:root {
  color-scheme: light;
  --bg: #f9f9f7;
  --panel: #ffffff;
  --panel-2: #f1f0ec;
  --line: #e1e0d9;
  --text: #0b0b0b;
  --muted: #52514e;
  --accent: #2a78d6;
  --accent-hover: #1f61b3;
  --error: #d03b3b;
  --shadow: 0 1px 2px rgba(11, 11, 11, 0.04), 0 8px 24px rgba(11, 11, 11, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0d0d0d;
    --panel: #171716;
    --panel-2: #1f1f1d;
    --line: #2c2c2a;
    --text: #ffffff;
    --muted: #c3c2b7;
    --accent: #3987e5;
    --accent-hover: #5a9ded;
    --error: #ff6b6b;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 560px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

header {
  margin-bottom: 36px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  text-align: center;
}

.subtitle {
  color: var(--muted);
  margin: 0;
  text-align: center;
  line-height: 1.5;
}

.upload-card {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.drop-zone {
  position: relative;
  flex: 1 1 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 36px 20px;
  border: 2px dashed var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
  text-align: center;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

.drop-zone:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

.drop-zone.is-dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
  transform: scale(1.005);
}

.drop-zone-icon {
  width: 32px;
  height: 32px;
  color: var(--muted);
  opacity: 0.7;
}

.drop-zone-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.drop-zone-browse {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.drop-zone-browse:hover {
  color: var(--accent-hover);
}

.drop-zone-filename {
  margin: 6px 0 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--panel-2);
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

#analyzeBtn {
  padding: 12px 24px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.15s ease, transform 0.1s ease;
}

#analyzeBtn:hover:not(:disabled) {
  background: var(--accent-hover);
}

#analyzeBtn:active:not(:disabled) {
  transform: translateY(1px);
}

#analyzeBtn:disabled {
  background: var(--panel-2);
  color: var(--muted);
  box-shadow: none;
  cursor: not-allowed;
}

.status[hidden] {
  display: none;
}

.status {
  margin-top: 24px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.status.error {
  color: var(--error);
  font-weight: 600;
}

#loading::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  animation: spin 0.7s linear infinite;
  flex: none;
}

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

/* ---- viz-root: chart-scoped tokens, per the dataviz reference palette ---- */
.viz-root {
  color-scheme: light;
  margin-top: 32px;
  --surface-1:      #fcfcfb;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --gridline:       #e1e0d9;
  --series-alegre:  #2a78d6;
  --series-neutra:  #eb6834;
  --series-triste:  #1baf7a;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) .viz-root {
    color-scheme: dark;
    --surface-1:      #1f1f1d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --gridline:       #2c2c2a;
    --series-alegre:  #3987e5;
    --series-neutra:  #d95926;
    --series-triste:  #199e70;
  }
}

.viz-root {
  background: var(--surface-1);
  border: 1px solid var(--gridline);
  border-radius: 14px;
  padding: 28px;
  box-shadow: var(--shadow);
  animation: fade-in 0.25s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.winner-label {
  font-size: 1.1rem;
  margin: 0 0 4px;
  color: var(--text-primary);
}

.winner-label span {
  font-weight: 700;
  color: var(--accent);
}

.chart {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
}

.bar-row {
  display: grid;
  grid-template-columns: 84px 1fr 56px;
  align-items: center;
  gap: 10px;
}

.bar-row .bar-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.bar-row.is-winner .bar-label {
  color: var(--text-primary);
  font-weight: 700;
}

.bar-track {
  background: var(--gridline);
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.5s ease;
  opacity: 0.55;
}

.bar-row.is-winner .bar-fill {
  opacity: 1;
}

.bar-value {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.bar-row.is-winner .bar-value {
  color: var(--text-primary);
  font-weight: 700;
}

@media (max-width: 520px) {
  .page {
    padding: 40px 16px 56px;
  }

  .drop-zone {
    padding: 28px 14px;
  }
}

.about-model {
  margin-top: 28px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.about-model summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  list-style: none;
}

.about-model summary::-webkit-details-marker {
  display: none;
}

.about-model summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 6px;
  color: var(--accent);
  transition: transform 0.15s ease;
}

.about-model[open] summary::before {
  transform: rotate(90deg);
}

.about-model p {
  margin: 10px 0 0;
}

.about-model code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.85em;
}

.about-model + .about-model {
  margin-top: 14px;
}

.about-model ol {
  margin: 10px 0 0;
  padding-left: 20px;
}

.about-model li {
  margin-bottom: 6px;
}