:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-text: #1f2330;
  --color-text-muted: #5b6072;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f6fb;
  --color-border: #e6e6ef;
  --radius: 12px;
  --max-width: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 12px;
}

h2 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 40px;
}

p {
  color: var(--color-text-muted);
  margin: 0 0 16px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--color-text);
}

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-weight: 500;
}

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

.nav-cta {
  padding: 10px 18px;
}

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
  padding: 80px 0;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 48px;
}

.hero-copy {
  flex: 1;
}

.hero h1 {
  font-size: 3rem;
}

.hero-sub {
  font-size: 1.15rem;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 24px;
}

.hero-art {
  flex-shrink: 0;
}

.hero-logo {
  width: 220px;
  height: 220px;
  border-radius: 32px;
  box-shadow: 0 20px 60px rgba(79, 70, 229, 0.25);
}

/* Features */
.features {
  padding: 80px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-alt);
}

.feature-card h3 {
  font-size: 1.1rem;
}

.feature-card p {
  margin-bottom: 0;
}

/* How it works */
.how-it-works {
  padding: 80px 0;
  background: var(--color-bg-alt);
}

.steps {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.steps li {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.steps p {
  margin-bottom: 0;
}

/* Install */
.install {
  padding: 80px 0;
}

.install-inner {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.install-sub {
  margin-bottom: 28px;
}

.install-btn {
  margin-bottom: 16px;
}

.install-fallback,
.install-installed {
  font-size: 0.95rem;
  margin-bottom: 0;
}

.install-fallback a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.install-fallback a:hover {
  text-decoration: underline;
}

.install-installed {
  color: var(--color-primary);
  font-weight: 600;
}

/* FAQ */
.faq {
  padding: 80px 0;
  max-width: 720px;
  margin: 0 auto;
}

.faq details {
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  margin-top: 12px;
  margin-bottom: 0;
}

/* CTA */
.cta {
  background: var(--color-primary);
  color: #fff;
  padding: 72px 0;
}

.cta-inner {
  text-align: center;
}

.cta h2 {
  color: #fff;
}

.cta p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
}

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

.cta .btn-primary:hover {
  background: #f0f0f8;
  box-shadow: none;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a {
  text-decoration: none;
  color: var(--color-text-muted);
}

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

@media (max-width: 720px) {
  .site-nav {
    display: none;
  }

  .hero-inner {
    flex-direction: column;
    text-align: center;
  }

  .hero-sub {
    max-width: none;
  }

  .hero-actions {
    justify-content: center;
  }

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

  .footer-inner {
    flex-direction: column;
    gap: 12px;
  }
}