@media (max-width: 991.98px) {
  .site-header {
    color: var(--color-text);
    background: rgba(255, 255, 255, .96);
    border-color: var(--color-border);
  }

  .navbar-collapse {
    padding: .75rem 0 1rem;
    border-top: 1px solid var(--color-border);
  }

  .navbar-toggler {
    flex: 0 0 44px;
    margin-left: auto;
  }

  .navbar-nav { gap: 0; }
  .nav-link { padding: .9rem 0; }
  .nav-link::after { display: none; }

  .hero { min-height: 560px; }
  .hero-body { padding-bottom: 56px; }
  .section { padding: 70px 0; }

  .split-rule,
  .brand-block,
  .brand-block:nth-child(even),
  .design-b .brand-stage {
    grid-template-columns: 1fr;
  }

  .brand-block:nth-child(even) .brand-copy { order: 0; }
  .service-row,
  .news-item {
    grid-template-columns: 1fr;
    gap: .9rem;
  }

  .design-b .brand-feature { min-height: 470px; }
  .design-b .hero {
    min-height: 610px;
  }
  .design-b .hero-image {
    width: 58%;
    height: 64%;
  }
  .design-b .hero--mainv .hero-image {
    width: 100%;
    height: 100%;
  }
  .design-b .brand-stage {
    width: calc(100% - 40px);
  }
  .design-b .brand-feature {
    grid-template-rows: 320px auto;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }
  .design-b .b-business-list article {
    grid-template-columns: 1fr;
    gap: .9rem;
  }
  .design-b .b-business-list h3 {
    white-space: normal;
  }
  .design-b .b-news-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .mission-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .service-feature-grid,
  .arco-gallery {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .history-entry {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .design-b .brand-feature:last-child {
    border-bottom: 0;
  }
  .design-c .hero-image {
    left: 0;
    width: 100%;
    opacity: .28;
  }
}

@media (max-width: 767.98px) {
  .container { padding-right: 1.15rem; padding-left: 1.15rem; }
  .site-logo { min-width: 205px; font-size: .82rem; }
  .site-logo-mark { width: 196px; }
  .hero { min-height: 500px; }
  .hero-title { font-size: clamp(.9rem, 3.8vw, 2.55rem); }
  .hero-copy { margin-top: .72rem; font-size: .76rem; line-height: 1.45; }
  .hero-mind-section {
    margin-top: -42px;
    padding: 0 0 54px;
  }
  .hero-mind-panel {
    display: block;
    padding: 34px 26px 38px;
  }
  .hero-mind-label {
    margin-bottom: 22px;
    font-size: clamp(3.6rem, 18vw, 5.8rem);
    line-height: .86;
  }
  .hero-mind-section .hero-title {
    max-width: 100%;
    font-size: clamp(1rem, 5vw, 1.55rem);
    line-height: 1.22;
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .hero-mind-section .hero-copy { margin-top: .72rem; font-size: .76rem; }
  .section { padding: 58px 0; }
  .section-title { font-size: clamp(.86rem, 3.8vw, 1.95rem); }
  .section-lead { font-size: .8rem; line-height: 1.8; }
  .section-more-wrap { margin-top: 24px; }
  .section-more::after { width: 32px; }
  .section-more:hover::after { width: 44px; }
  .btn-outline,
  .btn-dark { min-height: 34px; padding: .46rem .9rem; font-size: .74rem; }
  .split-rule { gap: 24px; padding-top: 30px; padding-bottom: 30px; }
  .lower-hero { min-height: 300px; }
  .lower-hero::after { background: linear-gradient(180deg, rgba(255, 255, 255, .42), rgba(255, 255, 255, .86)); }
  .lower-hero-body { padding-bottom: 34px; }
  .company-lead { font-size: .84rem; line-height: 1.75; }
  .sp-no-break {
    display: none;
  }
  .sp-only {
    display: block;
  }
  .mission-grid { grid-template-columns: 1fr; }
  .mission-grid article { min-height: 0; padding: 24px; }
  .service-card {
    display: block;
    grid-template-rows: none;
    overflow: hidden;
  }
  .service-card > img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }
  .service-card > div {
    position: relative;
    z-index: 1;
    padding: 26px;
    background: var(--color-white);
  }
  .business-page .service-feature-grid .service-card {
    display: flex;
    flex-direction: column;
  }
  .business-page .service-feature-grid .service-card > img {
    flex: 0 0 auto;
    height: auto;
    aspect-ratio: 16 / 9;
  }
  .business-page .service-feature-grid .service-card > div {
    position: static;
    z-index: auto;
  }
  .arco-copy dl div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .history-entry {
    padding: 34px 0;
  }
  .history-media {
    grid-template-columns: 1fr;
  }
  .recruit-job {
    padding: 26px 22px;
  }
  .recruit-job-head {
    flex-direction: column;
    gap: 8px;
  }
  .recruit-detail-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .profile-table div {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px 0;
  }
  .news-detail-title {
    margin-bottom: 30px;
    padding-bottom: 22px;
  }
  .news-detail-body {
    font-size: .84rem;
    line-height: 1.8;
  }
  .news-detail-info div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .news-detail-nav {
    margin-top: 40px;
  }
  .contact-form {
    padding: 26px 22px;
  }
  .contact-field-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .contact-submit {
    justify-content: stretch;
  }
  .contact-submit .btn {
    width: 100%;
  }
  .contact-agree p {
    margin-left: 0;
  }
  .stat-list { grid-template-columns: 1fr; }
  .stat-item { min-height: 104px; padding: 24px; }
  .brand-block { gap: 28px; padding: 46px 0; }
  .design-b .b-news-list {
    grid-template-columns: 1fr;
  }
  .design-b .b-news-link {
    display: block;
    min-height: 0;
    padding: 22px;
  }
  .design-b .b-news-thumb {
    width: 100%;
    min-height: 0;
    margin-bottom: 18px;
  }
  .brand-logo { font-size: clamp(1.05rem, 5.4vw, 2.3rem); }
  .brand-logo-image { height: 58px; }
  .brand-logo-image img { height: 46px; }
  .service-brand-logo { height: 58px; }
  .service-brand-logo img {
    width: auto;
    height: 46px;
    aspect-ratio: auto;
    object-fit: contain;
  }
  .design-b .brand-feature .brand-logo-image img {
    max-width: 240px;
    height: 46px;
  }
  .service-feature-grid .service-card .service-brand-logo img {
    width: auto;
    max-width: 240px;
    height: 52px;
    aspect-ratio: auto;
    object-fit: contain;
  }
  .design-a .concept-panel,
  .design-b .concept-panel { margin-top: 0; padding: 32px 24px; border-right: 0; border-left: 0; }
  .design-a .recruit-panel { padding: 32px 24px; }
  .design-b .hero { min-height: 540px; }
  .design-b .hero-image {
    top: auto;
    right: 0;
    bottom: 0;
    width: 78%;
    height: 50%;
    opacity: .38;
  }
  .design-b .hero--mainv {
    min-height: 540px;
  }
  .design-b .hero--mainv .hero-image {
    top: 0;
    right: auto;
    bottom: auto;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 1;
  }
  .design-b .hero-body {
    padding: 124px 0 58px;
    text-align: left;
  }
  .design-b .hero--mainv .hero-body {
    padding: 0 0 58px;
  }
  .design-b .hero-title {
    max-width: 9em;
    font-size: clamp(1.52rem, 8.1vw, 2.38rem);
    line-height: 1.03;
    overflow-wrap: normal;
    white-space: normal;
    word-break: keep-all;
  }
  .design-b .hero--mainv .hero-title {
    max-width: none;
    font-size: clamp(1.35rem, 6.1vw, 2.05rem);
    line-height: 1.08;
    white-space: normal;
  }
  .design-b .hero-mind-section {
    padding-bottom: 34px;
  }
  .design-b .hero-mind-section .hero-title {
    max-width: 100%;
    font-size: clamp(.94rem, 4.45vw, 1.32rem);
    line-height: 1.32;
    overflow-wrap: anywhere;
    word-break: normal;
  }
  .design-b .company-mind--message .hero-title {
    max-width: 100%;
    font-size: clamp(.94rem, 4.45vw, 1.32rem);
    line-height: 1.32;
    overflow-wrap: anywhere;
    word-break: normal;
  }
  .design-b .company-mind--message .hero-copy {
    margin-top: .72rem;
    font-size: .76rem;
  }
  .design-b #brands {
    padding-top: 42px;
  }
  .design-b .brand-stage {
    width: calc(100% - 28px);
    margin-top: 38px;
  }
  .design-b .brand-feature {
    min-height: 0;
    padding: 0;
    grid-template-rows: auto auto;
  }
  .design-b .brand-feature-content {
    padding: 28px;
  }
  .design-b .value-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .design-b .b-business-list article {
    padding: 24px 0;
  }
  .timeline-item { grid-template-columns: 1fr; gap: 12px; padding: 26px 0; }
  .timeline-year { font-size: 1.5rem; }
  .design-c .brand-block { padding: 30px; }
  .site-footer {
    min-height: 260px;
    padding: 92px 0 32px;
  }
  .copyright {
    font-size: clamp(.58rem, 2.7vw, .7rem);
    letter-spacing: 0;
  }
  .page-top { right: 16px; bottom: 16px; width: 40px; height: 40px; }
}