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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  background: #0f1419;
  color: #e6edf3;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: #00d4aa;
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #33e0be;
}

a:focus-visible {
  outline: 2px solid #00d4aa;
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---- Layout ---- */

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

section + section {
  border-top: 1px solid #1e2a35;
}

/* ---- Nav ---- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid #1e2a35;
  padding: 0.75rem 0;
}

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

.nav-brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: #e6edf3;
  letter-spacing: -0.02em;
}

.nav-brand span {
  color: #00d4aa;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  color: #8b949e;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #e6edf3;
}

/* ---- Hero ---- */

.hero {
  padding: 7rem 0 5rem;
  text-align: center;
}

.hero h1 {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero h1 span {
  color: #00d4aa;
}

.hero .tagline {
  font-size: 1.25rem;
  color: #8b949e;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero .description {
  max-width: 640px;
  margin: 0 auto 2.5rem;
  color: #b1bac4;
  font-size: 1.0625rem;
  line-height: 1.7;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #00d4aa;
  color: #0f1419;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.8rem 2rem;
  border-radius: 8px;
  transition: background 0.2s, transform 0.15s;
}

.hero-cta:hover {
  background: #00e8ba;
  color: #0f1419;
  transform: translateY(-1px);
}

.hero-cta:active {
  transform: translateY(0);
}

.hero-meta {
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  color: #6e7681;
}

/* ---- Features ---- */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.feature-card {
  background: #161b22;
  border: 1px solid #1e2a35;
  border-radius: 10px;
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: #00d4aa40;
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  display: block;
  line-height: 1;
  color: #00d4aa;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #e6edf3;
}

.feature-card p {
  font-size: 0.875rem;
  color: #8b949e;
  line-height: 1.6;
}

/* ---- Section Headers ---- */

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #00d4aa;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-subtitle {
  color: #8b949e;
  margin-top: 0.75rem;
  max-width: 560px;
  font-size: 1.0625rem;
}

/* ---- Screenshots ---- */

.screenshots-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.screenshot-placeholder {
  background: #161b22;
  border: 1px dashed #2d3843;
  border-radius: 10px;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #484f58;
  font-size: 0.875rem;
  font-weight: 500;
}

/* ---- Download ---- */

.download-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  margin-top: 2.5rem;
  align-items: start;
}

.download-primary .btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #00d4aa;
  color: #0f1419;
  font-weight: 700;
  font-size: 1.0625rem;
  padding: 0.9rem 2.25rem;
  border-radius: 8px;
  transition: background 0.2s, transform 0.15s;
}

.download-primary .btn-download:hover {
  background: #00e8ba;
  color: #0f1419;
  transform: translateY(-1px);
}

.download-primary .btn-download:active {
  transform: translateY(0);
}

.sys-requirements {
  margin-top: 1.5rem;
}

.sys-requirements h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #8b949e;
  margin-bottom: 0.625rem;
}

.sys-requirements ul {
  list-style: none;
  font-size: 0.875rem;
  color: #8b949e;
}

.sys-requirements li {
  padding: 0.25rem 0;
}

.sys-requirements li::before {
  content: "\2013\00a0";
  color: #484f58;
}

.smartscreen-note {
  background: #1c2128;
  border: 1px solid #2d3843;
  border-radius: 10px;
  padding: 1.5rem;
}

.smartscreen-note h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #e6edf3;
  margin-bottom: 0.75rem;
}

.smartscreen-note p {
  font-size: 0.875rem;
  color: #8b949e;
  line-height: 1.7;
}

.smartscreen-steps {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: #b1bac4;
  font-weight: 600;
}

/* ---- Footer ---- */

.site-footer {
  border-top: 1px solid #1e2a35;
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: #6e7681;
}

.footer-inner a {
  color: #8b949e;
}

.footer-inner a:hover {
  color: #00d4aa;
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
  section {
    padding: 3.5rem 0;
  }

  .hero {
    padding: 4.5rem 0 3.5rem;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero .tagline {
    font-size: 1.0625rem;
  }

  .hero .description {
    font-size: 0.9375rem;
  }

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

  .screenshots-row {
    grid-template-columns: 1fr;
  }

  .download-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    font-size: 0.8125rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.875rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}