:root {
  --bg: #f4f5f7; --card: #fff; --text: #16181d; --muted: #6b7280; --line: #e5e7eb;
  --accent: #2563eb; --accent-text: #fff; --ok: #16a34a; --err: #dc2626; --warn-bg: #fef3c7; --warn: #92400e;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1115; --card: #1a1d23; --text: #eceef2; --muted: #9aa1ad; --line: #2c313a;
    --accent: #3b82f6; --warn-bg: #3a2e10; --warn: #fcd34d; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.wrap { max-width: 480px; margin: 0 auto; padding: 16px 16px 32px; }
.top { display: flex; align-items: center; gap: 10px; margin: 8px 0 16px; }
.logo { font-size: 28px; }
h1 { font-size: 20px; margin: 0; }
h2 { font-size: 17px; margin: 0 0 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; margin-bottom: 16px; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }
.error { color: var(--err); margin: 10px 0 0; }
.note { background: var(--warn-bg); color: var(--warn); border-radius: 8px; padding: 6px 10px; font-size: 13px; margin-top: 6px; }

.drop { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 32px 12px;
  border: 2px dashed var(--line); border-radius: 14px; cursor: pointer; text-align: center; }
.drop:active { border-color: var(--accent); }
.drop input { display: none; }
.drop-icon { font-size: 40px; }

.fileinfo { background: var(--bg); border-radius: 10px; padding: 10px 12px; margin-bottom: 14px; word-break: break-word; }
.field { margin-bottom: 14px; }
.field > label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
.row { display: flex; gap: 12px; }
.grow { flex: 1; min-width: 0; }

.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg button { flex: 1 1 auto; min-height: 44px; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--text); font: inherit; font-size: 15px; cursor: pointer; }
#paperSeg button { flex: 1 1 28%; }
.seg button.on { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }

.stepper { display: flex; align-items: center; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; height: 44px; }
.stepper button { width: 42px; height: 100%; border: 0; background: var(--bg); color: var(--text); font-size: 20px; cursor: pointer; }
.stepper input { width: 48px; height: 100%; border: 0; text-align: center; font: inherit; background: var(--card); color: var(--text); -moz-appearance: textfield; }
.stepper input::-webkit-outer-spin-button, .stepper input::-webkit-inner-spin-button { -webkit-appearance: none; }
input[type=text] { width: 100%; height: 44px; border: 1px solid var(--line); border-radius: 10px; padding: 0 12px; font: inherit; background: var(--card); color: var(--text); }

.summary { display: flex; justify-content: space-between; align-items: center; gap: 12px; border-top: 1px solid var(--line); padding-top: 14px; margin-top: 4px; }
.summary .muted { font-size: 14px; }
.total { font-size: 26px; font-weight: 700; white-space: nowrap; }

.primary { width: 100%; min-height: 52px; margin-top: 14px; border: 0; border-radius: 12px; background: var(--ok); color: #fff;
  font: inherit; font-size: 18px; font-weight: 600; cursor: pointer; }
.primary:disabled { opacity: .5; cursor: default; }
.link { display: block; margin: 12px auto 0; background: none; border: 0; color: var(--accent); font: inherit; cursor: pointer; padding: 6px; }

.btnlink { display: flex; align-items: center; justify-content: center; text-decoration: none; background: var(--accent); }
.upi-qr { width: 220px; max-width: 70%; background: #fff; padding: 8px; border-radius: 12px; margin: 4px auto 8px; display: block; }
.vpa { margin-bottom: 12px; word-break: break-all; }
.link.inline { display: inline; margin: 0 0 0 6px; padding: 0; }
.left { text-align: left; }
.note.left { margin: 0 0 14px; }
.status-icon { font-size: 56px; margin: 8px 0; }
.code { display: inline-block; background: var(--bg); border-radius: 10px; padding: 8px 16px; margin: 6px 0 10px; }
.code strong { font-size: 22px; letter-spacing: 3px; margin-left: 6px; }
.spinner { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--line); border-top-color: var(--accent);
  border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -3px; }
@keyframes spin { to { transform: rotate(360deg); } }