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

:root {
  --color-primary: #e8527a;
  --color-primary-dark: #c94466;
  --color-secondary: #d4a24a;
  --color-accent: #e8527a;
  --color-dark: #2d2d3d;
  --color-muted: #7f7f8f;
  --color-white: #ffffff;
  --color-bg: #faf8f9;
  --color-bg-alt: #f5f2f4;
  --color-border: #ede8eb;
  --color-hero-gradient-start: #1c1c2e;
  --color-hero-gradient-end: #151525;
  --color-card-shadow: rgba(232, 82, 122, 0.06);
  --color-card-shadow-hover: rgba(232, 82, 122, 0.14);
  --color-accent-light: rgba(232, 82, 122, 0.08);
  --color-accent-medium: rgba(232, 82, 122, 0.15);
  --color-star: #d4a24a;
  --font-primary: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 8px var(--color-card-shadow);
  --shadow-md: 0 4px 20px var(--color-card-shadow);
  --shadow-lg: 0 8px 40px var(--color-card-shadow);
  --shadow-hover: 0 8px 32px var(--color-card-shadow-hover);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

*, *::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-dark);
  background: var(--color-white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

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

/* ========== Header / Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 20px rgba(232, 82, 122, 0.08);
  padding: 10px 0;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.navbar.scrolled .nav-brand {
  color: var(--color-accent);
}

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

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

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}

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

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

.navbar.scrolled .nav-menu a {
  color: var(--color-dark);
}

.navbar.scrolled .nav-menu a::after {
  background: var(--color-accent);
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

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

.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.9);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--font-primary);
  transition: var(--transition);
}

.lang-switcher-btn:hover {
  border-color: rgba(255, 255, 255, 0.6);
}

.navbar.scrolled .lang-switcher-btn {
  color: var(--color-dark);
  border-color: var(--color-border);
}

.navbar.scrolled .lang-switcher-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

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

.lang-dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--color-dark);
  transition: var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.current {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

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

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 10px 24px;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 82, 122, 0.35);
  color: var(--color-white);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--color-accent);
  padding: 10px 24px;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 0.9rem;
  border: 2px solid var(--color-accent);
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 82, 122, 0.35);
}

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

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: var(--transition);
}

.navbar.scrolled .nav-toggle span {
  background: var(--color-accent);
}

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

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

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

/* ========== Hero Section ========== */
.hero {
  background: linear-gradient(135deg, var(--color-hero-gradient-start) 0%, var(--color-hero-gradient-end) 60%, #0e0e1a 100%);
  padding: 140px 0 100px;
  position: relative;
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232, 82, 122, 0.12) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(212, 162, 74, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--color-primary) 0%, #f0a0b8 100%);
  -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);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

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

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.hero-stat .number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-white);
}

.hero-stat .label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 4px;
}

/* ========== Section Common ========== */
section {
  padding: 90px 0;
}

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

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

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

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
  color: var(--color-accent);
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--color-accent);
  color: var(--color-white);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 10px;
}

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

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

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

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

.use-case-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

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

.use-case-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.5rem;
  color: var(--color-white);
}

.use-case-card:nth-child(1) .use-case-icon { background: var(--color-accent); }
.use-case-card:nth-child(2) .use-case-icon { background: #d4a24a; }
.use-case-card:nth-child(3) .use-case-icon { background: #a86cb5; }
.use-case-card:nth-child(4) .use-case-icon { background: #e87a8e; }

.use-case-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.use-case-card p {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.6;
}

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

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}

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

.pricing-card:hover {
  box-shadow: var(--shadow-hover);
}

.pricing-card.popular {
  border-color: var(--color-accent);
  transform: scale(1.04);
  box-shadow: var(--shadow-lg);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary-dark));
  color: var(--color-white);
  padding: 4px 20px;
  border-radius: var(--radius-xl);
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.pricing-price {
  margin-bottom: 24px;
}

.pricing-price .amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-accent);
}

.pricing-price .period {
  font-size: 0.9rem;
  color: var(--color-muted);
}

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

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

.pricing-features li i {
  font-size: 0.85rem;
  width: 20px;
  text-align: center;
}

.pricing-features li i.fa-check {
  color: #4caf50;
}

.pricing-features li i.fa-xmark {
  color: #ccc;
}

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

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

.testimonials-summary {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

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

.rating-overall .score {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}

.rating-overall .stars {
  color: var(--color-star);
  font-size: 1.2rem;
  margin: 8px 0;
}

.rating-overall .count {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.rating-bars {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 240px;
}

.rating-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
}

.rating-bar .label {
  width: 24px;
  text-align: right;
  color: var(--color-dark);
  font-weight: 500;
}

.rating-bar .bar {
  flex: 1;
  height: 8px;
  background: var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.rating-bar .bar-fill {
  height: 100%;
  background: var(--color-star);
  border-radius: 4px;
  transition: width 0.8s ease;
}

.rating-bar .pct {
  width: 36px;
  font-size: 0.78rem;
  color: var(--color-muted);
}

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

.testimonials-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.testimonial-card {
  min-width: calc(33.333% - 16px);
  margin: 0 8px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), #f0a0b8);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1rem;
}

.testimonial-info h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-dark);
}

.testimonial-info .role {
  font-size: 0.78rem;
  color: var(--color-muted);
}

.testimonial-stars {
  color: var(--color-star);
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.testimonial-card p {
  font-size: 0.9rem;
  color: var(--color-dark);
  line-height: 1.7;
  font-style: italic;
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.testimonial-tags span {
  background: var(--color-accent-light);
  color: var(--color-accent);
  padding: 4px 12px;
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  font-weight: 500;
}

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

.carousel-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 0.9rem;
}

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

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

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.comparison-table thead th {
  background: var(--color-hero-gradient-start);
  color: var(--color-white);
  padding: 18px 24px;
  font-size: 0.92rem;
  font-weight: 600;
  text-align: center;
}

.comparison-table thead th:first-child {
  text-align: left;
}

.comparison-table thead th.highlight {
  background: var(--color-accent);
  position: relative;
}

.comparison-table tbody td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-dark);
}

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

.comparison-table tbody td.highlight {
  background: rgba(232, 82, 122, 0.04);
  font-weight: 600;
  color: var(--color-accent);
}

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

.comparison-table .check {
  color: #4caf50;
  font-weight: 600;
}

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

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

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

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  font-family: var(--font-primary);
  text-align: left;
  transition: var(--transition);
  gap: 16px;
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-question i {
  font-size: 0.85rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  color: var(--color-accent);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ========== Final CTA ========== */
.final-cta {
  background: linear-gradient(135deg, var(--color-hero-gradient-start) 0%, #231530 50%, var(--color-hero-gradient-end) 100%);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(232, 82, 122, 0.1) 0%, transparent 60%);
  border-radius: 50%;
}

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

.final-cta h2 {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 36px;
}

.final-cta .btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 1.1rem;
  padding: 16px 44px;
}

.final-cta .btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232, 82, 122, 0.4);
  color: var(--color-white);
}

/* ========== Footer ========== */
.footer {
  background: #1c1c2e;
  color: rgba(255, 255, 255, 0.6);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-top: 12px;
}

.footer h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 18px;
}

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

.footer-links a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
}

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

/* ========== Back to Top ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: 0 4px 16px rgba(232, 82, 122, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

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

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

.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }
.animate-on-scroll.delay-4 { transition-delay: 0.4s; }
.animate-on-scroll.delay-5 { transition-delay: 0.5s; }

/* ========== Responsive ========== */
@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.popular {
    transform: scale(1);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-hero-gradient-start);
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 998;
  }

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

  .nav-menu a {
    font-size: 1.2rem;
    color: var(--color-white) !important;
  }

  .nav-toggle {
    display: flex;
    z-index: 999;
  }

  .nav-right .btn-primary {
    display: none;
  }

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

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

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }

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

  section {
    padding: 64px 0;
  }

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

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

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

  .testimonial-card {
    min-width: calc(100% - 16px);
  }

  .comparison-table {
    font-size: 0.82rem;
  }

  .comparison-table thead th,
  .comparison-table tbody td {
    padding: 12px 10px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

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

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 120px 0 70px;
    min-height: auto;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .btn-large {
    padding: 14px 32px;
    font-size: 1rem;
  }

  .pricing-card {
    padding: 28px 20px;
  }
}