:root {
  --ink: #0e1f1c;
  --ink-soft: #3a524c;
  --paper: #f2f6f3;
  --mist: #e5eee9;
  --teal: #0f6b5c;
  --teal-deep: #0a433a;
  --lime: #c8f06c;
  --amber: #e8a23a;
  --line: rgba(14, 31, 28, 0.14);
  --font-brand: "Syne", sans-serif;
  --font-body: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --max: 72rem;
  --pad: clamp(1.25rem, 4.5vw, 2.75rem);
}

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

html {
  scroll-behavior: smooth;
  /* 给固定顶栏留空，锚点滚动时标题不被挡住 */
  scroll-padding-top: 5.75rem;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: #fff;
}

.skip-link:focus {
  left: 0.75rem;
  top: 0.75rem;
}

.topbar {
  position: fixed;
  inset: 0.75rem var(--pad) auto;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: calc(var(--max) + 0.5rem);
  margin: 0 auto;
  padding: 0.65rem 0.85rem 0.65rem 1rem;
  border: 1px solid rgba(14, 31, 28, 0.1);
  border-radius: 0.85rem;
  background: rgba(247, 251, 248, 0.82);
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 28px rgba(14, 31, 28, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand-logo {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  display: block;
  flex-shrink: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem;
  border-radius: 0.5rem;
  background: rgba(14, 31, 28, 0.05);
  border: 1px solid rgba(14, 31, 28, 0.08);
}

.lang-switch button {
  min-width: 2rem;
  min-height: 1.85rem;
  padding: 0.2rem 0.55rem;
  border: 0;
  border-radius: 0.35rem;
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.lang-switch button.is-active {
  background: #fff;
  color: var(--ink);
}

.lang-switch button:hover {
  color: var(--ink);
}

.topnav {
  display: none;
  align-items: center;
  gap: 0.15rem;
  padding: 0.2rem;
  border-radius: 0.55rem;
  background: rgba(14, 31, 28, 0.04);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .topnav {
    display: flex;
  }
}

.topnav a {
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 0.4rem;
  transition: background-color 160ms ease, color 160ms ease;
}

.topnav a:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.9);
}

.topbar-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.2rem;
  padding: 0.4rem 0.9rem;
  border-radius: 0.45rem;
  background: var(--ink);
  color: var(--lime);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, background-color 160ms ease;
}

.topbar-cta:hover {
  transform: translateY(-1px);
  background: var(--teal-deep);
  color: #fff;
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #d9e8e1;
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14, 31, 28, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 31, 28, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 20%, transparent 75%);
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  pointer-events: none;
  mix-blend-mode: multiply;
  animation: drift 16s ease-in-out infinite;
}

.hero-orb-a {
  width: min(70vw, 560px);
  height: min(70vw, 560px);
  left: -10%;
  top: -15%;
  background: radial-gradient(circle, rgba(15, 107, 92, 0.35), transparent 68%);
}

.hero-orb-b {
  width: min(65vw, 520px);
  height: min(55vw, 460px);
  right: -8%;
  bottom: 10%;
  background: radial-gradient(circle, rgba(232, 162, 58, 0.32), transparent 70%);
  animation-delay: -7s;
  animation-duration: 20s;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      100deg,
      rgba(242, 246, 243, 0.88) 0%,
      rgba(242, 246, 243, 0.55) 38%,
      rgba(242, 246, 243, 0.12) 68%,
      transparent 100%
    ),
    linear-gradient(
      180deg,
      transparent 0%,
      transparent 48%,
      rgba(242, 246, 243, 0.75) 78%,
      rgba(242, 246, 243, 0.96) 100%
    );
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: clamp(6rem, 12vh, 7.5rem) var(--pad) clamp(2.75rem, 7vh, 4.5rem);
}

.brand-mark {
  margin: 0 0 0.35rem;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: clamp(3.6rem, 13vw, 7.5rem);
  line-height: 0.9;
  letter-spacing: -0.045em;
}

.brand-mark-accent {
  color: var(--teal);
  background: linear-gradient(120deg, var(--teal) 0%, #178f7a 45%, var(--amber) 140%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero h1 {
  margin: 0.35rem 0 1rem;
  max-width: 12ch;
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.8vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0;
  max-width: 34rem;
  font-size: clamp(1.02rem, 2vw, 1.18rem);
  color: var(--ink-soft);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  margin: 1rem 0 0;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(15, 107, 92, 0.22);
  background: rgba(15, 107, 92, 0.08);
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.75rem 1.35rem;
  border: 1px solid transparent;
  border-radius: 0.4rem;
  font-size: 0.96rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 180ms ease, background-color 180ms ease,
    border-color 180ms ease, color 180ms ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--ink);
  color: var(--lime);
}

.btn-primary:hover {
  background: var(--teal-deep);
  color: #fff;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.62);
  border-color: rgba(14, 31, 28, 0.18);
  color: var(--ink-soft);
}

.btn-ghost[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.7;
}

.btn-ghost[aria-disabled="true"]:hover {
  transform: none;
}

/* —— Sections —— */
.section {
  padding: clamp(4rem, 10vw, 6.5rem) var(--pad);
  background:
    radial-gradient(90% 60% at 0% 0%, rgba(15, 107, 92, 0.06), transparent 55%),
    var(--paper);
}

.section#how {
  padding-bottom: clamp(2.5rem, 6vw, 3.5rem);
}

.section.beta {
  background:
    radial-gradient(80% 50% at 0% 100%, rgba(232, 162, 58, 0.1), transparent 55%),
    radial-gradient(70% 55% at 100% 0%, rgba(15, 107, 92, 0.07), transparent 55%),
    var(--paper);
}

.beta-steps {
  margin: 1.5rem 0 0;
  padding-left: 1.25rem;
  max-width: 40rem;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.7;
}

.beta-steps li {
  margin: 0.35rem 0;
}

.beta-grid {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

@media (min-width: 780px) {
  .beta-grid {
    grid-template-columns: 1.35fr auto;
    gap: 2.5rem;
  }
}

.beta-channels {
  display: grid;
  gap: 0.85rem;
}

.beta-channel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0.95rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.55);
}

.beta-channel-meta {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.beta-channel-label {
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.beta-id-input {
  display: block;
  width: min(100%, 16rem);
  margin: 0;
  padding: 0.2rem 0.35rem;
  border: 1px dashed var(--line);
  border-radius: 0.35rem;
  background: rgba(255, 255, 255, 0.85);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.05rem;
  color: var(--ink);
  cursor: pointer;
}

.beta-id-input:focus {
  outline: 2px solid rgba(15, 107, 92, 0.35);
  outline-offset: 1px;
  border-style: solid;
}

.btn-compact {
  min-height: 2.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.btn.is-copied {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}

.btn.is-copy-fail {
  border-color: var(--amber);
  color: var(--ink);
}

.beta-hint {
  margin: 0.25rem 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.beta-qr-card {
  margin: 0;
  padding: 1rem 1.1rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.6);
  text-align: center;
  max-width: 13.5rem;
}

.beta-qr-card.is-missing {
  display: none;
}

.beta-qr {
  display: block;
  width: 10rem;
  height: 10rem;
  margin: 0 auto;
  object-fit: contain;
  background: #fff;
}

.beta-qr-card figcaption {
  margin-top: 0.65rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.45;
}

.about-beta-link {
  margin: 1rem 0 0;
  font-size: 0.95rem;
}

.about-beta-link a {
  color: var(--teal);
  text-decoration: none;
  font-weight: 600;
}

.about-beta-link a:hover {
  text-decoration: underline;
}

.section.about {
  background:
    radial-gradient(70% 55% at 100% 0%, rgba(15, 107, 92, 0.07), transparent 55%),
    var(--mist);
}

.about-grid {
  display: grid;
  gap: 1.75rem;
  align-items: center;
}

@media (min-width: 720px) {
  .about-grid {
    grid-template-columns: auto 1fr;
    gap: 2.5rem;
  }
}

.about-logo {
  width: clamp(7rem, 18vw, 8.75rem);
  height: clamp(7rem, 18vw, 8.75rem);
  border-radius: 50%;
  display: block;
  justify-self: start;
}

.about-copy h2 {
  margin-bottom: 0.85rem;
}

.about-note {
  margin: 1rem 0 0;
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.about-panels {
  margin-top: clamp(2rem, 5vw, 2.75rem);
  display: grid;
  gap: 1.75rem;
  border-top: 1px solid var(--line);
  padding-top: clamp(1.75rem, 4vw, 2.25rem);
}

@media (min-width: 860px) {
  .about-panels {
    grid-template-columns: 1fr 1.15fr;
    gap: 2.5rem;
  }
}

.about-panel h3 {
  margin: 0 0 1rem;
  font-family: var(--font-brand);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.contact-list,
.member-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.98rem;
}

.contact-list li:last-child {
  border-bottom: 0;
}

.contact-list span:first-child {
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 600;
}

.contact-list a {
  color: var(--ink);
  text-decoration: none;
  word-break: break-all;
}

.contact-list a:hover {
  color: var(--teal);
  text-decoration: underline;
}

.member-list li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.member-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.member-list strong {
  display: block;
  font-size: 1rem;
}

.member-list span {
  display: block;
  margin-top: 0.2rem;
  color: var(--teal);
  font-size: 0.88rem;
  font-weight: 600;
}

.member-list p {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.section-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
}

.section-inner.narrow {
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
}

.eyebrow.light {
  color: var(--lime);
}

.section-head h2,
.section h2,
.band h2,
.status h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-brand);
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.section-lede {
  margin: 0;
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.feature-list {
  list-style: none;
  margin: 2.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

@media (min-width: 860px) {
  .feature-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-list li {
  padding: 1.6rem 0 1.4rem;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 860px) {
  .feature-list li {
    padding: 1.75rem 1.4rem 1.5rem 0;
    border-bottom: none;
    border-right: 1px solid var(--line);
  }

  .feature-list li:last-child {
    border-right: none;
    padding-right: 0;
  }

  .feature-list li:not(:first-child) {
    padding-left: 1.4rem;
  }
}

.feature-index {
  display: block;
  margin-bottom: 1.1rem;
  font-family: var(--font-brand);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--teal);
  line-height: 1;
}

.feature-list h3 {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
}

.feature-list p {
  margin: 0;
  color: var(--ink-soft);
}

/* —— Local-first band —— */
.band {
  position: relative;
  margin: 0 var(--pad) clamp(3rem, 8vw, 4.5rem);
  padding: clamp(2.25rem, 5vw, 3.25rem);
  color: #e7f3ee;
  border-radius: 1.25rem;
  background:
    radial-gradient(80% 80% at 90% 10%, rgba(200, 240, 108, 0.14), transparent 45%),
    radial-gradient(70% 70% at 10% 90%, rgba(232, 162, 58, 0.12), transparent 50%),
    linear-gradient(145deg, #0c322c 0%, #0f4a40 48%, #163c34 100%);
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(12, 50, 44, 0.16);
}

.band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.035) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.45;
  pointer-events: none;
}

.band-inner {
  position: relative;
  width: min(100%, var(--max));
  margin: 0 auto;
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: start;
}

@media (min-width: 860px) {
  .band-inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2.75rem;
  }
}

.band-copy h2 {
  margin-bottom: 0.85rem;
}

.band-lede {
  margin: 0;
  max-width: 34rem;
  color: rgba(231, 243, 238, 0.82);
  font-size: 1.02rem;
}

.flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.flow li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(231, 243, 238, 0.14);
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.04);
}

.flow-index {
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--lime);
  letter-spacing: -0.03em;
}

.flow strong {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 1rem;
}

.flow p {
  margin: 0;
  color: rgba(231, 243, 238, 0.72);
  font-size: 0.92rem;
}

.boundary-text {
  margin: 0;
  font-size: 1.08rem;
  color: var(--ink-soft);
}

.boundary-text strong {
  color: var(--ink);
}

.status {
  padding: 0 var(--pad) clamp(4rem, 10vw, 6rem);
}

.status-inner {
  width: min(100%, 42rem);
  margin: 0 auto;
  padding: 1.75rem 1.5rem;
  border-left: 3px solid var(--amber);
  background: linear-gradient(
    90deg,
    rgba(232, 162, 58, 0.1),
    rgba(232, 162, 58, 0.02) 55%,
    transparent
  );
}

.status-note {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.status-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.15rem;
}

.dl-os-actions {
  margin-top: 1.35rem;
}

.dl-os-actions .btn {
  min-width: 7.5rem;
  justify-content: center;
}

.dl-steps {
  margin: 1.25rem 0 0;
  padding-left: 1.25rem;
  color: rgba(242, 246, 243, 0.92);
  font-size: 0.98rem;
  line-height: 1.7;
}

.dl-steps li {
  margin: 0.25rem 0;
}

.status-note code {
  font-size: 0.88em;
  padding: 0.1em 0.35em;
  border-radius: 0.25rem;
  background: rgba(255, 255, 255, 0.08);
}

.site-footer {
  padding: clamp(2.5rem, 6vw, 3.5rem) var(--pad) 2rem;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, #e7efea 0%, #e0eae5 100%);
}

.footer-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: grid;
  gap: 2rem;
}

@media (min-width: 760px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr;
    gap: 3rem;
    align-items: start;
  }
}

.footer-brand {
  margin: 0 0 0.2rem;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: 1.35rem;
}

.footer-byline {
  margin: 0 0 0.65rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.footer-tagline {
  margin: 0;
  max-width: 28rem;
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.6;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.footer-label {
  margin: 0 0 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.footer-cols a,
.footer-cols span {
  display: block;
  margin: 0 0 0.45rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
  text-decoration: none;
}

.footer-cols a:hover {
  color: var(--ink);
}

.footer-bottom {
  width: min(100%, var(--max));
  margin: 1.75rem auto 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.25rem;
  justify-content: space-between;
  align-items: baseline;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.footer-bottom p {
  margin: 0;
}

.footer-meta a:hover {
  color: var(--teal);
}

.footer-meta .sep {
  margin: 0 0.4rem;
}

/* —— Back to top：固定在视口右下角，不跟页脚文字排在一行 —— */
.back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.5rem;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  width: auto;
  min-width: 2.75rem;
  min-height: 2.75rem;
  margin: 0;
  padding: 0.55rem 0.9rem;
  border: 1px solid rgba(14, 31, 28, 0.14);
  border-radius: 0.55rem;
  background: rgba(247, 251, 248, 0.95);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(14, 31, 28, 0.14);
  backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease, background-color 160ms ease,
    bottom 160ms ease;
}

.back-top.is-visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.back-top:hover {
  background: var(--ink);
  color: var(--lime);
}

.back-top-text {
  letter-spacing: 0.04em;
}

@media (max-width: 520px) {
  .back-top-text {
    display: none;
  }

  .back-top {
    right: 1rem;
    min-width: 2.75rem;
    padding-inline: 0.75rem;
  }
}

/* —— Motion —— */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 800ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 800ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(3%, 4%, 0) scale(1.06);
  }
}

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

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-orb,
  .btn {
    animation: none;
    transition: none;
  }
}