:root {
  /* Google Inspired Colors */
  --google-blue: #4285f4;
  --google-red: #ea4335;
  --google-yellow: #fbbc05;
  --google-green: #34a853;

  --primary-color: var(--google-blue);
  --secondary-color: var(--google-green);
  --text-color: #3c4043;
  --text-light: #70757a;
  --bg-color: #ffffff;
  --bg-light: #f8f9fa;
  --border-color: #dadce0;

  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.302), 0 1px 3px 1px rgba(60, 64, 67, 0.149);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius-md: 12px;
  --radius-lg: 24px;
}

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

body {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  background-color: var(--bg-color);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* Layout */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

/* Header */
header {
  height: 72px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo span {
  color: var(--google-red);
}

.nav-links {
  display: flex;
  gap: 32px;
  font-weight: 500;
}

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

.cta-button {
  background-color: var(--primary-color);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
  color: white;
}

/* Typography */
h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.2;
}

h2 {
  font-size: 32px;
  text-align: center;
  margin-bottom: 48px;
}

.lead {
  font-size: 18px;
  color: var(--text-light);
  margin-bottom: 32px;
}

/* Footer */
footer {
  background-color: var(--bg-light);
  padding: 60px 0 30px;
  border-top: 1px solid var(--border-color);
}

.footer-bottom {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-light);
}

/* Cards (Portfolio, Services) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.card {
  background: white;
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-color);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}

.card h3 {
  margin-bottom: 16px;
  color: var(--primary-color);
}

/* Security Section */
.security-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: #e8f0fe;
  color: var(--google-blue);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 20px;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.security-item {
  background: white;
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  text-align: left;
}

.security-item h4 {
  color: var(--google-blue);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 36px;
  }

  .nav-links {
    display: none;
  }
}