/* ==========================================================================
   Video Essentials Guide — Styles
   Interactive reference guide for DSLR/Mirrorless video
   ========================================================================== */

.video-guide-page {
  --color-framerate: #3b82f6;
  --color-shutter-v: #f59e0b;
  --color-resolution: #8b5cf6;
  --color-bitrate: #ef4444;
  --color-color: #14b8a6;
  --color-audio: #f97316;
}

/* --------------------------------------------------------------------------
   Shared: Reference Grid & Cards
   -------------------------------------------------------------------------- */
.ref-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.ref-grid--2 { grid-template-columns: repeat(2, 1fr); }
.ref-grid--3 { grid-template-columns: repeat(3, 1fr); }
.ref-grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .ref-grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .ref-grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .ref-grid--2,
  .ref-grid--3,
  .ref-grid--4 { grid-template-columns: 1fr; }
}

.ref-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.ref-card--compact {
  padding: var(--space-4);
}

.ref-card-badge {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-gray-500);
}

.ref-card-value {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-black);
}

.ref-card-label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
}

.ref-card-detail {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
}

.subsection-title {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  margin-top: var(--space-10);
  margin-bottom: var(--space-2);
}

.tip-callout {
  margin-top: var(--space-8);
  padding: var(--space-5);
  background: var(--color-gray-100);
  border-left: 3px solid var(--color-gray-400);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------------------------------
   Shared: Slider & Controls
   -------------------------------------------------------------------------- */
.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
}

.slider-range {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-gray-500);
  margin-top: var(--space-1);
}

.demo-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-gray-200);
  outline: none;
  cursor: pointer;
}

.demo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-black);
  cursor: pointer;
  border: 2px solid var(--color-white);
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

.demo-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-black);
  cursor: pointer;
  border: 2px solid var(--color-white);
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

/* --------------------------------------------------------------------------
   Shared: Button Groups
   -------------------------------------------------------------------------- */
.fps-btn-group {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.fps-btn-group--small {
  gap: var(--space-1);
}

.fps-btn,
.color-btn {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--color-white);
  color: var(--color-gray-600);
  cursor: pointer;
  transition: all 0.2s ease;
}

.fps-btn:hover,
.color-btn:hover {
  border-color: var(--color-gray-500);
  color: var(--color-black);
}

.fps-btn.active,
.color-btn.active {
  background: var(--color-black);
  border-color: var(--color-black);
  color: var(--color-white);
}

.fps-btn-group--small .fps-btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

/* --------------------------------------------------------------------------
   Section 1: Frame Rate & Motion
   -------------------------------------------------------------------------- */
.fps-demo {
  margin-bottom: var(--space-8);
}

.fps-preview {
  background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  margin-bottom: var(--space-5);
  overflow: hidden;
}

.fps-canvas {
  position: relative;
  height: 100px;
  margin-bottom: var(--space-5);
}

.fps-ball {
  position: absolute;
  width: 36px;
  height: 36px;
  background: var(--color-framerate);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  left: 0;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  z-index: 2;
}

.fps-trail {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  height: 36px;
  border-radius: 18px;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.15));
  z-index: 1;
  left: 0;
  width: 0;
}

.fps-filmstrip {
  display: flex;
  gap: 3px;
  height: 48px;
}

.fps-filmstrip-frame {
  flex: 1;
  background: rgba(255,255,255,0.6);
  border-radius: 3px;
  border: 1px solid rgba(99, 102, 241, 0.15);
  position: relative;
}

.fps-filmstrip-frame.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--color-framerate);
}

.fps-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.fps-label {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Section 2: Shutter Angle & 180-Degree Rule
   -------------------------------------------------------------------------- */
.shutter-angle-demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  align-items: start;
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.ref-section--alt .shutter-angle-demo,
.ref-section--alt .resolution-demo,
.ref-section--alt .audio-demo {
  background: var(--color-white);
}

@media (max-width: 768px) {
  .shutter-angle-demo {
    grid-template-columns: 1fr;
    padding: var(--space-6);
  }
}

.shutter-visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  align-items: center;
}

.shutter-disc-wrapper {
  position: relative;
  width: 220px;
  height: 220px;
}

.shutter-disc {
  width: 100%;
  height: 100%;
}

.shutter-angle-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
}

.shutter-motion-preview {
  height: 70px;
  width: 100%;
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.shutter-motion-ball {
  position: absolute;
  width: 28px;
  height: 28px;
  background: var(--color-shutter-v);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  left: 10%;
  box-shadow: 0 3px 8px rgba(245, 158, 11, 0.4);
}

.shutter-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  justify-content: center;
}

.shutter-fps-select {
  margin-top: var(--space-2);
}

.shutter-result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  margin-top: var(--space-2);
}

.shutter-result-label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
}

.shutter-result-value {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-shutter-v);
}

/* Ref Table (div-based) */
.ref-table {
  margin-top: var(--space-6);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.video-guide-page .ref-table {
  display: flex;
  flex-direction: column;
}

.ref-table-header,
.ref-table-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: var(--space-3) var(--space-4);
}

.ref-table-header {
  background: var(--color-gray-50);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-gray-500);
  border-bottom: 1px solid var(--color-gray-200);
}

.ref-table-row {
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-gray-100);
}

.ref-table-row:last-child {
  border-bottom: none;
}

.ref-table-row:hover {
  background: var(--color-gray-50);
}

/* --------------------------------------------------------------------------
   Section 3: Resolution & Aspect Ratios
   -------------------------------------------------------------------------- */
.resolution-demo {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  align-items: center;
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

@media (max-width: 768px) {
  .resolution-demo {
    grid-template-columns: 1fr;
    padding: var(--space-6);
  }
}

.resolution-boxes {
  position: relative;
}

.res-box {
  border: 2px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  aspect-ratio: 16/9;
}

.res-box > .res-box {
  align-self: flex-end;
  margin-left: auto;
  margin-top: auto;
}

.res-box--8k { width: 100%; }
.res-box--6k { width: 75%; }
.res-box--4k { width: 80%; }
.res-box--1080 { width: 50%; }
.res-box--720 { width: 67%; }

.res-box.active {
  border-color: var(--color-resolution);
  background: rgba(139, 92, 246, 0.06);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.12);
}

.res-label {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-500);
  padding: 2px var(--space-2);
  pointer-events: none;
}

.res-box.active > .res-label {
  color: var(--color-resolution);
}

.resolution-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.res-info-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-resolution);
}

.res-info-name {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
}

.res-info-detail {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

.res-info-use {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-2);
}

.aspect-ratio-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

@media (max-width: 900px) {
  .aspect-ratio-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .aspect-ratio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.aspect-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.aspect-container {
  height: 140px;
  background: var(--color-gray-900);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  container-type: size;
}

.aspect-shape {
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.08);
  aspect-ratio: var(--ar);
  width: min(calc(100cqw - 1.5rem), calc((100cqh - 1.5rem) * var(--arv)));
}

.aspect-label {
  font-weight: var(--font-weight-semibold);
  margin-top: var(--space-1);
}

.aspect-detail {
  font-size: var(--text-xs);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------------------------------
   Section 4: Bitrate & Codecs
   -------------------------------------------------------------------------- */
.bitrate-demo {
  margin-bottom: var(--space-8);
}

.bitrate-scene {
  position: relative;
  height: 300px;
  background: linear-gradient(135deg, #1e293b, #334155, #475569);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-5);
}

.bitrate-bar-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.bitrate-row-label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-500);
  white-space: nowrap;
  flex-shrink: 0;
}

.bitrate-row-value {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 70px;
  text-align: center;
}

.bitrate-slider {
  flex: 1;
  min-width: 0;
}

@media (max-width: 640px) {
  .bitrate-bar-row {
    flex-wrap: wrap;
  }
  .bitrate-meter {
    width: 100%;
    order: 3;
  }
  .bitrate-slider {
    width: 100%;
    order: 4;
  }
}

.bitrate-noise {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.bitrate-pixel-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  grid-template-rows: repeat(12, 1fr);
  gap: 1px;
  opacity: 0;
  transition: opacity 0.3s;
}

.bitrate-pixel-grid.visible {
  opacity: 1;
}

.bitrate-pixel {
  background: rgba(255,255,255,0.03);
  border-radius: 1px;
}

.bitrate-meter {
  height: 12px;
  background: var(--color-gray-200);
  border-radius: 6px;
  overflow: hidden;
  flex: 1;
  min-width: 0;
}

.bitrate-meter-fill {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--color-bitrate), var(--color-shutter-v), var(--color-color));
  width: 75%;
  transition: width 0.3s;
}

.bitrate-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* --------------------------------------------------------------------------
   Section 5: Color & LOG Profiles
   -------------------------------------------------------------------------- */
.color-demo {
  margin-bottom: var(--space-8);
}

.color-scene-wrapper {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-5);
}

.color-scene {
  position: relative;
  display: flex;
  height: 200px;
  overflow: hidden;
  transition: all 0.5s ease;
}

.color-band {
  flex: 1;
  transition: all 0.5s ease;
}

.color-band--shadows {
  background: linear-gradient(180deg, #0a0a1a 0%, #1a1a3a 50%, #2a1a2a 100%);
}

.color-band--darks {
  background: linear-gradient(180deg, #2d3a5c 0%, #4a3a5c 40%, #6b3a3a 100%);
}

.color-band--mids {
  background: linear-gradient(180deg, #5b7fb5 0%, #d4a76a 50%, #c46b4a 100%);
}

.color-band--lights {
  background: linear-gradient(180deg, #f0c87a 0%, #e8a060 40%, #f5c890 100%);
}

.color-band--highlights {
  background: linear-gradient(180deg, #fff5e0 0%, #ffe8c0 50%, #ffffff 100%);
}

.color-scene-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
}

.color-zone-label {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-weight: var(--font-weight-medium);
}

.color-zone-label:last-child {
  color: rgba(0, 0, 0, 0.35);
}

/* LOG — flat, desaturated, lifted shadows, pulled highlights */
.color-scene.log-profile .color-band--shadows {
  background: linear-gradient(180deg, #3a3a42 0%, #444450 50%, #4a4248 100%);
}

.color-scene.log-profile .color-band--darks {
  background: linear-gradient(180deg, #5a5e6a 0%, #605a68 40%, #6a5a5a 100%);
}

.color-scene.log-profile .color-band--mids {
  background: linear-gradient(180deg, #8a9aaa 0%, #b0a088 50%, #a88a7a 100%);
}

.color-scene.log-profile .color-band--lights {
  background: linear-gradient(180deg, #c8c0a8 0%, #c4b098 40%, #ccc4a8 100%);
}

.color-scene.log-profile .color-band--highlights {
  background: linear-gradient(180deg, #d8d4c8 0%, #d4d0c0 50%, #dcdcd0 100%);
}

/* Graded — cinematic teal/orange push */
.color-scene.graded-profile .color-band--shadows {
  background: linear-gradient(180deg, #040810 0%, #0a1828 50%, #180a1a 100%);
}

.color-scene.graded-profile .color-band--darks {
  background: linear-gradient(180deg, #1a3050 0%, #3a2848 40%, #5a2020 100%);
}

.color-scene.graded-profile .color-band--mids {
  background: linear-gradient(180deg, #3a7aaa 0%, #d49050 50%, #b84a2a 100%);
}

.color-scene.graded-profile .color-band--lights {
  background: linear-gradient(180deg, #e8b060 0%, #d88a40 40%, #f0c070 100%);
}

.color-scene.graded-profile .color-band--highlights {
  background: linear-gradient(180deg, #fff0d0 0%, #ffe0a8 50%, #fffaf0 100%);
}

.color-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.color-label {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  text-align: center;
  min-height: 40px;
}

/* --------------------------------------------------------------------------
   Section 6: White Balance
   -------------------------------------------------------------------------- */
.wb-demo {
  margin-bottom: var(--space-8);
}

.wb-strip-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.wb-strip {
  position: relative;
  height: 160px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #f0f0f0;
  transition: filter 0.15s ease;
}

.wb-strip-bars {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: stretch;
  gap: 3px;
  padding: var(--space-5);
}

.wb-swatch {
  flex: 1;
  border-radius: var(--radius-md);
}

.wb-swatch:nth-child(1) { background: #1a1a1a; }
.wb-swatch:nth-child(2) { background: #666; }
.wb-swatch:nth-child(3) { background: #999; }
.wb-swatch:nth-child(4) { background: #ccc; }
.wb-swatch:nth-child(5) { background: #fff; }

.wb-strip-value {
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.wb-scale {
  position: relative;
  padding-bottom: var(--space-6);
}

.wb-gradient {
  height: 16px;
  border-radius: 8px;
  background: linear-gradient(90deg,
    #ff8c00 0%,
    #ffb347 15%,
    #ffd89b 30%,
    #fff5e6 42%,
    #ffffff 50%,
    #e6f0ff 58%,
    #b3d4fc 70%,
    #6fa8dc 85%,
    #4a86c8 100%
  );
  border: 1px solid var(--color-gray-200);
}

.wb-marker {
  position: absolute;
  top: -4px;
  width: 4px;
  height: 24px;
  background: var(--color-black);
  border-radius: 2px;
  left: 46%;
  transition: left 0.15s ease;
  box-shadow: 0 0 0 2px rgba(0,0,0,0.1);
}

.wb-scale-ticks {
  position: absolute;
  top: calc(100% - var(--space-4));
  left: 0;
  right: 0;
  height: 20px;
}

.wb-tick {
  position: absolute;
  transform: translateX(-50%);
  font-size: 10px;
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-500);
  white-space: nowrap;
}

.wb-tick::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  width: 1px;
  height: 6px;
  background: var(--color-gray-400);
  margin-bottom: 2px;
}

.wb-slider {
  margin-top: var(--space-1);
}

/* --------------------------------------------------------------------------
   Section 7: Audio Essentials
   -------------------------------------------------------------------------- */
.audio-demo {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.audio-meter-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.audio-meter {
  position: relative;
  width: 100%;
  height: 48px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.audio-meter-track {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: row;
}

.audio-zone {
  height: 100%;
}

.audio-zone--quiet { background: #e5e7eb; flex: 3; }
.audio-zone--low { background: #86efac; flex: 2; }
.audio-zone--sweet { background: #22c55e; flex: 1.5; }
.audio-zone--hot { background: #f59e0b; flex: 1; }
.audio-zone--clip { background: #dc2626; flex: 0.5; }

.audio-meter-fill {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 35%;
  background: rgba(0,0,0,0.12);
  transition: width 0.15s ease;
  pointer-events: none;
}

.audio-meter-peak {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-black);
  left: 65%;
  transition: left 0.15s ease;
  pointer-events: none;
}

.audio-target-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 62.5%;
  width: 12.5%;
  border-left: 2px dashed rgba(0,0,0,0.35);
  border-right: 2px dashed rgba(0,0,0,0.35);
  pointer-events: none;
}

.audio-meter-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--color-gray-500);
  padding: 0 2px;
}

.audio-status {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  min-height: 20px;
}

/* --------------------------------------------------------------------------
   Section 8: Camera Movement
   -------------------------------------------------------------------------- */
.movement-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .movement-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .movement-grid {
    grid-template-columns: 1fr;
  }
}

.movement-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
}

.movement-icon {
  width: 80px;
  height: 60px;
  margin: 0 auto var(--space-3);
  color: var(--color-gray-600);
}

.movement-icon svg {
  width: 100%;
  height: 100%;
}

.movement-name {
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.movement-desc {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------------------------------
   Section 9: Quick Video Cheat Sheet
   -------------------------------------------------------------------------- */
.video-cheat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .video-cheat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .video-cheat-grid {
    grid-template-columns: 1fr;
  }
}

.video-cheat-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.video-cheat-title {
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-gray-200);
}

.video-cheat-settings {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.video-cheat-settings .cheat-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-gray-100);
  background: none;
  gap: var(--space-2);
}

.video-cheat-settings .cheat-item:last-child {
  border-bottom: none;
}

.video-cheat-settings .cheat-term {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-500);
  white-space: nowrap;
}

.video-cheat-settings .cheat-answer {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-black);
  text-align: right;
}

/* --------------------------------------------------------------------------
   Night Vision Mode
   -------------------------------------------------------------------------- */
body.night-vision .ref-card {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
}

body.night-vision .ref-card-value {
  color: var(--nv-text);
}

body.night-vision .ref-card-label {
  color: var(--nv-text-muted);
}

body.night-vision .ref-card-detail {
  color: var(--nv-text-dim);
}

body.night-vision .ref-card-badge {
  color: var(--nv-text-dim);
}

body.night-vision .subsection-title {
  color: var(--nv-text);
}

body.night-vision .tip-callout {
  background: var(--nv-bg-elevated);
  border-left-color: var(--nv-text-dim);
  color: var(--nv-text-muted);
}

body.night-vision .slider-label {
  color: var(--nv-text-muted);
}

body.night-vision .slider-range {
  color: var(--nv-text-dim);
}

body.night-vision .demo-slider {
  background: var(--nv-bg-elevated);
}

body.night-vision .demo-slider::-webkit-slider-thumb {
  background: var(--nv-text);
  border-color: var(--nv-bg);
}

body.night-vision .demo-slider::-moz-range-thumb {
  background: var(--nv-text);
  border-color: var(--nv-bg);
}

body.night-vision .fps-btn,
body.night-vision .color-btn {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
  color: var(--nv-text-muted);
}

body.night-vision .fps-btn:hover,
body.night-vision .color-btn:hover {
  border-color: var(--nv-text-dim);
  color: var(--nv-text);
}

body.night-vision .fps-btn.active,
body.night-vision .color-btn.active {
  background: var(--nv-text);
  border-color: var(--nv-text);
  color: var(--nv-bg);
}

body.night-vision .fps-preview {
  background: linear-gradient(135deg, #200000, #300505);
}

body.night-vision .fps-label {
  color: var(--nv-text-muted);
}

body.night-vision .fps-filmstrip-frame {
  background: rgba(204, 51, 51, 0.1);
  border-color: var(--nv-border);
}

body.night-vision .fps-filmstrip-frame.active {
  background: rgba(204, 51, 51, 0.2);
  border-color: var(--nv-text);
}

body.night-vision .shutter-angle-demo {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
}

body.night-vision .shutter-motion-preview {
  background: linear-gradient(135deg, #200000, #301010);
}

body.night-vision .shutter-result {
  background: var(--nv-bg-elevated);
}

body.night-vision .shutter-result-label {
  color: var(--nv-text-muted);
}

body.night-vision .shutter-result-value {
  color: var(--nv-text);
}

body.night-vision .ref-table-header {
  background: var(--nv-bg-elevated);
  color: var(--nv-text-dim);
  border-bottom-color: var(--nv-border);
}

body.night-vision .ref-table-row {
  border-bottom-color: var(--nv-border-subtle, var(--nv-border));
  color: var(--nv-text);
}

body.night-vision .ref-table-row:hover {
  background: var(--nv-bg-card);
}

body.night-vision .video-guide-page .ref-table {
  border-color: var(--nv-border);
}

body.night-vision .resolution-demo {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
}

body.night-vision .res-box {
  border-color: var(--nv-border);
  background: rgba(100, 20, 20, 0.05);
}

body.night-vision .res-box.active {
  border-color: var(--nv-text);
  box-shadow: 0 0 0 3px rgba(204, 51, 51, 0.15);
}

body.night-vision .res-label {
  color: var(--nv-text-dim);
}

body.night-vision .res-box.active > .res-label {
  color: var(--nv-text);
}

body.night-vision .res-info-title {
  color: var(--nv-text);
}

body.night-vision .res-info-name {
  color: var(--nv-text);
}

body.night-vision .res-info-detail {
  color: var(--nv-text-dim);
}

body.night-vision .res-info-use {
  color: var(--nv-text-muted);
}

body.night-vision .aspect-container {
  background: #0a0000;
}

body.night-vision .aspect-shape {
  border-color: rgba(204, 51, 51, 0.4);
  background: rgba(204, 51, 51, 0.05);
}

body.night-vision .aspect-label {
  color: var(--nv-text);
}

body.night-vision .aspect-detail {
  color: var(--nv-text-dim);
}

body.night-vision .bitrate-scene {
  background: linear-gradient(135deg, #1a0000, #200505, #2a0808);
}

body.night-vision .bitrate-row-label {
  color: var(--nv-text-dim);
}

body.night-vision .bitrate-row-value {
  color: var(--nv-text);
}

body.night-vision .bitrate-meter {
  background: var(--nv-bg-elevated);
}

body.night-vision .bitrate-meter-fill {
  background: linear-gradient(90deg, var(--nv-text), #993333, #996633);
}

body.night-vision .color-label {
  color: var(--nv-text-muted);
}

body.night-vision .wb-strip {
  background: #2a2020;
}

body.night-vision .wb-strip-value {
  color: var(--nv-text);
}

body.night-vision .wb-gradient {
  border-color: var(--nv-border);
  opacity: 0.7;
}

body.night-vision .wb-marker {
  background: var(--nv-text);
  box-shadow: 0 0 0 2px rgba(204, 51, 51, 0.15);
}

body.night-vision .wb-tick {
  color: var(--nv-text-dim);
}

body.night-vision .wb-tick::before {
  background: var(--nv-text-dim);
}

body.night-vision .audio-zone--clip { background: #8b0000; }
body.night-vision .audio-zone--hot { background: #996633; }
body.night-vision .audio-zone--sweet { background: #336633; }
body.night-vision .audio-zone--low { background: #1a3a1a; }
body.night-vision .audio-zone--quiet { background: var(--nv-bg-elevated); }

body.night-vision .audio-meter-peak {
  background: var(--nv-text);
}

body.night-vision .audio-demo {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
}

body.night-vision .audio-meter-fill {
  background: rgba(0,0,0,0.3);
}

body.night-vision .audio-meter-ticks {
  color: var(--nv-text-dim);
}

body.night-vision .audio-target-zone {
  border-color: rgba(255,255,255,0.25);
}

body.night-vision .audio-status {
  color: var(--nv-text-muted);
}

body.night-vision .movement-card {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
}

body.night-vision .movement-icon {
  color: var(--nv-text-muted);
}

body.night-vision .movement-name {
  color: var(--nv-text);
}

body.night-vision .movement-desc {
  color: var(--nv-text-dim);
}

body.night-vision .video-cheat-card {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
}

body.night-vision .video-cheat-title {
  color: var(--nv-text);
  border-bottom-color: var(--nv-border);
}

body.night-vision .video-cheat-settings .cheat-item {
  border-bottom-color: var(--nv-border-subtle, var(--nv-border));
  background: none;
}

body.night-vision .video-cheat-settings .cheat-term {
  color: var(--nv-text-dim);
}

body.night-vision .video-cheat-settings .cheat-answer {
  color: var(--nv-text);
}