/* ─── Theme tokens ─── */

:root {
  color-scheme: light dark;
  --accent: #d62976;
  --accent-2: #962fbf;
  --bg: #f6f7fb;
  --panel-bg: #ffffff;
  --panel-border: #e3e6ee;
  --text: #1f2430;
  --text-muted: #5b6474;
  --input-bg: #ffffff;
  --input-border: #c9cfdd;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
  --danger: #d13438;
  --success: #107c41;
  --checker-a: #ffffff;
  --checker-b: #e6e8ef;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12141c;
    --panel-bg: #1a1d28;
    --panel-border: #2a2f40;
    --text: #e6e9f2;
    --text-muted: #98a1b5;
    --input-bg: #12141c;
    --input-border: #3a4157;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --danger: #ff6b70;
    --success: #4ade80;
    --checker-a: #262b3a;
    --checker-b: #1a1d28;
  }
}

:root[data-theme="dark"] {
  --bg: #12141c;
  --panel-bg: #1a1d28;
  --panel-border: #2a2f40;
  --text: #e6e9f2;
  --text-muted: #98a1b5;
  --input-bg: #12141c;
  --input-border: #3a4157;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  --danger: #ff6b70;
  --success: #4ade80;
  --checker-a: #262b3a;
  --checker-b: #1a1d28;
}

/* ─── Base ─── */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Arial, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.5;
}

a {
  color: var(--accent);
}

main {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 16px 24px;
}

/* ─── Header ─── */

#header-bar {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px 16px 8px;
}

.site-title-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

#header-bar h1 {
  margin: 0;
  font-size: 1.45rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-logo {
  display: inline-block;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background:
    radial-gradient(circle at 30% 70%, #fa7e1e 0%, #d62976 55%, #962fbf 100%);
  position: relative;
}

.site-logo::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 2.5px solid #fff;
  border-radius: 4px;
}

.tagline {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.version-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  color: var(--text-muted);
  text-decoration: none;
}

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

/* ─── Layout ─── */

#playground {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(320px, 480px);
  gap: 16px;
  align-items: start;
  margin-top: 12px;
}

@media (max-width: 860px) {
  #playground {
    grid-template-columns: 1fr;
  }

  .preview-column {
    order: -1;
  }
}

.controls-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.preview-column {
  position: sticky;
  top: 12px;
  min-width: 0;
}

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

/* ─── Panels ─── */

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

details.panel summary {
  cursor: pointer;
  font-weight: 600;
  user-select: none;
  margin: -2px 0 2px;
}

details.panel[open] summary {
  margin-bottom: 10px;
}

.panel__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px 16px;
}

/* ─── Fields ─── */

/* Author display rules (e.g. .field { display: flex }) override the UA
   stylesheet's [hidden] { display: none }; restore the attribute's meaning. */
[hidden] {
  display: none !important;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.field__label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.field--inline {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.field--checkbox {
  cursor: pointer;
}

.field--disabled {
  opacity: 0.45;
}

.field__hint {
  margin: 10px 0 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

textarea,
select,
input[type="url"],
input[type="file"] {
  font: inherit;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 7px 10px;
  max-width: 100%;
}

textarea {
  resize: vertical;
  min-height: 60px;
}

textarea:focus-visible,
select:focus-visible,
input:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

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

input[type="color"] {
  inline-size: 44px;
  block-size: 30px;
  padding: 2px;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  background: var(--input-bg);
  cursor: pointer;
}

input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

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

/* ─── Gradient list ─── */

#gradient-panel {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px 16px;
}

.gradient-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 2px 0 6px;
}

.gradient-color-row {
  display: flex;
  align-items: center;
  gap: 2px;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 3px;
}

.small-btn {
  font: inherit;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
  align-self: flex-start;
}

.small-btn:hover:not(:disabled) {
  color: var(--accent);
  border-color: var(--accent);
}

.small-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.gradient-color-row__remove {
  border: none;
  padding: 2px 5px;
}

/* ─── Preview ─── */

.preview-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview-frame {
  display: grid;
  place-items: center;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  min-height: 280px;
  padding: 12px;
  background-image:
    linear-gradient(45deg, var(--checker-b) 25%, transparent 25%, transparent 75%, var(--checker-b) 75%),
    linear-gradient(45deg, var(--checker-b) 25%, transparent 25%, transparent 75%, var(--checker-b) 75%);
  background-color: var(--checker-a);
  background-size: 20px 20px;
  background-position: 0 0, 10px 10px;
}

#qr-preview {
  max-width: 100%;
  max-height: min(70vh, 560px);
  height: auto;
  image-rendering: -webkit-optimize-contrast;
}

.qr-stats {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-height: 1.2em;
}

.generate-error {
  color: var(--danger);
  font-size: 0.85rem;
  border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent);
  border-radius: 8px;
  padding: 8px 10px;
}

.preview-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.action-btn {
  font: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
}

.action-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.action-btn--primary {
  background: linear-gradient(135deg, #fa7e1e, #d62976 55%, #962fbf);
  border: none;
  color: #fff;
}

.action-btn--primary:hover:not(:disabled) {
  color: #fff;
  filter: brightness(1.08);
}

.action-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.notification {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ─── Benchmark ─── */

.bench-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

#bench-progress {
  width: 100%;
  height: 8px;
  margin-top: 10px;
  accent-color: var(--accent);
}

#bench-result {
  margin-top: 6px;
}

/* ─── Toasts ─── */

.toast-stack {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(560px, calc(100vw - 24px));
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 10px 12px;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  font-size: 0.88rem;
}

.toast--show {
  opacity: 1;
  transform: translateY(0);
}

.toast--out {
  opacity: 0;
  transform: translateY(-6px);
}

.toast--error {
  border-left-color: var(--danger);
}

.toast--success {
  border-left-color: var(--success);
}

.toast__body {
  flex: 1;
  overflow-wrap: anywhere;
}

.toast__dismiss {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0 2px;
}

/* ─── About & footer ─── */

.playground-about,
footer {
  max-width: 1160px;
  margin: 0 auto;
  padding: 8px 16px;
}

.playground-about h2 {
  font-size: 1.05rem;
  margin: 8px 0;
}

.playground-about__body {
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer {
  padding-bottom: 28px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-copy-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  border-top: 1px solid var(--panel-border);
  padding-top: 14px;
}

.repo-mark {
  color: var(--text-muted);
  display: inline-flex;
}

.repo-mark:hover {
  color: var(--accent);
}

.repo-mark__icon {
  width: 20px;
  height: 20px;
}

.footer-copy-sep {
  opacity: 0.5;
}

/* ─── Theme cycle button ─── */

.toolbar-icon-btn {
  background: none;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 5px 7px;
  display: inline-flex;
  align-items: center;
}

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

.theme-cycle-btn__svg {
  display: none;
}

.theme-cycle-btn[data-theme-mode="system"] .theme-cycle-btn__svg--system,
.theme-cycle-btn[data-theme-mode="light"] .theme-cycle-btn__svg--light,
.theme-cycle-btn[data-theme-mode="dark"] .theme-cycle-btn__svg--dark {
  display: block;
}