html {
    overflow-x: hidden;
    }
body {
    font-family:'Lexend',Poppins,Arial,sans-serif;
    background:#171c2c url(../assets/background.png) center/cover no-repeat fixed;
    color:#ffffff;
    min-height:calc(100vh - 4em);
    padding:2em;
    margin:0;
    display:grid;
    place-items:center;
    text-align:center;
    overflow-x: hidden;
    max-width:100vw;
    }
    h1,h2 {
    margin:0;
    color:#ffffff;
    }
    h1 {
    color:#2ab7ff;
    font-size:2.25em
    }
    h2 {
    color:#ffffff;
    }
    a {
    text-decoration:none;
    }
    main > img {
    margin:0 auto;
    max-width:200px;
    margin-bottom:1em
    }
    main {
    max-width:520px;
    width:100%;
    min-width:0;
    box-sizing:border-box;
    }
    main > p.intro {
    color:rgba(255,255,255,0.85);
    margin:0.5em 0 1.5em;
    font-size:0.9em;
    }
    .app-section {
    width:100%;
    margin-top:1.5em;
    }
    .choice-cards {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:1em;
    margin-top:1.5em;
    width:100%;
    min-width:0;
    }
    .choice-cards.hidden {
    display:none;
    }
    .choice-card {
    aspect-ratio:1;
    min-height:140px;
    min-width:0;
    border:none;
    border-radius:12px;
    background:#00235e;
    color:#fff;
    font-family:inherit;
    font-size:1.05em;
    font-weight:600;
    cursor:pointer;
    transition:all 0.3s ease;
    border:1px solid rgba(42,183,255,0.3);
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    padding:1em;
    }
    .choice-card:hover {
    background:#004e8f;
    color:#2ab7ff;
    transform:translateY(-2px);
    box-shadow:0 6px 16px rgba(42,183,255,0.3);
    border-color:#2ab7ff;
    }
    .tab-panel {
    display:none;
    width:100%;
    margin-top:1em;
    }
    .tab-panel.active {
    display:block;
    }
    .panel-back {
    display:inline-block;
    margin-bottom:1em;
    padding:0.5em 1em;
    border:1px solid rgba(42,183,255,0.5);
    border-radius:8px;
    background:transparent;
    color:#2ab7ff;
    font-family:inherit;
    font-size:0.9em;
    cursor:pointer;
    transition:all 0.2s ease;
    }
    .panel-back:hover {
    background:rgba(0,78,143,0.3);
    }
    .app-section:first-of-type { margin-top:0; }
    .section-title {
    font-size:1.1em;
    color:#2ab7ff;
    margin:0 0 0.75em;
    font-weight:600;
    }
    .apps--cards {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:1em;
    min-width:0;
    }
    .app-card {
    display:flex;
    flex-direction:column;
    align-items:center;
    text-align:center;
    padding:1.25em 1em;
    border-radius:12px;
    background:#00235e;
    color:#fff;
    text-decoration:none;
    transition:all 0.3s ease;
    border:1px solid rgba(42,183,255,0.25);
    }
    .app-card:hover {
    background:#004e8f;
    transform:translateY(-2px);
    box-shadow:0 6px 16px rgba(42,183,255,0.3);
    border-color:rgba(42,183,255,0.5);
    }
    .app-card h3 {
    margin:0 0 0.4em;
    font-size:0.95em;
    color:#2ab7ff;
    font-weight:600;
    }
    .app-card p {
    margin:0 0 0.75em;
    font-size:0.8em;
    color:rgba(255,255,255,0.85);
    line-height:1.4;
    }
    .app-card__btn {
    display:inline-block;
    font-size:0.8em;
    font-weight:500;
    color:#2ab7ff;
    padding:0.35em 0.75em;
    border-radius:999px;
    border:1px solid #2ab7ff;
    margin-bottom:0.5em;
    }
    .app-card svg {
    width:2.2em;
    height:auto;
    }
    .app-card svg path { fill:#2ab7ff; }
    .app-card--outline {
    background:transparent;
    border:2px dashed rgba(42,183,255,0.5);
    }
    .app-card--outline:hover {
    background:rgba(0,78,143,0.2);
    border-style:solid;
    }
    .apps {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:1em;
    margin-top:2em;
    min-width:0;
    }
    .apps .info-card {
    font-size:0.7em;
    font-weight:500;
    color:#2ab7ff;
    background:transparent;
    padding:0.25em 0.55em;
    border-radius:999px;
    margin-bottom:0.5em;
    border:1px solid #2ab7ff;
    display:inline-block;
    }
    .apps .single-card {
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    gap:0.5em;
    background:linear-gradient(145deg,#003366,#001a33);
    padding:1em;
    border-radius:12px;
    color:#2ab7ff;
    transition:all 0.3s ease;
    border:1px solid rgba(42,183,255,0.25);
    text-decoration:none;
    }
    .apps .single-card:hover {
    background:linear-gradient(145deg,#004080,#002244);
    transform:translateY(-2px);
    box-shadow:0 6px 16px rgba(42,183,255,0.25);
    border-color:rgba(42,183,255,0.5);
    }
    .apps .single-card svg { width:2.2em; }
    .apps .single-outline {
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    gap:0.5em;
    background:transparent;
    padding:1em;
    border-radius:8px;
    color:#2ab7ff;
    transition:all 0.3s ease;
    border:2px dashed rgba(42,183,255,0.5);
    text-decoration:none;
    }
    .apps .single-outline:hover {
    background:rgba(0,78,143,0.2);
    border-style:solid;
    transform:translateY(-2px);
    box-shadow:0 4px 12px rgba(42,183,255,0.2);
    }
    .apps .single-outline svg { width:2.2em; }
    .apps .single {
    display:grid;
    grid-template-columns:auto;
    justify-content:center;
    align-items:center;
    gap:1em;
    background:#00235e;
    padding:1em;
    border-radius:6px;
    color:#2ab7ff;
    transition:all 0.3s ease;
    }
    .apps .single:hover {
    background:#004e8f;
    transform:translateY(-2px);
    box-shadow:0 4px 12px rgba(42,183,255,0.3);
    }
    .apps .single svg {
    width:2.5em
    }

    .apps .single .title {
    font-size:1
    }
    main > p {
    color:rgba(255,255,255,0.8);
    margin:1em 0 0 0;
    font-size:.875em
    }
    iframe {
    border-radius:12px;
    margin-top:1em;
    padding:.25em;
    background:#fff;
    width:calc(100% - .5em);
    height:640px;
    transform:scale(1)
    }
    .svgs {
    position:fixed;
    width:100%;
    top:20%;
    right:0%;
    z-index:-1
    }
    .svgs svg {                
    opacity:.15;
    position:absolute;
    right:-50%;
    width:100%;
    }
    .svgs svg path {
    fill:#2ab7ff;
    }
    .ozelbg {
    position:fixed;
    left:0;
    top:-20%;
    z-index:-1;
   
    }
    .ozelbg svg {
    width:100%;
    opacity:.15
    }
    .ozelbg svg path {
    fill:#2ab7ff;
    }
    footer {
    margin-top:2em;
    text-align:center;
    color:rgba(255,255,255,0.5);
    font-size:0.8em;
    padding-bottom:1em;
    }

    .popup{
        background-color: #00235e;
        width: 420px;
        padding: 30px 40px;
        position: absolute;
        transform: translate(-50%,-50%);
        left: 50%;
        top: 50%;
        border-radius: 8px;
        font-family: "Lexend",sans-serif;
        display: none; 
        text-align: center;
        color:#ffffff;
        border:1px solid #2ab7ff;
    }
    @media screen and (max-width: 800px) {
        .popup{
            width: 250px;
            left: 50%;
            top: 50%;
        }
    }

    /* Mobil: kaymayı önle, geçişleri hızlandır, ekran boyutuna göre düzenle */
    @media screen and (max-width: 600px) {
        body {
            padding: 1em;
        }
        .choice-cards {
            grid-template-columns: 1fr 1fr;
            gap: 0.75em;
        }
        .choice-card {
            min-height: 110px;
            font-size: 0.95em;
            padding: 0.75em;
            transition: all 0.2s ease;
        }
        .apps--cards,
        .apps {
            grid-template-columns: 1fr 1fr;
            gap: 0.75em;
        }
        .app-card {
            padding: 1em 0.75em;
            transition: all 0.2s ease;
        }
    }
    @media screen and (max-width: 420px) {
        body {
            padding: 0.5em;
        }
        .choice-cards {
            grid-template-columns: 1fr 1fr;
            gap: 0.5em;
        }
        .choice-card {
            min-height: 80px;
            font-size: 0.8em;
            padding: 0.5em;
            aspect-ratio: 1;
        }
        .apps--cards,
        .apps {
            grid-template-columns: 1fr 1fr;
            gap: 0.5em;
        }
        .app-card {
            padding: 0.75em 0.5em;
            transition: all 0.18s ease;
        }
    }

    .popup button{
        display: block;
        margin:  0 0 20px auto;
        background-color: transparent;
        font-size: 30px;
        color: #ffffff;
        background: red;
        border-radius: 100%;
        width: 40px;
        height: 40px;
        border: none;
        outline: none;
        cursor: pointer;
    }
    .popup h2{
      margin-top: -20px;
    }
    .popup p{
        font-size: 14px;
        text-align: justify;
        margin: 20px 0;
        line-height: 25px;
    }