:root {
    --lf-primary: #000000;
    --lf-on-primary: #ffffff;
    --lf-ink: #000000;
    --lf-body: #5e5e5e;
    --lf-mute: #afafaf;
    --lf-hairline: #4b4b4b;
    --lf-canvas: #ffffff;
    --lf-canvas-soft: #efefef;
    --lf-canvas-softer: #f3f3f3;
    --lf-pressed: #e2e2e2;
    --lf-link: #0000ee;
    --lf-elevated: #282828;
    --lf-radius-md: 8px;
    --lf-radius-lg: 12px;
    --lf-radius-xl: 16px;
    --lf-radius-pill: 999px;
    --lf-sp-xxs: 4px;
    --lf-sp-xs: 6px;
    --lf-sp-sm: 8px;
    --lf-sp-md: 12px;
    --lf-sp-lg: 16px;
    --lf-sp-xl: 20px;
    --lf-sp-2xl: 24px;
    --lf-sp-3xl: 32px;
    --lf-sidebar-width: 264px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', system-ui, 'Helvetica Neue', Arial, sans-serif;
    color: var(--lf-ink);
    background: var(--lf-canvas);
    margin: 0;
    padding-left: var(--lf-sidebar-width);
}

h1, h2, h3, h4 {
    font-family: 'Inter', system-ui, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: none;
    margin: 0 0 var(--lf-sp-sm);
}

p { color: var(--lf-body); line-height: 1.6; }

a { color: var(--lf-ink); text-decoration: none; }

.lf-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--lf-sidebar-width);
    background: var(--lf-canvas);
    border-right: 1px solid var(--lf-pressed);
    padding: var(--lf-sp-2xl) var(--lf-sp-lg);
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-2xl);
    z-index: 100;
}

.lf-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--lf-ink);
}

.lf-brand span { color: var(--lf-mute); }

.lf-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-xs);
    flex: 1;
}

.lf-sidebar-nav a {
    padding: var(--lf-sp-md) var(--lf-sp-lg);
    border-radius: var(--lf-radius-pill);
    font-size: 16px;
    font-weight: 500;
    color: var(--lf-ink);
}

.lf-sidebar-nav a:hover,
.lf-sidebar-nav a.active {
    background: var(--lf-canvas-soft);
}

.lf-sidebar-cta {
    background: var(--lf-primary);
    color: var(--lf-on-primary);
    text-align: center;
    padding: var(--lf-sp-md);
    border-radius: var(--lf-radius-pill);
    font-weight: 500;
    font-size: 16px;
}

.lf-burger {
    display: none;
    position: fixed;
    top: var(--lf-sp-lg);
    left: var(--lf-sp-lg);
    z-index: 200;
    width: 44px;
    height: 44px;
    background: var(--lf-canvas);
    border: 1px solid var(--lf-pressed);
    border-radius: var(--lf-radius-pill);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
}

.lf-burger span {
    width: 18px;
    height: 2px;
    background: var(--lf-ink);
}

.lf-hero {
    background: var(--lf-canvas);
    padding: var(--lf-sp-3xl);
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-lg);
    max-width: 780px;
}

.lf-hero h1 {
    font-size: 52px;
    line-height: 64px;
    font-weight: 700;
}

.lf-hero p {
    font-size: 18px;
    line-height: 24px;
    font-weight: 500;
    color: var(--lf-body);
}

.lf-btn-primary {
    display: inline-block;
    background: var(--lf-primary);
    color: var(--lf-on-primary);
    padding: var(--lf-sp-md) var(--lf-sp-xl);
    border-radius: var(--lf-radius-pill);
    font-weight: 500;
    font-size: 16px;
    width: fit-content;
}

.lf-btn-secondary {
    display: inline-block;
    background: var(--lf-canvas-soft);
    color: var(--lf-ink);
    padding: var(--lf-sp-md) var(--lf-sp-lg);
    border-radius: var(--lf-radius-pill);
    font-weight: 500;
    font-size: 16px;
    width: fit-content;
}

.lf-section {
    padding: var(--lf-sp-3xl);
}

.lf-section h2 {
    font-size: 36px;
    line-height: 44px;
    margin-bottom: var(--lf-sp-2xl);
}

.lf-category-tag {
    display: inline-block;
    background: var(--lf-canvas-soft);
    padding: var(--lf-sp-sm) var(--lf-sp-lg);
    border-radius: var(--lf-radius-pill);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: var(--lf-sp-lg);
}

.lf-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--lf-sp-2xl);
}

.lf-card {
    background: var(--lf-canvas);
    border-radius: var(--lf-radius-xl);
    overflow: hidden;
    border: 1px solid var(--lf-pressed);
    display: flex;
    flex-direction: column;
}

.lf-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.lf-card-body {
    padding: var(--lf-sp-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-sm);
    flex: 1;
}

.lf-tag {
    display: inline-block;
    background: var(--lf-canvas-soft);
    padding: var(--lf-sp-xs) var(--lf-sp-md);
    border-radius: var(--lf-radius-pill);
    font-size: 12px;
    font-weight: 500;
    width: fit-content;
}

.lf-card-body h3 { font-size: 20px; line-height: 28px; }

.lf-band-dark {
    background: var(--lf-primary);
    color: var(--lf-on-primary);
    padding: var(--lf-sp-3xl);
}

.lf-band-dark h2, .lf-band-dark p { color: var(--lf-on-primary); }

.lf-breadcrumbs {
    padding: var(--lf-sp-lg) var(--lf-sp-3xl) 0;
}

.lf-breadcrumbs ol {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--lf-sp-xs);
    padding: 0;
    margin: 0;
    font-size: 14px;
    color: var(--lf-hairline);
}

.lf-breadcrumbs li:not(:last-child)::after {
    content: '/';
    margin-left: var(--lf-sp-xs);
    color: var(--lf-mute);
}

.lf-breadcrumbs a { color: var(--lf-hairline); }

.lf-article-layout {
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: var(--lf-sp-3xl);
    padding: var(--lf-sp-3xl);
    align-items: start;
}

.lf-article-main img {
    width: 100%;
    border-radius: var(--lf-radius-xl);
    aspect-ratio: 4 / 3;
    object-fit: cover;
    margin-bottom: var(--lf-sp-2xl);
}

.lf-article-main h1 {
    font-size: 36px;
    line-height: 44px;
}

.lf-article-main h2 {
    font-size: 24px;
    line-height: 32px;
    margin-top: var(--lf-sp-2xl);
}

.lf-toc {
    background: var(--lf-canvas-soft);
    border-radius: var(--lf-radius-xl);
    padding: var(--lf-sp-2xl);
    position: sticky;
    top: var(--lf-sp-2xl);
}

.lf-toc-title {
    display: block;
    font-weight: 500;
    font-size: 14px;
    margin-bottom: var(--lf-sp-md);
}

.lf-toc ol {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-sm);
}

.lf-toc a { font-size: 14px; color: var(--lf-hairline); }

.lf-faq {
    margin-top: var(--lf-sp-2xl);
}

.lf-faq-row {
    padding: var(--lf-sp-lg) 0;
    border-top: 1px solid var(--lf-pressed);
}

.lf-faq-row summary {
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
}

.lf-faq-row p {
    margin-top: var(--lf-sp-sm);
}

.lf-related {
    padding: 0 var(--lf-sp-3xl) var(--lf-sp-3xl);
}

.lf-related h2 {
    font-size: 24px;
    margin-bottom: var(--lf-sp-lg);
}

.lf-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--lf-sp-lg);
}

.lf-related-card {
    background: var(--lf-canvas);
    border: 1px solid var(--lf-pressed);
    border-radius: var(--lf-radius-xl);
    overflow: hidden;
}

.lf-related-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.lf-related-card-body {
    padding: var(--lf-sp-lg);
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-xs);
}

.lf-related-card-body h3 { font-size: 16px; }

.lf-footer {
    background: var(--lf-primary);
    color: var(--lf-on-primary);
    padding: var(--lf-sp-3xl);
}

.lf-footer-inner {
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-lg);
}

.lf-footer-brand { font-size: 20px; font-weight: 700; }
.lf-footer-brand span { color: var(--lf-mute); }

.lf-footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--lf-sp-lg);
}

.lf-footer-links a { color: var(--lf-on-primary); font-size: 14px; }

.lf-footer-disclaimer, .lf-footer-copy {
    font-size: 12px;
    color: var(--lf-mute);
    max-width: 720px;
}

.lf-page {
    padding: var(--lf-sp-3xl);
    max-width: 800px;
}

.lf-page h1 { font-size: 36px; margin-bottom: var(--lf-sp-lg); }

.lf-form {
    display: flex;
    flex-direction: column;
    gap: var(--lf-sp-lg);
    max-width: 480px;
}

.lf-form input, .lf-form textarea {
    background: var(--lf-canvas-soft);
    border: none;
    border-radius: var(--lf-radius-md);
    padding: var(--lf-sp-lg);
    font-size: 16px;
    font-family: inherit;
}

.lf-form button {
    background: var(--lf-primary);
    color: var(--lf-on-primary);
    border: none;
    padding: var(--lf-sp-lg) var(--lf-sp-xl);
    border-radius: var(--lf-radius-xl);
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    width: fit-content;
}

.lf-form-message {
    display: none;
    background: var(--lf-canvas-soft);
    border-radius: var(--lf-radius-md);
    padding: var(--lf-sp-lg);
    font-size: 14px;
}

.lf-cookie-banner {
    display: none;
    position: fixed;
    bottom: var(--lf-sp-lg);
    left: calc(var(--lf-sidebar-width) + var(--lf-sp-lg));
    right: var(--lf-sp-lg);
    background: var(--lf-ink);
    color: var(--lf-on-primary);
    border-radius: var(--lf-radius-xl);
    padding: var(--lf-sp-lg) var(--lf-sp-2xl);
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: var(--lf-sp-lg);
    z-index: 300;
    box-shadow: rgba(0, 0, 0, 0.16) 0px 4px 16px 0px;
}

.lf-cookie-banner.visible { display: flex; }

.lf-cookie-banner p { color: var(--lf-on-primary); font-size: 14px; margin: 0; }

.lf-cookie-banner button {
    background: var(--lf-canvas);
    color: var(--lf-ink);
    border: none;
    padding: var(--lf-sp-sm) var(--lf-sp-lg);
    border-radius: var(--lf-radius-pill);
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}

@media (max-width: 1119px) {
    body { padding-left: 0; }
    .lf-sidebar {
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        box-shadow: rgba(0, 0, 0, 0.16) 0px 4px 16px 0px;
    }
    .lf-sidebar.open { transform: translateX(0); }
    .lf-burger { display: flex; }
    .lf-article-layout { grid-template-columns: 1fr; }
    .lf-toc { position: static; }
    .lf-cookie-banner { left: var(--lf-sp-lg); flex-direction: column; align-items: stretch; }
}

@media (max-width: 600px) {
    .lf-hero h1 { font-size: 36px; line-height: 44px; }
    .lf-section, .lf-page, .lf-article-layout, .lf-hero, .lf-band-dark, .lf-footer { padding: var(--lf-sp-lg); }
    .lf-breadcrumbs { padding: var(--lf-sp-lg) var(--lf-sp-lg) 0; }
}