:root {
    --slate-bg: #fafafa;
    --slate-surface: #ffffff;
    --slate-surface-alt: #f4f4f5;
    --slate-border: #e4e4e7;
    --slate-border-soft: #f0f0f2;
    --slate-text: #09090b;
    --slate-text-soft: #3f3f46;
    --slate-text-muted: #71717a;
    --slate-accent: #18181b;
    --slate-accent-hover: #27272a;
    --slate-radius: 16px;
    --slate-radius-sm: 12px;
    --slate-radius-xs: 8px;
    --slate-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(0, 0, 0, 0.02);
    --slate-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --slate-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
    --slate-wrap: 1180px;
    --slate-content-max: 760px;
    --slate-card-gap: 20px;
    --slate-section-gap: 96px;
}

*, *::before, *::after { box-sizing: border-box; }
html {
    scroll-behavior: smooth;
    overflow-y: scroll;
}

body {
    margin: 0;
    font-family: var(--slate-font);
    font-size: 16px;
    line-height: 1.65;
    color: var(--slate-text);
    background: var(--slate-bg);
    -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: var(--slate-accent); text-decoration: none; }
a:hover { color: var(--slate-accent-hover); }

/* === Skip Link === */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    left: 16px;
    top: 16px;
    width: auto;
    height: auto;
    padding: 10px 16px;
    overflow: visible;
    border-radius: var(--slate-radius-xs);
    background: var(--slate-accent);
    color: #fff;
    z-index: 1000;
}

/* === Layout === */
.wrap {
    width: min(var(--slate-wrap), calc(100% - 48px));
    margin: 0 auto;
}

/* === Header === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(250, 250, 250, 0.88);
    border-bottom: 1px solid var(--slate-border);
}

.header-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 20px;
    min-height: 64px;
}

.logo {
    justify-self: start;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--slate-text);
}

.main-nav {
    display: flex;
    justify-content: center;
    min-width: 0;
}

.main-nav ul {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 14px;
    border-radius: var(--slate-radius-xs);
    color: var(--slate-text-muted);
    font-size: 16px;
    transition: color 0.15s, background-color 0.15s;
}

.main-nav a:hover {
    color: var(--slate-text);
    background: var(--slate-surface-alt);
}

.main-nav a[aria-current="page"] {
    color: var(--slate-text);
    font-weight: 600;
}

.header-phone {
    justify-self: end;
}

.header-phone a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 16px;
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius-xs);
    background: var(--slate-surface);
    color: var(--slate-text);
    font-size: 16px;
    font-weight: 600;
}

.menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius-xs);
    background: var(--slate-surface);
    cursor: pointer;
}

.menu-toggle span {
    width: 16px;
    height: 1.5px;
    border-radius: 999px;
    background: var(--slate-text);
}

/* === Hero === */
.hero-blk {
    padding: var(--slate-section-gap) 0;
}

.hero-shell {
    padding: clamp(40px, 5vw, 72px);
    background: var(--slate-surface);
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius);
    box-shadow: var(--slate-shadow);
}

.hero-wrap {
    display: grid;
    gap: 32px;
}

.hero-text {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 0 12px;
    border-radius: 999px;
    background: var(--slate-surface-alt);
    border: 1px solid var(--slate-border);
    color: var(--slate-text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero-title {
    margin: 0;
    font-size: 56px;
    line-height: 1.04;
    letter-spacing: -0.05em;
    font-weight: 800;
}

.hero-sub {
    max-width: 680px;
    margin: 24px auto 0;
    color: var(--slate-text-soft);
    font-size: 18px;
    line-height: 1.85;
}
.hero-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 20px;
    border-radius: var(--slate-radius-xs);
    border: 1px solid transparent;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.hero-btn {
    background: var(--slate-accent);
    color: #fff;
}

.hero-btn:hover {
    background: var(--slate-accent-hover);
    color: #fff;
}

/* === Section Blocks === */
.blk {
    padding: var(--slate-section-gap) 0;
}

.blk-alt {
    padding: var(--slate-section-gap) 0;
    background: var(--slate-surface-alt);
    border-top: 1px solid var(--slate-border-soft);
    border-bottom: 1px solid var(--slate-border-soft);
}

.blk-title {
    max-width: 14ch;
    margin: 0 auto 20px;
    text-align: center;
    font-size: 32px;
    line-height: 1.1;
    letter-spacing: -0.04em;
    font-weight: 800;
}

.blk-title a {
    color: inherit;
}

.blk-title a:hover {
    color: inherit;
}

.cats-desc,
.page-desc {
    max-width: 680px;
    margin: 0 auto 28px;
    text-align: center;
    color: var(--slate-text-muted);
    font-size: 1.0625rem;
    line-height: 1.8;
}

/* === Cards & Grids === */
.sheet,
.adv-item,
.partner-item,
.rev-item,
.stat-item,
.team-item,
.srv-item,
.post-card,
.contact-card,
.qa-list details {
    background: var(--slate-surface);
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius-sm);
}

.about-content,
.srv-list,
.article-list,
.contact-card-grid {
    display: grid;
    gap: var(--slate-card-gap);
}

.about-content {
    max-width: var(--slate-content-max);
    margin: 0 auto;
}

.about-text,
.article-body {
    color: var(--slate-text-soft);
    font-size: 1.0625rem;
    line-height: 1.85;
}

.article-body p:first-child,
.about-text p:first-child {
    margin-top: 0;
}

.about-more {
    display: flex;
    justify-content: center;
    margin-top: 32px;
}

.adv-grid,
.partner-grid,
.rev-grid,
.stat-grid,
.team-grid,
.post-grid {
    display: grid;
    gap: var(--slate-card-gap);
}

.adv-grid,
.srv-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.adv-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.rev-grid,
.stat-grid,
.team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.adv-item,
.partner-item,
.rev-item,
.stat-item,
.team-item {
    padding: 28px;
    text-align: center;
}

.adv-title,
.team-item h3,
.post-body h3,
.srv-item h2,
.srv-item h3,
.list-body h2,
.related-articles h2 {
    margin: 0;
    color: var(--slate-text);
    font-size: 20px;
    line-height: 1.35;
    letter-spacing: -0.02em;
}

.adv-desc,
.rev-text,
.rev-name,
.stat-label,
.team-item p,
.srv-item p,
.post-body p,
.list-body p,
.footer-about p,
.footer-contact p {
    margin: 12px 0 0;
    color: var(--slate-text-soft);
    font-size: 1rem;
    line-height: 1.75;
}

.partner-item {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    font-size: 1rem;
    font-weight: 600;
}

.stat-num {
    margin: 0;
    color: var(--slate-text);
    font-size: clamp(2.125rem, 3vw, 2.75rem);
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.05em;
}

.stat-label {
    margin-top: 14px;
}

.rev-text {
    font-size: 1rem;
}

.rev-name {
    font-weight: 600;
    color: var(--slate-text);
}

.post-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.post-card,
.list-item {
    overflow: hidden;
}

.post-img,
.list-thumb {
    display: block;
    overflow: hidden;
}

.post-img img,
.list-thumb img {
    width: 100%;
    object-fit: cover;
}

.post-body,
.srv-item,
.sheet {
    padding: 28px;
}

.srv-item {
    text-align: center;
}

.post-body time,
.item-meta,
.article-meta {
    font-size: 0.875rem;
    color: var(--slate-text-muted);
}

.cats-more {
    display: flex;
    justify-content: center;
    margin-top: 32px;
}

.cats-more a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 18px;
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius-xs);
    background: var(--slate-surface);
    color: var(--slate-text);
    font-size: 0.9375rem;
    font-weight: 600;
}

.cats-more a:hover {
    background: var(--slate-surface-alt);
}

/* === Breadcrumb === */
.breadcrumb {
    padding: 20px 0 0;
}

.breadcrumb .wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--slate-text-muted);
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--slate-text-soft);
}

.sep {
    opacity: 0.4;
}

/* === Content Pages === */
.content-wrap,
.list-wrap {
    padding: 28px 0 72px;
}

.page-title {
    max-width: 18ch;
    margin: 0 auto 32px;
    text-align: center;
    font-size: 32px;
    line-height: 1.08;
    letter-spacing: -0.04em;
    font-weight: 800;
}

.article-body {
    max-width: var(--slate-content-max);
    margin: 0 auto;
}

.article-body h2 {
    margin: 36px 0 18px;
    color: var(--slate-text);
    font-size: 22px;
    font-weight: 700;
    line-height: 1.3;
}

.article-body h3 {
    margin: 28px 0 14px;
    color: var(--slate-text);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.35;
}

.article-body h4 {
    margin: 24px 0 12px;
    color: var(--slate-text);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.4;
}

.article-body ul,
.article-body ol {
    padding-left: 1.25rem;
}

.page-closing {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid var(--slate-border-soft);
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    color: var(--slate-text-soft);
    font-size: 0.95rem;
    line-height: 1.85;
}

.page-closing a {
    color: var(--slate-text);
    font-weight: 600;
}

.page-closing a:hover {
    color: var(--slate-accent);
}

.article-list {
    margin-top: 24px;
    grid-template-columns: 1fr;
    gap: 0;
}

.list-item {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: center;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--slate-border);
}

.list-item:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.list-thumb {
    width: 220px;
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius-sm);
}

.list-thumb img {
    width: 220px;
    height: 146px;
    aspect-ratio: 3 / 2;
}

.list-body {
    padding: 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.list-body h2 {
    font-size: 1.25rem;
}

.list-body p {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    overflow: hidden;
}

.item-meta,
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 16px;
}

.article-meta {
    justify-content: center;
    padding-top: 20px;
    border-top: 1px solid var(--slate-border);
}

.source-link {
    margin-top: 32px;
    text-align: center;
    color: var(--slate-text-muted);
}

.prev-next {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.prev-next a,
.prev-next .disabled {
    display: block;
    padding: 20px 24px;
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius-sm);
    background: var(--slate-surface);
    transition: border-color 0.15s;
}

.prev-next a:hover {
    border-color: var(--slate-accent);
}

.prev-next .disabled {
    color: var(--slate-text-muted);
}

.related-articles {
    margin-top: 24px;
}

.related-articles ul,
.footer-nav-grid {
    margin: 0;
    padding: 0;
    list-style: none;
}

.footer-nav-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 16px;
    margin-top: 8px;
}

.related-articles li,
.footer-nav-grid li {
    padding: 10px 0;
    border-bottom: 1px solid var(--slate-border-soft);
}

.related-articles li:last-child {
    border-bottom: 0;
}

.footer-nav-grid li {
    min-width: 0;
    padding: 0;
    border-bottom: 0;
}

.footer-nav a {
    display: block;
    padding: 8px 0;
    color: var(--slate-text-soft);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-nav a:hover {
    color: var(--slate-text);
}

/* === FAQ === */
.qa-list {
    display: grid;
    gap: 16px;
}

.qa-list details {
    padding: 22px 24px;
}

.qa-list summary {
    cursor: pointer;
    font-size: 1.0625rem;
    line-height: 1.55;
    font-weight: 600;
    color: var(--slate-text);
}

.qa-ans {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--slate-border-soft);
    color: var(--slate-text-soft);
}

.qa-ans p {
    margin: 0;
    font-size: 1rem;
    line-height: 1.85;
}

/* === Contact === */
.contact-card-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.contact-card {
    min-width: 0;
    padding: 24px;
}

.contact-card strong {
    display: block;
    color: var(--slate-text);
}

.contact-card a,
.contact-card span {
    display: block;
    margin-top: 10px;
    color: var(--slate-text-soft);
    overflow-wrap: anywhere;
    word-break: break-word;
}

/* === Sitemap === */
.sitemap-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
    border-top: 1px solid var(--slate-border-soft);
}

.sitemap-item {
    min-width: 0;
    border-bottom: 1px solid var(--slate-border-soft);
}

.sitemap-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    color: var(--slate-text-soft);
    font-size: 0.9375rem;
    transition: color 0.15s;
}

.sitemap-link:hover {
    color: var(--slate-accent);
}

.sitemap-link-label {
    min-width: 0;
    flex: 1;
}

.sitemap-link time {
    flex-shrink: 0;
    font-size: 0.8125rem;
    color: var(--slate-text-muted);
}

/* === 404 === */
.not-found-wrap {
    padding: 80px 0;
}

.not-found-card {
    text-align: center;
}

.not-found-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 28px;
}

/* === Footer === */
.site-footer {
    padding: 24px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 24px;
    padding: 32px;
    background: var(--slate-surface);
    border: 1px solid var(--slate-border);
    border-radius: var(--slate-radius);
}

.footer-brand {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--slate-text);
}

.footer-nav strong,
.footer-contact strong {
    display: block;
    margin-bottom: 12px;
    color: var(--slate-text);
}

.footer-bottom {
    padding: 20px 0 32px;
}

.footer-bottom-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
    color: var(--slate-text-muted);
    font-size: 0.875rem;
}

.footer-bottom-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

/* === Responsive === */
@media (max-width: 960px) {
    :root {
        --slate-section-gap: 64px;
    }

    .wrap {
        width: min(100% - 32px, 100%);
    }

    .header-inner {
        display: flex;
        min-height: 56px;
    }

    .menu-toggle {
        display: inline-flex;
        margin-left: auto;
    }

    .header-phone {
        display: none;
    }

    .main-nav {
        position: absolute;
        top: calc(100% + 8px);
        left: 16px;
        right: 16px;
        display: none;
        padding: 12px;
        background: rgba(255, 255, 255, 0.98);
        border: 1px solid var(--slate-border);
        border-radius: var(--slate-radius-sm);
        box-shadow: var(--slate-shadow-md);
    }

    .main-nav.open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        align-items: stretch;
    }

    .main-nav a {
        width: 100%;
        border-radius: var(--slate-radius-xs);
    }

    .adv-grid,
    .srv-list,
    .rev-grid,
    .stat-grid,
    .team-grid,
    .partner-grid,
    .post-grid,
    .contact-card-grid,
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .list-item {
        grid-template-columns: 1fr;
    }

    .list-thumb,
    .list-thumb img {
        width: 100%;
    }

    .list-thumb img {
        height: auto;
    }

    .prev-next {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    :root {
        --slate-section-gap: 48px;
    }

    .wrap {
        width: min(100% - 24px, 100%);
    }

    .hero-shell,
    .sheet,
    .adv-item,
    .partner-item,
    .rev-item,
    .stat-item,
    .team-item,
    .srv-item,
    .post-body,
    .contact-card,
    .footer-grid {
        padding: 20px;
    }

    .not-found-actions {
        flex-direction: column;
    }

    .adv-grid,
    .srv-list,
    .rev-grid,
    .stat-grid,
    .team-grid,
    .partner-grid,
    .post-grid,
    .contact-card-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .sitemap-list {
        grid-template-columns: 1fr;
    }

    .list-item {
        gap: 16px;
        padding: 20px 0;
    }

    .list-thumb,
    .list-thumb img {
        width: 100%;
    }

    .list-thumb img {
        height: auto;
    }

    .footer-bottom-inner {
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms;
        animation-iteration-count: 1;
        transition-duration: 0.01ms;
    }
}