:root {
    --font-family: 'Inter', sans-serif;
    --color-bg: #f5f5f7;
    --color-surface: #ffffff;
    --color-text: #1d1d1f;
    --color-muted: #6e6e73;
    --color-border: #d8d8de;
    --color-primary: #222222;
    --color-primary-hover: #111111;
    --color-secondary-bg: transparent;
    --color-accent: #d9c7b3;
    --color-dark: #161616;
    --color-success: #117a37;
    --color-error: #bf2f39;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-card: 0 18px 50px rgba(17, 17, 17, 0.08);
    --container-width: 1200px;
    --container-padding: 0 20px;
    --gap-xs: 8px;
    --gap-sm: 12px;
    --gap-md: 20px;
    --gap-lg: 24px;
    --gap-xl: 32px;
    --gap-2xl: 48px;
    --header-height: 92px;
    --transition: 0.25s ease;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input {
    font: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

p,
h1,
h2,
h3 {
    margin: 0;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: 96px 0;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: var(--gap-lg);
    margin-bottom: var(--gap-2xl);
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--gap-xs);
    margin-bottom: var(--gap-sm);
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.85);
    color: var(--color-muted);
    font-size: 14px;
    font-weight: 500;
}

.section-badge--light {
    background: rgba(255, 255, 255, 0.18);
    color: #ffffff;
}

.section-title,
.hero__title,
.download__title,
.cta-banner__title {
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.section-title {
    max-width: 720px;
    font-size: clamp(32px, 4vw, 48px);
}

.section-link {
    color: var(--color-primary);
    font-weight: 500;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 52px;
    padding: 0 24px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 500;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.button:hover {
    transform: translateY(-1px);
}

.button--primary {
    background: var(--color-primary);
    color: #ffffff;
}

.button--primary:hover {
    background: var(--color-primary-hover);
}

.button--secondary {
    border-color: var(--color-primary);
    background: var(--color-secondary-bg);
    color: var(--color-primary);
}

.button--light {
    background: #ffffff;
    color: var(--color-primary);
}

.icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    background: var(--color-surface);
    transition: border-color var(--transition), transform var(--transition);
}

.icon-button:hover {
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    background: rgba(245, 245, 247, 0.88);
    border-bottom: 1px solid rgba(216, 216, 222, 0.7);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-lg);
    min-height: var(--header-height);
}

.header__logo,
.footer__logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
}

.header__logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #ffffff;
    font-size: 16px;
}

.header__nav {
    flex: 1;
}

.header__menu {
    display: flex;
    justify-content: center;
    gap: var(--gap-lg);
}

.header__menu-link,
.header__phone,
.footer__link {
    color: var(--color-muted);
    transition: color var(--transition);
}

.header__menu-link:hover,
.header__phone:hover,
.footer__link:hover,
.section-link:hover {
    color: var(--color-primary);
}

.header__actions {
    display: flex;
    align-items: center;
    gap: var(--gap-md);
}

.header__phone {
    white-space: nowrap;
    font-weight: 500;
}

.header__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}

.header__burger-line {
    width: 24px;
    height: 2px;
    border-radius: 999px;
    background: var(--color-primary);
    transition: transform var(--transition), opacity var(--transition);
}

.hero {
    position: relative;
    min-height: calc(100vh - var(--header-height));
    padding: 48px 0 96px;
    background:
        linear-gradient(90deg, rgba(14, 14, 16, 0.6) 0%, rgba(14, 14, 16, 0.18) 55%, rgba(14, 14, 16, 0.12) 100%),
        url('1.jpg') center/cover no-repeat;
}

.hero__container {
    display: flex;
    align-items: center;
    min-height: calc(100vh - var(--header-height) - 144px);
}

.hero__content {
    max-width: 620px;
    padding: 40px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.24);
    backdrop-filter: blur(18px);
    color: #ffffff;
}

.hero__title {
    font-size: clamp(40px, 6vw, 68px);
    margin-bottom: var(--gap-md);
}

.hero__text {
    max-width: 560px;
    margin-bottom: var(--gap-xl);
    color: rgba(255, 255, 255, 0.86);
    font-size: 18px;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap-md);
    margin-bottom: 36px;
}

.hero__stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gap-md);
}

.hero__stat {
    padding: 18px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
}

.hero__stat-value {
    display: block;
    margin-bottom: 6px;
    font-size: 24px;
}

.hero__stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}

.catalog__grid,
.reviews__grid,
.videos__grid,
.options__grid {
    display: grid;
    gap: var(--gap-lg);
}

.catalog__grid {
    grid-template-columns: repeat(2, minmax(0, calc((100% - var(--gap-lg)) / 2)));
}

.catalog-card,
.review-card,
.video-card,
.option-card,
.advantages__model-card,
.facade-config__preview,
.consultation__form {
    overflow: hidden;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
}

.catalog-card {
    display: flex;
    flex-direction: column;
}

.catalog-card__image,
.option-card__image,
.review-card__photo,
.video-card__image,
.facade-config__image,
.advantages__model-image {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.catalog-card__image {
    aspect-ratio: 16 / 10;
}

.catalog-card__body,
.option-card__body {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 12px;
    padding: 24px;
}

.catalog-card__title,
.review-card__name,
.video-card__title,
.option-card__title,
.advantages__item-title,
.footer__title {
    font-size: 22px;
    font-weight: 700;
}

.catalog-card__price {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-primary);
}

.catalog-card__text,
.advantages__item-text,
.review-card__text,
.option-card__text,
.footer__text,
.consultation__text,
.facade-config__description,
.facade-config__current {
    color: var(--color-muted);
}

.catalog-card__actions {
    display: flex;
    gap: var(--gap-sm);
    margin-top: auto;
}

.advantages__container,
.facade-config__container,
.consultation__container,
.download__container,
.footer__container {
    display: grid;
    gap: var(--gap-2xl);
}

.advantages__container,
.facade-config__container,
.consultation__container {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
}

.advantages__list {
    display: grid;
    gap: var(--gap-lg);
    margin-top: var(--gap-xl);
}

.advantages__item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.advantages__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(34, 34, 34, 0.08);
    color: var(--color-primary);
    font-weight: 700;
}

.advantages__model-card {
    position: relative;
    padding: 18px;
}

.advantages__model-badge {
    position: absolute;
    top: 30px;
    left: 30px;
    z-index: 1;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    font-weight: 500;
}

.advantages__model-image {
    border-radius: calc(var(--radius-md) - 6px);
    aspect-ratio: 4 / 3;
}

.cta-banner {
    padding: 0 0 96px;
}

.cta-banner__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-lg);
    padding-top: 36px;
    padding-bottom: 36px;
    border-radius: var(--radius-md);
    background: var(--color-dark);
    color: #ffffff;
}

.cta-banner__label {
    margin-bottom: 10px;
    color: rgba(255, 255, 255, 0.68);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.cta-banner__title {
    max-width: 760px;
    font-size: clamp(28px, 3vw, 40px);
}

.reviews__grid {
    grid-template-columns: repeat(4, minmax(0, calc((100% - 3 * var(--gap-lg)) / 4)));
}

.review-card {
    padding: 18px;
}

.review-card__photo {
    aspect-ratio: 1 / 1;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
}

.review-card__name {
    margin-bottom: 10px;
    font-size: 20px;
}

.gallery__masonry {
    column-count: 4;
    column-gap: var(--gap-lg);
}

.gallery__item {
    margin: 0 0 var(--gap-lg);
    break-inside: avoid;
}

.gallery__image {
    width: 100%;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-card);
}

.videos__grid {
    grid-template-columns: repeat(3, minmax(0, calc((100% - 2 * var(--gap-lg)) / 3)));
}

.video-card {
    overflow: hidden;
}

.video-card__preview {
    position: relative;
}

.video-card__image {
    aspect-ratio: 16 / 10;
}

.video-card__play {
    position: absolute;
    top: 50%;
    left: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 68px;
    height: 68px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.88);
    color: var(--color-primary);
    font-size: 24px;
    transform: translate(-50%, -50%);
}

.video-card__title {
    padding: 24px;
    font-size: 24px;
}

.facade-config__swatches {
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap-sm);
    margin: var(--gap-xl) 0 20px;
}

.facade-config__swatch {
    min-width: 130px;
    min-height: 52px;
    padding: 0 18px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition), background-color var(--transition), color var(--transition);
}

.facade-config__swatch--active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: #ffffff;
}

.facade-config__preview {
    position: relative;
    isolation: isolate;
}

.facade-config__image {
    aspect-ratio: 16 / 11;
}

.facade-config__overlay {
    position: absolute;
    inset: 0;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(34, 34, 34, 0.12) 100%), var(--facade-color);
    mix-blend-mode: multiply;
    opacity: 0.38;
    pointer-events: none;
}

.options__tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap-sm);
    margin-bottom: var(--gap-xl);
}

.options__tab {
    min-height: 48px;
    padding: 0 20px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface);
    color: var(--color-muted);
    transition: border-color var(--transition), color var(--transition), background-color var(--transition);
}

.options__tab--active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: #ffffff;
}

.options__grid {
    grid-template-columns: repeat(3, minmax(0, calc((100% - 2 * var(--gap-lg)) / 3)));
}

.option-card {
    transition: transform var(--transition), opacity var(--transition);
}

.option-card.is-hidden {
    display: none;
}

.consultation {
    background: #ececef;
}

.consultation__form {
    display: grid;
    gap: 18px;
    padding: 28px;
}

.form-field {
    display: grid;
    gap: 8px;
}

.form-field__label {
    font-weight: 500;
}

.form-field__input {
    min-height: 54px;
    padding: 0 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #ffffff;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-field__input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(34, 34, 34, 0.08);
}

.checkbox {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--color-muted);
}

.checkbox__input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.checkbox__box {
    position: relative;
    top: 2px;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: #ffffff;
}

.checkbox__input:checked + .checkbox__box {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.checkbox__input:checked + .checkbox__box::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    color: #ffffff;
    font-size: 12px;
    transform: translate(-50%, -50%);
}

.consultation__message {
    min-height: 24px;
    font-size: 14px;
    font-weight: 500;
}

.consultation__message.is-success {
    color: var(--color-success);
}

.consultation__message.is-error {
    color: var(--color-error);
}

.download {
    padding: 96px 0;
}

.download__container {
    align-items: stretch;
    padding-top: 96px;
    padding-bottom: 96px;
    border-radius: var(--radius-lg);
    background:
        linear-gradient(90deg, rgba(17, 17, 17, 0.68) 0%, rgba(17, 17, 17, 0.4) 42%, rgba(17, 17, 17, 0.16) 100%),
        url('8.jpg') center/cover no-repeat;
}

.download__content {
    max-width: 620px;
    color: #ffffff;
}

.download__title {
    margin-bottom: 24px;
    font-size: clamp(34px, 4vw, 52px);
}

.footer {
    padding: 64px 0;
    background: var(--color-dark);
    color: #ffffff;
}

.footer__container {
    grid-template-columns: 1.3fr repeat(3, minmax(0, 1fr));
}

.footer__column {
    display: grid;
    align-content: start;
    gap: 16px;
}

.footer__title {
    font-size: 18px;
}

.footer__list {
    display: grid;
    gap: 10px;
}

.footer__text,
.footer__link {
    color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 1080px) {
    .header__button,
    .header__phone {
        display: none;
    }

    .reviews__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .gallery__masonry {
        column-count: 3;
    }

    .footer__container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 900px) {
    .section {
        padding: 80px 0;
    }

    .section-heading,
    .cta-banner__container,
    .advantages__container,
    .facade-config__container,
    .consultation__container,
    .footer__container {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .section-heading,
    .cta-banner__container {
        display: grid;
    }

    .catalog__grid,
    .videos__grid,
    .options__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .gallery__masonry {
        column-count: 2;
    }

    .header__burger {
        display: inline-flex;
    }

    .header__nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        padding: 0 20px 20px;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(-10px);
        transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
    }

    .header__nav.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .header__menu {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 20px;
        border-radius: var(--radius-md);
        background: rgba(255, 255, 255, 0.98);
        box-shadow: var(--shadow-card);
    }

    .hero {
        min-height: auto;
    }

    .hero__container {
        min-height: auto;
        padding-top: 36px;
        padding-bottom: 36px;
    }

    .hero__content {
        padding: 28px;
    }
}

@media (max-width: 640px) {
    :root {
        --header-height: 78px;
    }

    .section {
        padding: 64px 0;
    }

    .hero {
        padding-top: 24px;
        padding-bottom: 64px;
    }

    .hero__title {
        font-size: 40px;
    }

    .hero__stats,
    .catalog__grid,
    .reviews__grid,
    .videos__grid,
    .options__grid,
    .advantages__container,
    .facade-config__container,
    .consultation__container,
    .footer__container {
        grid-template-columns: 1fr;
    }

    .gallery__masonry {
        column-count: 1;
    }

    .catalog-card__actions,
    .hero__actions,
    .options__tabs,
    .facade-config__swatches {
        flex-direction: column;
    }

    .facade-config__swatch,
    .options__tab,
    .button,
    .icon-button {
        width: 100%;
    }

    .cta-banner {
        padding-bottom: 64px;
    }

    .cta-banner__container,
    .download__container {
        padding-top: 28px;
        padding-bottom: 28px;
    }

    .download {
        padding: 64px 0;
    }
}