:root {
    --primary-color: #2c3e50; /* Dark Blue */
    --secondary-color: #3498db; /* Bright Blue */
    --background-color: #ecf0f1; /* Light Gray */
    --card-bg-color: #ffffff;
    --text-color: #34495e; /* Dark Gray */
    --success-color: #27ae60;
    --danger-color: #e74c3c;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Main Container kwa ajili ya side-menu na content */
.dashboard-layout {
    display: flex;
    flex-grow: 1;
}

/* Styling kwa ajili ya Side-Menu */
.sidebar {
    width: 250px;
    background-color: var(--primary-color);
    color: white;
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
}

.sidebar .logo {
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
}

.sidebar .logo a {
    color: white;
    text-decoration: none;
    font-size: 24px;
    font-weight: bold;
}

.sidebar-menu {
    width: 100%;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    margin-bottom: 5px;
    transition: background-color 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.sidebar-menu a:hover {
    background-color: #34495e;
}

.sidebar-menu a.active {
    background-color: var(--secondary-color);
    font-weight: bold;
}

/* CSS kwa ajili ya Logout button kwenye sidebar */
.sidebar-menu a.logout {
    background-color: var(--danger-color);
    margin-top: auto;
    justify-content: center;
}

.sidebar-menu a.logout:hover {
    background-color: #c0392b;
}

.sidebar-menu a i {
    margin-right: 15px;
    width: 20px;
    text-align: center;
}

/* ------------------------------------------- */
/* --- SEHEMU YA MAREKEBISHO YA MUHIMU --- */
/* ------------------------------------------- */

/* Staili ya Kitufe cha Dropdown */
.sidebar-dropdown-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    color: white; /* Hakikisha ina rangi sawa na menyu nyingine */
    text-decoration: none;
    padding: 15px 20px; /* Hakikisha padding inafanana na viungo vingine */
    border-radius: 5px; /* Hakikisha border-radius inafanana */
    margin-bottom: 5px;
    transition: background-color 0.3s ease;
}

.sidebar-dropdown-toggle:hover {
    background-color: #34495e;
}

.sidebar-dropdown-toggle i {
    /* Hii inahakikisha icon ya mkopo inalingana na icon nyingine */
    margin-right: 15px;
    width: 20px;
    text-align: center;
}

/* Staili ya Mshale (Arrow) */
.dropdown-arrow {
    transition: transform 0.3s ease;
    margin-right: 0; /* Ondoa margin-right ili isisukume kulia zaidi */
}

.dropdown-arrow.rotated {
    transform: rotate(180deg);
}

/* Kuficha na Kuonyesha Menyu Ndogo */
.dropdown-content {
    display: none;
    flex-direction: column;
    width: 100%;
}

/* Staili kwa Viungo vilivyo Ndani ya Menyu */
.dropdown-content a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 10px 20px 10px 55px; /* Ongeza padding-left zaidi ili kuonyesha indent */
    transition: background-color 0.3s;
    border-radius: 5px;
}

.dropdown-content a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ------------------------------------------- */
/* --- MWISHO WA MAREKEBISHO YA MUHIMU --- */
/* ------------------------------------------- */

.sidebar .user-info {
    margin-top: 20px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar .user-info p {
    margin: 5px 0;
    font-size: 14px;
}

/* Content ya kulia */
.main-content {
    flex-grow: 1;
    padding: 20px;
}

.header {
    background-color: var(--card-bg-color);
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

/* Hii CSS inahakikisha jina linakaa katikati ya header */
.header h1 {
    margin: 0 auto;
    font-size: 24px;
    color: var(--primary-color);
    text-align: center;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background-color: var(--card-bg-color);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.card .icon {
    font-size: 40px;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.card h3 {
    margin: 0;
    font-size: 16px;
    color: #7f8c8d;
}

.card strong {
    display: block;
    margin-top: 5px;
    font-size: 28px;
    color: var(--primary-color);
    font-weight: 600;
}

.summary-card {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding: 30px;
    background-color: #dbe4ee;
}

@media (max-width: 768px) {
    .summary-card {
        grid-template-columns: 1fr;
    }
}

.chart-container {
    background-color: var(--card-bg-color);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
}

.chart-container h3 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 20px;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #7f8c8d;
    background-color: #ffffff;
    border-top: 1px solid #d1d5d8;
    margin-top: 20px;
}

@media (max-width: 768px) {
    .dashboard-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        flex-direction: row;
        justify-content: space-around;
        padding: 10px 0;
    }
    .sidebar .logo, .sidebar .user-info {
        display: none;
    }
    .sidebar-menu {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
}

/* --- Styles za Fomu --- */

.form-container {
    background-color: var(--card-bg-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    max-width: 600px;
    margin: 20px auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--secondary-color);
    outline: none;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    background-color: var(--success-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-weight: bold;
}

.btn:hover {
    background-color: #218838;
}

.centered-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.centered-container .table-responsive {
    width: 100%;
}

.btn-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.message {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 5px;
    font-weight: bold;
    text-align: center;
    border: 1px solid transparent;
}

.success-message {
    background-color: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

/* Ongeza kanuni za jedwali hapa */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card-bg-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

.data-table th, .data-table td {
    padding: 15px 20px; /* Hii ndio sehemu iliyorekebishwa kwa ajili ya nafasi! */
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.data-table thead th {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}

.data-table tbody tr:hover {
    background-color: #f1f1f1;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Styles kwa ajili ya dropdown ya kubadilisha jukumu */
.data-table select {
    padding: 5px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

/* Styles kwa link za ndani ya jedwali */
.data-table td a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
}

.data-table td a:hover {
    text-decoration: underline;
}