body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    color: #333;
}

/* --- Login Page --- */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-form {
    background: #fff;
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 400px;
    box-sizing: border-box; 
}

.login-form h2 {
    text-align: center;
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box; 
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    background-color: #3498db;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-login:hover {
    background-color: #2980b9;
}

.error-msg {
    color: #e74c3c;
    background: #fbeae5;
    border: 1px solid #e74c3c;
    padding: 0.75rem;
    border-radius: 4px;
    text-align: center;
    margin-bottom: 1rem;
}


/* --- Dashboard Page --- */
.container {
    width: 95%;
    max-width: 1600px;
    margin: 20px auto;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fff;
    padding: 1rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

.header h2 {
    margin: 0;
    color: #2c3e50;
}

.header p {
    margin: 0;
}

.header a {
    color: #e74c3c;
    text-decoration: none;
    font-weight: 500;
}

.table-wrapper {
    overflow-x: auto; 
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
    text-align: left;
    vertical-align: top;
    line-height: 1.4;
}

th {
    background-color: #f9f9f9;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    font-size: 0.85rem;
}

tbody tr:hover {
    background-color: #fafafa;
}

.status-paid {
    color: #2ecc71;
    font-weight: 600;
    background: #eafaf1;
    padding: 3px 8px;
    border-radius: 4px;
}

.status-not-paid {
    color: #e74c3c;
    font-weight: 600;
    background: #fbeae5;
    padding: 3px 8px;
    border-radius: 4px;
}

/* --- Change Status Button --- */
.btn-change-status {
    padding: 6px 10px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid #3498db;
    background-color: #ecf0f1;
    color: #3498db;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-change-status:hover {
    background-color: #3498db;
    color: #fff;
}

/* --- Modal Styles --- */
.modal-overlay {
    position: fixed; 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6); 
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000; 
}

.modal-content {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 450px;
    position: relative; 
    box-sizing: border-box;
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 1.8rem;
    color: #aaa;
    background: none;
    border: none;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: #333;
}

.modal-content h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.modal-content p {
    margin-bottom: 1.5rem;
}

.modal-content .input-group {
    margin-bottom: 1.5rem;
}

.modal-content select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    background-color: #fff; 
}

/* --- Refresh Bar --- */
#refresh-bar {
    display: none; /* Hidden by default */
    background-color: #2ecc71; /* Green */
    color: white;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    margin: 0 auto 20px auto; 
    border-radius: 8px;
    box-sizing: border-box;
}

#refresh-bar a {
    color: white;
    text-decoration: underline;
    font-weight: 700;
    cursor: pointer;
}