:root {
    color-scheme: dark;
    --page: #07111f;
    --page-deep: #040a13;
    --surface: #0d1a2b;
    --surface-2: #122238;
    --surface-3: #182b45;
    --ink: #eef5ff;
    --muted: #8fa2ba;
    --line: rgba(151, 174, 207, 0.18);
    --line-strong: rgba(151, 174, 207, 0.32);
    --pre: #8ea2ff;
    --pre-soft: rgba(123, 145, 255, 0.14);
    --post: #55d8c7;
    --post-soft: rgba(85, 216, 199, 0.13);
    --concept: #ffc96f;
    --concept-soft: rgba(255, 201, 111, 0.13);
    --danger: #ff8192;
    --content: 1240px;
    --radius: 20px;
    --radius-lg: 30px;
    --shadow: 0 30px 90px rgba(0, 0, 0, 0.34);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background: var(--page-deep);
}

body {
    min-width: 320px;
    margin: 0;
    overflow-x: hidden;
    color: var(--ink);
    background:
        radial-gradient(circle at 16% 4%, rgba(76, 98, 197, 0.2), transparent 25rem),
        radial-gradient(circle at 86% 17%, rgba(32, 151, 145, 0.14), transparent 28rem),
        linear-gradient(180deg, #081322 0%, var(--page) 45%, #050c16 100%);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: "";
    pointer-events: none;
    background-image:
        linear-gradient(rgba(139, 160, 191, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(139, 160, 191, 0.035) 1px, transparent 1px);
    background-size: 58px 58px;
    mask-image: linear-gradient(to bottom, black 0%, transparent 72%);
}

a {
    color: inherit;
}

button,
input {
    font: inherit;
}

:focus-visible {
    outline: 3px solid var(--concept);
    outline-offset: 3px;
}

.shell {
    width: min(calc(100% - 40px), var(--content));
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    padding: 10px 14px;
    border-radius: 10px;
    color: #09101c;
    background: var(--concept);
    font-size: 0.85rem;
    font-weight: 800;
    text-decoration: none;
    transform: translateY(-160%);
    transition: transform 180ms ease;
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--line);
    background: rgba(5, 12, 22, 0.78);
    backdrop-filter: blur(20px) saturate(1.35);
}

.topbar {
    min-height: 72px;
    display: flex;
    align-items: center;
    gap: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    text-decoration: none;
    white-space: nowrap;
}

.brand-mark {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(142, 162, 255, 0.34);
    border-radius: 13px;
    color: #ffffff;
    background: linear-gradient(145deg, #5169d5, #263d9b);
    box-shadow: 0 10px 28px rgba(70, 92, 203, 0.28);
    font-size: 0.76rem;
    font-weight: 850;
    letter-spacing: -0.03em;
}

.brand-copy {
    display: grid;
    line-height: 1.1;
}

.brand-copy strong {
    font-size: 0.95rem;
    letter-spacing: -0.02em;
}

.brand-copy span {
    margin-top: 5px;
    color: var(--muted);
    font-size: 0.69rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.topbar-links {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-left: auto;
}

.topbar-links a {
    padding: 9px 12px;
    border-radius: 11px;
    color: var(--muted);
    font-size: 0.84rem;
    font-weight: 720;
    text-decoration: none;
    transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

.topbar-links a:hover {
    color: var(--ink);
    background: var(--surface-2);
}

.topbar-links .home-link {
    margin-left: 8px;
    border: 1px solid var(--line-strong);
    color: var(--ink);
    background: rgba(255, 255, 255, 0.035);
}

.intro {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: clamp(48px, 8vw, 110px);
    padding-block: clamp(78px, 10vw, 138px) clamp(76px, 9vw, 116px);
}

.intro-copy {
    max-width: 850px;
}

.eyebrow,
.section-label {
    margin: 0 0 17px;
    color: var(--pre);
    font-size: 0.75rem;
    font-weight: 850;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.eyebrow span {
    position: relative;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--post);
    box-shadow: 0 0 0 5px rgba(85, 216, 199, 0.12), 0 0 28px rgba(85, 216, 199, 0.72);
}

.intro h1 {
    max-width: 940px;
    margin: 0;
    font-size: clamp(3.4rem, 8vw, 7.5rem);
    font-weight: 820;
    letter-spacing: -0.078em;
    line-height: 0.9;
}

.intro h1 em {
    display: block;
    color: transparent;
    background: linear-gradient(100deg, var(--pre) 8%, #c1a8ff 46%, var(--post) 96%);
    background-clip: text;
    -webkit-background-clip: text;
    font-style: normal;
}

.intro-lede {
    max-width: 720px;
    margin: 30px 0 0;
    color: var(--muted);
    font-size: clamp(1.05rem, 1.7vw, 1.23rem);
}

.intro-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 30px;
}

.primary-action,
.secondary-action {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 18px;
    border-radius: 13px;
    font-size: 0.9rem;
    font-weight: 800;
    text-decoration: none;
    transition: transform 160ms ease, box-shadow 160ms ease;
}

.primary-action {
    color: #08111e;
    background: var(--concept);
    box-shadow: 0 12px 34px rgba(255, 201, 111, 0.2);
}

.secondary-action {
    border: 1px solid var(--line-strong);
    background: rgba(255, 255, 255, 0.035);
}

.primary-action:hover,
.secondary-action:hover {
    transform: translateY(-2px);
}

.intro-stats {
    display: grid;
    gap: 10px;
    width: 190px;
}

.intro-stats div {
    display: grid;
    grid-template-columns: 70px 1fr;
    align-items: baseline;
    gap: 8px;
    padding: 13px 15px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(13, 26, 43, 0.74);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.intro-stats strong {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 1.45rem;
    letter-spacing: -0.05em;
}

.intro-stats span {
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.tree-section {
    position: relative;
    padding-block: 40px 120px;
    scroll-margin-top: 92px;
}

.tree-section::before {
    position: absolute;
    inset: 170px 0 auto;
    z-index: -1;
    height: 850px;
    content: "";
    background: radial-gradient(ellipse at center, rgba(70, 91, 170, 0.13), transparent 67%);
}

.tree-heading,
.index-heading {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(260px, 430px);
    align-items: end;
    gap: 50px;
    margin-bottom: 30px;
}

.tree-heading h2,
.index-heading h2 {
    max-width: 780px;
    margin: 0;
    font-size: clamp(2.15rem, 4.7vw, 4rem);
    line-height: 1.02;
    letter-spacing: -0.057em;
}

.tree-heading > p,
.index-heading > p {
    margin: 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.tree-shell {
    position: relative;
}

.tree-stage {
    position: relative;
    isolation: isolate;
    width: 100%;
    height: min(79vh, 880px);
    min-height: 650px;
    overflow: hidden;
    border: 1px solid var(--line-strong);
    border-radius: 32px;
    background:
        radial-gradient(circle at 50% 44%, rgba(54, 77, 132, 0.2), transparent 38%),
        radial-gradient(circle at 22% 12%, rgba(142, 162, 255, 0.07), transparent 24%),
        linear-gradient(180deg, rgba(10, 21, 37, 0.95), rgba(5, 12, 22, 0.98));
    box-shadow: var(--shadow), inset 0 0 100px rgba(0, 0, 0, 0.25);
    touch-action: none;
}

.tree-stage::before {
    position: absolute;
    inset: 0;
    z-index: 0;
    content: "";
    pointer-events: none;
    background-image: radial-gradient(rgba(201, 220, 247, 0.55) 0.7px, transparent 0.8px);
    background-size: 31px 31px;
    opacity: 0.16;
    mask-image: radial-gradient(circle at center, black, transparent 78%);
}

.tree-webgl-layer,
.tree-css-layer {
    position: absolute !important;
    inset: 0;
    width: 100%;
    height: 100%;
}

.tree-webgl-layer {
    z-index: 1;
    pointer-events: none;
}

.tree-css-layer {
    z-index: 2;
    pointer-events: none;
}

.tree-node {
    border: 0;
    color: var(--ink);
    font: inherit;
    -webkit-font-smoothing: antialiased;
    user-select: none;
}

.hierarchy-node {
    width: 230px;
    min-height: 82px;
    display: grid;
    place-items: center;
    padding: 13px 18px;
    border: 1px solid rgba(151, 174, 207, 0.32);
    border-radius: 18px;
    background: rgba(13, 26, 43, 0.94);
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.32), inset 0 1px rgba(255, 255, 255, 0.06);
    text-align: center;
    cursor: pointer;
    pointer-events: auto;
    transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease, opacity 180ms ease;
}

.hierarchy-node:hover {
    border-color: var(--concept);
    box-shadow: 0 20px 52px rgba(0, 0, 0, 0.38), 0 0 32px rgba(255, 201, 111, 0.1);
}

.hierarchy-node small {
    display: block;
    margin-bottom: 5px;
    color: var(--muted);
    font-size: 0.62rem;
    font-weight: 850;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hierarchy-node strong {
    display: block;
    font-size: 0.92rem;
    line-height: 1.22;
    letter-spacing: -0.025em;
}

.root-node {
    width: 270px;
    min-height: 104px;
    border-color: rgba(255, 201, 111, 0.5);
    background: linear-gradient(145deg, rgba(71, 53, 27, 0.97), rgba(24, 31, 43, 0.98));
    box-shadow: 0 22px 58px rgba(0, 0, 0, 0.4), 0 0 44px rgba(255, 201, 111, 0.1);
}

.root-node small {
    color: var(--concept);
}

.root-node strong {
    font-size: 1.1rem;
}

.phase-node[data-tree-phase="pre"] {
    border-color: rgba(142, 162, 255, 0.52);
    background: linear-gradient(145deg, rgba(47, 61, 115, 0.96), rgba(14, 27, 46, 0.97));
}

.phase-node[data-tree-phase="post"] {
    border-color: rgba(85, 216, 199, 0.5);
    background: linear-gradient(145deg, rgba(27, 83, 82, 0.95), rgba(14, 27, 46, 0.97));
}

.phase-node[data-tree-phase="pre"] small,
.module-node[data-tree-phase="pre"] small {
    color: var(--pre);
}

.phase-node[data-tree-phase="post"] small,
.module-node[data-tree-phase="post"] small {
    color: var(--post);
}

.module-node {
    width: 220px;
    min-height: 90px;
}

.module-node.is-active[data-tree-phase="pre"] {
    border-color: var(--pre);
    background: rgba(41, 53, 99, 0.98);
    box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 38px rgba(142, 162, 255, 0.22);
}

.module-node.is-active[data-tree-phase="post"] {
    border-color: var(--post);
    background: rgba(24, 72, 72, 0.98);
    box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 38px rgba(85, 216, 199, 0.2);
}

.tree-node.is-filtered {
    opacity: 0.08;
    pointer-events: none;
}

.concept-node {
    position: relative;
    width: 250px;
    height: 196px;
    overflow: hidden;
    border: 1px solid rgba(255, 201, 111, 0.33);
    border-radius: 17px;
    background: rgba(9, 18, 31, 0.97);
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.42), inset 0 1px rgba(255, 255, 255, 0.05);
    pointer-events: auto;
    transition: border-color 180ms ease, box-shadow 180ms ease, opacity 220ms ease;
}

.concept-node:hover,
.concept-node.is-focused {
    border-color: var(--concept);
    box-shadow: 0 22px 54px rgba(0, 0, 0, 0.48), 0 0 34px rgba(255, 201, 111, 0.17);
}

.preview-viewport {
    position: relative;
    width: 250px;
    height: 136px;
    overflow: hidden;
    border-bottom: 1px solid var(--line);
    background:
        radial-gradient(circle at 72% 30%, rgba(142, 162, 255, 0.18), transparent 45%),
        linear-gradient(145deg, #13233a, #091321);
}

.preview-viewport iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 500px;
    height: 272px;
    border: 0;
    background: #ffffff;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.5);
    transform-origin: 0 0;
    transition: opacity 260ms ease;
}

.concept-node.is-preview-live iframe {
    opacity: 0.86;
}

.preview-placeholder {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background:
        linear-gradient(135deg, transparent 46%, rgba(255, 255, 255, 0.025) 47%, rgba(255, 255, 255, 0.025) 53%, transparent 54%),
        radial-gradient(circle at center, rgba(255, 201, 111, 0.1), transparent 62%);
    background-size: 28px 28px, auto;
    transition: opacity 220ms ease;
}

.preview-placeholder span {
    padding: 6px 9px;
    border: 1px solid rgba(255, 201, 111, 0.28);
    border-radius: 999px;
    color: var(--concept);
    background: rgba(8, 17, 30, 0.82);
    font-size: 0.56rem;
    font-weight: 850;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.concept-node.is-preview-live .preview-placeholder {
    opacity: 0;
}

.concept-footer {
    height: 60px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px;
    padding: 9px 10px 9px 13px;
}

.concept-focus {
    min-width: 0;
    padding: 0;
    border: 0;
    color: var(--ink);
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.concept-focus small {
    display: block;
    margin-bottom: 2px;
    color: var(--concept);
    font-size: 0.5rem;
    font-weight: 850;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.concept-focus strong {
    display: block;
    overflow: hidden;
    font-size: 0.74rem;
    line-height: 1.22;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.concept-open {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    color: var(--concept);
    background: rgba(255, 255, 255, 0.035);
    font-size: 0.8rem;
    font-weight: 850;
    text-decoration: none;
}

.concept-open:hover {
    border-color: var(--concept);
    background: var(--concept-soft);
}

.tree-loading,
.tree-fallback {
    position: absolute;
    inset: 0;
    z-index: 20;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 14px;
    color: var(--muted);
    background: rgba(5, 12, 22, 0.78);
    font-size: 0.84rem;
    font-weight: 720;
    backdrop-filter: blur(10px);
    transition: opacity 260ms ease, visibility 260ms ease;
}

.tree-loading.is-hidden {
    visibility: hidden;
    opacity: 0;
}

.tree-loading.is-hidden .loading-orbit {
    animation: none;
}

.loading-orbit {
    width: 52px;
    height: 52px;
    border: 1px solid rgba(142, 162, 255, 0.23);
    border-top-color: var(--pre);
    border-right-color: var(--post);
    border-radius: 50%;
    animation: spin 900ms linear infinite;
}

@keyframes spin {
    to { transform: rotate(1turn); }
}

.tree-fallback[hidden] {
    display: none;
}

.tree-fallback strong {
    color: var(--ink);
    font-size: 1.1rem;
}

.tree-fallback a {
    color: var(--concept);
    font-weight: 800;
}

.tree-corner {
    position: absolute;
    z-index: 5;
    width: 34px;
    height: 34px;
    pointer-events: none;
}

.tree-corner--top {
    top: 20px;
    left: 20px;
    border-top: 1px solid rgba(255, 201, 111, 0.45);
    border-left: 1px solid rgba(255, 201, 111, 0.45);
}

.tree-corner--bottom {
    right: 20px;
    bottom: 20px;
    border-right: 1px solid rgba(85, 216, 199, 0.4);
    border-bottom: 1px solid rgba(85, 216, 199, 0.4);
}

.tree-guide {
    position: absolute;
    top: 25px;
    right: 27px;
    z-index: 8;
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 9px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--muted);
    background: rgba(5, 12, 22, 0.7);
    font-size: 0.62rem;
    font-weight: 750;
    backdrop-filter: blur(10px);
    pointer-events: none;
}

.guide-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.guide-dot--pre { background: var(--pre); }
.guide-dot--post { background: var(--post); }
.guide-dot--concept { background: var(--concept); }

.selection-card {
    position: absolute;
    top: 24px;
    left: 24px;
    z-index: 8;
    width: min(310px, calc(100% - 48px));
    padding: 15px 17px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(5, 12, 22, 0.78);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(13px);
    pointer-events: auto;
}

.selection-kicker {
    display: block;
    margin-bottom: 5px;
    color: var(--concept);
    font-size: 0.59rem;
    font-weight: 850;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.selection-card strong {
    display: block;
    font-size: 0.88rem;
    letter-spacing: -0.02em;
}

.selection-card p {
    margin: 5px 0 8px;
    color: var(--muted);
    font-size: 0.7rem;
    line-height: 1.45;
}

.selection-card a {
    color: var(--pre);
    font-size: 0.68rem;
    font-weight: 800;
    text-decoration: none;
}

.selection-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

#selection-syntax-link {
    color: var(--concept);
}

#selection-syntax-link[hidden] {
    display: none;
}

.tree-toolbar {
    position: absolute;
    left: 50%;
    bottom: 22px;
    z-index: 9;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 7px;
    border: 1px solid var(--line-strong);
    border-radius: 15px;
    background: rgba(5, 12, 22, 0.82);
    box-shadow: 0 16px 38px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(14px);
    transform: translateX(-50%);
}

.tree-toolbar button {
    min-height: 35px;
    padding: 7px 10px;
    border: 0;
    border-radius: 9px;
    color: var(--muted);
    background: transparent;
    font-size: 0.68rem;
    font-weight: 800;
    cursor: pointer;
    white-space: nowrap;
}

.tree-toolbar button:hover,
.tree-toolbar button.is-active,
.tree-toolbar button[aria-pressed="true"] {
    color: var(--ink);
    background: var(--surface-3);
}

.toolbar-separator {
    width: 1px;
    height: 22px;
    margin-inline: 4px;
    background: var(--line-strong);
}

.tree-help {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 15px 0 0;
    color: var(--muted);
    font-size: 0.7rem;
    text-align: center;
}

.tree-help span {
    color: var(--ink);
    font-weight: 800;
}

.index-section {
    padding-block: 50px 130px;
    scroll-margin-top: 95px;
}

.index-tools {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) auto auto;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.search-field {
    min-height: 52px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 16px;
    border: 1px solid var(--line-strong);
    border-radius: 15px;
    background: rgba(13, 26, 43, 0.86);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.search-field span {
    color: var(--concept);
    font-size: 1.3rem;
}

.search-field input {
    width: 100%;
    border: 0;
    outline: 0;
    color: var(--ink);
    background: transparent;
    font-size: 0.9rem;
}

.search-field input::placeholder {
    color: #6e829d;
}

.index-filters {
    display: flex;
    gap: 5px;
    padding: 6px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(13, 26, 43, 0.72);
}

.index-filter {
    min-height: 38px;
    padding: 7px 10px;
    border: 0;
    border-radius: 9px;
    color: var(--muted);
    background: transparent;
    font-size: 0.68rem;
    font-weight: 800;
    cursor: pointer;
}

.index-filter:hover,
.index-filter.is-active {
    color: var(--ink);
    background: var(--surface-3);
}

.result-count {
    min-width: 86px;
    margin: 0;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 750;
    text-align: right;
}

.concept-index {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.index-module {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(13, 26, 43, 0.78);
    box-shadow: 0 16px 42px rgba(0, 0, 0, 0.14);
}

.index-module[hidden] {
    display: none;
}

.index-module-header {
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr) auto;
    align-items: center;
    gap: 13px;
    padding: 18px;
    border-bottom: 1px solid var(--line);
}

.index-module[data-phase="pre"] .index-module-header {
    background: linear-gradient(110deg, var(--pre-soft), transparent 72%);
}

.index-module[data-phase="post"] .index-module-header {
    background: linear-gradient(110deg, var(--post-soft), transparent 72%);
}

.index-module-number {
    width: 43px;
    height: 43px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line-strong);
    border-radius: 13px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.76rem;
    font-weight: 850;
}

.index-module[data-phase="pre"] .index-module-number {
    border-color: rgba(142, 162, 255, 0.4);
    color: var(--pre);
    background: var(--pre-soft);
}

.index-module[data-phase="post"] .index-module-number {
    border-color: rgba(85, 216, 199, 0.4);
    color: var(--post);
    background: var(--post-soft);
}

.index-module-header h3 {
    margin: 0;
    font-size: 0.96rem;
    line-height: 1.24;
    letter-spacing: -0.025em;
}

.index-module-header p {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 0.68rem;
}

.locate-module {
    padding: 7px 9px;
    border: 1px solid var(--line);
    border-radius: 9px;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.025);
    font-size: 0.64rem;
    font-weight: 800;
    cursor: pointer;
}

.locate-module:hover {
    border-color: var(--concept);
    color: var(--concept);
}

.index-concepts {
    margin: 0;
    padding: 7px 18px 13px;
    list-style: none;
}

.index-concept {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto auto;
    align-items: center;
    gap: 8px;
    min-height: 47px;
    border-bottom: 1px solid rgba(151, 174, 207, 0.1);
}

.index-concept:last-child {
    border-bottom: 0;
}

.index-concept[hidden] {
    display: none;
}

.concept-name {
    min-width: 0;
    color: var(--muted);
    font-size: 0.77rem;
}

.concept-reference {
    display: block;
    margin-top: 3px;
    color: var(--pre);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.58rem;
    font-weight: 800;
    letter-spacing: 0.035em;
}

.locate-concept,
.open-concept,
.syntax-concept {
    padding: 5px 7px;
    border: 0;
    border-radius: 8px;
    color: var(--muted);
    background: transparent;
    font-size: 0.61rem;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
}

.locate-concept:hover {
    color: var(--concept);
    background: var(--concept-soft);
}

.open-concept:hover {
    color: var(--pre);
    background: var(--pre-soft);
}

.syntax-concept:hover {
    color: var(--concept);
    background: var(--concept-soft);
}

.empty-results {
    grid-column: 1 / -1;
    padding: 50px 24px;
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius);
    color: var(--muted);
    text-align: center;
}

.noscript-index {
    margin-top: 20px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
}

.noscript-index a {
    color: var(--pre);
}

.footer {
    padding: 30px 0 46px;
    border-top: 1px solid var(--line);
    background: rgba(4, 10, 19, 0.64);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.footer p {
    margin: 0;
    color: var(--muted);
    font-size: 0.74rem;
}

.footer-inner > div {
    display: flex;
    gap: 18px;
}

.footer a {
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 750;
    text-decoration: none;
}

.footer a:hover {
    color: var(--ink);
}

@media (max-width: 980px) {
    .intro {
        grid-template-columns: 1fr;
    }

    .intro-stats {
        width: 100%;
        grid-template-columns: repeat(3, 1fr);
    }

    .intro-stats div {
        grid-template-columns: auto 1fr;
    }

    .tree-heading,
    .index-heading {
        grid-template-columns: 1fr;
        align-items: start;
        gap: 15px;
    }

    .index-tools {
        grid-template-columns: 1fr auto;
    }

    .search-field {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    .shell {
        width: min(calc(100% - 26px), var(--content));
    }

    .topbar-links > a:not(.home-link) {
        display: none;
    }

    .intro {
        padding-top: 68px;
    }

    .intro h1 {
        font-size: clamp(3.2rem, 17vw, 5.5rem);
    }

    .intro-stats {
        grid-template-columns: 1fr;
    }

    .intro-stats div {
        grid-template-columns: 65px 1fr;
    }

    .tree-stage {
        height: 72vh;
        min-height: 580px;
        border-radius: 24px;
    }

    .tree-guide {
        display: none;
    }

    .selection-card {
        top: 15px;
        left: 15px;
        width: calc(100% - 30px);
    }

    .selection-card p {
        display: none;
    }

    .tree-toolbar {
        right: 12px;
        bottom: 12px;
        left: 12px;
        justify-content: center;
        overflow-x: auto;
        transform: none;
    }

    .tree-toolbar button {
        font-size: 0.62rem;
    }

    .tree-help {
        display: block;
        line-height: 1.8;
    }

    .concept-index {
        grid-template-columns: 1fr;
    }

    .index-tools {
        grid-template-columns: 1fr;
    }

    .index-filters {
        overflow-x: auto;
    }

    .index-filter {
        white-space: nowrap;
    }

    .result-count {
        text-align: left;
    }

    .footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .brand-copy span {
        display: none;
    }

    .topbar-links .home-link {
        margin-left: 0;
        padding-inline: 9px;
    }

    .index-module-header {
        grid-template-columns: 42px minmax(0, 1fr);
    }

    .locate-module {
        grid-column: 1 / -1;
    }

    .index-concept {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .locate-concept {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Lightweight two-dimensional speedrun map */
.tree-stage.tree-stage--2d {
    height: auto;
    min-height: 540px;
    overflow: hidden;
    padding: 22px;
    touch-action: auto;
}

.tree-stage--2d::before {
    opacity: 0.1;
}

.map-topbar {
    position: relative;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 24px;
}

.selection-card.selection-card--2d {
    position: static;
    width: min(520px, 100%);
    min-height: 104px;
}

.selection-card--2d p {
    margin-bottom: 5px;
}

.tree-toolbar.tree-toolbar--2d {
    position: static;
    flex: 0 0 auto;
    transform: none;
}

.graph-zoom-controls {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px;
    border: 1px solid var(--line);
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.025);
}

.tree-toolbar .graph-zoom-controls button {
    min-width: 32px;
    padding-inline: 8px;
    font-size: 0.76rem;
}

.tree-toolbar .graph-zoom-controls button:first-child {
    min-width: 42px;
    font-size: 0.62rem;
}

.tree-toolbar .graph-zoom-controls button:disabled {
    opacity: 0.36;
    cursor: not-allowed;
}

.graph-zoom-controls input[type="range"] {
    width: 76px;
    margin: 0 3px;
    accent-color: var(--concept);
    cursor: ew-resize;
}

.graph-zoom-controls output {
    width: 35px;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.55rem;
    font-weight: 800;
    text-align: center;
}

.tree-map {
    position: relative;
    z-index: 3;
}

.map-root {
    position: relative;
    width: min(360px, 100%);
    display: grid;
    justify-items: center;
    margin: 10px auto 52px;
    padding: 19px 24px;
    border: 1px solid rgba(255, 201, 111, 0.5);
    border-radius: 18px;
    background: linear-gradient(145deg, rgba(68, 52, 29, 0.96), rgba(17, 28, 43, 0.97));
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3), 0 0 36px rgba(255, 201, 111, 0.08);
    text-align: center;
}

.map-root::after {
    position: absolute;
    bottom: -53px;
    left: 50%;
    width: 1px;
    height: 52px;
    content: "";
    background: linear-gradient(var(--concept), var(--line-strong));
}

.map-root span {
    color: var(--concept);
    font-size: 0.62rem;
    font-weight: 850;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.map-root strong {
    margin-top: 2px;
    font-size: 1.15rem;
    letter-spacing: -0.035em;
}

.map-root small {
    margin-top: 4px;
    color: var(--muted);
    font-size: 0.66rem;
}

.map-phases {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.map-phase {
    min-width: 0;
}

.map-phase[hidden] {
    display: none;
}

.map-phase-header {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 3px 15px;
    padding: 17px 19px;
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    background: rgba(13, 26, 43, 0.92);
}

.map-phase[data-map-phase="pre"] .map-phase-header {
    border-color: rgba(142, 162, 255, 0.42);
    background: linear-gradient(110deg, rgba(55, 69, 128, 0.78), rgba(13, 26, 43, 0.92));
}

.map-phase[data-map-phase="post"] .map-phase-header {
    border-color: rgba(85, 216, 199, 0.4);
    background: linear-gradient(110deg, rgba(28, 86, 83, 0.72), rgba(13, 26, 43, 0.92));
}

.map-phase-header span {
    grid-column: 1 / -1;
    color: var(--muted);
    font-size: 0.58rem;
    font-weight: 850;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.map-phase[data-map-phase="pre"] .map-phase-header span { color: var(--pre); }
.map-phase[data-map-phase="post"] .map-phase-header span { color: var(--post); }

.map-phase-header h3 {
    margin: 0;
    font-size: 1rem;
    letter-spacing: -0.025em;
}

.map-phase-header small {
    color: var(--muted);
    font-size: 0.65rem;
}

.map-modules {
    position: relative;
    display: grid;
    gap: 10px;
    margin-left: 18px;
    padding: 18px 0 0 21px;
    border-left: 1px solid var(--line-strong);
}

.map-module {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 15px;
    background: rgba(10, 21, 36, 0.9);
    transition: border-color 160ms ease, background 160ms ease;
}

.map-module::before {
    position: absolute;
    top: 31px;
    left: -22px;
    width: 21px;
    height: 1px;
    content: "";
    background: var(--line-strong);
}

.map-module.is-open[data-phase="pre"] {
    border-color: rgba(142, 162, 255, 0.52);
}

.map-module.is-open[data-phase="post"] {
    border-color: rgba(85, 216, 199, 0.5);
}

.map-module-trigger {
    width: 100%;
    min-height: 68px;
    display: grid;
    grid-template-columns: 43px minmax(0, 1fr) 30px;
    align-items: center;
    gap: 12px;
    padding: 11px 13px;
    border: 0;
    color: var(--ink);
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.map-module-trigger:hover {
    background: rgba(255, 255, 255, 0.03);
}

.map-module-number {
    width: 41px;
    height: 41px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    color: var(--pre);
    background: var(--pre-soft);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.72rem;
    font-weight: 850;
}

.map-module[data-phase="post"] .map-module-number {
    color: var(--post);
    background: var(--post-soft);
}

.map-module-title {
    min-width: 0;
}

.map-module-title small {
    display: block;
    margin-bottom: 2px;
    color: var(--muted);
    font-size: 0.57rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.map-module-title strong {
    display: block;
    font-size: 0.82rem;
    line-height: 1.25;
}

.map-module-toggle {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 9px;
    color: var(--muted);
    font-size: 0.95rem;
}

.map-module-body {
    padding: 0 13px 14px;
    border-top: 1px solid var(--line);
}

.map-module-body[hidden] {
    display: none;
}

.map-module-description {
    margin: 0;
    padding: 13px 2px;
    color: var(--muted);
    font-size: 0.7rem;
}

.map-concepts {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.map-concept {
    min-width: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: rgba(6, 14, 25, 0.86);
    transition: border-color 170ms ease, box-shadow 170ms ease;
}

.map-concept:hover,
.map-concept.is-focused {
    border-color: var(--concept);
    box-shadow: 0 0 24px rgba(255, 201, 111, 0.12);
}

.map-concept.is-application {
    border-color: rgba(85, 216, 199, 0.27);
}

.map-preview {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 8.6;
    overflow: hidden;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(145deg, #14253e, #091421);
}

.map-preview iframe {
    position: absolute;
    inset: 0 auto auto 0;
    width: 200%;
    height: 200%;
    border: 0;
    background: #ffffff;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.5);
    transform-origin: 0 0;
    transition: opacity 200ms ease;
}

.map-concept.is-preview-live iframe {
    opacity: 0.84;
}

.map-preview-placeholder {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at center, rgba(142, 162, 255, 0.13), transparent 68%);
    transition: opacity 180ms ease;
}

.map-concept.is-application .map-preview-placeholder {
    background: radial-gradient(circle at center, rgba(85, 216, 199, 0.13), transparent 68%);
}

.map-preview-placeholder span {
    padding: 5px 8px;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    color: var(--muted);
    background: rgba(5, 12, 22, 0.8);
    font-size: 0.5rem;
    font-weight: 850;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.map-concept.is-application .map-preview-placeholder span {
    color: var(--post);
}

.map-concept.is-preview-live .map-preview-placeholder {
    opacity: 0;
}

.map-concept-footer {
    min-height: 55px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: center;
    gap: 6px;
    padding: 8px 8px 8px 10px;
}

.map-concept-footer button {
    min-width: 0;
    padding: 0;
    border: 0;
    color: var(--ink);
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.map-concept-footer button small {
    display: block;
    color: var(--concept);
    font-size: 0.48rem;
    font-weight: 850;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.map-concept.is-application .map-concept-footer button small {
    color: var(--post);
}

.map-concept-footer button strong {
    display: block;
    overflow: hidden;
    font-size: 0.67rem;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.map-concept-footer > a {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--pre);
    text-decoration: none;
}

.studied-mark {
    display: none;
    color: var(--post);
    font-size: 0.7rem;
    font-weight: 900;
}

.map-concept.is-studied .studied-mark {
    display: inline;
}

.index-concept.is-application .concept-name b {
    margin-right: 7px;
    padding: 3px 5px;
    border-radius: 6px;
    color: var(--post);
    background: var(--post-soft);
    font-size: 0.48rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.index-concept.is-studied .concept-name::after {
    margin-left: 7px;
    color: var(--post);
    content: "✓";
    font-weight: 900;
}

@media (max-width: 1050px) {
    .map-phases {
        grid-template-columns: 1fr;
    }

    .map-concepts {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 820px) {
    .map-topbar {
        align-items: stretch;
        flex-direction: column;
    }

    .selection-card.selection-card--2d {
        width: 100%;
    }

    .tree-toolbar.tree-toolbar--2d {
        width: 100%;
        justify-content: center;
    }

    .map-concepts {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .tree-stage.tree-stage--2d {
        min-height: 500px;
        padding: 13px;
        border-radius: 20px;
    }

    .selection-card--2d p {
        display: block;
    }

    .tree-toolbar.tree-toolbar--2d {
        flex-wrap: wrap;
    }

    .toolbar-separator {
        display: none;
    }

    .map-root {
        margin-bottom: 38px;
    }

    .map-root::after {
        bottom: -39px;
        height: 38px;
    }

    .map-modules {
        margin-left: 8px;
        padding-left: 13px;
    }

    .map-module::before {
        left: -14px;
        width: 13px;
    }

    .map-module-trigger {
        grid-template-columns: 39px minmax(0, 1fr) 28px;
        gap: 9px;
        padding-inline: 10px;
    }

    .map-module-number {
        width: 37px;
        height: 37px;
    }

    .map-concepts {
        grid-template-columns: 1fr;
    }

    .map-preview {
        aspect-ratio: 16 / 7.5;
    }
}

/* True prerequisite graph: static Canvas edges + accessible HTML nodes */
.selection-card.selection-card--2d {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 180px;
    grid-template-rows: auto auto auto auto;
    gap: 2px 14px;
    width: min(650px, 100%);
}

.selection-preview {
    position: relative;
    grid-column: 2;
    grid-row: 1 / 5;
    width: 180px;
    aspect-ratio: 16 / 9;
    align-self: center;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: linear-gradient(145deg, #14253e, #091421);
}

.selection-preview iframe {
    position: absolute;
    inset: 0 auto auto 0;
    width: 360px;
    height: 202px;
    border: 0;
    background: #ffffff;
    pointer-events: none;
    transform: scale(0.5);
    transform-origin: 0 0;
}

.module-filter-label {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    margin-left: 4px;
    padding-left: 8px;
    border-left: 1px solid var(--line-strong);
    color: var(--muted);
    font-size: 0.62rem;
    font-weight: 800;
}

.module-filter-label select {
    min-height: 35px;
    max-width: 170px;
    padding: 6px 28px 6px 9px;
    border: 1px solid var(--line);
    border-radius: 9px;
    color: var(--ink);
    background: var(--surface-2);
    font: inherit;
    font-size: 0.65rem;
}

.dependency-viewport {
    position: relative;
    z-index: 3;
    width: 100%;
    height: min(76vh, 860px);
    min-height: 620px;
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: 20px;
    background:
        linear-gradient(rgba(139, 160, 191, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(139, 160, 191, 0.035) 1px, transparent 1px),
        rgba(4, 11, 20, 0.78);
    background-size: 36px 36px;
    scrollbar-color: var(--surface-3) transparent;
    scrollbar-width: thin;
    touch-action: pan-x pan-y;
    -webkit-overflow-scrolling: touch;
}

.dependency-surface {
    position: relative;
    min-width: 100%;
    min-height: 100%;
}

.dependency-content {
    position: absolute;
    transform-origin: 0 0;
}

#dependency-edges,
.dependency-nodes {
    position: absolute;
    inset: 0;
}

#dependency-edges {
    z-index: 1;
    pointer-events: none;
}

.dependency-nodes {
    z-index: 2;
    pointer-events: none;
}

.dependency-node {
    position: absolute;
    width: 220px;
    min-height: 76px;
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr) auto;
    align-items: center;
    gap: 9px;
    padding: 10px;
    border: 1px solid rgba(142, 162, 255, 0.31);
    border-radius: 13px;
    color: var(--ink);
    background: rgba(13, 26, 43, 0.96);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
    text-align: left;
    cursor: pointer;
    pointer-events: auto;
    transition: border-color 150ms ease, box-shadow 150ms ease, opacity 150ms ease, transform 150ms ease;
}

.dependency-node[data-phase="post"] {
    border-color: rgba(85, 216, 199, 0.3);
}

.dependency-node.is-on-path {
    border-color: rgba(255, 201, 111, 0.55);
    box-shadow: 0 0 0 1px rgba(255, 201, 111, 0.28), 0 12px 28px rgba(0, 0, 0, 0.25);
}

.dependency-node:hover,
.dependency-node.is-selected {
    z-index: 5;
    border-color: var(--concept);
    box-shadow: 0 15px 34px rgba(0, 0, 0, 0.34), 0 0 28px rgba(255, 201, 111, 0.14);
    transform: translateY(-2px);
}

.dependency-node.is-application {
    border-style: dashed;
    border-color: rgba(85, 216, 199, 0.52);
    background: rgba(16, 48, 49, 0.96);
}

.dependency-node.is-context {
    opacity: 0.48;
}

.dependency-node.is-search-dimmed {
    opacity: 0.15;
}

.dependency-node.is-search-match {
    border-color: var(--concept);
    box-shadow: 0 0 30px rgba(255, 201, 111, 0.18);
}

.dependency-node-number {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    color: var(--pre);
    background: var(--pre-soft);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.62rem;
    font-weight: 850;
}

.dependency-node[data-phase="post"] .dependency-node-number {
    color: var(--post);
    background: var(--post-soft);
}

.dependency-node.is-application .dependency-node-number {
    color: var(--concept);
    background: var(--concept-soft);
}

.dependency-node-copy {
    min-width: 0;
}

.dependency-node-copy small {
    display: block;
    margin-bottom: 2px;
    color: var(--muted);
    font-size: 0.48rem;
    font-weight: 850;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.dependency-node-copy strong {
    display: -webkit-box;
    overflow: hidden;
    font-size: 0.67rem;
    line-height: 1.23;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.dependency-count {
    align-self: start;
    padding: 3px 5px;
    border-radius: 6px;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.04);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.48rem;
    font-weight: 800;
}

.dependency-node.is-studied::after {
    position: absolute;
    right: 8px;
    bottom: 6px;
    color: var(--post);
    content: "✓";
    font-size: 0.62rem;
    font-weight: 900;
}

.dependency-viewport.is-graph-overview .dependency-node {
    border-width: calc(1px * var(--inverse-graph-zoom, 1));
    border-radius: calc(4px * var(--inverse-graph-zoom, 1));
    box-shadow: none;
}

.dependency-viewport.is-graph-overview .dependency-node-copy,
.dependency-viewport.is-graph-overview .dependency-node-number,
.dependency-viewport.is-graph-overview .dependency-count,
.dependency-viewport.is-graph-overview .dependency-node.is-studied::after {
    visibility: hidden;
}

.dependency-viewport.is-graph-overview .dependency-node:hover,
.dependency-viewport.is-graph-overview .dependency-node.is-selected {
    box-shadow: 0 0 0 calc(2px * var(--inverse-graph-zoom, 1)) rgba(255, 201, 111, 0.72);
    transform: none;
}

.graph-empty {
    position: absolute;
    inset: 0;
    z-index: 3;
    display: grid;
    place-content: center;
    color: var(--muted);
    font-size: 0.78rem;
    text-align: center;
}

@media (max-width: 900px) {
    .map-topbar {
        align-items: stretch;
        flex-direction: column;
    }

    .selection-card.selection-card--2d {
        width: 100%;
    }

    .tree-toolbar.tree-toolbar--2d {
        width: 100%;
        flex-wrap: wrap;
        justify-content: flex-start;
    }
}

@media (max-width: 620px) {
    .selection-card.selection-card--2d {
        grid-template-columns: 1fr;
    }

    .selection-preview {
        grid-column: 1;
        grid-row: auto;
        width: 100%;
        max-width: 300px;
        margin-top: 8px;
    }

    .selection-preview iframe {
        width: 200%;
        height: 200%;
    }

    .module-filter-label {
        width: 100%;
        margin: 3px 0 0;
        padding: 7px 0 0;
        border-top: 1px solid var(--line-strong);
        border-left: 0;
    }

    .module-filter-label select {
        max-width: none;
        flex: 1;
    }

    .graph-zoom-controls {
        order: 5;
        width: 100%;
        justify-content: center;
    }

    .graph-zoom-controls input[type="range"] {
        width: min(34vw, 128px);
    }

    .dependency-viewport {
        height: 70vh;
        min-height: 520px;
        border-radius: 15px;
    }
}