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

body {
    background: #000000;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 2rem;
}

.container1 {
    background: #27272a;
    padding: 1rem;
    border-radius: 1rem;
    margin-top: 3%;
    font-size: larger;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 450px;   /* Keeps box size consistent */
    transition: all 0.3s ease;
}

.container2 {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    text-align: center;
    padding: 2rem;
    background: transparent;
}

#sipRateDisplay,
#sipYearsDisplay,
#lumpRateDisplay,
#lumpYearsDisplay,
#stepUpDisplay,
#stepSipRateDisplay,
#stepSipYearsDisplay {
    display: inline-block;
    width: 4ch;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.responsive-two-column-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
    margin-top: 2rem;
}

/* Responsive on small screens */
@media (max-width: 768px) {
    .responsive-two-column-grid {
        grid-template-columns: 1fr;
    }

    .result {
        margin-top: 1.5rem;
    }
}

@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    .container1,
    .result {
        padding: 1.5rem;
    }

    form input[type="number"] {
        font-size: 0.95rem;
    }

    form input[type="range"] {
        height: 4px;
    }

    button {
        font-size: 0.9rem;
    }
}

h1 {
    text-align: center;
    font-size: 50px;
    margin-bottom: 1.5rem;
    color: #fff;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

label {
    color: #fff;
    font-weight: 600;
    color: #fff;
}

.container1 input[type="number"],
.container1 input[type="range"] {
    width: 100%;
    box-sizing: border-box;
    border-radius: 0.5rem;
    border: 1px solid #555;
    font-size: 1rem;
    background: #1f1f1f;
    color: #fff;
}

input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type=number] {
    -moz-appearance: textfield;
}

.container1 input:focus {
    border-color: #21d7fb;
    outline: none;
}

button {
    background-image: linear-gradient(to right, #1A2980 0%, #2695d0  51%, #1A2980  100%);
    color: #fff;
    border: none;
    padding: 0.75rem;
    font-size: 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    text-decoration: none;
    transition: 0.5s;
    background-size: 200% auto;
}

button:hover {
    background-position: right center;
    text-decoration: none;
}

.result {
    margin-top: 3%;
    font-size: 1.3rem;
    font-weight: bold;
    color: #FFF;
    background: #1f1f1f;
    border-radius: 1rem;
    text-align: left;
    padding: 1rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    word-wrap: break-word;
}

.center {
    text-align: center;
}

.flex {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    border-bottom: 3px solid #21d7fb;
    padding-bottom: 1rem;
}

.card {
    background: transparent;
    color: #fff;
    padding: 1rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.card:hover {
    background: transparent;
    padding: 1rem;
    border: 2px solid #004999;
}

.btn-grad {
    background-image: linear-gradient(to right, #1A2980 0%, #2695d0  51%, #1A2980  100%)
}

.btn-grad {
    padding: 1rem;
    text-align: center;
    text-decoration: none;
    transition: 0.5s;
    background-size: 200% auto;
    color: white;
    border-radius: 10px;
    display: block;
    font-weight: 600;
}

.btn-grad:hover {
    background-position: right center;
    color: #fff;
    text-decoration: none;
}