/* =========================================================
   Sales & Purchase System - Blue / White Modern Theme
   ========================================================= */
:root {
  --primary: #1d5fd6;
  --primary-dark: #123f94;
  --primary-light: #eaf1fd;
  --accent: #38bdf8;
  --bg: #f4f7fc;
  --white: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --radius: 10px;
  --shadow: 0 4px 16px rgba(29, 95, 214, 0.08);
  --shadow-lg: 0 10px 30px rgba(29, 95, 214, 0.15);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Layout shells ---------- */
.center-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

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

.sidebar {
  width: 250px;
  background: var(--white);
  border-right: 1px solid var(--border);
  padding: 0 0 20px;
  flex-shrink: 0;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 20px 12px 16px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}

.sidebar .brand {
  font-size: 19px;
  font-weight: 700;
  color: var(--primary-dark);
  line-height: 1.3;
}

.sidebar .brand span { color: var(--accent); }

.sidebar-close {
  display: none;
  align-items: center;
  justify-content: center;
  background: #eef4ff;
  color: var(--primary-dark);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: inset 0 0 0 1px rgba(29, 95, 214, 0.08);
}

.sidebar-close:hover { background: #dbeafe; box-shadow: inset 0 0 0 1px rgba(29, 95, 214, 0.14); }
.sidebar-close:active { transform: scale(0.92); }

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 0 12px;
  flex: 1;
}

.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  color: #475569;
  font-weight: 500;
  font-size: 14px;
  border-radius: 8px;
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}

.sidebar nav a:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateX(2px);
}

.sidebar nav a.active {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  border-left-color: var(--primary-dark);
  box-shadow: 0 4px 10px rgba(29,95,214,0.25);
}

.sidebar nav a.nav-logout {
  margin-top: 10px;
  color: var(--danger);
  border-top: 1px solid var(--border);
  padding-top: 14px;
  border-radius: 0;
}

.sidebar nav a.nav-logout:hover {
  background: #fee2e2;
  color: var(--danger);
  transform: translateX(2px);
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  z-index: 90;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.sidebar-backdrop.open {
  display: block;
  opacity: 1;
}

.main-content { flex: 1; padding: 24px; max-width: 100%; overflow-x: auto; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
  flex-wrap: wrap;
  gap: 10px;
}

.topbar h1 { font-size: 22px; margin: 0; color: var(--primary-dark); }

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: 999px;
  width: 42px;
  height: 42px;
  padding: 0;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(29, 95, 214, 0.18);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.menu-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 26px rgba(29, 95, 214, 0.22);
}

.menu-toggle:active { transform: scale(0.96); }


/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 20px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 22px;
}

.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
}

.stat-card .label { color: var(--text-muted); font-size: 13px; }
.stat-card .value { font-size: 26px; font-weight: 700; color: var(--primary-dark); margin-top: 4px; }

/* ---------- Login card ---------- */
.login-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 40px 34px;
  width: 100%;
  max-width: 380px;
}

.login-card .brand-logo {
  text-align: center;
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 4px;
}

.login-card .brand-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 26px;
}

/* ---------- Forms ---------- */
label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 13px; color: var(--text); }

.form-group { margin-bottom: 16px; }

input[type=text], input[type=password], input[type=email], input[type=number],
input[type=date], input[type=tel], select, textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--white);
  color: var(--text);
  transition: border 0.15s, box-shadow 0.15s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(29,95,214,0.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: 8px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  text-decoration: none;
}

.btn:active { transform: scale(0.98); }
.btn-block { width: 100%; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: var(--white); color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 12px; }

/* ---------- Alerts ---------- */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 14px;
}
.alert-danger { background: #fee2e2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #dcfce7; color: var(--success); border: 1px solid #bbf7d0; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 600px; }

thead th {
  background: var(--primary-light);
  color: var(--primary-dark);
  text-align: left;
  padding: 12px 14px;
  font-weight: 700;
  white-space: nowrap;
}

tbody td { padding: 12px 14px; border-bottom: 1px solid var(--border); }
tbody tr:hover { background: #fafcff; }

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-active { background: #dcfce7; color: var(--success); }
.badge-inactive { background: #fee2e2; color: var(--danger); }
.badge-sales { background: #dbeafe; color: var(--primary-dark); }
.badge-purchase { background: #fef3c7; color: var(--warning); }

/* ---------- Invoice item builder ---------- */
.item-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr auto;
  gap: 10px;
  margin-bottom: 10px;
  align-items: center;
}

.item-row .line-total { font-weight: 600; color: var(--primary-dark); }

.remove-row {
  background: #fee2e2;
  color: var(--danger);
  border: none;
  border-radius: 6px;
  width: 34px;
  height: 34px;
  cursor: pointer;
  font-size: 16px;
}

.totals-box {
  margin-top: 18px;
  max-width: 340px;
  margin-left: auto;
  background: var(--primary-light);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.totals-box .row { display: flex; justify-content: space-between; padding: 6px 0; font-size: 14px; }
.totals-box .row.net { font-size: 18px; font-weight: 800; color: var(--primary-dark); border-top: 1px dashed #b6d0f7; margin-top: 6px; padding-top: 10px; }

/* ---------- Utility ---------- */
.flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .item-row { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .menu-toggle { display: inline-flex; }
  .sidebar-close { display: inline-flex; }
  .sidebar {
    position: fixed;
    z-index: 100;
    top: 0; left: 0; bottom: 0;
    width: min(86vw, 320px);
    transform: translateX(-105%);
    border-right: none;
    border-radius: 0 24px 24px 0;
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.24);
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }

  .sidebar-top {
    position: sticky;
    top: 0;
    background: inherit;
    backdrop-filter: blur(8px);
    z-index: 1;
  }

  .sidebar nav { padding-bottom: 12px; }

  .main-content { padding: 18px 16px 22px; }

  .topbar h1 { font-size: 20px; }
}

@media (max-width: 480px) {
  .login-card { padding: 28px 20px; }
  .item-row { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr; }
  .main-content { padding: 16px 14px 20px; }
  .topbar { margin-bottom: 18px; }
}