:root {
    --ig-bg: #f4f7fb;
    --ig-sidebar: #111722;
    --ig-sidebar-2: #171f2d;
    --ig-sidebar-active: #263a5b;
    --ig-blue: #3488ff;
    --ig-blue-soft: #eaf3ff;
    --ig-text: #1c2638;
    --ig-muted: #6f7a8d;
    --ig-border: #e1e7f0;
    --ig-card: #ffffff;
    --ig-code-bg: #111827;
    --ig-code-text: #edf4ff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--ig-bg);
    color: var(--ig-text);
    font-family: Arial, Helvetica, sans-serif;
}

.ig-shell {
    display: grid;
    grid-template-columns: 300px 1fr;
    min-height: 100vh;
}

.ig-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    background: linear-gradient(180deg, #121824 0%, #0f141f 100%);
    color: #ffffff;
    overflow-y: auto;
    border-right: 1px solid rgba(255,255,255,.08);
}

.ig-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 22px 22px 18px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.ig-brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: linear-gradient(135deg, #2d86ff, #7a49ff);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.ig-brand strong {
    display: block;
    font-size: 22px;
    line-height: 1;
}

.ig-brand span {
    display: block;
    margin-top: 5px;
    color: #f6cc28;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.ig-search {
    margin: 18px;
    position: relative;
}

    .ig-search i {
        position: absolute;
        left: 13px;
        top: 50%;
        transform: translateY(-50%);
        color: #9aa6ba;
    }

    .ig-search input {
        width: 100%;
        height: 42px;
        border: 1px solid rgba(255,255,255,.1);
        background: rgba(255,255,255,.06);
        color: #ffffff;
        border-radius: 12px;
        padding: 0 12px 0 38px;
        outline: none;
    }

        .ig-search input::placeholder {
            color: #8792a6;
        }

.ig-nav {
    padding: 8px 0 30px;
}

.ig-nav-section {
    padding: 22px 22px 9px;
    color: #ffffff;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: .1em;
    text-transform: uppercase;
    opacity: .9;
}

.ig-nav-item {
    color: #dce4f2;
}

.ig-nav-link {
    min-height: 48px;
    padding: 0 18px 0 22px;
    color: inherit;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    border-left: 3px solid transparent;
}

    .ig-nav-link:hover {
        background: rgba(255,255,255,.045);
        color: #ffffff;
    }

.ig-nav-item.active > .ig-nav-link {
    background: var(--ig-sidebar-active);
    color: #ffffff;
    border-left-color: var(--ig-blue);
    font-weight: 800;
}

.ig-nav-left {
    display: flex;
    align-items: center;
    gap: 13px;
    min-width: 0;
}

    .ig-nav-left i {
        width: 18px;
        text-align: center;
        color: rgba(255,255,255,.84);
    }

    .ig-nav-left span {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

.ig-nav-arrow {
    font-size: 12px;
    color: #72afff;
    transition: transform .2s ease;
}

.ig-nav-item.open > .ig-nav-link .ig-nav-arrow {
    transform: rotate(180deg);
}

.ig-nav-children {
    display: none;
    padding: 6px 0;
    background: rgba(0,0,0,.1);
}

.ig-nav-item.open > .ig-nav-children {
    display: block;
}

.ig-nav-children .ig-nav-link {
    padding-left: 42px;
    min-height: 42px;
    font-size: 14px;
}

.ig-nav-children .ig-nav-children .ig-nav-link {
    padding-left: 62px;
}

.ig-main {
    min-width: 0;
}

.ig-topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    height: 68px;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--ig-border);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 28px;
}

.ig-menu-btn {
    display: none;
    border: 1px solid var(--ig-border);
    background: #ffffff;
    color: var(--ig-text);
    width: 42px;
    height: 42px;
    border-radius: 12px;
    cursor: pointer;
}

.ig-breadcrumb {
    display: flex;
    align-items: center;
    gap: 9px;
    color: var(--ig-muted);
    font-size: 14px;
    min-width: 0;
    flex: 1;
}

    .ig-breadcrumb a {
        color: var(--ig-blue);
        text-decoration: none;
        font-weight: 700;
    }

    .ig-breadcrumb strong {
        color: var(--ig-text);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

.ig-language {
    display: flex;
    gap: 6px;
    padding: 5px;
    border: 1px solid var(--ig-border);
    background: #ffffff;
    border-radius: 12px;
}

    .ig-language a {
        text-decoration: none;
        color: var(--ig-muted);
        padding: 7px 10px;
        border-radius: 9px;
        font-size: 12px;
        font-weight: 900;
    }

        .ig-language a.active {
            color: #ffffff;
            background: var(--ig-blue);
        }

.ig-layout {
    max-width: 1360px;
    margin: 0 auto;
    padding: 34px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 28px;
    align-items: start;
}

.ig-content {
    background: var(--ig-card);
    border: 1px solid var(--ig-border);
    border-radius: 20px;
    padding: 42px;
    box-shadow: 0 12px 34px rgba(28,38,56,.06);
}

    .ig-content h1 {
        margin: 0 0 18px;
        font-size: 38px;
        line-height: 1.2;
        letter-spacing: -0.04em;
    }

    .ig-content h2 {
        margin: 38px 0 14px;
        padding-top: 10px;
        font-size: 26px;
        line-height: 1.25;
        letter-spacing: -0.03em;
    }

    .ig-content h3 {
        margin: 28px 0 10px;
        font-size: 20px;
    }

    .ig-content p {
        color: #4b5870;
        line-height: 1.75;
        font-size: 16px;
    }

    .ig-content ul,
    .ig-content ol {
        color: #4b5870;
        line-height: 1.8;
    }

    .ig-content a {
        color: var(--ig-blue);
        font-weight: 700;
    }

    .ig-content code {
        background: #eef3fa;
        border: 1px solid #dce5f1;
        padding: 2px 6px;
        border-radius: 6px;
        font-family: Consolas, Monaco, "Courier New", monospace;
        font-size: .92em;
    }

    .ig-content pre {
        position: relative;
        background: var(--ig-code-bg);
        color: var(--ig-code-text);
        padding: 20px;
        border-radius: 16px;
        overflow-x: auto;
        line-height: 1.65;
        font-family: Consolas, Monaco, "Courier New", monospace;
    }

        .ig-content pre code {
            background: transparent;
            border: 0;
            color: inherit;
            padding: 0;
        }

    .ig-content table {
        width: 100%;
        border-collapse: separate;
        border-spacing: 0;
        border: 1px solid var(--ig-border);
        border-radius: 14px;
        overflow: hidden;
        margin: 20px 0;
    }

    .ig-content th,
    .ig-content td {
        padding: 14px 16px;
        border-bottom: 1px solid var(--ig-border);
        text-align: left;
        vertical-align: top;
    }

    .ig-content th {
        background: #f7f9fd;
        font-weight: 900;
    }

    .ig-content tr:last-child td {
        border-bottom: 0;
    }

    .ig-content blockquote {
        margin: 22px 0;
        padding: 18px 20px;
        border-left: 4px solid var(--ig-blue);
        background: var(--ig-blue-soft);
        border-radius: 12px;
        color: #31506f;
    }

.ig-toc {
    position: sticky;
    top: 92px;
    background: var(--ig-card);
    border: 1px solid var(--ig-border);
    border-radius: 18px;
    padding: 20px;
    box-shadow: 0 12px 34px rgba(28,38,56,.045);
}

.ig-toc-title {
    font-size: 13px;
    font-weight: 900;
    color: var(--ig-text);
    text-transform: uppercase;
    letter-spacing: .06em;
    margin-bottom: 12px;
}

.ig-toc a {
    display: block;
    color: var(--ig-muted);
    text-decoration: none;
    font-size: 14px;
    padding: 7px 0;
    border-left: 2px solid transparent;
}

    .ig-toc a:hover {
        color: var(--ig-blue);
    }

    .ig-toc a.h3 {
        padding-left: 14px;
        font-size: 13px;
    }

.ig-copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    border: 1px solid rgba(255,255,255,.16);
    background: rgba(255,255,255,.08);
    color: #ffffff;
    border-radius: 8px;
    padding: 6px 9px;
    font-size: 12px;
    cursor: pointer;
}

@media (max-width: 1100px) {
    .ig-layout {
        grid-template-columns: 1fr;
    }

    .ig-toc {
        display: none;
    }
}

@media (max-width: 860px) {
    .ig-shell {
        grid-template-columns: 1fr;
    }

    .ig-sidebar {
        position: fixed;
        left: -310px;
        top: 0;
        width: 300px;
        z-index: 100;
        transition: left .2s ease;
    }

    body.ig-sidebar-open .ig-sidebar {
        left: 0;
    }

    .ig-menu-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .ig-layout {
        padding: 20px;
    }

    .ig-content {
        padding: 28px;
    }

        .ig-content h1 {
            font-size: 30px;
        }
}