/* ==========================================
   Alumni Website - Modern & Elegant Design
   Colors: #16672F (Primary), #82BA31 (Secondary)
   ========================================== */

:root {
  --primary: #16672F;
  --primary-dark: #0f4d23;
  --primary-light: #1e7d39;
  --secondary: #82BA31;
  --secondary-light: #9dce4a;
  --secondary-dark: #6d9e29;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

/* ==========================================
   Base Styles
   ========================================== */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--gray-800);
  background-color: var(--white);
  scroll-behavior: smooth;
}

/* ==========================================
   Navigation
   ========================================== */
.nav-link {
  position: relative;
  color: var(--gray-700);
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-link.active::after {
  width: 100%;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, #0a3818 100%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
}

/* ==========================================
   Cards
   ========================================== */
.card {
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  transition: all 0.3s ease;
  border: 1px solid var(--gray-100);
}

.card:hover {
  box-shadow: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}

/* ==========================================
   Buttons
   ========================================== */
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  box-shadow: 0 4px 12px rgba(22, 103, 47, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary) 100%);
  box-shadow: 0 4px 12px rgba(130, 186, 49, 0.4);
  transform: translateY(-1px);
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-1px);
}

.btn-white {
  background: white;
  color: var(--primary);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-white:hover {
  background: var(--gray-50);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transform: translateY(-1px);
}

/* ==========================================
   Section Titles
   ========================================== */
.section-title {
  position: relative;
  color: var(--gray-900);
  font-weight: 700;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

.section-title-left::after {
  left: 0;
  transform: none;
}

/* ==========================================
   Gradient Backgrounds
   ========================================== */
.gradient-green {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

.gradient-green-light {
  background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%);
}

.gradient-section {
  background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
}

/* ==========================================
   Stat Cards
   ========================================== */
.stat-card {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  transition: all 0.3s ease;
  border: 1px solid var(--gray-100);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(22, 103, 47, 0.1);
}

.stat-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

/* ==========================================
   Timeline
   ========================================== */
.timeline-item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: -5px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 0 0 2px var(--primary);
}

/* ==========================================
   Form Elements
   ========================================== */
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22, 103, 47, 0.1);
}

.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  background: white;
  transition: all 0.3s ease;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1.25rem;
  padding-right: 2.5rem;
}

.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22, 103, 47, 0.1);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #0a3818 100%);
  color: white;
}

.footer a {
  color: rgba(255,255,255,0.8);
  transition: color 0.3s ease;
}

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

/* ==========================================
   Gallery Grid
   ========================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  aspect-ratio: 4/3;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  padding: 1.5rem;
  color: white;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-overlay {
  transform: translateY(0);
}

/* ==========================================
   Testimonial Card
   ========================================== */
.testimonial-card {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  position: relative;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  border: 1px solid var(--gray-100);
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: 20px;
  font-size: 5rem;
  color: var(--primary);
  opacity: 0.1;
  line-height: 1;
}

/* ==========================================
   Progress Bar
   ========================================== */
.progress-bar {
  height: 10px;
  background: var(--gray-200);
  border-radius: 5px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 5px;
  transition: width 1s ease;
}

/* ==========================================
   Page Header
   ========================================== */
.page-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 6rem 0 3rem;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

/* ==========================================
   Badge / Tag
   ========================================== */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.tag-green {
  background: #e8f5e9;
  color: var(--primary);
}

.tag-light {
  background: rgba(130, 186, 49, 0.1);
  color: var(--secondary-dark);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }

/* ==========================================
   Scrollbar
   ========================================== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* ==========================================
   Mobile Menu
   ========================================== */
.mobile-menu {
  transition: all 0.3s ease;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu.closed {
  opacity: 0;
  visibility: hidden;
  max-height: 0;
}

/* ==========================================
   Donation Cards
   ========================================== */
.donation-card {
  position: relative;
  overflow: hidden;
}

.donation-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

/* ==========================================
   Alert Messages
   ========================================== */
.alert-success {
  background: #e8f5e9;
  border: 1px solid #a5d6a7;
  color: #1b5e20;
  border-radius: 8px;
  padding: 1rem;
}

.alert-error {
  background: #fbe9e7;
  border: 1px solid #ef9a9a;
  color: #b71c1c;
  border-radius: 8px;
  padding: 1rem;
}

/* ==========================================
   Empty State
   ========================================== */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--gray-400);
}

/* ==========================================
   Loading Spinner
   ========================================== */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ==========================================
   Image Placeholder
   ========================================== */
.img-placeholder {
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 2rem;
}