/* ==========================================================================
   CONFLUENCE INTERNATIONAL JOURNAL OF RESEARCH (CIJR)
   Modern Academic Theme & Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Color Palette */
  --color-primary: #0a2540;
  --color-primary-dark: #06182a;
  --color-primary-light: #153e6b;
  --color-accent: #0284c7;
  --color-accent-hover: #0369a1;
  --color-gold: #d97706;
  --color-emerald: #059669;
  --color-rose: #e11d48;

  /* Surfaces & Neutrals */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #e2e8f0;

  /* Text & Border */
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --text-inverse: #ffffff;
  --border-light: #e2e8f0;
  --border-subtle: #cbd5e1;
  --border-focus: #0284c7;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.03);

  /* Radii & Transitions */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --container-max: 1240px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   TOP BAR & HEADER
   ========================================================================== */

.top-notice-bar {
  background-color: var(--color-primary-dark);
  color: #94a3b8;
  font-size: 0.8125rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.top-notice-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.issn-pill {
  font-family: var(--font-mono);
  font-weight: 500;
  background: rgba(255,255,255,0.08);
  color: #e2e8f0;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-sm);
}

.top-auth-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.top-auth-links a {
  color: #cbd5e1;
  font-size: 0.8125rem;
}
.top-auth-links a:hover {
  color: #ffffff;
}

/* Main Navbar */
.site-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-xs);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.5rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
}

.brand-logo-img {
  height: 52px;
  width: auto;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.15;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-subtle);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 0.5rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-muted);
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-accent);
  background-color: var(--bg-subtle);
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg-card);
  min-width: 220px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.5rem 0;
  list-style: none;
  display: none;
  z-index: 105;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  display: block;
}

.dropdown-link {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.dropdown-link:hover {
  background-color: var(--bg-subtle);
  color: var(--color-accent);
}

.btn-header-submit {
  background: var(--color-primary);
  color: #ffffff !important;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xs);
  transition: var(--transition);
}

.btn-header-submit:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-primary);
  cursor: pointer;
}

/* ==========================================================================
   HERO / BANNER SECTION
   ========================================================================== */

.hero-section {
  background: linear-gradient(135deg, #0a2540 0%, #153e6b 60%, #0c4a6e 100%);
  color: #ffffff;
  padding: 4.5rem 0 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero-section::after {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background: radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #e0f2fe;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.75rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-banner-ribbon {
  font-size: 1.125rem;
  color: #38bdf8;
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.hero-description {
  font-size: 1.05rem;
  color: #cbd5e1;
  max-width: 620px;
  line-height: 1.65;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary-lg {
  background: #0284c7;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.9rem 1.85rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 20px -5px rgba(2, 132, 199, 0.4);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary-lg:hover {
  background: #0369a1;
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-secondary-lg {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 0.9rem 1.85rem;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-secondary-lg:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.hero-stats-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.hero-stat-box {
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding-bottom: 1rem;
}

.hero-stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: #38bdf8;
  font-family: var(--font-mono);
}

.hero-stat-label {
  font-size: 0.8125rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Feature Bar */
.feature-highlights {
  background: #ffffff;
  border-bottom: 1px solid var(--border-light);
  padding: 1.75rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: #e0f2fe;
  color: #0284c7;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.feature-text h4 {
  font-size: 0.9375rem;
  margin-bottom: 0.15rem;
}

.feature-text p {
  font-size: 0.8125rem;
  margin-bottom: 0;
}

/* ==========================================================================
   ARTICLE CARDS & SECTIONS
   ========================================================================== */

.section-spacing {
  padding: 4rem 0;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 1rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.section-subtitle {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-xs);
  transition: var(--transition);
  position: relative;
}

.article-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.article-meta-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.badge-category {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

.badge-issue {
  background: #f1f5f9;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

.article-title-link {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.35;
  display: block;
  margin-bottom: 0.5rem;
}

.article-title-link:hover {
  color: var(--color-accent);
}

.article-authors {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.article-abstract-excerpt {
  font-size: 0.9125rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
  padding-top: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.doi-chip {
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  color: var(--color-accent);
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.article-actions {
  display: flex;
  gap: 0.65rem;
}

.btn-sm-outline {
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  background: #ffffff;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-sm-outline:hover {
  background: var(--bg-subtle);
  color: var(--color-primary);
  border-color: var(--text-muted);
}

.btn-sm-pdf {
  background: #0284c7;
  color: #ffffff;
  border-color: #0284c7;
}

.btn-sm-pdf:hover {
  background: #0369a1;
  color: #ffffff;
}

/* ==========================================================================
   FORMS & INPUTS
   ========================================================================== */

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.form-section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

label.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

label.form-label .required {
  color: var(--color-rose);
}

.form-control, .form-select, textarea.form-control {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.form-control:focus, .form-select:focus, textarea.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.phone-input-group {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0.5rem;
}

.author-block {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  position: relative;
}

.author-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.author-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  background: #e2e8f0;
  color: var(--text-muted);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.author-badge.corresponding {
  background: #dbeafe;
  color: #1e40af;
}

.btn-remove-author {
  background: none;
  border: none;
  color: var(--color-rose);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.btn-add-author {
  background: #f8fafc;
  border: 2px dashed var(--border-subtle);
  color: var(--color-accent);
  width: 100%;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.btn-add-author:hover {
  background: #f0f9ff;
  border-color: var(--color-accent);
}

.file-dropzone {
  border: 2px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  background: #f8fafc;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.file-dropzone:hover {
  background: #f0f9ff;
  border-color: var(--color-accent);
}

.dropzone-icon {
  font-size: 2.5rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.alert-success {
  background-color: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.alert-error, .alert-danger {
  background-color: #fff1f2;
  border: 1px solid #fecdd3;
  color: #9f1239;
}

.alert-info {
  background-color: #f0f9ff;
  border: 1px solid #bae6fd;
  color: #0369a1;
}

/* ==========================================================================
   APC CALCULATOR & PRICING
   ========================================================================== */

.apc-calculator-card {
  background: linear-gradient(135deg, #0a2540 0%, #153e6b 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}

.apc-breakdown-box {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.apc-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-size: 0.9375rem;
}

.apc-row.total {
  border-bottom: none;
  font-size: 1.25rem;
  font-weight: 700;
  color: #38bdf8;
  padding-top: 0.75rem;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  background-color: var(--color-primary-dark);
  color: #94a3b8;
  padding: 4rem 0 2rem 0;
  margin-top: auto;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  color: #ffffff;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  color: #94a3b8;
  font-size: 0.875rem;
}

.footer-col h4 {
  color: #f1f5f9;
  font-size: 0.9375rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: #38bdf8;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Citation Modal */
.modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 1.5rem;
}

.modal-backdrop.active {
  display: flex;
}

.modal-content {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  padding: 2rem;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.citation-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
  }
  .nav-menu.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .phone-input-group {
    grid-template-columns: 1fr;
  }
}