/* 🎨 Giao diện chung */
body {
    font-family: system-ui, sans-serif;
    background: #f3f6fa;
    text-align: center;
    margin: 0;
    padding: 0;
}

/* 🧱 Khối bao quanh */
.container {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

/* 🧩 Thẻ card trắng */
.card {
    display: block;
    background: #fff;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 420px;
    margin: 15px auto;
    text-align: center;
    box-sizing: border-box;
}

.card h2 {
    margin-top: 0;
    color: #0a84ff;
}

/* ✏️ Form & input */
input {
    padding: 12px;
    margin: 8px 0;
    width: 100%;
    font-size: 16px;
    border-radius: 8px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

button {
    background: #0a84ff;
    color: white;
    border: none;
    padding: 12px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    transition: background 0.3s;
}

button:hover {
    background: #006be6;
}

/* 💬 Thông báo */
.msg {
    margin-top: 15px;
    text-align: left;
    word-wrap: break-word;
}

.ok {
    background: #e9fbe9;
    color: #065f06;
    padding: 10px;
    border-radius: 8px;
}

.err {
    background: #ffecec;
    color: #a10000;
    padding: 10px;
    border-radius: 8px;
}

/* 📦 Thông tin ví */
#walletInfo {
    font-size: 15px;
    margin-top: 10px;
    word-break: break-word;
}

/* 🌀 Hiệu ứng đang xử lý */
.loading {
    margin-top: 15px;
    color: #006be6;
    font-weight: bold;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #ccc;
    border-top: 3px solid #0a84ff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 🖼️ Header & Footer */
.site-header img,
.site-footer img {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.site-header,
.site-footer {
    display: flex;
    justify-content: center;
}

/* 📱 Responsive */
@media screen and (max-width: 768px) {
    body, .container {
        padding: 0;
        margin: 0;
    }
    .card {
        width: 95%;
    }
}

@media screen and (min-width: 768px) {
    .card {
        max-width: 400px;
    }
}