/* ---------------------------------------------------------------
   Data Explainer — design tokens
   Palette: near-black console + amber/teal dual accent (data-terminal feel,
   not the default cream/terracotta AI look)
----------------------------------------------------------------- */
:root {
  --bg: #0d1117;
  --surface: #141a21;
  --surface-alt: #1b232c;
  --border: #262e37;
  --text: #e8edf3;
  --text-dim: #8b98a5;
  --amber: #f2a63c;
  --teal: #3fb8af;
  --danger: #e0685a;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

.scanline {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.014) 0px,
    rgba(255, 255, 255, 0.014) 1px,
    transparent 1px,
    transparent 3px
  );
}

/* ---------------- topbar ---------------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; font-family: var(--mono); }
.brand-mark { color: var(--amber); font-size: 20px; }
.brand-text { letter-spacing: 0.08em; font-size: 13px; color: var(--text-dim); }
.brand-text b { color: var(--text); font-weight: 600; }

.status {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: lowercase;
}
.status .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 8px var(--teal);
}
.status.busy .dot { background: var(--amber); box-shadow: 0 0 8px var(--amber); animation: blink 1s infinite; }
.status.error .dot { background: var(--danger); box-shadow: 0 0 8px var(--danger); }
@keyframes blink { 50% { opacity: 0.25; } }

/* ---------------- layout ---------------- */
.layout {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 1px;
  background: var(--border);
  min-height: calc(100vh - 130px);
}

@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
}

.panel { background: var(--bg); padding: 40px 36px; }

/* ---------------- upload panel ---------------- */
.upload-panel h1 {
  font-family: var(--mono);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.25;
  margin: 0 0 14px;
  font-weight: 600;
}

.upload-panel .sub {
  color: var(--text-dim);
  max-width: 46ch;
  line-height: 1.6;
  margin: 0 0 28px;
  font-size: 14.5px;
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 36px 20px;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  text-align: center;
}
.dropzone:hover, .dropzone.drag { border-color: var(--amber); background: rgba(242, 166, 60, 0.05); }
.dz-icon { font-size: 22px; color: var(--amber); }
.dz-text { color: var(--text-dim); font-size: 13.5px; }
.dz-file { font-family: var(--mono); font-size: 13px; color: var(--teal); }

.btn-primary {
  margin-top: 18px;
  width: 100%;
  padding: 13px 20px;
  background: var(--amber);
  color: #14100a;
  border: none;
  border-radius: 8px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s ease;
}
.btn-primary:hover:not(:disabled) { transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-primary:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }

/* signature element: column pulse strip */
.pulse-wrap { margin-top: 32px; }
.pulse-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.pulse-strip {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 56px;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.pulse-bar {
  flex: 1;
  min-width: 3px;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(to top, var(--teal), var(--amber));
  transform-origin: bottom;
  animation: grow 0.5s ease forwards;
}
@keyframes grow { from { transform: scaleY(0); } to { transform: scaleY(1); } }

.meta-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.meta-cell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 10px;
  text-align: center;
}
.meta-num { display: block; font-family: var(--mono); font-size: 20px; font-weight: 600; color: var(--amber); }
.meta-label { display: block; font-size: 10.5px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 2px; }

/* ---------------- output panel ---------------- */
.output-panel { background: var(--surface); display: flex; flex-direction: column; }
.output-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.output-model { color: var(--teal); }

.output-body {
  flex: 1;
  overflow-y: auto;
  line-height: 1.7;
  font-size: 15px;
}
.output-body .placeholder { color: var(--text-dim); font-style: italic; }
.output-body h1, .output-body h2, .output-body h3 {
  font-family: var(--mono);
  color: var(--amber);
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 22px 0 10px;
}
.output-body h1:first-child, .output-body h2:first-child, .output-body h3:first-child { margin-top: 0; }
.output-body p { margin: 0 0 14px; color: var(--text); }
.output-body ul, .output-body ol { padding-left: 20px; margin: 0 0 14px; }
.output-body li { margin-bottom: 6px; }
.output-body code { font-family: var(--mono); background: var(--surface-alt); padding: 1px 5px; border-radius: 4px; font-size: 13px; }
.output-body strong { color: #fff; }

.cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--amber);
  margin-left: 2px;
  animation: blink 0.85s steps(1) infinite;
  vertical-align: text-bottom;
}

.error-box {
  border: 1px solid var(--danger);
  background: rgba(224, 104, 90, 0.08);
  color: var(--danger);
  padding: 14px 16px;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 13px;
}

/* ---------------- footer ---------------- */
.foot {
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  padding: 16px;
  border-top: 1px solid var(--border);
}