/* ==== Tokens (safe fallbacks) ==== */
:root {

    --gap-lg: var(--spacing-lg, 24px);
    --gap-md: var(--spacing-md, 16px);
    --gap-sm: var(--spacing-sm, 12px);
    --radius: var(--stn-radius, 10px);
    --shadow: var(--stn-shadow, 0 6px 28px rgba(0, 0, 0, .12));
    --c-bg: var(--color-bg-alt, #101317);
    --c-line: var(--color-secondary, #2b8aef);
    --c-text: var(--text-primary, #eaeef5);
    --c-text-weak: var(--text-secondary, #b8c2cc);
    --c-on: var(--text-on-primary, #0b1116);
    /* Layering knobs */
    --z-aside: 850;
    /* desktop sticky aside */
    --z-toggle: 1260;
    /* little floating button */
    --z-drawer: 1400;
    /* full-screen mobile drawer */
}

/* ==== Layout wrapper: place aside left of main and center both ==== */
.poutline-layout {
    display: grid;
    grid-template-columns: var(--aside-w) minmax(0, var(--main-w));
    gap: var(--gap-lg);
    max-width: calc(var(--aside-w) + var(--main-w) + var(--gap-lg));
    margin: var(--gap-lg) auto;
    padding: 0 var(--gap-md);
}

.poutline-layout>main {
    max-width: 100%;
    margin: 0;
    padding: 0;
}

.poutline {
    /* allow the grid row to determine the height so the sticky child can stick across the page */
    align-self: stretch;
    /* <-- changed from start */
    position: static;
    /* ensure no positioning creates a new containing block */
    z-index: var(--z-aside);
}

/* sticky panel: stays in normal flow, scrolls until it reaches top, then sticks */
.poutline-panel {
    position: sticky;
    top: var(--gap-lg);
    /* offset from viewport top when stuck; adjust if you have a fixed header */
    background: var(--c-bg);
    /* border: 1px solid var(--c-line); */
    border-radius: var(--radius);
    padding: var(--gap-sm) var(--gap-sm);
    /* corrected calc syntax so browsers don't ignore it */
    max-height: calc(100vh - (2 * var(--gap-lg)));
    overflow: auto;
    /* keep z-index only if you need it on the panel itself */
    z-index: var(--z-aside);
}

#poutline-panel {
    overflow-y: auto;
    scrollbar-width: thin;
    /* Firefox */
    scrollbar-color: #999 #f0f0f0;
    /* thumb + track colors */
}

/* Chrome, Edge, Safari */
#poutline-panel::-webkit-scrollbar {
    width: 3px;
    /* thin width */
}

#poutline-panel::-webkit-scrollbar-track {
    background: #f0f0f0;
    /* track color */
}

#poutline-panel::-webkit-scrollbar-thumb {
    background-color: #999;
    /* thumb color */
    border-radius: 3px;
    /* rounded edges */
}

/* Title */
.poutline-title {
    margin: 0 0 .4rem 0;
    font: 600 0.95rem/1.2 var(--font-heading, ui-sans-serif);
    color: var(--c-text);
}

/* ==== List + “timeline” look ==== */
.poutline-list {
    list-style: none;
    margin: 0;
    padding: 0 0 0 .75rem;
    position: relative;
}

.poutline-list::before {
    content: "";
    position: absolute;
    left: 0;
    top: .2rem;
    bottom: .2rem;
    width: 2px;
    background: linear-gradient(180deg, var(--c-line), transparent 80%);
    opacity: .8;
}

.poutline-item {
    position: relative;
    /* margin: .25rem 0 .15rem; */
}

.poutline-item::before {
    content: "";
    position: absolute;
    left: -0.9rem;
    top: .6rem;
    width: .5rem;
    height: .5rem;
    border-radius: 999px;
    background: var(--c-line);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--c-line) 30%, transparent);
}

.poutline-link {
    display: block;
    padding: .15rem .2rem;
    border-radius: 6px;
    text-decoration: none;
    color: var(--c-text);
    font-size: var(--font-size-base);
    transition: background-color .18s ease, color .18s ease;
}

/* Truncate long titles to ~30 characters in the aside only */
.poutline-panel .poutline-link {
    max-width: 30ch;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.poutline-link:hover,
.poutline-link:focus-visible {
    background: color-mix(in srgb, var(--c-line) 18%, transparent);
    outline: none;
}

/* Existing */
.poutline-link.visible {
    background: color-mix(in srgb, var(--c-line) 15%, transparent);
    color: var(--c-text);
    border-radius: 1px !important;
}

/* Force visible highlight */
.poutline-link[aria-current="true"] {
    background: var(--c-line) !important;
    color: var(--c-on) !important;
    font-size: calc(var(--font-size-base) + 0.01rem) !important;
    font-weight: 500 !important;
    border-left: 2px solid var(--color-accent);
    padding-left: .5rem;
    transition: all .25s ease;
    border-radius: 1px !important;
}

/* Nesting indent */
.poutline-l1 {
    /* padding-left: .25rem; */
}

.poutline-l2 {
    padding-left: .75rem;
}

.poutline-l3 {
    padding-left: 1.75rem;
}

.poutline-l4 {
    padding-left: 2.75rem;
}

.poutline-l5 {
    padding-left: 2.0rem;
}

.poutline-l6 {
    padding-left: 2.5rem;
}

.poutline-l4 a,
.poutline-l5 a,
.poutline-l6 a {
    color: color-mix(in srgb, var(--text-on-bg) 1%, gray);
}

/* Make in-page jumps land below fixed headers */
.poutline-scroll-target {
    scroll-margin-top: calc(var(--gap-lg) + 8px);
}

/* ==== Drawer (small screens) ==== */
.poutline-toggle {
    display: none;
    position: fixed;
    /* inset: auto auto auto var(--gap-md);
    top: var(--gap-md); */
    top: 2%;
    right: 3%;
    width: 24%;
    z-index: var(--z-toggle);
    background: var(--c-bg);
    color: var(--c-text);
    border: 1px solid var(--c-line);
    border-radius: var(--radius);
    padding: .45rem .65rem;
    font: 500 .9rem var(--font-heading, ui-sans-serif);
    cursor: pointer;
}

.poutline-drawer {
    position: fixed;
    inset: 0;
    z-index: var(--z-drawer);
    display: grid;
    grid-template-rows: auto 1fr;
    background: var(--c-bg);
    color: var(--c-text);
    transform: translateY(6px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
}

.poutline-drawer.is-open {
    transform: none;
    opacity: 1;
    visibility: visible;
}

.poutline-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: .75rem var(--gap-md);
    border-bottom: 1px solid color-mix(in srgb, var(--c-line) 40%, transparent);
}

.poutline-close {
    background: transparent;
    border: 1px solid var(--c-line);
    color: var(--c-text);
    border-radius: 8px;
    padding: .35rem .55rem;
    cursor: pointer;
}

.poutline-drawer__body {
    overflow: auto;
    padding: .75rem var(--gap-md) var(--gap-md);
}

/* ==== Responsiveness ==== */
/* Narrow desktop and below: collapse aside into button + drawer */
@media (max-width: 1199px) {
    .poutline-layout {
        display: block;
        max-width: calc(var(--main-w) + 2*var(--gap-md));
    }

    .poutline {
        display: none;
    }

    .poutline-toggle {
        display: inline-block;
    }
}

/* Phone tweaks */
@media (max-width: 640px) {
    .poutline-link {
        font-size: .94rem;
    }
}

/* Optional: lock background scroll when drawer is open */
html.poutline-lock,
body.poutline-lock {
    overflow: hidden;
}