/* ============================================================
   J-PMC Consulting Website - Main Stylesheet
   Professional, Responsive, Modern Design
   ============================================================ */

/* ============================================================
   CSS VARIABLES - Brand Colors & Design Tokens
   ============================================================ */
:root {
  /* Brand Colors */
  --primary-navy: #002B5C;
  --primary-blue: #0056B3;
  --dark-blue: #004080;

  /* Supporting Colors */
  --white: #FFFFFF;
  --light-bg: #F5F7FA;
  --border-gray: #E0E0E0;
  --text-dark: #333333;
  --text-medium: #666666;

  /* Tier Colors (for EQ classifications) */
  --tier-gold: #FFA500;
  --tier-green: #28A745;
  --tier-yellow: #FFC107;
  --tier-red: #DC3545;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-japanese: 'Hiragino Kaku Gothic Pro', Meiryo, 'MS PGothic', sans-serif;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* ============================================================
   RESET & BASE STYLES
   ============================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  line-height: 1.5;
  color: var(--text-dark);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: 60px;
}

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

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: var(--primary-navy);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 3px solid var(--primary-blue);
  display: inline-block;
}

h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-sm);
  font-size: 1.05rem;
  line-height: 1.5;
}

strong {
  color: var(--primary-navy);
  font-weight: 600;
}

em {
  color: var(--text-medium);
  font-style: italic;
}

/* ============================================================
   HEADER & NAVIGATION
   ============================================================ */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border-gray);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.logo-link:hover {
  opacity: 0.8;
}

.logo-img {
  height: 40px;
  width: auto;
}

.menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: none;
  color: var(--primary-navy);
  padding: 8px;
}

.menu-toggle:hover {
  background: var(--light-bg);
  border-radius: 4px;
}

.main-nav {
  display: flex;
  gap: 15px;
  align-items: center;
}

.nav-btn {
  text-decoration: none;
  color: var(--primary-navy);
  font-weight: 500;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 20px;
  transition: all var(--transition-normal);
  white-space: nowrap;
  border: 2px solid transparent;
}

.nav-btn:hover {
  background: var(--primary-blue);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.nav-btn.active {
  background: var(--primary-navy);
  color: var(--white);
}

.lang-btn {
  background: var(--primary-navy);
  color: var(--white);
  font-weight: 600;
}

.lang-btn:hover {
  background: var(--dark-blue);
  transform: translateY(-2px);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero-section {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  background: linear-gradient(135deg, var(--light-bg) 0%, var(--white) 100%);
  border-bottom: 1px solid var(--border-gray);
}

.hero-title {
  font-size: 3rem;
  color: var(--primary-navy);
  margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--text-medium);
  font-style: italic;
  margin-bottom: var(--spacing-md);
}

.hero-container {
  display: flex;
  flex-direction: column;
}

/* ============================================================
   CONTAINER & LAYOUT
   ============================================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.content-section {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--border-gray);
}

.content-section:nth-child(even) {
  background: var(--light-bg);
}

.section-divider {
  margin: var(--spacing-xl) 0;
  border: none;
  height: 1px;
  background: var(--border-gray);
}

/* ============================================================
   IMAGES & FIGURES
   ============================================================ */
.content-image {
  display: block;
  margin: var(--spacing-lg) auto;
  max-width: 45%;
  min-width: 400px;
  width: 50%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}

figure {
  margin: var(--spacing-lg) 0;
  text-align: center;
}

figcaption {
  margin-top: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--text-medium);
  font-style: italic;
}

/* ============================================================
   LISTS
   ============================================================ */
ul, ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.5;
}

li strong {
  color: var(--primary-blue);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--primary-navy);
  color: var(--white);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.site-footer p {
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
  line-height: 1.6;
}

.site-footer a {
  color: var(--tier-yellow);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer a:hover {
  color: var(--white);
  text-decoration: underline;
}

/* ============================================================
   RESPONSIVE DESIGN - TABLET
   ============================================================ */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 56px;
    right: 0;
    background: var(--white);
    border-left: 1px solid var(--border-gray);
    border-bottom: 1px solid var(--border-gray);
    box-shadow: var(--shadow-md);
    width: 250px;
    flex-direction: column;
    gap: 10px;
    padding: var(--spacing-md);
    display: none;
  }

  .main-nav.show {
    display: flex;
  }

  .nav-btn {
    width: 100%;
    text-align: center;
    font-size: 15px;
    padding: 10px 14px;
  }

  .logo-img {
    height: 42px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  h3 {
    font-size: 1.3rem;
  }

  .content-section {
    padding: var(--spacing-lg) 0;
  }
}

/* ============================================================
   RESPONSIVE DESIGN - MOBILE
   ============================================================ */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .logo-img {
    height: 35px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

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

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.text-center {
  text-align: center;
}

.text-justify {
  text-align: justify;
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  .site-header,
  .menu-toggle,
  .main-nav {
    display: none;
  }

  .content-section {
    page-break-inside: avoid;
  }
}

/* ============================================================
   CERTIFICATION & COMPANY LOGOS
   ============================================================ */
.certification-logo {
  display: block;
  margin: var(--spacing-md) var(--spacing-xs) var(--spacing-md) auto;
  max-width: 20%;
  min-width: 150px;
  width: 20%;
  height: auto;
  float: right;
  clear: both;
}

.footer-logos {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.footer-company-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.footer-certification-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer-logo {
  height: 60px;
  width: auto;
  background: var(--white);
  padding: var(--spacing-sm);
  border-radius: 8px;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

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

.footer-logo:hover {
  opacity: 0.8;
}

.footer-certification-logo {
  height: 100px;
  width: auto;
  transition: all var(--transition-fast);
}

.footer-certification-logo:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  opacity: 0.8;
}

/* ============================================================
   RESPONSIVE - Certification & Footer Logos
   ============================================================ */
@media (max-width: 768px) {
  .content-image {
    max-width: 70%;
    min-width: 300px;
    width: 70%;
  }

  .certification-logo {
    max-width: 30%;
    min-width: 120px;
    width: 30%;
    float: right;
  }
  
  .footer-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
  }
  
  .footer-logo {
    height: 60px;
    width: auto;
    background: var(--white);
    padding: var(--spacing-sm);
    border-radius: 8px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
  }

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

@media (max-width: 480px) {
  .content-image {
    max-width: 90%;
    min-width: 250px;
    width: 90%;
  }

  .certification-logo {
    max-width: 40%;
    min-width: 100px;
    width: 40%;
    float: right;
  }

  .header-wrap {
    padding: 8px 20px;
  }

  .footer-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
  }

  .footer-logo {
    height: 35px;
    width: auto;
    background: var(--white);
    padding: var(--spacing-xs);
    border-radius: 8px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
  }

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