:root {
    --us-bg: #f4f6f8;
    --us-surface: #ffffff;
    --us-surface-soft: #fbfcfd;
    --us-hero-bg: linear-gradient(180deg, #eef3f8 0%, #e7edf4 100%);
    --us-hero-panel: linear-gradient(180deg, rgba(255,255,255,0.82) 0%, rgba(255,255,255,0.64) 100%);
    --us-text: #243243;
    --us-muted: #5f7081;
    --us-line: #d9e2ea;
    --us-line-strong: #c8d2dc;
    --us-accent: #5e768d;
    --us-accent-dark: #445a70;
    --us-accent-soft: #edf3f7;
    --us-warm: #f6f2ea;
    --us-warm-line: #d8c7a8;
    --us-shadow: 0 12px 34px rgba(36, 50, 67, 0.06);
    --us-shadow-soft: 0 8px 22px rgba(36, 50, 67, 0.04);
    --us-radius-xl: 28px;
    --us-radius-lg: 22px;
    --us-radius-md: 16px;
    --us-wrap: min(1180px, calc(100% - 32px));
}

.us-page {
    background: linear-gradient(180deg, #f7f9fb 0%, var(--us-bg) 100%);
    color: var(--us-text);
}

.us-wrap {
    width: var(--us-wrap);
    margin: 0 auto;
}

.us-hero,
.us-article-hero {
    position: relative;
    margin: 0 0 28px;
    padding: 38px 0 34px;
    background: var(--us-hero-bg);
    border-bottom: 1px solid rgba(94, 118, 141, 0.08);
}

.us-hero::before,
.us-article-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 12% 20%, rgba(94, 118, 141, 0.08), transparent 26%),
        radial-gradient(circle at 88% 14%, rgba(94, 118, 141, 0.07), transparent 22%),
        linear-gradient(180deg, rgba(255,255,255,0.10) 0%, rgba(255,255,255,0) 100%);
    pointer-events: none;
}

.us-hero-card,
.us-article-card {
    position: relative;
    z-index: 1;
    padding: 34px 36px;
    border-radius: var(--us-radius-xl);
    background: var(--us-hero-panel);
    border: 1px solid rgba(200, 210, 220, 0.82);
    box-shadow: 0 18px 44px rgba(36, 50, 67, 0.06);
    backdrop-filter: blur(8px);
}

.us-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: 999px;
    margin-bottom: 16px;
    background: rgba(94, 118, 141, 0.10);
    border: 1px solid rgba(94, 118, 141, 0.14);
    color: var(--us-accent-dark);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.us-breadcrumbs {
    margin: 0 0 14px;
    font-size: 14px;
    color: var(--us-muted);
}

.us-breadcrumbs a,
.us-back-link,
.us-nav-card a,
.us-side-card a,
.us-content a,
.us-section-card a,
.us-list-card a,
.us-note a,
.us-cta-card a,
.us-topic-card {
    color: var(--us-accent-dark);
}

.us-breadcrumbs a,
.us-back-link,
.us-nav-card a,
.us-side-card a,
.us-content a,
.us-section-card a,
.us-list-card a,
.us-note a,
.us-cta-card a {
    text-decoration: none;
    background-image: linear-gradient(currentColor, currentColor);
    background-position: 0 100%;
    background-repeat: no-repeat;
    background-size: 0% 1px;
    transition: color .18s ease, background-size .18s ease;
}

.us-breadcrumbs a:hover,
.us-back-link:hover,
.us-nav-card a:hover,
.us-side-card a:hover,
.us-content a:hover,
.us-section-card a:hover,
.us-list-card a:hover,
.us-note a:hover,
.us-cta-card a:hover {
    color: var(--us-accent);
    background-size: 100% 1px;
}

.us-hero h1,
.us-article-hero h1 {
    margin: 0;
    color: var(--us-text);
    font-size: clamp(34px, 5vw, 52px);
    line-height: 1.07;
    letter-spacing: -0.03em;
}

.us-lead,
.us-article-lead {
    max-width: 860px;
    margin: 18px 0 0;
    color: #425568;
    font-size: clamp(18px, 2vw, 21px);
    line-height: 1.78;
}

.us-main {
    padding: 8px 0 76px;
}

.us-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.28fr) minmax(290px, .72fr);
    gap: 34px;
    align-items: start;
}

.us-content,
.us-side-card,
.us-section-card,
.us-list-card,
.us-note,
.us-nav-card,
.us-cta-card {
    background: var(--us-surface);
    border: 1px solid rgba(201, 211, 220, 0.85);
    border-radius: var(--us-radius-lg);
    box-shadow: var(--us-shadow-soft);
}

.us-content,
.us-section-card,
.us-list-card,
.us-note,
.us-nav-card,
.us-cta-card {
    padding: 30px 30px;
}

.us-side {
    display: grid;
    gap: 26px;
}

.us-side-card {
    padding: 26px;
}

.us-content p,
.us-section-card p,
.us-note p,
.us-list-card li,
.us-side-card li,
.us-cta-card p {
    margin: 0;
    font-size: 17px;
    line-height: 1.86;
    color: var(--us-text);
}

.us-content p + p,
.us-section-card p + p,
.us-note p + p,
.us-cta-card p + p {
    margin-top: 16px;
}

.us-content + .us-section-stack,
.us-section-stack {
    margin-top: 38px;
}

.us-section-stack {
    display: grid;
    gap: 40px;
}

.us-section-stack > .us-section-card,
.us-section-stack > .us-list-card,
.us-section-stack > .us-note,
.us-section-stack > .us-cta-card {
    margin: 0;
}

.us-side-card h3,
.us-section-card h2,
.us-list-card h3,
.us-note h3,
.us-nav-card h3,
.us-cta-card h3 {
    margin: 0 0 16px;
    color: var(--us-text);
    line-height: 1.3;
}

.us-section-card h2 {
    font-size: 30px;
}

.us-side-card h3,
.us-list-card h3,
.us-note h3,
.us-nav-card h3,
.us-cta-card h3 {
    font-size: 26px;
}

.us-side-card ul,
.us-list-card ul,
.us-nav-card ul {
    margin: 0;
    padding-left: 20px;
}

.us-side-card li,
.us-list-card li,
.us-nav-card li {
    margin: 0 0 12px;
    color: var(--us-muted);
}

.us-card-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    margin-top: 28px;
}

.us-topic-card {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 26px;
    text-decoration: none;
    background: linear-gradient(180deg, #ffffff 0%, var(--us-surface-soft) 100%);
    border: 1px solid rgba(201, 211, 220, 0.9);
    border-radius: 24px;
    box-shadow: var(--us-shadow-soft);
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}

.us-topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--us-shadow);
    border-color: rgba(94, 118, 141, 0.30);
    background: linear-gradient(180deg, #ffffff 0%, #f8fbfd 100%);
}

.us-topic-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: var(--us-accent-soft);
    color: var(--us-accent-dark);
    font-size: 16px;
    font-weight: 800;
}

.us-topic-card h2 {
    margin: 0;
    font-size: 24px;
    line-height: 1.32;
    color: var(--us-text);
}

.us-topic-card p {
    margin: 0;
    color: var(--us-muted);
    font-size: 16px;
    line-height: 1.78;
}

.us-topic-link {
    margin-top: auto;
    color: var(--us-accent-dark);
    font-size: 15px;
    font-weight: 700;
}

.us-highlight {
    margin-top: 18px;
    padding: 17px 18px;
    border-left: 4px solid var(--us-warm-line);
    border-radius: 12px;
    background: var(--us-warm);
    color: #4b4f55;
}

.us-note {
    background: linear-gradient(180deg, #ffffff 0%, #fbfcfd 100%);
}

.us-disclaimer {
    margin-top: 30px;
    padding: 20px 22px;
    border-radius: 18px;
    background: #f7f9fb;
    border: 1px solid rgba(201, 211, 220, 0.9);
    color: var(--us-muted);
    font-size: 15px;
    line-height: 1.78;
}

.us-back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 14px;
    font-weight: 700;
}

.us-pill,
.us-mini-links a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 15px;
    border-radius: 999px;
    background: var(--us-accent-soft);
    border: 1px solid rgba(94, 118, 141, 0.12);
    color: var(--us-accent-dark);
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    transition: background .18s ease, border-color .18s ease, transform .18s ease;
}

.us-pill:hover,
.us-mini-links a:hover {
    background: #e8f0f5;
    border-color: rgba(94, 118, 141, 0.18);
    transform: translateY(-1px);
}

.us-mini-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

@media (max-width: 980px) {
    .us-grid,
    .us-card-grid {
        grid-template-columns: 1fr;
    }

    .us-main {
        padding-top: 0;
    }
}

@media (max-width: 640px) {
    :root {
        --us-wrap: min(100% - 20px, 1180px);
    }

    .us-hero,
    .us-article-hero {
        padding: 24px 0 22px;
        margin-bottom: 20px;
    }

    .us-hero-card,
    .us-article-card,
    .us-content,
    .us-section-card,
    .us-side-card,
    .us-list-card,
    .us-note,
    .us-nav-card,
    .us-cta-card {
        padding: 24px;
    }

    .us-section-card h2,
    .us-side-card h3,
    .us-list-card h3,
    .us-note h3,
    .us-nav-card h3,
    .us-cta-card h3 {
        font-size: 24px;
    }

    .us-main {
        padding-bottom: 56px;
    }
}
.us-hero,
.us-article-hero {
    position: relative;
    overflow: hidden;
    margin: 0 0 28px;
    padding: 38px 0 34px;
    background: radial-gradient(circle at 18% 22%, rgba(255,255,255,0.75) 0%, rgba(255,255,255,0.22) 20%, transparent 42%), radial-gradient(circle at 78% 16%, rgba(255,255,255,0.62) 0%, rgba(255,255,255,0.16) 18%, transparent 36%), radial-gradient(circle at 62% 58%, rgba(255,255,255,0.28) 0%, rgba(255,255,255,0.08) 18%, transparent 34%), linear-gradient(180deg, #edf3f8 0%, #e4ebf3 100%);
    border-bottom: 1px solid rgba(94, 118, 141, 0.08);
}

    .us-hero::before,
    .us-article-hero::before {
        content: "";
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse at 14% 24%, rgba(255,255,255,0.42) 0%, rgba(255,255,255,0.16) 24%, transparent 46%), radial-gradient(ellipse at 74% 18%, rgba(255,255,255,0.34) 0%, rgba(255,255,255,0.12) 22%, transparent 42%), radial-gradient(ellipse at 84% 54%, rgba(255,255,255,0.20) 0%, rgba(255,255,255,0.08) 18%, transparent 36%);
        filter: blur(16px);
        opacity: .95;
        pointer-events: none;
    }