:root {
  --black: #08090B;
  --silver: #D2D3D5;
  --panel: #111317;
  --border: #23262D;
  --muted: #8A8D94;
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--black);
  color: var(--silver);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

.glow {
  position: absolute;
  top: -20vh; left: 50%;
  width: 90vw; height: 80vh;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(210,211,213,0.10), transparent 65%);
  pointer-events: none;
}

.container { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 20px; position: relative; }

/* Nav */
.nav {
  max-width: 1040px; margin: 0 auto;
  padding: 20px;
  display: flex; align-items: center; justify-content: space-between;
  position: relative;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--silver); }
.logo-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(145deg, #E6E7E9, #9C9EA3);
  color: var(--black); font-weight: 700;
  display: grid; place-items: center;
}
.wordmark { font-weight: 600; letter-spacing: 0.28em; font-size: 14px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 22px;
  border-radius: 999px;
  background: linear-gradient(145deg, #EDEEF0, #B9BBBF);
  color: var(--black);
  font-weight: 600; font-size: 15px;
  text-decoration: none;
  transition: opacity .15s, transform .1s;
}
.btn:hover { opacity: .92; }
.btn:active { transform: scale(.99); }
.btn-ghost { background: transparent; color: var(--silver); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--silver); opacity: 1; }
.btn-small { padding: 9px 16px; font-size: 13.5px; }

.badge {
  display: inline-block;
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  border: 1px solid var(--border); color: var(--muted);
  padding: 4px 10px; border-radius: 999px;
  margin-bottom: 16px;
}

/* Hero */
.hero { text-align: center; padding-top: 56px; padding-bottom: 24px; }
h1 {
  color: #fff;
  font-size: clamp(32px, 6vw, 54px);
  line-height: 1.1; letter-spacing: -0.02em; font-weight: 700;
  margin-bottom: 18px;
}
.silver {
  background: linear-gradient(180deg, #F1F2F4, #9C9EA3);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { color: var(--muted); font-size: 16px; max-width: 600px; margin: 0 auto; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }

/* Sections */
.section { padding-top: 72px; }
h2 { color: #fff; font-size: clamp(24px, 3.4vw, 32px); letter-spacing: -0.01em; font-weight: 600; }
h3 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.section-sub { color: var(--muted); margin: 6px 0 28px; }

/* Steps */
.steps {
  list-style: none;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
}
.steps li, .rule {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
}
.steps p, .rule p { color: var(--muted); font-size: 14px; }
.step-num { display: block; font-size: 12px; color: var(--muted); letter-spacing: .1em; margin-bottom: 18px; }

/* Calculator */
.calc {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}
.calc-inputs { padding: 28px; display: grid; gap: 26px; }
.calc-label { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.calc-label label { font-size: 14px; font-weight: 500; }
.calc-label output { color: #fff; font-weight: 600; font-size: 15px; }
.range-ends { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-top: 6px; }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 6px;
  border-radius: 999px;
  background: var(--border);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: linear-gradient(145deg, #F1F2F4, #A9ABB0);
  border: 3px solid var(--black);
  box-shadow: 0 0 0 1px var(--silver);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: #D2D3D5; border: 3px solid var(--black);
  box-shadow: 0 0 0 1px var(--silver); cursor: pointer;
}
input[type="range"]:focus-visible { box-shadow: 0 0 0 3px rgba(210,211,213,0.2); }

.calc-result {
  padding: 28px;
  background: var(--black);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 14px;
}
.result-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-bottom: 14px; border-bottom: 1px solid var(--border);
  font-size: 14px; color: var(--muted);
}
.result-row strong { color: #fff; font-size: 18px; font-weight: 600; }
.result-row.big strong { font-size: 26px; }
.calc-note { font-size: 12px; color: var(--muted); margin-top: auto; }

/* Rules */
.rules { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 24px; }

/* Invite */
.invite {
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 48px 24px;
  background: radial-gradient(ellipse at top, rgba(210,211,213,0.08), transparent 70%), var(--panel);
}
.invite h2 { margin-bottom: 12px; }
.invite-steps {
  text-align: left;
  max-width: 460px; margin: 26px auto 0;
  padding-left: 20px;
  color: var(--muted); font-size: 15px;
}
.invite-steps li + li { margin-top: 8px; }
.invite-steps strong { color: var(--silver); }

.hero-countdown { margin-top: 40px; }
.foot .socials { margin-bottom: 16px; }

/* Risk + footer */
.risk p { color: var(--muted); font-size: 13px; max-width: 760px; }
.risk h3 { font-size: 14px; }
.foot { text-align: center; font-size: 12px; color: #5C5F66; padding-top: 48px; padding-bottom: 40px; }
.foot p + p { margin-top: 6px; }

/* Responsive */
@media (max-width: 860px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .calc { grid-template-columns: 1fr; }
  .calc-result { border-left: 0; border-top: 1px solid var(--border); }
}
@media (max-width: 520px) {
  .steps, .rules { grid-template-columns: 1fr; }
  .hero { padding-top: 32px; }
  .section { padding-top: 56px; }
  .calc-inputs, .calc-result { padding: 22px; }
}