:root {
  --color-bg: #f4f5f7;
  --color-surface: #ffffff;
  --color-border: #e2e4e9;
  --color-text: #1c1f26;
  --color-text-muted: #6b7280;
  --color-primary: #3457d5;
  --color-primary-hover: #2a44ab;
  --color-danger: #c0392b;
  --color-danger-bg: #fdecea;
  --color-success: #1e824c;
  --color-success-bg: #e8f7ee;
  --sidebar-width: 220px;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161c;
    --color-surface: #1c1f27;
    --color-border: #2c2f3a;
    --color-text: #e7e9ee;
    --color-text-muted: #9aa0ac;
    --color-primary: #6d8bff;
    --color-primary-hover: #8ba0ff;
    --color-danger: #f27167;
    --color-danger-bg: #3a1f1d;
    --color-success: #4fd18b;
    --color-success-bg: #163726;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.5;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  margin: 0 0 0.5em;
  font-weight: 600;
}

/* App shell */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  padding: 20px 0;
}

.sidebar-brand {
  font-weight: 700;
  font-size: 1.2rem;
  padding: 0 20px 20px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
}

.sidebar-nav a {
  color: var(--color-text-muted);
  padding: 10px 20px;
  font-weight: 500;
}

.sidebar-nav a:hover {
  background: var(--color-bg);
  text-decoration: none;
}

.sidebar-nav a.active {
  color: var(--color-primary);
  background: var(--color-bg);
  border-right: 3px solid var(--color-primary);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.topbar-title {
  font-weight: 600;
  font-size: 1.1rem;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.content {
  padding: 28px;
  max-width: 1100px;
  width: 100%;
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
}

.grid {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}

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

@media (max-width: 800px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-label {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
}

/* Forms */
.auth-form,
form.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"],
select,
textarea {
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 12px;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.btn {
  display: inline-block;
  border: none;
  border-radius: 6px;
  padding: 10px 18px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff !important;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.92rem;
}

.table th {
  color: var(--color-text-muted);
  font-weight: 600;
}

/* Flash messages */
.flash {
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 0.92rem;
}

.flash-success {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.flash-error {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.form-error {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 0.9rem;
}

/* Shared list/detail page bits */
.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-header-row h1,
.card-header-row h2 {
  margin: 0;
}

.inline-form {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.inline-form input[type="text"],
.inline-form input[type="date"],
.inline-form select {
  width: auto;
}

.checkbox-label {
  flex-direction: row;
  align-items: center;
  gap: 6px;
  font-weight: 400;
}

.empty-state {
  color: var(--color-text-muted);
  padding: 20px 0;
}

.status-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-bg);
  color: var(--color-text-muted);
}

.status-active,
.status-paid,
.status-done {
  color: var(--color-success);
}

.status-archived,
.status-void,
.status-disabled {
  color: var(--color-text-muted);
}

.status-overdue,
.status-high {
  color: var(--color-danger);
}

.status-draft,
.status-todo {
  color: var(--color-text-muted);
}

.status-sent,
.status-in_progress,
.status-medium {
  color: var(--color-primary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.actions-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 160px 1fr;
  row-gap: 10px;
  column-gap: 12px;
  font-size: 0.92rem;
}

.detail-grid dt {
  color: var(--color-text-muted);
  font-weight: 500;
}

.detail-grid dd {
  margin: 0;
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* Role badges */
.role-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--color-bg);
  color: var(--color-text-muted);
}

.role-owner {
  color: var(--color-primary);
}

.role-admin {
  color: var(--color-success);
}

/* Auth pages (login/register/reset) */
.auth-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}

.auth-brand {
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.auth-links {
  margin-top: 18px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  text-align: center;
}