:root {
  --bg: #0c1220;
  --bg-elevated: #141c2e;
  --ink: #e8eef7;
  --muted: #9aabbf;
  --accent: #e8a66a;
  --accent-deep: #c47a3a;
  --line: rgba(232, 238, 247, 0.12);
  --phone-frame: #1a2336;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1080px;
  --radius: 18px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(232, 166, 106, 0.16), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(90, 130, 180, 0.18), transparent 50%),
    linear-gradient(180deg, #0a101c 0%, var(--bg) 40%, #0a0f18 100%);
  min-height: 100vh;
  line-height: 1.65;
}

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

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

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(10, 16, 28, 0.72);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: 0.08em;
  font-weight: 400;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.95rem;
  color: var(--muted);
}

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

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  padding: 4.5rem 0 3.5rem;
  overflow: hidden;
}

.hero__grid {
  display: grid;
  gap: 2rem;
  align-items: end;
}

.hero__eyebrow {
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.75rem;
  margin: 0 0 1rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 8vw, 5.5rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  letter-spacing: 0.06em;
  font-weight: 400;
}

.hero__lead {
  max-width: 28rem;
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0 0 2rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border-radius: 999px;
  padding: 0.85rem 1.45rem;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

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

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #1a120a;
  font-weight: 600;
}

.btn--ghost {
  border-color: var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  cursor: not-allowed;
  opacity: 0.7;
}

.btn--ghost:hover {
  transform: none;
}

.hero__meta {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.hero-visual {
  position: absolute;
  inset: auto 0 0 auto;
  width: min(42vw, 420px);
  height: min(42vw, 420px);
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, rgba(232, 166, 106, 0.35), transparent 45%),
    radial-gradient(circle at 70% 60%, rgba(120, 160, 210, 0.25), transparent 50%);
  filter: blur(2px);
  pointer-events: none;
  opacity: 0.85;
  animation: drift 12s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(-18px, -24px) scale(1.06); }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Sections */
.section {
  padding: 4rem 0;
}

.section__head {
  margin-bottom: 2.5rem;
}

.section__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  margin: 0 0 0.6rem;
  font-weight: 400;
  letter-spacing: 0.04em;
}

.section__head p {
  margin: 0;
  color: var(--muted);
  max-width: 36rem;
}

.download-panel {
  display: grid;
  gap: 1.25rem;
  padding: 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(20, 28, 46, 0.65);
}

.download-panel__title {
  margin: 0;
  font-size: 1.15rem;
}

.download-panel__hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.download-panel__version {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* Features */
.feature {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
  padding: 2.5rem 0;
  border-top: 1px solid var(--line);
}

.feature:last-child {
  border-bottom: 1px solid var(--line);
}

.feature--flip {
  grid-template-columns: 0.95fr 1.05fr;
}

.feature--flip .feature__copy {
  order: 2;
}

.feature--flip .feature__visual {
  order: 1;
}

.feature__kicker {
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  margin: 0 0 0.6rem;
}

.feature__copy h3 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2rem);
  margin: 0 0 0.75rem;
  font-weight: 400;
}

.feature__copy p {
  margin: 0;
  color: var(--muted);
  max-width: 28rem;
}

.phone {
  width: min(100%, 260px);
  margin-inline: auto;
  background: var(--phone-frame);
  border-radius: 28px;
  padding: 12px;
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.phone__screen {
  aspect-ratio: 9 / 19.5;
  border-radius: 20px;
  overflow: hidden;
  background:
    linear-gradient(165deg, rgba(232, 166, 106, 0.18), transparent 40%),
    linear-gradient(345deg, #1c2740, #101828 70%);
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.1rem 0.9rem;
}

.phone__screen img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.phone__badge {
  align-self: flex-start;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid rgba(232, 166, 106, 0.35);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  background: rgba(0, 0, 0, 0.25);
}

.phone__mock-title {
  margin-top: auto;
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.25;
}

.phone__mock-sub {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

/* About */
.about-card {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(20, 28, 46, 0.55);
}

.about-card h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 0.4rem;
  font-weight: 400;
}

.about-card .legal-name {
  color: var(--accent);
  margin: 0 0 1.5rem;
}

.about-card p {
  color: var(--muted);
  margin: 0 0 1rem;
}

.placeholder-note {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--accent);
  opacity: 0.85;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.88rem;
}

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

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

@media (max-width: 860px) {
  .feature,
  .feature--flip {
    grid-template-columns: 1fr;
  }

  .feature--flip .feature__copy,
  .feature--flip .feature__visual {
    order: initial;
  }

  .hero-visual {
    width: 280px;
    height: 280px;
    opacity: 0.55;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    right: 1.25rem;
    top: 3.4rem;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.2rem;
    background: var(--bg-elevated);
    border: 1px solid var(--line);
    border-radius: 12px;
  }

  .nav.is-open {
    display: flex;
  }
}