.contact-form {
	/* -- color variables -- */
	--contact-color-bg: var(--color-background-primary);
	--contact-color-input-bg: var(--color-input-background);
	--contact-color-input-border: var(--color-input-border);
	--contact-color-checkbox-bg: var(--color-neutral-white);
	--contact-color-placeholder: #999;
	--contact-color-divider: #e0e0e0;

	display: flex;
	flex-direction: column;
	gap: 2rem;
	padding: 4rem 2rem;
	max-width: 900px;
	background-color: var(--contact-color-bg);
	box-shadow: 0 0 8px rgba(0, 0, 0, 0.15);
}

.contact-form-item {
	display: grid;
	grid-template-columns: 1fr;
	gap: 0.5rem;
	width: 100%;
}

.contact-form-item-field {
	font-weight: bold;
}

.contact-form-item-input,
.contact-form-item-textarea {
	width: 100%;
	border: none;
	border-radius: 6px;
	padding: 0.5em;
	background-color: var(--contact-color-input-bg);
}

.contact-form-item-textarea {
	resize: vertical;
}

.contact-form-item-input::placeholder,
.contact-form-item-textarea::placeholder {
	color: var(--contact-color-placeholder);
}

.contact-form-control {
	display: grid;
	place-content: center;
}

.contact-form-required {
	margin-left: 1em;
	display: inline-block;
	color: var(--color-neutral-white);
	background-color: var(--color-primary);
	padding: 6px;
	font-size: 12px;
	line-height: 1;
	border-radius: 6px;
}

.contact-form-subtitle {
	font-weight: bold;
	font-size: 1.1rem;
	text-decoration: underline var(--color-primary) 2px;
	text-underline-offset: 4px;
}

.checkbox-item {
	display: flex;
	align-items: center;
	position: relative;
	cursor: pointer;
}

.checkbox-item input[type="checkbox"] {
	display: none;
}

.checkbox-item label {
	display: flex;
	align-items: center;
	cursor: pointer;
}

.checkbox-item label::before {
	content: '';
	flex-shrink: 0;
	width: 18px;
	height: 18px;
	border: 2px solid var(--contact-color-input-border);
	border-radius: 3px;
	margin-right: 8px;
	background-color: var(--contact-color-checkbox-bg);
	transition: background-color 0.2s, border-color 0.2s;
}

.checkbox-item input[type="checkbox"]:checked + label::before {
	background-color: var(--color-primary);
	border-color: var(--color-primary);
}

.checkbox-item label::after {
	content: '';
	position: absolute;
	top: 50%;
	left: 7px;
	width: 5px;
	height: 10px;
	border-bottom: 3px solid var(--color-neutral-white, #fff);
	border-right: 3px solid var(--color-neutral-white, #fff);
	transform: translateY(-60%) rotate(45deg);
	opacity: 0;
	transition: opacity 0.2s;
}

.checkbox-item input[type="checkbox"]:checked + label::after {
	opacity: 1;
}

/* -- 郵便番号 + 住所検索ボタン -- */

.contact-postal-code-row {
	display: flex;
	gap: 0.5rem;
	align-items: center;
}

.contact-postal-code-row .contact-form-item-input {
	flex: 1;
}

.contact-search-address-btn {
	flex-shrink: 0;
	padding: 0.5em 1em;
	border: 2px solid var(--color-primary);
	border-radius: 6px;
	background-color: var(--color-neutral-white);
	color: var(--color-primary);
	font-weight: bold;
	font-size: 0.875rem;
	cursor: pointer;
	white-space: nowrap;
	transition: background-color 0.2s, color 0.2s;
}

.contact-search-address-btn:hover {
	background-color: var(--color-primary);
	color: var(--color-neutral-white);
}

.contact-search-address-btn:focus-visible {
	background-color: var(--color-primary);
	color: var(--color-neutral-white);
	outline: 2px solid var(--color-primary);
	outline-offset: 2px;
}

.contact-search-address-btn:active {
	opacity: 0.8;
}

/* -- バリデーションエラー -- */

.contact-form-item-input:user-invalid,
.contact-form-item-textarea:user-invalid,
select:user-invalid {
	border: 1px solid #c00;
}

@media screen and (min-width: 768px) {
	.contact-form-item {
		grid-template-columns: 200px 1fr;
		align-items: start;
		gap: 0 1rem;
	}

	.contact-form-divider {
		padding-top: 1.5rem;
		border-top: 1px solid var(--contact-color-divider);
	}

	.contact-form-item-field {
		padding-top: 0.5em;
		display: flex;
		justify-content: space-between;
		align-items: baseline;
	}
}

/* -- confirm -- */

.contact-confirm {
	display: flex;
	flex-direction: column;
	padding: 2em;
	background-color: #fff;
	box-shadow: 0 0 8px gray;
}

.contact-confirm-item {
	padding: 0.5em;
	display: flex;
	flex-direction: column;
	gap: 0.2em;
	border-bottom: 1px dashed var(--color-input-border);
}

.contact-confirm-item-field {
	color: var(--color-primary);
	font-weight: bold;
}

.contact-confirm-item-value {
	min-height: 1.5em;
}

.contact-confirm-note {
	margin: 2em 0;
	padding: 0 1em;
}

.contact-confirm-button {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 1em;
}

/* -- thanks -- */

.contact-thanks {
	display: flex;
	flex-direction: column;
	gap: 1em;
	padding: 2em;
	background-color: #fff;
	box-shadow: 0 0 8px gray;
}