:root {
    --bg: #0f0f15;
    --bg-surface: #181820;
    --bg-card: #1c1c26;
    --bg-elevated: #22222e;
    --text: #e4e1dc;
    --text-secondary: #9b9690;
    --text-muted: #6b6662;
    --accent: #c4a67a;
    --accent-soft: #c4a67a22;
    --accent-hover: #d9bd94;
    --accent-dim: #8b7355;
    --border: #2a2a36;
    --border-subtle: #22222c;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.55);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Consolas', monospace;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --content-text-width: 680px;
    --content-image-width: 820px;
    --topbar-height: 52px;
    --sidebar-width: 240px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    letter-spacing: 0.01em;
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #3a3a48;
}

/* ── Страницы ──────────────────────── */
.page {
    display: none;
    min-height: 100vh;
    animation: fadeSlideIn 0.45s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}
.page.active {
    display: block;
}

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Topbar (только для дочерних страниц) ── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 16px;
    height: var(--topbar-height);
    padding: 0 28px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.topbar__home-link {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 0.82rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition);
    cursor: pointer;
    user-select: none;
    background: none;
    border: none;
    font-family: var(--font);
    letter-spacing: 0.02em;
    padding: 0;
}
.topbar__home-link:hover {
    color: var(--accent);
}
.topbar__home-link svg {
    width: 15px;
    height: 15px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.8;
}
.topbar__title {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.03em;
    user-select: none;
}

/* ── Основная сетка дочерней страницы ───── */
.page-layout {
    display: flex;
    min-height: calc(100vh - var(--topbar-height));
}

/* ── Сайдбар (всегда видимый) ──────────── */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    padding: 24px 0;
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    overflow-y: auto;
    flex-shrink: 0;
}
.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    font-size: 0.84rem;
    color: var(--text);
    text-decoration: none;
    transition: all 0.18s ease;
    cursor: pointer;
    letter-spacing: 0.02em;
    white-space: nowrap;
}
.sidebar-link:hover {
    background: var(--accent-soft);
    color: var(--accent-hover);
}
.sidebar-link.active-link {
    color: var(--accent);
    font-weight: 500;
    pointer-events: none;
    background: var(--accent-soft);
}
.sidebar-link .dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
    opacity: 0.5;
    transition: opacity 0.2s;
}
.sidebar-link:hover .dot {
    opacity: 1;
}
.sidebar-link.active-link .dot {
    opacity: 1;
    background: var(--accent);
}

/* ── Контент дочерней страницы ──────────── */
.page-content {
    flex: 1;
    padding: 48px 32px 80px;
    max-width: 900px;
    /* Контент естественно ограничен шириной текстовых элементов */
}

/* ── Главная страница ──────────────────── */
.home-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 60px 32px;
    text-align: center;
}
.home__eyebrow {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent-dim);
    margin-bottom: 20px;
    font-weight: 500;
}
.home__title {
    font-size: 2.6rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 10px;
    line-height: 1.2;
}
.home__title span {
    color: var(--accent);
}
.home__subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 56px;
    font-weight: 400;
    max-width: 500px;
    line-height: 1.5;
}
.home__divider {
    width: 40px;
    height: 1px;
    background: var(--accent-dim);
    margin: 0 auto 48px;
    opacity: 0.5;
}
.home__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    max-width: 620px;
    width: 100%;
}
@media (max-width: 600px) {
    .home__grid {
        grid-template-columns: 1fr;
        max-width: 340px;
    }
    .home__title {
        font-size: 1.8rem;
    }
}
.home__card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    padding: 24px 22px 22px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
    user-select: none;
}
.home__card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}
.home__card:hover {
    border-color: var(--accent-dim);
    background: var(--bg-elevated);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.home__card:hover::before {
    opacity: 0.8;
}
.home__card-icon {
    font-size: 1.5rem;
    margin-bottom: 14px;
    opacity: 0.7;
    transition: opacity var(--transition);
    letter-spacing: 0;
}
.home__card:hover .home__card-icon {
    opacity: 1;
}
.home__card-title {
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    margin-bottom: 4px;
    color: var(--text);
    transition: color var(--transition);
}
.home__card:hover .home__card-title {
    color: var(--accent-hover);
}
.home__card-desc {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.4;
    letter-spacing: 0.02em;
}
.home__footer {
    margin-top: 56px;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    opacity: 0.5;
}

/* ── Типографика внутри контента ───────── */
.page-content h2 {
    font-size: 1.55rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text);
    margin: 48px 0 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-subtle);
    text-align: left;
    max-width: var(--content-text-width);
}
.page-content h2:first-child {
    margin-top: 8px;
}
.page-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    margin: 32px 0 10px;
    text-align: left;
    max-width: var(--content-text-width);
    letter-spacing: 0.01em;
}
.page-content p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 16px;
    text-align: left;
    max-width: var(--content-text-width);
    letter-spacing: 0.015em;
}
.text-block {
    max-width: var(--content-text-width);
    text-align: left;
    margin-bottom: 20px;
}
.text-block p {
    margin-bottom: 12px;
}
li {
    font-size: 0.92rem;
    line-height: 1.75;
    margin-bottom: 6px;
    margin-left: 16px;
    text-align: left;
    max-width: var(--content-text-width);
    letter-spacing: 0.015em;
}
/* ── Изображения ──────────────────────── */
.image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    max-width: var(--content-image-width);
    width: 100%;
    margin: 32px auto;
    padding: 48px 24px;
    background: var(--bg-card);
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    cursor: default;
    user-select: none;
    position: relative;
}
.image-placeholder:hover {
    border-color: var(--accent-dim);
    background: #1e1e2a;
}
.image-placeholder__icon {
    width: 48px; height: 48px;
    margin-bottom: 12px;
    opacity: 0.35;
    transition: opacity var(--transition);
    stroke: var(--text-muted);
    fill: none;
    stroke-width: 1.2;
}
.image-placeholder:hover .image-placeholder__icon {
    opacity: 0.6;
}
.image-placeholder__label {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color var(--transition);
}
.image-placeholder:hover .image-placeholder__label {
    color: var(--accent-dim);
}
.image-placeholder__caption {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 8px;
    font-style: italic;
    letter-spacing: 0.02em;
    opacity: 0.6;
    text-align: center;
    max-width: 400px;
}

/* ── Код ──────────────────────────────── */
.code-placeholder {
    max-width: var(--content-text-width);
    margin: 20px 0 28px;
    padding: 18px 20px;
    background: #14141d;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    line-height: 1.6;
    text-align: left;
    overflow-x: auto;
    user-select: none;
}
.code-placeholder span {
    color: var(--accent-dim);
}

/* ── Врезка (callout) ─────────────────── */
.callout {
    max-width: var(--content-text-width);
    margin: 24px 0;
    padding: 16px 20px;
    background: var(--accent-soft);
    border-left: 2px solid var(--accent-dim);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    text-align: left;
}
.callout strong {
    color: var(--accent);
    font-weight: 600;
}

/* ── Сетка ссылок ─────────────────────── */
.links-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    max-width: var(--content-text-width);
    margin: 24px 0;
}
@media (max-width: 600px) {
    .links-grid {
        grid-template-columns: 1fr;
    }
}
.link-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    transition: all var(--transition);
    cursor: pointer;
    letter-spacing: 0.02em;
    font-size: 0.88rem;
}
.link-card:hover {
    border-color: var(--accent-dim);
    background: var(--bg-elevated);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}
.link-card__icon {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--bg-elevated);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.85rem;
    color: var(--accent-dim);
    transition: color var(--transition);
}
.link-card:hover .link-card__icon {
    color: var(--accent);
}
.link-card__info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.link-card__title {
    font-weight: 500;
    font-size: 0.84rem;
    color: var(--text);
}
.link-card__url {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}

/* ── Адаптив: сайдбар становится горизонтальным ── */
@media (max-width: 768px) {
    .page-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        padding: 12px 16px;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
        overflow-y: visible;
    }
    .sidebar-link {
        padding: 8px 12px;
        font-size: 0.8rem;
        white-space: nowrap;
    }
    .page-content {
        padding: 24px 16px 48px;
    }
}