:root {
  --ink: #0b1c1f;
  --ink-soft: #143033;
  --water: #1f4f55;
  --mist: #dce8e6;
  --paper: #f3f7f6;
  --accent: #e23a2e;
  --accent-deep: #c42f25;
  --sand: #d8c4a0;
  --text: #e8f1f0;
  --text-muted: rgba(232, 241, 240, 0.72);
  --text-dark: #1a2c2e;
  --text-dark-muted: #5a6e70;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Outfit", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text-dark);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(20px, 4vw, 48px);
  background: linear-gradient(180deg, rgba(11, 28, 31, 0.72), transparent);
  color: var(--text);
  mix-blend-mode: normal;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  gap: 22px;
  font-size: 0.92rem;
  font-weight: 500;
}

.nav a {
  opacity: 0.86;
  transition: opacity 0.25s var(--ease);
}

.nav a:hover {
  opacity: 1;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--text);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  animation: hero-drift 18s var(--ease) infinite alternate;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 28, 31, 0.35) 0%, rgba(11, 28, 31, 0.18) 35%, rgba(11, 28, 31, 0.78) 100%),
    linear-gradient(90deg, rgba(11, 28, 31, 0.55) 0%, rgba(11, 28, 31, 0.12) 55%, transparent 100%);
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(720px, 100%);
  padding: clamp(96px, 16vh, 140px) clamp(20px, 5vw, 64px) clamp(56px, 10vh, 96px);
  animation: rise-in 1s var(--ease) both;
}

.hero-brand {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.04em;
}

.hero-lead {
  margin: 22px 0 0;
  max-width: 32rem;
  color: var(--text-muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

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

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

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.38);
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.7);
}

.download .btn-ghost {
  border-color: rgba(26, 44, 46, 0.18);
  color: var(--text-dark);
  background: transparent;
}

.section {
  padding: clamp(72px, 12vh, 120px) clamp(20px, 5vw, 64px);
}

.section-inner {
  width: min(1080px, 100%);
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--water);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.25;
  color: var(--ink);
}

.section-lead {
  margin: 18px 0 0;
  max-width: 38rem;
  color: var(--text-dark-muted);
  font-size: 1.05rem;
}

.about {
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(31, 79, 85, 0.12), transparent 55%),
    var(--paper);
}

.pillars {
  padding-top: 0;
  background: var(--paper);
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px 36px;
  border-top: 1px solid rgba(20, 48, 51, 0.12);
  padding-top: 40px;
}

.pillar h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--ink);
}

.pillar p {
  margin: 0;
  color: var(--text-dark-muted);
}

.flow {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-soft) 100%);
  color: var(--text);
}

.flow .eyebrow {
  color: var(--sand);
}

.flow h2 {
  color: var(--text);
}

.steps {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.steps li {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-top: 1px solid rgba(232, 241, 240, 0.14);
}

.steps li:last-child {
  border-bottom: 1px solid rgba(232, 241, 240, 0.14);
}

.step-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--sand);
  letter-spacing: 0.06em;
}

.steps h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.steps p {
  margin: 0;
  color: var(--text-muted);
}

.download {
  background:
    linear-gradient(135deg, rgba(226, 58, 46, 0.06), transparent 40%),
    var(--paper);
}

.download-panel {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.store-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.download-note {
  margin: 16px 0 0;
  color: var(--text-dark-muted);
  font-size: 0.88rem;
}

.download-mark {
  justify-self: end;
  width: min(220px, 100%);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 36px;
  background:
    radial-gradient(circle at 30% 25%, rgba(216, 196, 160, 0.35), transparent 50%),
    linear-gradient(160deg, #1f4f55, #0b1c1f);
  animation: mark-float 5s var(--ease) infinite alternate;
}

.download-mark img {
  width: 58%;
  height: auto;
  border-radius: 24px;
}

.footer {
  background: var(--ink);
  color: var(--text-muted);
  padding: 28px clamp(20px, 5vw, 64px);
}

.footer-inner {
  width: min(1080px, 100%);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-family: var(--font-display);
}

.footer-brand img {
  border-radius: 8px;
}

.footer-copy {
  margin: 0;
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  gap: 18px;
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: var(--text);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

.legal-page {
  min-height: 100svh;
  background: var(--paper);
  color: var(--text-dark);
}

.legal-wrap {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 96px 20px 64px;
}

.legal-wrap h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin: 0 0 8px;
}

.legal-wrap .meta {
  color: var(--text-dark-muted);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.legal-wrap h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 28px 0 10px;
}

.legal-wrap p {
  color: var(--text-dark-muted);
}

@keyframes hero-drift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.1) translate3d(-1.5%, -1%, 0); }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes mark-float {
  from { transform: translateY(0); }
  to { transform: translateY(-10px); }
}

@media (max-width: 860px) {
  .nav {
    display: none;
  }

  .pillars-grid,
  .download-panel {
    grid-template-columns: 1fr;
  }

  .download-mark {
    justify-self: start;
    width: 160px;
  }

  .steps li {
    grid-template-columns: 64px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-media img,
  .download-mark,
  .hero-copy {
    animation: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}