:root {
  color-scheme: dark;
  --page-bg: #05070d;
  --panel-bg: #0a0f19;
  --card-bg: #111926;
  --card-active-bg: #182231;
  --input-bg: #121b2a;
  --input-active-bg: #182231;
  --border: #2c3749;
  --border-strong: rgba(246, 247, 251, 0.22);
  --text-primary: #f6f7fb;
  --text-secondary: #a7afbf;
  --text-muted-soft: #717b8d;
  --primary-red: #b30f24;
  --primary-red-hover: #cf1731;
  --red-rgb: 179, 15, 36;
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.24);
  --panel-shadow: 0 18px 48px rgba(0, 0, 0, 0.3);
  --soft-border: rgba(255, 255, 255, 0.085);
  --soft-border-strong: rgba(255, 255, 255, 0.16);
  --control-radius: 12px;
  --card-radius: 16px;
  --control-height: 50px;
  --field-gap: 14px;
  --section-gap: 18px;
  --display-font: "Arial Black", "Arial Narrow", Impact, ui-sans-serif, system-ui, sans-serif;
  --body-font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-family:
    var(--body-font);
  background: var(--page-bg);
  color: var(--text-primary);
  text-rendering: geometricPrecision;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 76% 4%, rgba(126, 155, 212, 0.11), transparent 25%),
    radial-gradient(circle at 16% 76%, rgba(var(--red-rgb), 0.08), transparent 29%),
    radial-gradient(circle at 54% 38%, rgba(18, 58, 42, 0.28), transparent 34%),
    var(--page-bg);
  scrollbar-color: var(--text-muted-soft) var(--panel-bg);
  scrollbar-width: thin;
}

button,
textarea {
  font: inherit;
}

button {
  border: 0;
}

.app-shell {
  position: relative;
  display: grid;
  gap: 14px;
  width: min(1180px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 12px 12px 116px;
  isolation: isolate;
}

.app-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 49% 22%, rgba(var(--red-rgb), 0.075), transparent 20rem),
    radial-gradient(circle at 80% 7%, rgba(126, 155, 212, 0.09), transparent 18rem),
    repeating-linear-gradient(18deg, rgba(255, 255, 255, 0.012) 0 2px, transparent 2px 16px);
  opacity: 0.86;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  min-height: 58px;
  padding: 8px 14px;
  border: 1px solid var(--soft-border);
  border-radius: 16px;
  background:
    radial-gradient(circle at 27% 54%, rgba(var(--red-rgb), 0.105), transparent 34%),
    linear-gradient(180deg, rgba(10, 15, 25, 0.93), rgba(10, 15, 25, 0.86)),
    var(--panel-bg);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  font-family: var(--display-font);
  font-size: 1.28rem;
  font-weight: 900;
  line-height: 1;
  text-decoration: none;
  text-transform: uppercase;
}

.brand img {
  display: block;
  width: auto;
  height: 38px;
  object-fit: contain;
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.26));
}

.workspace {
  display: grid;
  gap: 16px;
  align-items: start;
}

.editor-panel,
.preview-panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--soft-border);
  border-radius: 24px;
  background:
    radial-gradient(circle at 50% 0%, rgba(var(--red-rgb), 0.055), transparent 44%),
    linear-gradient(180deg, rgba(10, 15, 25, 0.94), rgba(10, 15, 25, 0.88)),
    var(--panel-bg);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(14px);
}

.editor-header,
.preview-header {
  display: grid;
  gap: 0;
  padding: 20px 18px 14px;
}

h2 {
  margin: 0;
  color: var(--text-primary);
  font-family: var(--display-font);
  font-size: 1.34rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

.bingo-form {
  display: grid;
  gap: var(--section-gap);
  padding: 0 18px 18px;
}

.field-grid {
  display: grid;
  gap: var(--field-gap);
}

.bingo-field {
  display: grid;
  gap: 6px;
  min-width: 0;
  color: var(--text-primary);
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.15;
}

.bingo-field__top {
  display: flex;
  align-items: baseline;
  justify-content: flex-end;
  gap: 12px;
  min-height: 1rem;
}

.bingo-field__count {
  color: var(--text-muted-soft);
  font-size: 0.68rem;
  font-weight: 760;
  letter-spacing: 0.02em;
}

.bingo-field textarea {
  width: 100%;
  min-height: 68px;
  padding: 12px 13px;
  resize: none;
  color: var(--text-primary);
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--control-radius);
  outline: none;
  font-size: 0.95rem;
  font-weight: 760;
  line-height: 1.22;
  overflow-wrap: anywhere;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.bingo-field textarea:focus {
  background: var(--input-active-bg);
  border-color: var(--border-strong);
  box-shadow: 0 0 0 4px rgba(var(--red-rgb), 0.12);
}

.bingo-field.has-error textarea {
  border-color: rgba(207, 23, 49, 0.82);
  box-shadow: 0 0 0 4px rgba(var(--red-rgb), 0.12);
}

.bingo-field__error {
  min-height: 0;
  color: #ff8d9e;
  font-size: 0.7rem;
  font-weight: 800;
}

.bingo-field.has-error .bingo-field__error {
  min-height: 0.88rem;
}

.form-actions {
  z-index: 2;
  display: grid;
  gap: 10px;
}

.mobile-download-button {
  position: fixed;
  right: 12px;
  bottom: 12px;
  left: 12px;
  z-index: 5;
  width: min(520px, calc(100% - 24px));
  margin-inline: auto;
  border-radius: 14px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.16),
    0 18px 48px rgba(var(--red-rgb), 0.28),
    0 12px 36px rgba(0, 0, 0, 0.38);
}

.form-actions .primary-button {
  display: none;
}

.primary-button,
.secondary-button {
  min-height: var(--control-height);
  padding: 0 16px;
  cursor: pointer;
  border-radius: var(--control-radius);
  font-family: var(--display-font);
  font-size: 0.92rem;
  font-weight: 900;
  letter-spacing: 0;
  transition:
    transform 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    opacity 180ms ease;
}

.primary-button:hover,
.secondary-button:hover {
  transform: scale(1.02);
}

.primary-button {
  color: #ffffff;
  background: var(--primary-red);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    0 14px 32px rgba(var(--red-rgb), 0.2);
}

.primary-button:hover {
  background: var(--primary-red-hover);
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.56;
  transform: none;
}

.secondary-button {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--soft-border);
}

.secondary-button:hover {
  background: rgba(255, 255, 255, 0.075);
  border-color: var(--soft-border-strong);
}

.preview-panel {
  display: grid;
  gap: 0;
  padding: 16px 0;
}

.bingo-card-preview {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 14px;
  width: min(100% - 32px, 440px);
  aspect-ratio: 1;
  margin: 0 auto;
  padding: 22px;
  overflow: hidden;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 18px;
  background:
    radial-gradient(circle at 28% 18%, rgba(var(--red-rgb), 0.22), transparent 32%),
    radial-gradient(circle at 84% 14%, rgba(126, 155, 212, 0.11), transparent 28%),
    repeating-linear-gradient(18deg, rgba(255, 255, 255, 0.018) 0 2px, transparent 2px 15px),
    linear-gradient(150deg, #111926, #070b12 58%, #05070d);
  box-shadow:
    0 26px 68px rgba(0, 0, 0, 0.36),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.bingo-card-preview::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.25) 100%);
}

.bingo-card-preview > * {
  position: relative;
  z-index: 1;
}

.preview-brand {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.preview-brand img {
  width: auto;
  height: 32px;
  object-fit: contain;
}

.preview-brand span {
  color: #ffffff;
  font-family: var(--display-font);
  font-size: clamp(1.2rem, 5vw, 1.8rem);
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(4, minmax(0, 1fr));
  gap: 8px;
  min-height: 0;
}

.preview-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  padding: 8px;
  overflow-wrap: break-word;
  word-break: normal;
  text-align: center;
  color: #ffffff;
  font-family: var(--display-font);
  font-size: clamp(0.62rem, 2.8vw, 0.84rem);
  font-weight: 900;
  line-height: 1.08;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0)),
    rgba(18, 27, 42, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 10px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

@media (min-width: 620px) {
  .app-shell {
    padding: 20px;
  }

  .field-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .form-actions {
    position: sticky;
    right: auto;
    bottom: 0;
    left: auto;
    grid-template-columns: 1.2fr 0.8fr;
    padding: 4px 0 0;
    background: linear-gradient(180deg, rgba(10, 15, 25, 0), rgba(10, 15, 25, 0.98) 26%);
  }

  .mobile-download-button {
    display: none;
  }

  .form-actions .primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: static;
    width: auto;
    margin-inline: 0;
    border-radius: var(--control-radius);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.14),
      0 14px 32px rgba(var(--red-rgb), 0.2);
  }
}

@media (min-width: 920px) {
  .app-shell {
    grid-template-rows: auto minmax(0, 1fr);
  }

  .workspace {
    grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.85fr);
    align-items: stretch;
  }

  .editor-panel,
  .preview-panel {
    min-height: calc(100vh - 112px);
  }

  .editor-panel {
    display: grid;
    grid-template-rows: auto 1fr;
  }

  .bingo-form {
    align-content: start;
    gap: 22px;
  }

  .field-grid {
    gap: 20px 24px;
  }

  .bingo-field {
    gap: 8px;
  }

  .bingo-field textarea {
    min-height: 92px;
    padding: 16px 18px;
    font-size: 1.08rem;
    line-height: 1.2;
  }

  .preview-panel {
    align-content: start;
  }

  .bingo-card-preview {
    width: min(100% - 32px, 540px);
  }
}