@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --outline: #d7dee9;
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --success: #16a34a;
  --text: #0f172a;
  --muted: #4b5563;
  --radius: 12px;
  --shadow: 0 8px 30px rgba(15, 23, 42, 0.12);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 12px 12px 28px;
  font-family: 'Space Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

h1 { margin: 0 0 4px; font-size: 28px; letter-spacing: -0.5px; }
h3 { margin: 0 0 12px; }
p { margin: 0; }

.bg-accent {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 20% 25%, rgba(37,99,235,0.08), transparent 32%), radial-gradient(circle at 80% 20%, rgba(22,163,74,0.06), transparent 30%);
  filter: blur(80px);
  opacity: 0.55;
  z-index: 0;
}

.app-shell {
  position: relative;
  z-index: 1;
  max-width: 100%;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.surface {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  padding: 8px 12px;
  position: static;
  border: 1px solid var(--outline);
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(37,99,235,0.28);
  background: #e6ecff;
}

.brand-copy .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
}

.card {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.muted { color: var(--muted); max-width: 760px; }
.helper { color: var(--muted); font-size: 13px; margin-top: 6px; }

.lang-switch { display: inline-flex; align-items: center; gap: 8px; }
.lang-link {
  padding: 6px 10px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--outline);
  background: #f6f8fb;
  font-weight: 600;
  transition: all 0.15s ease;
}
.lang-link:hover { border-color: var(--primary); box-shadow: none; }
.lang-link.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.inline-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.inline-row--sub { align-items: center; justify-content: space-between; }
.field--compact label {
  margin-bottom: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.2;
}
.field--compact input { padding: 10px 12px; height: 44px; }
.field--files { min-width: 140px; flex: 0 0 180px; }
.field--sample { min-width: 120px; flex: 0 0 150px; }
.inline-label label {
  position: static;
  clip: auto;
  width: auto;
  height: auto;
  margin: 0;
}
.field--filename { min-width: 180px; flex: 0 0 220px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.chain-group {
  display: flex;
  align-items: stretch;
  gap: 0;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
}
.chain-input {
  height: 44px;
  border-radius: 0;
  margin-left: -1px;
  flex: 1 1 auto;
  border: 1px solid var(--outline);
  min-width: 120px;
}
.chain-button {
  height: 44px;
  border-radius: 10px;
  padding: 10px 14px;
  border: 1px solid var(--outline);
  box-shadow: none;
  display: inline-flex;
  align-items: center;
}
.chain-input--left {
  border-radius: 10px 0 0 10px;
  margin-left: 0;
}
.chain-input--mid { border-radius: 0; }

.topbar-form {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 auto;
  min-width: 280px;
  flex-wrap: wrap;
}

.toolbar {
  padding: 6px 0;
  gap: 12px;
}
.toolbar-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.icon-btn {
  border: 1px solid var(--outline);
  background: #f6f8fb;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
}
.icon-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.icon-btn .material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  font-size: 20px;
  line-height: 1;
}
.inline-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}
.inline-toggle input { pointer-events: none; }
.icon-btn.primary { border-color: var(--primary); }
.icon-btn.saveimg { background: var(--outline); color: #0f172a; border-color:#0f172a; }
.icon-btn.success { background: var(--success); color: #fff; border-color: var(--success); }
.icon-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.name-group {
  gap: 6px;
  flex: 1 1 220px;
}
.peaks-card { margin-top: 6px; }
.peaks-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.peaks-actions { display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.peaks-table {
  margin-top: 8px;
  border: 1px solid var(--outline);
  border-radius: 10px;
  overflow: hidden;
}
.stripe-sets {
  display: flex;
  gap: 8px;
  padding: 10px;
  background: #f8f9fd;
  border-bottom: 1px solid var(--outline);
}
.stripe-set-btn {
  border: 1px solid var(--outline);
  background: #fff;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-weight: 600;
}
.stripe-set-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.peaks-row {
  display: grid;
  grid-template-columns: 60px 1fr 1fr 1.2fr 80px 40px;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
}
.peaks-head {
  background: #f3f6fb;
  font-weight: 700;
  color: var(--muted);
  font-size: 13px;
}
.peaks-body .peaks-row:nth-child(odd) { background: #fafbfd; }
.peaks-empty {
  padding: 10px;
  color: var(--muted);
  font-size: 14px;
}
.peaks-hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}
.peaks-color {
  width: 16px;
  height: 16px;
  border-radius: 6px;
  border: 1px solid var(--outline);
}
.peaks-value { font-weight: 700; }
.peaks-tip { color: var(--muted); font-size: 13px; }
.peaks-input {
  width: 100%;
  border: 1px solid var(--outline);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 13px;
}
.peaks-move {
  display: flex;
  gap: 6px;
}
.peaks-move-btn {
  border: 1px solid var(--outline);
  background: #f6f8fb;
  color: var(--text);
  border-radius: 8px;
  padding: 6px 8px;
  cursor: pointer;
  font-size: 12px;
}
.peaks-move-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.peaks-remove {
  border: none;
  background: transparent;
  color: #b91c1c;
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
}
.peaks-remove:hover { color: #991b1b; }

.footer {
  margin-top: 14px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--muted);
}
.footer .footer-links { display: flex; align-items: center; gap: 8px; }
.footer a {
  color: #2563eb;
  text-decoration: none;
  font-weight: 600;
}
.footer a:hover { text-decoration: underline; }
.footer .dot { color: var(--outline-strong); }

/* chain-button now defined above; keep right variant for future */
.chain-button--right { border-left: none; }

.field label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text);
}

.field input[type="text"],
.field input[type="number"],
.field input[type="file"] {
  width: 100%;
  border: 1px solid var(--outline);
  border-radius: 10px;
  padding: 12px 12px;
  background: #fff;
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

input[type="file"]::-webkit-file-upload-button {
  background: #eef2f7;
  border: none;
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  margin-right: 10px;
  font-weight: 700;
  cursor: pointer;
}

.field input:focus {
  border-color: var(--primary);
  outline: none;
  background: #f4f7ff;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.16);
}

.btn {
  border: none;
  border-radius: 12px;
  padding: 10px 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, filter 0.2s ease;
  color: #fff;
  background: var(--primary);
  box-shadow: 0 6px 18px rgba(37,99,235,0.24);
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.02); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; box-shadow: none; }
.btn.tonal { background: #e7edff; color: var(--primary-strong); box-shadow: none; border: 1px solid #d7def5; }
.btn.success { background: var(--success); box-shadow: 0 6px 18px rgba(22,163,74,0.26); color: #f8fff8; }
.btn.primary { background: var(--primary); }

.status-block { display: flex; flex-direction: column; gap: 4px; min-height: 30px; color: var(--muted); font-weight: 500; }
#status { min-height: 20px; font-size: 14px; }
#downloadLink a { color: var(--primary); font-weight: 700; text-decoration: none; }
#downloadLink a:hover { text-decoration: underline; }

.chart-row {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(240px, 1fr);
  gap: 16px;
  align-items: start;
  margin-top: 8px;
}

#chart {
  padding: 12px;
  background: #fff;
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  min-height: 72vh;
}

#zoneHint {
  min-height: 32px;
  padding: 8px 10px;
  border-radius: 10px;
  background: #eef2f7;
  border: 1px solid var(--outline);
  color: var(--text);
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
}

svg {
  width: 100%;
  height: 72vh;
  background: #f8fafc;
  border-radius: 12px;
}

.legend-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px;
  width: 100%;
}

.legend-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--outline);
  border-radius: 10px;
  cursor: pointer;
  background: #fff;
  transition: transform 0.1s ease, border-color 0.2s ease, background 0.2s ease;
  flex-wrap: wrap;
  word-break: break-word;
}
.legend-item:hover { transform: translateY(-1px); border-color: var(--primary); }
.legend-item.inactive { opacity: 0.55; background: #f2f4f7; }
.legend-item.baseline { box-shadow: 0 0 0 2px rgba(37,99,235,0.2); }
.legend-swatch { width: 14px; height: 14px; border-radius: 4px; margin-top: 2px; }
.legend-item span { word-break: break-word; }
.legend-offset {
  width: 88px;
  border-radius: 8px;
  border: 1px solid var(--outline);
  padding: 6px 8px;
  background: #f9fbfe;
  color: var(--text);
}
.legend-remove-btn {
  border: none;
  background: transparent;
  color: #b91c1c;
  font-size: 16px;
  cursor: pointer;
  padding: 4px 6px;
}
.legend-remove-btn:hover { color: #991b1b; }
.legend-name-input {
  border: 1px solid var(--outline);
  border-radius: 6px;
  padding: 4px 6px;
  min-width: 120px;
}
.legend-base-btn {
  border: 1px solid var(--outline);
  background: #f6f8fb;
  color: var(--text);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.legend-base-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.legend-base-btn:hover { border-color: var(--primary); color: var(--primary); }

.controls {
  display: none;
  background: #fff;
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  padding: 14px;
}
.controls.active { display: block; }
.control-group { margin-bottom: 12px; }
.control-group label { display: block; margin-bottom: 6px; font-weight: 600; }
.inline-inputs { display: flex; gap: 8px; align-items: center; }
.inline-inputs input {
  width: 100%;
  max-width: 120px;
  border-radius: 8px;
  border: 1px solid var(--outline);
  padding: 8px 10px;
  background: rgba(255,255,255,0.02);
  color: var(--text);
}
.inline-inputs span { color: var(--muted); }
.control-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.baseline-controls { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
#baselineSeries, #baselineDegree {
  border: 1px solid var(--outline);
  border-radius: 8px;
  padding: 6px 8px;
}
#baselineSeries { min-width: 140px; }
.baseline-group { display: none; }
.save-wrap { display: none; }

.is-hidden { display: none !important; }

@media (max-width: 900px) {
  body { padding: 14px 14px 30px; }
  .card { padding: 16px; }
  .chart-row { grid-template-columns: 1fr; }
  .topbar { position: static; flex-wrap: wrap; }
  .field--files { max-width: 100%; }
  #chart { min-height: 60vh; }
  svg { height: 60vh; }
}