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

    :root {
      --cream:  #FCF9E8;
      --brown:  #3C321D;
      --green:  #007E43;
      --gray:   #6C6C6C;
      --light:  #F9F9F9;
      --white:  #FFFFFF;
    }

    body {
      background: var(--cream);
      color: var(--brown);
      font-family: 'Zen Maru Gothic', sans-serif;
      overflow-x: hidden;
    }

    /* ============================
       HEADER
    ============================ */
    .site-header {
      width: 100%;
      height: 150px;
      background: var(--cream);
      position: relative;
    }

    .site-header-inner {
      position: absolute;
      top: 60px; left: 4.17%; right: 4.17%;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .header-tagline {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 13px;
      color: var(--brown);
      line-height: 1.9;
      letter-spacing: 0.02em;
    }

    .header-right {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .header-nav-link {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 15px;
      color: var(--brown);
      text-decoration: none;
      letter-spacing: -0.01em;
    }

    /* ============================
       HERO
    ============================ */
    .hero {
      width: 100%;
      height: 648px;
      position: relative;
      overflow: hidden;
    }

    .hero-bg {
      position: absolute;
      bottom: 0; left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: bottom center;
      z-index: 0;
    }

    .bubble {
      position: absolute;
      pointer-events: none;
      z-index: 2;
    }

    .hero-content {
      position: absolute;
      top: 50px;
      left: 50%;
      transform: translateX(-50%);
      width: 465px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 32px;
      z-index: 2;
    }

    .hero-logo {
      width: 100%;
      display: block;
    }

    .hero-catch {
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 500;
      font-size: 15px;
      color: var(--brown);
      text-align: center;
      line-height: 2.2;
      letter-spacing: 0.15em;
      font-feature-settings: 'palt' 1;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--green);
      color: #fff;
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 500;
      font-size: 15px;
      letter-spacing: 0.07em;
      padding: 17px 60px;
      border-radius: 50px;
      text-decoration: none;
      border: none;
      cursor: pointer;
      font-feature-settings: 'palt' 1;
      white-space: nowrap;
    }
    .btn-primary::before {
      content: '+';
      font-size: 18px;
      font-weight: 400;
      line-height: 1;
      margin-right: 2px;
    }

    /* ============================
       BOARD SECTION
    ============================ */
    .board-section {
      width: 100%;
      background: var(--cream);
      position: relative;
      padding: 48px 0 80px;
      overflow-x: hidden;
    }

    .tree {
      position: absolute;
      pointer-events: none;
      z-index: 1;
    }

    .board-inner {
      width: calc(100% - 120px);
      max-width: 1003px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 28px;
      position: relative;
      z-index: 2;
    }

    .board-filter {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .filter-group {
      display: flex;
      gap: 10px;
    }

    .filter-btn {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 13px;
      padding: 7px 16px;
      border-radius: 40px;
      border: none;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
    }
    .filter-btn.active {
      background: var(--gray);
      color: #fff;
    }
    .filter-btn:not(.active) {
      background: var(--light);
      color: var(--brown);
    }

    .search-box {
      display: flex;
      align-items: center;
      width: 315px;
      height: 34px;
      background: var(--white);
      border: 2px solid var(--light);
      border-radius: 30px;
      padding: 0 10px 0 16px;
      gap: 8px;
    }
    .search-box input {
      flex: 1;
      border: none;
      outline: none;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 13px;
      color: #ACACAC;
      background: transparent;
    }
    .search-box input::placeholder { color: #ACACAC; }
    .search-box button {
      background: none;
      border: none;
      cursor: pointer;
      padding: 0;
      display: flex;
      align-items: center;
      color: var(--brown);
      font-size: 16px;
    }

    /* Card grid */
    .board-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 44px;
    }

    .board-card {
      background: var(--white);
      border-radius: 14px;
      padding: 42px 32px 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 217px;
      cursor: pointer;
      transition: box-shadow 0.2s;
      min-width: 0;
      overflow: hidden;
    }
    .board-card:hover {
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }

    .board-card-body {
      display: flex;
      flex-direction: column;
      gap: 8px;
      min-width: 0;
      overflow: hidden;
    }

    .card-title-row {
      display: flex;
      align-items: flex-end;
      gap: 8px;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      min-width: 0;
    }

    .card-title {
      font-size: 20px;
      color: var(--brown);
      letter-spacing: -0.08em;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      line-clamp: 2;
      overflow: hidden;
      word-break: break-all;
      overflow-wrap: break-word;
      min-width: 0;
    }

    .card-meta {
      display: flex;
      align-items: center;
      gap: 4px;
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 300;
      font-size: 11px;
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      color: var(--gray);
    }

    .card-join-btn {
      align-self: flex-end;
      border: 1.5px solid var(--green);
      background: transparent;
      color: var(--green);
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 12px;
      padding: 8px 14px;
      border-radius: 30px;
      cursor: pointer;
      white-space: nowrap;
      margin-top: 12px;
      transition: background 0.2s, color 0.2s;
    }
    .card-join-btn:hover {
      background: var(--green);
      color: #fff;
    }

    .board-empty {
      grid-column: 1 / -1;
      text-align: center;
      padding: 40px;
      font-family: 'Noto Sans JP', sans-serif;
      color: var(--gray);
      font-size: 14px;
    }

    /* Official cards section */
    .official-section {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .official-heading {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 13px;
      color: var(--green);
      letter-spacing: 0.06em;
    }

    .official-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 44px;
    }

    .board-card.official {
      background: #007E43;
      color: #fff;
    }
    .board-card.official .card-title {
      color: #fff;
    }
    .board-card.official .card-badge {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 13px;
      color: #fff;
      background: rgba(255,255,255,0.25);
      padding: 2px 8px;
      border-radius: 20px;
      letter-spacing: 0.06em;
      white-space: nowrap;
      flex-shrink: 0;
    }
    .board-card.official .card-meta {
      color: rgba(255,255,255,0.75);
    }
    .board-card.official .card-meta svg {
      stroke: rgba(255,255,255,0.75);
    }
    .board-card.official .card-desc {
      color: rgba(255,255,255,0.85);
    }
    .board-card.official .card-join-btn {
      border-color: #fff;
      color: #fff;
    }
    .board-card.official .card-join-btn:hover {
      background: rgba(255,255,255,0.2);
    }
    .board-card.official:hover {
      box-shadow: 0 4px 20px rgba(0,0,0,0.25);
    }

    .official-divider {
      border: none;
      border-top: 1.5px dashed #c8c0a8;
      margin: 8px 0;
    }

    @media (max-width: 900px) {
      .official-grid { grid-template-columns: 1fr; gap: 24px; }
    }
    @media (max-width: 480px) {
      .official-grid { gap: 20px; }
    }

    /* Board footer */
    .board-footer {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 24px;
      margin-top: 24px;
    }

    .btn-create {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--green);
      color: #fff;
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 500;
      font-size: 15px;
      letter-spacing: 0.07em;
      padding: 17px 50px;
      border-radius: 50px;
      text-decoration: none;
      border: none;
      cursor: pointer;
      font-feature-settings: 'palt' 1;
    }
    .btn-create::before {
      content: '+';
      font-size: 18px;
    }

    .board-more {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 5px;
      text-decoration: none;
    }
    .board-more-text {
      display: flex;
      align-items: center;
      gap: 4px;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 14px;
      color: var(--green);
      letter-spacing: -0.01em;
    }
    .board-more-text::after {
      content: '›';
      font-size: 18px;
    }
    .board-more-line {
      width: 100%;
      height: 1px;
      background: var(--green);
    }

    /* ============================
       ROOM CREATION MODAL
    ============================ */
    .room-modal {
      display: flex;
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
      position: fixed;
      z-index: 300;
      inset: 0;
      background: rgba(0,0,0,0.5);
      align-items: center;
      justify-content: center;
      transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    .room-modal.show {
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
    }
    .room-modal-content {
      background: var(--cream);
      border-radius: 20px;
      padding: 48px 40px 40px;
      width: 90%;
      max-width: 480px;
      position: relative;
      transform: scale(0.9);
      transition: transform 0.3s ease;
    }
    .room-modal.show .room-modal-content {
      transform: scale(1);
    }
    .room-modal-title {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 20px;
      color: var(--brown);
      margin-bottom: 24px;
      text-align: center;
    }

    /* 公式モーダル */
    .room-modal-content.official-modal {
      background: #007E43;
      overflow: hidden;
    }
    .room-modal-content.official-modal::before {
      content: '';
      position: absolute;
      top: -60px; right: -60px;
      width: 200px; height: 200px;
      border-radius: 50%;
      background: rgba(255,255,255,0.07);
      pointer-events: none;
    }
    .room-modal-content.official-modal::after {
      content: '';
      position: absolute;
      bottom: -40px; left: -40px;
      width: 160px; height: 160px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      pointer-events: none;
    }
    .official-modal .room-modal-close {
      color: rgba(255,255,255,0.8);
    }
    .official-modal .desc-modal-badge {
      display: inline-block;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 11px;
      color: #007E43;
      background: #fff;
      padding: 3px 10px;
      border-radius: 20px;
      letter-spacing: 0.06em;
      margin-bottom: 12px;
    }
    .official-modal .room-modal-title {
      color: #fff;
      text-align: left;
      margin-bottom: 6px;
    }
    .official-modal .desc-modal-meta {
      color: rgba(255,255,255,0.7);
    }
    .official-modal .desc-modal-divider {
      border: none;
      border-top: 1px solid rgba(255,255,255,0.2);
      margin: 16px 0;
    }
    .official-modal .desc-modal-text {
      color: rgba(255,255,255,0.92);
    }
    .official-modal .desc-modal-join {
      border-color: #fff;
      color: #fff;
    }
    .official-modal .desc-modal-join:hover {
      background: rgba(255,255,255,0.2);
    }
    /* 通常詳細モーダル（公式以外） */
    #descModalContent:not(.official-modal) .room-modal-title {
      text-align: left;
      margin-bottom: 6px;
    }
    .desc-modal-badge { display: none; }
    .desc-modal-divider {
      border: none;
      border-top: 1px solid rgba(60,50,29,0.12);
      margin: 16px 0;
    }
    .desc-modal-meta {
      font-family: 'Noto Sans JP', sans-serif;
      font-size: 12px;
      color: var(--gray);
    }
    .desc-modal-text {
      font-family: 'Noto Sans JP', sans-serif;
      font-size: 14px;
      line-height: 1.9;
      color: var(--brown);
      white-space: pre-wrap;
    }
    .desc-modal-join {
      border: 1.5px solid var(--green);
      background: transparent;
      color: var(--green);
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 14px;
      padding: 10px 24px;
      border-radius: 30px;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
    }
    .desc-modal-join:hover {
      background: var(--green);
      color: #fff;
    }
    .room-modal-input {
      width: 100%;
      padding: 14px 20px;
      border: 2px solid #e0dcd0;
      border-radius: 50px;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-size: 15px;
      color: var(--brown);
      background: var(--white);
      outline: none;
      transition: border-color 0.2s;
      margin-bottom: 16px;
    }
    .room-modal-input:focus {
      border-color: var(--green);
    }
    .room-modal-textarea {
      width: 100%;
      padding: 14px 20px;
      border: 2px solid #e0dcd0;
      border-radius: 16px;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-size: 14px;
      color: var(--brown);
      background: var(--white);
      outline: none;
      transition: border-color 0.2s;
      margin-bottom: 16px;
      resize: vertical;
      min-height: 90px;
      line-height: 1.7;
    }
    .room-modal-textarea:focus {
      border-color: var(--green);
    }
    .card-desc {
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 400;
      font-size: 12px;
      color: var(--gray);
      line-height: 1.7;
      margin-top: 6px;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
      line-clamp: 3;
      overflow: hidden;
      word-break: break-all;
      overflow-wrap: break-word;
    }
    .room-modal-error {
      color: #e05c5c;
      font-size: 13px;
      text-align: center;
      margin-bottom: 12px;
      min-height: 18px;
    }
    .room-modal-submit {
      width: 100%;
      padding: 16px;
      background: var(--green);
      color: #fff;
      border: none;
      border-radius: 50px;
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 500;
      font-size: 15px;
      cursor: pointer;
      letter-spacing: 0.07em;
    }
    .room-modal-close {
      position: absolute;
      top: 16px; right: 24px;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--brown);
      cursor: pointer;
      line-height: 1;
    }

    /* ============================
       FEATURE SECTION
    ============================ */
    .feature-section {
      width: 100%;
      background: #DFEED1;
      padding: 80px 0 100px;
      position: relative;
      z-index: 3;
    }

    .feature-inner {
      width: calc(100% - 120px);
      max-width: 1001px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 48px;
    }

    .section-heading {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .section-heading-en {
      font-family: 'Averia Sans Libre', sans-serif;
      font-weight: bold;
      font-size: 72.83px;
      color: var(--brown);
      letter-spacing: 0.02em;
      line-height: 1;
    }
    .section-heading-ja {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: bold;
      font-size: 18px;
      color: #007e43;
      letter-spacing: 0.08em;
    }

    .feature-grid {
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

    .feature-col {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .feature-card {
      background: var(--white);
      border-radius: 20px;
      padding: 36px 40px 32px;
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
      width: 100%;
    }

    .feature-card-desc {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 18px;
      color: var(--brown);
      line-height: 2;
      letter-spacing: 0.04em;
    }

    .feature-card-img {
      position: absolute;
      bottom: 20px; right: 20px;
      pointer-events: none;
    }

    .feature-btn-row {
      display: flex;
      justify-content: center;
    }

    /* ============================
       NEWS SECTION
    ============================ */
    .news-section {
      width: 100%;
      background: var(--white);
      padding: 90px 0 100px;
    }

    .news-inner {
      width: calc(100% - 120px);
      max-width: 1109px;
      margin: 0 auto;
      display: flex;
      gap: 13.89%;
      align-items: flex-start;
    }

    .news-heading {
      flex-shrink: 0;
    }

    .news-list {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 0;
    }

    .news-item {
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: 20px 0;
      border-bottom: 1px solid rgba(60,50,29,0.12);
    }
    .news-item:first-child {
      border-top: 1px solid rgba(60,50,29,0.12);
    }

    .news-date {
      font-family: 'Averia Sans Libre', sans-serif;
      font-weight: bold;
      font-size: 16.6px;
      color: #007e43;
      white-space: nowrap;
    }

    .news-title {
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 400;
      font-size: 16.6px;
      color: var(--brown);
      line-height: 1.7;
      font-feature-settings: 'palt' 1;
    }

    /* ============================
       FOOTER
    ============================ */
    footer.site-footer {
      width: 100%;
      min-height: 261px;
      background: #338751;
      position: relative;
      padding: 97px 9.375% 48px;
      box-sizing: border-box;
      margin: 0;
      text-align: left;
      font-size: inherit;
      letter-spacing: inherit;
      color: inherit;
    }

    .site-footer .footer-inner {
      width: 100%;
      display: block;
      padding-top: 0;
    }

    .footer-nav-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 39px;
    }

    .footer-nav-links-top {
      display: flex;
      gap: 20px;
    }

    .footer-link {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 500;
      font-size: 13px;
      color: var(--cream);
      text-decoration: none;
      letter-spacing: 0.03em;
      background: none;
      border: none;
      cursor: pointer;
      display: inline-block;
      padding: 0;
    }

    .footer-follow {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: 'Inter', sans-serif;
      font-weight: 400;
      font-size: 13px;
      color: var(--cream);
      text-decoration: none;
    }

    .footer-divider {
      height: 1px;
      background: rgba(252,249,232,0.3);
      margin-bottom: 24px;
    }

    .footer-nav-bottom {
      display: flex;
      gap: 20px;
    }

    .footer-back-top {
      position: absolute;
      right: 48px; bottom: 32px;
      width: 75px; height: 75px;
      border-radius: 50%;
      background: #FFFFFF;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .footer-back-top::after {
      content: '';
      display: block;
      width: 14px; height: 14px;
      border-top: 2px solid #338751;
      border-right: 2px solid #338751;
      transform: translateY(3px) rotate(-45deg);
    }

    /* ============================
       BUBBLE FLOAT ANIMATION
    ============================ */
    @keyframes bubbleFloat {
      0%   { opacity: 0;   transform: translateY(0px);  }
      15%  { opacity: 0.9; transform: translateY(0px);  }
      80%  { opacity: 0.9; transform: translateY(-40px);}
      100% { opacity: 0;   transform: translateY(-60px);}
    }

    .bubble-float {
      opacity: 0;
    }

    .bubble-float.is-floating {
      animation: bubbleFloat 3.2s ease-in-out forwards;
    }

    /* ============================
       HOW-TO MODAL
    ============================ */
    .modal {
      display: flex;
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
      position: fixed;
      z-index: 400;
      inset: 0;
      background: rgba(60,50,29,0.45);
      align-items: center;
      justify-content: center;
      transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    .modal.show {
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
    }
    .modal-content {
      background: var(--cream);
      margin: auto;
      padding: 52px 48px 44px;
      border-radius: 24px;
      width: 90%;
      max-width: 600px;
      max-height: 85vh;
      overflow-y: auto;
      position: relative;
      opacity: 0;
      transform: scale(0.94) translateY(8px);
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .modal.show .modal-content {
      opacity: 1;
      transform: scale(1) translateY(0);
    }
    h2#howToTitle {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 22px;
      color: var(--brown);
      text-align: center;
      margin-bottom: 28px;
      padding-bottom: 16px;
      border-bottom: 1.5px dashed #c8c0a8;
    }
    .howto-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0 24px;
    }
    .howto-col {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .howto-col + .howto-col {
      border-left: 1px solid rgba(60,50,29,0.08);
      padding-left: 24px;
    }
    .howto-item {
      padding: 14px 0 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .howto-label {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 13px;
      color: var(--green);
      letter-spacing: 0.06em;
      background: #DFEED1;
      padding: 4px 0;
      border-radius: 20px;
      margin-bottom: 8px;
      width: 100%;
    }
    .howto-label img {
      width: 16px; height: 16px;
    }
    .howto-svg-wrap {
      display: flex;
      justify-content: center;
    }
    .howto-svg-wrap svg {
      width: 100%;
      max-width: 150px;
      height: auto;
    }
    .howto-item-icon {
      width: 40px; height: 55px;
      flex-shrink: 0;
      border-radius: 12px;
      display: flex; align-items: center; justify-content: center;
    }
    .howto-item-icon img { width: 22px; height: 22px; }
    .howto-item-text {
      font-family: 'Noto Sans JP', sans-serif;
      font-weight: 400;
      font-size: 14px;
      color: var(--brown);
      line-height: 1.8;
      text-align: center;
    }
    .howtoimage {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      margin: 20px 0 8px;
      border-radius: 12px;
    }
    .howto-note {
      font-family: 'Noto Sans JP', sans-serif;
      font-size: 12px;
      color: var(--gray);
      text-align: center;
      margin-top: 16px;
      line-height: 1.7;
    }
    .howto-ver {
      font-family: 'Averia Sans Libre', sans-serif;
      font-size: 11px;
      color: #c8c0a8;
      text-align: right;
      margin-top: 12px;
    }
    .modal-close-btn {
      position: absolute;
      top: 20px; right: 24px;
      background: var(--white);
      border: none;
      width: 32px; height: 32px;
      border-radius: 50%;
      font-size: 18px;
      line-height: 1;
      cursor: pointer;
      color: var(--brown);
      display: flex; align-items: center; justify-content: center;
      transition: background 0.2s;
    }
    .modal-close-btn:hover { background: #eee; }
    @media (max-width: 480px) {
      .modal-content { padding: 40px 24px 32px; }
      h2#howToTitle { font-size: 18px; }
      .howto-grid { grid-template-columns: 1fr; gap: 16px 0; }
      .howto-col + .howto-col { border-left: none; padding-left: 0; border-top: 1px solid rgba(60,50,29,0.08); padding-top: 16px; }
    }

    /* ============================
       CONTACT POPUP
    ============================ */
    .contact-popup {
      position: fixed;
      inset: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      background: rgba(60,50,29,0.45);
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
      z-index: 400;
    }
    .contact-popup.show {
      opacity: 1;
      pointer-events: auto;
    }
    .popup-content {
      position: relative;
      background: var(--cream);
      padding: 48px 40px 40px;
      border-radius: 24px;
      max-width: 400px;
      width: 90%;
      text-align: center;
      transform: scale(0.94) translateY(8px);
      transition: transform 0.3s ease;
    }
    .contact-popup.show .popup-content {
      transform: scale(1) translateY(0);
    }
    .popup-close-btn {
      position: absolute;
      top: 20px; right: 24px;
      background: var(--white);
      border: none;
      width: 32px; height: 32px;
      border-radius: 50%;
      font-size: 18px;
      line-height: 1;
      cursor: pointer;
      color: var(--brown);
      display: flex; align-items: center; justify-content: center;
      transition: background 0.2s;
    }
    .popup-close-btn:hover { background: #eee; }
    .popup-heading {
      font-family: 'Zen Maru Gothic', sans-serif;
      font-weight: 700;
      font-size: 20px;
      color: var(--brown);
      margin-bottom: 8px;
    }
    .popup-sub {
      font-family: 'Noto Sans JP', sans-serif;
      font-size: 13px;
      color: var(--gray);
      margin-bottom: 24px;
      line-height: 1.7;
    }
    .email-box {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 14px 20px;
      background: var(--white);
      border: 1.5px solid #e0dcd0;
      border-radius: 50px;
      cursor: pointer;
      user-select: none;
      transition: border-color 0.2s, background 0.2s;
      margin-bottom: 12px;
    }
    .email-box:hover { border-color: var(--green); background: #f5fdf8; }
    .email-box.copied { border-color: var(--green); background: #f5fdf8; }
    .email-box span {
      font-family: 'Noto Sans JP', sans-serif;
      font-size: 14px;
      color: var(--brown);
      font-weight: 500;
    }
    .copy-icon { width: 16px; height: 16px; opacity: 0.5; flex-shrink: 0; }
    .mail-icon { display: none; }
    .copy-message {
      display: none;
      font-family: 'Noto Sans JP', sans-serif;
      font-size: 12px;
      color: var(--green);
      font-weight: 500;
      margin-top: 4px;
    }

    /* ============================
       VISUALLY HIDDEN
    ============================ */
    .visually-hidden {
      position: absolute;
      width: 1px; height: 1px;
      padding: 0; margin: -1px;
      overflow: hidden;
      clip: rect(0,0,0,0);
      white-space: nowrap;
      border: 0;
    }

    /* ============================================================
       RESPONSIVE — タブレット ( ≤ 900px )
    ============================================================ */
    @media (max-width: 900px) {
      .site-header { height: 100px; }
      .site-header-inner { top: 32px; left: 5%; right: 5%; }
      .header-tagline { font-size: 11px; }
      .header-nav-link { font-size: 13px; }

      .hero { height: 480px; }
      .hero-content { width: 80%; max-width: 380px; top: 36px; }
      .bubble { min-width: 24px; }

      .board-inner { width: calc(100% - 80px); }
      .board-filter { flex-direction: column; align-items: flex-start; gap: 16px; }
      .search-box { width: 100%; }
      .board-grid { grid-template-columns: 1fr; gap: 24px; }

      .feature-inner { width: calc(100% - 80px); }
      .section-heading-en { font-size: 52px; }
      .section-heading-ja { font-size: 14px; }
      .feature-grid { flex-direction: column; }
      .feature-col { width: 100%; }
      .feature-card { height: auto !important; min-height: 160px; }
      .feature-card-img {
        position: absolute !important;
        bottom: 16px !important; right: 16px !important;
        top: auto !important; left: auto !important;
        transform: none !important;
        max-width: 120px;
      }
      .bird1-img {
        max-width: 160px;
      }
      .bird2-img {
        max-width: 80px;
        top: 50% !important; bottom: auto !important;
        transform: translateY(-50%) rotate(-90deg) !important;
      }

      .news-section { padding: 60px 0 70px; }
      .news-inner { flex-direction: column; gap: 32px; width: calc(100% - 80px); }

      footer.site-footer { padding: 60px 5% 100px; }
      .footer-nav-top { flex-direction: column; align-items: flex-start; gap: 16px; }
      .footer-back-top { right: 24px; bottom: 24px; width: 56px; height: 56px; }

      .tree { display: none; }
    }

    /* ============================================================
       RESPONSIVE — スマートフォン ( ≤ 480px )
    ============================================================ */
    @media (max-width: 480px) {
      .site-header { height: 80px; }
      .site-header-inner { top: 24px; left: 5%; right: 5%; }
      .header-tagline { font-size: 10px; }
      .header-right { margin-left: auto; }

      .hero { height: 380px; }
      .hero-content { width: 88%; top: 28px; gap: 20px; }
      .hero-catch { font-size: 12px; letter-spacing: 0.08em; }
      .bubble { min-width: 20px; width: 6% !important; }
      .btn-primary { font-size: 13px; padding: 14px 36px; }

      .board-inner { width: calc(100% - 48px); }
      .board-grid { grid-template-columns: 1fr; gap: 20px; }
      .board-card { padding: 32px 24px 20px; }
      .card-title { font-size: 17px; }
      .btn-create { font-size: 13px; padding: 14px 36px; }

      .feature-section { padding: 56px 0 72px; }
      .feature-inner { width: calc(100% - 48px); gap: 32px; }
      .section-heading-en { font-size: 40px; }
      .section-heading-ja { font-size: 12px; }
      .feature-card {
        padding: 28px 28px 24px 32px !important;
        min-height: 150px;
        padding-top: 28px !important;
        justify-content: flex-start !important;
      }
      .feature-card-desc { font-size: 15px; }
      .feature-card-img {
        position: absolute !important;
        bottom: 12px !important; right: 12px !important;
        top: auto !important; left: auto !important;
        transform: none !important;
        max-width: 100px;
      }
      .bird1-img {
        max-width: 130px;
      }
      .bird2-img {
        max-width: 65px;
        top: 50% !important; bottom: auto !important;
        transform: translateY(-50%) rotate(-90deg) !important;
      }

      .news-section { padding: 48px 0 56px; }
      .news-inner { width: calc(100% - 48px); gap: 24px; }
      .news-date { font-size: 13px; }
      .news-title { font-size: 13px; }

      footer.site-footer { padding: 48px 5% 80px; }
      .footer-link { font-size: 12px; }
      .footer-nav-bottom { gap: 12px; }
      .footer-back-top { right: 16px; bottom: 16px; width: 48px; height: 48px; }
      .footer-back-top::after { width: 10px; height: 10px; }

      .feature-section > div:first-child,
      footer.site-footer > div:first-child { height: 40px; top: -38px; }
    }