/* ===================================
   Cyberoo.AI - Professional Business Website (v5)
   Optimized for Professional Business Presentation
   Dark Theme with Minimal Animations
   =================================== */

/* Import Google Fonts */
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;600;700;900&family=Inter:wght@300;400;500;600;700;800;900&display=swap");

/* ===================================
   CSS Variables - Professional Dark Theme
   =================================== */
:root {
  /* Primary Colors - Professional Dark Palette */
  --primary-dark: #0F172A; /* Deep Navy Blue */
  --primary-navy: #1E293B; /* Darker Slate Blue */
  --primary-blue: #334155; /* Medium Slate Blue */
  --accent-cyan: #06B6D4; /* Bright Cyan */
  --accent-teal: #14B8A6; /* Vibrant Teal */
  --accent-green: #10B981; /* Emerald Green */

  /* Neutral Colors - Dark Theme */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* Dark Theme Text Colors */
  --text-primary: #E2E8F0; /* Light Gray for main text */
  --text-secondary: #94A3B8; /* Muted Gray for secondary text */
  --text-muted: #64748B; /* Darker Gray for subtle text */

  /* Background Colors */
  --bg-primary: #0F172A; /* Main background */
  --bg-secondary: #1E293B; /* Section background */
  --bg-card: #2A3441; /* Card background */
  --bg-card-hover: #334155; /* Card hover background */

  /* Gradients - Subtle Professional */
  --gradient-dark: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  --gradient-accent: linear-gradient(135deg, #06B6D4 0%, #14B8A6 100%);
  --gradient-card: linear-gradient(145deg, #2A3441 0%, #334155 100%);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  --spacing-4xl: 8rem;

  /* Typography */
  --font-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows - Subtle for Dark Theme */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.3);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* Transitions - Minimal and Professional */
  --transition-fast: 150ms ease-out;
  --transition-base: 250ms ease-out;
  --transition-slow: 400ms ease-out;
}

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

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

body {
  font-family: var(--font-primary);
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Header Styles
   =================================== */
header {
  background: var(--gradient-dark);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(6, 182, 212, 0.1);
}

.header-top {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-left {
  flex-shrink: 0;
}

.header-left a {
  display: block;
  transition: opacity var(--transition-base);
}

.header-left a:hover {
  opacity: 0.8;
}

.header-left img {
  display: block;
  height: auto;
  max-height: 48px;
  width: auto;
  filter: brightness(1.1);
}

.header-right {
  font-family: var(--font-secondary);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.3px;
  line-height: 1.4;
}

/* ===================================
   Navigation Styles
   =================================== */
.main-nav {
  background: rgba(30, 41, 59, 0.95); /* Semi-transparent dark background */
  border-bottom: 1px solid rgba(6, 182, 212, 0.1);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 110px;
  z-index: 999;
  backdrop-filter: blur(10px);
}

.main-nav ul {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xs);
  list-style: none;
  flex-wrap: wrap;
}

.main-nav a {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-base);
  border-radius: var(--radius-md);
}

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

/* ===================================
   Main Content Styles
   =================================== */
main {
  max-width: 1200px;
  margin: var(--spacing-3xl) auto;
  padding: 0 var(--spacing-xl);
}

.section {
  background: var(--bg-secondary);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl) var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(6, 182, 212, 0.1);
  position: relative;
  overflow: hidden;
}

.section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0.6;
}

/* ===================================
   Typography Styles
   =================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.75rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 1.875rem;
  color: var(--text-primary);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  position: relative;
}

h3 {
  font-size: 1.375rem;
  color: var(--text-primary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-left: var(--spacing-md);
}

h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background: var(--gradient-accent);
  border-radius: 2px;
}

p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

/* ===================================
   List Styles
   =================================== */
ul {
  list-style: none;
  margin: var(--spacing-md) 0;
  padding-left: 0;
}

.section ul li {
  position: relative;
  padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 2.5rem;
  margin-bottom: var(--spacing-sm);
  background: rgba(6, 182, 212, 0.05);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-cyan);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Removed hover animation for professional appearance */

.section ul li::before {
  content: '✓';
  position: absolute;
  left: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  background: var(--gradient-accent);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.75rem;
  box-shadow: var(--shadow-sm);
}

/* ===================================
   Link Styles
   =================================== */
a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.alink {
  text-decoration: none;
}

/* ===================================
   Contact Section - Unified Styling
   =================================== */
#contact {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid rgba(6, 182, 212, 0.1);
  position: relative;
  overflow: hidden;
}

#contact::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0.6;
}

#contact h2 {
  color: var(--text-primary);
}

#contact p {
  color: var(--text-secondary);
  font-size: 1rem;
  position: relative;
  z-index: 1;
}

/* ===================================
   Case Studies - Clear Separation
   =================================== */
.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Responsive grid */
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.case-block {
  display: block;
  background: var(--bg-card);
  border: 1px solid rgba(6, 182, 212, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-decoration: none;
  color: var(--text-secondary);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.case-block:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-card-hover);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
}

.case-block h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.case-block p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Add case number styling */
.case-block::after {
  content: attr(data-case-number);
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 40px;
  height: 40px;
  background: var(--gradient-accent);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Case metadata styling */
.case-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.case-industry,
.case-result {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.case-industry {
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.case-result {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

/* ===================================
   Form Styles
   =================================== */
form {
  max-width: 800px;
  margin: var(--spacing-2xl) auto;
  padding: var(--spacing-2xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(6, 182, 212, 0.1);
  position: relative;
  overflow: hidden;
}

form::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0.6;
}

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

input, textarea {
  width: 100%;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-base);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-cyan);
  background: var(--bg-card-hover);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

button {
  background: var(--gradient-accent);
  color: var(--white);
  border: none;
  padding: var(--spacing-md) var(--spacing-2xl);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-base);
  box-shadow: var(--shadow-md);
}

button:hover {
  opacity: 0.9;
}

/* ===================================
   Footer Styles
   =================================== */
footer {
  background: var(--gradient-dark);
  color: var(--text-primary);
  padding: var(--spacing-3xl) var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-4xl);
  box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.3);
  position: relative;
  border-top: 1px solid rgba(6, 182, 212, 0.1);
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.footer-column h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  padding-left: 0;
}

.footer-column h3::before {
  display: none;
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column ul li {
  margin-bottom: var(--spacing-sm);
  padding: 0;
  background: none;
  border: none;
  transform: none;
}

.footer-column ul li::before {
  display: none;
}

.footer-column a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-base);
  font-size: 0.9375rem;
}

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

.footer-column p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===================================
   Service Content Section
   =================================== */
#servicecon {
  background: var(--bg-secondary);
  border: 1px solid rgba(6, 182, 212, 0.1);
}

#servicecon::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0.6;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .header-top {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .header-right {
    font-size: 1rem;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav a {
    padding: var(--spacing-sm) var(--spacing-md);
    width: 100%;
    text-align: center;
  }

  main {
    padding: 0 var(--spacing-md);
    margin: var(--spacing-lg) auto;
  }

  .section {
    padding: var(--spacing-lg) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .case-block {
    padding: var(--spacing-lg);
  }

  form {
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-lg);
  }

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

@media (max-width: 480px) {
  .header-top {
    padding: var(--spacing-md);
  }

  .main-nav {
    top: 120px;
  }

  main {
    margin: var(--spacing-md) auto;
  }

  .section {
    padding: var(--spacing-md);
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.375rem;
  }

  .case-block {
    padding: var(--spacing-md);
  }

  form {
    padding: var(--spacing-md);
  }
}


/* ===================================
   Tab Styles - Professional Design
   =================================== */
.tab-container {
  max-width: 1200px;
  margin: var(--spacing-2xl) auto;
  padding: 0 var(--spacing-xl);
}

.tab-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xs);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(6, 182, 212, 0.1);
}

.tab-btn {
  flex: 1;
  max-width: 200px;
  padding: var(--spacing-md) var(--spacing-lg);
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  font-family: var(--font-secondary);
}

.tab-btn:hover {
  color: var(--text-secondary);
  background: rgba(6, 182, 212, 0.05);
}

.tab-btn.active {
  background: var(--gradient-accent);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

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

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease-in;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Tab Design */
@media (max-width: 768px) {
  .tab-container {
    padding: 0 var(--spacing-md);
  }

  .tab-content-container {
    padding: 0 var(--spacing-md);
  }

  .tab-nav {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .tab-btn {
    max-width: none;
    text-align: center;
  }
}