/* ==================== */
/* 1. CSS Custom Properties */
/* ==================== */

:root {
  /* Color Palette - Light Mode */
  --color-accent: #e63946;
  --color-accent-hover: #d62828;
  --color-accent-light: #fef2f2;

  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #f1f3f5;
  --color-border: #e9ecef;

  --color-text-primary: #212529;
  --color-text-secondary: #495057;
  --color-text-muted: #6c757d;
  --color-text-light: #adb5bd;

  --color-link: #e63946;
  --color-link-hover: #d62828;
  --color-success: #52b788;
  --color-info: #4895ef;

  /* Spacing Scale (8px grid) */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.875rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-navbar: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-navbar-scrolled: 0 4px 16px rgba(0, 0, 0, 0.08);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 24px;
}

[data-theme="dark"] {
  /* Color Palette - Dark Mode */
  --color-accent: #ff6b6b;
  --color-accent-hover: #ff8787;
  --color-accent-light: #2d1518;

  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #242424;
  --color-bg-tertiary: #2d2d2d;
  --color-border: #3d3d3d;

  --color-text-primary: #f8f9fa;
  --color-text-secondary: #e9ecef;
  --color-text-muted: #adb5bd;
  --color-text-light: #6c757d;

  --color-link: #ff6b6b;
  --color-link-hover: #ff8787;
  --color-success: #6fdc8c;
  --color-info: #5ba3ff;

  /* Shadows - Darker/stronger for dark mode */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-navbar: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-navbar-scrolled: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ==================== */
/* 2. Base Styles */
/* ==================== */

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
  min-height: 75rem;
  padding-top: 5.5rem;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  transition: color 0.3s ease;
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-3xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

h6 {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.active {
  color: var(--color-accent) !important;
}

/* ==================== */
/* 3. Component Styles */
/* ==================== */

/* Floating Navbar with Glassmorphism */
/* Adjusted margin-top to account for the new top bar */
.navbar-custom {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-navbar);
  border-radius: var(--radius-md);
  margin: 40px 24px 0 24px;
  padding: 12px 24px !important;
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
  z-index: 1034;
}

[data-theme="dark"] .navbar-custom {
  background: rgba(26, 26, 26, 0.85) !important;
}

.navbar-custom.scrolled {
  box-shadow: var(--shadow-navbar-scrolled);
}

.navbar-custom .navbar-brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary) !important;
}

.navbar-custom .nav-link {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  transition: color 0.15s ease;
  margin: 0 var(--space-xs);
}

.navbar-custom .nav-link:hover,
.navbar-custom .nav-link:focus {
  color: var(--color-accent) !important;
}

.navbar-custom .navbar-toggler {
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.navbar-custom .navbar-toggler-icon {
  filter: brightness(0) saturate(100%) invert(0);
}

[data-theme="dark"] .navbar-custom .navbar-toggler-icon {
  filter: brightness(0) saturate(100%) invert(1);
}

/* Secondary Slim Bar */
.secondary-nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1035;
  padding: 4px 24px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  transition: all 0.3s ease;
}

[data-theme="dark"] .secondary-nav-bar {
  background: rgba(26, 26, 26, 0.7);
}

@media (max-width: 768px) {
  .secondary-nav-bar {
    padding: 2px 16px;
    font-size: 0.7rem;
  }
}

.secondary-nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.secondary-nav-links a:hover {
  color: var(--color-accent);
}

/* Dark Mode Toggle Button */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-left: var(--space-xs);
  padding: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-secondary);
  border-color: var(--color-accent);
  transform: none;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: var(--color-text-primary);
  transition: fill 0.2s ease;
}

.sun-icon {
  display: none;
}

.moon-icon {
  display: block;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

[data-theme="dark"] .moon-icon {
  display: none;
}

/* Article Cards */
.article-card {
  background: var(--color-bg-primary);
  border: none !important;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.article-card__badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.article-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
  margin-top: var(--space-xs);
}

.article-card__authors {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.article-card__actions {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.article-card__abstract {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-sm);
}

/* Override Bootstrap card styles */
.card {
  background: var(--color-bg-primary) !important;
  border: none !important;
  border-radius: var(--radius-md) !important;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.card-body {
  color: var(--color-text-secondary);
}

.card-title {
  color: var(--color-text-primary);
}

/* Buttons */
.btn {
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-pill);
  padding: var(--space-xs) 20px;
  font-size: var(--font-size-sm);
  transition: all 0.15s ease;
  border: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-accent) !important;
  color: white !important;
  border: none !important;
}

.btn-primary:hover {
  background: var(--color-accent-hover) !important;
  box-shadow: 0 2px 8px rgba(230, 57, 70, 0.25);
}

.btn-secondary,
.btn-light {
  background: var(--color-bg-secondary) !important;
  color: var(--color-text-primary) !important;
  border: 1px solid var(--color-border) !important;
}

.btn-secondary:hover,
.btn-light:hover {
  background: var(--color-bg-tertiary) !important;
  border-color: var(--color-accent) !important;
}

.btn-dark {
  background: var(--color-text-primary) !important;
  color: var(--color-bg-primary) !important;
}

.btn-dark:hover {
  background: var(--color-text-secondary) !important;
}

.btn-sm {
  padding: 6px 16px;
  font-size: var(--font-size-xs);
}

/* Modals */
.modal-backdrop {
  backdrop-filter: blur(4px);
}

.modal-content {
  background: var(--color-bg-primary);
  border: none !important;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  transition: background-color 0.3s ease;
}

.modal-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-title {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
}

.modal-body {
  padding: var(--space-lg);
  color: var(--color-text-secondary);
}

.modal-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
}

.btn-close {
  filter: brightness(0) saturate(100%);
}

[data-theme="dark"] .btn-close {
  filter: brightness(0) saturate(100%) invert(1);
}

/* Dropdowns */
.dropdown-menu {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-xs);
  transition: background-color 0.3s ease;
}

.dropdown-item {
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) 16px;
  transition: all 0.15s ease;
}

.dropdown-item:hover,
.dropdown-item:focus {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
}

/* List Groups */
.list-group-item {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all 0.15s ease;
}

.list-group-item:hover {
  background: var(--color-bg-secondary);
}

.journal-list-scrollable {
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: var(--space-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--color-text-muted) transparent;
}

.journal-list-scrollable::-webkit-scrollbar {
  width: 6px;
}

.journal-list-scrollable::-webkit-scrollbar-thumb {
  background-color: var(--color-border);
  border-radius: 20px;
}


/* Tables */
.table {
  color: var(--color-text-secondary);
}

.table thead th {
  color: var(--color-text-primary);
  border-bottom: 2px solid var(--color-border);
  font-weight: var(--font-weight-semibold);
}

.table tbody td {
  border-bottom: 1px solid var(--color-border);
}

/* Forms */
.form-control,
.form-select {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.form-control:focus,
.form-select:focus {
  background: var(--color-bg-primary);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
  color: var(--color-text-primary);
}

/* Form Switches - Accent Color */
.form-check-input:checked {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.form-check-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 0.25rem rgba(230, 57, 70, 0.25);
}

[data-theme="dark"] .form-check-input:focus {
  box-shadow: 0 0 0 0.25rem rgba(255, 107, 107, 0.25);
}

/* Hero Section */
.hero {
  padding: var(--space-3xl) var(--space-md);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  border-radius: var(--radius-lg);
  text-align: center;
  margin-bottom: var(--space-xl);
}

/* ==================== */
/* 4. Layout & Utilities */
/* ==================== */

.container {
  max-width: 1280px;
}

.bg-accent {
  background-color: var(--color-accent) !important;
}

.text-accent {
  color: var(--color-accent) !important;
}

.text-muted {
  color: var(--color-text-muted) !important;
}

.bg-light {
  background-color: var(--color-bg-secondary) !important;
}

/* Reusable Hover Effects */
.hover-lift {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ==================== */
/* 5. Transitions */
/* ==================== */

/* Collapse transitions - Bootstrap handles this */
.collapse {
  transition: height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== */
/* 6. Accessibility */
/* ==================== */

*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ==================== */
/* 7. Reduced Motion */
/* ==================== */

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==================== */
/* 8. Responsive */
/* ==================== */

@media (max-width: 768px) {
  body {
    padding-top: 4.5rem;
  }

  .navbar-custom {
    margin: 32px 16px 0 16px;
    padding: 8px 16px !important;
  }

  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

  .hero {
    padding: var(--space-xl) var(--space-md);
  }
}

/* ==================== */
/* 9. Settings View */
/* ==================== */

/* Settings Items - Base */
.settings-item {
  display: flex;
  align-items: center;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-secondary);
  box-shadow: var(--shadow-sm);
}

/* Journal & Subject Settings View */
.journal-setting-item,
.subject-setting-item {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border: none !important;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  padding: var(--space-xs);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-secondary);
}

.journal-setting-item:hover,
.subject-setting-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.journal-setting-item .form-switch .form-check-input {
  cursor: pointer;
}

.journal-setting-item .btn-group {
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.journal-setting-item:hover .btn-group {
  opacity: 1;
}

/* Drag & Drop Styles (SortableJS) */
.sortable-ghost {
  opacity: 0.4;
}

.draggable-item {
  cursor: move;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.draggable-item.sortable-chosen {
  opacity: 0.9;
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.drag-handle {
  cursor: grab;
}

.drag-handle:active {
  cursor: grabbing !important;
}

/* ==================== */
/* 10. Preprints Styles */
/* ==================== */

.article-card__subjects {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.subject-tag {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: all 0.15s ease;
}

.subject-tag:hover {
  background-color: var(--color-bg-tertiary);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

[data-theme="dark"] .journal-setting-item,
[data-theme="dark"] .subject-setting-item {
  background-color: var(--color-bg-secondary) !important;
}

[data-theme="dark"] .subject-tag {
  background-color: var(--color-bg-tertiary);
}

/* ==================== */
/* 12. Filter Banner */
/* ==================== */

.filter-banner {
  position: fixed;
  top: 108px;
  left: 0;
  right: 0;
  z-index: 1033;
  background: rgba(255, 243, 205, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 193, 7, 0.3);
  padding: 4px 24px;
  font-size: var(--font-size-xs);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

[data-theme="dark"] .filter-banner {
  background: rgba(102, 77, 3, 0.95);
  border-bottom-color: rgba(255, 193, 7, 0.2);
}

.filter-banner-text {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}

.filter-banner-icon {
  margin-right: var(--space-xs);
  opacity: 0.8;
}

.filter-banner-link {
  color: var(--color-accent);
  text-decoration: underline;
  font-weight: var(--font-weight-medium);
  transition: color 0.15s ease;
}

.filter-banner-link:hover {
  color: var(--color-accent-hover);
}

.filter-banner-dismiss {
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-size: 18px;
  line-height: 1;
  padding: 0;
  margin-left: var(--space-xs);
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.15s ease;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.filter-banner-dismiss:hover {
  opacity: 1;
}

@media (max-width: 768px) {
  .filter-banner {
    top: 96px;
    padding: 3px 16px;
    font-size: 0.7rem;
  }

  .filter-banner .d-flex {
    flex-wrap: wrap;
    gap: 4px;
  }
}