*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #000;
  --bg-elevated: #111114;
  --bg-card: rgba(22, 22, 24, 0.72);
  --line: rgba(255, 255, 255, 0.08);
  --text: #f5f5f7;
  --muted: rgba(235, 235, 245, 0.55);
  --accent: #a4d037;
  --accent-dim: rgba(164, 208, 55, 0.14);
  --accent-border: rgba(164, 208, 55, 0.35);
  --blue: #0a84ff;
  --radius: 16px;
  --max: 1120px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Segoe UI", sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(164, 208, 55, 0.08), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(10, 132, 255, 0.06), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

.container {
  width: min(var(--max), calc(100% - 3rem));
  margin: 0 auto;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(0, 0, 0, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo img {
  height: 22px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

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

.nav-cta {
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  color: var(--accent) !important;
  font-weight: 600;
}

.nav-cta:hover {
  background: rgba(164, 208, 55, 0.22);
}

/* Hero */
.hero {
  padding: 5.5rem 0 4rem;
  text-align: center;
}

.hero-kicker {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.02;
  margin-bottom: 1rem;
}

.hero h1 .go {
  color: var(--accent);
}

.hero-lead {
  max-width: 640px;
  margin: 0 auto 2rem;
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 160px;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.2s, background 0.2s, border-color 0.2s;
}

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

.btn-primary {
  background: var(--accent);
  color: #111;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: #b8e04a;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

.platform-badges {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.badge {
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--muted);
}

/* Sections */
.section {
  padding: 4.5rem 0;
}

.section-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-kicker {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.section-desc {
  max-width: 560px;
  margin: 0 auto;
  color: var(--muted);
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.feature-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--line);
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: rgba(164, 208, 55, 0.25);
  transform: translateY(-2px);
}

.feature-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* Workflow */
.workflow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.workflow-panel {
  border-radius: 20px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent), var(--bg-elevated);
  overflow: hidden;
}

.mock-ui {
  padding: 1rem;
}

.mock-bar {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.mock-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
}

.mock-video {
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(164, 208, 55, 0.08), rgba(10, 132, 255, 0.08)),
    #0d0d10;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.mock-video::after {
  content: "";
  position: absolute;
  inset: auto 1rem 1rem 1rem;
  height: 48px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid var(--line);
}

.mock-timeline {
  margin-top: 0.75rem;
  height: 56px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  position: relative;
}

.mock-timeline::before {
  content: "";
  position: absolute;
  left: 18%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
}

.workflow-steps {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.step {
  display: flex;
  gap: 1rem;
}

.step-num {
  flex: 0 0 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

.step h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.step p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* AI presets */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
}

.preset {
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

.preset strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

/* Audience */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.audience-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-card);
}

.audience-card h3 {
  margin-bottom: 0.5rem;
}

.audience-card p {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Download */
.download-box {
  padding: 2rem;
  border-radius: 20px;
  border: 1px solid var(--accent-border);
  background: linear-gradient(135deg, rgba(164, 208, 55, 0.06), rgba(10, 132, 255, 0.04));
  text-align: center;
}

.download-version {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.download-notes {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 1rem 0 1.5rem;
  min-height: 1.4em;
}

/* Activate */
.activate-box {
  max-width: 480px;
  margin: 0 auto;
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-card);
  text-align: center;
}

.activate-box p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.activate-code {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  font-family: ui-monospace, monospace;
  color: var(--accent);
  font-size: 0.9rem;
}

/* FAQ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  overflow: hidden;
}

.faq-item summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  padding: 0 1.25rem 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  margin-top: auto;
  padding: 2.5rem 0 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

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

.footer-links {
  display: flex;
  gap: 1.25rem;
}

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

.footer-beian {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  text-align: center;
}

.footer-beian-line {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: #888;
}

.footer-beian-line a {
  color: #888;
  text-decoration: none;
}

.footer-beian-line a:hover {
  color: #aaa;
  text-decoration: underline;
}

.footer-beian-line--reserved {
  min-height: calc(12px * 1.6);
}

/* Responsive */
@media (max-width: 900px) {
  .feature-grid,
  .audience-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .preset-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-links a:not(.nav-cta) {
    display: none;
  }
}

@media (max-width: 600px) {
  .feature-grid,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3.5rem;
  }
}