/* Design System & Variables */
:root {
  --font-family-sans: 'Outfit', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Modern Cool-Light Color Palette */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-light: #94a3b8;
  
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --accent-gradient-hover: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --accent-soft: rgba(59, 130, 246, 0.1);
  --accent-soft-purple: rgba(139, 92, 246, 0.1);
  
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 20px 25px -5px rgba(59, 130, 246, 0.1), 0 10px 10px -6px rgba(139, 92, 246, 0.05);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition-smooth);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: var(--transition-smooth);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 2rem 4rem 2rem;
  position: relative;
  overflow: hidden;
}

/* Background Decorative Blobs */
.hero::before, .hero::after {
  content: '';
  position: absolute;
  border-radius: var(--radius-full);
  filter: blur(80px);
  z-index: -1;
  opacity: 0.45;
}

.hero::before {
  top: 15%;
  right: 10%;
  width: 300px;
  height: 300px;
  background: rgba(59, 130, 246, 0.2);
  animation: float-slow 10s ease-in-out infinite alternate;
}

.hero::after {
  bottom: 15%;
  left: 5%;
  width: 250px;
  height: 250px;
  background: rgba(139, 92, 246, 0.2);
  animation: float-slow 8s ease-in-out infinite alternate-reverse;
}

@keyframes float-slow {
  0% { transform: translateY(0) scale(1); }
  100% { transform: translateY(-20px) scale(1.1); }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
  width: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-purple);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  animation: fade-in-down 0.8s ease-out;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  animation: fade-in-down 1s ease-out;
}

.hero-title span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 540px;
  animation: fade-in-down 1.2s ease-out;
}

.typewriter {
  border-right: 2px solid var(--accent-blue);
  white-space: nowrap;
  animation: blink 0.75s step-end infinite;
}

@keyframes blink {
  from, to { border-color: transparent }
  50% { border-color: var(--accent-blue); }
}

.hero-cta {
  display: flex;
  gap: 1rem;
  animation: fade-in-down 1.4s ease-out;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-bounce);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  transform: translateY(-2px);
}

/* Hero Avatar Area (Using elegant gradient placeholder box with relative size) */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  animation: fade-in-up 1.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.avatar-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  background: var(--accent-gradient);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: morphing 15s ease-in-out infinite alternate;
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-placeholder {
  width: 95%;
  height: 95%;
  background-color: var(--bg-secondary);
  border-radius: inherit;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: var(--text-secondary);
  font-weight: 600;
  padding: 1.5rem;
  text-align: center;
  border: 4px solid var(--bg-secondary);
  transition: var(--transition-smooth);
}

.avatar-placeholder svg {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  color: var(--accent-purple);
}

@keyframes morphing {
  0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
  25% { border-radius: 58% 42% 75% 25% / 76% 46% 54% 24%; }
  50% { border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%; }
  75% { border-radius: 33% 67% 58% 42% / 63% 68% 32% 37%; }
  100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
}

/* Animations */
@keyframes fade-in-down {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Sections Common Style */
.section {
  padding: 7rem 2rem;
}

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

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* About Section */
.about {
  background-color: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 4rem;
  align-items: center;
}

.about-info-card {
  background-color: var(--bg-primary);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.info-item:last-child {
  margin-bottom: 0;
}

.info-icon {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
  color: var(--accent-blue);
  flex-shrink: 0;
}

.info-label {
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 600;
  text-transform: uppercase;
}

.info-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.about-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.highlight-card {
  padding: 1.25rem;
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.highlight-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-purple);
  margin-bottom: 0.25rem;
}

.highlight-card p {
  font-size: 0.875rem;
  margin-bottom: 0;
  color: var(--text-secondary);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.skills-category {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.skills-category:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.category-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--bg-tertiary);
}

.category-icon {
  color: var(--accent-purple);
  display: flex;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
}

.skill-bar-bg {
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  width: 0; /* Dynamic animate in JS */
  transition: width 1.5s cubic-bezier(0.1, 1, 0.1, 1);
}

/* Projects Section */
.projects {
  background-color: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-bounce);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(139, 92, 246, 0.2);
}

/* Project Visual Area - Using CSS Background Gradients */
.project-visual {
  height: 180px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.25rem;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.project-visual::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--accent-gradient);
  opacity: 0.85;
  transition: var(--transition-smooth);
  z-index: 1;
}

.project-card:hover .project-visual::before {
  opacity: 0.95;
  background: var(--accent-gradient-hover);
}

.project-visual span {
  position: relative;
  z-index: 2;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.project-tag {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.25rem 0.75rem;
  background-color: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: #ffffff;
  z-index: 2;
}

.project-info {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.tech-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.project-link svg {
  transition: transform 0.2s ease;
}

.project-card:hover .project-link svg {
  transform: translateX(3px);
}

/* Contact Section */
.contact-container {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--bg-secondary);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--accent-soft);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-detail h5 {
  font-size: 0.85rem;
  color: var(--text-light);
  text-transform: uppercase;
  font-weight: 700;
}

.contact-detail p {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-socials {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-bounce);
}

.social-btn:hover {
  background-color: var(--accent-purple);
  color: #ffffff;
  border-color: var(--accent-purple);
  transform: translateY(-3px);
}

/* Simple Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: var(--transition-smooth);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-blue);
  background-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Footer */
footer {
  background-color: var(--bg-primary);
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Scroll Animation classes */
.reveal {
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Web Layout */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-content {
    align-items: center;
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 600px) {
  .nav-menu {
    display: none; /* In a real product, we would have a mobile hamburger. For this static simple page, we hide and stack elements */
  }
  
  .nav-container {
    justify-content: center;
  }
  
  .hero {
    padding-top: 6rem;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .avatar-wrapper {
    width: 260px;
    height: 260px;
  }
  
  .section {
    padding: 4rem 1.5rem;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .about-highlights {
    grid-template-columns: 1fr;
  }
}