/*-- scss:defaults --*/

// RMEB Color Palette — Prussian Blue + Cyan
$ruc-red: #003153;    // Prussian Blue (replaces RUC red as primary)
$ruc-gold: #00A8CC;   // Cyan Blue (replaces gold as accent)
$dark-blue: #003153;  // Same as primary
$light-bg: #FAF8F5;
$text-dark: #333333;

// Primary colors
$primary: $ruc-red;
$secondary: $ruc-gold;
$body-bg: #ffffff;
$body-color: $text-dark;

// Font Settings - Optimized for readability
$font-family-sans-serif: "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", sans-serif;
$font-family-monospace: "Source Code Pro", "Fira Code", Consolas, monospace;

// Font Sizes - Reduced for better content fit
$presentation-font-size-root: 26px;                    // Base font size for better single-slide fit
$presentation-font-size-smaller: 0.75rem;              // Smaller text
$presentation-line-height: 1.32;                       // Tighter line spacing

// Headings
$presentation-heading-font: $font-family-sans-serif;
$presentation-heading-color: $ruc-red;
$presentation-heading-font-weight: 600;
$presentation-h1-font-size: 1.6em;                     // Main titles
$presentation-h2-font-size: 1.35em;                    // Section titles
$presentation-h3-font-size: 1.1em;                     // Subsection titles
$presentation-h4-font-size: 1.1em;                     // Small headings

// Code blocks
$code-block-bg: #f5f5f5;
$code-block-border-color: $ruc-gold;

/*-- scss:rules --*/

// Base slide font adjustments
.reveal {
  font-size: $presentation-font-size-root;
  line-height: $presentation-line-height;
}

// Custom title slide
.reveal .title-slide {
  background: linear-gradient(135deg, $ruc-red 0%, darken($ruc-red, 15%) 100%);
  color: white;

  h1 {
    color: white;
    font-size: 2.2em;           // Slightly reduced
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 0.3em;
  }

  h2 {
    color: rgba(255,255,255,0.9);
    font-size: 1.3em;           // Reduced
    font-weight: 400;
    margin-bottom: 0.5em;
  }

  .author {
    color: white;
    font-size: 1em;             // Reduced
    margin-bottom: 0.3em;
  }

  .institute {
    color: rgba(255,255,255,0.8);
    font-size: 0.9em;           // Reduced
  }

  .date {
    color: rgba(255,255,255,0.7);
    font-size: 0.85em;          // Reduced
  }
}

// Regular slide headings
.reveal h1 {
  font-size: $presentation-h1-font-size;
  margin-bottom: 0.28em;
}

.reveal h2 {
  font-size: $presentation-h2-font-size;
  margin-bottom: 0.24em;
}

.reveal h3 {
  font-size: $presentation-h3-font-size;
  margin-bottom: 0.3em;
}

.reveal p, .reveal li {
  font-size: 1em;
  line-height: 1.35;
  margin-bottom: 0.24em;
}

// Section slides
.reveal .section-slide {
  background: $ruc-red;
  color: white;

  h1, h2 {
    color: white;
  }
}

// Custom boxes - Compact styling
.reveal .concept-box {
  background: lighten($dark-blue, 70%);
  border-left: 4px solid $dark-blue;
  padding: 10px 12px;
  margin: 8px 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.95em;

  strong:first-child,
  b:first-child {
    color: $dark-blue;
    font-weight: 600;
    font-size: 1.05em;
    display: block;
    margin-bottom: 8px;
  }

  p {
    margin-bottom: 0.3em;
  }

  ul, ol {
    margin: 8px 0;
  }
}

// Research mission box
.reveal .research-mission {
  background: linear-gradient(135deg, rgba(0, 49, 83, 0.08) 0%, rgba(0, 168, 204, 0.08) 100%);
  border-left: 5px solid $ruc-red;
  border-right: 1px solid rgba($ruc-red, 0.3);
  padding: 16px 18px;
  margin: 12px 0;
  border-radius: 8px;
  font-size: 0.98em;
  line-height: 1.6;

  strong:first-child,
  b:first-child {
    color: $ruc-red;
    font-weight: 700;
    font-size: 1.1em;
    display: block;
    margin-bottom: 10px;
  }

  blockquote {
    margin: 0;
    padding-left: 0;
    border-left: 0;
    color: $ruc-red;
    font-style: normal;
    font-weight: 500;
    font-size: 1.05em;
    line-height: 1.8;
  }

  p {
    margin: 8px 0;
  }
}.reveal .example-box {
  background: lighten($ruc-gold, 50%);
  border-left: 4px solid $ruc-gold;
  padding: 10px 12px;
  margin: 8px 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.95em;

  strong:first-child,
  b:first-child {
    color: darken($ruc-gold, 20%);
    font-weight: 600;
    font-size: 1.05em;
    display: block;
    margin-bottom: 8px;
  }

  p {
    margin-bottom: 0.3em;
  }
}

.reveal .warning-box {
  background: #e6f0ff;
  border-left: 4px solid $ruc-red;
  padding: 10px 12px;
  margin: 8px 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.95em;

  strong:first-child,
  b:first-child {
    color: $ruc-red;
    font-weight: 600;
    font-size: 1.05em;
    display: block;
    margin-bottom: 8px;
  }

  p {
    margin-bottom: 0.3em;
  }
}

// Code styling - Compact
.reveal pre {
  background: $code-block-bg;
  border: 1px solid $code-block-border-color;
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 0.7em;
  line-height: 1.4;
  margin: 10px 0;
}

.reveal code {
  color: $ruc-red;
  background: rgba($ruc-red, 0.1);
  padding: 1px 4px;
  border-radius: 3px;
  font-family: $font-family-monospace;
  font-size: 0.9em;
}

.reveal pre code {
  color: $text-dark;
  background: transparent;
  padding: 0;
}

// Source code blocks
.reveal div.sourceCode {
  margin: 10px 0;
}

.reveal div.sourceCode pre {
  margin: 0;
}

// Tables - Compact and professional
.reveal table {
  border-collapse: collapse;
  margin: 10px auto;
  font-size: 1.0em;
  width: 80%;
  max-width: 80%;
}

.reveal table th {
  background: $ruc-red;
  color: white;
  padding: 6px 8px;
  text-align: center;
  font-weight: 600;
  font-size: 0.95em;
}

.reveal table th p,
.reveal table th span,
.reveal table th strong,
.reveal table th em,
.reveal table th a,
.reveal table th code {
  color: inherit;
}

.reveal table th .math,
.reveal table th .katex,
.reveal table th .math .katex {
  color: white;
}

.reveal table td {
  border-bottom: 1px solid #ddd;
  padding: 4px 6px;
  text-align: center;
}

.reveal table tr:nth-child(even) {
  background: #f9f9f9;
}

.reveal table tr:hover {
  background: #f0f0f0;
}

// Large figures and diagrams
.reveal .cell-output-display {
  margin: 15px 0;
  display: flex;
  justify-content: center;
  width: 100%;
}

.reveal .cell-output-display img {
  max-width: 90%;
  max-height: 450px;
  height: auto;
}

.reveal .cell-output-display svg {
  max-width: 100%;
  height: auto;
}

// Mermaid diagrams
// 1) Hide echoed source code for Mermaid cells when a rendered diagram is present.
// 2) Let the rendered figure use the full slide width.
.reveal .cell:has(pre.mermaid),
.reveal .cell:has(svg.mermaid-js) {
  width: 100%;
}

.reveal .cell:has(pre.mermaid) > .code-copy-outer-scaffold,
.reveal .cell:has(svg.mermaid-js) > .code-copy-outer-scaffold {
  display: none !important;
}

.reveal .cell:has(pre.mermaid) > .cell-output-display,
.reveal .cell:has(svg.mermaid-js) > .cell-output-display,
.reveal .mermaid {
  width: 100% !important;
  max-width: 100% !important;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.reveal .cell-output-display pre.mermaid,
.reveal .cell-output-display svg.mermaid-js,
.reveal .mermaid pre.mermaid,
.reveal .mermaid svg.mermaid-js {
  width: 96% !important;
  max-width: 96% !important;
  height: auto !important;
  max-height: none;
  text-rendering: geometricPrecision;
  shape-rendering: geometricPrecision;
}

.reveal .cell-output-display figure,
.reveal .cell-output-display .quarto-figure,
.reveal .cell-output-display > div {
  width: 100% !important;
  max-width: 100% !important;
  margin: 0 auto;
}

.reveal .intro-mermaid {
  width: 100%;
  margin-top: 8px;
  margin-bottom: 4px;
  text-align: center;
}

.reveal .intro-mermaid svg.mermaid-js {
  width: 100% !important;
  max-width: 100% !important;
  max-height: 78vh;
  margin: 0 auto 6px auto;
}

.reveal svg.mermaid-js text,
.reveal svg.mermaid-js tspan,
.reveal svg.mermaid-js foreignObject div {
  font-family: $font-family-sans-serif !important;
  font-weight: 600;
}

.reveal svg.mermaid-js .nodeLabel,
.reveal svg.mermaid-js .edgeLabel,
.reveal svg.mermaid-js .cluster-label text,
.reveal svg.mermaid-js .messageText {
  font-size: 28px !important;
}

// Direct image styling — use max-width/max-height only (no forced width)
// so the browser can maintain aspect ratio under both constraints
.reveal p img {
  max-width: 85%;
  max-height: 65vh;
  width: auto !important;   // Override Quarto inline style="width:85%"
  height: auto !important;
  display: block;
  margin: 15px auto;
}

// Lists - Compact
.reveal ul {
  list-style-type: none;
  padding-left: 0;
  margin: 8px 0;
}

.reveal ul li {
  position: relative;
  padding-left: 20px;
  margin: 6px 0;
  font-size: 0.95em;
}

.reveal ul li::before {
  content: "▸";
  color: $ruc-red;
  position: absolute;
  left: 0;
  font-weight: bold;
}

.reveal ol {
  margin: 8px 0;
  padding-left: 25px;
}

.reveal ol li {
  margin: 6px 0;
  font-size: 0.95em;
}

// Nested lists
.reveal li > ul,
.reveal li > ol {
  margin-top: 4px;
  margin-bottom: 4px;
}

// ===== Math Formula Styling (Multiple Styles Available) =====

/**
 * USAGE GUIDE:
 * 1. Default: Just use $...$ or $$...$$
 * 2. Custom: Wrap in :::{class="math-STYLE"} for display math
 *    Examples: math-serif, math-display, math-muted, math-highlight, math-modern
 *
 * For inline math: $\text{formula}$
 * For display math in custom style:
 *   :::{.math-serif}
 *   $$formula$$
 *   :::
 */

// Base math styling
.reveal .math {
  color: $text-dark;
}

// KaTeX-specific styling for better rendering
.reveal .katex {
  font-size: 1.05em;
  vertical-align: middle;
}

.reveal .katex-display {
  margin: 0.2em 0;
  text-align: center;
}

// ===== Style 1: Modern (Default) =====
// Clean, sans-serif, contemporary
.reveal .math-modern,
.reveal .math {
  .katex {
    color: $text-dark;
  }

  .katex-display {
    font-size: 1.1em;
  }
}

// ===== Style 2: Serif (Classic) =====
// Traditional, formal appearance - good for equations
.reveal .math-serif {
  .katex {
    color: darken($text-dark, 10%);
  }

  .katex-display {
    font-size: 1.15em;
    font-weight: 500;
  }
}

// ===== Style 3: Display (Large & Clear) =====
// Larger font, emphasizing the formula
.reveal .math-display {
  .katex {
    font-size: 1.3em;
    color: $ruc-red;
    font-weight: 600;
  }

  .katex-display {
    font-size: 1.4em;
    margin: 0.3em 0;
    background: rgba($ruc-red, 0.05);
    padding: 12px 16px;
    border-left: 4px solid $ruc-red;
    border-radius: 4px;
  }
}

// ===== Style 4: Muted (Subtle) =====
// Lighter color, for supplementary equations
.reveal .math-muted {
  .katex {
    color: #888888;
    font-size: 0.95em;
  }

  .katex-display {
    opacity: 0.85;
    font-size: 1em;
  }
}

// ===== Style 5: Highlight (Emphasized) =====
// Bold with accent color, for key equations
.reveal .math-highlight {
  .katex {
    color: $ruc-red;
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: $ruc-gold;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
  }

  .katex-display {
    font-size: 1.25em;
    font-weight: 700;
    color: $ruc-red;
    background: rgba($ruc-red, 0.08);
    padding: 14px 18px;
    border: 2px solid $ruc-red;
    border-radius: 6px;
    margin: 0.3em 0;
  }
}

// ===== Style 6: Minimal (Compact) =====
// Smaller, for fitting more content
.reveal .math-minimal {
  .katex {
    font-size: 0.9em;
    color: #555555;
  }

  .katex-display {
    font-size: 0.95em;
    margin: 0.15em 0;
  }
}

// ===== Style 7: Accent (Gold theme) =====
// Using RUC gold color for variation
.reveal .math-accent {
  .katex {
    color: $ruc-gold;
    font-weight: 500;
  }

  .katex-display {
    font-size: 1.2em;
    background: rgba($ruc-gold, 0.1);
    padding: 10px 14px;
    border-left: 3px solid $ruc-gold;
    border-radius: 3px;
    margin: 0.25em 0;
  }
}

// ===== Style 8: Fancy (Stylized) =====
// With subtle shadows and styling
.reveal .math-fancy {
  .katex {
    color: $text-dark;
    font-size: 1.1em;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
  }

  .katex-display {
    font-size: 1.2em;
    background: linear-gradient(135deg, rgba($ruc-red, 0.05) 0%, rgba($ruc-gold, 0.05) 100%);
    padding: 12px 16px;
    border-radius: 6px;
    margin: 0.3em 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
  }
}

// Callouts - Compact
.reveal .callout {
  border-radius: 6px;
  margin: 12px 0;
  font-size: 0.9em;

  .callout-header {
    padding: 8px 12px;
    font-size: 0.95em;
  }

  .callout-body {
    padding: 10px 12px;
  }

  &.callout-note {
    border-left-color: $dark-blue;
    background: lighten($dark-blue, 75%);
  }

  &.callout-warning {
    border-left-color: $ruc-red;
    background: #e6f0ff;
  }

  &.callout-tip {
    border-left-color: $ruc-gold;
    background: lighten($ruc-gold, 50%);
  }
}

// Progress bar
.reveal .progress {
  background: rgba($ruc-red, 0.2);
  height: 4px;
}

.reveal .progress span {
  background: $ruc-red;
}

// Slide numbers
.reveal .slide-number {
  background: $ruc-red;
  color: white;
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 20px;
}

// Slide content area optimization
.reveal .slides {
  padding: 0 10px;
}

.reveal .slides > section {
  padding: 14px 22px;
  height: 100%;
  box-sizing: border-box;
}

// Two-column layout - tighter spacing
.reveal .columns {
  display: flex;
  gap: 18px;
  margin: 6px 0;
}

.reveal .column {
  flex: 1;
  min-width: 0; // Prevent overflow
}

// Compact text utilities
.reveal .smaller {
  font-size: 0.85em;
}

.reveal .smallest {
  font-size: 0.75em;
}

.reveal .center {
  text-align: center;
}

// Fragment animations
.reveal .fragment {
  transition: all 0.3s ease;
}

// Emphasis
.reveal strong {
  color: $ruc-red;
  font-weight: 600;
}

.reveal em {
  color: $ruc-gold;
  font-style: italic;
}

// Blockquotes
.reveal blockquote {
  border-left: 5px solid $ruc-gold;
  background: #f9f9f9;
  padding: 15px 20px;
  margin: 20px 0;
  font-style: italic;
  color: #555;
}

// Blockquotes
.reveal blockquote {
  border-left: 4px solid $ruc-gold;
  background: #f9f9f9;
  padding: 12px 16px;
  margin: 12px 0;
  font-style: italic;
  color: #555;
  font-size: 0.9em;
}

// Image styling - Larger figures, preserve aspect ratio
.reveal img {
  border-radius: 6px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  max-width: 85%;
  max-height: 65vh;
  width: auto !important;   // Override Quarto inline style="width:XX%"
  height: auto !important;  // Maintain aspect ratio
  display: block;
  margin: 15px auto;
}

// Large figure utility class
.reveal .large-figure img {
  max-width: 95%;
  max-height: 520px;
}

.reveal .full-figure img {
  max-width: 100%;
  max-height: 580px;
}

// Footer
.reveal .slide-footer {
  position: fixed;
  bottom: 20px;
  left: 20px;
  font-size: 0.6em;
  color: #999;
}

// Print styles
@media print {
  .reveal .title-slide {
    background: $ruc-red !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}

// ===== Observable JS Interactive Elements =====

// Input controls container
.reveal .observablehq-input {
  margin: 8px 0;

  label {
    font-size: 0.9em;
    color: $text-dark;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: linear-gradient(to right, lighten($ruc-red, 40%), $ruc-red);
    border-radius: 3px;
    outline: none;
    margin: 8px 0;

    &::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 18px;
      height: 18px;
      background: $ruc-red;
      border-radius: 50%;
      cursor: pointer;
      box-shadow: 0 2px 4px rgba(0,0,0,0.2);
      transition: transform 0.1s;

      &:hover {
        transform: scale(1.1);
      }
    }

    &::-moz-range-thumb {
      width: 18px;
      height: 18px;
      background: $ruc-red;
      border-radius: 50%;
      cursor: pointer;
      border: none;
      box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }
  }
}

// Observable outputs
.reveal .observablehq-output {
  font-size: 0.95em;

  table {
    font-size: 0.9em;
    margin: 10px 0;

    td, th {
      padding: 6px 10px;
    }
  }
}

// Plot styling for Observable Plot
.reveal .observablehq svg {
  max-width: 100%;
  height: auto;
}

// Code output styling
.reveal .cell-output {
  margin: 10px 0;
  font-size: 0.85em;

  pre {
    background: #f8f8f8;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 10px;
    margin: 8px 0;
    max-height: 300px;
    overflow-y: auto;
  }
}

// Jupyter-style output
.reveal .cell-output-display {
  margin: 10px 0;
  text-align: center;

  img {
    max-width: 95%;
    max-height: 400px;
  }
}

// Code cell styling
.reveal .cell {
  margin: 8px 0;
}

.reveal .cell-code {
  font-size: 0.75em;

  pre {
    margin: 0;
    padding: 10px 12px;
  }
}

// Line numbers in code
.reveal .code-line-number {
  color: #999;
  font-size: 0.8em;
  margin-right: 10px;
  user-select: none;
}

// Highlight code blocks with output
.reveal div.sourceCode + div.cell-output,
.reveal div.sourceCode + .cell-output-display {
  margin-top: -5px;
  border-top: none;
  border-radius: 0 0 6px 6px;
}

// Compact code for slides
.reveal .smaller .sourceCode,
.reveal .smaller pre {
  font-size: 0.72em;
}

// Vibe coding highlight
.reveal .vibe-code {
  background: linear-gradient(135deg, rgba(139, 111, 78, 0.1) 0%, rgba(174, 11, 42, 0.05) 100%);
  border-left: 4px solid $ruc-gold;
  padding: 12px 16px;
  margin: 10px 0;
  border-radius: 0 6px 6px 0;

  .prompt-text {
    font-style: italic;
    color: #666;
    border-left: 3px solid $ruc-gold;
    padding-left: 12px;
    margin-bottom: 12px;
  }
}

// Interactive panel styling
.reveal .interactive-panel {
  background: #fafafa;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 15px 20px;
  margin: 15px 0;

  .panel-title {
    font-weight: 600;
    color: $ruc-red;
    margin-bottom: 12px;
    font-size: 1.05em;
  }
}

// Slider container
.reveal .slider-container {
  display: flex;
  align-items: center;
  gap: 15px;
  margin: 10px 0;
  padding: 8px 12px;
  background: #f5f5f5;
  border-radius: 6px;

  label {
    min-width: 150px;
    font-size: 0.9em;
    font-weight: 500;
  }

  input[type="range"] {
    flex: 1;
  }

  .value-display {
    min-width: 60px;
    text-align: right;
    font-weight: 600;
    color: $ruc-red;
  }
}

// ===== Animation Control Panel Styles =====

// Observable JS input controls styling
.reveal .observablehq-input {
  margin: 8px 0;
  padding: 6px 10px;
  background: linear-gradient(135deg, #fafafa 0%, #f0f0f0 100%);
  border-radius: 6px;
  border: 1px solid #e0e0e0;

  label {
    font-size: 0.88em;
    color: $text-dark;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
  }

  // Range slider styling
  input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    background: linear-gradient(to right, lighten($ruc-red, 50%), $ruc-red);
    border-radius: 4px;
    outline: none;
    margin: 6px 0;

    &::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 20px;
      height: 20px;
      background: $ruc-red;
      border-radius: 50%;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(174, 11, 42, 0.4);
      transition: all 0.2s ease;
      border: 2px solid white;

      &:hover {
        transform: scale(1.15);
        box-shadow: 0 3px 8px rgba(174, 11, 42, 0.5);
      }
    }

    &::-moz-range-thumb {
      width: 20px;
      height: 20px;
      background: $ruc-red;
      border-radius: 50%;
      cursor: pointer;
      border: 2px solid white;
      box-shadow: 0 2px 6px rgba(174, 11, 42, 0.4);
    }
  }

  // Button styling for animation controls
  button {
    background: linear-gradient(135deg, $ruc-red 0%, darken($ruc-red, 10%) 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(174, 11, 42, 0.3);
    margin: 8px 0;

    &:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 8px rgba(174, 11, 42, 0.4);
    }

    &:active {
      transform: translateY(0);
      box-shadow: 0 2px 4px rgba(174, 11, 42, 0.3);
    }
  }
}

// Stats table in interactive panels
.reveal .observablehq-output {
  font-size: 0.9em;

  table {
    font-size: 0.88em;
    margin: 10px 0;
    width: 100%;

    td, th {
      padding: 5px 8px;
      text-align: center;
    }

    th {
      background: $dark-blue;
      color: white;
      font-weight: 600;
    }

    th p,
    th span,
    th strong,
    th em,
    th a,
    th code {
      color: inherit;
    }

    tr:nth-child(even) {
      background: #f8f8f8;
    }
  }
}

// D3.js visualization container
.reveal .observablehq svg {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

// Animation highlight effect
.reveal .animating {
  animation: pulse-highlight 0.5s ease;
}

@keyframes pulse-highlight {
  0% { background-color: rgba(174, 11, 42, 0.1); }
  50% { background-color: rgba(174, 11, 42, 0.2); }
  100% { background-color: transparent; }
}

// Parameter control panel
.reveal .param-panel {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-left: 4px solid $ruc-red;
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 10px 0;

  .panel-header {
    font-weight: 600;
    color: $ruc-red;
    margin-bottom: 10px;
    font-size: 0.95em;
    display: flex;
    align-items: center;
    gap: 8px;
  }
}