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

button, .cta-button, .donate-btn, .submit-btn,
.nav-menu a, .logo, .nav-toggle {
  user-select: none;
}

html {
  scrollbar-gutter: stable;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #0A1432;
  color: white;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 10001;
  padding: 0.75rem 1.25rem;
  background: #fff;
  color: #0A1432;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid rgba(90, 166, 120, 0.9);
  outline-offset: 2px;
}

/* Mountain Background */
.mountain-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.mountain-background svg {
  width: 100%;
  height: 100%;
  display: block;
}

.page-hero--blurred {
  filter: blur(5px);
}

#hero, .nav-header, .features {
  content-visibility: visible;
}

h1 {
  font-size: clamp(2rem, 5vw + 1rem, 4rem);
  margin-bottom: 1.5rem;
}

p {
  font-size: 1.8rem;
  margin-bottom: 2.5rem;
  opacity: 0.9;
}

button, .cta-button {
  display: inline-block;
  padding: 1.4rem 3.5rem;
  font-size: 1.4rem;
  background: #1E8C5A;
  color: white;
  border: 1px solid rgba(90, 166, 120, 0.3);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  transition: opacity 0.3s ease, background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  z-index: 1;
}

button::before, .cta-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: left 0.4s ease;
  z-index: 0;
}

button:hover, .cta-button:hover {
  background: #166840;
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
}

button:hover::before, .cta-button:hover::before {
  left: 100%;
}

/* ===== NAVIGATION HEADER ===== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 20, 50, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(90, 166, 120, 0.08);
  z-index: 1000;
  padding: 1rem 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.nav-header.visible {
  opacity: 1;
  pointer-events: auto;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-menu a {
  color: white;
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              color 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              background-color 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  font-weight: 500;
  position: relative;
  padding: 0.4rem 0.6rem;
}

.nav-menu a:hover,
.nav-menu a.active {
  opacity: 1;
  color: #5AA678;
}

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 0.4rem;
  left: 0;
  right: 0;
  height: 2px;
  background: #5AA678;
}

.content-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

/* Footer */
.footer {
  background: linear-gradient(180deg, #060d24 0%, #040a1c 100%);
  border-top: 1px solid rgba(90, 166, 120, 0.3);
  padding: 4rem 2rem 0;
  margin-top: 0;
  position: relative;
  z-index: 10;
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 5rem;
  padding-bottom: 3rem;
}

.footer-section h3 {
  font-size: 1.5rem;
  color: #5AA678;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.footer-section h3::after {
  content: '';
  display: block;
  width: 36px;
  height: 2px;
  background: rgba(90, 166, 120, 0.5);
  margin-top: 0.6rem;
  border-radius: 2px;
}

.footer-section h4 {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1.4rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.footer-section p {
  font-size: 0.95rem;
  line-height: 1.8;
  opacity: 0.55;
  max-width: 360px;
  margin-bottom: 0;
}

.quick-links-section ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem 1.5rem;
}

.quick-links-section a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.25s ease, padding-left 0.25s ease;
  display: inline-block;
}

.quick-links-section a:hover {
  color: #5AA678;
  padding-left: 5px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 1.6rem 0;
  text-align: center;
  max-width: 1100px;
  margin: 0 auto;
}

.footer-bottom p {
  font-size: 0.8rem;
  opacity: 0.35;
  margin-bottom: 0;
  letter-spacing: 0.04em;
}

.footer-legal-link {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-legal-link:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }

  .footer-section h3::after {
    margin: 0.6rem auto 0;
  }

  .footer-section p {
    max-width: 100%;
  }

  .quick-links-section ul {
    justify-items: center;
  }
}
/* ===== HAMBURGER TOGGLE BUTTON ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  padding: 6px;
  transition: background 0.2s ease;
  flex-shrink: 0;
  box-shadow: none;
  animation: none;
  z-index: 1001;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: none;
  box-shadow: none;
  letter-spacing: normal;
  animation: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              opacity 0.3s ease,
              width 0.3s ease;
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  width: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
@media (max-width: 768px) {
  /* --- Navigation --- */
  .nav-header {
    padding: 0.9rem 1.2rem;
  }

  .nav-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 0;
    position: relative;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: calc(100% + 0.9rem);
    left: -1.2rem;
    right: -1.2rem;
    background: rgba(10, 20, 50, 0.98);
    backdrop-filter: blur(16px);
    border-top: 1px solid rgba(90, 166, 120, 0.1);
    border-bottom: 1px solid rgba(90, 166, 120, 0.1);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
    z-index: 999;
    animation: none;
  }

  .nav-header.menu-open .nav-menu {
    display: flex;
  }

  .nav-menu a {
    padding: 0.9rem 1.8rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    opacity: 0.85;
  }

  .nav-menu a:last-child {
    border-bottom: none;
  }

  .nav-menu a.active::after {
    display: none;
  }

  .nav-menu a.active {
    color: #5AA678;
    background: rgba(90, 166, 120, 0.08);
    opacity: 1;
  }
}

@media (max-width: 768px) {
  /* --- Hero section typography --- */
  p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
  }

  button {
    padding: 1rem 2.2rem;
    font-size: 1.1rem;
  }

  .cta-button {
    padding: 1rem 2.2rem;
    font-size: 1.1rem;
  }
}

@media (max-width: 768px) {
  /* --- Shared: tighten content-container horizontal padding on small screens --- */
  .content-container {
    padding: 0 1.2rem;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.1rem;
  }

  p {
    font-size: 1rem;
  }

  .cta-button,
  button {
    padding: 0.85rem 1.8rem;
    font-size: 1rem;
  }

}

@media (max-width: 480px) {
  .footer {
    padding: 2rem 1rem 0.8rem;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none !important;
  }

  .nav-menu {
    display: flex !important;
  }
}

/* Shared content utilities (CSP: no inline style attributes) */
.accent-link {
  color: #5AA678;
}

.text-link {
  color: inherit;
  text-decoration: underline;
}

.about-section--spaced {
  margin-bottom: 2.5rem;
}

.why-challenge-section {
  margin-top: 3rem;
}

.why-challenge-section h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.why-challenge-section p {
  opacity: 0.8;
  line-height: 1.7;
}