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

body {
    font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    font-size: 14px;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.lang-tabs {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    background: #fff;
    border-bottom: 1px solid #e8e8e8;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.lang-tab {
    flex: 1;
    padding: 14px 8px;
    border: none;
    background: transparent;
    font-size: 14px;
    color: #666;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.lang-tab.active {
    color: #007aff;
    font-weight: 600;
    background: rgba(0, 122, 255, 0.06);
    box-shadow: inset 0 -2px 0 #007aff;
}

.lang-tab:disabled {
    opacity: 0.5;
    cursor: wait;
}

.page {
    max-width: 750px;
    margin: 0 auto;
    padding: 15px;
}

.container {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    min-height: 200px;
}

.container h1 {
    font-size: 18px;
    color: #222;
    text-align: center;
    margin-bottom: 25px;
    font-weight: 600;
    line-height: 1.4;
}

.container h2 {
    font-size: 16px;
    color: #222;
    margin: 20px 0 10px;
    font-weight: 600;
    padding-left: 8px;
    border-left: 3px solid #007aff;
    line-height: 1.4;
}

.container h3 {
    font-size: 15px;
    color: #333;
    margin: 15px 0 8px;
    font-weight: 600;
    line-height: 1.4;
}

.container p {
    margin: 8px 0;
    text-indent: 2em;
    word-break: break-word;
}

.status {
    text-align: center;
    padding: 48px 16px;
    color: #999;
}

.status.error {
    color: #e53935;
}

.spinner {
    width: 28px;
    height: 28px;
    margin: 0 auto 12px;
    border: 3px solid #e8e8e8;
    border-top-color: #007aff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 375px) {
    body {
        font-size: 13px;
    }

    .page {
        padding: 10px;
    }

    .container {
        padding: 15px;
    }

    .container h1 {
        font-size: 17px;
        margin-bottom: 20px;
    }

    .container h2 {
        font-size: 15px;
    }

    .container h3 {
        font-size: 14px;
    }

    .lang-tab {
        font-size: 13px;
        padding: 12px 4px;
    }
}