/* IT Voice — token-driven stylesheet.
   Foundations come from the LetsVPN brand extraction (DESIGN.md §2). Tokens
   marked "derived" do not exist in the extraction: each one exists because a
   brand value fails WCAG 2.2 AA in the place it would otherwise be used, and
   DESIGN.md records the measured ratio that made it necessary. Components
   reference semantic tokens only; no raw colour appears below :root. */
:root {
  /* typography */
  --font-family-primary: Helvetica, Charter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 16.2px;
  --font-size-md: 18.9px;
  --font-size-lg: 21.6px;
  --font-size-xl: 24.3px;
  --font-size-2xl: 25.65px;
  --font-size-3xl: 27px;
  --font-size-4xl: 31.05px;
  --font-weight-base: 400;
  --font-weight-strong: 700;
  --font-line-height-base: normal;
  --font-line-height-tight: 1.35;   /* derived: headings that wrap */
  --font-line-height-prose: 1.85;   /* derived: CJK long-form reading */

  /* colour — extracted */
  --color-text-primary: #333333;
  --color-text-secondary: #697586;   /* 4.68:1 on surface-page only */
  --color-text-inverse: #747e8b;     /* 5.10:1 on surface-base */
  --color-border-strong: #ffffff;
  --color-surface-base: #000000;
  --color-surface-muted: #f7f7f7;
  --color-surface-strong: #4d96e3;   /* 3.09:1 on white: fills, icons, large text on dark */

  /* colour — derived */
  --color-surface-page: #ffffff;
  --color-surface-raised: #ffffff;
  --color-surface-base-raised: #111418;
  --color-text-on-base: #ffffff;
  --color-text-on-strong: #ffffff;   /* large bold text only (3.09:1) */
  --color-action: #1c64b3;           /* 5.96:1 with white; links and light-surface buttons */
  --color-action-hover: #154f8e;
  --color-action-active: #103d6e;
  --color-action-soft: #e8f1fb;
  --color-border-subtle: #dfe3e8;
  --color-focus-ring: #1c64b3;
  --color-focus-ring-on-base: #4d96e3;
  --color-error: #b42318;            /* 6.54:1 on white */
  --color-error-soft: #fdecea;
  --color-warning-soft: #fff6e0;
  --color-warning-text: #7a4b00;
  --color-disabled-surface: #e9ecef;
  --color-disabled-text: #6b7280;

  /* spacing — extracted */
  --space-1: 5.4px;
  --space-2: 6.07px;
  --space-3: 6.75px;
  --space-4: 9.45px;
  --space-5: 13.5px;
  --space-6: 15.53px;
  --space-7: 16.2px;
  --space-8: 18.9px;
  /* spacing — derived, integer multiples of space-5 (13.5px) */
  --space-9: 27px;
  --space-10: 40.5px;
  --space-11: 54px;
  --space-12: 81px;

  /* radius / shadow / motion — extracted */
  --radius-xs: 27px;
  --radius-sm: 38.48px;
  --radius-md: 50px;
  --radius-lg: 60.75px;
  --radius-xl: 67.5px;
  --radius-2xl: 153.9px;
  --radius-inline: 6.75px;           /* derived: code, tags — equals space-3 */
  --shadow-1: rgba(0, 0, 0, 0.06) 0px 1px 6px 0px, rgba(0, 0, 0, 0.16) 0px 2px 32px 0px;
  --motion-duration-instant: 167ms;

  /* layout */
  --layout-max: 1180px;
  --layout-prose: 720px;
  --layout-gutter: var(--space-7);
  --control-height: 50px;
  --header-height: 64px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--header-height) + var(--space-5)); }
body {
  margin: 0;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-base);
  line-height: var(--font-line-height-base);
  color: var(--color-text-primary);
  background: var(--color-surface-page);
  overflow-wrap: anywhere;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--color-action); text-underline-offset: 3px; }
a:hover { color: var(--color-action-hover); }
a:active { color: var(--color-action-active); }
:focus-visible { outline: 3px solid var(--color-focus-ring); outline-offset: 3px; border-radius: var(--radius-inline); }
.on-base :focus-visible, .on-base:focus-visible { outline-color: var(--color-focus-ring-on-base); }
h1, h2, h3, h4 { line-height: var(--font-line-height-tight); font-weight: var(--font-weight-strong); margin: 0; color: var(--color-text-primary); }
p { margin: 0; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: 0ms !important; animation-duration: 0ms !important; } }

.container { width: 100%; max-width: var(--layout-max); margin: 0 auto; padding: 0 var(--layout-gutter); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: var(--space-5); top: -100px; z-index: 100; background: var(--color-surface-base); color: var(--color-text-on-base); padding: var(--space-4) var(--space-7); border-radius: var(--radius-xs); }
.skip-link:focus-visible { top: var(--space-5); color: var(--color-text-on-base); outline-color: var(--color-focus-ring-on-base); }

/* ---------- button ---------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-3);
  min-height: var(--control-height); padding: 0 var(--space-9);
  border-radius: var(--radius-xs); border: 2px solid transparent;
  font: var(--font-weight-strong) var(--font-size-md)/1 var(--font-family-primary);
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background-color var(--motion-duration-instant) ease, color var(--motion-duration-instant) ease, border-color var(--motion-duration-instant) ease, transform var(--motion-duration-instant) ease;
}
.btn-primary { background: var(--color-action); color: var(--color-text-on-base); }
.btn-primary:hover { background: var(--color-action-hover); color: var(--color-text-on-base); }
.btn-primary:active { background: var(--color-action-active); color: var(--color-text-on-base); transform: translateY(1px); }
.btn-brand { background: var(--color-surface-strong); color: var(--color-text-on-strong); }
.btn-brand:hover { background: var(--color-action); color: var(--color-text-on-base); }
.btn-brand:active { background: var(--color-action-active); color: var(--color-text-on-base); transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--color-text-on-base); border-color: var(--color-border-strong); }
.btn-ghost:hover { background: var(--color-text-on-base); color: var(--color-surface-base); }
.btn-ghost:active { transform: translateY(1px); }
.btn-outline { background: var(--color-surface-page); color: var(--color-action); border-color: var(--color-action); }
.btn-outline:hover { background: var(--color-action-soft); color: var(--color-action-hover); }
.btn-sm { min-height: 44px; padding: 0 var(--space-8); font-size: var(--font-size-md); }
.btn[aria-disabled="true"], .btn:disabled { background: var(--color-disabled-surface); color: var(--color-disabled-text); border-color: transparent; cursor: not-allowed; transform: none; }
.btn.is-loading { pointer-events: none; }
.btn.is-loading::before { content: ""; width: 1em; height: 1em; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin 0.8s linear infinite; }
.btn.is-error { background: var(--color-error); color: var(--color-text-on-base); }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- header ---------------------------------------------------- */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--color-surface-page); border-bottom: 1px solid var(--color-border-subtle); }
.site-header .container { display: flex; align-items: center; gap: var(--space-9); min-height: var(--header-height); }
.brand { display: inline-flex; align-items: center; gap: var(--space-4); text-decoration: none; color: var(--color-text-primary); font-weight: var(--font-weight-strong); font-size: var(--font-size-lg); }
.brand:hover { color: var(--color-text-primary); }
.brand svg { width: 34px; height: 34px; }
.brand small { display: block; font-size: var(--font-size-xs); font-weight: var(--font-weight-base); color: var(--color-text-secondary); }
.nav-main { display: flex; gap: var(--space-2); margin-left: auto; }
.nav-main a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 var(--space-5); border-radius: var(--radius-xs); color: var(--color-text-primary); text-decoration: none; font-size: var(--font-size-sm); }
.nav-main a:hover { background: var(--color-surface-muted); color: var(--color-text-primary); }
.nav-main a[aria-current="page"] { color: var(--color-action); font-weight: var(--font-weight-strong); }
.nav-toggle { display: none; margin-left: auto; }
.nav-toggle summary { list-style: none; display: inline-flex; align-items: center; gap: var(--space-3); min-height: 44px; padding: 0 var(--space-7); border-radius: var(--radius-xs); border: 1px solid var(--color-border-subtle); cursor: pointer; font-size: var(--font-size-sm); }
.nav-toggle summary::-webkit-details-marker { display: none; }
.nav-toggle summary:hover { background: var(--color-surface-muted); }
.nav-toggle[open] summary { background: var(--color-surface-base); color: var(--color-text-on-base); }
.nav-drawer { position: absolute; left: 0; right: 0; top: 100%; background: var(--color-surface-page); border-bottom: 1px solid var(--color-border-subtle); box-shadow: var(--shadow-1); padding: var(--space-5) var(--layout-gutter) var(--space-9); display: grid; gap: var(--space-2); }
.nav-drawer a { display: flex; align-items: center; min-height: 48px; padding: 0 var(--space-7); border-radius: var(--radius-xs); color: var(--color-text-primary); text-decoration: none; font-size: var(--font-size-md); }
.nav-drawer a:hover { background: var(--color-surface-muted); }
.nav-drawer .btn { margin-top: var(--space-5); }
@media (max-width: 960px) {
  .nav-main, .site-header .header-cta { display: none; }
  .nav-toggle { display: block; }
}

/* ---------- disclosure bar -------------------------------------------- */
.disclosure-bar { background: var(--color-surface-muted); font-size: var(--font-size-xs); color: var(--color-text-primary); }
.disclosure-bar .container { padding-top: var(--space-3); padding-bottom: var(--space-3); line-height: 1.6; }

/* ---------- hero ------------------------------------------------------ */
.hero { background: var(--color-surface-base); color: var(--color-text-on-base); padding: var(--space-12) 0 var(--space-11); overflow: hidden; }
.hero .container { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: var(--space-10); align-items: center; }
.hero h1 { color: var(--color-text-on-base); font-size: var(--font-size-4xl); }
.hero .eyebrow { display: inline-block; margin-bottom: var(--space-7); padding: var(--space-2) var(--space-7); border-radius: var(--radius-xs); border: 1px solid var(--color-surface-strong); color: var(--color-surface-strong); font-size: var(--font-size-xs); letter-spacing: 0.04em; }
.hero .lead { margin-top: var(--space-8); color: var(--color-text-on-base); opacity: 1; font-size: var(--font-size-md); line-height: var(--font-line-height-prose); max-width: 34em; }
.hero .facts { display: flex; flex-wrap: wrap; gap: var(--space-9); margin: var(--space-9) 0 0; padding: 0; list-style: none; }
.hero .facts li { color: var(--color-text-inverse); font-size: var(--font-size-xs); }
.hero .facts strong { display: block; color: var(--color-text-on-base); font-size: var(--font-size-3xl); }
.hero .actions { display: flex; flex-wrap: wrap; gap: var(--space-5); margin-top: var(--space-10); }
.hero .art { justify-self: end; width: 100%; max-width: 420px; }
@media (max-width: 860px) {
  .hero { padding: var(--space-10) 0; }
  .hero .container { grid-template-columns: 1fr; }
  .hero .art { justify-self: center; max-width: 190px; order: -1; }
}

/* ---------- sections, cards ------------------------------------------- */
.band { padding: var(--space-11) 0; }
.band-muted { background: var(--color-surface-muted); }
.band-head { display: flex; align-items: end; justify-content: space-between; gap: var(--space-7); margin-bottom: var(--space-9); flex-wrap: wrap; }
.band-head h2 { font-size: var(--font-size-3xl); }
.band-head p { margin-top: var(--space-4); color: var(--color-text-secondary); }
.band-muted .band-head p { color: var(--color-text-primary); }
.grid { display: grid; gap: var(--space-9); grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.card { position: relative; display: flex; flex-direction: column; background: var(--color-surface-raised); border-radius: var(--radius-xs); box-shadow: var(--shadow-1); overflow: hidden; transition: transform var(--motion-duration-instant) ease; }
.card:hover { transform: translateY(-2px); }
.card:focus-within { outline: 3px solid var(--color-focus-ring); outline-offset: 3px; }
.card .cover { aspect-ratio: 16 / 9; background: var(--color-surface-base); }
.card .cover svg { width: 100%; height: 100%; }
.card-body { display: flex; flex-direction: column; gap: var(--space-4); padding: var(--space-8) var(--space-9) var(--space-9); flex: 1; }
.card-kicker { font-size: var(--font-size-xs); color: var(--color-action); font-weight: var(--font-weight-strong); }
.card h3 { font-size: var(--font-size-md); }
.card h3 a { color: var(--color-text-primary); text-decoration: none; }
.card h3 a::after { content: ""; position: absolute; inset: 0; }
.card h3 a:focus-visible { outline: none; }
.card p { color: var(--color-text-secondary); font-size: var(--font-size-sm); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { margin-top: auto; font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-9); counter-reset: step; list-style: none; margin: 0; padding: 0; }
.steps li { background: var(--color-surface-raised); border-radius: var(--radius-xs); box-shadow: var(--shadow-1); padding: var(--space-9); counter-increment: step; }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 40.5px; height: 40.5px; border-radius: 50%; background: var(--color-surface-base); color: var(--color-text-on-base); font-weight: var(--font-weight-strong); margin-bottom: var(--space-7); }
.steps h3 { font-size: var(--font-size-md); margin-bottom: var(--space-4); }
.steps p { color: var(--color-text-secondary); line-height: 1.7; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.platforms { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-8); }
.platforms a { position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr); grid-template-rows: auto auto; gap: var(--space-7) var(--space-7); padding: var(--space-9); border-radius: var(--radius-xs); background: var(--color-surface-raised); box-shadow: var(--shadow-1); border: 2px solid transparent; color: var(--color-text-primary); text-decoration: none; transition: transform var(--motion-duration-instant) ease, border-color var(--motion-duration-instant) ease; }
.platforms a:hover { transform: translateY(-2px); border-color: var(--color-surface-strong); color: var(--color-text-primary); }
.platforms a:active { transform: translateY(0); }
.plat-icon { grid-row: 1; display: grid; place-items: center; width: 54px; height: 54px; border-radius: 50%; background: var(--color-surface-base); color: var(--color-surface-strong); transition: background-color var(--motion-duration-instant) ease, color var(--motion-duration-instant) ease; }
.platforms a:hover .plat-icon { background: var(--color-surface-strong); color: var(--color-text-on-strong); }
.plat-go { grid-row: 1; justify-self: end; align-self: start; display: grid; place-items: center; width: 40.5px; height: 40.5px; border-radius: 50%; background: var(--color-surface-muted); color: var(--color-action); transition: transform var(--motion-duration-instant) ease, background-color var(--motion-duration-instant) ease; }
.platforms a:hover .plat-go { transform: translateX(3px); background: var(--color-action-soft); }
.plat-text { grid-column: 1 / -1; display: grid; gap: var(--space-2); }
.plat-text strong { font-size: var(--font-size-md); }
.plat-text span { font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.plat-text em { font-style: normal; justify-self: start; margin-top: var(--space-4); padding: var(--space-1) var(--space-5); border-radius: var(--radius-xs); background: var(--color-surface-muted); font-size: var(--font-size-xs); color: var(--color-text-primary); }
@media (max-width: 960px) { .platforms { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 420px) { .platforms { grid-template-columns: 1fr; } }
.empty { padding: var(--space-10); text-align: center; border-radius: var(--radius-xs); background: var(--color-surface-muted); }
.empty p { color: var(--color-text-primary); }

/* ---------- article --------------------------------------------------- */
.page-head { padding: var(--space-10) 0 var(--space-9); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: var(--space-3); list-style: none; margin: 0 0 var(--space-7); padding: 0; font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.breadcrumbs li + li::before { content: "/"; margin-right: var(--space-3); }
.breadcrumbs a { color: var(--color-text-secondary); }
.page-head h1 { font-size: var(--font-size-4xl); max-width: 24em; }
.page-head .dek { margin-top: var(--space-7); font-size: var(--font-size-md); line-height: var(--font-line-height-prose); color: var(--color-text-secondary); max-width: 40em; }
.byline { display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-8); margin-top: var(--space-8); font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.byline a { color: var(--color-text-secondary); }
.article-cover { border-radius: var(--radius-xs); overflow: hidden; aspect-ratio: 21 / 8; background: var(--color-surface-base); margin-bottom: var(--space-10); }
.article-cover svg { width: 100%; height: 100%; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: var(--space-11); align-items: start; padding-bottom: var(--space-11); }
.layout > * { min-width: 0; }
.aside { position: sticky; top: calc(var(--header-height) + var(--space-8)); display: grid; gap: var(--space-9); }
@media (max-width: 1000px) {
  .layout { grid-template-columns: 1fr; gap: var(--space-10); }
  .aside { position: static; }
  .article-cover { aspect-ratio: 16 / 9; }
}
.toc { border-radius: var(--radius-xs); background: var(--color-surface-muted); padding: var(--space-8) var(--space-9); }
.toc h2 { font-size: var(--font-size-sm); margin-bottom: var(--space-5); }
.toc ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.toc ul ul { padding-left: var(--space-7); margin-top: var(--space-2); }
.toc a { display: block; padding: var(--space-2) 0; color: var(--color-text-primary); text-decoration: none; font-size: var(--font-size-xs); line-height: 1.6; }
.toc a:hover { color: var(--color-action); text-decoration: underline; }
@media (max-width: 1000px) { .toc-desktop { display: none; } }
.toc-mobile { margin-bottom: var(--space-9); }
.toc-mobile summary { cursor: pointer; font-weight: var(--font-weight-strong); min-height: 44px; display: flex; align-items: center; }
@media (min-width: 1001px) { .toc-mobile { display: none; } }

.verdict { border-radius: var(--radius-xs); border: 2px solid var(--color-surface-strong); padding: var(--space-8) var(--space-9); margin-bottom: var(--space-10); background: var(--color-action-soft); }
.verdict h2 { font-size: var(--font-size-md); margin-bottom: var(--space-5); color: var(--color-action-active); }
.verdict ul { margin: 0; padding-left: var(--space-8); display: grid; gap: var(--space-4); line-height: 1.75; }

.prose { font-size: var(--font-size-sm); line-height: var(--font-line-height-prose); max-width: var(--layout-prose); }
.prose > * + * { margin-top: var(--space-8); }
.prose h2 { font-size: var(--font-size-2xl); margin-top: var(--space-11); padding-top: var(--space-5); }
.prose h3 { font-size: var(--font-size-lg); margin-top: var(--space-10); }
.prose h4 { font-size: var(--font-size-md); margin-top: var(--space-9); }
.prose ul, .prose ol { padding-left: var(--space-9); }
.prose li + li { margin-top: var(--space-3); }
.prose strong { color: var(--color-text-primary); }
.prose blockquote { margin-left: 0; padding: var(--space-5) var(--space-8); border-left: 4px solid var(--color-surface-strong); background: var(--color-surface-muted); border-radius: 0 var(--radius-xs) var(--radius-xs) 0; }
.prose code { font-size: 0.92em; background: var(--color-surface-muted); padding: 0.1em 0.4em; border-radius: var(--radius-inline); }
.prose hr { border: 0; border-top: 1px solid var(--color-border-subtle); }
.prose img { border-radius: var(--radius-xs); height: auto; }
.table-wrap { overflow-x: auto; border-radius: var(--radius-xs); border: 1px solid var(--color-border-subtle); -webkit-overflow-scrolling: touch; background: linear-gradient(90deg, var(--color-surface-page) 30%, transparent) left / 40px 100% no-repeat local, linear-gradient(270deg, var(--color-surface-page) 30%, transparent) right / 40px 100% no-repeat local, linear-gradient(90deg, rgba(0,0,0,.12), transparent) left / 12px 100% no-repeat scroll, linear-gradient(270deg, rgba(0,0,0,.12), transparent) right / 12px 100% no-repeat scroll; }
.table-wrap:focus-visible { outline-offset: 2px; }
.prose table { width: 100%; min-width: 520px; border-collapse: collapse; font-size: var(--font-size-xs); line-height: 1.6; }
.prose th { text-align: left; background: var(--color-surface-base); color: var(--color-text-on-base); font-weight: var(--font-weight-strong); padding: var(--space-5) var(--space-7); }
.prose td { padding: var(--space-5) var(--space-7); border-top: 1px solid var(--color-border-subtle); vertical-align: top; }
.prose tbody tr:nth-child(even) td { background: var(--color-surface-muted); }

.callout { border-radius: var(--radius-xs); padding: var(--space-7) var(--space-9); line-height: 1.75; }
.callout-tip { background: var(--color-action-soft); }
.callout-warn { background: var(--color-warning-soft); color: var(--color-warning-text); }
.callout-warn strong { color: var(--color-warning-text); }
.callout > strong:first-child { display: block; margin-bottom: var(--space-3); }

.cite { white-space: nowrap; font-size: 0.86em; color: var(--color-text-secondary); }
.cite a { color: var(--color-text-secondary); text-decoration-style: dotted; }
.srcnote { margin-top: var(--space-4) !important; font-size: var(--font-size-xs); color: var(--color-text-secondary); }

/* ---------- referral / CTA -------------------------------------------- */
.cta-card { border-radius: var(--radius-xs); background: var(--color-surface-base); color: var(--color-text-on-base); padding: var(--space-9); display: grid; gap: var(--space-5); box-shadow: var(--shadow-1); }
.cta-card h2, .cta-card h3 { color: var(--color-text-on-base); font-size: var(--font-size-lg); }
.cta-card p { color: var(--color-text-on-base); line-height: 1.7; font-size: var(--font-size-sm); }
.cta-card .fine { color: var(--color-text-inverse); font-size: var(--font-size-xs); }
.cta-card ul { margin: 0; padding: 0; list-style: none; display: grid; gap: var(--space-3); font-size: var(--font-size-xs); color: var(--color-text-on-base); }
.cta-card ul li::before { content: "✓"; color: var(--color-surface-strong); margin-right: var(--space-3); }
.cta-inline { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: var(--space-8); margin: var(--space-10) 0; }
@media (max-width: 640px) { .cta-inline { grid-template-columns: 1fr; } .cta-inline .btn { width: 100%; } }
.cta-band { background: var(--color-surface-base); color: var(--color-text-on-base); padding: var(--space-11) 0; }
.cta-band .container { display: flex; align-items: center; justify-content: space-between; gap: var(--space-9); flex-wrap: wrap; }
.cta-band h2 { color: var(--color-text-on-base); font-size: var(--font-size-3xl); }
.cta-band p { color: var(--color-text-inverse); margin-top: var(--space-4); }

/* ---------- faq ------------------------------------------------------- */
.faq { margin-top: var(--space-11); max-width: var(--layout-prose); }
.faq > h2 { font-size: var(--font-size-2xl); margin-bottom: var(--space-8); }
.faq details { border-bottom: 1px solid var(--color-border-subtle); }
.faq details:first-of-type { border-top: 1px solid var(--color-border-subtle); }
.faq summary { list-style: none; display: flex; justify-content: space-between; align-items: center; gap: var(--space-7); min-height: 56px; padding: var(--space-5) var(--space-3); cursor: pointer; font-weight: var(--font-weight-strong); font-size: var(--font-size-sm); line-height: 1.5; border-radius: var(--radius-inline); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--color-action); }
.faq summary .sign { flex: none; width: 27px; height: 27px; border-radius: 50%; display: grid; place-items: center; background: var(--color-surface-muted); transition: transform var(--motion-duration-instant) ease; }
.faq details[open] summary .sign { transform: rotate(45deg); background: var(--color-surface-base); color: var(--color-text-on-base); }
.faq .answer { padding: 0 var(--space-3) var(--space-8); line-height: var(--font-line-height-prose); }
.faq .answer > * + * { margin-top: var(--space-5); }

.sources { margin-top: var(--space-11); max-width: var(--layout-prose); padding: var(--space-8) var(--space-9); border-radius: var(--radius-xs); background: var(--color-surface-muted); font-size: var(--font-size-xs); line-height: 1.7; }
.sources h2 { font-size: var(--font-size-sm); margin-bottom: var(--space-4); }
.sources ol { margin: 0; padding-left: var(--space-8); }
.sources .fine { margin-top: var(--space-5); color: var(--color-text-primary); }
.related { margin-top: var(--space-11); }
.related > h2 { font-size: var(--font-size-2xl); margin-bottom: var(--space-8); }

/* ---------- pagination ------------------------------------------------ */
.pager { display: flex; justify-content: center; gap: var(--space-4); margin-top: var(--space-10); flex-wrap: wrap; }
.pager a, .pager span { display: inline-grid; place-items: center; min-width: 44px; min-height: 44px; padding: 0 var(--space-5); border-radius: var(--radius-xs); text-decoration: none; background: var(--color-surface-raised); box-shadow: var(--shadow-1); color: var(--color-text-primary); }
.pager a:hover { color: var(--color-action); }
.pager [aria-current="page"] { background: var(--color-surface-base); color: var(--color-text-on-base); }
.pager .is-disabled { color: var(--color-disabled-text); background: var(--color-disabled-surface); box-shadow: none; }

/* ---------- footer ---------------------------------------------------- */
.site-footer { background: var(--color-surface-base); color: var(--color-text-inverse); padding: var(--space-11) 0 var(--space-9); font-size: var(--font-size-xs); }
.site-footer .cols { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: var(--space-10); }
.site-footer h2 { color: var(--color-text-on-base); font-size: var(--font-size-sm); margin-bottom: var(--space-7); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.site-footer a { display: inline-flex; align-items: center; min-height: 32px; color: var(--color-text-on-base); text-decoration: none; }
.site-footer a:hover { color: var(--color-surface-strong); text-decoration: underline; }
.site-footer .brand { color: var(--color-text-on-base); }
.site-footer .brand small { color: var(--color-text-inverse); }
.site-footer .blurb { margin-top: var(--space-7); line-height: 1.8; max-width: 30em; }
.site-footer .legal { margin-top: var(--space-10); padding-top: var(--space-8); border-top: 1px solid var(--color-surface-base-raised); line-height: 1.8; }
@media (max-width: 860px) { .site-footer .cols { grid-template-columns: 1fr 1fr; } .site-footer .cols > :first-child { grid-column: 1 / -1; } }

/* ---------- redirect page --------------------------------------------- */
.go-page { min-height: 100vh; display: grid; place-items: center; padding: var(--space-9); background: var(--color-surface-muted); }
.go-card { max-width: 32em; text-align: center; background: var(--color-surface-raised); border-radius: var(--radius-xs); box-shadow: var(--shadow-1); padding: var(--space-10); display: grid; gap: var(--space-7); line-height: 1.7; }
.go-card[data-state="error"] .go-msg { color: var(--color-error); }
.go-card .fine { font-size: var(--font-size-xs); color: var(--color-text-secondary); }

/* ---------- icons ----------------------------------------------------- */
.icon { flex: none; display: inline-block; vertical-align: middle; }
.btn .icon { margin-left: calc(var(--space-2) * -1); }
.nav-drawer a .icon { margin-right: var(--space-5); color: var(--color-action); }
.nav-toggle summary .icon { margin: 0; }
.h-icon { display: inline-grid; place-items: center; width: 40.5px; height: 40.5px; margin-right: var(--space-5); border-radius: 50%; background: var(--color-surface-base); color: var(--color-surface-strong); vertical-align: middle; position: relative; top: -2px; }
.band-muted .h-icon { background: var(--color-surface-raised); color: var(--color-action); box-shadow: var(--shadow-1); }
.h-icon-dark { background: var(--color-surface-base-raised); }
.band-head h2 { display: flex; align-items: center; }
.hero .facts li { display: flex; align-items: flex-start; gap: var(--space-4); }
.fact-icon { display: grid; place-items: center; width: 32px; height: 32px; margin-top: 3px; border-radius: 50%; border: 1px solid var(--color-surface-strong); color: var(--color-surface-strong); }
.steps li { position: relative; }
.step-icon { position: absolute; top: var(--space-9); right: var(--space-9); display: grid; place-items: center; width: 40.5px; height: 40.5px; border-radius: 50%; background: var(--color-action-soft); color: var(--color-action); }
.card-kicker { display: inline-flex; align-items: center; gap: var(--space-2); }
.card-meta { display: inline-flex; align-items: center; gap: var(--space-2); }
.byline span { display: inline-flex; align-items: center; gap: var(--space-2); }
.byline .icon { color: var(--color-action); }
.verdict h2 { display: flex; align-items: center; gap: var(--space-3); }
.verdict ul { list-style: none; padding-left: 0; }
.verdict li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-4); }
.verdict .li-icon { margin-top: 5px; color: var(--color-action); }
.toc h2, .toc-mobile summary { display: flex; align-items: center; gap: var(--space-3); }
.toc h2 .icon, .toc-mobile summary .icon { color: var(--color-action); }
.faq > h2, .related > h2, .sources h2 { display: flex; align-items: center; gap: var(--space-4); }
.faq > h2 .icon, .related > h2 .icon { color: var(--color-action); }
.callout { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-5); }
.callout-icon { margin-top: 3px; color: var(--color-action); }
.callout-warn .callout-icon { color: var(--color-warning-text); }
.cta-badge { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--color-surface-strong); color: var(--color-text-on-strong); }
.cta-card ul li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-3); align-items: start; }
.cta-card ul li::before { content: none; }
.cta-card ul .icon { color: var(--color-surface-strong); margin-top: 1px; }
.cta-inline { grid-template-columns: auto minmax(0, 1fr) auto; }
@media (max-width: 640px) { .cta-inline { grid-template-columns: 1fr; } }
.cta-band h2 { display: flex; align-items: center; }
.site-footer li a { gap: var(--space-3); }
.site-footer li a .icon { color: var(--color-surface-strong); }

/* ---------- latest articles ------------------------------------------- */
.latest { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); grid-template-rows: repeat(4, auto); gap: var(--space-8); }
.card-feature { grid-row: 1 / span 4; }
.card-feature h3 { font-size: var(--font-size-xl); }
.card-feature .cover { aspect-ratio: 16 / 10; }
.card-row { flex-direction: row; align-items: stretch; }
.card-row .cover { flex: none; width: 36%; aspect-ratio: auto; min-height: 104px; }
.card-row .card-body { padding: var(--space-6) var(--space-8); gap: var(--space-3); }
.card-row h3 { font-size: var(--font-size-sm); line-height: 1.5; }
@media (max-width: 860px) {
  .latest { grid-template-columns: 1fr; grid-template-rows: none; }
  .card-feature { grid-row: auto; }
}
@media (max-width: 420px) { .card-row .cover { width: 32%; } }
.toc-mobile summary { list-style: none; }
.toc-mobile summary::-webkit-details-marker { display: none; }
.toc-mobile summary::after { content: ""; margin-left: auto; width: 9px; height: 9px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg) translate(-2px, -2px); transition: transform var(--motion-duration-instant) ease; }
.toc-mobile[open] summary::after { transform: rotate(-135deg) translate(-2px, -2px); }
.toc-mobile[open] summary { margin-bottom: var(--space-5); }