:root {
  --clr-bg: #f3f7f5;
  --clr-surface: #ffffff;
  --clr-ink: #0f2a28;
  --clr-muted: #3d5a56;
  --clr-accent: #0d8a6a;
  --clr-accent-deep: #066b52;
  --clr-teal: #148f8c;
  --clr-line: rgba(15, 42, 40, 0.12);
  --clr-hero-from: #043d36;
  --clr-hero-to: #0a6b58;
  --font-body: "Hind Siliguri", "Noto Sans Bengali", sans-serif;
  --font-display: "Noto Serif Bengali", "Hind Siliguri", serif;
  --space: clamp(1rem, 3vw, 2rem);
  --max: 68rem;
  --radius: 0.35rem;
  --shadow-soft: 0 18px 40px rgba(4, 40, 34, 0.12);
  --header-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--clr-ink);
  background: var(--clr-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--clr-accent-deep);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--clr-ink);
  color: #fff;
  padding: 0.5rem 0.85rem;
  z-index: 100;
  border-radius: var(--radius);
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 247, 245, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--clr-line);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem var(--space);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--clr-ink);
  font-weight: 700;
  font-size: 1.05rem;
}

.site-brand__logo {
  width: 2.35rem;
  height: 2.35rem;
  object-fit: contain;
  border-radius: 50%;
  background: #fff;
}

.site-brand__name {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.site-nav {
  display: none;
  gap: 1.1rem;
  font-size: 0.95rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--clr-muted);
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--clr-accent-deep);
}

.site-header__actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn--primary:hover {
  background: var(--clr-accent-deep);
}

.btn--ghost {
  background: transparent;
  color: var(--clr-ink);
  border-color: var(--clr-line);
}

.btn--ghost:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent-deep);
}

.btn--on-dark {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

.btn--on-dark:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

.btn--ghost-dark {
  background: transparent;
  color: var(--clr-ink);
  border-color: rgba(15, 42, 40, 0.25);
}

.btn--lg {
  padding: 0.8rem 1.35rem;
  font-size: 1.02rem;
}

.hero {
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(45, 190, 160, 0.35), transparent 55%),
    radial-gradient(ellipse 60% 50% at 15% 80%, rgba(20, 120, 140, 0.4), transparent 50%),
    linear-gradient(155deg, var(--clr-hero-from) 0%, var(--clr-hero-to) 48%, #0e8f7a 100%);
  transform: scale(1.02);
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.35;
  mask-image: linear-gradient(to bottom, #000 10%, transparent 95%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3rem) var(--space);
}

.hero__eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  opacity: 0.88;
}

.hero__title {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  max-width: 14ch;
}

.hero__lead {
  margin: 0 0 1.25rem;
  max-width: 100%;
  font-size: clamp(1rem, 2vw, 1.15rem);
  opacity: 0.92;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section--tint {
  background: linear-gradient(180deg, #e8f3ef 0%, var(--clr-bg) 100%);
}

.section--join {
  background:
    radial-gradient(ellipse 50% 80% at 100% 0%, rgba(13, 138, 106, 0.12), transparent 55%),
    var(--clr-surface);
  border-top: 1px solid var(--clr-line);
  border-bottom: 1px solid var(--clr-line);
}

.section__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space);
}

.section__inner--narrow {
  max-width: 40rem;
  text-align: center;
}

.section__inner--narrow .hero__cta {
  justify-content: center;
}

.section__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.25;
  color: var(--clr-ink);
}

.section__lead {
  margin: 0 0 2rem;
  max-width: 100%;
  color: var(--clr-muted);
  font-size: 1.08rem;
}

.goal-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.goal-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.95rem 1rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-line);
  border-radius: var(--radius);
  box-shadow: 0 1px 0 var(--clr-line);
}

.goal-item .feature-icon {
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.goal-item > span:last-child {
  flex: 1;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  color: var(--clr-accent-deep);
  background: linear-gradient(145deg, #e6f7f1 0%, #d4f0e8 100%);
  border: 1px solid rgba(13, 138, 106, 0.15);
}

.feature-icon svg {
  width: 1.35rem;
  height: 1.35rem;
}

.feature-icon--section {
  width: 3.25rem;
  height: 3.25rem;
  margin-bottom: 0.75rem;
}

.feature-icon--section svg {
  width: 1.6rem;
  height: 1.6rem;
}

.feature-icon--join {
  margin-left: auto;
  margin-right: auto;
}

.section-head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 0.75rem;
}

.section-head .section__title {
  margin: 0;
}

.card-panel {
  background: var(--clr-surface);
  border: 1px solid var(--clr-line);
  border-radius: calc(var(--radius) + 2px);
  padding: 1.15rem 1.15rem 1.25rem;
  box-shadow: 0 8px 24px rgba(4, 40, 34, 0.05);
}

.card-panel .feature-icon {
  margin-bottom: 0.75rem;
}

.split-block {
  display: grid;
  gap: 1.5rem;
}

.split-block__item h3,
.method-item h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.split-block__item ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--clr-muted);
}

.split-block__item li + li {
  margin-top: 0.35rem;
}

.method-grid {
  display: grid;
  gap: 1.25rem;
}

.method-item p {
  margin: 0;
  color: var(--clr-muted);
}

.status-msg {
  color: var(--clr-muted);
  margin: 0;
}

.status-msg.is-error {
  color: #9b2c2c;
}

.campaign-list,
.event-list {
  display: grid;
  gap: 1rem;
}

.campaign-item,
.event-item {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  padding: 1.15rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-line);
  border-radius: calc(var(--radius) + 2px);
  box-shadow: 0 6px 18px rgba(4, 40, 34, 0.05);
}

.campaign-item .feature-icon,
.event-item .feature-icon {
  flex-shrink: 0;
}

.campaign-item__body,
.event-item__body {
  flex: 1;
  min-width: 0;
}

.campaign-item h3,
.event-item h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

.campaign-item p,
.event-item p {
  margin: 0;
  color: var(--clr-muted);
}

.event-item__meta {
  display: inline-block;
  margin-bottom: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--clr-accent-deep);
  letter-spacing: 0.01em;
}

.site-footer {
  padding: 2.5rem 0 3rem;
  background: #062925;
  color: rgba(255, 255, 255, 0.82);
}

.site-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space);
  text-align: center;
}

.site-footer p {
  margin: 0 0 0.4rem;
}

.site-footer__meta {
  opacity: 0.75;
  font-size: 0.95rem;
}

.site-footer__links a {
  color: #9fe8d4;
  text-decoration: none;
  font-size: 0.92rem;
}

.site-footer__links a:hover {
  text-decoration: underline;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.hero .reveal {
  transition-duration: 0.8s;
}

.hero .reveal:nth-child(2) {
  transition-delay: 0.08s;
}

.hero .reveal:nth-child(3) {
  transition-delay: 0.16s;
}

.hero .reveal:nth-child(4) {
  transition-delay: 0.24s;
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }

  .split-block {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .method-grid {
    grid-template-columns: 1fr 1fr;
  }

  .campaign-list,
  .event-list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .method-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover {
    transform: none;
  }
}