* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: #2c3e50;
    font-size: 2rem;
    margin-bottom: 10px;
}

header p {
    color: #7f8c8d;
}

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

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #2c3e50;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: border-color 0.3s;
}

.input-group input:focus {
    border-color: #3498db;
    outline: none;
}

.input-group small {
    display: block;
    color: #95a5a6;
    margin-top: 5px;
    font-size: 0.85rem;
}

.time-picker-section {
    margin: 30px 0;
}

.time-picker-section h3 {
    margin-bottom: 5px;
    color: #2c3e50;
}

.time-picker-section p {
    color: #7f8c8d;
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: auto repeat(7, 1fr);
    gap: 2px;
    background-color: #eee;
    padding: 2px;
    border-radius: 8px;
    overflow-x: auto;
}

.grid-header {
    background-color: #f8f9fa;
    padding: 10px 5px;
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
}

.grid-time-label {
    background-color: #f8f9fa;
    padding: 5px 10px;
    text-align: right;
    font-size: 0.8rem;
    color: #7f8c8d;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.grid-cell {
    background-color: #fff;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.grid-cell:hover {
    background-color: #e8f4f8;
}

.grid-cell.selected {
    background-color: #3498db;
}

button {
    width: 100%;
    padding: 15px;
    background-color: #2ecc71;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #27ae60;
}

button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

#statusMessage {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
}

.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Admin Styles */
.admin-table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

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

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #2c3e50;
}

.interest-tag {
    display: inline-block;
    background-color: #e8f4f8;
    color: #2980b9;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    margin: 2px;
}

footer {
    margin-top: 40px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.feedback-link {
    color: #7f8c8d;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s;
}

.feedback-link:hover {
    color: #2ecc71;
}