* {
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #0f172a, #020617);
    color: white;
    margin: 0;
}

/* HEADER */
.header {
    text-align: center;
    padding: 20px;
}

.header h1 {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(90deg, #22c55e, #3b82f6);
    -webkit-background-clip: text;
    color: transparent;
}

/* GRID */
.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    padding: 15px;
}

.card {
    background: #1e293b;
    padding: 18px;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
}

.card:hover {
    background: #334155;
    transform: scale(1.05);
}

/* WORKSPACE */
.workspace {
    text-align: center;
    padding: 15px;
    max-width: 700px;
    margin: auto;
}

/* TOOL */
.tool {
    display: none;
}

.tool.active {
    display: block;
}

/* INPUT */
input {
    width: 90%;
    max-width: 400px;
    padding: 12px;
    margin: 10px auto;
    border-radius: 8px;
    border: none;
    display: block;
}

/* BUTTON */
.btn {
    padding: 12px 20px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    margin: 10px;
}

.green { background: #22c55e; }
.blue { background: #3b82f6; }
.orange { background: #f97316; }
.pink { background: #ec4899; }

/* PROGRESS */
.progress-box {
    width: 90%;
    max-width: 500px;
    height: 10px;
    background: #334155;
    border-radius: 10px;
    margin: 20px auto;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #22c55e, #3b82f6);
    transition: 0.3s;
}

#progressText {
    text-align: center;
    font-weight: 600;
    color: #22c55e;
}

/* MOBILE */
@media (max-width: 768px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .btn {
        width: 90%;
    }
}

@media (max-width: 480px) {
    .grid {
        grid-template-columns: 1fr;
    }
}