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

:root {
  --bg: #0C0D10;
  --ink: #F2F4F8;
  --dim: #AEB2B9;
  --faint: #7E838C;
  --stroke: rgba(255, 255, 255, 0.12);
  --card: rgba(255, 255, 255, 0.07);
  --input: rgba(255, 255, 255, 0.06);
  --acc: #FFFFFF;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Segoe UI', system-ui, -apple-system, 'Noto Sans', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

.bg { position: fixed; inset: 0; z-index: -1; overflow: hidden; }

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
}
.bg-glow-a {
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 120vw;
  height: 90vh;
  max-width: 1400px;
  background: radial-gradient(closest-side, #474C58 0%, #2A2D36 45%, transparent 100%);
  opacity: 0.5;
}
.bg-glow-b {
  bottom: -30%;
  right: -15%;
  width: 55vw;
  height: 55vw;
  max-width: 620px;
  background: #1B1D24;
  opacity: 0.8;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(75% 55% at 50% 0%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(75% 55% at 50% 0%, #000 30%, transparent 100%);
}

.hero {
  text-align: center;
  padding: clamp(56px, 10vh, 100px) 20px 30px;
  animation: rise 700ms var(--ease) both;
}

.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.26em;
  color: var(--dim);
  padding: 8px 16px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(10px);
  margin-bottom: 20px;
}

.hero-logo {
  display: block;
  width: 116px;
  height: 116px;
  margin: 0 auto 14px;
  filter: drop-shadow(0 14px 34px rgba(255, 255, 255, 0.18));
  animation: rise 700ms var(--ease) both 60ms;
}

.hero-title {
  font-size: clamp(42px, 8.5vw, 70px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
}
.hero-title span {
  background: linear-gradient(180deg, #FFFFFF, #AEB2B9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 22px rgba(255, 255, 255, 0.28));
}

.hero-sub {
  margin-top: 14px;
  font-size: clamp(14px, 2.4vw, 17px);
  line-height: 1.6;
  color: var(--dim);
}

@keyframes rise { from { opacity: 0; transform: translateY(22px); } }

.demo {
  position: relative;
  width: 100%;
  max-width: 480px;
  margin: 30px auto 0;
  border: 1px solid var(--stroke);
  border-radius: 14px;
  background: #101116;
  overflow: hidden;
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.6);
  animation: rise 750ms var(--ease) both 120ms;
}

.demo-bar {
  display: flex;
  align-items: center;
  height: 36px;
  padding-left: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
}
.demo-app {
  font-size: 12px;
  font-weight: 600;
  color: var(--dim);
}
.demo-caps {
  display: flex;
  margin-left: auto;
  height: 100%;
}
.demo-caps span {
  width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #C6C9CE;
}
.demo-caps span:hover { background: rgba(255, 255, 255, 0.13); }
.demo-caps .demo-x:hover { background: #E81123; color: #fff; }

.demo-body {
  padding: 26px 20px 34px;
  font: 600 clamp(16px, 3.6vw, 21px)/1.4 Consolas, 'Cascadia Mono', monospace;
  text-align: left;
  min-height: 96px;
}
#demo-text { transition: color 240ms, text-shadow 240ms; color: var(--ink); }
#demo-text.is-fixed { color: #FFFFFF; text-shadow: 0 0 20px rgba(255, 255, 255, 0.55); }

.caret {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--ink);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.demo-key {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font: 700 11.5px/1 Consolas, monospace;
  letter-spacing: 0.06em;
  color: #0C0D10;
  padding: 9px 14px;
  border-radius: 8px;
  background: #FFFFFF;
  box-shadow: 0 8px 22px rgba(255, 255, 255, 0.22);
  opacity: 0;
  transform: translateY(6px) scale(0.9);
  transition: opacity 220ms, transform 260ms var(--ease);
}
.demo-key.is-on { opacity: 1; transform: translateY(0) scale(1); }
.demo-key.is-press { transform: translateY(2px) scale(0.94); }

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 11px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 13px 22px;
  border-radius: 9px;
  text-decoration: none;
  transition: transform 140ms var(--ease), opacity 140ms, background 140ms, border-color 140ms;
}
.btn:hover { transform: scale(1.035); }
.btn:active { transform: scale(0.97); }

.btn-primary {
  color: #0C0D10;
  font-weight: 700;
  background: #FFFFFF;
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.16);
}
.btn-primary:hover { opacity: 0.92; }

.btn-ghost {
  color: var(--ink);
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.08);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.2); }

.btn-big { font-size: 15px; padding: 16px 32px; }

.hero-note { margin-top: 14px; font-size: 12px; color: var(--faint); }

.wrap { max-width: 980px; margin: 0 auto; padding: 20px 20px 40px; }

section { margin-top: 64px; }

.sec-title {
  font-size: clamp(22px, 4.5vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  text-align: center;
  margin-bottom: 26px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 15px;
}

.step {
  padding: 22px 20px;
  border: 1px solid var(--stroke);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.35);
  transition: transform 200ms var(--ease), background 200ms, border-color 200ms;
}
.step:hover { transform: translateY(-4px); background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.2); }

.step-n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-size: 15px;
  font-weight: 800;
  color: #0C0D10;
  border-radius: 9px;
  background: #FFFFFF;
  box-shadow: 0 6px 18px rgba(255, 255, 255, 0.18);
  margin-bottom: 12px;
}

.step h3 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 13.5px; line-height: 1.55; color: var(--dim); }
.step b { color: var(--ink); font-family: Consolas, monospace; font-size: 12.5px; }

.keys {
  max-width: 620px;
  margin: 0 auto;
  border: 1px solid var(--stroke);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.key-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
}
.key-row + .key-row { border-top: 1px solid rgba(255, 255, 255, 0.08); }
.key-row span { font-size: 13.5px; color: var(--dim); }
.key-row:hover { background: rgba(255, 255, 255, 0.04); }

kbd {
  flex: 0 0 auto;
  min-width: 128px;
  text-align: center;
  font: 600 12.5px/1 Consolas, monospace;
  letter-spacing: 0.02em;
  color: var(--ink);
  padding: 9px 12px;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  background: var(--input);
  transition: border-color 140ms, background 140ms;
}
.key-row:hover kbd { border-color: rgba(255, 255, 255, 0.28); background: rgba(255, 255, 255, 0.09); }

.keys-note { text-align: center; margin-top: 12px; font-size: 12.5px; color: var(--faint); }

.feats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 15px;
}

.feat {
  padding: 20px;
  border: 1px solid var(--stroke);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.35);
  transition: transform 200ms var(--ease), background 200ms, border-color 200ms;
}
.feat:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.22);
}

.feat-icon {
  font-size: 22px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--stroke);
  margin-bottom: 12px;
  filter: grayscale(1) brightness(1.35);
}
.feat h3 { font-size: 15.5px; font-weight: 700; margin-bottom: 6px; }
.feat p { font-size: 13px; line-height: 1.55; color: var(--dim); }

.cta {
  text-align: center;
  padding: 44px 20px;
  border: 1px solid var(--stroke);
  border-radius: 16px;
  background: radial-gradient(80% 130% at 50% 0%, rgba(255, 255, 255, 0.07), transparent 70%), var(--card);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.35);
}
.cta h2 { font-size: clamp(20px, 4vw, 26px); font-weight: 800; margin-bottom: 20px; }

.foot { text-align: center; padding: 40px 20px 34px; font-size: 12.5px; color: var(--faint); }
.foot a { color: var(--ink); text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.25); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}