:root {
  --bg: #fafaf9;
  --card: #ffffff;
  --ink: #1a1a1a;
  --muted: #666;
  --line: #e5e5e3;
  --accent: #111;
  --accent-soft: #f1f1ef;
  --green: #0a7a3b;
  --amber: #a66100;
  --red: #9a1f1f;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif; }
a { color: var(--ink); }

.container { max-width: 960px; margin: 0 auto; padding: 2rem 1.5rem; }
header.nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
header.nav h1 { font-size: 1.25rem; margin: 0; letter-spacing: -0.01em; }
header.nav nav a { margin-left: 1rem; text-decoration: none; color: var(--muted); font-size: 0.9rem; }
header.nav nav a.primary { color: var(--ink); font-weight: 600; }

h2 { font-size: 1.5rem; margin: 0 0 1rem; letter-spacing: -0.01em; }
h3 { font-size: 1rem; margin: 1.5rem 0 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.25rem 1.5rem; margin-bottom: 1rem; }
.row { display: flex; gap: 1rem; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 180px; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 0.75rem; margin-bottom: 1.5rem; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.25rem; }
.stat .label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat .value { font-size: 1.5rem; font-weight: 600; margin-top: 0.25rem; }

table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
th, td { text-align: left; padding: 0.75rem 1rem; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
th { background: var(--accent-soft); font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.badge { display: inline-block; padding: 0.15rem 0.55rem; font-size: 0.75rem; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.badge.draft { background: var(--accent-soft); color: var(--muted); }
.badge.sent  { background: #fff3d9; color: var(--amber); }
.badge.paid  { background: #d8f0e0; color: var(--green); }

label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.35rem; }
input[type="text"], input[type="email"], input[type="date"], input[type="number"], textarea, select {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--ink); outline-offset: -1px; }
textarea { min-height: 80px; }

.field { margin-bottom: 1rem; }

button, .btn {
  display: inline-block;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
}
button.secondary, .btn.secondary { background: #fff; color: var(--ink); }
button.ghost, .btn.ghost { background: transparent; color: var(--muted); border-color: var(--line); }
button:hover, .btn:hover { opacity: 0.9; }

.actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; }

.share-box { display: flex; gap: 0.5rem; align-items: center; background: var(--accent-soft); padding: 0.75rem 1rem; border-radius: 8px; margin: 1rem 0; }
.share-box code { flex: 1; font-size: 0.85rem; overflow-x: auto; white-space: nowrap; }

.muted { color: var(--muted); }
.empty { text-align: center; padding: 3rem 1rem; color: var(--muted); }

/* Line item editor */
.items-table input { padding: 0.4rem 0.5rem; }
.items-table .remove-btn { background: transparent; color: var(--red); border-color: var(--line); padding: 0.3rem 0.6rem; }