/* General layout */
body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    color: #f9fafb; /* slate-50 */
}

/* Queue container */
.queue-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.25rem;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 1rem;
    box-sizing: border-box;
}

/* Each column */
.column {
    flex: 1 1 300px;
    max-width: 350px;
    background-color: #1f2937; /* slate-800 */
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: inset 4px 4px 12px #111827, inset -4px -4px 12px #374151;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Column headers */
.column h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

/* Cards for names */
.card {
    width: 150px;
    margin: 0.5rem 0;
    padding: 0.75rem;
    background-color: #374151; /* slate-700 */
    border-radius: 0.75rem;
    box-shadow: 2px 2px 5px #111827, -2px -2px 5px #4b5563;
    text-align: center;
    font-size: 0.95rem;
}

/* Button styling */
.button {
    background-color: #2563eb; /* blue-600 */
    color: #ffffff;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.button:hover {
    background-color: #1d4ed8; /* blue-700 */
    transform: translateY(-1px);
}

.button:active {
    transform: translateY(1px);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

/* Control button row */
.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin: 2rem auto 0;
    width: fit-content;
}

/* Timer display */
.timer {
    margin-top: 1.25rem;
    text-align: center;
    font-size: 1.5rem;
    color: #bbf7d0; /* emerald-200 */
}

/* Dropdown select */
select {
    background-color: #374151;
    color: #f9fafb;
    padding: 0.5rem 0.75rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 1rem;
}

/* Modal background */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(15, 23, 42, 0.5); /* slate-900 w/ opacity */
}

/* Modal content box */
.modal-content {
    background-color: #111827;
    color: #f9fafb;
    margin: 15% auto;
    padding: 1.25rem;
    border: 1px solid #6b7280;
    width: 30%;
    border-radius: 0.75rem;
    text-align: center;
}

/* Disabled hover */
.disabled-hover:hover {
    background-color: #1f2937 !important;
    transform: none !important;
    box-shadow: 2px 2px 8px #111827, -2px -2px 8px #4b5563 !important;
}