/* ===== Variables ===== */
:root {
  --color-bg: #f5f2ee;
  --color-bg-alt: #e8e4de;
  --color-surface: #fff;
  --color-dark: #2c2825;
  --color-text: #3d3935;
  --color-text-muted: #6b6560;
  --color-accent: #8b6914;
  --color-accent-hover: #6d5210;
  --color-border: #d4cfc8;
  --font-sans: 'Manrope', system-ui, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --container: min(1120px, 100% - 2rem);
  --radius: 8px;
  --shadow: 0 4px 20px rgba(44, 40, 37, 0.08);
  --transition: 0.2s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }

/* ===== Layout ===== */
.container {
  width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* ===== Header (minimal, editorial) ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 4rem;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-dark);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.nav a:hover {
  color: var(--color-accent);
}

.nav__phone {
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
  font-size: 0.875rem;
}

.nav__phone:hover {
  color: var(--color-accent-hover);
}

.nav__calc {
  background: var(--color-accent);
  color: white !important;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  white-space: nowrap;
}

.nav__calc:hover {
  background: var(--color-accent-hover);
  color: white !important;
}

.btn-stone {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 1rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.8rem;
  color: #fff;
  text-decoration: none;
  border: none;
  border-radius: 999px;
  white-space: nowrap;
  letter-spacing: 0.02em;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 1px 3px rgba(0, 0, 0, 0.1);
  background-color: #7a7568;
  background-image:
    radial-gradient(ellipse 70% 50% at 30% 40%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    linear-gradient(180deg, rgba(255,255,255,0.06) 0%, transparent 50%, rgba(0,0,0,0.05) 100%);
  background-size: 100% 100%;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  animation: stone-shift 6s ease-in-out infinite;
}

.btn-stone:hover {
  transform: scale(1.02);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 4px 12px rgba(0, 0, 0, 0.12);
}

@keyframes stone-shift {
  0%, 100% { background-color: #7a7568; }
  33% { background-color: #8a8478; }
  66% { background-color: #6e6a5e; }
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-shrink: 0;
  margin-left: auto;
}

.lang-switch__btn {
  padding: 0.25rem;
  line-height: 0;
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
  opacity: 0.7;
}

.lang-switch__btn:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.04);
}

.lang-switch__btn.is-active {
  opacity: 1;
  background: rgba(139, 105, 20, 0.08);
}

.lang-switch__flag {
  display: block;
  line-height: 0;
}

.lang-switch__flag svg {
  display: block;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.burger {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.burger span {
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 1px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  padding-bottom: 4rem;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0.35) 40%, rgba(0, 0, 0, 0.55) 100%),
    url('back/photo.jpg') center top / cover no-repeat;
  z-index: 0;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.25) 0%, transparent 35%, rgba(0, 0, 0, 0.4) 100%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__panel {
  background: rgba(44, 40, 37, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 2rem 2.25rem;
  border-radius: 16px;
  max-width: 36rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.2;
  color: #fff;
  margin: 0 0 1rem;
  max-width: 18ch;
}

.hero__accent {
  color: #e8d48a;
  font-style: italic;
}

.hero__lead {
  font-size: 1.1rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.95);
  max-width: 42ch;
  margin: 0 0 1.5rem;
}

/* Typewriter in header (btn-stone) */
.btn-stone--typewriter .header__typewriter-text {
  display: inline;
}

.header__typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 0.9em;
  margin-left: 1px;
  background: currentColor;
  vertical-align: -0.1em;
  animation: typewriter-cursor 0.9s step-end infinite;
}

@keyframes typewriter-cursor {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero__infographic {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
}

.hero__info-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.hero__info-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.hero__info-value {
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.hero__info-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.75);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__actions .btn--outline {
  border-color: rgba(255, 255, 255, 0.7);
  color: #fff;
}

.hero__actions .btn--outline:hover {
  background: #fff;
  color: var(--color-dark);
  border-color: #fff;
}

.hero__scroll {
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6), 0 2px 8px rgba(0, 0, 0, 0.4);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--color-dark);
  border-color: var(--color-dark);
}

.btn--outline:hover {
  background: var(--color-dark);
  color: var(--color-bg);
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ===== Sections ===== */
.section {
  padding: 4.5rem 0;
}

.section--cases-first {
  padding-top: 5.5rem;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section--dark {
  background: var(--color-dark);
  color: var(--color-bg);
}

.section--dark .section__title,
.section--dark .section__lead,
.section--dark p {
  color: inherit;
}

.section--dark a {
  color: #c9a227;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  color: var(--color-dark);
  margin: 0 0 0.75rem;
}

.section__lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 60ch;
  margin: 0 0 2.5rem;
}

.section--dark .section__lead {
  color: rgba(255,255,255,0.85);
}

/* ===== Water permeability video demo ===== */
.water-demo {
  position: relative;
  margin: 0 0 2.5rem;
  padding: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  box-shadow: var(--shadow);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.water-demo__video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
}
.water-demo__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 1rem 1.25rem;
  background: linear-gradient(to top, rgba(0,0,0,0.78), rgba(0,0,0,0));
  color: #fff;
  font-size: 0.95rem;
  line-height: 1.5;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.water-demo__icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
}
@media (max-width: 600px) {
  .water-demo__video { max-height: 320px; }
  .water-demo__caption { font-size: 0.85rem; padding: 0.75rem 1rem; }
}

/* ===== Feature cards (TerraWay) ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.feature-card {
  background: var(--color-surface);
  padding: 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
}

.feature-card__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 0.5rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* ===== Details teaser ===== */
.details-teaser {
  background: #fdf8ec;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 1.1rem 1.5rem;
  margin: 2rem 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.details-teaser p {
  margin: 0;
  flex: 1;
  min-width: 200px;
  font-size: .95rem;
  color: var(--color-text-muted);
}
.btn--sm {
  font-size: .875rem;
  padding: .45rem 1rem;
  white-space: nowrap;
}

/* ===== R11 block ===== */
.r11-block {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  margin-bottom: 2rem;
  max-width: 55ch;
}

.r11-block__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 1rem;
}

.r11-block p {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}

.r11-block p:last-child {
  margin-bottom: 0;
}

/* ===== Install steps ===== */
.install-steps {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.install-steps__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1rem;
  color: var(--color-dark);
}

.install-steps__list {
  margin: 0;
  padding-left: 1.35rem;
  color: var(--color-text-muted);
}

.install-steps__list li {
  margin-bottom: 0.5rem;
}

.install-steps__list li:last-child {
  margin-bottom: 0;
}

/* ===== Benefits list ===== */
.benefits-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  max-width: 55ch;
}

.benefits-list li {
  position: relative;
  padding-left: 1.75rem;
  color: var(--color-text);
}

.benefits-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ===== Wellbeing (body & self-care) ===== */
.section--wellbeing {
  position: relative;
  background-image: url('body/for_legs.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;
}

.section--wellbeing::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 0;
}

.section--wellbeing .container {
  position: relative;
  z-index: 1;
}

.section--wellbeing .section__title {
  color: #fff;
}

.section--wellbeing .section__lead {
  color: rgba(255, 255, 255, 0.92);
}

.section--wellbeing .wellbeing-list li {
  color: rgba(255, 255, 255, 0.95);
}

.wellbeing-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  max-width: 52ch;
}

.wellbeing-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--color-text);
  line-height: 1.55;
}

.wellbeing__icon {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.applications__dream {
  font-size: 1.05rem;
  color: var(--color-accent);
  font-weight: 500;
  margin: -0.5rem 0 1.5rem;
  max-width: 36ch;
}

/* ===== Applications grid ===== */
.applications-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.app-tag {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--color-text);
  box-shadow: var(--shadow);
}

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 0.75rem;
}

.service-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ===== Cases ===== */
.section--cases-first .section__title {
  letter-spacing: -0.02em;
}

.cases-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.cases-tabs__tab {
  padding: 0.55rem 1.1rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.cases-tabs__tab:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(139, 105, 20, 0.12);
}

.cases-tabs__tab[aria-selected="true"] {
  color: #fff;
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 2px 10px rgba(139, 105, 20, 0.3);
}

.case-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  grid-template-rows: auto auto;
  gap: 0;
  background: var(--color-surface);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(44, 40, 37, 0.1), 0 1px 3px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--color-border);
}

.case-card__gallery {
  grid-column: 1;
  grid-row: 1;
  min-width: 0;
}

.case-card__info {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.case-card__actions {
  grid-column: 1 / -1;
  grid-row: 2;
  display: flex;
  justify-content: center;
  padding: 1.25rem 2rem;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.02));
  border-top: 1px solid var(--color-border);
}

.case-card__load-err {
  grid-column: 1 / -1;
  grid-row: 1 / -1;
  z-index: 2;
}

.case-card--loading {
  min-height: 280px;
  grid-template-rows: auto;
  place-items: center;
}

.case-card--loading .case-card__gallery,
.case-card--loading .case-card__info,
.case-card--loading .case-card__actions {
  display: none;
}

.case-card--loading::before {
  content: '';
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: case-spin 0.8s linear infinite;
}

.case-card[data-load-error="1"]::before {
  content: none;
}

.case-card__load-err {
  display: none;
  padding: 1rem 2rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.case-card[data-load-error="1"] .case-card__load-err {
  display: block;
}

.case-card[data-load-error="1"] .case-card__gallery,
.case-card[data-load-error="1"] .case-card__info,
.case-card[data-load-error="1"] .case-card__actions {
  display: none;
}

@keyframes case-spin {
  to { transform: rotate(360deg); }
}

.case-card__gallery {
  position: relative;
  aspect-ratio: 4/3;
  background: var(--color-bg-alt);
}

.case-carousel__track {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.case-carousel__list {
  display: flex;
  height: 100%;
  transition: transform 0.3s ease;
}

.case-carousel__slide {
  flex: 0 0 100%;
  height: 100%;
  position: relative;
}

.case-carousel__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-carousel__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.5rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.case-carousel__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.case-carousel__btn:hover {
  background: var(--color-accent-hover);
}

.case-carousel__btn--prev {
  left: 12px;
}

.case-carousel__btn--next {
  right: 12px;
}

.case-carousel__btn[hidden] {
  display: none;
}

.case-card__info {
  padding: 2rem 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.case-card__title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 1.25rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.case-card__meta {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.case-card__meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.case-card__meta-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.case-card__meta-value {
  font-weight: 600;
  color: var(--color-dark);
}

.btn--cost {
  min-width: 260px;
  padding: 0.9rem 1.75rem;
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  .case-card {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }

  .case-card__gallery {
    grid-row: 1;
    aspect-ratio: 16/10;
  }

  .case-card__info {
    grid-column: 1;
    grid-row: 2;
  }

  .case-card__actions {
    grid-row: 3;
    padding: 1rem 1.25rem;
  }

  .btn--cost {
    width: 100%;
    max-width: 320px;
    min-width: 0;
  }
}

/* ===== Contact ===== */
.contact-block {
  max-width: 40ch;
}

.contact-block p {
  margin: 0 0 0.5rem;
}

.contact-phone {
  margin-top: 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.contact-phone a {
  color: inherit;
}

.contact-phone a:hover {
  color: #c9a227;
}

.contact-telegram {
  margin-top: 0.5rem;
  font-size: 1rem;
}

.contact-telegram a:hover {
  color: #c9a227;
}

/* ===== Floating Button ===== */
.fab {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: 0 4px 12px rgba(139, 105, 20, 0.3);
  transition: all var(--transition);
  z-index: 99;
  text-decoration: none;
}

.fab:hover {
  background: var(--color-accent-hover);
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(139, 105, 20, 0.4);
}

.fab:active {
  transform: scale(0.95);
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 0;
  background: var(--color-dark);
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer a {
  color: rgba(255, 255, 255, 0.9);
}

.footer a:hover {
  color: #c9a227;
}

.footer__copy {
  margin: 0;
  font-weight: 500;
}

.footer__note {
  margin: 0;
  font-size: 0.8rem;
  opacity: 0.75;
}

/* ===== Responsive (mobile-first optimizations) ===== */
@media (max-width: 768px) {
  .fab {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 56px;
    height: 56px;
    font-size: 1.5rem;
  }

  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .section--cases-first {
    padding-top: 5rem;
  }

  .section__title {
    font-size: 1.5rem;
  }

  .section__lead {
    font-size: 1rem;
  }

  .nav {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 1.25rem 1.5rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s;
  }

  .nav a {
    padding: 0.75rem 0;
    font-size: 1rem;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .nav.nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__calc {
    background: var(--color-accent);
    color: white !important;
    border-radius: var(--radius);
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }

  .nav__calc:hover {
    background: var(--color-accent-hover);
  }

  .nav__phone {
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
  }

  .header__inner {
    gap: 1rem;
  }

  .lang-switch__btn {
    padding: 0.4rem 0.5rem;
    min-width: 44px;
    min-height: 44px;
  }

  .btn-stone {
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
    white-space: normal;
    text-align: center;
    line-height: 1.25;
    min-height: 44px;
  }

  .burger {
    display: flex;
    padding: 10px;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
  }

  .hero {
    min-height: 100svh;
    padding-top: 4.5rem;
    padding-bottom: 3rem;
  }

  .hero__panel {
    padding: 1.5rem 1.25rem;
    border-radius: 12px;
  }

  .hero__title {
    font-size: 1.65rem;
    max-width: none;
  }

  .hero__lead {
    font-size: 1rem;
  }

  .hero__infographic {
    gap: 1rem 1.5rem;
    margin-bottom: 1.25rem;
  }

  .hero__info-value {
    font-size: 1rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .hero__actions .btn {
    min-height: 48px;
    justify-content: center;
  }

  .hero__scroll {
    font-size: 0.75rem;
    bottom: 1.5rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
  }

  .feature-card {
    padding: 1.25rem;
  }

  .r11-block {
    padding: 1.25rem;
    margin-bottom: 1.5rem;
  }

  .r11-block__title {
    font-size: 1rem;
  }

  .r11-block p {
    font-size: 0.9rem;
  }

  .case-card__info {
    padding: 1.25rem;
  }

  .case-card__title {
    font-size: 1.25rem;
  }

  .case-carousel__btn {
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
  }

  .case-carousel__btn--prev {
    left: 8px;
  }

  .case-carousel__btn--next {
    right: 8px;
  }

  .cases-tabs__tab {
    padding: 0.6rem 0.9rem;
    min-height: 44px;
    font-size: 0.9rem;
  }

  .btn--cost {
    min-height: 48px;
    width: 100%;
    max-width: none;
  }

  .applications-grid {
    gap: 0.5rem;
  }

  .app-tag {
    padding: 0.5rem 0.85rem;
    font-size: 0.85rem;
  }

  .contact-phone a {
    display: inline-block;
    padding: 0.25rem 0;
    min-height: 44px;
    line-height: 1.4;
  }

  .install-steps {
    padding: 1.25rem;
  }

  .benefits-list {
    padding-right: 0;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .section--cases-first {
    padding-top: 4.5rem;
  }

  .hero__panel {
    padding: 1.25rem 1rem;
  }

  .hero__title {
    font-size: 1.45rem;
  }

  .hero__infographic {
    flex-direction: column;
    gap: 0.75rem;
  }

  .case-card__gallery {
    aspect-ratio: 4/3;
  }

  .install-steps__list {
    padding-left: 1.2rem;
  }

  .footer__inner {
    text-align: center;
  }
}