/* ==============================================================================
   HIMS DIGITAL MEDICAL LIBRARY
   Subdomain: library.himspeshawar.edu.pk
   Hayatabad Institute of Medical Sciences Peshawar
   Stylesheet: css/style.css
   ============================================================================== */

:root {
  --primary: #087443;
  --primary-hover: #0aa05d;
  --primary-dark: #055431;
  --primary-light: #eaf6ef;
  --primary-light-border: #b9d8c7;
  
  --navy-900: #0F1A33;
  --navy-800: #16234A;
  --navy-700: #203366;
  
  --ink: #1e293b;
  --ink-soft: #64748b;
  --ink-muted: #94a3b8;
  
  --bg-page: #f8faf9;
  --bg-card: #ffffff;
  --line: #e2e8f0;
  --line-light: #edf2f7;
  
  --accent-gold: #d97706;
  --accent-blue: #0284c7;
  --accent-red: #dc2626;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 14px rgba(8,116,67,0.08);
  --shadow-lg: 0 10px 28px rgba(8,116,67,0.12);
  --shadow-hover: 0 12px 30px rgba(8,116,67,0.18);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ---------------- Layout Containers ---------------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.container-narrow {
  max-width: 900px;
}

.section {
  padding: 60px 0;
}

.section-tight {
  padding: 35px 0;
}

.section-head {
  text-align: center;
  margin-bottom: 40px;
}

.section-kicker {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid var(--primary-light-border);
}

.section-title {
  color: var(--primary);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 720px;
  margin: 0 auto;
}

/* ---------------- Top Banner Bar ---------------- */
.topbar {
  background: var(--primary-dark);
  color: #ffffff;
  padding: 9px 0;
  font-size: 13px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.topbar-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.topbar a {
  color: #ffffff;
  opacity: 0.92;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.topbar a:hover {
  opacity: 1;
  text-decoration: underline;
}

.topbar-badge {
  background: rgba(255,255,255,0.18);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11.5px;
  font-weight: 600;
}

/* ---------------- Header & Branding ---------------- */
.header {
  background: #ffffff;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.header-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
}

.brand-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 50%;
  border: 2px solid var(--primary-light-border);
  padding: 2px;
  background: #ffffff;
}

.brand-info h1 {
  color: var(--primary);
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 800;
  line-height: 1.2;
  margin: 0;
}

.brand-info p {
  color: var(--ink-soft);
  font-size: 13.5px;
  font-weight: 500;
  margin-top: 3px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.subdomain-tag {
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  color: var(--primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
  font-family: Consolas, monospace;
}

.portal-link-btn {
  background: var(--navy-900);
  color: #ffffff !important;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.2s;
}

.portal-link-btn:hover {
  background: var(--navy-800);
  color: #ffffff;
}

/* ---------------- Navigation ---------------- */
.nav-bar {
  background: var(--primary);
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 4px 12px rgba(8,116,67,0.15);
}

.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links li a {
  display: block;
  color: #ffffff;
  padding: 14px 18px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s;
}

.nav-links li a:hover,
.nav-links li a.active {
  background: var(--primary-hover);
  color: #ffffff;
}

.nav-search-btn {
  background: #ffffff;
  color: var(--primary) !important;
  font-size: 13px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 8px 0;
}

.nav-search-btn:hover {
  background: var(--primary-light);
}

/* Mobile Toggle */
.mobile-toggle-btn {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 24px;
  cursor: pointer;
  padding: 10px;
}

/* ---------------- Hero Section ---------------- */
.hero {
  background: linear-gradient(135deg, #065430 0%, #087443 60%, #0ca868 100%);
  color: #ffffff;
  padding: 55px 0 65px;
  position: relative;
  overflow: hidden;
}

.hero-banner-card {
  max-width: 940px;
  margin: 0 auto 30px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  border: 3px solid rgba(255,255,255,0.2);
}

.hero-banner-img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
}

.hero-content {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 14px;
  color: #ffffff;
}

.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.6;
  opacity: 0.95;
  margin-bottom: 30px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------------- Search Engine Box ---------------- */
.search-container {
  max-width: 800px;
  margin: 0 auto;
}

.search-bar {
  display: flex;
  background: #ffffff;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px rgba(0,0,0,0.22);
  padding: 6px;
  gap: 8px;
  border: 2px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-bar:focus-within {
  border-color: var(--primary-light);
  box-shadow: 0 10px 35px rgba(0,0,0,0.3);
}

.search-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 12px;
}

.search-icon {
  font-size: 20px;
  color: var(--primary);
}

.search-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 16px;
  color: var(--ink);
  background: transparent;
}

.search-input::placeholder {
  color: var(--ink-muted);
}

.search-btn {
  background: var(--primary);
  color: #ffffff !important;
  border: none;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.search-btn:hover {
  background: var(--primary-hover);
}

.search-quick-tags {
  margin-top: 14px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
  opacity: 0.92;
}

.quick-tag {
  background: rgba(255,255,255,0.2);
  color: #ffffff !important;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.quick-tag:hover {
  background: rgba(255,255,255,0.35);
}

/* ---------------- Dynamic Search Results Area ---------------- */
.search-results-section {
  background: #ffffff;
  border-bottom: 2px solid var(--primary-light-border);
  padding: 40px 0;
}

.search-results-section[hidden] {
  display: none !important;
}

.search-results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.search-results-header h2 {
  font-size: 22px;
  color: var(--primary);
}

.clear-search-btn {
  background: var(--primary-light);
  color: var(--primary) !important;
  border: 1px solid var(--primary-light-border);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.clear-search-btn:hover {
  background: var(--primary);
  color: #ffffff !important;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* ---------------- Book Cards ---------------- */
.book-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.book-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light-border);
}

.book-icon-badge {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 14px;
  border: 1px solid var(--primary-light-border);
}

.book-category-tag {
  font-size: 11.5px;
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
  display: block;
}

.book-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--navy-900);
  line-height: 1.4;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 65px;
}

.book-meta {
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.book-read-btn {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: #ffffff !important;
  font-size: 13px;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  text-align: center;
  transition: background 0.2s, transform 0.15s;
}

.book-read-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

/* ---------------- Principal Message Card ---------------- */
.principal-section {
  background: #ffffff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 50px 0;
}

.principal-card {
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  align-items: center;
  gap: 36px;
  box-shadow: var(--shadow-sm);
}

.principal-avatar-wrap {
  flex-shrink: 0;
  text-align: center;
}

.principal-avatar {
  width: 170px;
  height: 170px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary);
  box-shadow: 0 6px 18px rgba(8,116,67,0.2);
}

.principal-role {
  margin-top: 10px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 700;
}

.principal-text h2 {
  font-size: 26px;
  color: var(--primary);
  font-weight: 800;
  margin-bottom: 6px;
}

.principal-text .lead-role {
  color: var(--ink-soft);
  font-size: 14.5px;
  font-weight: 600;
  margin-bottom: 16px;
}

.principal-quote {
  font-family: var(--font-serif);
  font-size: 17px;
  font-style: italic;
  color: var(--navy-900);
  line-height: 1.65;
  margin-bottom: 18px;
  position: relative;
  padding-left: 18px;
  border-left: 3px solid var(--primary);
}

/* ---------------- Categories Grid ---------------- */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.category-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  transition: all 0.25s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.category-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.category-icon {
  font-size: 42px;
  margin-bottom: 14px;
}

.category-card h3 {
  font-size: 18px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 8px;
}

.category-card p {
  color: var(--ink-soft);
  font-size: 13.5px;
  margin-bottom: 12px;
}

.category-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* ---------------- Online Databases Section ---------------- */
.database-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.database-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  transition: all 0.25s;
  display: flex;
  flex-direction: column;
  position: relative;
}

.database-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.database-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.database-icon {
  font-size: 32px;
}

.database-card h3 {
  font-size: 18px;
  color: var(--navy-900);
  font-weight: 700;
}

.database-card p {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.55;
  margin-bottom: 18px;
  flex: 1;
}

.database-link {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ---------------- Stats Banner ---------------- */
.stats-banner {
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--primary-dark) 100%);
  color: #ffffff;
  padding: 50px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item h2 {
  font-size: clamp(32px, 4vw, 46px);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.stat-item p {
  font-size: 15px;
  opacity: 0.9;
  letter-spacing: 0.02em;
  font-weight: 500;
}

/* ---------------- Subject Directory Pill Grid ---------------- */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.subject-pill {
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--primary);
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.subject-pill:hover {
  background: var(--primary);
  color: #ffffff !important;
  transform: translateX(4px);
  border-color: var(--primary);
}

/* ---------------- Catalog Page Specific ---------------- */
.catalog-toolbar {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

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

.filter-select {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--ink);
  font-size: 13.5px;
  outline: none;
  cursor: pointer;
}

.filter-select:focus {
  border-color: var(--primary);
}

.catalog-pagination {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-btn {
  background: #ffffff;
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover,
.page-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.page-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---------------- Article / Resources Cards ---------------- */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s, box-shadow 0.25s;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.article-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.article-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-date {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.article-title {
  font-size: 18px;
  color: var(--navy-900);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 12px;
}

.article-excerpt {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.55;
  margin-bottom: 18px;
  flex: 1;
}

/* ---------------- Info Cards & Details ---------------- */
.info-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 24px;
}

.info-card h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.info-card p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.65;
  margin-bottom: 14px;
}

.info-list {
  list-style: none;
}

.info-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--line-light);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
}

.info-list li:last-child {
  border-bottom: none;
}

/* ---------------- Modal ---------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 26, 51, 0.65);
  backdrop-filter: blur(4px);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 45px rgba(0,0,0,0.3);
  padding: 30px;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.25s;
}

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

.modal-close-btn {
  position: absolute;
  top: 18px;
  right: 18px;
  background: var(--bg-page);
  border: none;
  font-size: 18px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------------- Footer ---------------- */
.footer {
  background: var(--navy-900);
  color: #ffffff;
  padding: 60px 0 25px;
  border-top: 4px solid var(--primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
  margin-bottom: 45px;
}

.footer-col h3 {
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--primary);
}

.footer-col p {
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 14px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--ink-muted);
  font-size: 14px;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-links a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  color: var(--ink-muted);
}

/* ---------------- Responsive Media Queries ---------------- */
@media (max-width: 1024px) {
  .results-grid,
  .categories-grid,
  .subjects-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .database-grid,
  .resources-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .results-grid,
  .categories-grid,
  .subjects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .database-grid,
  .resources-grid {
    grid-template-columns: 1fr;
  }

  .principal-card {
    flex-direction: column;
    text-align: center;
    padding: 24px;
  }

  .principal-quote {
    padding-left: 0;
    border-left: none;
  }

  .mobile-toggle-btn {
    display: block;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    border-top: 1px solid rgba(255,255,255,0.15);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li a {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .search-bar {
    flex-direction: column;
  }

  .search-btn {
    width: 100%;
  }

  .header-wrap {
    flex-direction: column;
    text-align: center;
  }

  .brand-group {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .results-grid,
  .categories-grid,
  .subjects-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}