/* ==========================================================================
   valteris.online — stylesheet
   Self-hosted, no web fonts, no third-party requests, no tracking.
   Publisher: DER MONEY s.r.o.
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "Noto Sans", Arial, "Liberation Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --ink:        #101322;
  --ink-soft:   #454b63;
  --ink-faint:  #6b7189;
  --line:       #e2e5ef;
  --line-soft:  #eef0f7;
  --bg:         #ffffff;
  --bg-alt:     #f6f7fb;
  --bg-sunk:    #eef0f8;

  --brand:      #4b46d6;
  --brand-dark: #342fb0;
  --brand-soft: #eeedfd;
  --brand-ink:  #211d72;

  --accent:     #0f9b8e;
  --accent-soft:#e3f5f3;

  --warn:       #9a5b00;
  --warn-soft:  #fdf3e2;
  --warn-line:  #f0dcb8;

  --radius:     14px;
  --radius-sm:  9px;
  --shadow:     0 1px 2px rgba(16, 19, 34, .05), 0 8px 24px rgba(16, 19, 34, .06);
  --shadow-lg:  0 2px 4px rgba(16, 19, 34, .06), 0 18px 48px rgba(16, 19, 34, .10);

  --maxw:       1180px;
  --measure:    70ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:        #eef0f8;
    --ink-soft:   #b6bbd0;
    --ink-faint:  #8c93ad;
    --line:       #2a2f45;
    --line-soft:  #222639;
    --bg:         #0e1120;
    --bg-alt:     #151a2c;
    --bg-sunk:    #1b2034;

    --brand:      #9a95ff;
    --brand-dark: #b6b2ff;
    --brand-soft: #1e1f47;
    --brand-ink:  #cfccff;

    --accent:     #4fd2c2;
    --accent-soft:#12312f;

    --warn:       #f0c07a;
    --warn-soft:  #2e2415;
    --warn-line:  #4a3a1d;

    --shadow:     0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
    --shadow-lg:  0 2px 4px rgba(0, 0, 0, .45), 0 18px 48px rgba(0, 0, 0, .40);
  }
}

/* --------------------------------------------------------------- base --- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--brand); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--brand-dark); }

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

h1, h2, h3, h4 {
  line-height: 1.22;
  letter-spacing: -.018em;
  margin: 0 0 .5em;
  font-weight: 700;
  color: var(--ink);
}

h1 { font-size: clamp(2rem, 1.35rem + 2.6vw, 3.05rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.45rem, 1.15rem + 1.2vw, 1.95rem); margin-top: 2.4em; }
h3 { font-size: clamp(1.13rem, 1.02rem + .45vw, 1.32rem); margin-top: 1.9em; }
h4 { font-size: 1.02rem; }

p { margin: 0 0 1.15em; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.6rem 0;
}

code {
  font-family: var(--font-mono);
  font-size: .87em;
  background: var(--bg-sunk);
  padding: .14em .38em;
  border-radius: 5px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: .7rem 1.1rem;
  z-index: 200;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; color: #fff; }

.shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* ------------------------------------------------- disclosure top bar --- */

.disclosure-bar {
  background: var(--brand-ink);
  color: #fff;
  font-size: .82rem;
  line-height: 1.5;
  padding: .6rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, .12);
}
@media (prefers-color-scheme: dark) {
  .disclosure-bar { background: #1b1c44; }
}
.disclosure-bar .shell {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
  justify-content: center;
  text-align: center;
  flex-wrap: wrap;
}
.disclosure-bar strong { font-weight: 700; }
.disclosure-bar a { color: #fff; text-decoration: underline; }
.disclosure-bar a:hover { color: #fff; }
.disclosure-bar svg { flex: none; margin-top: .18rem; }

/* ------------------------------------------------------------- header --- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(150%) blur(10px);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--line);
}
@supports not (backdrop-filter: blur(4px)) {
  .site-head { background: var(--bg); }
}
.site-head .shell {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  min-height: 62px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -.028em;
  color: var(--ink);
  text-decoration: none;
  flex: none;
}
.brand:hover { color: var(--ink); }
.brand-mark { width: 30px; height: 30px; flex: none; }
.brand-name b { color: var(--brand); font-weight: 700; }
.brand-tag {
  display: block;
  font-size: .64rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  line-height: 1.2;
}

.nav-toggle {
  margin-left: auto;
  display: none;
  align-items: center;
  gap: .45rem;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  font-size: .86rem;
  font-weight: 600;
  padding: .42rem .7rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: .25rem;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .9rem;
  font-weight: 550;
  padding: .4rem .62rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.site-nav a:hover { background: var(--bg-alt); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--brand); background: var(--brand-soft); }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .4rem 0 .9rem;
    border-top: 1px solid var(--line);
    margin-top: .2rem;
  }
  .site-head .shell { flex-wrap: wrap; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: .6rem .3rem; }
}

/* ------------------------------------------------------------ layout --- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: clamp(1.6rem, 3.5vw, 3.2rem);
  align-items: start;
  padding-block: clamp(1.6rem, 3vw, 2.6rem) 3.5rem;
}
@media (max-width: 1000px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

.page { padding-block: clamp(1.6rem, 3vw, 2.6rem) 3.5rem; }
.page .prose, .page > h1 { max-width: var(--measure); }

.prose { max-width: var(--measure); }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0 0 1.3em; }
.prose li { margin-bottom: .5em; }
.prose li::marker { color: var(--brand); }

.lede {
  font-size: clamp(1.06rem, 1rem + .4vw, 1.22rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 62ch;
}

/* ------------------------------------------------------- article meta --- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-soft);
  padding: .34rem .68rem;
  border-radius: 100px;
  margin-bottom: 1.1rem;
}

.byline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .9rem;
  font-size: .88rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: .85rem 0;
  margin: 1.6rem 0 2rem;
}
.byline .author { color: var(--ink); font-weight: 650; }
.byline .sep { color: var(--line); }

/* ------------------------------------------------- disclosure blocks --- */

.disclosure-box {
  background: var(--warn-soft);
  border: 1px solid var(--warn-line);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  margin: 0 0 2rem;
  font-size: .93rem;
  line-height: 1.62;
  color: var(--ink-soft);
  max-width: var(--measure);
}
.disclosure-box h2,
.disclosure-box p:first-child strong { margin-top: 0; }
.disclosure-box .dh {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--warn);
  margin: 0 0 .5rem;
}
.disclosure-box p:last-child { margin-bottom: 0; }

.notice {
  border: 1px solid var(--line);
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 1.05rem 1.2rem;
  margin: 1.8rem 0;
  font-size: .93rem;
  color: var(--ink-soft);
  max-width: var(--measure);
}
.notice h3, .notice h2 { margin-top: 0; font-size: 1rem; }
.notice p:last-child { margin-bottom: 0; }

.notice-accent { border-color: var(--accent); background: var(--accent-soft); }

/* --------------------------------------------------------------- CTA --- */

.cta-block {
  margin: 2.2rem 0;
  max-width: var(--measure);
}
.cta-block.is-center { text-align: center; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  font: inherit;
  font-weight: 650;
  font-size: 1rem;
  line-height: 1.3;
  padding: .85rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover { background: var(--brand-dark); color: #fff; box-shadow: var(--shadow-lg); }
@media (prefers-color-scheme: dark) {
  .btn-primary { color: #14142e; }
  .btn-primary:hover { color: #14142e; }
}

.btn-outline {
  background: transparent;
  color: var(--brand);
  border-color: currentColor;
}
.btn-outline:hover { background: var(--brand-soft); }

.btn-full { display: flex; width: 100%; }

/* visible partner-link label, required on every commercial button */
.partner-tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .085em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px solid var(--line);
  background: var(--bg-alt);
  border-radius: 100px;
  padding: .16rem .55rem;
  margin-left: .55rem;
  vertical-align: middle;
  white-space: nowrap;
}
.btn .partner-tag {
  margin-left: 0;
  border-color: rgba(255, 255, 255, .45);
  background: rgba(255, 255, 255, .16);
  color: #fff;
}
.btn-outline .partner-tag {
  border-color: var(--line);
  background: transparent;
  color: var(--ink-faint);
}
@media (prefers-color-scheme: dark) {
  .btn-primary .partner-tag { border-color: rgba(20, 20, 46, .35); background: rgba(20, 20, 46, .16); color: #14142e; }
}

.cta-note {
  display: block;
  margin: .6rem 0 0;
  font-size: .82rem;
  line-height: 1.55;
  color: var(--ink-faint);
  max-width: 56ch;
}
.is-center .cta-note { margin-inline: auto; }

/* ------------------------------------------------------------ figures --- */

.figure {
  margin: 2.4rem 0;
  max-width: 100%;
}
.figure-media {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(.8rem, 2vw, 1.5rem);
  overflow-x: auto;
}
.figure-media svg { display: block; margin-inline: auto; width: 100%; height: auto; }
.figure figcaption {
  margin-top: .7rem;
  font-size: .85rem;
  line-height: 1.6;
  color: var(--ink-faint);
}
.figure figcaption b { color: var(--ink-soft); font-weight: 650; }

/* ------------------------------------------------------------- cards --- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.8rem 0 2.2rem;
}
.card {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
}
.card h3 { margin: 0 0 .4rem; font-size: 1.02rem; }
.card p { margin: 0; font-size: .92rem; color: var(--ink-soft); }

/* ------------------------------------------------------------- table --- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 1.8rem 0 .8rem;
}
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 540px;
  font-size: .92rem;
}
caption {
  caption-side: bottom;
  text-align: left;
  font-size: .82rem;
  color: var(--ink-faint);
  padding: .7rem .2rem 0;
}
th, td {
  text-align: left;
  padding: .72rem .95rem;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
thead th {
  background: var(--bg-sunk);
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }

/* --------------------------------------------------------------- FAQ --- */

.faq { margin: 1.6rem 0 2.4rem; max-width: var(--measure); }
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  margin-bottom: .6rem;
  overflow: hidden;
}
.faq summary {
  cursor: pointer;
  font-weight: 650;
  padding: .9rem 1.1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 1.3rem;
  line-height: 1;
  color: var(--brand);
  flex: none;
}
.faq details[open] summary::after { content: "\2212"; }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq .faq-a { padding: .95rem 1.1rem; margin: 0; font-size: .95rem; color: var(--ink-soft); }
.faq .faq-a p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------ aside --- */

.rail { display: grid; gap: 1.1rem; }
@media (min-width: 1001px) {
  .rail { position: sticky; top: 84px; }
}
.rail-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-alt);
  padding: 1.15rem 1.25rem;
}
.rail-box h2, .rail-box h3 {
  margin: 0 0 .7rem;
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 700;
}
.rail-box p { font-size: .9rem; color: var(--ink-soft); }
.rail-box ul { margin: 0; padding-left: 1.1rem; font-size: .92rem; }
.rail-box li { margin-bottom: .45rem; }
.rail-box li::marker { color: var(--brand); }

.toc { list-style: none; padding: 0 !important; margin: 0; }
.toc li { margin-bottom: .1rem; }
.toc a {
  display: block;
  padding: .36rem .5rem;
  border-radius: 7px;
  font-size: .9rem;
  color: var(--ink-soft);
  text-decoration: none;
  border-left: 2px solid var(--line);
}
.toc a:hover { background: var(--bg-sunk); color: var(--brand); border-left-color: var(--brand); }

.rail-cta { background: var(--brand-soft); border-color: color-mix(in srgb, var(--brand) 32%, transparent); }

/* ------------------------------------------------------------ footer --- */

.site-foot {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 2.6rem 0 2.2rem;
  font-size: .9rem;
  color: var(--ink-soft);
  margin-top: auto;
}
.foot-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.3fr) repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.8rem 2rem;
  padding-bottom: 1.8rem;
  border-bottom: 1px solid var(--line);
}
.foot-grid h2 {
  font-size: .76rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 .8rem;
  font-weight: 700;
}
.foot-grid ul { list-style: none; margin: 0; padding: 0; }
.foot-grid li { margin-bottom: .42rem; }
.foot-grid a { color: var(--ink-soft); text-decoration: none; }
.foot-grid a:hover { color: var(--brand); text-decoration: underline; }
.foot-id { font-style: normal; line-height: 1.72; font-size: .88rem; }
.foot-id .foot-name { color: var(--ink); font-weight: 650; display: block; }
.foot-bottom {
  padding-top: 1.5rem;
  display: grid;
  gap: .9rem;
  font-size: .82rem;
  color: var(--ink-faint);
  line-height: 1.65;
}
.foot-bottom p { margin: 0; }

/* ---------------------------------------------------------- 404 page --- */

.center-page {
  min-height: 62vh;
  display: grid;
  place-content: center;
  text-align: center;
  gap: .4rem;
  padding: 4rem 0;
}
.center-page .code {
  font-size: clamp(3.4rem, 10vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -.05em;
  color: var(--brand);
  line-height: 1;
  margin: 0;
}
.center-page .links { display: flex; flex-wrap: wrap; gap: .6rem; justify-content: center; margin-top: 1.4rem; }

/* --------------------------------------------------------- utilities --- */

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}
.muted { color: var(--ink-faint); }
.small { font-size: .87rem; }
.mt0 { margin-top: 0; }
.updated { font-size: .85rem; color: var(--ink-faint); margin-bottom: 1.8rem; }

@media print {
  .site-head, .site-nav, .disclosure-bar, .rail, .cta-block { display: none !important; }
  body { font-size: 12pt; }
}