:root {
  --bg: #0b0f14;
  --bg-2: #11171e;
  --card: #151c24;
  --line: #243040;
  --text: #e8eef4;
  --muted: #8a9aab;
  --accent: #3ee6b0;
  --accent-ink: #062a1f;
  --warn: #ffb547;
  --err: #ff6b6b;
  --radius: 16px;
  --display: "Space Grotesk", system-ui, sans-serif;
  --body: "Inter", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text); font: 15px/1.55 var(--body);
  background-image: radial-gradient(1000px 500px at 85% -10%, rgba(62,230,176,.10), transparent 60%);
  min-height: 100vh; display: flex; flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.hidden { display: none !important; }
.mono { font-family: var(--mono); }
.small { font-size: 12px; }

/* top bar */
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 18px clamp(16px, 5vw, 56px); }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font: 700 20px var(--display); letter-spacing: -.02em; }
.logo:hover { text-decoration: none; }
.logo-mark { width: 28px; height: 28px; border-radius: 8px; background: url(/static/favicon.svg) center/cover no-repeat; box-shadow: 0 0 20px rgba(62,230,176,.35); }
.topbar nav { display: flex; gap: clamp(12px, 3vw, 28px); }
.topbar nav a { color: var(--muted); font-weight: 500; }
.topbar nav a:hover { color: var(--text); text-decoration: none; }

main { flex: 1; width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 16px; }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(24px, 5vw, 64px); align-items: start; padding: clamp(24px, 6vw, 72px) 0 56px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 12px; }
h1 { font: 700 clamp(38px, 6vw, 64px)/1.02 var(--display); letter-spacing: -.035em; margin: 0 0 20px; }
.lead { color: var(--muted); font-size: 17px; max-width: 30em; }
.ticks { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; }
.ticks li { padding-left: 28px; position: relative; }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* card */
.card { background: var(--card); border: 1px solid var(--line); border-radius: 22px; padding: 22px; box-shadow: 0 30px 80px rgba(0,0,0,.35); position: relative; }
.field-label { display: block; font-size: 13px; color: var(--muted); margin: 0 0 8px; font-weight: 500; }
.field-label.warn { color: var(--warn); margin-top: 12px; }
.approx { color: #5f6f80; font-weight: 400; }
.amount-row { display: flex; align-items: center; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 6px 6px 16px; transition: border-color .15s; }
.amount-row:focus-within { border-color: var(--accent); }
.amount-row input, .amount-row output { flex: 1; min-width: 0; background: none; border: 0; outline: 0; color: var(--text); font: 600 26px var(--display); padding: 8px 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.coin-btn { display: flex; align-items: center; gap: 8px; background: var(--card); border: 1px solid var(--line); color: var(--text); border-radius: 12px; padding: 10px 12px; cursor: pointer; font: 600 15px var(--body); white-space: nowrap; }
.coin-btn:hover { border-color: #3a4a5c; }
.coin-btn img, #picker-list img { flex: none; object-fit: contain; width: 24px; height: 24px; border-radius: 50%; background: #fff1; }
.coin-btn::after { content: "▾"; color: var(--muted); font-size: 12px; }
.net { font-size: 11px; font-weight: 600; color: var(--muted); background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; text-transform: uppercase; }
.hint { color: var(--muted); font-size: 13px; margin: 8px 2px 14px; min-height: 1.2em; }
.hint.bad { color: var(--err); }
.hint.good { color: var(--accent); }
.flip { display: block; margin: -6px auto 6px; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); background: var(--bg-2); color: var(--text); font-size: 18px; cursor: pointer; transition: transform .2s; }
.flip:hover { transform: rotate(180deg); border-color: var(--accent); }
.primary { width: 100%; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 14px; padding: 15px; font: 700 16px var(--display); cursor: pointer; margin-top: 6px; transition: filter .15s, opacity .15s; }
.primary:hover:not(:disabled) { filter: brightness(1.08); }
.primary:disabled { opacity: .35; cursor: not-allowed; }
.primary.slim { width: auto; padding: 12px 22px; margin: 0; }
.ghost { width: 100%; background: none; border: 1px solid var(--line); color: var(--text); border-radius: 14px; padding: 13px; font: 600 15px var(--body); cursor: pointer; margin-top: 12px; }
.ghost:hover { border-color: var(--accent); }
.fine { color: #66778a; font-size: 12px; margin: 12px 0 0; }
.error { color: var(--err); font-size: 14px; margin: 10px 0 0; }
.back { background: none; border: 0; color: var(--muted); cursor: pointer; padding: 0; margin-bottom: 14px; font: 500 14px var(--body); }
.back:hover { color: var(--text); }
.summary { background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin-bottom: 18px; font-weight: 600; }
.summary span { color: var(--muted); font-weight: 400; }
.text-input { width: 100%; background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: 13px 14px; color: var(--text); font: 14px var(--mono); outline: 0; }
.text-input:focus { border-color: var(--accent); }
.refund { margin: 4px 0 16px; }
.refund summary { cursor: pointer; color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--muted); margin: 8px 0 14px; cursor: pointer; }
.check input { margin-top: 3px; accent-color: var(--accent); }

/* order */
.order-head { display: flex; justify-content: space-between; align-items: center; color: var(--muted); margin-bottom: 18px; }
.copy { background: var(--bg-2); border: 1px solid var(--line); color: var(--text); border-radius: 10px; padding: 8px 10px; cursor: pointer; text-align: left; font-size: 13px; word-break: break-all; }
.copy:hover { border-color: var(--accent); }
.copy.addr { width: 100%; font-size: 14px; padding: 12px; }
.steps { list-style: none; display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; padding: 0; margin: 0 0 22px; counter-reset: s; }
.steps li { font-size: 11px; color: #5f6f80; text-align: center; padding-top: 12px; border-top: 3px solid var(--line); }
.steps li.done { color: var(--muted); border-color: var(--accent); }
.steps li.now { color: var(--text); border-color: var(--accent); font-weight: 600; }
.send-line { margin: 0 0 12px; }
.send-line strong { font: 700 20px var(--display); color: var(--accent); }
.deposit { display: grid; grid-template-columns: 132px 1fr; gap: 16px; align-items: start; }
#qr { background: #fff; border-radius: 12px; padding: 8px; line-height: 0; }
#qr svg { width: 100%; height: auto; }
.facts { display: grid; gap: 10px; margin: 20px 0 0; padding: 16px 0 0; border-top: 1px solid var(--line); }
.facts div { display: flex; justify-content: space-between; gap: 16px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; text-align: right; font-weight: 600; word-break: break-all; }

/* sections */
section h2 { font: 700 30px var(--display); letter-spacing: -.02em; margin: 0 0 24px; }
.how { padding: 48px 0; border-top: 1px solid var(--line); }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.how-grid div { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.how-grid h3 { margin: 12px 0 6px; font: 600 18px var(--display); }
.how-grid p { margin: 0; color: var(--muted); }
.num { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: rgba(62,230,176,.12); color: var(--accent); font-weight: 700; }
.track { padding: 48px 0 72px; border-top: 1px solid var(--line); }
.track-form { display: flex; gap: 10px; max-width: 560px; }

/* footer */
.footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding: 24px clamp(16px, 5vw, 56px); border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer .links { display: flex; gap: 18px; }
.footer .links a { color: var(--muted); }

/* picker */
.modal { position: fixed; inset: 0; background: rgba(4,7,10,.7); backdrop-filter: blur(4px); display: grid; place-items: center; padding: 16px; z-index: 20; }
.modal-card { width: 100%; max-width: 460px; max-height: 78vh; display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; }
.modal-head { display: flex; gap: 8px; padding: 14px; border-bottom: 1px solid var(--line); }
.modal-head .text-input { font-family: var(--body); }
.icon-btn { background: none; border: 1px solid var(--line); color: var(--muted); border-radius: 10px; width: 44px; cursor: pointer; }
#picker-list { list-style: none; margin: 0; padding: 6px; overflow-y: auto; }
#picker-list li { display: flex; align-items: center; gap: 12px; padding: 10px; border-radius: 10px; cursor: pointer; }
#picker-list li:hover, #picker-list li.active { background: var(--bg-2); }
#picker-list .t { font-weight: 600; }
#picker-list .n { color: var(--muted); font-size: 13px; margin-left: auto; text-align: right; max-width: 55%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#picker-list .group { cursor: default; font-size: 12px; color: #5f6f80; text-transform: uppercase; letter-spacing: .08em; padding: 12px 10px 4px; }
#picker-list .group:hover { background: none; }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--accent); color: var(--accent-ink); padding: 10px 18px; border-radius: 12px; font-weight: 600; z-index: 30; }

/* legal pages */
.doc { max-width: 760px; padding: 32px 0 72px; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); }
.doc h2 { font: 600 20px var(--display); margin: 32px 0 8px; }
.doc p, .doc li { color: #c3cfdb; }
.doc .updated { color: var(--muted); }

@media (max-width: 880px) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .card { max-width: 520px; width: 100%; }
  .how-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .topbar nav a:first-child { display: none; }
  .card { padding: 16px; border-radius: 18px; }
  .deposit { grid-template-columns: 1fr; }
  #qr { width: 150px; }
  .track-form { flex-direction: column; }
  .primary.slim { width: 100%; }
  .steps li { font-size: 10px; }
}