/* ============================================
   ТОО ТураЕл — Design System & Styles
   ============================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors */
  --color-primary: #0F4C81;
  --color-primary-dark: #0A3A66;
  --color-primary-light: #123A63;
  --color-secondary: #17A2A6;
  --color-secondary-light: #38BDF8;
  --color-accent: #F59E0B;
  --color-accent-warm: #EAB308;

  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-bg-blue: #EFF6FF;
  --color-bg-section: #F1F5F9;

  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #64748B;

  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height: 1.7;
  --line-height-tight: 1.25;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(15, 76, 129, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 76, 129, 0.08);
  --shadow-lg: 0 8px 30px rgba(15, 76, 129, 0.1);
  --shadow-card: 0 2px 8px rgba(15, 76, 129, 0.06), 0 0 0 1px rgba(15, 76, 129, 0.04);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Header */
  --header-height: 72px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- Section --- */
.section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-3xl);
}

.section-tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  background: rgba(23, 162, 166, 0.08);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.section-desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.8rem 1.8rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(15, 76, 129, 0.25);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 16px rgba(15, 76, 129, 0.3);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.25);
}

.btn-accent:hover {
  background: var(--color-accent-warm);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.55rem 1.3rem;
  font-size: var(--font-size-sm);
}

.btn-full {
  width: 100%;
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.logo-icon svg {
  display: block;
}

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

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
  border-radius: 1px;
}

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

.nav-links a:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 10px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 130px;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  overflow: hidden;
  z-index: 100;
}

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

.lang-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 16px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.lang-option:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.lang-option.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  background: var(--color-bg-blue);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  padding-top: calc(var(--header-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  background: linear-gradient(175deg, var(--color-bg-blue) 0%, var(--color-bg) 60%);
  overflow: hidden;
}

.hero-bg-pattern {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background:
    radial-gradient(circle at 70% 30%, rgba(56, 189, 248, 0.06) 0%, transparent 60%),
    radial-gradient(circle at 30% 70%, rgba(15, 76, 129, 0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height);
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-secondary);
  margin-bottom: var(--space-xl);
  padding: var(--space-xs) var(--space-md);
  background: rgba(23, 162, 166, 0.08);
  border-radius: var(--radius-full);
  display: inline-block;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-diagram {
  width: 100%;
  max-width: 500px;
  height: auto;
}

/* Hero SVG animations */
.conn-line {
  animation: dashMove 8s linear infinite;
}

@keyframes dashMove {
  to { stroke-dashoffset: -40; }
}

.edge-node {
  animation: edgePulse 4s ease-in-out infinite;
}

.edge-node:nth-child(2) { animation-delay: 0.5s; }
.edge-node:nth-child(3) { animation-delay: 1s; }
.edge-node:nth-child(4) { animation-delay: 1.5s; }
.edge-node:nth-child(5) { animation-delay: 2s; }

@keyframes edgePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.85; }
}

/* ============================================
   ABOUT
   ============================================ */
.about {
  background: var(--color-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-text p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.highlight-card {
  padding: var(--space-xl);
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.highlight-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border);
}

.highlight-icon {
  margin-bottom: var(--space-md);
}

.highlight-card h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.highlight-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ============================================
   PLATFORM / FEATURES
   ============================================ */
.platform {
  background: var(--color-bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-secondary);
  transform: translateY(-2px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(23, 162, 166, 0.08);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.feature-card h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================
   ARCHITECTURE
   ============================================ */
.architecture {
  background: var(--color-bg);
}

.arch-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.arch-diagram-wrap {
  background: var(--color-bg-alt);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
}

.arch-diagram {
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
  display: block;
}

.arch-conn {
  animation: dashMove 10s linear infinite;
}

.arch-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.arch-feature-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.arch-feature-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 158, 11, 0.08);
  border-radius: var(--radius-md);
}

.arch-feature-item h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.arch-feature-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================
   ADVANTAGES
   ============================================ */
.advantages {
  background: var(--color-bg-alt);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.advantage-card {
  padding: var(--space-xl);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.advantage-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.advantage-card:hover::before {
  opacity: 1;
}

.advantage-number {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-secondary-light);
  opacity: 0.3;
  margin-bottom: var(--space-md);
  line-height: 1;
}

.advantage-card h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.advantage-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how-it-works {
  background: var(--color-bg);
}

.steps {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 28px;
  width: 2px;
  height: calc(100% - 56px);
  background: linear-gradient(to bottom, var(--color-secondary), var(--color-primary));
  opacity: 0.15;
  border-radius: 1px;
}

.step {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-blue);
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  position: relative;
  z-index: 1;
}

.step-content {
  padding-top: var(--space-sm);
}

.step-content h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.step-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================
   AUDIENCE
   ============================================ */
.audience {
  background: var(--color-bg-alt);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
}

.audience-card {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.audience-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.audience-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-blue);
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.audience-card h3 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  line-height: 1.4;
}

/* ============================================
   TECHNOLOGIES
   ============================================ */
.technologies {
  background: var(--color-bg);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 700px;
  margin: 0 auto;
}

.tech-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.tech-item:hover {
  border-color: var(--color-secondary);
  background: var(--color-bg-blue);
}

.tech-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-secondary);
  flex-shrink: 0;
}

.tech-item span {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  background: var(--color-bg);
  padding: var(--space-3xl) 0;
}

.cta-inner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, #0B7285 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-4xl) var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-inner::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -5%;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-content h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: white;
  margin-bottom: var(--space-md);
  line-height: var(--line-height-tight);
}

.cta-content p {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   CONTACTS
   ============================================ */
.contacts {
  background: var(--color-bg-alt);
}

.contacts-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contacts-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.contact-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-blue);
  border-radius: var(--radius-md);
}

.contact-item strong {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: 2px;
}

.contact-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Contact Form */
.contact-form {
  background: var(--color-bg);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.1);
}

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

.form-note {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
  font-weight: var(--font-weight-medium);
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: rgba(23, 162, 166, 0.08);
  border-radius: var(--radius-md);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo .logo-text {
  color: white;
}

.footer-desc {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-top: var(--space-md);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: white;
  margin-bottom: var(--space-md);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links li {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

.footer-links a {
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.4);
}

.footer-made {
  font-style: italic;
}

/* ============================================
   FADE-IN ANIMATION
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays for cards */
.fade-in:nth-child(1) { transition-delay: 0s; }
.fade-in:nth-child(2) { transition-delay: 0.08s; }
.fade-in:nth-child(3) { transition-delay: 0.16s; }
.fade-in:nth-child(4) { transition-delay: 0.24s; }
.fade-in:nth-child(5) { transition-delay: 0.32s; }
.fade-in:nth-child(6) { transition-delay: 0.4s; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --font-size-4xl: 2.2rem;
    --font-size-3xl: 1.75rem;
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    order: 1;
  }

  .hero-visual {
    order: 2;
    max-width: 450px;
    margin: 0 auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-tagline {
    margin-left: auto;
    margin-right: auto;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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

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

  .arch-features {
    grid-template-columns: 1fr;
  }

  .audience-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .contacts-layout {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.85rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
    --space-4xl: 4rem;
    --header-height: 64px;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: var(--space-lg);
    transform: translateY(-120%);
    transition: transform var(--transition-base);
    z-index: 999;
  }

  .nav.open {
    transform: translateY(0);
  }

  .nav-links {
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav-links a {
    font-size: var(--font-size-base);
    padding: var(--space-sm) 0;
    display: block;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .header-cta {
    display: none;
  }

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

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

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

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

  .cta-inner {
    padding: var(--space-3xl) var(--space-xl);
  }

  .cta-content h2 {
    font-size: var(--font-size-2xl);
  }

  .steps::before {
    left: 27px;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-4xl: 1.6rem;
    --font-size-3xl: 1.35rem;
    --container-padding: 1rem;
    --space-4xl: 3rem;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-buttons .btn {
    text-align: center;
  }
}