.riddle-body {
  min-height: 100vh;
}

.riddle-topbar {
  position: relative;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px clamp(14px, 3vw, 40px);
}

.back-home {
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 10px 14px;
  border-radius: 999px;
  font-family: var(--font-ui);
  font-size: .82rem;
  text-transform: uppercase;
  background: rgba(0,0,0,.22);
}

.case-label.mini {
  position: static;
  width: auto;
  min-width: 140px;
}

.riddle-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto 56px;
  position: relative;
  z-index: 25;
}

.riddle-card {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 22px 90px var(--shadow);
  border-radius: 28px;
  padding: clamp(18px, 3vw, 42px);
  backdrop-filter: blur(10px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: .78rem;
}

.riddle-card h1 {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(2.4rem, 7vw, 5rem);
  letter-spacing: .05em;
  line-height: .9;
}

.riddle-phrase {
  margin: 24px 0 22px;
  padding: 20px;
  border-left: 3px solid var(--line-strong);
  background: rgba(255,255,255,.045);
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.6;
}

.evidence-area {
  display: grid;
  place-items: center;
}

.evidence-frame {
  width: min(860px, 100%);
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  background: #000;
  display: grid;
  place-items: center;
}

.riddle-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
}

.riddle-image-back {
  z-index: 1;
}

.riddle-image-front {
  z-index: 2;
  transform: scale(var(--zoom, 1)) rotate(var(--rotate, 0deg)) scaleX(var(--mirror, 1));
  filter: brightness(var(--brightness, 1)) contrast(var(--contrast, 1)) invert(var(--invert, 0));
  opacity: var(--opacity, 1);
  transition: transform .18s ease, filter .18s ease, opacity .18s ease;
}

.noise-layer {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.28) 0 1px, transparent 1px),
    radial-gradient(circle at 70% 80%, rgba(255,255,255,.20) 0 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.10) 1px, transparent 1px);
  background-size: 9px 9px, 13px 13px, 5px 5px;
  mix-blend-mode: screen;
  opacity: .45;
}

.evidence-frame.noise-on .noise-layer {
  display: block;
}

.mobile-panels,
.answer-panel,
.page-clues {
  margin-top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.tool-panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.04);
  margin-bottom: 14px;
  overflow: hidden;
}

.tool-panel summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  font-family: var(--font-ui);
  font-size: .95rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.tool-panel summary::after {
  content: '+';
  font-size: 1.2rem;
}

.tool-panel[open] summary::after {
  content: '–';
}

.panel-body {
  padding: 0 18px 18px;
}

.slider-group {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.slider-group label {
  font-family: var(--font-ui);
  text-transform: uppercase;
  font-size: .82rem;
}

.slider-group input[type='range'] {
  width: 100%;
}

.slider-group small,
.tool-note {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .86rem;
}

.tool-grid,
.page-tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.tool-grid button,
.page-tool-grid button,
.answer-row button {
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,.08);
  color: var(--text);
  border-radius: 12px;
  padding: 11px 10px;
  font-family: var(--font-ui);
  text-transform: uppercase;
  font-size: .72rem;
  cursor: pointer;
}

.tool-grid button:hover,
.page-tool-grid button:hover,
.answer-row button:hover,
.back-home:hover {
  background: var(--text);
  color: var(--bg);
}

.page-clues {
  color: var(--muted);
  font-size: .98rem;
  line-height: 1.6;
}

.page-clues > :first-child {
  margin-top: 0;
}

.hidden-text,
.theme-clue {
  color: var(--bg);
  user-select: text;
}

body.light .hidden-text,
body.light .theme-clue {
  color: var(--text);
}

.answer-panel label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-ui);
  text-transform: uppercase;
}

.answer-row {
  display: flex;
  gap: 10px;
}

.answer-row input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: rgba(0,0,0,.22);
  color: var(--text);
  font: 1rem var(--font-mono);
  padding: 14px 16px;
  outline: none;
}

.answer-message {
  min-height: 24px;
  font-family: var(--font-mono);
  color: var(--muted);
}

.answer-message.ok {
  color: var(--text);
}

.answer-message.error {
  color: #ffb4b4;
}

.next-case {
  display: inline-flex;
  margin-top: 8px;
  color: var(--bg);
  background: var(--text);
  text-decoration: none;
  font-family: var(--font-ui);
  text-transform: uppercase;
  border-radius: 999px;
  padding: 12px 18px;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .riddle-topbar {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .riddle-nav {
    width: 100%;
    justify-content: center;
  }

  .tool-grid,
  .page-tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .answer-row {
    flex-direction: column;
  }

  .tool-panel {
    margin-bottom: 12px;
  }
}

.page-clues-above {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
  margin-bottom: 22px;
}