:root {
  --bg: #0b0d12;
  --bg-elev: rgba(22, 26, 36, 0.72);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-border-strong: rgba(255, 255, 255, 0.16);
  --text: #e8ebf2;
  --muted: #8b93a7;
  --faint: #5b6378;
  --accent: #7c6cff;
  --accent-2: #22d3ee;
  --accent-soft: rgba(124, 108, 255, 0.14);
  --code-bg: #0d1017;
  --ok: #4ade80;
  --error: #f87171;
  --warn: #fbbf24;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);

  /* syntax */
  --tok-kw: #c792ea;
  --tok-str: #a5e075;
  --tok-num: #f78c6c;
  --tok-com: #5f6a85;
  --tok-bi: #82aaff;

  color-scheme: dark;
}

/* Light palette: used when the OS prefers light and the user hasn't forced
   dark, or when the user picked light. Keep both blocks in sync. */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f6fb;
    --bg-elev: rgba(255, 255, 255, 0.8);
    --panel-border: rgba(15, 23, 42, 0.08);
    --panel-border-strong: rgba(15, 23, 42, 0.18);
    --text: #111827;
    --muted: #5b6475;
    --faint: #9aa3b5;
    --accent: #5b4cf0;
    --accent-2: #0891b2;
    --accent-soft: rgba(91, 76, 240, 0.1);
    --code-bg: #fbfbfe;
    --ok: #15803d;
    --error: #dc2626;
    --warn: #b45309;
    --shadow: 0 20px 50px -24px rgba(15, 23, 42, 0.25);

    --tok-kw: #8b2fc9;
    --tok-str: #2f7d32;
    --tok-num: #c2410c;
    --tok-com: #8a94a8;
    --tok-bi: #1d4ed8;

    color-scheme: light;
  }
}

:root[data-theme="light"] {
  --bg: #f5f6fb;
  --bg-elev: rgba(255, 255, 255, 0.8);
  --panel-border: rgba(15, 23, 42, 0.08);
  --panel-border-strong: rgba(15, 23, 42, 0.18);
  --text: #111827;
  --muted: #5b6475;
  --faint: #9aa3b5;
  --accent: #5b4cf0;
  --accent-2: #0891b2;
  --accent-soft: rgba(91, 76, 240, 0.1);
  --code-bg: #fbfbfe;
  --ok: #15803d;
  --error: #dc2626;
  --warn: #b45309;
  --shadow: 0 20px 50px -24px rgba(15, 23, 42, 0.25);

  --tok-kw: #8b2fc9;
  --tok-str: #2f7d32;
  --tok-num: #c2410c;
  --tok-com: #8a94a8;
  --tok-bi: #1d4ed8;

  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; }

.glow {
  position: fixed;
  inset: -20vh -10vw auto;
  height: 70vh;
  background:
    radial-gradient(40% 50% at 30% 30%, rgba(124, 108, 255, 0.22), transparent 70%),
    radial-gradient(35% 45% at 75% 20%, rgba(34, 211, 238, 0.14), transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  z-index: -1;
}

/* --- nav ------------------------------------------------------------------ */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.gh-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--panel-border-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  backdrop-filter: blur(10px);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}
.gh-button:hover { border-color: var(--accent); transform: translateY(-1px); }
.nav-right { display: flex; align-items: center; gap: 10px; }
.theme-toggle {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  padding: 0;
  border: 1px solid var(--panel-border-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--text);
}
.theme-toggle:hover { border-color: var(--accent); }
/* Show the moon in light mode (click → dark), the sun in dark mode. */
.theme-toggle .sun { display: block; }
.theme-toggle .moon { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-toggle .sun { display: none; }
  :root:not([data-theme="dark"]) .theme-toggle .moon { display: block; }
}
:root[data-theme="light"] .theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .moon { display: block; }
.stars {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding-left: 8px;
  border-left: 1px solid var(--panel-border-strong);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.stars[hidden] { display: none; }

/* --- hero ----------------------------------------------------------------- */

.hero {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 24px 36px;
  text-align: center;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--panel-border-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
}
.badge .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 10px var(--ok);
}
.hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  font-weight: 800;
}
.grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  margin: 0 auto;
  max-width: 600px;
  color: var(--muted);
  font-size: 1.05rem;
}

/* --- app ------------------------------------------------------------------ */

.app {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 18px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  align-items: start;
}

.panel {
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  background: var(--bg-elev);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 16px;
  position: sticky;
  top: 16px;
}

.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 22px 14px;
  border: 1.5px dashed var(--panel-border-strong);
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop.has-file { border-style: solid; }
.drop-icon { color: var(--accent); margin-bottom: 6px; }
.drop-title { font-weight: 600; }
.drop-sub { color: var(--muted); font-size: 0.85rem; }
.file-info {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--muted);
  word-break: break-all;
}
.file-info:empty { display: none; }
.file-info strong { color: var(--text); }
.file-info .warn { color: var(--warn); }

.group-label {
  margin: 0 0 8px 2px;
  color: var(--faint);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.modes { display: grid; gap: 6px; }
.mode {
  display: block;
  cursor: pointer;
}
.mode input { position: absolute; opacity: 0; pointer-events: none; }
.mode span {
  display: flex;
  flex-direction: column;
  padding: 9px 12px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  transition: border-color 0.15s, background 0.15s;
}
.mode small, .toggle small { color: var(--muted); font-size: 0.78rem; line-height: 1.35; }
.mode:hover span { border-color: var(--panel-border-strong); }
.mode input:checked + span {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.mode input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.toggle {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  cursor: pointer;
}
.toggle input { position: absolute; opacity: 0; pointer-events: none; }
.toggle > span:last-child { display: flex; flex-direction: column; }
.switch {
  flex: none;
  position: relative;
  width: 36px; height: 20px;
  margin-top: 2px;
  border-radius: 999px;
  background: var(--panel-border-strong);
  transition: background 0.15s;
}
.switch::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s;
}
.toggle input:checked + .switch { background: var(--accent); }
.toggle input:checked + .switch::after { transform: translateX(16px); }
.toggle input:focus-visible + .switch { outline: 2px solid var(--accent); outline-offset: 2px; }

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

button {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.15s, border-color 0.15s, background 0.15s;
}
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled { opacity: 0.4; cursor: default; }
button.primary {
  flex: 1;
  padding: 10px 18px;
  border: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #4f6bff);
  box-shadow: 0 8px 24px -10px var(--accent);
}
button.primary:hover:not(:disabled) { filter: brightness(1.08); }
button.ghost {
  padding: 10px 16px;
  border: 1px solid var(--panel-border-strong);
  background: transparent;
  color: var(--text);
}
button.ghost:hover:not(:disabled) { border-color: var(--accent); }
button.small { padding: 5px 12px; font-size: 0.82rem; font-weight: 500; border-radius: 8px; }

/* --- result --------------------------------------------------------------- */

.result { overflow: hidden; min-width: 0; }

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px 10px 16px;
  border-bottom: 1px solid var(--panel-border);
}
.dots { display: flex; gap: 6px; margin-right: 6px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--panel-border-strong); }
.status { flex: 1; color: var(--muted); font-size: 0.85rem; min-width: 0; }
.status[data-kind="ok"] { color: var(--ok); }
.status[data-kind="error"] { color: var(--error); }
body.busy .status::before {
  content: "";
  display: inline-block;
  width: 10px; height: 10px;
  margin-right: 8px;
  border: 2px solid var(--accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: -1px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.code {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  min-height: 62vh;
  max-height: calc(100vh - 140px);
  overflow: auto;
  background: var(--code-bg);
  font: 13px/1.6 "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  /* Show operators as typed: no "<=" → "≤" ligatures. */
  font-variant-ligatures: none;
  tab-size: 4;
}
.code pre { margin: 0; padding: 14px 0; font: inherit; }
.gutter {
  position: sticky;
  left: 0;
  padding: 14px 12px 14px 16px !important;
  min-width: 3.5em;
  text-align: right;
  color: var(--faint);
  background: var(--code-bg);
  border-right: 1px solid var(--panel-border);
  user-select: none;
}
.gutter:empty { display: none; }
.output { padding: 14px 18px !important; white-space: pre; }
.output.error { color: var(--error); white-space: pre-wrap; }
.placeholder { color: var(--faint); }
body.busy .code { opacity: 0.5; transition: opacity 0.2s; }

.t-kw { color: var(--tok-kw); }
.t-str { color: var(--tok-str); }
.t-num { color: var(--tok-num); }
.t-com { color: var(--tok-com); font-style: italic; }
.t-bi { color: var(--tok-bi); }

/* --- features & footer ---------------------------------------------------- */

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  max-width: 1280px;
  margin: 56px auto 0;
  padding: 0 24px;
}
.feature {
  padding: 20px;
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  background: var(--bg-elev);
}
.f-icon {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
}
.feature h3 { margin: 14px 0 6px; font-size: 1rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.faq {
  max-width: 820px;
  margin: 64px auto 0;
  padding: 0 24px;
}
.faq h2 {
  margin: 0 0 18px;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  text-align: center;
}
.faq details {
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--bg-elev);
  margin-bottom: 10px;
}
.faq summary {
  padding: 14px 18px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-weight: 400; transition: transform 0.15s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0; padding: 0 18px 16px; color: var(--muted); }
.faq a { color: var(--accent); }
.faq code {
  font: 0.88em ui-monospace, "Cascadia Code", Consolas, monospace;
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--text);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  max-width: 1280px;
  margin: 48px auto 0;
  padding: 24px;
  border-top: 1px solid var(--panel-border);
  color: var(--muted);
  font-size: 0.85rem;
}
.footer .links { display: flex; gap: 18px; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--text); }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; padding: 0 16px; }
  .controls { position: static; }
  .code { min-height: 40vh; max-height: 75vh; }
  .features { grid-template-columns: 1fr; padding: 0 16px; margin-top: 36px; }
  .nav, .hero, .faq, .footer { padding-left: 16px; padding-right: 16px; }
  .faq { margin-top: 44px; }
  .hero { padding-top: 20px; }
}