:root {
    --color-primary: #5e6ad2;
    --color-primary-hover: #828fff;
    --color-primary-focus: #5e69d1;
    --color-on-primary: #ffffff;
    --color-ink: #f7f8f8;
    --color-ink-muted: #d0d6e0;
    --color-ink-subtle: #8a8f98;
    --color-ink-tertiary: #62666d;
    --color-canvas: #010102;
    --color-surface-1: #0f1011;
    --color-surface-2: #141516;
    --color-surface-3: #18191a;
    --color-hairline: #23252a;
    --color-hairline-strong: #34343a;
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 9999px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 48px;
    --space-section: 96px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.rh-body {
    background: var(--color-canvas);
    color: var(--color-ink);
    font-family: Inter, -apple-system, system-ui, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    line-height: 1.5;
    letter-spacing: -0.05px;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
    font-weight: 600;
    letter-spacing: -0.6px;
    line-height: 1.2;
    color: var(--color-ink);
}

h1 { font-size: 40px; letter-spacing: -1.0px; }
h2 { font-size: 28px; }
h3 { font-size: 22px; font-weight: 500; letter-spacing: -0.4px; }

p { color: var(--color-ink-muted); }

.rh-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.rh-topnav {
    background: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    position: sticky;
    top: 0;
    z-index: 50;
}

.rh-topnav-inner {
    max-width: 1280px;
    margin: 0 auto;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.rh-brand {
    font-weight: 600;
    font-size: 18px;
    letter-spacing: -0.3px;
}

.rh-brand span { color: var(--color-primary); }

.rh-nav-links {
    display: flex;
    gap: var(--space-lg);
    font-size: 14px;
}

.rh-nav-link { color: var(--color-ink-subtle); }
.rh-nav-link:hover, .rh-nav-link-active { color: var(--color-ink); }

.rh-nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.rh-nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--color-ink);
    display: block;
}

.rh-nav-mobile {
    display: none;
    flex-direction: column;
    padding: var(--space-md) 24px var(--space-lg);
    border-top: 1px solid var(--color-hairline);
    gap: var(--space-md);
}

.rh-nav-mobile.rh-open { display: flex; }

@media (max-width: 768px) {
    .rh-nav-links { display: none; }
    .rh-nav-toggle { display: flex; }
}

.rh-breadcrumb {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-md) 24px 0;
    font-size: 13px;
    color: var(--color-ink-subtle);
}

.rh-breadcrumb ol { display: flex; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.rh-breadcrumb li { display: flex; align-items: center; }
.rh-breadcrumb a { color: var(--color-ink-subtle); }
.rh-breadcrumb a:hover { color: var(--color-primary); }
.rh-breadcrumb-sep { margin: 0 8px; }

.rh-hero {
    padding: var(--space-xxl) 24px;
    max-width: 1280px;
    margin: 0 auto;
}

.rh-hero-eyebrow {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.4px;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: var(--space-md);
    display: block;
}

.rh-hero h1 { max-width: 800px; }

.rh-hero p.rh-lead {
    font-size: 18px;
    color: var(--color-ink-muted);
    max-width: 700px;
    margin-top: var(--space-md);
}

.rh-section {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-xxl) 24px;
}

.rh-section-title { margin-bottom: var(--space-lg); }

.rh-card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

@media (max-width: 1024px) { .rh-card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .rh-card-grid { grid-template-columns: 1fr; } }

.rh-card {
    background: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color 0.2s ease;
}

.rh-card:hover { border-color: var(--color-hairline-strong); }

.rh-card-img { width: 100%; height: 180px; object-fit: cover; }

.rh-card-body { padding: var(--space-lg); display: flex; flex-direction: column; gap: var(--space-xs); }

.rh-card-tag {
    font-size: 12px;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.rh-card-title { font-size: 20px; margin: 0; }

.rh-card-excerpt { font-size: 14px; color: var(--color-ink-subtle); margin: 0; }

.rh-card-date { font-size: 12px; color: var(--color-ink-tertiary); }

.rh-timeline { display: flex; flex-direction: column; gap: var(--space-xl); position: relative; padding-left: var(--space-xl); }

.rh-timeline::before {
    content: "";
    position: absolute;
    left: 15px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--color-hairline);
}

.rh-timeline-item { position: relative; display: flex; gap: var(--space-lg); }

.rh-timeline-marker {
    position: absolute;
    left: -32px;
    top: 0;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-pill);
    background: var(--color-surface-2);
    border: 1px solid var(--color-hairline-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--color-primary);
    font-weight: 500;
}

.rh-timeline-content h3 { margin: 0 0 8px; }
.rh-timeline-content p { margin: 0; font-size: 15px; }

.rh-related { margin-top: var(--space-xxl); }
.rh-related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }
@media (max-width: 1024px) { .rh-related-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .rh-related-grid { grid-template-columns: 1fr; } }

.rh-related-card {
    background: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.rh-related-card img { width: 100%; height: 100px; object-fit: cover; }
.rh-related-card span { padding: var(--space-sm); font-size: 13px; color: var(--color-ink-muted); }

.rh-toc {
    background: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
}

.rh-toc h2 { font-size: 16px; margin: 0 0 var(--space-sm); }
.rh-toc ul { margin: 0; padding-left: var(--space-lg); }
.rh-toc a { color: var(--color-ink-subtle); font-size: 14px; }
.rh-toc a:hover { color: var(--color-primary); }

.rh-prose { max-width: 760px; }
.rh-prose h2 { margin-top: var(--space-xl); }
.rh-prose h3 { margin-top: var(--space-lg); }
.rh-prose p { margin: var(--space-md) 0; }

.rh-faq-item {
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-sm);
    background: var(--color-surface-1);
}

.rh-faq-item summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--color-ink);
    list-style: none;
}

.rh-faq-item summary::-webkit-details-marker { display: none; }
.rh-faq-item summary::after { content: "+"; float: right; color: var(--color-primary); }
.rh-faq-item[open] summary::after { content: "−"; }
.rh-faq-item p { margin-top: var(--space-sm); font-size: 14px; }

.rh-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
}

.rh-btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.rh-btn-primary:hover { background: var(--color-primary-hover); }
.rh-btn-secondary { background: var(--color-surface-1); color: var(--color-ink); border: 1px solid var(--color-hairline); }

.rh-footer { background: var(--color-canvas); border-top: 1px solid var(--color-hairline); padding: 64px 24px 32px; }
.rh-footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-xl);
}
@media (max-width: 768px) { .rh-footer-inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .rh-footer-inner { grid-template-columns: 1fr; } }

.rh-footer-col h3 { font-size: 16px; margin: 0 0 var(--space-sm); }
.rh-footer-col h4 { font-size: 13px; color: var(--color-ink-subtle); text-transform: uppercase; letter-spacing: 0.4px; margin: 0 0 var(--space-sm); }
.rh-footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.rh-footer-col ul a { color: var(--color-ink-subtle); font-size: 14px; }
.rh-footer-col ul a:hover { color: var(--color-primary); }
.rh-footer-text { font-size: 13px; color: var(--color-ink-subtle); }
.rh-footer-disclaimer { font-size: 12px; color: var(--color-ink-tertiary); margin-top: var(--space-sm); }

.rh-footer-bottom {
    max-width: 1280px;
    margin: var(--space-xxl) auto 0;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-hairline);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.rh-footer-copy { font-size: 12px; color: var(--color-ink-tertiary); }

.rh-cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-surface-2);
    border-top: 1px solid var(--color-hairline-strong);
    padding: var(--space-lg) 24px;
    display: none;
    flex-wrap: wrap;
    gap: var(--space-md);
    align-items: center;
    justify-content: space-between;
    z-index: 100;
}

.rh-cookie-banner.rh-visible { display: flex; }
.rh-cookie-banner p { font-size: 13px; color: var(--color-ink-muted); margin: 0; max-width: 700px; }
.rh-cookie-actions { display: flex; gap: var(--space-sm); }

.rh-form { display: flex; flex-direction: column; gap: var(--space-md); max-width: 480px; }
.rh-form label { font-size: 13px; color: var(--color-ink-subtle); margin-bottom: 4px; display: block; }
.rh-form input {
    width: 100%;
    background: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    padding: 10px 12px;
    color: var(--color-ink);
    font-size: 14px;
}

.rh-form input:focus {
    outline: none;
    border-color: var(--color-primary-focus);
    box-shadow: 0 0 0 2px rgba(94,105,209,0.3);
}

.rh-form-error { font-size: 12px; color: #e5766c; margin-top: 4px; display: none; }
.rh-form-field.rh-invalid input { border-color: #e5766c; }
.rh-form-field.rh-invalid .rh-form-error { display: block; }

.rh-form-success {
    background: var(--color-surface-1);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    color: var(--color-ink);
    font-size: 14px;
    display: none;
}

.rh-form-success.rh-visible { display: block; }

.rh-disclaimer-block {
    background: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    font-size: 13px;
    color: var(--color-ink-subtle);
    margin: var(--space-lg) 0;
}

.rh-read-more-content { display: none; }
.rh-read-more-content.rh-visible { display: block; }
.rh-read-more-btn { color: var(--color-primary); font-size: 14px; cursor: pointer; background: none; border: none; padding: 0; margin-top: var(--space-sm); }

.rh-tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin: var(--space-md) 0; }
.rh-tag {
    background: var(--color-surface-2);
    color: var(--color-ink-muted);
    font-size: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
}