.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(15, 23, 42, 0.16);
    border-radius: 999px;
    background: #ffffff;
    color: #0f172a;
    text-decoration: none;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 600;
}

.tabs {
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 16px;
    background: #ffffff;
    box-shadow: 0 18px 34px rgba(15, 23, 42, 0.08);
    overflow: hidden;
}

.tablist {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px;
    border-bottom: 1px solid rgba(15, 23, 42, 0.1);
    background: #f8fafc;
}

.tab {
    appearance: none;
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 999px;
    background: #ffffff;
    color: #334155;
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    padding: 7px 12px;
    cursor: pointer;
}

.tab.active {
    background: #0f172a;
    color: #ffffff;
    border-color: #0f172a;
}

.panel {
    display: none;
    padding: 22px 20px 26px;
}

.panel.active {
    display: block;
}

.panel h2 {
    margin: 0 0 10px;
    font-size: 24px;
}

.panel h3 {
    margin: 16px 0 8px;
    font-size: 16px;
}

.panel p,
.panel li {
    line-height: 1.6;
    color: #1e293b;
}

.panel ul,
.panel ol {
    margin: 8px 0 0 18px;
    padding: 0;
}

.panel code {
    font-family: ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 12px;
    background: #f1f5f9;
    border-radius: 6px;
    padding: 2px 6px;
}

.panel pre {
    margin: 10px 0;
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 10px;
    background: #f8fafc;
    padding: 10px 12px;
    overflow: auto;
}

.panel pre code {
    background: transparent;
    padding: 0;
}

.hint {
    padding: 10px 12px;
    background: #ecfeff;
    border: 1px solid #a5f3fc;
    border-radius: 10px;
}

@media (max-width: 780px) {
    .panel {
        padding: 18px 14px 22px;
    }
}