/* Base Styles */
:root {
  --primary-color: #795548;
  --secondary-color: #00a651;
  --dark-color: #333;
  --light-color: #f4f4f4;
  --white-color: #fff;
  --grey-color: #e6e6e6;
  --text-color: #444;
  --border-color: #ddd;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Noto Sans JP', 'Noto Sans SC', 'Noto Sans', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
}

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

a:hover {
  color: var(--primary-color);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Section Styles */
.section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  margin-bottom: 40px;
  color: var(--dark-color);
  position: relative;
  padding-bottom: 15px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--primary-color);
}

.bg-light {
  background-color: var(--light-color);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--white-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: normal;
  padding: 15px 20px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 50px;
  margin-right: 10px;
}

.company-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--dark-color);
}

nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
}

.nav-links li {
  margin-left: 25px;
}

.nav-links a {
  font-weight: 500;
}

.language-selector {
  margin-right: 20px;
  display: flex;
}

.language-selector button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px 10px;
  font-size: 0.9rem;
  border-radius: 3px;
  transition: var(--transition);
}

.language-selector button.active {
  background-color: var(--primary-color);
  color: var(--white-color);
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Banner Section */
.banner {
  height: 100vh;
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../images/banner.jpg') no-repeat center center/cover;
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--white-color);
  margin-top: 80px;
}

.banner-content {
  max-width: 800px;
  margin: 0 auto;
}

.banner-content h2 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.banner-content p {
  font-size: 1.2rem;
  margin-bottom: 30px;
}

.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: var(--white-color);
  padding: 12px 25px;
  border-radius: 5px;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn:hover {
  background-color: #005a9e;
  color: var(--white-color);
}

.btn-small {
  padding: 8px 15px;
  font-size: 0.9rem;
}

.contact-form .btn i {
  display: none;
}

.contact-form .btn.disabled {
  pointer-events: none;
  opacity: 0.5;
}

.contact-form .btn.disabled i {
  display: inline-block;
}

/* About Section */
.about-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.about-text {
  flex: 0 0 60%;
}

.about-text p {
  margin-bottom: 20px;
}

.about-info {
  flex: 0 0 35%;
  background-color: var(--light-color);
  padding: 20px;
  border-radius: 5px;
}

.info-item {
  margin-bottom: 15px;
}

.info-item h3 {
  font-size: 1.1rem;
  margin-bottom: 5px;
  color: var(--primary-color);
  padding-right: 8px;
}

/* Services Section */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.service-card {
  background-color: var(--white-color);
  padding: 30px;
  border-radius: 5px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.service-card i {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.service-card h3 {
  margin-bottom: 15px;
  color: var(--dark-color);
}

/* Products Section */
.products-tabs {
  margin-top: 40px;
}

.tabs-nav {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  padding: 10px 20px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  margin-right: 5px;
  transition: var(--transition);
}

.tab-btn.active {
  border-bottom: 3px solid var(--primary-color);
  color: var(--primary-color);
}

.tab-panel {
  display: none;
}

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

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 30px;
}

.product-item {
  background-color: var(--white-color);
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.product-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.product-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.product-item h3 {
  padding: 15px 15px 10px;
  color: var(--dark-color);
}

.product-item p {
  padding: 0 15px 15px;
  font-size: 0.9rem;
}

/* Partners Section */
.partners-content {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.partner-item {
  background-color: var(--white-color);
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.partner-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.partner-item h3 {
  padding: 15px 15px 10px;
}

.partner-item p {
  padding: 0 15px 15px;
  font-size: 0.9rem;
  margin-bottom: 15px;
}

.partner-item .btn {
  margin: 0 15px 15px;
}

/* Contact Section */
.contact-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.contact-info {
  flex: 0 0 35%;
}

.contact-info .info-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 30px;
}

.contact-info .info-item i {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin-right: 8px;
  margin-top: 5px;
  width: 14px;
}

.contact-form {
  flex: 0 0 60%;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
}

.form-group textarea {
  resize: vertical;
}

/* Footer */
footer {
  background-color: var(--dark-color);
  color: var(--white-color);
  padding: 60px 0 20px;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-bottom: 40px;
}

.footer-logo {
  flex: 0 0 30%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-logo img {
  height: 90px;
  margin-bottom: 15px;
}

.footer-logo h2 {
  font-size: 1.2rem;
}

.footer-links {
  flex: 0 0 20%;
}

.footer-links h3 {
  margin-bottom: 20px;
  font-size: 1.2rem;
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #aaa;
}

.footer-links a:hover {
  color: var(--white-color);
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: #aaa;
}