/*
Theme Name: Kobayashi Kougyousyo
Theme URI: https://kobayashi-kougyou.co.jp
Author: Kobayashi Kougyousyo
Author URI: https://kobayashi-kougyou.co.jp
Description: 有限会社小林工業所 コーポレートサイト用カスタムテーマ
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: kobayashi
*/

/* ==========================================================================
   CSS Variables - Design Tokens
   ========================================================================== */
:root {
  /* Colors - Earth Tone Palette */
  --color-primary: #8B7355;      /* 土色 */
  --color-primary-dark: #6B5344;
  --color-primary-light: #A89078;
  --color-secondary: #4A4A4A;    /* ダークグレー */
  --color-accent: #C4A882;       /* ベージュ */
  --color-white: #FFFFFF;
  --color-off-white: #F8F6F3;
  --color-gray-light: #E8E4E0;
  --color-gray: #9A9A9A;
  --color-text: #333333;
  --color-text-light: #666666;

  /* Typography */
  --font-family-base: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-family-serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 40px;
  --font-size-4xl: 48px;
  --line-height-base: 1.8;
  --line-height-heading: 1.4;
  --letter-spacing-wide: 0.1em;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;
  --spacing-2xl: 80px;
  --spacing-3xl: 120px;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding: 20px;

  /* Transitions */
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

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

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-base);
}

ul, ol {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-serif);
  font-weight: 400;
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-wide);
}

.section-title {
  font-size: var(--font-size-2xl);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 1px;
  background-color: var(--color-primary);
  margin: var(--spacing-sm) auto 0;
}

.section-title-en {
  display: block;
  font-family: var(--font-family-base);
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section--bg {
  background-color: var(--color-off-white);
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition-base);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  padding: 0 var(--spacing-lg);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  z-index: 1001;
}

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

.site-logo-text {
  font-family: var(--font-family-serif);
  font-size: var(--font-size-lg);
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--color-white);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* Menu open state - logo color */
body.menu-open .site-logo-text {
  color: var(--color-text);
  text-shadow: none;
}

/* Menu Toggle - Hamburger */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  z-index: 1001;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  transition: var(--transition-base);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Menu open state - hamburger color */
body.menu-open .menu-toggle span {
  background-color: var(--color-text);
  box-shadow: none;
}

.menu-toggle.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Fullscreen Navigation */
.fullscreen-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.98);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.fullscreen-nav.is-open {
  opacity: 1;
  visibility: visible;
}

.fullscreen-nav-inner {
  text-align: center;
}

.fullscreen-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.fullscreen-nav-list li {
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.fullscreen-nav.is-open .fullscreen-nav-list li {
  opacity: 1;
  transform: translateY(0);
}

.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(1) { transition-delay: 0.1s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(2) { transition-delay: 0.15s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(3) { transition-delay: 0.2s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(4) { transition-delay: 0.25s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(5) { transition-delay: 0.3s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(6) { transition-delay: 0.35s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(7) { transition-delay: 0.4s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(8) { transition-delay: 0.45s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(9) { transition-delay: 0.5s; }
.fullscreen-nav.is-open .fullscreen-nav-list li:nth-child(10) { transition-delay: 0.55s; }

.fullscreen-nav-list a {
  font-family: var(--font-family-serif);
  font-size: 24px;
  letter-spacing: 0.1em;
  color: var(--color-text);
  transition: color 0.3s ease;
}

.fullscreen-nav-list a:hover {
  color: var(--color-primary);
}

/* Body menu open */
body.menu-open {
  overflow: hidden;
}

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 30px;
  height: 30px;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-text);
  transition: var(--transition-base);
}

/* ==========================================================================
   Main Visual (Hero)
   ========================================================================== */
.main-visual {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.mv-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.mv-background img,
.mv-background video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.mv-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.2) 0%,
    rgba(0, 0, 0, 0.4) 100%
  );
}

.mv-content {
  position: relative;
  text-align: center;
  color: var(--color-white);
}

.mv-catchcopy {
  font-family: var(--font-family-serif);
  font-size: var(--font-size-3xl);
  font-weight: 400;
  letter-spacing: 0.15em;
  line-height: 1.6;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.mv-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mv-scroll::after {
  content: "";
  display: block;
  width: 1px;
  height: 40px;
  background-color: var(--color-white);
  margin: var(--spacing-sm) auto 0;
  animation: scrollLine 1.5s infinite;
}

@keyframes scrollLine {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  50% {
    transform: scaleY(1);
    transform-origin: top;
  }
  51% {
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

/* ==========================================================================
   Introduction Section
   ========================================================================== */
.intro-section {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.intro-text {
  font-family: var(--font-family-serif);
  font-size: var(--font-size-lg);
  line-height: 2.2;
  max-width: 700px;
  margin: 0 auto;
}

.intro-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-primary);
  padding-bottom: 4px;
}

.intro-link:hover {
  color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

/* ==========================================================================
   4 Pillars Section
   ========================================================================== */
.pillars-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-off-white);
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.pillar-card {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background-color: var(--color-gray-light);
}

.pillar-card-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: var(--transition-slow);
}

.pillar-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pillar-card:hover .pillar-card-image {
  transform: scale(1.05);
}

.pillar-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.7) 0%,
    rgba(0, 0, 0, 0.2) 50%,
    rgba(0, 0, 0, 0.1) 100%
  );
}

.pillar-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-lg);
  color: var(--color-white);
}

.pillar-card-num {
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  opacity: 0.8;
  margin-bottom: var(--spacing-xs);
}

.pillar-card-title {
  font-family: var(--font-family-serif);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.pillar-card-subtitle {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  line-height: 1.6;
}

.pillar-card-arrow {
  position: absolute;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-base);
}

.pillar-card:hover .pillar-card-arrow {
  background-color: var(--color-white);
  border-color: var(--color-white);
}

.pillar-card:hover .pillar-card-arrow svg {
  stroke: var(--color-text);
}

.pillar-card-arrow svg {
  width: 16px;
  height: 16px;
  stroke: var(--color-white);
  stroke-width: 2;
  fill: none;
}

/* ==========================================================================
   Case Studies Section
   ========================================================================== */
.cases-section {
  padding: var(--spacing-3xl) 0;
}

.cases-slider {
  margin-top: var(--spacing-xl);
}

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

.case-card {
  display: block;
}

.case-card-image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.case-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.case-card:hover .case-card-image img {
  transform: scale(1.05);
}

.case-card-category {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.case-card-title {
  font-size: var(--font-size-base);
  font-weight: 400;
}

.cases-more {
  text-align: center;
  margin-top: var(--spacing-xl);
}

/* ==========================================================================
   News Section
   ========================================================================== */
.news-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-off-white);
}

.news-list {
  max-width: 800px;
  margin: var(--spacing-xl) auto 0;
}

.news-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-gray-light);
}

.news-item:first-child {
  border-top: 1px solid var(--color-gray-light);
}

.news-date {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
  flex-shrink: 0;
  width: 100px;
}

.news-category {
  font-size: var(--font-size-xs);
  color: var(--color-white);
  background-color: var(--color-primary);
  padding: 2px 10px;
  flex-shrink: 0;
}

.news-title {
  font-size: var(--font-size-base);
}

.news-title:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Company Section
   ========================================================================== */
.company-section {
  padding: var(--spacing-3xl) 0;
}

.company-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.company-info dl {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: var(--spacing-sm);
}

.company-info dt {
  font-weight: 500;
  color: var(--color-text-light);
}

.company-info dd {
  color: var(--color-text);
}

.company-map {
  aspect-ratio: 16 / 10;
  background-color: var(--color-gray-light);
}

.company-map iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 14px 32px;
  font-size: var(--font-size-sm);
  letter-spacing: 0.05em;
  border: 1px solid var(--color-text);
  transition: var(--transition-base);
}

.btn:hover {
  background-color: var(--color-text);
  color: var(--color-white);
}

.btn--primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

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

.footer-logo img {
  height: 40px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer-company-name {
  font-family: var(--font-family-serif);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.footer-address {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  opacity: 0.8;
}

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

.footer-nav-title {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
  opacity: 0.6;
}

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

.footer-nav-list a {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

.footer-nav-list a:hover {
  opacity: 1;
  color: var(--color-accent);
}

.footer-bottom {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copyright {
  font-size: var(--font-size-xs);
  opacity: 0.6;
}

.footer-sns {
  display: flex;
  gap: var(--spacing-sm);
}

.footer-sns a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
}

.footer-sns a:hover {
  background-color: var(--color-white);
  border-color: var(--color-white);
}

.footer-sns a:hover svg {
  fill: var(--color-secondary);
}

.footer-sns svg {
  width: 16px;
  height: 16px;
  fill: var(--color-white);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 768px) {
  :root {
    --font-size-3xl: 28px;
    --font-size-2xl: 24px;
    --font-size-xl: 20px;
    --spacing-3xl: 80px;
  }

  .header-inner {
    height: 60px;
    padding: 0 var(--spacing-sm);
  }

  .global-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

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

  .pillar-card {
    aspect-ratio: 16 / 9;
  }

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

  .news-item {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .footer-nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

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

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