* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #0f172a;
    color: #f8fafc;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 15px;
}

.container {
    width: 100%;
    max-width: 420px;
    background: #1e293b;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.header {
    text-align: center;
    margin-bottom: 20px;
}

.header h1 {
    font-size: 22px;
    color: #38bdf8;
    margin-bottom: 6px;
}

.header p {
    font-size: 13px;
    color: #94a3b8;
}

.wallet-card {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.wallet-balance {
    font-size: 24px;
    font-weight: bold;
}

.btn {
    display: block;
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background-color: #38bdf8;
    color: #0f172a;
    font-weight: bold;
    font-size: 15px;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: 0.2s ease;
    margin-top: 10px;
}

.btn:hover {
    background-color: #0284c7;
    color: #ffffff;
}

.btn-secondary {
    background-color: #334155;
    color: #f8fafc;
}

.btn-secondary:hover {
    background-color: #475569;
}

.input-group {
    margin-bottom: 14px;
    text-align: left;
}

.input-group label {
    display: block;
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 6px;
}

.input-group input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid #334155;
    background-color: #0f172a;
    color: #fff;
    font-size: 14px;
}

.input-group input:focus {
    outline: none;
    border-color: #38bdf8;
}

.game-card {
    background: #334155;
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 15px;
}

.timer {
    font-size: 32px;
    font-weight: bold;
    color: #f59e0b;
    margin: 15px 0;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 15px;
}

.option-btn {
    padding: 14px;
    background: #1e293b;
    border: 1px solid #475569;
    color: #fff;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
}

.option-btn:hover {
    border-color: #38bdf8;
    background: #0f172a;
}