:root {
      --ink: #18212f;
      --muted: #607080;
      --line: #d8e1e5;
      --paper: #ffffff;
      --mist: #edf5f3;
      --court: #1f8a70;
      --court-dark: #156355;
      --coral: #e65f4f;
      --gold: #f3b23b;
      --navy: #24395c;
      --shadow: 0 18px 45px rgba(24, 33, 47, 0.14);
    }

    * {
      box-sizing: border-box;
    }

    [hidden] {
      display: none !important;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: #f6faf9;
      font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
      line-height: 1.7;
    }

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

    button,
    input,
    textarea,
    select {
      font: inherit;
    }

    .site-header {
      position: fixed;
      inset: 0 0 auto;
      z-index: 20;
      background: rgba(255, 255, 255, 0.9);
      border-bottom: 1px solid rgba(216, 225, 229, 0.8);
      backdrop-filter: blur(14px);
    }

    .nav {
      width: min(1120px, calc(100% - 32px));
      height: 68px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      letter-spacing: 0;
      min-width: 0;
    }

    .brand-mark {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      color: #fff;
      background: var(--court);
      border-radius: 50%;
      box-shadow: 0 8px 18px rgba(31, 138, 112, 0.28);
    }

    .brand span:last-child {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 18px;
      color: var(--muted);
      font-size: 0.94rem;
      font-weight: 700;
    }

    .nav-links a:hover {
      color: var(--court-dark);
    }

    .hero {
      min-height: 56vh;
      display: grid;
      align-items: end;
      padding: 92px 0 42px;
      background:
        linear-gradient(90deg, rgba(10, 20, 28, 0.72), rgba(10, 20, 28, 0.34) 48%, rgba(10, 20, 28, 0.1)),
        url("../assets/badminton-hero.png") center / cover no-repeat;
      color: #fff;
    }

    .hero-inner,
    .section-inner {
      width: min(1120px, calc(100% - 32px));
      margin: 0 auto;
    }

    .hero-copy {
      max-width: 690px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin: 0 0 14px;
      color: #eafff8;
      font-weight: 800;
    }

    .eyebrow::before {
      content: "";
      width: 34px;
      height: 3px;
      background: var(--gold);
      border-radius: 99px;
    }

    h1 {
      margin: 0;
      font-size: clamp(2.2rem, 4.2vw, 4rem);
      line-height: 1.06;
      letter-spacing: 0;
    }

    .hero-copy p {
      max-width: 620px;
      margin: 22px 0 0;
      color: #f1f8f6;
      font-size: 1.08rem;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 30px;
    }

    .button {
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0 18px;
      border: 0;
      border-radius: 8px;
      cursor: pointer;
      font-weight: 800;
      transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
    }

    .button:hover {
      transform: translateY(-1px);
    }

    .button-primary {
      color: #fff;
      background: var(--coral);
      box-shadow: 0 12px 26px rgba(230, 95, 79, 0.34);
    }

    .button-secondary {
      color: var(--ink);
      background: #fff;
    }

    section {
      padding: 72px 0;
    }

    .section-title {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(240px, 430px);
      gap: 24px;
      align-items: end;
      margin-bottom: 24px;
    }

    h2 {
      margin: 0;
      font-size: clamp(1.85rem, 3vw, 2.7rem);
      line-height: 1.18;
      letter-spacing: 0;
    }

    .section-subtitle,
    .form-title {
      margin: 10px 0 0;
      font-size: 1.08rem;
      line-height: 1.35;
    }

    .lead {
      margin: 0;
      color: var(--muted);
    }

    #TOP-BOARD-LEAD-SPACE {
      grid-row: span 2;
    }

    .practice {
      background: var(--paper);
    }

    .practice-grid,
    .circle-list {
      display: grid;
      gap: 18px;
    }

    .practice-card,
    .circle-card,
    .board-panel,
    .contact-box {
      border: 1px solid var(--line);
      border-radius: 8px;
      background: var(--paper);
      box-shadow: 0 12px 28px rgba(24, 33, 47, 0.08);
    }

    .circle-row {
      display: grid;
      grid-template-columns: minmax(290px, 420px) minmax(0, 1fr);
      gap: 18px;
      align-items: stretch;
    }

    .circle-card {
      position: relative;
      display: grid;
      gap: 14px;
      padding: 24px;
      overflow: hidden;
    }

    .circle-card::before {
      content: "";
      position: absolute;
      inset: 0 0 auto;
      height: 6px;
      background: var(--accent);
    }

    .circle-card h3 {
      margin: 14px 0 0;
      font-size: 1.45rem;
      line-height: 1.3;
    }

    .circle-card p {
      margin: 0;
      color: var(--muted);
      white-space: pre-wrap;
    }

    .circle-contact-button {
      justify-self: start;
    }

    .circle-card small,
    .schedule-card small {
      color: #71808e;
      font-size: 0.84rem;
      font-weight: 800;
    }

    .circle-meta {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
      margin: 0;
    }

    .circle-meta div {
      padding: 12px;
      border-radius: 8px;
      background: var(--mist);
    }

    .circle-meta dt {
      margin: 0 0 4px;
      color: var(--muted);
      font-size: 0.82rem;
      font-weight: 800;
    }

    .circle-meta dd {
      margin: 0;
      font-weight: 900;
    }

    .circle-schedule {
      min-width: 0;
      display: grid;
      align-content: stretch;
    }

    .schedule-scroll {
      display: grid;
      grid-auto-flow: column;
      grid-auto-columns: minmax(260px, 340px);
      gap: 12px;
      overflow-x: auto;
      padding-bottom: 8px;
      scroll-snap-type: x proximity;
    }

    .schedule-card {
      display: grid;
      gap: 10px;
      min-height: 100%;
      padding: 18px;
      border: 1px solid var(--line);
      border-left: 6px solid var(--gold);
      border-radius: 8px;
      background: #fffdf7;
      scroll-snap-align: start;
    }

    .schedule-card h4 {
      margin: 0;
      font-size: 1.08rem;
      line-height: 1.35;
    }

    .schedule-card p {
      margin: 0;
      color: var(--ink);
      white-space: pre-wrap;
    }

    .new-badge {
      width: fit-content;
      height: 26px;
      display: inline-flex;
      align-self: start;
      align-items: center;
      justify-content: center;
      padding: 0 9px;
      border-radius: 999px;
      background: #fff0ed;
      color: #a63b2f;
      font-size: 0.78rem;
      font-weight: 900;
      line-height: 1;
      white-space: nowrap;
    }

    .practice-card {
      min-height: 285px;
      display: flex;
      flex-direction: column;
      padding: 24px;
      position: relative;
      overflow: hidden;
    }

    .practice-card::before {
      content: "";
      position: absolute;
      inset: 0 0 auto;
      height: 6px;
      background: var(--accent);
    }

    .day {
      width: 52px;
      height: 52px;
      display: grid;
      place-items: center;
      margin-bottom: 18px;
      color: #fff;
      background: var(--navy);
      border-radius: 50%;
      font-weight: 900;
    }

    .practice-card h3 {
      margin: 0 0 8px;
      font-size: 1.42rem;
      line-height: 1.25;
    }

    .practice-card p {
      margin: 0;
      color: var(--muted);
      white-space: pre-wrap;
    }

    .practice-date-block {
      display: none;
    }

    .compact-title {
      margin-bottom: 18px;
    }

    .compact-title h2 {
      font-size: clamp(1.35rem, 2.2vw, 1.9rem);
    }

    .practice-date-list {
      display: grid;
      gap: 12px;
    }

    .practice-date-card {
      display: grid;
      gap: 8px;
      padding: 18px;
      border-left: 6px solid var(--gold);
      border-radius: 8px;
      background: var(--mist);
    }

    .practice-date-card p {
      margin: 0;
      color: var(--ink);
      font-weight: 700;
      white-space: pre-wrap;
    }

    .practice-date-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 12px;
      color: var(--muted);
      font-size: 0.9rem;
      font-weight: 800;
    }

    .meta-list {
      display: grid;
      gap: 10px;
      margin: auto 0 0;
      padding: 20px 0 0;
      list-style: none;
    }

    .meta-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: var(--ink);
      font-weight: 700;
    }

    .meta-list span {
      width: 24px;
      flex: 0 0 24px;
      text-align: center;
    }

    .announcements {
      background: linear-gradient(135deg, #f7fdf9 0%, #eef7f2 100%);
      border-top: 1px solid rgba(31, 138, 112, 0.12);
      border-bottom: 1px solid rgba(31, 138, 112, 0.12);
    }

    .announcement-toolbar {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 16px;
    }

    .announcement-toggle {
      width: fit-content;
    }

    .announcement-form-panel {
      display: grid;
    }

    .board {
      background: var(--mist);
    }

    .board-layout {
      display: grid;
      grid-template-columns: minmax(300px, 390px) minmax(0, 1fr);
      gap: 20px;
      align-items: start;
    }

    .board-panel {
      padding: 22px;
      border: 1px solid rgba(31, 138, 112, 0.14);
      box-shadow: 0 10px 24px rgba(24, 33, 47, 0.06);
    }

    .form-grid {
      display: grid;
      gap: 14px;
    }

    label {
      display: grid;
      gap: 6px;
      color: var(--ink);
      font-size: 0.92rem;
      font-weight: 800;
    }

    .field-label {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 7px;
    }

    .field-requirement {
      display: inline-flex;
      align-items: center;
      min-height: 20px;
      padding: 0 7px;
      border-radius: 999px;
      font-size: 0.72rem;
      font-weight: 900;
      line-height: 1;
    }

    .field-requirement.is-required {
      color: #a63b2f;
      background: #fff0ed;
      border: 1px solid #f0b4ac;
    }

    .field-requirement.is-optional {
      color: #536574;
      background: #eef3f5;
      border: 1px solid #d3dde1;
    }

    input,
    textarea,
    select {
      width: 100%;
      border: 1px solid #cbd8dc;
      border-radius: 8px;
      background: #fff;
      color: var(--ink);
      padding: 11px 12px;
      outline: none;
    }

    input[type="checkbox"] {
      width: auto;
      accent-color: var(--court);
    }

    textarea {
      min-height: 110px;
      resize: vertical;
    }

    input:focus,
    textarea:focus,
    select:focus {
      border-color: var(--court);
      box-shadow: 0 0 0 3px rgba(31, 138, 112, 0.15);
    }

    .board-actions {
      display: flex;
      gap: 10px;
    }

    .board-status {
      min-height: 1.5em;
      margin: 0;
      color: var(--court-dark);
      font-size: 0.9rem;
      font-weight: 700;
    }

    .board-hint {
      margin: -4px 0 0;
      color: var(--muted);
      font-size: 0.82rem;
      line-height: 1.5;
    }

    .board-status.is-error {
      color: #a63b2f;
    }

    .button:disabled {
      cursor: wait;
      opacity: 0.68;
      transform: none;
    }

    .icon-button {
      width: 46px;
      height: 46px;
      display: grid;
      place-items: center;
      border: 1px solid var(--line);
      border-radius: 8px;
      background: #fff;
      color: var(--muted);
      cursor: pointer;
    }

    .post-list {
      display: grid;
      gap: 12px;
      max-height: 760px;
      overflow-y: auto;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .post-list-panel {
      min-height: 0;
    }

    .load-more-posts {
      margin-top: 14px;
      width: 100%;
    }

    .post {
      display: grid;
      gap: 8px;
      padding: 18px;
      border: 1px solid rgba(216, 225, 229, 0.9);
      border-left: 6px solid var(--court);
      border-radius: 10px;
      background: #fff;
      box-shadow: 0 8px 18px rgba(24, 33, 47, 0.04);
    }

    .post-header {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 12px;
      align-items: center;
      justify-content: space-between;
    }

    .post-title {
      margin: 0;
      font-size: 1.05rem;
      line-height: 1.35;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      min-height: 28px;
      padding: 0 10px;
      border-radius: 999px;
      background: #fff0ed;
      color: #a63b2f;
      font-size: 0.84rem;
      font-weight: 900;
    }

    .post p {
      margin: 0;
      color: var(--muted);
      white-space: pre-wrap;
    }

    .post-time {
      color: #71808e;
      font-size: 0.86rem;
    }

    .post-delete {
      min-height: 34px;
      padding: 0 12px;
      border: 1px solid #f0b4ac;
      border-radius: 6px;
      background: #fff6f4;
      color: #a63b2f;
      font: inherit;
      font-size: 0.86rem;
      font-weight: 800;
      cursor: pointer;
    }

    .post-delete:hover {
      background: #ffe9e5;
    }

    .post-delete:disabled {
      cursor: wait;
      opacity: 0.6;
    }

    .backup-board {
      margin: 18px 0 0;
      color: var(--muted);
      font-weight: 700;
    }

    .backup-board a {
      color: var(--court-dark);
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .contact {
      background: #fff;
    }

    .contact-box {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 24px;
      align-items: center;
      padding: 28px;
      background:
        linear-gradient(120deg, rgba(31, 138, 112, 0.08), rgba(243, 178, 59, 0.12)),
        #fff;
    }

    .contact-box h2 {
      font-size: clamp(1.5rem, 2.6vw, 2.25rem);
    }

    .footer {
      padding: 28px 0;
      color: #dbe6e8;
      background: #18212f;
    }

    .footer .section-inner {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 12px;
      font-size: 0.92rem;
    }

    .admin-page {
      background: var(--mist);
    }

    .admin-hero {
      padding: 116px 0 34px;
      background: #fff;
    }

    .admin-section {
      padding-top: 34px;
    }

    .admin-layout {
      display: grid;
      gap: 20px;
    }

    .admin-editor {
      display: grid;
      gap: 16px;
    }

    .admin-panel {
      display: grid;
      gap: 14px;
      padding-top: 8px;
    }

    .admin-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .admin-toolbar h2,
    .board-panel h2 {
      margin: 0;
      font-size: 1.45rem;
    }

    .admin-toolbar-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .admin-toolbar-actions .button-secondary {
      border: 1px solid rgba(31, 138, 112, 0.18);
      background: #f5fcf8;
      color: var(--court-dark);
    }

    .admin-toolbar-actions .button-secondary:hover {
      background: #ebf8f1;
    }

    .admin-toolbar-actions .button-primary {
      background: linear-gradient(135deg, var(--coral), #ff8b74);
    }

    .admin-practice-list {
      display: grid;
      gap: 14px;
    }

    .admin-practice-card {
      display: grid;
      gap: 16px;
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: 8px;
      background: #fff;
      box-shadow: 0 12px 28px rgba(24, 33, 47, 0.08);
      transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
    }

    .admin-practice-card.is-new {
      border-color: rgba(31, 138, 112, 0.45);
      background: linear-gradient(135deg, #f8fffb 0%, #ffffff 100%);
      box-shadow: 0 16px 34px rgba(31, 138, 112, 0.16);
      transform: translateY(-1px);
      animation: admin-card-pulse 1.6s ease;
    }

    .admin-practice-card .is-focused {
      border-color: var(--court);
      box-shadow: 0 0 0 3px rgba(31, 138, 112, 0.16);
    }

    .admin-card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }

    .admin-card-header h3 {
      margin: 0;
      font-size: 1.08rem;
    }

    .admin-form-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .admin-wide {
      grid-column: 1 / -1;
    }

    .checkbox-label {
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 10px;
      min-height: 46px;
      padding-top: 22px;
    }

    @keyframes admin-card-pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(31, 138, 112, 0.22);
      }
      100% {
        box-shadow: 0 16px 34px rgba(31, 138, 112, 0.16);
      }
    }

    @media (max-width: 820px) {
      .nav {
        height: auto;
        min-height: 64px;
      }

      .nav-links {
        display: none;
      }

      .hero {
        min-height: auto;
        padding: 86px 0 36px;
      }

      .practice-grid,
      .circle-row,
      .circle-meta,
      .section-title,
      .board-layout,
      .contact-box {
        grid-template-columns: 1fr;
      }

      section {
        padding: 54px 0;
      }

      .practice-card {
        min-height: 0;
      }

      .schedule-scroll {
        grid-auto-columns: minmax(250px, 82vw);
      }

      .contact-box {
        align-items: stretch;
      }

      .contact-box .button {
        width: 100%;
      }

      .admin-toolbar,
      .admin-form-grid {
        grid-template-columns: 1fr;
      }

      .admin-toolbar {
        align-items: stretch;
        flex-direction: column;
      }
    }

    @media (max-width: 520px) {
      .hero-actions,
      .board-actions {
        flex-direction: column;
      }

      .button {
        width: 100%;
      }

      .board-panel,
      .practice-card,
      .contact-box {
        padding: 18px;
      }
    }