/* UNZA Library - Official UNZA green + Zambian Flag accents */
:root {
  --green: #007A20;
  --green-light: #01862B;
  --green-dark: #005C18;
  --green-accent: #93B800;
  --red: #D4000D;
  --red-dark: #B31B1B;
  --black: #212121;
  --orange: #F3950C;
  --orange-light: #FFB040;
  --white: #FFFFFF;
  --gray-50: #F8FAF9;
  --gray-100: #F0F4F2;
  --gray-200: #E2E8E5;
  --gray-300: #CBD5D0;
  --gray-600: #5A6B63;
  --gray-800: #2D3B35;
  --shadow: 0 4px 20px rgba(0, 122, 32, 0.12);
  --shadow-lg: 0 8px 40px rgba(0, 122, 32, 0.18);
  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
  --font-heading: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-body: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--black);
  line-height: 1.6;
  background: var(--white);
}

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

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

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

ul {
  list-style: none;
}

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

/* Top Bar */
.top-bar {
  background: var(--black);
  color: var(--white);
  font-size: 0.85rem;
  padding: 0.5rem 0;
}

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

.top-bar a {
  color: var(--orange-light);
}

.top-bar a:hover {
  color: var(--white);
}

/* Header */
.site-header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--black);
  flex-shrink: 0;
}

.logo-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-light) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1.1rem;
  border: 3px solid var(--orange);
}

.logo-img {
  height: 58px;
  width: auto;
  display: block;
  flex-shrink: 0;
  object-fit: contain;
}

.logo-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--green-dark);
}

.logo-text span {
  font-size: 0.75rem;
  color: var(--gray-600);
  font-weight: 400;
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.6rem 0.85rem;
  color: var(--gray-800);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  background: var(--gray-100);
  color: var(--green);
}

.nav-link .chevron {
  font-size: 0.65rem;
  transition: transform var(--transition);
}

.nav-item:hover .chevron {
  transform: rotate(180deg);
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
  border-top: 3px solid var(--orange);
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown a {
  display: block;
  padding: 0.6rem 1.25rem;
  color: var(--gray-800);
  font-size: 0.875rem;
  transition: all var(--transition);
}

.dropdown a:hover {
  background: var(--gray-50);
  color: var(--green);
  padding-left: 1.5rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--green);
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  margin: 5px 0;
  transition: var(--transition);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green) 50%, var(--green-light) 100%);
  color: var(--white);
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(255, 130, 0, 0.15) 100%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green) 25%, var(--red) 25% 50%, var(--black) 50% 75%, var(--orange) 75%);
}

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

.hero-content h2 {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-content p {
  font-size: 1.15rem;
  opacity: 0.92;
  margin-bottom: 2rem;
  max-width: 520px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--orange);
  color: var(--white);
  border-color: var(--orange);
}

.btn-primary:hover {
  background: var(--orange-light);
  border-color: var(--orange-light);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
}

.btn-outline:hover {
  background: var(--white);
  color: var(--green);
}

.btn-green {
  background: var(--green);
  color: var(--white);
  border-color: var(--green);
}

.btn-green:hover {
  background: var(--green-light);
  border-color: var(--green-light);
  color: var(--white);
}

.hero-search {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

.hero-search h3 {
  color: var(--green-dark);
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.search-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.search-tab {
  padding: 0.4rem 0.85rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--gray-100);
  color: var(--gray-600);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.search-tab.active {
  background: var(--green);
  color: var(--white);
}

.search-box {
  display: flex;
  gap: 0.5rem;
}

.search-box input {
  flex: 1;
  padding: 0.85rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-box input:focus {
  border-color: var(--green);
}

.search-box button {
  padding: 0.85rem 1.5rem;
  background: var(--red);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.search-box button:hover {
  background: var(--red-dark);
}

/* Quick Links */
.quick-links {
  padding: 4rem 0;
  background: var(--gray-50);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2rem;
  color: var(--green-dark);
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

.section-header .accent-line {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--green), var(--orange));
  margin: 1rem auto 0;
  border-radius: 2px;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.quick-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border-bottom: 4px solid transparent;
}

.quick-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-bottom-color: var(--orange);
}

.quick-card .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-light) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.quick-card h3 {
  color: var(--green-dark);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.quick-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.quick-card a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* Stats */
.stats-bar {
  background: var(--green-dark);
  color: var(--white);
  padding: 3rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--orange);
  margin-bottom: 0.25rem;
}

.stat-item p {
  font-size: 0.95rem;
  opacity: 0.9;
}

/* News & Events Section */
.news-section {
  padding: 4rem 0;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.news-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.news-card-image {
  height: 180px;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.3);
}

.news-card-body {
  padding: 1.5rem;
}

.news-date {
  display: inline-block;
  background: var(--red);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.news-card-body h3 {
  color: var(--green-dark);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.news-card-body p {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Page Header (inner pages) */
.page-header {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green) 100%);
  color: var(--white);
  padding: 3rem 0;
  position: relative;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green) 25%, var(--red) 25% 50%, var(--black) 50% 75%, var(--orange) 75%);
}

.page-header h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.9rem;
  opacity: 0.85;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--orange-light);
}

.breadcrumb a:hover {
  color: var(--white);
}

.breadcrumb span {
  opacity: 0.6;
}

/* Page Content */
.page-content {
  padding: 3rem 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
}

.sidebar {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  height: fit-content;
  position: sticky;
  top: 100px;
  border-left: 4px solid var(--green);
}

.sidebar h3 {
  color: var(--green-dark);
  font-size: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--orange);
}

.sidebar ul li {
  margin-bottom: 0.25rem;
}

.sidebar ul a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--gray-800);
  font-size: 0.9rem;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.sidebar ul a:hover,
.sidebar ul a.active {
  background: var(--green);
  color: var(--white);
}

.main-content h2 {
  color: var(--green-dark);
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
}

.main-content h2:first-child {
  margin-top: 0;
}

.main-content p {
  margin-bottom: 1rem;
  color: var(--gray-800);
}

.main-content ul.content-list {
  margin: 1rem 0 1.5rem 1.5rem;
  list-style: disc;
}

.main-content ul.content-list li {
  margin-bottom: 0.5rem;
  color: var(--gray-800);
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.info-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition);
}

.info-card:hover {
  border-color: var(--green);
  box-shadow: var(--shadow);
}

.info-card h3 {
  color: var(--green-dark);
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.info-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.info-card .card-link {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 600;
  font-size: 0.9rem;
}

/* Staff Directory */
.staff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.staff-card {
  text-align: center;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  transition: all var(--transition);
}

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

.staff-avatar {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-light) 100%);
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 700;
  border: 3px solid var(--orange);
}

.staff-card h4 {
  color: var(--green-dark);
  margin-bottom: 0.25rem;
}

.staff-card .role {
  color: var(--orange);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.staff-card .dept {
  color: var(--gray-600);
  font-size: 0.85rem;
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-info-item .icon {
  width: 48px;
  height: 48px;
  background: var(--green);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.25rem;
}

.contact-info-item h4 {
  color: var(--green-dark);
  margin-bottom: 0.25rem;
}

.contact-info-item p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.contact-form {
  background: var(--gray-50);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border-top: 4px solid var(--orange);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 500;
  color: var(--gray-800);
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--green);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* Footer */
.site-footer {
  background: var(--black);
  color: var(--white);
  padding: 3rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  color: var(--orange);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.footer-col p,
.footer-col li {
  font-size: 0.9rem;
  opacity: 0.85;
  margin-bottom: 0.5rem;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.85);
}

.footer-col a:hover {
  color: var(--orange);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.7;
}

.footer-flag {
  height: 4px;
  background: linear-gradient(90deg, var(--green) 25%, var(--red) 25% 50%, var(--black) 50% 75%, var(--orange) 75%);
}

/* Alert / Notice */
.notice-banner {
  background: linear-gradient(90deg, var(--orange) 0%, var(--orange-light) 100%);
  color: var(--white);
  padding: 0.75rem 0;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
}

.notice-banner a {
  color: var(--white);
  text-decoration: underline;
}

/* Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.data-table th {
  background: var(--green);
  color: var(--white);
  padding: 0.85rem 1rem;
  text-align: left;
  font-weight: 600;
}

.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.data-table tr:hover td {
  background: var(--gray-50);
}

/* Projects */
.project-card {
  display: flex;
  gap: 1.5rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: all var(--transition);
}

.project-card:hover {
  border-color: var(--green);
  box-shadow: var(--shadow);
}

.project-status {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.project-status.active {
  background: rgba(0, 107, 63, 0.15);
  color: var(--green);
}

.project-status.completed {
  background: rgba(255, 130, 0, 0.15);
  color: var(--orange);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

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

  .sidebar {
    position: static;
  }

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

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    max-height: 80vh;
    overflow-y: auto;
  }

  .main-nav.open {
    display: flex;
  }

  .nav-item {
    width: 100%;
  }

  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    padding-left: 1rem;
    display: none;
    border-top: none;
    border-left: 2px solid var(--green);
  }

  .nav-item.open .dropdown {
    display: block;
  }

  .hero-content h2 {
    font-size: 2rem;
  }

  .page-header h1 {
    font-size: 1.75rem;
  }
}

/* Open Science page */
.open-science-page {
  padding: 3rem 0 4rem;
}

.os-hero {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green) 55%, var(--green-light) 100%);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  margin-bottom: 2.5rem;
  text-align: center;
}

.os-hero h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.os-hero p {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--orange-light);
  margin-bottom: 0.5rem;
}

.os-hero span {
  opacity: 0.9;
  font-size: 0.95rem;
}

.os-section {
  margin-bottom: 2.5rem;
}

.os-section > h2 {
  color: var(--green-dark);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.os-section > p {
  color: var(--gray-800);
  max-width: 800px;
}

.os-card-grid,
.resource-grid,
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.os-card,
.resource-card,
.tool-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: all var(--transition);
}

.os-card:hover,
.resource-card:hover,
.tool-card:hover {
  border-color: var(--green);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.os-card h3,
.resource-card h3 {
  color: var(--green-dark);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.os-card p,
.resource-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.resource-card a {
  display: inline-block;
  margin-top: 0.75rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.tool-card {
  text-align: center;
  font-weight: 700;
  color: var(--green-dark);
  padding: 1.5rem 1rem;
}

.os-cta {
  background: var(--gray-50);
  border-top: 4px solid var(--orange);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
}

.os-cta h2 {
  color: var(--green-dark);
  margin-bottom: 0.75rem;
}

.os-cta p {
  color: var(--gray-600);
  max-width: 640px;
  margin: 0 auto 1.25rem;
}

.os-cta .btn-primary {
  display: inline-flex;
  text-decoration: none;
}