:root {
     --navy:      #1a3a5c;
     --sky:       #2e80c8;
     --sky-light: #e8f2fb;
     --sky-mid:   #c2dcf4;
     --text-jurnal:      #1d2530;
     --muted:     #5a6a7e;
     --border:    #d8e4ef;
   }
header .header-bottom {
    background-color: #f5f5f5;
}
body{
  background-color: #FFF;
}

.inner-wrapper {
    margin: 0 auto;
    padding-top: 15px;
}
       /* ─── BANNER ─── */
    .banner {
      background: var(--sky-light);
      border-bottom: 1px solid var(--sky-mid);
      border-top: 1px solid var(--sky-mid);
      padding: 20px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
    }
    .banner__title {
      font-size: 18px;
      font-weight: 700;
      color: var(--sky);
      margin-bottom: 4px;
    }
    .banner__desc {
      font-size: 13px;
      color: var(--muted);
      max-width: 640px;
    }
    .btn-send {
      flex-shrink: 0;
      background: var(--sky);
      color: #fff;
      border: none;
      padding: 10px 24px;
      border-radius: 6px;
      font-size: 13.5px;
      font-weight: 600;
      cursor: pointer;
      white-space: nowrap;
      transition: background .2s;
    }
    .btn-send:hover { background: var(--navy); }
/* ─── TOP NAV ─── */
    .top-nav {
      background: #fff;
    }
    .top-nav__inner {
      display: flex;
      flex-wrap: wrap;
    }
    .top-nav__link {
      display: block;
      padding: 15px 18px;
      font-size: 13.5px;
      font-weight: bold;
      color: var(--text-jurnal);
      text-decoration: none;
      border-bottom: 3px solid transparent;
      white-space: nowrap;
      transition: color .2s, border-color .2s;
    }
    .inner-wrapper a.top-nav__link  {
      text-decoration: none;
    }
    .top-nav__link:hover,
    .top-nav__link.is-active {
      color: var(--sky);
      border-bottom-color: var(--sky);
    }
     /* ─── SIDEBAR ─── */
    .sidebar__heading {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: .07em;
      color: var(--navy);
      margin-bottom: 10px;
    }
    .archive-nav {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 2px;
      margin:0;
      padding:0;
    }
    .archive-nav__link {
      display: block;
      padding: 15px 18px;
      font-size: 13px;
      font-weight: 500;
      color: var(--muted);
      text-decoration: none;
      transition: background .15s, color .15s;
    }
    .inner-wrapper a.archive-nav__link {
        text-decoration: none;
    }
    .archive-nav__link:hover {
      background: var(--sky-light);
      color: var(--sky);
    }
    .archive-nav__link.is-active {
      background: #f5f5f5;
      color: #282759;
      font-weight: 700;
      border-left: 3px solid #282759;
      padding-left: 15px;



      
    }
    .journal_contents{
      background: #fafafa;
      padding: 20px;
      border-radius: 8px;
    }
    /* ─── MAIN ─── */
    .issue-label {
      font-size: 12px;
      color: var(--muted);
      margin-bottom: 6px;
    }
    .issue-title {
      font-family: 'Merriweather', serif;
      font-size: 17px;
      font-weight: 700;
      color: var(--navy);
      line-height: 1.4;
      margin-bottom: 6px;
    }
    .inner-wrapper a.toc-link {
      font-size: 13px;
      color: #4888be;
      font-weight: 500;
      text-decoration: none;
    }
    .toc-link:hover { text-decoration: underline; }

    .divider {
      border: none;
      border-top: 1px solid var(--border);
      margin: 16px 0;
    }
/* ─── ARTICLE CARD ─── */
    .article-card {
      padding: 18px 0;
      border-bottom: 1px solid var(--border);
      transition: background .15s;
    }
    .article-card:last-child { border-bottom: none; }
    .article-card:hover { background: #f7fbff; }

    .article-card__title {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: #282759;
      line-height: 1.45;
      text-decoration: none;
      margin-bottom: 5px;
    }

    .article-card__authors {
      font-size: 12.5px;
      color: var(--muted);
      margin-bottom: 10px;
    }

    .article-card__footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 8px;
    }
    .inner-wrapper a.doi-link {
      font-size: 12px;
      color: #6390b8;
      text-decoration: none;
      word-break: break-all;
    }
    .doi-link:hover { text-decoration: underline; }

    .btn-pdf {
      flex-shrink: 0;
      background: var(--sky);
      color: #fff;
      border: none;
      padding: 6px 16px;
      border-radius: 5px;
      font-size: 12.5px;
      font-weight: 600;
      cursor: pointer;
      transition: background .2s;
    }
    .btn-pdf:hover { background: var(--navy); }

    /* ─── INDEXING ─── */
    .indexing__heading {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: .07em;
      color: var(--navy);
      margin-bottom: 12px;
    }
    .index-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .inner-wrapper .index-card *{
      line-height: 0 !important;
    }
    .index-card img{
      max-width: 100%;
      line-height: 0 !important;
    }
    .index-card a{
      line-height: 0 !important;
    }
    .index-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0px;
      transition: box-shadow .2s;
      line-height: 0 !important;
      overflow: hidden;
      margin-top: 15px;
    }
    .index-card:hover { box-shadow: 0 2px 10px rgba(46,128,200,.13); }
    .index-card span {
      font-weight: 700;
      letter-spacing: .03em;
      text-align: center;
      line-height: 1.4;
    }

    /* ─── MOBILE ARCHIVE TOGGLE ─── */
    .archive-toggle {
      display: none;
      width: 100%;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 9px 14px;
      font-size: 13.5px;
      font-weight: 600;
      color: var(--navy);
      cursor: pointer;
      text-align: left;
      margin-bottom: 8px;
    }
    .archive-toggle::after {
      content: ' ▾';
      font-size: 11px;
    }
    .archive-toggle.is-open::after { content: ' ▴'; }

    .material-modal {
      position: fixed;
      inset: 0;
      z-index: 9999;
      display: none;
      align-items: center;
      justify-content: center;
      padding: 18px;
    }
    .material-modal.is-open {
      display: flex;
    }
    .material-modal-open {
      overflow: hidden;
    }
    .material-modal__overlay {
      position: absolute;
      inset: 0;
      background: rgba(19, 27, 38, .55);
    }
    .material-modal__dialog {
      position: relative;
      width: min(527px, 100%);
      max-height: calc(100vh - 36px);
      overflow-y: auto;
      background: #fff;
      border-radius: 7px;
      box-shadow: 0 20px 60px rgba(19, 27, 38, .28);
      padding: 34px 22px 24px;
      color: #282759;
    }
    .material-modal__close {
      position: absolute;
      top: 10px;
      right: 14px;
      width: 30px;
      height: 30px;
      border: 0;
      background: transparent;
      color: #8b94a3;
      font-size: 28px;
      line-height: 1;
      cursor: pointer;
    }
    .material-modal__title {
      margin: 0 0 26px;
      padding-bottom: 14px;
      border-bottom: 1px solid #d9d9d9;
      color: #3d86bd;
      font-size: 18px;
      font-weight: 700;
      text-align: center;
      line-height: 1.2;
    }
    .material-form__row {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }
    .material-form__group {
      display: block;
      margin-bottom: 13px;
      color: #282759;
      font-size: 14px;
      font-weight: 700;
      line-height: 1.2;
    }
    .material-form__group span {
      display: block;
      margin-bottom: 8px;
    }
    .material-form__group input[type="text"],
    .material-form__group input[type="email"] {
      width: 100%;
      height: 46px;
      border: 1px solid #d7dde3;
      border-radius: 4px;
      padding: 0 18px;
      color: #282759;
      font-size: 14px;
      font-weight: 400;
      outline: none;
      transition: border-color .18s, box-shadow .18s;
    }
    .material-form__group input:focus {
      border-color: #3d86bd;
      box-shadow: 0 0 0 3px rgba(61, 134, 189, .12);
    }
    .material-form__group input::placeholder {
      color: #b4bac3;
    }
    .material-upload {
      min-height: 181px;
      border: 1px dashed #d5d9de;
      border-radius: 7px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 24px 16px;
      cursor: pointer;
      text-align: center;
      transition: border-color .18s, background .18s;
    }
    .material-upload:hover,
    .material-upload.is-dragover {
      border-color: #3d86bd;
      background: #f7fbff;
    }
    .material-upload input {
      position: absolute;
      width: 1px;
      height: 1px;
      opacity: 0;
      pointer-events: none;
    }
    .material-upload__icon {
      color: #b5bac1;
      font-size: 24px;
      margin-bottom: 11px;
    }
    .material-upload strong {
      max-width: 100%;
      color: #282759;
      font-size: 16px;
      font-weight: 500;
      line-height: 1.35;
      overflow-wrap: anywhere;
    }
    .material-upload small {
      display: block;
      margin-top: 8px;
      color: #b1b6bf;
      font-size: 13px;
      font-weight: 500;
      line-height: 1.35;
    }
    .material-upload__button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 66px;
      height: 36px;
      margin-top: 12px;
      border-radius: 10px;
      background: #3d86bd;
      color: #fff;
      font-size: 14px;
      font-weight: 700;
      line-height: 36px;
    }
    .material-form__group em{
      color: red;
    }
    .material-captcha__field {
      position: relative;
    }
    .material-captcha__field input {
      padding-right: 140px;
    }
    .material-captcha__field img {
      position: absolute;
      right: 7px;
      top: 7px;
      width: 120px;
      height: 32px;
      border: 1px solid #d7dde3;
      cursor: pointer;
      background: #fff;
    }
    .material-form__actions {
      display: flex;
      justify-content: flex-end;
      margin-top: 20px;
    }
    .material-submit {
      min-width: 172px;
      height: 40px;
      padding: 0 20px;
      border-radius: 8px;
      font-size: 16px;
    }
    .material-submit:disabled {
      cursor: not-allowed;
      opacity: .55;
    }
    .material-form__alert {
      display: none;
      margin-bottom: 14px;
      border-radius: 4px;
      padding: 10px 12px;
      font-size: 13px;
      font-weight: 600;
      line-height: 1.4;
    }
    .material-form__alert.is-error {
      display: block;
      background: #fff0f0;
      color: #b42318;
      border: 1px solid #ffd0d0;
    }
    .material-form__alert.is-success {
      display: block;
      background: #eef9f1;
      color: #1f7a3b;
      border: 1px solid #cbeed3;
    }

    @media (max-width: 575px) {
      .material-modal__dialog {
        padding: 30px 16px 20px;
      }
      .material-form__row {
        grid-template-columns: 1fr;
        gap: 0;
      }
      .material-upload strong {
        font-size: 14px;
      }
      .material-captcha__field input {
        padding-right: 18px;
      }
      .material-captcha__field img {
        position: static;
        display: block;
        margin-top: 8px;
      }
      .material-form__actions,
      .material-submit {
        width: 100%;
      }
    }