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

body {
    background: #0a0a0a;
    color: #f5f5f5;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    text-align: center;
    max-width: 600px;
    width: 100%;
}

.logo {
    width: 200px;
    height: 200px;
    margin-bottom: 50px;
    filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.1));
}

.selector {
    margin-bottom: 40px;
}

.selector select {
    background: #1a1a1a;
    color: #f5f5f5;
    border: 1px solid #2a2a2a;
    padding: 15px 25px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    outline: none;
    min-width: 300px;
    transition: all 0.3s ease;
}

.selector select:hover {
    border-color: #00ff88;
}

.selector select:focus {
    border-color: #00ff88;
}

.buttons {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.pay-btn {
    background: #00ff88;
    color: #0a0a0a;
    border: none;
    padding: 18px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    min-width: 350px;
    transition: all 0.2s ease;
}

.pay-btn:hover {
    background: #00dd77;
    transform: translateY(-2px);
}

.pay-btn:active {
    transform: translateY(0);
}

.loading {
    display: none;
    margin-top: 40px;
}

.spinner {
    border: 4px solid #1a1a1a;
    border-top: 4px solid #00ff88;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading p {
    color: #888;
    font-size: 1rem;
}

@media (max-width: 600px) {
    .logo {
        width: 150px;
        height: 150px;
        margin-bottom: 30px;
    }

    .selector select {
        min-width: 100%;
        font-size: 1rem;
    }

    .pay-btn {
        min-width: 100%;
        font-size: 1rem;
        padding: 16px 30px;
    }
}