:root {
  --ink: #12151c;
  --ink-soft: #1c2230;
  --fog: #e8edf5;
  --muted: #9aa6b8;
  --accent: #ff9500;
  --accent-deep: #e07b00;
  --line: rgba(232, 237, 245, 0.12);
  --font-display: "ZCOOL XiaoWei", "Songti SC", serif;
  --font-body: "Outfit", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  background: var(--ink);
  position: relative;
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 55% at 15% -10%, rgba(255, 149, 0, 0.22), transparent 55%),
    radial-gradient(ellipse 60% 45% at 90% 20%, rgba(90, 140, 255, 0.12), transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 100%, rgba(255, 149, 0, 0.08), transparent 45%),
    linear-gradient(165deg, #0e1118 0%, #171c28 48%, #10141c 100%);
  animation: drift 18s ease-in-out infinite alternate;
}

@keyframes drift {
  from {
    filter: hue-rotate(0deg) saturate(1);
    transform: scale(1);
  }
  to {
    filter: hue-rotate(8deg) saturate(1.05);
    transform: scale(1.03);
  }
}

.top {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  animation: rise 0.7s ease both;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-mark img {
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

nav {
  display: flex;
  gap: 20px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.hero {
  padding: 12vh 0 10vh;
  max-width: 720px;
  animation: rise 0.85s 0.08s ease both;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 5.2rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: 0.04em;
}

.lead {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 36em;
}

.cta-row {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: rise 0.9s 0.18s ease both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: #1a1208;
}

.btn-primary[aria-disabled="true"] {
  opacity: 0.85;
  cursor: pointer;
}

.btn-primary:not(:disabled):hover {
  background: var(--accent-deep);
}

.btn-ghost {
  background: transparent;
  color: var(--fog);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: rgba(232, 237, 245, 0.35);
}

.hint {
  margin-top: 14px;
  color: var(--accent);
  font-size: 0.95rem;
}

section {
  padding: 64px 0 0;
  border-top: 1px solid var(--line);
  margin-top: 24px;
}

section h2 {
  margin: 0 0 28px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 400;
  letter-spacing: 0.03em;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

.feature-list li {
  display: grid;
  gap: 6px;
  max-width: 40em;
}

.feature-list strong {
  font-size: 1.1rem;
}

.feature-list span {
  color: var(--muted);
}

.get-grid {
  display: grid;
  gap: 28px;
}

@media (min-width: 720px) {
  .get-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

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

.get-grid article h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.get-grid article p {
  margin: 0;
  color: var(--muted);
}

.tag {
  margin-top: 14px !important;
  color: var(--accent) !important;
  font-size: 0.9rem;
  font-weight: 600;
}

.contact p {
  margin: 0 0 10px;
}

.copy-id {
  margin-left: 4px;
  padding: 4px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--ink-soft);
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.copy-id:hover {
  border-color: rgba(255, 149, 0, 0.45);
}

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

footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 24px 56px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}

footer p {
  margin: 0 0 6px;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .top {
    flex-direction: column;
    align-items: flex-start;
  }

  nav {
    gap: 16px;
  }

  .hero {
    padding-top: 8vh;
  }
}