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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #111827;
  background: #f9fafb;
  line-height: 1.5;
}

/* Layout helpers */
.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navbar */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(249, 250, 251, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e5e7eb;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.3rem;
  color: #2563eb;
}

.nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: #4b5563;
  font-size: 0.95rem;
}

.nav a:hover {
  color: #111827;
}

/* Hero */
.hero {
  padding: 3.5rem 0 3rem;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.hero-text {
  flex: 1 1 280px;
}

.hero-text h1 {
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin-bottom: 1rem;
}

.hero-text p {
  color: #4b5563;
  margin-bottom: 1.5rem;
}

.hero-note {
  font-size: 0.85rem;
  color: #6b7280;
}

.hero-buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.2s, color 0.2s, transform 0.1s, box-shadow 0.1s;
}

.btn.primary {
  background: #2563eb;
  color: white;
  box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.2);
}

.btn.primary:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.btn.secondary {
  background: white;
  color: #111827;
  border-color: #e5e7eb;
}

.btn.secondary:hover {
  background: #f3f4f6;
}

/* Hero image placeholder */
.hero-image {
  flex: 1 1 220px;
  display: flex;
  justify-content: center;
}

.phone-placeholder {
  width: 220px;
  height: 420px;
  border-radius: 32px;
  background: linear-gradient(145deg, #eff6ff, #dbeafe);
  border: 1px solid #bfdbfe;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1d4ed8;
  font-weight: 600;
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section h2 {
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  text-align: center;
  color: #6b7280;
  margin-bottom: 2rem;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: white;
  border-radius: 0.75rem;
  padding: 1.5rem;
  border: 1px solid #e5e7eb;
  box-shadow: 0 4px 8px -4px rgba(15, 23, 42, 0.08);
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.feature-card p {
  color: #4b5563;
  font-size: 0.95rem;
}

/* Download section */
.download {
  background: #111827;
  color: white;
}

.download .section-subtitle {
  color: #d1d5db;
}

.store-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.store-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: 0.75rem;
  background: white;
  color: #111827;
  text-decoration: none;
  min-width: 170px;
  text-align: left;
}

.store-small {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: #6b7280;
}

.store-big {
  font-size: 1.05rem;
  font-weight: 600;
}

/* Contact */
.contact p {
  text-align: center;
  color: #4b5563;
}

.contact a {
  color: #2563eb;
  text-decoration: none;
}

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

/* Footer */
.footer {
  border-top: 1px solid #e5e7eb;
  padding: 1.5rem 0;
  background: #f9fafb;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #6b7280;
}

.footer-links {
  display: flex;
  gap: 0.5rem;
}

.footer a {
  color: #6b7280;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* Responsive tweaks */
@media (max-width: 640px) {
  .nav-content nav a {
    margin-left: 0.75rem;
    font-size: 0.85rem;
  }

  .hero {
    padding-top: 2.4rem;
  }

  .hero-content {
    gap: 2rem;
  }

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