/* ─────────────────────────────────────────────────────────────
   LLM Watermarking Playground
   ───────────────────────────────────────────────────────────── */

:root {
  --bg: #f6f7f9;
  --bg-accent: radial-gradient(1200px 500px at 20% -10%, #dcfce7 0%, transparent 60%),
               radial-gradient(1000px 450px at 85% -10%, #fee2e2 0%, transparent 60%);
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --text: #16181d;
  --text-muted: #5b6472;
  --border: #e2e6eb;
  --green: #16a34a;
  --green-bg: #dcfce7;
  --green-border: #86efac;
  --red: #dc2626;
  --red-bg: #fee2e2;
  --red-border: #fca5a5;
  --accent: #16a34a;
  --accent-ink: #ffffff;
  --shadow: 0 1px 2px rgb(16 24 40 / 0.04), 0 8px 24px rgb(16 24 40 / 0.06);
  --radius: 14px;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Sora", var(--font-body);
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --bg-accent: radial-gradient(1200px 500px at 20% -10%, rgba(22, 163, 74, 0.16) 0%, transparent 60%),
                 radial-gradient(1000px 450px at 85% -10%, rgba(220, 38, 38, 0.14) 0%, transparent 60%);
    --surface: #171b22;
    --surface-2: #1f242d;
    --text: #e8eaee;
    --text-muted: #9aa3b0;
    --border: #2a303a;
    --green: #4ade80;
    --green-bg: rgba(34, 197, 94, 0.16);
    --green-border: rgba(74, 222, 128, 0.45);
    --red: #f87171;
    --red-bg: rgba(239, 68, 68, 0.16);
    --red-border: rgba(248, 113, 113, 0.45);
    --accent: #22c55e;
    --accent-ink: #06210f;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.4), 0 8px 24px rgb(0 0 0 / 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg-accent), var(--bg);
  background-attachment: fixed;
}

a { color: var(--green); text-underline-offset: 2px; }
em.g { color: var(--green); font-style: normal; font-weight: 600; }
em.r { color: var(--red); font-style: normal; font-weight: 600; }

/* ── Header ── */
.site-header { padding: 18px 20px 8px; }
.header-inner { max-width: 1440px; margin: 0 auto; }

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  padding: 4px 12px;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 6px 0;
}

.grad {
  background: linear-gradient(90deg, var(--green) 0%, #ca8a04 55%, var(--red) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle { max-width: 780px; color: var(--text-muted); margin: 0 0 8px; }

/* ── Layout ── */
.layout {
  max-width: 1440px;
  margin: 16px auto 0;
  padding: 0 20px 40px;
  display: grid;
  grid-template-columns: minmax(320px, 10fr) minmax(340px, 12fr) minmax(230px, 6fr);
  gap: 20px;
  align-items: start;
}
@media (max-width: 1180px) {
  .layout { grid-template-columns: minmax(320px, 5fr) minmax(340px, 6fr); }
  .detect-card { grid-column: 1 / -1; }
}
@media (max-width: 860px) { .layout { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

/* ── Fields ── */
.field { margin-bottom: 14px; }
.field > label, .param > label, legend {
  display: block;
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
}
.optional { font-weight: 400; color: var(--text-muted); }

textarea, input[type="text"], input[type="number"], select {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 9px 11px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
textarea { resize: vertical; min-height: 64px; }
textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 20%, transparent);
}
input:disabled { opacity: 0.45; cursor: not-allowed; }
[hidden] { display: none !important; }

.hint { font-size: 12.5px; color: var(--text-muted); margin: 6px 0 0; }

/* tooltip */
.tip {
  position: relative;
  display: inline-grid; place-items: center;
  width: 15px; height: 15px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 10.5px; font-weight: 600;
  cursor: help;
  vertical-align: 1px;
}
.tip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 7px); left: 50%;
  transform: translateX(-50%);
  width: max-content; max-width: 210px;
  padding: 6px 9px;
  border-radius: 7px;
  background: var(--text); color: var(--bg);
  font-weight: 400; font-size: 12px; line-height: 1.4;
  text-align: left; white-space: normal;
  opacity: 0; pointer-events: none;
  transition: opacity 0.12s;
  z-index: 20;
}
.tip:hover::after, .tip:focus-visible::after { opacity: 1; }
.seg-tip { margin-left: 8px; vertical-align: middle; }

.linklike {
  background: none; border: none; padding: 0; font: inherit;
  color: var(--green); text-decoration: underline; text-underline-offset: 2px; cursor: pointer;
}

/* segmented control */
.segmented { display: inline-flex; margin-top: 8px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 9px; padding: 3px; gap: 3px; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented span {
  display: inline-block; padding: 5px 14px; border-radius: 7px;
  font-size: 13px; font-weight: 500; color: var(--text-muted); cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.segmented input:checked + span { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgb(0 0 0 / 0.12); }

/* params */
.params { border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; margin: 0 0 12px; }
.params[open] { padding-bottom: 12px; }
.params summary {
  font-weight: 600; font-size: 13px;
  cursor: pointer; user-select: none;
  color: var(--text);
}
.params summary::marker { color: var(--text-muted); }
.params[open] summary { margin-bottom: 8px; }
.params .field { margin: 10px 0 0; }
.param-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 8px 10px; }
.param > label { margin-bottom: 3px; white-space: nowrap; }
.param input { padding: 6px 9px; font-size: 14px; }

/* model status */
.model-status { display: flex; align-items: center; gap: 8px; margin-top: 7px; font-size: 12.5px; color: var(--text-muted); }
.backend-badge {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  border: 1px solid var(--green-border); color: var(--green); background: var(--green-bg);
  padding: 1px 7px; border-radius: 999px;
}
.progress { height: 6px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin-top: 8px; }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--green), #4ade80); border-radius: 999px; transition: width 0.2s; }

/* ── Buttons ── */
.actions { display: flex; gap: 10px; }
.btn {
  font: inherit; font-weight: 600; font-size: 14px;
  border-radius: 10px; padding: 10px 20px; cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.06s, filter 0.15s, background 0.15s;
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--accent); color: var(--accent-ink); flex: 1; }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn.secondary { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn.secondary:hover:not(:disabled) { border-color: var(--green); }
.btn.ghost { background: transparent; color: var(--red); border-color: var(--red-border); }

/* ── Output ── */
.output-card, .detect-card { position: sticky; top: 16px; }
@media (max-width: 860px) { .output-card, .detect-card { position: static; } }

.output-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.output-head h2 { font-family: var(--font-display); font-size: 17px; margin: 0 0 12px; }

.legend { display: flex; gap: 14px; font-size: 12.5px; color: var(--text-muted); }
.legend-item { display: inline-flex; align-items: center; gap: 5px; }
.swatch { width: 12px; height: 12px; border-radius: 4px; display: inline-block; }
.swatch.green { background: var(--green-bg); border: 1px solid var(--green-border); }
.swatch.red { background: var(--red-bg); border: 1px solid var(--red-border); }

.output {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 2;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  min-height: 200px;
  max-height: calc(100vh - 210px);
  overflow-y: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.placeholder { color: var(--text-muted); font-family: var(--font-body); }
.prompt-echo { color: var(--text-muted); }

.tok {
  border-radius: 5px;
  padding: 1.5px 1px;
  border: 1px solid transparent;
}
.tok.green { background: var(--green-bg); border-color: var(--green-border); }
.tok.red { background: var(--red-bg); border-color: var(--red-border); }

.detect-key label {
  display: block;
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
}


.detect-key { margin-top: 0; }
.detect-row { margin-top: 14px; }
.detect-row .btn { width: 100%; }

/* ── Verdict ── */
.verdict {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  background: color-mix(in srgb, var(--surface-2) 60%, transparent);
}
.verdict-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin-bottom: 10px; }
.verdict-label { font-family: var(--font-display); font-weight: 700; font-size: 16px; }
.verdict-label.pos { color: var(--green); }
.verdict-label.mid { color: #ca8a04; }
.verdict-label.neg { color: var(--text-muted); }
.verdict-conf { font-size: 13px; color: var(--text-muted); }

.meter { height: 8px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); overflow: hidden; }
.meter-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #9ca3af, #ca8a04 55%, var(--green));
  transition: width 0.4s ease;
}

.stats { display: flex; flex-direction: column; gap: 6px; margin: 14px 0 0; }
.stats div { margin: 0; display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.stats dt { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); }
.stats dd { margin: 0; font-family: var(--font-mono); font-size: 14px; font-weight: 500; text-align: right; overflow-wrap: anywhere; }
#verdict-note { margin-top: 12px; }

/* ── status levels, notes & diagnostics ── */
.status-warn { color: #ca8a04; }
.status-error { color: var(--red); }
.status-note { font-size: 12.5px; color: var(--text-muted); margin: 6px 0 0; }
.diagnostics { margin-top: 8px; font-size: 12px; color: var(--text-muted); }
.diagnostics summary { cursor: pointer; user-select: none; font-weight: 600; }
.diagnostics .diag-actions { margin: 6px 0; }
.diagnostics pre {
  font-family: var(--font-mono); font-size: 11px; line-height: 1.45; color: var(--text);
  max-height: 260px; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px; margin: 0;
}
.btn.small { padding: 5px 12px; font-size: 12.5px; border-radius: 8px; }