:root {
  --bg: #ffffff;
  --text-main: #0f2858;
  --text-sub: #4a5f89;
  --line: #e7ecf3;
  --accent: #1f5fb7;
  --accent-strong: #164d9b;
  --contact-shadow: 0 10px 20px rgba(17, 65, 137, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  color: var(--text-main);
  background: var(--bg);
}

.top-line {
  height: 5px;
  background: #10141c;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.container {
  width: min(1220px, calc(100% - 48px));
  margin-inline: auto;
}

.nav-wrap {
  min-height: 84px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 22px;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1;
  white-space: nowrap;
}

.brand-ja {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand-en {
  font-family: "Montserrat", sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: #1d315a;
}

.global-nav {
  justify-self: center;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.1vw, 36px);
}

.nav-list a {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: #0d214e;
  transition: color 0.25s ease;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  position: relative;
}

.nav-list a.is-current,
.nav-list a:hover {
  color: var(--accent);
}

.nav-list a.is-current::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 76px;
  height: 3px;
  border-radius: 999px;
  background: #3381de;
  bottom: -32px;
}

.nav-list .sub {
  font-family: "Montserrat", sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn-contact {
  min-width: 136px;
  height: 46px;
  padding: 0 14px;
  border-radius: 8px;
  background: linear-gradient(180deg, #2569c8 0%, #1958ae 100%);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-size: 11px;
  font-weight: 700;
  box-shadow: var(--contact-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.btn-contact:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 24px rgba(17, 65, 137, 0.26);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  line-height: 1;
}

.tel {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #123066;
}

.tel-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  line-height: 1;
}

.tel-body {
  display: inline-flex;
  flex-direction: column;
  line-height: 1;
}

.tel-body strong {
  font-family: "Montserrat", sans-serif;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tel-body small {
  margin-top: 5px;
  font-size: 10px;
  font-weight: 600;
}

.menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  background: transparent;
  border: 0;
  padding: 6px;
  margin-left: auto;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background: #123066;
  margin: 4px 0;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.fv {
  position: relative;
  min-height: 670px;
  overflow: hidden;
}

.fv-bg {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.86) 0%, rgba(255, 255, 255, 0.67) 29%, rgba(255, 255, 255, 0.08) 57%, rgba(10, 16, 32, 0.2) 100%), url("../img/FV.png");
  background-size: cover;
  background-position: center top;
}

.fv-inner {
  position: relative;
  z-index: 1;
  min-height: 670px;
  display: flex;
  align-items: flex-start;
}

.fv-copy {
  max-width: 570px;
  padding-top: 92px;
}

.fv-brand {
  margin: 0 0 22px;
  color: #1851ab;
  line-height: 1;
}

.fv-brand-main {
  display: block;
  font-family: "Montserrat", sans-serif;
  font-size: 56px;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.fv-brand-sub {
  display: inline-block;
  margin-top: 9px;
  font-family: "Montserrat", sans-serif;
  font-size: 17px;
  letter-spacing: 0.17em;
  font-weight: 600;
  border-top: 3px solid #2e76cf;
  padding-top: 11px;
}

.fv-copy h1 {
  margin: 0;
  font-size: 52px;
  line-height: 1.26;
  letter-spacing: 0.03em;
  color: #0e234f;
}

.fv-lead {
  margin: 28px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: #1b2f55;
  font-weight: 500;
}

.fv-actions {
  margin-top: 24px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.fv-btn {
  min-width: 242px;
  min-height: 58px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.fv-btn.is-primary {
  background: #1e62c2;
  color: #fff;
  box-shadow: 0 10px 22px rgba(22, 74, 150, 0.28);
}

.fv-btn.is-secondary {
  background: rgba(255, 255, 255, 0.86);
  color: #1b4d98;
  border: 2px solid #87aee3;
}

.fv-btn:hover {
  transform: translateY(-2px);
}

.intro-strip {
  position: relative;
  background: #ffffff;
  overflow: hidden;
  border-top: 1px solid #edf1f7;
  border-bottom: 1px solid #edf1f7;
}

.intro-strip__left,
.intro-strip__right {
  position: absolute;
  top: 0;
  width: min(30vw, 430px);
  height: 100%;
  pointer-events: none;
  background-size: cover;
  background-position: center;
  opacity: 0.5;
}

/* Unsplash images are free to use under the Unsplash License. */
.intro-strip__left {
  left: 0;
  background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.88) 100%), url("https://images.unsplash.com/photo-1580674285054-bed31e145f59?auto=format&fit=crop&w=1200&q=80");
}

.intro-strip__right {
  right: 0;
  background-image: linear-gradient(270deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.9) 100%), url("https://images.unsplash.com/photo-1477959858617-67f85cf4f1df?auto=format&fit=crop&w=1200&q=80");
}

.intro-strip__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 34px 20px 32px;
}

.intro-strip__inner h2 {
  margin: 0;
  font-size: 38px;
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: #102654;
}

.intro-strip__inner p {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 2;
  font-weight: 700;
  color: #252f3f;
}

.biz {
  padding: 42px 0 26px;
  background: #fff;
}

.sec-title {
  margin: 0;
  text-align: center;
  font-size: 40px;
  color: #112a57;
  letter-spacing: 0.05em;
  line-height: 1.2;
}

.sec-title::after {
  content: "";
  display: block;
  width: 42px;
  height: 4px;
  border-radius: 999px;
  background: #3b84de;
  margin: 10px auto 0;
}

.biz-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.biz-card {
  border-radius: 8px;
  overflow: hidden;
  min-height: 444px;
  position: relative;
  border: 1px solid #dfe7f1;
}

.biz-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.biz-card::after {
  content: "";
  position: absolute;
  inset: 0;
}

.biz-card--drone::before {
  background-image: url("../img/dronelogo.png");
}

.biz-card--steel::before {
  background-image: url("../img/steelmain.jpg");
}

.biz-card--drone::after {
  background: linear-gradient(90deg, rgba(18, 61, 130, 0.76) 0%, rgba(18, 70, 146, 0.46) 57%, rgba(18, 61, 130, 0.38) 100%);
}

.biz-card--steel::after {
  background: linear-gradient(90deg, rgba(20, 20, 24, 0.78) 0%, rgba(20, 20, 24, 0.55) 55%, rgba(20, 20, 24, 0.34) 100%);
}

.biz-card__content {
  position: relative;
  z-index: 1;
  padding: 24px 20px 16px;
  color: #fff;
}

.biz-card__label {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
}

.biz-card__label::after {
  content: "";
  display: block;
  width: 128px;
  height: 2px;
  background: rgba(255, 255, 255, 0.32);
  margin-top: 8px;
}

.biz-card h3 {
  margin: 10px 0 0;
  font-size: 42px;
  letter-spacing: 0.03em;
  line-height: 1.1;
}

.biz-card__lead {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  font-weight: 700;
}

.biz-icons {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.biz-icons li {
  background: rgba(255, 255, 255, 0.92);
  color: #12397a;
  border-radius: 4px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.biz-card__cta {
  margin: 18px auto 0;
  max-width: 290px;
  height: 56px;
  background: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #1d56ab;
  font-size: 16px;
  font-weight: 700;
  border: 1px solid #d4deec;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.biz-card__cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(13, 45, 95, 0.2);
}

.strengths {
  background: #fff;
  padding: 34px 0 42px;
}

.sec-title--strengths {
  font-size: 40px;
}

.strengths-grid {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
}

.strengths-grid li {
  text-align: center;
  color: #182948;
}

.strengths-icon {
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #2c69c8;
}

.strengths-icon svg {
  width: 100%;
  height: 100%;
}

.strengths-grid h3 {
  margin: 12px 0 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: #0f2858;
}

.strengths-grid p {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.45;
  font-weight: 700;
  color: #3d4d69;
}

.message {
  background: #ffffff;
  padding: 60px 0;
}

.message__inner {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 48px;
}

.message__photo {
  flex: 0 0 55%;
  max-width: 55%;
}

.message__photo img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.message__body {
  flex: 1;
  padding: 0;
  background-color: transparent;
  border-radius: 0;
  box-shadow: none;
  text-align: left;
  line-height: 1.8;
}

.message__body h2 {
  margin: 0 0 16px;
  color: #12306a;
  font-size: 28px;
  line-height: 1.3;
}

.message__catch {
  font-size: 15px;
  font-weight: 700;
  color: #1f5fb7;
  margin: 0 0 20px;
  line-height: 1.6;
}

.message__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: #2d3a54;
  font-weight: 400;
}

.message__sign {
  margin-top: 24px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: 700;
  text-align: right;
  color: #12306a;
}

.message__btn {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-width: 184px;
  height: 48px;
  border-radius: 8px;
  border: 2px solid #8cb0e2;
  color: #1f57ac;
  font-size: 15px;
  font-weight: 700;
}

.news {
  background: #fff;
  padding: 64px 0 80px;
}

.news__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 840px;
  margin: 0 auto;
}

.sec-title--news {
  font-size: 40px;
  margin: 0;
}

.news__more {
  flex-shrink: 0;
  width: 160px;
  height: 46px;
  border: 2px solid #7da7df;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: #1e56ab;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.news__more:hover {
  background: #1e62c2;
  color: #fff;
}

.news__grid {
  margin-top: 36px;
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
}

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

.news-list li {
  display: grid;
  grid-template-columns: 130px 120px 1fr;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid #edf1f6;
}

.news-list li:first-child {
  border-top: 1px solid #edf1f6;
}

.news-list time {
  font-family: "Montserrat", sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: #1e355f;
  white-space: nowrap;
}

.news-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 12px;
  border-radius: 6px;
  border: 1.5px solid #aac3e9;
  background: #f0f6ff;
  color: #1f57ac;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.news-list a {
  color: #2b2f39;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  text-decoration: none;
  transition: color 0.2s ease;
}

.news-list a:hover {
  color: #1e62c2;
  text-decoration: underline;
}

.site-footer {
  background: #fff;
}

.footer-cta {
  background: linear-gradient(90deg, #0f4ba4 0%, #0d3f8d 52%, #0f4ba4 100%);
}

.footer-cta__inner {
  min-height: 167px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.9fr;
  align-items: center;
  gap: 30px;
}

.footer-cta__lead {
  color: #fff;
}

.footer-cta__title {
  margin: 0;
  font-size: 24px;
  line-height: 1.25;
  letter-spacing: 0.03em;
  font-weight: 700;
}

.footer-cta__text {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: #cbdcf6;
  font-weight: 700;
}

.footer-cta__tel {
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0 8px 4px;
  border-left: 1px solid rgba(198, 217, 245, 0.35);
  padding-left: 34px;
}

.footer-cta__tel-icon {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.footer-cta__tel-icon svg {
  width: 100%;
  height: 100%;
}

.footer-cta__tel-body {
  display: inline-flex;
  flex-direction: column;
  line-height: 1;
}

.footer-cta__tel-body strong {
  font-family: "Montserrat", sans-serif;
  font-size: 46px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.footer-cta__tel-body small {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 700;
  color: #d0e0f7;
}

.footer-cta__btn {
  justify-self: end;
  width: min(100%, 308px);
  height: 60px;
  border-radius: 9px;
  background: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: #1f57ac;
  font-size: 16px;
  font-weight: 700;
  border: 1px solid #d6e1f2;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.footer-cta__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.2);
}

@media (max-width: 1540px) {
  .brand-ja {
    font-size: clamp(16px, 1.35vw, 20px);
  }

  .brand-en {
    font-size: clamp(8px, 0.6vw, 9px);
  }

  .nav-list a {
    font-size: clamp(13px, 1vw, 15px);
  }

  .btn-contact {
    font-size: clamp(10px, 0.8vw, 11px);
    min-width: clamp(124px, 10.8vw, 136px);
    height: clamp(42px, 3.5vw, 46px);
  }

  .tel-body strong {
    font-size: clamp(19px, 1.55vw, 24px);
  }

  .tel-body small {
    font-size: clamp(9px, 0.7vw, 10px);
  }

  .fv {
    min-height: min(66vw, 670px);
  }

  .fv-inner {
    min-height: min(66vw, 670px);
  }

  .fv-copy {
    max-width: 560px;
    padding-top: clamp(58px, 5.8vw, 92px);
  }

  .fv-copy h1 {
    font-size: clamp(40px, 4vw, 52px);
  }

  .fv-lead {
    font-size: clamp(14px, 1.1vw, 15px);
    line-height: 1.9;
  }

  .fv-btn {
    min-width: clamp(220px, 20vw, 242px);
    min-height: clamp(56px, 4.7vw, 64px);
    font-size: clamp(14px, 1.1vw, 16px);
  }

  .intro-strip__inner h2 {
    font-size: clamp(30px, 2.6vw, 38px);
  }

  .sec-title {
    font-size: clamp(28px, 2.7vw, 40px);
  }

  .sec-title--strengths {
    font-size: clamp(28px, 2.6vw, 40px);
  }

  .sec-title--news {
    font-size: clamp(28px, 2.6vw, 40px);
  }

  .biz-card h3 {
    font-size: clamp(30px, 2.8vw, 42px);
  }

  .biz-icons li {
    font-size: 12px;
    padding: 6px 13px;
  }

  .strengths-grid h3 {
    font-size: clamp(15px, 1.2vw, 18px);
  }

  .strengths-grid p {
    font-size: clamp(11px, 0.85vw, 13px);
  }

  .footer-cta__btn {
    font-size: clamp(14px, 1.1vw, 16px);
    height: clamp(52px, 4vw, 60px);
  }
}

@media (max-width: 768px) {
  .news-list li {
    grid-template-columns: 1fr;
    gap: 6px;
    align-items: start;
    padding: 14px 0;
  }

  .news__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    max-width: 100%;
  }

  .news__grid {
    max-width: 100%;
  }

  .news-list time {
    font-size: 12px;
  }

  .news-tag {
    width: fit-content;
  }

  .news-list a {
    font-size: 13px;
    line-height: 1.6;
  }

  .message__inner {
    flex-direction: column;
    gap: 24px;
  }

  .message__photo {
    flex: none;
    max-width: 100%;
    width: 100%;
  }

  .message__photo img {
    height: auto;
  }

  .message__body {
    max-width: 100%;
  }

  .message__body h2 {
    font-size: 24px;
  }

  .message__body p {
    font-size: 13px;
    line-height: 1.8;
  }

  .message__btn {
    min-width: 160px;
    height: 44px;
    font-size: 13px;
  }

  .footer-cta__title {
    font-size: 26px;
  }

  .footer-cta__text {
    margin-top: 8px;
    font-size: 13px;
  }

  .footer-cta__tel {
    gap: 8px;
  }

  .footer-cta__tel-icon {
    width: 22px;
    height: 22px;
  }

  .footer-cta__tel-body strong {
    font-size: 36px;
  }

  .footer-cta__tel-body small {
    font-size: 12px;
  }
}

/* ===== 1080px以下: ハンバーガーメニュー（右ドロワー） ===== */
@media (max-width: 1080px) {
  .container {
    width: calc(100% - 40px);
  }

  .nav-wrap {
    min-height: 64px;
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  /* ヘッダーをドロワーより手前に固定 */
  .site-header {
    position: relative;
    z-index: 201;
  }

  /* ドロワー本体：右からスライドイン */
  .global-nav {
    display: block;
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100dvh;
    background: linear-gradient(160deg, #0d214e 0%, #0a1a3c 100%);
    z-index: 200;
    overflow-y: auto;
    transform: translateX(110%);
    transition: transform 0.36s cubic-bezier(0.4, 0, 0.2, 1),
                visibility 0.36s;
    visibility: hidden;
    box-shadow: -8px 0 48px rgba(8, 18, 50, 0.4);
    padding-top: 80px;
  }

  .global-nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  /* オーバーレイ（ドロワー外クリックで閉じる） */
  body.menu-open::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(5, 15, 40, 0.55);
    z-index: 199;
    backdrop-filter: blur(3px);
  }

  /* ナビリスト */
  .nav-list {
    flex-direction: column;
    gap: 0;
    width: 100%;
    padding: 8px 0 40px;
    text-align: left;
  }

  .nav-list li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  }

  .nav-list li:first-child {
    border-top: 1px solid rgba(255, 255, 255, 0.07);
  }

  .nav-list a {
    color: rgba(255, 255, 255, 0.78);
    font-size: 14px;
    font-weight: 600;
    padding: 16px 24px;
    width: 100%;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    gap: 10px;
    letter-spacing: 0.06em;
    transition: color 0.2s ease, background 0.2s ease, padding-left 0.2s ease;
    border-left: 3px solid transparent;
  }

  /* デフォルトの下線 ::after を無効化 */
  .nav-list a::after {
    content: none;
  }

  .nav-list a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.07);
    padding-left: 30px;
    border-left-color: rgba(100, 160, 255, 0.5);
  }

  .nav-list a.is-current {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border-left-color: #5aaeff;
    padding-left: 28px;
  }

  .nav-list a.is-current::after {
    content: none;
  }

  .nav-list .sub {
    color: rgba(255, 255, 255, 0.45);
    font-size: 9px;
    letter-spacing: 0.15em;
  }

  /* nav-cta（電話・お問い合わせボタン）を非表示 */
  .nav-cta {
    display: none;
  }

  /* ハンバーガーボタン表示 */
  .menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 210;
  }

  /* X ボタンアニメーション（メニュー開時） */
  .menu-open .menu-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

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

  .menu-open .menu-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* メニューオープン中はbodyスクロール禁止 */
  body.menu-open {
    overflow: hidden;
  }
}

/* ===== 768px以下: スマホ追加調整 ===== */
@media (max-width: 768px) {
  .container {
    width: calc(100% - 32px);
  }

  /* ヘッダー */
  .brand-ja {
    font-size: 15px;
  }

  .brand-en {
    font-size: 8px;
  }

  /* FV */
  .fv {
    min-height: 480px;
  }

  .fv-inner {
    min-height: 480px;
    align-items: flex-end;
    padding-bottom: 48px;
  }

  .fv-copy {
    max-width: 100%;
    padding-top: 0;
  }

  .fv-brand-main {
    font-size: 36px;
  }

  .fv-brand-sub {
    font-size: 13px;
    margin-top: 6px;
    padding-top: 8px;
  }

  .fv-copy h1 {
    font-size: 28px;
    line-height: 1.4;
  }

  .fv-lead {
    font-size: 12px;
    margin-top: 16px;
    line-height: 1.8;
  }

  .fv-actions {
    flex-direction: column;
    gap: 12px;
    margin-top: 20px;
  }

  .fv-btn {
    min-width: 0;
    width: 100%;
    min-height: 52px;
    font-size: 14px;
  }

  /* セクション共通 */
  .sec-title {
    font-size: 26px;
  }

  /* 会社紹介帯 */
  .intro-strip__inner h2 {
    font-size: 20px;
    letter-spacing: 0.02em;
  }

  .intro-strip__inner p {
    font-size: 13px;
    line-height: 1.75;
    margin-top: 14px;
  }

  .intro-strip__left,
  .intro-strip__right {
    display: none;
  }

  /* 事業紹介 */
  .biz {
    padding: 36px 0 28px;
  }

  .biz-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 20px;
  }

  .biz-card {
    min-height: 300px;
  }

  .biz-card h3 {
    font-size: 32px;
    margin-top: 8px;
  }

  .biz-card__lead {
    font-size: 13px;
    margin-top: 12px;
  }

  .biz-card__cta {
    max-width: 100%;
    margin-top: 16px;
    height: 50px;
    font-size: 14px;
  }

  /* 栄宏鋼材の強み */
  .strengths {
    padding: 36px 0;
  }

  .strengths-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px 12px;
    margin-top: 20px;
  }

  .strengths-icon {
    width: 44px;
    height: 44px;
  }

  .strengths-grid h3 {
    font-size: 13px;
    margin-top: 10px;
  }

  .strengths-grid p {
    font-size: 11px;
    margin-top: 4px;
    line-height: 1.5;
  }

  /* メッセージ */
  .message {
    padding: 48px 0;
  }

  /* お知らせ */
  .news {
    padding: 48px 0 60px;
  }

  /* フッター */
  .footer-cta__inner {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 40px 0;
    gap: 28px;
  }

  .footer-cta__lead {
    text-align: center;
  }

  .footer-cta__title {
    font-size: 20px;
  }

  .footer-cta__text {
    font-size: 12px;
  }

  .footer-cta__tel {
    border-left: none;
    padding-left: 0;
    justify-content: center;
    border-top: 1px solid rgba(198, 217, 245, 0.3);
    padding-top: 24px;
    gap: 12px;
  }

  .footer-cta__tel-body strong {
    font-size: 30px;
  }

  .footer-cta__tel-body small {
    font-size: 11px;
  }

  .footer-cta__btn {
    justify-self: center;
    width: 100%;
    max-width: 320px;
    height: 54px;
    font-size: 15px;
  }
}