html {
  /* px means "pixels". The base font size is now 10 pixels high */
  font-size: 10px;
  /* Replace PLACEHOLDER with the font-family property value you got from Google Fonts */
   font-family: "Inter", sans-serif;
  font-optical-sizing: auto;
  font-weight: <weight>;
  font-style: normal;
}

h1 {
  font-size: 60px;
  text-align: center;
}

h6 {
  font-size: 25px;
  margin: 0 0 5px 0;

}


p,
li {
  font-size: 16px;
  line-height: 2;
  letter-spacing: 1px;
}

html {
  background-color: #6b6c6a;
}


body {
  width: 1100px;
  margin: 0 auto;
  background-color: #b5f2f4;
  padding: 0 20px 20px 20px;
  border: 5px solid black;
}
h1 {
  margin: 0;
  padding: 20px 0;
  color: #000000;
  text-shadow: 3px 3px 1px rgb(248, 252, 0);
}



.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;

    display: flex;
    align-items: center;
    justify-content: space-between;

    height: 40px;
    background-color: #d2d2d2;
    padding: 0 20px;
}

.navbar a {
    color: rgb(0, 0, 0);
    text-align: center;
    padding: 14px 10px;
    text-decoration: none;
}

.header {
  padding: 20px;
  text-align: center;
  background: #1abc9c;
  color: white;
}

.card-container{
    display:flex;
    justify-content:center;
    gap:50px;             
    flex-wrap:wrap;  
    text-align: center;      
}

.flip-card{
    width:250px;
    height:180px;
    perspective:1000px;
}

.flip-card-inner{
    position:relative;
    width:100%;
    height:100%;
    transition:transform 0.8s;
    transform-style:preserve-3d;
}

.flip-card:hover .flip-card-inner{
    transform:rotateY(180deg);
}

.flip-card-front,
.flip-card-back{
    position:absolute;
    width:100%;
    height:100%;
    border-radius:15px;
    backface-visibility:hidden;

    display:flex;
    justify-content:center;
    align-items:center;

    font-size:20px;
    color:white;
    box-shadow:0 px 15px rgba(0,0,0,0.2);
}

.flip-card-front{
    background:#3498db;
}

.flip-card-back{
    background:#2ecc71;
    transform:rotateY(180deg);
}



.skill {
    padding: 25px 0;
    border-bottom: 1px solid #ddd;
}

.skill h3 {
    font-size: 25px;
    margin: 0;
    letter-spacing: 2px;
    color: #1abc9c;
}

.skill p {
    margin: 8px 0 0;
    font-size: 18px;
    color: #666;
}

.skill p {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin: 0;
    transition: all 0.3s ease;
}

.skill:hover p {
    max-height: 50px;
    opacity: 1;
    margin-top: 10px;
}


.learning {
    max-width: 900px;
    margin: 0 ;
    
}



.topic-header {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 25px;
}

.topic-number {
    font-size: 13px;
    opacity: 0.5;
}

.topic-header h3 {
    margin: 0;
    font-size: 24px;
    font-weight: 500;
}

details {
    border-top: 1px solid #070404;
}

summary {
    padding: 18px 0;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
}

label {
    display: block;
    padding: 8px 0;
    font-size: 14px;
    cursor: pointer;
}

input[type="checkbox"] {
    margin-right: 10px;
}






.quotes {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 20px;
}


.quote-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.quote-box {
    border: 1px solid #060606;
    padding: 35px;
    min-height: 180px;

    display: flex;
    flex-direction: column;
    justify-content: space-between;

    transition: transform 0.2s ease;
}

.quote-box:hover {
    transform: translateY(-3px);
}

.quote {
    margin: 0;
    font-size: 20px;
    line-height: 1.5;
}

.author {
    margin: 30px 0 0;
    font-size: 13px;
    opacity: 0.5;
}

@media (max-width: 600px) {

    .quote-grid {
        grid-template-columns: 1fr;
    }

    .quote-box {
        padding: 25px;
    }

    .quote {
        font-size: 18px;
    }

}