/* style.css */
:root {
  --primary: #1D4ED8;
  --primary-dark: #1E40AF;
  --secondary: #059669;
  --accent: #D97706;
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --text: #1E293B;
  --text-secondary: #64748B;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
}

header {
  background-color: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: var(--primary);
  text-decoration: none;
}

nav a {
  margin-left: 24px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  position: relative;
}

nav a:hover {
  color: var(--primary);
}

nav a:hover::after {
  content: '';
  position: absolute;
  bottom: -22px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
}

.hero {
  padding: 80px 32px;
  text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 20px;
  max-width: 800px;
  margin: 0 auto 32px;
  opacity: 0.95;
}

.cta-button {
  display: inline-block;
  padding: 14px 28px;
  border: none;
  border-radius: 0;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.cta-button.primary {
  background-color: white;
  color: var(--primary);
}

.cta-button.primary:hover {
  background-color: #f3f4f6;
  transform: scale(1.03);
}

.cta-button.secondary {
  background-color: var(--secondary);
  color: white;
}

.cta-button.secondary:hover {
  background-color: #047857;
}

.cta-button.accent {
  background-color: var(--accent);
  color: white;
}

.cta-button.accent:hover {
  background-color: #C25E0B;
}

.section {
  padding: 60px 32px;
}

.section h2 {
  font-size: 28px;
  color: var(--text);
  text-align: center;
  margin-bottom: 40px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card h3 {
  font-size: 20px;
  color: var(--primary);
  margin-top: 0;
  margin-bottom: 12px;
}

.feature-card.shipper {
  background: #EFF6FF;
  border-left: 4px solid var(--primary);
}

.feature-card.carrier {
  background: #ECFDF5;
  border-left: 4px solid var(--secondary);
}

.feature-card.sustainability {
  background: #FFFBEB;
  border-left: 4px solid var(--accent);
}

.tabs {
  display: flex;
  justify-content: center;
  margin: 40px auto;
  max-width: 800px;
  border-bottom: 1px solid var(--border);
}

.tab {
  padding: 12px 24px;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 3px solid transparent;
}

.tab.active {
  color: var(--primary);
  border-bottom: 3px solid var(--primary);
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
}

.value {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: 6px;
  padding: 16px;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.value:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.value h3 {
  color: var(--primary);
  margin-top: 0;
}

footer {
  text-align: center;
  padding: 40px 32px;
  color: var(--text-secondary);
  font-size: 14px;
  background-color: var(--card);
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text);
}

input, select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 16px;
  background-color: white;
}

input:focus, select:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
}

.container {
  max-width: 600px;
  margin: 60px auto;
  padding: 32px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.container h1 {
  font-size: 32px;
  color: var(--text);
  margin-bottom: 16px;
}

.container p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}