@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Merriweather:ital,wght@0,300;0,400;0,700;1,400&display=swap');

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f0f6ff;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-start: #6366f1;
  --accent-end: #2563eb;
  --accent-glow: rgba(99, 102, 241, 0.18);
  --glass-bg: #ffffff;
  --glass-border: #e2e8f0;
  --danger: #ef4444;
  --success: #10b981;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-size: 0.95rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Utilities */
.text-gradient {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-panel {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.glass-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 4px;
  background: linear-gradient(to bottom, var(--accent-start), var(--accent-end));
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-panel:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.08);
  border-color: #cbd5e1;
}

.glass-panel:hover::before {
  transform: scaleY(1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 10px var(--accent-glow);
  display: inline-block;
  text-align: center;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px var(--accent-glow);
}

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

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  padding: 3px 7px;
  border-radius: 16px;
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-outline:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: #cbd5e1;
}

.btn-outline.active {
  background: var(--accent-start);
  color: #fff;
  border-color: var(--accent-start);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Form Elements */
input,
select {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent-end);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

/* Layout */
.main-layout {
  display: block;
  margin-top: 20px;
  padding-bottom: 60px;
}

/* Hero Section */
.hero-section {
  padding: 50px 0 45px;
  text-align: center;
  background: linear-gradient(135deg, #1e293b 0%, #312e81 100%);
  margin-bottom: 0;
  color: white;
}

.hero-section h2 {
  font-family: 'Merriweather', serif;
  font-size: 2.5rem;
  margin-bottom: 32px;
  color: #ffffff;
  letter-spacing: -0.5px;
}

.hero-section p {
  font-size: 1.1rem;
  color: #cbd5e1;
  max-width: 600px;
  margin: 0 auto 24px auto;
}

.hero-search-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.hero-search-label {
  font-size: 1.05rem;
  font-weight: 500;
  color: #e2e8f0;
  white-space: nowrap;
}

.hero-search-input-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
  flex: 1;
  max-width: 440px;
}

.hero-search-input-wrap input {
  flex: 1;
  margin-bottom: 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-search-status {
  text-align: center;
  font-size: 0.8rem;
  margin-top: 8px;
  min-height: 18px;
  color: var(--text-muted);
}

.hero-search-status.loading {
  color: var(--accent-start);
}

.hero-search-status.success {
  color: var(--success);
  font-weight: 500;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.hero-form-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.hero-form-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

.checkbox-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 12px;
  max-height: 90px;
  overflow-y: auto;
  padding-right: 10px;
  scrollbar-width: thin;
  scrollbar-color: var(--text-muted) transparent;
}

@media (min-width: 600px) {
  .checkbox-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

.checkbox-list::-webkit-scrollbar-thumb {
  background-color: var(--text-muted);
  border-radius: 3px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.checkbox-item input[type="checkbox"] {
  width: 14px;
  height: 14px;
  margin: 0;
  accent-color: var(--accent-end);
  cursor: pointer;
}

.checkbox-item:hover {
  color: var(--text-primary);
}

/* Filter Bar */
.filter-section {
  position: sticky;
  top: 51px;
  /* height of the navbar */
  z-index: 90;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  padding: 8px 0 8px 0;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 6px -4px rgba(0, 0, 0, 0.08);
}

.combined-filters {
  display: flex;
  align-items: center;
  gap: 12px;
}

.filter-dropdown {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.filter-dropdown-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
}

.filter-toggle {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  padding: 3px 9px;
  border-radius: 16px;
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.filter-toggle span {
  font-size: 0.6rem;
  color: var(--text-muted);
}

.filter-toggle:hover,
.filter-dropdown.open .filter-toggle {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: #cbd5e1;
}

.filter-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 8px;
  background: white;
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  padding: 12px;
  min-width: 220px;
  max-width: 320px;
  max-height: 350px;
  overflow-y: auto;
  z-index: 100;
  display: none;
  flex-wrap: wrap;
  gap: 6px;
}

.filter-dropdown.open .filter-menu {
  display: flex;
}

.filter-divider {
  display: none;
}

.filter-label {
  font-weight: 600;
  font-size: 0.68rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* Article Blurb */
.article-card {
  padding: 6px 16px;
  margin-bottom: 0;
  display: flex;
  flex-direction: row;
  gap: 0;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--glass-border);
  border-radius: 0;
  box-shadow: none;
  transition: border-left-color 0.2s ease, background 0.2s ease;
  overflow: hidden;
}

.article-card:hover {
  border-left-color: var(--accent-start);
  background: #fafaff;
}

/* Image thumbnail on the left */
.article-thumbnail {
  flex-shrink: 0;
  width: 130px;
  margin: 6px 16px 6px 0;
  border-radius: 8px;
  overflow: hidden;
  align-self: flex-start;
}

.article-thumbnail img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  display: block;
  border-radius: 8px;
}

/* Text content beside image */
.article-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 6px 0;
}


.article-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.pub-type-badge {
  font-size: 0.62rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* Color variants by type — tinted background, colored text */
.pub-type-original-research {
  color: #1d4ed8;
  background: #eff6ff;
}

.pub-type-rct {
  color: #065f46;
  background: #ecfdf5;
}

.pub-type-systematic-review,
.pub-type-meta-analysis {
  color: #5b21b6;
  background: #f5f3ff;
}

.pub-type-review {
  color: #7c3aed;
  background: #f5f3ff;
}

.pub-type-clinical-trial {
  color: #0f766e;
  background: #f0fdfa;
}

.pub-type-editorial,
.pub-type-commentary {
  color: #92400e;
  background: #fffbeb;
}

.pub-type-letter {
  color: #9d174d;
  background: #fdf2f8;
}

.pub-type-case-report {
  color: #9a3412;
  background: #fff7ed;
}

.pub-type-guideline {
  color: #155e75;
  background: #ecfeff;
}

.pub-type-observational {
  color: #334155;
  background: #f8fafc;
}

.article-journal {
  color: var(--accent-start);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.article-title {
  font-family: 'Merriweather', serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.35;
}

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

.article-abstract {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 0.9rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.article-authors {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0;
}

/* Navbar */
.navbar {
  padding: 10px 0;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.4rem;
  letter-spacing: -0.5px;
}

.submit-message {
  margin-top: 12px;
  padding: 10px;
  border-radius: 8px;
  font-size: 0.85rem;
  text-align: center;
}

.submit-message.success {
  background: #ecfdf5;
  color: var(--success);
  border: 1px solid #d1fae5;
}

.submit-message.error {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fee2e2;
}

/* Hide visually but keep in DOM */
.hidden-article {
  display: none !important;
}

/* Modal Styling */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: #fff;
  width: 90%;
  max-width: 600px;
  padding: 32px;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.article-tags-display {
  display: flex;
  flex-wrap: nowrap;
  overflow: hidden;
  gap: 5px;
  margin-top: 4px;
}

.article-tag {
  font-size: 0.62rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  color: #64748b;
}