@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&display=swap');

:root {
  --color-primary: #1d1a1e;
  --color-secondary: #1f1b1f;
  --color-accent: #c45c9f;
  --color-accent2: #763fbe;
  --color-accent3: #78a88a;
  --color-bg: #0f0d10;
  --color-surface: #1d1a1e;
  --color-surface-alt: #2a2630;
  --color-text: #eee8f0;
  --color-text-secondary: #a89db5;
  --color-border: rgba(196, 92, 159, 0.15);
  --color-glass: rgba(31, 27, 31, 0.65);
  --gradient-accent: linear-gradient(135deg, #c45c9f, #763fbe);
  --gradient-hero: linear-gradient(160deg, #1d1a1e 0%, #2a1f35 50%, #1d1a1e 100%);
  --gradient-cta: linear-gradient(135deg, #c45c9f 0%, #763fbe 50%, #78a88a 100%);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(196, 92, 159, 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);
}

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

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

body {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

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: var(--transition);
  background: transparent;
}

.header.scrolled {
  background: rgba(15, 13, 16, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}

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

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
}

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

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

.nav-menu a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}

.nav-menu a:hover {
  color: 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-btn {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-family: inherit;
  transition: var(--transition);
}

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

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

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

.lang-dropdown a {
  display: block;
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.lang-dropdown a:hover {
  background: rgba(196, 92, 159, 0.1);
  color: var(--color-accent);
}

.lang-dropdown a.active {
  color: var(--color-accent);
  font-weight: 600;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(196, 92, 159, 0.35);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xl);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.btn-secondary:hover {
  background: rgba(196, 92, 159, 0.1);
  transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
}

/* Hero */
.hero {
  position: relative;
  padding: 140px 0 80px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(196, 92, 159, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(118, 63, 190, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  position: relative;
  text-align: center;
  max-width: 800px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #c45c9f 50%, #763fbe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero .btn-primary {
  padding: 14px 36px;
  font-size: 1.05rem;
}

/* Section Common */
.section {
  padding: 80px 0;
}

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

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
  font-size: 1rem;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.feature-card {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(196, 92, 159, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(196, 92, 159, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.2rem;
  color: var(--color-accent);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

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

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

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

.usecase-card {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}

.usecase-card:hover {
  transform: translateY(-4px);
  border-color: rgba(196, 92, 159, 0.3);
}

.usecase-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.3rem;
  color: #fff;
}

.usecase-card:nth-child(1) .usecase-icon { background: linear-gradient(135deg, #c45c9f, #e07ab8); }
.usecase-card:nth-child(2) .usecase-icon { background: linear-gradient(135deg, #763fbe, #9b6dd6); }
.usecase-card:nth-child(3) .usecase-icon { background: linear-gradient(135deg, #78a88a, #93c5a3); }
.usecase-card:nth-child(4) .usecase-icon { background: linear-gradient(135deg, #c45c9f, #763fbe); }

.usecase-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.usecase-card p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  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-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
}

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

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

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-accent);
  color: #fff;
  padding: 4px 20px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 4px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pricing-price span {
  font-size: 0.9rem;
  font-weight: 400;
  -webkit-text-fill-color: var(--color-text-secondary);
}

.pricing-desc {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: 24px;
}

.pricing-features {
  text-align: left;
  margin-bottom: 28px;
}

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

.pricing-features li i.fa-check {
  color: var(--color-accent3);
}

.pricing-features li i.fa-xmark {
  color: #666;
}

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

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

/* Testimonials */
.testimonials-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

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

.rating-score {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.rating-stars {
  color: #f5a623;
  font-size: 1.1rem;
  margin: 4px 0;
}

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

.testimonials-slider {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.testimonial-card {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: rgba(196, 92, 159, 0.3);
}

.testimonial-stars {
  color: #f5a623;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
  font-style: italic;
}

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

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

.testimonial-name {
  font-weight: 600;
  font-size: 0.9rem;
}

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

.testimonial-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.testimonial-tag {
  background: rgba(196, 92, 159, 0.1);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
}

/* Comparison */
.comparison-table-wrapper {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--color-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.comparison-table thead th {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

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

.comparison-table thead th.highlight {
  background: rgba(196, 92, 159, 0.15);
  color: var(--color-accent);
}

.comparison-table tbody td {
  padding: 14px 24px;
  font-size: 0.9rem;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--color-text-secondary);
}

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

.comparison-table tbody td.highlight {
  background: rgba(196, 92, 159, 0.05);
}

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

.comparison-table .check {
  color: var(--color-accent3);
  font-size: 1rem;
}

.comparison-table .cross {
  color: #666;
  font-size: 1rem;
}

/* FAQ */
.faq-list {
  max-width: 768px;
  margin: 0 auto;
}

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

.faq-item:hover {
  border-color: rgba(196, 92, 159, 0.25);
}

.faq-question {
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: inherit;
  transition: var(--transition);
}

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

.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 18px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Final CTA */
.final-cta {
  padding: 80px 0;
  background: var(--gradient-cta);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}

.final-cta .container {
  position: relative;
}

.final-cta h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.final-cta p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
}

.final-cta .btn-primary {
  padding: 16px 40px;
  font-size: 1.1rem;
  background: #fff;
  color: var(--color-accent);
}

.final-cta .btn-primary:hover {
  box-shadow: 0 8px 30px rgba(255, 255, 255, 0.3);
}

/* Footer */
.footer {
  background: var(--color-primary);
  border-top: 1px solid var(--color-border);
  padding: 48px 0 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.footer-desc {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copyright {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

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

.footer-legal a {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

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

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(196, 92, 159, 0.3);
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-4px);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Mobile Menu Overlay */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: rgba(15, 13, 16, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-nav.active {
  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 a:hover {
  color: var(--color-accent);
}

.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.6rem;
  cursor: pointer;
}

.mobile-nav .lang-mobile {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.mobile-nav .lang-mobile a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-secondary);
}

/* 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:last-child {
    grid-column: span 2;
    max-width: 400px;
    margin: 0 auto;
  }
  .testimonials-slider {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonial-card:last-child {
    grid-column: span 2;
    max-width: 400px;
    margin: 0 auto;
  }
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .lang-switcher {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero {
    padding: 120px 0 60px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .usecases-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card:last-child {
    grid-column: auto;
    max-width: none;
  }
  .testimonials-slider {
    grid-template-columns: 1fr;
  }
  .testimonial-card:last-child {
    grid-column: auto;
    max-width: none;
  }
  .comparison-table thead th,
  .comparison-table tbody td {
    padding: 12px 14px;
    font-size: 0.8rem;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .final-cta h2 {
    font-size: 1.6rem;
  }
}