:root {
  --ink: #0f2438;
  --ink-soft: #4a5f74;
  --paper: #f5f7f8;
  --panel: #ffffff;
  --line: #dde4e8;
  --teal: #0e7c86;
  --teal-dark: #0a5c64;
  --aqua: #cdeef0;
  --amber: #c47f17;
  --amber-bg: #fdf3e2;
  --red: #b3392f;
  --red-bg: #fbe9e7;
  --green: #2c7a4b;
  --green-bg: #e7f5ec;
  --mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.5;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* Sidebar */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--ink);
  color: #cfe3e8;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar-brand {
  padding: 20px 18px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.brand-title { display: block; font-weight: 700; font-size: 16px; color: #fff; letter-spacing: 0.02em; }
.brand-sub { display: block; font-size: 11px; color: #7fa3ac; margin-top: 2px; }
.sidebar-nav { padding: 10px 0; flex: 1; overflow-y: auto; }
.sidebar-nav a {
  display: block;
  padding: 9px 18px;
  color: #b9d2d8;
  font-size: 13.5px;
  border-left: 3px solid transparent;
}
.sidebar-nav a:hover { background: rgba(255,255,255,0.06); text-decoration: none; color: #fff; }
.sidebar-nav a.active { background: rgba(14,124,134,0.35); border-left-color: var(--teal); color: #fff; font-weight: 600; }
.nav-group-label {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #5d7e87;
  padding: 14px 18px 4px;
}

/* Main area */
.main-area { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: 14px 24px;
  position: sticky;
  top: 0;
  z-index: 5;
}
.hamburger { display: none; background: none; border: none; font-size: 20px; cursor: pointer; }
.topbar-title { font-weight: 700; font-size: 17px; flex: 1; }
.topbar-user { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--ink-soft); }
.btn-logout {
  background: var(--red-bg); color: var(--red); padding: 5px 12px; border-radius: 6px; font-weight: 600; font-size: 12.5px;
}
.btn-logout:hover { text-decoration: none; opacity: 0.85; }

.content { padding: 24px; flex: 1; }
.app-footer { text-align: center; font-size: 12px; color: var(--ink-soft); padding: 16px; border-top: 1px solid var(--line); }

/* Cards */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.card-title { font-size: 15px; font-weight: 700; margin: 0 0 14px; color: var(--ink); }

/* KPI grid */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.kpi-card { background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--teal); border-radius: 8px; padding: 16px 18px; }
.kpi-label { font-size: 12px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.04em; }
.kpi-value { font-family: var(--mono); font-size: 24px; font-weight: 700; margin-top: 6px; color: var(--ink); }
.kpi-sub { font-size: 12px; color: var(--ink-soft); margin-top: 4px; }

/* Forms */
.form-row { margin-bottom: 14px; }
.form-row label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; color: var(--ink); }
.form-row .hint { font-size: 11.5px; color: var(--ink-soft); margin-top: 4px; }
input[type=text], input[type=number], input[type=date], input[type=password],
input[type=month], select, textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 13.5px;
  font-family: var(--sans);
  background: #fff;
  color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--teal); outline-offset: 1px; border-color: var(--teal); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 700px) { .form-grid { grid-template-columns: 1fr; } }

.btn {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 7px;
  font-weight: 600;
  font-size: 13.5px;
  border: none;
  cursor: pointer;
  font-family: var(--sans);
}
.btn-primary { background: var(--teal); color: #fff; }
.btn-primary:hover { background: var(--teal-dark); text-decoration: none; }
.btn-secondary { background: #eef2f3; color: var(--ink); }
.btn-secondary:hover { background: #e2e8ea; text-decoration: none; }
.btn-danger { background: var(--red-bg); color: var(--red); }
.btn-sm { padding: 5px 11px; font-size: 12px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  background: #eef3f4;
  color: var(--ink);
  font-weight: 700;
  text-align: left;
  padding: 10px 12px;
  border-bottom: 2px solid var(--line);
  white-space: nowrap;
}
tbody td { padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:hover { background: #f8fafb; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.num { font-family: var(--mono); text-align: right; white-space: nowrap; }
.row-in { color: var(--green); }
.row-out { color: var(--red); }
.row-group-header td { background: var(--ink); color: #fff; font-weight: 700; }
.row-total td { background: #eef3f4; font-weight: 700; border-top: 2px solid var(--line); }
.row-opening td { background: var(--aqua); font-weight: 600; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11px; font-weight: 700; }
.badge-in { background: var(--green-bg); color: var(--green); }
.badge-out { background: var(--red-bg); color: var(--red); }
.badge-warn { background: var(--amber-bg); color: var(--amber); }

/* Filter bar */
.filter-bar { display: flex; gap: 12px; align-items: end; flex-wrap: wrap; margin-bottom: 18px; }
.filter-bar .form-row { margin-bottom: 0; min-width: 160px; }

/* Alerts */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-size: 13.5px; font-weight: 500; }
.alert-success { background: var(--green-bg); color: var(--green); border: 1px solid #b9dfc6; }
.alert-danger { background: var(--red-bg); color: var(--red); border: 1px solid #eec2bd; }

/* Login page */
.login-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(160deg, #0f2438 0%, #0a5c64 100%); }
.login-card { background: #fff; border-radius: 14px; padding: 36px 34px; width: 100%; max-width: 380px; box-shadow: 0 20px 60px rgba(0,0,0,0.25); }
.login-brand { text-align: center; margin-bottom: 24px; }
.login-brand .drop { font-size: 34px; }
.login-brand h1 { font-size: 17px; margin: 8px 0 2px; color: var(--ink); }
.login-brand p { font-size: 12px; color: var(--ink-soft); margin: 0; }
.login-card .btn-primary { width: 100%; margin-top: 8px; }

@media (max-width: 860px) {
  .sidebar { position: fixed; left: -240px; z-index: 20; transition: left 0.2s; }
  .app-shell.sidebar-open .sidebar { left: 0; }
  .hamburger { display: block; }
}