/* ==========================================================================
   GA SCHOOL ERP - CORE DESIGN SYSTEM & RESPONSIVE ENGINE
   Institution: Bishop Polycarpose Public School, Udane
   Author: GA SOFTWARE (gasoftware.in)
   ========================================================================== */

:root {
  --erp-primary-navy: #0e1e38;
  --erp-deep-sidebar: #081224;
  --erp-accent-blue: #2563eb;
  --erp-accent-hover: #1d4ed8;
  --erp-bg-slate: #f8fafc;
  --erp-surface-white: #ffffff;
  --erp-border-subtle: #e2e8f0;
  --erp-border-focus: #3b82f6;
  --erp-text-dark: #0f172a;
  --erp-text-muted: #64748b;
  --erp-success: #10b981;
  --erp-warning: #f59e0b;
  --erp-danger: #ef4444;
  --erp-radius-lg: 12px;
  --erp-radius-md: 8px;
  --erp-radius-sm: 6px;
  --erp-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --erp-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --erp-shadow-modal: 0 20px 25px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--erp-bg-slate);
  color: var(--erp-text-dark);
  margin: 0;
  padding: 0;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---------------------------------------------------------
   Layout Scaffold
   --------------------------------------------------------- */
.erp-container {
  display: flex;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Sidebar */
.erp-sidebar {
  width: 260px;
  background-color: var(--erp-primary-navy);
  color: #f1f5f9;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1050;
}

.erp-sidebar .brand-box {
  padding: 20px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.erp-sidebar .brand-box h4 {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin: 0;
  color: #ffffff;
}

.erp-sidebar .brand-box small {
  font-size: 11px;
  color: #94a3b8;
  display: block;
  margin-top: 2px;
}

.sidebar-close-btn {
  display: none;
  background: transparent;
  border: 0;
  color: #cbd5e1;
  font-size: 22px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

.erp-nav-menu {
  list-style: none;
  padding: 14px 10px;
  margin: 0;
  flex-grow: 1;
  overflow-y: auto;
}

.erp-nav-item {
  margin-bottom: 4px;
}

.erp-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  color: #94a3b8;
  text-decoration: none;
  border-radius: var(--erp-radius-sm);
  font-size: 13.5px;
  font-weight: 500;
  transition: all 0.18s ease;
  min-height: 42px;
}

.erp-nav-link:hover {
  background-color: rgba(255, 255, 255, 0.06);
  color: #ffffff;
}

.erp-nav-link.active {
  background-color: var(--erp-accent-blue);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.35);
}

/* Mobile Sidebar Backdrop */
.erp-sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(2px);
  z-index: 1040;
}

/* ---------------------------------------------------------
   Main Workspace
   --------------------------------------------------------- */
.erp-main {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-x: hidden;
}

.erp-topbar {
  background-color: var(--erp-surface-white);
  border-bottom: 1px solid var(--erp-border-subtle);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-height: 60px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.topbar-left .institution-tag {
  font-size: 13.5px;
  color: #334155;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hamburger-btn {
  display: none;
  background: #f1f5f9;
  border: 1px solid var(--erp-border-subtle);
  border-radius: var(--erp-radius-sm);
  padding: 8px 12px;
  font-size: 16px;
  color: var(--erp-primary-navy);
  cursor: pointer;
  line-height: 1;
}

.erp-page-content {
  padding: 24px;
  flex-grow: 1;
}

/* ---------------------------------------------------------
   Cards & Data Surfaces
   --------------------------------------------------------- */
.erp-card {
  background: var(--erp-surface-white);
  border: 1px solid var(--erp-border-subtle);
  border-radius: var(--erp-radius-lg);
  box-shadow: var(--erp-shadow-card);
  padding: 20px;
  margin-bottom: 20px;
}

.stat-label {
  font-size: 11.5px;
  color: var(--erp-text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.stat-metric {
  font-size: 26px;
  font-weight: 800;
  color: var(--erp-text-dark);
  margin-top: 6px;
  letter-spacing: -0.5px;
}

/* ---------------------------------------------------------
   Buttons & Form Controls
   --------------------------------------------------------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--erp-accent-blue);
  color: #ffffff !important;
  border: 0;
  padding: 10px 18px;
  border-radius: var(--erp-radius-sm);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.18s ease;
  min-height: 42px;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  color: #475569;
  border: 1px solid var(--erp-border-subtle);
  padding: 10px 18px;
  border-radius: var(--erp-radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  min-height: 42px;
}

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

.erp-form-label {
  font-size: 12.5px;
  font-weight: 600;
  color: #334155;
  margin-bottom: 6px;
  display: block;
}

.erp-form-control {
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--erp-border-subtle);
  border-radius: var(--erp-radius-sm);
  font-size: 14px;
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
  background-color: #ffffff;
  color: var(--erp-text-dark);
  min-height: 42px;
}

.erp-form-control:focus {
  border-color: var(--erp-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

/* ---------------------------------------------------------
   Responsive Tables
   --------------------------------------------------------- */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-responsive table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
}

/* Footer */
.erp-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--erp-border-subtle);
  font-size: 12px;
  color: var(--erp-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--erp-surface-white);
  gap: 12px;
  flex-wrap: wrap;
}

.erp-footer a {
  color: var(--erp-accent-blue);
  text-decoration: none;
  font-weight: 600;
}

/* ---------------------------------------------------------
   Mobile & Tablet Media Queries
   --------------------------------------------------------- */
@media (max-width: 991px) {
  .hamburger-btn {
    display: inline-block;
  }

  .sidebar-close-btn {
    display: inline-block;
  }

  .erp-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.35);
  }

  .erp-sidebar.show {
    transform: translateX(0);
  }

  .erp-sidebar-overlay.show {
    display: block;
  }

  .erp-topbar {
    padding: 10px 16px;
  }

  .erp-page-content {
    padding: 16px;
  }
}

@media (max-width: 640px) {
  .stat-metric {
    font-size: 22px;
  }

  .erp-card {
    padding: 16px;
    border-radius: var(--erp-radius-md);
  }

  .erp-footer {
    flex-direction: column;
    text-align: center;
    gap: 6px;
  }
}