:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #3b82f6;
  --accent-ink: #1d4ed8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.topbar .brand { font-weight: 700; text-decoration: none; color: var(--ink); }
.topbar nav a {
  margin-left: 1rem; text-decoration: none; color: var(--muted); font-weight: 500;
}
.topbar nav a:hover { color: var(--accent-ink); }

.container { max-width: 980px; margin: 1.5rem auto; padding: 0 1rem; }

h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h2 { font-size: 1.05rem; margin: 0 0 0.75rem; }

.cards { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.card {
  flex: 1 1 160px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 1rem;
}
.card-label { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.card-value { font-size: 1.5rem; font-weight: 700; margin-top: 0.25rem; }

.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 1rem 1.25rem; margin-bottom: 1.25rem;
}

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.5rem 0.5rem; border-bottom: 1px solid var(--line); }
thead th { color: var(--muted); font-weight: 600; }
tfoot th { border-top: 2px solid var(--line); }
tr.archived { color: var(--muted); }

a { color: var(--accent-ink); }

button, .btn {
  display: inline-block; background: var(--accent); color: #fff; border: 0;
  border-radius: 8px; padding: 0.45rem 0.8rem; font-size: 0.9rem;
  cursor: pointer; text-decoration: none;
}
button:hover, .btn:hover { background: var(--accent-ink); }

input, select {
  padding: 0.45rem 0.55rem; border: 1px solid var(--line);
  border-radius: 8px; font-size: 0.9rem; background: #fff;
}

.row-form, .filters { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.actions { display: flex; gap: 0.5rem; align-items: center; }
.actions form { display: inline; }
.actions details summary { cursor: pointer; color: var(--accent-ink); }
.actions details form { display: flex; gap: 0.4rem; margin-top: 0.4rem; }

.muted { color: var(--muted); }
.error { color: #b91c1c; background: #fee2e2; padding: 0.5rem 0.75rem; border-radius: 8px; }

.detail-grid { display: flex; gap: 1.5rem; flex-wrap: wrap; align-items: flex-start; }
.fields { display: grid; grid-template-columns: auto 1fr; gap: 0.3rem 1rem; }
.fields dt { color: var(--muted); }
.fields dd { margin: 0; font-weight: 500; }
.invoice-image img { max-width: 360px; border: 1px solid var(--line); border-radius: 8px; }

/* Login */
.login-body { display: grid; place-items: center; min-height: 100vh; }
.login-card {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 2rem; width: 320px; text-align: center;
}
.login-card form { display: grid; gap: 0.75rem; margin-top: 1rem; text-align: left; }
.login-card input { width: 100%; }
.tg-login { margin-top: 1rem; }