:root {
  color-scheme: light;
  --bg: #f4f6fa;
  --ink: #16202f;
  --muted: #64748b;
  --line: #dde3ec;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --hover: #f1f5f9;
  --accent: #0f766e;
  --accent-soft: #e6f6f4;
  --accent-line: #99d5cd;
  --amber: #b45309;
  --amber-soft: #fff7e8;
  --amber-line: #f2d494;
  --green: #15803d;
  --green-soft: #ecfdf3;
  --green-line: #a7e3bd;
  --tag-bg: #eef1f6;
  --tag-ink: #51607a;
  --type-bg: #e8f0fd;
  --type-ink: #1d5fbf;
  --plot-bg: #e3f4f1;
  --plot-ink: #0e7268;
  --code-bg: #0f172a;
  --code-ink: #dbe4f5;
  --shadow: 0 10px 34px rgba(23, 32, 51, 0.07);
  --topbar-h: 76px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1220;
  --ink: #e2e8f2;
  --muted: #93a0b4;
  --line: #253248;
  --panel: #131c2e;
  --panel-soft: #172236;
  --hover: #1b2740;
  --accent: #2dd4bf;
  --accent-soft: #10312e;
  --accent-line: #1f6f66;
  --amber: #fbbf24;
  --amber-soft: #2c2110;
  --amber-line: #6b5220;
  --green: #4ade80;
  --green-soft: #10291a;
  --green-line: #22593a;
  --tag-bg: #212d42;
  --tag-ink: #9fb0c9;
  --type-bg: #1b2c49;
  --type-ink: #8fb8f4;
  --plot-bg: #11322f;
  --plot-ink: #55cfc0;
  --code-bg: #0d1526;
  --code-ink: #d5dff0;
  --shadow: 0 10px 34px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  transition: background 0.2s ease, color 0.2s ease;
}

body.no-scroll {
  overflow: hidden;
}

button,
input,
select {
  font: inherit;
}

kbd {
  display: inline-block;
  min-width: 18px;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--panel-soft);
  color: var(--muted);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 11px;
  text-align: center;
}

/* ---------- top bar ---------- */

.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 24px;
  background: var(--panel);
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.topbar h1 {
  margin: 2px 0 0;
  font-size: 21px;
  line-height: 1.15;
  font-weight: 750;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 5px 12px;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.project-link:hover {
  background: var(--hover);
  border-color: var(--accent);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 12.5px;
  white-space: nowrap;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-soft);
  color: var(--ink);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease;
}

.theme-toggle:hover {
  background: var(--hover);
}

/* ---------- layout ---------- */

.app-shell {
  display: grid;
  grid-template-columns: minmax(300px, 370px) minmax(0, 1fr);
  height: calc(100vh - var(--topbar-h));
  min-height: 0;
  overflow: hidden;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel);
  overflow: clip;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 12px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 650;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

label kbd {
  text-transform: none;
  margin-left: 2px;
}

label.wide {
  grid-column: 1 / -1;
}

select,
input {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  padding: 6px 10px;
  outline: none;
  font-size: 13.5px;
  font-weight: 450;
  text-transform: none;
  letter-spacing: 0;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}

select:hover,
input:hover {
  border-color: var(--accent-line);
}

select:focus,
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

/* ---------- game note ---------- */

.game-note {
  display: grid;
  gap: 3px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.5;
}

.note-path {
  color: var(--muted);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 11.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.note-meta {
  color: var(--muted);
}

.note-warn {
  color: var(--amber);
  font-weight: 600;
}

.note-ok {
  color: var(--green);
}

/* ---------- sample list ---------- */

.list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.list-header button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--accent);
  padding: 3px 9px;
  font-size: 11.5px;
  font-weight: 650;
  cursor: pointer;
  transition: background 0.12s ease;
}

.list-header button:hover {
  background: var(--accent-soft);
  border-color: var(--accent-line);
}

.sample-list {
  flex: 1;
  overflow: auto;
  padding: 8px;
  display: grid;
  gap: 4px;
  align-content: start;
}

.sample-card {
  width: 100%;
  display: grid;
  gap: 6px;
  text-align: left;
  border: 1px solid transparent;
  border-left: 3px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  padding: 10px 12px;
  cursor: pointer;
  transition: background 0.1s ease, border-color 0.1s ease;
}

.sample-card:hover {
  background: var(--hover);
}

.sample-card.active {
  background: var(--accent-soft);
  border-color: var(--accent-line);
  border-left-color: var(--accent);
}

.sample-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  font-size: 12.5px;
}

.sample-id {
  font-weight: 750;
  white-space: nowrap;
}

.sample-answer {
  color: var(--muted);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 11.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 45%;
}

.sample-card p {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mini-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.mini-tag {
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-ink);
  font-size: 11px;
  font-weight: 550;
}

.mini-tag.tag-type {
  background: var(--type-bg);
  color: var(--type-ink);
}

.mini-tag.tag-plot {
  background: var(--plot-bg);
  color: var(--plot-ink);
}

.mini-tag.tag-plot.plot-easy {
  background: var(--green-soft);
  color: var(--green);
}

.mini-tag.tag-plot.plot-medium {
  background: var(--amber-soft);
  color: var(--amber);
}

.mini-tag.tag-plot.plot-hard {
  background: #fdeaea;
  color: #b42318;
}

.mini-tag.level-easy {
  background: var(--green-soft);
  color: var(--green);
}

.mini-tag.level-medium {
  background: var(--amber-soft);
  color: var(--amber);
}

.mini-tag.level-hard {
  background: #fdeaea;
  color: #b42318;
}

:root[data-theme="dark"] .mini-tag.level-hard {
  background: #341518;
  color: #f19999;
}

:root[data-theme="dark"] .mini-tag.tag-plot.plot-hard {
  background: #341518;
  color: #f19999;
}

.sidebar-footer {
  display: flex;
  gap: 14px;
  padding: 8px 16px;
  border-top: 1px solid var(--line);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 11.5px;
}

.sidebar-footer span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ---------- workspace ---------- */

.workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(320px, 46%) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
  overflow: hidden;
}

.image-panel,
.detail-panel {
  min-width: 0;
  min-height: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.image-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.heading-text {
  min-width: 0;
}

.panel-heading h2 {
  margin: 3px 0 0;
  font-size: 17px;
  line-height: 1.3;
  font-weight: 700;
}

.panel-heading .eyebrow {
  color: var(--accent);
}

.nav-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.nav-position {
  min-width: 56px;
  text-align: center;
  color: var(--muted);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.nav-buttons button {
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-size: 15px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.nav-buttons button:hover:not(:disabled) {
  background: var(--accent-soft);
  border-color: var(--accent-line);
  color: var(--accent);
}

.nav-buttons button:disabled {
  opacity: 0.35;
  cursor: default;
}

.image-frame {
  position: relative;
  min-height: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  background:
    linear-gradient(45deg, var(--panel-soft) 25%, transparent 25%) 0 0 / 22px 22px,
    linear-gradient(45deg, transparent 75%, var(--panel-soft) 75%) 0 0 / 22px 22px,
    linear-gradient(45deg, transparent 75%, var(--panel-soft) 75%) 11px 11px / 22px 22px,
    linear-gradient(45deg, var(--panel-soft) 25%, var(--panel) 25%) 11px 11px / 22px 22px;
}

.image-frame.zoomable {
  cursor: zoom-in;
}

.image-frame img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 6px 26px rgba(10, 16, 30, 0.18);
}

.image-placeholder {
  color: var(--muted);
  font-size: 14px;
}

.image-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
}

.image-name {
  color: var(--muted);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.image-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.image-toolbar a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.image-toolbar a:hover {
  text-decoration: underline;
}

/* ---------- detail panel ---------- */

.detail-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}

.meta-strip {
  flex-shrink: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-soft);
  border-radius: 12px 12px 0 0;
}

.detail-scroll {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 14px 18px 18px;
}

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

.block-heading h3 {
  margin: 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 24px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  color: var(--ink);
  font-size: 12px;
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chip b {
  color: var(--muted);
  font-weight: 600;
}

.qa-block,
.answer-block,
.json-block {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 14px;
}

.qa-block:first-of-type {
  border-top: 0;
  padding-top: 0;
}

h3 {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 700;
}

.rich-text {
  font-size: 14.5px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.rich-text strong {
  font-weight: 700;
}

.rich-text code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 12.5px;
}

.options-list {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 6px;
}

.options-list li {
  position: relative;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  line-height: 1.45;
  font-size: 13.5px;
}

.options-list li.correct {
  border-color: var(--green-line);
  background: var(--green-soft);
  font-weight: 600;
  padding-right: 88px;
}

.correct-badge {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--green);
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

:root[data-theme="dark"] .correct-badge {
  color: #06210f;
}

.answer-block {
  padding: 14px 16px;
  border: 1px solid var(--amber-line);
  border-radius: 10px;
  background: var(--amber-soft);
}

.answer-block h3 {
  color: var(--amber);
}

#answerText {
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.45;
  font-weight: 750;
  overflow-wrap: anywhere;
}

/* ---------- JSON blocks ---------- */

details summary {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  list-style: none;
  user-select: none;
}

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

details summary::before {
  content: "▸";
  font-size: 11px;
  transition: transform 0.15s ease;
}

details[open] summary::before {
  transform: rotate(90deg);
}

.summary-title {
  flex: 1;
}

.copy-btn {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--muted);
  padding: 3px 10px;
  font-size: 11.5px;
  font-weight: 650;
  letter-spacing: 0;
  text-transform: none;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.copy-btn:hover {
  background: var(--hover);
  color: var(--ink);
}

.copy-btn.copied {
  border-color: var(--green-line);
  background: var(--green-soft);
  color: var(--green);
}

pre {
  max-height: 380px;
  overflow: auto;
  margin: 10px 0 0;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 12px;
  line-height: 1.55;
}

.j-key { color: #7dd3fc; }
.j-str { color: #bef29b; }
.j-num { color: #fbbf77; }
.j-bool { color: #f0a6ca; }
.j-null { color: #94a3b8; font-style: italic; }

/* ---------- lightbox ---------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  gap: 10px;
  padding: 28px;
  background: rgba(5, 10, 20, 0.86);
  cursor: zoom-out;
  backdrop-filter: blur(3px);
}

.lightbox[hidden] {
  display: none;
}

.lightbox img {
  max-width: 94vw;
  max-height: 88vh;
  object-fit: contain;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
}

.lightbox-hint {
  position: fixed;
  bottom: 14px;
  left: 0;
  right: 0;
  margin: 0;
  text-align: center;
  color: rgba(255, 255, 255, 0.65);
  font-size: 12.5px;
}

/* ---------- misc ---------- */

.empty-state {
  padding: 22px;
  color: var(--muted);
  text-align: center;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--muted) 34%, transparent);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--muted) 55%, transparent);
  border: 2px solid transparent;
  background-clip: content-box;
}

/* ---------- responsive ---------- */

@media (max-width: 1120px) {
  body {
    overflow: auto;
  }

  .app-shell,
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    height: auto;
    overflow: visible;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: none;
  }

  .sample-list {
    max-height: 320px;
  }

  .image-panel,
  .detail-panel {
    height: auto;
  }

  .detail-panel {
    display: block;
    overflow: visible;
  }

  .detail-scroll {
    overflow: visible;
  }

  .image-frame {
    min-height: 380px;
  }

  .image-frame img {
    max-height: 70vh;
  }
}

@media (max-width: 680px) {
  .topbar {
    height: auto;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px;
  }

  .topbar-right {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .stats {
    justify-content: flex-start;
  }

  .control-grid {
    grid-template-columns: 1fr;
    padding: 14px;
  }

  label.wide {
    grid-column: auto;
  }

  .workspace {
    padding: 12px;
    gap: 12px;
  }

  .panel-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .sidebar-footer {
    display: none;
  }
}