/* @import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

:root {
  /* Color Palette (Modern & Premium Light Design) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --color-primary: #4f46e5;       /* Indigo */
  --color-primary-light: #818cf8;
  --color-secondary: #06b6d4;     /* Cyan */
  --color-secondary-light: #67e8f9;
  --color-accent: #f43f5e;        /* Rose */
  
  --gradient-hero: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  --gradient-accent: linear-gradient(135deg, #ff007f 0%, #7f00ff 100%);
  --gradient-card-hover: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
  
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px 0 rgba(0, 0, 0, 0.03);
  --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 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-premium: 0 20px 25px -5px rgba(79, 70, 229, 0.1), 0 10px 10px -5px rgba(6, 182, 212, 0.04);
  --shadow-inset: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  --font-sans: 'Outfit', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --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 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

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

/* Navigation Header */
.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(241, 245, 249, 0.8);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-secondary);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px var(--color-secondary-light);
}

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

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  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(--gradient-hero);
  transition: var(--transition-smooth);
}

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

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

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px; /* offset header */
  position: relative;
  background: radial-gradient(circle at 90% 10%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
              radial-gradient(circle at 10% 90%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
  width: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 0.5rem 1rem;
  background-color: rgba(79, 70, 229, 0.08);
  color: var(--color-primary);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid rgba(79, 70, 229, 0.15);
  box-shadow: 0 2px 10px rgba(79, 70, 229, 0.03);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 580px;
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
  gap: 0.5rem;
}

.btn-primary {
  background: var(--gradient-hero);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid rgba(226, 232, 240, 0.8);
}

.btn-secondary:hover {
  background-color: #f1f5f9;
  transform: translateY(-2px);
}

/* Avatar / Visual (Custom CSS Art since AI image generation is disabled) */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.avatar-container {
  width: 320px;
  height: 320px;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-glow {
  position: absolute;
  width: 105%;
  height: 105%;
  background: var(--gradient-hero);
  border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
  filter: blur(15px);
  opacity: 0.4;
  animation: blob-spin 12s linear infinite;
  z-index: 1;
}

.avatar-frame {
  width: 100%;
  height: 100%;
  background: var(--gradient-hero);
  border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2;
  box-shadow: var(--shadow-premium);
  animation: blob-spin 8s linear infinite;
  border: 4px solid var(--bg-secondary);
  overflow: hidden;
}

.avatar-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  z-index: 3;
  animation: content-keep-upright 8s linear infinite;
}

.avatar-initial {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  text-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.avatar-subtitle {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  opacity: 0.9;
  text-transform: uppercase;
  margin-top: 0.25rem;
}

/* Animations */
@keyframes blob-spin {
  0% {
    border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
    transform: rotate(0deg);
  }
  50% {
    border-radius: 70% 30% 52% 48% / 60% 40% 60% 40%;
  }
  100% {
    border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
    transform: rotate(360deg);
  }
}

@keyframes content-keep-upright {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(-360deg);
  }
}

/* Section Common Styles */
.section {
  padding: 7rem 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 4.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.section-subtitle {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-hero);
  border-radius: 2px;
}

/* About Me Details */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: flex-start;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-text h3 {
  font-size: 1.75rem;
  font-weight: 700;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.info-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.info-card {
  background-color: var(--bg-primary);
  padding: 1.5rem;
  border-radius: 16px;
  border: 1px solid rgba(226, 232, 240, 0.6);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-bounce);
}

.info-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 70, 229, 0.2);
}

.info-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.info-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.info-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-category {
  background-color: var(--bg-secondary);
  padding: 2.25rem;
  border-radius: 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(241, 245, 249, 0.8);
  transition: var(--transition-smooth);
}

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

.skill-category-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.skill-category-icon {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.5rem;
}

.skill-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: 0.95rem;
  font-weight: 500;
}

.skill-name {
  color: var(--text-primary);
}

.skill-percentage {
  color: var(--color-primary);
}

.skill-bar {
  height: 8px;
  background-color: #f1f5f9;
  border-radius: 9999px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: var(--gradient-hero);
  border-radius: 9999px;
  width: 0;
  transition: width 1.5s cubic-bezier(0.1, 0.8, 0.2, 1);
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2.5rem;
}

.project-card {
  background-color: var(--bg-primary);
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid rgba(226, 232, 240, 0.8);
  box-shadow: var(--shadow-md);
  transition: var(--transition-bounce);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-premium);
  border-color: rgba(79, 70, 229, 0.25);
  background: var(--gradient-card-hover);
}

.project-image-placeholder {
  height: 220px;
  background: var(--gradient-hero);
  opacity: 0.9;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #ffffff;
  position: relative;
}

.project-tag {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--color-primary);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.project-icon-art {
  font-size: 4rem;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.15));
}

.project-info {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex-grow: 1;
}

.project-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

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

.tech-tag {
  background-color: #f1f5f9;
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  font-weight: 500;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 1rem;
  align-self: flex-start;
  font-size: 0.95rem;
}

.project-link:hover {
  gap: 0.5rem;
}

/* Contact Section */
.contact-container {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--bg-secondary);
  border-radius: 32px;
  box-shadow: var(--shadow-premium);
  border: 1px solid rgba(241, 245, 249, 0.8);
  padding: 3.5rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.contact-info-list {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 2.5rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.5rem;
}

.contact-item-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: rgba(79, 70, 229, 0.08);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-bounce);
}

.contact-item:hover .contact-item-icon {
  transform: scale(1.1);
  background-color: var(--color-primary);
  color: #ffffff;
}

.contact-item-label {
  font-weight: 700;
  font-size: 0.95rem;
}

.contact-item-value {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Simulated form (non-functional interactive element) */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

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

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-textarea {
  padding: 1rem 1.25rem;
  border-radius: 12px;
  border: 1px solid rgba(226, 232, 240, 0.8);
  font-family: inherit;
  font-size: 0.95rem;
  background-color: var(--bg-primary);
  transition: var(--transition-smooth);
  color: var(--text-primary);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  background-color: #ffffff;
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid rgba(241, 245, 249, 0.8);
  padding: 3rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.footer-socials {
  display: flex;
  gap: 1.5rem;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(226, 232, 240, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: var(--transition-bounce);
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-content {
    align-items: center;
  }
  
  .hero-description {
    margin: 0 auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* simple hidden nav on mobile to avoid complex burger JS */
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .section {
    padding: 5rem 0;
  }
  
  .contact-container {
    padding: 2rem;
  }
}