:root {
  --radius: 18px;
  --radius-sm: 12px;
  --danger: #ff4d6d;
  --font-display: "Fraunces", ui-serif, Georgia, serif;
  --font-ui: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --accordion-inset: 16px;
  --accordion-inset-compact: 11px;
  --side-rail-width: 58px;
  --hero-wave-opacity: 0.78;
  --hero-wave-scan-width: 2.4;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #06070a;
  --bg-2: #0b0f14;
  --panel: rgba(15, 19, 26, 0.92);
  --panel-2: rgba(18, 24, 34, 0.92);
  --panel-solid: rgba(11, 15, 20, 0.62);
  --panel-soft: rgba(11, 15, 20, 0.55);
  --text: #e9eef5;
  --muted: rgba(233, 238, 245, 0.7);
  --muted-2: rgba(233, 238, 245, 0.54);
  --accent: #5be7ff;
  --accent-2: #e0882c;
  --accent-soft: rgba(91, 231, 255, 0.12);
  --accent-soft-strong: rgba(91, 231, 255, 0.2);
  --accent-2-soft: rgba(224, 136, 44, 0.18);
  --border: rgba(233, 238, 245, 0.12);
  --border-strong: rgba(233, 238, 245, 0.22);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
  --shadow-soft: 0 10px 28px rgba(0, 0, 0, 0.35);
  --focus: rgba(91, 231, 255, 0.9);
  --plot-bg: #0f131a;
  --plot-grid: rgba(233, 238, 245, 0.09);
  --plot-compare: #9aa3b2;
  --plot-legend-bg: rgba(15, 19, 26, 0.82);
  --plot-legend-border: #2a3140;
  --plot-mean-x: #ff3b30;
  --plot-mean-y: #ff2d55;
  --status-idle: #6b7280;
  --status-ok: var(--accent);
  --page-radial-a: rgba(91, 231, 255, 0.18);
  --page-radial-b: rgba(224, 136, 44, 0.14);
  --grid-line-a: rgba(233, 238, 245, 0.04);
  --grid-line-b: rgba(233, 238, 245, 0.03);
  --grid-dot: rgba(233, 238, 245, 0.035);
  --hero-bg: linear-gradient(180deg, rgba(15, 19, 26, 0.78), rgba(15, 19, 26, 0.55));
  --hero-wave-base: rgba(91, 231, 255, 0.22);
  --hero-wave-shadow: rgba(91, 231, 255, 0.28);
  --hero-wave-opacity: 0.9;
  --hero-wave-scan-width: 2.85;
  --control-bg: rgba(11, 15, 20, 0.62);
  --control-focus: rgba(91, 231, 255, 0.12);
  --ghost-bg: rgba(233, 238, 245, 0.03);
  --ghost-hover-bg: rgba(233, 238, 245, 0.05);
  --modal-backdrop: rgba(6, 7, 10, 0.74);
  --selection-bg: rgba(224, 136, 44, 0.16);
  --scroll-track: rgba(233, 238, 245, 0.05);
  --scroll-thumb: color-mix(in srgb, var(--accent) 36%, var(--border));
  --scroll-thumb-hover: color-mix(in srgb, var(--accent) 58%, var(--border-strong));
  --disabled-bg: color-mix(in srgb, var(--panel-solid) 88%, transparent);
  --disabled-border: color-mix(in srgb, var(--border) 82%, transparent);
  --disabled-text: color-mix(in srgb, var(--muted) 84%, transparent);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #edf2fa;
  --bg-2: #f8fbff;
  --panel: rgba(255, 255, 255, 0.95);
  --panel-2: rgba(247, 251, 255, 0.92);
  --panel-solid: rgba(255, 255, 255, 0.9);
  --panel-soft: rgba(253, 255, 255, 0.88);
  --text: #0f2234;
  --muted: rgba(15, 34, 52, 0.72);
  --muted-2: rgba(15, 34, 52, 0.58);
  --accent: #007fa3;
  --accent-2: #c96a1f;
  --accent-soft: rgba(0, 127, 163, 0.12);
  --accent-soft-strong: rgba(0, 127, 163, 0.2);
  --accent-2-soft: rgba(201, 106, 31, 0.2);
  --border: rgba(15, 34, 52, 0.18);
  --border-strong: rgba(15, 34, 52, 0.34);
  --shadow: 0 20px 54px rgba(19, 42, 66, 0.18);
  --shadow-soft: 0 10px 26px rgba(19, 42, 66, 0.12);
  --focus: rgba(0, 127, 163, 0.72);
  --plot-bg: #f9fcff;
  --plot-grid: rgba(15, 34, 52, 0.14);
  --plot-compare: #6d7787;
  --plot-legend-bg: rgba(244, 250, 255, 0.94);
  --plot-legend-border: rgba(15, 34, 52, 0.2);
  --plot-mean-x: #d6372a;
  --plot-mean-y: #c8297a;
  --status-idle: #7f8c98;
  --status-ok: #0f9fc5;
  --page-radial-a: rgba(0, 127, 163, 0.14);
  --page-radial-b: rgba(201, 106, 31, 0.12);
  --grid-line-a: rgba(15, 34, 52, 0.06);
  --grid-line-b: rgba(15, 34, 52, 0.04);
  --grid-dot: rgba(15, 34, 52, 0.03);
  --hero-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(247, 251, 255, 0.9));
  --hero-wave-base: rgba(0, 127, 163, 0.24);
  --hero-wave-shadow: rgba(0, 127, 163, 0.23);
  --hero-wave-opacity: 0.86;
  --hero-wave-scan-width: 2.5;
  --control-bg: rgba(255, 255, 255, 0.9);
  --control-focus: rgba(0, 127, 163, 0.16);
  --ghost-bg: rgba(15, 34, 52, 0.03);
  --ghost-hover-bg: rgba(15, 34, 52, 0.08);
  --modal-backdrop: rgba(16, 28, 44, 0.28);
  --selection-bg: rgba(201, 106, 31, 0.14);
  --scroll-track: rgba(15, 34, 52, 0.08);
  --scroll-thumb: rgba(0, 127, 163, 0.34);
  --scroll-thumb-hover: rgba(0, 127, 163, 0.52);
  --disabled-bg: rgba(15, 34, 52, 0.05);
  --disabled-border: rgba(15, 34, 52, 0.16);
  --disabled-text: rgba(15, 34, 52, 0.45);
}

* { box-sizing: border-box; }

::selection {
  background: color-mix(in srgb, var(--accent-2-soft) 76%, transparent);
  color: var(--text);
}

html {
  /* Prevent layout "jump" when the vertical scrollbar appears/disappears. */
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  background:
    radial-gradient(900px 600px at 10% -10%, var(--page-radial-a), transparent 60%),
    radial-gradient(900px 600px at 110% 10%, var(--page-radial-b), transparent 62%),
    linear-gradient(180deg, var(--bg-2), var(--bg) 62%);
  color: var(--text);
  /* Fallback for browsers without scrollbar-gutter (common on Windows). */
  overflow-y: scroll;
  min-height: 100vh;
  position: relative;
  isolation: isolate;
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, var(--grid-line-a) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, var(--grid-line-b) 0 1px, transparent 1px 72px),
    radial-gradient(circle at 1px 1px, var(--grid-dot) 1px, transparent 0);
  background-size: auto, auto, 3px 3px;
  opacity: 0.26;
  mix-blend-mode: overlay;
  z-index: -1;
}

.app {
  /* Use the full viewport width so plots can get more room on wide screens. */
  max-width: none;
  width: 100%;
  margin: 0;
  padding: 28px clamp(10px, 1.4vw, 22px) 40px;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 18px;
  padding: 16px 18px 66px;
  margin-bottom: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--hero-bg);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  isolation: isolate;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: min(86ch, 100%);
  padding-right: 12px;
}

.eyebrow {
  font-variant-caps: all-small-caps;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: color-mix(in srgb, var(--text) 76%, transparent);
  margin: 0 0 6px;
}

h1 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(26px, 2.25vw, 34px);
  font-weight: 760;
  letter-spacing: -0.02em;
}

.sub {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
  line-height: 1.45;
}

.hero-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
  flex-wrap: wrap;
  z-index: 2;
}

.lang-select-wrap {
  display: inline-flex;
  align-items: center;
}

.lang-select {
  min-width: 68px;
  width: auto;
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  backdrop-filter: blur(8px);
  position: relative;
  z-index: 2;
  line-height: 1.35;
  white-space: nowrap;
}

.theme-toggle {
  width: auto;
  min-width: 112px;
  padding: 9px 12px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.35;
  border-radius: 999px;
  letter-spacing: 0.03em;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--status-dot, #6b7280);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--status-dot, var(--status-idle)) 24%, transparent);
  position: relative;
}

.dot::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: inherit;
  background: radial-gradient(circle, var(--status-dot, #6b7280), transparent 60%);
  opacity: 0.35;
  filter: blur(4px);
}

.hero-wave {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 8px;
  height: 42px;
  pointer-events: none;
  opacity: var(--hero-wave-opacity);
  z-index: 0;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, transparent 34%, #000 66%, #000 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, transparent 34%, #000 66%, #000 100%);
}

.hero-wave__base {
  fill: none;
  stroke: var(--hero-wave-base);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-wave__scan {
  fill: none;
  stroke: url(#wave-grad);
  stroke-width: var(--hero-wave-scan-width);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 72 860;
  animation: wave-scan 4.4s linear infinite;
  filter: drop-shadow(0 0 12px var(--hero-wave-shadow));
}

@keyframes wave-scan {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: -932; }
}

.layout {
  display: grid;
  /* Keep columns stable even if side panels contain long (unwrapped) content. */
  grid-template-columns: var(--left-col, clamp(420px, 24vw, 560px)) 12px minmax(0, 1fr) 12px var(--right-col, clamp(420px, 24vw, 560px));
  gap: 14px;
  align-items: start;
}

.layout.left-collapsed {
  grid-template-columns: var(--side-rail-width) 8px minmax(0, 1fr) 12px var(--right-col, clamp(420px, 24vw, 560px));
}

.layout.right-collapsed {
  grid-template-columns: var(--left-col, clamp(420px, 24vw, 560px)) 12px minmax(0, 1fr) 8px var(--side-rail-width);
}

.layout.left-collapsed.right-collapsed {
  grid-template-columns: var(--side-rail-width) 8px minmax(0, 1fr) 8px var(--side-rail-width);
}

.splitter {
  align-self: stretch;
  cursor: col-resize;
  border-radius: 999px;
  background: transparent;
  position: relative;
  touch-action: none;
}

.splitter::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 12px;
  bottom: 12px;
  width: 2px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: var(--border);
  opacity: 0.9;
}

.splitter:hover::before {
  background: var(--accent);
}

body.resizing {
  user-select: none;
  cursor: col-resize;
}

.panel {
  position: relative;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-soft);
  /* Classic CSS grid fix: allow the panel to shrink instead of forcing layout shifts. */
  min-width: 0;
  /* Enable container queries so form grids can adapt to the panel width (zoom/responsive). */
  container-type: inline-size;
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 8%, transparent),
    inset 0 -1px 0 rgba(0, 0, 0, 0.35);
  opacity: 0.8;
}

.panel.side::before {
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--text) 8%, transparent);
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 18px;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.panel.side > h2 {
  min-height: 32px;
  display: flex;
  align-items: center;
  padding-right: 56px;
}

.side-collapse-btn {
  position: absolute;
  top: 10px;
  right: 26px;
  z-index: 3;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--ghost-bg);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.side-collapse-btn:hover {
  background: var(--ghost-hover-bg);
  border-color: color-mix(in srgb, var(--text) 24%, transparent);
}

.panel h3 {
  margin: 18px 0 10px;
  font-size: 12px;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.11em;
  color: var(--muted);
  line-height: 1.35;
}

.accordion {
  --accordion-inset-local: var(--accordion-inset);
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel-solid) 95%, transparent), color-mix(in srgb, var(--panel-soft) 88%, transparent));
  padding: 0;
  margin: 0 0 10px;
  overflow: hidden;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--text) 5%, transparent);
}

.accordion > summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px var(--accordion-inset-local);
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 10%, transparent), color-mix(in srgb, var(--accent-2) 10%, transparent) 76%, transparent);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  user-select: none;
  list-style: none;
  border-bottom: 1px solid transparent;
  position: relative;
  z-index: 1;
}

.accordion > summary::after {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 3px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 92%, transparent), color-mix(in srgb, var(--accent-2) 82%, transparent));
  opacity: 0.92;
  border-radius: 0 3px 3px 0;
  pointer-events: none;
}

.accordion[open] > summary {
  border-bottom-color: color-mix(in srgb, var(--text) 12%, transparent);
}

/* Hide default marker and draw our own caret (triangle). */
.accordion > summary::-webkit-details-marker { display: none; }
.accordion > summary::before {
  content: "";
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
}

.accordion[open] > summary::before {
  transform: rotate(45deg);
}

.accordion > summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
  border-radius: 8px;
}

.accordion > :not(summary) {
  margin-left: var(--accordion-inset-local);
  margin-right: var(--accordion-inset-local);
  position: relative;
  z-index: 1;
}

.accordion > summary + :not(summary) {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid color-mix(in srgb, var(--text) 10%, transparent);
}

.accordion > :last-child {
  margin-bottom: 12px;
}

.panel.side .accordion:last-of-type {
  margin-bottom: 0;
}

.panel.process {
  justify-self: start;
  width: 100%;
}

.panel.pairing {
  justify-self: end;
  width: 100%;
}

.side-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0 0 12px;
  border-bottom: 1px solid var(--border);
}

.tab {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel-solid) 92%, transparent);
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
}

.tab.active {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--accent-soft);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-soft) 84%, transparent);
}

.tab:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.tab-panel.hidden {
  display: none;
}

.hidden {
  display: none !important;
}

.panel.side {
  /* Make the left panel behave like a sidebar: scroll internally on zoom-in. */
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 84px);
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-gutter: stable;
  padding-right: 24px;
}

.panel.side.is-collapsed {
  padding: 10px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
}

.panel.side.is-collapsed > :not(h2):not(.side-collapse-btn) {
  display: none !important;
}

.panel.side.is-collapsed .side-collapse-btn {
  position: static;
  margin: 2px auto 8px;
}

.panel.side.is-collapsed h2 {
  margin: 8px 0 0;
  padding-right: 0;
  min-height: 0;
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  letter-spacing: 0.06em;
  font-size: 15px;
  text-align: center;
  user-select: none;
}

.layout.left-collapsed #layout-splitter,
.layout.right-collapsed #layout-splitter-right {
  pointer-events: none;
  cursor: default;
  opacity: 0.4;
}

.layout.left-collapsed #layout-splitter::before,
.layout.right-collapsed #layout-splitter-right::before {
  background: color-mix(in srgb, var(--border) 70%, transparent);
}

.panel.side.compact {
  padding: 14px 12px;
}

.panel.side.compact .accordion {
  --accordion-inset-local: var(--accordion-inset-compact);
  margin-bottom: 8px;
}

.panel.side.compact .accordion > summary {
  min-height: 42px;
  padding: 9px 10px;
}

.panel.side.compact .accordion > :not(summary) {
  margin-left: var(--accordion-inset-local);
  margin-right: var(--accordion-inset-local);
}

.panel.side.compact .accordion > summary + :not(summary) {
  margin-top: 8px;
  padding-top: 10px;
}

.panel.side.compact .accordion > :last-child {
  margin-bottom: 9px;
}

.panel.side.compact .field {
  margin-bottom: 8px;
  gap: 3px;
}

.panel.side.compact .field span,
.panel.side.compact .hint,
.panel.side.compact .toggle,
.panel.side.compact .stat {
  font-size: 11px;
  line-height: 1.32;
  letter-spacing: 0.01em;
}

.panel.side.compact .grid {
  gap: 7px;
}

.panel.side.compact .toggle {
  grid-template-columns: 12px minmax(0, 1fr);
  column-gap: 5px;
  row-gap: 1px;
  padding: 0;
}

.panel.side.compact .toggle input {
  width: 12px;
  height: 12px;
  min-width: 12px;
  margin-top: 1px;
}

.panel.side.compact .toolbar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(116px, 1fr));
  gap: 8px;
}

.panel.side.compact .toolbar > * {
  min-width: 0;
}

.panel.side.compact .toolbar button {
  white-space: normal;
  line-height: 1.24;
  padding: 7px 10px;
}

#tab-export h3 {
  margin: 14px 0 8px;
}

#tab-export .grid.two,
#tab-export .grid.three {
  grid-template-columns: 1fr;
  gap: 6px;
}

#tab-export .field {
  margin-bottom: 8px;
}

#tab-export .toggle {
  padding: 1px 0;
}

#tab-export .toolbar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 8px;
}

#tab-export .toolbar > * {
  min-width: 0;
}

#tab-export .toolbar button {
  width: 100%;
  white-space: normal;
}

#tab-export .toolbar .toggle {
  align-items: center;
}

.panel.side .side-tabs {
  position: sticky;
  top: 0;
  z-index: 2;
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel) 98%, transparent), color-mix(in srgb, var(--panel-2) 95%, transparent));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--text) 8%, transparent);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
  min-width: 0;
}

.field span {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35;
}

input, select, button {
  font-family: inherit;
}

input:not([type="checkbox"]):not([type="radio"]),
select {
  background: var(--control-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  width: 100%;
  min-width: 0;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

input:not([type="checkbox"]):not([type="radio"]):focus,
select:focus {
  border-color: color-mix(in srgb, var(--accent) 44%, transparent);
  box-shadow: 0 0 0 3px var(--control-focus);
}

input:not([type="checkbox"]):not([type="radio"]):focus-visible,
select:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

input:not([type="checkbox"]):not([type="radio"]).invalid,
select.invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(255, 77, 109, 0.12);
}

.grid {
  display: grid;
  gap: 10px;
}

/* Use minmax(0, 1fr) so form controls can shrink without overflowing the panel. */
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* When a panel becomes narrow (e.g. browser zoom-in), collapse multi-column forms to 1 column. */
@container (max-width: 520px) {
  .grid.two { grid-template-columns: 1fr; }
  .grid.three { grid-template-columns: 1fr; }
  .export-actions { grid-template-columns: 1fr; }
}

@container (max-width: 640px) {
  .panel.side .grid.three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.toolbar button {
  white-space: nowrap;
}

.toggle {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  align-items: start;
  column-gap: 8px;
  row-gap: 1px;
  font-size: 12px;
  color: var(--muted);
  padding: 2px 0;
  line-height: 1.35;
}

.toggle input {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  margin: 2px 0 0;
  min-width: 14px;
}

.ghost {
  border: 1px solid var(--border);
  background: var(--ghost-bg);
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.ghost:hover {
  border-color: color-mix(in srgb, var(--text) 24%, transparent);
  background: var(--ghost-hover-bg);
}

.ghost:active {
  transform: translateY(1px);
}

button:disabled,
input:disabled,
select:disabled {
  cursor: not-allowed;
}

button:disabled {
  border-color: var(--disabled-border);
  background: var(--disabled-bg);
  color: var(--disabled-text);
  box-shadow: none;
  transform: none;
}

#run-all {
  border-color: color-mix(in srgb, var(--danger) 60%, var(--border));
  background: color-mix(in srgb, var(--danger) 15%, var(--panel-solid));
  color: color-mix(in srgb, var(--text) 94%, var(--danger));
}

#run-all:hover {
  border-color: color-mix(in srgb, var(--danger) 82%, var(--border));
  background: color-mix(in srgb, var(--danger) 24%, transparent);
}

#run-all:disabled {
  opacity: 0.72;
}

.primary {
  width: 100%;
  padding: 12px 16px;
  border: none;
  border-radius: calc(var(--radius-sm) + 2px);
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent-2) 86%, white), color-mix(in srgb, var(--accent) 80%, white));
  color: rgba(9, 10, 12, 0.92);
  font-weight: 700;
  cursor: pointer;
  box-shadow:
    0 12px 28px color-mix(in srgb, var(--accent-2) 20%, transparent),
    0 10px 22px color-mix(in srgb, var(--accent) 16%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.24);
  transition: transform 0.15s ease, filter 0.15s ease;
}

.primary:hover { transform: translateY(-1px); filter: saturate(1.05); }
.primary:active { transform: translateY(1px); }

.hint {
  color: var(--muted-2);
  font-size: 12px;
  line-height: 1.36;
}

.virtual-spacer {
  height: 0;
  margin: 0;
  padding: 0;
  border: 0;
  pointer-events: none;
}

.file-list {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  background: var(--panel-soft);
  max-height: 160px;
  overflow: auto;
  font-size: 12px;
  min-width: 0;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 6px;
  min-height: 34px;
  border-bottom: 1px dashed color-mix(in srgb, var(--text) 9%, transparent);
  border-radius: 10px;
  transition: background 0.12s ease;
}

.file-item span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1 1 auto;
  padding-right: 10px;
}

.file-item:hover {
  background: color-mix(in srgb, var(--text) 5%, transparent);
}

.file-item.selected {
  background: var(--selection-bg);
}

.file-item.used {
  color: var(--muted);
}

.file-item:last-child { border-bottom: none; }

.file-item small {
  color: var(--muted);
  flex: 0 0 auto;
}

.pair-table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: auto;
  background: var(--panel-soft);
  max-height: 360px;
  min-width: 0;
}

.pair-table-wrap:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.pair-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.pair-table th,
.pair-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid color-mix(in srgb, var(--text) 9%, transparent);
  white-space: nowrap;
  vertical-align: middle;
}

.pair-table .virtual-spacer-row > td {
  padding: 0 !important;
  border-bottom: 0;
  line-height: 0;
  background: transparent;
}

.pair-table tr.selected {
  background: var(--accent-soft);
}

.pair-table td.drop-target {
  outline: 1px dashed var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 74%, transparent);
}

.results .summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
  min-width: 0;
}

.export {
  margin-bottom: 16px;
}

.export h3 {
  margin: 0 0 8px;
  font-size: 12px;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.11em;
  color: var(--muted);
  line-height: 1.35;
}

.export-grid {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.export-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  min-width: 0;
}

.summary-card {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--text) 7%, transparent);
  min-width: 0;
}

.summary-card h3 {
  margin: 0 0 8px;
  font-size: 12px;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.11em;
  color: var(--muted);
  line-height: 1.35;
}

.stat {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
  line-height: 1.35;
  min-width: 0;
}

.stat span { min-width: 0; }
.stat strong { color: var(--text); min-width: 0; }

.stat.long strong {
  max-width: 65%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: right;
}

.plot {
  /* Main plot panels (TH / SA) need enough vertical room for 3x2 subplots. */
  min-height: clamp(320px, 40vh, 560px);
  margin-bottom: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--plot-bg);
  min-width: 0;
}

.plot-shell {
  margin-bottom: 16px;
}

.plot-shell .plot {
  margin-bottom: 0;
}

.plot-size-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 8px;
}

.plot-size-label {
  margin-right: auto;
  font-size: 12px;
  color: var(--muted);
  font-variant-caps: all-small-caps;
  letter-spacing: 0.08em;
  line-height: 1.35;
}

.plot-size-btn {
  width: auto;
  min-width: 34px;
  padding: 6px 10px;
  font-size: 12px;
  line-height: 1.2;
  border-radius: 10px;
}

.plot-size-btn[data-plot-size="reset"] {
  min-width: 56px;
}

.plot.plot-resizable {
  resize: vertical;
  overflow: hidden;
  position: relative;
}

.plot.plot-resizable::after {
  content: "↕";
  position: absolute;
  right: 8px;
  bottom: 6px;
  font-size: 11px;
  color: var(--muted-2);
  pointer-events: none;
  opacity: 0.75;
}

.plot.plot-resizable::after {
  content: "\2195";
}

#plot-profiles {
  min-height: clamp(520px, 62vh, 920px);
}

#plot-profiles.is-empty {
  display: none;
}

.preview {
  margin-bottom: 16px;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

.preview-header h3 {
  margin: 0;
  font-size: 13px;
  color: var(--text);
}

.preview-plot {
  /* Smaller than main plots, but still readable. */
  min-height: clamp(220px, 26vh, 360px);
}

.modal .preview-plot {
  min-height: 200px;
  margin-top: 10px;
}

.log {
  background: var(--panel-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  color: var(--muted-2);
  font-size: 12px;
  max-height: 160px;
  overflow: auto;
  /* Prevent long paths/tracebacks from forcing the right column wider. */
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.modal {
  position: fixed;
  inset: 0;
  background: var(--modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.modal.hidden {
  display: none;
}

.modal-card {
  width: min(960px, 100%);
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.modal-header h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 760;
  letter-spacing: -0.01em;
}

.modal-file {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--muted);
}

.modal-actions {
  margin-top: 12px;
  display: flex;
  justify-content: flex-end;
}

.preview-table {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: auto;
  max-height: 220px;
  background: var(--panel-soft);
  font-size: 12px;
}

.preview-table table {
  width: 100%;
  border-collapse: collapse;
}

.preview-table th,
.preview-table td {
  padding: 6px 8px;
  border-bottom: 1px solid color-mix(in srgb, var(--text) 9%, transparent);
  text-align: left;
  white-space: nowrap;
}

.preview-table th {
  position: sticky;
  top: 0;
  background: var(--panel-solid);
  z-index: 1;
  color: var(--muted);
}

.preview-table .col-time {
  background: var(--accent-soft);
}

.preview-table .col-acc {
  background: var(--accent-2-soft);
}

.panel.side,
.file-list,
.pair-table-wrap,
.log,
.preview-table,
.design-table-wrap {
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

.panel.side::-webkit-scrollbar,
.file-list::-webkit-scrollbar,
.pair-table-wrap::-webkit-scrollbar,
.log::-webkit-scrollbar,
.preview-table::-webkit-scrollbar,
.design-table-wrap::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.panel.side::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.panel.side::-webkit-scrollbar-track,
.file-list::-webkit-scrollbar-track,
.pair-table-wrap::-webkit-scrollbar-track,
.log::-webkit-scrollbar-track,
.preview-table::-webkit-scrollbar-track,
.design-table-wrap::-webkit-scrollbar-track {
  background: var(--scroll-track);
}

.panel.side::-webkit-scrollbar-thumb,
.file-list::-webkit-scrollbar-thumb,
.pair-table-wrap::-webkit-scrollbar-thumb,
.log::-webkit-scrollbar-thumb,
.preview-table::-webkit-scrollbar-thumb,
.design-table-wrap::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.panel.side::-webkit-scrollbar-thumb:hover,
.file-list::-webkit-scrollbar-thumb:hover,
.pair-table-wrap::-webkit-scrollbar-thumb:hover,
.log::-webkit-scrollbar-thumb:hover,
.preview-table::-webkit-scrollbar-thumb:hover,
.design-table-wrap::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
}

.design-table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: auto;
  max-height: 320px;
  background: var(--panel-soft);
}

.design-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.design-table th,
.design-table td {
  padding: 6px 8px;
  border-bottom: 1px solid color-mix(in srgb, var(--text) 9%, transparent);
  text-align: left;
  white-space: nowrap;
  vertical-align: middle;
}

.design-table th {
  position: sticky;
  top: 0;
  background: var(--panel-solid);
  z-index: 1;
  color: var(--muted);
}

.design-table input,
.design-table select {
  width: 100%;
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
}

.design-table input[type="color"] {
  padding: 0;
  height: 32px;
  border-radius: 8px;
}

.design-table .btn-cell {
  width: 1%;
}

.design-table .btn-remove {
  padding: 6px 10px;
}

@media (prefers-reduced-motion: no-preference) {
  .hero {
    animation: ds-rise-in 640ms cubic-bezier(0.2, 0.9, 0.2, 1) both;
  }

  .panel.process { animation: ds-rise-in 640ms cubic-bezier(0.2, 0.9, 0.2, 1) both; animation-delay: 50ms; }
  .panel.results { animation: ds-rise-in 640ms cubic-bezier(0.2, 0.9, 0.2, 1) both; animation-delay: 110ms; }
  .panel.pairing { animation: ds-rise-in 640ms cubic-bezier(0.2, 0.9, 0.2, 1) both; animation-delay: 170ms; }

  .dot[data-state="ok"]::after {
    animation: ds-pulse 1.6s ease-in-out infinite;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-wave__scan { animation: none; }
  .ghost, .primary, input, select { transition: none !important; }
}

@keyframes ds-rise-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes ds-pulse {
  0%, 100% { transform: scale(0.95); opacity: 0.28; }
  50% { transform: scale(1.28); opacity: 0.58; }
}

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .hero-actions {
    justify-self: start;
    flex-wrap: wrap;
  }
  .hero-wave {
    left: 14px;
    right: 14px;
    height: 38px;
    bottom: 6px;
  }
  .layout,
  .layout.left-collapsed,
  .layout.right-collapsed,
  .layout.left-collapsed.right-collapsed { grid-template-columns: 1fr; }
  .splitter { display: none; }
  .results .summary { grid-template-columns: 1fr; }
  .panel.side {
    position: static;
    max-height: none;
    overflow: visible;
  }
  .panel.side.is-collapsed {
    display: block;
    padding: 20px;
  }
  .panel.side.is-collapsed > :not(h2):not(.side-collapse-btn) {
    display: block !important;
  }
  .panel.side.is-collapsed .side-collapse-btn {
    position: absolute;
    margin: 0;
  }
  .panel.side.is-collapsed h2 {
    writing-mode: horizontal-tb;
    transform: none;
    margin: 0 0 14px;
    letter-spacing: -0.01em;
    font-size: 18px;
    text-align: left;
  }
  .side-collapse-btn {
    display: none;
  }
  .panel.side .side-tabs {
    position: static;
    backdrop-filter: none;
  }
  .plot-size-controls {
    flex-wrap: wrap;
  }
  .plot-size-label {
    flex: 1 0 100%;
    margin-right: 0;
  }
  .plot.plot-resizable {
    resize: none;
  }
}