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

/*custom variables*/
:root{
    --primary: #3b82f6;
    --success: #10b981;
    --mindful: #8b5cf6;
    --danger: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f3f4f6;
    --bg-dark: #1f2937;
    --input-bg: #fff;
    --input-border: #d1d5db;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --font-family:'Inter',system-ui ,-apple-system ,sans-serif;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
    z-index: 1000;
    background-color: var(--text-primary);
    color: var(--input-bg);
    font-weight: bold;
    padding: 0.6rem 1rem;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.skip-link:focus {
    position: absolute;
    left: 1rem;
    top: 1rem;
    width: auto;
    height: auto;
    clip: auto;
    overflow: visible;
}


body{
    background-color: var(--input-bg);
}

header {
    background-color: var(--success);
    color: var(--input-bg);
    text-align: center;
    padding: 0.6rem 0;
}

header h1{
    font-size: clamp(0.75rem, 2vw, 1rem);
}

main {
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

#add-expense{
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

#add-expense h2{
    font-size: 0.9rem;
    color: var(--primary);
    padding: 0.4rem 0;
}

#table-caption{
    color: var(--mindful);
}

form {
    display: grid;
    grid-template-columns:repeat(2,1fr);
    gap: 0.6rem;
    font-size: 0.75rem;
}
@media (min-width:600px){
    #expense-form{
        font-size: 1rem;
        font-weight: 400;
    }

    input{
        font-size: 1rem;
    }

    body{
        font-size: 1rem;
    }
    #add-expense{
        max-width: 800px;
        margin: 0 auto;
        font-size: 1rem;
    }
}

form label{
    display: flex;
    align-items: center;
    color: var(--mindful);
    font-weight: 600;
    padding-left: 0.5rem;
}

form input,form select ,form button {
    padding: 0.5rem;
    font-size: 0.75rem;
    border-radius: 5px;
    border: 1px solid ;
}

form button{
    color: var(--input-bg);
    font-weight: 600;
    background-color: var(--success);
}

form input:hover,form select:hover{
    box-shadow: 0 4px 8px #333;
}

#expense-list{
    width: 92vw;
    font-size: 0.5rem;
}

#expense-list h2{
    color: var(--bg-dark);
}

@media (min-width:600px){
    #expense-list{
        max-width: 800px;
        margin: 0 auto;
        font-size: 1rem;
        font-weight: 400;
    }
    table button{
        font-size: 1rem;
    }
    
    table .btn{
        width: auto;
        padding: 0.4rem;
    }

    #summary p{
        max-width: 800px;
        margin: 0 auto;
    }
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table th , table td {
    border: 1px solid #ccc;
    padding: 0.5rem;
    text-align: center;
}

table td{
    color: var(--primary);
    font-weight: 600;
}

table th {
    background-color: var(--text-primary);
    color: var(--input-bg);
}

button {
    background-color: #4caf50;
    color: #fff;
    border: none;
    cursor: pointer;
    border-radius: 0.5rem;
}

button:hover {
    background-color: #4caf50;
    font-weight: bold;
    box-shadow: 0 4px 8px #333;
}

#summary p{
    margin-top: 1rem;
    font-weight: bold;
    font-size: 0.9rem;
    color: var(--success);
    position: sticky;
}

table button{
    height: 20px;
    width: 50px;
}

table .btn{
    width: auto;
    padding: 0.2rem;
    background: none;
    color: var(--success);
}

#delete-btn{
    color: var(--danger);
}

footer{
    background-color: var(--success);
    color: var(--bg-light);
    padding: 0.4rem;
    font-size: 0.75rem;
    text-align: center;
    position: fixed; bottom: 0;left: 0; right: 0;
}