* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: black;
    font-weight: 300;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    padding: 20px;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 xml:space=%27preserve%27 fill=%27%23111111%27 viewBox=%270 0 1440 1513%27%3E%3Cpath d=%27M1055.8 635.9s-.2-.4-.4-.4-.4.2-.4.4c-11 134-128.1 242.9-263.6 241.4H352.7A353 353 0 0 0 0 1230.3v282.3s.2.4.4.4.4-.2.4-.4c11-134 128.1-242.9 263.6-241.4H703c194.8 0 352.7-158 352.7-352.9V635.9z%27/%3E%3Cpath d=%27M2110.7-240.6s-.2-.4-.4-.4-.4.2-.4.4c-11 134-128.1 242.9-263.6 241.4h-438.6A352.8 352.8 0 0 0 1055 353.7V636s.2.4.4.4.4-.2.4-.4c11-134 128.1-242.9 263.6-241.4H1758c194.8 0 352.7-158 352.7-352.9v-282.3z%27/%3E%3Cpath d=%27M2211 252s-.2-.4-.4-.4-.4.2-.4.4c-11 134-128.1 242.9-263.6 241.4H1508a352.8 352.8 0 0 0-352.7 352.9v282.3s.2.4.4.4.4-.2.4-.4c11-134 128.1-242.9 263.6-241.4h438.6c194.8 0 352.7-158 352.7-352.9V252z%27/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    color: white;
    text-align: center;
    margin: 30px 0 30px 0;
    text-transform: uppercase;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.challenge-card {
    background: #262626;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s;
}

.challenge-card:hover {
    transform: translateY(-5px);
}

.challenge-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: white;
    margin-bottom: 20px;
}

.challenge-desc {
    color: white;
    margin-bottom: 20px;
    line-height: 1.4;
}

.challenge-btn {
    display: inline-block;
    background: rgb(255 0 150);
    color: rgb(247 247 247);
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 25px;
}

.challenge-btn:hover {
    background: white;
    color: black;
}

.difficulty {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: bold;
    margin-bottom: 10px;
}

.easy {
    background: #4ade80;
    color: white;
}

.medium {
    background: #fbbf24;
    color: white;
}