/*----------------------------------------------------
  1. Brand Palette & Variables
----------------------------------------------------*/
:root {
  --brand-blue:     #0d6efd;  /* Primary blue */
  --brand-green:    #198754;  /* Accent green */
  --bg-white:       #ffffff;
  --text-default:   #212529;
  --text-muted:     #6c757d;
  --border-light:   #e9ecef;
  --radius:         6px;
  --spacing:        1rem;
  --font-base:      'Roboto', sans-serif;
  --font-heading:   'Open Sans', sans-serif;
}

/*----------------------------------------------------
  2. Global Reset & Base Styles
----------------------------------------------------*/
body {
  margin: 0;
  padding: 0;
  background: var(--bg-white);
  color: var(--text-default);
  font-family: var(--font-base);
  line-height: 1.6;
}

/*----------------------------------------------------
  3. Container
----------------------------------------------------*/
.container {
  width: 90%;
  max-width: 960px;
  margin: 2rem auto;
}

/*----------------------------------------------------
  4. Header & Navigation
----------------------------------------------------*/
.site-header {
  background: var(--brand-blue);
  color: #fff;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing) 0;
}
.site-logo a {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: #fff;
  text-decoration: none;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: #fff;
  cursor: pointer;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1rem;
}
.site-nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
}
.site-nav a:hover {
  color: var(--brand-green);
}

/* Responsive Nav */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; }
  .site-nav.open { display: block; margin-top: var(--spacing); }
  .site-nav ul { flex-direction: column; gap: 0.5rem; }
}

/*----------------------------------------------------
  5. Cards & Content Wrapper
----------------------------------------------------*/
.card {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  margin-bottom: 2rem;
}
.card-body {
  padding: 2rem;
}

/*----------------------------------------------------
  6. Forms & Inputs
----------------------------------------------------*/
.form-group {
  margin-bottom: 1.5rem;
}
label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
input[type="text"],
input[type="password"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  font-family: var(--font-base);
}
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--brand-blue);
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.2);
}
.invalid-feedback {
  color: var(--brand-green);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/*----------------------------------------------------
  7. Buttons
----------------------------------------------------*/
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: filter .2s, transform .1s;
}
.btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--brand-blue);
  border: 1px solid var(--brand-blue);
  color: #fff;
}
.btn-secondary {
  background: var(--brand-green);
  border: 1px solid var(--brand-green);
  color: #fff;
}
.btn-outline-primary {
  background: transparent;
  border: 1px solid var(--brand-blue);
  color: var(--brand-blue);
}
.btn-outline-primary:hover {
  background: var(--brand-blue);
  color: #fff;
}
.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
}

/*----------------------------------------------------
  8. Tables
----------------------------------------------------*/
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}
th, td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}
thead th {
  background: var(--brand-blue);
  color: #fff;
  font-weight: 600;
}
tbody tr:hover {
  background: rgba(25,135,84,0.1); /* light green hover */
}

/*----------------------------------------------------
  9. Alerts & Messages
----------------------------------------------------*/
.messages .alert {
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}
.alert-success { background: var(--brand-green); color: #fff; }
.alert-error   { background: #e83e8c; color: #fff; } /* using Bootstrap danger */
.alert-info    { background: var(--brand-blue); color: #fff; }

/*----------------------------------------------------
 10. Footer
----------------------------------------------------*/
.site-footer {
  text-align: center;
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
}