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

body {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
}

/* Main Container */
.container {
    width: 100%;
    padding: 20px;
}

/* Calculator Card */
.calculator {
    max-width: 620px;
    margin: auto;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 40px;
}

/* Heading */
.calculator h1 {
    font-size: 52px;
    line-height: 1.2;
    margin-bottom: 30px;
}

.calculator h1 span {
    color: #4fd1c5;
}

/* Input Box */
.input-box {
    display: flex;
    gap: 15px;
    background: rgba(255, 255, 255, 0.15);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
}

/* Date Input */
.input-box input {
    flex: 1;
    padding: 14px 16px;
    border-radius: 8px;
    border: none;
    outline: none;
    font-size: 16px;
}

/* Button */
.input-box button {
    padding: 14px 28px;
    border-radius: 8px;
    border: none;
    background: #4fd1c5;
    color: #083344;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: 0.3s ease;
}

.input-box button:hover {
    background: #38b2ac;
}

/* Result Text */
#result {
    font-size: 18px;
    line-height: 1.6;
}

#result span {
    color: #4fd1c5;
    font-weight: 600;
}

/* ============================= */
/* Mobile Responsiveness Fix */
/* ============================= */

@media (max-width: 768px) {

    body {
        align-items: flex-start;
    }

    .container {
        padding-top: 60px; /* FIXED top margin issue */
    }

    .calculator {
        padding: 25px;
    }

    .calculator h1 {
        font-size: 36px;
        text-align: center;
    }

    .input-box {
        flex-direction: column;
        gap: 12px;
    }

    .input-box button {
        width: 100%;
    }

    #result {
        text-align: center;
    }
}