:root {
  --green-primary: #1b4332;
  --green-secondary: #2d6a4f;
  --green-accent: #40916c;
  --green-light: #52b788;
  --green-pale: #d8f3dc;
  --green-ultra-light: #f4fbf7;
  --dark-text: #1d2d24;
  --muted-text: #52645a;
  --border-color: #d1e3d7;
  --bg-color: #f8faf8;
  --white: #ffffff;
  --shadow: 0 4px 15px rgba(27, 67, 50, 0.08);
  --shadow-hover: 0 8px 25px rgba(27, 67, 50, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--dark-text); line-height: 1.6; }
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }
a { color: var(--green-secondary); text-decoration: none; }

.navbar { background-color: var(--green-primary); color: var(--white); padding: 15px 0; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.15); }
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1240px; margin: 0 auto; padding: 0 20px; }
.brand-identity { display: flex; align-items: center; gap: 15px; }
.logo { height: 50px; width: 50px; border-radius: 50%; object-fit: cover; border: 2px solid var(--green-light); }
.journal-title-box { display: flex; flex-direction: column; }
.academy-name { font-size: 0.75rem; color: var(--green-light); text-transform: uppercase; font-weight: 600; }
.journal-name { font-size: 1.05rem; font-weight: 700; color: var(--white); }
.issn-tag { font-size: 0.7rem; color: rgba(255,255,255,0.8); }

.nav-menu { display: flex; align-items: center; gap: 15px; }
.nav-link { color: rgba(255,255,255,0.9); font-weight: 500; font-size: 0.9rem; padding: 6px 10px; border-radius: 4px; }
.nav-link:hover, .nav-link.active { background-color: var(--green-secondary); color: var(--white); }
.admin-btn { background-color: var(--green-accent); color: var(--white); border: none; padding: 8px 14px; border-radius: 6px; cursor: pointer; font-weight: 600; display: flex; align-items: center; gap: 6px; }
.admin-btn:hover { background-color: var(--green-light); color: var(--green-primary); }
.mobile-toggle { display: none; background: none; border: none; color: var(--white); font-size: 1.5rem; cursor: pointer; }

.hero-section {
    background: linear-gradient(135deg, #015278 0%, #003961 100%);
    color: #ffffff;
    padding: 45px 0;
    border-bottom: 4px solid #0539f7;
    text-align: center;
}
.badge { display: inline-block; background-color: var(--green-accent); font-size: 0.75rem; font-weight: 700; padding: 4px 12px; border-radius: 20px; text-transform: uppercase; margin-bottom: 12px; }
.hero-content h2 { font-size: 1.8rem; margin-bottom: 10px; }
.hero-content p { color: var(--green-pale); font-size: 1rem; }

.search-section { background: var(--white); padding: 20px 0; box-shadow: 0 4px 12px rgba(0,0,0,0.03); margin-bottom: 35px; }
.search-bar-wrapper { display: flex; gap: 15px; align-items: center; }
.search-input-box { flex: 1; position: relative; display: flex; align-items: center; }
.search-input-box i { position: absolute; left: 15px; color: var(--muted-text); }
.search-input-box input { width: 100%; padding: 10px 15px 10px 45px; border: 2px solid var(--border-color); border-radius: 8px; font-size: 0.95rem; outline: none; }
.year-filter-box { display: flex; align-items: center; gap: 8px; }
.year-filter-box select { padding: 10px 12px; border: 2px solid var(--border-color); border-radius: 8px; background: var(--white); cursor: pointer; }

.section-header { text-align: center; margin-bottom: 30px; }
.section-header h2 { color: var(--green-primary); font-size: 1.6rem; margin-bottom: 6px; }
.section-header p { color: var(--muted-text); font-size: 0.9rem; }

/* 4-column desktop layout */
.issues-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 45px; }
.issue-card { background: var(--white); border-radius: 8px; border: 1px solid var(--border-color); box-shadow: var(--shadow); overflow: hidden; display: flex; flex-direction: column; }
.cover-wrapper { position: relative; width: 100%; padding-top: 130%; background-color: var(--green-primary); }
.cover-wrapper img { position: absolute; top:0; left:0; width:100%; height:100%; object-fit: cover; }
.cover-overlay { position: absolute; top: 8px; right: 8px; background: var(--green-primary); color: var(--white); font-size: 0.7rem; font-weight: 700; padding: 3px 6px; border-radius: 4px; }
.issue-info { padding: 15px; display: flex; flex-direction: column; flex-grow: 1; }
.issue-info h3 { font-size: 1rem; color: var(--green-primary); margin-bottom: 4px; }
.issue-meta { font-size: 0.75rem; color: var(--muted-text); margin-bottom: 10px; }

.issue-actions-row { display: flex; gap: 6px; margin-bottom: 10px; }

.articles-toggle-btn { width: 100%; background-color: var(--green-ultra-light); border: 1px solid var(--border-color); color: var(--green-primary); padding: 6px 10px; font-size: 0.8rem; font-weight: 600; border-radius: 4px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; margin-top: auto; }
.articles-toggle-btn:hover { background-color: var(--green-pale); }

.articles-collapse-content { display: none; border-top: 1px solid var(--border-color); padding-top: 8px; margin-top: 8px; max-height: 250px; overflow-y: auto; }
.articles-collapse-content.open { display: block; }

.paper-item { padding: 6px 0; border-bottom: 1px dashed #e5efe9; }
.paper-title { font-size: 0.8rem; font-weight: 600; color: var(--dark-text); margin-bottom: 2px; }
.paper-authors { font-size: 0.7rem; color: var(--muted-text); }
.paper-actions { display: flex; gap: 6px; margin-top: 4px; }
.btn-pdf { display: inline-flex; align-items: center; gap: 4px; font-size: 0.7rem; background-color: var(--green-pale); color: var(--green-primary); padding: 4px 8px; border-radius: 4px; font-weight: 600; cursor: pointer; border: none; }
.btn-pdf:hover { background-color: var(--green-accent); color: var(--white); }

/* SCOPUS & Editorial Sections */
.scopus-section { background-color: var(--green-ultra-light); padding: 45px 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); margin-bottom: 45px; }
.standards-grid, .editorial-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; }
.policy-card, .editor-card { background: var(--white); padding: 20px; border-radius: 8px; border: 1px solid var(--border-color); text-align: center; }
.policy-card i { font-size: 1.8rem; color: var(--green-secondary); margin-bottom: 10px; }
.policy-card h3, .editor-card h3 { font-size: 0.95rem; color: var(--green-primary); margin-bottom: 6px; }
.policy-card p, .editor-card p { font-size: 0.8rem; color: var(--muted-text); }
.editor-avatar { width: 50px; height: 50px; border-radius: 50%; background-color: var(--green-secondary); color: var(--white); display: flex; align-items: center; justify-content: center; font-weight: 700; margin: 0 auto 10px; font-size: 0.85rem; }
.editor-role { display: block; font-size: 0.75rem; color: var(--green-accent); font-weight: 600; margin-bottom: 6px; }

/* Footer */
.footer { background-color: var(--green-primary); color: var(--white); padding: 35px 0 0; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding-bottom: 25px; }
.footer-col h3, .footer-col h4 { margin-bottom: 12px; font-size: 1rem; }
.footer-col p, .footer-col ul li a { font-size: 0.8rem; color: rgba(255,255,255,0.8); margin-bottom: 6px; }
.footer-col ul { list-style: none; }
.footer-bottom { background-color: #122f23; text-align: center; padding: 12px 0; font-size: 0.75rem; color: rgba(255,255,255,0.6); }

/* Modals */
.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 2000; align-items: center; justify-content: center; }
.modal.active { display: flex; }
.modal-content { background: var(--white); width: 90%; max-width: 850px; max-height: 90vh; border-radius: 8px; padding: 20px; position: relative; display: flex; flex-direction: column; overflow-y: auto; }
.modal-close { position: absolute; top: 12px; right: 15px; background: none; border: none; font-size: 1.6rem; color: var(--muted-text); cursor: pointer; }
.modal-header h3 { color: var(--green-primary); font-size: 1.15rem; padding-right: 25px; }
.modal-meta { font-size: 0.8rem; color: var(--muted-text); margin: 4px 0; }
.doi-box { background-color: var(--green-ultra-light); padding: 6px 10px; border-radius: 4px; font-size: 0.75rem; display: flex; align-items: center; justify-content: space-between; margin: 8px 0; }
.copy-btn { background-color: var(--green-secondary); color: var(--white); border: none; padding: 3px 8px; border-radius: 4px; cursor: pointer; font-size: 0.7rem; }
.pdf-viewer-container { flex-grow: 1; min-height: 400px; border: 1px solid var(--border-color); border-radius: 4px; margin-top: 8px; }
.pdf-viewer-container iframe { width: 100%; height: 100%; border: none; }

/* Admin Forms */
.admin-form-content { max-width: 750px; }
.form-group { margin-bottom: 10px; }
.form-group label { display: block; font-size: 0.75rem; font-weight: 600; margin-bottom: 3px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 8px 10px; border: 1px solid var(--border-color); border-radius: 4px; font-size: 0.85rem; outline: none; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.submit-btn { width: 100%; background-color: var(--green-primary); color: var(--white); border: none; padding: 10px; border-radius: 4px; font-weight: 600; cursor: pointer; margin-top: 8px; }
.submit-btn:hover { background-color: var(--green-secondary); }
.tab-btn { background: none; border: none; padding: 6px 10px; font-weight: 600; cursor: pointer; border-bottom: 2px solid transparent; color: var(--muted-text); font-size: 0.85rem; }
.tab-btn.active-tab { border-bottom-color: var(--green-primary); color: var(--green-primary); }

@media (max-width: 1024px) {
  .issues-grid, .standards-grid, .editorial-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-content { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .nav-menu { display: none; position: absolute; top: 100%; left: 0; width: 100%; background-color: var(--green-primary); flex-direction: column; padding: 15px; box-shadow: 0 5px 15px rgba(0,0,0,0.2); }
  .nav-menu.active { display: flex; }
  .search-bar-wrapper { flex-direction: column; }
  .year-filter-box { width: 100%; justify-content: space-between; }
  .issues-grid, .standards-grid, .editorial-grid { grid-template-columns: 1fr; }
}