/*!
Theme Name: Kasahara Theme 2.0
Theme URI: https://www.kasahara-g.co.jp
Author: Kasahara Group
Description: Simplified, performance-optimized WordPress theme
Version: 2.0.0
License: GPL v2 or later
*/

/* ==========================================================================
   VARIABLES (CSS Custom Properties)
   ========================================================================== */

:root {
  /* Colors */
  --color-primary: #007bff;
  --color-secondary: #ff7f7f;
  --color-dark: #0e1b4d;
  --color-text: #2f3138;
  --color-bg: #f5f5f5;
  --color-white: #ffffff;
  --color-black: #000000;
  
  /* Company Colors */
  --color-kensetsu: #cc0011;
  --color-syuhou: #A601A2;
  --color-yutaka: #e6ac00;
  --color-densetsu: #EF5F00;
  --color-sanko: #0046bc;
  --color-karatsu: #32cd32;
  --color-kousan: #cc0011;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-xxl: 32px;
  --spacing-xxxl: 48px;
  
  /* Typography */
  --font-primary: 'Open Sans', sans-serif;
  --font-heading: 'Raleway', sans-serif;
  --font-ja: 'Hiragino Sans', 'Meiryo', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --line-height-base: 1.6;
  --line-height-heading: 1.3;
  
  /* Breakpoints (as variables for reference) */
  --bp-mobile: 599px;
  --bp-tablet: 768px;
  --bp-desktop: 992px;
  --bp-wide: 1200px;
  
  /* Transitions */
  --transition-base: all 0.3s ease-in-out;
  --transition-color: color 0.3s ease-in-out;
}

/* ==========================================================================
   NORMALIZE & BASE STYLES
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  background-color: var(--color-bg);
}

body {
  color: var(--color-text);
  background-color: var(--color-white);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--color-dark);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--line-height-heading);
}

h1 { font-size: 48px; }
h2 { font-size: 36px; }
h3 { font-size: 28px; }
h4 { font-size: 24px; }
h5 { font-size: 20px; }
h6 { font-size: 16px; }

p {
  margin: 0 0 var(--spacing-lg) 0;
}

p:last-child {
  margin-bottom: 0;
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-color);
}

a:hover {
  color: #0056b3;
  text-decoration: underline;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */

#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 90px;
  background-color: rgba(0, 0, 0, 0.7);
  padding: 15px 0;
  z-index: 997;
  display: flex;
  align-items: center;
  transition: var(--transition-base);
}

#header.header-scrolled {
  background-color: rgba(40, 40, 40, 0.9);
}

.header-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo */
.site-branding {
  flex-shrink: 0;
}

.site-branding img {
  max-height: 130px;
  width: auto;
}

/* Main Navigation */
.main-navigation {
  flex-grow: 1;
  display: flex;
  justify-content: center;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 14px;
  padding: var(--spacing-sm);
  transition: var(--transition-color);
}

.nav-menu a:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

/* Mobile Nav Toggle */
#mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 24px;
  cursor: pointer;
  padding: var(--spacing-md);
  margin-left: auto;
}

#mobile-nav-toggle:hover {
  color: var(--color-secondary);
}

/* Mobile Navigation */
#mobile-nav {
  position: fixed;
  top: 0;
  left: -260px;
  bottom: 0;
  width: 260px;
  background-color: rgba(200, 160, 100, 0.95);
  padding-top: 18px;
  z-index: 998;
  overflow-y: auto;
  transition: left 0.3s ease-in-out;
}

#mobile-nav a {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-white);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-base);
}

#mobile-nav a:hover {
  background-color: rgba(0, 0, 0, 0.2);
}

body.mobile-nav-active #mobile-nav {
  left: 0;
}

#mobile-body-overly {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 996;
  display: none;
}

body.mobile-nav-active #mobile-body-overly {
  display: block;
}

/* ==========================================================================
   MAIN CONTENT
   ========================================================================== */

main#main {
  max-width: 1200px;
  margin: 90px auto 0;
  padding: 0;
  background-color: var(--color-white);
  min-height: 400px;
}

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

section {
  padding: var(--spacing-xxxl) 0;
}

section:nth-child(even) {
  background-color: var(--color-bg);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99;
  transition: var(--transition-base);
  font-size: 18px;
}

.back-to-top:hover {
  background-color: #0056b3;
  transform: translateY(-2px);
}

.back-to-top.show {
  display: flex;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

#footer {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: var(--spacing-xxxl) var(--spacing-lg);
  margin-top: var(--spacing-xxxl);
  text-align: center;
}

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

.footer-logo {
  margin-bottom: var(--spacing-xl);
}

.footer-logo img {
  max-height: 80px;
  width: auto;
}

.footer-menu {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  list-style: none;
  margin: var(--spacing-xl) 0;
  flex-wrap: wrap;
}

.footer-menu a {
  color: var(--color-white);
  font-size: var(--font-size-sm);
}

.footer-menu a:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

.copyright {
  font-size: var(--font-size-sm);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  margin-top: var(--spacing-lg);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

button,
.btn,
a.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: transparent;
  color: var(--color-dark);
  border: 2px solid var(--color-dark);
  border-radius: 4px;
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-base);
}

button:hover,
.btn:hover,
a.btn:hover {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* ==========================================================================
   FORMS
   ========================================================================== */

input,
textarea,
select {
  width: 100%;
  max-width: 100%;
  padding: var(--spacing-md);
  font-family: inherit;
  font-size: inherit;
  border: 1px solid #ddd;
  border-radius: 4px;
  background-color: var(--color-white);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-dark);
}

/* ==========================================================================
   RESPONSIVE DESIGN (Mobile First)
   ========================================================================== */

/* Tablet (768px and up) */
@media (min-width: 768px) {
  h1 { font-size: 42px; }
  h2 { font-size: 32px; }
  h3 { font-size: 26px; }
}

/* Desktop (992px and up) */
@media (min-width: 992px) {
  h1 { font-size: 48px; }
  h2 { font-size: 36px; }
  h3 { font-size: 28px; }

  #mobile-nav-toggle {
    display: none;
  }

  .main-navigation {
    display: flex;
  }
}

/* Mobile (max 599px) */
@media (max-width: 599px) {
  :root {
    --spacing-xxxl: 24px;
  }

  #header {
    height: 60px;
    padding: 10px 0;
  }

  .site-branding img {
    max-height: 80px;
  }

  #mobile-nav-toggle {
    display: block;
  }

  .main-navigation {
    display: none;
  }

  main#main {
    margin-top: 60px;
  }

  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
  h4 { font-size: 18px; }

  section {
    padding: var(--spacing-xl) 0;
  }

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

  .footer-menu {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  button,
  .btn,
  a.btn {
    display: block;
    width: 100%;
    text-align: center;
  }
}

/* Tablet (600-991px) */
@media (min-width: 600px) and (max-width: 991px) {
  #mobile-nav-toggle {
    display: none;
  }

  .main-navigation {
    display: flex;
    justify-content: center;
  }

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

  .nav-menu a {
    font-size: 13px;
  }
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.m-0 { margin: 0; }
.mb-0 { margin-bottom: 0; }
.mt-xl { margin-top: var(--spacing-xl); }
.p-0 { padding: 0; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================================================
   PRINT
   ========================================================================== */

@media print {
  #header,
  #footer,
  .back-to-top,
  #mobile-nav-toggle {
    display: none;
  }
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}