/* ==========================================================================
   ViewGraph developer site — design system
   A self-contained design system for the /view-graph section. Opt in with
   <body class="vg">.

   The site uses a single primary accent — the ViewGraph app icon's pink/red —
   on a deep charcoal/navy foundation with neutral surfaces, borders and text.
   The multi-color graph palette lives only inside real product screenshots.
   A light theme is provided too.
   ========================================================================== */

:root {
    color-scheme: dark;

    /* Website UI accent — one primary pink/red sampled from the ViewGraph
       app icon. Every interactive or highlighted UI element uses this single
       hue; neutral surfaces, borders and text carry everything else. The
       product's own graph colors appear only inside real screenshots. */
    --vg-accent: #FF5FAE;
    --vg-accent-hover: #FF86C3;
    --vg-accent-press: #F0499E;
    --vg-accent-soft: rgba(253, 79, 166, 0.16);

    /* Surfaces */
    --vg-bg: #080B14;
    --vg-bg-2: #0C1120;
    --vg-surface: #101627;
    --vg-surface-2: #151C30;
    --vg-header-bg: rgba(8, 11, 20, 0.74);
    --vg-footer-bg: rgba(255, 255, 255, 0.02);
    --vg-code-bg: rgba(255, 255, 255, 0.06);

    --vg-border: rgba(255, 255, 255, 0.09);
    --vg-border-strong: rgba(255, 255, 255, 0.20);
    --vg-divider: rgba(255, 255, 255, 0.12);
    --vg-grid-line: rgba(255, 255, 255, 0.045);

    --vg-glow-accent: rgba(253, 79, 166, 0.16);

    /* Text */
    --vg-text: #ECF0FA;
    --vg-text-secondary: #9AA4BE;
    --vg-text-tertiary: #6E7893;

    /* Primary CTA — solid vivid fill with a high-contrast dark foreground.
       Verified: #18040F on the pink gradient stays >= 6:1 contrast. */
    --vg-btn-primary-text: #18040F;
    --vg-btn-primary-bg: linear-gradient(135deg, #FF7DBE 0%, #FF3F97 58%, #F54FA0 100%);
    --vg-btn-primary-bg-hover: linear-gradient(135deg, #FF93CA 0%, #FF54A4 58%, #FF67AD 100%);
    --vg-btn-primary-shadow: 0 8px 24px rgba(255, 63, 151, 0.30), inset 0 1px 0 rgba(255, 255, 255, 0.35);

    --vg-focus: #FF86C3;

    --vg-radius: 16px;
    --vg-radius-sm: 11px;
    --vg-radius-lg: 22px;
    --vg-shadow: 0 18px 46px rgba(0, 0, 0, 0.45);
    --vg-shadow-sm: 0 3px 14px rgba(0, 0, 0, 0.35);
    --vg-content-width: 760px;
    --vg-wide-width: 1080px;

    --vg-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --vg-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: light) {
    :root {
        color-scheme: light;

        --vg-accent: #CE2A79;
        --vg-accent-hover: #B01F66;
        --vg-accent-press: #97194F;
        --vg-accent-soft: rgba(206, 42, 121, 0.10);

        --vg-bg: #F5F7FC;
        --vg-bg-2: #FFFFFF;
        --vg-surface: #FFFFFF;
        --vg-surface-2: #F1F4FB;
        --vg-header-bg: rgba(255, 255, 255, 0.80);
        --vg-footer-bg: rgba(15, 23, 42, 0.03);
        --vg-code-bg: rgba(15, 23, 42, 0.05);

        --vg-border: rgba(15, 23, 42, 0.10);
        --vg-border-strong: rgba(15, 23, 42, 0.22);
        --vg-divider: rgba(15, 23, 42, 0.12);
        --vg-grid-line: rgba(15, 23, 42, 0.045);

        --vg-glow-accent: rgba(206, 42, 121, 0.09);

        --vg-text: #0F1524;
        --vg-text-secondary: #4E586F;
        --vg-text-tertiary: #79839A;

        --vg-btn-primary-text: #1B0411;
        --vg-btn-primary-shadow: 0 8px 22px rgba(255, 63, 151, 0.26), inset 0 1px 0 rgba(255, 255, 255, 0.4);

        --vg-focus: #CE2A79;

        --vg-shadow: 0 18px 46px rgba(15, 23, 42, 0.12);
        --vg-shadow-sm: 0 3px 14px rgba(15, 23, 42, 0.08);
    }
}

/* Base ------------------------------------------------------------------- */

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

html {
    scroll-behavior: smooth;
}

body.vg {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: var(--vg-font);
    font-size: 17px;
    line-height: 1.65;
    color: var(--vg-text);
    background-color: var(--vg-bg);
    background-image:
        radial-gradient(900px 520px at 84% -14%, var(--vg-glow-accent), transparent 62%),
        linear-gradient(180deg, var(--vg-bg-2) 0%, var(--vg-bg) 640px);
    background-repeat: no-repeat;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

body.vg img {
    max-width: 100%;
    height: auto;
}

body.vg a {
    color: var(--vg-accent);
    text-decoration: none;
    transition: color 0.18s ease;
}

body.vg a:hover {
    color: var(--vg-accent-hover);
    text-decoration: underline;
    text-underline-offset: 3px;
}

body.vg :focus-visible {
    outline: 2px solid var(--vg-focus);
    outline-offset: 3px;
    border-radius: 8px;
}

::selection {
    background: var(--vg-accent-soft);
    color: var(--vg-text);
}

/* Skip link -------------------------------------------------------------- */

.vg-skip {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 200;
    padding: 10px 16px;
    background: var(--vg-text);
    color: var(--vg-bg);
    font-size: 14px;
    font-weight: 650;
    border-radius: 0 0 10px 0;
}

.vg-skip:focus {
    left: 0;
}

/* Header ----------------------------------------------------------------- */

.vg-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--vg-header-bg);
    -webkit-backdrop-filter: blur(20px) saturate(1.7);
    backdrop-filter: blur(20px) saturate(1.7);
    border-bottom: 1px solid var(--vg-divider);
}

.vg-header-inner {
    max-width: var(--vg-wide-width);
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

body.vg a.vg-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--vg-text);
    font-size: 16px;
    font-weight: 680;
    letter-spacing: -0.01em;
    white-space: nowrap;
}

body.vg a.vg-brand:hover {
    color: var(--vg-text);
    text-decoration: none;
}

.vg-brand img {
    width: 27px;
    height: 27px;
    border-radius: 8px;
    display: block;
}

.vg-version {
    margin-left: 2px;
    padding: 2px 8px;
    border-radius: 999px;
    border: 1px solid var(--vg-border-strong);
    font-size: 11px;
    font-weight: 680;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--vg-text-secondary);
}

.vg-nav {
    display: flex;
    align-items: center;
    gap: 22px;
}

body.vg .vg-nav a {
    font-size: 14px;
    font-weight: 560;
    color: var(--vg-text-secondary);
}

body.vg .vg-nav a:hover {
    color: var(--vg-text);
    text-decoration: none;
}

body.vg .vg-nav a[aria-current="page"] {
    color: var(--vg-text);
}

body.vg .vg-nav a.vg-nav-cta {
    padding: 8px 15px;
    border-radius: 10px;
    color: var(--vg-btn-primary-text);
    background: var(--vg-btn-primary-bg);
    font-weight: 680;
    box-shadow: 0 4px 14px rgba(255, 63, 151, 0.26);
}

body.vg .vg-nav a.vg-nav-cta:hover,
body.vg .vg-nav a.vg-nav-cta:focus-visible {
    color: var(--vg-btn-primary-text);
    background: var(--vg-btn-primary-bg-hover);
    text-decoration: none;
}

/* Layout ----------------------------------------------------------------- */

.vg-main {
    display: block;
}

.vg-container {
    max-width: var(--vg-wide-width);
    margin: 0 auto;
    padding: 0 24px;
}

.vg-prose-container {
    max-width: var(--vg-content-width);
    margin: 0 auto;
    padding: 0 24px;
}

.vg-section {
    padding: 72px 0;
}

.vg-section + .vg-section {
    padding-top: 0;
}

.vg-section-head {
    max-width: 700px;
    margin: 0 0 34px;
}

.vg-eyebrow {
    display: inline-block;
    margin: 0 0 16px;
    font-size: 12.5px;
    font-weight: 680;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--vg-text-tertiary);
}

.vg-section-head h2 {
    margin: 0 0 10px;
    font-size: clamp(24px, 3vw, 31px);
    font-weight: 720;
    letter-spacing: -0.02em;
    line-height: 1.18;
}

.vg-section-head p {
    margin: 0;
    color: var(--vg-text-secondary);
    font-size: 17px;
}

/* Hero ------------------------------------------------------------------- */

.vg-hero {
    position: relative;
    padding: 78px 0 56px;
    isolation: isolate;
}

.vg-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -2;
    background-image:
        linear-gradient(var(--vg-grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--vg-grid-line) 1px, transparent 1px);
    background-size: 38px 38px;
    -webkit-mask-image: radial-gradient(120% 78% at 50% -4%, #000 0%, transparent 70%);
    mask-image: radial-gradient(120% 78% at 50% -4%, #000 0%, transparent 70%);
    pointer-events: none;
}

.vg-hero-graph {
    position: absolute;
    top: 30px;
    right: max(0px, calc((100% - var(--vg-wide-width)) / 2 - 30px));
    width: 420px;
    height: 340px;
    z-index: -1;
    opacity: 0.55;
    pointer-events: none;
}

/* Decorative hero graph uses the single UI accent plus neutral edges. It is
   an abstraction, not a claim about the product's own graph colors. */
.vg-hero-graph .vg-graph-nodes { stroke: var(--vg-accent); }
.vg-hero-graph .vg-graph-edges { stroke: var(--vg-text-tertiary); }

.vg-hero h1 {
    margin: 0 0 22px;
    max-width: 900px;
    font-size: clamp(36px, 5.4vw, 58px);
    font-weight: 780;
    letter-spacing: -0.036em;
    line-height: 1.05;
    text-wrap: balance;
}

.vg-hero .vg-lede {
    margin: 0 0 16px;
    max-width: 760px;
    font-size: clamp(18px, 2vw, 21px);
    line-height: 1.52;
    color: var(--vg-text-secondary);
}

.vg-hero-note {
    margin: 0 0 30px;
    max-width: 720px;
    font-size: 15px;
    color: var(--vg-text-tertiary);
}

/* Inline brand emphasis */
.vg-em-accent { color: var(--vg-accent); font-weight: 620; }

/* Buttons ---------------------------------------------------------------- */

body.vg a.vg-btn,
body.vg button.vg-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 13px 22px;
    border-radius: 12px;
    font-family: inherit;
    font-size: 15.5px;
    font-weight: 640;
    line-height: 1.15;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, transform 0.12s ease;
}

.vg-btn svg {
    flex: none;
}

/* Primary CTA.
   Scoped under body.vg and with :visited/:hover/:active so the generic
   `body.vg a` and `body.vg a:hover` rules can never override the foreground
   text (this was the invisible "Download" bug). */
body.vg a.vg-btn-primary,
body.vg a.vg-btn-primary:visited,
body.vg button.vg-btn-primary {
    color: var(--vg-btn-primary-text);
    background: var(--vg-btn-primary-bg);
    border-color: transparent;
    box-shadow: var(--vg-btn-primary-shadow);
}

body.vg a.vg-btn-primary:hover,
body.vg a.vg-btn-primary:focus-visible,
body.vg button.vg-btn-primary:hover,
body.vg button.vg-btn-primary:focus-visible {
    color: var(--vg-btn-primary-text);
    background: var(--vg-btn-primary-bg-hover);
    text-decoration: none;
}

body.vg a.vg-btn-primary:active,
body.vg button.vg-btn-primary:active {
    color: var(--vg-btn-primary-text);
    background: var(--vg-accent-press);
    transform: translateY(1px);
    box-shadow: 0 4px 14px rgba(255, 63, 151, 0.30);
}

body.vg a.vg-btn-primary:focus-visible,
body.vg button.vg-btn-primary:focus-visible,
body.vg a.vg-btn-secondary:focus-visible,
body.vg button.vg-btn-secondary:focus-visible {
    outline: 3px solid var(--vg-focus);
    outline-offset: 3px;
}

/* Secondary CTA */
body.vg a.vg-btn-secondary,
body.vg a.vg-btn-secondary:visited,
body.vg button.vg-btn-secondary {
    color: var(--vg-text);
    background: var(--vg-surface);
    border-color: var(--vg-border-strong);
}

body.vg a.vg-btn-secondary:hover,
body.vg a.vg-btn-secondary:focus-visible {
    color: var(--vg-text);
    background: var(--vg-surface-2);
    border-color: var(--vg-accent);
    text-decoration: none;
}

/* Tertiary CTA */
body.vg a.vg-btn-ghost,
body.vg a.vg-btn-ghost:visited {
    color: var(--vg-text-secondary);
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    padding-inline: 8px;
}

body.vg a.vg-btn-ghost:hover,
body.vg a.vg-btn-ghost:focus-visible {
    color: var(--vg-text);
    text-decoration: none;
}

body.vg a.vg-btn-ghost .vg-btn-arrow {
    transition: transform 0.18s ease;
}

body.vg a.vg-btn-ghost:hover .vg-btn-arrow {
    transform: translateX(3px);
}

.vg-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

/* Product screenshot ----------------------------------------------------- */

.vg-hero .vg-hero-shot {
    margin: 84px 0 0;
}

.vg-shot {
    margin: 0;
}

/* macOS-style window frame */
.vg-window {
    border: 1px solid var(--vg-border);
    border-radius: 14px;
    overflow: hidden;
    background: var(--vg-surface);
    box-shadow: var(--vg-shadow), 0 0 0 1px rgba(255, 255, 255, 0.02) inset;
}

.vg-window-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 15px;
    background: var(--vg-surface-2);
    border-bottom: 1px solid var(--vg-border);
}

.vg-window-dots {
    display: flex;
    gap: 7px;
    flex: none;
}

.vg-window-dots span {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    display: block;
}

.vg-window-dots span:nth-child(1) { background: #FF5F57; }
.vg-window-dots span:nth-child(2) { background: #FEBC2E; }
.vg-window-dots span:nth-child(3) { background: #28C840; }

.vg-window-title {
    font-size: 12.5px;
    font-weight: 560;
    color: var(--vg-text-tertiary);
    margin: 0 auto;
    padding-right: 46px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.vg-window img {
    display: block;
    width: 100%;
    height: auto;
}

/* Legacy frame (used by a few article figures) */

.vg-shot img {
    display: block;
    width: 100%;
    height: auto;
}

.vg-shot figcaption {
    margin-top: 12px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--vg-text-secondary);
}

/* Annotated callouts beneath the hero capture */
.vg-shot-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin-top: 16px;
}

.vg-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-size: 14px;
    font-weight: 560;
    color: var(--vg-text-secondary);
}

.vg-legend-item::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex: none;
    background: var(--vg-text-tertiary);
}

/* Problem section -------------------------------------------------------- */

.vg-problem-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.vg-problem {
    padding: 24px;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius);
    background: var(--vg-surface);
}

.vg-problem .vg-problem-num {
    display: inline-block;
    margin-bottom: 14px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--vg-text-tertiary);
}

.vg-problem h3 {
    margin: 0 0 8px;
    font-size: 17.5px;
    font-weight: 680;
    letter-spacing: -0.01em;
}

.vg-problem p {
    margin: 0;
    font-size: 15.5px;
    color: var(--vg-text-secondary);
}

/* What ViewGraph maps ---------------------------------------------------- */

.vg-map-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.vg-map-card {
    position: relative;
    padding: 26px 24px 24px;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius);
    background: var(--vg-surface);
    overflow: hidden;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.vg-map-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: linear-gradient(90deg, var(--vg-accent), transparent 92%);
    opacity: 0.9;
}

.vg-map-card:hover {
    transform: translateY(-2px);
    border-color: var(--vg-border-strong);
    box-shadow: var(--vg-shadow-sm);
}

.vg-map-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 16px;
    border-radius: 12px;
    color: var(--vg-accent);
    background: var(--vg-accent-soft);
    border: 1px solid var(--vg-border);
}

.vg-map-card h3 {
    margin: 0 0 8px;
    font-size: 18px;
    font-weight: 680;
    letter-spacing: -0.01em;
}

.vg-map-card p {
    margin: 0;
    font-size: 15.5px;
    color: var(--vg-text-secondary);
}

.vg-map-card .vg-map-kicker {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--vg-text-tertiary);
}

/* Tags + badges ---------------------------------------------------------- */

.vg-badge {
    display: inline-block;
    padding: 4px 11px;
    border-radius: 999px;
    font-size: 12.5px;
    font-weight: 680;
    letter-spacing: 0.01em;
    background: var(--vg-accent-soft);
    color: var(--vg-accent);
}

/* Category badges share the single accent — the label carries the meaning. */

/* Use cases -------------------------------------------------------------- */

.vg-usecase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.vg-usecase {
    display: block;
    padding: 22px;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius);
    background: var(--vg-surface);
    color: var(--vg-text);
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

body.vg a.vg-usecase {
    color: var(--vg-text);
}

body.vg a.vg-usecase:hover {
    color: var(--vg-text);
    text-decoration: none;
    transform: translateY(-2px);
    border-color: var(--vg-accent);
    box-shadow: var(--vg-shadow-sm);
}

.vg-usecase .vg-usecase-icon {
    display: inline-flex;
    color: var(--vg-text-secondary);
    margin-bottom: 12px;
    transition: color 0.18s ease;
}

body.vg a.vg-usecase:hover .vg-usecase-icon {
    color: var(--vg-accent);
}

.vg-usecase h3 {
    margin: 0 0 6px;
    font-size: 16.5px;
    font-weight: 680;
    letter-spacing: -0.01em;
}

.vg-usecase p {
    margin: 0;
    font-size: 15px;
    color: var(--vg-text-secondary);
}

.vg-usecase .vg-usecase-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    font-size: 13.5px;
    font-weight: 640;
    color: var(--vg-accent);
}

.vg-usecase-more svg {
    transition: transform 0.18s ease;
}

body.vg a.vg-usecase:hover .vg-usecase-more svg {
    transform: translateX(3px);
}

/* How it fits beside Xcode ----------------------------------------------- */

.vg-fit {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.vg-fit-node {
    position: relative;
    padding: 22px;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius);
    background: var(--vg-surface);
}

.vg-fit-node .vg-fit-role {
    display: block;
    margin-bottom: 10px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--vg-text-tertiary);
}

.vg-fit-node h3 {
    margin: 0 0 6px;
    font-size: 17px;
    font-weight: 680;
    letter-spacing: -0.01em;
}

.vg-fit-node p {
    margin: 0;
    font-size: 14.5px;
    color: var(--vg-text-secondary);
}

/* ViewGraph is the emphasised middle card; Xcode and the AI assistant stay
   neutral. */
.vg-fit-node.vg-fit-viewgraph {
    border-color: var(--vg-accent);
    background: linear-gradient(180deg, var(--vg-accent-soft), var(--vg-surface));
    box-shadow: var(--vg-shadow-sm);
}

.vg-fit-node.vg-fit-viewgraph .vg-fit-role {
    color: var(--vg-accent);
}

.vg-fit-caption {
    margin: 0;
    max-width: 760px;
    font-size: 16px;
    color: var(--vg-text-secondary);
}

/* Blog index ------------------------------------------------------------- */

.vg-page-head {
    padding: 64px 0 28px;
    border-bottom: 1px solid var(--vg-divider);
    margin-bottom: 40px;
}

.vg-page-head h1 {
    margin: 0 0 14px;
    font-size: clamp(32px, 4.4vw, 44px);
    font-weight: 760;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.vg-page-head p {
    margin: 0;
    max-width: 680px;
    font-size: 18px;
    color: var(--vg-text-secondary);
}

.vg-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0 0 34px;
}

.vg-filter {
    padding: 8px 15px;
    border-radius: 999px;
    border: 1px solid var(--vg-border);
    background: var(--vg-surface);
    color: var(--vg-text-secondary);
    font: inherit;
    font-size: 14px;
    font-weight: 620;
    cursor: pointer;
    transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.vg-filter:hover {
    border-color: var(--vg-border-strong);
    color: var(--vg-text);
}

.vg-filter[aria-pressed="true"] {
    background: var(--vg-text);
    border-color: var(--vg-text);
    color: var(--vg-bg);
}

.vg-category-group + .vg-category-group {
    margin-top: 46px;
}

/* Author display rules would otherwise override the [hidden] attribute. */
.vg-post-card[hidden],
.vg-category-group[hidden] {
    display: none !important;
}

.vg-category-group h2 {
    margin: 0 0 6px;
    font-size: 22px;
    font-weight: 720;
    letter-spacing: -0.015em;
}

.vg-category-group > p {
    margin: 0 0 22px;
    color: var(--vg-text-secondary);
    font-size: 16px;
}

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

.vg-post-card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius);
    background: var(--vg-surface);
    overflow: hidden;
    box-shadow: var(--vg-shadow-sm);
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.vg-post-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--vg-shadow);
    border-color: var(--vg-border-strong);
}

body.vg .vg-post-card a.vg-post-link {
    display: flex;
    flex-direction: column;
    height: 100%;
    color: inherit;
}

body.vg .vg-post-card a.vg-post-link:hover {
    text-decoration: none;
    color: inherit;
}

.vg-post-card .vg-post-thumb {
    border-bottom: 1px solid var(--vg-border);
    background: var(--vg-bg-2);
}

.vg-post-card .vg-post-thumb img {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    object-position: top center;
}

.vg-post-body {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 20px 22px 22px;
    flex: 1;
}

.vg-post-body h3 {
    margin: 0;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.28;
}

.vg-post-body p {
    margin: 0;
    font-size: 15.5px;
    color: var(--vg-text-secondary);
    flex: 1;
}

.vg-post-meta {
    font-size: 13.5px;
    color: var(--vg-text-tertiary);
}

/* Article ---------------------------------------------------------------- */

.vg-article-head {
    padding: 56px 0 26px;
    border-bottom: 1px solid var(--vg-divider);
}

.vg-article-head h1 {
    margin: 16px 0 16px;
    font-size: clamp(30px, 4.2vw, 42px);
    font-weight: 760;
    letter-spacing: -0.03em;
    line-height: 1.12;
    text-wrap: balance;
}

.vg-article-lede {
    margin: 0 0 18px;
    font-size: 19px;
    line-height: 1.55;
    color: var(--vg-text-secondary);
}

.vg-article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    font-size: 14px;
    color: var(--vg-text-tertiary);
}

.vg-article-layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding: 40px 0 8px;
}

.vg-toc {
    position: sticky;
    top: 78px;
    align-self: start;
    font-size: 14px;
    line-height: 1.5;
}

.vg-toc h2 {
    margin: 0 0 10px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--vg-text-tertiary);
}

.vg-toc ol {
    margin: 0;
    padding: 0 0 0 18px;
    color: var(--vg-text-secondary);
}

.vg-toc li {
    margin-bottom: 7px;
}

body.vg .vg-toc a {
    color: var(--vg-text-secondary);
}

body.vg .vg-toc a:hover {
    color: var(--vg-accent);
}

.vg-article-body {
    min-width: 0;
}

/* Prose ------------------------------------------------------------------ */

.vg-prose {
    font-size: 17.5px;
    line-height: 1.72;
}

.vg-prose > * + * {
    margin-top: 20px;
}

.vg-prose h2 {
    margin-top: 46px;
    margin-bottom: 0;
    font-size: 26px;
    font-weight: 720;
    letter-spacing: -0.02em;
    line-height: 1.25;
    scroll-margin-top: 84px;
}

.vg-prose h3 {
    margin-top: 32px;
    margin-bottom: 0;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.3;
    scroll-margin-top: 84px;
}

.vg-prose p {
    margin-bottom: 0;
}

.vg-prose ul,
.vg-prose ol {
    margin: 20px 0 0;
    padding-left: 26px;
}

.vg-prose li + li {
    margin-top: 8px;
}

.vg-prose a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.vg-prose strong {
    font-weight: 700;
}

.vg-prose blockquote {
    margin: 24px 0 0;
    padding: 4px 0 4px 20px;
    border-left: 3px solid var(--vg-accent);
    color: var(--vg-text-secondary);
    font-style: normal;
}

.vg-prose code {
    padding: 2px 6px;
    border-radius: 6px;
    background: var(--vg-code-bg);
    font-family: var(--vg-mono);
    font-size: 0.9em;
}

.vg-prose pre {
    margin: 24px 0 0;
    padding: 18px 20px;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius-sm);
    background: var(--vg-code-bg);
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.6;
}

.vg-prose pre code {
    padding: 0;
    background: none;
    font-size: inherit;
}

.vg-prose .vg-shot {
    margin-top: 28px;
}

.vg-prose hr {
    margin: 40px 0 0;
    border: 0;
    border-top: 1px solid var(--vg-divider);
}

.vg-callout {
    margin-top: 26px;
    padding: 18px 20px;
    border: 1px solid var(--vg-border);
    border-left: 3px solid var(--vg-accent);
    border-radius: var(--vg-radius-sm);
    background: var(--vg-accent-soft);
    font-size: 16px;
    line-height: 1.6;
}

.vg-callout strong {
    display: block;
    margin-bottom: 4px;
}

/* Related + CTA ---------------------------------------------------------- */

.vg-related {
    margin-top: 52px;
    padding-top: 34px;
    border-top: 1px solid var(--vg-divider);
}

.vg-related h2 {
    margin: 0 0 20px;
    font-size: 20px;
    font-weight: 720;
    letter-spacing: -0.015em;
}

.vg-related-list {
    display: grid;
    gap: 16px;
}

body.vg a.vg-related-item {
    display: block;
    padding: 18px 20px;
    border: 1px solid var(--vg-border);
    border-radius: var(--vg-radius-sm);
    background: var(--vg-surface);
    color: var(--vg-text);
}

body.vg a.vg-related-item:hover {
    border-color: var(--vg-accent);
    text-decoration: none;
    color: var(--vg-text);
}

.vg-related-item strong {
    display: block;
    margin-bottom: 4px;
    font-size: 16.5px;
    font-weight: 680;
}

.vg-related-item span {
    font-size: 14.5px;
    color: var(--vg-text-secondary);
}

/* CTA block */
.vg-cta {
    position: relative;
    margin: 48px 0 0;
    padding: 34px;
    border-radius: var(--vg-radius-lg);
    border: 1px solid var(--vg-border);
    background:
        radial-gradient(680px 240px at 12% -30%, var(--vg-glow-accent), transparent 60%),
        var(--vg-surface);
    box-shadow: var(--vg-shadow-sm);
    overflow: hidden;
}

.vg-cta::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--vg-grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--vg-grid-line) 1px, transparent 1px);
    background-size: 34px 34px;
    -webkit-mask-image: radial-gradient(100% 100% at 100% 0%, #000, transparent 70%);
    mask-image: radial-gradient(100% 100% at 100% 0%, #000, transparent 70%);
    pointer-events: none;
}

.vg-cta > * {
    position: relative;
}

.vg-cta h2 {
    margin: 0 0 8px;
    font-size: 22px;
    font-weight: 720;
    letter-spacing: -0.015em;
}

.vg-cta p {
    margin: 0 0 18px;
    color: var(--vg-text-secondary);
    font-size: 16px;
    max-width: 620px;
}

.vg-back {
    display: inline-block;
    margin-bottom: 8px;
    font-size: 14.5px;
    font-weight: 620;
}

/* Footer ----------------------------------------------------------------- */

.vg-footer {
    margin-top: 72px;
    border-top: 1px solid var(--vg-divider);
    background: var(--vg-footer-bg);
}

.vg-footer-inner {
    max-width: var(--vg-wide-width);
    margin: 0 auto;
    padding: 46px 24px;
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 32px;
}

body.vg a.vg-footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 680;
    color: var(--vg-text);
}

body.vg a.vg-footer-brand:hover {
    color: var(--vg-text);
    text-decoration: none;
}

.vg-footer-brand img {
    width: 26px;
    height: 26px;
    border-radius: 8px;
}

.vg-footer p {
    margin: 10px 0 0;
    max-width: 340px;
    font-size: 14px;
    color: var(--vg-text-secondary);
}

.vg-footer h2 {
    margin: 0 0 12px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--vg-text-tertiary);
}

.vg-footer nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.vg-footer nav li + li {
    margin-top: 8px;
}

body.vg .vg-footer nav a {
    font-size: 14.5px;
    color: var(--vg-text-secondary);
}

body.vg .vg-footer nav a:hover {
    color: var(--vg-text);
}

.vg-footer-copy {
    grid-column: 1 / -1;
    margin: 8px 0 0;
    padding-top: 22px;
    border-top: 1px solid var(--vg-divider);
    font-size: 13px;
    color: var(--vg-text-tertiary);
}

/* Responsive ------------------------------------------------------------- */

@media (max-width: 960px) {
    .vg-map-grid,
    .vg-problem-grid,
    .vg-fit {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .vg-hero-graph {
        display: none;
    }
}

@media (max-width: 900px) {
    .vg-article-layout {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .vg-toc {
        position: static;
        padding: 18px 20px;
        border: 1px solid var(--vg-border);
        border-radius: var(--vg-radius-sm);
        background: var(--vg-surface);
    }

    .vg-toc h2 {
        margin-bottom: 8px;
    }
}

@media (max-width: 720px) {
    body.vg {
        font-size: 16px;
    }

    .vg-header-inner {
        padding: 10px 16px;
        flex-wrap: wrap;
        gap: 8px 12px;
    }

    .vg-version {
        display: none;
    }

    .vg-nav {
        flex-wrap: wrap;
        gap: 8px 16px;
        row-gap: 8px;
    }

    body.vg .vg-nav a {
        font-size: 13.5px;
    }

    body.vg .vg-nav a.vg-nav-cta {
        padding: 6px 12px;
    }

    .vg-container,
    .vg-prose-container {
        padding: 0 18px;
    }

    .vg-hero {
        padding: 52px 0 40px;
    }

    .vg-section {
        padding: 48px 0;
    }

    .vg-map-grid,
    .vg-problem-grid,
    .vg-fit,
    .vg-post-grid {
        grid-template-columns: 1fr;
    }

    .vg-page-head {
        padding-top: 48px;
    }

    .vg-article-head {
        padding-top: 40px;
    }

    .vg-article-layout {
        padding-top: 28px;
    }

    .vg-prose {
        font-size: 17px;
    }

    .vg-cta {
        padding: 26px 20px;
    }

    .vg-footer-inner {
        grid-template-columns: 1fr;
        gap: 26px;
        padding: 36px 18px;
    }
}

/* Reduced motion --------------------------------------------------------- */

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

    body.vg *,
    body.vg *::before,
    body.vg *::after {
        transition: none !important;
        animation: none !important;
    }
}