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

:root {
  --primary: #4f8cff;
  --primary-dark: #3a6fd8;
  --primary-light: #e8f0ff;
  --secondary: #6c5ce7;
  --accent: #00d2d3;
  --dark: #1a1a2e;
  --dark-2: #16213e;
  --gray-900: #212529;
  --gray-700: #495057;
  --gray-500: #6c757d;
  --gray-300: #dee2e6;
  --gray-100: #f8f9fa;
  --white: #ffffff;
  --gradient: linear-gradient(135deg, #4f8cff 0%, #6c5ce7 100%);
  --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--gray-700);
  line-height: 1.6;
  background: var(--white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

img {
  max-width: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient);
  color: var(--white);
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(79, 140, 255, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(79, 140, 255, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
}

.btn-outline-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.4);
  padding: 8px 20px;
  font-size: 14px;
}
.btn-outline-light:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--white);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
  border-radius: var(--radius);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

.btn-download {
  background: rgba(255,255,255,0.1);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 14px 28px;
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
}
.btn-download:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.5);
  transform: translateY(-3px);
}
.btn-download i {
  font-size: 28px;
}
.btn-download div {
  text-align: left;
  line-height: 1.3;
}
.btn-download small {
  font-size: 12px;
  opacity: 0.8;
  font-weight: 400;
}
.btn-download strong {
  font-size: 15px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.header.scrolled {
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.logo-img {
  height: 36px;
  width: auto;
  display: block;
}

.nav {
  display: flex;
  gap: 32px;
}
.nav-link {
  color: rgba(255,255,255,0.8);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
  border-radius: 2px;
}
.nav-link:hover,
.nav-link.active {
  color: var(--white);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  gap: 12px;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}
.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-dark);
  z-index: 0;
}
.hero-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(79,140,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-bg::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108,92,231,0.12) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-title-highlight {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 17px;
  color: rgba(255,255,255,0.7);
  line-height: 1.8;
  margin-bottom: 24px;
}

.hero-features {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}
.hero-feature-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(79,140,255,0.15);
  border: 1px solid rgba(79,140,255,0.3);
  border-radius: 20px;
  color: rgba(255,255,255,0.9);
  font-size: 13px;
  font-weight: 500;
}
.hero-feature-tag i {
  color: var(--primary);
  font-size: 12px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
}
.hero-stat {
  text-align: center;
}
.hero-stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--white);
}
.hero-stat-plus {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}
.hero-stat-label {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}

/* Hero Mockup */
.hero-mockup {
  perspective: 1000px;
}
.mockup-window {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  transform: rotateY(-5deg) rotateX(2deg);
  transition: transform 0.5s ease;
}
.mockup-window:hover {
  transform: rotateY(0) rotateX(0);
}
.mockup-titlebar {
  display: flex;
  gap: 8px;
  padding: 14px 18px;
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-300);
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.mockup-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chat-bubble {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.chat-bubble.right {
  justify-content: flex-end;
}
.chat-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}
.chat-bubble.right .chat-avatar {
  background: linear-gradient(135deg, #34d399, #059669);
}
.chat-msg {
  max-width: 280px;
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.chat-bubble.right .chat-msg {
  background: var(--primary-light);
}
.chat-original {
  font-size: 14px;
  color: var(--gray-900);
  margin-bottom: 6px;
}
.chat-translated {
  font-size: 12px;
  color: var(--primary);
  padding-top: 6px;
  border-top: 1px dashed var(--gray-300);
}
.chat-translated i {
  margin-right: 4px;
}

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  z-index: 2;
}
.hero-wave svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 12px;
}
.section-desc {
  font-size: 16px;
  color: var(--gray-500);
  max-width: 500px;
  margin: 0 auto;
}

/* ===== Advantages ===== */
.advantages {
  padding: 100px 0;
  background: var(--white);
}
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.advantage-card {
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(30px);
}
.advantage-card.visible {
  opacity: 1;
  transform: translateY(0);
}
.advantage-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}
.advantage-card.visible:hover {
  transform: translateY(-5px);
}
.advantage-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  background: var(--primary-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary);
  transition: var(--transition);
}
.advantage-card:hover .advantage-icon {
  background: var(--gradient);
  color: var(--white);
}
.advantage-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}
.advantage-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ===== Features ===== */
.features {
  padding: 80px 0;
  background: var(--gray-100);
}
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 100px;
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.feature-row.reverse {
  transform: translateX(40px);
}
.feature-row.visible {
  opacity: 1;
  transform: translateX(0);
}
.feature-row:last-child {
  margin-bottom: 0;
}
.feature-row.reverse .feature-text {
  order: 2;
}
.feature-row.reverse .feature-visual {
  order: 1;
}

.feature-badge {
  display: inline-block;
  padding: 4px 14px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}
.feature-text h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.3;
  margin-bottom: 16px;
}
.feature-text p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: 24px;
}
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--gray-700);
}
.feature-list li i {
  color: var(--primary);
  font-size: 14px;
}

/* Feature Visuals */
.feature-card-visual {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-300);
}

/* Translate Demo */
.lang-pair {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 24px;
}
.lang-box {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  color: var(--gray-900);
}
.lang-flag {
  font-size: 20px;
}
.lang-pair i {
  color: var(--primary);
  font-size: 18px;
}
.translate-lines {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.translate-line {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  font-size: 14px;
}
.tl-src {
  color: var(--gray-900);
  font-weight: 500;
  flex: 1;
}
.tl-arrow {
  color: var(--primary);
  font-weight: 700;
}
.tl-dst {
  color: var(--primary);
  font-weight: 500;
  flex: 1;
  text-align: right;
}

/* Marketing Demo */
.marketing-stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.marketing-stat-box {
  text-align: center;
  padding: 20px;
  background: var(--primary-light);
  border-radius: var(--radius);
}
.marketing-stat-box i {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 8px;
}
.ms-num {
  display: block;
  font-size: 24px;
  font-weight: 800;
  color: var(--gray-900);
}
.ms-label {
  display: block;
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 4px;
}
.marketing-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.bar-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  min-width: 60px;
}
.bar-track {
  flex: 1;
  height: 8px;
  background: var(--gray-300);
  border-radius: 4px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: var(--gradient);
  border-radius: 4px;
  transition: width 1s ease;
}
.bar-val {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  min-width: 40px;
  text-align: right;
}

/* Team Demo */
.team-demo {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.team-member {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.team-member:hover {
  background: var(--primary-light);
}
.tm-avatar {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}
.tm-info {
  flex: 1;
}
.tm-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-900);
}
.tm-role {
  font-size: 12px;
  color: var(--gray-500);
}
.tm-status {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 12px;
}
.tm-status.online {
  background: #d1fae5;
  color: #059669;
}
.tm-status.offline {
  background: var(--gray-300);
  color: var(--gray-500);
}

/* CRM Demo */
.crm-demo {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.crm-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.crm-row:hover {
  background: var(--primary-light);
}
.crm-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
  text-transform: uppercase;
}
.crm-tag.vip {
  background: #fef3c7;
  color: #d97706;
}
.crm-tag.new {
  background: #dbeafe;
  color: #2563eb;
}
.crm-tag.active {
  background: #d1fae5;
  color: #059669;
}
.crm-name {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-900);
}
.crm-source {
  font-size: 12px;
  color: var(--gray-500);
  padding: 3px 10px;
  background: var(--white);
  border-radius: 8px;
  border: 1px solid var(--gray-300);
}

/* ===== Platforms ===== */
.platforms {
  padding: 80px 0;
  background: var(--white);
}
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
.platform-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 16px;
  background: var(--gray-100);
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: var(--transition);
  cursor: default;
}
.platform-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-sm);
}
.platform-item i {
  font-size: 36px;
  color: var(--gray-700);
  transition: var(--transition);
}
.platform-item:hover i {
  color: var(--primary);
}
.platform-item span {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
}

/* ===== FAQ ===== */
.faq {
  padding: 100px 0;
  background: var(--gray-100);
}
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-300);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}
.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 2px 12px rgba(79, 140, 255, 0.15);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-900);
  text-align: left;
  font-family: inherit;
  gap: 16px;
  transition: var(--transition);
}
.faq-question:hover {
  color: var(--primary);
}
.faq-question i {
  font-size: 14px;
  color: var(--gray-500);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.faq-item.active .faq-question i {
  transform: rotate(180deg);
  color: var(--primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.active .faq-answer {
  max-height: 300px;
}
.faq-answer p {
  padding: 0 24px 20px;
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.8;
}

/* ===== News ===== */
.news {
  padding: 100px 0;
  background: var(--white);
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  display: block;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-300);
  overflow: hidden;
  transition: var(--transition);
}
.news-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}
.news-img {
  position: relative;
  height: 180px;
  overflow: hidden;
}
.news-img-placeholder {
  width: 100%;
  height: 100%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
}
.news-img-placeholder i {
  font-size: 48px;
  color: rgba(255,255,255,0.3);
}
.news-date {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(0,0,0,0.6);
  color: var(--white);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  backdrop-filter: blur(4px);
}
.news-body {
  padding: 20px;
}
.news-tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  border-radius: 6px;
  margin-bottom: 10px;
}
.news-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card:hover h3 {
  color: var(--primary);
}
.news-body p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== Download ===== */
.download {
  padding: 100px 0;
  background: var(--gradient-dark);
  position: relative;
  overflow: hidden;
}
.download::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79,140,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.download-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}
.download-inner h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 16px;
}
.download-inner p {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}
.download-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ===== Footer ===== */
.footer {
  background: var(--dark);
  padding: 60px 0 0;
  color: rgba(255,255,255,0.6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-top: 16px;
}
.footer-col h4 {
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 12px;
}
.footer-col a:hover {
  color: var(--primary);
}
.footer-contact {
  font-size: 14px;
  margin-top: 8px;
}
.footer-contact i {
  margin-right: 6px;
  color: var(--primary);
}
.footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255,255,255,0.3);
}

/* ===== GPU hints for smooth animations ===== */
.advantage-card,
.feature-row,
.news-card,
.platform-item,
.btn {
  will-change: transform;
}

/* ===== Touch-friendly tap targets (min 44px) ===== */
@media (pointer: coarse) {
  .nav-link {
    padding: 12px 4px;
  }
  .faq-question {
    min-height: 56px;
  }
  .footer-col a {
    padding: 6px 0;
  }
  .platform-item {
    padding: 24px 12px;
  }
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--gradient);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    order: 1;
  }
  .hero-image {
    order: 2;
    max-width: 500px;
    margin: 0 auto;
  }
  .hero-features {
    justify-content: center;
  }
  .hero-buttons {
    justify-content: center;
  }
  .hero-stats {
    justify-content: center;
  }
  .hero-subtitle br {
    display: none;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-row,
  .feature-row.reverse {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .feature-row .feature-text,
  .feature-row.reverse .feature-text {
    order: 1;
  }
  .feature-row .feature-visual,
  .feature-row.reverse .feature-visual {
    order: 2;
  }
  .platforms-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  /* Mobile nav overlay with smooth transition */
  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.98);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    z-index: 998;
    display: flex;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  }
  .nav.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav-link {
    font-size: 18px;
    padding: 12px 24px;
    width: 100%;
    text-align: center;
    border-radius: 8px;
  }
  .nav-link:active {
    background: rgba(79, 140, 255, 0.15);
  }
  .header-actions {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
    z-index: 999;
    padding: 10px;
    -webkit-tap-highlight-color: transparent;
  }

  /* Hero mobile */
  .hero {
    min-height: auto;
    padding-top: 80px;
  }
  .hero-inner {
    padding: 80px 0 60px;
  }
  .hero-title {
    font-size: 30px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .hero-stats {
    gap: 20px;
  }
  .hero-stat-num {
    font-size: 26px;
  }
  .mockup-window {
    transform: none;
  }
  .chat-msg {
    max-width: 220px;
  }

  /* Sections mobile spacing */
  .section-title {
    font-size: 26px;
  }
  .section-desc {
    font-size: 14px;
  }
  .section-header {
    margin-bottom: 40px;
  }
  .advantages {
    padding: 60px 0;
  }
  .features {
    padding: 60px 0;
  }
  .feature-text h2 {
    font-size: 24px;
  }
  .feature-text p {
    font-size: 14px;
  }
  .feature-row {
    margin-bottom: 60px;
  }
  .feature-card-visual {
    padding: 20px;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .advantage-card {
    padding: 24px 20px;
  }
  .platforms {
    padding: 60px 0;
  }
  .platforms-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  .platform-item {
    padding: 20px 8px;
  }
  .platform-item i {
    font-size: 28px;
  }
  .platform-item span {
    font-size: 12px;
  }

  /* FAQ mobile */
  .faq {
    padding: 60px 0;
  }
  .faq-question {
    font-size: 15px;
    padding: 16px 16px;
  }
  .faq-answer p {
    padding: 0 16px 16px;
    font-size: 14px;
  }

  /* News mobile */
  .news {
    padding: 60px 0;
  }
  .news-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .news-img {
    height: 150px;
  }

  /* Download mobile */
  .download {
    padding: 60px 0;
  }
  .download-inner h2 {
    font-size: 24px;
  }
  .download-inner p {
    font-size: 14px;
  }
  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
  .btn-download {
    width: 100%;
    max-width: 320px;
  }

  /* Footer mobile */
  .footer {
    padding: 40px 0 0;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  /* Back to top mobile */
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero-title {
    font-size: 24px;
  }
  .hero-subtitle {
    font-size: 14px;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-buttons .btn {
    justify-content: center;
  }
  .hero-stats {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
  }
  .hero-stat {
    min-width: 80px;
  }
  .hero-feature-tag {
    font-size: 12px;
    padding: 5px 10px;
  }
  .section-title {
    font-size: 22px;
  }
  .feature-text h2 {
    font-size: 22px;
  }
  .advantage-icon {
    width: 48px;
    height: 48px;
    font-size: 20px;
  }
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .marketing-stat-row {
    grid-template-columns: 1fr;
  }
  .lang-pair {
    flex-wrap: wrap;
    gap: 10px;
  }
  .translate-line {
    font-size: 13px;
  }
  .download-inner h2 {
    font-size: 22px;
  }
  .btn-lg {
    padding: 14px 28px;
    font-size: 15px;
  }
}

/* ===== Reduce motion for accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}