:root {
  --bg: #040712;
  --bg-soft: #07111f;
  --card: rgba(10, 18, 36, 0.9);
  --card-strong: rgba(14, 24, 48, 0.96);
  --text: #f7fbff;
  --muted: #9aabc7;
  --cyan: #22d3ee;
  --cyan-soft: rgba(34, 211, 238, 0.16);
  --purple: #a855f7;
  --purple-soft: rgba(168, 85, 247, 0.2);
  --green: #4ade80;
  --green-soft: rgba(74, 222, 128, 0.14);
  --yellow: #facc15;
  --red: #fb7185;
  --border: rgba(34, 211, 238, 0.26);
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.48);
  --radius: 18px;
  --mono: "Cascadia Code", "Fira Code", Consolas, monospace;
  --font:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --white-soft: rgba(247, 251, 255, 0.08);
  --white-border: rgba(247, 251, 255, 0.14);
  --ink: #02040a;
  --night-purple: #09051a;
  --cyan-border-soft: rgba(34, 211, 238, 0.22);
  --cyan-glow: rgba(34, 211, 238, 0.18);
  --panel-bg: rgba(2, 6, 18, 0.76);
  --panel-bg-strong: rgba(2, 6, 18, 0.94);
  --panel-bg-deep: rgba(2, 6, 18, 0.8);
  --panel-bg-orbit: rgba(2, 6, 18, 0.88);
  --body-purple-glow: rgba(168, 85, 247, 0.28);
  --body-cyan-glow: rgba(34, 211, 238, 0.2);
  --body-green-glow: rgba(74, 222, 128, 0.08);
  --red-border: rgba(251, 113, 133, 0.34);
  --red-soft: rgba(251, 113, 133, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 8% 0%, var(--body-purple-glow), transparent 30%),
    radial-gradient(circle at 92% 8%, var(--body-cyan-glow), transparent 28%),
    radial-gradient(
      circle at 50% 100%,
      var(--body-green-glow),
      transparent 35%
    ),
    linear-gradient(
      135deg,
      var(--ink) 0%,
      var(--bg) 50%,
      var(--night-purple) 100%
    );
  color: var(--text);
  font-family: var(--font);
}

button,
input,
textarea {
  font: inherit;
}

button {
  min-height: 46px;
  border: 1px solid var(--cyan-border-soft);
  border-radius: 12px;
  background: var(--card-strong);
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 0 14px 30px var(--cyan-glow);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--white-border);
  border-radius: 14px;
  outline: none;
  background: var(--panel-bg);
  color: var(--text);
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

input:focus,
textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
  background: var(--panel-bg-strong);
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  margin-bottom: 24px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  color: var(--green);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.hero-text {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.7;
}

.hero-badge {
  display: grid;
  place-items: center;
  width: clamp(140px, 22vw, 240px);
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 50%;
  background:
    linear-gradient(135deg, var(--cyan-soft), transparent 42%),
    linear-gradient(315deg, var(--purple-soft), var(--panel-bg-orbit));
  box-shadow: var(--shadow);
}

.hero-badge span,
.hero-badge strong {
  font-family: var(--mono);
  letter-spacing: 0.08em;
}

.hero-badge span {
  color: var(--cyan);
  font-size: 0.9rem;
}

.hero-badge strong {
  color: var(--text);
  font-size: clamp(2.4rem, 6vw, 4.8rem);
}

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

.input-card,
.convert-card {
  padding: 22px;
}

.input-topline,
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

h2 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: 0;
}

.format-tabs,
.button-cluster,
.toolbar,
.sample-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tab-btn {
  padding: 0 16px;
  color: var(--muted);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--cyan-soft), var(--purple-soft));
  color: var(--text);
  border-color: var(--cyan);
}

.source-input {
  min-height: 260px;
  padding: 18px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.65;
}

.sample-row {
  margin-top: 12px;
}

.toolbar {
  align-items: center;
  margin-top: 14px;
}

.toolbar-end {
  justify-content: flex-end;
}

.primary-btn,
.secondary-btn,
.danger-btn,
.ghost-btn,
.icon-btn,
.file-btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 12px;
}

.primary-btn {
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: var(--ink);
  border-color: transparent;
}

.secondary-btn {
  background: var(--cyan-soft);
}

.danger-btn {
  border-color: var(--red-border);
  background: var(--red-soft);
}

.ghost-btn,
.icon-btn {
  background: var(--white-soft);
}

.file-import input {
  display: none;
}

.file-btn {
  border: 1px solid var(--cyan-border-soft);
  background: var(--green-soft);
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.file-btn:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 0 14px 30px var(--cyan-glow);
}

.status-message {
  min-height: 24px;
  margin: 14px 0 0;
  color: var(--muted);
  font-weight: 700;
}

.status-message.success {
  color: var(--green);
}

.status-message.error {
  color: var(--red);
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.stat-pill {
  min-height: 82px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card-strong);
}

.stat-pill span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.stat-pill strong {
  display: block;
  margin-top: 8px;
  color: var(--text);
  font-size: 1.15rem;
}

.response-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 22px;
  margin-bottom: 22px;
}

.response-card {
  min-width: 0;
  padding: 20px;
}

.json-panel,
.tree-panel,
.converted-output {
  min-height: 430px;
  max-height: 620px;
  overflow: auto;
  margin: 0;
  padding: 18px;
  border: 1px solid var(--white-border);
  border-radius: 14px;
  background: var(--panel-bg-deep);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
}

.tree-panel {
  white-space: normal;
}

.converted-output {
  display: block;
  min-height: 260px;
  resize: vertical;
}

.tree-header {
  align-items: center;
}

.search-wrap {
  display: grid;
  min-width: min(260px, 100%);
  gap: 8px;
}

.search-wrap input {
  min-height: 42px;
  padding: 0 12px;
}

.search-wrap span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-align: right;
}

.empty-state {
  margin: 0;
  color: var(--muted);
  font-family: var(--font);
}

.tree-node {
  margin: 3px 0;
}

.tree-row {
  display: flex;
  min-height: 28px;
  align-items: center;
  gap: 7px;
  border-radius: 9px;
}

.tree-row:hover {
  background: var(--white-soft);
}

.toggle-btn {
  width: 24px;
  min-width: 24px;
  min-height: 24px;
  height: 24px;
  padding: 0;
  border-radius: 8px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.toggle-spacer {
  width: 24px;
  min-width: 24px;
}

.tree-children {
  margin-left: 26px;
  padding-left: 13px;
  border-left: 1px solid var(--border);
}

.tree-node.collapsed > .tree-children {
  display: none;
}

.key {
  color: var(--yellow);
  font-weight: 800;
}

.tag-name {
  color: var(--cyan);
  font-weight: 800;
}

.type-badge,
.attr-pill {
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--purple-soft);
  color: var(--purple);
  font-size: 0.72rem;
  font-weight: 900;
}

.attr-pill {
  color: var(--text);
}

.value-string {
  color: var(--cyan);
}

.value-number {
  color: var(--purple);
}

.value-boolean.true {
  color: var(--green);
}

.value-boolean.false,
.value-null {
  color: var(--red);
}

.value-text {
  color: var(--text);
}

.highlight {
  border-radius: 4px;
  background: var(--yellow);
  color: var(--ink);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 920px) {
  .hero,
  .response-layout {
    grid-template-columns: 1fr;
  }

  .hero-badge {
    justify-self: start;
  }

  .stats-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .input-topline,
  .card-header {
    flex-direction: column;
  }

  .search-wrap {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: min(100% - 24px, 1180px);
    padding: 28px 0;
  }

  .hero h1 {
    font-size: 3.2rem;
  }

  .hero-badge {
    width: 128px;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

  .toolbar > *,
  .sample-row > *,
  .button-cluster > *,
  .format-tabs > * {
    flex: 1 1 100%;
  }

  .json-panel,
  .tree-panel {
    min-height: 340px;
  }
}