/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: #000;
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

/* ===== CSS VARS ===== */
:root {
  --accent: #2B6EFF;
  --accent-glow: rgba(43,110,255,0.3);
  --white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-400: #aaaaaa;
  --gray-600: #666666;
  --gray-800: #222222;
  --gray-900: #111111;
  --black: #000000;
  --border: rgba(255,255,255,0.08);
  --transition: 0.6s cubic-bezier(0.25,0.46,0.45,0.94);
  --transition-fast: 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
}

/* ===== TYPOGRAPHY ===== */
h1,h2,h3,h4 { font-family: 'Montserrat', sans-serif; font-weight: 700; line-height: 1.15; }
.label {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 48px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-fast), backdrop-filter var(--transition-fast);
}
.nav.scrolled {
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.nav-logo img { height: 28px; width: auto; }
.nav-logo-text {
  font-family: 'Montserrat', sans-serif;
  font-weight: 500;
  font-size: 0.65rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  line-height: 1;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
  list-style: none;
}
.nav-links a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.7);
  transition: color var(--transition-fast);
}
.nav-links a:hover { color: var(--white); }
.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-back {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}
.nav-back:hover { color: rgba(255,255,255,0.7); }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--accent);
  color: var(--white);
  font-family: 'Montserrat', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.btn-primary:hover {
  background: #1a5de8;
  box-shadow: 0 8px 30px var(--accent-glow);
  transform: translateY(-1px);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--white);
  font-family: 'Montserrat', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.btn-ghost:hover {
  border-color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.05);
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--white);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
.nav-mobile-menu {
  display: none;
  position: fixed;
  top: 72px; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.97);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu a {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.4);
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,5,0.3) 60%, transparent 100%);
}
#wave-canvas {
  position: absolute;
  inset: 0;
  opacity: 0.4;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 48px;
  padding-top: 72px;
}
.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  opacity: 0;
  transform: translateY(20px);
}
.hero-label::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--accent);
}
.hero h1 {
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.0;
  text-transform: uppercase;
  margin-bottom: 28px;
  max-width: 800px;
  opacity: 0;
  transform: translateY(30px);
}
.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  font-weight: 300;
  color: rgba(255,255,255,0.7);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(20px);
}
.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
}
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  animation: scroll-hint 2s 2s ease forwards;
}
.hero-scroll span {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}
.scroll-arrow {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
  animation: scroll-line 1.5s 2s ease-in-out infinite;
}
@keyframes scroll-hint { to { opacity: 1; } }
@keyframes scroll-line {
  0%,100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.5); opacity: 0.3; }
}

/* ===== PROBLEM ===== */
.section { padding: 120px 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 48px; }

.problem {
  background: var(--black);
  overflow: hidden;
}
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: stretch;
  min-height: 600px;
}
.problem-image {
  position: relative;
  overflow: hidden;
}
.problem-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.6) saturate(0.7);
  transition: transform 8s ease;
}
.problem-image:hover img { transform: scale(1.03); }
.problem-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, transparent 60%, var(--black));
}
.problem-content {
  padding: 80px 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.problem-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0 48px;
  letter-spacing: -0.02em;
}
.problem-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 40px;
}
.problem-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(255,255,255,0.02);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  opacity: 0;
  transform: translateY(20px);
}
.problem-card:hover {
  border-color: rgba(43,110,255,0.3);
  background: rgba(43,110,255,0.04);
}
.problem-card-icon {
  font-size: 1.4rem;
  margin-bottom: 12px;
}
.problem-card h4 {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.problem-conclusion {
  padding-top: 32px;
  border-top: 1px solid var(--border);
  color: rgba(255,255,255,0.6);
  font-size: 0.95rem;
  line-height: 1.8;
  opacity: 0;
}
.problem-conclusion strong { color: var(--white); }

/* ===== HERO BG image Ken Burns ===== */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.4);
  transform-origin: center center;
  animation: kenBurns 24s ease-in-out infinite alternate;
}
@keyframes kenBurns {
  0%   { transform: scale(1.0) translate(0,    0);    }
  33%  { transform: scale(1.07) translate(-1.5%, -1%); }
  66%  { transform: scale(1.04) translate(1.5%,  0.5%);}
  100% { transform: scale(1.08) translate(0,    -1.5%);}
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,5,0.3) 60%, transparent 100%);
}

/* ===== APPROACH ===== */
.approach {
  background: var(--gray-900);
  padding: 120px 0 0;
}
.approach-header {
  text-align: center;
  max-width: 580px;
  margin: 0 auto 72px;
}
.approach-header h2 {
  font-size: clamp(1.8rem, 2.5vw, 2.6rem);
  margin: 16px 0 0;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border-top: 1px solid var(--border);
}
.approach-card {
  background: var(--gray-900);
  padding: 48px 40px;
  position: relative;
  overflow: hidden;
  transition: background var(--transition-fast);
}
.approach-card:hover {
  background: rgba(43,110,255,0.04);
}
.ac-num {
  position: absolute;
  top: 16px;
  right: 20px;
  font-family: 'Montserrat', sans-serif;
  font-size: 5rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(255,255,255,0.04);
  pointer-events: none;
  user-select: none;
}
.ac-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(43,110,255,0.1);
  border: 1px solid rgba(43,110,255,0.2);
  border-radius: 8px;
  color: var(--accent);
  margin-bottom: 24px;
  flex-shrink: 0;
}
.approach-card h3 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  line-height: 1.3;
}
.approach-card p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.45);
  line-height: 1.75;
  margin: 0;
}

/* ===== DIGITAL TWIN ===== */
.twin {
  background: var(--black);
  padding: 120px 0;
}
.twin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.twin-tour {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 16/10;
  border: 1px solid var(--border);
  box-shadow: 0 0 80px rgba(43,110,255,0.15);
}
.twin-tour iframe {
  width: 100%;
  height: 100%;
  border: none;
}
.twin-tour::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 8px;
  border: 1px solid rgba(43,110,255,0.3);
  pointer-events: none;
  box-shadow: 0 0 40px rgba(43,110,255,0.1) inset;
}
.twin-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0 28px;
  letter-spacing: -0.02em;
}
.twin-content p {
  color: rgba(255,255,255,0.65);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 40px;
}
.twin-benefits {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.twin-benefit {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.twin-benefit:hover {
  border-color: rgba(43,110,255,0.35);
  background: rgba(43,110,255,0.04);
}
.twin-benefit-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(43,110,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}
.twin-benefit h4 {
  font-size: 0.9rem;
  margin-bottom: 4px;
}
.twin-benefit p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin: 0;
}

/* ===== DIRECTIONS ===== */
.directions {
  background: var(--gray-900);
  padding: 120px 0 0;
}
.directions-header {
  text-align: center;
  margin-bottom: 56px;
}
.directions-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0;
  letter-spacing: -0.02em;
}
.tabs-nav {
  display: flex;
  justify-content: center;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.tab-btn {
  padding: 16px 32px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  bottom: -1px;
}
.tab-btn.active {
  color: var(--white);
  border-bottom-color: var(--accent);
}
.tab-btn:hover:not(.active) { color: rgba(255,255,255,0.7); }
.tabs-content {
  position: relative;
  height: 560px;
  overflow: hidden;
}
.tab-panel {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.7s ease;
  pointer-events: none;
}
.tab-panel.active { opacity: 1; pointer-events: auto; }
.tab-panel-bg {
  position: absolute;
  inset: 0;
}
.tab-panel-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.35) saturate(0.8);
}
.tab-panel-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.85) 40%, transparent);
}
.tab-panel-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 80px;
  max-width: 600px;
}
.tab-panel-inner h3 {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  margin: 16px 0 20px;
  letter-spacing: -0.02em;
}
.tab-panel-inner p {
  color: rgba(255,255,255,0.65);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 32px;
}

/* ===== SOLUTIONS ===== */
.solutions {
  background: var(--black);
  padding: 120px 0;
}
.solutions-header {
  text-align: center;
  margin-bottom: 64px;
}
.solutions-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0;
  letter-spacing: -0.02em;
}
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.solution-card {
  position: relative;
  padding: 56px 48px;
  background: var(--gray-900);
  overflow: hidden;
  cursor: pointer;
  group: true;
}
.solution-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--border);
  transition: background var(--transition-fast);
}
.solution-card:hover::before { background: var(--accent); }
.solution-num {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 24px;
}
.solution-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.solution-card > p {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 32px;
}
.solution-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.6s cubic-bezier(0.25,0.46,0.45,0.94), opacity 0.4s ease;
  opacity: 0;
}
.solution-card:hover .solution-list {
  max-height: 300px;
  opacity: 1;
}
.solution-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}
.solution-list li::before {
  content: '—';
  color: var(--accent);
  flex-shrink: 0;
}
.solution-arrow {
  position: absolute;
  bottom: 48px;
  right: 48px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.solution-card:hover .solution-arrow {
  border-color: var(--accent);
  background: var(--accent);
  transform: translate(4px, -4px);
}
.solution-arrow svg { width: 16px; height: 16px; }

/* ===== PROCESS ===== */
.process {
  background: var(--gray-900);
  padding: 120px 0;
  overflow: hidden;
}
.process-header {
  text-align: center;
  margin-bottom: 80px;
}
.process-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0;
  letter-spacing: -0.02em;
}
.process-timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 0;
}
.process-timeline::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(100% / 16);
  right: calc(100% / 16);
  height: 1px;
  background: var(--border);
}
.process-line-fill {
  position: absolute;
  top: 28px;
  left: calc(100% / 16);
  height: 1px;
  background: var(--accent);
  width: 0;
  transition: width 1.5s cubic-bezier(0.25,0.46,0.45,0.94);
  box-shadow: 0 0 10px var(--accent-glow);
}
.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: 0;
  opacity: 0;
  transform: translateY(20px);
}
.step-dot {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--gray-900);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}
.step-dot svg {
  width: 18px;
  height: 18px;
  color: rgba(255,255,255,0.4);
  transition: color var(--transition-fast);
}
.process-step.done .step-dot {
  border-color: var(--accent);
  background: rgba(43,110,255,0.1);
  box-shadow: 0 0 20px var(--accent-glow);
}
.process-step.done .step-dot svg { color: var(--accent); }
.step-num {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 8px;
}
.process-step h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.process-step p {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.45);
  line-height: 1.5;
  padding: 0 8px;
}

/* ===== SYSTEMS ===== */
.systems {
  background: var(--black);
  padding: 120px 0;
}
.systems-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.systems-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 4px;
  border-radius: 8px;
  overflow: hidden;
  height: 520px;
}
.systems-images .img-main {
  grid-column: 1 / -1;
  overflow: hidden;
}
.systems-images .img-secondary {
  overflow: hidden;
}
.systems-images img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.8) saturate(0.9);
  transition: transform var(--transition), filter var(--transition);
}
.systems-images img:hover {
  transform: scale(1.04);
  filter: brightness(0.9) saturate(1);
}
.systems-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0 28px;
  letter-spacing: -0.02em;
}
.systems-content p {
  color: rgba(255,255,255,0.6);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 40px;
}
.systems-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.spec-item {
  padding: 20px 0;
  border-top: 1px solid var(--border);
}
.spec-item .spec-val {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 4px;
}
.spec-item .spec-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.05em;
}

/* ===== CASES ===== */
.cases {
  background: var(--gray-900);
  padding: 120px 0;
}
.cases-header {
  text-align: center;
  margin-bottom: 64px;
}
.cases-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 16px 0 16px;
  letter-spacing: -0.02em;
}
.cases-header p { color: rgba(255,255,255,0.5); }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}
.case-card {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  cursor: pointer;
}
.case-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.55) saturate(0.8);
  transition: transform var(--transition), filter var(--transition);
}
.case-card:hover img {
  transform: scale(1.06);
  filter: brightness(0.45) saturate(0.7);
}
.case-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 60%);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  transition: background var(--transition-fast);
}
.case-card:hover .case-overlay {
  background: linear-gradient(to top, rgba(0,0,0,0.95) 20%, rgba(0,0,0,0.4) 100%);
}
.case-tag {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(43,110,255,0.3);
  border: 1px solid rgba(43,110,255,0.5);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-radius: 2px;
  margin-bottom: 10px;
  width: fit-content;
}
.case-overlay h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.case-meta {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 16px;
}
.case-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.case-card:hover .case-link {
  opacity: 1;
  transform: translateY(0);
}

/* ===== CTA ===== */
.cta {
  position: relative;
  padding: 160px 0;
  overflow: hidden;
}
.cta-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.2) saturate(0.6);
}
.cta-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(43,110,255,0.15) 0%, rgba(0,0,0,0.5) 70%);
}
.cta-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  padding: 0 48px;
}
.cta-content h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin: 16px 0 20px;
  letter-spacing: -0.02em;
}
.cta-content > p {
  color: rgba(255,255,255,0.6);
  font-size: 1.1rem;
  margin-bottom: 56px;
}
.cta-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  text-align: left;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group.full { grid-column: 1 / -1; }
.form-group label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}
.form-group input,
.form-group select,
.form-group textarea {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 14px 16px;
  color: var(--white);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: rgba(43,110,255,0.05);
}
.form-group select option { background: #111; color: #fff; }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 8px;
}
.form-privacy {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.35);
}
.form-privacy a { color: rgba(255,255,255,0.5); text-decoration: underline; }
.form-success {
  display: none;
  text-align: center;
  padding: 40px;
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
}

/* ===== FOOTER ===== */
.footer {
  background: #050505;
  padding: 80px 0 40px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
}
.footer-grid--slim {
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}
.footer-brand img { height: 36px; margin-bottom: 10px; }
.footer-brand-sub {
  font-size: 0.65rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 500;
}
.footer-brand p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
  line-height: 1.7;
}
.footer-col h5 {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}
.footer-col ul a:hover { color: var(--white); }
.footer-contacts { display: flex; flex-direction: column; gap: 12px; }
.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
}
.footer-contact-item .icon { font-size: 1rem; flex-shrink: 0; }
.footer-contact-item a {
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}
.footer-contact-item a:hover { color: var(--accent); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 16px;
}
.footer-copy { font-size: 0.8rem; color: rgba(255,255,255,0.3); }
.footer-links { display: flex; gap: 24px; }
.footer-links a {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.35);
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: rgba(255,255,255,0.7); }

/* ===== ANIMATIONS ===== */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */

/* --- Tablet (≤1024px) --- */
@media (max-width: 1024px) {
  .nav { padding: 0 24px; height: 64px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-back { display: none; }

  .problem-grid { grid-template-columns: 1fr; }
  .problem-image { height: 300px; }
  .problem-image::after { background: linear-gradient(to top, var(--black) 15%, transparent); }

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

  .twin-grid { grid-template-columns: 1fr; gap: 40px; }
  .systems-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
}

/* --- Mobile (≤768px) --- */
@media (max-width: 768px) {
  :root { font-size: 15px; }

  /* NAV */
  .nav { padding: 0 20px; height: 60px; }
  .nav-logo img { height: 24px; }
  .nav-logo-text { font-size: 0.6rem; }
  .btn-primary { padding: 10px 18px; font-size: 0.7rem; display: none; }

  /* CONTAINER */
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }

  /* HERO */
  .hero-content { padding: 80px 20px 0; }
  .hero h1 { font-size: clamp(1.9rem, 7vw, 2.8rem); }
  .hero-sub { font-size: 0.9rem; }
  .hero-btns { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero-btns .btn-primary { display: inline-flex; }

  /* PROBLEM */
  .problem-content { padding: 40px 20px; }
  .problem-cards { grid-template-columns: 1fr 1fr; gap: 12px; }
  .problem-card { padding: 16px; }

  /* APPROACH mobile */
  .approach { padding: 64px 0 0; }
  .approach-header { margin-bottom: 48px; }
  .approach-grid { grid-template-columns: 1fr; }
  .approach-card { padding: 32px 24px; }
  .ac-num { font-size: 3.5rem; }

  /* TWIN */
  .twin { padding: 64px 0; }
  .twin-grid { grid-template-columns: 1fr; gap: 32px; }
  .twin-tour { aspect-ratio: 9/16; }
  .twin-benefit { padding: 16px; }

  /* DIRECTIONS */
  .directions { padding: 64px 0 0; }
  .tabs-nav { overflow-x: auto; white-space: nowrap; display: flex; padding-bottom: 0; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .tabs-nav::-webkit-scrollbar { display: none; }
  .tab-btn { padding: 14px 20px; font-size: 0.72rem; flex-shrink: 0; }
  .tabs-content { height: 70vw; min-height: 320px; max-height: 480px; }
  .tab-panel-content { padding: 0 24px; }
  .tab-panel-inner h3 { font-size: 1.3rem; }
  .tab-panel-inner p { font-size: 0.88rem; }

  /* SOLUTIONS */
  .solutions { padding: 64px 0; }
  .solutions-grid { grid-template-columns: 1fr; }
  .solution-card { padding: 36px 28px; }
  .solution-list { max-height: 200px; opacity: 1; }

  /* PROCESS */
  .process { padding: 64px 0; }
  .process-timeline { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
  .process-timeline::before, .process-line-fill { display: none; }
  .process-step { padding-top: 0; }
  .step-dot { width: 44px; height: 44px; margin-bottom: 14px; }
  .step-dot svg { width: 15px; height: 15px; }
  .process-step h4 { font-size: 0.75rem; }
  .process-step p { font-size: 0.7rem; }

  /* SYSTEMS */
  .systems { padding: 64px 0; }
  .systems-grid { grid-template-columns: 1fr; gap: 40px; }
  .systems-images { height: 56vw; min-height: 220px; }
  .systems-specs { grid-template-columns: 1fr 1fr; }

  /* CASES */
  .cases { padding: 64px 0; }
  .cases-grid { grid-template-columns: 1fr; }
  .case-card { aspect-ratio: 16/9; }

  /* CTA */
  .cta { padding: 80px 0; }
  .cta-content { padding: 0 20px; }
  .cta-form { grid-template-columns: 1fr; }
  .form-submit { flex-direction: column; align-items: stretch; }
  .form-submit .btn-primary { width: 100%; justify-content: center; }

  /* FOOTER */
  .footer { padding: 56px 0 32px; }
  .footer-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-brand img { height: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 12px; }
  .footer-links { flex-wrap: wrap; gap: 16px; }
}

/* --- Small mobile (≤480px) --- */
@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .problem-cards { grid-template-columns: 1fr; }
  .process-timeline { grid-template-columns: repeat(2, 1fr); }
  .systems-specs { grid-template-columns: 1fr 1fr; }
  .twin-content h2 { font-size: 1.6rem; }
  .solutions-header h2, .cases-header h2, .cta-content h2 { font-size: 1.6rem; }
}