:root {
  --primary-color: #00dbff; /* Cyan */
  --secondary-color: #f40090; /* Pink */
  --accent-color: #4b0082; /* Indigo/Purple */
  --bg-color: #ffffff;
  --text-color: #333333;
  --light-gray: #f9f9f9;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  font-family: var(--font-main);
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  overflow-x: hidden;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Icon */
header {
  padding: 80px 0 40px;
  text-align: center;
  background: linear-gradient(135deg, rgba(0, 219, 255, 0.05) 0%, rgba(244, 0, 144, 0.05) 100%);
}

.profile-icon {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid white;
  margin-bottom: 25px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  background: white; /* 背景を白にすることで透過部分の粗さを軽減 */
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 10px;
}

.tagline {
  font-size: 1.1rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

/* Sections */
section {
  padding: 80px 0;
  border-bottom: 1px solid #eee;
}

section:last-child {
  border-bottom: none;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  gap: 15px;
}

h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 24px;
  background: var(--secondary-color);
  border-radius: 2px;
}

/* About & Tools */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.card {
  background: var(--light-gray);
  padding: 30px;
  border-radius: 16px;
  transition: transform 0.3s ease;
}

.card h3 {
  margin-bottom: 15px;
  color: var(--secondary-color);
}

.tools-list {
  list-style: none;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 15px;
}

.tool-tag {
  background: white;
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid #ddd;
  font-weight: 500;
}

/* AI Section */
.ai-section {
  background-color: rgba(244, 0, 144, 0.08);
  color: var(--text-color);
  border: 1px solid rgba(244, 0, 144, 0.15);
  border-radius: 24px;
  padding: 60px 40px;
  margin: 40px 0;
}

.ai-section h2 {
  color: var(--accent-color);
}

.ai-section h2::before {
  background: var(--primary-color);
}

.ai-quote {
  font-size: 1.4rem;
  font-style: italic;
  margin-bottom: 20px;
  border-left: 4px solid var(--primary-color);
  padding-left: 20px;
}

/* Future Goal */
.goal-content {
  background: linear-gradient(to right, #fdfbfb 0%, #ebedee 100%);
  padding: 40px;
  border-radius: 16px;
  position: relative;
  overflow: hidden;
}

.goal-content::after {
  content: "Web 2.5";
  position: absolute;
  top: -20px;
  right: -10px;
  font-size: 5rem;
  font-weight: 900;
  color: rgba(0, 0, 0, 0.03);
  pointer-events: none;
}

.highlight {
  color: var(--secondary-color);
  font-weight: 600;
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 0;
  color: #888;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  section {
    padding: 60px 0;
  }
}