/* ==========================================================================
   IJMEER - Premium World-Class Academic Journal Design
   ========================================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Source+Serif+4:wght@400;500;600;700&display=swap');

/* CSS Variables */
:root {
  --primary: #0A2540;
  --primary-light: #1A365D;
  --accent: #0073E6;
  --accent-hover: #005BB5;
  --accent-light: rgba(0, 115, 230, 0.08);
  --success: #059669;
  --warning: #D97706;
  --danger: #DC2626;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; }

/* Container */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ==========================================================================
   HEADER - Premium Glass Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: var(--transition);
}
.header.scrolled {
  box-shadow: var(--shadow);
  background: rgba(255, 255, 255, 0.98);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 32px;
}

/* Brand */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.brand-logo {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.5px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.brand-tagline {
  font-size: 0.7rem;
  color: var(--gray-500);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Navigation */
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  color: var(--gray-700);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--primary);
  background: var(--gray-50);
}

/* Submit Button - Highlighted */
.nav-item-submit .nav-link {
  background: var(--primary);
  color: white;
  padding: 10px 24px;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(10, 37, 64, 0.25);
}
.nav-item-submit .nav-link:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(10, 37, 64, 0.3);
}

/* Chevron */
.chevron {
  width: 14px;
  height: 14px;
  transition: transform 0.2s;
}
.has-dropdown:hover .chevron {
  transform: rotate(180deg);
}

/* Dropdown */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-100);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s ease;
  z-index: 100;
}
.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.dropdown-item {
  display: block;
  padding: 10px 16px;
  color: var(--gray-700);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.dropdown-item:hover {
  background: var(--accent-light);
  color: var(--accent);
}

/* Mobile Toggle */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}
.navbar-toggle span {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: var(--transition);
}

/* ==========================================================================
   TOPBAR - Minimal Info Bar
   ========================================================================== */
.topbar {
  background: var(--primary);
  color: rgba(255,255,255,0.9);
  font-size: 0.8rem;
  padding: 8px 0;
  display: none;
}

/* ==========================================================================
   HERO - Bold Introduction
   ========================================================================== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 60%;
  height: 100%;
  background: radial-gradient(ellipse at 70% 20%, rgba(0, 115, 230, 0.06) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content { max-width: 720px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-description {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: 32px;
  max-width: 600px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(10, 37, 64, 0.2);
}
.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(10, 37, 64, 0.3);
  color: white;
}
.btn-accent {
  background: var(--accent);
  color: white;
  box-shadow: 0 2px 8px rgba(0, 115, 230, 0.3);
}
.btn-accent:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 115, 230, 0.4);
  color: white;
}
.btn-submit {
  background: linear-gradient(135deg, var(--success), #047857);
  color: white;
  padding: 16px 32px;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.4);
}
.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.5);
  color: white;
}
.btn-outline {
  background: transparent;
  color: var(--gray-700);
  border: 2px solid var(--gray-200);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--gray-50);
}
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-sm { padding: 8px 16px; font-size: 0.8rem; }

/* ==========================================================================
   CARDS
   ========================================================================== */
.card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  overflow: hidden;
  transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow-lg); }
.card-body { padding: 32px; }
.card h2 { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 600; color: var(--primary); margin-bottom: 16px; }
.card h3 { font-size: 1.125rem; font-weight: 600; color: var(--primary); margin-bottom: 12px; }
.card p { color: var(--gray-600); margin-bottom: 16px; }
.card ul { padding-left: 20px; }
.card li { color: var(--gray-600); margin-bottom: 8px; }
.card:last-child { margin-bottom: 0; }

/* ==========================================================================
   SECTIONS
   ========================================================================== */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}
.section-subtitle { font-size: 1.1rem; color: var(--gray-500); max-width: 600px; margin: 0 auto; }

/* ==========================================================================
   PAGE HEADER
   ========================================================================== */
.page-header {
  padding: 140px 0 60px;
  background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
  border-bottom: 1px solid var(--gray-100);
}
.page-header-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 16px;
}
.page-header-breadcrumb a { color: var(--gray-500); }
.page-header-breadcrumb a:hover { color: var(--accent); }
.page-header-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--primary);
}

/* ==========================================================================
   GRIDS & LAYOUTS
   ========================================================================== */
.d-grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.d-flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.gap-sm { gap: 12px; }
.gap-md { gap: 24px; }
.gap-lg { gap: 40px; }

/* ==========================================================================
   SUBJECT BOXES
   ========================================================================== */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}
.subject-box {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-700);
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.subject-box:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* ==========================================================================
   STATISTICS / METRICS
   ========================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}
.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.stat-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
}
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.875rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* ==========================================================================
   DEADLINE TIMELINE
   ========================================================================== */
.timeline-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-100);
}
.timeline-quarters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.quarter-item {
  padding: 20px;
  background: var(--gray-50);
  border-radius: var(--radius);
  border: 2px solid transparent;
  transition: var(--transition);
}
.quarter-item.active {
  border-color: var(--accent);
  background: var(--accent-light);
}
.quarter-name {
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.quarter-deadline, .quarter-pub {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 4px;
}

/* ==========================================================================
   BOARD CARDS
   ========================================================================== */
.board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.board-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.board-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.board-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
}
.board-name { font-size: 1.1rem; font-weight: 600; color: var(--primary); margin-bottom: 4px; }
.board-role { font-size: 0.8rem; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.board-affiliation { font-size: 0.875rem; color: var(--gray-600); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background: var(--primary);
  color: rgba(255,255,255,0.8);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .navbar-brand { margin-bottom: 16px; }
.footer-brand .brand-name { color: white; }
.footer-brand .brand-logo { background: rgba(255,255,255,0.1); }
.footer-description { font-size: 0.9rem; line-height: 1.7; }
.footer-heading {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-links a:hover { color: white; }
.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.85rem;
}
.footer-copyright { color: rgba(255,255,255,0.5); }
.footer-copyright a { color: rgba(255,255,255,0.7); }
.footer-copyright a:hover { color: white; }

/* ==========================================================================
   SCROLL TOP
   ========================================================================== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}
.scroll-top.visible { opacity: 1; visibility: visible; }
.scroll-top:hover { background: var(--primary-light); transform: translateY(-4px); }

/* ==========================================================================
   SEARCH BAR
   ========================================================================== */
.search-bar {
  position: relative;
  max-width: 500px;
}
.search-input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.95rem;
  transition: var(--transition);
}
.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 115, 230, 0.1);
}
.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
}

/* ==========================================================================
   BADGES
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 50px;
}
.badge-primary { background: var(--accent-light); color: var(--accent); }
.badge-success { background: rgba(5, 150, 105, 0.1); color: var(--success); }
.badge-warning { background: rgba(217, 119, 6, 0.1); color: var(--warning); }

/* ==========================================================================
   ALERTS
   ========================================================================== */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius);
  margin-bottom: 24px;
}
.alert-info { background: var(--accent-light); color: var(--accent); }
.alert-warning { background: rgba(217, 119, 6, 0.1); color: var(--warning); }
.alert svg { flex-shrink: 0; width: 24px; height: 24px; }

/* ==========================================================================
   PAYMENT BOX
   ========================================================================== */
.payment-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  color: white;
}
.payment-box-title { font-size: 0.9rem; font-weight: 600; opacity: 0.8; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.payment-price { font-size: 2.5rem; font-weight: 800; }
.payment-price span { font-size: 1rem; font-weight: 400; opacity: 0.7; }

/* ==========================================================================
   INFO CARD
   ========================================================================== */
.info-card {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--gray-100);
}
.info-card-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 16px;
}
.info-card-title { font-size: 1rem; font-weight: 600; color: var(--primary); margin-bottom: 8px; }
.info-card-desc { font-size: 0.875rem; color: var(--gray-600); }

/* ==========================================================================
   SIDEBAR
   ========================================================================== */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}
.content-main { min-width: 0; }
.content-sidebar { position: sticky; top: 100px; }
.sidebar-widget {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  overflow: hidden;
  margin-bottom: 24px;
}
.sidebar-widget-header {
  padding: 16px 20px;
  background: var(--gray-50);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
}
.sidebar-widget-body { padding: 20px; }
.sidebar-list { display: flex; flex-direction: column; gap: 12px; }
.sidebar-list-item {
  font-size: 0.875rem;
  color: var(--gray-600);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--gray-100);
}
.sidebar-list-item:last-child { border-bottom: none; padding-bottom: 0; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px) {
  .navbar-nav { gap: 0; }
  .nav-link { padding: 10px 12px; font-size: 0.85rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .content-layout { grid-template-columns: 1fr; }
  .content-sidebar { position: static; }
}

@media (max-width: 768px) {
  .navbar-toggle { display: flex; }
  .navbar-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    flex-direction: column;
    padding: 24px;
    gap: 4px;
    transform: translateX(-100%);
    transition: var(--transition);
    overflow-y: auto;
    border-top: 1px solid var(--gray-100);
  }
  .navbar-nav.active { transform: translateX(0); }
  .nav-item { width: 100%; }
  .nav-link { padding: 14px 16px; justify-content: space-between; }
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 0 0 0 16px;
    background: var(--gray-50);
    border-radius: var(--radius);
    margin-top: 4px;
    display: none;
  }
  .has-dropdown.open .dropdown-menu { display: block; }
  .dropdown-item { padding: 12px 16px; }
  .nav-item-submit { order: -1; }
  .nav-item-submit .nav-link { text-align: center; justify-content: center; }
  .hero { padding: 120px 0 60px; }
  .hero-title { font-size: 2rem; }
  .section { padding: 48px 0; }
  .card-body { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .subjects-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .timeline-quarters { grid-template-columns: 1fr; }
}

/* Animations */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fadeInUp { animation: fadeInUp 0.6s ease forwards; }

/* Counter animation placeholder */
[data-count] { font-variant-numeric: tabular-nums; }