/* ==========================================
  Base
========================================== */
:root {
  --color-primary: #0f4c81;
  --color-secondary: #1e3c59;
  --color-accent: #e67e22;
  --color-text: #333;
  --color-text-light: #666;
  --color-bg: #fff;
  --color-bg-light: #f8f9fa;
  --color-border: #e5e5e5;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-en: 'Roboto', sans-serif;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  --container-width: 1200px;
}

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

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

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

/* ==========================================
  Layout
========================================== */
.section {
  padding: 10rem 0;
}

.section__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section__header {
  text-align: center;
  margin-bottom: 6rem;
}

.section__title {
  font-family: var(--font-en);
  font-size: 5rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
  color: var(--color-secondary);
  opacity: 0.7;
}

.section__subtitle {
  font-size: 1.8rem;
  font-weight: 500;
  position: relative;
  display: inline-block;
}

.section__subtitle::after {
  content: '';
  position: absolute;
  bottom: -1rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5rem;
  height: 2px;
  background-color: var(--color-accent);
}

/* ==========================================
  Header
========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 2rem 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  transition: var(--transition);
}

.header.is-scrolled {
  padding: 1rem 0;
  box-shadow: var(--shadow);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.header__logo {
  font-family: var(--font-en);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.header__nav-item {
  font-family: var(--font-en);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.btn-contact {
  display: inline-block;
  padding: 0.8rem 2rem;
  background-color: var(--color-primary);
  color: #fff !important;
  border-radius: 30px;
  font-weight: 700;
  transition: var(--transition);
}

.btn-contact:hover {
  background-color: var(--color-accent);
  transform: translateY(-2px);
}

.header__menu-btn {
  display: none;
  width: 3rem;
  height: 2.5rem;
  position: relative;
  cursor: pointer;
}

.header__menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  position: absolute;
  left: 0;
  transition: var(--transition);
}

.header__menu-btn span:nth-child(1) {
  top: 0;
}

.header__menu-btn span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

.header__menu-btn span:nth-child(3) {
  bottom: 0;
}

.header__menu-btn.is-active span:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}

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

.header__menu-btn.is-active span:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* ==========================================
  Hero
========================================== */
.hero {
  height: 100vh;
  background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
    url('../images/hero.jpg') no-repeat center center / cover;
  display: flex;
  align-items: center;
  position: relative;
}

.hero__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

.hero__content {
  color: #fff;
  max-width: 700px;
}

.hero__title {
  font-size: 4.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 2rem;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero__text {
  font-size: 1.8rem;
  max-width: 600px;
  margin-bottom: 3rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.hero__buttons {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.btn--secondary {
  background-color: rgba(255, 255, 255, 0.8);
  color: var(--color-secondary);
  padding: 1.5rem 4rem;
  border-radius: 50px;
  font-weight: 700;
  transition: var(--transition);
}

.btn--secondary:hover {
  background-color: #fff;
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* ==========================================
  About
========================================== */
.about__items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 4rem;
}

.about__item {
  background-color: var(--color-bg-light);
  padding: 4rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.about__item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.about__item-num {
  font-family: var(--font-en);
  font-size: 5rem;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.3;
  margin-bottom: 2rem;
}

.about__item-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.about__item-text {
  color: var(--color-text-light);
}

.about__more {
  text-align: center;
  margin-top: 4rem;
}

.btn--outline {
  background-color: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  padding: 1.2rem 3rem;
  border-radius: 50px;
  font-weight: 700;
  transition: var(--transition);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* ==========================================
  Service
========================================== */
.service {
  background-color: var(--color-bg-light);
}

.service__items {
  display: flex;
  flex-direction: column;
  gap: 8rem;
}

.service__item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.service__item:nth-child(even) {
  direction: rtl;
}

.service__item:nth-child(even) .service__item-body {
  direction: ltr;
}

.service__item-img {
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.service__item-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.service__item:hover .service__item-img img {
  transform: scale(1.05);
}

.service__item-title {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 2rem;
}

.service__item-text {
  margin-bottom: 2rem;
}

.service__item-link {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.arrow-link {
  display: inline-flex;
  align-items: center;
  font-weight: 500;
  position: relative;
  padding-right: 2.5rem;
}

.arrow-link::after {
  content: '→';
  position: absolute;
  right: 0;
  transition: var(--transition);
}

.arrow-link:hover::after {
  right: -5px;
}

/* ==========================================
  Company
========================================== */
.company__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
}

.company__info-title,
.company__history-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 3rem;
  position: relative;
  padding-left: 1.5rem;
}

.company__info-title::before,
.company__history-title::before {
  content: '';
  position: absolute;
  top: 0.5rem;
  left: 0;
  width: 5px;
  height: 80%;
  background-color: var(--color-primary);
}

.company__info-list {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 2rem 1rem;
}

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

.company__history-items {
  position: relative;
}

.company__history-items::before {
  content: '';
  position: absolute;
  top: 0;
  left: 7px;
  width: 2px;
  height: 100%;
  background-color: #ddd;
}

.company__history-item {
  position: relative;
  padding-left: 3rem;
  margin-bottom: 2rem;
}

.company__history-item::before {
  content: '';
  position: absolute;
  top: 0.6rem;
  left: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-primary);
  z-index: 1;
}

.company__history-date {
  font-family: var(--font-en);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

/* ==========================================
  Culture
========================================== */
.culture {
  background-color: var(--color-bg-light);
}

.culture__lead {
  text-align: center;
  font-size: 2rem;
  max-width: 800px;
  margin: 0 auto 5rem;
}

.culture__items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  margin-bottom: 5rem;
}

.culture__item {
  background-color: #fff;
  padding: 3rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.culture__item:hover {
  transform: translateY(-5px);
}

.culture__item-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.culture__voices-title {
  text-align: center;
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 3rem;
}

.culture__voices-items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.culture__voices-item {
  background-color: #fff;
  padding: 3rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  position: relative;
}

.culture__voices-item::before {
  content: '"';
  position: absolute;
  top: 1rem;
  left: 1.5rem;
  font-size: 5rem;
  color: #eee;
  font-family: serif;
  line-height: 1;
}

.culture__voices-text {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.culture__voices-position {
  text-align: right;
  color: var(--color-text-light);
}

/* ==========================================
  Social
========================================== */
.social__items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
}

.social__item {
  transition: var(--transition);
}

.social__item:hover {
  transform: translateY(-5px);
}

.social__item-img {
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  aspect-ratio: 4/3;
}

.social__item-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.social__item:hover .social__item-img img {
  transform: scale(1.05);
}

.social__item-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.social__item-text {
  color: var(--color-text-light);
}

.social__more {
  text-align: center;
  margin-top: 4rem;
}

/* ==========================================
  Recruit Banner
========================================== */
.recruit-banner {
  background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
    url('../images/recruit_hero.jpg') no-repeat center center / cover;
  color: #fff;
  padding: 8rem 0;
}

.recruit-banner__content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.recruit-banner__title {
  font-size: 3.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  line-height: 1.4;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.recruit-banner__text {
  font-size: 1.8rem;
  margin-bottom: 3rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.btn--large {
  padding: 1.8rem 5rem;
  font-size: 1.8rem;
}

/* More Links */
.company__more,
.culture__more {
  text-align: center;
  margin-top: 4rem;
}

/* ==========================================
  Contact
========================================== */
.contact {
  background-color: var(--color-bg-light);
}

.contact__content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.contact__text {
  margin-bottom: 3rem;
}

.contact__btn {
  margin-bottom: 3rem;
}

.btn {
  display: inline-block;
  padding: 1.5rem 4rem;
  border-radius: 50px;
  font-weight: 700;
  text-align: center;
  transition: var(--transition);
}

.btn--primary {
  background-color: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background-color: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.contact__info {
  font-size: 1.8rem;
}

.contact__tel {
  font-weight: 700;
  margin-bottom: 0.5rem;
}

/* ==========================================
  Footer
========================================== */
.footer__logo .neon-text {
  color: #fff;
  text-shadow: none;
}

.footer {
  background-color: var(--color-secondary);
  color: #fff;
  padding: 5rem 0 2rem;
}

.footer__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5rem;
}

.footer__logo {
  font-family: var(--font-en);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.footer__nav-list {
  display: flex;
  gap: 2rem;
}

.footer__nav-item {
  font-family: var(--font-en);
  font-size: 1.4rem;
  transition: var(--transition);
}

.footer__nav-item a {
  color: #fff;
  opacity: 0.7;
  transition: var(--transition);
}

.footer__nav-item a:hover {
  color: #e67e22;
  opacity: 1;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
}

.footer__copyright {
  font-size: 1.2rem;
  opacity: 0.7;
}

/* ==========================================
  Animations
========================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* ==========================================
  Loading Animation
========================================== */
.loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading.is-loaded {
  opacity: 0;
  visibility: hidden;
}

.loading__logo {
  font-family: var(--font-en);
  font-size: 5rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.3em;
  opacity: 0;
  transform: translateY(20px);
  animation: loadingFadeIn 0.8s ease forwards;
}

@keyframes loadingFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================
  Media Queries
========================================== */
@media (max-width: 991px) {
  html {
    font-size: 60%;
  }

  .section {
    padding: 8rem 0;
  }

  .section__title {
    font-size: 4rem;
  }

  .hero__title {
    font-size: 4rem;
  }

  .company__content {
    grid-template-columns: 1fr;
    gap: 5rem;
  }

  .service__item {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .service__item:nth-child(even) {
    direction: ltr;
  }
}

@media (max-width: 767px) {
  html {
    font-size: 55%;
  }

  .section {
    padding: 6rem 0;
  }

  .section__title {
    font-size: 3.6rem;
  }

  .header__nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(255, 255, 255, 0.98);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    z-index: 999;
  }

  .header__nav.is-active {
    transform: translateY(0);
  }

  .header__nav-list {
    flex-direction: column;
    gap: 2rem;
  }

  .header__nav-item {
    font-size: 2rem;
  }

  .header__menu-btn {
    display: block;
    z-index: 1000;
  }

  .hero__title {
    font-size: 3.6rem;
  }

  .hero__text-wrapper {
    max-width: 90%;
  }

  .hero__text {
    font-size: 1.6rem;
  }
  
  .hero__philosophy {
    font-size: 1.4rem;
  }

  .footer__top {
    flex-direction: column;
    gap: 3rem;
  }

  .footer__nav-list {
    flex-wrap: wrap;
    justify-content: center;
  }
}