:root {
  --page: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef6ff;
  --ink: #101828;
  --muted: #5f6b7a;
  --line: #dde3ea;
  --line-strong: #c5ced9;
  --blue: #6bb8ff;
  --blue-dark: #135f9d;
  --shadow: 0 18px 42px rgba(23, 43, 77, 0.09);
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--page);
  font-family: Inter, Arial, sans-serif;
  line-height: 1.55;
}

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

button,
select {
  color: inherit;
  font: inherit;
}

button,
select {
  cursor: pointer;
}

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

button:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(107, 184, 255, 0.48);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 2000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  transform: translateY(-150%);
  border-radius: 5px;
  color: #fff;
  background: var(--ink);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(1220px, calc(100% - 40px));
  margin-inline: auto;
}

.site-announcement {
  color: #fff;
  background: var(--ink);
  font-size: 0.75rem;
}

.site-announcement .container {
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.site-announcement a {
  color: var(--blue);
  font-weight: 750;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
}

.nav-container {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  flex: 0 0 auto;
  color: var(--ink);
  font-size: 1.45rem;
  font-weight: 850;
  letter-spacing: -0.045em;
}

.logo span {
  color: var(--blue);
}

.nav {
  height: 72px;
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav a {
  color: #475467;
  font-size: 0.82rem;
  font-weight: 650;
}

.nav a:hover {
  color: var(--blue-dark);
}

.nav-sign-in {
  min-height: 38px;
  display: inline-flex;
  padding: 0 14px;
  align-items: center;
  border: 1px solid var(--blue);
  border-radius: 6px;
  color: var(--ink) !important;
  background: var(--surface-soft);
}

.hamburger {
  position: relative;
  width: 42px;
  height: 42px;
  display: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.hamburger span {
  position: absolute;
  left: 10px;
  width: 20px;
  height: 2px;
  background: var(--ink);
}

.hamburger span:nth-child(1) {
  top: 13px;
}
.hamburger span:nth-child(2) {
  top: 19px;
}
.hamburger span:nth-child(3) {
  top: 25px;
}

.hamburger.active {
  background: #fff url("icons/times-svgrepo-com.svg") center / 22px no-repeat;
}

.hamburger.active span {
  opacity: 0;
}

.contribute-hero {
  padding: 34px 0 0;
}

.contribute-hero-panel {
  position: relative;
  min-height: 470px;
  display: flex;
  padding: clamp(42px, 6vw, 76px);
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background:
    linear-gradient(132deg, transparent 0 66%, rgba(107, 184, 255, 0.36) 66%),
    linear-gradient(132deg, #fff 0 55%, var(--surface-soft) 55%);
}

.contribute-hero-panel::before,
.contribute-hero-panel::after {
  position: absolute;
  right: -70px;
  width: 520px;
  aspect-ratio: 1;
  border: 1px solid rgba(19, 95, 157, 0.16);
  border-radius: 50%;
  content: "";
}

.contribute-hero-panel::before {
  top: -120px;
}
.contribute-hero-panel::after {
  top: -35px;
  right: 25px;
  width: 370px;
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(680px, 68%);
}

.eyebrow {
  color: var(--blue-dark);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-copy h1 {
  max-width: 650px;
  margin-top: 16px;
  font-size: clamp(2.8rem, 5vw, 4.6rem);
  line-height: 1;
  letter-spacing: -0.06em;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 620px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  margin-top: 28px;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  padding: 9px 18px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--blue);
  border-radius: 6px;
  color: var(--ink);
  background: var(--blue);
  font-size: 0.84rem;
  font-weight: 750;
}

.button:hover {
  background: #79bcff;
}

.button.secondary {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.82);
}

.contribution-strip {
  padding: 28px 0;
}

.contribution-strip-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.contribution-strip-grid > div {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 0 28px;
  border-right: 1px solid var(--line);
}

.contribution-strip-grid > div:last-child {
  border-right: 0;
}
.contribution-strip-grid img {
  width: 23px;
  height: 23px;
}
.contribution-strip-grid p,
.contribution-strip-grid strong,
.contribution-strip-grid span {
  display: block;
}
.contribution-strip-grid strong {
  font-size: 0.83rem;
}
.contribution-strip-grid span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.7rem;
}

.contribute-section {
  padding: 58px 0;
}

.feedback-section,
.other-ways {
  background: #fff;
}

.two-column-grid,
.donation-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  align-items: center;
  gap: clamp(48px, 8vw, 110px);
}

.section-copy h2,
.section-head h2 {
  max-width: 610px;
  margin-top: 10px;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.05em;
}

.lead {
  max-width: 650px;
  margin-top: 17px;
  color: var(--muted);
}

.text-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--blue-dark);
  font-weight: 750;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.feedback-card,
.wallet-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
}

.feedback-card h3,
.wallet-card h3 {
  font-size: 1.15rem;
}

.feedback-card ul {
  display: grid;
  margin: 18px 0 24px 20px;
  gap: 10px;
  color: var(--muted);
  font-size: 0.88rem;
}

.donation-section {
  scroll-margin-top: 90px;
}

.cost-note {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  margin-top: 24px;
  padding: 15px;
  gap: 11px;
  border: 1px solid #c7daf6;
  border-radius: 7px;
  background: var(--surface-soft);
  color: #344054;
  font-size: 0.78rem;
}

.cost-note img {
  width: 22px;
  height: 22px;
}

.wallet-card-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.wallet-card-heading h3 {
  margin-top: 4px;
}

.wallet-card label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
}

.wallet-card select {
  min-height: 40px;
  padding: 0 34px 0 11px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: #fff;
  font-size: 0.8rem;
}

.wallet-description {
  margin-top: 24px;
  color: var(--muted);
  font-size: 0.83rem;
}

.wallet-address-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  margin-top: 10px;
  gap: 9px;
}

.wallet-address-wrap code {
  min-height: 48px;
  display: flex;
  padding: 11px 12px;
  align-items: center;
  overflow-wrap: anywhere;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--page);
  font-size: 0.76rem;
}

.copy-button {
  min-height: 48px;
  display: inline-flex;
  padding: 9px 14px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--blue);
  border-radius: 6px;
  background: var(--surface-soft);
  font-size: 0.78rem;
  font-weight: 750;
}

.copy-button img {
  width: 17px;
  height: 17px;
}
.copy-status {
  min-height: 20px;
  margin-top: 9px;
  color: #16794c;
  font-size: 0.74rem;
  font-weight: 700;
}
.wallet-owner {
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.7rem;
}

.section-head {
  margin-bottom: 24px;
}

.other-ways-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.other-ways-grid > a {
  min-height: 190px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 24px;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  transition: 0.18s ease;
}

.other-ways-grid > a:hover {
  border-color: #a9b8c9;
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.other-ways-grid img {
  width: 28px;
  height: 28px;
}
.other-ways-grid h3 {
  font-size: 0.98rem;
}
.other-ways-grid p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.82rem;
}
.other-ways-grid span {
  color: var(--blue-dark);
  font-size: 0.76rem;
  font-weight: 750;
}

.footer {
  padding: 46px 0 20px;
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.4fr) repeat(3, minmax(140px, 1fr));
  gap: 42px;
}

.footer-brand p,
.footer-column a,
.footer-bottom {
  color: var(--muted);
  font-size: 0.78rem;
}

.footer-brand p {
  max-width: 340px;
  margin-top: 13px;
}
.footer-brand .trademark-note {
  font-size: 0.65rem;
}
.footer-column {
  display: grid;
  align-content: start;
  gap: 8px;
}
.footer-column h2 {
  margin-bottom: 3px;
  font-size: 0.8rem;
}
.footer-column a:hover {
  color: var(--blue-dark);
}
.footer-bottom {
  display: flex;
  margin-top: 34px;
  padding-top: 17px;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  .nav {
    position: absolute;
    top: 100%;
    right: 20px;
    left: 20px;
    height: auto;
    display: none;
    padding: 8px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .nav.active {
    display: flex;
  }
  .nav a {
    padding: 11px;
    border-radius: 5px;
  }
  .hamburger {
    display: block;
  }
  .hero-copy {
    width: min(720px, 78%);
  }
  .two-column-grid,
  .donation-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 700px) {
  .container {
    width: calc(100% - 28px);
  }
  .site-announcement .container {
    min-height: 42px;
    justify-content: space-between;
    gap: 14px;
    font-size: 0.66rem;
  }
  .nav-container {
    min-height: 60px;
  }
  .logo {
    font-size: 1.2rem;
  }
  .contribute-hero {
    padding-top: 14px;
  }
  .contribute-hero-panel {
    min-height: 540px;
    padding: 42px 26px 150px;
    align-items: flex-start;
    border-radius: 20px;
    background:
      linear-gradient(150deg, transparent 0 72%, rgba(107, 184, 255, 0.46) 72%),
      linear-gradient(150deg, #fff 0 63%, var(--surface-soft) 63%);
  }
  .contribute-hero-panel::before {
    top: auto;
    right: -140px;
    bottom: -160px;
  }
  .contribute-hero-panel::after {
    top: auto;
    right: -45px;
    bottom: -115px;
  }
  .hero-copy {
    width: 100%;
  }
  .hero-copy h1 {
    font-size: clamp(2.45rem, 12vw, 3.2rem);
  }
  .hero-copy > p:not(.eyebrow) {
    font-size: 0.9rem;
  }
  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }
  .button {
    width: 100%;
  }
  .contribution-strip {
    padding: 18px 0;
  }
  .contribution-strip-grid {
    display: flex;
    padding: 12px 0 18px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .contribution-strip-grid > div {
    min-width: 220px;
    padding: 0 20px;
  }
  .contribution-strip-grid > div:first-child {
    padding-left: 4px;
  }
  .contribute-section {
    padding: 42px 0;
  }
  .feedback-card,
  .wallet-card {
    padding: 21px;
  }
  .wallet-card-heading {
    align-items: stretch;
    flex-direction: column;
  }
  .wallet-card select {
    width: 100%;
  }
  .wallet-address-wrap {
    grid-template-columns: 1fr;
  }
  .other-ways-grid {
    grid-template-columns: 1fr;
  }
  .other-ways-grid > a {
    min-height: 0;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-brand {
    grid-column: auto;
  }
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }
}