:root {
  --bg: #0b0d11;
  --bg-elevated: #14171d;
  --bg-input: #0f1218;
  --border: #262b34;
  --border-strong: #39404c;
  --text: #e8ecf2;
  --text-muted: #9aa4b2;
  --text-faint: #6b7482;
  --accent: #5b8cff;
  --accent-hover: #7aa2ff;
  --accent-contrast: #071022;
  --danger: #ff6b6b;
  --warning: #ffc75a;
  --radius: 12px;
  --radius-sm: 8px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7f9;
    --bg-elevated: #ffffff;
    --bg-input: #ffffff;
    --border: #e0e4ea;
    --border-strong: #c4cbd6;
    --text: #14171d;
    --text-muted: #5a6472;
    --text-faint: #858e9c;
    --accent: #2f6bff;
    --accent-hover: #1d57e8;
    --accent-contrast: #ffffff;
    --danger: #c92a2a;
    --warning: #9a6700;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 32px 20px 48px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 1040px;
  margin: 0 auto;
}

/* ------------------------------ Masthead ------------------------------ */

.masthead h1 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 8px;
  font-size: 30px;
  letter-spacing: -0.02em;
}

.mark {
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: 6px;
  background-color: var(--accent);
  -webkit-mask: var(--mark-svg) center / contain no-repeat;
  mask: var(--mark-svg) center / contain no-repeat;
  --mark-svg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M2 2h4v4H2zM10 2h4v4h-4zM2 10h4v4H2zM7 2h1v1H7zM7 4h1v3H7zM2 7h3v1H2zM8 8h1v1H8zM10 7h1v1h-1zM12 8h2v1h-2zM7 12h1v2H7zM9 10h1v4H9zM11 11h3v1h-3zM12 13h2v1h-2z'/%3E%3C/svg%3E");
}

.tagline {
  margin: 0 0 18px;
  max-width: 62ch;
  color: var(--text-muted);
}

/* ------------------------------ Page tabs ------------------------------ */

.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
}

.tabs a {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
}

.tabs a:hover {
  border-color: var(--accent);
  color: var(--text);
}

.tabs a[aria-current="page"] {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  color: var(--text);
}

/* ------------------------------ Layout ------------------------------ */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  gap: 20px;
  align-items: start;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .preview {
    order: -1;
  }
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.preview {
  position: sticky;
  top: 20px;
}

@media (max-width: 860px) {
  .preview {
    position: static;
  }
}

/* ------------------------------ Fields ------------------------------ */

.field {
  padding-bottom: 22px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.field:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

label,
.label,
.sub-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: 8px;
}

.sub-label {
  color: var(--text-muted);
  font-weight: 500;
}

textarea,
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 11px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  font: inherit;
  resize: vertical;
}

textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  min-height: 62px;
}

textarea:focus-visible,
input:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.row-between {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.label-row {
  margin-top: 18px;
}

.label-row label {
  margin-bottom: 0;
}

.label {
  display: block;
}

.label.spaced {
  margin-top: 20px;
}

.link-btn {
  padding: 0;
  background: none;
  border: none;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent);
}

.link-btn:hover {
  text-decoration: underline;
}

.link-btn[disabled] {
  color: var(--text-faint);
  text-decoration: none;
}

.hint {
  margin: 8px 0 0;
  font-size: 12.5px;
  color: var(--text-faint);
}

.hint.center {
  text-align: center;
}

.counter {
  flex: none;
  font-variant-numeric: tabular-nums;
}

.error {
  margin: 6px 0 0;
  font-size: 12.5px;
  color: var(--danger);
}

.hidden {
  display: none !important;
}

/* ------------------------------ Colors ------------------------------ */

.color-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 420px) {
  .color-grid {
    grid-template-columns: 1fr;
  }
}

.color-input {
  display: flex;
  align-items: center;
  gap: 8px;
}

input[type="color"] {
  width: 42px;
  height: 42px;
  flex: none;
  padding: 0;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 3px;
}

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 5px;
}

input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 5px;
}

.hex {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  text-transform: lowercase;
  min-width: 0;
}

.hex[aria-invalid="true"] {
  border-color: var(--danger);
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px 0 0;
  font-weight: 500;
  cursor: pointer;
}

.checkbox input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.preset {
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  overflow: hidden;
  position: relative;
}

.preset::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    var(--preset-fg) 0 50%,
    var(--preset-bg) 50% 100%
  );
}

.preset:hover {
  border-color: var(--accent);
}

.notice {
  margin: 14px 0 0;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  border: 1px solid currentColor;
}

.notice.warn {
  color: var(--warning);
}

.notice.bad {
  color: var(--danger);
}

/* ------------------------------ Buttons ------------------------------ */

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.ghost-btn {
  margin-top: 12px;
  padding: 7px 11px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  color: var(--text-muted);
}

.ghost-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.segmented {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.segmented button {
  padding: 9px 0;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.segmented button:hover {
  border-color: var(--accent);
}

.segmented button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

/* The Wi-Fi security options need room for words, not single letters. */
.segmented-wide {
  grid-template-columns: 1.6fr 1fr 1fr;
}

.segmented-wide button {
  font-size: 12.5px;
  padding: 9px 4px;
}

/* ------------------------------ Payload readout ------------------------------ */

.payload {
  margin-top: 18px;
}

.payload code {
  display: block;
  margin-top: 6px;
  padding: 9px 11px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}

.advanced summary {
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 4px;
}

.slider-field {
  margin-top: 14px;
}

.slider-field label {
  color: var(--text-muted);
  font-weight: 500;
}

output {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

/* ------------------------------ Preview ------------------------------ */

.canvas-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* Checkerboard, shown only when the background is transparent. */
.canvas-wrap.is-transparent {
  background-image: linear-gradient(45deg, var(--border) 25%, transparent 25%),
    linear-gradient(-45deg, var(--border) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--border) 75%),
    linear-gradient(-45deg, transparent 75%, var(--border) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  max-width: 320px;
  border-radius: 4px;
  image-rendering: pixelated;
}

.error-box {
  margin: 14px 0 0;
  padding: 11px 12px;
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  color: var(--danger);
  font-size: 13px;
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 18px 0;
  padding: 0;
  text-align: center;
}

.meta div {
  padding: 8px 4px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.meta dt {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.meta dd {
  margin: 2px 0 0;
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.actions {
  display: grid;
  gap: 8px;
}

.primary-btn,
.secondary-btn {
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.primary-btn {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: var(--accent-contrast);
}

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

.secondary-btn {
  background: transparent;
  border: 1px solid var(--border-strong);
}

.secondary-btn:hover {
  border-color: var(--accent);
}

button[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ------------------------------ Footer ------------------------------ */

.footer {
  margin-top: 28px;
  text-align: center;
  font-size: 12.5px;
  color: var(--text-faint);
}

.footer p {
  margin: 0;
}