/* Clean, minimalist monochrome stylesheet for landing page */
:root {
  --bg: #ffffff;
  --bg-card: #f9fafb;
  --text-main: #111827;
  --text-muted: #4b5563;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --btn-primary-bg: #111827;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #374151;
  --btn-secondary-bg: #ffffff;
  --btn-secondary-text: #111827;
  --btn-secondary-hover: #f3f4f6;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
header {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  background-color: var(--bg);
}

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

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

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

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

.btn-secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 1px solid var(--border-strong);
}

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

.btn-large {
  padding: 12px 24px;
  font-size: 1rem;
}

/* Hero Section */
.hero {
  padding: 56px 0 40px 0;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 28px;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Content Sections */
.section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

.section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 720px;
}

/* Key Features Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px;
}

.feature-box h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.feature-box p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Step-by-Step List */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-card {
  display: flex;
  gap: 20px;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px 24px;
}

.step-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  min-width: 28px;
}

.step-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.step-body p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.step-body code {
  font-family: monospace;
  background-color: #e5e7eb;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--text-main);
}

/* Call to Action Box */
.cta-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 36px 28px;
  margin: 40px 0;
  text-align: left;
}

.cta-box h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.cta-box p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Footer */
footer {
  padding: 32px 0 48px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

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

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

@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.85rem;
  }
  .hero p {
    font-size: 1.05rem;
  }
  .step-card {
    flex-direction: column;
    gap: 8px;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}