:root {
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-border: #e2e5ea;
  --color-text: #1a2233;
  --color-text-muted: #667085;
  --color-primary: #0f766e;
  --color-primary-dark: #0c5b55;
  --color-primary-light: #e6f4f2;
  --color-danger: #dc2626;
  --color-danger-light: #fdecec;
  --color-warning: #b45309;
  --color-warning-light: #fef3e2;
  --color-success: #15803d;
  --color-success-light: #e7f6ec;
  --color-info: #1d4ed8;
  --color-info-light: #e8eefc;
  --sidebar-bg: #121a2b;
  --sidebar-text: #aab4c8;
  --sidebar-active: #1c2b45;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
}

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

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

.sidebar {
  width: 220px; flex-shrink: 0; background: var(--sidebar-bg); color: var(--sidebar-text);
  display: flex; flex-direction: column; padding: 16px 0; position: sticky; top: 0; height: 100vh;
}

.sidebar-brand {
  font-size: 16px; font-weight: 700; color: #fff; padding: 0 20px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08); margin-bottom: 8px;
}
.sidebar-brand small { display: block; font-weight: 400; font-size: 11px; color: var(--sidebar-text); margin-top: 2px; }
.sidebar nav { flex: 1; overflow-y: auto; }
.sidebar-section { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: #5c6a85; padding: 14px 20px 6px; }
.sidebar a.nav-link { display: flex; align-items: center; gap: 10px; padding: 9px 20px; color: var(--sidebar-text); font-size: 13.5px; border-left: 3px solid transparent; }
.sidebar a.nav-link:hover { background: rgba(255, 255, 255, 0.04); color: #fff; }
.sidebar a.nav-link.active { background: var(--sidebar-active); color: #fff; border-left-color: var(--color-primary); }

.main-area { flex: 1; padding: 28px 32px 60px; min-width: 0; }

.page-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 20px; gap: 16px; flex-wrap: wrap; }
.page-header h1 { font-size: 22px; margin: 0 0 4px; }
.page-header p.subtitle { margin: 0; color: var(--color-text-muted); font-size: 13px; }
.page-actions { display: flex; gap: 8px; flex-shrink: 0; }

.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); box-shadow: var(--shadow-sm); overflow-x: auto; -webkit-overflow-scrolling: touch; }
.card-pad { padding: 20px; }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.kpi-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow-sm); }
.kpi-card .kpi-label { font-size: 12px; color: var(--color-text-muted); margin-bottom: 6px; }
.kpi-card .kpi-value { font-size: 22px; font-weight: 700; }
.kpi-card .kpi-sub { font-size: 11.5px; color: var(--color-text-muted); margin-top: 4px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; padding: 8px 14px;
  border-radius: var(--radius); border: 1px solid transparent; cursor: pointer; background: var(--color-surface);
  color: var(--color-text); border-color: var(--color-border); transition: background 0.12s; font-family: inherit;
}
.btn:hover { background: #f0f1f3; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-danger { background: var(--color-danger-light); color: var(--color-danger); border-color: transparent; }
.btn-danger:hover { background: #fbdada; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-link { background: transparent; border: none; color: var(--color-primary); padding: 4px 2px; cursor: pointer; font-size: 13px; font-family: inherit; }
.btn-link:hover { text-decoration: underline; background: transparent; }

table.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data-table th { text-align: left; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--color-text-muted); padding: 10px 14px; border-bottom: 1px solid var(--color-border); white-space: nowrap; }
table.data-table td { padding: 11px 14px; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
table.data-table tbody tr:hover { background: #fafbfc; }
table.data-table tbody tr.clickable { cursor: pointer; }

.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-mono { font-family: 'Consolas', monospace; }
.empty-state { padding: 48px 20px; text-align: center; color: var(--color-text-muted); }

.badge { display: inline-flex; align-items: center; font-size: 11.5px; font-weight: 600; padding: 3px 9px; border-radius: 999px; white-space: nowrap; }
.badge-gray { background: #eceef1; color: #475569; }
.badge-success { background: var(--color-success-light); color: var(--color-success); }
.badge-warning { background: var(--color-warning-light); color: var(--color-warning); }
.badge-danger { background: var(--color-danger-light); color: var(--color-danger); }
.badge-info { background: var(--color-info-light); color: var(--color-info); }

.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 16px; }
.form-grid.cols-1 { grid-template-columns: 1fr; }
.form-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.field { display: flex; flex-direction: column; gap: 5px; }
.field.span-2 { grid-column: span 2; }
.field label { font-size: 12.5px; font-weight: 600; color: #344054; }
.field .hint { font-size: 11.5px; color: var(--color-text-muted); }

input, select, textarea {
  font-family: inherit; font-size: 13.5px; padding: 8px 10px; border: 1px solid var(--color-border);
  border-radius: 6px; background: #fff; color: var(--color-text); width: 100%;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary-light); }
input[type='checkbox'] { width: auto; margin-right: 6px; }
input[type='color'] { padding: 2px; height: 38px; width: 50px; }
textarea { resize: vertical; }

.card-form { max-width: 900px; }

.items-editor { border: 1px solid var(--color-border); border-radius: 8px; overflow: hidden; }
.items-editor-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.items-editor-row { display: grid; grid-template-columns: 2.4fr 0.8fr 0.7fr 1fr 0.7fr 0.9fr 32px; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--color-border); align-items: center; min-width: 640px; }
.items-editor-row.header { background: #f8f9fb; font-size: 11px; text-transform: uppercase; color: var(--color-text-muted); }
.items-editor-row:last-child { border-bottom: none; }
.items-editor input, .items-editor select { padding: 6px 8px; font-size: 13px; }

.totals-box { margin-top: 14px; margin-left: auto; width: 280px; display: flex; flex-direction: column; gap: 6px; }
.totals-row { display: flex; justify-content: space-between; font-size: 13.5px; }
.totals-row.total { font-size: 16px; font-weight: 700; border-top: 1px solid var(--color-border); padding-top: 8px; }

.banner { padding: 10px 14px; border-radius: 8px; font-size: 13px; margin-bottom: 16px; }
.banner-info { background: var(--color-info-light); color: var(--color-info); }
.banner-warning { background: var(--color-warning-light); color: var(--color-warning); }
.banner-danger, .banner-error { background: var(--color-danger-light); color: var(--color-danger); }
.banner-success { background: var(--color-success-light); color: var(--color-success); }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--color-border); margin-bottom: 18px; }
.tab-btn { padding: 9px 16px; font-size: 13.5px; font-weight: 600; color: var(--color-text-muted); border: none; background: none; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; text-decoration: none; display: inline-block; }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.toolbar input[type='search'], .toolbar input[type='text'] { min-width: 220px; width: auto; }
.toolbar select { width: auto; }
.spacer { flex: 1; }

/* ---- Login ---- */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--sidebar-bg); padding: 20px; }
.login-box { background: var(--color-surface); border-radius: 12px; padding: 36px; width: 100%; max-width: 380px; box-shadow: var(--shadow-md); }
.login-box h1 { font-size: 20px; margin: 0 0 4px; }
.login-box p { color: var(--color-text-muted); font-size: 13px; margin: 0 0 20px; }
.login-box .field { margin-bottom: 14px; }
.login-box .btn-primary { width: 100%; justify-content: center; padding: 10px; }

/* ---- Mobile topbar / off-canvas sidebar ---- */
.mobile-topbar { display: none; }
.sidebar-overlay { display: none; }

@media (max-width: 880px) {
  .app-shell { display: block; }

  .mobile-topbar {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    background: var(--sidebar-bg); color: #fff; padding: 12px 16px;
    position: sticky; top: 0; z-index: 30;
  }
  .mobile-topbar-brand { font-weight: 700; font-size: 15px; }
  .sidebar-toggle {
    background: none; border: none; color: #fff; font-size: 20px; line-height: 1;
    cursor: pointer; padding: 6px 8px; border-radius: 6px;
  }
  .sidebar-toggle:hover { background: rgba(255, 255, 255, 0.08); }

  .sidebar {
    position: fixed; top: 0; left: 0; z-index: 50; width: 260px; max-width: 82vw;
    transform: translateX(-100%); transition: transform 0.2s ease-out;
  }
  .sidebar.open { transform: translateX(0); }

  .sidebar-overlay {
    position: fixed; inset: 0; background: rgba(15, 20, 32, 0.5); z-index: 40;
  }
  .sidebar-overlay.open { display: block; }

  .main-area { padding: 18px 16px 48px; }
}

@media (max-width: 640px) {
  .form-grid, .form-grid.cols-3 { grid-template-columns: 1fr; }
  .field.span-2 { grid-column: span 1; }
  .page-header { flex-direction: column; align-items: stretch; }
  .page-actions { flex-wrap: wrap; }
  .toolbar input[type='search'], .toolbar input[type='text'] { min-width: 0; width: 100%; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .totals-box { width: 100%; }
  table.data-table th, table.data-table td { padding: 9px 10px; }
}

@media (max-width: 420px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .login-box { padding: 24px; }
}