/* ── Custom Properties ─────────────────────────────────────────────── */
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --card: #22253a;
  --border: #2e3348;
  --text: #e8eaf0;
  --muted: #7a8099;
  --accent: #4f8cff;
  --accent-hover: #3a75e6;
  --success: #4caf82;
  --warning: #e6a23c;
  --danger: #cf6679;
  --radius: 8px;
  --sidebar-w: 240px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ── Reset ────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Shell Layout ─────────────────────────────────────────────────── */
.shell {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}
.sidebar__brand {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}
.sidebar__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  font-weight: 700;
  font-size: 18px;
  font-family: var(--mono);
}
.sidebar__title {
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.3px;
}
.sidebar__nav {
  flex: 1;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-item {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.nav-item:hover {
  background: var(--card);
  color: var(--text);
  text-decoration: none;
}
.nav-item.active {
  background: var(--accent);
  color: #fff;
}
.sidebar__user {
  padding: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.sidebar__username {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}
.sidebar__logout {
  font-size: 13px;
  color: var(--danger);
}

/* ── Main Content ─────────────────────────────────────────────────── */
.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: 32px 40px;
  max-width: 1200px;
}

/* ── Public Layout ────────────────────────────────────────────────── */
.public {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.public__container {
  width: 100%;
  max-width: 960px;
  padding: 40px 20px 60px;
}
.public__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-bottom: 32px;
}
.public__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 22px;
  font-family: var(--mono);
}
.public__title {
  font-weight: 700;
  font-size: 22px;
}

/* ── Page Header ──────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.page-header--sub {
  margin-top: 40px;
}
.page-header__title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.page-header--sub .page-header__title {
  font-size: 18px;
}

/* ── Flash Messages ───────────────────────────────────────────────── */
.flash {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  font-size: 14px;
  font-weight: 500;
  animation: flashIn 0.3s ease;
}
.flash--success { background: rgba(76,175,130,0.15); color: var(--success); border: 1px solid rgba(76,175,130,0.3); }
.flash--error   { background: rgba(207,102,121,0.15); color: var(--danger);  border: 1px solid rgba(207,102,121,0.3); }
.flash--info    { background: rgba(79,140,255,0.15);  color: var(--accent);  border: 1px solid rgba(79,140,255,0.3); }
@keyframes flashIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* ── Stats Grid ───────────────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stat-card__label {
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.stat-card__value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.stat-card__value--mono { font-family: var(--mono); font-size: 24px; }
.stat-card__value--danger { color: var(--danger); }
.stat-card__value--warning { color: var(--warning); }

/* ── Quick Actions ────────────────────────────────────────────────── */
.quick-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── Buttons ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: background 0.15s, opacity 0.15s;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: var(--accent-hover); }
.btn--danger {
  background: var(--danger);
  color: #fff;
}
.btn--danger:hover { opacity: 0.85; }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--ghost:hover { background: var(--card); }
.btn--block { width: 100%; }

/* ── Data Tables ──────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.data-table th {
  text-align: left;
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.data-table tbody tr:hover { background: var(--card); }
.data-table__row--link { cursor: pointer; }
.data-table__empty {
  text-align: center;
  color: var(--muted);
  padding: 40px 14px !important;
}
.data-table__details {
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.mono { font-family: var(--mono); font-size: 13px; }

/* ── Badges ───────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  background: var(--card);
  color: var(--muted);
  border: 1px solid var(--border);
}
.badge--draft    { background: rgba(122,128,153,0.15); color: var(--muted); }
.badge--sent     { background: rgba(79,140,255,0.15);  color: var(--accent); }
.badge--paid     { background: rgba(76,175,130,0.15);  color: var(--success); }
.badge--overdue  { background: rgba(207,102,121,0.15); color: var(--danger); }
.badge--pending  { background: rgba(230,162,60,0.15);  color: var(--warning); }
.badge--synced   { background: rgba(76,175,130,0.15);  color: var(--success); }
.badge--failed   { background: rgba(207,102,121,0.15); color: var(--danger); }
.badge--active   { background: rgba(76,175,130,0.15);  color: var(--success); }
.badge--inactive { background: rgba(122,128,153,0.15); color: var(--muted); }
.badge--approved { background: rgba(76,175,130,0.15);  color: var(--success); }
.badge--rejected { background: rgba(207,102,121,0.15); color: var(--danger); }
.badge--healthy  { background: rgba(76,175,130,0.15);  color: var(--success); }

/* ── Detail Card ──────────────────────────────────────────────────── */
.detail-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}
.detail-card__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.detail-card__label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  margin-bottom: 4px;
}
.detail-card__value {
  font-size: 15px;
  font-weight: 500;
}

/* ── Integration Card ─────────────────────────────────────────────── */
.integration-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.integration-card__header {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.integration-card__title {
  font-size: 16px;
  font-weight: 600;
}
.integration-card__body { padding: 24px; }
.integration-card__desc {
  color: var(--muted);
  margin-bottom: 16px;
  font-size: 14px;
}
.integration-card__actions {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* ── Login Card ───────────────────────────────────────────────────── */
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  max-width: 420px;
  margin: 0 auto;
}
.login-card__title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}
.login-card__desc {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}
.login-card__dev {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ── Hero ─────────────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 60px 20px 40px;
}
.hero__title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}
.hero__subtitle {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ── Features Grid ────────────────────────────────────────────────── */
.features { padding: 20px 0 60px; }
.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Empty State ──────────────────────────────────────────────────── */
.empty-state {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* ── Error Page ───────────────────────────────────────────────────── */
.error-page { text-align: center; padding: 80px 20px; }
.error-page__code {
  font-size: 72px;
  font-weight: 800;
  color: var(--muted);
  letter-spacing: -2px;
}
.error-page__message {
  color: var(--muted);
  margin: 12px 0 32px;
  font-size: 16px;
}

/* ── Forms ─────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.form-input,
.form-select {
  width: 100%;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  transition: border-color 0.15s;
}
.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent);
}
.role-select {
  padding: 4px 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
}

/* ── Form Layouts ─────────────────────────────────────────────────── */
.form-row { display: flex; gap: 16px; }
.form-group--half { flex: 1; }
.form-group--wide { flex: 3; }
.form-group--narrow { flex: 1; }
.form-group--action { flex: 0 0 auto; display: flex; align-items: flex-end; padding-bottom: 16px; }
.form-actions { display: flex; gap: 12px; margin-top: 24px; }
.form-textarea { resize: vertical; min-height: 80px; }

/* ── Invoice Totals ──────────────────────────────────────────────── */
.invoice-totals { margin-top: 24px; max-width: 320px; margin-left: auto; }
.invoice-totals__row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; color: var(--muted); }
.invoice-totals__row--total { font-size: 18px; font-weight: 700; color: var(--text); border-bottom: 2px solid var(--accent); }

/* ── Line Items ──────────────────────────────────────────────────── */
.line-item { margin-bottom: 8px; }
.line-item + .line-item { padding-top: 8px; border-top: 1px solid var(--border); }

/* ── Small Buttons ───────────────────────────────────────────────── */
.btn--sm { padding: 6px 12px; font-size: 13px; }

/* ── Paper Invoice Badge ─────────────────────────────────────────── */
.badge--paper { background: rgba(230,162,60,0.15); color: var(--warning); border-color: rgba(230,162,60,0.3); }

/* ── Detail Card Variants ────────────────────────────────────────── */
.detail-card--paper { border-left: 3px solid var(--warning); }
.detail-card__header { font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--warning); margin-bottom: 16px; }

/* ── Page Header Actions ─────────────────────────────────────────── */
.page-header__actions { display: flex; align-items: center; gap: 8px; }

/* ── Print Styles ────────────────────────────────────────────────── */
@media print {
  .sidebar, .page-header__actions .btn, .flash { display: none !important; }
  .main { margin-left: 0; padding: 20px; }
  body { background: #fff; color: #000; }
  .detail-card, .data-table { border-color: #ccc; }
  .badge { border: 1px solid #999; background: none; color: #333; }
  .invoice-totals__row--total { border-color: #000; }
}

/* ── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -var(--sidebar-w);
    transition: left 0.2s;
  }
  .sidebar.open { left: 0; }
  .main {
    margin-left: 0;
    padding: 20px 16px;
  }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features__grid { grid-template-columns: 1fr; }
  .hero__title { font-size: 26px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
}