/* ========================================
   Privee AI - Global Styles
   ======================================== */

:root {
  --color-primary: #050507;
  --color-secondary: #060607;
  --color-accent-light: #d2c5d5;
  --color-accent-purple: #652594;
  --color-accent-teal: #6bacc0;
  --color-white: #ffffff;
  --color-gray-100: #f7f7f8;
  --color-gray-200: #e8e8ec;
  --color-gray-300: #c9c9d0;
  --color-gray-400: #9e9ea8;
  --color-gray-500: #6e6e7a;
  --color-gray-600: #44444d;
  --color-gray-700: #2a2a32;
  --color-gray-800: #18181c;
  --color-gray-900: #0e0e11;
  --gradient-purple: linear-gradient(135deg, #652594, #8b3cc7);
  --gradient-teal: linear-gradient(135deg, #6bacc0, #4fc3d9);
  --gradient-hero: linear-gradient(160deg, #0a0a12 0%, #1a0e2e 40%, #0d1f2d 100%);
  --gradient-cta: linear-gradient(135deg, #652594 0%, #6bacc0 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(0,0,0,0.18);
  --shadow-glow: 0 0 30px rgba(101,37,148,0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-primary: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-primary);
  color: var(--color-gray-200);
  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-fast);
}

ul, ol {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  color: var(--color-white);
  line-height: 1.3;
  font-weight: 700;
}

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

/* ---- Section Common ---- */
.section {
  padding: 100px 0;
}

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

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-white), var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--color-gray-400);
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-xl);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  line-height: 1.4;
}

.btn-primary {
  background: var(--gradient-purple);
  color: var(--color-white);
  box-shadow: 0 4px 20px rgba(101,37,148,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(101,37,148,0.55);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent-light);
  border: 1.5px solid rgba(210,197,213,0.3);
}

.btn-secondary:hover {
  border-color: var(--color-accent-purple);
  background: rgba(101,37,148,0.1);
  transform: translateY(-2px);
}

.btn-large {
  padding: 18px 44px;
  font-size: 1.15rem;
  border-radius: 32px;
}

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

.navbar.scrolled {
  background: rgba(5,5,7,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
}

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

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

.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-gray-300);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-links a i {
  font-size: 0.85rem;
  color: var(--color-accent-purple);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

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

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid rgba(210,197,213,0.2);
  color: var(--color-gray-300);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  font-family: var(--font-primary);
  transition: all var(--transition-fast);
}

.lang-toggle:hover {
  border-color: var(--color-accent-purple);
  color: var(--color-white);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-gray-800);
  border: 1px solid rgba(210,197,213,0.1);
  border-radius: var(--radius-md);
  padding: 8px 0;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

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

.lang-dropdown a {
  display: block;
  padding: 10px 20px;
  color: var(--color-gray-300);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.lang-dropdown a:hover,
.lang-dropdown a.current {
  background: rgba(101,37,148,0.15);
  color: var(--color-white);
}

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

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5,5,7,0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.mobile-menu.active {
  display: flex;
  opacity: 1;
  visibility: visible;
}

.mobile-menu a {
  color: var(--color-white);
  font-size: 1.4rem;
  font-weight: 600;
}

.mobile-menu .close-menu {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 2rem;
  cursor: pointer;
}

.mobile-lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 16px;
}

.mobile-lang-list a {
  font-size: 0.95rem;
  padding: 8px 16px;
  border: 1px solid rgba(210,197,213,0.2);
  border-radius: var(--radius-sm);
  color: var(--color-gray-300);
  font-weight: 400;
}

.mobile-lang-list a:hover,
.mobile-lang-list a.current {
  border-color: var(--color-accent-purple);
  color: var(--color-white);
}

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

.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(101,37,148,0.15) 0%, transparent 70%);
  top: -100px;
  right: -100px;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(107,172,192,0.1) 0%, transparent 70%);
  bottom: -100px;
  left: -100px;
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(101,37,148,0.2);
  border: 1px solid rgba(101,37,148,0.3);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--color-accent-light);
  margin-bottom: 28px;
}

.hero-badge i {
  color: var(--color-accent-teal);
}

.hero h1 {
  font-size: 3.8rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-gray-400);
  margin-bottom: 40px;
  line-height: 1.8;
}

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

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 60px;
}

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

.hero-stat .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  display: block;
}

.hero-stat .label {
  font-size: 0.85rem;
  color: var(--color-gray-500);
  margin-top: 4px;
}

/* ---- Features ---- */
.features {
  background: var(--color-secondary);
  position: relative;
}

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

.feature-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(210,197,213,0.08);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-purple);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(101,37,148,0.3);
  box-shadow: var(--shadow-glow);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(101,37,148,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
  color: var(--color-accent-purple);
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-gray-400);
  line-height: 1.7;
}

.features-cta {
  text-align: center;
  margin-top: 50px;
}

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

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

.use-case-card {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(210,197,213,0.08);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition-normal);
}

.use-case-card:hover {
  transform: translateY(-4px);
  border-color: rgba(107,172,192,0.3);
  box-shadow: 0 0 30px rgba(107,172,192,0.15);
}

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

.use-case-card:nth-child(1) .use-case-icon {
  background: rgba(101,37,148,0.15);
  color: var(--color-accent-purple);
}

.use-case-card:nth-child(2) .use-case-icon {
  background: rgba(107,172,192,0.15);
  color: var(--color-accent-teal);
}

.use-case-card:nth-child(3) .use-case-icon {
  background: rgba(210,197,213,0.15);
  color: var(--color-accent-light);
}

.use-case-card:nth-child(4) .use-case-icon {
  background: rgba(101,37,148,0.15);
  color: #8b3cc7;
}

.use-case-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.use-case-card p {
  font-size: 0.9rem;
  color: var(--color-gray-400);
  line-height: 1.7;
}

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

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

.pricing-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(210,197,213,0.08);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all var(--transition-normal);
  position: relative;
}

.pricing-card.popular {
  border-color: var(--color-accent-purple);
  box-shadow: var(--shadow-glow);
  transform: scale(1.03);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-purple);
  color: var(--color-white);
  padding: 6px 20px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.pricing-card .price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 4px;
}

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

.pricing-card .price-desc {
  color: var(--color-gray-500);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

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

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(210,197,213,0.06);
  font-size: 0.95rem;
  color: var(--color-gray-300);
}

.pricing-features li i.fa-check {
  color: var(--color-accent-teal);
}

.pricing-features li i.fa-xmark {
  color: var(--color-gray-600);
}

.pricing-features li.disabled {
  color: var(--color-gray-600);
}

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

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

.testimonials-overview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 60px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.testimonial-score {
  text-align: center;
}

.testimonial-score .big-score {
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-white);
}

.testimonial-score .stars {
  color: #fbbf24;
  font-size: 1.2rem;
  margin: 8px 0;
}

.testimonial-score .review-count {
  color: var(--color-gray-400);
  font-size: 0.95rem;
}

.rating-bars {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 260px;
}

.rating-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-gray-400);
}

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

.rating-bar .bar-fill {
  height: 100%;
  background: #fbbf24;
  border-radius: 4px;
  transition: width 1s ease;
}

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

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

.testimonial-card {
  min-width: 100%;
  padding: 0 20px;
  display: flex;
  gap: 24px;
}

.testimonial-card > div {
  flex: 1;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(210,197,213,0.08);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.testimonial-stars {
  color: #fbbf24;
  font-size: 0.9rem;
  margin-bottom: 14px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--color-gray-300);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

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

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: 1rem;
}

.testimonial-info .name {
  font-weight: 600;
  color: var(--color-white);
  font-size: 0.95rem;
}

.testimonial-info .role {
  color: var(--color-gray-500);
  font-size: 0.85rem;
}

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

.slider-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(210,197,213,0.2);
  background: none;
  color: var(--color-gray-300);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.slider-btn:hover {
  border-color: var(--color-accent-purple);
  color: var(--color-white);
  background: rgba(101,37,148,0.15);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 40px;
}

.testimonial-tag {
  background: rgba(101,37,148,0.12);
  border: 1px solid rgba(101,37,148,0.2);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-accent-light);
}

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

.comparison-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(210,197,213,0.08);
}

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

.comparison-table th,
.comparison-table td {
  padding: 18px 24px;
  text-align: center;
  border-bottom: 1px solid rgba(210,197,213,0.06);
  font-size: 0.95rem;
}

.comparison-table thead th {
  background: rgba(101,37,148,0.1);
  color: var(--color-white);
  font-weight: 700;
  font-size: 1rem;
}

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

.comparison-table td:first-child {
  text-align: left;
  color: var(--color-gray-300);
  font-weight: 500;
}

.comparison-table .highlight-col {
  background: rgba(101,37,148,0.08);
}

.comparison-table thead .highlight-col {
  background: rgba(101,37,148,0.2);
  color: var(--color-accent-teal);
}

.comparison-table .check {
  color: var(--color-accent-teal);
  font-size: 1.1rem;
}

.comparison-table .cross {
  color: var(--color-gray-600);
  font-size: 1.1rem;
}

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

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

.faq-item {
  border: 1px solid rgba(210,197,213,0.08);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover,
.faq-item.active {
  border-color: rgba(101,37,148,0.3);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-primary);
  transition: color var(--transition-fast);
}

.faq-question i {
  font-size: 0.9rem;
  color: var(--color-accent-purple);
  transition: transform var(--transition-normal);
  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, padding 0.3s ease;
}

.faq-answer-content {
  padding: 0 24px 20px;
  color: var(--color-gray-400);
  font-size: 0.95rem;
  line-height: 1.8;
}

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

.final-cta::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
  top: -200px;
  right: -100px;
  pointer-events: none;
}

.final-cta h2 {
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 40px;
}

.final-cta .btn-primary {
  background: var(--color-white);
  color: var(--color-accent-purple);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  font-size: 1.15rem;
  padding: 18px 44px;
}

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

/* ---- Footer ---- */
.footer {
  background: var(--color-gray-900);
  padding: 60px 0 30px;
  border-top: 1px solid rgba(210,197,213,0.06);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: start;
  flex-wrap: wrap;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .nav-brand {
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--color-gray-500);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-links-group h4 {
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: var(--color-gray-300);
}

.footer-links-group a {
  display: block;
  color: var(--color-gray-500);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(210,197,213,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: var(--color-gray-600);
  font-size: 0.85rem;
}

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

.footer-bottom-links a {
  color: var(--color-gray-600);
  font-size: 0.85rem;
}

.footer-bottom-links a:hover {
  color: var(--color-gray-300);
}

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-purple);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  box-shadow: 0 4px 16px rgba(101,37,148,0.4);
  z-index: 900;
}

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

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(101,37,148,0.55);
}

/* ---- 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);
  }

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

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

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

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .section {
    padding: 70px 0;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .nav-links {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .hero .subtitle {
    font-size: 1.05rem;
  }

  .hero-stats {
    gap: 24px;
  }

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

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

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

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

  .testimonial-card {
    flex-direction: column;
  }

  .testimonials-overview {
    gap: 30px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 14px 16px;
    font-size: 0.85rem;
  }

  .final-cta h2 {
    font-size: 2rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 30px;
  }

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

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

  .hero-stats {
    flex-direction: row;
    justify-content: space-around;
    gap: 12px;
    width: 100%;
  }

  .hero-stat {
    flex: 1;
    min-width: 0;
  }

  .hero-stat .number {
    font-size: 1.3rem;
  }

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

  .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
  }

  .btn-large {
    padding: 16px 36px;
    font-size: 1.05rem;
  }
}