frontend/src/styles.css

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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #232733;
  --border: #2e3340;
  --text: #e1e4eb;
  --text-dim: #8b90a0;
  --accent: #6c8cff;
  --accent-dim: #4a64cc;
  --ok: #4ade80;
  --warn: #facc15;
  --err: #f87171;
  --radius: 8px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---- App Layout ---- */
.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.header-stats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ---- Badges ---- */
.badge {
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--surface2);
  color: var(--text-dim);
}
.badge-ok {
  background: #1a3a2a;
  color: var(--ok);
}
.badge-warn {
  background: #3a3520;
  color: var(--warn);
}

/* ---- Progress Stepper ---- */
.stepper {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  margin-bottom: 28px;
  padding: 0 24px;
}

.stepper-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  position: relative;
  z-index: 1;
}

.stepper-line {
  flex: 1;
  height: 2px;
  background: var(--border);
  margin-top: 16px;
  min-width: 40px;
}

.stepper-line-active {
  background: var(--accent-dim);
}

.stepper-circle {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.stepper-circle:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.stepper-circle.stepper-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.stepper-circle.stepper-done {
  border-color: var(--ok);
  background: #1a3a2a;
  color: var(--ok);
}

.stepper-circle:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.stepper-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  white-space: nowrap;
  font-weight: 500;
}

.stepper-label-active {
  color: var(--accent);
  font-weight: 600;
}

/* ---- Sub-tabs ---- */
.subtabs {
  display: flex;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
  margin-bottom: 20px;
  overflow-x: auto;
}

.subtab {
  padding: 7px 16px;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.15s;
}

.subtab:hover {
  color: var(--text);
  background: var(--surface2);
}

.subtab-active {
  color: #fff;
  background: var(--accent);
  font-weight: 600;
}

/* ---- Collapsible Toggle ---- */
.collapsible-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 14px 16px;
  margin: 16px 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.collapsible-toggle:hover {
  color: var(--text);
  border-color: var(--accent-dim);
}

.collapsible-arrow {
  font-size: 0.75rem;
}

/* ---- Advanced Settings Toggle ---- */
.advanced-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  margin: 12px 0 0;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s;
}

.advanced-toggle:hover {
  color: var(--accent);
}

.advanced-section {
  padding-top: 8px;
  margin-bottom: 12px;
}

/* ---- Toggle (segmented control) ---- */
.toggle {
  display: inline-flex;
  gap: 2px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
}

.toggle-option {
  padding: 6px 14px;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.toggle-option:hover {
  color: var(--text);
}

.toggle-option-active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* ---- Switch (on/off) ---- */
.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.switch-track {
  position: relative;
  width: 40px;
  height: 22px;
  border-radius: 11px;
  background: var(--border);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background 0.2s;
}

.switch-track-on {
  background: var(--accent);
}

.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}

.switch-track-on .switch-thumb {
  transform: translateX(18px);
}

.switch-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
  user-select: none;
}

/* ---- Custom Select ---- */
.custom-select {
  position: relative;
  min-width: 180px;
}

.custom-select-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.875rem;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.15s;
  text-align: left;
}

.custom-select-trigger:hover,
.custom-select-trigger:focus {
  border-color: var(--accent);
  outline: none;
}

.custom-select-arrow {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-left: 8px;
}

.custom-select-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  z-index: 100;
  max-height: 240px;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.custom-select-option {
  display: block;
  width: 100%;
  padding: 8px 10px;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
  transition: all 0.1s;
}

.custom-select-option:hover {
  background: var(--surface2);
  color: var(--text);
}

.custom-select-option-active {
  background: var(--accent);
  color: #fff;
}

.custom-select-option-active:hover {
  background: var(--accent-dim);
  color: #fff;
}

/* ---- Server Error Banner ---- */
.server-error-banner {
  background: #3a1a1a;
  color: var(--err);
  border: 1px solid #5a2a2a;
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ---- Content ---- */
.content {
  min-height: 400px;
}

/* ---- Cards / Panels ---- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.panel h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.panel h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-dim);
}

/* ---- Forms ---- */
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 180px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-dim);
}

input,
textarea,
select {
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.875rem;
  font-family: inherit;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

/* ---- Buttons ---- */
button.btn {
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-dim);
}
.btn-secondary {
  background: var(--surface2);
  color: var(--text);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---- Results ---- */
.result-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 10px;
  transition: border-color 0.15s;
}

.result-card:hover {
  border-color: var(--accent-dim);
}

.result-card .result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  gap: 8px;
}

.result-card-selected {
  border-color: var(--accent);
}

.result-card .result-text {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.score-bar-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.score-bar {
  width: 120px;
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  overflow: hidden;
}

.score-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s;
}

.score-label {
  font-size: 0.8rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 48px;
  text-align: right;
}

/* ---- Similarity gauge ---- */
.similarity-gauge {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 24px;
}

.similarity-value {
  font-size: 3rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.similarity-label {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ---- Status / Alerts ---- */
.status {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  margin-bottom: 12px;
}
.status-ok {
  background: #1a3a2a;
  color: var(--ok);
}
.status-err {
  background: #3a1a1a;
  color: var(--err);
}
.status-loading {
  background: var(--surface2);
  color: var(--text-dim);
}

/* ---- Table ---- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.data-table th,
.data-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.data-table tr:hover td {
  background: var(--surface2);
}
.data-table input,
.data-table select {
  font-size: 0.85rem;
}

/* ---- Grid ---- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ---- Metric Card ---- */
.metric-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.metric-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

/* ---- Spinner ---- */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--text-dim);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 6px;
  vertical-align: middle;
}

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

/* ---- Tags ---- */
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--surface);
  margin: 2px;
}

.tag-best {
  background: #1a3a2a;
  color: var(--ok);
}

/* ---- Utility classes ---- */
.panel-desc {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.text-dim { color: var(--text-dim); }

.form-group-sm { max-width: 100px; }
.form-group-md { max-width: 140px; }
.form-group-lg { max-width: 220px; }

.metric-grid {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.metric-grid > * {
  flex: 1 1 100px;
}

.flex-row { display: flex; gap: 8px; }
.flex-col { display: flex; flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }

.gap-1 { gap: 8px; }
.gap-2 { gap: 12px; }
.gap-3 { gap: 16px; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 16px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 12px; }
.mb-3 { margin-bottom: 16px; }

/* ---- Context Analysis bar chart ---- */
.context-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.context-bar-label {
  width: 90px;
  font-size: 0.82rem;
  font-weight: 600;
  text-align: right;
  color: var(--text);
  flex-shrink: 0;
}

.context-bar-track {
  flex: 1;
  height: 8px;
  background: var(--bg);
  border-radius: 4px;
  overflow: hidden;
}

.context-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.3s;
}

.context-bar-value {
  font-size: 0.75rem;
  color: var(--text-dim);
  width: 40px;
  text-align: right;
  flex-shrink: 0;
}

.context-snippet {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
  padding: 8px 10px;
  background: var(--bg);
  border-radius: 6px;
  margin-bottom: 4px;
}

.context-snippet-source {
  font-size: 0.7rem;
  color: var(--accent);
  margin-right: 6px;
}

.score-bar-legend {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 4px;
}