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

:root {
  /* Completely light and vibrant color scheme - NO BLACK */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #e0f2fe;
  --color-bg-gradient: linear-gradient(135deg, #ffffff 0%, #e0f2fe 50%, #ddd6fe 100%);

  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-light: #dbeafe;
  --color-purple: #8b5cf6;
  --color-teal: #14b8a6;
  --color-orange: #f97316;

  --color-border: #e2e8f0;
  --color-success: #10b981;
  --color-error: #ef4444;

  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-japanese: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', Meiryo, sans-serif;
  /* Explicit white background */
  background: #ffffff;
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

body:lang(ja) {
  font-family: var(--font-japanese);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  /* White background with shadow */
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  padding: var(--spacing-sm) 0;
  z-index: 1000;
  transition: var(--transition-base);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.language-switcher {
  display: flex;
  /* Updated language switcher with light background */
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  padding: 4px;
  gap: 4px;
}

.lang-btn {
  padding: 6px 16px;
  border-radius: 50px;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

.lang-btn.active {
  background: var(--color-accent);
  color: white;
}

.social-links {
  display: flex;
  gap: var(--spacing-xs);
}

.social-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  /* Updated social icons with light background */
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  text-decoration: none;
  transition: var(--transition-fast);
}

.social-icon:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-xl) 0;
  margin-top: 72px;
  /* Beautiful gradient background with NO black */
  background: linear-gradient(135deg, #ffffff 0%, #e0f2fe 40%, #ddd6fe 100%);
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 900px;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.1;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
  /* Added gradient text for the title */
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title .highlight {
  font-style: italic;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 700px;
  line-height: 1.7;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md) 0;
  /* Updated borders for light theme */
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  /* Updated stat numbers with gradient */
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  padding: 14px 32px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-base);
  display: inline-block;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
  background: white;
  color: var(--color-text-primary);
  /* Updated secondary button styling */
  border: 2px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  color: var(--color-accent);
}

/* About Section */
.about {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-primary);
}

.about-content {
  max-width: 800px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-md);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.about-text p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.tech-tag {
  padding: 8px 20px;
  /* Updated tech tags with colorful backgrounds */
  background: var(--color-accent-light);
  border: 1px solid var(--color-accent);
  border-radius: 50px;
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 600;
  transition: var(--transition-fast);
}

.tech-tag:hover {
  background: var(--color-accent);
  color: white;
  transform: translateY(-2px);
}

/* Services Section */
.services {
  padding: var(--spacing-xl) 0;
  /* Light gray background */
  background: #f8fafc;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.service-card {
  /* Pure white background with border */
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: var(--transition-base);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(59, 130, 246, 0.15);
}

.service-number {
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.service-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Projects Section */
.projects {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-primary);
}

.projects-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.project-card {
  /* Updated project cards with white background */
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-base);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.project-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 12px 24px rgba(59, 130, 246, 0.15);
}

.project-preview {
  position: relative;
  height: 400px;
  overflow: hidden;
  background: var(--color-bg-tertiary);
}

.project-preview iframe {
  width: 100%;
  height: 100%;
  border: none;
  pointer-events: none;
  transform: scale(0.95);
  transition: var(--transition-base);
}

.project-card:hover .project-preview iframe {
  transform: scale(1);
}

.project-overlay {
  position: absolute;
  inset: 0;
  /* Updated overlay with semi-transparent white background */
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-base);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 14px 32px;
  background: var(--color-accent);
  color: white;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition-base);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.project-link:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

.project-info {
  padding: var(--spacing-lg);
}

.project-info h3 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.project-info p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  padding: 6px 16px;
  /* Updated tags with light colorful backgrounds */
  background: var(--color-accent-light);
  border-radius: 50px;
  font-size: 0.8125rem;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  font-weight: 500;
}

/* Contact Section */
.contact {
  padding: var(--spacing-xl) 0;
  /* Light background */
  background: #f8fafc;
}

.contact-content {
  max-width: 900px;
  margin: 0 auto;
}

.contact-intro {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.contact-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.contact-method h4 {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-method p {
  color: var(--color-text-primary);
  font-size: 1.125rem;
  font-weight: 500;
}

.contact-social {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.contact-social-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 14px 28px;
  /* Updated social links with white background */
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 50px;
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-base);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.contact-social-link:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
}

/* Completely redesigned contact form with beautiful styling */
.contact-form {
  background: #ffffff;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
  font-size: 0.9375rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: 1rem;
  color: var(--color-text-primary);
  background: #ffffff;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-light);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
  line-height: 1.6;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.btn-submit {
  width: 100%;
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-purple) 100%);
  color: #ffffff;
  border: none;
  border-radius: 50px;
  font-size: 1.0625rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
  margin-top: var(--spacing-sm);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.btn-submit:active {
  transform: translateY(0);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-message {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  font-size: 0.9375rem;
}

.form-message.success {
  background: #d1fae5;
  color: #065f46;
  border: 2px solid var(--color-success);
}

.form-message.error {
  background: #fee2e2;
  color: #991b1b;
  border: 2px solid var(--color-error);
}

/* Footer */
.footer {
  /* White background */
  background: #ffffff;
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-lg);
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.footer-info p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-xs);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.footer-col h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1rem;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: var(--spacing-xs);
}

.footer-col a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-accent);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .header-content {
    flex-wrap: wrap;
  }

  .hero {
    min-height: auto;
    padding: var(--spacing-lg) 0;
  }
  
  .hero-title {
  margin-top: 40px;
}


  .hero-stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    text-align: center;
    width: 100%;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .project-preview {
    height: 300px;
  }
  

  .footer-content {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}