/* ── Reset & Base ─────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: 'Encode Sans', Arial, Helvetica, sans-serif;
  font-weight: 300;
  color: #1a1a2e;
  background: #fff;
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #2d6cdf;
  text-decoration: none;
  transition: color .2s;
}

a:hover {
  color: #1a4fa0;
}

code {
  font-family: 'Courier New', Courier, monospace;
  background: #f0f2f5;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.9em;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 32px;
}

.accent {
  color: #2d6cdf;
}


/* ── Navigation ──────────────────────────────────────── */

#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}

#navbar.scrolled {
  border-bottom-color: #e8e8ee;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.3em;
  color: #1a1a2e;
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: #1a1a2e;
}

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

.nav-links a {
  color: #555;
  font-weight: 400;
  font-size: 0.92em;
  letter-spacing: 0.01em;
}

.nav-links a:hover {
  color: #1a1a2e;
}


/* ── Hero ────────────────────────────────────────────── */

#hero {
  padding: 160px 0 100px;
  text-align: center;
}

#hero h1 {
  font-size: 4em;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.tagline {
  font-size: 1.5em;
  font-weight: 400;
  color: #333;
  margin-bottom: 12px;
}

.subtitle {
  font-size: 1.05em;
  color: #666;
  max-width: 480px;
  margin: 0 auto 40px;
}

.btn {
  display: inline-block;
  background: #2d6cdf;
  color: #fff;
  padding: 12px 36px;
  border: 1.5px solid #2d6cdf;
  border-radius: 8px;
  font-weight: 500;
  font-size: 1em;
  transition: background .2s, border-color .2s, transform .15s;
}

.btn:hover {
  background: #1a4fa0;
  color: #fff;
  border-color: #1a4fa0;
  transform: translateY(-1px);
}

.btn-large {
  padding: 16px 48px;
  font-size: 1.1em;
}

.btn-secondary {
  background: #4a7fe6;
  border-color: #4a7fe6;
  margin-left: 12px;
}

.btn-secondary:hover {
  background: #1a4fa0;
  border-color: #1a4fa0;
}


/* ── Sections common ─────────────────────────────────── */

section {
  padding: 96px 0;
}

section:nth-child(odd) {
  background: #fafbfc;
}

section h2 {
  font-size: 2em;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 48px;
  text-align: center;
}


/* ── Features grid ───────────────────────────────────── */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #fff;
  border: 1px solid #eaecf0;
  border-radius: 12px;
  padding: 32px 28px;
  transition: border-color .2s, box-shadow .2s;
}

.feature-card:hover {
  border-color: #c8d4e8;
  box-shadow: 0 4px 20px rgba(45, 108, 223, 0.06);
}

.feature-icon {
  font-size: 1.6em;
  font-weight: 700;
  color: #2d6cdf;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.feature-card h3 {
  font-weight: 600;
  font-size: 1.1em;
  margin-bottom: 8px;
}

.feature-card p {
  color: #555;
  font-size: 0.95em;
  line-height: 1.6;
}


/* ── How it works ────────────────────────────────────── */

.steps {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #2d6cdf;
  color: #fff;
  font-weight: 600;
  font-size: 1.1em;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.step-body h3 {
  font-weight: 600;
  font-size: 1.1em;
  margin-bottom: 6px;
}

.step-body p {
  color: #555;
  font-size: 0.95em;
  line-height: 1.65;
}


/* ── Technical ───────────────────────────────────────── */

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 56px;
}

.tech-card {
  background: #fff;
  border: 1px solid #eaecf0;
  border-radius: 12px;
  padding: 32px 28px;
  transition: border-color .2s;
}

.tech-card:hover {
  border-color: #c8d4e8;
}

.tech-card h3 {
  font-weight: 600;
  font-size: 1.05em;
  margin-bottom: 10px;
}

.tech-card p {
  color: #555;
  font-size: 0.95em;
  line-height: 1.65;
}

.tech-specs {
  max-width: 540px;
  margin: 0 auto;
}

.tech-specs h3 {
  font-weight: 600;
  font-size: 1.1em;
  margin-bottom: 20px;
  text-align: center;
}

.tech-specs table {
  width: 100%;
  border-collapse: collapse;
}

.tech-specs td {
  padding: 10px 0;
  border-bottom: 1px solid #eaecf0;
  font-size: 0.95em;
}

.tech-specs td:first-child {
  font-weight: 500;
  color: #333;
  width: 45%;
}

.tech-specs td:last-child {
  color: #555;
}


/* ── Download ────────────────────────────────────────── */

.download-section {
  text-align: center;
}

.download-section p {
  color: #555;
  font-size: 1.1em;
  margin-bottom: 32px;
}

.download-meta {
  display: block;
  margin-top: 16px;
  font-size: 0.88em;
  color: #888;
}


/* ── Footer ──────────────────────────────────────────── */

footer {
  padding: 40px 0;
  border-top: 1px solid #eaecf0;
  text-align: center;
}

footer p {
  color: #999;
  font-size: 0.88em;
}


/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 768px) {
  #hero h1 {
    font-size: 2.8em;
  }

  .tagline {
    font-size: 1.2em;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .tech-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 0.85em;
  }

  section {
    padding: 64px 0;
  }

  #hero {
    padding: 120px 0 72px;
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: 14px;
  }

  #hero h1 {
    font-size: 2.2em;
  }

  .container {
    padding: 0 20px;
  }
}