:root {
  --bg: #f4f3ef;
  --panel: #ffffff;
  --ink: #1c1b19;
  --ink-soft: #57544d;
  --accent: #c15f3c;
  --accent-soft: #f0d9cd;
  --border: #e4e1d8;
  --radius: 14px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.05rem;
}

.brand-mark {
  color: var(--accent);
  font-size: 1.2rem;
}

.badge {
  font-size: 0.75rem;
  padding: 5px 10px;
  border-radius: 100px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(320px, 460px) 1fr;
  gap: 24px;
  padding: 28px;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.input-panel h1 {
  font-family: var(--serif);
  font-size: 1.6rem;
  margin: 0 0 6px;
  line-height: 1.25;
}

.subtitle {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin: 0 0 20px;
  line-height: 1.5;
}

.tabs {
  display: flex;
  gap: 6px;
  background: var(--bg);
  padding: 4px;
  border-radius: 10px;
  margin-bottom: 16px;
}

.tab {
  flex: 1;
  border: none;
  background: transparent;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.tab.active {
  background: var(--panel);
  color: var(--ink);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.tab-panel.hidden { display: none; }

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  padding: 32px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  min-height: 160px;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: #fbf4ef;
}

.dropzone-icon { font-size: 1.8rem; }

.dropzone-text strong {
  display: block;
  font-size: 0.95rem;
}

.dropzone-text span {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.file-chip {
  margin-top: 6px;
  font-size: 0.8rem;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 100px;
  font-weight: 600;
}

textarea#textInput {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  font-family: var(--sans);
  font-size: 0.9rem;
  resize: vertical;
  background: var(--bg);
  color: var(--ink);
}

textarea#textInput:focus, select:focus, input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field {
  margin-top: 16px;
}

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink-soft);
}

select, input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  font-size: 0.88rem;
  font-family: var(--sans);
}

.primary-btn {
  width: 100%;
  margin-top: 22px;
  padding: 13px 18px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: filter 0.15s, transform 0.1s;
}

.primary-btn:hover { filter: brightness(1.06); }
.primary-btn:active { transform: scale(0.99); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
  margin-top: 12px;
  color: #b3261e;
  font-size: 0.85rem;
  background: #fdecea;
  border: 1px solid #f5c2c0;
  padding: 10px 12px;
  border-radius: 8px;
}

.output-panel {
  display: flex;
  flex-direction: column;
  min-height: 480px;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.output-header h2 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: 0;
}

.output-actions { display: flex; gap: 8px; }

.ghost-btn {
  border: 1px solid var(--border);
  background: transparent;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--ink-soft);
}

.ghost-btn:hover { background: var(--bg); }

.output-body {
  flex: 1;
  overflow-y: auto;
  font-size: 0.92rem;
  line-height: 1.65;
}

.output-body :is(h1,h2,h3) {
  font-family: var(--serif);
  margin-top: 1.3em;
}

.output-body pre {
  background: var(--bg);
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
}

.output-body code {
  font-family: var(--mono);
  background: var(--bg);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.85em;
}

.output-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
}

.output-body th, .output-body td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 0.85rem;
  text-align: left;
}

.placeholder {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--ink-soft);
  gap: 8px;
  min-height: 380px;
}

.placeholder-icon { font-size: 1.8rem; }

.cursor-blink::after {
  content: "▍";
  animation: blink 1s step-start infinite;
  color: var(--accent);
}

@keyframes blink { 50% { opacity: 0; } }

.footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding: 16px;
  border-top: 1px solid var(--border);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 16px;
    gap: 16px;
  }
  .topbar { padding: 14px 16px; }
  .panel { padding: 18px; }
  .output-panel { min-height: 320px; }
  .placeholder { min-height: 220px; }
}