:root {
  --bg: #08090d;
  --surface: #111420;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.15);
  --text: #f4f5f9;
  --text-2: #adb4c4;
  --text-3: #767e90;
  --accent: #7c9cff;
  --teal: #5eead4;
  --violet: #b79cff;
  --gold: #f3c77b;
  --grad: linear-gradient(100deg, #5eead4 0%, #7c9cff 46%, #b79cff 100%);
  --font: "Inter var", "Segoe UI Variable Display", "Segoe UI", -apple-system, BlinkMacSystemFont,
    "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  color-scheme: dark;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(1000px 600px at 50% -14%, rgba(90, 110, 180, 0.16), transparent 62%),
    var(--bg);
}

.bg__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.45;
}

.bg__glow--a {
  width: 50vw;
  height: 42vw;
  left: -14vw;
  top: -18vw;
  background: radial-gradient(circle, rgba(94, 234, 212, 0.35), transparent 66%);
}

.bg__glow--b {
  width: 48vw;
  height: 40vw;
  right: -12vw;
  top: -12vw;
  background: radial-gradient(circle, rgba(124, 156, 255, 0.4), transparent 66%);
}

.bg__glow--c {
  width: 60vw;
  height: 44vw;
  left: 24vw;
  bottom: -36vw;
  background: radial-gradient(circle, rgba(183, 156, 255, 0.22), transparent 70%);
}

.nav {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 620;
}

.brand img {
  width: 28px;
  height: 28px;
  filter: drop-shadow(0 4px 12px rgba(124, 156, 255, 0.4));
}

.nav__links {
  display: flex;
  gap: 22px;
  color: var(--text-3);
  font-size: 13px;
}

.nav__links a:hover,
.nav__links .is-active {
  color: var(--text);
}

main {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.hero {
  padding: 70px 0 40px;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-2);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 22px 0 16px;
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__sub {
  margin: 0 auto;
  max-width: 600px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.9;
}

.hero__actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border-radius: 10px;
  border: 1px solid var(--line-2);
  font-size: 13.5px;
  font-weight: 500;
  transition: transform 0.18s, background 0.18s, border-color 0.18s;
}

.btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn--primary {
  border-color: transparent;
  background: linear-gradient(140deg, #f7f8fb, #dfe5f5);
  color: #0a0c12;
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-2);
}

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

.btn--ghost:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.25);
}

.hero__meta {
  margin-top: 16px;
  color: var(--text-3);
  font-size: 11.5px;
}

.hero__hint {
  max-width: 560px;
  margin: 10px auto 0;
  color: var(--text-3);
  font-size: 11px;
  line-height: 1.8;
}

.shot {
  margin: 26px 0 70px;
}

.window {
  border-radius: 14px;
  border: 1px solid var(--line-2);
  background: #0b0d13;
  box-shadow: 0 50px 120px -60px rgba(0, 0, 0, 0.95);
  overflow: hidden;
}

.window__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 34px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.dot--r {
  background: #ff5f57;
}
.dot--y {
  background: #febc2e;
}
.dot--g {
  background: #28c840;
}

.window__title {
  margin-left: 10px;
  color: var(--text-3);
  font-size: 10.5px;
}

.window img {
  display: block;
  width: 100%;
}

.shot__caption {
  margin-top: 10px;
  color: var(--text-3);
  font-size: 11px;
  text-align: center;
}

.features h2,
.steps h2,
.faq h2 {
  margin: 0 0 22px;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.features {
  margin-bottom: 70px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.card {
  padding: 20px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}

.card__icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line);
  margin-bottom: 12px;
}

.card__icon svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card__icon--teal {
  color: var(--teal);
  background: linear-gradient(145deg, rgba(94, 234, 212, 0.14), transparent 80%);
}

.card__icon--blue {
  color: var(--accent);
  background: linear-gradient(145deg, rgba(124, 156, 255, 0.16), transparent 80%);
}

.card__icon--violet {
  color: var(--violet);
  background: linear-gradient(145deg, rgba(183, 156, 255, 0.16), transparent 80%);
}

.card__icon--gold {
  color: var(--gold);
  background: linear-gradient(145deg, rgba(243, 199, 123, 0.16), transparent 80%);
}

.card h3 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 600;
}

.card p {
  margin: 0;
  color: var(--text-3);
  font-size: 12px;
  line-height: 1.75;
}

.steps {
  margin-bottom: 70px;
}

.steps ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  padding: 18px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.steps li::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
}

.steps strong {
  display: block;
  margin-bottom: 4px;
  font-size: 13.5px;
  font-weight: 550;
}

.steps span {
  color: var(--text-3);
  font-size: 11.5px;
  line-height: 1.7;
}

.faq {
  margin-bottom: 50px;
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 14px 2px;
}

.faq details:last-of-type {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  cursor: pointer;
  color: var(--text-2);
  font-size: 13px;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--text-3);
}

.faq details[open] summary::after {
  content: "−";
}

.faq p {
  margin: 10px 0 0;
  color: var(--text-3);
  font-size: 12px;
  line-height: 1.8;
}

.checksum {
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.checksum p {
  margin: 0 0 6px;
  color: var(--text-3);
  font-size: 10.5px;
}

.checksum code {
  color: var(--text-2);
  font-family: var(--mono);
  font-size: 10.5px;
  word-break: break-all;
}

.foot {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px;
  border-top: 1px solid var(--line);
  color: var(--text-3);
  font-size: 11px;
}

.foot__links {
  display: flex;
  gap: 16px;
}

.foot__links a:hover {
  color: var(--text-2);
}

@media (max-width: 760px) {
  .grid,
  .steps ol {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 46px;
  }

  .nav__links {
    gap: 14px;
  }

  .foot {
    flex-direction: column;
  }
}