/* =========================================================
   Physics Presentation Engine

   Reusable UI Components

========================================================= */

/* =========================================================
   BUTTONS
========================================================= */

button {
  padding: 8px 14px;

  border-radius: var(--border-radius-small);

  background: var(--surface-light);

  color: var(--text-primary);

  border: 1px solid var(--border-color);

  transition: var(--transition-fast);
}

button:hover {
  background: var(--primary-color);

  color: white;
}

button:active {
  transform: scale(0.96);
}

/* =========================================================
   ICON BUTTONS
========================================================= */

.icon-button {
  width: 38px;

  height: 38px;

  display: flex;

  align-items: center;

  justify-content: center;

  border-radius: 50%;

  font-size: 1.1rem;
}

/* =========================================================
   THUMBNAIL CARDS
========================================================= */

/* .thumbnail-card {
  width: 100%;
  height: var(--thumbnail-height);
  margin-bottom: var(--space-3);
  background: var(--surface-light);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
} */

.thumbnail-card {

    width:100%;
    min-height:55px;
    padding:10px;
    margin-bottom:8px;
    background:#161b22;
    border-radius:8px;
    cursor:pointer;
    transition:0.2s;
}
.thumbnail-header {
    display:flex;
    align-items:flex-start;
    gap:12px;
}

.thumbnail-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.thumbnail-card.active {
  border-color: var(--primary-color);
  box-shadow: 0 0 15px rgba(77, 163, 255, 0.5);
}

/* .thumbnail-image {
  width: 100%;
  height: calc(100% - 28px);
  object-fit: cover;
  background: #000;
} */

/* .thumbnail-title {
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-small);
  color: var(--text-secondary);
} */

.thumbnail-title {
    flex:1;
    font-size:14px;
    line-height:1.4;
    color:white;
}

/* .thumbnail-number {
  position: absolute;
  top: 6px;
  left: 6px;
  background: rgba(0, 0, 0, 0.65);
  color: white;
  padding: 2px 7px;
  border-radius: 10px;
  font-size: 12px;
} */

.thumbnail-number {
    width:30px;
    height:30px;
    flex-shrink:0;
    display:flex;
    justify-content:center;
    align-items:center;
    border-radius:50%;
    background:#4cc9f0;
    color:#071018;
    font-weight:bold;
}

/* =========================================================
   SLIDE ELEMENTS
========================================================= */

.slide-title {
  font-size: var(--font-size-slide-title);

  margin-bottom: var(--space-5);
}

.slide-text {
  font-size: 1.2rem;
  line-height: 1.8;
}

.slide-image {
  border-radius: var(--image-radius);
  box-shadow: var(--shadow);
}

.slide-image-c50 {
  border-radius: var(--image-radius);
  box-shadow: var(--shadow);

  width: 50%;
  height: auto;
  display: block;
  margin: 0 auto;
  user-select: none;
}

.slide-image-c70 {
  border-radius: var(--image-radius);
  box-shadow: var(--shadow);

  width: 70%;
  height: auto;
  display: block;
  margin: 0 auto;
  user-select: none;
}

.slide-image-c80 {
  border-radius: var(--image-radius);
  box-shadow: var(--shadow);

  width: 80%;
  height: auto;
  display: block;
  margin: 0 auto;
  user-select: none;
}

.slide-image-c90 {
  border-radius: var(--image-radius);
  box-shadow: var(--shadow);

  width: 90%;
  height: auto;
  display: block;
  margin: 0 auto;
  user-select: none;
}

/* .slide-code {
    background: #000000;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    text-align: left;
    font-family: Consolas, "Courier New", monospace;
    font-size: 14px;
    line-height: 1.5;
    white-space: pre;
} */

/* .slide-code {
    background: #1e1e1e !important;
    width: 90%;
    margin: 20px auto;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    text-align: left;
    font-family: Consolas, "Courier New", monospace;
    font-size: 15px;
    line-height: 1.5;
} */

/* .slide-code code {
  background: transparent !important;
    font-family: inherit;
} */

/* .slide-code,
.slide-code code {
  background: #1e1e1e !important;
    font-family: "Fira Code", "Cascadia Code", Consolas, monospace !important;
    font-size: 16px !important;
    line-height: 1.5 !important;
} */


.slide-code,
.slide-code code {
  /* background: #160331 !important; */
    font-family: "Courier New", Consolas, monospace !important;
    font-size: 16px !important;
    line-height: 1.5 !important;
}

/* .formula {
    text-align: center;
    margin: 20px auto;
    font-size: 1.4em;
}

.physics-law {
    text-align: center;
    margin: 30px auto;
    padding: 20px;
    font-size: 1.8em;
} */

/* .formula {
    text-align: center;
    margin: 20px auto;
    font-size: 1.4em;
} */

.formula {
    position: relative;
    text-align: center;
    margin: 25px auto;
}

.formula-number {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1em;
}

.formula-label {
    margin-top: 8px;
    font-size: 0.9em;
    font-style: italic;
}

.physics-law {
    text-align: center;
    margin: 30px auto;
    padding: 20px;
    font-size: 1.8em;
    font-weight: bold;
}

.derivation {
    text-align: center;
    margin: 30px auto;
    font-size: 1.5em;
}




/* .formula {
    text-align: center;
    margin: 20px auto;
    font-size: 1.4em;
}

.physics-law {
    text-align: center;
    margin: 30px auto;
    padding: 20px;
    font-size: 1.8em;
    font-weight: bold;
}

.derivation {
    text-align: center;
    margin: 30px auto;
    font-size: 1.5em;
}

.formula-number {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.formula-label {
    margin-top: 8px;
    font-size: 0.9em;
    font-style: italic;
} */

.text-line {
    margin: 15px 0;
    line-height: 1.8;
}

.inline-formula {
    display: inline;
    margin: 0 4px;
}

.rich-text {
    margin: 15px 0;
    line-height: 1.8;
}

.inline-formula {
    display: inline;
    margin: 0 4px;
}

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

.rich-text em {
    font-style: italic;
}

.rich-text a {
    text-decoration: underline;
}


.slide-video {
  width: 100%;

  border-radius: var(--video-radius);

  box-shadow: var(--shadow);
}

/* =========================================================
   LOADING SCREEN
========================================================= */

.loading {
  display: flex;

  align-items: center;

  justify-content: center;

  width: 100%;

  height: 100%;

  color: var(--text-muted);

  font-size: var(--font-size-large);
}

.loading::after {
  content: "";

  width: 20px;

  height: 20px;

  margin-left: 12px;

  border-radius: 50%;

  border: 3px solid var(--primary-color);

  border-top-color: transparent;

  animation: loading-spin 1s linear infinite;
}

@keyframes loading-spin {
  to {
    transform: rotate(360deg);
  }
}

/* =========================================================
   INFORMATION CARDS
========================================================= */

.info-card {
  background: var(--surface-light);

  border: 1px solid var(--border-color);

  border-radius: var(--border-radius);

  padding: var(--space-4);

  margin-bottom: var(--space-4);
}

.info-card-title {
  font-weight: 600;

  margin-bottom: var(--space-2);

  color: var(--primary-color);
}

.info-card-content {
  color: var(--text-secondary);

  line-height: 1.7;
}

/* =========================================================
   FORMULA BOXES
========================================================= */

.formula {
  background: rgba(77, 163, 255, 0.12);

  border-left: 4px solid var(--primary-color);

  padding: var(--space-4);

  margin: var(--space-4) 0;

  font-family: "Cambria Math", serif;

  font-size: 1.3rem;

  border-radius: var(--border-radius-small);
}

/* =========================================================
   QUIZ COMPONENTS
========================================================= */

.quiz-card {
  background: var(--surface-light);

  padding: var(--space-5);

  border-radius: var(--border-radius);
}

.quiz-question {
  font-size: var(--font-size-large);

  margin-bottom: var(--space-4);
}

.quiz-option {
  display: flex;

  align-items: center;

  gap: var(--space-2);

  padding: 10px;

  margin-bottom: 8px;

  border-radius: var(--border-radius-small);

  background: var(--surface-color);

  cursor: pointer;
}

.quiz-option:hover {
  background: rgba(77, 163, 255, 0.15);
}

.quiz-option.correct {
  background: rgba(56, 217, 150, 0.2);
}

.quiz-option.incorrect {
  background: rgba(255, 92, 92, 0.2);
}

/* =========================================================
   BADGES
========================================================= */

.badge {
  display: inline-flex;

  align-items: center;

  padding: 4px 10px;

  border-radius: 20px;

  font-size: 0.75rem;

  background: var(--primary-color);

  color: white;
}

.badge.success {
  background: var(--success-color);
}

.badge.warning {
  background: var(--warning-color);

  color: #000;
}

/* =========================================================
   TOOLTIP
========================================================= */

.tooltip {
  position: relative;
}

.tooltip:hover::after {
  content: attr(data-tooltip);

  position: absolute;

  bottom: calc(100% + 8px);

  left: 50%;

  transform: translateX(-50%);

  background: #000;

  color: white;

  padding: 6px 10px;

  border-radius: 6px;

  font-size: 12px;

  white-space: nowrap;
}

/* =========================================================
   EMPTY STATES
========================================================= */

.empty-state {
  display: flex;

  flex-direction: column;

  justify-content: center;

  align-items: center;

  height: 100%;

  color: var(--text-muted);

  text-align: center;
}

.laser-pointer {
  position: absolute;

  border-radius: 50%;

  pointer-events: none;

  box-shadow:
    0 0 15px currentColor,
    0 0 30px currentColor;

  z-index: 100;

  transform: translate(0, 0);
}




/* #annotation-canvas {
    position: absolute;
    left: 0;
    top: 0;

    width: 100%;
    height: 100%;

    pointer-events: none;

    inset:0;
    pointer-events:auto;
    z-index:20;

} */

/* #annotation-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    pointer-events: none;
    pointer-events: auto;
}

#annotation-canvas.drawing {
    pointer-events: auto;
} */