:root {
  --bg: #f4f7fb;
  --bg-deep: #dde8f5;
  --surface: rgba(255, 255, 255, 0.84);
  --surface-strong: #ffffff;
  --surface-soft: rgba(246, 249, 253, 0.9);
  --border: rgba(72, 101, 129, 0.15);
  --text: #17212b;
  --muted: #647487;
  --accent: #de6b48;
  --accent-deep: #b75030;
  --success: #197a57;
  --error: #c24b40;
  --info: #245c90;
  --shadow: 0 24px 60px rgba(40, 68, 98, 0.12);
  --string: #b2533c;
  --number: #0c7a7a;
  --boolean: #6e52d9;
  --null: #9c7a12;
  --key: #2d5f97;
}

body[data-theme="dark"] {
  --bg: #111723;
  --bg-deep: #080d15;
  --surface: rgba(14, 22, 34, 0.82);
  --surface-strong: #0f1725;
  --surface-soft: rgba(18, 28, 42, 0.85);
  --border: rgba(140, 172, 208, 0.16);
  --text: #ecf3ff;
  --muted: #9ba8bd;
  --accent: #ff8456;
  --accent-deep: #db5e2b;
  --success: #56d39a;
  --error: #ff8675;
  --info: #8cc6ff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  --string: #ff9a73;
  --number: #74d6d6;
  --boolean: #b494ff;
  --null: #f0c45b;
  --key: #8cc6ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.96), transparent 34%),
    radial-gradient(circle at 18% 10%, rgba(238, 146, 105, 0.14), transparent 26%),
    radial-gradient(circle at 88% 78%, rgba(106, 159, 210, 0.16), transparent 24%),
    linear-gradient(145deg, #f7fafe 0%, var(--bg) 46%, var(--bg-deep) 100%);
  overflow-x: hidden;
  transition: background-color 180ms ease, color 180ms ease;
}

button,
textarea,
input {
  font: inherit;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--text);
  font-size: 1.1rem;
}

.background-glow {
  position: fixed;
  width: 28rem;
  height: 28rem;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.32;
  pointer-events: none;
}

.background-glow-left {
  top: -8rem;
  left: -8rem;
  background: rgba(229, 124, 86, 0.28);
}

.background-glow-right {
  right: -10rem;
  bottom: -8rem;
  background: rgba(92, 150, 214, 0.24);
}

.app-shell {
  position: relative;
  z-index: 1;
  max-width: 1320px;
  margin: 0 auto;
  padding: 42px 20px 64px;
}

.hero {
  margin-bottom: 28px;
}

.hero-topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.hero-copy {
  margin: 16px 0 0;
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(0, 1.04fr);
  gap: 20px;
  align-items: stretch;
}

.panel {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 640px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  min-width: 0;
  z-index: 0;
  transition:
    opacity 260ms ease,
    transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
    filter 260ms ease,
    min-height 220ms ease,
    padding 260ms ease,
    border-width 260ms ease;
}

.workspace[data-focus="input"] {
  grid-template-columns: minmax(0, 1fr) 64px;
}

.workspace[data-focus="output"] {
  grid-template-columns: 64px minmax(0, 1fr);
}

.workspace[data-focus="input"] .panel-output,
.workspace[data-focus="output"] .panel-input {
  opacity: 0.58;
  overflow: hidden;
  min-height: 720px;
  padding: 18px 10px;
  transform: translateX(0);
  filter: saturate(0.75);
  pointer-events: none;
  z-index: 0;
}

.workspace[data-focus="input"] .panel-input,
.workspace[data-focus="output"] .panel-output {
  opacity: 1;
  pointer-events: auto;
  transform: none;
  filter: none;
  z-index: 2;
}

.workspace[data-focus="input"] .panel-input,
.workspace[data-focus="output"] .panel-output {
  min-height: 720px;
}

.workspace[data-focus="input"] .panel-output {
  transform: translateX(18px);
}

.workspace[data-focus="output"] .panel-input {
  transform: translateX(-18px);
}

.workspace[data-focus="input"] .panel-output > :not(.panel-rail-toggle),
.workspace[data-focus="output"] .panel-input > :not(.panel-rail-toggle) {
  opacity: 0;
  pointer-events: none;
}

.workspace[data-focus="input"] .panel-input .panel-rail-toggle,
.workspace[data-focus="output"] .panel-output .panel-rail-toggle {
  opacity: 0;
  pointer-events: none;
}

.workspace[data-focus="input"] .panel-output .panel-rail-toggle,
.workspace[data-focus="output"] .panel-input .panel-rail-toggle {
  opacity: 1;
  pointer-events: auto !important;
}

.panel-rail-toggle {
  position: absolute;
  inset: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: calc(100% - 20px);
  height: calc(100% - 20px);
  padding: 16px 8px;
  border-radius: 18px;
  border: 1px dashed var(--border);
  background:
    linear-gradient(180deg, rgba(191, 90, 54, 0.1), rgba(35, 78, 123, 0.08)),
    var(--surface-soft);
  color: var(--text);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition:
    opacity 220ms ease,
    transform 220ms ease,
    background-color 220ms ease,
    border-color 220ms ease;
}

.rail-arrow {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0;
}

.rail-text {
  font-size: 0.78rem;
  font-weight: 700;
}

.panel-rail-toggle:hover {
  transform: translateY(-1px);
}

.keyboard-hint {
  position: absolute;
  top: 78px;
  left: 50%;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: max-content;
  max-width: calc(100% - 44px);
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 252, 247, 0.84);
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(76, 49, 20, 0.1);
  color: var(--muted);
  font-size: 0.82rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none !important;
  transform: translateX(-50%) translateY(-8px);
  transition:
    opacity 180ms ease,
    transform 220ms ease;
}

.keyboard-hint,
.keyboard-hint * {
  pointer-events: none !important;
}

.keyboard-hint-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: rgba(191, 90, 54, 0.12);
  color: var(--accent-deep);
  font-size: 0.82rem;
  line-height: 1;
}

body[data-theme="dark"] .keyboard-hint {
  background: rgba(15, 23, 37, 0.82);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.24);
}

body[data-theme="dark"] .keyboard-hint-icon {
  background: rgba(255, 132, 86, 0.14);
  color: var(--accent);
}

body[data-theme="dark"] .secondary-action-group {
  background: rgba(18, 28, 42, 0.78);
}

.keyboard-hint.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.panel-header,
.meta-bar,
.tree-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.panel-header {
  margin-bottom: 16px;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.panel-header p {
  margin: 6px 0 0;
  font-size: 0.94rem;
  color: var(--muted);
}

.field-label,
.meta-label {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.mode-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.mode-label {
  margin-bottom: 0;
}

.mode-group {
  flex-shrink: 0;
}

.json-input,
.output-shell,
.tree-container {
  width: 100%;
  margin: 0;
  border: 1px solid rgba(78, 62, 42, 0.12);
  border-radius: 18px;
  background: var(--surface-strong);
  color: var(--text);
}

.json-input {
  padding: 18px;
  resize: vertical;
  line-height: 1.7;
  outline: none;
  min-height: 280px;
}

.json-input:focus {
  border-color: rgba(191, 90, 54, 0.5);
  box-shadow: 0 0 0 4px rgba(191, 90, 54, 0.12);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.action-row.compact {
  margin-top: 0;
}

.output-actions {
  align-items: center;
  justify-content: flex-end;
}

.output-primary-button {
  padding-inline: 18px;
  white-space: nowrap;
}

.secondary-action-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 248, 239, 0.52);
}

.secondary-action-button {
  padding: 9px 14px;
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}

.secondary-action-button:hover:not(:disabled) {
  background: var(--surface-soft);
}

button,
.file-upload {
  border: 0;
  border-radius: 999px;
  padding: 11px 16px;
  cursor: pointer;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    opacity 160ms ease,
    border-color 160ms ease;
}

button:hover:not(:disabled),
.file-upload:hover {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.primary-button {
  color: #fffaf6;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow: 0 14px 24px rgba(141, 59, 31, 0.24);
}

.ghost-button,
.file-upload,
.tab-button {
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.message-box {
  margin-bottom: 14px;
  padding: 14px 16px;
  border-radius: 16px;
  font-size: 0.95rem;
  line-height: 1.5;
}

.message-box {
  background: rgba(35, 78, 123, 0.08);
  color: var(--info);
}

.message-box.success,
.schema-result.success {
  background: rgba(30, 122, 85, 0.11);
  color: var(--success);
}

.message-box.error,
.message-box.error {
  background: rgba(179, 58, 47, 0.11);
  color: var(--error);
}

.meta-bar {
  position: sticky;
  top: 18px;
  z-index: 3;
  align-items: center;
  margin-bottom: 14px;
  min-width: 0;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 252, 247, 0.82);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 24px rgba(76, 49, 20, 0.08);
}

.output-top-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.top-action-button {
  white-space: nowrap;
  padding: 9px 12px;
}

.path-chip {
  display: inline-flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  max-width: none;
}

.path-chip code {
  display: block;
  width: 100%;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  scrollbar-gutter: stable;
  padding: 6px 9px;
  border-radius: 10px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  color: var(--text);
}

.tab-group {
  display: inline-flex;
  gap: 6px;
  flex-shrink: 0;
}

.tab-button.active {
  color: #fffaf6;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow: 0 14px 24px rgba(141, 59, 31, 0.24);
}

.view-panel {
  display: none;
  flex: 1;
}

.view-panel.active {
  display: flex;
  flex-direction: column;
}

.tree-toolbar {
  position: sticky;
  top: 88px;
  z-index: 3;
  align-items: center;
  margin-bottom: 12px;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 252, 247, 0.82);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 24px rgba(76, 49, 20, 0.08);
}

.tree-search-group,
.tree-action-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tree-search-group {
  flex: 1 1 auto;
  min-width: 0;
}

.tree-search-input {
  min-width: 220px;
  flex: 1 1 260px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  outline: none;
}

.tree-toolbar .ghost-button,
.meta-bar .ghost-button,
.meta-bar .tab-button {
  padding: 8px 12px;
}

.tree-search-input:focus {
  border-color: rgba(191, 90, 54, 0.5);
  box-shadow: 0 0 0 4px rgba(191, 90, 54, 0.12);
}

.output-shell,
.tree-container {
  flex: 1;
  min-height: 420px;
  overflow: auto;
  padding: 18px;
}

.json-output {
  display: block;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.75;
  color: var(--text);
}

.tree-container {
  padding: 14px 16px 18px;
}

body[data-theme="dark"] .meta-bar,
body[data-theme="dark"] .tree-toolbar {
  background: rgba(15, 23, 37, 0.82);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.24);
}

.back-to-top-button {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 252, 247, 0.88);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 24px rgba(76, 49, 20, 0.14);
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

body[data-theme="dark"] .back-to-top-button {
  background: rgba(15, 23, 37, 0.88);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.tree-list {
  margin: 0;
  padding-left: 18px;
  list-style: none;
}

.tree-list.root {
  padding-left: 0;
}

.tree-node {
  margin: 4px 0;
}

.tree-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 10px;
}

.tree-row:hover {
  background: rgba(191, 90, 54, 0.08);
}

.tree-row.selected {
  background: rgba(191, 90, 54, 0.16);
}

.tree-row.match {
  background: rgba(35, 78, 123, 0.1);
}

.tree-row.current-match {
  outline: 2px solid rgba(191, 90, 54, 0.42);
  outline-offset: 1px;
}

.tree-toggle {
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 8px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
}

.tree-toggle:hover:not(:disabled) {
  border-color: var(--border);
  transform: none;
}

.tree-toggle:disabled {
  opacity: 0;
}

.tree-key {
  color: var(--key);
}

.tree-summary,
.tree-punctuation {
  color: var(--muted);
}

.tree-copy-path {
  margin-left: auto;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  opacity: 0;
  transition: opacity 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.tree-row:hover .tree-copy-path,
.tree-row.selected .tree-copy-path,
.tree-row.current-match .tree-copy-path {
  opacity: 1;
}

.tree-copy-path:hover:not(:disabled) {
  background: var(--surface-soft);
  border-color: var(--border);
  transform: none;
}

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

.token-key {
  color: var(--key);
}

.token-string {
  color: var(--string);
}

.token-number {
  color: var(--number);
}

.token-boolean {
  color: var(--boolean);
  font-weight: 700;
}

.token-null {
  color: var(--null);
  font-weight: 700;
}

@media (max-width: 1080px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .workspace[data-focus="input"],
  .workspace[data-focus="output"] {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: 0;
  }

  .workspace[data-focus="input"] .panel-output,
  .workspace[data-focus="output"] .panel-input {
    display: none;
  }

  .panel-rail-toggle {
    display: none;
  }

  .keyboard-hint {
    top: 70px;
  }

  .tree-toolbar {
    top: 18px;
  }
}

@media (max-width: 760px) {
  .hero-topbar,
  .panel-header,
  .meta-bar,
  .tree-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .path-chip {
    max-width: 100%;
  }

  .tab-group {
    width: 100%;
  }

  .output-top-actions,
  .tree-search-group,
  .tree-action-group,
  .tree-search-input {
    width: 100%;
  }

  .mode-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .tab-button {
    flex: 1;
  }

  .output-actions,
  .secondary-action-group {
    width: 100%;
  }

  .secondary-action-button {
    flex: 1;
  }

  .back-to-top-button {
    right: 16px;
    bottom: 16px;
  }

  .tree-toolbar {
    top: 124px;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 28px 14px 36px;
  }

  .panel {
    padding: 16px;
    border-radius: 20px;
  }

  .output-shell,
  .tree-container {
    min-height: 320px;
  }
}