/* Yeşil Kilometreler - Modern Teen Design */

/* Import Modern Fonts with Turkish Support */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Poppins:wght@400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* Modern Color Palette - Vibrant but Sophisticated */
  --color-primary: #0D9488;
  /* Darkened from #10B981 for WCAG AA compliance (4.5:1 on white) */
  --color-primary-dark: #0F766E;
  --color-primary-light: #2DD4BF;
  --color-secondary: #3B82F6;
  --color-secondary-dark: #2563EB;
  --color-accent: #F59E0B;
  --color-accent-pink: #EC4899;
  --color-purple: #8B5CF6;

  /* Neutral Colors */
  --color-bg: #F0FDF4;
  /* Lighter Mint Green */
  --color-white: #FFFFFF;
  --color-text-dark: #064E3B;
  /* Deep Forest Green */
  --color-text: #115E59;
  --color-text-light: #0D9488;
  --color-border: #CCFBF1;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 40%);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

body::after {
  content: '';
  position: fixed;
  top: -10%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: var(--color-primary-light);
  filter: blur(100px);
  opacity: 0.1;
  z-index: -1;
  border-radius: 50%;
  pointer-events: none;
}

body::before {
  content: '';
  position: fixed;
  bottom: -10%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: var(--color-secondary);
  filter: blur(120px);
  opacity: 0.1;
  z-index: -1;
  border-radius: 50%;
  pointer-events: none;
}

/* Accessibility: Clear Focus Styles */
:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

/* Screen Reader Only Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Navbar */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--color-border);
}

.navbar-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.navbar-logo {
  font-size: 1.5rem;
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: transform 0.2s;
}

.navbar-logo:hover {
  transform: translateY(-2px);
}

.navbar-logo img {
  height: 44px;
  max-width: 220px;
  width: auto;
  object-fit: contain;
  border-radius: 0;
}

.navbar-logo span {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-school-name {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #6B21A8, #9333EA) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  opacity: 0.85;
}

.logo-project-name {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-project-name span {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.navbar-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--color-text-dark);
  margin: 5px 0;
  transition: 0.3s;
  border-radius: 2px;
}

.navbar-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.navbar-menu a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.2s;
  position: relative;
}

.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transition: width 0.3s;
}

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

.navbar-menu a:hover::after {
  width: 100%;
}

/* Mobile Menu */
@media (max-width: 768px) {
  .navbar-toggle {
    display: block;
  }

  .navbar-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 1rem;
    padding-top: 1rem;
  }

  .navbar-menu.active {
    display: flex;
  }
}

/* Hero Section - Compact */
.hero {
  max-width: 1280px;
  margin: 2rem auto;
  padding: 4rem 1.5rem;
  text-align: center;
  background: white;
  border-radius: 2rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent), var(--color-accent-pink));
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text);
  max-width: 700px;
  margin: 0 auto 1.5rem;
  font-weight: 500;
  line-height: 1.7;
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-top: 1rem;
}

.tree-icon,
.cloud-icon,
.sun-icon {
  font-size: 2.5rem;
  filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.1));
  transition: transform 0.3s;
}

.tree-icon:hover,
.cloud-icon:hover,
.sun-icon:hover {
  transform: scale(1.2);
}

/* Main Content - Two Column Layout */
.main-content {
  max-width: 1280px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 968px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

/* Calculator Section */
.calculator-section {
  position: sticky;
  top: 100px;
}

.calculator-card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-radius: 2rem;
  padding: 2.5rem;
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.calculator-card h2 {
  font-size: 1.75rem;
  font-weight: 800;
  font-family: 'Poppins', sans-serif;
  margin-bottom: 2rem;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-select,
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: 0.75rem;
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  transition: all 0.2s;
  background: white;
}

.form-select:focus,
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.btn-primary {
  width: 100%;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
}

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

.btn-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: white;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* Result Section */
.result-section {
  margin-top: 1.5rem;
  padding: 2rem;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
  border-radius: 1rem;
  border: 2px solid var(--color-primary);
  display: none;
}

.result-section.active {
  display: block;
  animation: fadeIn 0.4s ease-in;
}

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

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

.result-number {
  font-size: 3rem;
  font-weight: 900;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin: 1rem 0;
}

.result-text {
  text-align: center;
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.result-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-align: center;
  font-style: italic;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

/* Tree Visualization */
.tree-visualization {
  margin-top: 1.5rem;
  padding: 2rem;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
  border-radius: 1rem;
  border: 2px dashed var(--color-primary);
  display: none;
}

.tree-visualization.active {
  display: block;
  animation: fadeIn 0.4s ease-in;
}

.tree-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
  gap: 1rem;
  max-width: 100%;
  margin: 0 auto;
  padding: 1rem;
}

.tree-item {
  font-size: 3rem;
  text-align: center;
  animation: growTree 0.5s ease-out;
  animation-fill-mode: both;
  cursor: pointer;
  transition: transform 0.2s;
}

.tree-item:hover {
  transform: scale(1.2);
}

.tree-item:nth-child(1) {
  animation-delay: 0.05s;
}

.tree-item:nth-child(2) {
  animation-delay: 0.1s;
}

.tree-item:nth-child(3) {
  animation-delay: 0.15s;
}

.tree-item:nth-child(4) {
  animation-delay: 0.2s;
}

.tree-item:nth-child(5) {
  animation-delay: 0.25s;
}

.tree-item:nth-child(6) {
  animation-delay: 0.3s;
}

.tree-item:nth-child(7) {
  animation-delay: 0.35s;
}

.tree-item:nth-child(8) {
  animation-delay: 0.4s;
}

.tree-item:nth-child(9) {
  animation-delay: 0.45s;
}

.tree-item:nth-child(10) {
  animation-delay: 0.5s;
}

.tree-item:nth-child(11) {
  animation-delay: 0.55s;
}

.tree-item:nth-child(12) {
  animation-delay: 0.6s;
}

.tree-item:nth-child(13) {
  animation-delay: 0.65s;
}

.tree-item:nth-child(14) {
  animation-delay: 0.7s;
}

.tree-item:nth-child(15) {
  animation-delay: 0.75s;
}

.tree-item:nth-child(16) {
  animation-delay: 0.8s;
}

.tree-item:nth-child(17) {
  animation-delay: 0.85s;
}

.tree-item:nth-child(18) {
  animation-delay: 0.9s;
}

.tree-item:nth-child(19) {
  animation-delay: 0.95s;
}

.tree-item:nth-child(20) {
  animation-delay: 1.0s;
}

@keyframes growTree {
  from {
    transform: scale(0);
    opacity: 0;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

.tree-info {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--color-text);
  font-weight: 500;
}

/* Info Cards Section */
.info-cards {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.info-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.1);
  background: white;
}

.info-card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.info-card:nth-child(1) .info-card-icon {
  color: var(--color-secondary);
}

.info-card:nth-child(2) .info-card-icon {
  color: var(--color-primary);
}

.info-card:nth-child(3) .info-card-icon {
  color: var(--color-accent);
}

.info-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  color: var(--color-text-dark);
  margin-bottom: 0.75rem;
}

.info-card p {
  color: var(--color-text);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.info-card:nth-child(1) {
  border-top: 4px solid var(--color-secondary);
}

.info-card:nth-child(2) {
  border-top: 4px solid var(--color-primary);
}

.info-card:nth-child(3) {
  border-top: 4px solid var(--color-accent);
}

/* Content Page */
.content-page {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.content-card {
  background: white;
  border-radius: 1.5rem;
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.content-card h1 {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2rem;
}

.content-card h2 {
  font-size: 1.75rem;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  color: var(--color-text-dark);
  margin: 2.5rem 0 1.5rem;
  padding-left: 1rem;
  border-left: 4px solid var(--color-primary);
}

.content-card p {
  color: var(--color-text);
  margin-bottom: 1.5rem;
  line-height: 1.8;
  font-size: 1.05rem;
}

.content-card ul {
  margin-left: 2rem;
  margin-bottom: 1.5rem;
}

.content-card li {
  color: var(--color-text);
  margin-bottom: 0.75rem;
  font-size: 1.05rem;
}

/* Footer */
.footer {
  background: linear-gradient(135deg, var(--color-text-dark) 0%, #1F2937 100%);
  color: white;
  padding: 3rem 1.5rem;
  margin-top: 5rem;
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  text-align: center;
}

.footer p {
  margin-bottom: 1rem;
  font-size: 1rem;
}

.footer a {
  color: var(--color-primary-light);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

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

/* Scroll to Top Button */
#scrollToTop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: none;
  opacity: 0;
  transition: all 0.3s;
  z-index: 100;
}

#scrollToTop:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* Navbar Donation Button */
.nav-donation-btn {
  display: inline-flex !important;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 1rem !important;
  background: linear-gradient(135deg, #059669, #10B981) !important;
  color: white !important;
  border-radius: 2rem !important;
  font-weight: 700 !important;
  font-size: 0.9rem !important;
  text-decoration: none !important;
  -webkit-text-fill-color: white !important;
  animation: navPulse 2s ease-in-out infinite;
  box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.5);
  transition: transform 0.2s, box-shadow 0.2s !important;
}

.nav-donation-btn:hover {
  transform: translateY(-2px) scale(1.05) !important;
  box-shadow: 0 4px 16px rgba(5, 150, 105, 0.5) !important;
  background: linear-gradient(135deg, #047857, #059669) !important;
  color: white !important;
}

.nav-donation-btn::after {
  display: none !important;
}

@keyframes navPulse {
  0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.5); }
  50% { box-shadow: 0 0 0 8px rgba(5, 150, 105, 0); }
  100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

/* Pulsing Donation Button (in result section) */
.btn-donation-pulse {
  display: inline-block;
  padding: 0.9rem 2rem;
  background: linear-gradient(135deg, #059669, #10B981);
  color: white !important;
  -webkit-text-fill-color: white !important;
  border: none;
  border-radius: 0.75rem;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  text-decoration: none;
  cursor: pointer;
  animation: donationBlink 1.5s ease-in-out infinite;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.4);
  transition: transform 0.2s;
}

.btn-donation-pulse:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.55);
  animation-play-state: paused;
}

@keyframes donationBlink {
  0%, 100% {
    background: linear-gradient(135deg, #059669, #10B981);
    box-shadow: 0 4px 14px rgba(5, 150, 105, 0.4);
    transform: scale(1);
  }
  50% {
    background: linear-gradient(135deg, #10B981, #6EE7B7);
    box-shadow: 0 6px 24px rgba(5, 150, 105, 0.65);
    transform: scale(1.04);
  }
}

/* Floating Donation Widget */
.floating-donation {
  position: fixed;
  bottom: 6rem;
  right: 1.5rem;
  z-index: 200;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #059669, #10B981);
  border-radius: 1rem;
  box-shadow: 0 8px 30px rgba(5, 150, 105, 0.45);
  overflow: hidden;
  animation: floatIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards, floatPulse 3s ease-in-out 0.6s infinite;
  max-width: 200px;
}

@keyframes floatIn {
  from { opacity: 0; transform: translateX(60px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes floatPulse {
  0%, 100% { box-shadow: 0 8px 30px rgba(5, 150, 105, 0.45); }
  50% { box-shadow: 0 8px 40px rgba(5, 150, 105, 0.7); }
}

.floating-donation-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: white !important;
  -webkit-text-fill-color: white !important;
  flex: 1;
  transition: background 0.2s;
}

.floating-donation-link:hover {
  background: rgba(255,255,255,0.1);
}

.floating-donation-icon {
  font-size: 1.6rem;
  line-height: 1;
  flex-shrink: 0;
}

.floating-donation-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.floating-donation-title {
  font-weight: 700;
  font-size: 0.85rem;
  color: white;
  -webkit-text-fill-color: white !important;
}

.floating-donation-sub {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.85);
  -webkit-text-fill-color: rgba(255,255,255,0.85) !important;
  font-weight: 600;
}

.floating-donation-close {
  background: rgba(0,0,0,0.15);
  border: none;
  color: white;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0 0.6rem;
  align-self: stretch;
  display: flex;
  align-items: center;
  transition: background 0.2s;
  border-left: 1px solid rgba(255,255,255,0.2);
}

.floating-donation-close:hover {
  background: rgba(0,0,0,0.25);
}

@media (max-width: 768px) {
  .floating-donation {
    bottom: 5rem;
    right: 1rem;
    max-width: 180px;
  }

  .floating-donation-title {
    font-size: 0.8rem;
  }

  .floating-donation-sub {
    font-size: 0.7rem;
  }
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1rem;
}

.lang-btn {
  background: none;
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--color-text-light);
  transition: color 0.2s;
  padding: 0.25rem;
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  color: var(--color-primary);
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 2rem 1.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .calculator-section {
    position: static;
  }

  .calculator-card {
    padding: 1.5rem;
  }

  .result-number {
    font-size: 2rem;
  }

  .result-section {
    padding: 1.5rem;
  }

  .content-card {
    padding: 2rem 1.5rem;
  }

  .info-card-icon {
    font-size: 2rem;
  }

  .navbar-logo {
    font-size: 1.25rem;
  }

  .logo-project-name {
    font-size: 1.25rem;
  }

  .logo-school-name {
    font-size: 0.55rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .calculator-card {
    padding: 1rem;
  }

  .btn-primary {
    font-size: 1rem;
    padding: 0.875rem 1.5rem;
  }

  .tree-grid {
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 0.75rem;
  }

  .tree-item {
    font-size: 2.5rem;
  }
}