@font-face {
  font-family: "Braiins Sans";
  src: url("braiinssans-regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: block;
}

@font-face {
  font-family: "Braiins Sans";
  src: url("braiinssans-semibold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: block;
}

@font-face {
  font-family: "Braiins Sans";
  src: url("braiinssans-bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: block;
}

:root {
  --braiins-purple: #6b50ff;
  --braiins-black: #000000;
  --headings-color: #000000;
  --text-color: #6f6f6f;
  --button-primary-color: #6b50ff;
  --color-red-60: #d9222c;
  --color-green-60: #198038;
  --bg-input: #f3f3f6;
  --bg-subtle: #fafafa;
  --border-color-light: #ededed;
  --line-color: #ebebeb;
  --color-white: #ffffff;
  --gray-40: #aba8a6;
  --gray-60: #726e6c;
  --border-radius-button: 0px;
}

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

/* Archetyp „dokument“: rám roste s obsahem, roluje stránka manuálu.
   Žádné vh/svh/dvh, sticky ani vnitřní rolování. */
html,
body {
  margin: 0;
  padding: 0;
  background: transparent;
  color: var(--headings-color);
  font-family: "Braiins Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button,
input,
textarea {
  font: inherit;
}

.fields-group {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0;
}

.fields-group[hidden] {
  display: none;
}

.app {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(320px, 2fr);
  gap: 2rem;
  align-items: start;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0;
  padding-bottom: 1.5rem;
}

.panel {
  background: var(--color-white);
  border: 1px solid var(--border-color-light);
}

.panel-head {
  padding: 1rem 1.15rem 0.7rem;
  border-bottom: 1px solid var(--line-color);
}

.panel-head h2 {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--headings-color);
}

.panel-body {
  padding: 1rem 1.15rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-color);
}

.hint {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--gray-60);
}

input[type="text"] {
  width: 100%;
  height: 44px;
  padding: 0 0.75rem;
  border: 0;
  background: var(--bg-input);
  color: var(--headings-color);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--border-radius-button);
}

textarea {
  width: 100%;
  min-height: 88px;
  padding: 0.7rem 0.75rem;
  border: 0;
  background: var(--bg-input);
  color: var(--headings-color);
  line-height: 1.4;
  resize: vertical;
  border-radius: var(--border-radius-button);
}

input:focus,
textarea:focus {
  outline: 2px solid var(--button-primary-color);
  outline-offset: 2px;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--headings-color);
  cursor: pointer;
}

.check input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--button-primary-color);
}

input.is-error,
textarea.is-error {
  outline: 2px solid var(--color-red-60);
  outline-offset: 2px;
}

/* Výsledek rozboru: co nástroj ze vstupu vyčetl */
.result {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8125rem;
  line-height: 1.4;
}

.result:empty {
  display: none;
}

.result-isbn {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--headings-color);
}

.result-row {
  margin: 0;
  color: var(--text-color);
}

.result-row strong {
  font-weight: 600;
  color: var(--headings-color);
}

.result-note {
  margin: 0;
  padding-left: 1.1rem;
  position: relative;
  color: var(--gray-60);
}

.result-note::before {
  content: "";
  position: absolute;
  left: 0.2rem;
  top: 0.5em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--braiins-purple);
}

.result-note.is-error {
  color: var(--color-red-60);
  font-weight: 600;
}

.result-note.is-error::before {
  background: var(--color-red-60);
}

.result-note.is-ok::before {
  background: var(--color-green-60);
}

.seg {
  display: grid;
  grid-auto-rows: minmax(40px, auto);
  gap: 2px;
}

.seg--2 { grid-template-columns: repeat(2, 1fr); }

.seg button {
  appearance: none;
  margin: 0;
  padding: 0.7rem 0.45rem;
  border: 0;
  background: var(--bg-input);
  color: var(--gray-60);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.15;
  cursor: pointer;
  border-radius: var(--border-radius-button);
}

.seg button:hover {
  color: var(--headings-color);
}

.seg button.is-on {
  background: var(--braiins-black);
  color: var(--color-white);
}

.seg button:focus-visible {
  outline: 2px solid var(--button-primary-color);
  outline-offset: 2px;
  z-index: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2em;
  border: 1px solid transparent;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  border-radius: var(--border-radius-button);
}

.btn:focus-visible {
  outline: 2px solid var(--button-primary-color);
  outline-offset: 2px;
}

.btn-primary {
  color: var(--color-white);
  background: var(--button-primary-color);
  border-color: var(--button-primary-color);
}

.btn-primary:hover {
  filter: brightness(110%);
}

.btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
  filter: none;
}

.stage {
  min-width: 0;
}

/* Šedá plocha s náhledem; samotný štítek je bílý jako v exportu */
.stage-frame {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 3.5rem 2rem;
  background: var(--bg-subtle);
}

.stage-art {
  width: 100%;
  max-width: 560px;
}

.stage-art svg {
  display: block;
  width: 100%;
  height: auto;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.stage-art.is-qr {
  max-width: 360px;
}

/* Průhledné QR: šachovnice ukáže, kde pozadí není */
.stage-art.is-transparent svg {
  box-shadow: none;
  background-color: #ffffff;
  background-image:
    linear-gradient(45deg, #e9e9ee 25%, transparent 25%),
    linear-gradient(-45deg, #e9e9ee 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e9e9ee 75%),
    linear-gradient(-45deg, transparent 75%, #e9e9ee 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.stage-art.is-qr.is-empty {
  aspect-ratio: 1;
}

/* Bez platného čísla: prázdné pole v poměru štítku, ať náhled neposkočí */
.stage-art.is-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 116 / 60;
  border: 1px dashed var(--gray-40);
}

.stage-empty {
  margin: 0;
  padding: 1rem;
  font-size: 0.875rem;
  color: var(--gray-60);
  text-align: center;
}

.link-btn {
  padding: 0;
  border: 0;
  background: none;
  color: var(--button-primary-color);
  font: inherit;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

@media (max-width: 639.98px) {
  .app {
    grid-template-columns: 1fr;
  }

  .stage {
    order: -1;
  }

  .stage-frame {
    padding: 1.5rem 1rem;
  }
}