:root {
  --paper: oklch(0.982 0.008 92);
  --panel: oklch(0.995 0.004 92);
  --ink: oklch(0.245 0.015 78);
  --ink-soft: oklch(0.44 0.018 76);
  --ink-faint: oklch(0.62 0.015 76);
  --line: oklch(0.87 0.014 87);
  --green: oklch(0.59 0.15 145);
  --red: oklch(0.57 0.19 27);
  --alipay: oklch(0.6 0.16 245);
  --display: "Shantell Sans", "Xiaolai SC", "Kaiti SC", STKaiti, cursive;
  --body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  --shadow: 0 1px 2px oklch(0.2 0.01 80 / 0.06), 0 18px 60px oklch(0.2 0.01 80 / 0.09);
}

* { box-sizing: border-box; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 18%, oklch(0.95 0.04 235 / 0.34), transparent 30rem),
    radial-gradient(circle at 88% 42%, oklch(0.96 0.06 98 / 0.5), transparent 31rem),
    var(--paper);
  font-family: var(--body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 3px solid oklch(0.68 0.12 245 / 0.55);
  outline-offset: 3px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px clamp(18px, 5vw, 48px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.15rem;
}
.secure-note { color: var(--ink-faint); font-size: 14px; }

main {
  width: min(560px, 100% - 36px);
  margin: 0 auto;
  padding: clamp(8px, 3vw, 32px) 0 64px;
}

.panel {
  padding: clamp(24px, 5vw, 38px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

h1 {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: clamp(1.6rem, 4.4vw, 2.05rem);
  font-weight: 800;
  line-height: 1.2;
}
.lede { margin: 0 0 24px; color: var(--ink-soft); }

label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 14px; }
input[type="email"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: oklch(1 0 0);
  color: inherit;
}
.field { margin-bottom: 18px; }
.field-hint { margin: 6px 0 0; font-size: 13px; color: var(--ink-faint); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 13px 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}
.button[disabled] { opacity: 0.55; cursor: progress; }
.button-quiet {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line);
  font-weight: 600;
}

.error {
  margin: 0 0 16px;
  padding: 11px 14px;
  border: 1px solid oklch(0.57 0.19 27 / 0.32);
  border-radius: 12px;
  background: oklch(0.57 0.19 27 / 0.07);
  color: var(--red);
  font-size: 14px;
}

.fine { margin: 18px 0 0; font-size: 13px; color: var(--ink-faint); }
.fine a { color: var(--alipay); }

.amount-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  margin-bottom: 18px;
}
.amount { font-family: var(--display); font-size: 2.3rem; font-weight: 800; }
.amount-note { color: var(--ink-faint); font-size: 14px; }

.qr-frame {
  width: min(268px, 74vw);
  margin: 0 auto 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: oklch(1 0 0);
}
.qr-frame svg { display: block; width: 100%; height: auto; }

.scan-copy { margin: 0 0 6px; text-align: center; font-weight: 600; }
.countdown, .status-line {
  margin: 0;
  text-align: center;
  font-size: 14px;
  color: var(--ink-faint);
}
.status-line { margin-top: 10px; }
.status-line[data-state="confirming"] { color: var(--alipay); font-weight: 600; }
.status-line[data-state="expired"] { color: var(--red); font-weight: 600; }
.panel-actions { margin-top: 22px; display: grid; gap: 10px; }

.done-mark {
  width: 52px;
  height: 52px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: oklch(0.59 0.15 145 / 0.12);
  color: var(--green);
  display: grid;
  place-items: center;
  font-size: 26px;
  font-weight: 700;
}
.key-list { margin: 18px 0 0; display: grid; gap: 8px; }
.key-row {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: oklch(1 0 0);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}
.center { text-align: center; }