:root {
  --bg: #0b0f1a;
  --bg-elev: #131a2a;
  --panel: #141b2c;
  --panel-2: #1b2438;
  --border: #263349;
  --text: #e6ecf5;
  --muted: #8b98ad;
  --accent: #4fd1c5;
  --accent-2: #6aa6ff;
  --danger: #ff6b6b;
  --danger-bg: #3a1e26;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body,
#root {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

code {
  font-family: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, monospace;
  background: rgba(255, 255, 255, 0.06);
  padding: 0 4px;
  border-radius: 4px;
  font-size: 0.9em;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg));
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.logo {
  font-size: 32px;
  color: var(--accent);
  line-height: 1;
}
.app-header h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.3px;
}
.app-header p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12.5px;
  max-width: 640px;
}
.header-link {
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

/* Layout */
.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 340px 1fr;
  min-height: 0;
}
.sidebar {
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--bg);
}
.main {
  min-width: 0;
  min-height: 0;
  padding: 20px;
  display: flex;
  overflow: auto;
}

/* Panels */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}
.panel-head h2 {
  margin: 0;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}

.muted {
  color: var(--muted);
}
.small {
  font-size: 12px;
}

/* Buttons */
.btn {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: filter 0.12s, background 0.12s;
}
.btn:hover:not(:disabled) {
  filter: brightness(1.15);
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn.primary {
  background: linear-gradient(180deg, var(--accent), #35b0a4);
  color: #04231f;
  border-color: transparent;
  font-weight: 600;
}
.btn.danger {
  background: var(--danger-bg);
  border-color: #5a2a33;
  color: #ffb3b3;
}
.btn-small {
  font: inherit;
  font-size: 12.5px;
  padding: 5px 10px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
}
.btn-small:hover {
  filter: brightness(1.2);
}

/* Dropzone */
.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  color: var(--muted);
  font-size: 12.5px;
  margin-bottom: 12px;
  transition: border-color 0.12s, background 0.12s;
}
.dropzone.dragging {
  border-color: var(--accent);
  background: rgba(79, 209, 197, 0.08);
  color: var(--text);
}

/* Sequence list */
.seq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.seq-list li {
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 8px 10px;
  cursor: pointer;
  background: var(--panel-2);
  transition: border-color 0.12s, background 0.12s;
}
.seq-list li:hover {
  border-color: #35486a;
}
.seq-list li.selected {
  border-color: var(--accent);
  background: rgba(79, 209, 197, 0.09);
}
.seq-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.seq-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}
.seq-actions {
  display: flex;
  gap: 2px;
}
.icon-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  padding: 3px 5px;
  border-radius: 6px;
}
.icon-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}
.icon-btn.danger:hover {
  color: var(--danger);
}
.seq-meta {
  color: var(--muted);
  font-size: 11.5px;
  margin-left: 26px;
}
.rename-input {
  flex: 1;
  font: inherit;
  background: var(--bg);
  border: 1px solid var(--accent);
  color: var(--text);
  border-radius: 6px;
  padding: 3px 6px;
}

/* Phantom panel */
.phantom-options {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.phantom-option {
  flex: 1;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  gap: 1px 8px;
  align-items: center;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--panel-2);
  cursor: pointer;
}
.phantom-option.selected {
  border-color: var(--accent);
  background: rgba(79, 209, 197, 0.09);
}
.phantom-option input {
  grid-row: 1 / 3;
}
.phantom-label {
  font-weight: 600;
}
.phantom-desc {
  grid-column: 2;
  color: var(--muted);
  font-size: 11.5px;
}
.phantom-preview-wrap {
  display: flex;
  gap: 14px;
  align-items: center;
}
.phantom-preview {
  background: radial-gradient(circle at 50% 45%, #0f1830, #070b14);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 150px;
  height: 150px;
}
.phantom-stats {
  font-size: 12.5px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.phantom-stats strong {
  font-size: 16px;
  color: var(--accent);
}

/* Run panel */
.seq-summary {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 12px;
  font-size: 12.5px;
}
.seq-summary > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.seq-summary .k {
  color: var(--muted);
}
.seq-summary .v {
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.run-controls {
  display: flex;
  gap: 8px;
}
.run-controls .btn {
  flex: 1;
}
.progress {
  margin-top: 12px;
}
.progress-bar {
  height: 8px;
  background: var(--bg);
  border-radius: 5px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.15s ease-out;
}
.progress-text {
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.error-banner {
  background: var(--danger-bg);
  border: 1px solid #5a2a33;
  color: #ffb3b3;
  padding: 9px 11px;
  border-radius: 9px;
  font-size: 12.5px;
}

/* K-space view */
.kspace {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  min-height: 0;
}
.kspace-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.segmented {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 9px;
  overflow: hidden;
}
.segmented button {
  font: inherit;
  font-size: 12.5px;
  border: none;
  background: var(--panel);
  color: var(--muted);
  padding: 7px 13px;
  cursor: pointer;
  border-right: 1px solid var(--border);
}
.segmented button:last-child {
  border-right: none;
}
.segmented button:hover {
  color: var(--text);
}
.segmented button.active {
  background: var(--accent);
  color: #04231f;
  font-weight: 600;
}
.kspace-canvas-wrap {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #05070d;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}
.kspace-canvas {
  image-rendering: pixelated;
  max-width: 100%;
  max-height: 68vh;
  object-fit: contain;
  border-radius: 4px;
}
.kspace-info {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}

/* Placeholder / spinner */
.placeholder {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border);
  border-radius: 12px;
  width: 100%;
}
.placeholder-inner {
  text-align: center;
  color: var(--muted);
}
.placeholder-icon {
  font-size: 56px;
  color: var(--border);
  display: block;
  margin-bottom: 12px;
}
.spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 14px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 820px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}