:root {
  --color-primary: #2f6b46;
  --color-primary-dark: #1e4a2f;
  --color-accent: #c9873f;
  --color-accent-dark: #a66f2e;
  --color-text: #24292f;
  --color-background: #fdfbf7;
  --color-muted: #f1efe7;
  --color-border: #e2ded2;
  --font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-heading: Georgia, "Times New Roman", serif;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.5rem;
  --shadow-md: 0 6px 18px rgba(36, 41, 47, 0.08);
  --max-content-width: 60rem;
  --header-height: 4.75rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.5;
}

.container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  padding-top: var(--spacing-md);
  padding-bottom: var(--spacing-md);
}

.site-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  letter-spacing: 0.02em;
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* Hamburger menu toggle */

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  background-color: transparent;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 1.25rem;
  height: 2px;
  border-radius: 1px;
  background-color: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-icon {
  position: relative;
}

.menu-icon::before,
.menu-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-icon::before {
  transform: translateY(-6px);
}

.menu-icon::after {
  transform: translateY(6px);
}

.menu-toggle[aria-expanded="true"] .menu-icon {
  background-color: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-icon::before {
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-icon::after {
  transform: rotate(-45deg);
}

/* Off-canvas navigation panel */

.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 20;
  width: min(20rem, 85vw);
  height: 100%;
  background-color: var(--color-background);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl) var(--spacing-lg);
  transform: translateX(100%);
  transition: transform 0.25s ease;
}

.site-nav.is-open {
  transform: translateX(0);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

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

.nav-list a[aria-current="page"] {
  color: var(--color-primary-dark);
  font-weight: 800;
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 10;
  background-color: rgba(31, 41, 55, 0.4);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .site-nav,
  .menu-icon,
  .menu-icon::before,
  .menu-icon::after {
    transition: none;
  }
}

/* Swiper container: full-height section-by-section paging below the sticky header */

.swiper {
  height: calc(100vh - var(--header-height));
  height: calc(100svh - var(--header-height));
}

/* Sections (Home, About, Contact) */

.section {
  display: grid;
  align-content: center;
  height: 100%;
  overflow-y: auto;
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

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

/* Hero (Home section) */

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--spacing-lg);
}

.hero h1 {
  max-width: 40rem;
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary-dark);
}

.hero-tagline {
  max-width: 36rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: #445048;
}

.donate-button {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 700;
  color: #ffffff;
  background-color: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  padding: 1rem 2.25rem;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.donate-button:hover,
.donate-button:focus-visible {
  background-color: var(--color-accent-dark);
}

.donate-note {
  font-size: 0.95rem;
  color: #555555;
}

/* Section content (About, Contact) */

.page h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.75rem);
  color: var(--color-primary-dark);
}

.page p {
  max-width: 42rem;
  font-size: 1.15rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 32rem;
  margin-top: var(--spacing-lg);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-field label {
  font-weight: 600;
}

.form-field input,
.form-field textarea {
  font: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
}

.form-field input:focus-visible,
.form-field textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.form-field textarea {
  resize: vertical;
}

.contact-alternate {
  margin-top: var(--spacing-lg);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  font-size: 0.9rem;
  color: #555555;
}