:root {
  --bg: #f7f7f8;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-text: #ffffff;
  --danger: #dc2626;
  --success: #16a34a;
  --error: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #f0f0f0;
    --muted: #9ca3af;
    --border: #333333;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body.centered {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  width: 100%;
  max-width: 360px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}

.topbar .brand {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
}

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: center;
}

.topbar nav a,
.link-button {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.95rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem;
}

h1 { font-size: 1.4rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; }
h3 { font-size: 1rem; margin-bottom: 0.3rem; }

.muted { color: var(--muted); }
.error { color: var(--error); }
.success { color: var(--success); }

label {
  display: block;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

input, select, textarea {
  width: 100%;
  padding: 0.6rem;
  margin-top: 0.3rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 1rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .grid-2 { grid-template-columns: 1fr; }
}

.table-scroll {
  overflow-x: auto;
}

table.doc-table, table.items-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  min-width: 480px;
}

table.doc-table th, table.doc-table td,
table.items-table th, table.items-table td {
  padding: 0.6rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 0.9rem;
  white-space: nowrap;
}

table.items-table input {
  padding: 0.4rem;
  min-width: 80px;
}

table.items-table td:first-child input {
  min-width: 160px;
}

button {
  cursor: pointer;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 0.95rem;
}

.actions a:not(.button) {
  display: inline-block;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
}

button.primary, .button {
  background: var(--primary);
  color: var(--primary-text);
  border: none;
  text-decoration: none;
  display: inline-block;
}

button.danger {
  color: var(--danger);
  border-color: var(--danger);
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

form.inline {
  display: inline;
}

.total {
  text-align: right;
  font-size: 1.2rem;
  font-weight: 700;
}

#add-row {
  margin-top: 0.5rem;
}

@media print {
  .no-print { display: none; }
}