:root {
  --bg: #f5f7f8;
  --surface: #ffffff;
  --surface-strong: #eef6f4;
  --text: #1e262b;
  --muted: #65737b;
  --border: #dce4e7;
  --primary: #0f8f7c;
  --primary-dark: #0a6e61;
  --blue: #2563eb;
  --amber: #b7791f;
  --red: #c2413b;
  --green: #168a4a;
  --shadow: 0 12px 28px rgba(28, 45, 51, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.45;
}

a {
  color: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 240px 1fr;
}

.sidebar {
  background: #172126;
  color: #f8fbfb;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.brand {
  display: grid;
  gap: 5px;
}

.brand strong {
  font-size: 18px;
}

.brand span {
  color: #b9c7cc;
  font-size: 13px;
}

.nav {
  display: grid;
  gap: 8px;
}

.nav a {
  border-radius: var(--radius);
  color: #e8eff1;
  padding: 12px;
  text-decoration: none;
}

.nav a.active,
.nav a:hover {
  background: rgba(255, 255, 255, 0.1);
}

.main {
  padding: 26px;
  max-width: 1180px;
  width: 100%;
}

.topbar {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.topbar h1,
.page-title h1 {
  font-size: 28px;
  line-height: 1.1;
  margin: 0;
}

.topbar p,
.page-title p {
  color: var(--muted);
  margin: 5px 0 0;
}

.grid {
  display: grid;
  gap: 16px;
}

.dashboard-grid {
  grid-template-columns: 1.1fr 0.9fr;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.panel,
.stat,
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel {
  padding: 18px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-header h2,
.panel h2 {
  font-size: 18px;
  margin: 0;
}

.stat {
  padding: 16px;
}

.stat span {
  color: var(--muted);
  display: block;
  font-size: 13px;
}

.stat strong {
  display: block;
  font-size: 24px;
  margin-top: 6px;
}

.quick-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.quick-action {
  align-items: center;
  background: var(--surface-strong);
  border: 1px solid #cbe5df;
  border-radius: var(--radius);
  display: flex;
  gap: 12px;
  min-height: 86px;
  padding: 16px;
  text-decoration: none;
}

.quick-action strong {
  display: block;
  font-size: 18px;
}

.quick-action > span:not(.quick-icon) {
  color: var(--muted);
  display: block;
  font-size: 13px;
}

.quick-action > span:not(.quick-icon) span {
  color: var(--muted);
  display: block;
  font-size: 13px;
}

.quick-icon {
  align-items: center;
  background: var(--primary);
  border-radius: 50%;
  color: white;
  display: inline-flex;
  flex: 0 0 42px;
  font-size: 26px;
  height: 42px;
  justify-content: center;
  width: 42px;
}

.quick-action .quick-icon {
  display: inline-flex;
}

.button,
button,
input[type="submit"] {
  align-items: center;
  background: var(--primary);
  border: 0;
  border-radius: var(--radius);
  color: white;
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  gap: 8px;
  min-height: 42px;
  justify-content: center;
  padding: 10px 14px;
  text-decoration: none;
}

.button:hover,
button:hover,
input[type="submit"]:hover {
  background: var(--primary-dark);
}

.button.secondary {
  background: #e8eef0;
  color: var(--text);
}

.button.secondary:hover {
  background: #d8e2e5;
}

.button.danger,
.icon-button.danger {
  background: #f8dedb;
  color: var(--red);
}

.button.blue {
  background: var(--blue);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.icon-button {
  min-width: 42px;
  padding: 0;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 12px 8px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.status {
  border-radius: 999px;
  display: inline-flex;
  font-size: 12px;
  font-weight: 700;
  padding: 5px 9px;
  text-transform: uppercase;
}

.status.draft,
.status.sent {
  background: #e8eef0;
  color: #52636b;
}

.status.unpaid,
.status.pending,
.status.part-paid {
  background: #fff3d8;
  color: var(--amber);
}

.status.paid,
.status.accepted {
  background: #ddf6e8;
  color: var(--green);
}

.status.cancelled,
.status.declined,
.status.overdue {
  background: #fbe2df;
  color: var(--red);
}

form {
  display: grid;
  gap: 16px;
}

.form-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
  display: grid;
  gap: 6px;
}

label span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input,
select,
textarea {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
  min-height: 43px;
  padding: 10px 11px;
  width: 100%;
}

textarea {
  resize: vertical;
}

.line-items {
  display: grid;
  gap: 10px;
}

.line-item {
  align-items: end;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 90px 130px 42px;
  padding: 12px;
}

.panel-lite {
  background: #f8fafb;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}

.panel-lite summary {
  cursor: pointer;
  font-weight: 700;
}

.panel-lite .form-grid {
  margin-top: 12px;
}

.total-preview {
  background: #172126;
  border-radius: var(--radius);
  color: white;
  display: flex;
  justify-content: space-between;
  padding: 16px;
}

.empty {
  color: var(--muted);
  padding: 22px 0;
}

.flash {
  background: #ddf6e8;
  border: 1px solid #a7dfbf;
  border-radius: var(--radius);
  color: var(--green);
  margin-bottom: 16px;
  padding: 12px 14px;
}

.auth-page {
  align-items: center;
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: 18px;
}

.auth-card {
  max-width: 480px;
  padding: 24px;
  width: 100%;
}

.auth-card h1 {
  margin: 0 0 8px;
}

.auth-card p {
  color: var(--muted);
  margin-top: 0;
}

.document-preview {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.document-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}

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

@media (max-width: 860px) {
  .app-shell {
    display: block;
  }

  .sidebar {
    padding: 14px;
    position: sticky;
    top: 0;
    z-index: 10;
  }

  .brand {
    display: none;
  }

  .nav {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav a {
    flex: 0 0 auto;
    padding: 10px 12px;
    white-space: nowrap;
  }

  .main {
    padding: 18px 14px 90px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .dashboard-grid,
  .stats-grid,
  .form-grid,
  .quick-actions {
    grid-template-columns: 1fr;
  }

  .quick-action {
    min-height: 78px;
  }

  .line-item {
    grid-template-columns: 1fr 1fr;
  }

  .line-item label:first-child {
    grid-column: 1 / -1;
  }

  .line-item .icon-button {
    grid-column: 1 / -1;
    width: 100%;
  }

  th.optional,
  td.optional {
    display: none;
  }
}

@media print {
  .sidebar,
  .topbar,
  .button-row,
  .flash {
    display: none !important;
  }

  .app-shell,
  .main {
    display: block;
    padding: 0;
    max-width: none;
  }

  body {
    background: white;
  }

  .document-preview {
    border: 0;
    box-shadow: none;
  }
}