/* ============================================
   Gening AI — Global Stylesheet
   ============================================ */

:root {
  --color-primary: #cebbb4;
  --color-secondary: #171516;
  --color-accent: #4084ed;
  --color-accent-dark: #33589a;
  --color-bg: #0e0d0d;
  --color-bg-alt: #1a1818;
  --color-bg-card: #222020;
  --color-text: #f0ebe8;
  --color-text-muted: #a09a96;
  --color-border: rgba(206, 187, 180, 0.12);
  --color-glass: rgba(206, 187, 180, 0.06);
  --gradient-primary: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  --gradient-hero: linear-gradient(160deg, #171516 0%, #1a1818 50%, #1f1c1b 100%);
  --gradient-cta: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(64, 132, 237, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-heading: 'Inter', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================
   Animations
   ================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==================
   Header / Navigation
   ================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.site-header.scrolled {
  background: rgba(14, 13, 13, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--color-border);
  padding: 10px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
}

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

.nav-links a i {
  font-size: 0.8rem;
}

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

.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  background: none;
  border: 1px solid var(--color-border);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  font-family: var(--font-body);
}

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

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 0;
  min-width: 160px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition);
  z-index: 100;
}

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

.lang-dropdown a {
  display: block;
  padding: 8px 20px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
  color: var(--color-text);
  background: var(--color-glass);
}

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--gradient-cta);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(64, 132, 237, 0.3);
  text-decoration: none;
  font-family: var(--font-body);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(64, 132, 237, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: transparent;
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-accent);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  font-family: var(--font-body);
}

.btn-secondary:hover {
  background: rgba(64, 132, 237, 0.1);
  transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* ==================
   Hero Section
   ================== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(64, 132, 237, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  animation: pulse 6s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(206, 187, 180, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  animation: pulse 8s ease-in-out infinite 2s;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  animation: fadeInUp 0.8s ease forwards;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--color-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}

.hero-badge i {
  font-size: 0.75rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-buttons .btn-primary {
  padding: 14px 36px;
  font-size: 1rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}

.hero-stat {
  text-align: center;
}

.hero-stat .number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent);
}

.hero-stat .label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ==================
   Section Common Styles
   ================== */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 2.2rem;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section-header p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ==================
   Features Section
   ================== */
.features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: rgba(64, 132, 237, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(64, 132, 237, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: 1.3rem;
  color: var(--color-accent);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.features .section-cta {
  text-align: center;
}

/* ==================
   Use Cases Section
   ================== */
.use-cases {
  background: var(--color-bg-alt);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.use-case-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}

.use-case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.use-case-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin: 0 auto 20px;
  font-size: 1.5rem;
}

.use-case-card:nth-child(1) .use-case-icon {
  background: rgba(64, 132, 237, 0.12);
  color: var(--color-accent);
}
.use-case-card:nth-child(2) .use-case-icon {
  background: rgba(206, 187, 180, 0.15);
  color: var(--color-primary);
}
.use-case-card:nth-child(3) .use-case-icon {
  background: rgba(51, 88, 154, 0.15);
  color: #6ea8ff;
}
.use-case-card:nth-child(4) .use-case-icon {
  background: rgba(166, 132, 237, 0.12);
  color: #a684ed;
}

.use-case-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--color-text);
}

.use-case-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==================
   Pricing Section
   ================== */
.pricing {
  background: var(--color-bg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  transition: all var(--transition);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.pricing-card.popular {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-cta);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: var(--radius-xl);
  white-space: nowrap;
}

.pricing-card .plan-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.pricing-card .plan-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 4px;
}

.pricing-card .plan-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-card .plan-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.pricing-features {
  margin-bottom: 32px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: 8px 0;
}

.pricing-features li i.fa-check {
  color: var(--color-accent);
  font-size: 0.8rem;
}

.pricing-features li i.fa-xmark {
  color: #555;
  font-size: 0.8rem;
}

.pricing-features li.disabled {
  opacity: 0.5;
}

.pricing-card .btn-primary,
.pricing-card .btn-secondary {
  width: 100%;
  justify-content: center;
}

/* ==================
   Testimonials Section
   ================== */
.testimonials {
  background: var(--color-bg-alt);
}

.testimonials-overview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.rating-big {
  text-align: center;
}

.rating-big .score {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-text);
}

.rating-big .stars {
  color: #f5a623;
  font-size: 1.1rem;
  margin: 8px 0;
}

.rating-big .count {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.rating-bars {
  flex: 1;
  max-width: 320px;
}

.rating-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.rating-bar-row span:first-child {
  width: 20px;
  text-align: right;
}

.rating-bar {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
}

.rating-bar-fill {
  height: 100%;
  background: #f5a623;
  border-radius: 4px;
}

.rating-bar-row span:last-child {
  width: 36px;
  text-align: right;
}

.testimonials-carousel {
  position: relative;
  overflow: hidden;
}

.testimonials-track {
  display: flex;
  transition: transform 0.5s ease;
}

.testimonial-card {
  flex: 0 0 calc(33.333% - 16px);
  margin: 0 8px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.testimonial-card .stars {
  color: #f5a623;
  font-size: 0.85rem;
  margin-bottom: 14px;
}

.testimonial-card blockquote {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-cta);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}

.testimonial-author .name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-author .role {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.carousel-btn {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.9rem;
}

.carousel-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 32px;
}

.testimonial-tag {
  padding: 6px 16px;
  background: var(--color-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ==================
   Comparison Section
   ================== */
.comparison {
  background: var(--color-bg);
}

.comparison-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.comparison-table th,
.comparison-table td {
  padding: 16px 24px;
  text-align: center;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table thead th {
  background: var(--color-bg-card);
  font-weight: 600;
  color: var(--color-text);
}

.comparison-table thead th.highlight {
  background: rgba(64, 132, 237, 0.1);
  color: var(--color-accent);
}

.comparison-table tbody td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--color-text);
}

.comparison-table tbody td {
  color: var(--color-text-muted);
}

.comparison-table tbody td.highlight {
  background: rgba(64, 132, 237, 0.04);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table .check {
  color: var(--color-accent);
}

.comparison-table .cross {
  color: #555;
}

/* ==================
   FAQ Section
   ================== */
.faq {
  background: var(--color-bg-alt);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: rgba(64, 132, 237, 0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  background: var(--color-bg-card);
  transition: background var(--transition);
  width: 100%;
  border: none;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-body);
  text-align: left;
}

.faq-question:hover {
  background: rgba(34, 32, 32, 0.8);
}

.faq-question i {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: transform var(--transition);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ==================
   Final CTA Section
   ================== */
.final-cta {
  position: relative;
  padding: 100px 0;
  background: var(--gradient-cta);
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.final-cta .container {
  position: relative;
  z-index: 2;
  text-align: center;
}

.final-cta h2 {
  font-size: 2.5rem;
  color: #fff;
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 36px;
}

.final-cta .btn-cta-big {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 42px;
  background: #fff;
  color: var(--color-accent-dark);
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  text-decoration: none;
  font-family: var(--font-body);
}

.final-cta .btn-cta-big:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

/* ==================
   Footer
   ================== */
.site-footer {
  background: var(--color-secondary);
  padding: 60px 0 30px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 20px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

/* ==================
   Back to Top
   ================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
  font-size: 1rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent-dark);
  transform: translateY(-3px);
}

/* ==================
   Mobile Navigation Overlay
   ================== */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(14, 13, 13, 0.98);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav a {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-nav .close-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 1.8rem;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
}

.mobile-nav .mobile-lang {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  width: 80%;
}

.mobile-nav .mobile-lang a {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

/* ==================
   Responsive Design
   ================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .pricing-card:nth-child(3) {
    grid-column: span 2;
    max-width: 400px;
    justify-self: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .header-inner > .btn-primary,
  .header-inner > .lang-switcher {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    min-height: 70vh;
    padding-top: 80px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-stat .number {
    font-size: 1.4rem;
  }

  section {
    padding: 70px 0;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

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

  .use-cases-grid {
    grid-template-columns: 1fr;
  }

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

  .pricing-card:nth-child(3) {
    grid-column: auto;
    max-width: none;
  }

  .testimonials-overview {
    flex-direction: column;
    gap: 24px;
  }

  .testimonial-card {
    flex: 0 0 calc(100% - 16px);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .final-cta h2 {
    font-size: 1.8rem;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px 14px;
    font-size: 0.82rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    flex-direction: row;
    gap: 20px;
  }

  .hero-stat .number {
    font-size: 1.2rem;
  }

  .hero-stat .label {
    font-size: 0.75rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn-primary,
  .hero-buttons .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}