/* Modern Light-Theme Design System */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;700;900&display=swap');

:root {
  /* Colors */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-secondary: #06b6d4;
  --accent-secondary-hover: #0891b2;
  --success: #10b981;
  --border-color: #e2e8f0;
  --glow-color: rgba(79, 70, 229, 0.08);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 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 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-secondary: #111827;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --accent-primary: #6366f1;
  --accent-primary-hover: #818cf8;
  --accent-secondary: #22d3ee;
  --accent-secondary-hover: #67e8f9;
  --border-color: #1f2937;
  --glow-color: rgba(99, 102, 241, 0.15);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-primary-hover);
}

/* Navigation Bar */
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 var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="dark"] header {
  background-color: rgba(17, 24, 39, 0.8);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-primary);
  transition: width var(--transition-normal);
}

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

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

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transform: scale(1.1);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

.theme-toggle-btn .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle-btn .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
}

/* Hero Section */
.hero {
  padding: 10rem 2rem 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 90vh;
  gap: 4rem;
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--glow-color);
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: 9999px;
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
}

.hero-title span {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 14px 0 rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(79, 70, 229, 0.35);
  color: #ffffff;
}

.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-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.avatar-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  animation: morphing 15s ease-in-out infinite alternate;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 40px rgba(79, 70, 229, 0.2);
}

.avatar-inner {
  width: calc(100% - 16px);
  height: calc(100% - 16px);
  border-radius: inherit;
  background-color: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: background-color var(--transition-normal);
}

.avatar-emoji {
  font-size: 6rem;
  filter: drop-shadow(0 10px 10px rgba(0,0,0,0.15));
  animation: hover-float 4s ease-in-out infinite;
}

@keyframes morphing {
  0% {
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  }
  25% {
    border-radius: 58% 42% 75% 25% / 56% 45% 55% 44%;
  }
  50% {
    border-radius: 50% 50% 33% 67% / 63% 27% 73% 37%;
  }
  75% {
    border-radius: 33% 67% 58% 42% / 63% 68% 32% 37%;
  }
  100% {
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  }
}

@keyframes hover-float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Sections General */
section {
  padding: 8rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.section-subtitle {
  color: var(--accent-primary);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 4px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 2px;
}

/* About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: center;
}

.about-info-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.about-info-box:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.about-details {
  list-style: none;
}

.about-details li {
  display: flex;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.about-details li:last-child {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

.about-details .label {
  font-weight: 700;
  width: 120px;
  color: var(--text-secondary);
}

.about-details .value {
  color: var(--text-primary);
}

.about-text h3 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.8;
}

/* Skills Section */
.skills-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.tab-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.6rem 1.2rem;
  border-radius: 9999px;
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

.tab-btn.active {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
  transition: opacity 0.3s ease;
}

.skill-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.skill-card:hover::before {
  opacity: 1;
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
}

.skill-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.skill-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.skill-level-wrapper {
  width: 100%;
}

.skill-level-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.skill-bar-bg {
  width: 100%;
  height: 6px;
  background-color: var(--bg-primary);
  border-radius: 999px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 999px;
  width: 0%;
  transition: width 1.5s cubic-bezier(0.1, 1, 0.1, 1);
}

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

.work-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.work-thumbnail {
  height: 220px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 4rem;
  overflow: hidden;
}

.work-thumbnail::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.1);
}

.work-thumbnail-emoji {
  transition: transform var(--transition-slow);
  z-index: 2;
}

.work-card:hover .work-thumbnail-emoji {
  transform: scale(1.15) rotate(5deg);
}

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

.work-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.work-tag {
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.work-info h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.work-info p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.work-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-primary);
}

.work-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.work-card:hover .work-link svg {
  transform: translateX(4px);
}

/* Contact Section */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
}

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

.contact-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}

.contact-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.contact-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--glow-color);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.contact-card h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.contact-card p, .contact-card a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
}

.contact-form-wrapper {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

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

.form-submit-btn {
  width: 100%;
}

.form-status {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: var(--radius-sm);
  display: none;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  animation: fadeIn 0.3s ease;
}

.form-status.success {
  display: block;
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 3rem 2rem;
  text-align: center;
  transition: background-color var(--transition-normal);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

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

.social-link {
  color: var(--text-muted);
  font-size: 1.25rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.social-link:hover {
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.copyright {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 992px) {
  .hero {
    flex-direction: column-reverse;
    padding-top: 8rem;
    gap: 3rem;
    text-align: center;
  }
  .hero-content {
    max-width: 100%;
  }
  .hero-buttons {
    justify-content: center;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .contact-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* Mobile menu can be added */
  }
  .hero-title {
    font-size: 2.75rem;
  }
  .avatar-wrapper {
    width: 260px;
    height: 260px;
  }
  .avatar-emoji {
    font-size: 5rem;
  }
  section {
    padding: 5rem 1.5rem;
  }
  .contact-form-wrapper {
    padding: 2rem;
  }
}