/* =========================================================
   SECTION — Calculator (расчёт стоимости)
   Mobile (<900px): квиз из 4 шагов
   Desktop (≥900px): полная форма в 2 колонки
   ========================================================= */
.calculator {
	padding: var(--space-16) 0;
	background: var(--bg);
}
@media (min-width: 900px) {
	.calculator { padding: var(--space-24) 0; }
}

.calculator__head {
	max-width: 720px;
	margin-bottom: var(--space-10);
}
@media (min-width: 900px) {
	.calculator__head { margin-bottom: var(--space-12); }
}

.calculator__badge {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	padding: var(--space-2) var(--space-3);
	margin-bottom: var(--space-4);
	background: var(--color-brand-50);
	color: var(--action);
	font-size: var(--text-sm);
	font-weight: 600;
	border-radius: var(--radius-full);
}
.calculator__badge::before {
	content: '';
	width: 6px;
	height: 6px;
	background: var(--action);
	border-radius: 50%;
}

.calculator__heading {
	font-size: clamp(1.75rem, 2.5vw + 1rem, var(--text-4xl));
	font-weight: 700;
	letter-spacing: var(--tracking-snug);
	color: var(--text);
	margin-bottom: var(--space-3);
}

.calculator__subtitle {
	font-size: var(--text-lg);
	color: var(--text-muted);
	line-height: var(--leading-relaxed);
}

/* =========================================================
   PANEL
   Mobile: квиз — один шаг видимый, остальные display:none
   Desktop: все шаги видны, лейаут как форма
   ========================================================= */
.calculator__panel {
	position: relative;
	background: var(--bg);
	border: 1px solid var(--border);
	border-radius: var(--radius-xl);
	padding: var(--space-5);
}

/* =========================================================
   MOBILE — квиз
   ========================================================= */
@media (max-width: 899px) {
	.calculator__panel {
		display: flex;
		flex-direction: column;
		gap: var(--space-5);
	}

	/* Прогресс-точки */
	.calc-quiz-progress {
		display: flex;
		align-items: center;
		justify-content: center;
		gap: var(--space-2);
		margin-bottom: var(--space-2);
	}
	.calc-quiz-progress__dot {
		width: 28px;
		height: 4px;
		background: var(--color-neutral-200);
		border-radius: var(--radius-full);
		transition: background var(--transition-fast);
	}
	.calc-quiz-progress__dot.is-done   { background: var(--color-brand-300); }
	.calc-quiz-progress__dot.is-active { background: var(--action); }

	/* Один шаг видим */
	.calc-step {
		display: none;
		flex-direction: column;
		gap: var(--space-4);
		animation: calc-step-in 200ms ease-out;
	}
	.calc-step.is-active { display: flex; }

	@keyframes calc-step-in {
		from { opacity: 0; transform: translateX(20px); }
		to   { opacity: 1; transform: translateX(0); }
	}

	.calc-step__head {
		display: flex;
		align-items: center;
		gap: var(--space-3);
	}

	.calc-step__back {
		display: inline-flex;
		align-items: center;
		justify-content: center;
		width: 36px;
		height: 36px;
		background: var(--bg-subtle);
		border: 1px solid var(--border);
		border-radius: var(--radius-md);
		color: var(--text);
		cursor: pointer;
		flex-shrink: 0;
	}
	.calc-step__back svg { width: 18px; height: 18px; }
	.calc-step__back:hover { background: var(--bg-muted); }

	.calc-step__title {
		font-size: var(--text-xl);
		font-weight: 700;
		color: var(--text);
		letter-spacing: var(--tracking-snug);
		line-height: var(--leading-snug);
		margin: 0;
	}
	/* На первом шаге back-кнопки нет — title слева */
	.calc-step[data-step="1"] .calc-step__title {
		margin-bottom: var(--space-2);
	}

	/* Карточки выбора (тип / материал) */
	.calc-quiz-cards {
		display: grid;
		grid-template-columns: repeat(2, 1fr);
		gap: var(--space-3);
	}
	.calc-quiz-card {
		cursor: pointer;
		position: relative;
	}
	.calc-quiz-card input {
		position: absolute;
		opacity: 0;
		pointer-events: none;
	}
	.calc-quiz-card__visual {
		display: flex;
		align-items: center;
		justify-content: center;
		aspect-ratio: 1 / 1;
		background: var(--bg-subtle);
		border: 2px solid var(--border);
		border-radius: var(--radius-lg);
		overflow: hidden;
		transition: border-color var(--transition-fast), background var(--transition-fast);
	}
	.calc-quiz-card__visual--icon { color: var(--text-muted); }
	.calc-quiz-card__visual--icon svg { width: 48px; height: 48px; }
	.calc-quiz-card__visual--photo img {
		width: 100%;
		height: 100%;
		object-fit: cover;
		display: block;
	}
	.calc-quiz-card__title {
		display: block;
		margin-top: var(--space-2);
		font-size: var(--text-sm);
		font-weight: 600;
		color: var(--text);
		text-align: center;
		line-height: var(--leading-snug);
	}
	.calc-quiz-card input:checked + .calc-quiz-card__visual {
		border-color: var(--action);
		background: var(--color-brand-50);
		box-shadow: 0 0 0 4px rgba(78, 176, 97, 0.15);
	}
	.calc-quiz-card input:checked + .calc-quiz-card__visual--icon {
		color: var(--action);
	}
	.calc-quiz-card input:checked ~ .calc-quiz-card__title {
		color: var(--action);
	}
	.calc-quiz-card input:focus-visible + .calc-quiz-card__visual {
		box-shadow: 0 0 0 4px rgba(78, 176, 97, 0.3);
	}
}

/* =========================================================
   DESKTOP — полная форма
   ========================================================= */
@media (min-width: 900px) {
	.calculator__panel {
		display: grid;
		grid-template-columns: 1.3fr 1fr;
		grid-template-areas:
			"step1 step4"
			"step2 step4"
			"step3 step4";
		gap: var(--space-6) var(--space-10);
		padding: var(--space-10);
		align-items: start;
	}
	.calc-quiz-progress { display: none; }
	.calc-step[data-step="1"] { grid-area: step1; }
	.calc-step[data-step="2"] { grid-area: step2; }
	.calc-step[data-step="3"] { grid-area: step3; }
	.calc-step[data-step="4"] { grid-area: step4; }

	.calc-step__back   { display: none; }
	.calc-step__title  {
		font-size: var(--text-sm);
		font-weight: 600;
		color: var(--text);
		margin-bottom: var(--space-2);
		letter-spacing: var(--tracking-snug);
	}
	.calc-step__head {
		display: contents;
	}
	.calc-step__next {
		display: none;
	}

	.calc-step {
		display: flex;
		flex-direction: column;
		gap: var(--space-2);
	}

	/* На десктопе карточки маленькие — pills-like */
	.calc-quiz-cards {
		display: grid;
		grid-template-columns: repeat(4, 1fr);
		gap: var(--space-2);
	}
	/* Шаг «Тип навеса» — 3 карточки, делаем 3-кол чтобы не оставлять пустоту */
	.calc-step[data-step="1"] .calc-quiz-cards {
		grid-template-columns: repeat(3, 1fr);
		gap: var(--space-3);
	}
	.calc-quiz-card { cursor: pointer; position: relative; }
	.calc-quiz-card input {
		position: absolute; opacity: 0; pointer-events: none;
	}
	.calc-quiz-card__visual {
		display: flex;
		align-items: center;
		justify-content: center;
		min-height: 60px;
		background: var(--bg);
		border: 1.5px solid var(--border);
		border-radius: var(--radius-md);
		overflow: hidden;
		transition: border-color var(--transition-fast), background var(--transition-fast);
	}
	.calc-quiz-card__visual--icon { color: var(--text-muted); }
	.calc-quiz-card__visual--icon svg { width: 28px; height: 28px; }
	.calc-quiz-card__visual--photo {
		min-height: 0;
		aspect-ratio: 16 / 10;
	}
	.calc-quiz-card__visual--photo img {
		width: 100%; height: 100%; object-fit: cover; display: block;
	}
	.calc-quiz-card__title {
		display: block;
		margin-top: var(--space-1);
		font-size: var(--text-xs);
		font-weight: 600;
		color: var(--text);
		text-align: center;
		line-height: var(--leading-snug);
	}
	.calc-quiz-card input:checked + .calc-quiz-card__visual {
		border-color: var(--action);
		background: var(--color-brand-50);
	}
	.calc-quiz-card input:checked + .calc-quiz-card__visual--icon { color: var(--action); }
	.calc-quiz-card input:checked ~ .calc-quiz-card__title { color: var(--action); }
}

/* =========================================================
   ОБЩЕЕ — поля, контакты, дисплей, кнопка
   ========================================================= */
.calc-row {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: var(--space-3);
}

.calc-field {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
}

.calc-field__label {
	font-size: var(--text-sm);
	font-weight: 600;
	color: var(--text);
	letter-spacing: var(--tracking-snug);
}

.calc-field__control {
	height: 52px;
	padding: 0 var(--space-4);
	background: var(--bg);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	font-family: inherit;
	font-size: var(--text-base);
	font-weight: 600;
	color: var(--text);
	transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
	width: 100%;
}
.calc-field__control:focus {
	outline: none;
	border-color: var(--action);
	box-shadow: var(--shadow-focus);
}
.calc-field__control[type="number"] { -moz-appearance: textfield; }
.calc-field__control[type="number"]::-webkit-inner-spin-button,
.calc-field__control[type="number"]::-webkit-outer-spin-button {
	-webkit-appearance: none;
	margin: 0;
}

.calc-field__input-wrap { position: relative; }
.calc-field__suffix {
	position: absolute;
	right: var(--space-4);
	top: 50%;
	transform: translateY(-50%);
	font-size: var(--text-sm);
	color: var(--text-subtle);
	font-weight: 600;
	pointer-events: none;
}
.calc-field__input-wrap .calc-field__control { padding-right: var(--space-10); }

/* Display */
.calc-display {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
	padding: var(--space-5) var(--space-6);
	background: var(--bg-subtle);
	border-radius: var(--radius-lg);
}

.calc-display__label {
	font-size: var(--text-xs);
	font-weight: 700;
	letter-spacing: var(--tracking-wide);
	text-transform: uppercase;
	color: var(--text-subtle);
}

.calc-display__price {
	font-size: clamp(2rem, 4vw + 1rem, 3rem);
	font-weight: 800;
	color: var(--action);
	line-height: 1.05;
	letter-spacing: var(--tracking-tight);
}

/* Цена со скидкой (акция): новая крупно + старая зачёркнута + бейдж */
.calc-display__price.has-promo {
	display: flex;
	align-items: baseline;
	flex-wrap: wrap;
	gap: var(--space-1) var(--space-3);
}
.calc-price__new { color: var(--action); }
.calc-price__old {
	font-size: 0.46em;
	font-weight: 700;
	color: var(--text-subtle);
	text-decoration: line-through;
	text-decoration-color: #e23b3b;
	text-decoration-thickness: 2px;
}
.calc-price__badge {
	align-self: center;
	font-size: 0.4em;
	font-weight: 800;
	color: var(--text-on-brand);
	background: var(--action);
	padding: 0.25em 0.6em;
	border-radius: var(--radius-full);
	letter-spacing: 0;
}
.calc-display__promo-hint {
	font-size: var(--text-sm);
	font-weight: 600;
	color: var(--action);
}

.calc-display__note {
	font-size: var(--text-sm);
	color: var(--text-muted);
	line-height: var(--leading-relaxed);
	margin: 0;
}

.calc-display__meta {
	display: flex;
	gap: var(--space-5);
	padding-top: var(--space-4);
	border-top: 1px solid var(--border);
}
.calc-display__meta-item {
	display: flex;
	flex-direction: column;
	gap: 2px;
}
.calc-display__meta-label {
	font-size: var(--text-xs);
	color: var(--text-subtle);
	font-weight: 500;
}
.calc-display__meta-value {
	font-size: var(--text-base);
	font-weight: 700;
	color: var(--text);
}

/* Contacts */
.calc-contact {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: var(--space-3);
}
@media (max-width: 499px) {
	.calc-contact { grid-template-columns: 1fr; }
}

/* Submit + spinner */
[data-calc-submit] {
	position: relative;
}
.calc-submit__spinner {
	display: none;
	position: absolute;
	right: var(--space-4);
	top: 50%;
	transform: translateY(-50%);
	width: 16px;
	height: 16px;
	border: 2px solid rgba(255,255,255,0.4);
	border-top-color: #fff;
	border-radius: 50%;
	animation: sv-spin 0.7s linear infinite;
}
.is-loading .calc-submit__spinner { display: block; }
.is-loading .calc-submit__label   { opacity: 0.7; }

@keyframes sv-spin {
	to { transform: translateY(-50%) rotate(360deg); }
}

.calc-msg {
	font-size: var(--text-sm);
	font-weight: 600;
	line-height: var(--leading-snug);
	margin: 0;
}
.calc-msg:empty { display: none; }
.calc-msg[data-kind="error"]   { color: var(--error); }
.calc-msg[data-kind="success"] { color: var(--success); }

.calc-disclaimer {
	font-size: var(--text-xs);
	color: var(--text-subtle);
	line-height: var(--leading-relaxed);
	margin: 0;
}

.is-success .calc-display {
	background: var(--color-brand-50);
	border: 1px solid var(--color-brand-200);
}
.is-success .calc-display__price {
	color: var(--text);
}