/* ── Reset & tokens ─────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0d0f1a;
  --surface: #13162b;
  --surface2: #1a1e35;
  --border: #252940;
  --border-glow: #4f6ef7;
  --accent: #4f6ef7;
  --accent2: #7c3aed;
  --accent-grad: linear-gradient(135deg, #4f6ef7 0%, #7c3aed 100%);
  --success: #10b981;
  --error: #f43f5e;
  --warn: #f59e0b;
  --text: #e2e5f1;
  --text-muted: #6b7280;
  --text-dim: #9ca3af;
  --font-ui: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --glow: 0 0 20px rgba(79,110,247,.15);
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.6;
  overflow: hidden;
}

/* ── Layout ─────────────────────────────────────────────────────────────── */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Header ─────────────────────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 52px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
  z-index: 10;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-logo {
  width: 28px;
  height: 28px;
  background: var(--accent-grad);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(79,110,247,.4);
}

.brand-name {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.3px;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(79,110,247,.12);
  border: 1px solid rgba(79,110,247,.25);
  padding: 2px 7px;
  border-radius: 20px;
}

.header-center {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
}

.example-select {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 12.5px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
  transition: border-color .2s;
}
.example-select:hover,
.example-select:focus {
  border-color: var(--accent);
}
.example-select option {
  background: var(--surface2);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all .18s ease;
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 2px 12px rgba(79,110,247,.35);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 18px rgba(79,110,247,.5);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-primary:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--surface2);
  color: var(--text);
  border-color: var(--text-muted);
}

/* ── Main workspace ─────────────────────────────────────────────────────── */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  flex: 1;
  min-height: 0;
}

/* ── Panel ─────────────────────────────────────────────────────────────── */
.panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  height: 36px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .6px;
  text-transform: uppercase;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.panel-body {
  flex: 1;
  min-height: 0;
  position: relative;
}

/* ── Dividers ──────────────────────────────────────────────────────────── */
.divider {
  width: 1px;
  background: var(--border);
  flex-shrink: 0;
}

/* ── Payload panel (middle) ──────────────────────────────────────────────── */
.panel-middle {
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.shortcut-hint {
  font-size: 11px;
  color: var(--text-muted);
}

kbd {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 10px;
}

/* ── Status bar ─────────────────────────────────────────────────────────── */
.status-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  font-size: 11.5px;
  flex-shrink: 0;
  min-height: 28px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: background .3s;
}
.status-dot.ok {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}
.status-dot.error {
  background: var(--error);
  box-shadow: 0 0 6px var(--error);
}
.status-dot.running {
  background: var(--warn);
  box-shadow: 0 0 6px var(--warn);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: .4;
  }
}

.status-text {
  color: var(--text-dim);
  flex: 1;
}
.status-time {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ── Monaco container ───────────────────────────────────────────────────── */
.editor-container {
  width: 100%;
  height: 100%;
}

/* ── Output ─────────────────────────────────────────────────────────────── */
.output-container {
  width: 100%;
  height: 100%;
  overflow: auto;
  padding: 16px;
}

.output-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  gap: 12px;
  user-select: none;
}

.output-placeholder-icon {
  font-size: 36px;
  opacity: .35;
}
.output-placeholder-text {
  font-size: 13px;
}

.output-json {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  white-space: pre;
}

.output-error {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--error);
  background: rgba(244,63,94,.07);
  border: 1px solid rgba(244,63,94,.2);
  border-radius: var(--radius);
  padding: 14px 16px;
  white-space: pre-wrap;
  word-break: break-word;
}

.output-xlsx-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 180px;
  padding: 32px;
  text-align: center;
}

/* ── XLSX upload bar ─────────────────────────────────────────────────────────── */

.xlsx-upload-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
}

/* Completely hide the native <input type="file"> */
.xlsx-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* Style the <label> as a button — clicks it, which opens the file dialog */
.xlsx-upload-btn {
  cursor: pointer;
  padding: 3px 10px;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  user-select: none;
}

.xlsx-upload-btn:hover {
  background: var(--surface-hover);
}

/* Filename display */
.xlsx-file-name {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 260px;
}

.xlsx-file-name.loaded {
  color: var(--accent);
}

.output-error-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .7px;
  text-transform: uppercase;
  color: var(--error);
  margin-bottom: 8px;
  opacity: .75;
}

/* ── JSON syntax highlight ─────────────────────────────────────────────── */
.json-key {
  color: #79b8ff;
}
.json-string {
  color: #9ecbff;
}
.json-number {
  color: #f0883e;
}
.json-bool {
  color: #ff7b72;
}
.json-null {
  color: #8b949e;
}
.json-punct {
  color: var(--text-muted);
}

/* ── Spinner ────────────────────────────────────────────────────────────── */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
}

/* ── Scrollbar ──────────────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ── Fade-in animation ──────────────────────────────────────────────────── */
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.anim-in {
  animation: fadeSlideIn .25s ease forwards;
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    overflow: auto;
  }
  html,
  body {
    overflow: auto;
  }
  .app {
    height: auto;
  }
  .panel-body {
    min-height: 260px;
  }
  .panel-middle {
    border: none;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface2: #f1f5f9;
    --border: #e2e8f0;
    --border-glow: #4f6ef7;
    --accent: #4338ca;
    --accent2: #6d28d9;
    --accent-grad: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);
    --text: #0f172a;
    --text-muted: #64748b;
    --text-dim: #475569;
    --shadow: 0 4px 24px rgba(0,0,0,.06);
    --glow: 0 0 20px rgba(79,110,247,.15);
  }

  .json-key {
    color: #0550ae;
  }
  .json-string {
    color: #0a3069;
  }
  .json-number {
    color: #953800;
  }
  .json-bool {
    color: #cf222e;
  }
  .json-null {
    color: #57606a;
  }

  .output-error {
    background: rgba(229,83,75,.07);
    border-color: rgba(229,83,75,.2);
  }

  .spinner {
    border: 2px solid rgba(0,0,0,.1);
    border-top-color: #fff;
  }
}

/* ── Responsive Mobile Fixes ────────────────────────────────────────────── */
@media (max-width: 700px) {
  header {
    padding: 0 10px;
    gap: 6px;
  }
  .brand-name,
  .brand-badge,
  .shortcut-hint,
  .btn-text {
    display: none !important;
  }
  .header-center span {
    display: none;
  }
  .example-select {
    width: 120px;
  }
}