:root {
  --bg: #0b1220;
  --bg-soft: #111a2e;
  --card: rgba(17, 26, 46, 0.86);
  --line: rgba(148, 163, 184, 0.18);
  --text: #e8eefc;
  --muted: #93a4c3;
  --accent: #5b8cff;
  --accent-2: #22d3ee;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #fb7185;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(91, 140, 255, 0.22), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(34, 211, 238, 0.12), transparent 50%),
    var(--bg);
}

body {
  display: flex;
  flex-direction: column;
}

.wrap {
  width: min(920px, calc(100% - 32px));
  margin: 48px auto 24px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  margin-bottom: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.badge i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 12px var(--accent-2);
}

h1 {
  margin: 12px 0 8px;
  font-size: 36px;
  letter-spacing: -0.03em;
}

.sub {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.amount-chip {
  min-width: 180px;
  padding: 16px 18px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(91, 140, 255, 0.18), rgba(17, 26, 46, 0.5));
  border: 1px solid var(--line);
  text-align: right;
}

.amount-chip span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.amount-chip strong {
  font-size: 28px;
}

.grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

label {
  display: block;
  margin: 14px 0 8px;
  color: var(--muted);
  font-size: 13px;
}

input {
  width: 100%;
  height: 46px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #0d1628;
  color: var(--text);
  outline: none;
}

input:focus {
  border-color: rgba(91, 140, 255, 0.7);
  box-shadow: 0 0 0 4px rgba(91, 140, 255, 0.12);
}

.row {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

button, .ghost {
  height: 46px;
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 650;
}

button[type="submit"] {
  flex: 1;
  background: linear-gradient(180deg, #7aa2ff, #4d7dff);
  color: #08101f;
}

button[type="submit"]:hover { filter: brightness(1.05); }

.ghost {
  padding: 0 16px;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
}

.notice {
  margin: 0 0 16px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  font-size: 14px;
}

.notice.ok { background: rgba(52, 211, 153, 0.12); color: #bbf7d0; }
.notice.err { background: rgba(251, 113, 133, 0.12); color: #fecdd3; }
.notice.warn { background: rgba(251, 191, 36, 0.12); color: #fde68a; }

.meta {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.meta b { color: var(--text); }

details {
  margin-top: 16px;
}

summary {
  cursor: pointer;
  color: var(--muted);
}

.tips li { margin: 8px 0; color: var(--muted); }

footer {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto 40px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 760px) {
  .hero, .grid { grid-template-columns: 1fr; display: grid; }
  h1 { font-size: 28px; }
  .amount-chip { text-align: left; }
}