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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #06b6d4;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-light: #64748b;
  --text-white: #f1f5f9;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: var(--transition);
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  box-shadow: 0 1px 0 var(--border);
}

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

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 2px;
}

.logo-icon {
  font-size: 1.5rem;
  margin-right: 4px;
}

.logo-highlight {
  color: var(--primary);
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  transition: color var(--transition);
}

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

.lang-toggle {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.lang-toggle:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
  border-radius: 2px;
}

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

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

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

/* ===== Hero ===== */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}

.hero-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 60px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--text);
  transform: translateY(-1px);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -1px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== Sections ===== */
section {
  padding: 100px 0;
}

section h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-desc {
  text-align: center;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto 56px;
  font-size: 1.05rem;
}

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

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

.feature-card {
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

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

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

/* ===== Modules ===== */
.modules {
  background: var(--bg-alt);
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.module-card {
  background: var(--bg);
  padding: 24px;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.module-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--primary);
}

.module-icon {
  font-size: 1.8rem;
  display: block;
  margin-bottom: 10px;
}

.module-card h4 {
  font-size: 0.88rem;
  font-weight: 600;
}

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

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

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

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

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  padding: 4px 20px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
  letter-spacing: -1px;
}

.price span {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-light);
}

.pricing-note {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 24px;
}

.pricing-card ul {
  list-style: none;
  text-align: left;
  margin-bottom: 28px;
}

.pricing-card li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-light);
  border-bottom: 1px solid var(--border);
}

.pricing-card li::before {
  content: "✓ ";
  color: var(--primary);
  font-weight: 700;
}

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

/* ===== Contact ===== */
.contact {
  background: var(--bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.contact-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item a {
  color: var(--primary);
  font-weight: 500;
}

.contact-item a:hover {
  text-decoration: underline;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color var(--transition);
  background: var(--bg);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.contact-form textarea {
  resize: vertical;
  min-height: 100px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: var(--text-white);
  padding: 48px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.footer-brand p {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-top: 6px;
}

.footer-brand .logo {
  color: var(--text-white);
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-light);
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .modules-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .pricing-card.featured {
    transform: none;
  }

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

  .hero-stats {
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: flex;
  }

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

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

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

  .hero-actions {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

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

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

  section {
    padding: 64px 0;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}