style.css

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f0f4f8;
    color: #333333;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 30px auto;
    padding: 30px;
    background-color: #ffffff;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border-radius: 15px;
    overflow: hidden;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: #4a90e2;
    font-size: 36px;
    margin-bottom: 10px;
    font-weight: 700;
}

header p {
    color: #7f8c8d;
    font-size: 18px;
    line-height: 1.6;
}

form {
    margin-bottom: 30px;
    display: grid;
    gap: 20px;
}

label {
    color: #2c3e50;
    font-size: 16px;
    font-weight: 500;
}

input, select, button {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    outline: none;
    transition: all 0.3s ease-in-out;
}

input:focus, select:focus {
    border-color: #4a90e2;
}

button {
    background-color: #4a90e2;
    color: white;
    cursor: pointer;
    font-weight: 600;
}

button:hover {
    background-color: #357ab7;
}

button:active {
    transform: translateY(2px);
}

.hidden {
    display: none;
}

#exercise-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.exercise-card {
    padding: 20px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.exercise-card:hover {
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.15);
    transform: translateY(-5px);
}

.progress-bar {
    height: 12px;
    background: #ddd;
    border-radius: 5px;
    margin-top: 15px;
}

#progress-fill {
    height: 100%;
    width: 0;
    background: #4a90e2;
    border-radius: 5px;
}