:root{
  --bg: #f7f9fc;
  --panel: #ffffff;
  --panel-2: #fbfcff;
  --text: #111827;
  --subtle: #6b7280;
  --accent: #0b5ed7;
  --accent-2: #4ea0ff;
  --border: #e5e7eb;
  --muted: #f3f4f6;
  --chip: #f8fafc;
  --shadow: 0 8px 24px rgba(15, 23, 42, .08);
  --radius: 16px;
  --code-font-size: 13px;
  --code-line-height: 1.5;

  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:
    radial-gradient(1200px 700px at 10% -10%, #ffffff, transparent 60%),
    var(--bg);
  color:var(--text);
  font-family:var(--sans);
  line-height:1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.topbar{
  position:sticky;
  top:0;
  z-index:10;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 18px;
  border-bottom:1px solid var(--border);
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(8px);
}
.brand{
  font-size:20px;
  font-weight:700;
  letter-spacing:.3px;
}
.brand span{color:var(--accent)}
.topbar-actions{
  display:flex;
  gap:10px;
  align-items:center;
  flex-wrap:wrap;
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--chip);
  font-size:12px;
  font-weight:700;
}
.badge.subtle{color:#0f172a}
.badge.neutral{color:var(--subtle)}
.badge.success{
  color:#0b7a3e;
  background:rgba(46, 204, 113, 0.10);
  border-color:rgba(46, 204, 113, 0.30);
}
.badge.error{
  color:#b42318;
  background:rgba(231, 76, 60, 0.10);
  border-color:rgba(231, 76, 60, 0.30);
}

.shell{
  max-width:1240px;
  margin:24px auto;
  padding:0 16px;
  display:grid;
  gap:20px;
}

.panel{
  background:
    radial-gradient(1000px 500px at -10% -10%, #eaf2ff 0%, transparent 50%),
    var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}

.intro{
  display:grid;
  grid-template-columns:minmax(0, 1.5fr) minmax(280px, 1fr);
  gap:20px;
  padding:24px;
}
.eyebrow{
  margin:0 0 8px;
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:.12em;
  font-size:12px;
  font-weight:800;
}
.intro h1{
  margin:0 0 10px;
  font-size:32px;
  line-height:1.15;
  color:#0f172a;
}
.lede{
  margin:0;
  max-width:70ch;
  color:#475467;
}
.intro-meta{
  display:grid;
  gap:12px;
}
.meta-card{
  padding:16px 18px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.84);
  border-radius:14px;
}
.meta-label{
  display:block;
  margin-bottom:4px;
  color:var(--subtle);
  font-size:12px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.08em;
}
.meta-card strong{
  font-size:16px;
  color:#0f172a;
}

.segmentor-panel .panel-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:20px;
  padding:18px 20px;
  border-bottom:1px solid var(--border);
}
.panel-title{
  flex:0 0 300px;
  min-width:0;
}
.panel-title h2{
  margin:0 0 4px;
  font-size:18px;
  color:#0f172a;
}
.status-line{
  margin:0;
  color:var(--subtle);
  font-size:13px;
}

.controls{
  display:flex;
  gap:10px;
  align-items:center;
  justify-content:flex-end;
  flex-wrap:wrap;
}
.counter-group{
  min-width:150px;
  padding:8px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
}
.threshold-group{
  min-width:220px;
  padding:8px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
}
.counter-label{
  display:block;
  color:var(--subtle);
  font-size:11px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.08em;
}
.counter-value{
  display:block;
  color:#0f172a;
  font-size:13px;
  font-weight:700;
  white-space:nowrap;
  font-variant-numeric:tabular-nums;
}
.threshold-controls{
  display:flex;
  align-items:center;
  gap:10px;
}
.threshold-range{
  flex:1;
  min-width:120px;
  accent-color:var(--accent);
}
.threshold-input{
  width:72px;
  padding:6px 8px;
  border:1px solid var(--border);
  border-radius:10px;
  background:var(--panel-2);
  color:var(--text);
  font:inherit;
  font-size:13px;
  font-weight:700;
}
.threshold-input:focus{
  outline:none;
  border-color:rgba(11,94,215,.45);
  box-shadow:0 0 0 3px rgba(11,94,215,.10);
}

.btn{
  background:#ffffff;
  border:1px solid var(--border);
  color:var(--text);
  padding:8px 12px;
  border-radius:12px;
  font-weight:600;
  cursor:pointer;
  box-shadow:0 1px 0 rgba(15,23,42,.03);
  transition:border-color .15s ease, box-shadow .15s ease, transform .02s ease;
}
.btn:hover{border-color:#d1d5db; box-shadow:0 2px 10px rgba(15,23,42,.06)}
.btn.primary{
  background:linear-gradient(180deg, var(--accent-2), var(--accent));
  color:#fff;
  border:none;
  box-shadow:0 6px 18px rgba(11,94,215,.25);
}
.btn:disabled{
  opacity:.6;
  cursor:not-allowed;
}
.btn:active{transform:translateY(1px)}

.body{
  display:grid;
  grid-template-columns:repeat(2, minmax(0, 1fr));
  gap:20px;
  padding:0 20px 24px;
}
.editor-pane,
.output-pane{
  min-width:0;
  display:flex;
  flex-direction:column;
}
.pane-label{
  display:block;
  margin:0 0 4px;
  color:#0f172a;
  font-size:13px;
  font-weight:700;
}
.code{
  flex:1 1 auto;
  width:100%;
  min-height:500px;
  border:1px solid var(--border);
  border-radius:14px;
  outline:none;
  resize:vertical;
  padding:16px;
  background:var(--panel-2);
  color:var(--text);
  font-family:var(--mono);
  font-size:var(--code-font-size);
  line-height:var(--code-line-height);
  tab-size:2;
}
.code:focus{
  border-color:rgba(11,94,215,.45);
  box-shadow:0 0 0 3px rgba(11,94,215,.10);
}
.input-hint{
  margin:10px 0 0;
  color:var(--subtle);
  font-size:12px;
}

.pane-head{
  display:flex;
  justify-content:space-between;
  gap:16px;
  align-items:flex-start;
  min-height:56px;
  padding-top:16px;
}
.result-meta{
  margin:0;
  color:var(--subtle);
  font-size:12px;
}

.legend{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  justify-content:flex-start;
  padding-top:12px;
}
.chip{
  display:flex;
  align-items:center;
  gap:8px;
  background:var(--chip);
  border:1px solid var(--border);
  padding:6px 10px;
  border-radius:999px;
  font-size:12px;
  color:#0f172a;
}
.dot{
  width:10px;
  height:10px;
  border-radius:50%;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.08);
  flex:0 0 auto;
}

.render{
  flex:1 1 auto;
  min-height:500px;
  overflow:auto;
  white-space:pre-wrap;
  font-family:var(--mono);
  font-size:var(--code-font-size);
  line-height:var(--code-line-height);
  tab-size:2;
  padding:16px;
  background:#fff;
  border:1px solid var(--border);
  border-radius:14px;
  overflow-wrap:normal;
  word-break:normal;
}
.render.empty{
  color:var(--subtle);
}

.stats{
  padding:14px 0 0;
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}
.stat{
  background:#fff;
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px 12px;
  display:flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  color:#0f172a;
}
.bar{
  height:8px;
  width:120px;
  background:#eef2f7;
  border-radius:8px;
  overflow:hidden;
  border:1px solid #e3e8ef;
}
.bar > i{
  display:block;
  height:100%;
}

.char{
  position:relative;
  cursor:pointer;
  display:inline;
  border-radius:3px;
  padding:0;
  margin:0;
  line-height:inherit;
  transition:background .12s ease, box-shadow .12s ease;
  --seg-color:#888888;
}
.char:hover,
.char:focus{
  outline:2px solid color-mix(in srgb, var(--seg-color) 38%, transparent);
  outline-offset:1px;
}
.char.newline{
  /* the literal "\n" inside renders as exactly one break via the
     container's white-space:pre-wrap — no <br>, no block box */
  display:inline;
}

.tooltip{
  display:none;
  position:fixed;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:8px 12px;
  font-family:var(--sans);
  font-size:14px;
  line-height:1.4;
  color:var(--text);
  box-shadow:var(--shadow);
  z-index:1000;
  pointer-events:none;
  max-width:260px;
}
.prob-bar{
  display:flex;
  align-items:center;
  margin:4px 0;
}
.prob-bar .label{
  flex:1;
  min-width:80px;
}
.prob-bar .bar{
  flex:2;
  height:8px;
  background:var(--muted);
  border-radius:4px;
  overflow:hidden;
  margin:0 8px;
}
.prob-bar .fill{
  height:100%;
  background:var(--color, var(--accent));
}

.footer{
  text-align:center;
  color:var(--subtle);
  font-size:12px;
  padding:24px 0 40px;
}

@media (max-width: 1120px){
  .intro{
    grid-template-columns:1fr;
  }
  .body{
    grid-template-columns:1fr;
  }
  .code,
  .render{
    min-height:360px;
  }
}

@media (max-width: 760px){
  .topbar{
    padding:14px 16px;
    align-items:flex-start;
    gap:12px;
    flex-direction:column;
  }
  .segmentor-panel .panel-head{
    flex-direction:column;
  }
  .panel-title{
    flex:0 0 auto;
  }
  .controls{
    justify-content:flex-start;
  }
  .threshold-group{
    width:100%;
  }
  .legend{
    justify-content:flex-start;
  }
}

/* ── Examples Section ── */
@property --gradient-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

@keyframes spin-gradient {
  to { --gradient-angle: 360deg; }
}

.examples-section {
  margin-top: 12px;
  text-align: center;
}

.examples-heading {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 6px 0;
  background: linear-gradient(135deg, var(--accent), #8b5cf6, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.examples-subtext {
  color: var(--subtle);
  font-size: 0.875rem;
  margin: 0 0 20px 0;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.example-card {
  position: relative;
  border-radius: 14px;
  padding: 2px;
  background: conic-gradient(
    from var(--gradient-angle),
    #0b5ed7 0%,
    #8b5cf6 25%,
    #ec4899 50%,
    #f59e0b 75%,
    #0b5ed7 100%
  );
  animation: spin-gradient 3s linear infinite;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.example-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.25);
}

.example-card-inner {
  background: var(--panel);
  border-radius: 12px;
  padding: 16px;
  height: 100%;
  text-align: left;
}

.example-card-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0 0 6px 0;
  color: var(--text);
}

.example-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.example-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--muted);
  color: var(--subtle);
}

.example-card-preview {
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.4;
  color: var(--subtle);
  white-space: pre-wrap;
  overflow: hidden;
  max-height: 72px;
  mask-image: linear-gradient(to bottom, black 50%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, black 50%, transparent 100%);
}