:root {
  --brand: #e16b50;
  --brand-deep: #c7533c;
  --brand-soft: #ff8c80;
  --ink: #17201f;
  --muted: #4a5855;
  --line: rgba(23, 32, 31, 0.12);
  --surface: #f3faf8;
  --panel: #ffffff;
  --teal: #2f9b8c;
  --sky: #6eb7d0;
  --sand: #ffe4d8;
  --font-sans: "MiSans", "MiSans VF", system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-display: var(--font-sans);
  --font-body: var(--font-sans);
  --radius: 18px;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 700px at 12% -10%, #ffd2c4 0%, transparent 55%),
    radial-gradient(900px 600px at 92% 8%, #b8ebe0 0%, transparent 50%),
    radial-gradient(800px 500px at 70% 100%, #c9e7f4 0%, transparent 45%),
    linear-gradient(180deg, #f7fffc 0%, #eef6f4 48%, #f8f3ef 100%);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

/* NAV */
.topbar {
  position: absolute;
  inset: 0 0 auto;
  z-index: 20;
  padding: 1.25rem 0;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0;
}

.brand-lockup img {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.65rem;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-link {
  color: var(--muted);
  font-size: 0.95rem;
}

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

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 3rem;
  padding: 0.75rem 1.35rem;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

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

.btn:active {
  transform: translateY(0);
}

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

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

.btn-ghost {
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.85);
}

.btn-lg {
  min-height: 3.4rem;
  padding-inline: 1.6rem;
  font-size: 1.05rem;
}

.btn svg {
  width: 1.15rem;
  height: 1.15rem;
}

/* HERO */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: 7rem 0 3.5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(115deg, rgba(225, 107, 80, 0.22) 0%, transparent 42%),
    linear-gradient(0deg, rgba(243, 250, 248, 0.92) 0%, transparent 38%),
    url("data:image/svg+xml,%3Csvg width='64' height='64' viewBox='0 0 64 64' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='%23e16b50' stroke-opacity='0.08' stroke-width='1'%3E%3Cpath d='M0 32h64M32 0v64'/%3E%3C/g%3E%3C/svg%3E");
  background-size: auto, auto, 64px 64px;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: end;
}

.hero-copy {
  padding-bottom: 21.5rem;
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6.5vw, 4.6rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.hero-title {
  margin: 0 0 0.9rem;
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  font-weight: 700;
  line-height: 1.35;
  max-width: 18ch;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 32ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.hero-meta {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 28rem;
}

.hero-visual::before {
  content: "";
  position: absolute;
  width: min(92%, 460px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(225, 107, 80, 0.38) 0%, rgba(47, 155, 140, 0.16) 48%, transparent 72%);
  filter: blur(8px);
}

.hero-logo {
  position: relative;
  width: min(100%, 420px);
  height: auto;
  border-radius: 2%;
  animation: float-y 5.5s ease-in-out infinite;
  will-change: transform;
}

@keyframes float-y {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

/* SECTIONS */
section {
  padding: 5rem 0;
}

.section-head {
  max-width: 36rem;
  margin-bottom: 2.25rem;
}

.section-head h2 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.2vw, 2.25rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.2;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.platforms {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.42);
  backdrop-filter: blur(10px);
}

.platform-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.platform-list li {
  padding: 0.55rem 0.95rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.platform-list li.is-in {
  opacity: 1;
  transform: translateY(0);
}

.about {
  padding-top: 4rem;
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 3.5rem;
  align-items: start;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--brand);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.about-intro h2 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.6vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.2;
}

.about-lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.12rem;
  line-height: 1.75;
  max-width: 28ch;
}

.about-note {
  margin: 1.5rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 34ch;
}

.about-points {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.about-points li {
  display: grid;
  gap: 0.35rem;
  padding: 1.35rem 0 1.35rem 1.25rem;
  border-left: 3px solid rgba(225, 107, 80, 0.28);
  border-bottom: 1px solid var(--line);
}

.about-points li:first-child {
  border-left-color: var(--brand);
}

.about-points li:last-child {
  border-bottom: 0;
}

.point-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
}

.point-desc {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

.platform-detail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-top: 2.5rem;
}

.platform-block {
  padding-top: 1rem;
  border-top: 2px solid var(--brand);
}

.platform-block h3 {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
}

.platform-block p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.features-grid-wide {
  gap: 1.5rem 1.25rem;
}

.feature {
  padding: 1.25rem 0 1.35rem;
  border-top: 2px solid var(--brand);
  background: transparent;
}

.feature h3 {
  margin: 0 0 0.55rem;
  font-size: 1.1rem;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 3.2rem 0 0;
  border-bottom: 0;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.steps h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
}

.steps p {
  margin: 0;
  color: var(--muted);
  max-width: none;
  font-size: 0.98rem;
  line-height: 1.65;
}

.download {
  position: relative;
}

.download-panel {
  display: grid;
  grid-template-columns: 1.35fr auto;
  gap: 2rem;
  align-items: center;
  padding: 2.4rem 2.6rem;
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(225, 107, 80, 0.14), rgba(47, 155, 140, 0.12)),
    rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.download-panel h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.8vw, 2.1rem);
  font-weight: 700;
  letter-spacing: 0;
}

.download-panel > div > p {
  margin: 0 0 1.35rem;
  color: var(--muted);
  max-width: 40ch;
}

.download-side {
  display: grid;
  gap: 0.65rem;
  justify-items: center;
  text-align: center;
}

.download-side img {
  border-radius: 22%;
}

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

.why-layout {
  max-width: 42rem;
}

.why-layout h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.2vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.2;
}

.why-layout p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.seo-extra {
  padding-top: 1rem;
}

.footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.footer strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin: 0.55rem 0 0;
}

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

/* REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms ease, transform 700ms ease;
}

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

.reveal-delay-1 {
  transition-delay: 80ms;
}

.reveal-delay-2 {
  transition-delay: 160ms;
}

.reveal-delay-3 {
  transition-delay: 240ms;
}

@media (max-width: 900px) {
  .hero {
    padding-top: 6rem;
    align-items: start;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .hero-visual {
    min-height: 18rem;
    order: -1;
  }

  .hero-logo {
    width: min(100%, 260px);
  }

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

  .about-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-lead,
  .about-note {
    max-width: none;
  }

  .platform-detail,
  .steps {
    grid-template-columns: 1fr;
  }

  .download-panel {
    grid-template-columns: 1fr;
    padding: 1.6rem;
  }

  .download-side {
    justify-items: start;
    text-align: left;
  }
}

@media (max-width: 560px) {
  .wrap {
    width: min(100% - 1.5rem, var(--max));
  }

  .nav-link {
    display: none;
  }

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

  .hero-title {
    max-width: none;
  }

  .hero-lead {
    max-width: none;
  }
}

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

  .hero-logo,
  .reveal,
  .platform-list li {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}