@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700&family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --color-primary: #ff6b9d;
  --color-primary-light: #ff8fb3;
  --color-primary-dark: #e84393;
  --color-secondary: #a78bfa;
  --color-accent: #ff6b9d;
  --color-text: #e2e8f0;
  --color-text-light: #94a3b8;
  --color-bg: #0d0d1a;
  --color-bg-alt: #141428;
  --color-bg-dark: #090912;
  --color-border: #2d2d4a;
  --color-card: #1a1a2e;
  --color-hero-start: #0d0d1a;
  --color-hero-end: #1a1a2e;
  --font-primary: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-image: radial-gradient(circle at 50% 0%, rgba(255, 107, 157, 0.03) 0%, transparent 50%);
}

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

img {
  max-width: 100%;
  height: auto;
}

ul {
  list-style: none;
}

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

/* ======== HEADER ======== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
}

.header.scrolled {
  background: rgba(13, 13, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(255, 107, 157, 0.1);
  padding: 10px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.header.scrolled .logo {
  color: #fff;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  transition: all var(--transition);
}

.header.scrolled .nav-links a {
  color: rgba(255, 255, 255, 0.8);
}

.nav-links a:hover {
  background: rgba(255, 107, 157, 0.1);
  color: var(--color-primary);
}

.header.scrolled .nav-links a:hover {
  background: rgba(255, 107, 157, 0.1);
  color: var(--color-primary);
}

.nav-links a i {
  font-size: 0.85rem;
}

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

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

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-primary);
}

.header.scrolled .lang-btn {
  border-color: var(--color-border);
  color: rgba(255, 255, 255, 0.8);
}

.lang-btn:hover {
  background: rgba(255, 107, 157, 0.1);
  border-color: var(--color-primary);
}

.header.scrolled .lang-btn:hover {
  background: rgba(255, 107, 157, 0.1);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: #1a1a2e;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 100;
  overflow: hidden;
}

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

.lang-dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  transition: all var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
  background: rgba(255, 107, 157, 0.08);
  color: var(--color-primary);
}

.lang-dropdown a.active {
  font-weight: 600;
}

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-primary);
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 107, 157, 0.4);
  color: #fff;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-primary);
  white-space: nowrap;
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 107, 157, 0.4);
}

.btn-large {
  padding: 16px 40px;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

.header.scrolled .hamburger span {
  background: #fff;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13, 13, 26, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

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

.mobile-nav a {
  font-size: 1.25rem;
  color: #fff;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.mobile-nav a:hover {
  background: rgba(255, 255, 255, 0.1);
}

.mobile-lang-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.mobile-lang-links a {
  font-size: 0.9rem;
  padding: 8px 16px;
}

/* ======== HERO ======== */
.hero {
  position: relative;
  background: linear-gradient(180deg, #0d0d1a 0%, #141428 100%);
  padding: 140px 0 80px;
  overflow: hidden;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 30%, rgba(255, 107, 157, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 20% 70%, rgba(167, 139, 250, 0.05) 0%, transparent 40%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: linear-gradient(135deg, #ff6b9d, #ff8fb3, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 36px;
  line-height: 1.6;
}

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

.hero .btn-primary {
  background: linear-gradient(135deg, #ff6b9d, #e84393);
  color: #fff;
  font-size: 1rem;
  padding: 14px 32px;
}

.hero .btn-primary:hover {
  box-shadow: 0 8px 28px rgba(255, 107, 157, 0.45);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
}

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

.hero-stat .number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}

.hero-stat .label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.65);
  margin-top: 4px;
}

/* ======== SECTIONS ======== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  text-align: center;
  margin-bottom: 56px;
}

.section-title h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

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

/* ======== FEATURES ======== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(255, 107, 157, 0.12);
  border-color: rgba(255, 107, 157, 0.3);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(255, 107, 157, 0.12), rgba(167, 139, 250, 0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon i {
  font-size: 1.3rem;
  color: var(--color-primary);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.features-cta {
  text-align: center;
  margin-top: 48px;
}

/* ======== USE CASES ======== */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

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

.usecase-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(255, 107, 157, 0.12);
  border-color: rgba(255, 107, 157, 0.3);
}

.usecase-card:nth-child(1) .usecase-icon { background: rgba(255, 107, 157, 0.1); }
.usecase-card:nth-child(2) .usecase-icon { background: rgba(167, 139, 250, 0.1); }
.usecase-card:nth-child(3) .usecase-icon { background: rgba(99, 202, 255, 0.1); }
.usecase-card:nth-child(4) .usecase-icon { background: rgba(250, 204, 21, 0.1); }

.usecase-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.usecase-icon i {
  font-size: 1.5rem;
  color: var(--color-primary);
}

.usecase-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 10px;
}

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

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

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

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
  border-color: var(--color-primary);
  box-shadow: 0 8px 40px rgba(255, 107, 157, 0.2);
  transform: scale(1.04);
}

.pricing-card.popular:hover {
  transform: scale(1.04) translateY(-6px);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #ff6b9d, #e84393);
  color: #fff;
  padding: 4px 20px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-primary);
  margin: 16px 0;
  line-height: 1;
}

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

.pricing-desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

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

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

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

.pricing-features li i.fa-xmark {
  color: #4a4a6a;
  font-size: 0.8rem;
}

.pricing-features li.disabled {
  color: var(--color-text-light);
  opacity: 0.6;
}

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

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

/* ======== TESTIMONIALS ======== */
.testimonials-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

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

.rating-score {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.rating-stars {
  display: flex;
  gap: 4px;
  justify-content: center;
  margin: 8px 0;
}

.rating-stars i {
  color: #ffc107;
  font-size: 1.1rem;
}

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

.rating-bars {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 200px;
}

.rating-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.rating-bar .bar {
  flex: 1;
  height: 6px;
  background: #2d2d4a;
  border-radius: 3px;
  overflow: hidden;
}

.rating-bar .bar-fill {
  height: 100%;
  background: #ffc107;
  border-radius: 3px;
}

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

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

.testimonial-card {
  min-width: calc(33.333% - 16px);
  margin: 0 12px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.testimonial-card .stars {
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
}

.testimonial-card .stars i {
  color: #ffc107;
  font-size: 0.9rem;
}

.testimonial-card .text {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-card .author {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
}

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

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

.carousel-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-card);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--color-text);
  font-size: 0.9rem;
}

.carousel-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(255, 107, 157, 0.3);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
}

.testimonial-tag {
  padding: 6px 16px;
  background: rgba(255, 107, 157, 0.08);
  border: 1px solid rgba(255, 107, 157, 0.2);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 500;
}

/* ======== COMPARISON ======== */
.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

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

.comparison-table th {
  background: #141428;
  font-weight: 600;
  color: var(--color-text);
}

.comparison-table td:first-child,
.comparison-table th:first-child {
  text-align: left;
  font-weight: 500;
}

.comparison-table .highlight {
  background: rgba(255, 107, 157, 0.04);
}

.comparison-table .highlight th {
  background: linear-gradient(135deg, #ff6b9d, #e84393);
  color: #fff;
}

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

.comparison-table .check {
  color: var(--color-primary);
  font-weight: 700;
}

.comparison-table .cross {
  color: #4a4a6a;
}

/* ======== FAQ ======== */
.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: all var(--transition);
}

.faq-item:hover {
  border-color: rgba(255, 107, 157, 0.3);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: #fff;
  font-size: 1rem;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-primary);
  transition: all var(--transition);
}

.faq-question:hover {
  background: rgba(255, 107, 157, 0.04);
}

.faq-question i {
  font-size: 0.85rem;
  transition: transform var(--transition);
  color: var(--color-text-light);
  flex-shrink: 0;
  margin-left: 16px;
}

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

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

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ======== FINAL CTA ======== */
.final-cta {
  background: linear-gradient(135deg, #1a0a1a 0%, #1a1a2e 50%, #0d0d1a 100%);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 50%, rgba(255, 107, 157, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(167, 139, 250, 0.06) 0%, transparent 40%);
  pointer-events: none;
}

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

.final-cta h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 36px;
}

.final-cta .btn-primary {
  background: linear-gradient(135deg, #ff6b9d, #e84393);
  color: #fff;
  font-size: 1.1rem;
  padding: 16px 40px;
}

.final-cta .btn-primary:hover {
  box-shadow: 0 8px 32px rgba(255, 107, 157, 0.5);
}

/* ======== FOOTER ======== */
.footer {
  background: #090912;
  color: rgba(255, 255, 255, 0.55);
  padding: 48px 0 24px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: start;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand {
  max-width: 280px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-links-group h4 {
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links-group a {
  display: block;
  font-size: 0.85rem;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer-links-group a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
}

/* ======== BACK TO TOP ======== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 998;
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(255, 107, 157, 0.4);
}

/* ======== ANIMATIONS ======== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }
.fade-in-delay-5 { transition-delay: 0.5s; }
.fade-in-delay-6 { transition-delay: 0.6s; }

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

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

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

  .pricing-card.popular {
    transform: scale(1);
  }

  .pricing-card.popular:hover {
    transform: translateY(-6px);
  }

  .testimonial-card {
    min-width: calc(50% - 16px);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

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

  .hero-stats {
    flex-direction: row;
    gap: 24px;
    justify-content: center;
  }

  .hero-stat .number {
    font-size: 1.5rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-title h2 {
    font-size: 1.7rem;
  }

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

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .testimonial-card {
    min-width: calc(100% - 24px);
  }

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

  .comparison-table th,
  .comparison-table td {
    padding: 12px 14px;
    font-size: 0.85rem;
  }

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

  .footer-inner {
    flex-direction: column;
  }

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

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }

  .lang-switcher {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.7rem;
  }

  .hero-stats {
    flex-direction: row;
    gap: 16px;
    justify-content: center;
  }

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

  .hero-stat .label {
    font-size: 0.7rem;
  }

  .btn-large {
    padding: 14px 28px;
    font-size: 1rem;
  }
}