:root {
  --color-brand: #2e7d32;
  --color-brand-dark: #1b5e20;
  --color-background: #f9faf8;
  --color-border: #dce2d8;
  --color-text: #1f2a24;
  --font-heading: "Montserrat", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Source Sans Pro", "Segoe UI", Roboto, sans-serif;
}

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

html, body {
  height: 100%;
}

body {
  background: linear-gradient(135deg, #f5f9f5 0%, var(--color-background) 100%);
  color: var(--color-text);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: linear-gradient(180deg, var(--color-brand) 0%, var(--color-brand-dark) 100%);
  color: white;
  padding: 3rem 2rem;
  text-align: center;
  box-shadow: 0 4px 12px rgba(27, 94, 32, 0.15);
}

header img {
  width: 80px;
  margin-bottom: 1.5rem;
}

header h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

header p {
  font-size: 1.1rem;
  opacity: 0.95;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 0.95rem;
  opacity: 0.85;
  letter-spacing: 0.05em;
}

main {
  flex: 1;
  padding: 3rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.intro {
  text-align: center;
  margin-bottom: 3rem;
}

.intro h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--color-brand);
  margin-bottom: 1rem;
}

.intro p {
  font-size: 1rem;
  color: rgba(31, 42, 36, 0.75);
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}

.manuals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.manual-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(31, 42, 36, 0.08);
  transition: all 0.3s ease;
  border: 2px solid transparent;
  display: flex;
  flex-direction: column;
}

.manual-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(31, 42, 36, 0.15);
  border-color: var(--color-brand);
}

.manual-header {
  background: linear-gradient(180deg, rgba(46, 125, 50, 0.1) 0%, rgba(46, 125, 50, 0.05) 100%);
  padding: 2rem;
  border-bottom: 2px solid var(--color-border);
}

.manual-header h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-brand);
  margin-bottom: 0.5rem;
}

.manual-specs {
  font-size: 0.9rem;
  color: rgba(31, 42, 36, 0.65);
  line-height: 1.6;
}

.manual-content {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.manual-features {
  list-style: none;
  margin-bottom: 1.5rem;
  flex: 1;
}

.manual-features li {
  padding-left: 1.5rem;
  margin-bottom: 0.6rem;
  position: relative;
  font-size: 0.95rem;
  line-height: 1.5;
  color: rgba(31, 42, 36, 0.8);
}

.manual-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-brand);
  font-weight: bold;
}

.manual-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 1rem;
}

.btn {
  flex: 1;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: all 0.3s ease;
  display: inline-block;
  letter-spacing: 0.03em;
}

.btn-primary {
  background: var(--color-brand);
  color: white;
}

.btn-primary:hover {
  background: var(--color-brand-dark);
  transform: scale(1.02);
}

.btn-secondary {
  background: white;
  color: var(--color-brand);
  border: 2px solid var(--color-brand);
}

.btn-secondary:hover {
  background: rgba(46, 125, 50, 0.05);
}

footer {
  background: rgba(31, 42, 36, 0.05);
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

footer p {
  font-size: 0.9rem;
  color: rgba(31, 42, 36, 0.65);
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-brand);
  margin: 0.5rem 0;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  main {
    padding: 2rem 1rem;
  }

  .manuals-grid {
    grid-template-columns: 1fr;
  }

  .intro h2 {
    font-size: 1.5rem;
  }
}