/* ── twilight-garden design system ─────────────────────────── *
 * Palette: deep forest canvas, slate-blue calm, dusty-rose
 * tension, lilac trace, gray-sage supporting text.             */
:root {
  --canvas:        #151d10;
  --canvas-deep:   #10160c;
  --surface:       #1d2816;
  --surface-solid: #222e1a;
  --ink:           #e9ede2;
  --ink-soft:      #9aa794;
  --mirror:        #0f150b;
  --mirror-raised: #171f11;
  --mirror-ink:    #eef1e9;
  --mirror-soft:   #a9b3a1;
  --calm:          #7d97bf;
  --calm-bright:   #a3b8d9;
  --ember:         #c795b2;
  --ember-bright:  #e7c7d7;
  --trace:         #a795cb;
  --line:          rgba(233, 237, 226, 0.10);
  --line-strong:   rgba(233, 237, 226, 0.20);
  --mirror-line:   rgba(238, 241, 233, 0.15);
  --accent:        var(--calm);

  --font-display: 'Gambarino', 'Iowan Old Style', Georgia, serif;
  --font-body:    'Switzer', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    'Spline Sans Mono', ui-monospace, 'SF Mono', monospace;
  --page-width:   1180px;
}

* { box-sizing: border-box; }

html {
  color-scheme: dark;
  background: var(--canvas);
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  background-color: var(--canvas);
  background-image:
    linear-gradient(rgba(233, 237, 226, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 237, 226, 0.028) 1px, transparent 1px);
  background-size: 24px 24px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input,
summary { font: inherit; }

button,
summary { -webkit-tap-highlight-color: transparent; }

button { cursor: pointer; }

button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px var(--surface-solid);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.hidden { display: none !important; }

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

/* ── masthead ──────────────────────────────────────────────── */
.top {
  position: relative;
  z-index: 20;
  width: min(var(--page-width), calc(100% - 48px));
  margin: 0 auto;
  padding: 26px 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: max-content;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 31px;
  line-height: 1;
  letter-spacing: -0.025em;
}

.wordmark .beta {
  margin-left: 9px;
  padding: 2px 6px 3px;
  border: 1px solid color-mix(in oklab, var(--accent) 65%, transparent);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  vertical-align: 5px;
  transition: color 450ms ease, border-color 450ms ease;
}

.brand-line {
  padding-left: 18px;
  border-left: 1px solid var(--line-strong);
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.ghost,
.preferences > summary {
  min-height: 40px;
  padding: 7px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: color-mix(in oklab, var(--surface) 72%, transparent);
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 600;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.ghost:hover:not(:disabled),
.preferences > summary:hover {
  border-color: color-mix(in oklab, var(--calm) 42%, var(--line-strong));
  background: var(--surface);
  color: var(--ink);
  transform: translateY(-1px);
}

.ghost:disabled {
  cursor: default;
  opacity: 0.42;
  transform: none;
}

.recalibrate:not(:disabled) {
  border-color: var(--calm);
  color: var(--calm);
}

.stop-camera:hover { border-color: color-mix(in oklab, var(--ember) 55%, var(--line)); }

.preferences { position: relative; }

.preferences > summary {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.preferences > summary::-webkit-details-marker { display: none; }

.preferences > summary::after {
  width: 5px;
  height: 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  content: '';
  transform: rotate(45deg) translateY(-2px);
  transition: transform 160ms ease;
}

.preferences[open] > summary::after { transform: rotate(225deg) translate(-1px, -1px); }

.preferences-menu {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  width: min(316px, calc(100vw - 30px));
  padding: 9px;
  display: grid;
  gap: 4px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--surface-solid);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
}

.preference-group {
  padding: 8px 8px 10px;
  border-bottom: 1px solid var(--line);
}

.preference-label {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 600;
}

.sensitivity-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
}

.sensitivity-option {
  min-width: 0;
  min-height: 34px;
  padding: 7px 5px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 600;
}

.sensitivity-option:last-child { border-right: 0; }

.sensitivity-option:hover {
  background: color-mix(in oklab, var(--canvas) 58%, transparent);
  color: var(--ink);
}

.sensitivity-option[aria-pressed='true'] {
  background: color-mix(in oklab, var(--calm) 20%, var(--canvas));
  color: var(--calm-bright);
}

.sensitivity-option:focus-visible {
  position: relative;
  z-index: 1;
  outline: 2px solid var(--ink);
  outline-offset: -3px;
  box-shadow: none;
}

#sensitivity-help {
  margin: 7px 0 0;
  color: var(--ink-soft);
  font-size: 10px;
  line-height: 1.4;
}

.setting {
  position: relative;
  width: 100%;
  padding: 9px 34px 9px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--ink-soft);
  text-align: left;
  font-size: 12px;
  font-weight: 600;
}

.setting:hover { background: var(--canvas); color: var(--ink); }
.setting:disabled { cursor: not-allowed; opacity: 0.55; }

.setting.toggle::after {
  position: absolute;
  top: 50%;
  right: 11px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
  content: '';
  transform: translateY(-50%);
}

.setting.toggle[aria-pressed='true'] { color: var(--calm); }

.setting.toggle[aria-pressed='true']::after {
  border-color: var(--calm);
  background: var(--calm);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--calm) 15%, transparent);
}

/* ── primary layout ────────────────────────────────────────── */
main {
  flex: 1;
  width: min(var(--page-width), calc(100% - 48px));
  margin: 0 auto;
  padding-bottom: 24px;
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 278px;
  gap: 22px;
  align-items: stretch;
}

.mirror-column { min-width: 0; }

.mirror-wrap {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border-radius: 18px;
  background: var(--mirror);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.05),
    0 24px 60px rgba(0, 0, 0, 0.5);
}

#video,
#overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: scaleX(-1);
}

#video {
  object-fit: cover;
  background: var(--mirror);
  filter: saturate(0.82) contrast(1.02);
}

#overlay { pointer-events: none; }
#overlay { object-fit: cover; }

.rim {
  position: absolute;
  z-index: 4;
  inset: 0;
  border: 1px solid var(--mirror-line);
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 0 0 0 transparent;
  transition: border-color 450ms ease, box-shadow 450ms ease;
}

body[data-state='frowning'] .rim {
  border-color: var(--ember-bright);
  box-shadow: inset 0 0 58px -24px var(--ember-bright);
}

body[data-state='calibrating'] .rim,
body[data-state='relaxed'] .rim {
  border-color: color-mix(in oklab, var(--calm-bright) 58%, transparent);
}

/* The two responsive arcs are the product's signature browline. */
.brow-signal {
  position: absolute;
  z-index: 6;
  top: 18px;
  left: 50%;
  width: 116px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  color: var(--calm-bright);
  opacity: 0.82;
  transform: translateX(-50%);
  transition: color 400ms ease, opacity 400ms ease;
  pointer-events: none;
}

.brow-signal i {
  width: 41px;
  height: 15px;
  border-top: 2px solid currentColor;
  border-radius: 50% 50% 0 0;
  transition: transform 450ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.brow-signal span {
  width: 2px;
  height: 8px;
  border-radius: 2px;
  background: currentColor;
  opacity: 0.45;
  transform: translateY(-5px);
}

body[data-state='frowning'] .brow-signal { color: var(--ember-bright); opacity: 1; }
body[data-state='frowning'] .brow-signal i:first-child { transform: rotate(12deg) translateX(2px); }
body[data-state='frowning'] .brow-signal i:last-child { transform: rotate(-12deg) translateX(-2px); }

/* ── mirror veils ──────────────────────────────────────────── */
.veil {
  position: absolute;
  z-index: 5;
  inset: 0;
  display: flex;
  flex-direction: column;
  color: var(--mirror-ink);
  background: rgba(11, 15, 8, 0.76);
  backdrop-filter: blur(10px);
}

.start-veil {
  align-items: flex-start;
  justify-content: flex-end;
  gap: 15px;
  padding: clamp(34px, 6vw, 68px);
  padding-right: clamp(34px, 10vw, 112px);
  background:
    linear-gradient(100deg, rgba(11, 15, 8, 0.94) 4%, rgba(11, 15, 8, 0.74) 58%, rgba(11, 15, 8, 0.55)),
    radial-gradient(circle at 78% 22%, rgba(167, 149, 203, 0.15), transparent 36%);
  text-align: left;
}

.overline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--calm-bright);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.overline i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px color-mix(in oklab, currentColor 13%, transparent);
}

.veil h1,
.veil h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.025em;
}

.veil h1 {
  max-width: 15ch;
  font-size: clamp(36px, 5.2vw, 62px);
  line-height: 0.98;
}

.veil h2 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.05;
}

.veil p {
  max-width: 53ch;
  margin: 0;
  color: var(--mirror-soft);
  font-size: clamp(14px, 1.4vw, 16px);
}

.start-action {
  margin-top: 5px;
  display: flex;
  align-items: center;
  gap: 15px;
}

.primary {
  min-height: 45px;
  padding: 11px 19px;
  border: 1px solid var(--mirror-ink);
  border-radius: 8px;
  background: var(--mirror-ink);
  color: var(--mirror);
  font-size: 13px;
  font-weight: 600;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.primary:hover:not(:disabled) {
  background: var(--calm-bright);
  border-color: var(--calm-bright);
  transform: translateY(-1px);
}

.primary:disabled { cursor: wait; opacity: 0.72; }

.start-action small,
.calibration-veil small {
  max-width: 28ch;
  color: var(--mirror-soft);
  font-size: 11px;
  line-height: 1.45;
}

.calibration-veil {
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 52px 32px 32px;
  text-align: center;
}

.calibration-veil .overline { margin-bottom: 2px; }
.calibration-veil p { max-width: 44ch; }

.summary-veil {
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 46px 32px 32px;
  background:
    radial-gradient(circle at 50% 42%, rgba(125, 151, 191, 0.13), transparent 34%),
    rgba(11, 15, 8, 0.86);
  text-align: center;
}

.summary-veil p { max-width: 38ch; }
.summary-veil .primary { margin-top: 4px; }

#calib-scope {
  width: min(340px, 82%);
  height: 72px;
  margin-top: 6px;
  border: 1px solid var(--mirror-line);
  border-radius: 8px;
  background: rgba(13, 18, 10, 0.62);
}

.calib-progress {
  width: min(340px, 82%);
  height: 4px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--mirror-line);
}

#calib-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--calm-bright);
  transition: width 180ms linear;
}

.banner {
  position: absolute;
  z-index: 8;
  left: 50%;
  bottom: 22px;
  max-width: calc(100% - 32px);
  padding: 11px 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid color-mix(in oklab, var(--ember-bright) 72%, transparent);
  border-radius: 999px;
  background: color-mix(in oklab, var(--mirror) 82%, var(--ember-bright));
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.26);
  color: var(--mirror-ink);
  font-size: 14px;
  white-space: nowrap;
  transform: translateX(-50%);
  animation: settle 300ms ease-out;
}

.banner-mark {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--ember-bright);
}

.banner-action {
  min-height: 28px;
  margin: -4px -7px -4px 2px;
  padding: 4px 9px;
  border: 1px solid color-mix(in oklab, var(--ember-bright) 42%, transparent);
  border-radius: 999px;
  background: transparent;
  color: var(--ember-bright);
  font-size: 11px;
  font-weight: 600;
}

.banner-action:hover {
  border-color: var(--ember-bright);
  background: color-mix(in oklab, var(--ember-bright) 12%, transparent);
}

@keyframes settle {
  from { opacity: 0; transform: translate(-50%, 7px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.mirror-caption {
  padding: 10px 4px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--ink-soft);
  font-size: 11px;
}

.mirror-caption > span:first-child {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--ink);
  font-weight: 600;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 14%, transparent);
  transition: background 450ms ease, box-shadow 450ms ease;
}

body[data-state='paused'] .status-dot {
  background: var(--ink-soft);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--ink-soft) 12%, transparent);
}

/* ── instrument rail ───────────────────────────────────────── */
.readout {
  min-width: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: color-mix(in oklab, var(--surface) 86%, transparent);
}

.cell {
  padding: 18px 19px;
  border-bottom: 1px solid var(--line);
}

.cell-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.label {
  display: block;
  margin: 0;
  color: var(--ink-soft);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.state {
  padding: 2px 7px 3px;
  border: 1px solid color-mix(in oklab, var(--accent) 34%, transparent);
  border-radius: 999px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: lowercase;
  transition: color 450ms ease, border-color 450ms ease;
}

.signal-card .value {
  display: block;
  margin: 15px 0 16px;
  color: var(--accent);
  font-family: var(--font-display);
  font-size: clamp(34px, 3.5vw, 44px);
  line-height: 1;
  letter-spacing: -0.025em;
  transition: color 450ms ease;
}

.signal-card:focus {
  position: relative;
  z-index: 1;
  outline: 3px solid var(--ink);
  outline-offset: -3px;
}

.meter {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--canvas-deep) 72%, var(--surface));
}

.meter-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 120ms linear, background 450ms ease;
}

.notch {
  position: absolute;
  top: -3px;
  width: 2px;
  height: 14px;
  border-radius: 2px;
}

.notch-base { background: var(--ink-soft); }
.notch-enter { background: var(--ember); }

.meter-legend {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  color: var(--ink-soft);
  font-size: 9px;
}

.meter-legend span:nth-child(2) { text-align: center; }
.meter-legend span:last-child { text-align: right; }

.cell-note {
  margin: 15px 0 0;
  padding-top: 13px;
  border-top: 1px dashed var(--line);
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.45;
}

.debug div {
  min-height: 30px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.debug {
  margin-top: 16px;
  padding: 14px;
  border-top: 1px dashed var(--line);
  background: color-mix(in oklab, var(--canvas) 34%, transparent);
  font-size: 11px;
}

.debug .label { letter-spacing: 0.07em; }

body[data-state='idle'] #session-tools { display: none; }

.session-tools {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 9px;
}

.session-tools p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 10px;
  line-height: 1.45;
}

.secondary {
  min-height: 36px;
  padding: 8px 12px;
  border: 1px solid color-mix(in oklab, var(--calm) 48%, var(--line));
  border-radius: 8px;
  background: transparent;
  color: var(--calm-bright);
  font-size: 11px;
  font-weight: 600;
}

.secondary:hover {
  border-color: var(--calm);
  background: color-mix(in oklab, var(--calm) 10%, transparent);
}

.privacy-note {
  margin-top: auto;
  padding: 17px 19px;
  display: flex;
  align-items: flex-start;
  gap: 11px;
  color: var(--ink-soft);
}

.privacy-note p {
  margin: 0;
  font-size: 11px;
  line-height: 1.5;
}

.privacy-note strong { color: var(--ink); font-weight: 600; }

.privacy-icon {
  position: relative;
  width: 16px;
  height: 18px;
  flex: 0 0 auto;
  margin-top: 1px;
  border: 1.5px solid var(--calm);
  border-radius: 8px 8px 6px 6px;
}

.privacy-icon::after {
  position: absolute;
  top: 5px;
  left: 5px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--calm);
  content: '';
}

/* ── optional session detail ───────────────────────────────── */
.session-details {
  margin-top: 20px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.session-details > summary {
  min-height: 48px;
  padding: 12px 4px;
  display: flex;
  align-items: center;
  gap: 9px;
  list-style: none;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
}

.session-details > summary::-webkit-details-marker { display: none; }

.session-details > summary::before {
  width: 6px;
  height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  content: '';
  transform: rotate(-45deg);
  transition: transform 160ms ease;
}

.session-details[open] > summary::before { transform: rotate(45deg) translate(-1px, -1px); }
.session-details > summary:hover { color: var(--ink); }

.session-details > summary small {
  padding-left: 9px;
  border-left: 1px solid var(--line-strong);
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.session-details-body {
  padding: 7px 4px 13px;
  border-top: 1px solid var(--line);
}

.session-metrics {
  margin: 0;
  padding: 8px 0 17px;
  display: grid;
  grid-template-columns: max-content max-content max-content max-content;
  align-items: baseline;
  gap: 10px 18px;
}

.session-metrics dt {
  color: var(--ink-soft);
  font-size: 11px;
}

.session-metrics dd {
  margin: 0;
  margin-right: 20px;
  color: var(--ink);
  font-size: 12px;
}

.strip {
  padding: 15px 0 4px;
  overflow: hidden;
  border-top: 1px dashed var(--line);
}

.strip-head {
  margin-bottom: 9px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.strip h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.legend {
  display: flex;
  align-items: center;
  gap: 15px;
  color: var(--ink-soft);
  font-size: 10px;
}

.legend > span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.key {
  display: inline-block;
  width: 14px;
  height: 2px;
  border-radius: 2px;
}

.key-trace { background: var(--trace); }
.key-thresh { height: 1px; background: var(--ember); }
.key-mark { width: 2px; height: 10px; background: var(--ember); }

#chart {
  width: 100%;
  height: 140px;
  display: block;
}

.motion-note {
  display: none;
  margin: 10px 0 5px;
  color: var(--ink-soft);
  font-size: 12px;
}

/* ── footer ────────────────────────────────────────────────── */
footer {
  width: min(var(--page-width), calc(100% - 48px));
  margin: 0 auto;
  padding: 4px 0 22px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--ink-soft);
  font-size: 10px;
}

/* ── responsive ────────────────────────────────────────────── */
@media (max-width: 980px) {
  .stage { grid-template-columns: 1fr; }

  .readout {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
  }

  .signal-card { grid-row: span 2; border-right: 1px solid var(--line); }
  .session-tools { grid-column: 2; }
  .privacy-note { grid-column: 1 / -1; margin-top: 0; border-top: 1px solid var(--line); }
}

@media (max-width: 720px) {
  .top,
  main,
  footer { width: min(100% - 30px, var(--page-width)); }

  .top {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
    padding: 20px 0 16px;
  }

  .controls { width: 100%; justify-content: flex-start; }
  .preferences { margin-left: auto; }
  .preferences-menu { right: -15px; }

  .start-veil {
    padding: 50px 34px 34px;
    padding-right: 34px;
  }

  .start-action {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .strip-head { align-items: flex-start; flex-direction: column; }
  .legend { flex-wrap: wrap; }

  footer { flex-direction: column; gap: 4px; }
}

@media (max-width: 540px) {
  .brand-line { display: none; }
  .wordmark { font-size: 29px; }

  .controls { flex-wrap: wrap; }

  .mirror-wrap { aspect-ratio: 3 / 4; border-radius: 14px; }

  .veil h1 { font-size: clamp(38px, 13vw, 52px); }
  .start-veil { gap: 13px; padding: 54px 25px 27px; }
  .calibration-veil { padding: 54px 22px 26px; }

  .mirror-caption {
    align-items: flex-start;
    flex-direction: column;
    gap: 3px;
  }

  .readout { display: flex; }
  .signal-card { grid-row: auto; border-right: 0; }

  .banner { white-space: normal; }
}

@media (max-width: 360px) {
  .mirror-wrap { aspect-ratio: 2 / 3; }
  .start-veil { gap: 10px; padding: 42px 19px 22px; }
  .summary-veil { padding: 44px 19px 24px; }

  .session-metrics {
    grid-template-columns: 1fr max-content;
    gap: 9px;
  }

  .session-metrics dd { margin-right: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  #chart,
  #calib-scope { display: none; }

  .motion-note { display: block; }
}