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static/style.css

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+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
+  background: #f8fafc;
+  color: #1e293b;
+  line-height: 1.5;
+}
+
+.container {
+  max-width: 900px;
+  margin: 0 auto;
+  padding: 2rem;
+}
+
+header {
+  margin-bottom: 1.5rem;
+}
+
+header h1 {
+  margin: 0 0 0.25rem;
+  font-size: 1.75rem;
+  font-weight: 700;
+}
+
+.tagline {
+  margin: 0;
+  font-size: 0.95rem;
+  color: #64748b;
+}
+
+.desc {
+  margin: 0.5rem 0 0;
+  font-size: 0.9rem;
+  color: #475569;
+}
+
+/* Tabs */
+.tabs {
+  display: flex;
+  gap: 0;
+  margin-bottom: 1rem;
+  border-bottom: 1px solid #e2e8f0;
+}
+
+.tab-btn {
+  padding: 0.6rem 1.2rem;
+  font-size: 0.95rem;
+  font-weight: 500;
+  background: none;
+  border: none;
+  border-bottom: 2px solid transparent;
+  color: #64748b;
+  cursor: pointer;
+  margin-bottom: -1px;
+}
+
+.tab-btn:hover {
+  color: #334155;
+}
+
+.tab-btn.active {
+  color: #3b82f6;
+  border-bottom-color: #3b82f6;
+}
+
+.tab-content {
+  display: none;
+}
+
+.tab-content.active {
+  display: block;
+}
+
+main {
+  display: flex;
+  flex-direction: column;
+  gap: 1.5rem;
+}
+
+.input-section {
+  background: #fff;
+  border-radius: 8px;
+  padding: 1rem;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
+}
+
+.input-header {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  align-items: center;
+  gap: 0.75rem;
+  margin-bottom: 0.5rem;
+}
+
+.input-header label {
+  font-weight: 500;
+  font-size: 0.9rem;
+}
+
+.input-actions {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+}
+
+#sample-select {
+  padding: 0.35rem 0.5rem;
+  font-size: 0.85rem;
+  border: 1px solid #cbd5e1;
+  border-radius: 4px;
+  background: #fff;
+}
+
+.pred-steps {
+  display: flex;
+  align-items: center;
+  gap: 0.35rem;
+  font-size: 0.85rem;
+}
+
+#pred-steps {
+  width: 3.5rem;
+  padding: 0.35rem;
+  font-size: 0.9rem;
+  border: 1px solid #cbd5e1;
+  border-radius: 4px;
+}
+
+#ts-input {
+  width: 100%;
+  padding: 0.75rem;
+  font-size: 0.9rem;
+  font-family: inherit;
+  border: 1px solid #e2e8f0;
+  border-radius: 6px;
+  resize: vertical;
+  min-height: 80px;
+}
+
+#ts-input:focus {
+  outline: none;
+  border-color: #3b82f6;
+  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
+}
+
+.output-section {
+  background: #fff;
+  border-radius: 8px;
+  padding: 1rem;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
+}
+
+.forecast-display {
+  margin-bottom: 1rem;
+  font-size: 1rem;
+}
+
+.forecast-display .label {
+  color: #64748b;
+}
+
+.forecast-display .value {
+  font-weight: 600;
+  color: #1e293b;
+}
+
+.forecast-display .range {
+  font-size: 0.85rem;
+  color: #64748b;
+  margin-left: 0.25rem;
+}
+
+.loading {
+  padding: 0.5rem 0;
+  color: #3b82f6;
+  font-size: 0.9rem;
+}
+
+.error {
+  padding: 0.5rem 0;
+  color: #dc2626;
+  font-size: 0.9rem;
+}
+
+.chart-container {
+  position: relative;
+  height: 300px;
+  margin: 1rem 0;
+}
+
+.download-row {
+  margin-top: 1rem;
+}
+
+#download-csv {
+  padding: 0.5rem 1rem;
+  font-size: 0.9rem;
+  background: #3b82f6;
+  color: #fff;
+  border: none;
+  border-radius: 6px;
+  cursor: pointer;
+}
+
+#download-csv:hover {
+  background: #2563eb;
+}
+
+#download-csv:disabled {
+  background: #94a3b8;
+  cursor: not-allowed;
+}
+
+/* Compare tab */
+.compare-section {
+  background: #fff;
+  border-radius: 8px;
+  padding: 1.5rem;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
+}
+
+.compare-section h2 {
+  margin: 0 0 0.75rem;
+  font-size: 1.25rem;
+}
+
+.compare-intro {
+  margin: 0 0 1.5rem;
+  color: #475569;
+  font-size: 0.95rem;
+}
+
+.pipeline-row {
+  display: flex;
+  flex-direction: column;
+  gap: 2rem;
+}
+
+.pipeline-block {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+}
+
+.pipeline-label {
+  margin: 0;
+  font-size: 1rem;
+  font-weight: 600;
+  color: #334155;
+}
+
+.pipeline {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.25rem 0;
+}
+
+.pipeline.ml-pipeline {
+  font-size: 0.8rem;
+}
+
+.pipeline.chronos-pipeline {
+  font-size: 1rem;
+}
+
+.pipeline .step {
+  padding: 0.4rem 0.6rem;
+  border: 1px solid #e2e8f0;
+  border-radius: 4px;
+  background: #f8fafc;
+  white-space: nowrap;
+}
+
+.pipeline .step.highlight {
+  background: #ecfdf5;
+  border-color: #059669;
+  color: #047857;
+  font-weight: 600;
+}
+
+.pipeline .arrow {
+  color: #94a3b8;
+  font-size: 0.9em;
+  padding: 0 0.2rem;
+}
+
+.pipeline.chronos-pipeline .arrow {
+  font-size: 1.1em;
+}
+
+.compare-cta {
+  margin: 1.5rem 0 0;
+  font-size: 0.95rem;
+  color: #475569;
+}
+
+.compare-cta strong {
+  color: #059669;
+}