:root {
    --forest-dark:   #1a4a2e;
    --forest-mid:    #2d6a4f;
    --forest-light:  #52b788;
    --leaf:          #74c69d;
    --moss:          #40916c;
    --bark:          #6b4c35;
    --earth:         #c8a96e;
    --sky-pink:      #f4c2c2;
    --sky-blue:      #bde0fe;
    --cream:         #faf8f3;
    --warm-white:    #fffef9;
    --text-dark:     #1c2b1e;
    --text-mid:      #3d5442;
    --yellow-tag:    #f6e04b;
    --pink-tag:      #f9b8c4;
    --green-tag:     #a8d5b5;
  }

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

  html { font-size: 16px; scroll-behavior: smooth; }

  body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--cream);
    color: var(--text-dark);
    overflow-x: hidden;
    line-height: 1.7;
  }

  /* ── BASE HEADINGS ── */
  h3 {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--forest-dark);
    line-height: 1.4;
    margin: 2rem 0 0.8rem;
    padding-left: 0.75rem;
    border-left: 4px solid var(--forest-light);
  }

  h4 {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--forest-mid);
    line-height: 1.5;
    margin: 1.4rem 0 0.5rem;
    padding-left: 0.6rem;
    border-left: 2px solid var(--leaf);
  }

  /* ── WATERCOLOR TEXTURE ── */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
      radial-gradient(ellipse 80% 60% at 20% 10%, rgba(180,220,160,.18) 0%, transparent 70%),
      radial-gradient(ellipse 60% 70% at 80% 30%, rgba(200,230,180,.15) 0%, transparent 60%),
      radial-gradient(ellipse 50% 40% at 50% 80%, rgba(210,230,160,.12) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
  }

  /* ── HERO SLIDER ── */
  .hero-slider {
    width: 100%;
    overflow: hidden;
  }

  .hero-slider .slick-slide {
    height: 480px;
  }

  .hero-slider .slick-slide div,
  .hero-slider .slick-slide img,
  .hero-slider .slick-slide video {
    width: 100%;
    height: 480px;
    object-fit: cover;
    display: block;
  }

  .hero-slider .slick-prev,
  .hero-slider .slick-next {
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 40px;
    height: 40px;
  }

  .hero-slider .slick-prev { left: 16px; }
  .hero-slider .slick-next { right: 16px; }

  .hero-slider .slick-prev::before,
  .hero-slider .slick-next::before {
    font-size: 32px;
    color: #fff;
    opacity: 0.85;
  }

  .hero-slider .slick-dots {
    bottom: 12px;
  }

  .hero-slider .slick-dots li button::before {
    color: #fff;
    font-size: 8px;
    opacity: 0.6;
  }

  .hero-slider .slick-dots li.slick-active button::before {
    opacity: 1;
  }

  header {
    position: relative;
    background: var(--warm-white);
    padding: 0;
    z-index: 100;
  }

  .header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2rem;
    position: relative;
    z-index: 2;
  }

  .logo-badge img {
    width: 160px;
    height: auto;
    display: block;
  }

  .header-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
    background: rgba(255, 254, 249, 0.8);
  }

  .header-nav a {
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: .12em;
    color: var(--forest-dark);
    text-decoration: none;
    transition: color .2s ease;
  }

  .header-nav a:hover,
  .header-nav a.current {
    color: var(--forest-mid);
    border-bottom: 2px solid var(--forest-mid);
    padding-bottom: 2px;
  }

  /* ── HERO ── */
  .hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem 5rem;
    overflow: hidden;
  }

  .hero-logo {
    width: min(400px, 70vw);
    height: auto;
    display: block;
    position: relative;
    z-index: 1;
    animation: fadeUp .8s ease both;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  p.section-title{
    width:100%;
    height:auto;
    display:block;
    margin: 2.5rem auto;
    text-align:center;
    font-size: 3.35rem;
    color: var(--forest-mid);
  }

   p.section-title small{
    display:block;
    font-size: 1rem;
    text-align: center;
   }

  .mission-text {
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1rem;
    line-height: 1.9;
    color: var(--text-dark);
    text-align: justify;
  }

  /* ── CARDS GRID ── */
  .cards-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
    margin-bottom: 6rem;
  }

  .cards-grid .card {
    flex: 0 0 calc((100% - 2.4rem) / 3);
    text-decoration: none;
    color: inherit;
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    border: 1px solid rgba(45,106,79,.12);
    box-shadow: 0 4px 20px rgba(26,74,46,.06);
    overflow: hidden;
    transition: transform .3s ease, box-shadow .3s ease;
    display: flex;
    flex-direction: column;
  }

  .cards-grid .card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(26,74,46,.12);
  }

  .cards-grid .card figure {
    margin: 0;
    aspect-ratio: 16 / 9;
    overflow: hidden;
  }

  .cards-grid .card figure img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .4s ease;
  }

  .cards-grid .card:hover figure img {
    transform: scale(1.04);
  }

  .cards-grid .index-time {
    font-size: 1rem;
    color: var(--moss);
    font-weight: 600;
    letter-spacing: .08em;
    padding: .8rem 1rem .2rem;
  }

  .cards-grid .index-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--forest-dark);
    line-height: 1.6;
    padding: 0 1rem 1rem;
  }




  /* ── MAIN CONTENT ── */
  main {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
  }

  /* ── SECTION HEADERS ── */
  .section-badge {
    display: inline-flex;
    align-items: center;
    gap: .8rem;
    margin-bottom: 1.5rem;
  }

  .part-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--yellow-tag);
    color: var(--forest-dark);
    border-radius: 8px;
    padding: .4rem 1.2rem;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 900;
    font-size: 1.25rem;
    white-space: nowrap;
  }

  .part-label.pink { background: var(--pink-tag); }
  .part-label.green { background: var(--green-tag); }

  .part-time {
    font-size: 0.9rem;
    color: var(--text-mid);
    background: rgba(255,255,255,.8);
    padding: .2rem .6rem;
    border-radius: 10px;
    border: 1px solid rgba(45,106,79,.2);
  }

  /* ── PART 1 ── */
  .part {
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2.5rem;
    border: 1px solid rgba(45,106,79,.12);
    box-shadow: 0 4px 30px rgba(26,74,46,.06);
    transition: transform .3s ease, box-shadow .3s ease;
  }

  .part:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 40px rgba(26,74,46,.1);
  }

  .part-title-main {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 900;
    font-size: 1.7rem;
    color: var(--forest-dark);
    margin-bottom: 1.5rem;
    line-height: 1.3;
  }

  .part-title-main .quote-mark {
    color: var(--forest-mid);
  }

  /* ── SPEAKERS ── */
  .speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .speaker-card {
    background: var(--cream);
    border-radius: 8px;
    padding: 1.2rem;
    border-left: 4px solid var(--forest-light);
  }

  .speaker-role {
    font-size: 1rem;
    color: var(--moss);
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    margin-bottom: .3rem;
  }

  .speaker-name {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 900;
    font-size: 1.7rem;
    color: var(--forest-dark);
    margin-bottom: .2rem;
  }

  .speaker-affil {
    font-size: 1rem;
    color: var(--text-mid);
    margin-bottom: .8rem;
    padding-bottom: .8rem;
    border-bottom: 1px dashed rgba(45,106,79,.2);
  }

  .speaker-bio {
    font-size: 1rem;
    color: var(--text-mid);
    line-height: 1.7;
  }

  /* ── COORDINATOR ── */
  .coordinator-card {
    background: rgba(116,198,157,.1);
    border-radius: 8px;
    padding: 1.2rem 1.5rem;
    border: 1px solid rgba(116,198,157,.3);
    margin-top: 1rem;
  }

  .coordinator-card .speaker-card {
    background: transparent;
    border-left-color: var(--leaf);
    padding: 0;
    border-radius: 0;
  }

  /* ── APPLY BOX ── */
  .apply-box {
    background: var(--forest-dark);
    color: #fff;
    border-radius: 12px;
    padding: .8rem 1.2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1.2rem;
    flex-wrap: wrap;
  }

  .apply-box .label {
    font-size: 0.85rem;
    background: rgba(255,255,255,.2);
    padding: .2rem .6rem;
    border-radius: 6px;
    flex-shrink: 0;
  }

  .apply-box .deadline {
    font-size: 0.95rem;
    opacity: .9;
  }

  .apply-box .deadline strong {
    color: var(--yellow-tag);
  }

  /* ── PART 2 ── */
  .workshop-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 900;
    font-size: 1.7rem;
    color: var(--forest-dark);
    letter-spacing: .05em;
    margin-bottom: .5rem;
  }

  .workshop-sub {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.25rem;
    color: var(--forest-mid);
    margin-bottom: 1.2rem;
    line-height: 1.5;
    letter-spacing: .08em;
  }

  .workshop-desc {
    font-size: 1rem;
    color: var(--text-mid);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    padding: 1rem 1.2rem;
    background: rgba(116,198,157,.08);
    border-radius: 10px;
    border-left: 3px solid var(--leaf);
  }

  .courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.2rem;
    margin-bottom: 1.2rem;
  }

  .course-card {
    border-radius: 8px;
    padding: 1.2rem;
    position: relative;
    overflow: hidden;
  }

  .course-card.mountain {
    background: linear-gradient(135deg, rgba(82,183,136,.15) 0%, rgba(82,183,136,.05) 100%);
    border: 1px solid rgba(82,183,136,.25);
  }

  .course-card.valley {
    background: linear-gradient(135deg, rgba(200,169,110,.15) 0%, rgba(200,169,110,.05) 100%);
    border: 1px solid rgba(200,169,110,.25);
  }

  .course-name {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--forest-dark);
    margin-bottom: .6rem;
  }

  .course-guides {
    font-size: 1rem;
    color: var(--text-mid);
    line-height: 1.6;
  }

  .course-guides strong {
    color: var(--moss);
    font-weight: 700;
  }

  .capacity-note {
    font-size: 1rem;
    color: var(--text-mid);
    background: rgba(255,255,255,.6);
    padding: .6rem 1rem;
    border-radius: 8px;
    margin-top: .5rem;
  }

  /* ── GEAR INFO ── */
  .gear-box {
    background: rgba(255,255,255,.8);
    border-radius: 8px;
    padding: 1.2rem;
    border: 1px solid rgba(45,106,79,.15);
    margin-top: 1rem;
  }

  .gear-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--forest-dark);
    margin-bottom: .5rem;
  }

  .gear-list {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
    list-style: none;
  }

  .gear-list li {
    font-size: 0.9rem;
    background: var(--green-tag);
    color: var(--forest-dark);
    padding: .2rem .7rem;
    border-radius: 8px;
    font-weight: 500;
  }

  /* ── ABOUT SECTION ── */
  .about-section {
    background: var(--forest-dark);
    color: #fff;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
  }

  .about-section::before {
    content: '';
    position: absolute;
    top: -50%; right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(82,183,136,.2) 0%, transparent 70%);
    pointer-events: none;
  }

  .about-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: .6rem;
    border-bottom: 1px solid rgba(255,255,255,.2);
    position: relative;
    z-index: 1;
  }

  .about-text {
    font-size: 0.95rem;
    line-height: 1.9;
    opacity: .9;
    position: relative;
    z-index: 1;
  }

  /* ── CONTACT ── */
  .contact-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
    padding-top: 1.2rem;
    border-top: 1px solid rgba(255,255,255,.15);
    position: relative;
    z-index: 1;
  }

  .contact-label {
    font-size: 0.85rem;
    background: rgba(255,255,255,.2);
    padding: .2rem .8rem;
    border-radius: 8px;
    white-space: nowrap;
  }

  .contact-email {
    font-size: 1rem;
    color: var(--leaf);
    font-weight: 500;
    text-decoration: none;
    word-break: break-all;
  }

  .contact-email:hover { text-decoration: underline; }

  /* ── ORGANIZER FOOTER ── */
  footer {
    background: var(--cream);
    border-top: 2px solid rgba(45,106,79,.15);
    padding: 1.5rem 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-mid);
    line-height: 2;
    position: relative;
    z-index: 1;
  }

  footer .footer-row {
    margin-bottom: .3rem;
  }

  footer .footer-row strong {
    color: var(--forest-dark);
  }

  /* ── FLOATING DECORATION ── */
  .deco-animal {
    position: absolute;
    font-size: 2.25rem;
    opacity: .25;
    pointer-events: none;
    z-index: 0;
  }


  /* ── MEMBER PAGE ── */
  .member-section {
    margin-bottom: 3rem;
  }

  .member-section-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--forest-mid);
    letter-spacing: .15em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    padding-bottom: .6rem;
    border-bottom: 1px solid rgba(45,106,79,.2);
  }

  /* 教員カード */
  .faculty-card {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    border: 1px solid rgba(45,106,79,.12);
    box-shadow: 0 4px 30px rgba(26,74,46,.06);
    padding: 2rem;
  }

  .faculty-photo {
    flex-shrink: 0;
    width: 160px;
  }

  .faculty-photo img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 8px;
    display: block;
  }

  .faculty-info {
    display: flex;
    flex-direction: column;
    gap: .3rem;
    padding-top: .4rem;
  }

  .faculty-role {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: .1em;
    color: var(--moss);
    background: rgba(116,198,157,.15);
    display: inline-block;
    padding: .2rem .8rem;
    border-radius: 8px;
    align-self: flex-start;
    margin-bottom: .4rem;
  }

  .faculty-name-ja {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 900;
    font-size: 1.4rem;
    color: var(--forest-dark);
    line-height: 1.2;
  }

  .faculty-name-en {
    font-size: 0.9rem;
    letter-spacing: .12em;
    color: var(--text-mid);
    margin-bottom: .6rem;
  }

  .faculty-affil {
    font-size: 0.95rem;
    color: var(--text-mid);
    line-height: 1.8;
    padding-top: .6rem;
    border-top: 1px dashed rgba(45,106,79,.2);
  }

  /* 学生カード グリッド */
  .student-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
  }

  .student-card {
    flex: 0 0 calc((100% - 2.4rem) / 3);
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    border: 1px solid rgba(45,106,79,.12);
    box-shadow: 0 4px 20px rgba(26,74,46,.06);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform .3s ease, box-shadow .3s ease;
  }

  .student-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(26,74,46,.12);
  }

  .student-dept {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--moss);
    letter-spacing: .08em;
    padding: .8rem 1rem .2rem;
  }

  .student-name {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--forest-dark);
    padding: 0 1rem .4rem;
  }

  .student-theme {
    font-size: 0.9rem;
    color: var(--text-mid);
    line-height: 1.7;
    padding: 0 1rem 1rem;
    border-top: 1px dashed rgba(45,106,79,.15);
    margin-top: auto;
    padding-top: .6rem;
  }


  /* ── REPORT PAGE ── */
  .report-year {
    margin-bottom: 3rem;
  }

  .report-year-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--forest-dark);
    margin-bottom: 1rem;
    padding-bottom: .6rem;
    border-bottom: 2px solid var(--forest-light);
  }

  .report-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
  }

  .report-group {
    display: flex;
    flex-direction: column;
    gap: .4rem;
  }

  .report-group-title {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: .1em;
    color: var(--moss);
    background: rgba(116,198,157,.15);
    display: inline-block;
    padding: .2rem .8rem;
    border-radius: 8px;
    margin-bottom: .2rem;
    align-self: flex-start;
  }

  .report-item {
    display: flex;
    align-items: baseline;
    gap: .8rem;
    padding: .7rem 1rem;
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 10px;
    border: 1px solid rgba(45,106,79,.1);
    transition: background .2s ease;
  }

  .report-item:hover {
    background: rgba(255,255,255,.95);
  }

  .report-item::before {
    content: '・';
    color: var(--forest-light);
    flex-shrink: 0;
    font-size: 1.15rem;
  }

  .report-student {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--forest-dark);
    white-space: nowrap;
    flex-shrink: 0;
  }

  .report-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1rem;
    color: var(--text-mid);
    line-height: 1.7;
  }

  /* ── CONTACT PAGE ── */
  .contact-section {
    margin-bottom: 3rem;
  }

  .contact-section-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--forest-mid);
    letter-spacing: .15em;
    margin-bottom: 1.5rem;
    padding-bottom: .6rem;
    border-bottom: 1px solid rgba(45,106,79,.2);
  }

  .access-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
  }

  .access-map {
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    border: 1px solid rgba(45,106,79,.12);
    box-shadow: 0 4px 20px rgba(26,74,46,.08);
    background: var(--cream);
  }

  .access-map iframe {
    width: 100%;
    height: 100%;
    display: block;
  }

  .access-info {
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    border: 1px solid rgba(45,106,79,.12);
    padding: 1.6rem;
  }

  .access-dl {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
  }

  .access-row {
    display: grid;
    grid-template-columns: 4em 1fr;
    gap: .6rem;
    align-items: baseline;
  }

  .access-row dt {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--moss);
    background: rgba(116,198,157,.15);
    padding: .2rem .5rem;
    border-radius: 6px;
    text-align: center;
    white-space: nowrap;
  }

  .access-row dd {
    font-size: 0.95rem;
    color: var(--text-dark);
    line-height: 1.8;
  }

  .contact-mail-box {
    background: rgba(255,255,255,.75);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    border: 1px solid rgba(45,106,79,.12);
    padding: 1.8rem 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
  }

  .contact-mail-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-mid);
    letter-spacing: .05em;
    white-space: nowrap;
  }

  .contact-mail-link {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--forest-mid);
    text-decoration: none;
    letter-spacing: .05em;
    border-bottom: 1px solid transparent;
    transition: border-color .2s ease;
  }

  .contact-mail-link:hover {
    border-bottom-color: var(--forest-mid);
  }


  /* ── HAMBURGER BUTTON ── */
  .nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    position: relative;
    z-index: 200;
  }

  .nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--forest-dark);
    border-radius: 2px;
    transition: transform .3s ease, opacity .3s ease;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* ── RESPONSIVE (max 767px) ── */
  @media (max-width: 767px) {

    /* ハンバーガーボタン表示・常に最前面 */
    .nav-toggle { display: flex; }
    .header-top { z-index: 200; }

    /* ナビ：フルスクリーンオーバーレイ */
    .header-nav {
      position: fixed;
      inset: 0;
      background: rgba(250, 248, 243, 0.8);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      display: none;
      z-index: 150;
    }

    .header-nav.open { display: flex; }

    .header-nav a {
      font-size: 1.35rem;
      letter-spacing: .15em;
    }

    .header-nav a:hover,
    .header-nav a.current {
      padding-bottom: 3px;
    }

    /* ヘッダー・ヒーロー */
    .header-top { padding: 1rem 1.2rem; }
    .logo-badge img { width: 120px; }
    .hero { padding: 3rem 1.2rem 4rem; }
    main { padding: 2rem 1rem 4rem; }

    /* カード類：1カラム */
    .cards-grid .card { flex: 0 0 100%; }
    .student-card { flex: 0 0 100%; }

    /* 教員カード：縦並び */
    .faculty-card { flex-direction: column; gap: 1.2rem; }
    .faculty-photo { width: 120px; }

    /* フォーラム内コンテンツ */
    .speakers-grid { grid-template-columns: 1fr; }
    .courses-grid  { grid-template-columns: 1fr; }
    .part { padding: 1.4rem; }

    /* コンタクト */
    .access-layout { grid-template-columns: 1fr; }
    .contact-mail-box { flex-direction: column; align-items: flex-start; gap: .6rem; }
  }

  /* ── SCROLL REVEAL ── */
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .7s ease, transform .7s ease;
  }

  .reveal.visible {
    opacity: 1;
    transform: none;
  }