* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: #111827;
    background: #ffffff;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC",
    "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.article {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
    padding: 22px 18px 30px;
}

h1 {
    margin: 0 0 10px;
    font-size: 24px;
    line-height: 1.28;
    font-weight: 700;
}

h2 {
    margin: 26px 0 10px;
    font-size: 20px;
    line-height: 1.35;
    font-weight: 700;
}

p,
li {
    color: #374151;
    font-size: 15px;
    line-height: 1.65;
}

.lead {
    margin: 0 0 14px;
    color: #4b5563;
}

.brand-tabs {
    display: flex;
    gap: 14px;
    margin: 0 0 22px;
    padding: 10px 0 12px;
    border-top: 1px solid #eeeeee;
    border-bottom: 1px solid #eeeeee;
}

.brand-tab {
    padding: 0;
    border: 0;
    background: transparent;
    color: #8a94a6;
    font: inherit;
    font-size: 15px;
    cursor: pointer;
}

.brand-tab.is-active {
    color: #1a73e8;
}

[hidden] {
    display: none !important;
}

.path {
    margin: 0 0 12px;
    padding: 9px 10px;
    border-left: 3px solid #1a73e8;
    background: #f7f9fc;
    color: #1f2937;
    font-size: 14px;
}

.note {
    margin: 0 0 14px;
    padding: 8px 10px;
    border-left: 3px solid #f59e0b;
    background: #fffbeb;
    color: #4b5563;
    font-size: 14px;
}

.guide-step {
    margin: 0 0 16px;
}

.guide-step p {
    margin: 0 0 8px;
}

.screen-thumb {
    display: grid;
    gap: 8px;
    padding: 0;
    border: 0;
    background: transparent;
    color: #111827;
    text-align: left;
    cursor: pointer;
    width: min(62vw, 260px);
    margin: 0 auto;
}

.screen-thumb img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid #eeeeee;
    background: #f8f8f8;
}

.is-lightbox-open {
    overflow: hidden;
}

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: grid;
    grid-template-rows: 1fr auto;
    align-items: center;
    justify-items: center;
    padding: calc(18px + env(safe-area-inset-top)) 14px calc(18px + env(safe-area-inset-bottom));
    background: rgba(0, 0, 0, 0.86);
}

.lightbox[hidden] {
    display: none;
}

.lightbox img {
    max-width: min(100%, 520px);
    max-height: 86vh;
    object-fit: contain;
    background: #ffffff;
}

.lightbox p {
    margin: 10px 40px 0;
    color: rgba(255, 255, 255, 0.86);
    font-size: 14px;
    text-align: center;
}

.lightbox-close {
    position: fixed;
    top: calc(12px + env(safe-area-inset-top));
    right: 12px;
    width: 38px;
    height: 38px;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
    font-size: 28px;
    line-height: 1;
}

@media (min-width: 760px) {
    body {
        background: #fafafa;
    }

    .article {
        background: #ffffff;
    }
}