-width:850px;
  padding:50px;
  box-shadow:0 4px 15px rgba(0,0,0,.05);
  border-radius:4px;
  line-height:1.8;
  color:#334155;
}

.section-title{text-align:center;margin-bottom:18px;}
.section-title h1{
  font-size:1.6rem;
  color:var(--text-dark);
  margin-top:10px;
  text-transform:uppercase;
}
.section-title h2{
  font-size:1rem;
  color:var(--sidebar-blue);
}

.madde-header{
  font-weight:700;
  color:var(--sidebar-blue);
  margin-top:26px;
  border-bottom:1px solid #eee;
  padding-bottom:5px;
  font-size:1.05rem;
}

.hidden{display:none;}
.active{display:block;}

p{margin-bottom:14px;text-align:justify;}

.vurgu-box{
  background:#f0f7ff;
  border-left:5px solid var(--sidebar-blue);
  padding:18px;
  margin:18px 0;
  font-style:italic;
}