:root {
  --primary:    #4A90E2;
  --accent:     #50E3C2;
  --dark:       #0F172A;
  --text:       #1E293B;
  --gray:       #64748B;
  --light:      #F8FAFC;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--light);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226,232,240,0.6);
  z-index: 1000;
  padding: 16px 0;
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
}

/* Mobile menu toggle */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 28px;
  height: 3px;
  background: var(--dark);
  border-radius: 2px;
}

/* Nav */
.nav-list {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-list a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-list a:hover {
  color: var(--primary);
}

/* Hero */
.hero {
  padding: 140px 0 160px;
  background: linear-gradient(135deg, var(--dark) 0%, #1e3a8a 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(80,227,194,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: clamp(3.8rem, 9vw, 6rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-text {
  font-size: 1.45rem;
  opacity: 0.92;
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 16px 36px;
  font-size: 1.15rem;
  font-weight: 600;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-primary {
  background: #ffffff;
  color: #0f172a;         
  font-weight: 700;
  border: 2px solid #ffffff;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.35);
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: #f8fafc;
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(15, 23, 42, 0.45);
}

.btn-outline {
  border: 2px solid rgba(255,255,255,0.4);
  color: white;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.15);
}

.hero-image {
  width: 100%;
  max-width: 1100px;
  margin: 60px auto 0;
  border-radius: 24px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.1);
}

/* Features */
.features {
  padding: 120px 0;
  background: white;
}

.features h2 {
  font-size: 3.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
}

.section-lead {
  text-align: center;
  font-size: 1.35rem;
  color: var(--gray);
  max-width: 720px;
  margin: 0 auto 64px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.feature-card {
  background: white;
  border-radius: 20px;
  padding: 40px 32px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.08);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
  transform: translateY(-14px);
  box-shadow: 0 24px 48px rgba(74,144,226,0.25);
}

.feature-icon {
  width: 72px;
  height: 72px;
  margin-bottom: 28px;
}

.feature-icon img {
  width: 100%;
  height: 100%;
  filter: brightness(0) saturate(100%) invert(54%) sepia(81%) saturate(2426%) hue-rotate(188deg) brightness(96%) contrast(101%);
  transition: 0.4s;
}

.feature-card:hover .feature-icon img {
  filter: brightness(0) saturate(100%) invert(67%) sepia(64%) saturate(606%) hue-rotate(128deg) brightness(96%) contrast(91%);
}

.feature-card h3 {
  font-size: 1.65rem;
  margin-bottom: 16px;
}

/* About */
.about {
  padding: 120px 0;
  background: var(--light);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text h2 {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 32px;
}

.about-text p {
  font-size: 1.25rem;
  margin-bottom: 24px;
  color: #475569;
}

.about-image-wrapper {
  max-width: 100%;
  overflow: hidden;
}

.about-image {
  width: 100%;
  height: auto;
  display: block;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);  
  transition: transform 0.3s ease;
}

.about-image:hover {
  transform: scale(1.03);     
}

/* Testimonials */
.testimonials {
  padding: 120px 0;
  background: white;
}

.testimonials h2 {
  font-size: 3.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 64px;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 40px;
}

.testimonial-card {
  position: relative;
  padding: 40px;
  background: white;
  border-radius: 20px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.07);
}

.testimonial-header {
  display: flex;
  align-items: center;
  margin-bottom: 24px;
}

.avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin-right: 20px;
  border: 3px solid var(--accent);
}

.name {
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0;
}

.role {
  color: var(--gray);
  font-size: 1rem;
  margin: 4px 0 0;
}

.testimonial-quote {
  font-size: 1.22rem;
  line-height: 1.7;
  color: #334155;
}

/* CTA */
.cta-section {
  padding: 140px 0;
  background: linear-gradient(135deg, #4a90e2, #3b82f6);
  color: white;
  text-align: center;
}

.cta-section h2 {
  font-size: 3.8rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.cta-section p {
  font-size: 1.45rem;
  max-width: 680px;
  margin: 0 auto 48px;
  opacity: 0.95;
}

.btn-large {
  padding: 22px 56px;
  font-size: 1.35rem;
}

/* Footer */
.footer {
  background: var(--dark);
  color: #94A3B8;
  padding: 80px 0 40px;
}

.footer-logo {
  color: white;
  font-size: 1.9rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.footer-column h4 {
  color: white;
  margin-bottom: 20px;
}

.footer-column a {
  color: #94A3B8;
  text-decoration: none;
  line-height: 2.4;
  display: block;
}

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

/* Mobile */
@media (max-width: 768px) {
  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  }

  .nav-list.active {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

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

  .hero {
    padding: 100px 0 80px;
  }

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

  .hero-buttons {
    flex-direction: column;
  }
}