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

body {
  font-family: "Inter", sans-serif;
  background-color: #f8fafc;
  color: #0f172a;
  scroll-behavior: smooth;
}

/* custom navbar & brand */
.navbar-brand {
  font-weight: 800;
  font-size: 1.7rem;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #1e3c72 0%, #2b4f8c 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.nav-link {
  font-weight: 600;
  color: #1e293b;
  transition: 0.2s;
}

.nav-link:hover {
  color: #2b6a9f;
}

/* hero section */
.hero-section {
  background: linear-gradient(105deg, #ffffff 0%, #f1f5f9 100%);
  border-bottom: 1px solid #e2e8f0;
  padding: 3rem 0 2rem 0;
}

.impact-badge {
  background-color: #0b3b5f;
  color: white;
  border-radius: 40px;
  padding: 0.3rem 1rem;
  font-weight: 600;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary-custom {
  background: #1e4a76;
  border: none;
  padding: 0.7rem 1.6rem;
  font-weight: 600;
  border-radius: 40px;
  transition: 0.2s;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.btn-primary-custom:hover {
  background: #0f3a5c;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-success-custom {
  background: #72e903;
  border: none;
  padding: 0.7rem 1.6rem;
  font-weight: 600;
  border-radius: 40px;
  transition: 0.2s;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.btn-success-custom:hover {
  background: #72e903;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-danger-custom {
  background: #ff3535;
  border: none;
  padding: 0.7rem 1.6rem;
  font-weight: 600;
  border-radius: 40px;
  transition: 0.2s;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.btn-danger-custom:hover {
  background: #ff3535;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-outline-custom {
  border: 2px solid #1e4a76;
  color: #1e4a76;
  padding: 0.7rem 1.6rem;
  font-weight: 600;
  border-radius: 40px;
  background: transparent;
  transition: 0.2s;
}

.btn-outline-custom:hover {
  background: #1e4a76;
  color: white;
  transform: translateY(-2px);
}

.card-article {
  border: none;
  border-radius: 24px;
  background: white;
  transition: all 0.25s ease;
  box-shadow:
    0 8px 20px rgba(0, 0, 0, 0.02),
    0 2px 6px rgba(0, 0, 0, 0.05);
}

.card-article:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 30px -12px rgba(0, 0, 0, 0.12);
}

.callout-card {
  background: linear-gradient(125deg, #eef2ff 0%, #ffffff 100%);
  border-radius: 32px;
  padding: 2rem;
  border: 1px solid #e0e7ff;
}

.footer {
  background-color: #0b1e2e;
  color: #cbd5e1;
  border-top: 1px solid #1e2f3f;
}

.footer a {
  color: #94a3b8;
  text-decoration: none;
  transition: 0.2s;
}

.footer a:hover {
  color: white;
  text-decoration: underline;
}

.issn-badge {
  font-family: monospace;
  background: #e9ecef;
  display: inline-block;
  padding: 0.2rem 1rem;
  border-radius: 30px;
  font-size: 0.85rem;
}

.article-meta {
  font-size: 0.85rem;
  color: #475569;
  border-top: 1px solid #eef2f6;
  padding-top: 0.75rem;
  margin-top: 0.75rem;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  letter-spacing: -0.3px;
}

.text-gradient {
  background: linear-gradient(120deg, #1e3c72, #2c5a8c);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.shadow-soft {
  box-shadow:
    0 10px 25px -5px rgba(0, 0, 0, 0.05),
    0 8px 10px -6px rgba(0, 0, 0, 0.02);
}
.shadow-soft {
  box-shadow:
    0 10px 25px -5px rgba(0, 0, 0, 0.05),
    0 8px 10px -6px rgba(0, 0, 0, 0.02);
}
.icon {
  width: 40px;
  height: 40pxp;
}

.icon-lx {
  width: 100px;
  height: 100pxp;
}

.icon,
.icon-lx {
  margin-right: 10px;
}

.issue-card {
  background: white;
  border-radius: 28px;
  border: none;
  transition: all 0.25s ease;
  box-shadow:
    0 8px 20px rgba(0, 0, 0, 0.03),
    0 2px 5px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

.issue-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.12);
}

.issue-header {
  background: #f8fafc;
  border-bottom: 2px solid #e2edf7;
  padding: 1.2rem 1.5rem;
}

.volume-year {
  font-weight: 800;
  font-size: 1.5rem;
  color: #1e4a76;
}

.article-item {
  border-left: 3px solid transparent;
  transition: 0.15s;
  padding: 0.9rem 0;
  border-bottom: 1px solid #ecf3f9;
}

.article-item:hover {
  border-left-color: #1e4a76;
  background-color: #fafeff;
  padding-left: 0.5rem;
}

.article-title {
  font-weight: 700;
  font-size: 1rem;
  color: #0f2c3f;
  margin-bottom: 0.35rem;
}

.authors-list {
  font-size: 0.85rem;
  color: #2c5a7a;
  font-weight: 500;
}

.article-meta-info {
  font-size: 0.75rem;
  color: #5f7f9c;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.3rem;
}

.pagination-custom .page-link {
  color: #1e4a76;
  border-radius: 50px;
  margin: 0 4px;
  font-weight: 500;
}

.pagination-custom .active .page-link {
  background-color: #1e4a76;
  border-color: #1e4a76;
  color: white;
}

.shadow-soft {
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.02);
}

.btn-outline-archive {
  border: 1.5px solid #1e4a76;
  color: #1e4a76;
  border-radius: 40px;
  padding: 0.3rem 1.2rem;
  font-weight: 600;
  transition: 0.2s;
}

.btn-outline-archive:hover {
  background: #1e4a76;
  color: white;
}

/*** call paper */
.hero-cfp {
  background: linear-gradient(115deg, #eef2fc 0%, #ffffff 100%);
  border-bottom: 1px solid #cde0ed;
  padding: 3rem 0 2rem;
}

.badge-impact {
  background-color: #1e4a76;
  color: white;
  padding: 0.4rem 1.2rem;
  border-radius: 40px;
  font-weight: 500;
}

.btn-cfp-primary {
  background: #dc2626;
  color: white;
  border-radius: 60px;
  padding: 0.7rem 2rem;
  font-weight: 700;
  transition: 0.2s;
  border: none;
}

.btn-cfp-primary:hover {
  background: #b91c1c;
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-cfp-outline {
  border: 2px solid #1e4a76;
  background: white;
  color: #1e4a76;
  border-radius: 60px;
  padding: 0.7rem 2rem;
  font-weight: 700;
}

.btn-cfp-outline:hover {
  background: #1e4a76;
  color: white;
}
.info-card {
  background: white;
  border-radius: 28px;
  border: none;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.03);
  transition: 0.2s;
  height: 100%;
}

.deadline-card {
  background: #fff7eb;
  border-left: 5px solid #f59e0b;
}

.instruction-list {
  list-style-type: none;
  padding-left: 0;
}

.instruction-list li {
  margin-bottom: 0.75rem;
  padding-left: 1.8rem;
  position: relative;
}

.instruction-list li:before {
  content: "✓";
  color: #1e4a76;
  font-weight: bold;
  position: absolute;
  left: 0;
}

.journal-table {
  border-radius: 20px;
  overflow: hidden;
}

/***Current Issue*/
/* Issue Header */
.issue-header-block {
  background: linear-gradient(105deg, #eef4fc 0%, #ffffff 100%);
  border-bottom: 1px solid #cde0ed;
  padding: 2.8rem 0 2rem;
}

.badge-volume {
  background: #1e4a76;
  color: white;
  padding: 0.4rem 1rem;
  border-radius: 40px;
  font-weight: 500;
}

.btn-pdf {
  background: #dc2626;
  color: white;
  border-radius: 40px;
  padding: 0.5rem 1.5rem;
  font-weight: 600;
  transition: 0.2s;
}

.btn-pdf:hover {
  background: #b91c1c;
  transform: translateY(-2px);
}

.btn-citation {
  border: 1.5px solid #1e4a76;
  background: white;
  color: #1e4a76;
  border-radius: 40px;
  padding: 0.5rem 1.5rem;
  font-weight: 600;
  transition: 0.2s;
}

.btn-citation:hover {
  background: #1e4a76;
  color: white;
}

.meta-info {
  border-left: 4px solid #1e4a76;
  background: #fafdff;
  border-radius: 20px;
}