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

body {
    background: #080b12;
    color: white;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ========================= */
/*       FOND ANIMÉ          */
/* ========================= */

.background {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top right, #2563eb55, transparent 35%),
        radial-gradient(circle at bottom left, #7c3aed33, transparent 30%);
    z-index: -1;
}

/* ========================= */
/*         HEADER            */
/* ========================= */

header {
    width: 100%;
    padding: 25px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 35px;
    font-weight: 900;
    color: #4da3ff;
}

nav a {
    color: #bbb;
    text-decoration: none;
    margin: 0 15px;
    transition: .3s;
}

nav a:hover {
    color: white;
}

/* ========================= */
/*         BOUTONS           */
/* ========================= */

.btn {
    background: #357cff;
    padding: 13px 28px;
    border-radius: 30px;
    color: white;
    text-decoration: none;
    transition: .3s;
}

.btn:hover {
    box-shadow: 0 0 30px #357cff;
    transform: translateY(-3px);
}

.secondary {
    margin-left: 15px;
    background: #151b2b;
}

/* ========================= */
/*          HERO             */
/* ========================= */

.hero {
    min-height: 75vh;
    display: flex;
    align-items: center;
    padding: 0 10%;
}

.badge {
    color: #60a5fa;
    letter-spacing: 4px;
}

h1 {
    font-size: 75px;
    margin: 20px 0;
}

h1 span {
    color: #4da3ff;
}

.description {
    max-width: 650px;
    color: #aab4c5;
    font-size: 20px;
    line-height: 1.6;
}

.buttons {
    margin-top: 35px;
}

/* ========================= */
/*         STATS             */
/* ========================= */

.stats {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
}

.stat-card,
.card {
    background: #111827cc;
    border: 1px solid #ffffff15;
    border-radius: 20px;
    padding: 30px;
    backdrop-filter: blur(10px);
}

.stat-card {
    width: 230px;
    text-align: center;
}

.stat-card h2 {
    color: #60a5fa;
    font-size: 40px;
}

/* ========================= */
/*       FEATURES            */
/* ========================= */

.features {
    padding: 80px 8%;
}

.features h2 {
    text-align: center;
    font-size: 40px;
    margin-bottom: 40px;
}

.cards {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
}

.card {
    width: 280px;
    transition: .3s;
}

.card:hover {
    transform: translateY(-10px);
    border-color: #3b82f6;
    box-shadow: 0 0 30px rgba(59,130,246,.25);
}

/* ========================= */
/*         FOOTER            */
/* ========================= */

footer {
    text-align: center;
    padding: 50px;
    color: #888;
}

/* ========================= */
/*         MOBILE            */
/* ========================= */

@media(max-width:700px){

    header{
        flex-direction:column;
        gap:20px;
    }

    h1{
        font-size:45px;
    }

    nav{
        display:none;
    }

}

/* ========================= */
/*         PAGE 404          */
/* ========================= */

.page{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    padding:40px;
    position:relative;
    z-index:1;
}

.main{

    width:100%;
    max-width:700px;

    text-align:center;

    padding:60px;

    background:rgba(17,24,39,.75);

    backdrop-filter:blur(20px);

    border:1px solid rgba(255,255,255,.08);

    border-radius:25px;

    box-shadow:
        0 0 60px rgba(59,130,246,.15);

    animation:fadeUp .8s ease;

}

.main h1{

    color:#60a5fa;

    font-size:30px;

    margin-bottom:10px;

}

.error-code{

    font-size:130px;

    font-weight:900;

    color:#3b82f6;

    line-height:1;

    text-shadow:
        0 0 40px rgba(59,130,246,.4);

}

.main h2{

    margin:20px 0;

    font-size:40px;

}

.lead{

    color:#aab4c5;

    font-size:18px;

    line-height:1.7;

}

.main hr{

    width:80%;

    margin:35px auto;

    border:none;

    border-top:1px solid rgba(255,255,255,.08);

}

.help-actions{

    display:flex;

    justify-content:center;

    flex-wrap:wrap;

    gap:15px;

    margin-top:30px;

}

.help-actions a{

    background:#357cff;

    color:white;

    text-decoration:none;

    padding:14px 28px;

    border-radius:30px;

    transition:.3s;

}

.help-actions a:hover{

    background:#4d9bff;

    transform:translateY(-5px) scale(1.03);

    box-shadow:
        0 0 35px rgba(77,155,255,.6);

}

@keyframes fadeUp{

    from{

        opacity:0;

        transform:translateY(40px);

    }

    to{

        opacity:1;

        transform:translateY(0);

    }

}