/* Core Design System */
:root {
    --bg-color: #0f172a; /* Midnight Blue */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8; /* Sky Blue Neon */
    --accent-hover: #0ea5e9;
    --danger-color: #ef4444;
    --success-color: #22c55e;
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%), 
        radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
}

/* Glassmorphism Card */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    padding: 2rem;
    margin: 1rem auto;
    max-width: 500px; /* Default for login/setup */
    animation: fadeIn 0.5s ease-out;
}

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input, select, button {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
}

input:focus, select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

button {
    background: var(--accent-color);
    color: #000;
    font-weight: 600;
    border: none;
    cursor: pointer;
    margin-top: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

button:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.text-danger { color: var(--danger-color); font-size: 0.85rem; margin-top: 0.5rem; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Game Specific Styles (Placeholder for Phase 3) */
.game-container {
    max-width: 100%;
    display: grid;
    gap: 1rem;
}