:root {
    --primary-color: #007bff;
    --background-color: #f4f7f9;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #8a95a5;
    --border-color: #e1e5ea;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 1200px;
}

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

/* Event Selector */
.event-selector {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.event-card {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    width: 280px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.event-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.event-card.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.event-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}
.event-card .details {
    color: var(--text-muted);
    font-size: 0.9em;
}

/* Management Panel */
.management-panel {
    background-color: var(--card-background);
    border-radius: 10px;
    padding: 30px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.management-panel:not(.hidden) {
    opacity: 1;
    transform: translateY(0);
}

.management-panel.hidden {
    display: none;
}

#current-event-title {
    text-align: center;
    margin-top: 0;
    margin-bottom: 30px;
    font-size: 2em;
    font-weight: 600;
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.form-card {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: 8px;
}

input[type="text"] {
    width: calc(100% - 22px);
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: #fff;
    color: var(--text-color);
    border-radius: 4px;
    margin-bottom: 15px;
    transition: border-color 0.2s;
}
input[type="text"]:focus {
    border-color: var(--primary-color);
    outline: none;
}

button {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s;
    color: white;
}
button:active {
    transform: scale(0.98);
}
.buttons { display: flex; gap: 10px; flex-wrap: wrap; }
#register-btn { background-color: var(--success-color); }
#priority-register-btn { background-color: var(--warning-color); color: #333; }
#search-btn { background-color: var(--info-color); }
#remove-btn { background-color: var(--danger-color); } /* Style for new button */
#cancel-btn, #pop-btn { background-color: var(--danger-color); width: 100%; margin-top: 10px; }

/* New divider style */
.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}


/* Lists Display */
.lists-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.list-card {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: 8px;
}
.list-card h3 { margin-top: 0; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
ul { list-style-type: none; padding: 0; min-height: 150px; max-height: 250px; overflow-y: auto; }
li { background-color: #fff; padding: 10px; border-radius: 4px; margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; border: 1px solid var(--border-color); }
li .timestamp { font-size: 0.8em; color: var(--text-muted); }
.empty-placeholder {
    color: var(--text-muted);
    justify-content: center;
    border-style: dashed;
    display: flex;
    background-color: transparent;
}
.hidden { display: none !important; }

/* Notification System */
#notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.notification {
    padding: 15px 20px;
    border-radius: 5px;
    color: white;
    font-weight: 600;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    opacity: 0;
    transform: translateX(100%);
    animation: slideIn 0.5s forwards, fadeOut 0.5s 4s forwards;
}
.notification.success { background-color: var(--success-color); }
.notification.error { background-color: var(--danger-color); }
.notification.info { background-color: var(--info-color); }

@keyframes slideIn {
    to { opacity: 1; transform: translateX(0); }
}
@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; transform: translateX(100%); }
}