:root {
  --bg: #F3F3FA;
  --panel: #FFFFFF;
  --panel-2: #FBFBFE;
  --border: #E5E4F1;
  --border-strong: #D6D4E8;
  --text: #1A1830;
  --muted: #6E6B8A;
  --accent: #513EF7;
  --accent-strong: #3A29D4;
  --accent-ink: #FFFFFF;
  --accent-soft: rgba(81, 62, 247, .08);
  --accent-mid: rgba(81, 62, 247, .18);
  --ring: rgba(81, 62, 247, .28);
  --shadow-sm: 0 1px 2px rgba(26, 24, 48, .05);
  --shadow-lg: 0 20px 50px rgba(26, 24, 48, .14);
  --radius: 16px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1100px 500px at 12% -10%, rgba(81, 62, 247, .10), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent-mid); }

.wrap { max-width: 1180px; margin: 0 auto; padding: 56px 20px 96px; }

/* ---- header / brand ---- */
.brand { display: flex; align-items: center; gap: 18px; margin-bottom: 8px; }
.brand-logo { width: 100px; height: 100px; object-fit: contain; flex-shrink: 0; }
.brand-name {
  margin: 0;
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--muted);
}
.brand-cue {
  margin-top: 8px;
  padding-top: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -.005em;
}
.brand-cue-sub {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.82rem;
}
.brand-tagline {
  margin: -10px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  font-weight: 700;
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.lang-switcher { margin-inline-start: auto; align-self: center; }
.lang-switcher select {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--panel) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%236E6B8A' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 12px center;
  background-size: 10px 6px;
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 30px 6px 12px;
  border-radius: 8px;
  cursor: pointer;
}
[dir="rtl"] .lang-switcher select {
  background-position: left 12px center;
  padding: 6px 12px 6px 30px;
}

/* ---- card ---- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm), 0 14px 40px rgba(26, 24, 48, .07);
}

/* ---- toolbar ---- */
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.toolbar-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}
.btn-group {
  display: inline-flex;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}
.btn-group button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 7px 13px;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  border-radius: 7px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .14s, color .14s, box-shadow .14s;
}
.btn-group button:hover { color: var(--text); }
.btn-group button.active {
  background: var(--panel);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}
.btn-group button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.toolbar-hint { font-size: 0.8rem; color: var(--muted); white-space: nowrap; }
.split-status {
  flex: 0 0 100%;
  text-align: center;
  font-size: 0.8rem;
  color: var(--accent);
  font-style: italic;
  animation: hintPulse 1.2s ease-in-out infinite;
}
.toolbar-right { margin-inline-start: auto; display: flex; align-items: center; gap: 10px; }
.counter { font-size: 0.8rem; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.ghost-btn {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background .14s, border-color .14s, color .14s;
}
.ghost-btn:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.ghost-btn.done { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

.icon-group {
  display: inline-flex;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  overflow: hidden;
}
.icon-btn {
  appearance: none;
  border: 0;
  background: var(--panel);
  color: var(--text);
  padding: 6px 9px;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  transition: background .14s, color .14s;
}
.icon-btn + .icon-btn { border-inline-start: 1px solid var(--border); }
.icon-btn:hover:not(:disabled) { background: var(--accent-soft); color: var(--accent); }
.icon-btn:disabled { color: var(--border-strong); cursor: default; }
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ---- editor ---- */
.field { position: relative; }
#editor {
  min-height: 520px;
  max-height: 74vh;
  overflow-y: auto;
  padding: 20px;
  outline: none;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--text);
  caret-color: var(--accent);
  font-size: 1.02rem;
  line-height: 1.85;
}
#editor:empty::before {
  content: attr(data-placeholder);
  color: var(--muted);
}
#editor::-webkit-scrollbar { width: 10px; }
#editor::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 999px; border: 3px solid var(--panel); }

#editor .seg {
  cursor: pointer;
  border-radius: 5px;
  padding: 1px 1px;
  margin: 0 1px;
  background: var(--accent-soft);
  box-shadow: inset 0 -0.14em 0 var(--accent-mid);
  transition: background .12s, box-shadow .12s, color .12s;
}
#editor .seg:hover {
  background: var(--accent-mid);
  box-shadow: inset 0 -0.14em 0 var(--accent);
}
#editor .seg.open {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: none;
}
#editor .seg.flash { animation: flash .7s ease-out; }
@keyframes flash {
  0% { background: var(--accent); color: var(--accent-ink); box-shadow: none; }
  100% { background: var(--accent-soft); color: inherit; }
}

/* ---- statusbar ---- */
.statusbar {
  padding: 11px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
}
@keyframes hintPulse {
  0%, 100% { opacity: .55; }
  50% { opacity: 1; }
}

/* ---- popover ---- */
.popover {
  position: absolute;
  z-index: 30;
  width: 340px;
  max-width: calc(100vw - 32px);
  background: var(--panel-2);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  transform-origin: top left;
  animation: pop .14s ease-out;
}
[dir="rtl"] .popover { transform-origin: top right; }
.popover[hidden] { display: none; }
@keyframes pop {
  from { opacity: 0; transform: translateY(-5px) scale(.98); }
  to { opacity: 1; transform: none; }
}
.pop-arrow {
  position: absolute;
  top: -7px; left: 20px;
  width: 12px; height: 12px;
  background: var(--panel-2);
  border-left: 1px solid var(--border-strong);
  border-top: 1px solid var(--border-strong);
  transform: rotate(45deg);
  border-radius: 3px 0 0 0;
}
.pop-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 11px 12px 8px;
}
.pop-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 700;
  color: var(--muted);
}
.pop-close {
  appearance: none; border: 0; background: transparent;
  color: var(--muted); cursor: pointer;
  font-size: 1.15rem; line-height: 1; padding: 2px 4px; border-radius: 6px;
}
.pop-close:hover { color: var(--text); background: var(--border); }
.pop-original {
  margin: 0 12px 6px;
  padding: 6px 9px;
  background: var(--bg);
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--muted);
  max-height: 3.2em;
  overflow: hidden;
}
.popover ul { list-style: none; margin: 0; padding: 6px; }
.popover li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 0.92rem;
}
.popover li .arrow { margin-inline-start: auto; opacity: 0; font-size: 0.85rem; transition: opacity .12s; }
.popover li:hover,
.popover li.is-active { background: var(--accent); color: var(--accent-ink); }
.popover li:hover .arrow,
.popover li.is-active .arrow { opacity: .9; }
.popover li.pop-note,
.popover li.pop-error {
  cursor: default;
  font-size: 0.85rem;
  color: var(--muted);
}
.popover li.pop-note:hover,
.popover li.pop-error:hover { background: transparent; color: var(--muted); }
.popover li.pop-error { color: #b4232a; }
.popover li.pop-loading {
  color: var(--accent);
  font-style: italic;
  animation: hintPulse 1.2s ease-in-out infinite;
}
.pop-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px 11px;
  border-top: 1px solid var(--border);
}
.pop-more {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 7px;
  cursor: pointer;
}
.pop-more:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.pop-more:disabled { opacity: .5; cursor: default; }
.pop-more:disabled:hover { background: var(--panel); border-color: var(--border-strong); color: var(--text); }

@media (max-width: 560px) {
  .wrap { padding: 40px 14px 72px; }
  .brand { flex-wrap: wrap; }
  .lang-switcher { flex-basis: 100%; margin-inline-start: 0; margin-top: 10px; }
  .toolbar-label { display: none; }
  .btn-group { width: 100%; }
  .btn-group button { flex: 1; }
  .toolbar-right { width: 100%; justify-content: space-between; margin-inline-start: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .popover { animation: none; }
  #editor .seg.flash { animation: none; }
  * { transition-duration: .01ms !important; }
}