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

:root {
  --primary-green: #2E7D32;
  --primary-green-dark: #1B5E20;
  --accent-red: #D32F2F;
  --accent-red-dark: #B71C1C;
  --light-green: #E8F5E9;
  --light-red: #FFEBEE;
  --tech-blue: #1976D2;
  --light-blue: #E3F2FD;
  --bg-gray: #F5F5F5;
  --text-dark: #212121;
  --text-gray: #666;
  --border-color: #E0E0E0;
  --card-shadow: 0 2px 4px rgba(0,0,0,0.1);
  --sidebar-bg: #2C3E50;
  --sidebar-hover: #34495E;
}

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--bg-gray);
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--primary-green-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-accent {
  background: var(--accent-red);
  color: white;
}

.btn-accent:hover {
  background: var(--accent-red-dark);
}

.btn-outline {
  background: transparent;
  border: 2px solid white;
  color: white;
}

.btn-outline:hover {
  background: white;
  color: var(--text-dark);
}