:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #1f2937;
    --darker-bg: #111827;
    --card-bg: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --border-color: #4b5563;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.header h1 {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Profile Section */
.profile-section {
    margin-bottom: 2rem;
}

.profile-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.profile-card h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.avatar-selection p {
    margin-bottom: 1rem;
    font-weight: 500;
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.avatar-option {
    font-size: 2.5rem;
    padding: 0.75rem;
    background: var(--dark-bg);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    text-align: center;
}

.avatar-option:hover {
    transform: scale(1.1);
    background: var(--darker-bg);
}

.avatar-option.selected {
    border-color: var(--primary-color);
    background: var(--darker-bg);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.name-input {
    margin-bottom: 1.5rem;
}

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

.name-input input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.name-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #7c3aed;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(139, 92, 246, 0.4);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Player Info */
.player-info {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--border-color);
}

.player-avatar {
    font-size: 2rem;
}

.player-name {
    font-size: 1.2rem;
    font-weight: 600;
    flex-grow: 1;
}

/* Game Modes */
.game-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.mode-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.mode-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.mode-card h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.game-selection {
    margin-bottom: 1.5rem;
}

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

.game-select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.game-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.join-section input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.join-section input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.join-options {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.join-options .btn {
    flex: 1;
    min-width: 140px;
}

/* Info Section */
.info-section {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.info-section h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.games-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.game-info-card {
    background: var(--dark-bg);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease;
}

.game-info-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary-color);
}

.game-info-card h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.game-info-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .game-modes {
        grid-template-columns: 1fr;
    }

    .avatar-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .join-options {
        flex-direction: column;
    }

    .join-options .btn {
        width: 100%;
    }
}