:root {
  color-scheme: dark;
  --ink: #f8fbff;
  --muted: rgba(248, 251, 255, 0.72);
  --dim: rgba(248, 251, 255, 0.48);
  --line: rgba(255, 255, 255, 0.18);
  --panel: rgba(5, 14, 22, 0.72);
  --deep: #061018;
  --sea: #00a4d7;
  --cyan: #71e9ff;
  --gold: #f2c56b;
  --coral: #ff7a4d;
  --leaf: #71d482;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
  font-family:
    Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--deep);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(0, 40, 62, 0.24), transparent 36rem),
    radial-gradient(circle at 20% 20%, rgba(0, 164, 215, 0.18), transparent 34rem),
    #061018;
  overflow-x: hidden;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

#sea-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.65;
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 76px;
  padding: 0 4vw;
  background: rgba(3, 10, 16, 0.42);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.08);
  font-size: 1.45rem;
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.1;
}

.brand strong {
  font-size: 1rem;
}

.brand small {
  margin-top: 0.25rem;
  color: var(--dim);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.site-nav nav {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 2rem);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-nav nav a {
  position: relative;
  padding: 0.35rem 0;
}

.site-nav nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.28s ease;
}

.site-nav nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

main,
.site-footer {
  position: relative;
  z-index: 1;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: 9rem 4vw 5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -3;
  background-image:
    linear-gradient(90deg, rgba(3, 10, 16, 0.78), rgba(3, 10, 16, 0.18) 48%, rgba(3, 10, 16, 0.42)),
    linear-gradient(180deg, rgba(3, 10, 16, 0.18), #061018 96%),
    url("assets/post.png");
  background-position: center;
  background-size: cover;
  transform: scale(1.02);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

.hero-scan {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(90deg, rgba(0, 0, 0, 0.78), transparent 70%);
  animation: gridMove 16s linear infinite;
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 26vh;
  background: linear-gradient(180deg, transparent, #061018);
  pointer-events: none;
}

.hero-content {
  max-width: 820px;
  padding-bottom: 3rem;
}

.eyebrow,
.section-kicker {
  margin: 0 0 1rem;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.2rem, 8.4vw, 8.8rem);
  line-height: 0.92;
  font-weight: 950;
  letter-spacing: 0;
  text-wrap: balance;
}

.hero-copy {
  max-width: 660px;
  margin: 1.4rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.45vw, 1.25rem);
  line-height: 1.8;
}

.hero-actions,
.join-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 1.35rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.08);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  overflow: hidden;
  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    background 0.25s ease;
}

.button::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 0 28%, rgba(255, 255, 255, 0.42), transparent 72%);
  transform: translateX(-120%);
  transition: transform 0.55s ease;
}

.button:hover {
  transform: translateY(-2px);
  border-color: rgba(113, 233, 255, 0.75);
}

.button:hover::before {
  transform: translateX(120%);
}

.button.primary {
  border-color: rgba(113, 233, 255, 0.8);
  background: #dff9ff;
  color: #061018;
}

.button[aria-disabled="true"] {
  cursor: default;
  opacity: 0.78;
}

.button.ghost {
  backdrop-filter: blur(12px);
}

.hero-panel {
  position: absolute;
  right: 4vw;
  bottom: 5.4rem;
  width: min(360px, 34vw);
  padding: 1.1rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(4, 13, 19, 0.58);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-panel p,
.hero-panel span {
  margin: 0;
  color: var(--dim);
  font-size: 0.8rem;
}

.hero-panel strong {
  display: block;
  margin: 0.2rem 0 0.55rem;
  font-size: clamp(1.3rem, 2vw, 2rem);
}

.scroll-cue {
  position: absolute;
  left: 4vw;
  bottom: 2rem;
  width: 1px;
  height: 76px;
  background: rgba(255, 255, 255, 0.2);
}

.scroll-cue span {
  display: block;
  width: 1px;
  height: 24px;
  background: var(--cyan);
  animation: scrollCue 1.6s ease-in-out infinite;
}

.section {
  position: relative;
  padding: clamp(5rem, 9vw, 9rem) 4vw;
}

.intro-grid,
.join-inner,
.section-heading,
.timeline {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.intro h2,
.section-heading h2,
.poster-copy h2,
.join h2 {
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 5.8rem);
  line-height: 1;
  letter-spacing: 0;
  text-wrap: balance;
}

.intro p,
.poster-copy p,
.join p {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.9;
}

.stats {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
  box-shadow: var(--shadow);
}

.stats div,
.join-grid div,
.feature,
.timeline li {
  background: rgba(7, 21, 31, 0.72);
  backdrop-filter: blur(16px);
}

.stats div {
  padding: 1.35rem;
}

.stats strong,
.join-grid strong {
  display: block;
  font-size: 1.5rem;
}

.stats span,
.join-grid span,
.timeline span {
  color: var(--dim);
  font-size: 0.86rem;
}

.section-heading {
  margin-bottom: 2rem;
}

.section-heading.narrow {
  max-width: 860px;
}

.feature-rail {
  width: min(1280px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
}

.feature {
  position: relative;
  min-height: 380px;
  padding: 1.5rem;
  overflow: hidden;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  transition:
    transform 0.35s ease,
    background 0.35s ease;
}

.feature:last-child {
  border-right: 0;
}

.feature::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.feature.active,
.feature:hover {
  background: rgba(10, 38, 52, 0.88);
  transform: translateY(-8px);
}

.feature.active::before,
.feature:hover::before {
  transform: scaleX(1);
}

.feature span {
  color: var(--gold);
  font-size: 0.82rem;
  font-weight: 900;
}

.feature h3 {
  margin: 5rem 0 1rem;
  font-size: clamp(1.35rem, 2.1vw, 2.2rem);
  line-height: 1.05;
}

.feature p,
.timeline p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.timeline {
  display: grid;
  gap: 1px;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 160px minmax(0, 0.85fr) minmax(0, 1.2fr);
  gap: 1.5rem;
  padding: 1.4rem;
  align-items: center;
}

.timeline h3 {
  margin: 0;
  font-size: clamp(1.15rem, 1.8vw, 1.8rem);
}

.poster-section {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.poster-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.poster-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  pointer-events: none;
}

.poster-frame img {
  display: block;
  width: 100%;
  aspect-ratio: 1672 / 941;
  object-fit: cover;
  transform: scale(1.01);
}

.join {
  padding-bottom: 6rem;
}

.join-inner {
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px solid rgba(255, 255, 255, 0.18);
  background:
    linear-gradient(120deg, rgba(0, 164, 215, 0.2), rgba(255, 122, 77, 0.12)),
    rgba(6, 16, 24, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.join-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.join-grid div {
  min-height: 128px;
  padding: 1.2rem;
}

.join-grid strong {
  margin-top: 0.9rem;
  font-size: clamp(1rem, 1.8vw, 1.55rem);
  line-height: 1.25;
}

.fine-print {
  margin-bottom: 0;
  color: var(--dim);
  font-size: 0.88rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 4vw;
  color: var(--dim);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.8s ease,
    transform 0.8s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes heroDrift {
  from {
    transform: scale(1.02) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.07) translate3d(-1.5%, -1%, 0);
  }
}

@keyframes gridMove {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 128px 64px;
  }
}

@keyframes scrollCue {
  0% {
    transform: translateY(0);
    opacity: 0;
  }
  35% {
    opacity: 1;
  }
  100% {
    transform: translateY(52px);
    opacity: 0;
  }
}

@media (max-width: 980px) {
  .site-nav {
    height: 68px;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: 940px;
    padding-top: 7rem;
  }

  .hero-content {
    padding-bottom: 12rem;
  }

  .hero-panel {
    left: 4vw;
    right: auto;
    width: min(480px, 92vw);
  }

  .intro-grid,
  .poster-section {
    grid-template-columns: 1fr;
  }

  .feature-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature {
    min-height: 300px;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

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

@media (max-width: 620px) {
  .site-nav {
    padding: 0 1rem;
  }

  .site-nav nav {
    gap: 0.8rem;
    font-size: 0.82rem;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand strong {
    font-size: 0.88rem;
  }

  .hero {
    min-height: 860px;
    padding: 6rem 1rem 4rem;
  }

  .hero h1 {
    font-size: clamp(2.8rem, 17vw, 5.2rem);
  }

  .hero-bg {
    background-position: 58% center;
  }

  .section {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .feature-rail {
    grid-template-columns: 1fr;
  }

  .feature {
    min-height: auto;
  }

  .feature h3 {
    margin-top: 3rem;
  }

  .site-footer {
    flex-direction: column;
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}