/* ===== CSS Variables ===== */
:root {
  --color-primary: #07070b;
  --color-secondary: #08070b;
  --color-accent: #d1d2d3;
  --color-blue: #1da4f2;
  --color-muted: #5c758b;
  --color-card: #0f1015;
  --color-card-border: rgba(255, 255, 255, 0.06);
  --color-text: #e4e4e7;
  --color-text-muted: #9ca3af;
  --color-white: #ffffff;
  --gradient-blue: linear-gradient(135deg, #1da4f2, #0d8bd9);
  --gradient-hero: radial-gradient(ellipse at 50% 0%, rgba(29, 164, 242, 0.12) 0%, transparent 60%);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-btn: 0 4px 16px rgba(29, 164, 242, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition: 0.3s 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-body);
  background: var(--color-primary);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

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

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  color: var(--color-white);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 3.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

section {
  padding: 100px 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-blue);
  color: var(--color-white);
  padding: 14px 32px;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(29, 164, 242, 0.45);
}

.btn-secondary {
  background: transparent;
  color: var(--color-blue);
  padding: 14px 32px;
  border: 1.5px solid rgba(29, 164, 242, 0.4);
}

.btn-secondary:hover {
  background: rgba(29, 164, 242, 0.08);
  border-color: var(--color-blue);
}

.btn-sm {
  padding: 10px 24px;
  font-size: 0.9rem;
}

.btn-lg {
  padding: 18px 44px;
  font-size: 1.15rem;
  border-radius: var(--radius-lg);
}

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

.navbar.scrolled {
  background: rgba(7, 7, 11, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-card-border);
  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: 1.2rem;
  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 {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
}

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

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

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

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

.lang-btn {
  background: transparent;
  border: 1px solid var(--color-card-border);
  color: var(--color-text-muted);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
  font-family: var(--font-body);
}

.lang-btn:hover {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.15);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 8px 0;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 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 20px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.lang-dropdown a:hover {
  background: rgba(29, 164, 242, 0.08);
  color: var(--color-white);
}

.lang-dropdown a.active-lang {
  color: var(--color-blue);
}

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

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

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 7, 11, 0.98);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

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

.mobile-nav a {
  font-size: 1.3rem;
  color: var(--color-text);
  transition: color var(--transition);
}

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

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

.mobile-lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 8px;
}

.mobile-lang-list a {
  font-size: 0.9rem;
  padding: 6px 14px;
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
}

.mobile-lang-list a.active-lang {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  pointer-events: none;
}

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

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: var(--color-white);
}

.hero h1 span {
  background: var(--gradient-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

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

.hero-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: rgba(29, 164, 242, 0.06);
  filter: blur(100px);
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

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

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

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

.feature-card:hover {
  border-color: rgba(29, 164, 242, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  background: rgba(29, 164, 242, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.3rem;
  color: var(--color-blue);
}

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

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

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

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

.use-case-card {
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  transition: all var(--transition);
}

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

.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(29, 164, 242, 0.12);
  color: #1da4f2;
}
.use-case-card:nth-child(2) .use-case-icon {
  background: rgba(168, 85, 247, 0.12);
  color: #a855f7;
}
.use-case-card:nth-child(3) .use-case-icon {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
}
.use-case-card:nth-child(4) .use-case-icon {
  background: rgba(251, 191, 36, 0.12);
  color: #fbbf24;
}

.use-case-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 10px;
}

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

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

.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-card-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  transition: all var(--transition);
}

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

.pricing-card.popular {
  border-color: var(--color-blue);
  box-shadow: 0 0 40px rgba(29, 164, 242, 0.1);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-blue);
  color: var(--color-white);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 18px;
  border-radius: 20px;
  white-space: nowrap;
}

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

.pricing-card .price {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 4px;
}

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

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

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--color-text);
}

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

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

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

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

/* ===== Testimonials ===== */
.testimonials-header {
  text-align: center;
  margin-bottom: 3rem;
}

.rating-overview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 8px;
}

.rating-score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-white);
}

.rating-stars {
  color: #fbbf24;
  font-size: 1.2rem;
  display: flex;
  gap: 3px;
}

.rating-count {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

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

.testimonials-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s ease;
}

.testimonial-card {
  min-width: calc(33.333% - 16px);
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 32px;
  flex-shrink: 0;
}

.testimonial-card .stars {
  color: #fbbf24;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.testimonial-card blockquote {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

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

.testimonial-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(29, 164, 242, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-blue);
  font-weight: 700;
  font-size: 1rem;
}

.testimonial-author .name {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-white);
}

.testimonial-author .role {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 3rem;
}

.testimonial-tag {
  background: rgba(29, 164, 242, 0.08);
  color: var(--color-blue);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
}

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

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

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

.comparison-table th,
.comparison-table td {
  padding: 18px 24px;
  text-align: center;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--color-card-border);
}

.comparison-table thead th {
  background: var(--color-card);
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.95rem;
}

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

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

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

.comparison-table .highlight {
  background: rgba(29, 164, 242, 0.04);
}

.comparison-table thead .highlight {
  background: rgba(29, 164, 242, 0.1);
  color: var(--color-blue);
}

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

.comparison-table .fa-xmark {
  color: var(--color-muted);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item.active {
  border-color: rgba(29, 164, 242, 0.2);
}

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

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

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

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

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

/* ===== Final CTA ===== */
.final-cta {
  background: linear-gradient(135deg, rgba(29, 164, 242, 0.12), rgba(29, 164, 242, 0.03));
  border-top: 1px solid var(--color-card-border);
  border-bottom: 1px solid var(--color-card-border);
  text-align: center;
  padding: 100px 0;
}

.final-cta h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 1rem;
}

.final-cta p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
}

/* ===== Footer ===== */
.footer {
  padding: 60px 0 32px;
  border-top: 1px solid var(--color-card-border);
}

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

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

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

.footer-brand p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 60px;
}

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

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

.footer-col a:hover {
  color: var(--color-blue);
}

.footer-bottom {
  border-top: 1px solid var(--color-card-border);
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-muted);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-blue);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(29, 164, 242, 0.3);
  z-index: 100;
}

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

.back-to-top:hover {
  transform: translateY(-3px);
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== 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);
  }
  .testimonial-card {
    min-width: calc(50% - 12px);
  }
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.8rem;
  }

  section {
    padding: 70px 0;
  }

  .nav-links {
    display: none;
  }

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

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .hero {
    padding: 130px 0 70px;
  }

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

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

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

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
  }

  .testimonial-card {
    min-width: 100%;
  }

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

  .footer-links {
    gap: 32px;
    flex-wrap: wrap;
  }

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

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

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

  .pricing-card {
    padding: 32px 24px;
  }

  .btn-lg {
    padding: 16px 32px;
    font-size: 1rem;
  }
}