/* ==========================================================================
   AutoCoreAI — Blog stylesheet
   1. Tokens · 2. Base · 3. Layout · 4. Article · 5. Interactive modules
   6. Blog index · 7. Motion
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------- */
:root {
  --c-bg: #fbfbfd;
  --c-surface: #ffffff;
  --c-surface-alt: #f5f5f7;
  --c-border: #e6e6eb;
  --c-border-strong: #d2d2d7;
  --c-text: #1d1d1f;
  --c-text-2: #515154;
  --c-text-3: #6e6e73;
  --c-accent: #0066cc;
  --c-accent-hover: #0055aa;
  --c-accent-soft: #eef5ff;
  --c-accent-line: #b8d4f5;
  --c-ai: #5b4bdb;
  --c-ai-soft: #f1efff;
  --c-ok: #0a7a46;
  --c-ok-soft: #e8f6ee;
  --c-warn: #8a5a00;
  --c-warn-soft: #fff7e6;
  --c-warn-line: #f2d39b;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --s-1: .25rem; --s-2: .5rem; --s-3: .75rem; --s-4: 1rem; --s-5: 1.5rem;
  --s-6: 2rem; --s-7: 3rem; --s-8: 4rem; --s-9: 6rem;

  --r-sm: 8px; --r-md: 14px; --r-lg: 20px; --r-pill: 999px;
  --shadow-1: 0 1px 2px rgba(16,24,40,.04), 0 1px 1px rgba(16,24,40,.03);
  --shadow-2: 0 1px 2px rgba(16,24,40,.04), 0 8px 24px -6px rgba(16,24,40,.08);
  --shadow-3: 0 2px 4px rgba(16,24,40,.04), 0 24px 48px -12px rgba(16,24,40,.14);

  --measure: 42rem;
  --wide: 72rem;
  --gutter: var(--s-5);
  --ease: cubic-bezier(.2,.7,.2,1);
  --dur: 240ms;
}
@media (max-width: 40rem) { :root { --gutter: var(--s-4); } }

/* 2. Base ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { background: var(--c-bg); color: var(--c-text); font: 1.0625rem/1.7 var(--font-sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--c-accent); text-underline-offset: .2em; }
a:hover { color: var(--c-accent-hover); }
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--c-accent-soft); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip:focus { position: fixed; top: var(--s-3); left: var(--s-3); z-index: 50; width: auto; height: auto; clip: auto; padding: var(--s-2) var(--s-4); background: var(--c-surface); border-radius: var(--r-sm); box-shadow: var(--shadow-2); }
[hidden] { display: none !important; }

/* 3. Layout ---------------------------------------------------------------- */
.progress { position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 30; background: linear-gradient(90deg, var(--c-accent), var(--c-ai)); transform-origin: 0 50%; transform: scaleX(var(--p, 0)); }
.disclosure { background: var(--c-surface); border-bottom: 1px solid var(--c-border); font-size: .8125rem; color: var(--c-text-2); text-align: center; padding: var(--s-2) var(--gutter); }
.disclosure strong { color: var(--c-text); }
.header { position: sticky; top: 0; z-index: 20; background: rgba(251,251,253,.82); backdrop-filter: saturate(180%) blur(18px); -webkit-backdrop-filter: saturate(180%) blur(18px); border-bottom: 1px solid var(--c-border); }
.header__inner { max-width: var(--wide); margin: 0 auto; padding: 0 var(--gutter); height: 3.5rem; display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); }
.logo { display: inline-flex; align-items: center; gap: var(--s-2); font-weight: 700; letter-spacing: -.02em; color: var(--c-text); text-decoration: none; }
.logo__mark { width: 22px; height: 22px; border-radius: 6px; background: var(--c-text); display: grid; place-items: center; }
.logo__mark::after { content: ""; width: 8px; height: 8px; border-radius: 2px; background: #fff; transform: rotate(45deg); }
.nav { display: flex; gap: var(--s-5); font-size: .875rem; }
.nav a { color: var(--c-text-2); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--c-text); }
@media (max-width: 48rem) { .nav { display: none; } }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2); min-height: 2.75rem; padding: 0 var(--s-5); border-radius: var(--r-pill); font: 600 .9375rem/1 var(--font-sans); text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease); white-space: nowrap; }
.btn:active { transform: scale(.98); }
.btn--primary { background: var(--c-accent); color: #fff; }
.btn--primary:hover { background: var(--c-accent-hover); color: #fff; box-shadow: 0 6px 20px -6px rgba(0,102,204,.45); }
.btn--secondary { background: var(--c-surface); color: var(--c-text); border-color: var(--c-border-strong); }
.btn--secondary:hover { color: var(--c-text); border-color: var(--c-text-3); }
.btn--sm { min-height: 2.25rem; padding: 0 var(--s-4); font-size: .875rem; }
.footer { border-top: 1px solid var(--c-border); padding: var(--s-6) var(--gutter); font-size: .75rem; color: var(--c-text-3); text-align: center; }
.footer a { color: var(--c-text-3); }

/* 4. Article --------------------------------------------------------------- */
.article-head { position: relative; overflow: hidden; isolation: isolate; border-bottom: 1px solid var(--c-border); }
.article-head::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(var(--c-border) 1px, transparent 1px), linear-gradient(90deg, var(--c-border) 1px, transparent 1px); background-size: 40px 40px; mask-image: radial-gradient(ellipse 70% 80% at 50% 0%, #000 10%, transparent 70%); -webkit-mask-image: radial-gradient(ellipse 70% 80% at 50% 0%, #000 10%, transparent 70%); opacity: .55; }
.article-head::after { content: ""; position: absolute; z-index: -1; width: 48rem; height: 30rem; left: 50%; top: -18rem; transform: translateX(-50%); background: radial-gradient(closest-side, var(--tone, rgba(0,102,204,.12)), transparent); }
.article-head__inner { max-width: calc(var(--measure) + 2 * var(--gutter)); margin: 0 auto; padding: var(--s-7) var(--gutter) var(--s-6); }
.crumbs ol { display: flex; flex-wrap: wrap; gap: var(--s-2); list-style: none; padding: 0; font-size: .75rem; color: var(--c-text-3); }
.crumbs li + li::before { content: "/"; margin-right: var(--s-2); color: var(--c-border-strong); }
.crumbs a { color: var(--c-text-3); text-decoration: none; }
.kicker { display: inline-flex; align-items: center; gap: var(--s-2); margin-top: var(--s-5); font: 600 .75rem/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--c-accent); }
.kicker::after { content: ""; width: 28px; height: 1px; background: var(--c-accent-line); }
.article-head h1 { margin-top: var(--s-3); font-size: clamp(2rem, 1.3rem + 2.8vw, 3.25rem); line-height: 1.06; letter-spacing: -.035em; text-wrap: balance; }
.dek { margin-top: var(--s-4); font-size: 1.1875rem; color: var(--c-text-2); text-wrap: pretty; }
.byline { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2) var(--s-4); margin-top: var(--s-5); font-size: .875rem; color: var(--c-text-3); }
.byline__author { display: flex; align-items: center; gap: var(--s-3); color: var(--c-text); }
.avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--c-surface-alt); border: 1px solid var(--c-border); display: grid; place-items: center; font-weight: 700; font-size: .75rem; color: var(--c-text-2); }
.byline__author span { line-height: 1.3; }
.byline__author small { display: block; color: var(--c-text-3); }

.article-layout { max-width: var(--wide); margin: 0 auto; padding: var(--s-6) var(--gutter) var(--s-8); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, var(--measure)) minmax(0, 1fr); gap: var(--s-6); }
.article-body { grid-column: 2; min-width: 0; }
.toc { grid-column: 3; position: sticky; top: 5rem; align-self: start; font-size: .8125rem; max-width: 15rem; }
.toc p { font: 600 .6875rem/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--c-text-3); margin-bottom: var(--s-3); }
.toc ol { list-style: none; padding: 0; border-left: 1px solid var(--c-border); }
.toc a { display: block; padding: var(--s-1) 0 var(--s-1) var(--s-3); margin-left: -1px; border-left: 2px solid transparent; color: var(--c-text-3); text-decoration: none; line-height: 1.4; transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.toc a:hover { color: var(--c-text); }
.toc a.is-active { color: var(--c-text); border-left-color: var(--c-accent); }
@media (max-width: 68rem) { .article-layout { grid-template-columns: minmax(0, 1fr); max-width: calc(var(--measure) + 2 * var(--gutter)); } .article-body { grid-column: 1; } .toc { display: none; } }

.tldr { padding: var(--s-5); border: 1px solid var(--c-accent-line); background: var(--c-accent-soft); border-radius: var(--r-md); }
.tldr strong { display: block; font: 600 .75rem/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--c-accent); margin-bottom: var(--s-3); }
.tldr ul { padding-left: 1.1em; }
.tldr li + li { margin-top: var(--s-2); }

.prose > * + * { margin-top: var(--s-4); }
.prose h2 { margin-top: var(--s-8); font-size: 1.75rem; line-height: 1.2; letter-spacing: -.025em; scroll-margin-top: 5rem; text-wrap: balance; }
.prose h3 { margin-top: var(--s-6); font-size: 1.1875rem; letter-spacing: -.015em; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li + li { margin-top: var(--s-2); }
.prose .answer { font-size: 1.125rem; padding-left: var(--s-4); border-left: 2px solid var(--c-accent); }
.prose strong { font-weight: 650; }
.note { padding: var(--s-4) var(--s-5); border: 1px solid var(--c-warn-line); background: var(--c-warn-soft); border-radius: var(--r-md); font-size: .9375rem; }
.note b { color: var(--c-warn); }
.def { padding: var(--s-4) var(--s-5); border-radius: var(--r-md); background: var(--c-surface); border: 1px solid var(--c-border); }
.def dt { font-weight: 650; }
.def dd { color: var(--c-text-2); }
.def div + div { margin-top: var(--s-3); padding-top: var(--s-3); border-top: 1px solid var(--c-border); }

.table-scroll { border: 1px solid var(--c-border); border-radius: var(--r-md); background: var(--c-surface); box-shadow: var(--shadow-1); overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .9375rem; }
caption { text-align: left; padding: var(--s-4) var(--s-4) 0; font-weight: 600; }
th, td { padding: var(--s-3) var(--s-4); border-bottom: 1px solid var(--c-border); text-align: left; vertical-align: top; }
thead th { font-size: .75rem; letter-spacing: .06em; text-transform: uppercase; color: var(--c-text-3); background: var(--c-surface-alt); }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tfoot th, tfoot td { font-weight: 600; border-bottom: 0; }
tr.total th, tr.total td { border-top: 2px solid var(--c-text); font-size: 1.0625rem; }
@media (max-width: 40rem) { table { font-size: .8125rem; } th, td { padding: var(--s-2) var(--s-3); } }

.faq details { border-bottom: 1px solid var(--c-border); }
.faq summary { cursor: pointer; list-style: none; padding: var(--s-4) 0; font-weight: 600; display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; flex: none; width: 24px; height: 24px; border-radius: 50%; border: 1px solid var(--c-border-strong); background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M6 2v8M2 6h8' stroke='%231d1d1f' stroke-width='1.4' stroke-linecap='round'/%3E%3C/svg%3E") center/10px no-repeat; transition: transform var(--dur) var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 var(--s-4); color: var(--c-text-2); }

.cta-card { margin-top: var(--s-8); padding: var(--s-6); border-radius: var(--r-lg); background: var(--c-surface); border: 1px solid var(--c-border); box-shadow: var(--shadow-2); text-align: center; position: relative; overflow: hidden; isolation: isolate; }
.cta-card::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(ellipse 60% 90% at 50% 130%, rgba(0,102,204,.12), transparent 70%); }
.cta-card h2 { font-size: 1.375rem; letter-spacing: -.02em; }
.cta-card p { color: var(--c-text-2); margin: var(--s-2) 0 var(--s-5); }
.cta-card .row { display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: center; }

.related { margin-top: var(--s-7); }
.related h2 { font-size: 1.125rem; margin-bottom: var(--s-3); }
.related ul { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-3); }
@media (max-width: 40rem) { .related ul { grid-template-columns: 1fr; } }
.related a { display: flex; flex-direction: column; gap: var(--s-1); height: 100%; padding: var(--s-4); border: 1px solid var(--c-border); border-radius: var(--r-md); background: var(--c-surface); color: var(--c-text); text-decoration: none; transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease); }
.related a:hover { border-color: var(--c-accent); transform: translateY(-2px); }
.related small { font: 600 .6875rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--c-text-3); }
.related span { font-weight: 600; line-height: 1.35; }
.sources { margin-top: var(--s-7); font-size: .875rem; color: var(--c-text-2); }
.sources h2 { font-size: 1rem; }
.sources ol { padding-left: 1.2em; margin-top: var(--s-2); }
.publisher-note { margin-top: var(--s-5); font-size: .8125rem; color: var(--c-text-3); }

/* 5. Interactive modules ---------------------------------------------------- */
.module { margin-top: var(--s-6); border: 1px solid var(--c-border); border-radius: var(--r-lg); background: var(--c-surface); box-shadow: var(--shadow-2); overflow: hidden; }
.module__head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); padding: var(--s-4) var(--s-5); border-bottom: 1px solid var(--c-border); background: var(--c-surface-alt); }
.module__title { font-weight: 650; font-size: 1rem; }
.module__tag { font: 600 .6875rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--c-ai); background: var(--c-ai-soft); padding: 5px 9px; border-radius: var(--r-pill); }
.module__body { padding: var(--s-5); }
.module__foot { padding: var(--s-3) var(--s-5); border-top: 1px solid var(--c-border); font-size: .8125rem; color: var(--c-text-3); }

/* Invoice calculator */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); }
@media (max-width: 40rem) { .calc { grid-template-columns: 1fr; } }
.field-row { display: grid; gap: var(--s-1); }
.field-row + .field-row { margin-top: var(--s-3); }
.field-row label { font-size: .8125rem; font-weight: 600; color: var(--c-text-2); }
.input { display: flex; align-items: center; border: 1px solid var(--c-border-strong); border-radius: var(--r-sm); background: var(--c-surface); transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease); }
.input:focus-within { border-color: var(--c-accent); box-shadow: 0 0 0 3px var(--c-accent-soft); }
.input input { flex: 1; min-width: 0; border: 0; background: none; padding: var(--s-2) var(--s-3); font: 500 1rem var(--font-sans); font-variant-numeric: tabular-nums; color: var(--c-text); outline: none; }
.input span { padding-right: var(--s-3); color: var(--c-text-3); font-size: .875rem; }
.calc__out { border-radius: var(--r-md); background: var(--c-surface-alt); padding: var(--s-4); display: grid; gap: var(--s-2); align-content: start; }
.calc__line { display: flex; justify-content: space-between; gap: var(--s-3); font-size: .9375rem; color: var(--c-text-2); }
.calc__line b { color: var(--c-text); font-variant-numeric: tabular-nums; }
.calc__line.is-total { border-top: 1px solid var(--c-border-strong); padding-top: var(--s-2); font-size: 1.0625rem; color: var(--c-text); }
.split-bar { margin-top: var(--s-3); height: 10px; border-radius: var(--r-pill); background: var(--c-border); display: flex; overflow: hidden; }
.split-bar i { display: block; height: 100%; transition: width 500ms var(--ease); }
.split-bar .is-client { background: var(--c-text); }
.split-bar .is-insurer { background: var(--c-accent); }
.legend { display: flex; flex-wrap: wrap; gap: var(--s-3); font-size: .75rem; color: var(--c-text-3); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend span::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--sw); }

/* Annotated expert report */
.report { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); }
@media (max-width: 48rem) { .report { grid-template-columns: 1fr; } }
.report__doc { padding: var(--s-5); border-right: 1px solid var(--c-border); background: repeating-linear-gradient(0deg, transparent 0 27px, rgba(0,0,0,.025) 27px 28px), var(--c-surface); font-size: .8125rem; }
@media (max-width: 48rem) { .report__doc { border-right: 0; border-bottom: 1px solid var(--c-border); } }
.report__docTitle { font: 700 .75rem/1.2 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--c-text-2); margin-bottom: var(--s-3); }
.zone { display: block; width: 100%; text-align: left; font: inherit; color: inherit; background: none; border: 1px dashed transparent; border-radius: var(--r-sm); padding: var(--s-2) var(--s-3); margin-bottom: var(--s-2); cursor: pointer; position: relative; transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease); }
.zone:hover { border-color: var(--c-accent-line); background: rgba(0,102,204,.03); }
.zone[aria-pressed="true"] { border-color: var(--c-accent); border-style: solid; background: var(--c-accent-soft); }
.zone__n { position: absolute; right: var(--s-2); top: var(--s-2); width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font: 700 .6875rem/1 var(--font-mono); color: #fff; background: var(--c-accent); box-shadow: 0 0 0 0 rgba(0,102,204,.4); animation: ping 2.4s var(--ease) infinite; }
.zone[aria-pressed="true"] .zone__n { animation: none; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(0,102,204,.35); } 70% { box-shadow: 0 0 0 8px rgba(0,102,204,0); } 100% { box-shadow: 0 0 0 0 rgba(0,102,204,0); } }
.zone__label { display: block; font: 600 .6875rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--c-text-3); margin-bottom: 4px; }
.zone__rows { display: grid; gap: 2px; padding-right: 28px; }
.zone__rows span { display: flex; justify-content: space-between; gap: var(--s-3); }
.zone__rows b { font-weight: 600; font-variant-numeric: tabular-nums; }
.report__explain { padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-3); }
.report__explain h3 { font-size: 1.0625rem; letter-spacing: -.01em; }
.report__explain p { color: var(--c-text-2); font-size: .9375rem; }
.report__tip { margin-top: auto; padding: var(--s-3) var(--s-4); border-radius: var(--r-sm); background: var(--c-ai-soft); color: var(--c-ai); font-size: .8125rem; font-weight: 500; }
.report__nav { display: flex; gap: var(--s-2); }
.dots { display: flex; gap: 6px; align-items: center; }
.dots i { width: 6px; height: 6px; border-radius: 50%; background: var(--c-border-strong); transition: background-color var(--dur) var(--ease), width var(--dur) var(--ease); }
.dots i.is-on { width: 18px; border-radius: 3px; background: var(--c-accent); }

/* Interactive checklist */
.check-progress { display: flex; align-items: center; gap: var(--s-3); margin-bottom: var(--s-4); font-size: .875rem; color: var(--c-text-2); }
.check-progress__bar { flex: 1; height: 6px; border-radius: var(--r-pill); background: var(--c-border); overflow: hidden; }
.check-progress__bar i { display: block; height: 100%; width: 0; background: var(--c-ok); transition: width 400ms var(--ease); }
.checks { list-style: none; padding: 0; display: grid; gap: var(--s-2); }
.checks label { display: grid; grid-template-columns: 22px 1fr; gap: var(--s-3); align-items: start; padding: var(--s-3) var(--s-4); border: 1px solid var(--c-border); border-radius: var(--r-md); cursor: pointer; transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease); }
.checks label:hover { border-color: var(--c-border-strong); }
.checks input { appearance: none; -webkit-appearance: none; width: 20px; height: 20px; margin-top: 3px; border-radius: 6px; border: 1.5px solid var(--c-border-strong); display: grid; place-items: center; cursor: pointer; transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.checks input::after { content: ""; width: 10px; height: 6px; border-left: 2px solid #fff; border-bottom: 2px solid #fff; transform: rotate(-45deg) scale(0); transition: transform 200ms var(--ease); margin-top: -2px; }
.checks input:checked { background: var(--c-ok); border-color: var(--c-ok); }
.checks input:checked::after { transform: rotate(-45deg) scale(1); }
.checks input:checked + span { color: var(--c-text-3); }
.checks label:has(input:checked) { background: var(--c-ok-soft); border-color: #bfe3cf; }
.checks span b { display: block; font-weight: 600; color: var(--c-text); }
.checks span small { display: block; color: var(--c-text-2); font-size: .875rem; }
.check-done { margin-top: var(--s-4); padding: var(--s-3) var(--s-4); border-radius: var(--r-sm); background: var(--c-ok-soft); color: var(--c-ok); font-weight: 600; font-size: .9375rem; }

/* Claim journey (stepper timeline) */
.journey-wrap { position: relative; }
.prose .journey { padding-left: 0; }
.prose .journey li + li { margin-top: 0; }
.journey { list-style: none; padding: 0; position: relative; }
.journey::before { content: ""; position: absolute; left: 17px; top: 8px; bottom: 8px; width: 2px; background: var(--c-border); }
.journey__fill { z-index: 1; position: absolute; left: 17px; top: 8px; width: 2px; height: 0; background: linear-gradient(var(--c-accent), var(--c-ai)); transition: height 600ms var(--ease); }
.journey li { position: relative; padding: 0 0 var(--s-5) 52px; }
.journey li:last-child { padding-bottom: 0; }
.journey button { all: unset; cursor: pointer; display: block; width: 100%; }
.journey button:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 4px; border-radius: 6px; }
.journey__dot { z-index: 2; position: absolute; left: 6px; top: 2px; width: 24px; height: 24px; border-radius: 50%; background: var(--c-surface); border: 2px solid var(--c-border-strong); display: grid; place-items: center; font: 700 .6875rem/1 var(--font-mono); color: var(--c-text-3); transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease); }
.journey li.is-past .journey__dot { border-color: var(--c-accent); background: var(--c-accent); color: #fff; }
.journey li.is-current .journey__dot { border-color: var(--c-accent); color: var(--c-accent); box-shadow: 0 0 0 5px var(--c-accent-soft); }
.journey__who { font: 600 .6875rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--c-text-3); }
.journey__title { display: block; font-weight: 650; margin-top: 4px; }
.journey__detail { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 400ms var(--ease); }
.journey__detail > div { overflow: hidden; color: var(--c-text-2); font-size: .9375rem; }
.journey li.is-current .journey__detail { grid-template-rows: 1fr; }
.journey li.is-current .journey__detail > div { padding-top: var(--s-2); }
.journey__ac { display: flex; align-items: center; gap: 6px; margin-top: var(--s-2); font-size: .8125rem; font-weight: 600; color: var(--c-ai); }

/* Re-entry cost simulator */
.sim { display: grid; gap: var(--s-4); }
.range { display: grid; gap: var(--s-2); }
.range__top { display: flex; justify-content: space-between; font-size: .875rem; color: var(--c-text-2); }
.range__top output { font-weight: 700; color: var(--c-text); font-variant-numeric: tabular-nums; }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 6px; border-radius: var(--r-pill); background: linear-gradient(90deg, var(--c-accent) var(--fill, 50%), var(--c-border) var(--fill, 50%)); outline-offset: 6px; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%; background: #fff; border: 1px solid var(--c-border-strong); box-shadow: var(--shadow-2); cursor: grab; }
input[type="range"]::-moz-range-thumb { width: 20px; height: 20px; border-radius: 50%; background: #fff; border: 1px solid var(--c-border-strong); box-shadow: var(--shadow-2); cursor: grab; }
.sim__result { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-3); }
.sim__kpi { padding: var(--s-4); border-radius: var(--r-md); background: var(--c-surface-alt); }
.sim__kpi b { display: block; font-size: 1.75rem; font-weight: 700; letter-spacing: -.03em; font-variant-numeric: tabular-nums; line-height: 1.1; }
.sim__kpi span { font-size: .8125rem; color: var(--c-text-3); }

/* 6. Blog index ------------------------------------------------------------ */
.blog-hero { position: relative; overflow: hidden; isolation: isolate; padding: var(--s-8) var(--gutter) var(--s-6); text-align: center; }
.blog-hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(var(--c-border) 1px, transparent 1px), linear-gradient(90deg, var(--c-border) 1px, transparent 1px); background-size: 48px 48px; mask-image: radial-gradient(ellipse 60% 70% at 50% 0%, #000 10%, transparent 70%); -webkit-mask-image: radial-gradient(ellipse 60% 70% at 50% 0%, #000 10%, transparent 70%); opacity: .6; }
.blog-hero::after { content: ""; position: absolute; z-index: -1; left: 50%; top: -16rem; width: 56rem; height: 34rem; transform: translateX(-50%); background: radial-gradient(closest-side, rgba(91,75,219,.10), transparent); }
.blog-hero h1 { font-size: clamp(2.25rem, 1.4rem + 3.4vw, 4rem); line-height: 1.04; letter-spacing: -.04em; max-width: 16ch; margin: var(--s-4) auto 0; text-wrap: balance; }
.blog-hero p { max-width: 36rem; margin: var(--s-4) auto 0; color: var(--c-text-2); font-size: 1.125rem; }
.filters { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-2); margin-top: var(--s-6); }
.filter { font: 500 .875rem/1 var(--font-sans); padding: var(--s-2) var(--s-4); border-radius: var(--r-pill); border: 1px solid var(--c-border-strong); background: var(--c-surface); color: var(--c-text-2); cursor: pointer; transition: all var(--dur) var(--ease); }
.filter:hover { color: var(--c-text); border-color: var(--c-text-3); }
.filter[aria-pressed="true"] { background: var(--c-text); border-color: var(--c-text); color: #fff; }
.posts { max-width: var(--wide); margin: 0 auto; padding: var(--s-6) var(--gutter) var(--s-9); display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-4); }
@media (max-width: 64rem) { .posts { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 48rem) { .posts { grid-template-columns: 1fr; } }
.post { position: relative; display: flex; flex-direction: column; border: 1px solid var(--c-border); border-radius: var(--r-lg); background: var(--c-surface); overflow: hidden; box-shadow: var(--shadow-1); transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease); }
.post:hover { box-shadow: var(--shadow-3); transform: translateY(-3px); }
.post--featured { grid-column: 1 / -1; display: grid; grid-template-columns: 1.1fr 1fr; }
@media (max-width: 48rem) { .post--featured { grid-template-columns: 1fr; } }
.post__visual { position: relative; aspect-ratio: 16 / 9; background: var(--c-surface-alt); border-bottom: 1px solid var(--c-border); overflow: hidden; display: grid; place-items: center; }
.post--featured .post__visual { aspect-ratio: auto; min-height: 16rem; border-bottom: 0; border-right: 1px solid var(--c-border); }
@media (max-width: 48rem) { .post--featured .post__visual { border-right: 0; border-bottom: 1px solid var(--c-border); min-height: 12rem; } }
.post__visual svg { width: 78%; max-width: 360px; transition: transform 700ms var(--ease); }
.post:hover .post__visual svg { transform: scale(1.04) translateY(-4px); }
.post__body { padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-2); flex: 1; }
.post__meta { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-3); font-size: .75rem; color: var(--c-text-3); }
.tag { font: 600 .6875rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--c-accent); }
.tag--ia { color: var(--c-ai); }
.post h2 { font-size: 1.3125rem; line-height: 1.25; letter-spacing: -.02em; }
.post--featured h2 { font-size: 1.75rem; }
.post h2 a { color: var(--c-text); text-decoration: none; }
.post h2 a::after { content: ""; position: absolute; inset: 0; }
.post p { color: var(--c-text-2); font-size: .9375rem; }
.post__more { margin-top: auto; padding-top: var(--s-3); font-size: .875rem; font-weight: 600; color: var(--c-accent); }
.post__badge { display: inline-flex; align-items: center; gap: 6px; font-size: .75rem; font-weight: 600; color: var(--c-ai); background: var(--c-ai-soft); padding: 4px 10px; border-radius: var(--r-pill); width: fit-content; }
.post.is-hidden { display: none; }

/* 7. Motion ---------------------------------------------------------------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 700ms var(--ease), transform 700ms var(--ease); transition-delay: var(--d, 0ms); }
.js .reveal.is-in { opacity: 1; transform: none; }
.swap { animation: swap 380ms var(--ease); }
@keyframes swap { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .progress { display: none; }
}

/* ==========================================================================
   8. Immersive layer — article hero, reading HUD, chapters, tilt
   ========================================================================== */
.aurora { position: absolute; inset: -30% -10% auto -10%; height: 140%; z-index: -1; pointer-events: none; overflow: hidden; }
.aurora i { position: absolute; width: 46vw; height: 46vw; max-width: 680px; max-height: 680px; border-radius: 50%; filter: blur(80px); opacity: .5; animation: drift 24s ease-in-out infinite alternate; }
.aurora i:nth-child(1) { left: -5%; top: 5%; background: #cfe3ff; }
.aurora i:nth-child(2) { right: -5%; top: 0; background: #e3dcff; animation-duration: 28s; animation-delay: -8s; }
.aurora i:nth-child(3) { left: 35%; top: 40%; background: #d6f2ec; opacity: .35; animation-duration: 32s; animation-delay: -14s; }
@keyframes drift { 0% { transform: translate3d(0,0,0) scale(1); } 50% { transform: translate3d(5%, 6%, 0) scale(1.08); } 100% { transform: translate3d(-4%, 2%, 0) scale(.96); } }

.article-hero { position: relative; isolation: isolate; overflow: hidden; border-bottom: 1px solid var(--c-border); }
.article-hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(var(--c-border) 1px, transparent 1px), linear-gradient(90deg, var(--c-border) 1px, transparent 1px); background-size: 44px 44px; mask-image: radial-gradient(ellipse 80% 90% at 30% 0%, #000 10%, transparent 70%); -webkit-mask-image: radial-gradient(ellipse 80% 90% at 30% 0%, #000 10%, transparent 70%); opacity: .5; }
.article-hero__inner { max-width: var(--wide); margin: 0 auto; padding: var(--s-7) var(--gutter) var(--s-8); display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: var(--s-7); align-items: center; }
@media (max-width: 60rem) { .article-hero__inner { grid-template-columns: minmax(0, 1fr); gap: var(--s-6); padding-bottom: var(--s-7); } }
.hero-title { margin-top: var(--s-3); font-size: clamp(2.1rem, 1.3rem + 2.6vw, 3.25rem); line-height: 1.04; letter-spacing: -.04em; text-wrap: balance; background: linear-gradient(180deg, var(--c-text) 0%, #3a3a40 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.article-hero .dek { max-width: 36rem; }
.avatar--brand { background: var(--c-text); border-color: var(--c-text); position: relative; }
.avatar--brand::after { content: ""; position: absolute; inset: 0; margin: auto; width: 11px; height: 11px; border-radius: 3px; background: #fff; transform: rotate(45deg); }
.meta-chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-4); }
.meta-chips li { padding: 6px 12px; border-radius: var(--r-pill); border: 1px solid var(--c-border); background: rgba(255,255,255,.7); backdrop-filter: blur(6px); font-size: .8125rem; color: var(--c-text-2); }
.meta-chips li.is-tool { color: var(--c-ai); border-color: #d9d3ff; background: var(--c-ai-soft); font-weight: 600; }
.article-hero__visual { margin: 0; perspective: 1400px; }
.article-hero__visual .tilt { transform-style: preserve-3d; transform: rotateX(var(--rx, 4deg)) rotateY(var(--ry, -8deg)); transition: transform 600ms var(--ease); border-radius: 22px; box-shadow: var(--shadow-3), 0 40px 80px -30px rgba(0,102,204,.25); animation: hover-float 7s ease-in-out infinite; }
@keyframes hover-float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -8px; } }
.article-hero__visual figcaption { margin-top: var(--s-3); font-size: .75rem; color: var(--c-text-3); text-align: center; }
@media (max-width: 60rem) { .article-hero__visual .tilt { transform: none; animation: none; } }

/* Chapters: numbered H2 (sections are read in order) */
.prose { counter-reset: chapter; }
.prose h2 { counter-increment: chapter; position: relative; }
.prose h2::before { content: counter(chapter, decimal-leading-zero); display: block; margin-bottom: var(--s-2); font: 600 .75rem/1 var(--font-mono); letter-spacing: .1em; color: var(--c-accent); }

/* Reading HUD: ring in the TOC + chapter pill on small screens */
.toc__head { display: flex; align-items: center; gap: var(--s-2); margin-bottom: var(--s-3); }
.toc__head p { margin: 0; }
.toc__ring, .chapter-pill__ring { width: 18px; height: 18px; border-radius: 50%; flex: none; background: conic-gradient(var(--c-accent) calc(var(--read, 0) * 1turn), var(--c-border) 0); -webkit-mask: radial-gradient(circle, transparent 5px, #000 5.5px); mask: radial-gradient(circle, transparent 5px, #000 5.5px); }
.chapter-pill { position: fixed; z-index: 25; left: 50%; bottom: calc(var(--s-4) + env(safe-area-inset-bottom, 0px)); transform: translate(-50%, 140%); display: none; align-items: center; gap: var(--s-2); max-width: calc(100% - 2 * var(--gutter)); padding: 10px 16px; border-radius: var(--r-pill); background: rgba(29,29,31,.88); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); color: #fff; font-size: .8125rem; font-weight: 600; box-shadow: var(--shadow-3); transition: transform 400ms var(--ease); }
.chapter-pill__label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chapter-pill.is-on { transform: translate(-50%, 0); }
@media (max-width: 68rem) { .chapter-pill { display: flex; } }

/* Modules: soft glow border */
.module { position: relative; }
.module::before { content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; background: linear-gradient(130deg, transparent 30%, rgba(0,102,204,.5), rgba(91,75,219,.5), transparent 70%); background-size: 250% 250%; background-position: 100% 0; -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0); opacity: 0; transition: opacity 500ms var(--ease), background-position 1.2s var(--ease); pointer-events: none; }
.module:hover::before, .module:focus-within::before { opacity: 1; background-position: 0 100%; }

/* Blog index: immersive hero + tilting cards */
.blog-hero { overflow: hidden; }
.blog-hero .aurora { inset: -40% -10% auto -10%; }
.blog-hero h1 { background: linear-gradient(180deg, var(--c-text), #3a3a40); -webkit-background-clip: text; background-clip: text; color: transparent; }
.blog-hero h1 span { -webkit-text-fill-color: var(--c-accent); }
.post { transform-style: preserve-3d; }
.post.is-tilting { transition: box-shadow var(--dur) var(--ease); }

@media (prefers-reduced-motion: reduce) {
  .aurora i, .article-hero__visual .tilt { animation: none !important; }
  .article-hero__visual .tilt { transform: none; }
}
.blog-hero p.kicker { max-width: none; margin: var(--s-4) auto 0; font-size: .75rem; color: var(--c-accent); }

.related__more { margin-top: 16px; color: var(--c-text-2); } .related__more a { text-decoration: underline; text-underline-offset: 3px; }