:root {
    /* Base Backgrounds */
    --bg-dark: #0a0a12;
    --bg-gradient-inner: #1a1a3a;
    --card-bg: rgba(25, 25, 40, 0.8);
    --input-bg: rgba(0, 0, 0, 0.4);
    
    /* Neon Accents */
    --neon-purple: #bc13fe;
    --neon-purple-dark: #7a10a1;
    --neon-purple-alpha: rgba(188, 19, 254, 0.1);
    --neon-purple-glow: rgba(188, 19, 254, 0.4);
    --neon-purple-glow-strong: rgba(188, 19, 254, 0.6);
    
    --neon-blue: #24d1ff;
    --neon-blue-alpha: rgba(36, 209, 255, 0.1);
    
    /* Status & Feedback */
    --error-red: #ff4b2b;
    --error-red-alpha: rgba(255, 75, 43, 0.2);
    --error-red-glow: rgba(255, 75, 43, 0.4);
    
    /* Text & Borders */
    --text-main: #e0e0ff;
    --text-pure: #ffffff;
    --text-muted: #888;
    --border-glow: rgba(188, 19, 254, 0.3);
    --border-muted: #555;
    
    /* Shadows */
    --shadow-purple: rgba(188, 19, 254, 0.2);
    --shadow-purple-inset: rgba(188, 19, 254, 0.1);
}

body {
    font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 50% 50%, var(--bg-gradient-inner) 0%, var(--bg-dark) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    color: var(--text-main);
    box-sizing: border-box;
}

/* Containers */
container {
    display: block;
    width: 100%;
    max-width: 580px;
    min-height: 460px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--neon-purple);
    border-radius: 12px;
    padding: 25px;
    box-sizing: border-box;
    position: relative;
    box-shadow: 0 0 20px var(--shadow-purple), inset 0 0 10px var(--shadow-purple-inset);
}

header {
    display: block;
    margin-left: 145px;
    margin-bottom: 15px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
}

.label-hand {
    margin-left: 40px;
    margin-right: 65px;
}

main-layout {
    display: flex;
    gap: 25px;
}

player-list {
    display: flex;
    flex-direction: column;
    width: 360px;
    gap: 12px;
}

/* Sidebar & Controls */
side-panel {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

board-group {
    display: block;
    margin-bottom: 45px;
}

board-group label {
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    margin-bottom: 8px;
    margin-left: 40px;
    color: var(--neon-purple);
}

controls {
    display: flex;
    flex-direction: column;
}

/* Inputs & Buttons */
input[type="text"] {
    background: var(--input-bg);
    height: 32px;
    border: 1px solid var(--border-glow);
    border-radius: 4px;
    padding: 0 10px;
    font-family: 'Courier New', monospace;
    color: var(--text-pure);
    box-sizing: border-box;
    transition: all 0.3s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--neon-blue);
    box-shadow: 0 0 8px var(--neon-blue);
}

button {
    height: 32px;
    background: var(--neon-purple-alpha);
    color: var(--text-pure);
    border: 1px solid var(--neon-purple);
    border-radius: 4px;
    cursor: pointer;
    box-sizing: border-box;
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 1px;
    transition: all 0.2s ease;
}

button:hover {
    background: var(--neon-purple);
    box-shadow: 0 0 15px var(--neon-purple);
}

/* Dynamic Elements created via JS */
player {
    display: flex;
    gap: 8px;
    align-items: center;
}

player label { 
    display: inline-block;
    width: 75px; 
    font-size: 15px;
    color: var(--text-main);
}

player button {
    width: 39px;
    font-weight: bold;
}

.hand-input { width: 150px; }
.input-board { width: 135px; }

.output-equity { 
    width: 65px; 
    background: var(--neon-blue-alpha) !important; 
    color: var(--neon-blue) !important;
    border-color: var(--neon-blue) !important;
    text-align: center; 
    font-weight: bold;
}

#btn-evaluate {
    width: 135px;
    height: 70px;
    margin-bottom: 15px;
    font-weight: bold;
    font-size: 14px;
    background: linear-gradient(45deg, var(--neon-purple), var(--neon-purple-dark));
    border: none;
    box-shadow: 0 0 10px var(--neon-purple-glow);
}

#btn-evaluate:hover {
    box-shadow: 0 0 20px var(--neon-purple-glow-strong);
    transform: translateY(-1px);
}

#btn-clear {
    width: 135px;
    background: transparent;
    border-color: var(--border-muted);
    color: var(--text-muted);
}

#btn-clear:hover {
    border-color: var(--error-red);
    color: var(--text-pure);
    background: var(--error-red-alpha);
    box-shadow: 0 0 10px var(--error-red-glow);
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    container {
        padding: 15px;
        height: auto;
    }

    header {
        margin-left: 0;
        display: flex;
        justify-content: space-around;
        text-align: center;
    }

    .label-hand {
        margin-left: 50%;
    }

    .label-equity {
        margin-left: 10%;
    }

    main-layout {
        flex-direction: column;
        gap: 20px;
    }

    player-list {
        width: 100%;
    }

    player {
        justify-content: space-between;
    }

    .hand-input {
        flex-grow: 1;
        width: auto;
        min-width: 80px;
    }

    side-panel {
        border-top: 1px solid var(--border-glow);
        padding-top: 20px;
    }

    board-group {
        margin-bottom: 20px;
        text-align: center;
    }

    board-group label {
        margin-left: 0;
    }

    .input-board, #btn-evaluate, #btn-clear {
        width: 100%;
    }

    #btn-evaluate {
        height: 50px;
    }
}