:root {
    /* Colors */
    --color-grey-87: #dbdedf;
    --color-grey-13: #231f20;
    --color-grey-96: #f4f4f4;
    --color-bg-light: #f6f8f3;
    --color-btn-border: #6b6b6b;
    --color-btn-shadow: #97aef3;
    --color-white: #fff;
    --color-error: #d32f2f;

    /* Spacing */
    --space-xxs: 0.25rem; /* 4px */
    --space-xs: 0.5rem; /* 8px */
    --space-sm: 1rem; /* 16px */
    --space-md: 1.5rem; /* 24px */
    --space-lg: 2rem; /* 32px */

    /* Borders & Radius */
    --radius-sm: 0.25rem; /* 4px */

    /* Shadows */
    --shadow-inset: 0 1px 2px 1px rgba(35, 31, 32, 0.1) inset;
    --shadow-btn: 0 0 12px -2px var(--color-btn-shadow);

    /* Fonts */
    --font-sm: 0.75rem; /* 12px */
    --font-md: 1rem; /* 16px */
    --font-lg: 1.25rem; /* 20px */
    --line-md: 1.25rem;
}

body {
    font-family: "Source Sans Pro", sans-serif;
}

.payment-form {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    border: 1px solid var(--color-grey-87);
}

.form-group {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    align-self: stretch;
    margin-top: var(--space-lg);
}

legend,
.form-group .form-section label,
.form-helper {
    color: var(--color-grey-13);
}

legend {
    font-size: var(--font-md);
    font-weight: 700;
    letter-spacing: 0.05rem;
    line-height: var(--line-md);
    text-transform: uppercase;
}

.clear-fix {
    margin: 0;
    padding: 0;
    width: 100%;
    font-size: inherit;
    line-height: inherit;
}

.underline {
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-grey-87);
}

.amount-input-wrapper {
    position: relative;
    width: 100%;
}

.amount-input-wrapper::before {
    content: "$ CAD";
    position: absolute;
    top: 50%;
    left: 0.125rem;
    transform: translateY(-50%);
    padding: 0.375rem;
    color: var(--color-grey-13);
    font-size: var(--font-md);
    font-weight: 700;
    background: var(--color-grey-96);
    border-top-left-radius: var(--radius-sm);
    border-bottom-left-radius: var(--radius-sm);
}

.form-group .form-section .amount-input-wrapper input {
    padding-left: 3.75rem;
}

.form-group .form-section {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    flex: 1 0 0;
    padding: 0 var(--space-sm) var(--space-sm) 0;
}

.form-group .form-section label {
    font-size: var(--font-md);
    font-weight: 600;
    line-height: var(--line-md);
    padding-bottom: var(--space-xxs);
}

.form-group .form-section .error {
    color: var(--color-error);
    font-size: 0.85rem;
    font-weight: 400;
}

.form-group .form-section input,
#card-number,
#card-cvv,
#card-expiry {
    display: block;
    width: 100%;
    height: 2.1875rem;
    padding: var(--space-xs);
    border: 1px solid var(--color-grey-13);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    box-shadow: var(--shadow-inset);
    box-sizing: border-box;
    font: inherit;
    appearance: none;
    transition: box-shadow 0.5s, border-color 0.25s ease-in-out;
}

.form-group .form-section input.f3-form-error,
#card-number.f3-form-error,
#card-cvv.f3-form-error,
#card-expiry.f3-form-error {
    border-color: var(--color-error);
}

.form-helper {
    font-size: var(--font-sm);
    font-weight: 600;
    line-height: var(--line-md);
}

.container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
    width: 100%;
    padding: var(--space-md) var(--space-md) var(--space-lg);
    border-radius: var(--radius-sm);
    background: var(--color-bg-light);
}

.card-info-wrapper {
    display: flex;
    justify-content: space-between;
}

.card-info-wrapper > div {
    width: 50%;
    box-sizing: border-box;
}

.card-info {
    display: flex;
    flex-direction: row;
    gap: 1.25rem;
}

.card-info > div {
    padding-bottom: var(--space-sm);
}

.card-logo {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-end;
    padding: 0 var(--space-sm) var(--space-sm) 0;
}

.card-logo > span {
    margin-right: 1.125rem;
}

.card-brand {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: var(--space-xxs);
    align-self: stretch;
    padding: var(--space-sm) var(--space-sm) 0 1.875rem;
}

#card-number {
    padding-right: 3.75rem;
    background-image: none;
    background-origin: content-box;
    background-position: calc(100% + 2.5rem) center;
    background-repeat: no-repeat;
    background-size: contain;
}

.payment-form .btn {
    display: flex;
    justify-content: center;
    align-items: center;
    align-self: stretch;
    padding: var(--space-sm) 1.625rem;
    border: 1px solid var(--color-btn-border);
    border-radius: var(--radius-sm);
    background-color: var(--color-white);
    box-shadow: var(--shadow-btn);
    color: var(--color-btn-border);
    font-size: var(--font-lg);
    font-weight: 600;
    line-height: var(--line-md);
    text-align: center;
}

.payment-form .btn img {
    padding: 0 var(--space-xs);
}

.payment-form .btn:hover,
.payment-form .btn:active {
    background-color: var(--color-grey-87);
    color: var(--color-btn-border);
}

/* Media queries */
@media (max-width: 37.5rem) {
    .form-group {
        flex-direction: column;
        margin-top: var(--space-sm);
    }
    .form-group .form-section {
        padding-right: var(--space-xs);
    }
    .card-info-wrapper {
        flex-direction: column;
    }
    .card-info-wrapper > div {
        width: 100%;
        gap: 0;
    }
}

/* Table */

.payment-comment {
  margin: 1.5rem 0;
}

.payment-summary {
    padding: 24px;
    border: 1px solid var(--color-grey-87);
    display: grid;
    grid-template-columns: 1fr 2fr;
    max-width: 600px;
}

.payment-summary dt {
    font-weight: bold;
    white-space: nowrap;
    padding: 0.5rem 1rem 0.5rem 0;
    border-top: 1px solid var(--color-grey-87);
}

.payment-summary dd {
    margin: 0;
    padding: 0.5rem 0 0.5rem 1rem;
    border-top: 1px solid var(--color-grey-87);
}

.payment-summary dt:first-of-type,
.payment-summary dd:first-of-type,
.payment-summary dt:nth-of-type(2),
.payment-summary dd:nth-of-type(2) {
    border-top: none;
    text-transform: uppercase;
}

@media (max-width: 600px) {
    .payment-summary {
        grid-template-columns: 1fr;
    }
    .payment-summary dt {
        text-align: left;
        padding: 0.75rem 0 0.25rem;
    }
    .payment-summary dd {
        padding: 0.25rem 0 0.75rem;
    }
}