/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}
body, h1, h2, h3, p, ul, li, dl, dt, dd {
  margin: 0;
  padding: 0;
}
ul {
  list-style: none;
}
a {
  text-decoration: none;
  color: inherit;
}

/* Base */
body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: #333;
  line-height: 1.7;
  background: #fff;
}

html {
  font-size: 16px;
}

section {
  position: relative;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.3rem;
}

p {
  text-align: justify;
}

/* Header */
.header {
  position: fixed;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #eee;
  z-index: 100;
}
.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.3rem;
}
.header__logo {
  color: #005BAC;
  font-size: 1.3rem;
}
.nav__list {
  display: flex;
  gap: 2rem;
}
.nav__list a {
  font-size: 1rem;
  font-weight: 600;
}

/* FV */
.fv {
  padding: 12rem 0 8rem;
  position: relative;
  overflow: hidden;
  background-image: url("img/fv_bg.webp");
  background-position: center 45%;
  background-size: cover;
  background-repeat: no-repeat;
}
.fv__inner {
  position: relative;
  z-index: 1;
}
.fv__title {
  font-size: 2.6rem;
  font-weight: bold;
  line-height: 1.4;
  color: #005BAC;
}

/* Section */
.section {
  padding: 5.3rem 0;
}
.section--bg {
  background: #f5f9ff;
}
.section__title {
  font-size: 1.6rem;
  color: #005BAC;
  margin-bottom: 1.3rem;
}
.section__text {
  font-size: 1rem;
}

/* Lead */
.lead {
  padding: 3.3rem 0 0;
}

/* Business */
.business {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin-top: 1.3rem;
}
.business__item {
  background: #ffffff;
  border: 1px solid #c8d4e8;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  position: relative;
}
.business__item:nth-child(1) {
  background-image: url("img/business_item_a.webp");
}

.business__item:nth-child(2) {
  background-image: url("img/business_item_b.webp");
}

.business__item:nth-child(3) {
  background-image: url("img/business_item_c.webp");
}

.business__item:nth-child(4) {
  background-image: url("img/business_item_d.webp");
}

.business__item:nth-child(5) {
  background-image: url("img/business_item_e.webp");
}
.business__item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(255, 255, 255, 1) 50%, rgba(255, 255, 255, 0.6) 90%, rgba(255, 255, 255, 0.5) 100%);
}
.business__item > * {
  position: relative;
  z-index: 1;
}
.business__title {
  font-size: 1.2rem;
  font-weight: 600;
  color: #005BAC;
  margin: 1rem 1rem 0.7rem;
}
.business__list {
  font-size: 0.9rem;
  line-height: 1.8;
  color: #555;
  margin: 0 1rem 1.3rem;
}

/* Strength */
.strength {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}
.strength__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #ffffff;
  padding: 2rem 1.3rem;
}
.strength__icon {
  width: 5.3rem;
  height: 5.3rem;
  margin-bottom: 1.3rem;
  object-fit: contain;
}
.strength__title {
  font-size: 1.2rem;
  font-weight: 600;
  color: #005BAC;
  margin-bottom: 0.8rem;
  position: relative;
}
.strength__title::after {
  content: "";
  display: block;
  width: 2rem;
  height: 2px;
  background: #005BAC;
  margin: 0.6rem auto 0;
}
.strength__item p {
  line-height: 1.8;
  max-width: 17rem;
}

/* Message */
.message .section__text p:not(:last-child) {
  margin-bottom: 1.3rem;
}

/* Company */
.company div {
  display: flex;
  gap: 1.3rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid #e3e3e3;
}
.company dt {
  width: 9.3rem;
  font-weight: bold;
}

.company dd {
  flex: 1;
}

/* Contact */
.contact, .contact p {
  text-align: center;
}
.btn {
  display: inline-block;
  margin-top: 1.3rem;
  padding: 0.8rem 2rem;
  background: #005BAC;
  border-radius: 0.7rem;
  color: #fff;
  font-weight: 600;
}

/* Footer */
.footer {
  padding: 1.3rem 0;
  background: #f5f5f5;
  color: #333;
}
.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.3rem;
}
.footer__logo {
  font-size: 1.6rem;
  font-weight: bold;
  color: #005BAC;
}
.footer__nav {
  display: flex;
  gap: 1.3rem;
}
.footer__copy {
  text-align: center;
  font-size: 0.9rem;
  color: #777;
}

/* Responsive */
@media (max-width: 1023px) {
  .container {
    max-width: 720px;
    padding: 0 2rem;
  }
  .section {
    padding: 3rem 0;
  }
  .section__title {
    font-size: 1.5rem;
  }
  .fv::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.5) 60%, rgba(255, 255, 255, 0) 100%);
  }
  .fv__title {
    font-size: 2.4rem;
  }
  .lead {
    padding: 3rem 0 1rem;
  }
  .business {
    grid-template-columns: repeat(2, 1fr);
  }
  .business__item {
    padding-right: 6rem;
  }
  .strength {
    grid-template-columns: 1fr 1fr;
  }
  .footer__top {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

@media (max-width: 743px) {
  html {
    font-size: 4vw;
  }
  .container {
    padding: 0 1rem;
  }
  .header__inner {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }
  .nav__list {
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.1rem 1rem;
  }
  .fv {
    padding: 13rem 0 4rem;
  }
  .fv::before {
    background: linear-gradient(to right, rgba(255, 255, 255, 0.7) 70%, rgba(255, 255, 255, 0) 100%);
  }
  .fv__title {
    font-size: 1.8rem;
  }
  .section {
    padding: 2rem 0;
  }
  .section__title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
  }
  .lead {
    padding: 2rem 0 1rem;
  }
  .business {
    grid-template-columns: 1fr;
  }
  .strength {
    grid-template-columns: 1fr;
  }
  .strength__icon {
    width: 5rem;
    height: 5rem;
  }
  .strength__item p {
    max-width: initial;
  }
  .message .section__text p:not(:last-child) {
    margin-bottom: 1rem;
  }
  .company dt {
    width: 5rem;
  }
  .contact p {
    text-align: justify;
  }
  .footer__top {
    flex-direction: column;
    gap: 1rem;
  }
  .footer__nav {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 0.3rem 1.5rem;
  }
}