:root {
  --bg: #0c0c0c;
  --panel: #151515;
  --line: #2a2a2a;
  --ink: #fcfcfc;
  --muted: #a8a8a8;
  --green: #80d010;
  --blue: #3cbcfc;
  --orange: #fc7c3c;
  --pixel: "Press Start 2P", ui-monospace, monospace;
  --body: system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--body);
}

header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 32px; padding-bottom: 8px; }

a { color: var(--blue); }
a:hover { color: var(--ink); }
.back { font: 10px var(--pixel); text-decoration: none; }

h1, h2, summary, button, kbd, .how b { font-family: var(--pixel); font-weight: normal; }
h1 { font-size: clamp(16px, 4vw, 22px); line-height: 1.6; margin: 24px 0 12px; }
h1 span { display: block; color: var(--blue); text-shadow: 3px 3px 0 var(--orange); font-size: 1.6em; margin-bottom: 8px; }
h2 { font-size: 14px; color: var(--green); margin: 0 0 16px; }
.lede { color: var(--muted); margin: 0 0 20px; }

nav { display: flex; flex-wrap: wrap; gap: 8px; }
nav a {
  font: 9px var(--pixel);
  text-decoration: none;
  padding: 8px 10px;
  border: 2px solid var(--line);
  color: var(--ink);
}
nav a:hover { border-color: var(--green); }

section { padding: 28px 0; border-top: 2px solid var(--line); scroll-margin-top: 16px; }
section:first-child { border-top: none; }
p, ul, ol { margin: 0 0 12px; }
li { margin-bottom: 6px; }
b { color: var(--ink); }
.tip { color: var(--muted); }
.g { color: var(--green); }
.o { color: var(--orange); }

details {
  background: var(--panel);
  border-left: 4px solid var(--line);
  margin-bottom: 10px;
  padding: 0 16px;
}
details[open] { border-left-color: var(--orange); padding-bottom: 6px; }
summary { cursor: pointer; font-size: 10px; line-height: 1.8; padding: 14px 0; }
details p, details ul { color: #dcdcdc; }

.how { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin-bottom: 16px; }
.how div { background: var(--panel); padding: 14px; color: #dcdcdc; font-size: 15px; }
.how b { display: block; font-size: 10px; color: var(--orange); margin-bottom: 8px; line-height: 1.6; }

table { border-collapse: collapse; width: 100%; margin-bottom: 12px; }
td { padding: 8px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
td:first-child { width: 9em; white-space: nowrap; }
kbd { font-size: 10px; color: var(--orange); }

button {
  font-size: 10px;
  padding: 12px 16px;
  color: #000;
  background: var(--orange);
  border: none;
  cursor: pointer;
  box-shadow: 4px 4px 0 #8c3c0c;
}
button:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 #8c3c0c; }
.msg { color: var(--green); margin-top: 14px; min-height: 1em; }

footer {
  display: flex;
  gap: 18px;
  align-items: center;
  padding-top: 28px;
  padding-bottom: 40px;
  border-top: 2px solid var(--line);
}
footer img { flex: none; border-radius: 4px; }
footer p { margin: 0 0 6px; }
.fine { color: var(--muted); font-size: 13px; }

/* Chip in (UPI) */
.chipin { display: grid; gap: 16px; margin: 6px 0 16px; }
.chip-amounts { border: 0; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chip-amounts legend { font-size: 13px; color: var(--muted); margin-bottom: 8px; padding: 0; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.chip span {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  cursor: pointer;
  border: 2px solid var(--line);
  font: 600 15px var(--body); /* the pixel font has no ₹ */
}
.chip span:hover { border-color: var(--orange); color: var(--orange); }
.chip input:checked + span { background: var(--orange); border-color: var(--orange); color: #000; }
.chip input:focus-visible + span { outline: 2px solid var(--orange); outline-offset: 2px; }
.chip-pay { display: flex; flex-wrap: wrap; gap: 16px; align-items: flex-start; }
.chip-app {
  font: 10px var(--pixel);
  padding: 14px 16px;
  color: #000;
  background: var(--orange);
  text-decoration: none;
  box-shadow: 4px 4px 0 #8c3c0c;
}
.chip-app:hover { color: #000; }
.chip-qr { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.chip-qr img { display: block; width: 168px; height: 168px; background: #fff; border-radius: 6px; }
.chip-hint { margin: 0; max-width: 24ch; font-size: 13px; color: var(--muted); }
.chip-id { margin: 0; font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chip-id code { color: var(--ink); }
.chip-copy {
  all: unset;
  cursor: pointer;
  font-size: 13px;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 10px 2px;
}
.chip-copy:hover { color: var(--orange); }
.chip-copy:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }
.chip-status { font: 9px var(--pixel); color: var(--orange); }
/* UPI apps live on phones: on desktop the QR is the way in. */
.on-touch { display: none; }
@media (hover: hover) and (pointer: fine) { .chip-app { display: none; } }
@media not ((hover: hover) and (pointer: fine)) { .on-hover { display: none; } .on-touch { display: inline; } }