/* Boomerang — monochrome ink/paper, hairline borders, no glow */
:root {
  --ink: #16161a;
  --ink-2: #4a4a52;
  --ink-3: #8a8a93;
  --paper: #fafaf8;
  --card: #ffffff;
  --line: #e4e4e0;
  --warn: #b45309;
  --danger: #b91c1c;
  --radius: 10px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
}
a { color: inherit; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }

/* type */
h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); letter-spacing: -0.03em; line-height: 1.08; font-weight: 700; }
h2 { font-size: 1.35rem; letter-spacing: -0.02em; font-weight: 650; }
.kicker { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-3); font-weight: 600; }
.sub { color: var(--ink-2); font-size: 1.05rem; }
.small { font-size: 0.85rem; color: var(--ink-3); }
.mono { font-variant-numeric: tabular-nums; font-family: ui-monospace, "SF Mono", Menlo, monospace; }

/* layout blocks */
.nav { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; letter-spacing: -0.02em; font-size: 1.05rem; }
.brand span { color: var(--ink-3); font-weight: 500; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 640px) { .grid3 { grid-template-columns: 1fr 1fr; } }

/* buttons & inputs */
button, .btn {
  appearance: none; border: 1px solid var(--ink); background: var(--ink); color: #fff;
  font: inherit; font-weight: 600; border-radius: 8px; padding: 13px 20px;
  cursor: pointer; width: 100%; font-size: 1rem; text-align: center; text-decoration: none; display: inline-block;
}
button:active { transform: translateY(1px); }
button.ghost, .btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
button.warn { background: transparent; color: var(--warn); border-color: var(--warn); }
button:disabled { opacity: 0.45; cursor: default; }
input, select {
  width: 100%; font: inherit; padding: 13px 14px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--card); color: var(--ink); font-size: 1.05rem;
}
input:focus { outline: none; border-color: var(--ink-2); }
label { display: block; font-size: 0.82rem; font-weight: 600; color: var(--ink-2); margin: 14px 0 6px; }
.err { color: var(--danger); font-size: 0.9rem; min-height: 1.3em; margin-top: 10px; }

/* stat tiles */
.tile { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.tile .v { font-size: 1.7rem; font-weight: 700; letter-spacing: -0.02em; }
.tile .l { font-size: 0.78rem; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.1em; font-weight: 600; margin-top: 2px; }
.tile.warn .v { color: var(--warn); }

/* tabs */
.tabs { display: flex; gap: 8px; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.tabs button { width: auto; background: none; border: none; color: var(--ink-3); font-weight: 600; padding: 10px 4px; border-radius: 0; border-bottom: 2px solid transparent; }
.tabs button.on { color: var(--ink); border-bottom-color: var(--ink); }

/* customer-facing confirmation overlay */
.overlay {
  position: fixed; inset: 0; background: var(--ink); color: #fff; z-index: 50;
  display: none; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 32px; cursor: pointer;
}
.overlay.show { display: flex; }
.overlay .big { font-size: clamp(2.6rem, 9vw, 4.5rem); font-weight: 700; letter-spacing: -0.03em; line-height: 1.1; }
.overlay .mid { font-size: 1.25rem; opacity: 0.75; margin-top: 14px; }
.overlay .bal { font-size: 1.6rem; margin-top: 30px; font-weight: 650; border-top: 1px solid rgba(255,255,255,0.25); padding-top: 22px; }
.overlay .tap { position: absolute; bottom: 26px; font-size: 0.8rem; opacity: 0.5; letter-spacing: 0.1em; text-transform: uppercase; }

/* table */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th { text-align: left; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3); padding: 8px 10px; border-bottom: 1px solid var(--line); }
td { padding: 9px 10px; border-bottom: 1px solid var(--line); }
.tableWrap { overflow-x: auto; }

/* landing specifics */
.hero { padding: 72px 0 44px; }
.steps { counter-reset: s; display: grid; gap: 14px; margin: 26px 0; }
.step { display: flex; gap: 16px; align-items: baseline; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.step::before { counter-increment: s; content: counter(s); font-weight: 700; font-size: 0.9rem; border: 1px solid var(--ink); border-radius: 50%; width: 26px; height: 26px; min-width: 26px; display: flex; align-items: center; justify-content: center; transform: translateY(4px); }
.receipt {
  background: var(--card); border: 1px dashed var(--ink-3); border-radius: 6px; padding: 18px 20px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.88rem; max-width: 380px;
}
.receipt .hl { font-weight: 700; }
.receipt hr { border: none; border-top: 1px dashed var(--line); margin: 8px 0; }
footer { padding: 40px 0 60px; color: var(--ink-3); font-size: 0.85rem; }
.spacer { height: 28px; }
.row { display: flex; gap: 10px; align-items: center; }
.row > * { flex: 1; }