* { box-sizing: border-box; }
body {
    font-family: 'Noto Sans Bengali', 'SolaimanLipi', Arial, sans-serif;
    background: #f7f8fa;
    color: #1f2937;
    margin: 0;
    line-height: 1.8;
}
.qbd-header {
    background: #0f766e;
    color: #fff;
    padding: 18px 24px;
}
.qbd-header a.brand {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-size: 22px;
}
.qbd-nav {
    margin-top: 10px;
    font-size: 14px;
}
.qbd-nav a {
    color: #d1fae5;
    margin-right: 14px;
    text-decoration: none;
    font-size: 14px;
}
.qbd-nav a:hover { text-decoration: underline; }
.qbd-container {
    max-width: 820px;
    margin: 30px auto;
    background: #fff;
    padding: 30px 34px;
    border-radius: 10px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.qbd-container h1 {
    color: #0f766e;
    border-bottom: 3px solid #0f766e;
    padding-bottom: 10px;
    font-size: 26px;
}
.qbd-container h2 {
    color: #111827;
    font-size: 19px;
    margin-top: 26px;
}
.qbd-container p, .qbd-container li {
    font-size: 16px;
    color: #374151;
}
.qbd-notice {
    background: #fef3c7;
    border-left: 4px solid #d97706;
    padding: 12px 16px;
    margin: 16px 0;
    font-size: 15px;
}
.qbd-error {
    background: #fee2e2;
    border-left: 4px solid #dc2626;
    color: #991b1b;
    padding: 14px 16px;
    margin: 18px 0;
    font-size: 15px;
    font-weight: bold;
    border-radius: 6px;
    display: none;
}
.qbd-license {
    background: #ecfdf5;
    border-left: 4px solid #0f766e;
    padding: 10px 16px;
    font-weight: bold;
    color: #065f46;
    display: inline-block;
    margin-top: 10px;
}
.qbd-footer {
    background: #111827;
    color: #d1d5db;
    text-align: center;
    padding: 22px;
    margin-top: 40px;
    font-size: 14px;
}
.qbd-footer a {
    color: #6ee7b7;
    text-decoration: none;
    margin: 0 8px;
}

/* Home page action cards */
.qbd-actions {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 24px;
}
.qbd-action-card {
    flex: 1 1 220px;
    background: #f0fdfa;
    border: 2px solid #0f766e;
    border-radius: 12px;
    padding: 28px 20px;
    text-align: center;
    text-decoration: none;
    color: #0f766e;
    font-size: 20px;
    font-weight: bold;
    transition: transform 0.15s ease;
}
.qbd-action-card:hover { transform: translateY(-3px); background: #ccfbf1; }
.qbd-action-card .icon { font-size: 40px; display: block; margin-bottom: 10px; }

/* Recharge form */
.qbd-form label {
    display: block;
    font-weight: bold;
    margin: 16px 0 6px;
    font-size: 15px;
}
.qbd-form input {
    width: 100%;
    padding: 12px 14px;
    font-size: 16px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
}
.qbd-form button {
    margin-top: 22px;
    background: #0f766e;
    color: #fff;
    border: none;
    padding: 13px 30px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
}
.qbd-form button:hover { background: #0d5f58; }

/* Coming soon */
.qbd-coming-soon {
    text-align: center;
    padding: 60px 20px;
}
.qbd-coming-soon .icon { font-size: 60px; }