/* ============================================
   THE PEPTIDE DESK - PREMIUM TECH-PHARMA STYLE
   ============================================ */

:root {
  /* Brand Colors */
  --bg-primary: #050810;
  --bg-secondary: #0a1020;
  --bg-tertiary: #0f1830;
  --bg-card: rgba(15, 24, 48, 0.6);
  --bg-card-hover: rgba(20, 32, 60, 0.8);
  
  --accent: #00aaff;
  --accent-bright: #0099ff;
  --accent-glow: rgba(0, 153, 255, 0.4);
  --accent-soft: rgba(0, 153, 255, 0.1);
  
  --text-primary: #e8eef5;
  --text-secondary: #8a9cb5;
  --text-muted: #5a6c85;
  --text-bright: #ffffff;
  
  --border: rgba(0, 153, 255, 0.15);
  --border-strong: rgba(0, 153, 255, 0.3);
  
  --gradient-1: linear-gradient(135deg, #0099ff 0%, #00ddff 100%);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(0, 153, 255, 0.3) 0%, transparent 70%);
  
  /* Typography */
  --font-display: 'Manrope', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --max-width: 1280px;
  --section-padding: 120px;
  
  /* Animation */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-display);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  font-feature-settings: "ss01", "ss02", "cv11";
}

/* ============================================
   BACKGROUND EFFECTS
   ============================================ */

.bg-noise {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: overlay;
}

.bg-gradient {
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse at 20% 0%, rgba(0, 153, 255, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(0, 221, 255, 0.08) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  pointer-events: none;
  z-index: 0;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(0, 153, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 153, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: rgba(0, 153, 255, 0.3);
  top: -200px;
  left: -200px;
  animation: orb-float-1 20s ease-in-out infinite;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: rgba(0, 221, 255, 0.2);
  bottom: -150px;
  right: -150px;
  animation: orb-float-2 25s ease-in-out infinite;
}

.orb-3 {
  width: 400px;
  height: 400px;
  background: rgba(100, 100, 255, 0.15);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: orb-float-3 30s ease-in-out infinite;
}

@keyframes orb-float-1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(100px, 50px) scale(1.1); }
}

@keyframes orb-float-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-80px, -40px) scale(0.9); }
}

@keyframes orb-float-3 {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-40%, -60%) scale(1.2); }
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  background: rgba(5, 8, 16, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-bright);
  font-weight: 700;
  letter-spacing: 0.05em;
  font-size: 14px;
  transition: var(--transition);
}

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

.nav-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px rgba(0, 153, 255, 0.4));
  transition: var(--transition);
}

.nav-logo:hover .nav-logo-img {
  filter: drop-shadow(0 0 12px rgba(0, 153, 255, 0.6));
  transform: scale(1.05);
}

.nav-logo-text {
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover {
  color: var(--text-bright);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.lang-toggle:hover {
  border-color: var(--accent);
}

.lang-active {
  color: var(--accent);
  font-weight: 700;
}

.lang-divider {
  color: var(--text-muted);
}

.lang-inactive {
  color: var(--text-muted);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent-bright), #00ccff);
  color: var(--bg-primary);
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
  box-shadow: 0 0 0 0 var(--accent-glow);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px var(--accent-glow);
}

.nav-cta svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   HERO
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 120px 24px 80px;
  z-index: 2;
}

.hero-bg-vial {
  position: absolute;
  top: 50%;
  right: -100px;
  transform: translateY(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.6;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 2;
}

.hero-logo-feature {
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease-out;
  position: relative;
}

.hero-logo-img {
  max-width: 480px;
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 0 40px rgba(0, 153, 255, 0.3));
}

@media (max-width: 640px) {
  .hero-logo-img {
    max-width: 320px;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  padding: 8px 16px;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { opacity: 0.5; box-shadow: 0 0 0 8px transparent; }
}

.hero-title {
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-line-1 {
  background: linear-gradient(135deg, #ffffff, #b0c4de);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-line-2 {
  background: linear-gradient(135deg, #ffffff, #87ceeb);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-line-3 {
  background: linear-gradient(135deg, var(--accent-bright), #00ddff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 80px var(--accent-glow);
  animation: fadeInUp 0.8s ease-out 0.3s both;
  position: relative;
}

.hero-line-3::after {
  content: '.';
  color: var(--accent);
  -webkit-text-fill-color: var(--accent);
  margin-left: 2px;
  animation: blink 1.5s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero-subtitle {
  font-size: clamp(16px, 1.5vw, 20px);
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 40px;
  line-height: 1.6;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 80px;
  animation: fadeInUp 0.8s ease-out 0.5s both;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: 800px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.stat-value {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  animation: fadeInUp 0.8s ease-out 0.8s both;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--accent), transparent);
  position: relative;
  overflow: hidden;
}

.scroll-line::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 0;
  right: 0;
  height: 20px;
  background: var(--accent);
  animation: scroll-down 2s infinite;
}

@keyframes scroll-down {
  0% { top: -20px; }
  100% { top: 60px; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-bright), #00ccff);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px var(--accent-glow);
}

.btn-primary:hover svg {
  transform: translateX(4px);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-bright);
}

.btn-ghost:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.btn-lg {
  padding: 18px 36px;
  font-size: 16px;
}

.btn-xl {
  padding: 22px 48px;
  font-size: 18px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ============================================
   SECTIONS
   ============================================ */

.section {
  padding: var(--section-padding) 24px;
  position: relative;
  z-index: 2;
}

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

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 24px;
}

.label-num {
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  padding: 4px 8px;
  border-radius: 4px;
  font-weight: 700;
}

.section-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #ffffff, #87ceeb);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title-center {
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-desc {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
  margin-bottom: 40px;
}

.section-desc-center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   ABOUT
   ============================================ */

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 600px;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.feature {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: var(--transition);
}

.feature:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.feature-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 4px;
}

.feature p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.about-visual {
  position: sticky;
  top: 100px;
}

.visual-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  overflow: hidden;
}

.visual-card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: var(--gradient-glow);
  opacity: 0.3;
  pointer-events: none;
}

.visual-card-inner {
  position: relative;
  z-index: 1;
}

.visual-line {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.line-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 8px;
  border-radius: 4px;
  font-weight: 700;
}

.line-text {
  font-size: 14px;
  color: var(--text-bright);
  font-weight: 500;
}

.visual-arrow {
  width: 1px;
  height: 24px;
  background: linear-gradient(180deg, var(--accent), transparent);
  margin: 4px auto;
}

/* ============================================
   STACK BUILDER
   ============================================ */

.stackbuilder-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.check-list {
  list-style: none;
  margin: 32px 0 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.check-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  font-size: 16px;
}

.check-list svg {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
}

.preview-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 100px var(--accent-glow);
  transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
  transition: var(--transition-slow);
}

.preview-card:hover {
  transform: perspective(1000px) rotateY(-2deg) rotateX(1deg);
}

.preview-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  gap: 16px;
}

.preview-dots {
  display: flex;
  gap: 6px;
}

.preview-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
}

.preview-dots span:first-child { background: #ff5f56; }
.preview-dots span:nth-child(2) { background: #ffbd2e; }
.preview-dots span:nth-child(3) { background: #27c93f; }

.preview-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.preview-body {
  padding: 32px 24px;
}

.preview-progress {
  height: 4px;
  background: var(--bg-card);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 24px;
}

.progress-fill {
  width: 16.66%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #00ddff);
  border-radius: 100px;
  animation: progress-glow 2s infinite alternate;
}

@keyframes progress-glow {
  from { box-shadow: 0 0 10px var(--accent-glow); }
  to { box-shadow: 0 0 20px var(--accent-glow); }
}

.preview-body h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-bright);
}

.preview-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preview-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.preview-opt:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.preview-opt.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--text-bright);
}

.opt-emoji {
  font-size: 20px;
}

/* ============================================
   LAB TESTS
   ============================================ */

.labtests-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 60px 0;
}

.labtest-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 32px;
  overflow: hidden;
  transition: var(--transition);
}

.labtest-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.labtest-card-glow {
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, var(--accent-glow), transparent 50%);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.labtest-card:hover .labtest-card-glow {
  opacity: 0.4;
}

.labtest-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  background: var(--accent-soft);
  display: inline-block;
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 700;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}

.labtest-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.labtest-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

.labtests-cta {
  text-align: center;
}

/* ============================================
   SORTIMENT
   ============================================ */

.sortiment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 60px 0;
}

.sort-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: var(--transition);
  cursor: default;
}

.sort-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(0, 153, 255, 0.1);
}

.sort-card-clinical {
  border-color: rgba(255, 165, 0, 0.3);
  background: rgba(255, 165, 0, 0.05);
}

.sort-card-clinical:hover {
  border-color: rgba(255, 165, 0, 0.6);
}

.sort-emoji {
  font-size: 32px;
  margin-bottom: 16px;
  display: block;
}

.sort-card h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.sort-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.sortiment-cta {
  text-align: center;
}

/* ============================================
   FAQ
   ============================================ */

.faq-list {
  max-width: 800px;
  margin: 60px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

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

.faq-item[open] {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.faq-item summary {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  color: var(--text-bright);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary svg {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
  transition: var(--transition);
}

.faq-item[open] summary svg {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 24px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 15px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-top: 0;
}

/* ============================================
   FINAL CTA
   ============================================ */

.section-cta {
  padding: 80px 24px 120px;
}

.cta-card {
  position: relative;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  border: 1px solid var(--border-strong);
  border-radius: 24px;
  padding: 80px 40px;
  text-align: center;
  overflow: hidden;
}

.cta-card-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, var(--accent-glow), transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(0, 221, 255, 0.2), transparent 50%);
  pointer-events: none;
}

.cta-card-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.cta-badge {
  display: inline-block;
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  padding: 6px 14px;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.cta-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.cta-highlight {
  background: linear-gradient(135deg, var(--accent-bright), #00ddff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

.cta-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
}

.cta-small {
  margin-top: 24px;
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  border-top: 1px solid var(--border);
  padding: 60px 24px 40px;
  position: relative;
  z-index: 2;
  background: var(--bg-primary);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px rgba(0, 153, 255, 0.4));
}

.footer-logo-text {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-bright);
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 14px;
  font-family: var(--font-mono);
}

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

.footer-col h5 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

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

.footer-disclaimer {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-divider {
  color: var(--border-strong);
}

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

@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }
  
  .about-grid,
  .stackbuilder-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  
  .about-visual {
    position: static;
  }
  
  .preview-card {
    transform: none;
  }
  
  .labtests-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --section-padding: 80px;
  }
  
  .nav-inner {
    flex-wrap: wrap;
  }
  
  .nav-logo-text {
    font-size: 12px;
  }
  
  .lang-toggle {
    padding: 6px 10px;
    font-size: 11px;
  }
  
  .hero {
    padding: 100px 16px 60px;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .about-features {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .cta-card {
    padding: 48px 24px;
  }
  
  .section {
    padding: var(--section-padding) 16px;
  }
}

/* Scroll-triggered animations via Intersection Observer */
.section-inner > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.section-inner.visible > * {
  opacity: 1;
  transform: translateY(0);
}

.section-inner.visible > *:nth-child(2) { transition-delay: 0.1s; }
.section-inner.visible > *:nth-child(3) { transition-delay: 0.2s; }
.section-inner.visible > *:nth-child(4) { transition-delay: 0.3s; }
.section-inner.visible > *:nth-child(5) { transition-delay: 0.4s; }