/* АТРИУМ — premium construction landing */
:root {
  --bg: #f3f1ee;
  --bg-elev: #ebe7e1;
  --ink: #14161a;
  --ink-soft: #3a3d44;
  --stone: #7a756c;
  --line: rgba(20, 22, 26, 0.12);
  --accent: #9c7a3c;
  --accent-hover: #856632;
  --white: #faf9f7;
  --hero-veil: linear-gradient(
    180deg,
    rgba(20, 22, 26, 0.55) 0%,
    rgba(20, 22, 26, 0.35) 45%,
    rgba(20, 22, 26, 0.72) 100%
  );

  --font: "Onest", "Segoe UI", sans-serif;
  --font-display: "Onest", "Segoe UI", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.65, 0, 0.35, 1);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3.5rem;
  --space-xl: 6rem;
  --space-2xl: 9rem;

  --max: 72rem;
  --prose: 38rem;
  --header-h: 4.25rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: clamp(1.0625rem, 0.95rem + 0.4vw, 1.25rem);
  line-height: 1.6;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% 0%, rgba(156, 122, 60, 0.06), transparent 55%),
    linear-gradient(180deg, #f6f4f1 0%, var(--bg) 28%, #efece7 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

h1,
h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

h3 {
  margin: 0;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

h2 {
  font-size: clamp(2.15rem, 1.5rem + 2.2vw, 3.35rem);
  max-width: 16ch;
}

p {
  margin: 0;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--white);
  padding: 0.75rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  color: var(--white);
  transition: background 0.45s var(--ease), backdrop-filter 0.45s var(--ease), border-color 0.45s var(--ease), color 0.45s var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(243, 241, 238, 0.86);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  height: 100%;
  padding: 0 clamp(1.25rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav {
  display: none;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
}

.nav a {
  opacity: 0.78;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.nav a:hover {
  opacity: 1;
}

.nav__cta {
  opacity: 1 !important;
  color: #e4c48a;
}

.site-header.is-scrolled .nav__cta {
  color: var(--accent);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid rgba(250, 249, 247, 0.35);
  background: rgba(20, 22, 26, 0.28);
  color: inherit;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  border-radius: 2px;
  backdrop-filter: blur(10px);
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), color 0.35s var(--ease);
}

.site-header.is-scrolled .nav-toggle {
  border-color: var(--line);
  background: rgba(250, 249, 247, 0.55);
}

.nav-toggle__icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 14px;
}

.nav-toggle__line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  border-radius: 1px;
}

.mobile-nav {
  display: grid;
  gap: 0.25rem;
  padding: 0.75rem 1.25rem 1.25rem;
  background: rgba(243, 241, 238, 0.96);
  border-bottom: 1px solid var(--line);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  padding: 0.85rem 0.25rem;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}

.mobile-nav a:last-child {
  border-bottom: 0;
  color: var(--accent);
}

@media (min-width: 900px) {
  .nav {
    display: flex;
  }

  .nav-toggle,
  .mobile-nav {
    display: none !important;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--white);
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.03);
  animation: hero-drift 18s var(--ease-out) infinite alternate;
}

@keyframes hero-drift {
  from {
    transform: scale(1.03) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.08) translate3d(-1.5%, -1%, 0);
  }
}

.hero__veil {
  position: absolute;
  inset: 0;
  background: var(--hero-veil);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--header-h) + 2rem) clamp(1.25rem, 3vw, 2rem) clamp(3rem, 8vh, 5.5rem);
}

.hero__brand {
  font-size: clamp(0.875rem, 0.7rem + 0.6vw, 1rem);
  font-weight: 800;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  color: #e4c48a;
  animation: fade-up 0.9s var(--ease) both;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 1.35rem + 4.2vw, 5.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 13ch;
  margin-bottom: 1.25rem;
  animation: fade-up 0.95s var(--ease) 0.08s both;
}

.hero__lead {
  max-width: 36ch;
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem);
  line-height: 1.55;
  opacity: 0.92;
  margin-bottom: 2rem;
  animation: fade-up 1s var(--ease) 0.16s both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  animation: fade-up 1.05s var(--ease) 0.24s both;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translate3d(0, 28px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.15rem;
  padding: 0.85rem 1.4rem;
  font: inherit;
  font-size: 0.975rem;
  font-weight: 600;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), border-color 0.35s var(--ease), color 0.35s var(--ease);
}

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

.btn--primary {
  background: var(--accent);
  color: #1a140c;
}

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

.btn--ghost {
  background: transparent;
  border-color: rgba(250, 249, 247, 0.45);
  color: var(--white);
}

.btn--ghost:hover {
  border-color: var(--white);
  background: rgba(250, 249, 247, 0.08);
}

.btn--block {
  width: 100%;
}

/* Proof */
.proof {
  padding: var(--space-lg) clamp(1.25rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.proof__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem 1.25rem;
}

.proof__value {
  display: block;
  font-size: clamp(2.5rem, 2rem + 2vw, 3.75rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
}

.proof__label {
  display: block;
  margin-top: 0.45rem;
  color: var(--stone);
  font-size: 0.95rem;
  max-width: 16ch;
}

@media (min-width: 900px) {
  .proof__inner {
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
  }
}

/* Approach */
.approach {
  padding: var(--space-xl) clamp(1.25rem, 3vw, 2rem);
}

.approach__grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: var(--space-lg);
}

.eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.prose {
  margin-top: 1.25rem;
  max-width: var(--prose);
  color: var(--ink-soft);
}

.steps {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.steps__num {
  font-weight: 800;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding-top: 0.2rem;
}

.steps p {
  margin-top: 0.35rem;
  color: var(--stone);
  font-size: 0.975rem;
}

@media (min-width: 960px) {
  .approach__grid {
    grid-template-columns: 1fr 1.1fr;
    gap: 4rem;
    align-items: start;
  }
}

/* Projects */
.projects {
  padding: 0 clamp(1.25rem, 3vw, 2rem) var(--space-xl);
}

.section-head {
  max-width: var(--max);
  margin: 0 auto var(--space-lg);
}

.section-head__lead {
  margin-top: 1rem;
  max-width: 36ch;
  color: var(--ink-soft);
}

.projects__layout {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 1.75rem;
}

.project__media {
  margin: 0;
  overflow: hidden;
  background: var(--bg-elev);
}

.project__media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.9s var(--ease);
}

.project:hover .project__media img {
  transform: scale(1.03);
}

.project__meta {
  padding-top: 1rem;
  display: grid;
  gap: 0.4rem;
}

.project__meta p {
  color: var(--stone);
  font-size: 0.975rem;
  max-width: 34ch;
}

.project--wide .project__media img {
  aspect-ratio: 16 / 9;
}

@media (min-width: 900px) {
  .projects__layout {
    grid-template-columns: repeat(12, 1fr);
    gap: 1.5rem 1.25rem;
  }

  .project--wide {
    grid-column: 1 / -1;
  }

  .project:not(.project--wide):nth-child(2) {
    grid-column: 1 / 7;
  }

  .project:not(.project--wide):nth-child(3) {
    grid-column: 7 / -1;
    margin-top: 4rem;
  }
}

/* Materials */
.materials {
  padding: var(--space-xl) clamp(1.25rem, 3vw, 2rem);
  background: var(--ink);
  color: var(--white);
}

.materials__grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: var(--space-lg);
  align-items: center;
}

.materials__media {
  margin: 0;
  overflow: hidden;
}

.materials__media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.materials .prose {
  color: rgba(250, 249, 247, 0.78);
}

.checklist {
  margin-top: 1.75rem;
  display: grid;
  gap: 0.85rem;
}

.checklist li {
  position: relative;
  padding-left: 1.35rem;
  color: rgba(250, 249, 247, 0.9);
  font-size: 1rem;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 0.55rem;
  height: 1px;
  background: var(--accent);
}

@media (min-width: 960px) {
  .materials__grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 4.5rem;
  }
}

/* Promise band */
.promise {
  padding: var(--space-xl) clamp(1.25rem, 3vw, 2rem);
  background:
    linear-gradient(135deg, rgba(156, 122, 60, 0.12), transparent 45%),
    var(--bg-elev);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.promise__inner {
  max-width: var(--max);
  margin: 0 auto;
}

.promise h2 {
  max-width: 20ch;
  margin-bottom: var(--space-lg);
}

.promise__grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.promise__item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.promise__item h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 1.15rem + 0.6vw, 1.6rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.65rem;
}

.promise__item p {
  color: var(--ink-soft);
  font-size: 0.975rem;
  max-width: 32ch;
  line-height: 1.55;
}

@media (min-width: 900px) {
  .promise__grid {
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .promise__item {
    padding: 1.75rem 1.75rem 1.75rem 0;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .promise__item:first-child {
    padding-left: 0;
  }

  .promise__item:last-child {
    border-right: 0;
    padding-right: 0;
    padding-left: 1.75rem;
  }

  .promise__item:nth-child(2) {
    padding-left: 1.75rem;
  }
}

/* Contact */
.contact {
  padding: var(--space-xl) clamp(1.25rem, 3vw, 2rem) var(--space-2xl);
}

.contact__grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: var(--space-lg);
}

.contact__phone {
  margin-top: 2rem;
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.contact__phone a {
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.contact__phone a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.contact__note {
  margin-top: 0.65rem;
  color: var(--stone);
  font-size: 0.95rem;
}

.form {
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid var(--line);
  padding: clamp(1.25rem, 3vw, 2rem);
  display: grid;
  gap: 1.1rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.form__field {
  display: grid;
  gap: 0.45rem;
}

.form label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.form input,
.form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(250, 249, 247, 0.85);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  padding: 0.85rem 0.95rem;
  border-radius: 2px;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
  outline: none;
  resize: vertical;
}

.form input:focus,
.form textarea:focus {
  border-color: rgba(156, 122, 60, 0.65);
  box-shadow: 0 0 0 3px rgba(156, 122, 60, 0.15);
}

.form__legal {
  font-size: 0.8125rem;
  color: var(--stone);
  line-height: 1.45;
}

.form__success {
  margin: 0;
  padding: 0.85rem 1rem;
  background: rgba(156, 122, 60, 0.12);
  border: 1px solid rgba(156, 122, 60, 0.35);
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
}

.form.is-sent .btn {
  pointer-events: none;
  opacity: 0.55;
}

@media (min-width: 960px) {
  .contact__grid {
    grid-template-columns: 1fr 0.95fr;
    gap: 4rem;
    align-items: start;
  }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem clamp(1.25rem, 3vw, 2rem) 2.25rem;
}

.site-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.site-footer p {
  color: var(--stone);
  font-size: 0.9rem;
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translate3d(0, 32px, 0);
  transition: opacity 0.85s var(--ease), transform 0.85s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (prefers-reduced-motion: reduce) {
  .hero__media img {
    animation: none;
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__brand,
  .hero__title,
  .hero__lead,
  .hero__actions {
    animation: none;
  }
}