.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--color-border);
  background: rgba(6, 16, 29, 0.86);
  backdrop-filter: blur(18px) saturate(130%);
}

.site-nav {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.brand__mark,
.logo {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border: 1px solid rgba(53, 200, 230, 0.36);
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, rgba(53, 200, 230, 0.2), rgba(138, 124, 244, 0.16));
  box-shadow: 0 0 34px rgba(53, 200, 230, 0.12);
}

.brand__mark::after,
.logo::after {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  content: "";
  background: var(--color-primary);
  box-shadow: 0 0 20px var(--color-primary);
}

.brand__text {
  min-width: 0;
}

.brand__text strong,
.brand h1 {
  display: block;
  margin: 0;
  font-size: 0.98rem;
  font-weight: 850;
  letter-spacing: -0.01em;
}

.brand__text span,
.brand p {
  display: block;
  margin: 2px 0 0;
  overflow: hidden;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-nav__links,
.navlinks {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  color: var(--color-text-soft);
  font-size: 0.86rem;
  font-weight: 700;
}

.site-nav__links > a:not(.btn):hover,
.navlinks > a:not(.btn):hover {
  color: var(--color-text);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  padding-block: clamp(64px, 9vw, 120px) 64px;
}

.hero__copy {
  max-width: 760px;
}

.hero h1,
.hero h2 {
  max-width: 900px;
  margin-block: var(--space-5);
  font-size: clamp(2.75rem, 6vw, 5.8rem);
  letter-spacing: -0.065em;
  line-height: 0.98;
}

.hero__lead,
.hero > div > p {
  max-width: 720px;
  color: var(--color-text-soft);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.hero__principles,
.labcard {
  padding: clamp(24px, 3vw, 36px);
  box-shadow: var(--shadow-md);
}

.hero__principles h2,
.hero__principles h3 {
  margin-bottom: var(--space-4);
  font-size: clamp(1.4rem, 2vw, 2rem);
}

.hero__principles p {
  color: var(--color-text-soft);
}

.equation-strip {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding: var(--space-4);
  color: #dce8f7;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(2, 9, 17, 0.6);
}

.section {
  padding-block: clamp(48px, 7vw, 88px);
}

.section-heading,
.section-title {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 520px);
  gap: var(--space-7);
  align-items: end;
  margin-bottom: var(--space-7);
}

.section-heading p,
.section-title p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.72;
}

.module-grid,
.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
}

.module-card,
.card {
  min-width: 0;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(18, 35, 57, 0.96), rgba(8, 20, 34, 0.98));
  box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.module-card:hover,
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 200, 230, 0.38);
  box-shadow: var(--shadow-md);
}

.module-card__preview,
.thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #040b13;
}

.module-card__preview img,
.module-card__preview canvas,
.thumb img,
.thumb canvas {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.module-card .tag,
.card .tag {
  align-self: flex-start;
  margin-top: var(--space-4);
  padding: 6px 9px;
  border: 1px solid rgba(53, 200, 230, 0.28);
  border-radius: 999px;
  background: rgba(53, 200, 230, 0.08);
}

.module-card h3,
.card h3 {
  margin-block: var(--space-4) var(--space-2);
  font-size: 1.25rem;
}

.module-card p,
.card p {
  flex: 1;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.module-card .btn,
.card .btn {
  width: 100%;
  margin-top: var(--space-3);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.content-card,
.question-card {
  padding: var(--space-6);
}

.content-card p,
.question-card p,
.question-card li {
  color: var(--color-text-soft);
  line-height: 1.7;
}

.question-stack {
  display: grid;
  gap: var(--space-4);
}

.donation-panel,
.donation {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-7);
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid rgba(53, 200, 230, 0.26);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 0% 0%, rgba(53, 200, 230, 0.16), transparent 36%),
    linear-gradient(135deg, rgba(18, 35, 57, 0.96), rgba(11, 24, 42, 0.96));
  box-shadow: var(--shadow-md);
}

.site-footer,
.footer {
  padding-block: var(--space-7);
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  font-size: 0.84rem;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  place-items: center;
  padding: var(--space-5);
  background: rgba(2, 7, 13, 0.78);
  backdrop-filter: blur(10px);
}

.modal.open {
  display: grid;
}

.modal-box {
  width: min(720px, 100%);
  max-height: min(820px, calc(100vh - 40px));
  overflow: auto;
  padding: var(--space-7);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  background: var(--color-bg-elevated);
  box-shadow: var(--shadow-lg);
}

.modal__qr {
  width: min(220px, 100%);
  display: block;
  margin-block: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

@media (max-width: 1100px) {
  .module-grid,
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .site-nav {
    align-items: flex-start;
    flex-direction: column;
    padding-block: var(--space-3);
  }

  .site-nav__links,
  .navlinks {
    width: 100%;
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .hero,
  .section-heading,
  .section-title,
  .donation-panel,
  .donation {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 580px) {
  .module-grid,
  .grid {
    grid-template-columns: 1fr;
  }

  .hero h1,
  .hero h2 {
    font-size: clamp(2.45rem, 15vw, 4.2rem);
  }
}

.meta-line {
  color: var(--color-muted);
  font-size: 0.86rem;
}

.process-list {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}

.process-list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 2px var(--space-3);
  align-items: center;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(3, 11, 20, 0.48);
}

.process-list li > span {
  grid-row: 1 / 3;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.process-list small {
  color: var(--color-muted);
}

.module-card__subtitle {
  flex: 0 0 auto !important;
  margin-bottom: var(--space-3);
  color: var(--color-text-soft) !important;
  font-weight: 760;
}

.section--muted {
  border-block: 1px solid var(--color-border);
  background: rgba(2, 9, 17, 0.34);
}

.content-card__number {
  display: block;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.content-card h3,
.question-card h3 {
  margin-bottom: var(--space-3);
}

.answer-list {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-5) 0;
  padding-left: 1.6rem;
}

.answer-details {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
}

.answer-details summary {
  width: fit-content;
  cursor: pointer;
  color: var(--color-primary);
  font-weight: 800;
}

.answer-details > div {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(53, 200, 230, 0.06);
}

.donation-panel p {
  margin: var(--space-3) 0 0;
  color: var(--color-text-soft);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-5);
}

.modal-open {
  overflow: hidden;
}

.modal__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.modal__header h2 {
  margin-top: var(--space-3);
}

.icon-button {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-soft);
  background: rgba(255,255,255,.04);
  cursor: pointer;
  font-size: 1.5rem;
}

.icon-button:hover {
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.support-details {
  display: grid;
  gap: var(--space-2);
  margin-block: var(--space-5);
}

.support-details > div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: var(--space-3);
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: rgba(3, 11, 20, .56);
}

.support-details dt {
  color: var(--color-muted);
  font-size: .78rem;
  font-weight: 800;
}

.support-details dd {
  margin: 0;
  overflow-wrap: anywhere;
  font-family: var(--font-mono);
}

#copyStatus:empty {
  display: none;
}

@media (max-width: 700px) {
  .footer-row {
    flex-direction: column;
  }

  .support-details > div {
    grid-template-columns: 1fr;
  }
}