* { box-sizing: border-box; }
:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --border: #2a2f3a;
  --text: #e7e9ee;
  --muted: #8a92a3;
  --accent: #5ee3a1;
  --accent-2: #3fb4ff;
  --danger: #ff6b6b;
  --warn: #f5b841;
}
html, body { margin: 0; padding: 0; min-height: 100%; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); }
body { display: flex; flex-direction: column; min-height: 100vh; }
button { font: inherit; cursor: pointer; border: none; background: transparent; color: inherit; }
input, textarea, select { font: inherit; background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 8px 10px; width: 100%; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent-2); }
h1, h2, h3, h4 { margin: 0 0 0.5em; font-weight: 600; }
h2 { font-size: 20px; }
h3 { font-size: 16px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
h4 { font-size: 14px; margin-top: 1em; }
a { color: var(--accent-2); }

/* Brand */
.brand { display: flex; align-items: center; gap: 10px; }
.brand h1, .brand strong { margin: 0; font-size: 18px; letter-spacing: -0.01em; }
.blip {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(94, 227, 161, 0.2), 0 0 20px rgba(94, 227, 161, 0.6);
  animation: blip 2.5s ease-in-out infinite;
}
@keyframes blip {
  0%, 70%, 100% { transform: scale(1); opacity: 1; }
  80% { transform: scale(1.4); opacity: 0.7; }
  90% { transform: scale(1); opacity: 1; }
}

/* Auth */
.auth-shell { flex: 1; display: grid; place-items: center; padding: 20px; }
.auth-card { width: 100%; max-width: 420px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 32px; }
.auth-card .brand { justify-content: center; margin-bottom: 4px; }
.tagline { text-align: center; color: var(--muted); margin: 0 0 20px; font-size: 14px; }
.tabs { display: flex; gap: 2px; background: var(--panel-2); padding: 4px; border-radius: 8px; margin-bottom: 20px; }
.tabs button { flex: 1; padding: 8px 12px; border-radius: 6px; color: var(--muted); font-size: 14px; }
.tabs button.active { background: var(--panel); color: var(--text); }
.auth-form, .form { display: grid; gap: 12px; }
.auth-form label, .form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.auth-form label span em, .form label span em { color: var(--muted); font-style: normal; font-size: 11px; }
.auth-error { color: var(--danger); font-size: 13px; background: rgba(255, 107, 107, 0.1); padding: 8px 10px; border-radius: 6px; }
.auth-info { color: var(--accent); font-size: 13px; background: rgba(94, 227, 161, 0.1); padding: 8px 10px; border-radius: 6px; }
.auth-heading { color: var(--text); text-transform: none; letter-spacing: 0; font-size: 16px; margin-top: 8px; text-align: center; }

/* Buttons */
button.primary {
  background: var(--accent); color: #0a1f13; font-weight: 600;
  padding: 10px 16px; border-radius: 8px;
  transition: transform 0.1s, filter 0.1s;
}
button.primary:hover { filter: brightness(1.1); }
button.primary:active { transform: translateY(1px); }
button.primary:disabled { opacity: 0.5; cursor: not-allowed; }
button.ghost { background: var(--panel-2); border: 1px solid var(--border); padding: 8px 14px; border-radius: 6px; }
button.ghost:hover { background: var(--border); }
button.link { color: var(--accent-2); padding: 4px 8px; font-size: 13px; }
button.link:hover { text-decoration: underline; }

/* App */
.app-shell { flex: 1; display: flex; flex-direction: column; }
.app-header {
  display: flex; align-items: center; gap: 24px;
  background: var(--panel); border-bottom: 1px solid var(--border);
  padding: 12px 24px; position: sticky; top: 0; z-index: 10;
}
.app-header .tabs { margin: 0; background: transparent; padding: 0; flex: 1; }
.app-header .tabs button { flex: 0 0 auto; padding: 8px 14px; }
.who { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }

.panel { padding: 24px; max-width: 1100px; margin: 0 auto; width: 100%; }
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 32px; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.stat .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
.stat .value { font-size: 28px; font-weight: 600; margin: 4px 0; }
.stat .sub { color: var(--muted); font-size: 12px; }
.stat.overdue .value { color: var(--danger); }
.stat.paid .value { color: var(--accent); }

/* Tables */
table.data { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
table.data th, table.data td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
table.data th { background: var(--panel-2); color: var(--muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: var(--panel-2); }
table.data .r { text-align: right; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }
.st-draft { background: rgba(138, 146, 163, 0.15); color: var(--muted); }
.st-sent { background: rgba(63, 180, 255, 0.15); color: var(--accent-2); }
.st-paid { background: rgba(94, 227, 161, 0.15); color: var(--accent); }
.st-void { background: rgba(255, 107, 107, 0.12); color: var(--danger); text-decoration: line-through; }

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

.empty { color: var(--muted); text-align: center; padding: 32px; font-size: 14px; }
.hint { color: var(--muted); font-size: 13px; margin-top: -4px; }

.form { max-width: 560px; }
.form label.wide { grid-column: 1 / -1; }
.saved { color: var(--accent); font-size: 13px; margin-left: 12px; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: grid; place-items: center; padding: 20px; z-index: 100; }
.modal-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; width: 100%; max-width: 480px; max-height: 90vh; overflow: auto; }
.modal-card.wide-modal { max-width: 820px; }
.modal-card header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-card header h3 { margin: 0; color: var(--text); text-transform: none; letter-spacing: 0; font-size: 16px; }
.modal-card .form, .invoice-edit { padding: 20px; }

/* Invoice editor */
.invoice-edit .row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 12px; }
.invoice-edit label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.invoice-edit label.wide { grid-column: 1 / -1; }
table.items { width: 100%; border-collapse: collapse; margin-bottom: 8px; }
table.items th { text-align: left; font-size: 12px; color: var(--muted); padding: 6px 8px; text-transform: uppercase; letter-spacing: 0.05em; }
table.items th.r { text-align: right; }
table.items td { padding: 4px 6px; }
table.items td.r { text-align: right; font-variant-numeric: tabular-nums; }
table.items input { padding: 6px 8px; }

.totals { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 16px 0; justify-content: end; max-width: 320px; margin-left: auto; }
.totals > div { display: contents; }
.totals > div > span { color: var(--muted); font-size: 13px; }
.totals > div > strong { text-align: right; font-variant-numeric: tabular-nums; }
.totals > div > input { width: 100px; justify-self: end; padding: 4px 8px; }
.totals .grand > strong { font-size: 18px; color: var(--accent); }
.totals .tax-row { display: grid; grid-template-columns: 1fr 80px auto; gap: 6px; grid-column: 1 / -1; align-items: center; }
.totals .tax-row input, .totals .tax-row select { padding: 4px 8px; }
.totals .tax-add { grid-column: 1 / -1; text-align: right; margin-bottom: 4px; }

.tax-rates-editor { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.tax-rates-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.tax-rate-row { display: grid; grid-template-columns: 1fr 100px auto; gap: 8px; align-items: center; }

.terms-editor { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.terms-md-editor { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.terms-md-editor textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; line-height: 1.5; min-height: 280px; }
.terms-md-preview {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
  overflow: auto;
  max-height: 360px;
}
.terms-md-preview h1 { font-size: 18px; margin: 0 0 8px; color: var(--text); text-transform: none; letter-spacing: 0; }
.terms-md-preview h2 { font-size: 15px; margin: 12px 0 6px; color: var(--text); text-transform: none; letter-spacing: 0; }
.terms-md-preview h3 { font-size: 13px; margin: 10px 0 4px; color: var(--text); text-transform: none; letter-spacing: 0; }
.terms-md-preview p { margin: 0 0 8px; }
.terms-md-preview ul, .terms-md-preview ol { margin: 0 0 8px; padding-left: 22px; }
.terms-md-preview code { background: rgba(138, 146, 163, 0.15); padding: 1px 4px; border-radius: 3px; font-size: 12px; }
.terms-md-preview em { color: var(--muted); font-style: italic; }
@media (max-width: 720px) {
  .terms-md-editor { grid-template-columns: 1fr; }
}

.invoice-edit label.mixed-toggle { flex-direction: row; align-items: center; gap: 8px; margin-top: 8px; color: var(--muted); font-size: 13px; cursor: pointer; }
.mixed-toggle input { width: auto; margin: 0; }
.mixed-toggle em { font-style: normal; opacity: 0.8; }

table.items th.tax-col, table.items td.tax-col { min-width: 140px; }
table.items th.desc-col, table.items td.desc-col { width: auto; }
table.items td.desc-col input { width: 100%; }
table.items th.qty-col, table.items td.qty-col { width: 90px; }
table.items td.qty-col input { width: 100%; text-align: right; }
table.items th.price-col, table.items td.price-col { width: 110px; }
table.items td.price-col input { width: 100%; text-align: right; }
table.items select { padding: 6px 8px; }

.info-grid { display: grid; grid-template-columns: 220px 1fr; gap: 12px 24px; margin: 0; }
.info-grid dt { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; margin: 0; align-self: center; }
.info-grid dd { margin: 0; font-size: 15px; }

.share-banner { background: rgba(94, 227, 161, 0.08); border: 1px solid rgba(94, 227, 161, 0.4); border-radius: 8px; padding: 12px 16px; margin-bottom: 20px; }
.share-banner strong { display: block; margin-bottom: 4px; }
.share-banner p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }

.actions { display: flex; gap: 8px; align-items: center; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.actions .flex { flex: 1; }

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--panel); border: 1px solid var(--border); padding: 10px 16px;
  border-radius: 8px; font-size: 14px; z-index: 200;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.site-footer {
  flex-shrink: 0;
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}
.site-footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dotted rgba(138, 146, 163, 0.4);
}
.site-footer a:hover {
  color: var(--text);
  border-bottom-color: var(--text);
}

@media (max-width: 640px) {
  .app-header { flex-wrap: wrap; }
  .panel { padding: 16px; }
  table.data { font-size: 13px; }
  table.data th, table.data td { padding: 8px 10px; }
}