/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  --color-primary: #4A9B8E;
  --color-primary-light: #7BC4B8;
  --color-primary-dark: #2E7B6E;
  --color-text: #2C3E50;
  --color-text-light: #5A6C7D;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8F9FA;
  --color-border: #E0E0E0;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --spacing-xxl: 6rem;
  
  --border-radius: 12px;
  --border-radius-lg: 20px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --transition: all 0.3s ease;
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

address {
  font-style: normal;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

h4 {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
}

p {
  margin-bottom: var(--spacing-sm);
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

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

.small {
  font-size: 0.875rem;
}

strong {
  font-weight: 600;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.content-block {
  margin: var(--spacing-lg) 0 0;
}

/* ============================================
   GRID UTILITIES
   ============================================ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  min-width: 160px;
}

.btn:focus {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

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

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  height: 100%;
}

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

.card-icon {
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar {
  padding: 1rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-link {
  display: flex;
  align-items: center;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo-text sup {
  font-size: 0.6em;
  font-weight: 600;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
  padding: 0.5rem 0;
  transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--color-primary);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
  padding: 0.5rem;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--color-text);
  transition: all 0.3s ease;
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: white;
    width: 100%;
    text-align: center;
    transition: left 0.3s ease;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: 2rem 0;
    gap: 0;
  }
  
  .nav-links li {
    width: 100%;
    padding: 1rem 0;
  }

  .nav-links.active {
    left: 0;
  }

  .hamburger {
    display: flex;
  }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  background: linear-gradient(135deg, #b8fbf0 0%, #FFD966 100%);
  padding: 4rem 2rem;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3rem);
  margin-bottom: 1.5rem;
  line-height: 1.2;
  color: var(--color-text);
}

.hero-description {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  line-height: 1.6;
  margin-bottom: 2rem;
  color: var(--color-text);
}

.hero-tagline {
  background: #C8E6A0;
  display: inline-block;
  padding: 1rem 2rem;
  border-radius: 30px;
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1rem;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .hero {
    padding: 3rem 1.5rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-description {
    font-size: 1.1rem;
  }
  
  .hero-tagline {
    font-size: 1rem;
    padding: 0.875rem 1.5rem;
  }
}

/* ============================================
   PROGRAMS
   ============================================ */
.programs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

@media (max-width: 900px) {
  .programs {
    grid-template-columns: 1fr;
  }
}

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

.program-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}

.program-header {
  padding: var(--spacing-md);
  border-bottom: 3px solid rgba(0, 0, 0, 0.05);
}

.program-header h3 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.35rem;
}

.program-tagline {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.program-content {
  padding: var(--spacing-md);
}

.program-content ul {
  list-style: none;
  padding: 0;
}

.program-content li {
  padding: var(--spacing-xs) 0;
  position: relative;
  padding-left: 1.5rem;
}

.program-content li::before {
  content: '●';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.8rem;
}

/* ============================================
   IMPACT STATS
   ============================================ */
.impact-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.stat-item {
  background: white;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-heading);
}

.stat-label {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

/* ============================================
   PARTICIPATION
   ============================================ */
.participation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.participation-block {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.participation-block h3 {
  margin-bottom: var(--spacing-sm);
}

.participation-block p {
  margin-bottom: var(--spacing-md);
}

.qr-code {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.qr-code img {
  max-width: 200px;
  margin: 0 auto var(--spacing-xs);
}

/* ============================================
   PARTNER GRID
   ============================================ */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.partner-logo {
  background: white;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.partner-logo:hover {
  box-shadow: var(--shadow-md);
  transform: scale(1.05);
}

.partner-logo img {
  max-height: 80px;
  width: auto;
  opacity: 0.8;
  transition: var(--transition);
}

.partner-logo:hover img {
  opacity: 1;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.contact-item h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

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

.contact-list li {
  margin-bottom: var(--spacing-xs);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--color-text);
  color: white;
  padding: var(--spacing-md) 0;
  text-align: center;
  margin-top: var(--spacing-xxl);
}

.footer p {
  margin: 0;
  font-size: 0.95rem;
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background-color: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover,
.back-to-top:focus {
  background-color: var(--color-primary-dark);
  transform: translateY(-4px);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  :root {
    --spacing-xxl: 3rem;
    --spacing-xl: 2.5rem;
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .programs {
    grid-template-columns: 1fr;
  }
  
  .impact-stats {
    grid-template-columns: 1fr;
  }
  
  .participation-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .partner-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .btn {
    width: 100%;
    padding: 0.75rem 1.5rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
}