:root {
  color-scheme: light;
  --bg: #f4efe6;
  --paper: rgba(255, 252, 247, 0.84);
  --ink: #171311;
  --muted: #645951;
  --line: rgba(23, 19, 17, 0.08);
  --accent: #c3532b;
  --accent-strong: #973415;
  --accent-soft: rgba(195, 83, 43, 0.14);
  --success: #215c49;
  --warning: #946525;
  --danger: #9c2f2f;
  --shadow: 0 24px 70px rgba(75, 47, 30, 0.14);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 12px;
  --font-heading: "Avenir Next", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --font-body: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at top right, rgba(195, 83, 43, 0.18), transparent 24%),
    radial-gradient(circle at bottom left, rgba(33, 92, 73, 0.14), transparent 22%),
    linear-gradient(180deg, #f7f1e9 0%, #efe7dd 100%);
  color: var(--ink);
  font-family: var(--font-body);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 19, 17, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 19, 17, 0.03) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.28), transparent 75%);
}

.page-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 24px;
  padding: 24px;
  min-height: 100vh;
}

.control-panel,
.stage-panel {
  position: relative;
  z-index: 1;
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel-header,
.card,
.stage-card,
.stage-header {
  backdrop-filter: blur(18px);
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.56);
  box-shadow: var(--shadow);
}

.panel-header,
.card {
  border-radius: var(--radius-xl);
  padding: 22px;
}

.stage-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 18px;
}

.stage-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  border-radius: var(--radius-xl);
  padding: 22px 24px;
}

.stage-card {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 640px;
  border-radius: 34px;
  padding: 18px;
  overflow: hidden;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

h1,
h2 {
  margin: 0;
  font-family: var(--font-heading);
  line-height: 1.05;
}

h1 {
  font-size: clamp(1.9rem, 2.4vw, 2.8rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: 1.05rem;
  letter-spacing: -0.03em;
}

.panel-copy,
.hint-list,
.status-text,
.canvas-caption,
.card p {
  color: var(--muted);
  line-height: 1.6;
}

.panel-copy {
  margin: 12px 0 0;
}

.card {
  display: grid;
  gap: 14px;
}

.details-card {
  gap: 0;
  padding: 0;
  overflow: hidden;
}

.details-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
}

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

.details-card summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--accent-strong);
  font-size: 1.1rem;
}

.details-card[open] summary::after {
  content: "-";
}

.summary-copy {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
}

.details-body {
  display: grid;
  gap: 14px;
  padding: 0 22px 22px;
  border-top: 1px solid var(--line);
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.segment-button {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
  color: var(--ink);
  box-shadow: none;
}

.segment-button.active {
  border-color: rgba(195, 83, 43, 0.4);
  background: rgba(195, 83, 43, 0.12);
  color: var(--accent-strong);
}

.field-grid {
  display: grid;
  gap: 16px;
}

.file-field,
.range-field {
  display: grid;
  gap: 8px;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.check-card {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 50px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  color: var(--ink);
  font-weight: 700;
}

.check-card input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  margin: 0;
}

.file-field span,
.range-field span {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--muted);
}

input[type="file"],
select,
button,
input[type="range"] {
  width: 100%;
}

input[type="file"],
select {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  font: inherit;
  padding: 12px 14px;
}

input[type="range"] {
  accent-color: var(--accent);
}

button,
.inline-file {
  border: 0;
  border-radius: 999px;
  padding: 13px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    opacity 140ms ease;
  box-shadow: 0 16px 30px rgba(151, 52, 21, 0.18);
}

button:hover,
.inline-file:hover {
  transform: translateY(-1px);
}

button:disabled,
.inline-file:has(input:disabled) {
  cursor: not-allowed;
  opacity: 0.56;
  transform: none;
}

.ghost-button,
.inline-file {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 19, 17, 0.08);
  box-shadow: none;
}

.danger {
  color: var(--danger);
}

.button-stack {
  display: grid;
  gap: 10px;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.inline-status {
  display: grid;
  gap: 8px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: rgba(23, 19, 17, 0.04);
}

.inline-file {
  position: relative;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.inline-file input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.hint-list {
  display: grid;
  gap: 4px;
  margin: 0;
  font-size: 0.92rem;
}

.status-text.compact {
  margin: 0;
  font-size: 0.92rem;
}

.metric-row,
.list-header,
.video-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.metric-row {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.detector-header {
  align-items: flex-start;
}

.detector-chip-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.metric-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: rgba(23, 19, 17, 0.06);
  color: var(--ink);
}

.metric-chip.neutral {
  background: rgba(23, 19, 17, 0.06);
}

.metric-chip.success {
  background: rgba(33, 92, 73, 0.14);
  color: var(--success);
}

.metric-chip.warning {
  background: rgba(148, 101, 37, 0.14);
  color: var(--warning);
}

.metric-chip.danger {
  background: rgba(156, 47, 47, 0.14);
  color: var(--danger);
}

.seek-field {
  gap: 10px;
}

.timeline-panel {
  display: grid;
  gap: 10px;
  padding-top: 6px;
}

.timeline-panel h3 {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.timeline-actions,
.timeline-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.timeline-chip-list.empty {
  padding: 14px;
  border-radius: var(--radius-md);
  background: rgba(23, 19, 17, 0.04);
  color: var(--muted);
  font-size: 0.9rem;
}

.timeline-chip {
  min-width: auto;
  padding: 0 10px;
}

.timeline-chip.active {
  background: rgba(195, 83, 43, 0.16);
  color: var(--accent-strong);
}

#preview-canvas {
  width: 100%;
  height: 100%;
  min-height: 520px;
  display: block;
  border-radius: 24px;
  background:
    linear-gradient(45deg, rgba(23, 19, 17, 0.06) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(23, 19, 17, 0.06) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(23, 19, 17, 0.06) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(23, 19, 17, 0.06) 75%);
  background-size: 30px 30px;
  background-position:
    0 0,
    0 15px,
    15px -15px,
    -15px 0;
  touch-action: none;
}

.canvas-caption {
  display: grid;
  gap: 2px;
  padding: 14px 6px 0;
  font-size: 0.88rem;
}

.mask-list {
  display: grid;
  gap: 10px;
}

.mask-list.empty {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(23, 19, 17, 0.04);
  color: var(--muted);
}

.mask-row {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(23, 19, 17, 0.06);
}

.mask-row.active {
  outline: 2px solid rgba(195, 83, 43, 0.28);
}

.mask-row.auto {
  background: rgba(195, 83, 43, 0.08);
}

.mask-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.mask-summary {
  font-size: 0.9rem;
  color: var(--muted);
}

.mask-actions {
  display: flex;
  gap: 8px;
}

.mini-button {
  padding: 8px 10px;
  font-size: 0.82rem;
}

kbd {
  display: inline-flex;
  align-items: center;
  min-width: 1.9em;
  justify-content: center;
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid rgba(23, 19, 17, 0.12);
  background: rgba(255, 255, 255, 0.75);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
}

@media (max-width: 1080px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .button-grid {
    grid-template-columns: 1fr;
  }

  .segmented-control {
    grid-template-columns: 1fr 1fr;
  }

  .stage-card {
    min-height: 520px;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding: 14px;
    gap: 14px;
  }

  .panel-header,
  .card,
  .stage-header,
  .stage-card {
    border-radius: 22px;
  }

  .panel-header,
  .card,
  .stage-header {
    padding: 18px;
  }

  .stage-card {
    min-height: 420px;
    padding: 12px;
  }

  #preview-canvas {
    min-height: 360px;
  }

  .checkbox-grid {
    grid-template-columns: 1fr;
  }

  .segmented-control {
    grid-template-columns: 1fr;
  }

  .metric-row,
  .list-header,
  .video-toolbar,
  .details-card summary {
    flex-direction: column;
    align-items: stretch;
  }
}