* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #333; background: #f9fafb; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header { background: linear-gradient(135deg, #0891b2 0%, #06b6d4 100%); color: white; padding: 1rem 0; box-shadow: 0 2px 10px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.header-content { display: flex; justify-content: space-between; align-items: center; gap: 2rem; }
.logo-section { display: flex; align-items: center; gap: 1rem; flex-shrink: 0; }
.logo-section img { height: 60px; width: auto; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.journal-title h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.25rem; }
.journal-title p { font-size: 0.85rem; opacity: 0.95; }
.header-right { display: flex; align-items: center; gap: 2rem; }
nav ul { display: flex; gap: 1.5rem; list-style: none; margin: 0; }
nav a { color: white; text-decoration: none; font-weight: 500; transition: opacity 0.2s; font-size: 0.95rem; }
nav a:hover { opacity: 0.8; }
.btn-submit-header { background: white; color: #0891b2; padding: 0.6rem 1.5rem; border-radius: 6px; text-decoration: none; font-weight: 600; transition: all 0.2s; border: none; cursor: pointer; white-space: nowrap; font-size: 0.95rem; }
.btn-submit-header:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255,255,255,0.3); }

/* Hero */
.hero { background: linear-gradient(135deg, #0891b2 0%, #06b6d4 100%); color: white; padding: 3rem 0; text-align: center; border-bottom: 4px solid #0e7490; }
.hero h2 { font-size: 2.2rem; margin-bottom: 0.5rem; font-weight: 700; }
.hero .subtitle { font-size: 1.1rem; opacity: 0.95; margin-bottom: 0.5rem; }
.hero .issn { font-size: 0.95rem; opacity: 0.85; }

/* Sections */
.section { padding: 3rem 0; background: white; }
.section:nth-child(even) { background: #f9fafb; }
.section-title { font-size: 1.8rem; text-align: center; margin-bottom: 2rem; color: #1f2937; font-weight: 700; }
.section-subtitle { text-align: center; color: #6b7280; margin-bottom: 2.5rem; max-width: 700px; margin-left: auto; margin-right: auto; }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.card { background: white; border-radius: 12px; padding: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,0.08); transition: all 0.2s; border: 1px solid #e5e7eb; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 16px rgba(0,0,0,0.12); }
.card h3 { color: #0891b2; margin-bottom: 0.75rem; font-size: 1.2rem; font-weight: 600; }
.issue-card { border-left: 4px solid #0891b2; }

/* Manuscript List */
.manuscript-list { display: flex; flex-direction: column; gap: 1rem; }
.manuscript-item { background: white; padding: 1.5rem; border-radius: 8px; border-left: 3px solid #0891b2; transition: all 0.2s; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.manuscript-item:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.12); transform: translateX(4px); }
.manuscript-title { font-size: 1.05rem; font-weight: 600; color: #1f2937; margin-bottom: 0.5rem; }
.manuscript-title a { color: #0891b2; text-decoration: none; }
.manuscript-title a:hover { text-decoration: underline; }
.manuscript-authors { color: #6b7280; font-size: 0.9rem; margin-bottom: 0.5rem; }
.manuscript-meta { color: #9ca3af; font-size: 0.85rem; }

/* Abstract */
.abstract { background: #f9fafb; padding: 1.5rem; border-radius: 8px; margin: 1.5rem 0; line-height: 1.8; border-left: 4px solid #0891b2; }
.abstract h2 { font-size: 1.3rem; margin-bottom: 1rem; }

/* PDF Locked */
.pdf-locked { display: inline-flex; align-items: center; gap: 0.5rem; background: #fee2e2; color: #991b1b; padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.9rem; margin-top: 1rem; }

/* Buttons */
.btn { display: inline-block; padding: 0.75rem 1.5rem; background: #0891b2; color: white; text-decoration: none; border-radius: 8px; font-weight: 600; transition: all 0.2s; border: none; cursor: pointer; }
.btn:hover { background: #0e7490; transform: translateY(-2px); }
.btn-secondary { background: transparent; border: 2px solid #0891b2; color: #0891b2; }
.btn-secondary:hover { background: #0891b2; color: white; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.stat-card { background: white; padding: 1.5rem; border-radius: 8px; text-align: center; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.stat-number { font-size: 2.5rem; font-weight: 700; color: #0891b2; margin-bottom: 0.5rem; }
.stat-label { color: #6b7280; font-size: 0.95rem; }

/* Footer */
footer { background: #1f2937; color: white; padding: 3rem 0 1rem; }
.footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
.footer-section h4 { margin-bottom: 1rem; color: #0891b2; font-size: 1.1rem; }
.footer-section ul { list-style: none; }
.footer-section a { color: #d1d5db; text-decoration: none; display: block; padding: 0.25rem 0; transition: color 0.2s; }
.footer-section a:hover { color: white; }
.footer-bottom { text-align: center; padding-top: 2rem; border-top: 1px solid #374151; color: #9ca3af; }

/* Submission Modal */
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); }
.modal.active { display: flex; align-items: center; justify-content: center; }
.modal-content { background: white; padding: 2rem; border-radius: 12px; max-width: 500px; width: 90%; max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
.modal-header h2 { color: #0891b2; margin: 0; }
.close-modal { background: none; border: none; font-size: 2rem; color: #6b7280; cursor: pointer; padding: 0; width: 30px; height: 30px; transition: color 0.2s; }
.close-modal:hover { color: #1f2937; }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #1f2937; }
.form-group input, .form-group textarea { width: 100%; padding: 0.75rem; border: 1px solid #d1d5db; border-radius: 6px; font-size: 1rem; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: #0891b2; box-shadow: 0 0 0 3px rgba(8,145,178,0.1); }
.file-upload { border: 2px dashed #d1d5db; padding: 2rem; text-align: center; border-radius: 8px; cursor: pointer; transition: all 0.2s; }
.file-upload:hover { border-color: #0891b2; background: #f0f9ff; }
.file-upload.has-file { border-color: #10b981; background: #f0fdf4; }
.file-name { margin-top: 1rem; color: #059669; font-weight: 600; }
.submit-btn { width: 100%; padding: 1rem; background: #0891b2; color: white; border: none; border-radius: 8px; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: background 0.2s; }
.submit-btn:hover { background: #0e7490; }
.submit-btn:disabled { background: #9ca3af; cursor: not-allowed; }
.success-message { text-align: center; padding: 2rem; }
.success-message svg { width: 80px; height: 80px; color: #10b981; margin-bottom: 1rem; }
.success-message h3 { color: #059669; margin-bottom: 1rem; }

/* Responsive */
@media (max-width: 768px) {
  .header-content { flex-direction: column; text-align: center; gap: 1rem; }
  .header-right { flex-direction: column; width: 100%; }
  nav ul { flex-wrap: wrap; justify-content: center; }
  .hero h2 { font-size: 1.8rem; }
  .logo-section img { height: 50px; }
  .journal-title h1 { font-size: 1.2rem; }
}

/* PDF Lock Icon */
.pdf-lock-icon { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.25rem; background: #f3f4f6; border: 1px solid #d1d5db; border-radius: 8px; margin-top: 1.5rem; }
.pdf-lock-icon svg { width: 24px; height: 24px; color: #6b7280; }