/* ===========================================================================
   ChessM8 – strona wizytówkowa
   Tło i paleta zaczerpnięte z grafiki promocyjnej aplikacji (pobrane.png)
   Jeden akcent kolorystyczny (złoto), reszta w tonacji kremowo-brązowej.
   =========================================================================== */

:root {
  --deepest: #1b1008;
  --deep: #2b190d;
  --brown: #3d2513;

  --cream: #f7ead3;
  --cream-2: #dcc7a8;
  --muted: #a98f74;

  --gold: #e0b457;
  --gold-soft: rgba(224, 180, 87, 0.12);

  --line: rgba(247, 234, 211, 0.13);
  --line-strong: rgba(247, 234, 211, 0.26);
  --panel: rgba(43, 25, 13, 0.66);

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 20px 48px rgba(0, 0, 0, 0.42);

  --topbar-h: 66px;
  --shell: 1080px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --font: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* atrybut hidden musi wygrywać z display: flex/grid poniżej */
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100%;
  background: var(--deepest);
  color: var(--cream);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--cream); }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 6px;
}

.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;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--gold);
  color: #2a1808;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus { top: 0; color: #2a1808; }

/* --------------------------------------------------------------- tło strony */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(180deg, rgba(22, 12, 5, 0.86) 0%, rgba(22, 12, 5, 0.66) 45%, rgba(22, 12, 5, 0.92) 100%),
    url("../img/background.png");
  background-size: cover, cover;
  background-position: center, center 42%;
  background-repeat: no-repeat;
  transition: opacity 0.5s var(--ease), filter 0.5s var(--ease);
}

body[data-view="documents"] .bg-layer {
  opacity: 0.1;
  filter: blur(8px) saturate(0.5);
}

/* ------------------------------------------------------------ pasek górny */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 24px;
  background: rgba(20, 11, 5, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--cream);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--cream); }
.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

/* zakładki sekcji */
.tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-inline: auto;
}

.tabs a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--cream-2);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}
.tabs a:hover { background: rgba(247, 234, 211, 0.07); color: var(--cream); }
.tabs a.is-active {
  color: var(--gold);
  border-color: var(--line-strong);
  background: var(--gold-soft);
}

/* przełącznik języka */
.lang-switch { display: inline-flex; align-items: center; }

.lang-switch select {
  appearance: none;
  max-width: 9.5rem;
  padding: 8px 30px 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background-color: rgba(247, 234, 211, 0.05);
  background-image: linear-gradient(45deg, transparent 50%, var(--cream-2) 50%),
                    linear-gradient(135deg, var(--cream-2) 50%, transparent 50%);
  background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  color: var(--cream);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: background-color 0.18s, border-color 0.18s;
}
.lang-switch select:hover { background-color: rgba(247, 234, 211, 0.1); border-color: var(--cream-2); }
.lang-switch select option {
  background: #2b190d;
  color: var(--cream);
  font-weight: 500;
}

/* --------------------------------------------------------------- przyciski */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 650;
  font-size: 0.97rem;
  cursor: pointer;
  text-align: center;
  max-width: 100%;
  transition: background 0.18s, color 0.18s, border-color 0.18s, transform 0.16s var(--ease);
}
.btn svg { width: 19px; height: 19px; flex: none; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--gold);
  color: #2a1808;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
}
.btn-primary:hover { background: #edc470; color: #2a1808; }

.btn-lg { padding: 14px 30px; font-size: 1.02rem; }

/* ------------------------------------------------------------------ widoki */
main { position: relative; z-index: 1; }
.view { display: none; }
.view.is-visible { display: block; animation: view-in 0.42s var(--ease); }
/* animujemy wyłącznie przesunięcie – treść nigdy nie zostaje ukryta,
   nawet jeśli animacja nie zostanie wykonana (wydruk, tryb oszczędny) */
@keyframes view-in {
  from { transform: translateY(12px); }
  to { transform: none; }
}

/* -------------------------------------------------------------------- hero */
.view-main { padding-top: var(--topbar-h); }

.hero {
  /* na bardzo wysokich ekranach nie rozciągamy sekcji w nieskończoność */
  min-height: min(calc(86vh - var(--topbar-h)), 700px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 18px;
  padding: 72px 24px 64px;
}

.hero > * { max-width: 100%; }

.hero-tagline,
.hero-lead { text-shadow: 0 2px 12px rgba(0, 0, 0, 0.75); }

.hero-icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  border: 1px solid var(--line-strong);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.hero-title {
  margin: 6px 0 0;
  font-size: clamp(2.6rem, 7vw, 4.3rem);
  line-height: 1.03;
  font-weight: 800;
  letter-spacing: -0.035em;
  text-shadow: 0 6px 30px rgba(0, 0, 0, 0.6);
}

.hero-tagline {
  margin: 0;
  color: var(--gold);
  font-size: clamp(0.8rem, 1.9vw, 0.95rem);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero-lead {
  margin: 0;
  width: 100%;
  max-width: 620px;
  color: var(--cream-2);
  font-size: clamp(1rem, 2.2vw, 1.1rem);
}

.hero .btn { margin-top: 10px; }

/* ------------------------------------------------------------------ sekcje */
.section {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 72px 24px;
  border-top: 1px solid var(--line);
}

/* nagłówek sekcji jest pełnym zdaniem – czytamy go jak wprowadzenie */
.section > h2 {
  margin: 0 auto 36px;
  max-width: 46rem;
  font-size: clamp(1.12rem, 2.4vw, 1.45rem);
  font-weight: 650;
  line-height: 1.55;
  letter-spacing: -0.01em;
  text-align: center;
  color: var(--cream);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 16px;
}

.feature {
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(6px);
  transition: border-color 0.2s, background 0.2s;
}
.feature:hover { border-color: var(--line-strong); background: rgba(48, 28, 14, 0.72); }

.feature .glyph {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--gold-soft);
  color: var(--gold);
}
.feature .glyph svg { width: 24px; height: 24px; }

.feature h3 { margin: 0 0 6px; font-size: 1.05rem; font-weight: 700; }
.feature p { margin: 0; color: var(--cream-2); font-size: 0.93rem; }

/* domknięcie strony */
.closing {
  max-width: 660px;
  margin: 0 auto;
  text-align: center;
  display: grid;
  justify-items: center;
  gap: 14px;
}
.closing h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 750;
  letter-spacing: -0.02em;
}
.closing-text { margin: 0; color: var(--cream-2); font-size: 1rem; }
.closing-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 6px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.closing .btn { margin-top: 8px; }

/* --------------------------------------------------------------- dokumenty */
.view-docs { padding: calc(var(--topbar-h) + 44px) 24px 84px; }

.docs-shell { max-width: 1000px; margin: 0 auto; }

.docs-head { text-align: center; margin-bottom: 26px; }
.docs-head h1 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 4.6vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
}
.docs-head p { margin: 0 auto; max-width: 600px; color: var(--cream-2); }

.docs-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 26px 0 28px;
}
.doc-tab {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(247, 234, 211, 0.04);
  color: var(--cream-2);
  font: inherit;
  font-weight: 600;
  font-size: 0.93rem;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}
.doc-tab:hover { background: rgba(247, 234, 211, 0.1); color: var(--cream); }
.doc-tab.is-active {
  background: var(--gold-soft);
  border-color: var(--gold);
  color: var(--cream);
}
.doc-tab[disabled] { opacity: 0.4; cursor: not-allowed; }
.doc-tab .glyph { display: inline-flex; color: var(--gold); }
.doc-tab .glyph svg { width: 17px; height: 17px; }

.doc {
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(26, 15, 7, 0.88);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.doc-head {
  padding: 26px 30px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(18, 10, 5, 0.55);
}
.doc-head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.25rem, 3.2vw, 1.7rem);
  font-weight: 750;
  line-height: 1.3;
  letter-spacing: -0.015em;
}
.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
}
.doc-meta .meta-item { display: inline-flex; align-items: center; gap: 7px; }
.doc-meta a, .doc-meta button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(247, 234, 211, 0.05);
  color: var(--cream-2);
  font: inherit;
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, color 0.18s;
}
.doc-meta a:hover, .doc-meta button:hover { background: rgba(247, 234, 211, 0.12); color: var(--cream); }

.doc-body {
  padding: 30px 34px 44px;
  max-height: 74vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(247, 234, 211, 0.26) transparent;
}
.doc-body::-webkit-scrollbar { width: 10px; }
.doc-body::-webkit-scrollbar-thumb {
  background: rgba(247, 234, 211, 0.2);
  border-radius: 8px;
  border: 3px solid transparent;
  background-clip: content-box;
}

.doc-body h2 {
  margin: 34px 0 12px;
  font-size: 1.2rem;
  font-weight: 750;
  color: var(--cream);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.doc-body h2:first-child { margin-top: 0; }
.doc-body h3 { margin: 26px 0 10px; font-size: 1.03rem; font-weight: 700; color: var(--cream); }
.doc-body h4 { margin: 20px 0 8px; font-size: 0.97rem; color: var(--cream); }
.doc-body p { margin: 0 0 14px; color: var(--cream-2); font-size: 0.95rem; }
.doc-body ul, .doc-body ol { margin: 0 0 16px; padding-inline-start: 22px; color: var(--cream-2); font-size: 0.95rem; }
.doc-body li { margin-bottom: 8px; }
.doc-body li::marker { color: var(--gold); }
.doc-body strong { color: var(--cream); font-weight: 700; }
.doc-body a { text-decoration: underline; text-underline-offset: 2px; word-break: break-word; }
.doc-body hr { margin: 26px 0; border: 0; border-top: 1px solid var(--line); }
.doc-body code {
  font-family: "Cascadia Mono", "Consolas", monospace;
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 5px;
  background: rgba(247, 234, 211, 0.09);
}
.doc-body pre {
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(10, 5, 2, 0.6);
  color: var(--cream-2);
  font-family: "Cascadia Mono", "Consolas", monospace;
  font-size: 0.8rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 340px;
  overflow: auto;
}
.doc-body details.licence {
  margin: 10px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(247, 234, 211, 0.03);
  overflow: hidden;
}
.doc-body details.licence summary {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 650;
  font-size: 0.9rem;
  color: var(--cream);
  list-style: none;
}
.doc-body details.licence summary::-webkit-details-marker { display: none; }
.doc-body details.licence summary::before { content: "▸ "; color: var(--gold); }
.doc-body details.licence[open] summary { border-bottom: 1px solid var(--line); }
.doc-body details.licence[open] summary::before { content: "▾ "; }
.doc-body details.licence pre { border: 0; border-radius: 0; background: rgba(10, 5, 2, 0.5); max-height: 420px; }
.doc-body ul.source-list { font-size: 0.82rem; }
.doc-body ul.source-list li { margin-bottom: 4px; word-break: break-all; }

.doc-note {
  margin: 18px 30px 0;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: rgba(247, 234, 211, 0.06);
  color: var(--cream-2);
  font-size: 0.89rem;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.doc-note button {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(247, 234, 211, 0.08);
  color: var(--cream);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
}

.doc-loading {
  padding: 40px 34px;
  color: var(--muted);
  display: flex;
  gap: 14px;
  align-items: center;
}
.spinner {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid rgba(247, 234, 211, 0.22);
  border-top-color: var(--gold);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ------------------------------------------------------------------ stopka */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background: rgba(16, 9, 4, 0.92);
  padding: 30px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.86rem;
}
.footer a { color: var(--cream-2); }
.footer a:hover { color: var(--gold); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.footer .sep { opacity: 0.4; }

/* -------------------------------------------------------------------- wydruk */
@media print {
  .topbar, .bg-layer, .footer, .docs-tabs, .doc-meta, .doc-note, .skip-link { display: none !important; }
  body { background: #fff; color: #111; }
  .view:not(.is-visible) { display: none !important; }
  .view-docs { padding: 0; }
  .doc { border: 0; box-shadow: none; background: #fff; }
  .doc-head, .doc-body { border: 0; background: #fff; }
  .doc-body { max-height: none; overflow: visible; padding: 0 0 20px; }
  .doc-body p, .doc-body li, .doc-body h3, .doc-body h4, .doc-body strong { color: #111; }
  .doc-body h2 { color: #000; border-color: #ccc; }
}

/* ---------------------------------------------------------------- responsyw */
@media (max-width: 860px) {
  .section { padding: 56px 20px; }
  .hero { padding: 56px 20px 48px; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  :root { --topbar-h: 60px; }

  .topbar { gap: 12px; padding: 0 14px; }
  .brand-name { display: none; }
  .tabs { margin-inline: 0; }
  .tabs a { padding: 7px 11px; font-size: 0.88rem; }
  .lang-switch { margin-inline-start: auto; }
  .lang-switch select { max-width: 6.8rem; font-size: 0.85rem; padding: 7px 26px 7px 10px; }

  /* ciaśniejszy kadr tła – na wąskich ekranach pokazujemy szachownicę */
  .bg-layer { background-size: cover, 250% auto; background-position: center, center 52%; }

  .hero { min-height: auto; gap: 14px; padding: 44px 18px 44px; }
  .hero-icon { width: 78px; height: 78px; border-radius: 18px; }
  .hero .btn { width: 100%; }
  .closing .btn { width: 100%; }

  .section { padding: 46px 18px; }
  .section > h2 { margin-bottom: 26px; }
  .card-grid { gap: 12px; }
  .feature { padding: 22px 20px; }

  .view-docs { padding: calc(var(--topbar-h) + 28px) 16px 64px; }
  .doc-head { padding: 20px; }
  .doc-body { padding: 22px 20px 34px; max-height: none; }
  .doc-note { margin: 16px 20px 0; }
  .doc-tab { padding: 9px 14px; font-size: 0.88rem; }

  .footer { flex-direction: column; align-items: flex-start; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  html { scroll-behavior: auto; }
}