.page-faq {
    --faq-rock-dark: #2B3A36;
    --faq-rock-mid: #5F6F6A;
    --faq-rock-deep: #1A2321;
    --faq-cream: #F4EFE6;
    --faq-cream-warm: #EAE2D4;
    --faq-moss-dark: #3E5A2F;
    --faq-moss-light: #7E9E6B;
    --faq-terracotta: #A5572E;
    --faq-terracotta-light: #E4B594;
    --faq-accent-blue: #3B3A5A;
    --faq-font-display: 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
    --faq-font-body: 'Noto Serif SC', 'Source Han Serif SC', serif;
    --faq-font-meta: 'JetBrains Mono', 'Courier New', monospace;

    background-color: var(--faq-cream);
    background-image:
        linear-gradient(to right, rgba(43, 58, 54, 0.06) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(43, 58, 54, 0.06) 1px, transparent 1px);
    background-size: 24px 24px;
    padding-bottom: clamp(48px, 8vw, 96px);
    min-height: 100vh;
}

.page-faq .container {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: clamp(1rem, 4vw, 2.5rem);
    padding-right: clamp(1rem, 4vw, 2.5rem);
}

/* ========= Hero / 顶部标题区 ========= */
.page-faq .faq-hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: calc(var(--header-h, 72px) + 3rem);
    padding-bottom: 2.5rem;
    align-items: center;
}

@media (min-width: 768px) {
    .page-faq .faq-hero {
        grid-template-columns: 1.2fr 0.8fr;
        padding-top: calc(var(--header-h, 72px) + 5rem);
        padding-bottom: 4rem;
    }
}

.page-faq .faq-hero__content h1 {
    font-family: var(--faq-font-display);
    font-weight: 300;
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    line-height: 1.15;
    color: var(--faq-rock-dark);
    margin: 1rem 0 1.25rem;
    letter-spacing: -0.02em;
}

.page-faq .faq-hero__lead {
    font-family: var(--faq-font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--faq-rock-mid);
    max-width: 40rem;
}

.page-faq .faq-hero__meta {
    font-family: var(--faq-font-meta);
    font-size: 0.75rem;
    color: var(--faq-rock-mid);
    border-left: 4px solid var(--faq-terracotta);
    padding-left: 0.75rem;
    margin-top: 2rem;
    line-height: 1.6;
}

.page-faq .breadcrumb {
    font-family: var(--faq-font-meta);
    font-size: 0.75rem;
    color: var(--faq-rock-mid);
}

.page-faq .breadcrumb a {
    color: var(--faq-moss-dark);
    text-decoration: none;
    transition: color 0.2s ease;
}

.page-faq .breadcrumb a:hover {
    color: var(--faq-accent-blue);
}

.page-faq .section-label {
    font-family: var(--faq-font-meta);
    font-size: 0.75rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--faq-accent-blue);
    margin: 0;
}

.page-faq .faq-hero__visual img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--faq-rock-dark);
    background-color: var(--faq-cream-warm);
    display: block;
}

/* ========= 数据速览 ========= */
.page-faq .faq-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--faq-rock-dark);
    background-color: var(--faq-rock-dark);
    color: var(--faq-cream);
    border-radius: 8px;
    margin-bottom: 3rem;
    overflow: hidden;
}

@media (min-width: 768px) {
    .page-faq .faq-metrics {
        grid-template-columns: repeat(4, 1fr);
    }
}

.page-faq .faq-metrics__item {
    padding: 1.25rem 1.5rem;
    border-right: 1px solid rgba(244, 239, 230, 0.2);
    border-bottom: 1px solid rgba(244, 239, 230, 0.2);
}

.page-faq .faq-metrics__item:last-child {
    border-right: none;
}

@media (min-width: 768px) {
    .page-faq .faq-metrics__item {
        border-bottom: none;
    }
}

.page-faq .faq-metrics__item strong {
    font-family: var(--faq-font-display);
    font-weight: 300;
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    display: block;
    line-height: 1.2;
}

.page-faq .faq-metrics__item strong em {
    font-style: normal;
    font-size: 0.6em;
    margin-left: 2px;
    color: var(--faq-terracotta-light);
}

.page-faq .faq-metrics__item span {
    font-family: var(--faq-font-meta);
    font-size: 0.7rem;
    color: rgba(244, 239, 230, 0.8);
}

/* ========= 筛选与问答列表 ========= */
.page-faq .faq-filter-wrap {
    margin-bottom: 3rem;
}

.page-faq .faq-filter-wrap input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.page-faq .faq-filter-wrap input[type="radio"]:focus-visible + label {
    outline: 2px solid var(--faq-accent-blue);
    outline-offset: 2px;
}

.page-faq .faq-filter-wrap .faq-filter__labels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.page-faq .faq-filter-wrap label {
    font-family: var(--faq-font-meta);
    font-size: 0.8rem;
    padding: 0.5rem 1.25rem;
    border: 1px solid var(--faq-rock-dark);
    border-radius: 999px;
    color: var(--faq-rock-dark);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    background-color: transparent;
}

.page-faq .faq-filter-wrap input[type="radio"]:checked + label {
    background-color: var(--faq-rock-dark);
    color: var(--faq-cream);
    border-color: var(--faq-rock-dark);
}

.page-faq .faq-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 900px) {
    .page-faq .faq-list {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
}

/* 筛选逻辑：默认隐藏所有，选择特定分类时显示对应项目 */
.page-faq .faq-filter-wrap input:checked ~ .faq-list .faq-item {
    display: none;
}

.page-faq .faq-filter-wrap input#filter-all:checked ~ .faq-list .faq-item {
    display: block;
}

.page-faq .faq-filter-wrap input#filter-account:checked ~ .faq-list .faq-item[data-category="account"],
.page-faq .faq-filter-wrap input#filter-settings:checked ~ .faq-list .faq-item[data-category="settings"],
.page-faq .faq-filter-wrap input#filter-event:checked ~ .faq-list .faq-item[data-category="event"],
.page-faq .faq-filter-wrap input#filter-security:checked ~ .faq-list .faq-item[data-category="security"],
.page-faq .faq-filter-wrap input#filter-help:checked ~ .faq-list .faq-item[data-category="help"] {
    display: block;
}

/* 单个问答卡片 */
.page-faq .faq-item {
    display: block;
    border: 1px solid var(--faq-rock-dark);
    background-color: var(--faq-cream-warm);
    border-radius: 8px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
}

.page-faq .faq-item[open] {
    box-shadow: 4px 4px 0px 0px var(--faq-rock-dark);
    border-color: var(--faq-rock-dark);
}

.page-faq .faq-item summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 1.25rem 1.25rem;
    font-family: var(--faq-font-body);
    font-weight: 600;
    color: var(--faq-rock-dark);
    transition: background-color 0.2s ease;
}

.page-faq .faq-item summary::-webkit-details-marker {
    display: none;
}

.page-faq .faq-item summary:hover {
    background-color: rgba(164, 87, 46, 0.08);
}

.page-faq .faq-item summary::after {
    content: "+";
    font-family: var(--faq-font-meta);
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--faq-terracotta);
    margin-left: auto;
    line-height: 1;
    flex-shrink: 0;
}

.page-faq .faq-item[open] summary::after {
    content: "–";
}

.page-faq .faq-item__index {
    font-family: var(--faq-font-meta);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--faq-accent-blue);
    flex-shrink: 0;
    min-width: 1.8em;
}

.page-faq .faq-item__cat {
    font-family: var(--faq-font-meta);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.1rem 0.5rem;
    border-radius: 4px;
    flex-shrink: 0;
    background-color: var(--faq-moss-light);
    color: var(--faq-rock-deep);
}

.page-faq .faq-item__question {
    flex: 1;
    line-height: 1.4;
}

.page-faq .faq-item__answer {
    padding: 0 1.25rem 1.25rem 3.5rem;
    color: var(--faq-rock-mid);
    font-family: var(--faq-font-body);
    font-size: 0.95rem;
    line-height: 1.7;
    border-top: 1px solid rgba(43, 58, 54, 0.15);
}

.page-faq .faq-item__answer p {
    margin: 0.75rem 0 0;
}

.page-faq .faq-item__answer ul {
    margin: 0.5rem 0;
    padding-left: 1.25rem;
}

.page-faq .faq-item__answer li {
    margin-bottom: 0.25rem;
}

.page-faq .faq-item__answer a {
    color: var(--faq-moss-dark);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color 0.2s ease;
}

.page-faq .faq-item__answer a:hover {
    color: var(--faq-accent-blue);
}

/* ========= 底部设置指引配图区域 ========= */
.page-faq .faq-guide {
    margin-top: 4rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    border: 1px solid var(--faq-rock-dark);
    background-color: var(--faq-terracotta-light);
    border-radius: 8px;
    padding: 1.5rem;
    position: relative;
}

@media (min-width: 768px) {
    .page-faq .faq-guide {
        grid-template-columns: 0.8fr 1.2fr;
        align-items: center;
        padding: 2rem;
    }
}

.page-faq .faq-guide__visual img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--faq-rock-dark);
    background-color: var(--faq-cream);
    display: block;
}

.page-faq .faq-guide__content h2 {
    font-family: var(--faq-font-display);
    font-weight: 300;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--faq-rock-dark);
    margin: 0.5rem 0 1rem;
    line-height: 1.2;
}

.page-faq .faq-guide__content p {
    color: var(--faq-rock-mid);
    font-family: var(--faq-font-body);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.page-faq .faq-guide__content .btn {
    display: inline-block;
    margin-top: 0.75rem;
    font-family: var(--faq-font-meta);
    font-size: 0.8rem;
    padding: 0.6rem 1.5rem;
    border-radius: 999px;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-guide__content .btn + .btn {
    margin-left: 0.75rem;
}

.page-faq .faq-guide__content .btn--primary {
    background-color: var(--faq-moss-dark);
    color: var(--faq-cream);
    border: 1px solid var(--faq-moss-dark);
}

.page-faq .faq-guide__content .btn--primary:hover {
    background-color: var(--faq-rock-dark);
    border-color: var(--faq-rock-dark);
}

.page-faq .faq-guide__content .btn--secondary {
    background-color: transparent;
    color: var(--faq-rock-dark);
    border: 1px solid var(--faq-rock-dark);
}

.page-faq .faq-guide__content .btn--secondary:hover {
    background-color: var(--faq-rock-dark);
    color: var(--faq-cream);
}

/* ========= 响应式微调 ========= */
@media (max-width: 480px) {
    .page-faq .faq-metrics {
        grid-template-columns: 1fr 1fr;
    }

    .page-faq .faq-metrics__item {
        border-bottom: 1px solid rgba(244, 239, 230, 0.2);
    }

    .page-faq .faq-item__answer {
        padding-left: 1.25rem;
    }

    .page-faq .faq-guide__content .btn + .btn {
        margin-left: 0;
        margin-top: 0.5rem;
    }
}