:root {
  --c-primary: #0f6e56;
  --c-primary-strong: #0b5a46;
  --c-primary-deep: #0d2e10;
  --c-primary-mid: #1a5c20;
  --c-primary-soft: #2d7a3a;
  --c-accent: #d4872a;
  --c-program-accent: #7de88a;
  --c-bg: #f9f6f1;
  --c-surface: #ffffff;
  --c-text: #1a1a1a;
  --c-muted: #5a5a5a;
  --c-border: #e2ddd6;
  --c-success: #2e9159;
  --shadow-soft: 0 10px 28px rgba(15, 110, 86, 0.1);
  --radius: 14px;
  --container: 1180px;
  --space-xs: 0.5rem;
  --space-sm: 0.875rem;
  --space-md: 1.25rem;
  --space-lg: 2.5rem;
  --space-xl: 4.5rem;
  --ff-heading: "Merriweather", "Georgia", serif;
  --ff-body: "Manrope", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--ff-body);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.65;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--ff-heading);
  margin: 0 0 var(--space-sm);
  line-height: 1.25;
}

p {
  margin: 0 0 var(--space-sm);
  color: var(--c-muted);
}

main {
  min-height: 70vh;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section {
  padding: var(--space-xl) 0;
}

.section-title {
  font-size: clamp(1.6rem, 2.4vw, 2.5rem);
  color: var(--c-primary-strong);
}

.section-subtitle {
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-weight: 700;
  font-size: 0.78rem;
  margin-bottom: var(--space-xs);
}

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.btn {
  border: 0;
  border-radius: 999px;
  padding: 0.78rem 1.35rem;
  cursor: pointer;
  text-decoration: none;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  filter: brightness(0.97);
}

.btn-primary {
  background: var(--c-primary);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--c-primary-strong);
  border: 1px solid var(--c-primary);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  padding: 0.24rem 0.68rem;
  color: var(--c-primary-strong);
  background: #fff;
  font-size: 0.82rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--c-accent);
  color: #111;
  padding: 8px;
  z-index: 200;
}

.skip-link:focus {
  top: 0;
}

@media (max-width: 860px) {
  .section {
    padding: 3.5rem 0;
  }
}

/* Floating Back to Top Button */
.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #0f6e56;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all 0.3s ease;
    z-index: 999;
    /* Enhanced shadow - THIS IS THE CHANGE */
    box-shadow: 0 8px 20px rgba(51, 228, 207, 0.759), 0 2px 4px rgba(0, 0, 0, 0.1);
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    background: #157c67;
    transform: translateY(-2px);
    /* Even stronger shadow on hover */
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25), 0 4px 8px rgba(0, 0, 0, 0.15);
}

.scroll-top-btn:active {
    transform: translateY(1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Mobile adjustment */
@media (max-width: 768px) {
    .scroll-top-btn {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
    }
}