@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

:root {
    --bg-color: #0f1419;
    --card-bg: #1a1f2e;
    --surface-bg: #252b3d;
    --primary-color: #6366f1;
    --primary-hover: #7c3aed;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --light-shadow: rgba(255, 255, 255, 0.05);
    --dark-shadow: rgba(0, 0, 0, 0.3);
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --border-color: #334155;
    --input-bg: #1e293b;
    --glow: rgba(99, 102, 241, 0.15);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, #1a1f2e 100%);
    color: var(--text-color);
    font-smoothing: antialiased;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
    min-height: 100vh;
    padding: 2rem 1rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--card-bg);
    border-radius: 20px;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-color) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.25rem;
    font-weight: 500;
    margin: 2rem 0 1rem 0;
    color: var(--text-color);
    opacity: 0.9;
}

.add-participant-section {
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

#participant-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.2s ease;
}

#participant-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--glow);
}

#participant-input::placeholder {
    color: var(--text-muted);
}

.json-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
}

button {
    border: none;
    border-radius: 12px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

#add-btn {
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--surface-bg) 0%, var(--card-bg) 100%);
    color: var(--primary-color);
    font-size: 1rem;
    min-width: 100px;
    border: 1px solid var(--border-color);
}

#add-btn:hover {
    color: var(--text-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--glow);
}

#export-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    font-size: 0.9rem;
    border: 1px solid var(--success-color);
}

#export-btn:hover {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
    transform: translateY(-1px);
}

#import-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--surface-bg) 0%, var(--card-bg) 100%);
    color: var(--text-color);
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

#import-btn:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--glow);
}

#generate-btn {
    width: 100%;
    padding: 1.25rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(99, 102, 241, 0.4);
}

#generate-btn:active {
    transform: translateY(0);
}

/* Two-column layout */
.columns-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.participants-section,
.queue-section {
    background: linear-gradient(135deg, var(--surface-bg) 0%, var(--card-bg) 100%);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

#participants-list,
#queue-result {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

#participants-list li,
#queue-result li {
    padding: 1rem 1.5rem;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--surface-bg) 100%);
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

#participants-list li::before,
#queue-result li::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0;
    transition: opacity 0.2s ease;
}

#participants-list li:hover,
#queue-result li:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

#participants-list li:hover::before,
#queue-result li:hover::before {
    opacity: 1;
}

.remove-btn {
    background: transparent;
    border: none;
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.remove-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: var(--danger-color);
    transform: scale(1.1);
}

.remove-btn svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-secondary);
    transition: stroke 0.2s ease;
}

.remove-btn:hover svg {
    stroke: var(--danger-color);
}

#queue-result {
    counter-reset: item;
}

#queue-result li {
    position: relative;
    padding-left: 3.5rem;
}

#queue-result li::after {
    content: counter(item);
    counter-increment: item;
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }
    
    .container {
        padding: 1.5rem;
        border-radius: 16px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    #add-btn {
        min-width: auto;
    }
    
    .json-controls {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .columns-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .participants-section,
    .queue-section {
        padding: 1rem;
    }
}