:root {
  --bg: #0a0b10;
  --bg-elev: rgba(22, 24, 33, 0.72);
  --bg-inset: rgba(8, 9, 14, 0.6);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #eceef5;
  --text-muted: #9197aa;
  --text-faint: #5d6275;
  --accent: #7c5cff;
  --accent-2: #22d3ee;

  --c-header: #fb7185;
  --c-payload: #c4b5fd;
  --c-signature: #22d3ee;
  --c-dot: #5d6275;

  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;

  --j-key: #93c5fd;
  --j-str: #86efac;
  --j-num: #fdba74;
  --j-bool: #f0abfc;
  --j-null: #9197aa;
  --j-punc: #6b7186;

  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 20px 50px -20px rgba(0, 0, 0, 0.6);
  --radius: 16px;
  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

:root[data-theme='light'] {
  --bg: #f6f7fb;
  --bg-elev: rgba(255, 255, 255, 0.8);
  --bg-inset: rgba(241, 243, 249, 0.9);
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.16);
  --text: #0f172a;
  --text-muted: #5b6478;
  --text-faint: #97a0b3;

  --c-header: #e11d48;
  --c-payload: #7c3aed;
  --c-signature: #0891b2;
  --c-dot: #97a0b3;

  --ok: #059669;
  --warn: #d97706;
  --err: #dc2626;

  --j-key: #2563eb;
  --j-str: #15803d;
  --j-num: #c2410c;
  --j-bool: #a21caf;
  --j-null: #64748b;
  --j-punc: #94a3b8;

  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 16px 40px -20px rgba(15, 23, 42, 0.18);
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}

button { font: inherit; color: inherit; cursor: pointer; }

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(600px 400px at 10% -5%, rgba(124, 92, 255, 0.22), transparent 70%),
    radial-gradient(500px 360px at 95% 10%, rgba(34, 211, 238, 0.14), transparent 70%),
    radial-gradient(700px 500px at 50% 110%, rgba(251, 113, 133, 0.08), transparent 70%);
}
.bg-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 70%);
  opacity: 0.5;
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.01em; }
.brand-mark {
  display: inline-flex; gap: 3px; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #5b3df5);
  box-shadow: 0 6px 20px -6px rgba(124, 92, 255, 0.7);
}
.brand-mark i { width: 5px; height: 5px; border-radius: 50%; }
.brand-mark i:nth-child(1) { background: #fda4af; }
.brand-mark i:nth-child(2) { background: #ede9fe; }
.brand-mark i:nth-child(3) { background: #67e8f9; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-muted);
  transition: color 0.15s, border-color 0.15s, background 0.15s, transform 0.1s;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
.icon-btn:active { transform: scale(0.96); }
.icon-btn.sm { width: 32px; height: 32px; border-radius: 8px; }
.icon-btn.copied { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }

.icon-moon { display: none; }
:root[data-theme='light'] .icon-sun { display: none; }
:root[data-theme='light'] .icon-moon { display: block; }

/* ---------- Layout ---------- */
.container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 8px 24px 48px;
  flex: 1;
}

.hero { text-align: center; margin: 24px auto 40px; max-width: 680px; }
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin: 0 0 16px;
  font-weight: 700;
}
.gradient-text {
  background: linear-gradient(90deg, var(--c-header), var(--accent) 50%, var(--c-signature));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p { color: var(--text-muted); margin: 0; font-size: 1.02rem; }
.hero p + p { margin-top: 12px; }

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

/* ---------- Cards ---------- */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.card-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.card-title {
  display: flex; align-items: center; gap: 9px;
  font-weight: 600; font-size: 0.9rem; letter-spacing: -0.005em;
}
.card-body { padding: 16px; }
.actions { display: flex; align-items: center; gap: 6px; }

.chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.chip:empty { display: none; }
.chip.danger { color: var(--err); border-color: color-mix(in srgb, var(--err) 35%, transparent); }

.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot.h { background: var(--c-header); box-shadow: 0 0 10px var(--c-header); }
.dot.p { background: var(--c-payload); box-shadow: 0 0 10px var(--c-payload); }
.dot.s { background: var(--c-signature); box-shadow: 0 0 10px var(--c-signature); }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 32px; padding: 0 12px;
  border-radius: 8px;
  font-size: 0.82rem; font-weight: 500;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--bg-inset); }

/* ---------- Editor ---------- */
.input-card { position: sticky; top: 20px; }

.editor {
  position: relative;
  margin: 16px;
  border-radius: 12px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.editor:focus-within {
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 16%, transparent);
}
.editor-highlight,
.editor-input {
  margin: 0;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  letter-spacing: 0;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
  tab-size: 2;
}
.editor-highlight {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  color: var(--text);
}
.editor-input {
  position: relative;
  display: block;
  width: 100%;
  min-height: 380px;
  resize: vertical;
  border: 0;
  outline: 0;
  background: transparent;
  color: transparent;
  caret-color: var(--text);
}
.editor-input::placeholder { color: var(--text-faint); }
.editor-input::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); color: transparent; }

.tk-h { color: var(--c-header); }
.tk-p { color: var(--c-payload); }
.tk-s { color: var(--c-signature); }
.tk-dot { color: var(--c-dot); }
.tk-extra { color: var(--err); text-decoration: wavy underline; }
.tk-prefix { color: var(--text-faint); }

.status {
  display: flex; align-items: center; gap: 10px;
  margin: 0 16px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.84rem;
  border: 1px solid var(--border);
  background: var(--bg-inset);
  color: var(--text-muted);
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-faint); flex: none; }
.status[data-state='ok'] { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 30%, transparent); background: color-mix(in srgb, var(--ok) 8%, transparent); }
.status[data-state='ok'] .status-dot { background: var(--ok); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 20%, transparent); }
.status[data-state='warn'] { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 30%, transparent); background: color-mix(in srgb, var(--warn) 8%, transparent); }
.status[data-state='warn'] .status-dot { background: var(--warn); box-shadow: 0 0 0 4px color-mix(in srgb, var(--warn) 20%, transparent); }
.status[data-state='err'] { color: var(--err); border-color: color-mix(in srgb, var(--err) 30%, transparent); background: color-mix(in srgb, var(--err) 8%, transparent); }
.status[data-state='err'] .status-dot { background: var(--err); box-shadow: 0 0 0 4px color-mix(in srgb, var(--err) 20%, transparent); }

.legend {
  display: flex; gap: 18px; flex-wrap: wrap;
  padding: 14px 16px 16px;
  font-size: 0.78rem; color: var(--text-muted);
}
.legend span { display: inline-flex; align-items: center; gap: 7px; }

/* ---------- Output ---------- */
.output { display: flex; flex-direction: column; gap: 20px; min-width: 0; }
.part { animation: rise 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) both; }
.part-payload { animation-delay: 0.04s; }
.part-signature { animation-delay: 0.08s; }
.part-header { border-top: 2px solid color-mix(in srgb, var(--c-header) 70%, transparent); }
.part-payload { border-top: 2px solid color-mix(in srgb, var(--c-payload) 70%, transparent); }
.part-signature { border-top: 2px solid color-mix(in srgb, var(--c-signature) 70%, transparent); }

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.seg {
  display: inline-flex;
  padding: 3px;
  border-radius: 9px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
}
.seg button {
  border: 0; background: transparent;
  font-size: 0.76rem; font-weight: 500;
  padding: 4px 10px; border-radius: 6px;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
}
.seg button:hover { color: var(--text); }
.seg button.active { background: var(--bg-elev); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25); }

/* JSON view */
.json {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.j-key { color: var(--j-key); }
.j-str { color: var(--j-str); }
.j-num { color: var(--j-num); }
.j-bool { color: var(--j-bool); }
.j-null { color: var(--j-null); font-style: italic; }
.j-punc { color: var(--j-punc); }
.j-time { border-bottom: 1px dashed currentColor; cursor: help; }
.j-comment { color: var(--text-faint); font-style: italic; }

/* Claims view */
.claims { display: flex; flex-direction: column; }
.claim {
  display: grid;
  grid-template-columns: minmax(96px, 150px) minmax(0, 1fr);
  gap: 16px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
}
.claim:first-child { padding-top: 2px; }
.claim:last-child { border-bottom: 0; padding-bottom: 2px; }
.claim-key { font-family: var(--font-mono); font-size: 0.82rem; color: var(--j-key); word-break: break-all; }
.claim-desc { display: block; font-family: var(--font-sans); font-size: 0.74rem; color: var(--text-faint); margin-top: 2px; }
.claim-val { font-family: var(--font-mono); font-size: 0.84rem; word-break: break-word; min-width: 0; }
.claim-val .sub { display: block; font-family: var(--font-sans); font-size: 0.78rem; color: var(--text-muted); margin-top: 3px; }
.claim-val .sub.bad { color: var(--err); }
.claim-val .sub.good { color: var(--ok); }
.claim-val .sub.pending { color: var(--warn); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 0.76rem; padding: 2px 8px; border-radius: 6px;
  background: var(--bg-inset); border: 1px solid var(--border);
}

.sig {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--c-signature);
  word-break: break-all;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
}
.sig:empty::before { content: '(empty)'; color: var(--text-faint); }
.note {
  display: flex; gap: 8px; align-items: flex-start;
  margin: 12px 0 0;
  font-size: 0.8rem; color: var(--text-muted);
}
.note svg { flex: none; margin-top: 3px; }

.error-box {
  font-size: 0.84rem;
  color: var(--err);
  padding: 12px 14px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--err) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--err) 30%, transparent);
}

/* Empty state */
.empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  min-height: 460px;
  padding: 40px 24px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-muted);
}
.empty h2 { margin: 20px 0 6px; font-size: 1.05rem; color: var(--text); font-weight: 600; letter-spacing: -0.01em; }
.empty p { margin: 0; font-size: 0.9rem; }
.empty-art { display: flex; gap: 8px; justify-content: center; }
.empty-art span {
  width: 14px; height: 14px; border-radius: 50%;
  animation: pulse 1.8s ease-in-out infinite;
}
.empty-art span:nth-child(1) { background: var(--c-header); }
.empty-art span:nth-child(2) { background: var(--c-payload); animation-delay: 0.2s; }
.empty-art span:nth-child(3) { background: var(--c-signature); animation-delay: 0.4s; }
@keyframes pulse {
  0%, 100% { transform: scale(0.7); opacity: 0.45; }
  50% { transform: scale(1); opacity: 1; }
}
.link {
  border: 0; background: none; padding: 0;
  color: var(--accent); font-weight: 500;
  text-decoration: underline; text-underline-offset: 3px;
}
:root:not([data-theme='light']) .link { color: #a998ff; }

/* Footer & toast */
.footer {
  text-align: center;
  padding: 24px;
  font-size: 0.78rem;
  color: var(--text-faint);
}

.toast {
  position: fixed;
  left: 50%; bottom: 28px;
  transform: translate(-50%, 16px);
  padding: 9px 16px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.84rem; font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .workspace { grid-template-columns: minmax(0, 1fr); }
  .input-card { position: static; }
  .editor-input { min-height: 220px; }
  .empty { min-height: 240px; }
}
@media (max-width: 520px) {
  .topbar, .container { padding-left: 16px; padding-right: 16px; }
  .hero { margin: 8px auto 28px; }
  .claim { grid-template-columns: minmax(0, 1fr); gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}