:root {
  --font-base: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-heading: "Poppins", var(--font-base);
  --color-primary: #0f3b70;
  --color-accent: #f8aa27;
  --color-surface: #ffffff;
  --color-background: #f4f6fb;
  --color-muted: #556987;
  --color-dark: #0b172d;
  --shadow-card: 0 20px 50px rgba(15, 59, 112, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --spacing-section: clamp(3.5rem, 6vw, 6rem);
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-base);
  color: var(--color-dark);
  background: var(--color-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

.narrow {
  width: min(720px, 92vw);
  margin-inline: auto;
}

.text-center {
  text-align: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border: none;
  border-radius: 999px;
  padding: 0.85rem 2rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.2s ease;
}

.btn-primary {
  background: linear-gradient(120deg, var(--color-primary), #1c4f93);
  color: #fff;
  box-shadow: 0 16px 35px rgba(15, 59, 112, 0.25);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  background: linear-gradient(120deg, #174276, #255ca0);
}

header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(244, 246, 251, 0.9);
  border-bottom: 1px solid rgba(15, 59, 112, 0.1);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  background: var(--color-surface);
  padding: 0.25rem;
  box-shadow: 0 10px 25px rgba(15, 59, 112, 0.15);
}

.brand-name {
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 1.6rem;
  align-items: center;
  font-weight: 500;
  color: var(--color-muted);
}

.nav-links a {
  position: relative;
  padding-block: 0.25rem;
}

.nav-links a::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.4rem;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.hero {
  position: relative;
  min-height: clamp(420px, 70vw, 620px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: #fff;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(11, 23, 45, 0.78), rgba(15, 59, 112, 0.55));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-inline: 1rem;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 6vw, 4rem);
  letter-spacing: 0.08em;
}

.hero-slides {
  list-style: none;
  margin: 0;
  padding: 0;
  position: absolute;
  inset: 0;
}

.hero-slides li {
  position: absolute;
  inset: 0;
  opacity: 0;
  animation: heroFade 21s infinite;
}

.hero-slides li:nth-child(1) {
  animation-delay: 0s;
}

.hero-slides li:nth-child(2) {
  animation-delay: 7s;
}

.hero-slides li:nth-child(3) {
  animation-delay: 14s;
}

.hero-slides img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05);
}

@keyframes heroFade {
  0% {
    opacity: 0;
    transform: scale(1.05);
  }
  8%,
  28% {
    opacity: 1;
    transform: scale(1);
  }
  36%,
  100% {
    opacity: 0;
    transform: scale(1.04);
  }
}

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

.section-heading {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  text-align: center;
  color: var(--color-dark);
}

.feature-grid {
  display: grid;
  gap: 1.8rem;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 2rem;
  display: grid;
  gap: 1.2rem;
}

.feature-card figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.feature-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.feature-card h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  text-align: center;
}

.feature-card p {
  margin: 0;
  color: var(--color-muted);
  text-align: center;
  font-size: 1.02rem;
}

@media (min-width: 860px) {
  .feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.split-section {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.split-section + .split-section {
  margin-top: var(--spacing-section);
}

.split-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.split-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.split-content h2 {
  margin: 0 0 1.2rem;
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 4vw, 2.4rem);
}

.split-content p {
  margin: 0 0 0.9rem;
  color: var(--color-muted);
  font-size: 1.05rem;
}

@media (min-width: 900px) {
  .split-section {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split-section.reverse .split-media {
    order: 2;
  }

  .split-section.reverse .split-content {
    order: 1;
  }
}

.cta-banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  color: #fff;
}

.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(11, 23, 45, 0.72), rgba(15, 59, 112, 0.62));
  z-index: 1;
}

.cta-banner img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05);
}

.cta-content {
  position: relative;
  z-index: 2;
  padding: clamp(3rem, 6vw, 4.5rem);
  display: grid;
  gap: 1.5rem;
  justify-items: center;
  text-align: center;
}

.cta-content h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 2.8rem);
}

.donation-content,
.contact-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: clamp(2.2rem, 5vw, 3.2rem);
  display: grid;
  gap: 1.4rem;
}

.donation-content form {
  display: inline-block;
}

.donation-content p,
.contact-content p,
.contact-content h3 {
  margin: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.contact-content form {
  display: grid;
  gap: 1rem;
}

.contact-content label {
  display: grid;
  gap: 0.45rem;
  font-weight: 600;
  color: var(--color-dark);
}

.contact-content input,
.contact-content textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(15, 59, 112, 0.2);
  font: inherit;
  color: var(--color-dark);
  background: rgba(255, 255, 255, 0.9);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-content input:focus,
.contact-content textarea:focus {
  outline: none;
  border-color: rgba(15, 59, 112, 0.65);
  box-shadow: 0 0 0 4px rgba(15, 59, 112, 0.15);
}

.contact-content textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-content button {
  justify-self: start;
  border: none;
  border-radius: 999px;
  padding: 0.85rem 2rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(120deg, var(--color-primary), #1c4f93);
  box-shadow: 0 16px 35px rgba(15, 59, 112, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.2s ease;
}

.contact-content button:hover,
.contact-content button:focus-visible {
  transform: translateY(-2px);
  background: linear-gradient(120deg, #174276, #255ca0);
}

.contact-details {
  display: grid;
  gap: 1rem;
}

.contact-details h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-dark);
}

footer {
  margin-top: var(--spacing-section);
  padding-block: 3rem;
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.75);
}

footer .footer-content {
  display: grid;
  gap: 1.4rem;
  justify-items: center;
  text-align: center;
  font-size: 0.95rem;
}

footer .brand-name {
  color: rgba(255, 255, 255, 0.85);
}

@media (max-width: 720px) {
  header {
    position: static;
  }

  .nav-links {
    display: none;
  }

  .feature-card img {
    height: 200px;
  }
}