/* ===== DESIGN TOKENS ===== */
:root {
  /* ---- Surfaces: a single deep navy family, no second hue ---- */
  --bg:            #121B2A;  /* page background */
  --bg-deep:       #0D141F;  /* footer, image scrims, card bottoms */
  --surface:       #1B2433;  /* cards, chips, panels */
  --surface-2:     #262F3E;  /* form inputs, hover state of surface */
  --glass:         rgba(24, 33, 48, 0.62); /* hero panel, sticky header */

  /* ---- Lines ---- */
  --line:          rgba(255, 255, 255, 0.07);  /* default card border */
  --line-strong:   rgba(255, 255, 255, 0.14);  /* hover / focus border */

  /* ---- Text ---- */
  --text:          #EEF2F8;  /* headings, stat numbers */
  --text-2:        #B4BECC;  /* body copy, nav links */
  --text-3:        #7C8797;  /* captions, eyebrows, consent line */

  /* ---- Inverse (the only "accent" in the system) ---- */
  --ink:           #0E1622;  /* text on white buttons */
  --white:         #FFFFFF;

  /* ---- Radii ---- */
  --r-sm: 10px;   /* inputs, small chips */
  --r-md: 16px;   /* cards */
  --r-lg: 20px;   /* hero glass panel, large media */
  --r-pill: 999px;

  /* ---- Spacing scale (8pt) ---- */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;
  --s-9: 96px; --s-10: 128px;

  /* ---- Layout ---- */
  --container: 1280px;
  --gutter: 24px;
  --rail: 150px;          /* left rail that holds section eyebrows */
  --rail-gap: 26px;
  --section-y: clamp(64px, 7vw, 104px);

  /* ---- Motion ---- */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 420ms;
}

/* ===== BASE ===== */
body {
  background-color: var(--bg);
  color: var(--text-2);
  font-family: 'Inter', -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 15px;
  line-height: 1.62;
  font-weight: 400;
}

/* Headings typography: light weight (200-300), never bold */
h1, h2, h3, .heading-display {
  font-family: 'Manrope', 'Inter', -apple-system, sans-serif;
  color: var(--text);
  font-weight: 300;
}

h2.section-h2 {
  font-size: clamp(24px, 2.2vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 300;
}

:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.65);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--white);
  color: var(--ink);
  font-weight: 500;
  font-size: 14px;
  border-radius: var(--r-sm);
  transform: translateY(-150%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus {
  transform: translateY(0);
}

/* ===== LAYOUT PRIMITIVES ===== */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  width: 100%;
}

section {
  padding-block: var(--section-y);
  scroll-margin-top: 90px;
}

.section-rail {
  display: grid;
  grid-template-columns: var(--rail) 1fr;
  gap: var(--rail-gap);
  align-items: start;
}

.section-rail--variant {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--rail-gap);
  align-items: start;
}

/* ===== COMPONENTS ===== */
/* Eyebrow chip */
.eyebrow-chip {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--text-3);
  line-height: 1;
}

/* Primary button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  background: var(--white);
  color: var(--ink);
  border-radius: var(--r-pill);
  padding: 8px 8px 8px 24px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.btn-primary .badge-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
  transition: transform var(--dur) var(--ease);
}

.btn-primary .badge-icon svg {
  width: 16px;
  height: 16px;
  stroke-width: 1.5;
  transition: transform var(--dur) var(--ease);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.btn-primary:hover .badge-icon svg {
  transform: translateX(3px);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Secondary button */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: var(--white);
  color: var(--ink);
  border-radius: var(--r-pill);
  padding: 6px 6px 6px 18px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.btn-secondary .badge-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
  transition: transform var(--dur) var(--ease);
}

.btn-secondary .badge-icon svg {
  width: 14px;
  height: 14px;
  stroke-width: 1.5;
  transition: transform var(--dur) var(--ease);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.btn-secondary:hover .badge-icon svg {
  transform: translateX(3px);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* Surface card */
.surface-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.surface-card:hover {
  border-color: var(--line-strong);
  background: var(--surface-2);
}

/* Media card */
.media-card {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-deep);
  transition: border-color var(--dur) var(--ease);
}

.media-card-img-wrap {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.media-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms var(--ease), opacity 500ms var(--ease), filter 500ms var(--ease);
}

.media-card .scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to top, rgba(9, 14, 22, 0.92) 0%, rgba(9, 14, 22, 0.72) 34%, rgba(9, 14, 22, 0.10) 68%, rgba(9, 14, 22, 0) 100%);
  pointer-events: none;
}

.media-card-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 18px;
}

.media-card:hover {
  border-color: var(--line-strong);
}

.media-card:hover img {
  transform: scale(1.05);
}

/* Image load blur-up styling */
img.lazy-load {
  opacity: 0;
  filter: blur(12px);
}
img.lazy-loaded {
  opacity: 1;
  filter: blur(0);
}

/* Fallback panel for broken images */
.img-fallback-panel {
  position: absolute;
  inset: 0;
  background: var(--bg-deep);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  gap: 12px;
  border-radius: inherit;
}
.img-fallback-panel svg {
  width: 32px;
  height: 32px;
  stroke: var(--text-3);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 72px;
  display: flex;
  align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 300ms var(--ease), backdrop-filter 300ms var(--ease), border-color 300ms var(--ease);
}

.site-header.is-scrolled {
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-link {
  font-size: 14px;
  color: var(--text-2);
  position: relative;
  padding-block: 4px;
  transition: color 250ms var(--ease);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 250ms var(--ease);
}

.nav-link:hover {
  color: var(--text);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--text);
  background: transparent;
  border-radius: 50%;
  z-index: 102;
}

/* Mobile Nav Drawer Overlay */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 101;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  padding: 80px 24px 40px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms var(--ease);
}

.mobile-nav-overlay.is-active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: auto;
}

.mobile-nav-links .nav-link {
  font-size: 24px;
  color: var(--text);
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 300ms var(--ease), transform 300ms var(--ease);
}

.mobile-nav-overlay.is-active .mobile-nav-links .nav-link {
  opacity: 1;
  transform: translateY(0);
}

.mobile-nav-footer {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.mobile-phone {
  font-size: 18px;
  color: var(--text);
  font-weight: 500;
}

/* ===== HERO ===== */
.hero-section {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
  padding-block: 0;
}

.hero-slider-track {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 700ms var(--ease), visibility 700ms var(--ease);
  overflow: hidden;
}

.hero-slide.is-active {
  opacity: 1;
  visibility: visible;
  z-index: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.06);
  transition: transform 8s var(--ease);
}

.hero-slide.is-active img {
  transform: scale(1);
}

/* Scrims over hero */
.hero-scrim-top {
  position: absolute;
  inset: 0;
  bottom: 60%;
  z-index: 2;
  background: linear-gradient(rgba(9, 14, 22, 0.65), transparent 100%);
  pointer-events: none;
}

.hero-scrim-bottom {
  position: absolute;
  inset: 0;
  top: 40%;
  z-index: 2;
  background: linear-gradient(transparent 0%, rgba(9, 14, 22, 0.55) 100%);
  pointer-events: none;
}

.hero-container {
  position: relative;
  z-index: 3;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-top: 90px;
  padding-bottom: 32px;
}

/* Wordmark AERUM */
.hero-wordmark {
  font-family: 'Manrope', sans-serif;
  font-weight: 200;
  font-size: clamp(64px, 8.8vw, 128px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--white);
  text-transform: uppercase;
  user-select: none;
  width: fit-content;
}

.hero-bottom-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

/* Glass panel bottom-left */
.hero-glass-panel {
  max-width: 470px;
  background: var(--glass);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-lg);
  padding: 26px 26px 22px;
}

.hero-headline {
  font-size: clamp(26px, 2.4vw, 34px);
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.hero-glass-panel .btn-primary {
  margin-top: 22px;
}

/* Controls bottom-right */
.hero-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero-ctrl-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.hero-ctrl-btn:hover {
  background: var(--white);
  color: var(--ink);
}

.hero-ctrl-btn svg {
  width: 14px;
  height: 14px;
  stroke-width: 1.5;
}

/* Entrance Sequence Animations */
[data-entrance] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}

body.is-loaded [data-entrance="1"] {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0ms;
}

body.is-loaded [data-entrance="2"] {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 140ms;
}

body.is-loaded [data-entrance="3"] {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 240ms;
}

/* ===== ABOUT (О компании) ===== */
.about-grid {
  display: grid;
  grid-template-columns: 36% 20% 38%;
  gap: 32px;
  align-items: flex-start;
}

.about-thumb {
  position: relative;
  aspect-ratio: 2.15 / 1;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.about-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms var(--ease);
}

.about-thumb:hover img {
  transform: scale(1.05);
}

.about-text {
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.62;
}

/* ===== STATS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat-number {
  font-family: 'Manrope', sans-serif;
  font-size: clamp(30px, 3vw, 42px);
  font-weight: 200;
  line-height: 1.0;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.stat-suffix, .stat-prefix {
  color: var(--text-2);
  font-weight: 200;
}

.stat-label {
  font-size: 14px;
  color: var(--text);
  font-weight: 400;
}

.stat-caption {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-3);
}

/* ===== SERVICES (Что мы делаем) ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.service-card {
  aspect-ratio: 3 / 2;
}

.service-icon-tile {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  margin-bottom: 12px;
  flex-shrink: 0;
}

.service-icon-tile svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.25;
}

.service-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--white);
  line-height: 1.3;
  margin-bottom: 4px;
}

.service-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-2);
}

/* ===== MATERIALS (Материалы и технологии) ===== */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.material-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 18px;
}

.material-icon {
  width: 40px;
  height: 40px;
  color: var(--text-2);
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.material-icon svg {
  width: 40px;
  height: 40px;
  stroke-width: 1.25;
}

.material-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}

.material-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-3);
}

/* ===== MODELS (Популярные модели) ===== */
.models-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.model-card {
  aspect-ratio: 5 / 4;
}

.model-card-content {
  gap: 6px;
}

.model-name {
  font-size: 17px;
  font-weight: 400;
  color: var(--white);
  line-height: 1.3;
}

.model-specs {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.4;
}

.model-card .btn-secondary {
  margin-top: 10px;
  align-self: flex-start;
}

/* ===== FAQ (Частые вопросы) ===== */
.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.faq-item:hover {
  border-color: var(--line-strong);
}

.faq-trigger {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text);
  font-size: 16px;
  font-weight: 400;
  cursor: pointer;
  line-height: 1.4;
}

.faq-trigger-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-2);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.faq-trigger-icon svg {
  width: 14px;
  height: 14px;
  transition: transform var(--dur) var(--ease);
}

.faq-item.is-open .faq-trigger-icon {
  background: var(--white);
  color: var(--ink);
  transform: rotate(45deg);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 380ms var(--ease), padding 380ms var(--ease);
  padding-inline: 24px;
}

.faq-item.is-open .faq-content {
  max-height: 300px;
  padding-bottom: 22px;
}

.faq-answer {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-2);
}

/* ===== SCHEDULE A MEETING MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(9, 14, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms var(--ease);
}

.modal-overlay.is-active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  padding: 32px;
  max-width: 520px;
  width: 100%;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 300ms var(--ease);
}

.modal-overlay.is-active .modal-card {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}

.modal-close-btn:hover {
  background: var(--white);
  color: var(--ink);
}

.modal-title {
  font-size: 24px;
  font-weight: 300;
  color: var(--text);
  margin-bottom: 6px;
}

.modal-subtitle {
  font-size: 14px;
  color: var(--text-3);
  margin-bottom: 24px;
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.select-input {
  appearance: none;
  background: var(--surface-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23B4BECC' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

.modal-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* Secondary header button */
.btn-meeting-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.btn-meeting-header:hover {
  background: var(--surface-2);
  border-color: var(--white);
}
.contact-layout {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1.15fr) minmax(0, 1fr) 0.9fr;
  gap: 12px;
  align-items: stretch;
}

.contact-rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form-grid {
  grid-column: 2 / span 2;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 12px;
  align-items: stretch;
}

.contact-inputs-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-input,
.form-textarea {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 13px 16px;
  color: var(--text);
  font-size: 14px;
  width: 100%;
  transition: border-color var(--dur) var(--ease), outline var(--dur) var(--ease);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-3);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--line-strong);
  outline: 2px solid rgba(255, 255, 255, 0.22);
  outline-offset: 2px;
}

.form-input.is-invalid,
.form-textarea.is-invalid {
  border-color: #C2544D;
}

.field-error {
  font-size: 12px;
  color: #C2544D;
  margin-top: 2px;
}

.form-textarea {
  min-height: 96px;
  height: 100%;
  resize: vertical;
}

.contact-submit-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 6px;
}

.consent-text {
  font-size: 12px;
  line-height: 1.4;
  color: var(--text-3);
  max-width: 210px;
}

/* Contact interior photo */
.contact-image-wrap {
  position: relative;
  aspect-ratio: 1.95 / 1;
  height: 100%;
  min-height: 180px;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.contact-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms var(--ease);
}

.contact-image-wrap:hover img {
  transform: scale(1.05);
}

/* Spinner inside button during submission */
.spinner-icon {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin 600ms linear infinite;
}

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

/* Success panel state */
.contact-success-panel {
  grid-column: 2 / span 2;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  justify-content: center;
  gap: 14px;
}

.success-check-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.success-title {
  font-size: 20px;
  font-weight: 300;
  color: var(--text);
}

.success-desc {
  font-size: 14px;
  color: var(--text-2);
}

.btn-reset-form {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-3);
  text-decoration: underline;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.btn-reset-form:hover {
  color: var(--text);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding-block: 44px 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.6fr auto;
  gap: 32px;
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-wordmark {
  font-family: 'Manrope', sans-serif;
  font-size: 26px;
  font-weight: 200;
  color: var(--white);
  letter-spacing: -0.02em;
}

.footer-tagline {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-3);
  max-width: 200px;
}

.footer-nav-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 14px;
  color: var(--text-2);
  transition: color 250ms var(--ease);
}

.footer-link:hover {
  color: var(--text);
}

.footer-contacts-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.6;
}

.footer-contacts-col a {
  transition: color 250ms var(--ease);
}

.footer-contacts-col a:hover {
  color: var(--text);
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-end;
}

.social-circle {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-2);
  transition: background-color 250ms var(--ease), border-color 250ms var(--ease), color 250ms var(--ease);
}

.social-circle svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.social-circle:hover {
  background: var(--white);
  border-color: var(--white);
  color: var(--ink);
}

/* ===== UTILITIES & SCROLL REVEAL ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ===== RESPONSIVE MEDIA QUERIES ===== */
@media (max-width: 1280px) {
  :root {
    --gutter: 20px;
  }
}

@media (max-width: 1080px) {
  :root {
    --rail: 120px;
  }

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

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

  .section-rail--variant {
    grid-template-columns: 240px 1fr;
  }

  .contact-layout {
    grid-template-columns: var(--rail) 1fr 1fr;
  }
  .contact-image-wrap {
    display: none;
  }
}

@media (max-width: 900px) {
  /* Rail collapses */
  .section-rail,
  .section-rail--variant {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .section-rail .eyebrow-chip {
    margin-bottom: 12px;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-nav-toggle {
    display: flex;
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .about-thumb {
    aspect-ratio: 2.4 / 1;
    width: 100%;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .contact-form-grid {
    grid-column: 1 / -1;
  }

  .contact-image-wrap {
    display: block;
    grid-column: 1 / -1;
    aspect-ratio: 2.2 / 1;
  }
}

@media (max-width: 680px) {
  :root {
    --section-y: 56px;
  }

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

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

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

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

  .hero-section {
    height: 100vh;
    min-height: 520px;
  }

  .hero-wordmark {
    font-size: 56px;
  }

  .hero-bottom-row {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .hero-glass-panel {
    max-width: 100%;
    padding: 20px;
  }

  .hero-controls {
    align-self: center;
  }

  .contact-form-grid {
    grid-template-columns: 1fr;
  }

  .contact-submit-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .consent-text {
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-socials {
    justify-content: flex-start;
  }
}

@media (max-width: 400px) {
  .hero-headline {
    font-size: 22px;
  }

  .btn-primary {
    padding: 8px 8px 8px 18px;
    gap: 20px;
  }
}