/*
 * Nibble — projektový web.
 * Tokeny i skladba stránky jsou schválně stejné jako u Gregory, aby oba
 * projekty působily jako jedna rodina. Liší se jen přízvučná barva.
 */

:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --ink: #1a2230;
  --muted: #5b6678;
  --line: #e4e8ef;
  --accent: #1f6f68;
  --accent-2: #3fa08a;
  --accent-ink: #ffffff;
  --code-bg: #0f1524;
  --code-ink: #d7e0f4;
  --chip: #eef2fb;
  --chip-ink: #3a4a6b;
  --shadow: 0 1px 2px rgb(20 30 50 / 5%), 0 8px 30px rgb(20 30 50 / 6%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1017;
    --panel: #161a24;
    --ink: #e8ecf4;
    --muted: #9aa6bd;
    --line: #252b39;
    --accent: #4fb3a4;
    --code-bg: #0a0e18;
    --code-ink: #cdd8f2;
    --chip: #1c2436;
    --chip-ink: #a7b6d6;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 10px 34px rgb(0 0 0 / 35%);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code,
pre,
kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

.wrap-wide {
  max-width: 1240px;
}

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

header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(8px);
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
}

.brand:hover {
  text-decoration: none;
}

.logo {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
}

.ver {
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  color: var(--accent);
  font: 600 11px/1 ui-monospace, monospace;
}

.nav .spacer {
  flex: 1;
}

.nav a.navlink {
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

.nav a.navlink:hover,
.nav a.navlink[aria-current] {
  color: var(--ink);
  text-decoration: none;
}

/* ----------------------------------------------------------------- hero */

.hero {
  padding: 72px 0 44px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.hero h1 .g {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lead {
  max-width: 660px;
  margin: 0 auto 14px;
  color: var(--muted);
  font-size: clamp(17px, 2.4vw, 21px);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 22px 0 30px;
}

.tag {
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--chip);
  color: var(--chip-ink);
  font-size: 13px;
  font-weight: 500;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  filter: brightness(1.06);
}

.btn-ghost {
  border-color: var(--line);
  background: var(--panel);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.btn-sm {
  padding: 7px 13px;
  font-size: 13px;
}

/* ----------------------------------------------------------------- code */

.codewrap {
  max-width: 720px;
  margin: 44px auto 0;
}

.code {
  overflow-x: auto;
  padding: 20px 22px;
  border-radius: 12px;
  background: var(--code-bg);
  color: var(--code-ink);
  font: 13.5px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-align: left;
  box-shadow: var(--shadow);
}

.code .c {
  color: #7f8db0;
}

.code .k {
  color: #c792ea;
}

.code .s {
  color: #c3e88d;
}

.code .t {
  color: #82aaff;
}

.code .n {
  color: #f5c77e;
}

.caption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

/* ------------------------------------------------------------- sections */

/* Jen sekce stránky — ne každý <section> na stránce, komponenty mají svoje. */
.wrap > section {
  padding: 52px 0;
}

h2 {
  margin: 0 0 8px;
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -0.01em;
}

.sub {
  margin: 0 0 30px;
  color: var(--muted);
  font-size: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.card .ic {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 9px;
  background: var(--chip);
  color: var(--accent);
}

.card h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.55;
}

.card code {
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--chip);
  color: var(--chip-ink);
  font-size: 13px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.chip {
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--chip);
  color: var(--chip-ink);
  font: 500 13px/1 ui-monospace, monospace;
}

.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 34px;
}

.two h3 {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

footer {
  border-top: 1px solid var(--line);
  padding: 34px 0;
  color: var(--muted);
  font-size: 14px;
}

.fnav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
}

.fnav .spacer {
  flex: 1;
}

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

.docs {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  padding: 40px 0 72px;
}

.toc {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  font-size: 14px;
}

.toc strong {
  display: block;
  margin: 18px 0 6px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc strong:first-child {
  margin-top: 0;
}

.toc a {
  display: block;
  padding: 3px 0;
  color: var(--muted);
}

.toc a:hover,
.toc a.active {
  color: var(--ink);
  text-decoration: none;
}

.prose h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 38px);
  letter-spacing: -0.02em;
}

.prose > p.lead {
  margin: 0 0 8px;
  text-align: left;
}

.prose h2 {
  margin: 48px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 24px;
}

.prose h3 {
  margin: 30px 0 8px;
  font-size: 17px;
}

.prose h3 code {
  font-size: 16px;
}

.prose p,
.prose li {
  font-size: 15.5px;
}

.prose :not(pre) > code {
  padding: 1.5px 5px;
  border-radius: 5px;
  background: var(--chip);
  color: var(--chip-ink);
  font-size: 13.5px;
}

.prose .code {
  margin: 14px 0;
}

.prose table {
  width: 100%;
  margin: 14px 0;
  border-collapse: collapse;
  font-size: 14px;
}

.prose th,
.prose td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.prose td:first-child {
  white-space: nowrap;
}

.table-wrap {
  overflow-x: auto;
}

.callout {
  margin: 18px 0;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: var(--panel);
  font-size: 14.5px;
}

/* Jen nadpis boxu je blok — `strong` uvnitř odstavce musí zůstat v řádku. */
.callout > strong:first-child {
  display: block;
  margin-bottom: 2px;
}

.callout p {
  margin: 0;
}

.sig {
  margin: 0 0 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
  font: 13.5px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
  overflow-x: auto;
}

.sig .t {
  color: var(--muted);
}

/* ----------------------------------------------------------------- demo */

.demo-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.panel {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel > h3 {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.panel + .panel {
  margin-top: 16px;
}

.field {
  display: block;
  margin-bottom: 14px;
  font-size: 13.5px;
}

.field > span {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
  font-size: 12.5px;
}

/* Český popis nese i název volby, aby vygenerovaný kód dával smysl. */
.field code,
.switch code {
  color: var(--muted);
  font-size: 11.5px;
}

/* Vysvětlivka pod popiskem pole. */
.field em {
  display: block;
  margin-top: 1px;
  color: var(--muted);
  font-size: 11.5px;
  font-style: normal;
  line-height: 1.35;
}

.panel-note {
  margin: -6px 0 16px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.45;
}

.field select,
.field input {
  width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
  color: inherit;
  font: inherit;
  font-size: 13.5px;
}

.switch {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 9px;
  font-size: 12.5px;
  line-height: 1.4;
  cursor: pointer;
}

.switch input {
  flex: 0 0 auto;
  margin-top: 1px;
}

/* Text i název volby musí být jedna flex položka, jinak se code odtrhne. */
.switch > span {
  flex: 1;
}

.switch input {
  accent-color: var(--accent);
}

.readout {
  display: grid;
  gap: 4px;
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 9px;
  background: var(--chip);
  color: var(--chip-ink);
  font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
  word-break: break-word;
}

.event-log {
  max-height: 150px;
  overflow-y: auto;
  margin: 0;
  padding: 0;
  list-style: none;
  font: 12.5px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.event-log li {
  padding: 2px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.event-log b {
  color: var(--accent);
  font-weight: 600;
}

.example {
  display: grid;
  gap: 10px;
}

.example > h3 {
  margin: 0;
  font-size: 15px;
}

/* ---------------------------------------------------------------- motivy */

/* Vzorek: pozadí motivu a v něm jeho tři signální barvy. */

@media (max-width: 900px) {
  .themes {
    grid-template-columns: minmax(0, 1fr);
  }
}

.example > p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
}

.two-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* Ukázka pickeru na neinputovém prvku. */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chip);
  color: var(--chip-ink);
  font-size: 14px;
  cursor: pointer;
}

.badge:hover,
.badge:focus-visible {
  border-color: var(--accent);
  outline: none;
}

@media (max-width: 900px) {
  .docs,
  .demo-grid,
  .two {
    grid-template-columns: minmax(0, 1fr);
  }

  .toc {
    position: static;
    max-height: none;
  }
}

/* ------------------------------------------------------------ editor */

/*
 * Editor na webu stojí v kartě, ale nesmí od ní dostat vlastní rámeček —
 * jeden rám uvnitř druhého vypadá jako chyba.
 */
.editor-stage {
  padding: 0;
  overflow: visible;
}

.editor-stage .nb {
  border: 0;
  border-radius: inherit;
}

.editor-note {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
}

/* Výstup getHTML() vedle editoru. Musí být poznat, že je to kód, ne text. */
.out {
  margin: 0;
  padding: 12px 14px;
  max-height: 320px;
  overflow: auto;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-ink);
  font-size: 12.5px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
}

.verdict-ok,
.verdict-bad {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}

.verdict-ok { background: #d9f0e4; color: #14543a; }
.verdict-bad { background: #fde4e1; color: #7a2620; }

@media (prefers-color-scheme: dark) {
  .verdict-ok { background: #14372a; color: #7fe0b0; }
  .verdict-bad { background: #3b1f1c; color: #ffa99e; }
}